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("$FreeBSD$"); 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 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 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 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 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 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 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 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 * 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 * 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 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 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 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 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 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 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 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