1 /*
2 * Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include <string.h>
12 #include "internal/cryptlib.h"
13 #include "crypto/asn1.h"
14 #include <openssl/crypto.h>
15 #include <openssl/x509.h>
16 #include <openssl/asn1.h>
17
18 #include "charmap.h"
19
20 /*
21 * ASN1_STRING_print_ex() and X509_NAME_print_ex(). Enhanced string and name
22 * printing routines handling multibyte characters, RFC2253 and a host of
23 * other options.
24 */
25
26 #define CHARTYPE_BS_ESC (ASN1_STRFLGS_ESC_2253 | CHARTYPE_FIRST_ESC_2253 | CHARTYPE_LAST_ESC_2253)
27
28 #define ESC_FLAGS (ASN1_STRFLGS_ESC_2253 | \
29 ASN1_STRFLGS_ESC_2254 | \
30 ASN1_STRFLGS_ESC_QUOTE | \
31 ASN1_STRFLGS_ESC_CTRL | \
32 ASN1_STRFLGS_ESC_MSB)
33
34 /*
35 * Three IO functions for sending data to memory, a BIO and a FILE
36 * pointer.
37 */
send_bio_chars(void * arg,const void * buf,int len)38 static int send_bio_chars(void *arg, const void *buf, int len)
39 {
40 if (!arg)
41 return 1;
42 if (BIO_write(arg, buf, len) != len)
43 return 0;
44 return 1;
45 }
46
47 #ifndef OPENSSL_NO_STDIO
send_fp_chars(void * arg,const void * buf,int len)48 static int send_fp_chars(void *arg, const void *buf, int len)
49 {
50 if (!arg)
51 return 1;
52 if (fwrite(buf, 1, len, arg) != (unsigned int)len)
53 return 0;
54 return 1;
55 }
56 #endif
57
58 typedef int char_io (void *arg, const void *buf, int len);
59
60 /*
61 * This function handles display of strings, one character at a time. It is
62 * passed an unsigned long for each character because it could come from 2 or
63 * even 4 byte forms.
64 */
65
do_esc_char(unsigned long c,unsigned short flags,char * do_quotes,char_io * io_ch,void * arg)66 static int do_esc_char(unsigned long c, unsigned short flags, char *do_quotes,
67 char_io *io_ch, void *arg)
68 {
69 unsigned short chflgs;
70 unsigned char chtmp;
71 char tmphex[HEX_SIZE(long) + 3];
72
73 if (c > 0xffffffffL)
74 return -1;
75 if (c > 0xffff) {
76 BIO_snprintf(tmphex, sizeof(tmphex), "\\W%08lX", c);
77 if (!io_ch(arg, tmphex, 10))
78 return -1;
79 return 10;
80 }
81 if (c > 0xff) {
82 BIO_snprintf(tmphex, sizeof(tmphex), "\\U%04lX", c);
83 if (!io_ch(arg, tmphex, 6))
84 return -1;
85 return 6;
86 }
87 chtmp = (unsigned char)c;
88 if (chtmp > 0x7f)
89 chflgs = flags & ASN1_STRFLGS_ESC_MSB;
90 else
91 chflgs = char_type[chtmp] & flags;
92 if (chflgs & CHARTYPE_BS_ESC) {
93 /* If we don't escape with quotes, signal we need quotes */
94 if (chflgs & ASN1_STRFLGS_ESC_QUOTE) {
95 if (do_quotes)
96 *do_quotes = 1;
97 if (!io_ch(arg, &chtmp, 1))
98 return -1;
99 return 1;
100 }
101 if (!io_ch(arg, "\\", 1))
102 return -1;
103 if (!io_ch(arg, &chtmp, 1))
104 return -1;
105 return 2;
106 }
107 if (chflgs & (ASN1_STRFLGS_ESC_CTRL
108 | ASN1_STRFLGS_ESC_MSB
109 | ASN1_STRFLGS_ESC_2254)) {
110 BIO_snprintf(tmphex, 11, "\\%02X", chtmp);
111 if (!io_ch(arg, tmphex, 3))
112 return -1;
113 return 3;
114 }
115 /*
116 * If we get this far and do any escaping at all must escape the escape
117 * character itself: backslash.
118 */
119 if (chtmp == '\\' && (flags & ESC_FLAGS)) {
120 if (!io_ch(arg, "\\\\", 2))
121 return -1;
122 return 2;
123 }
124 if (!io_ch(arg, &chtmp, 1))
125 return -1;
126 return 1;
127 }
128
129 #define BUF_TYPE_WIDTH_MASK 0x7
130 #define BUF_TYPE_CONVUTF8 0x8
131
132 /*
133 * This function sends each character in a buffer to do_esc_char(). It
134 * interprets the content formats and converts to or from UTF8 as
135 * appropriate.
136 */
137
do_buf(unsigned char * buf,int buflen,int type,unsigned short flags,char * quotes,char_io * io_ch,void * arg)138 static int do_buf(unsigned char *buf, int buflen,
139 int type, unsigned short flags, char *quotes, char_io *io_ch,
140 void *arg)
141 {
142 int i, outlen, len, charwidth;
143 unsigned short orflags;
144 unsigned char *p, *q;
145 unsigned long c;
146
147 p = buf;
148 q = buf + buflen;
149 outlen = 0;
150 charwidth = type & BUF_TYPE_WIDTH_MASK;
151
152 switch (charwidth) {
153 case 4:
154 if (buflen & 3) {
155 ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_UNIVERSALSTRING_LENGTH);
156 return -1;
157 }
158 break;
159 case 2:
160 if (buflen & 1) {
161 ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_BMPSTRING_LENGTH);
162 return -1;
163 }
164 break;
165 default:
166 break;
167 }
168
169 while (p != q) {
170 if (p == buf && flags & ASN1_STRFLGS_ESC_2253)
171 orflags = CHARTYPE_FIRST_ESC_2253;
172 else
173 orflags = 0;
174
175 switch (charwidth) {
176 case 4:
177 c = ((unsigned long)*p++) << 24;
178 c |= ((unsigned long)*p++) << 16;
179 c |= ((unsigned long)*p++) << 8;
180 c |= *p++;
181 break;
182
183 case 2:
184 c = ((unsigned long)*p++) << 8;
185 c |= *p++;
186 break;
187
188 case 1:
189 c = *p++;
190 break;
191
192 case 0:
193 i = UTF8_getc(p, buflen, &c);
194 if (i < 0)
195 return -1; /* Invalid UTF8String */
196 buflen -= i;
197 p += i;
198 break;
199 default:
200 return -1; /* invalid width */
201 }
202 if (p == q && flags & ASN1_STRFLGS_ESC_2253)
203 orflags = CHARTYPE_LAST_ESC_2253;
204 if (type & BUF_TYPE_CONVUTF8) {
205 unsigned char utfbuf[6];
206 int utflen;
207 utflen = UTF8_putc(utfbuf, sizeof(utfbuf), c);
208 for (i = 0; i < utflen; i++) {
209 /*
210 * We don't need to worry about setting orflags correctly
211 * because if utflen==1 its value will be correct anyway
212 * otherwise each character will be > 0x7f and so the
213 * character will never be escaped on first and last.
214 */
215 len = do_esc_char(utfbuf[i], flags | orflags, quotes,
216 io_ch, arg);
217 if (len < 0)
218 return -1;
219 outlen += len;
220 }
221 } else {
222 len = do_esc_char(c, flags | orflags, quotes,
223 io_ch, arg);
224 if (len < 0)
225 return -1;
226 outlen += len;
227 }
228 }
229 return outlen;
230 }
231
232 /* This function hex dumps a buffer of characters */
233
do_hex_dump(char_io * io_ch,void * arg,unsigned char * buf,int buflen)234 static int do_hex_dump(char_io *io_ch, void *arg, unsigned char *buf,
235 int buflen)
236 {
237 static const char hexdig[] = "0123456789ABCDEF";
238 unsigned char *p, *q;
239 char hextmp[2];
240 if (arg) {
241 p = buf;
242 q = buf + buflen;
243 while (p != q) {
244 hextmp[0] = hexdig[*p >> 4];
245 hextmp[1] = hexdig[*p & 0xf];
246 if (!io_ch(arg, hextmp, 2))
247 return -1;
248 p++;
249 }
250 }
251 return buflen << 1;
252 }
253
254 /*
255 * "dump" a string. This is done when the type is unknown, or the flags
256 * request it. We can either dump the content octets or the entire DER
257 * encoding. This uses the RFC2253 #01234 format.
258 */
259
do_dump(unsigned long lflags,char_io * io_ch,void * arg,const ASN1_STRING * str)260 static int do_dump(unsigned long lflags, char_io *io_ch, void *arg,
261 const ASN1_STRING *str)
262 {
263 /*
264 * Placing the ASN1_STRING in a temp ASN1_TYPE allows the DER encoding to
265 * readily obtained
266 */
267 ASN1_TYPE t;
268 unsigned char *der_buf, *p;
269 int outlen, der_len;
270
271 if (!io_ch(arg, "#", 1))
272 return -1;
273 /* If we don't dump DER encoding just dump content octets */
274 if (!(lflags & ASN1_STRFLGS_DUMP_DER)) {
275 outlen = do_hex_dump(io_ch, arg, str->data, str->length);
276 if (outlen < 0)
277 return -1;
278 return outlen + 1;
279 }
280 t.type = str->type;
281 t.value.ptr = (char *)str;
282 der_len = i2d_ASN1_TYPE(&t, NULL);
283 if (der_len <= 0)
284 return -1;
285 if ((der_buf = OPENSSL_malloc(der_len)) == NULL) {
286 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
287 return -1;
288 }
289 p = der_buf;
290 i2d_ASN1_TYPE(&t, &p);
291 outlen = do_hex_dump(io_ch, arg, der_buf, der_len);
292 OPENSSL_free(der_buf);
293 if (outlen < 0)
294 return -1;
295 return outlen + 1;
296 }
297
298 /*
299 * Lookup table to convert tags to character widths, 0 = UTF8 encoded, -1 is
300 * used for non string types otherwise it is the number of bytes per
301 * character
302 */
303
304 static const signed char tag2nbyte[] = {
305 -1, -1, -1, -1, -1, /* 0-4 */
306 -1, -1, -1, -1, -1, /* 5-9 */
307 -1, -1, /* 10-11 */
308 0, /* 12 V_ASN1_UTF8STRING */
309 -1, -1, -1, -1, -1, /* 13-17 */
310 1, /* 18 V_ASN1_NUMERICSTRING */
311 1, /* 19 V_ASN1_PRINTABLESTRING */
312 1, /* 20 V_ASN1_T61STRING */
313 -1, /* 21 */
314 1, /* 22 V_ASN1_IA5STRING */
315 1, /* 23 V_ASN1_UTCTIME */
316 1, /* 24 V_ASN1_GENERALIZEDTIME */
317 -1, /* 25 */
318 1, /* 26 V_ASN1_ISO64STRING */
319 -1, /* 27 */
320 4, /* 28 V_ASN1_UNIVERSALSTRING */
321 -1, /* 29 */
322 2 /* 30 V_ASN1_BMPSTRING */
323 };
324
325 /*
326 * This is the main function, print out an ASN1_STRING taking note of various
327 * escape and display options. Returns number of characters written or -1 if
328 * an error occurred.
329 */
330
do_print_ex(char_io * io_ch,void * arg,unsigned long lflags,const ASN1_STRING * str)331 static int do_print_ex(char_io *io_ch, void *arg, unsigned long lflags,
332 const ASN1_STRING *str)
333 {
334 int outlen, len;
335 int type;
336 char quotes;
337 unsigned short flags;
338 quotes = 0;
339 /* Keep a copy of escape flags */
340 flags = (unsigned short)(lflags & ESC_FLAGS);
341
342 type = str->type;
343
344 outlen = 0;
345
346 if (lflags & ASN1_STRFLGS_SHOW_TYPE) {
347 const char *tagname;
348 tagname = ASN1_tag2str(type);
349 outlen += strlen(tagname);
350 if (!io_ch(arg, tagname, outlen) || !io_ch(arg, ":", 1))
351 return -1;
352 outlen++;
353 }
354
355 /* Decide what to do with type, either dump content or display it */
356
357 /* Dump everything */
358 if (lflags & ASN1_STRFLGS_DUMP_ALL)
359 type = -1;
360 /* Ignore the string type */
361 else if (lflags & ASN1_STRFLGS_IGNORE_TYPE)
362 type = 1;
363 else {
364 /* Else determine width based on type */
365 if ((type > 0) && (type < 31))
366 type = tag2nbyte[type];
367 else
368 type = -1;
369 if ((type == -1) && !(lflags & ASN1_STRFLGS_DUMP_UNKNOWN))
370 type = 1;
371 }
372
373 if (type == -1) {
374 len = do_dump(lflags, io_ch, arg, str);
375 if (len < 0)
376 return -1;
377 outlen += len;
378 return outlen;
379 }
380
381 if (lflags & ASN1_STRFLGS_UTF8_CONVERT) {
382 /*
383 * Note: if string is UTF8 and we want to convert to UTF8 then we
384 * just interpret it as 1 byte per character to avoid converting
385 * twice.
386 */
387 if (!type)
388 type = 1;
389 else
390 type |= BUF_TYPE_CONVUTF8;
391 }
392
393 len = do_buf(str->data, str->length, type, flags, "es, io_ch, NULL);
394 if (len < 0)
395 return -1;
396 outlen += len;
397 if (quotes)
398 outlen += 2;
399 if (!arg)
400 return outlen;
401 if (quotes && !io_ch(arg, "\"", 1))
402 return -1;
403 if (do_buf(str->data, str->length, type, flags, NULL, io_ch, arg) < 0)
404 return -1;
405 if (quotes && !io_ch(arg, "\"", 1))
406 return -1;
407 return outlen;
408 }
409
410 /* Used for line indenting: print 'indent' spaces */
411
do_indent(char_io * io_ch,void * arg,int indent)412 static int do_indent(char_io *io_ch, void *arg, int indent)
413 {
414 int i;
415 for (i = 0; i < indent; i++)
416 if (!io_ch(arg, " ", 1))
417 return 0;
418 return 1;
419 }
420
421 #define FN_WIDTH_LN 25
422 #define FN_WIDTH_SN 10
423
do_name_ex(char_io * io_ch,void * arg,const X509_NAME * n,int indent,unsigned long flags)424 static int do_name_ex(char_io *io_ch, void *arg, const X509_NAME *n,
425 int indent, unsigned long flags)
426 {
427 int i, prev = -1, orflags, cnt;
428 int fn_opt, fn_nid;
429 ASN1_OBJECT *fn;
430 const ASN1_STRING *val;
431 const X509_NAME_ENTRY *ent;
432 char objtmp[80];
433 const char *objbuf;
434 int outlen, len;
435 char *sep_dn, *sep_mv, *sep_eq;
436 int sep_dn_len, sep_mv_len, sep_eq_len;
437 if (indent < 0)
438 indent = 0;
439 outlen = indent;
440 if (!do_indent(io_ch, arg, indent))
441 return -1;
442 switch (flags & XN_FLAG_SEP_MASK) {
443 case XN_FLAG_SEP_MULTILINE:
444 sep_dn = "\n";
445 sep_dn_len = 1;
446 sep_mv = " + ";
447 sep_mv_len = 3;
448 break;
449
450 case XN_FLAG_SEP_COMMA_PLUS:
451 sep_dn = ",";
452 sep_dn_len = 1;
453 sep_mv = "+";
454 sep_mv_len = 1;
455 indent = 0;
456 break;
457
458 case XN_FLAG_SEP_CPLUS_SPC:
459 sep_dn = ", ";
460 sep_dn_len = 2;
461 sep_mv = " + ";
462 sep_mv_len = 3;
463 indent = 0;
464 break;
465
466 case XN_FLAG_SEP_SPLUS_SPC:
467 sep_dn = "; ";
468 sep_dn_len = 2;
469 sep_mv = " + ";
470 sep_mv_len = 3;
471 indent = 0;
472 break;
473
474 default:
475 return -1;
476 }
477
478 if (flags & XN_FLAG_SPC_EQ) {
479 sep_eq = " = ";
480 sep_eq_len = 3;
481 } else {
482 sep_eq = "=";
483 sep_eq_len = 1;
484 }
485
486 fn_opt = flags & XN_FLAG_FN_MASK;
487
488 cnt = X509_NAME_entry_count(n);
489 for (i = 0; i < cnt; i++) {
490 if (flags & XN_FLAG_DN_REV)
491 ent = X509_NAME_get_entry(n, cnt - i - 1);
492 else
493 ent = X509_NAME_get_entry(n, i);
494 if (prev != -1) {
495 if (prev == X509_NAME_ENTRY_set(ent)) {
496 if (!io_ch(arg, sep_mv, sep_mv_len))
497 return -1;
498 outlen += sep_mv_len;
499 } else {
500 if (!io_ch(arg, sep_dn, sep_dn_len))
501 return -1;
502 outlen += sep_dn_len;
503 if (!do_indent(io_ch, arg, indent))
504 return -1;
505 outlen += indent;
506 }
507 }
508 prev = X509_NAME_ENTRY_set(ent);
509 fn = X509_NAME_ENTRY_get_object(ent);
510 val = X509_NAME_ENTRY_get_data(ent);
511 fn_nid = OBJ_obj2nid(fn);
512 if (fn_opt != XN_FLAG_FN_NONE) {
513 int objlen, fld_len;
514 if ((fn_opt == XN_FLAG_FN_OID) || (fn_nid == NID_undef)) {
515 OBJ_obj2txt(objtmp, sizeof(objtmp), fn, 1);
516 fld_len = 0; /* XXX: what should this be? */
517 objbuf = objtmp;
518 } else {
519 if (fn_opt == XN_FLAG_FN_SN) {
520 fld_len = FN_WIDTH_SN;
521 objbuf = OBJ_nid2sn(fn_nid);
522 } else if (fn_opt == XN_FLAG_FN_LN) {
523 fld_len = FN_WIDTH_LN;
524 objbuf = OBJ_nid2ln(fn_nid);
525 } else {
526 fld_len = 0; /* XXX: what should this be? */
527 objbuf = "";
528 }
529 }
530 objlen = strlen(objbuf);
531 if (!io_ch(arg, objbuf, objlen))
532 return -1;
533 if ((objlen < fld_len) && (flags & XN_FLAG_FN_ALIGN)) {
534 if (!do_indent(io_ch, arg, fld_len - objlen))
535 return -1;
536 outlen += fld_len - objlen;
537 }
538 if (!io_ch(arg, sep_eq, sep_eq_len))
539 return -1;
540 outlen += objlen + sep_eq_len;
541 }
542 /*
543 * If the field name is unknown then fix up the DER dump flag. We
544 * might want to limit this further so it will DER dump on anything
545 * other than a few 'standard' fields.
546 */
547 if ((fn_nid == NID_undef) && (flags & XN_FLAG_DUMP_UNKNOWN_FIELDS))
548 orflags = ASN1_STRFLGS_DUMP_ALL;
549 else
550 orflags = 0;
551
552 len = do_print_ex(io_ch, arg, flags | orflags, val);
553 if (len < 0)
554 return -1;
555 outlen += len;
556 }
557 return outlen;
558 }
559
560 /* Wrappers round the main functions */
561
X509_NAME_print_ex(BIO * out,const X509_NAME * nm,int indent,unsigned long flags)562 int X509_NAME_print_ex(BIO *out, const X509_NAME *nm, int indent,
563 unsigned long flags)
564 {
565 if (flags == XN_FLAG_COMPAT)
566 return X509_NAME_print(out, nm, indent);
567 return do_name_ex(send_bio_chars, out, nm, indent, flags);
568 }
569
570 #ifndef OPENSSL_NO_STDIO
X509_NAME_print_ex_fp(FILE * fp,const X509_NAME * nm,int indent,unsigned long flags)571 int X509_NAME_print_ex_fp(FILE *fp, const X509_NAME *nm, int indent,
572 unsigned long flags)
573 {
574 if (flags == XN_FLAG_COMPAT) {
575 BIO *btmp;
576 int ret;
577 btmp = BIO_new_fp(fp, BIO_NOCLOSE);
578 if (!btmp)
579 return -1;
580 ret = X509_NAME_print(btmp, nm, indent);
581 BIO_free(btmp);
582 return ret;
583 }
584 return do_name_ex(send_fp_chars, fp, nm, indent, flags);
585 }
586 #endif
587
ASN1_STRING_print_ex(BIO * out,const ASN1_STRING * str,unsigned long flags)588 int ASN1_STRING_print_ex(BIO *out, const ASN1_STRING *str, unsigned long flags)
589 {
590 return do_print_ex(send_bio_chars, out, flags, str);
591 }
592
593 #ifndef OPENSSL_NO_STDIO
ASN1_STRING_print_ex_fp(FILE * fp,const ASN1_STRING * str,unsigned long flags)594 int ASN1_STRING_print_ex_fp(FILE *fp, const ASN1_STRING *str, unsigned long flags)
595 {
596 return do_print_ex(send_fp_chars, fp, flags, str);
597 }
598 #endif
599
600 /*
601 * Utility function: convert any string type to UTF8, returns number of bytes
602 * in output string or a negative error code
603 */
604
ASN1_STRING_to_UTF8(unsigned char ** out,const ASN1_STRING * in)605 int ASN1_STRING_to_UTF8(unsigned char **out, const ASN1_STRING *in)
606 {
607 ASN1_STRING stmp, *str = &stmp;
608 int mbflag, type, ret;
609 if (!in)
610 return -1;
611 type = in->type;
612 if ((type < 0) || (type > 30))
613 return -1;
614 mbflag = tag2nbyte[type];
615 if (mbflag == -1)
616 return -1;
617 mbflag |= MBSTRING_FLAG;
618 stmp.data = NULL;
619 stmp.length = 0;
620 stmp.flags = 0;
621 ret =
622 ASN1_mbstring_copy(&str, in->data, in->length, mbflag,
623 B_ASN1_UTF8STRING);
624 if (ret < 0)
625 return ret;
626 *out = stmp.data;
627 return stmp.length;
628 }
629