1 /*-
2 * Copyright (c) 2004-2013 Tim Kientzle
3 * Copyright (c) 2011-2012,2014 Michihiro NAKAJIMA
4 * Copyright (c) 2013 Konrad Kleine
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "archive_platform.h"
29 __FBSDID("$FreeBSD: head/lib/libarchive/archive_read_support_format_zip.c 201102 2009-12-28 03:11:36Z kientzle $");
30
31 /*
32 * The definitive documentation of the Zip file format is:
33 * http://www.pkware.com/documents/casestudies/APPNOTE.TXT
34 *
35 * The Info-Zip project has pioneered various extensions to better
36 * support Zip on Unix, including the 0x5455 "UT", 0x5855 "UX", 0x7855
37 * "Ux", and 0x7875 "ux" extensions for time and ownership
38 * information.
39 *
40 * History of this code: The streaming Zip reader was first added to
41 * libarchive in January 2005. Support for seekable input sources was
42 * added in Nov 2011. Zip64 support (including a significant code
43 * refactoring) was added in 2014.
44 */
45
46 #ifdef HAVE_ERRNO_H
47 #include <errno.h>
48 #endif
49 #ifdef HAVE_STDLIB_H
50 #include <stdlib.h>
51 #endif
52 #ifdef HAVE_ZLIB_H
53 #include <zlib.h>
54 #endif
55 #ifdef HAVE_BZLIB_H
56 #include <bzlib.h>
57 #endif
58 #ifdef HAVE_LZMA_H
59 #include <lzma.h>
60 #endif
61
62 #include "archive.h"
63 #include "archive_digest_private.h"
64 #include "archive_cryptor_private.h"
65 #include "archive_endian.h"
66 #include "archive_entry.h"
67 #include "archive_entry_locale.h"
68 #include "archive_hmac_private.h"
69 #include "archive_private.h"
70 #include "archive_rb.h"
71 #include "archive_read_private.h"
72 #include "archive_ppmd8_private.h"
73
74 #ifndef HAVE_ZLIB_H
75 #include "archive_crc32.h"
76 #endif
77
78 struct zip_entry {
79 struct archive_rb_node node;
80 struct zip_entry *next;
81 int64_t local_header_offset;
82 int64_t compressed_size;
83 int64_t uncompressed_size;
84 int64_t gid;
85 int64_t uid;
86 struct archive_string rsrcname;
87 time_t mtime;
88 time_t atime;
89 time_t ctime;
90 uint32_t crc32;
91 uint16_t mode;
92 uint16_t zip_flags; /* From GP Flags Field */
93 unsigned char compression;
94 unsigned char system; /* From "version written by" */
95 unsigned char flags; /* Our extra markers. */
96 unsigned char decdat;/* Used for Decryption check */
97
98 /* WinZip AES encryption extra field should be available
99 * when compression is 99. */
100 struct {
101 /* Vendor version: AE-1 - 0x0001, AE-2 - 0x0002 */
102 unsigned vendor;
103 #define AES_VENDOR_AE_1 0x0001
104 #define AES_VENDOR_AE_2 0x0002
105 /* AES encryption strength:
106 * 1 - 128 bits, 2 - 192 bits, 2 - 256 bits. */
107 unsigned strength;
108 /* Actual compression method. */
109 unsigned char compression;
110 } aes_extra;
111 };
112
113 struct trad_enc_ctx {
114 uint32_t keys[3];
115 };
116
117 /* Bits used in zip_flags. */
118 #define ZIP_ENCRYPTED (1 << 0)
119 #define ZIP_LENGTH_AT_END (1 << 3)
120 #define ZIP_STRONG_ENCRYPTED (1 << 6)
121 #define ZIP_UTF8_NAME (1 << 11)
122 /* See "7.2 Single Password Symmetric Encryption Method"
123 in http://www.pkware.com/documents/casestudies/APPNOTE.TXT */
124 #define ZIP_CENTRAL_DIRECTORY_ENCRYPTED (1 << 13)
125
126 /* Bits used in flags. */
127 #define LA_USED_ZIP64 (1 << 0)
128 #define LA_FROM_CENTRAL_DIRECTORY (1 << 1)
129
130 /*
131 * See "WinZip - AES Encryption Information"
132 * http://www.winzip.com/aes_info.htm
133 */
134 /* Value used in compression method. */
135 #define WINZIP_AES_ENCRYPTION 99
136 /* Authentication code size. */
137 #define AUTH_CODE_SIZE 10
138 /**/
139 #define MAX_DERIVED_KEY_BUF_SIZE (AES_MAX_KEY_SIZE * 2 + 2)
140
141 struct zip {
142 /* Structural information about the archive. */
143 struct archive_string format_name;
144 int64_t central_directory_offset;
145 int64_t central_directory_offset_adjusted;
146 size_t central_directory_entries_total;
147 size_t central_directory_entries_on_this_disk;
148 int has_encrypted_entries;
149
150 /* List of entries (seekable Zip only) */
151 struct zip_entry *zip_entries;
152 struct archive_rb_tree tree;
153 struct archive_rb_tree tree_rsrc;
154
155 /* Bytes read but not yet consumed via __archive_read_consume() */
156 size_t unconsumed;
157
158 /* Information about entry we're currently reading. */
159 struct zip_entry *entry;
160 int64_t entry_bytes_remaining;
161
162 /* These count the number of bytes actually read for the entry. */
163 int64_t entry_compressed_bytes_read;
164 int64_t entry_uncompressed_bytes_read;
165
166 /* Running CRC32 of the decompressed data */
167 unsigned long entry_crc32;
168 unsigned long (*crc32func)(unsigned long, const void *,
169 size_t);
170 char ignore_crc32;
171
172 /* Flags to mark progress of decompression. */
173 char decompress_init;
174 char end_of_entry;
175
176 unsigned char *uncompressed_buffer;
177 size_t uncompressed_buffer_size;
178
179 #ifdef HAVE_ZLIB_H
180 z_stream stream;
181 char stream_valid;
182 #endif
183
184 #if HAVE_LZMA_H && HAVE_LIBLZMA
185 lzma_stream zipx_lzma_stream;
186 char zipx_lzma_valid;
187 #endif
188
189 #ifdef HAVE_BZLIB_H
190 bz_stream bzstream;
191 char bzstream_valid;
192 #endif
193
194 IByteIn zipx_ppmd_stream;
195 ssize_t zipx_ppmd_read_compressed;
196 CPpmd8 ppmd8;
197 char ppmd8_valid;
198 char ppmd8_stream_failed;
199
200 struct archive_string_conv *sconv;
201 struct archive_string_conv *sconv_default;
202 struct archive_string_conv *sconv_utf8;
203 int init_default_conversion;
204 int process_mac_extensions;
205
206 char init_decryption;
207
208 /* Decryption buffer. */
209 /*
210 * The decrypted data starts at decrypted_ptr and
211 * extends for decrypted_bytes_remaining. Decryption
212 * adds new data to the end of this block, data is returned
213 * to clients from the beginning. When the block hits the
214 * end of decrypted_buffer, it has to be shuffled back to
215 * the beginning of the buffer.
216 */
217 unsigned char *decrypted_buffer;
218 unsigned char *decrypted_ptr;
219 size_t decrypted_buffer_size;
220 size_t decrypted_bytes_remaining;
221 size_t decrypted_unconsumed_bytes;
222
223 /* Traditional PKWARE decryption. */
224 struct trad_enc_ctx tctx;
225 char tctx_valid;
226
227 /* WinZip AES decryption. */
228 /* Contexts used for AES decryption. */
229 archive_crypto_ctx cctx;
230 char cctx_valid;
231 archive_hmac_sha1_ctx hctx;
232 char hctx_valid;
233
234 /* Strong encryption's decryption header information. */
235 unsigned iv_size;
236 unsigned alg_id;
237 unsigned bit_len;
238 unsigned flags;
239 unsigned erd_size;
240 unsigned v_size;
241 unsigned v_crc32;
242 uint8_t *iv;
243 uint8_t *erd;
244 uint8_t *v_data;
245 };
246
247 /* Many systems define min or MIN, but not all. */
248 #define zipmin(a,b) ((a) < (b) ? (a) : (b))
249
250 #ifdef HAVE_ZLIB_H
251 static int
252 zip_read_data_deflate(struct archive_read *a, const void **buff,
253 size_t *size, int64_t *offset);
254 #endif
255 #if HAVE_LZMA_H && HAVE_LIBLZMA
256 static int
257 zip_read_data_zipx_lzma_alone(struct archive_read *a, const void **buff,
258 size_t *size, int64_t *offset);
259 #endif
260
261 /* This function is used by Ppmd8_DecodeSymbol during decompression of Ppmd8
262 * streams inside ZIP files. It has 2 purposes: one is to fetch the next
263 * compressed byte from the stream, second one is to increase the counter how
264 * many compressed bytes were read. */
265 static Byte
ppmd_read(void * p)266 ppmd_read(void* p) {
267 /* Get the handle to current decompression context. */
268 struct archive_read *a = ((IByteIn*)p)->a;
269 struct zip *zip = (struct zip*) a->format->data;
270 ssize_t bytes_avail = 0;
271
272 /* Fetch next byte. */
273 const uint8_t* data = __archive_read_ahead(a, 1, &bytes_avail);
274 if(bytes_avail < 1) {
275 zip->ppmd8_stream_failed = 1;
276 return 0;
277 }
278
279 __archive_read_consume(a, 1);
280
281 /* Increment the counter. */
282 ++zip->zipx_ppmd_read_compressed;
283
284 /* Return the next compressed byte. */
285 return data[0];
286 }
287
288 /* ------------------------------------------------------------------------ */
289
290 /*
291 Traditional PKWARE Decryption functions.
292 */
293
294 static void
trad_enc_update_keys(struct trad_enc_ctx * ctx,uint8_t c)295 trad_enc_update_keys(struct trad_enc_ctx *ctx, uint8_t c)
296 {
297 uint8_t t;
298 #define CRC32(c, b) (crc32(c ^ 0xffffffffUL, &b, 1) ^ 0xffffffffUL)
299
300 ctx->keys[0] = CRC32(ctx->keys[0], c);
301 ctx->keys[1] = (ctx->keys[1] + (ctx->keys[0] & 0xff)) * 134775813L + 1;
302 t = (ctx->keys[1] >> 24) & 0xff;
303 ctx->keys[2] = CRC32(ctx->keys[2], t);
304 #undef CRC32
305 }
306
307 static uint8_t
trad_enc_decrypt_byte(struct trad_enc_ctx * ctx)308 trad_enc_decrypt_byte(struct trad_enc_ctx *ctx)
309 {
310 unsigned temp = ctx->keys[2] | 2;
311 return (uint8_t)((temp * (temp ^ 1)) >> 8) & 0xff;
312 }
313
314 static void
trad_enc_decrypt_update(struct trad_enc_ctx * ctx,const uint8_t * in,size_t in_len,uint8_t * out,size_t out_len)315 trad_enc_decrypt_update(struct trad_enc_ctx *ctx, const uint8_t *in,
316 size_t in_len, uint8_t *out, size_t out_len)
317 {
318 unsigned i, max;
319
320 max = (unsigned)((in_len < out_len)? in_len: out_len);
321
322 for (i = 0; i < max; i++) {
323 uint8_t t = in[i] ^ trad_enc_decrypt_byte(ctx);
324 out[i] = t;
325 trad_enc_update_keys(ctx, t);
326 }
327 }
328
329 static int
trad_enc_init(struct trad_enc_ctx * ctx,const char * pw,size_t pw_len,const uint8_t * key,size_t key_len,uint8_t * crcchk)330 trad_enc_init(struct trad_enc_ctx *ctx, const char *pw, size_t pw_len,
331 const uint8_t *key, size_t key_len, uint8_t *crcchk)
332 {
333 uint8_t header[12];
334
335 if (key_len < 12) {
336 *crcchk = 0xff;
337 return -1;
338 }
339
340 ctx->keys[0] = 305419896L;
341 ctx->keys[1] = 591751049L;
342 ctx->keys[2] = 878082192L;
343
344 for (;pw_len; --pw_len)
345 trad_enc_update_keys(ctx, *pw++);
346
347 trad_enc_decrypt_update(ctx, key, 12, header, 12);
348 /* Return the last byte for CRC check. */
349 *crcchk = header[11];
350 return 0;
351 }
352
353 #if 0
354 static void
355 crypt_derive_key_sha1(const void *p, int size, unsigned char *key,
356 int key_size)
357 {
358 #define MD_SIZE 20
359 archive_sha1_ctx ctx;
360 unsigned char md1[MD_SIZE];
361 unsigned char md2[MD_SIZE * 2];
362 unsigned char mkb[64];
363 int i;
364
365 archive_sha1_init(&ctx);
366 archive_sha1_update(&ctx, p, size);
367 archive_sha1_final(&ctx, md1);
368
369 memset(mkb, 0x36, sizeof(mkb));
370 for (i = 0; i < MD_SIZE; i++)
371 mkb[i] ^= md1[i];
372 archive_sha1_init(&ctx);
373 archive_sha1_update(&ctx, mkb, sizeof(mkb));
374 archive_sha1_final(&ctx, md2);
375
376 memset(mkb, 0x5C, sizeof(mkb));
377 for (i = 0; i < MD_SIZE; i++)
378 mkb[i] ^= md1[i];
379 archive_sha1_init(&ctx);
380 archive_sha1_update(&ctx, mkb, sizeof(mkb));
381 archive_sha1_final(&ctx, md2 + MD_SIZE);
382
383 if (key_size > 32)
384 key_size = 32;
385 memcpy(key, md2, key_size);
386 #undef MD_SIZE
387 }
388 #endif
389
390 /*
391 * Common code for streaming or seeking modes.
392 *
393 * Includes code to read local file headers, decompress data
394 * from entry bodies, and common API.
395 */
396
397 static unsigned long
real_crc32(unsigned long crc,const void * buff,size_t len)398 real_crc32(unsigned long crc, const void *buff, size_t len)
399 {
400 return crc32(crc, buff, (unsigned int)len);
401 }
402
403 /* Used by "ignorecrc32" option to speed up tests. */
404 static unsigned long
fake_crc32(unsigned long crc,const void * buff,size_t len)405 fake_crc32(unsigned long crc, const void *buff, size_t len)
406 {
407 (void)crc; /* UNUSED */
408 (void)buff; /* UNUSED */
409 (void)len; /* UNUSED */
410 return 0;
411 }
412
413 static const struct {
414 int id;
415 const char * name;
416 } compression_methods[] = {
417 {0, "uncompressed"}, /* The file is stored (no compression) */
418 {1, "shrinking"}, /* The file is Shrunk */
419 {2, "reduced-1"}, /* The file is Reduced with compression factor 1 */
420 {3, "reduced-2"}, /* The file is Reduced with compression factor 2 */
421 {4, "reduced-3"}, /* The file is Reduced with compression factor 3 */
422 {5, "reduced-4"}, /* The file is Reduced with compression factor 4 */
423 {6, "imploded"}, /* The file is Imploded */
424 {7, "reserved"}, /* Reserved for Tokenizing compression algorithm */
425 {8, "deflation"}, /* The file is Deflated */
426 {9, "deflation-64-bit"}, /* Enhanced Deflating using Deflate64(tm) */
427 {10, "ibm-terse"},/* PKWARE Data Compression Library Imploding
428 * (old IBM TERSE) */
429 {11, "reserved"}, /* Reserved by PKWARE */
430 {12, "bzip"}, /* File is compressed using BZIP2 algorithm */
431 {13, "reserved"}, /* Reserved by PKWARE */
432 {14, "lzma"}, /* LZMA (EFS) */
433 {15, "reserved"}, /* Reserved by PKWARE */
434 {16, "reserved"}, /* Reserved by PKWARE */
435 {17, "reserved"}, /* Reserved by PKWARE */
436 {18, "ibm-terse-new"}, /* File is compressed using IBM TERSE (new) */
437 {19, "ibm-lz777"},/* IBM LZ77 z Architecture (PFS) */
438 {95, "xz"}, /* XZ compressed data */
439 {96, "jpeg"}, /* JPEG compressed data */
440 {97, "wav-pack"}, /* WavPack compressed data */
441 {98, "ppmd-1"}, /* PPMd version I, Rev 1 */
442 {99, "aes"} /* WinZip AES encryption */
443 };
444
445 static const char *
compression_name(const int compression)446 compression_name(const int compression)
447 {
448 static const int num_compression_methods =
449 sizeof(compression_methods)/sizeof(compression_methods[0]);
450 int i=0;
451
452 while(compression >= 0 && i < num_compression_methods) {
453 if (compression_methods[i].id == compression)
454 return compression_methods[i].name;
455 i++;
456 }
457 return "??";
458 }
459
460 /* Convert an MSDOS-style date/time into Unix-style time. */
461 static time_t
zip_time(const char * p)462 zip_time(const char *p)
463 {
464 int msTime, msDate;
465 struct tm ts;
466
467 msTime = (0xff & (unsigned)p[0]) + 256 * (0xff & (unsigned)p[1]);
468 msDate = (0xff & (unsigned)p[2]) + 256 * (0xff & (unsigned)p[3]);
469
470 memset(&ts, 0, sizeof(ts));
471 ts.tm_year = ((msDate >> 9) & 0x7f) + 80; /* Years since 1900. */
472 ts.tm_mon = ((msDate >> 5) & 0x0f) - 1; /* Month number. */
473 ts.tm_mday = msDate & 0x1f; /* Day of month. */
474 ts.tm_hour = (msTime >> 11) & 0x1f;
475 ts.tm_min = (msTime >> 5) & 0x3f;
476 ts.tm_sec = (msTime << 1) & 0x3e;
477 ts.tm_isdst = -1;
478 return mktime(&ts);
479 }
480
481 /*
482 * The extra data is stored as a list of
483 * id1+size1+data1 + id2+size2+data2 ...
484 * triplets. id and size are 2 bytes each.
485 */
486 static int
process_extra(struct archive_read * a,struct archive_entry * entry,const char * p,size_t extra_length,struct zip_entry * zip_entry)487 process_extra(struct archive_read *a, struct archive_entry *entry,
488 const char *p, size_t extra_length, struct zip_entry* zip_entry)
489 {
490 unsigned offset = 0;
491 struct zip *zip = (struct zip *)(a->format->data);
492
493 if (extra_length == 0) {
494 return ARCHIVE_OK;
495 }
496
497 if (extra_length < 4) {
498 size_t i = 0;
499 /* Some ZIP files may have trailing 0 bytes. Let's check they
500 * are all 0 and ignore them instead of returning an error.
501 *
502 * This is not technically correct, but some ZIP files look
503 * like this and other tools support those files - so let's
504 * also support them.
505 */
506 for (; i < extra_length; i++) {
507 if (p[i] != 0) {
508 archive_set_error(&a->archive,
509 ARCHIVE_ERRNO_FILE_FORMAT,
510 "Too-small extra data: "
511 "Need at least 4 bytes, "
512 "but only found %d bytes",
513 (int)extra_length);
514 return ARCHIVE_FAILED;
515 }
516 }
517
518 return ARCHIVE_OK;
519 }
520
521 while (offset <= extra_length - 4) {
522 unsigned short headerid = archive_le16dec(p + offset);
523 unsigned short datasize = archive_le16dec(p + offset + 2);
524
525 offset += 4;
526 if (offset + datasize > extra_length) {
527 archive_set_error(&a->archive,
528 ARCHIVE_ERRNO_FILE_FORMAT, "Extra data overflow: "
529 "Need %d bytes but only found %d bytes",
530 (int)datasize, (int)(extra_length - offset));
531 return ARCHIVE_FAILED;
532 }
533 #ifdef DEBUG
534 fprintf(stderr, "Header id 0x%04x, length %d\n",
535 headerid, datasize);
536 #endif
537 switch (headerid) {
538 case 0x0001:
539 /* Zip64 extended information extra field. */
540 zip_entry->flags |= LA_USED_ZIP64;
541 if (zip_entry->uncompressed_size == 0xffffffff) {
542 uint64_t t = 0;
543 if (datasize < 8
544 || (t = archive_le64dec(p + offset)) >
545 INT64_MAX) {
546 archive_set_error(&a->archive,
547 ARCHIVE_ERRNO_FILE_FORMAT,
548 "Malformed 64-bit "
549 "uncompressed size");
550 return ARCHIVE_FAILED;
551 }
552 zip_entry->uncompressed_size = t;
553 offset += 8;
554 datasize -= 8;
555 }
556 if (zip_entry->compressed_size == 0xffffffff) {
557 uint64_t t = 0;
558 if (datasize < 8
559 || (t = archive_le64dec(p + offset)) >
560 INT64_MAX) {
561 archive_set_error(&a->archive,
562 ARCHIVE_ERRNO_FILE_FORMAT,
563 "Malformed 64-bit "
564 "compressed size");
565 return ARCHIVE_FAILED;
566 }
567 zip_entry->compressed_size = t;
568 offset += 8;
569 datasize -= 8;
570 }
571 if (zip_entry->local_header_offset == 0xffffffff) {
572 uint64_t t = 0;
573 if (datasize < 8
574 || (t = archive_le64dec(p + offset)) >
575 INT64_MAX) {
576 archive_set_error(&a->archive,
577 ARCHIVE_ERRNO_FILE_FORMAT,
578 "Malformed 64-bit "
579 "local header offset");
580 return ARCHIVE_FAILED;
581 }
582 zip_entry->local_header_offset = t;
583 offset += 8;
584 datasize -= 8;
585 }
586 /* archive_le32dec(p + offset) gives disk
587 * on which file starts, but we don't handle
588 * multi-volume Zip files. */
589 break;
590 #ifdef DEBUG
591 case 0x0017:
592 {
593 /* Strong encryption field. */
594 if (archive_le16dec(p + offset) == 2) {
595 unsigned algId =
596 archive_le16dec(p + offset + 2);
597 unsigned bitLen =
598 archive_le16dec(p + offset + 4);
599 int flags =
600 archive_le16dec(p + offset + 6);
601 fprintf(stderr, "algId=0x%04x, bitLen=%u, "
602 "flgas=%d\n", algId, bitLen,flags);
603 }
604 break;
605 }
606 #endif
607 case 0x5455:
608 {
609 /* Extended time field "UT". */
610 int flags;
611 if (datasize == 0) {
612 archive_set_error(&a->archive,
613 ARCHIVE_ERRNO_FILE_FORMAT,
614 "Incomplete extended time field");
615 return ARCHIVE_FAILED;
616 }
617 flags = p[offset];
618 offset++;
619 datasize--;
620 /* Flag bits indicate which dates are present. */
621 if (flags & 0x01)
622 {
623 #ifdef DEBUG
624 fprintf(stderr, "mtime: %lld -> %d\n",
625 (long long)zip_entry->mtime,
626 archive_le32dec(p + offset));
627 #endif
628 if (datasize < 4)
629 break;
630 zip_entry->mtime = archive_le32dec(p + offset);
631 offset += 4;
632 datasize -= 4;
633 }
634 if (flags & 0x02)
635 {
636 if (datasize < 4)
637 break;
638 zip_entry->atime = archive_le32dec(p + offset);
639 offset += 4;
640 datasize -= 4;
641 }
642 if (flags & 0x04)
643 {
644 if (datasize < 4)
645 break;
646 zip_entry->ctime = archive_le32dec(p + offset);
647 offset += 4;
648 datasize -= 4;
649 }
650 break;
651 }
652 case 0x5855:
653 {
654 /* Info-ZIP Unix Extra Field (old version) "UX". */
655 if (datasize >= 8) {
656 zip_entry->atime = archive_le32dec(p + offset);
657 zip_entry->mtime =
658 archive_le32dec(p + offset + 4);
659 }
660 if (datasize >= 12) {
661 zip_entry->uid =
662 archive_le16dec(p + offset + 8);
663 zip_entry->gid =
664 archive_le16dec(p + offset + 10);
665 }
666 break;
667 }
668 case 0x6c78:
669 {
670 /* Experimental 'xl' field */
671 /*
672 * Introduced Dec 2013 to provide a way to
673 * include external file attributes (and other
674 * fields that ordinarily appear only in
675 * central directory) in local file header.
676 * This provides file type and permission
677 * information necessary to support full
678 * streaming extraction. Currently being
679 * discussed with other Zip developers
680 * ... subject to change.
681 *
682 * Format:
683 * The field starts with a bitmap that specifies
684 * which additional fields are included. The
685 * bitmap is variable length and can be extended in
686 * the future.
687 *
688 * n bytes - feature bitmap: first byte has low-order
689 * 7 bits. If high-order bit is set, a subsequent
690 * byte holds the next 7 bits, etc.
691 *
692 * if bitmap & 1, 2 byte "version made by"
693 * if bitmap & 2, 2 byte "internal file attributes"
694 * if bitmap & 4, 4 byte "external file attributes"
695 * if bitmap & 8, 2 byte comment length + n byte
696 * comment
697 */
698 int bitmap, bitmap_last;
699
700 if (datasize < 1)
701 break;
702 bitmap_last = bitmap = 0xff & p[offset];
703 offset += 1;
704 datasize -= 1;
705
706 /* We only support first 7 bits of bitmap; skip rest. */
707 while ((bitmap_last & 0x80) != 0
708 && datasize >= 1) {
709 bitmap_last = p[offset];
710 offset += 1;
711 datasize -= 1;
712 }
713
714 if (bitmap & 1) {
715 /* 2 byte "version made by" */
716 if (datasize < 2)
717 break;
718 zip_entry->system
719 = archive_le16dec(p + offset) >> 8;
720 offset += 2;
721 datasize -= 2;
722 }
723 if (bitmap & 2) {
724 /* 2 byte "internal file attributes" */
725 uint32_t internal_attributes;
726 if (datasize < 2)
727 break;
728 internal_attributes
729 = archive_le16dec(p + offset);
730 /* Not used by libarchive at present. */
731 (void)internal_attributes; /* UNUSED */
732 offset += 2;
733 datasize -= 2;
734 }
735 if (bitmap & 4) {
736 /* 4 byte "external file attributes" */
737 uint32_t external_attributes;
738 if (datasize < 4)
739 break;
740 external_attributes
741 = archive_le32dec(p + offset);
742 if (zip_entry->system == 3) {
743 zip_entry->mode
744 = external_attributes >> 16;
745 } else if (zip_entry->system == 0) {
746 // Interpret MSDOS directory bit
747 if (0x10 == (external_attributes &
748 0x10)) {
749 zip_entry->mode =
750 AE_IFDIR | 0775;
751 } else {
752 zip_entry->mode =
753 AE_IFREG | 0664;
754 }
755 if (0x01 == (external_attributes &
756 0x01)) {
757 /* Read-only bit;
758 * strip write permissions */
759 zip_entry->mode &= 0555;
760 }
761 } else {
762 zip_entry->mode = 0;
763 }
764 offset += 4;
765 datasize -= 4;
766 }
767 if (bitmap & 8) {
768 /* 2 byte comment length + comment */
769 uint32_t comment_length;
770 if (datasize < 2)
771 break;
772 comment_length
773 = archive_le16dec(p + offset);
774 offset += 2;
775 datasize -= 2;
776
777 if (datasize < comment_length)
778 break;
779 /* Comment is not supported by libarchive */
780 offset += comment_length;
781 datasize -= comment_length;
782 }
783 break;
784 }
785 case 0x7075:
786 {
787 /* Info-ZIP Unicode Path Extra Field. */
788 if (datasize < 5 || entry == NULL)
789 break;
790 offset += 5;
791 datasize -= 5;
792
793 /* The path name in this field is always encoded
794 * in UTF-8. */
795 if (zip->sconv_utf8 == NULL) {
796 zip->sconv_utf8 =
797 archive_string_conversion_from_charset(
798 &a->archive, "UTF-8", 1);
799 /* If the converter from UTF-8 is not
800 * available, then the path name from the main
801 * field will more likely be correct. */
802 if (zip->sconv_utf8 == NULL)
803 break;
804 }
805
806 /* Make sure the CRC32 of the filename matches. */
807 if (!zip->ignore_crc32) {
808 const char *cp = archive_entry_pathname(entry);
809 if (cp) {
810 unsigned long file_crc =
811 zip->crc32func(0, cp, strlen(cp));
812 unsigned long utf_crc =
813 archive_le32dec(p + offset - 4);
814 if (file_crc != utf_crc) {
815 #ifdef DEBUG
816 fprintf(stderr,
817 "CRC filename mismatch; "
818 "CDE is %lx, but UTF8 "
819 "is outdated with %lx\n",
820 file_crc, utf_crc);
821 #endif
822 break;
823 }
824 }
825 }
826
827 if (archive_entry_copy_pathname_l(entry,
828 p + offset, datasize, zip->sconv_utf8) != 0) {
829 /* Ignore the error, and fallback to the path
830 * name from the main field. */
831 #ifdef DEBUG
832 fprintf(stderr, "Failed to read the ZIP "
833 "0x7075 extra field path.\n");
834 #endif
835 }
836 break;
837 }
838 case 0x7855:
839 /* Info-ZIP Unix Extra Field (type 2) "Ux". */
840 #ifdef DEBUG
841 fprintf(stderr, "uid %d gid %d\n",
842 archive_le16dec(p + offset),
843 archive_le16dec(p + offset + 2));
844 #endif
845 if (datasize >= 2)
846 zip_entry->uid = archive_le16dec(p + offset);
847 if (datasize >= 4)
848 zip_entry->gid =
849 archive_le16dec(p + offset + 2);
850 break;
851 case 0x7875:
852 {
853 /* Info-Zip Unix Extra Field (type 3) "ux". */
854 int uidsize = 0, gidsize = 0;
855
856 /* TODO: support arbitrary uidsize/gidsize. */
857 if (datasize >= 1 && p[offset] == 1) {/* version=1 */
858 if (datasize >= 4) {
859 /* get a uid size. */
860 uidsize = 0xff & (int)p[offset+1];
861 if (uidsize == 2)
862 zip_entry->uid =
863 archive_le16dec(
864 p + offset + 2);
865 else if (uidsize == 4 && datasize >= 6)
866 zip_entry->uid =
867 archive_le32dec(
868 p + offset + 2);
869 }
870 if (datasize >= (2 + uidsize + 3)) {
871 /* get a gid size. */
872 gidsize = 0xff &
873 (int)p[offset+2+uidsize];
874 if (gidsize == 2)
875 zip_entry->gid =
876 archive_le16dec(
877 p+offset+2+uidsize+1);
878 else if (gidsize == 4 &&
879 datasize >= (2 + uidsize + 5))
880 zip_entry->gid =
881 archive_le32dec(
882 p+offset+2+uidsize+1);
883 }
884 }
885 break;
886 }
887 case 0x9901:
888 /* WinZip AES extra data field. */
889 if (datasize < 6) {
890 archive_set_error(&a->archive,
891 ARCHIVE_ERRNO_FILE_FORMAT,
892 "Incomplete AES field");
893 return ARCHIVE_FAILED;
894 }
895 if (p[offset + 2] == 'A' && p[offset + 3] == 'E') {
896 /* Vendor version. */
897 zip_entry->aes_extra.vendor =
898 archive_le16dec(p + offset);
899 /* AES encryption strength. */
900 zip_entry->aes_extra.strength = p[offset + 4];
901 /* Actual compression method. */
902 zip_entry->aes_extra.compression =
903 p[offset + 5];
904 }
905 break;
906 default:
907 break;
908 }
909 offset += datasize;
910 }
911 return ARCHIVE_OK;
912 }
913
914 /*
915 * Assumes file pointer is at beginning of local file header.
916 */
917 static int
zip_read_local_file_header(struct archive_read * a,struct archive_entry * entry,struct zip * zip)918 zip_read_local_file_header(struct archive_read *a, struct archive_entry *entry,
919 struct zip *zip)
920 {
921 const char *p;
922 const void *h;
923 const wchar_t *wp;
924 const char *cp;
925 size_t len, filename_length, extra_length;
926 struct archive_string_conv *sconv;
927 struct zip_entry *zip_entry = zip->entry;
928 struct zip_entry zip_entry_central_dir;
929 int ret = ARCHIVE_OK;
930 char version;
931
932 /* Save a copy of the original for consistency checks. */
933 zip_entry_central_dir = *zip_entry;
934
935 zip->decompress_init = 0;
936 zip->end_of_entry = 0;
937 zip->entry_uncompressed_bytes_read = 0;
938 zip->entry_compressed_bytes_read = 0;
939 zip->entry_crc32 = zip->crc32func(0, NULL, 0);
940
941 /* Setup default conversion. */
942 if (zip->sconv == NULL && !zip->init_default_conversion) {
943 zip->sconv_default =
944 archive_string_default_conversion_for_read(&(a->archive));
945 zip->init_default_conversion = 1;
946 }
947
948 if ((p = __archive_read_ahead(a, 30, NULL)) == NULL) {
949 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
950 "Truncated ZIP file header");
951 return (ARCHIVE_FATAL);
952 }
953
954 if (memcmp(p, "PK\003\004", 4) != 0) {
955 archive_set_error(&a->archive, -1, "Damaged Zip archive");
956 return ARCHIVE_FATAL;
957 }
958 version = p[4];
959 zip_entry->system = p[5];
960 zip_entry->zip_flags = archive_le16dec(p + 6);
961 if (zip_entry->zip_flags & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)) {
962 zip->has_encrypted_entries = 1;
963 archive_entry_set_is_data_encrypted(entry, 1);
964 if (zip_entry->zip_flags & ZIP_CENTRAL_DIRECTORY_ENCRYPTED &&
965 zip_entry->zip_flags & ZIP_ENCRYPTED &&
966 zip_entry->zip_flags & ZIP_STRONG_ENCRYPTED) {
967 archive_entry_set_is_metadata_encrypted(entry, 1);
968 return ARCHIVE_FATAL;
969 }
970 }
971 zip->init_decryption = (zip_entry->zip_flags & ZIP_ENCRYPTED);
972 zip_entry->compression = (char)archive_le16dec(p + 8);
973 zip_entry->mtime = zip_time(p + 10);
974 zip_entry->crc32 = archive_le32dec(p + 14);
975 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
976 zip_entry->decdat = p[11];
977 else
978 zip_entry->decdat = p[17];
979 zip_entry->compressed_size = archive_le32dec(p + 18);
980 zip_entry->uncompressed_size = archive_le32dec(p + 22);
981 filename_length = archive_le16dec(p + 26);
982 extra_length = archive_le16dec(p + 28);
983
984 __archive_read_consume(a, 30);
985
986 /* Read the filename. */
987 if ((h = __archive_read_ahead(a, filename_length, NULL)) == NULL) {
988 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
989 "Truncated ZIP file header");
990 return (ARCHIVE_FATAL);
991 }
992 if (zip_entry->zip_flags & ZIP_UTF8_NAME) {
993 /* The filename is stored to be UTF-8. */
994 if (zip->sconv_utf8 == NULL) {
995 zip->sconv_utf8 =
996 archive_string_conversion_from_charset(
997 &a->archive, "UTF-8", 1);
998 if (zip->sconv_utf8 == NULL)
999 return (ARCHIVE_FATAL);
1000 }
1001 sconv = zip->sconv_utf8;
1002 } else if (zip->sconv != NULL)
1003 sconv = zip->sconv;
1004 else
1005 sconv = zip->sconv_default;
1006
1007 if (archive_entry_copy_pathname_l(entry,
1008 h, filename_length, sconv) != 0) {
1009 if (errno == ENOMEM) {
1010 archive_set_error(&a->archive, ENOMEM,
1011 "Can't allocate memory for Pathname");
1012 return (ARCHIVE_FATAL);
1013 }
1014 archive_set_error(&a->archive,
1015 ARCHIVE_ERRNO_FILE_FORMAT,
1016 "Pathname cannot be converted "
1017 "from %s to current locale.",
1018 archive_string_conversion_charset_name(sconv));
1019 ret = ARCHIVE_WARN;
1020 }
1021 __archive_read_consume(a, filename_length);
1022
1023 /* Read the extra data. */
1024 if ((h = __archive_read_ahead(a, extra_length, NULL)) == NULL) {
1025 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1026 "Truncated ZIP file header");
1027 return (ARCHIVE_FATAL);
1028 }
1029
1030 if (ARCHIVE_OK != process_extra(a, entry, h, extra_length,
1031 zip_entry)) {
1032 return ARCHIVE_FATAL;
1033 }
1034 __archive_read_consume(a, extra_length);
1035
1036 /* Work around a bug in Info-Zip: When reading from a pipe, it
1037 * stats the pipe instead of synthesizing a file entry. */
1038 if ((zip_entry->mode & AE_IFMT) == AE_IFIFO) {
1039 zip_entry->mode &= ~ AE_IFMT;
1040 zip_entry->mode |= AE_IFREG;
1041 }
1042
1043 /* If the mode is totally empty, set some sane default. */
1044 if (zip_entry->mode == 0) {
1045 zip_entry->mode |= 0664;
1046 }
1047
1048 /* Windows archivers sometimes use backslash as the directory
1049 * separator. Normalize to slash. */
1050 if (zip_entry->system == 0 &&
1051 (wp = archive_entry_pathname_w(entry)) != NULL) {
1052 if (wcschr(wp, L'/') == NULL && wcschr(wp, L'\\') != NULL) {
1053 size_t i;
1054 struct archive_wstring s;
1055 archive_string_init(&s);
1056 archive_wstrcpy(&s, wp);
1057 for (i = 0; i < archive_strlen(&s); i++) {
1058 if (s.s[i] == '\\')
1059 s.s[i] = '/';
1060 }
1061 archive_entry_copy_pathname_w(entry, s.s);
1062 archive_wstring_free(&s);
1063 }
1064 }
1065
1066 /* Make sure that entries with a trailing '/' are marked as directories
1067 * even if the External File Attributes contains bogus values. If this
1068 * is not a directory and there is no type, assume a regular file. */
1069 if ((zip_entry->mode & AE_IFMT) != AE_IFDIR) {
1070 int has_slash;
1071
1072 wp = archive_entry_pathname_w(entry);
1073 if (wp != NULL) {
1074 len = wcslen(wp);
1075 has_slash = len > 0 && wp[len - 1] == L'/';
1076 } else {
1077 cp = archive_entry_pathname(entry);
1078 len = (cp != NULL)?strlen(cp):0;
1079 has_slash = len > 0 && cp[len - 1] == '/';
1080 }
1081 /* Correct file type as needed. */
1082 if (has_slash) {
1083 zip_entry->mode &= ~AE_IFMT;
1084 zip_entry->mode |= AE_IFDIR;
1085 zip_entry->mode |= 0111;
1086 } else if ((zip_entry->mode & AE_IFMT) == 0) {
1087 zip_entry->mode |= AE_IFREG;
1088 }
1089 }
1090
1091 /* Make sure directories end in '/' */
1092 if ((zip_entry->mode & AE_IFMT) == AE_IFDIR) {
1093 wp = archive_entry_pathname_w(entry);
1094 if (wp != NULL) {
1095 len = wcslen(wp);
1096 if (len > 0 && wp[len - 1] != L'/') {
1097 struct archive_wstring s;
1098 archive_string_init(&s);
1099 archive_wstrcat(&s, wp);
1100 archive_wstrappend_wchar(&s, L'/');
1101 archive_entry_copy_pathname_w(entry, s.s);
1102 archive_wstring_free(&s);
1103 }
1104 } else {
1105 cp = archive_entry_pathname(entry);
1106 len = (cp != NULL)?strlen(cp):0;
1107 if (len > 0 && cp[len - 1] != '/') {
1108 struct archive_string s;
1109 archive_string_init(&s);
1110 archive_strcat(&s, cp);
1111 archive_strappend_char(&s, '/');
1112 archive_entry_set_pathname(entry, s.s);
1113 archive_string_free(&s);
1114 }
1115 }
1116 }
1117
1118 if (zip_entry->flags & LA_FROM_CENTRAL_DIRECTORY) {
1119 /* If this came from the central dir, its size info
1120 * is definitive, so ignore the length-at-end flag. */
1121 zip_entry->zip_flags &= ~ZIP_LENGTH_AT_END;
1122 /* If local header is missing a value, use the one from
1123 the central directory. If both have it, warn about
1124 mismatches. */
1125 if (zip_entry->crc32 == 0) {
1126 zip_entry->crc32 = zip_entry_central_dir.crc32;
1127 } else if (!zip->ignore_crc32
1128 && zip_entry->crc32 != zip_entry_central_dir.crc32) {
1129 archive_set_error(&a->archive,
1130 ARCHIVE_ERRNO_FILE_FORMAT,
1131 "Inconsistent CRC32 values");
1132 ret = ARCHIVE_WARN;
1133 }
1134 if (zip_entry->compressed_size == 0) {
1135 zip_entry->compressed_size
1136 = zip_entry_central_dir.compressed_size;
1137 } else if (zip_entry->compressed_size
1138 != zip_entry_central_dir.compressed_size) {
1139 archive_set_error(&a->archive,
1140 ARCHIVE_ERRNO_FILE_FORMAT,
1141 "Inconsistent compressed size: "
1142 "%jd in central directory, %jd in local header",
1143 (intmax_t)zip_entry_central_dir.compressed_size,
1144 (intmax_t)zip_entry->compressed_size);
1145 ret = ARCHIVE_WARN;
1146 }
1147 if (zip_entry->uncompressed_size == 0) {
1148 zip_entry->uncompressed_size
1149 = zip_entry_central_dir.uncompressed_size;
1150 } else if (zip_entry->uncompressed_size
1151 != zip_entry_central_dir.uncompressed_size) {
1152 archive_set_error(&a->archive,
1153 ARCHIVE_ERRNO_FILE_FORMAT,
1154 "Inconsistent uncompressed size: "
1155 "%jd in central directory, %jd in local header",
1156 (intmax_t)zip_entry_central_dir.uncompressed_size,
1157 (intmax_t)zip_entry->uncompressed_size);
1158 ret = ARCHIVE_WARN;
1159 }
1160 }
1161
1162 /* Populate some additional entry fields: */
1163 archive_entry_set_mode(entry, zip_entry->mode);
1164 archive_entry_set_uid(entry, zip_entry->uid);
1165 archive_entry_set_gid(entry, zip_entry->gid);
1166 archive_entry_set_mtime(entry, zip_entry->mtime, 0);
1167 archive_entry_set_ctime(entry, zip_entry->ctime, 0);
1168 archive_entry_set_atime(entry, zip_entry->atime, 0);
1169
1170 if ((zip->entry->mode & AE_IFMT) == AE_IFLNK) {
1171 size_t linkname_length;
1172
1173 if (zip_entry->compressed_size > 64 * 1024) {
1174 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1175 "Zip file with oversized link entry");
1176 return ARCHIVE_FATAL;
1177 }
1178
1179 linkname_length = (size_t)zip_entry->compressed_size;
1180
1181 archive_entry_set_size(entry, 0);
1182
1183 // take into account link compression if any
1184 size_t linkname_full_length = linkname_length;
1185 if (zip->entry->compression != 0)
1186 {
1187 // symlink target string appeared to be compressed
1188 int status = ARCHIVE_FATAL;
1189 const void *uncompressed_buffer;
1190
1191 switch (zip->entry->compression)
1192 {
1193 #if HAVE_ZLIB_H
1194 case 8: /* Deflate compression. */
1195 zip->entry_bytes_remaining = zip_entry->compressed_size;
1196 status = zip_read_data_deflate(a, &uncompressed_buffer,
1197 &linkname_full_length, NULL);
1198 break;
1199 #endif
1200 #if HAVE_LZMA_H && HAVE_LIBLZMA
1201 case 14: /* ZIPx LZMA compression. */
1202 /*(see zip file format specification, section 4.4.5)*/
1203 zip->entry_bytes_remaining = zip_entry->compressed_size;
1204 status = zip_read_data_zipx_lzma_alone(a, &uncompressed_buffer,
1205 &linkname_full_length, NULL);
1206 break;
1207 #endif
1208 default: /* Unsupported compression. */
1209 break;
1210 }
1211 if (status == ARCHIVE_OK)
1212 {
1213 p = uncompressed_buffer;
1214 }
1215 else
1216 {
1217 archive_set_error(&a->archive,
1218 ARCHIVE_ERRNO_FILE_FORMAT,
1219 "Unsupported ZIP compression method "
1220 "during decompression of link entry (%d: %s)",
1221 zip->entry->compression,
1222 compression_name(zip->entry->compression));
1223 return ARCHIVE_FAILED;
1224 }
1225 }
1226 else
1227 {
1228 p = __archive_read_ahead(a, linkname_length, NULL);
1229 }
1230
1231 if (p == NULL) {
1232 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1233 "Truncated Zip file");
1234 return ARCHIVE_FATAL;
1235 }
1236
1237 sconv = zip->sconv;
1238 if (sconv == NULL && (zip->entry->zip_flags & ZIP_UTF8_NAME))
1239 sconv = zip->sconv_utf8;
1240 if (sconv == NULL)
1241 sconv = zip->sconv_default;
1242 if (archive_entry_copy_symlink_l(entry, p, linkname_full_length,
1243 sconv) != 0) {
1244 if (errno != ENOMEM && sconv == zip->sconv_utf8 &&
1245 (zip->entry->zip_flags & ZIP_UTF8_NAME))
1246 archive_entry_copy_symlink_l(entry, p,
1247 linkname_full_length, NULL);
1248 if (errno == ENOMEM) {
1249 archive_set_error(&a->archive, ENOMEM,
1250 "Can't allocate memory for Symlink");
1251 return (ARCHIVE_FATAL);
1252 }
1253 /*
1254 * Since there is no character-set regulation for
1255 * symlink name, do not report the conversion error
1256 * in an automatic conversion.
1257 */
1258 if (sconv != zip->sconv_utf8 ||
1259 (zip->entry->zip_flags & ZIP_UTF8_NAME) == 0) {
1260 archive_set_error(&a->archive,
1261 ARCHIVE_ERRNO_FILE_FORMAT,
1262 "Symlink cannot be converted "
1263 "from %s to current locale.",
1264 archive_string_conversion_charset_name(
1265 sconv));
1266 ret = ARCHIVE_WARN;
1267 }
1268 }
1269 zip_entry->uncompressed_size = zip_entry->compressed_size = 0;
1270
1271 if (__archive_read_consume(a, linkname_length) < 0) {
1272 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1273 "Read error skipping symlink target name");
1274 return ARCHIVE_FATAL;
1275 }
1276 } else if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1277 || zip_entry->uncompressed_size > 0) {
1278 /* Set the size only if it's meaningful. */
1279 archive_entry_set_size(entry, zip_entry->uncompressed_size);
1280 }
1281 zip->entry_bytes_remaining = zip_entry->compressed_size;
1282
1283 /* If there's no body, force read_data() to return EOF immediately. */
1284 if (0 == (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
1285 && zip->entry_bytes_remaining < 1)
1286 zip->end_of_entry = 1;
1287
1288 /* Set up a more descriptive format name. */
1289 archive_string_empty(&zip->format_name);
1290 archive_string_sprintf(&zip->format_name, "ZIP %d.%d (%s)",
1291 version / 10, version % 10,
1292 compression_name(zip->entry->compression));
1293 a->archive.archive_format_name = zip->format_name.s;
1294
1295 return (ret);
1296 }
1297
1298 static int
check_authentication_code(struct archive_read * a,const void * _p)1299 check_authentication_code(struct archive_read *a, const void *_p)
1300 {
1301 struct zip *zip = (struct zip *)(a->format->data);
1302
1303 /* Check authentication code. */
1304 if (zip->hctx_valid) {
1305 const void *p;
1306 uint8_t hmac[20];
1307 size_t hmac_len = 20;
1308 int cmp;
1309
1310 archive_hmac_sha1_final(&zip->hctx, hmac, &hmac_len);
1311 if (_p == NULL) {
1312 /* Read authentication code. */
1313 p = __archive_read_ahead(a, AUTH_CODE_SIZE, NULL);
1314 if (p == NULL) {
1315 archive_set_error(&a->archive,
1316 ARCHIVE_ERRNO_FILE_FORMAT,
1317 "Truncated ZIP file data");
1318 return (ARCHIVE_FATAL);
1319 }
1320 } else {
1321 p = _p;
1322 }
1323 cmp = memcmp(hmac, p, AUTH_CODE_SIZE);
1324 __archive_read_consume(a, AUTH_CODE_SIZE);
1325 if (cmp != 0) {
1326 archive_set_error(&a->archive,
1327 ARCHIVE_ERRNO_MISC,
1328 "ZIP bad Authentication code");
1329 return (ARCHIVE_WARN);
1330 }
1331 }
1332 return (ARCHIVE_OK);
1333 }
1334
1335 /*
1336 * Read "uncompressed" data. There are three cases:
1337 * 1) We know the size of the data. This is always true for the
1338 * seeking reader (we've examined the Central Directory already).
1339 * 2) ZIP_LENGTH_AT_END was set, but only the CRC was deferred.
1340 * Info-ZIP seems to do this; we know the size but have to grab
1341 * the CRC from the data descriptor afterwards.
1342 * 3) We're streaming and ZIP_LENGTH_AT_END was specified and
1343 * we have no size information. In this case, we can do pretty
1344 * well by watching for the data descriptor record. The data
1345 * descriptor is 16 bytes and includes a computed CRC that should
1346 * provide a strong check.
1347 *
1348 * TODO: Technically, the PK\007\010 signature is optional.
1349 * In the original spec, the data descriptor contained CRC
1350 * and size fields but had no leading signature. In practice,
1351 * newer writers seem to provide the signature pretty consistently.
1352 *
1353 * For uncompressed data, the PK\007\010 marker seems essential
1354 * to be sure we've actually seen the end of the entry.
1355 *
1356 * Returns ARCHIVE_OK if successful, ARCHIVE_FATAL otherwise, sets
1357 * zip->end_of_entry if it consumes all of the data.
1358 */
1359 static int
zip_read_data_none(struct archive_read * a,const void ** _buff,size_t * size,int64_t * offset)1360 zip_read_data_none(struct archive_read *a, const void **_buff,
1361 size_t *size, int64_t *offset)
1362 {
1363 struct zip *zip;
1364 const char *buff;
1365 ssize_t bytes_avail;
1366 int r;
1367
1368 (void)offset; /* UNUSED */
1369
1370 zip = (struct zip *)(a->format->data);
1371
1372 if (zip->entry->zip_flags & ZIP_LENGTH_AT_END) {
1373 const char *p;
1374 ssize_t grabbing_bytes = 24;
1375
1376 if (zip->hctx_valid)
1377 grabbing_bytes += AUTH_CODE_SIZE;
1378 /* Grab at least 24 bytes. */
1379 buff = __archive_read_ahead(a, grabbing_bytes, &bytes_avail);
1380 if (bytes_avail < grabbing_bytes) {
1381 /* Zip archives have end-of-archive markers
1382 that are longer than this, so a failure to get at
1383 least 24 bytes really does indicate a truncated
1384 file. */
1385 archive_set_error(&a->archive,
1386 ARCHIVE_ERRNO_FILE_FORMAT,
1387 "Truncated ZIP file data");
1388 return (ARCHIVE_FATAL);
1389 }
1390 /* Check for a complete PK\007\010 signature, followed
1391 * by the correct 4-byte CRC. */
1392 p = buff;
1393 if (zip->hctx_valid)
1394 p += AUTH_CODE_SIZE;
1395 if (p[0] == 'P' && p[1] == 'K'
1396 && p[2] == '\007' && p[3] == '\010'
1397 && (archive_le32dec(p + 4) == zip->entry_crc32
1398 || zip->ignore_crc32
1399 || (zip->hctx_valid
1400 && zip->entry->aes_extra.vendor == AES_VENDOR_AE_2))) {
1401 if (zip->entry->flags & LA_USED_ZIP64) {
1402 uint64_t compressed, uncompressed;
1403 zip->entry->crc32 = archive_le32dec(p + 4);
1404 compressed = archive_le64dec(p + 8);
1405 uncompressed = archive_le64dec(p + 16);
1406 if (compressed > INT64_MAX || uncompressed >
1407 INT64_MAX) {
1408 archive_set_error(&a->archive,
1409 ARCHIVE_ERRNO_FILE_FORMAT,
1410 "Overflow of 64-bit file sizes");
1411 return ARCHIVE_FAILED;
1412 }
1413 zip->entry->compressed_size = compressed;
1414 zip->entry->uncompressed_size = uncompressed;
1415 zip->unconsumed = 24;
1416 } else {
1417 zip->entry->crc32 = archive_le32dec(p + 4);
1418 zip->entry->compressed_size =
1419 archive_le32dec(p + 8);
1420 zip->entry->uncompressed_size =
1421 archive_le32dec(p + 12);
1422 zip->unconsumed = 16;
1423 }
1424 if (zip->hctx_valid) {
1425 r = check_authentication_code(a, buff);
1426 if (r != ARCHIVE_OK)
1427 return (r);
1428 }
1429 zip->end_of_entry = 1;
1430 return (ARCHIVE_OK);
1431 }
1432 /* If not at EOF, ensure we consume at least one byte. */
1433 ++p;
1434
1435 /* Scan forward until we see where a PK\007\010 signature
1436 * might be. */
1437 /* Return bytes up until that point. On the next call,
1438 * the code above will verify the data descriptor. */
1439 while (p < buff + bytes_avail - 4) {
1440 if (p[3] == 'P') { p += 3; }
1441 else if (p[3] == 'K') { p += 2; }
1442 else if (p[3] == '\007') { p += 1; }
1443 else if (p[3] == '\010' && p[2] == '\007'
1444 && p[1] == 'K' && p[0] == 'P') {
1445 if (zip->hctx_valid)
1446 p -= AUTH_CODE_SIZE;
1447 break;
1448 } else { p += 4; }
1449 }
1450 bytes_avail = p - buff;
1451 } else {
1452 if (zip->entry_bytes_remaining == 0) {
1453 zip->end_of_entry = 1;
1454 if (zip->hctx_valid) {
1455 r = check_authentication_code(a, NULL);
1456 if (r != ARCHIVE_OK)
1457 return (r);
1458 }
1459 return (ARCHIVE_OK);
1460 }
1461 /* Grab a bunch of bytes. */
1462 buff = __archive_read_ahead(a, 1, &bytes_avail);
1463 if (bytes_avail <= 0) {
1464 archive_set_error(&a->archive,
1465 ARCHIVE_ERRNO_FILE_FORMAT,
1466 "Truncated ZIP file data");
1467 return (ARCHIVE_FATAL);
1468 }
1469 if (bytes_avail > zip->entry_bytes_remaining)
1470 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
1471 }
1472 if (zip->tctx_valid || zip->cctx_valid) {
1473 size_t dec_size = bytes_avail;
1474
1475 if (dec_size > zip->decrypted_buffer_size)
1476 dec_size = zip->decrypted_buffer_size;
1477 if (zip->tctx_valid) {
1478 trad_enc_decrypt_update(&zip->tctx,
1479 (const uint8_t *)buff, dec_size,
1480 zip->decrypted_buffer, dec_size);
1481 } else {
1482 size_t dsize = dec_size;
1483 archive_hmac_sha1_update(&zip->hctx,
1484 (const uint8_t *)buff, dec_size);
1485 archive_decrypto_aes_ctr_update(&zip->cctx,
1486 (const uint8_t *)buff, dec_size,
1487 zip->decrypted_buffer, &dsize);
1488 }
1489 bytes_avail = dec_size;
1490 buff = (const char *)zip->decrypted_buffer;
1491 }
1492 *size = bytes_avail;
1493 zip->entry_bytes_remaining -= bytes_avail;
1494 zip->entry_uncompressed_bytes_read += bytes_avail;
1495 zip->entry_compressed_bytes_read += bytes_avail;
1496 zip->unconsumed += bytes_avail;
1497 *_buff = buff;
1498 return (ARCHIVE_OK);
1499 }
1500
1501 static int
consume_optional_marker(struct archive_read * a,struct zip * zip)1502 consume_optional_marker(struct archive_read *a, struct zip *zip)
1503 {
1504 if (zip->end_of_entry && (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
1505 const char *p;
1506
1507 if (NULL == (p = __archive_read_ahead(a, 24, NULL))) {
1508 archive_set_error(&a->archive,
1509 ARCHIVE_ERRNO_FILE_FORMAT,
1510 "Truncated ZIP end-of-file record");
1511 return (ARCHIVE_FATAL);
1512 }
1513 /* Consume the optional PK\007\010 marker. */
1514 if (p[0] == 'P' && p[1] == 'K' &&
1515 p[2] == '\007' && p[3] == '\010') {
1516 p += 4;
1517 zip->unconsumed = 4;
1518 }
1519 if (zip->entry->flags & LA_USED_ZIP64) {
1520 uint64_t compressed, uncompressed;
1521 zip->entry->crc32 = archive_le32dec(p);
1522 compressed = archive_le64dec(p + 4);
1523 uncompressed = archive_le64dec(p + 12);
1524 if (compressed > INT64_MAX ||
1525 uncompressed > INT64_MAX) {
1526 archive_set_error(&a->archive,
1527 ARCHIVE_ERRNO_FILE_FORMAT,
1528 "Overflow of 64-bit file sizes");
1529 return ARCHIVE_FAILED;
1530 }
1531 zip->entry->compressed_size = compressed;
1532 zip->entry->uncompressed_size = uncompressed;
1533 zip->unconsumed += 20;
1534 } else {
1535 zip->entry->crc32 = archive_le32dec(p);
1536 zip->entry->compressed_size = archive_le32dec(p + 4);
1537 zip->entry->uncompressed_size = archive_le32dec(p + 8);
1538 zip->unconsumed += 12;
1539 }
1540 }
1541
1542 return (ARCHIVE_OK);
1543 }
1544
1545 #if HAVE_LZMA_H && HAVE_LIBLZMA
1546 static int
zipx_xz_init(struct archive_read * a,struct zip * zip)1547 zipx_xz_init(struct archive_read *a, struct zip *zip)
1548 {
1549 lzma_ret r;
1550
1551 if(zip->zipx_lzma_valid) {
1552 lzma_end(&zip->zipx_lzma_stream);
1553 zip->zipx_lzma_valid = 0;
1554 }
1555
1556 memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream));
1557 r = lzma_stream_decoder(&zip->zipx_lzma_stream, UINT64_MAX, 0);
1558 if (r != LZMA_OK) {
1559 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
1560 "xz initialization failed(%d)",
1561 r);
1562
1563 return (ARCHIVE_FAILED);
1564 }
1565
1566 zip->zipx_lzma_valid = 1;
1567
1568 free(zip->uncompressed_buffer);
1569
1570 zip->uncompressed_buffer_size = 256 * 1024;
1571 zip->uncompressed_buffer =
1572 (uint8_t*) malloc(zip->uncompressed_buffer_size);
1573 if (zip->uncompressed_buffer == NULL) {
1574 archive_set_error(&a->archive, ENOMEM,
1575 "No memory for xz decompression");
1576 return (ARCHIVE_FATAL);
1577 }
1578
1579 zip->decompress_init = 1;
1580 return (ARCHIVE_OK);
1581 }
1582
1583 static int
zipx_lzma_alone_init(struct archive_read * a,struct zip * zip)1584 zipx_lzma_alone_init(struct archive_read *a, struct zip *zip)
1585 {
1586 lzma_ret r;
1587 const uint8_t* p;
1588
1589 #pragma pack(push)
1590 #pragma pack(1)
1591 struct _alone_header {
1592 uint8_t bytes[5];
1593 uint64_t uncompressed_size;
1594 } alone_header;
1595 #pragma pack(pop)
1596
1597 if(zip->zipx_lzma_valid) {
1598 lzma_end(&zip->zipx_lzma_stream);
1599 zip->zipx_lzma_valid = 0;
1600 }
1601
1602 /* To unpack ZIPX's "LZMA" (id 14) stream we can use standard liblzma
1603 * that is a part of XZ Utils. The stream format stored inside ZIPX
1604 * file is a modified "lzma alone" file format, that was used by the
1605 * `lzma` utility which was later deprecated in favour of `xz` utility.
1606 * Since those formats are nearly the same, we can use a standard
1607 * "lzma alone" decoder from XZ Utils. */
1608
1609 memset(&zip->zipx_lzma_stream, 0, sizeof(zip->zipx_lzma_stream));
1610 r = lzma_alone_decoder(&zip->zipx_lzma_stream, UINT64_MAX);
1611 if (r != LZMA_OK) {
1612 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
1613 "lzma initialization failed(%d)", r);
1614
1615 return (ARCHIVE_FAILED);
1616 }
1617
1618 /* Flag the cleanup function that we want our lzma-related structures
1619 * to be freed later. */
1620 zip->zipx_lzma_valid = 1;
1621
1622 /* The "lzma alone" file format and the stream format inside ZIPx are
1623 * almost the same. Here's an example of a structure of "lzma alone"
1624 * format:
1625 *
1626 * $ cat /bin/ls | lzma | xxd | head -n 1
1627 * 00000000: 5d00 0080 00ff ffff ffff ffff ff00 2814
1628 *
1629 * 5 bytes 8 bytes n bytes
1630 * <lzma_params><uncompressed_size><data...>
1631 *
1632 * lzma_params is a 5-byte blob that has to be decoded to extract
1633 * parameters of this LZMA stream. The uncompressed_size field is an
1634 * uint64_t value that contains information about the size of the
1635 * uncompressed file, or UINT64_MAX if this value is unknown.
1636 * The <data...> part is the actual lzma-compressed data stream.
1637 *
1638 * Now here's the structure of the stream inside the ZIPX file:
1639 *
1640 * $ cat stream_inside_zipx | xxd | head -n 1
1641 * 00000000: 0914 0500 5d00 8000 0000 2814 .... ....
1642 *
1643 * 2byte 2byte 5 bytes n bytes
1644 * <magic1><magic2><lzma_params><data...>
1645 *
1646 * This means that the ZIPX file contains an additional magic1 and
1647 * magic2 headers, the lzma_params field contains the same parameter
1648 * set as in the "lzma alone" format, and the <data...> field is the
1649 * same as in the "lzma alone" format as well. Note that also the zipx
1650 * format is missing the uncompressed_size field.
1651 *
1652 * So, in order to use the "lzma alone" decoder for the zipx lzma
1653 * stream, we simply need to shuffle around some fields, prepare a new
1654 * lzma alone header, feed it into lzma alone decoder so it will
1655 * initialize itself properly, and then we can start feeding normal
1656 * zipx lzma stream into the decoder.
1657 */
1658
1659 /* Read magic1,magic2,lzma_params from the ZIPX stream. */
1660 if((p = __archive_read_ahead(a, 9, NULL)) == NULL) {
1661 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1662 "Truncated lzma data");
1663 return (ARCHIVE_FATAL);
1664 }
1665
1666 if(p[2] != 0x05 || p[3] != 0x00) {
1667 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1668 "Invalid lzma data");
1669 return (ARCHIVE_FATAL);
1670 }
1671
1672 /* Prepare an lzma alone header: copy the lzma_params blob into
1673 * a proper place into the lzma alone header. */
1674 memcpy(&alone_header.bytes[0], p + 4, 5);
1675
1676 /* Initialize the 'uncompressed size' field to unknown; we'll manually
1677 * monitor how many bytes there are still to be uncompressed. */
1678 alone_header.uncompressed_size = UINT64_MAX;
1679
1680 if(!zip->uncompressed_buffer) {
1681 zip->uncompressed_buffer_size = 256 * 1024;
1682 zip->uncompressed_buffer =
1683 (uint8_t*) malloc(zip->uncompressed_buffer_size);
1684
1685 if (zip->uncompressed_buffer == NULL) {
1686 archive_set_error(&a->archive, ENOMEM,
1687 "No memory for lzma decompression");
1688 return (ARCHIVE_FATAL);
1689 }
1690 }
1691
1692 zip->zipx_lzma_stream.next_in = (void*) &alone_header;
1693 zip->zipx_lzma_stream.avail_in = sizeof(alone_header);
1694 zip->zipx_lzma_stream.total_in = 0;
1695 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer;
1696 zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size;
1697 zip->zipx_lzma_stream.total_out = 0;
1698
1699 /* Feed only the header into the lzma alone decoder. This will
1700 * effectively initialize the decoder, and will not produce any
1701 * output bytes yet. */
1702 r = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN);
1703 if (r != LZMA_OK) {
1704 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
1705 "lzma stream initialization error");
1706 return ARCHIVE_FATAL;
1707 }
1708
1709 /* We've already consumed some bytes, so take this into account. */
1710 __archive_read_consume(a, 9);
1711 zip->entry_bytes_remaining -= 9;
1712 zip->entry_compressed_bytes_read += 9;
1713
1714 zip->decompress_init = 1;
1715 return (ARCHIVE_OK);
1716 }
1717
1718 static int
zip_read_data_zipx_xz(struct archive_read * a,const void ** buff,size_t * size,int64_t * offset)1719 zip_read_data_zipx_xz(struct archive_read *a, const void **buff,
1720 size_t *size, int64_t *offset)
1721 {
1722 struct zip* zip = (struct zip *)(a->format->data);
1723 int ret;
1724 lzma_ret lz_ret;
1725 const void* compressed_buf;
1726 ssize_t bytes_avail, in_bytes, to_consume = 0;
1727
1728 (void) offset; /* UNUSED */
1729
1730 /* Initialize decompressor if not yet initialized. */
1731 if (!zip->decompress_init) {
1732 ret = zipx_xz_init(a, zip);
1733 if (ret != ARCHIVE_OK)
1734 return (ret);
1735 }
1736
1737 compressed_buf = __archive_read_ahead(a, 1, &bytes_avail);
1738 if (bytes_avail < 0) {
1739 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1740 "Truncated xz file body");
1741 return (ARCHIVE_FATAL);
1742 }
1743
1744 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail);
1745 zip->zipx_lzma_stream.next_in = compressed_buf;
1746 zip->zipx_lzma_stream.avail_in = in_bytes;
1747 zip->zipx_lzma_stream.total_in = 0;
1748 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer;
1749 zip->zipx_lzma_stream.avail_out = zip->uncompressed_buffer_size;
1750 zip->zipx_lzma_stream.total_out = 0;
1751
1752 /* Perform the decompression. */
1753 lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN);
1754 switch(lz_ret) {
1755 case LZMA_DATA_ERROR:
1756 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1757 "xz data error (error %d)", (int) lz_ret);
1758 return (ARCHIVE_FATAL);
1759
1760 case LZMA_NO_CHECK:
1761 case LZMA_OK:
1762 break;
1763
1764 default:
1765 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1766 "xz unknown error %d", (int) lz_ret);
1767 return (ARCHIVE_FATAL);
1768
1769 case LZMA_STREAM_END:
1770 lzma_end(&zip->zipx_lzma_stream);
1771 zip->zipx_lzma_valid = 0;
1772
1773 if((int64_t) zip->zipx_lzma_stream.total_in !=
1774 zip->entry_bytes_remaining)
1775 {
1776 archive_set_error(&a->archive,
1777 ARCHIVE_ERRNO_MISC,
1778 "xz premature end of stream");
1779 return (ARCHIVE_FATAL);
1780 }
1781
1782 zip->end_of_entry = 1;
1783 break;
1784 }
1785
1786 to_consume = zip->zipx_lzma_stream.total_in;
1787
1788 __archive_read_consume(a, to_consume);
1789 zip->entry_bytes_remaining -= to_consume;
1790 zip->entry_compressed_bytes_read += to_consume;
1791 zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out;
1792
1793 *size = zip->zipx_lzma_stream.total_out;
1794 *buff = zip->uncompressed_buffer;
1795
1796 ret = consume_optional_marker(a, zip);
1797 if (ret != ARCHIVE_OK)
1798 return (ret);
1799
1800 return (ARCHIVE_OK);
1801 }
1802
1803 static int
zip_read_data_zipx_lzma_alone(struct archive_read * a,const void ** buff,size_t * size,int64_t * offset)1804 zip_read_data_zipx_lzma_alone(struct archive_read *a, const void **buff,
1805 size_t *size, int64_t *offset)
1806 {
1807 struct zip* zip = (struct zip *)(a->format->data);
1808 int ret;
1809 lzma_ret lz_ret;
1810 const void* compressed_buf;
1811 ssize_t bytes_avail, in_bytes, to_consume;
1812
1813 (void) offset; /* UNUSED */
1814
1815 /* Initialize decompressor if not yet initialized. */
1816 if (!zip->decompress_init) {
1817 ret = zipx_lzma_alone_init(a, zip);
1818 if (ret != ARCHIVE_OK)
1819 return (ret);
1820 }
1821
1822 /* Fetch more compressed data. The same note as in deflate handler
1823 * applies here as well:
1824 *
1825 * Note: '1' here is a performance optimization. Recall that the
1826 * decompression layer returns a count of available bytes; asking for
1827 * more than that forces the decompressor to combine reads by copying
1828 * data.
1829 */
1830 compressed_buf = __archive_read_ahead(a, 1, &bytes_avail);
1831 if (bytes_avail < 0) {
1832 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1833 "Truncated lzma file body");
1834 return (ARCHIVE_FATAL);
1835 }
1836
1837 /* Set decompressor parameters. */
1838 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail);
1839
1840 zip->zipx_lzma_stream.next_in = compressed_buf;
1841 zip->zipx_lzma_stream.avail_in = in_bytes;
1842 zip->zipx_lzma_stream.total_in = 0;
1843 zip->zipx_lzma_stream.next_out = zip->uncompressed_buffer;
1844 zip->zipx_lzma_stream.avail_out =
1845 /* These lzma_alone streams lack end of stream marker, so let's
1846 * make sure the unpacker won't try to unpack more than it's
1847 * supposed to. */
1848 zipmin((int64_t) zip->uncompressed_buffer_size,
1849 zip->entry->uncompressed_size -
1850 zip->entry_uncompressed_bytes_read);
1851 zip->zipx_lzma_stream.total_out = 0;
1852
1853 /* Perform the decompression. */
1854 lz_ret = lzma_code(&zip->zipx_lzma_stream, LZMA_RUN);
1855 switch(lz_ret) {
1856 case LZMA_DATA_ERROR:
1857 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1858 "lzma data error (error %d)", (int) lz_ret);
1859 return (ARCHIVE_FATAL);
1860
1861 /* This case is optional in lzma alone format. It can happen,
1862 * but most of the files don't have it. (GitHub #1257) */
1863 case LZMA_STREAM_END:
1864 lzma_end(&zip->zipx_lzma_stream);
1865 zip->zipx_lzma_valid = 0;
1866 if((int64_t) zip->zipx_lzma_stream.total_in !=
1867 zip->entry_bytes_remaining)
1868 {
1869 archive_set_error(&a->archive,
1870 ARCHIVE_ERRNO_MISC,
1871 "lzma alone premature end of stream");
1872 return (ARCHIVE_FATAL);
1873 }
1874
1875 zip->end_of_entry = 1;
1876 break;
1877
1878 case LZMA_OK:
1879 break;
1880
1881 default:
1882 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
1883 "lzma unknown error %d", (int) lz_ret);
1884 return (ARCHIVE_FATAL);
1885 }
1886
1887 to_consume = zip->zipx_lzma_stream.total_in;
1888
1889 /* Update pointers. */
1890 __archive_read_consume(a, to_consume);
1891 zip->entry_bytes_remaining -= to_consume;
1892 zip->entry_compressed_bytes_read += to_consume;
1893 zip->entry_uncompressed_bytes_read += zip->zipx_lzma_stream.total_out;
1894
1895 if(zip->entry_bytes_remaining == 0) {
1896 zip->end_of_entry = 1;
1897 }
1898
1899 /* Return values. */
1900 *size = zip->zipx_lzma_stream.total_out;
1901 *buff = zip->uncompressed_buffer;
1902
1903 /* Behave the same way as during deflate decompression. */
1904 ret = consume_optional_marker(a, zip);
1905 if (ret != ARCHIVE_OK)
1906 return (ret);
1907
1908 /* Free lzma decoder handle because we'll no longer need it. */
1909 if(zip->end_of_entry) {
1910 lzma_end(&zip->zipx_lzma_stream);
1911 zip->zipx_lzma_valid = 0;
1912 }
1913
1914 /* If we're here, then we're good! */
1915 return (ARCHIVE_OK);
1916 }
1917 #endif /* HAVE_LZMA_H && HAVE_LIBLZMA */
1918
1919 static int
zipx_ppmd8_init(struct archive_read * a,struct zip * zip)1920 zipx_ppmd8_init(struct archive_read *a, struct zip *zip)
1921 {
1922 const void* p;
1923 uint32_t val;
1924 uint32_t order;
1925 uint32_t mem;
1926 uint32_t restore_method;
1927
1928 /* Remove previous decompression context if it exists. */
1929 if(zip->ppmd8_valid) {
1930 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8);
1931 zip->ppmd8_valid = 0;
1932 }
1933
1934 /* Create a new decompression context. */
1935 __archive_ppmd8_functions.Ppmd8_Construct(&zip->ppmd8);
1936 zip->ppmd8_stream_failed = 0;
1937
1938 /* Setup function pointers required by Ppmd8 decompressor. The
1939 * 'ppmd_read' function will feed new bytes to the decompressor,
1940 * and will increment the 'zip->zipx_ppmd_read_compressed' counter. */
1941 zip->ppmd8.Stream.In = &zip->zipx_ppmd_stream;
1942 zip->zipx_ppmd_stream.a = a;
1943 zip->zipx_ppmd_stream.Read = &ppmd_read;
1944
1945 /* Reset number of read bytes to 0. */
1946 zip->zipx_ppmd_read_compressed = 0;
1947
1948 /* Read Ppmd8 header (2 bytes). */
1949 p = __archive_read_ahead(a, 2, NULL);
1950 if(!p) {
1951 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1952 "Truncated file data in PPMd8 stream");
1953 return (ARCHIVE_FATAL);
1954 }
1955 __archive_read_consume(a, 2);
1956
1957 /* Decode the stream's compression parameters. */
1958 val = archive_le16dec(p);
1959 order = (val & 15) + 1;
1960 mem = ((val >> 4) & 0xff) + 1;
1961 restore_method = (val >> 12);
1962
1963 if(order < 2 || restore_method > 2) {
1964 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
1965 "Invalid parameter set in PPMd8 stream (order=%" PRId32 ", "
1966 "restore=%" PRId32 ")", order, restore_method);
1967 return (ARCHIVE_FAILED);
1968 }
1969
1970 /* Allocate the memory needed to properly decompress the file. */
1971 if(!__archive_ppmd8_functions.Ppmd8_Alloc(&zip->ppmd8, mem << 20)) {
1972 archive_set_error(&a->archive, ENOMEM,
1973 "Unable to allocate memory for PPMd8 stream: %" PRId32 " bytes",
1974 mem << 20);
1975 return (ARCHIVE_FATAL);
1976 }
1977
1978 /* Signal the cleanup function to release Ppmd8 context in the
1979 * cleanup phase. */
1980 zip->ppmd8_valid = 1;
1981
1982 /* Perform further Ppmd8 initialization. */
1983 if(!__archive_ppmd8_functions.Ppmd8_RangeDec_Init(&zip->ppmd8)) {
1984 archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
1985 "PPMd8 stream range decoder initialization error");
1986 return (ARCHIVE_FATAL);
1987 }
1988
1989 __archive_ppmd8_functions.Ppmd8_Init(&zip->ppmd8, order,
1990 restore_method);
1991
1992 /* Allocate the buffer that will hold uncompressed data. */
1993 free(zip->uncompressed_buffer);
1994
1995 zip->uncompressed_buffer_size = 256 * 1024;
1996 zip->uncompressed_buffer =
1997 (uint8_t*) malloc(zip->uncompressed_buffer_size);
1998
1999 if(zip->uncompressed_buffer == NULL) {
2000 archive_set_error(&a->archive, ENOMEM,
2001 "No memory for PPMd8 decompression");
2002 return ARCHIVE_FATAL;
2003 }
2004
2005 /* Ppmd8 initialization is done. */
2006 zip->decompress_init = 1;
2007
2008 /* We've already read 2 bytes in the output stream. Additionally,
2009 * Ppmd8 initialization code could read some data as well. So we
2010 * are advancing the stream by 2 bytes plus whatever number of
2011 * bytes Ppmd8 init function used. */
2012 zip->entry_compressed_bytes_read += 2 + zip->zipx_ppmd_read_compressed;
2013
2014 return ARCHIVE_OK;
2015 }
2016
2017 static int
zip_read_data_zipx_ppmd(struct archive_read * a,const void ** buff,size_t * size,int64_t * offset)2018 zip_read_data_zipx_ppmd(struct archive_read *a, const void **buff,
2019 size_t *size, int64_t *offset)
2020 {
2021 struct zip* zip = (struct zip *)(a->format->data);
2022 int ret;
2023 size_t consumed_bytes = 0;
2024 ssize_t bytes_avail = 0;
2025
2026 (void) offset; /* UNUSED */
2027
2028 /* If we're here for the first time, initialize Ppmd8 decompression
2029 * context first. */
2030 if(!zip->decompress_init) {
2031 ret = zipx_ppmd8_init(a, zip);
2032 if(ret != ARCHIVE_OK)
2033 return ret;
2034 }
2035
2036 /* Fetch for more data. We're reading 1 byte here, but libarchive
2037 * should prefetch more bytes. */
2038 (void) __archive_read_ahead(a, 1, &bytes_avail);
2039 if(bytes_avail < 0) {
2040 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2041 "Truncated PPMd8 file body");
2042 return (ARCHIVE_FATAL);
2043 }
2044
2045 /* This counter will be updated inside ppmd_read(), which at one
2046 * point will be called by Ppmd8_DecodeSymbol. */
2047 zip->zipx_ppmd_read_compressed = 0;
2048
2049 /* Decompression loop. */
2050 do {
2051 int sym = __archive_ppmd8_functions.Ppmd8_DecodeSymbol(
2052 &zip->ppmd8);
2053 if(sym < 0) {
2054 zip->end_of_entry = 1;
2055 break;
2056 }
2057
2058 /* This field is set by ppmd_read() when there was no more data
2059 * to be read. */
2060 if(zip->ppmd8_stream_failed) {
2061 archive_set_error(&a->archive,
2062 ARCHIVE_ERRNO_FILE_FORMAT,
2063 "Truncated PPMd8 file body");
2064 return (ARCHIVE_FATAL);
2065 }
2066
2067 zip->uncompressed_buffer[consumed_bytes] = (uint8_t) sym;
2068 ++consumed_bytes;
2069 } while(consumed_bytes < zip->uncompressed_buffer_size);
2070
2071 /* Update pointers for libarchive. */
2072 *buff = zip->uncompressed_buffer;
2073 *size = consumed_bytes;
2074
2075 /* Update pointers so we can continue decompression in another call. */
2076 zip->entry_bytes_remaining -= zip->zipx_ppmd_read_compressed;
2077 zip->entry_compressed_bytes_read += zip->zipx_ppmd_read_compressed;
2078 zip->entry_uncompressed_bytes_read += consumed_bytes;
2079
2080 /* If we're at the end of stream, deinitialize Ppmd8 context. */
2081 if(zip->end_of_entry) {
2082 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8);
2083 zip->ppmd8_valid = 0;
2084 }
2085
2086 /* Seek for optional marker, same way as in each zip entry. */
2087 ret = consume_optional_marker(a, zip);
2088 if (ret != ARCHIVE_OK)
2089 return ret;
2090
2091 return ARCHIVE_OK;
2092 }
2093
2094 #ifdef HAVE_BZLIB_H
2095 static int
zipx_bzip2_init(struct archive_read * a,struct zip * zip)2096 zipx_bzip2_init(struct archive_read *a, struct zip *zip)
2097 {
2098 int r;
2099
2100 /* Deallocate already existing BZ2 decompression context if it
2101 * exists. */
2102 if(zip->bzstream_valid) {
2103 BZ2_bzDecompressEnd(&zip->bzstream);
2104 zip->bzstream_valid = 0;
2105 }
2106
2107 /* Allocate a new BZ2 decompression context. */
2108 memset(&zip->bzstream, 0, sizeof(bz_stream));
2109 r = BZ2_bzDecompressInit(&zip->bzstream, 0, 1);
2110 if(r != BZ_OK) {
2111 archive_set_error(&(a->archive), ARCHIVE_ERRNO_MISC,
2112 "bzip2 initialization failed(%d)",
2113 r);
2114
2115 return ARCHIVE_FAILED;
2116 }
2117
2118 /* Mark the bzstream field to be released in cleanup phase. */
2119 zip->bzstream_valid = 1;
2120
2121 /* (Re)allocate the buffer that will contain decompressed bytes. */
2122 free(zip->uncompressed_buffer);
2123
2124 zip->uncompressed_buffer_size = 256 * 1024;
2125 zip->uncompressed_buffer =
2126 (uint8_t*) malloc(zip->uncompressed_buffer_size);
2127 if (zip->uncompressed_buffer == NULL) {
2128 archive_set_error(&a->archive, ENOMEM,
2129 "No memory for bzip2 decompression");
2130 return ARCHIVE_FATAL;
2131 }
2132
2133 /* Initialization done. */
2134 zip->decompress_init = 1;
2135 return ARCHIVE_OK;
2136 }
2137
2138 static int
zip_read_data_zipx_bzip2(struct archive_read * a,const void ** buff,size_t * size,int64_t * offset)2139 zip_read_data_zipx_bzip2(struct archive_read *a, const void **buff,
2140 size_t *size, int64_t *offset)
2141 {
2142 struct zip *zip = (struct zip *)(a->format->data);
2143 ssize_t bytes_avail = 0, in_bytes, to_consume;
2144 const void *compressed_buff;
2145 int r;
2146 uint64_t total_out;
2147
2148 (void) offset; /* UNUSED */
2149
2150 /* Initialize decompression context if we're here for the first time. */
2151 if(!zip->decompress_init) {
2152 r = zipx_bzip2_init(a, zip);
2153 if(r != ARCHIVE_OK)
2154 return r;
2155 }
2156
2157 /* Fetch more compressed bytes. */
2158 compressed_buff = __archive_read_ahead(a, 1, &bytes_avail);
2159 if(bytes_avail < 0) {
2160 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2161 "Truncated bzip2 file body");
2162 return (ARCHIVE_FATAL);
2163 }
2164
2165 in_bytes = zipmin(zip->entry_bytes_remaining, bytes_avail);
2166 if(in_bytes < 1) {
2167 /* libbz2 doesn't complain when caller feeds avail_in == 0.
2168 * It will actually return success in this case, which is
2169 * undesirable. This is why we need to make this check
2170 * manually. */
2171
2172 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2173 "Truncated bzip2 file body");
2174 return (ARCHIVE_FATAL);
2175 }
2176
2177 /* Setup buffer boundaries. */
2178 zip->bzstream.next_in = (char*)(uintptr_t) compressed_buff;
2179 zip->bzstream.avail_in = in_bytes;
2180 zip->bzstream.total_in_hi32 = 0;
2181 zip->bzstream.total_in_lo32 = 0;
2182 zip->bzstream.next_out = (char*) zip->uncompressed_buffer;
2183 zip->bzstream.avail_out = zip->uncompressed_buffer_size;
2184 zip->bzstream.total_out_hi32 = 0;
2185 zip->bzstream.total_out_lo32 = 0;
2186
2187 /* Perform the decompression. */
2188 r = BZ2_bzDecompress(&zip->bzstream);
2189 switch(r) {
2190 case BZ_STREAM_END:
2191 /* If we're at the end of the stream, deinitialize the
2192 * decompression context now. */
2193 switch(BZ2_bzDecompressEnd(&zip->bzstream)) {
2194 case BZ_OK:
2195 break;
2196 default:
2197 archive_set_error(&a->archive,
2198 ARCHIVE_ERRNO_MISC,
2199 "Failed to clean up bzip2 "
2200 "decompressor");
2201 return ARCHIVE_FATAL;
2202 }
2203
2204 zip->end_of_entry = 1;
2205 break;
2206 case BZ_OK:
2207 /* The decompressor has successfully decoded this
2208 * chunk of data, but more data is still in queue. */
2209 break;
2210 default:
2211 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2212 "bzip2 decompression failed");
2213 return ARCHIVE_FATAL;
2214 }
2215
2216 /* Update the pointers so decompressor can continue decoding. */
2217 to_consume = zip->bzstream.total_in_lo32;
2218 __archive_read_consume(a, to_consume);
2219
2220 total_out = ((uint64_t) zip->bzstream.total_out_hi32 << 32) +
2221 zip->bzstream.total_out_lo32;
2222
2223 zip->entry_bytes_remaining -= to_consume;
2224 zip->entry_compressed_bytes_read += to_consume;
2225 zip->entry_uncompressed_bytes_read += total_out;
2226
2227 /* Give libarchive its due. */
2228 *size = total_out;
2229 *buff = zip->uncompressed_buffer;
2230
2231 /* Seek for optional marker, like in other entries. */
2232 r = consume_optional_marker(a, zip);
2233 if(r != ARCHIVE_OK)
2234 return r;
2235
2236 return ARCHIVE_OK;
2237 }
2238
2239 #endif
2240
2241 #ifdef HAVE_ZLIB_H
2242 static int
zip_deflate_init(struct archive_read * a,struct zip * zip)2243 zip_deflate_init(struct archive_read *a, struct zip *zip)
2244 {
2245 int r;
2246
2247 /* If we haven't yet read any data, initialize the decompressor. */
2248 if (!zip->decompress_init) {
2249 if (zip->stream_valid)
2250 r = inflateReset(&zip->stream);
2251 else
2252 r = inflateInit2(&zip->stream,
2253 -15 /* Don't check for zlib header */);
2254 if (r != Z_OK) {
2255 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2256 "Can't initialize ZIP decompression.");
2257 return (ARCHIVE_FATAL);
2258 }
2259 /* Stream structure has been set up. */
2260 zip->stream_valid = 1;
2261 /* We've initialized decompression for this stream. */
2262 zip->decompress_init = 1;
2263 }
2264 return (ARCHIVE_OK);
2265 }
2266
2267 static int
zip_read_data_deflate(struct archive_read * a,const void ** buff,size_t * size,int64_t * offset)2268 zip_read_data_deflate(struct archive_read *a, const void **buff,
2269 size_t *size, int64_t *offset)
2270 {
2271 struct zip *zip;
2272 ssize_t bytes_avail;
2273 const void *compressed_buff, *sp;
2274 int r;
2275
2276 (void)offset; /* UNUSED */
2277
2278 zip = (struct zip *)(a->format->data);
2279
2280 /* If the buffer hasn't been allocated, allocate it now. */
2281 if (zip->uncompressed_buffer == NULL) {
2282 zip->uncompressed_buffer_size = 256 * 1024;
2283 zip->uncompressed_buffer
2284 = (unsigned char *)malloc(zip->uncompressed_buffer_size);
2285 if (zip->uncompressed_buffer == NULL) {
2286 archive_set_error(&a->archive, ENOMEM,
2287 "No memory for ZIP decompression");
2288 return (ARCHIVE_FATAL);
2289 }
2290 }
2291
2292 r = zip_deflate_init(a, zip);
2293 if (r != ARCHIVE_OK)
2294 return (r);
2295
2296 /*
2297 * Note: '1' here is a performance optimization.
2298 * Recall that the decompression layer returns a count of
2299 * available bytes; asking for more than that forces the
2300 * decompressor to combine reads by copying data.
2301 */
2302 compressed_buff = sp = __archive_read_ahead(a, 1, &bytes_avail);
2303 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2304 && bytes_avail > zip->entry_bytes_remaining) {
2305 bytes_avail = (ssize_t)zip->entry_bytes_remaining;
2306 }
2307 if (bytes_avail < 0) {
2308 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2309 "Truncated ZIP file body");
2310 return (ARCHIVE_FATAL);
2311 }
2312
2313 if (zip->tctx_valid || zip->cctx_valid) {
2314 if (zip->decrypted_bytes_remaining < (size_t)bytes_avail) {
2315 size_t buff_remaining =
2316 (zip->decrypted_buffer +
2317 zip->decrypted_buffer_size)
2318 - (zip->decrypted_ptr +
2319 zip->decrypted_bytes_remaining);
2320
2321 if (buff_remaining > (size_t)bytes_avail)
2322 buff_remaining = (size_t)bytes_avail;
2323
2324 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END) &&
2325 zip->entry_bytes_remaining > 0) {
2326 if ((int64_t)(zip->decrypted_bytes_remaining
2327 + buff_remaining)
2328 > zip->entry_bytes_remaining) {
2329 if (zip->entry_bytes_remaining <
2330 (int64_t)zip->decrypted_bytes_remaining)
2331 buff_remaining = 0;
2332 else
2333 buff_remaining =
2334 (size_t)zip->entry_bytes_remaining
2335 - zip->decrypted_bytes_remaining;
2336 }
2337 }
2338 if (buff_remaining > 0) {
2339 if (zip->tctx_valid) {
2340 trad_enc_decrypt_update(&zip->tctx,
2341 compressed_buff, buff_remaining,
2342 zip->decrypted_ptr
2343 + zip->decrypted_bytes_remaining,
2344 buff_remaining);
2345 } else {
2346 size_t dsize = buff_remaining;
2347 archive_decrypto_aes_ctr_update(
2348 &zip->cctx,
2349 compressed_buff, buff_remaining,
2350 zip->decrypted_ptr
2351 + zip->decrypted_bytes_remaining,
2352 &dsize);
2353 }
2354 zip->decrypted_bytes_remaining +=
2355 buff_remaining;
2356 }
2357 }
2358 bytes_avail = zip->decrypted_bytes_remaining;
2359 compressed_buff = (const char *)zip->decrypted_ptr;
2360 }
2361
2362 /*
2363 * A bug in zlib.h: stream.next_in should be marked 'const'
2364 * but isn't (the library never alters data through the
2365 * next_in pointer, only reads it). The result: this ugly
2366 * cast to remove 'const'.
2367 */
2368 zip->stream.next_in = (Bytef *)(uintptr_t)(const void *)compressed_buff;
2369 zip->stream.avail_in = (uInt)bytes_avail;
2370 zip->stream.total_in = 0;
2371 zip->stream.next_out = zip->uncompressed_buffer;
2372 zip->stream.avail_out = (uInt)zip->uncompressed_buffer_size;
2373 zip->stream.total_out = 0;
2374
2375 r = inflate(&zip->stream, 0);
2376 switch (r) {
2377 case Z_OK:
2378 break;
2379 case Z_STREAM_END:
2380 zip->end_of_entry = 1;
2381 break;
2382 case Z_MEM_ERROR:
2383 archive_set_error(&a->archive, ENOMEM,
2384 "Out of memory for ZIP decompression");
2385 return (ARCHIVE_FATAL);
2386 default:
2387 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2388 "ZIP decompression failed (%d)", r);
2389 return (ARCHIVE_FATAL);
2390 }
2391
2392 /* Consume as much as the compressor actually used. */
2393 bytes_avail = zip->stream.total_in;
2394 if (zip->tctx_valid || zip->cctx_valid) {
2395 zip->decrypted_bytes_remaining -= bytes_avail;
2396 if (zip->decrypted_bytes_remaining == 0)
2397 zip->decrypted_ptr = zip->decrypted_buffer;
2398 else
2399 zip->decrypted_ptr += bytes_avail;
2400 }
2401 /* Calculate compressed data as much as we used.*/
2402 if (zip->hctx_valid)
2403 archive_hmac_sha1_update(&zip->hctx, sp, bytes_avail);
2404 __archive_read_consume(a, bytes_avail);
2405 zip->entry_bytes_remaining -= bytes_avail;
2406 zip->entry_compressed_bytes_read += bytes_avail;
2407
2408 *size = zip->stream.total_out;
2409 zip->entry_uncompressed_bytes_read += zip->stream.total_out;
2410 *buff = zip->uncompressed_buffer;
2411
2412 if (zip->end_of_entry && zip->hctx_valid) {
2413 r = check_authentication_code(a, NULL);
2414 if (r != ARCHIVE_OK)
2415 return (r);
2416 }
2417
2418 r = consume_optional_marker(a, zip);
2419 if (r != ARCHIVE_OK)
2420 return (r);
2421
2422 return (ARCHIVE_OK);
2423 }
2424 #endif
2425
2426 static int
read_decryption_header(struct archive_read * a)2427 read_decryption_header(struct archive_read *a)
2428 {
2429 struct zip *zip = (struct zip *)(a->format->data);
2430 const char *p;
2431 unsigned int remaining_size;
2432 unsigned int ts;
2433
2434 /*
2435 * Read an initialization vector data field.
2436 */
2437 p = __archive_read_ahead(a, 2, NULL);
2438 if (p == NULL)
2439 goto truncated;
2440 ts = zip->iv_size;
2441 zip->iv_size = archive_le16dec(p);
2442 __archive_read_consume(a, 2);
2443 if (ts < zip->iv_size) {
2444 free(zip->iv);
2445 zip->iv = NULL;
2446 }
2447 p = __archive_read_ahead(a, zip->iv_size, NULL);
2448 if (p == NULL)
2449 goto truncated;
2450 if (zip->iv == NULL) {
2451 zip->iv = malloc(zip->iv_size);
2452 if (zip->iv == NULL)
2453 goto nomem;
2454 }
2455 memcpy(zip->iv, p, zip->iv_size);
2456 __archive_read_consume(a, zip->iv_size);
2457
2458 /*
2459 * Read a size of remaining decryption header field.
2460 */
2461 p = __archive_read_ahead(a, 14, NULL);
2462 if (p == NULL)
2463 goto truncated;
2464 remaining_size = archive_le32dec(p);
2465 if (remaining_size < 16 || remaining_size > (1 << 18))
2466 goto corrupted;
2467
2468 /* Check if format version is supported. */
2469 if (archive_le16dec(p+4) != 3) {
2470 archive_set_error(&a->archive,
2471 ARCHIVE_ERRNO_FILE_FORMAT,
2472 "Unsupported encryption format version: %u",
2473 archive_le16dec(p+4));
2474 return (ARCHIVE_FAILED);
2475 }
2476
2477 /*
2478 * Read an encryption algorithm field.
2479 */
2480 zip->alg_id = archive_le16dec(p+6);
2481 switch (zip->alg_id) {
2482 case 0x6601:/* DES */
2483 case 0x6602:/* RC2 */
2484 case 0x6603:/* 3DES 168 */
2485 case 0x6609:/* 3DES 112 */
2486 case 0x660E:/* AES 128 */
2487 case 0x660F:/* AES 192 */
2488 case 0x6610:/* AES 256 */
2489 case 0x6702:/* RC2 (version >= 5.2) */
2490 case 0x6720:/* Blowfish */
2491 case 0x6721:/* Twofish */
2492 case 0x6801:/* RC4 */
2493 /* Supported encryption algorithm. */
2494 break;
2495 default:
2496 archive_set_error(&a->archive,
2497 ARCHIVE_ERRNO_FILE_FORMAT,
2498 "Unknown encryption algorithm: %u", zip->alg_id);
2499 return (ARCHIVE_FAILED);
2500 }
2501
2502 /*
2503 * Read a bit length field.
2504 */
2505 zip->bit_len = archive_le16dec(p+8);
2506
2507 /*
2508 * Read a flags field.
2509 */
2510 zip->flags = archive_le16dec(p+10);
2511 switch (zip->flags & 0xf000) {
2512 case 0x0001: /* Password is required to decrypt. */
2513 case 0x0002: /* Certificates only. */
2514 case 0x0003: /* Password or certificate required to decrypt. */
2515 break;
2516 default:
2517 archive_set_error(&a->archive,
2518 ARCHIVE_ERRNO_FILE_FORMAT,
2519 "Unknown encryption flag: %u", zip->flags);
2520 return (ARCHIVE_FAILED);
2521 }
2522 if ((zip->flags & 0xf000) == 0 ||
2523 (zip->flags & 0xf000) == 0x4000) {
2524 archive_set_error(&a->archive,
2525 ARCHIVE_ERRNO_FILE_FORMAT,
2526 "Unknown encryption flag: %u", zip->flags);
2527 return (ARCHIVE_FAILED);
2528 }
2529
2530 /*
2531 * Read an encrypted random data field.
2532 */
2533 ts = zip->erd_size;
2534 zip->erd_size = archive_le16dec(p+12);
2535 __archive_read_consume(a, 14);
2536 if ((zip->erd_size & 0xf) != 0 ||
2537 (zip->erd_size + 16) > remaining_size ||
2538 (zip->erd_size + 16) < zip->erd_size)
2539 goto corrupted;
2540
2541 if (ts < zip->erd_size) {
2542 free(zip->erd);
2543 zip->erd = NULL;
2544 }
2545 p = __archive_read_ahead(a, zip->erd_size, NULL);
2546 if (p == NULL)
2547 goto truncated;
2548 if (zip->erd == NULL) {
2549 zip->erd = malloc(zip->erd_size);
2550 if (zip->erd == NULL)
2551 goto nomem;
2552 }
2553 memcpy(zip->erd, p, zip->erd_size);
2554 __archive_read_consume(a, zip->erd_size);
2555
2556 /*
2557 * Read a reserved data field.
2558 */
2559 p = __archive_read_ahead(a, 4, NULL);
2560 if (p == NULL)
2561 goto truncated;
2562 /* Reserved data size should be zero. */
2563 if (archive_le32dec(p) != 0)
2564 goto corrupted;
2565 __archive_read_consume(a, 4);
2566
2567 /*
2568 * Read a password validation data field.
2569 */
2570 p = __archive_read_ahead(a, 2, NULL);
2571 if (p == NULL)
2572 goto truncated;
2573 ts = zip->v_size;
2574 zip->v_size = archive_le16dec(p);
2575 __archive_read_consume(a, 2);
2576 if ((zip->v_size & 0x0f) != 0 ||
2577 (zip->erd_size + zip->v_size + 16) > remaining_size ||
2578 (zip->erd_size + zip->v_size + 16) < (zip->erd_size + zip->v_size))
2579 goto corrupted;
2580 if (ts < zip->v_size) {
2581 free(zip->v_data);
2582 zip->v_data = NULL;
2583 }
2584 p = __archive_read_ahead(a, zip->v_size, NULL);
2585 if (p == NULL)
2586 goto truncated;
2587 if (zip->v_data == NULL) {
2588 zip->v_data = malloc(zip->v_size);
2589 if (zip->v_data == NULL)
2590 goto nomem;
2591 }
2592 memcpy(zip->v_data, p, zip->v_size);
2593 __archive_read_consume(a, zip->v_size);
2594
2595 p = __archive_read_ahead(a, 4, NULL);
2596 if (p == NULL)
2597 goto truncated;
2598 zip->v_crc32 = archive_le32dec(p);
2599 __archive_read_consume(a, 4);
2600
2601 /*return (ARCHIVE_OK);
2602 * This is not fully implemented yet.*/
2603 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2604 "Encrypted file is unsupported");
2605 return (ARCHIVE_FAILED);
2606 truncated:
2607 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2608 "Truncated ZIP file data");
2609 return (ARCHIVE_FATAL);
2610 corrupted:
2611 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2612 "Corrupted ZIP file data");
2613 return (ARCHIVE_FATAL);
2614 nomem:
2615 archive_set_error(&a->archive, ENOMEM,
2616 "No memory for ZIP decryption");
2617 return (ARCHIVE_FATAL);
2618 }
2619
2620 static int
zip_alloc_decryption_buffer(struct archive_read * a)2621 zip_alloc_decryption_buffer(struct archive_read *a)
2622 {
2623 struct zip *zip = (struct zip *)(a->format->data);
2624 size_t bs = 256 * 1024;
2625
2626 if (zip->decrypted_buffer == NULL) {
2627 zip->decrypted_buffer_size = bs;
2628 zip->decrypted_buffer = malloc(bs);
2629 if (zip->decrypted_buffer == NULL) {
2630 archive_set_error(&a->archive, ENOMEM,
2631 "No memory for ZIP decryption");
2632 return (ARCHIVE_FATAL);
2633 }
2634 }
2635 zip->decrypted_ptr = zip->decrypted_buffer;
2636 return (ARCHIVE_OK);
2637 }
2638
2639 static int
init_traditional_PKWARE_decryption(struct archive_read * a)2640 init_traditional_PKWARE_decryption(struct archive_read *a)
2641 {
2642 struct zip *zip = (struct zip *)(a->format->data);
2643 const void *p;
2644 int retry;
2645 int r;
2646
2647 if (zip->tctx_valid)
2648 return (ARCHIVE_OK);
2649
2650 /*
2651 Read the 12 bytes encryption header stored at
2652 the start of the data area.
2653 */
2654 #define ENC_HEADER_SIZE 12
2655 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2656 && zip->entry_bytes_remaining < ENC_HEADER_SIZE) {
2657 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2658 "Truncated Zip encrypted body: only %jd bytes available",
2659 (intmax_t)zip->entry_bytes_remaining);
2660 return (ARCHIVE_FATAL);
2661 }
2662
2663 p = __archive_read_ahead(a, ENC_HEADER_SIZE, NULL);
2664 if (p == NULL) {
2665 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2666 "Truncated ZIP file data");
2667 return (ARCHIVE_FATAL);
2668 }
2669
2670 for (retry = 0;; retry++) {
2671 const char *passphrase;
2672 uint8_t crcchk;
2673
2674 passphrase = __archive_read_next_passphrase(a);
2675 if (passphrase == NULL) {
2676 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2677 (retry > 0)?
2678 "Incorrect passphrase":
2679 "Passphrase required for this entry");
2680 return (ARCHIVE_FAILED);
2681 }
2682
2683 /*
2684 * Initialize ctx for Traditional PKWARE Decryption.
2685 */
2686 r = trad_enc_init(&zip->tctx, passphrase, strlen(passphrase),
2687 p, ENC_HEADER_SIZE, &crcchk);
2688 if (r == 0 && crcchk == zip->entry->decdat)
2689 break;/* The passphrase is OK. */
2690 if (retry > 10000) {
2691 /* Avoid infinity loop. */
2692 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2693 "Too many incorrect passphrases");
2694 return (ARCHIVE_FAILED);
2695 }
2696 }
2697
2698 __archive_read_consume(a, ENC_HEADER_SIZE);
2699 zip->tctx_valid = 1;
2700 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)) {
2701 zip->entry_bytes_remaining -= ENC_HEADER_SIZE;
2702 }
2703 /*zip->entry_uncompressed_bytes_read += ENC_HEADER_SIZE;*/
2704 zip->entry_compressed_bytes_read += ENC_HEADER_SIZE;
2705 zip->decrypted_bytes_remaining = 0;
2706
2707 return (zip_alloc_decryption_buffer(a));
2708 #undef ENC_HEADER_SIZE
2709 }
2710
2711 static int
init_WinZip_AES_decryption(struct archive_read * a)2712 init_WinZip_AES_decryption(struct archive_read *a)
2713 {
2714 struct zip *zip = (struct zip *)(a->format->data);
2715 const void *p;
2716 const uint8_t *pv;
2717 size_t key_len, salt_len;
2718 uint8_t derived_key[MAX_DERIVED_KEY_BUF_SIZE];
2719 int retry;
2720 int r;
2721
2722 if (zip->cctx_valid || zip->hctx_valid)
2723 return (ARCHIVE_OK);
2724
2725 switch (zip->entry->aes_extra.strength) {
2726 case 1: salt_len = 8; key_len = 16; break;
2727 case 2: salt_len = 12; key_len = 24; break;
2728 case 3: salt_len = 16; key_len = 32; break;
2729 default: goto corrupted;
2730 }
2731 p = __archive_read_ahead(a, salt_len + 2, NULL);
2732 if (p == NULL)
2733 goto truncated;
2734
2735 for (retry = 0;; retry++) {
2736 const char *passphrase;
2737
2738 passphrase = __archive_read_next_passphrase(a);
2739 if (passphrase == NULL) {
2740 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2741 (retry > 0)?
2742 "Incorrect passphrase":
2743 "Passphrase required for this entry");
2744 return (ARCHIVE_FAILED);
2745 }
2746 memset(derived_key, 0, sizeof(derived_key));
2747 r = archive_pbkdf2_sha1(passphrase, strlen(passphrase),
2748 p, salt_len, 1000, derived_key, key_len * 2 + 2);
2749 if (r != 0) {
2750 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2751 "Decryption is unsupported due to lack of "
2752 "crypto library");
2753 return (ARCHIVE_FAILED);
2754 }
2755
2756 /* Check password verification value. */
2757 pv = ((const uint8_t *)p) + salt_len;
2758 if (derived_key[key_len * 2] == pv[0] &&
2759 derived_key[key_len * 2 + 1] == pv[1])
2760 break;/* The passphrase is OK. */
2761 if (retry > 10000) {
2762 /* Avoid infinity loop. */
2763 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2764 "Too many incorrect passphrases");
2765 return (ARCHIVE_FAILED);
2766 }
2767 }
2768
2769 r = archive_decrypto_aes_ctr_init(&zip->cctx, derived_key, key_len);
2770 if (r != 0) {
2771 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2772 "Decryption is unsupported due to lack of crypto library");
2773 return (ARCHIVE_FAILED);
2774 }
2775 r = archive_hmac_sha1_init(&zip->hctx, derived_key + key_len, key_len);
2776 if (r != 0) {
2777 archive_decrypto_aes_ctr_release(&zip->cctx);
2778 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2779 "Failed to initialize HMAC-SHA1");
2780 return (ARCHIVE_FAILED);
2781 }
2782 zip->cctx_valid = zip->hctx_valid = 1;
2783 __archive_read_consume(a, salt_len + 2);
2784 zip->entry_bytes_remaining -= salt_len + 2 + AUTH_CODE_SIZE;
2785 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
2786 && zip->entry_bytes_remaining < 0)
2787 goto corrupted;
2788 zip->entry_compressed_bytes_read += salt_len + 2 + AUTH_CODE_SIZE;
2789 zip->decrypted_bytes_remaining = 0;
2790
2791 zip->entry->compression = zip->entry->aes_extra.compression;
2792 return (zip_alloc_decryption_buffer(a));
2793
2794 truncated:
2795 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2796 "Truncated ZIP file data");
2797 return (ARCHIVE_FATAL);
2798 corrupted:
2799 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2800 "Corrupted ZIP file data");
2801 return (ARCHIVE_FATAL);
2802 }
2803
2804 static int
archive_read_format_zip_read_data(struct archive_read * a,const void ** buff,size_t * size,int64_t * offset)2805 archive_read_format_zip_read_data(struct archive_read *a,
2806 const void **buff, size_t *size, int64_t *offset)
2807 {
2808 int r;
2809 struct zip *zip = (struct zip *)(a->format->data);
2810
2811 if (zip->has_encrypted_entries ==
2812 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW) {
2813 zip->has_encrypted_entries = 0;
2814 }
2815
2816 *offset = zip->entry_uncompressed_bytes_read;
2817 *size = 0;
2818 *buff = NULL;
2819
2820 /* If we hit end-of-entry last time, return ARCHIVE_EOF. */
2821 if (zip->end_of_entry)
2822 return (ARCHIVE_EOF);
2823
2824 /* Return EOF immediately if this is a non-regular file. */
2825 if (AE_IFREG != (zip->entry->mode & AE_IFMT))
2826 return (ARCHIVE_EOF);
2827
2828 __archive_read_consume(a, zip->unconsumed);
2829 zip->unconsumed = 0;
2830
2831 if (zip->init_decryption) {
2832 zip->has_encrypted_entries = 1;
2833 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
2834 r = read_decryption_header(a);
2835 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
2836 r = init_WinZip_AES_decryption(a);
2837 else
2838 r = init_traditional_PKWARE_decryption(a);
2839 if (r != ARCHIVE_OK)
2840 return (r);
2841 zip->init_decryption = 0;
2842 }
2843
2844 switch(zip->entry->compression) {
2845 case 0: /* No compression. */
2846 r = zip_read_data_none(a, buff, size, offset);
2847 break;
2848 #ifdef HAVE_BZLIB_H
2849 case 12: /* ZIPx bzip2 compression. */
2850 r = zip_read_data_zipx_bzip2(a, buff, size, offset);
2851 break;
2852 #endif
2853 #if HAVE_LZMA_H && HAVE_LIBLZMA
2854 case 14: /* ZIPx LZMA compression. */
2855 r = zip_read_data_zipx_lzma_alone(a, buff, size, offset);
2856 break;
2857 case 95: /* ZIPx XZ compression. */
2858 r = zip_read_data_zipx_xz(a, buff, size, offset);
2859 break;
2860 #endif
2861 /* PPMd support is built-in, so we don't need any #if guards. */
2862 case 98: /* ZIPx PPMd compression. */
2863 r = zip_read_data_zipx_ppmd(a, buff, size, offset);
2864 break;
2865
2866 #ifdef HAVE_ZLIB_H
2867 case 8: /* Deflate compression. */
2868 r = zip_read_data_deflate(a, buff, size, offset);
2869 break;
2870 #endif
2871 default: /* Unsupported compression. */
2872 /* Return a warning. */
2873 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
2874 "Unsupported ZIP compression method (%d: %s)",
2875 zip->entry->compression, compression_name(zip->entry->compression));
2876 /* We can't decompress this entry, but we will
2877 * be able to skip() it and try the next entry. */
2878 return (ARCHIVE_FAILED);
2879 break;
2880 }
2881 if (r != ARCHIVE_OK)
2882 return (r);
2883 /* Update checksum */
2884 if (*size)
2885 zip->entry_crc32 = zip->crc32func(zip->entry_crc32, *buff,
2886 (unsigned)*size);
2887 /* If we hit the end, swallow any end-of-data marker. */
2888 if (zip->end_of_entry) {
2889 /* Check file size, CRC against these values. */
2890 if (zip->entry->compressed_size !=
2891 zip->entry_compressed_bytes_read) {
2892 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2893 "ZIP compressed data is wrong size "
2894 "(read %jd, expected %jd)",
2895 (intmax_t)zip->entry_compressed_bytes_read,
2896 (intmax_t)zip->entry->compressed_size);
2897 return (ARCHIVE_WARN);
2898 }
2899 /* Size field only stores the lower 32 bits of the actual
2900 * size. */
2901 if ((zip->entry->uncompressed_size & UINT32_MAX)
2902 != (zip->entry_uncompressed_bytes_read & UINT32_MAX)) {
2903 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2904 "ZIP uncompressed data is wrong size "
2905 "(read %jd, expected %jd)\n",
2906 (intmax_t)zip->entry_uncompressed_bytes_read,
2907 (intmax_t)zip->entry->uncompressed_size);
2908 return (ARCHIVE_WARN);
2909 }
2910 /* Check computed CRC against header */
2911 if ((!zip->hctx_valid ||
2912 zip->entry->aes_extra.vendor != AES_VENDOR_AE_2) &&
2913 zip->entry->crc32 != zip->entry_crc32
2914 && !zip->ignore_crc32) {
2915 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
2916 "ZIP bad CRC: 0x%lx should be 0x%lx",
2917 (unsigned long)zip->entry_crc32,
2918 (unsigned long)zip->entry->crc32);
2919 return (ARCHIVE_WARN);
2920 }
2921 }
2922
2923 return (ARCHIVE_OK);
2924 }
2925
2926 static int
archive_read_format_zip_cleanup(struct archive_read * a)2927 archive_read_format_zip_cleanup(struct archive_read *a)
2928 {
2929 struct zip *zip;
2930 struct zip_entry *zip_entry, *next_zip_entry;
2931
2932 zip = (struct zip *)(a->format->data);
2933
2934 #ifdef HAVE_ZLIB_H
2935 if (zip->stream_valid)
2936 inflateEnd(&zip->stream);
2937 #endif
2938
2939 #if HAVE_LZMA_H && HAVE_LIBLZMA
2940 if (zip->zipx_lzma_valid) {
2941 lzma_end(&zip->zipx_lzma_stream);
2942 }
2943 #endif
2944
2945 #ifdef HAVE_BZLIB_H
2946 if (zip->bzstream_valid) {
2947 BZ2_bzDecompressEnd(&zip->bzstream);
2948 }
2949 #endif
2950
2951 free(zip->uncompressed_buffer);
2952
2953 if (zip->ppmd8_valid)
2954 __archive_ppmd8_functions.Ppmd8_Free(&zip->ppmd8);
2955
2956 if (zip->zip_entries) {
2957 zip_entry = zip->zip_entries;
2958 while (zip_entry != NULL) {
2959 next_zip_entry = zip_entry->next;
2960 archive_string_free(&zip_entry->rsrcname);
2961 free(zip_entry);
2962 zip_entry = next_zip_entry;
2963 }
2964 }
2965 free(zip->decrypted_buffer);
2966 if (zip->cctx_valid)
2967 archive_decrypto_aes_ctr_release(&zip->cctx);
2968 if (zip->hctx_valid)
2969 archive_hmac_sha1_cleanup(&zip->hctx);
2970 free(zip->iv);
2971 free(zip->erd);
2972 free(zip->v_data);
2973 archive_string_free(&zip->format_name);
2974 free(zip);
2975 (a->format->data) = NULL;
2976 return (ARCHIVE_OK);
2977 }
2978
2979 static int
archive_read_format_zip_has_encrypted_entries(struct archive_read * _a)2980 archive_read_format_zip_has_encrypted_entries(struct archive_read *_a)
2981 {
2982 if (_a && _a->format) {
2983 struct zip * zip = (struct zip *)_a->format->data;
2984 if (zip) {
2985 return zip->has_encrypted_entries;
2986 }
2987 }
2988 return ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
2989 }
2990
2991 static int
archive_read_format_zip_options(struct archive_read * a,const char * key,const char * val)2992 archive_read_format_zip_options(struct archive_read *a,
2993 const char *key, const char *val)
2994 {
2995 struct zip *zip;
2996 int ret = ARCHIVE_FAILED;
2997
2998 zip = (struct zip *)(a->format->data);
2999 if (strcmp(key, "compat-2x") == 0) {
3000 /* Handle filenames as libarchive 2.x */
3001 zip->init_default_conversion = (val != NULL) ? 1 : 0;
3002 return (ARCHIVE_OK);
3003 } else if (strcmp(key, "hdrcharset") == 0) {
3004 if (val == NULL || val[0] == 0)
3005 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
3006 "zip: hdrcharset option needs a character-set name"
3007 );
3008 else {
3009 zip->sconv = archive_string_conversion_from_charset(
3010 &a->archive, val, 0);
3011 if (zip->sconv != NULL) {
3012 if (strcmp(val, "UTF-8") == 0)
3013 zip->sconv_utf8 = zip->sconv;
3014 ret = ARCHIVE_OK;
3015 } else
3016 ret = ARCHIVE_FATAL;
3017 }
3018 return (ret);
3019 } else if (strcmp(key, "ignorecrc32") == 0) {
3020 /* Mostly useful for testing. */
3021 if (val == NULL || val[0] == 0) {
3022 zip->crc32func = real_crc32;
3023 zip->ignore_crc32 = 0;
3024 } else {
3025 zip->crc32func = fake_crc32;
3026 zip->ignore_crc32 = 1;
3027 }
3028 return (ARCHIVE_OK);
3029 } else if (strcmp(key, "mac-ext") == 0) {
3030 zip->process_mac_extensions = (val != NULL && val[0] != 0);
3031 return (ARCHIVE_OK);
3032 }
3033
3034 /* Note: The "warn" return is just to inform the options
3035 * supervisor that we didn't handle it. It will generate
3036 * a suitable error if no one used this option. */
3037 return (ARCHIVE_WARN);
3038 }
3039
3040 int
archive_read_support_format_zip(struct archive * a)3041 archive_read_support_format_zip(struct archive *a)
3042 {
3043 int r;
3044 r = archive_read_support_format_zip_streamable(a);
3045 if (r != ARCHIVE_OK)
3046 return r;
3047 return (archive_read_support_format_zip_seekable(a));
3048 }
3049
3050 /* ------------------------------------------------------------------------ */
3051
3052 /*
3053 * Streaming-mode support
3054 */
3055
3056
3057 static int
archive_read_support_format_zip_capabilities_streamable(struct archive_read * a)3058 archive_read_support_format_zip_capabilities_streamable(struct archive_read * a)
3059 {
3060 (void)a; /* UNUSED */
3061 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
3062 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
3063 }
3064
3065 static int
archive_read_format_zip_streamable_bid(struct archive_read * a,int best_bid)3066 archive_read_format_zip_streamable_bid(struct archive_read *a, int best_bid)
3067 {
3068 const char *p;
3069
3070 (void)best_bid; /* UNUSED */
3071
3072 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
3073 return (-1);
3074
3075 /*
3076 * Bid of 29 here comes from:
3077 * + 16 bits for "PK",
3078 * + next 16-bit field has 6 options so contributes
3079 * about 16 - log_2(6) ~= 16 - 2.6 ~= 13 bits
3080 *
3081 * So we've effectively verified ~29 total bits of check data.
3082 */
3083 if (p[0] == 'P' && p[1] == 'K') {
3084 if ((p[2] == '\001' && p[3] == '\002')
3085 || (p[2] == '\003' && p[3] == '\004')
3086 || (p[2] == '\005' && p[3] == '\006')
3087 || (p[2] == '\006' && p[3] == '\006')
3088 || (p[2] == '\007' && p[3] == '\010')
3089 || (p[2] == '0' && p[3] == '0'))
3090 return (29);
3091 }
3092
3093 /* TODO: It's worth looking ahead a little bit for a valid
3094 * PK signature. In particular, that would make it possible
3095 * to read some UUEncoded SFX files or SFX files coming from
3096 * a network socket. */
3097
3098 return (0);
3099 }
3100
3101 static int
archive_read_format_zip_streamable_read_header(struct archive_read * a,struct archive_entry * entry)3102 archive_read_format_zip_streamable_read_header(struct archive_read *a,
3103 struct archive_entry *entry)
3104 {
3105 struct zip *zip;
3106
3107 a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
3108 if (a->archive.archive_format_name == NULL)
3109 a->archive.archive_format_name = "ZIP";
3110
3111 zip = (struct zip *)(a->format->data);
3112
3113 /*
3114 * It should be sufficient to call archive_read_next_header() for
3115 * a reader to determine if an entry is encrypted or not. If the
3116 * encryption of an entry is only detectable when calling
3117 * archive_read_data(), so be it. We'll do the same check there
3118 * as well.
3119 */
3120 if (zip->has_encrypted_entries ==
3121 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
3122 zip->has_encrypted_entries = 0;
3123
3124 /* Make sure we have a zip_entry structure to use. */
3125 if (zip->zip_entries == NULL) {
3126 zip->zip_entries = malloc(sizeof(struct zip_entry));
3127 if (zip->zip_entries == NULL) {
3128 archive_set_error(&a->archive, ENOMEM,
3129 "Out of memory");
3130 return ARCHIVE_FATAL;
3131 }
3132 }
3133 zip->entry = zip->zip_entries;
3134 memset(zip->entry, 0, sizeof(struct zip_entry));
3135
3136 if (zip->cctx_valid)
3137 archive_decrypto_aes_ctr_release(&zip->cctx);
3138 if (zip->hctx_valid)
3139 archive_hmac_sha1_cleanup(&zip->hctx);
3140 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
3141 __archive_read_reset_passphrase(a);
3142
3143 /* Search ahead for the next local file header. */
3144 __archive_read_consume(a, zip->unconsumed);
3145 zip->unconsumed = 0;
3146 for (;;) {
3147 int64_t skipped = 0;
3148 const char *p, *end;
3149 ssize_t bytes;
3150
3151 p = __archive_read_ahead(a, 4, &bytes);
3152 if (p == NULL)
3153 return (ARCHIVE_FATAL);
3154 end = p + bytes;
3155
3156 while (p + 4 <= end) {
3157 if (p[0] == 'P' && p[1] == 'K') {
3158 if (p[2] == '\003' && p[3] == '\004') {
3159 /* Regular file entry. */
3160 __archive_read_consume(a, skipped);
3161 return zip_read_local_file_header(a,
3162 entry, zip);
3163 }
3164
3165 /*
3166 * TODO: We cannot restore permissions
3167 * based only on the local file headers.
3168 * Consider scanning the central
3169 * directory and returning additional
3170 * entries for at least directories.
3171 * This would allow us to properly set
3172 * directory permissions.
3173 *
3174 * This won't help us fix symlinks
3175 * and may not help with regular file
3176 * permissions, either. <sigh>
3177 */
3178 if (p[2] == '\001' && p[3] == '\002') {
3179 return (ARCHIVE_EOF);
3180 }
3181
3182 /* End of central directory? Must be an
3183 * empty archive. */
3184 if ((p[2] == '\005' && p[3] == '\006')
3185 || (p[2] == '\006' && p[3] == '\006'))
3186 return (ARCHIVE_EOF);
3187 }
3188 ++p;
3189 ++skipped;
3190 }
3191 __archive_read_consume(a, skipped);
3192 }
3193 }
3194
3195 static int
archive_read_format_zip_read_data_skip_streamable(struct archive_read * a)3196 archive_read_format_zip_read_data_skip_streamable(struct archive_read *a)
3197 {
3198 struct zip *zip;
3199 int64_t bytes_skipped;
3200
3201 zip = (struct zip *)(a->format->data);
3202 bytes_skipped = __archive_read_consume(a, zip->unconsumed);
3203 zip->unconsumed = 0;
3204 if (bytes_skipped < 0)
3205 return (ARCHIVE_FATAL);
3206
3207 /* If we've already read to end of data, we're done. */
3208 if (zip->end_of_entry)
3209 return (ARCHIVE_OK);
3210
3211 /* So we know we're streaming... */
3212 if (0 == (zip->entry->zip_flags & ZIP_LENGTH_AT_END)
3213 || zip->entry->compressed_size > 0) {
3214 /* We know the compressed length, so we can just skip. */
3215 bytes_skipped = __archive_read_consume(a,
3216 zip->entry_bytes_remaining);
3217 if (bytes_skipped < 0)
3218 return (ARCHIVE_FATAL);
3219 return (ARCHIVE_OK);
3220 }
3221
3222 if (zip->init_decryption) {
3223 int r;
3224
3225 zip->has_encrypted_entries = 1;
3226 if (zip->entry->zip_flags & ZIP_STRONG_ENCRYPTED)
3227 r = read_decryption_header(a);
3228 else if (zip->entry->compression == WINZIP_AES_ENCRYPTION)
3229 r = init_WinZip_AES_decryption(a);
3230 else
3231 r = init_traditional_PKWARE_decryption(a);
3232 if (r != ARCHIVE_OK)
3233 return (r);
3234 zip->init_decryption = 0;
3235 }
3236
3237 /* We're streaming and we don't know the length. */
3238 /* If the body is compressed and we know the format, we can
3239 * find an exact end-of-entry by decompressing it. */
3240 switch (zip->entry->compression) {
3241 #ifdef HAVE_ZLIB_H
3242 case 8: /* Deflate compression. */
3243 while (!zip->end_of_entry) {
3244 int64_t offset = 0;
3245 const void *buff = NULL;
3246 size_t size = 0;
3247 int r;
3248 r = zip_read_data_deflate(a, &buff, &size, &offset);
3249 if (r != ARCHIVE_OK)
3250 return (r);
3251 }
3252 return ARCHIVE_OK;
3253 #endif
3254 default: /* Uncompressed or unknown. */
3255 /* Scan for a PK\007\010 signature. */
3256 for (;;) {
3257 const char *p, *buff;
3258 ssize_t bytes_avail;
3259 buff = __archive_read_ahead(a, 16, &bytes_avail);
3260 if (bytes_avail < 16) {
3261 archive_set_error(&a->archive,
3262 ARCHIVE_ERRNO_FILE_FORMAT,
3263 "Truncated ZIP file data");
3264 return (ARCHIVE_FATAL);
3265 }
3266 p = buff;
3267 while (p <= buff + bytes_avail - 16) {
3268 if (p[3] == 'P') { p += 3; }
3269 else if (p[3] == 'K') { p += 2; }
3270 else if (p[3] == '\007') { p += 1; }
3271 else if (p[3] == '\010' && p[2] == '\007'
3272 && p[1] == 'K' && p[0] == 'P') {
3273 if (zip->entry->flags & LA_USED_ZIP64)
3274 __archive_read_consume(a,
3275 p - buff + 24);
3276 else
3277 __archive_read_consume(a,
3278 p - buff + 16);
3279 return ARCHIVE_OK;
3280 } else { p += 4; }
3281 }
3282 __archive_read_consume(a, p - buff);
3283 }
3284 }
3285 }
3286
3287 int
archive_read_support_format_zip_streamable(struct archive * _a)3288 archive_read_support_format_zip_streamable(struct archive *_a)
3289 {
3290 struct archive_read *a = (struct archive_read *)_a;
3291 struct zip *zip;
3292 int r;
3293
3294 archive_check_magic(_a, ARCHIVE_READ_MAGIC,
3295 ARCHIVE_STATE_NEW, "archive_read_support_format_zip");
3296
3297 zip = (struct zip *)calloc(1, sizeof(*zip));
3298 if (zip == NULL) {
3299 archive_set_error(&a->archive, ENOMEM,
3300 "Can't allocate zip data");
3301 return (ARCHIVE_FATAL);
3302 }
3303
3304 /* Streamable reader doesn't support mac extensions. */
3305 zip->process_mac_extensions = 0;
3306
3307 /*
3308 * Until enough data has been read, we cannot tell about
3309 * any encrypted entries yet.
3310 */
3311 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
3312 zip->crc32func = real_crc32;
3313
3314 r = __archive_read_register_format(a,
3315 zip,
3316 "zip",
3317 archive_read_format_zip_streamable_bid,
3318 archive_read_format_zip_options,
3319 archive_read_format_zip_streamable_read_header,
3320 archive_read_format_zip_read_data,
3321 archive_read_format_zip_read_data_skip_streamable,
3322 NULL,
3323 archive_read_format_zip_cleanup,
3324 archive_read_support_format_zip_capabilities_streamable,
3325 archive_read_format_zip_has_encrypted_entries);
3326
3327 if (r != ARCHIVE_OK)
3328 free(zip);
3329 return (ARCHIVE_OK);
3330 }
3331
3332 /* ------------------------------------------------------------------------ */
3333
3334 /*
3335 * Seeking-mode support
3336 */
3337
3338 static int
archive_read_support_format_zip_capabilities_seekable(struct archive_read * a)3339 archive_read_support_format_zip_capabilities_seekable(struct archive_read * a)
3340 {
3341 (void)a; /* UNUSED */
3342 return (ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_DATA |
3343 ARCHIVE_READ_FORMAT_CAPS_ENCRYPT_METADATA);
3344 }
3345
3346 /*
3347 * TODO: This is a performance sink because it forces the read core to
3348 * drop buffered data from the start of file, which will then have to
3349 * be re-read again if this bidder loses.
3350 *
3351 * We workaround this a little by passing in the best bid so far so
3352 * that later bidders can do nothing if they know they'll never
3353 * outbid. But we can certainly do better...
3354 */
3355 static int
read_eocd(struct zip * zip,const char * p,int64_t current_offset)3356 read_eocd(struct zip *zip, const char *p, int64_t current_offset)
3357 {
3358 uint16_t disk_num;
3359 uint32_t cd_size, cd_offset;
3360
3361 disk_num = archive_le16dec(p + 4);
3362 cd_size = archive_le32dec(p + 12);
3363 cd_offset = archive_le32dec(p + 16);
3364
3365 /* Sanity-check the EOCD we've found. */
3366
3367 /* This must be the first volume. */
3368 if (disk_num != 0)
3369 return 0;
3370 /* Central directory must be on this volume. */
3371 if (disk_num != archive_le16dec(p + 6))
3372 return 0;
3373 /* All central directory entries must be on this volume. */
3374 if (archive_le16dec(p + 10) != archive_le16dec(p + 8))
3375 return 0;
3376 /* Central directory can't extend beyond start of EOCD record. */
3377 if (cd_offset + cd_size > current_offset)
3378 return 0;
3379
3380 /* Save the central directory location for later use. */
3381 zip->central_directory_offset = cd_offset;
3382 zip->central_directory_offset_adjusted = current_offset - cd_size;
3383
3384 /* This is just a tiny bit higher than the maximum
3385 returned by the streaming Zip bidder. This ensures
3386 that the more accurate seeking Zip parser wins
3387 whenever seek is available. */
3388 return 32;
3389 }
3390
3391 /*
3392 * Examine Zip64 EOCD locator: If it's valid, store the information
3393 * from it.
3394 */
3395 static int
read_zip64_eocd(struct archive_read * a,struct zip * zip,const char * p)3396 read_zip64_eocd(struct archive_read *a, struct zip *zip, const char *p)
3397 {
3398 int64_t eocd64_offset;
3399 int64_t eocd64_size;
3400
3401 /* Sanity-check the locator record. */
3402
3403 /* Central dir must be on first volume. */
3404 if (archive_le32dec(p + 4) != 0)
3405 return 0;
3406 /* Must be only a single volume. */
3407 if (archive_le32dec(p + 16) != 1)
3408 return 0;
3409
3410 /* Find the Zip64 EOCD record. */
3411 eocd64_offset = archive_le64dec(p + 8);
3412 if (__archive_read_seek(a, eocd64_offset, SEEK_SET) < 0)
3413 return 0;
3414 if ((p = __archive_read_ahead(a, 56, NULL)) == NULL)
3415 return 0;
3416 /* Make sure we can read all of it. */
3417 eocd64_size = archive_le64dec(p + 4) + 12;
3418 if (eocd64_size < 56 || eocd64_size > 16384)
3419 return 0;
3420 if ((p = __archive_read_ahead(a, (size_t)eocd64_size, NULL)) == NULL)
3421 return 0;
3422
3423 /* Sanity-check the EOCD64 */
3424 if (archive_le32dec(p + 16) != 0) /* Must be disk #0 */
3425 return 0;
3426 if (archive_le32dec(p + 20) != 0) /* CD must be on disk #0 */
3427 return 0;
3428 /* CD can't be split. */
3429 if (archive_le64dec(p + 24) != archive_le64dec(p + 32))
3430 return 0;
3431
3432 /* Save the central directory offset for later use. */
3433 zip->central_directory_offset = archive_le64dec(p + 48);
3434 /* TODO: Needs scanning backwards to find the eocd64 instead of assuming */
3435 zip->central_directory_offset_adjusted = zip->central_directory_offset;
3436
3437 return 32;
3438 }
3439
3440 static int
archive_read_format_zip_seekable_bid(struct archive_read * a,int best_bid)3441 archive_read_format_zip_seekable_bid(struct archive_read *a, int best_bid)
3442 {
3443 struct zip *zip = (struct zip *)a->format->data;
3444 int64_t file_size, current_offset;
3445 const char *p;
3446 int i, tail;
3447
3448 /* If someone has already bid more than 32, then avoid
3449 trashing the look-ahead buffers with a seek. */
3450 if (best_bid > 32)
3451 return (-1);
3452
3453 file_size = __archive_read_seek(a, 0, SEEK_END);
3454 if (file_size <= 0)
3455 return 0;
3456
3457 /* Search last 16k of file for end-of-central-directory
3458 * record (which starts with PK\005\006) */
3459 tail = (int)zipmin(1024 * 16, file_size);
3460 current_offset = __archive_read_seek(a, -tail, SEEK_END);
3461 if (current_offset < 0)
3462 return 0;
3463 if ((p = __archive_read_ahead(a, (size_t)tail, NULL)) == NULL)
3464 return 0;
3465 /* Boyer-Moore search backwards from the end, since we want
3466 * to match the last EOCD in the file (there can be more than
3467 * one if there is an uncompressed Zip archive as a member
3468 * within this Zip archive). */
3469 for (i = tail - 22; i > 0;) {
3470 switch (p[i]) {
3471 case 'P':
3472 if (memcmp(p + i, "PK\005\006", 4) == 0) {
3473 int ret = read_eocd(zip, p + i,
3474 current_offset + i);
3475 /* Zip64 EOCD locator precedes
3476 * regular EOCD if present. */
3477 if (i >= 20 && memcmp(p + i - 20, "PK\006\007", 4) == 0) {
3478 int ret_zip64 = read_zip64_eocd(a, zip, p + i - 20);
3479 if (ret_zip64 > ret)
3480 ret = ret_zip64;
3481 }
3482 return (ret);
3483 }
3484 i -= 4;
3485 break;
3486 case 'K': i -= 1; break;
3487 case 005: i -= 2; break;
3488 case 006: i -= 3; break;
3489 default: i -= 4; break;
3490 }
3491 }
3492 return 0;
3493 }
3494
3495 /* The red-black trees are only used in seeking mode to manage
3496 * the in-memory copy of the central directory. */
3497
3498 static int
cmp_node(const struct archive_rb_node * n1,const struct archive_rb_node * n2)3499 cmp_node(const struct archive_rb_node *n1, const struct archive_rb_node *n2)
3500 {
3501 const struct zip_entry *e1 = (const struct zip_entry *)n1;
3502 const struct zip_entry *e2 = (const struct zip_entry *)n2;
3503
3504 if (e1->local_header_offset > e2->local_header_offset)
3505 return -1;
3506 if (e1->local_header_offset < e2->local_header_offset)
3507 return 1;
3508 return 0;
3509 }
3510
3511 static int
cmp_key(const struct archive_rb_node * n,const void * key)3512 cmp_key(const struct archive_rb_node *n, const void *key)
3513 {
3514 /* This function won't be called */
3515 (void)n; /* UNUSED */
3516 (void)key; /* UNUSED */
3517 return 1;
3518 }
3519
3520 static const struct archive_rb_tree_ops rb_ops = {
3521 &cmp_node, &cmp_key
3522 };
3523
3524 static int
rsrc_cmp_node(const struct archive_rb_node * n1,const struct archive_rb_node * n2)3525 rsrc_cmp_node(const struct archive_rb_node *n1,
3526 const struct archive_rb_node *n2)
3527 {
3528 const struct zip_entry *e1 = (const struct zip_entry *)n1;
3529 const struct zip_entry *e2 = (const struct zip_entry *)n2;
3530
3531 return (strcmp(e2->rsrcname.s, e1->rsrcname.s));
3532 }
3533
3534 static int
rsrc_cmp_key(const struct archive_rb_node * n,const void * key)3535 rsrc_cmp_key(const struct archive_rb_node *n, const void *key)
3536 {
3537 const struct zip_entry *e = (const struct zip_entry *)n;
3538 return (strcmp((const char *)key, e->rsrcname.s));
3539 }
3540
3541 static const struct archive_rb_tree_ops rb_rsrc_ops = {
3542 &rsrc_cmp_node, &rsrc_cmp_key
3543 };
3544
3545 static const char *
rsrc_basename(const char * name,size_t name_length)3546 rsrc_basename(const char *name, size_t name_length)
3547 {
3548 const char *s, *r;
3549
3550 r = s = name;
3551 for (;;) {
3552 s = memchr(s, '/', name_length - (s - name));
3553 if (s == NULL)
3554 break;
3555 r = ++s;
3556 }
3557 return (r);
3558 }
3559
3560 static void
expose_parent_dirs(struct zip * zip,const char * name,size_t name_length)3561 expose_parent_dirs(struct zip *zip, const char *name, size_t name_length)
3562 {
3563 struct archive_string str;
3564 struct zip_entry *dir;
3565 char *s;
3566
3567 archive_string_init(&str);
3568 archive_strncpy(&str, name, name_length);
3569 for (;;) {
3570 s = strrchr(str.s, '/');
3571 if (s == NULL)
3572 break;
3573 *s = '\0';
3574 /* Transfer the parent directory from zip->tree_rsrc RB
3575 * tree to zip->tree RB tree to expose. */
3576 dir = (struct zip_entry *)
3577 __archive_rb_tree_find_node(&zip->tree_rsrc, str.s);
3578 if (dir == NULL)
3579 break;
3580 __archive_rb_tree_remove_node(&zip->tree_rsrc, &dir->node);
3581 archive_string_free(&dir->rsrcname);
3582 __archive_rb_tree_insert_node(&zip->tree, &dir->node);
3583 }
3584 archive_string_free(&str);
3585 }
3586
3587 static int
slurp_central_directory(struct archive_read * a,struct archive_entry * entry,struct zip * zip)3588 slurp_central_directory(struct archive_read *a, struct archive_entry* entry,
3589 struct zip *zip)
3590 {
3591 ssize_t i;
3592 unsigned found;
3593 int64_t correction;
3594 ssize_t bytes_avail;
3595 const char *p;
3596
3597 /*
3598 * Find the start of the central directory. The end-of-CD
3599 * record has our starting point, but there are lots of
3600 * Zip archives which have had other data prepended to the
3601 * file, which makes the recorded offsets all too small.
3602 * So we search forward from the specified offset until we
3603 * find the real start of the central directory. Then we
3604 * know the correction we need to apply to account for leading
3605 * padding.
3606 */
3607 if (__archive_read_seek(a, zip->central_directory_offset_adjusted, SEEK_SET)
3608 < 0)
3609 return ARCHIVE_FATAL;
3610
3611 found = 0;
3612 while (!found) {
3613 if ((p = __archive_read_ahead(a, 20, &bytes_avail)) == NULL)
3614 return ARCHIVE_FATAL;
3615 for (found = 0, i = 0; !found && i < bytes_avail - 4;) {
3616 switch (p[i + 3]) {
3617 case 'P': i += 3; break;
3618 case 'K': i += 2; break;
3619 case 001: i += 1; break;
3620 case 002:
3621 if (memcmp(p + i, "PK\001\002", 4) == 0) {
3622 p += i;
3623 found = 1;
3624 } else
3625 i += 4;
3626 break;
3627 case 005: i += 1; break;
3628 case 006:
3629 if (memcmp(p + i, "PK\005\006", 4) == 0) {
3630 p += i;
3631 found = 1;
3632 } else if (memcmp(p + i, "PK\006\006", 4) == 0) {
3633 p += i;
3634 found = 1;
3635 } else
3636 i += 1;
3637 break;
3638 default: i += 4; break;
3639 }
3640 }
3641 __archive_read_consume(a, i);
3642 }
3643 correction = archive_filter_bytes(&a->archive, 0)
3644 - zip->central_directory_offset;
3645
3646 __archive_rb_tree_init(&zip->tree, &rb_ops);
3647 __archive_rb_tree_init(&zip->tree_rsrc, &rb_rsrc_ops);
3648
3649 zip->central_directory_entries_total = 0;
3650 while (1) {
3651 struct zip_entry *zip_entry;
3652 size_t filename_length, extra_length, comment_length;
3653 uint32_t external_attributes;
3654 const char *name, *r;
3655
3656 if ((p = __archive_read_ahead(a, 4, NULL)) == NULL)
3657 return ARCHIVE_FATAL;
3658 if (memcmp(p, "PK\006\006", 4) == 0
3659 || memcmp(p, "PK\005\006", 4) == 0) {
3660 break;
3661 } else if (memcmp(p, "PK\001\002", 4) != 0) {
3662 archive_set_error(&a->archive,
3663 -1, "Invalid central directory signature");
3664 return ARCHIVE_FATAL;
3665 }
3666 if ((p = __archive_read_ahead(a, 46, NULL)) == NULL)
3667 return ARCHIVE_FATAL;
3668
3669 zip_entry = calloc(1, sizeof(struct zip_entry));
3670 if (zip_entry == NULL) {
3671 archive_set_error(&a->archive, ENOMEM,
3672 "Can't allocate zip entry");
3673 return ARCHIVE_FATAL;
3674 }
3675 zip_entry->next = zip->zip_entries;
3676 zip_entry->flags |= LA_FROM_CENTRAL_DIRECTORY;
3677 zip->zip_entries = zip_entry;
3678 zip->central_directory_entries_total++;
3679
3680 /* version = p[4]; */
3681 zip_entry->system = p[5];
3682 /* version_required = archive_le16dec(p + 6); */
3683 zip_entry->zip_flags = archive_le16dec(p + 8);
3684 if (zip_entry->zip_flags
3685 & (ZIP_ENCRYPTED | ZIP_STRONG_ENCRYPTED)){
3686 zip->has_encrypted_entries = 1;
3687 }
3688 zip_entry->compression = (char)archive_le16dec(p + 10);
3689 zip_entry->mtime = zip_time(p + 12);
3690 zip_entry->crc32 = archive_le32dec(p + 16);
3691 if (zip_entry->zip_flags & ZIP_LENGTH_AT_END)
3692 zip_entry->decdat = p[13];
3693 else
3694 zip_entry->decdat = p[19];
3695 zip_entry->compressed_size = archive_le32dec(p + 20);
3696 zip_entry->uncompressed_size = archive_le32dec(p + 24);
3697 filename_length = archive_le16dec(p + 28);
3698 extra_length = archive_le16dec(p + 30);
3699 comment_length = archive_le16dec(p + 32);
3700 /* disk_start = archive_le16dec(p + 34);
3701 * Better be zero.
3702 * internal_attributes = archive_le16dec(p + 36);
3703 * text bit */
3704 external_attributes = archive_le32dec(p + 38);
3705 zip_entry->local_header_offset =
3706 archive_le32dec(p + 42) + correction;
3707
3708 /* If we can't guess the mode, leave it zero here;
3709 when we read the local file header we might get
3710 more information. */
3711 if (zip_entry->system == 3) {
3712 zip_entry->mode = external_attributes >> 16;
3713 } else if (zip_entry->system == 0) {
3714 // Interpret MSDOS directory bit
3715 if (0x10 == (external_attributes & 0x10)) {
3716 zip_entry->mode = AE_IFDIR | 0775;
3717 } else {
3718 zip_entry->mode = AE_IFREG | 0664;
3719 }
3720 if (0x01 == (external_attributes & 0x01)) {
3721 // Read-only bit; strip write permissions
3722 zip_entry->mode &= 0555;
3723 }
3724 } else {
3725 zip_entry->mode = 0;
3726 }
3727
3728 /* We're done with the regular data; get the filename and
3729 * extra data. */
3730 __archive_read_consume(a, 46);
3731 p = __archive_read_ahead(a, filename_length + extra_length,
3732 NULL);
3733 if (p == NULL) {
3734 archive_set_error(&a->archive,
3735 ARCHIVE_ERRNO_FILE_FORMAT,
3736 "Truncated ZIP file header");
3737 return ARCHIVE_FATAL;
3738 }
3739 if (ARCHIVE_OK != process_extra(a, entry, p + filename_length,
3740 extra_length, zip_entry)) {
3741 return ARCHIVE_FATAL;
3742 }
3743
3744 /*
3745 * Mac resource fork files are stored under the
3746 * "__MACOSX/" directory, so we should check if
3747 * it is.
3748 */
3749 if (!zip->process_mac_extensions) {
3750 /* Treat every entry as a regular entry. */
3751 __archive_rb_tree_insert_node(&zip->tree,
3752 &zip_entry->node);
3753 } else {
3754 name = p;
3755 r = rsrc_basename(name, filename_length);
3756 if (filename_length >= 9 &&
3757 strncmp("__MACOSX/", name, 9) == 0) {
3758 /* If this file is not a resource fork nor
3759 * a directory. We should treat it as a non
3760 * resource fork file to expose it. */
3761 if (name[filename_length-1] != '/' &&
3762 (r - name < 3 || r[0] != '.' ||
3763 r[1] != '_')) {
3764 __archive_rb_tree_insert_node(
3765 &zip->tree, &zip_entry->node);
3766 /* Expose its parent directories. */
3767 expose_parent_dirs(zip, name,
3768 filename_length);
3769 } else {
3770 /* This file is a resource fork file or
3771 * a directory. */
3772 archive_strncpy(&(zip_entry->rsrcname),
3773 name, filename_length);
3774 __archive_rb_tree_insert_node(
3775 &zip->tree_rsrc, &zip_entry->node);
3776 }
3777 } else {
3778 /* Generate resource fork name to find its
3779 * resource file at zip->tree_rsrc. */
3780 archive_strcpy(&(zip_entry->rsrcname),
3781 "__MACOSX/");
3782 archive_strncat(&(zip_entry->rsrcname),
3783 name, r - name);
3784 archive_strcat(&(zip_entry->rsrcname), "._");
3785 archive_strncat(&(zip_entry->rsrcname),
3786 name + (r - name),
3787 filename_length - (r - name));
3788 /* Register an entry to RB tree to sort it by
3789 * file offset. */
3790 __archive_rb_tree_insert_node(&zip->tree,
3791 &zip_entry->node);
3792 }
3793 }
3794
3795 /* Skip the comment too ... */
3796 __archive_read_consume(a,
3797 filename_length + extra_length + comment_length);
3798 }
3799
3800 return ARCHIVE_OK;
3801 }
3802
3803 static ssize_t
zip_get_local_file_header_size(struct archive_read * a,size_t extra)3804 zip_get_local_file_header_size(struct archive_read *a, size_t extra)
3805 {
3806 const char *p;
3807 ssize_t filename_length, extra_length;
3808
3809 if ((p = __archive_read_ahead(a, extra + 30, NULL)) == NULL) {
3810 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3811 "Truncated ZIP file header");
3812 return (ARCHIVE_WARN);
3813 }
3814 p += extra;
3815
3816 if (memcmp(p, "PK\003\004", 4) != 0) {
3817 archive_set_error(&a->archive, -1, "Damaged Zip archive");
3818 return ARCHIVE_WARN;
3819 }
3820 filename_length = archive_le16dec(p + 26);
3821 extra_length = archive_le16dec(p + 28);
3822
3823 return (30 + filename_length + extra_length);
3824 }
3825
3826 static int
zip_read_mac_metadata(struct archive_read * a,struct archive_entry * entry,struct zip_entry * rsrc)3827 zip_read_mac_metadata(struct archive_read *a, struct archive_entry *entry,
3828 struct zip_entry *rsrc)
3829 {
3830 struct zip *zip = (struct zip *)a->format->data;
3831 unsigned char *metadata, *mp;
3832 int64_t offset = archive_filter_bytes(&a->archive, 0);
3833 size_t remaining_bytes, metadata_bytes;
3834 ssize_t hsize;
3835 int ret = ARCHIVE_OK, eof;
3836
3837 switch(rsrc->compression) {
3838 case 0: /* No compression. */
3839 if (rsrc->uncompressed_size != rsrc->compressed_size) {
3840 archive_set_error(&a->archive,
3841 ARCHIVE_ERRNO_FILE_FORMAT,
3842 "Malformed OS X metadata entry: "
3843 "inconsistent size");
3844 return (ARCHIVE_FATAL);
3845 }
3846 #ifdef HAVE_ZLIB_H
3847 case 8: /* Deflate compression. */
3848 #endif
3849 break;
3850 default: /* Unsupported compression. */
3851 /* Return a warning. */
3852 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3853 "Unsupported ZIP compression method (%s)",
3854 compression_name(rsrc->compression));
3855 /* We can't decompress this entry, but we will
3856 * be able to skip() it and try the next entry. */
3857 return (ARCHIVE_WARN);
3858 }
3859
3860 if (rsrc->uncompressed_size > (4 * 1024 * 1024)) {
3861 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3862 "Mac metadata is too large: %jd > 4M bytes",
3863 (intmax_t)rsrc->uncompressed_size);
3864 return (ARCHIVE_WARN);
3865 }
3866 if (rsrc->compressed_size > (4 * 1024 * 1024)) {
3867 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
3868 "Mac metadata is too large: %jd > 4M bytes",
3869 (intmax_t)rsrc->compressed_size);
3870 return (ARCHIVE_WARN);
3871 }
3872
3873 metadata = malloc((size_t)rsrc->uncompressed_size);
3874 if (metadata == NULL) {
3875 archive_set_error(&a->archive, ENOMEM,
3876 "Can't allocate memory for Mac metadata");
3877 return (ARCHIVE_FATAL);
3878 }
3879
3880 if (offset < rsrc->local_header_offset)
3881 __archive_read_consume(a, rsrc->local_header_offset - offset);
3882 else if (offset != rsrc->local_header_offset) {
3883 __archive_read_seek(a, rsrc->local_header_offset, SEEK_SET);
3884 }
3885
3886 hsize = zip_get_local_file_header_size(a, 0);
3887 __archive_read_consume(a, hsize);
3888
3889 remaining_bytes = (size_t)rsrc->compressed_size;
3890 metadata_bytes = (size_t)rsrc->uncompressed_size;
3891 mp = metadata;
3892 eof = 0;
3893 while (!eof && remaining_bytes) {
3894 const unsigned char *p;
3895 ssize_t bytes_avail;
3896 size_t bytes_used;
3897
3898 p = __archive_read_ahead(a, 1, &bytes_avail);
3899 if (p == NULL) {
3900 archive_set_error(&a->archive,
3901 ARCHIVE_ERRNO_FILE_FORMAT,
3902 "Truncated ZIP file header");
3903 ret = ARCHIVE_WARN;
3904 goto exit_mac_metadata;
3905 }
3906 if ((size_t)bytes_avail > remaining_bytes)
3907 bytes_avail = remaining_bytes;
3908 switch(rsrc->compression) {
3909 case 0: /* No compression. */
3910 if ((size_t)bytes_avail > metadata_bytes)
3911 bytes_avail = metadata_bytes;
3912 memcpy(mp, p, bytes_avail);
3913 bytes_used = (size_t)bytes_avail;
3914 metadata_bytes -= bytes_used;
3915 mp += bytes_used;
3916 if (metadata_bytes == 0)
3917 eof = 1;
3918 break;
3919 #ifdef HAVE_ZLIB_H
3920 case 8: /* Deflate compression. */
3921 {
3922 int r;
3923
3924 ret = zip_deflate_init(a, zip);
3925 if (ret != ARCHIVE_OK)
3926 goto exit_mac_metadata;
3927 zip->stream.next_in =
3928 (Bytef *)(uintptr_t)(const void *)p;
3929 zip->stream.avail_in = (uInt)bytes_avail;
3930 zip->stream.total_in = 0;
3931 zip->stream.next_out = mp;
3932 zip->stream.avail_out = (uInt)metadata_bytes;
3933 zip->stream.total_out = 0;
3934
3935 r = inflate(&zip->stream, 0);
3936 switch (r) {
3937 case Z_OK:
3938 break;
3939 case Z_STREAM_END:
3940 eof = 1;
3941 break;
3942 case Z_MEM_ERROR:
3943 archive_set_error(&a->archive, ENOMEM,
3944 "Out of memory for ZIP decompression");
3945 ret = ARCHIVE_FATAL;
3946 goto exit_mac_metadata;
3947 default:
3948 archive_set_error(&a->archive,
3949 ARCHIVE_ERRNO_MISC,
3950 "ZIP decompression failed (%d)", r);
3951 ret = ARCHIVE_FATAL;
3952 goto exit_mac_metadata;
3953 }
3954 bytes_used = zip->stream.total_in;
3955 metadata_bytes -= zip->stream.total_out;
3956 mp += zip->stream.total_out;
3957 break;
3958 }
3959 #endif
3960 default:
3961 bytes_used = 0;
3962 break;
3963 }
3964 __archive_read_consume(a, bytes_used);
3965 remaining_bytes -= bytes_used;
3966 }
3967 archive_entry_copy_mac_metadata(entry, metadata,
3968 (size_t)rsrc->uncompressed_size - metadata_bytes);
3969
3970 exit_mac_metadata:
3971 __archive_read_seek(a, offset, SEEK_SET);
3972 zip->decompress_init = 0;
3973 free(metadata);
3974 return (ret);
3975 }
3976
3977 static int
archive_read_format_zip_seekable_read_header(struct archive_read * a,struct archive_entry * entry)3978 archive_read_format_zip_seekable_read_header(struct archive_read *a,
3979 struct archive_entry *entry)
3980 {
3981 struct zip *zip = (struct zip *)a->format->data;
3982 struct zip_entry *rsrc;
3983 int64_t offset;
3984 int r, ret = ARCHIVE_OK;
3985
3986 /*
3987 * It should be sufficient to call archive_read_next_header() for
3988 * a reader to determine if an entry is encrypted or not. If the
3989 * encryption of an entry is only detectable when calling
3990 * archive_read_data(), so be it. We'll do the same check there
3991 * as well.
3992 */
3993 if (zip->has_encrypted_entries ==
3994 ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW)
3995 zip->has_encrypted_entries = 0;
3996
3997 a->archive.archive_format = ARCHIVE_FORMAT_ZIP;
3998 if (a->archive.archive_format_name == NULL)
3999 a->archive.archive_format_name = "ZIP";
4000
4001 if (zip->zip_entries == NULL) {
4002 r = slurp_central_directory(a, entry, zip);
4003 if (r != ARCHIVE_OK)
4004 return r;
4005 /* Get first entry whose local header offset is lower than
4006 * other entries in the archive file. */
4007 zip->entry =
4008 (struct zip_entry *)ARCHIVE_RB_TREE_MIN(&zip->tree);
4009 } else if (zip->entry != NULL) {
4010 /* Get next entry in local header offset order. */
4011 zip->entry = (struct zip_entry *)__archive_rb_tree_iterate(
4012 &zip->tree, &zip->entry->node, ARCHIVE_RB_DIR_RIGHT);
4013 }
4014
4015 if (zip->entry == NULL)
4016 return ARCHIVE_EOF;
4017
4018 if (zip->entry->rsrcname.s)
4019 rsrc = (struct zip_entry *)__archive_rb_tree_find_node(
4020 &zip->tree_rsrc, zip->entry->rsrcname.s);
4021 else
4022 rsrc = NULL;
4023
4024 if (zip->cctx_valid)
4025 archive_decrypto_aes_ctr_release(&zip->cctx);
4026 if (zip->hctx_valid)
4027 archive_hmac_sha1_cleanup(&zip->hctx);
4028 zip->tctx_valid = zip->cctx_valid = zip->hctx_valid = 0;
4029 __archive_read_reset_passphrase(a);
4030
4031 /* File entries are sorted by the header offset, we should mostly
4032 * use __archive_read_consume to advance a read point to avoid
4033 * redundant data reading. */
4034 offset = archive_filter_bytes(&a->archive, 0);
4035 if (offset < zip->entry->local_header_offset)
4036 __archive_read_consume(a,
4037 zip->entry->local_header_offset - offset);
4038 else if (offset != zip->entry->local_header_offset) {
4039 __archive_read_seek(a, zip->entry->local_header_offset,
4040 SEEK_SET);
4041 }
4042 zip->unconsumed = 0;
4043 r = zip_read_local_file_header(a, entry, zip);
4044 if (r != ARCHIVE_OK)
4045 return r;
4046 if (rsrc) {
4047 int ret2 = zip_read_mac_metadata(a, entry, rsrc);
4048 if (ret2 < ret)
4049 ret = ret2;
4050 }
4051 return (ret);
4052 }
4053
4054 /*
4055 * We're going to seek for the next header anyway, so we don't
4056 * need to bother doing anything here.
4057 */
4058 static int
archive_read_format_zip_read_data_skip_seekable(struct archive_read * a)4059 archive_read_format_zip_read_data_skip_seekable(struct archive_read *a)
4060 {
4061 struct zip *zip;
4062 zip = (struct zip *)(a->format->data);
4063
4064 zip->unconsumed = 0;
4065 return (ARCHIVE_OK);
4066 }
4067
4068 int
archive_read_support_format_zip_seekable(struct archive * _a)4069 archive_read_support_format_zip_seekable(struct archive *_a)
4070 {
4071 struct archive_read *a = (struct archive_read *)_a;
4072 struct zip *zip;
4073 int r;
4074
4075 archive_check_magic(_a, ARCHIVE_READ_MAGIC,
4076 ARCHIVE_STATE_NEW, "archive_read_support_format_zip_seekable");
4077
4078 zip = (struct zip *)calloc(1, sizeof(*zip));
4079 if (zip == NULL) {
4080 archive_set_error(&a->archive, ENOMEM,
4081 "Can't allocate zip data");
4082 return (ARCHIVE_FATAL);
4083 }
4084
4085 #ifdef HAVE_COPYFILE_H
4086 /* Set this by default on Mac OS. */
4087 zip->process_mac_extensions = 1;
4088 #endif
4089
4090 /*
4091 * Until enough data has been read, we cannot tell about
4092 * any encrypted entries yet.
4093 */
4094 zip->has_encrypted_entries = ARCHIVE_READ_FORMAT_ENCRYPTION_DONT_KNOW;
4095 zip->crc32func = real_crc32;
4096
4097 r = __archive_read_register_format(a,
4098 zip,
4099 "zip",
4100 archive_read_format_zip_seekable_bid,
4101 archive_read_format_zip_options,
4102 archive_read_format_zip_seekable_read_header,
4103 archive_read_format_zip_read_data,
4104 archive_read_format_zip_read_data_skip_seekable,
4105 NULL,
4106 archive_read_format_zip_cleanup,
4107 archive_read_support_format_zip_capabilities_seekable,
4108 archive_read_format_zip_has_encrypted_entries);
4109
4110 if (r != ARCHIVE_OK)
4111 free(zip);
4112 return (ARCHIVE_OK);
4113 }
4114
4115 /*# vim:set noet:*/
4116