1 /* $OpenBSD: a_string.c,v 1.11 2022/05/20 08:04:21 tb Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <limits.h>
60 #include <stdlib.h>
61 #include <string.h>
62
63 #include <openssl/asn1.h>
64 #include <openssl/err.h>
65
66 #include "asn1_locl.h"
67
68 ASN1_STRING *
ASN1_STRING_new(void)69 ASN1_STRING_new(void)
70 {
71 return ASN1_STRING_type_new(V_ASN1_OCTET_STRING);
72 }
73
74 ASN1_STRING *
ASN1_STRING_type_new(int type)75 ASN1_STRING_type_new(int type)
76 {
77 ASN1_STRING *astr;
78
79 if ((astr = calloc(1, sizeof(ASN1_STRING))) == NULL) {
80 ASN1error(ERR_R_MALLOC_FAILURE);
81 return NULL;
82 }
83 astr->type = type;
84
85 return astr;
86 }
87
88 static void
ASN1_STRING_clear(ASN1_STRING * astr)89 ASN1_STRING_clear(ASN1_STRING *astr)
90 {
91 if (!(astr->flags & ASN1_STRING_FLAG_NDEF))
92 freezero(astr->data, astr->length);
93
94 astr->flags &= ~ASN1_STRING_FLAG_NDEF;
95 astr->data = NULL;
96 astr->length = 0;
97 }
98
99 void
ASN1_STRING_free(ASN1_STRING * astr)100 ASN1_STRING_free(ASN1_STRING *astr)
101 {
102 if (astr == NULL)
103 return;
104
105 ASN1_STRING_clear(astr);
106
107 free(astr);
108 }
109
110 int
ASN1_STRING_cmp(const ASN1_STRING * a,const ASN1_STRING * b)111 ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
112 {
113 int cmp;
114
115 if (a == NULL || b == NULL)
116 return -1;
117 if ((cmp = (a->length - b->length)) != 0)
118 return cmp;
119 if ((cmp = memcmp(a->data, b->data, a->length)) != 0)
120 return cmp;
121
122 return (a->type - b->type);
123 }
124
125 int
ASN1_STRING_copy(ASN1_STRING * dst,const ASN1_STRING * src)126 ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *src)
127 {
128 if (src == NULL)
129 return 0;
130
131 if (!ASN1_STRING_set(dst, src->data, src->length))
132 return 0;
133
134 dst->type = src->type;
135 dst->flags = src->flags & ~ASN1_STRING_FLAG_NDEF;
136
137 return 1;
138 }
139
140 ASN1_STRING *
ASN1_STRING_dup(const ASN1_STRING * src)141 ASN1_STRING_dup(const ASN1_STRING *src)
142 {
143 ASN1_STRING *astr;
144
145 if (src == NULL)
146 return NULL;
147
148 if ((astr = ASN1_STRING_new()) == NULL)
149 return NULL;
150 if (!ASN1_STRING_copy(astr, src)) {
151 ASN1_STRING_free(astr);
152 return NULL;
153 }
154 return astr;
155 }
156
157 int
ASN1_STRING_set(ASN1_STRING * astr,const void * _data,int len)158 ASN1_STRING_set(ASN1_STRING *astr, const void *_data, int len)
159 {
160 const char *data = _data;
161
162 if (len == -1) {
163 size_t slen;
164
165 if (data == NULL)
166 return 0;
167
168 if ((slen = strlen(data)) > INT_MAX)
169 return 0;
170
171 len = (int)slen;
172 }
173
174 ASN1_STRING_clear(astr);
175
176 if (len < 0 || len >= INT_MAX)
177 return 0;
178
179 if ((astr->data = calloc(1, len + 1)) == NULL) {
180 ASN1error(ERR_R_MALLOC_FAILURE);
181 return (0);
182 }
183 astr->length = len;
184
185 if (data != NULL) {
186 memcpy(astr->data, data, len);
187 astr->data[len] = '\0';
188 }
189
190 return 1;
191 }
192
193 void
ASN1_STRING_set0(ASN1_STRING * astr,void * data,int len)194 ASN1_STRING_set0(ASN1_STRING *astr, void *data, int len)
195 {
196 ASN1_STRING_clear(astr);
197
198 astr->data = data;
199 astr->length = len;
200 }
201
202 void
asn1_add_error(const unsigned char * address,int offset)203 asn1_add_error(const unsigned char *address, int offset)
204 {
205 ERR_asprintf_error_data("offset=%d", offset);
206 }
207
208 int
ASN1_STRING_length(const ASN1_STRING * astr)209 ASN1_STRING_length(const ASN1_STRING *astr)
210 {
211 return astr->length;
212 }
213
214 void
ASN1_STRING_length_set(ASN1_STRING * astr,int len)215 ASN1_STRING_length_set(ASN1_STRING *astr, int len)
216 {
217 /* This is dangerous and unfixable. */
218 astr->length = len;
219 }
220
221 int
ASN1_STRING_type(const ASN1_STRING * astr)222 ASN1_STRING_type(const ASN1_STRING *astr)
223 {
224 return astr->type;
225 }
226
227 unsigned char *
ASN1_STRING_data(ASN1_STRING * astr)228 ASN1_STRING_data(ASN1_STRING *astr)
229 {
230 return astr->data;
231 }
232
233 const unsigned char *
ASN1_STRING_get0_data(const ASN1_STRING * astr)234 ASN1_STRING_get0_data(const ASN1_STRING *astr)
235 {
236 return astr->data;
237 }
238
239 int
ASN1_STRING_print(BIO * bp,const ASN1_STRING * astr)240 ASN1_STRING_print(BIO *bp, const ASN1_STRING *astr)
241 {
242 int i, n;
243 char buf[80];
244 const char *p;
245
246 if (astr == NULL)
247 return 0;
248
249 n = 0;
250 p = (const char *)astr->data;
251 for (i = 0; i < astr->length; i++) {
252 if ((p[i] > '~') || ((p[i] < ' ') &&
253 (p[i] != '\n') && (p[i] != '\r')))
254 buf[n] = '.';
255 else
256 buf[n] = p[i];
257 n++;
258 if (n >= 80) {
259 if (BIO_write(bp, buf, n) <= 0)
260 return 0;
261 n = 0;
262 }
263 }
264 if (n > 0) {
265 if (BIO_write(bp, buf, n) <= 0)
266 return 0;
267 }
268
269 return 1;
270 }
271
272 /*
273 * Utility function: convert any string type to UTF8, returns number of bytes
274 * in output string or a negative error code
275 */
276 int
ASN1_STRING_to_UTF8(unsigned char ** out,const ASN1_STRING * in)277 ASN1_STRING_to_UTF8(unsigned char **out, const ASN1_STRING *in)
278 {
279 ASN1_STRING *astr = NULL;
280 int mbflag;
281 int ret = -1;
282
283 /*
284 * XXX We can't fail on *out != NULL here since things like haproxy and
285 * grpc pass in a pointer to an uninitialized pointer on the stack.
286 */
287 if (out == NULL)
288 goto err;
289
290 if (in == NULL)
291 goto err;
292
293 if ((mbflag = asn1_tag2charwidth(in->type)) == -1)
294 goto err;
295
296 mbflag |= MBSTRING_FLAG;
297
298 if ((ret = ASN1_mbstring_copy(&astr, in->data, in->length, mbflag,
299 B_ASN1_UTF8STRING)) < 0)
300 goto err;
301
302 *out = astr->data;
303 ret = astr->length;
304
305 astr->data = NULL;
306 astr->length = 0;
307
308 err:
309 ASN1_STRING_free(astr);
310
311 return ret;
312 }
313
314 int
i2a_ASN1_STRING(BIO * bp,const ASN1_STRING * astr,int type)315 i2a_ASN1_STRING(BIO *bp, const ASN1_STRING *astr, int type)
316 {
317 int i, n = 0;
318 static const char h[] = "0123456789ABCDEF";
319 char buf[2];
320
321 if (astr == NULL)
322 return 0;
323
324 if (astr->length == 0) {
325 if (BIO_write(bp, "0", 1) != 1)
326 goto err;
327 n = 1;
328 } else {
329 for (i = 0; i < astr->length; i++) {
330 if ((i != 0) && (i % 35 == 0)) {
331 if (BIO_write(bp, "\\\n", 2) != 2)
332 goto err;
333 n += 2;
334 }
335 buf[0] = h[((unsigned char)astr->data[i] >> 4) & 0x0f];
336 buf[1] = h[((unsigned char)astr->data[i]) & 0x0f];
337 if (BIO_write(bp, buf, 2) != 2)
338 goto err;
339 n += 2;
340 }
341 }
342 return n;
343
344 err:
345 return -1;
346 }
347
348 int
a2i_ASN1_STRING(BIO * bp,ASN1_STRING * astr,char * buf,int size)349 a2i_ASN1_STRING(BIO *bp, ASN1_STRING *astr, char *buf, int size)
350 {
351 int ret = 0;
352 int i, j, k, m, n, again, bufsize;
353 unsigned char *s = NULL, *sp;
354 unsigned char *bufp;
355 int first = 1;
356 size_t num = 0, slen = 0;
357
358 bufsize = BIO_gets(bp, buf, size);
359 for (;;) {
360 if (bufsize < 1) {
361 if (first)
362 break;
363 else
364 goto err_sl;
365 }
366 first = 0;
367
368 i = bufsize;
369 if (buf[i-1] == '\n')
370 buf[--i] = '\0';
371 if (i == 0)
372 goto err_sl;
373 if (buf[i-1] == '\r')
374 buf[--i] = '\0';
375 if (i == 0)
376 goto err_sl;
377 if (buf[i - 1] == '\\') {
378 i--;
379 again = 1;
380 } else
381 again = 0;
382 buf[i] = '\0';
383 if (i < 2)
384 goto err_sl;
385
386 bufp = (unsigned char *)buf;
387
388 k = 0;
389 if (i % 2 != 0) {
390 ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);
391 goto err;
392 }
393 i /= 2;
394 if (num + i > slen) {
395 sp = realloc(s, num + i);
396 if (sp == NULL) {
397 ASN1error(ERR_R_MALLOC_FAILURE);
398 goto err;
399 }
400 s = sp;
401 slen = num + i;
402 }
403 for (j = 0; j < i; j++, k += 2) {
404 for (n = 0; n < 2; n++) {
405 m = bufp[k + n];
406 if ((m >= '0') && (m <= '9'))
407 m -= '0';
408 else if ((m >= 'a') && (m <= 'f'))
409 m = m - 'a' + 10;
410 else if ((m >= 'A') && (m <= 'F'))
411 m = m - 'A' + 10;
412 else {
413 ASN1error(ASN1_R_NON_HEX_CHARACTERS);
414 goto err;
415 }
416 s[num + j] <<= 4;
417 s[num + j] |= m;
418 }
419 }
420 num += i;
421 if (again)
422 bufsize = BIO_gets(bp, buf, size);
423 else
424 break;
425 }
426 astr->length = num;
427 astr->data = s;
428
429 return 1;
430
431 err_sl:
432 ASN1error(ASN1_R_SHORT_LINE);
433 err:
434 free(s);
435
436 return ret;
437 }
438