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Commit | Line | Data |
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0f113f3e | 1 | /* |
b6461792 | 2 | * Copyright 2000-2024 The OpenSSL Project Authors. All Rights Reserved. |
9d6b1ce6 | 3 | * |
365a2d99 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
2039c421 RS |
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 | |
9d6b1ce6 DSH |
8 | */ |
9 | ||
9d6b1ce6 | 10 | #include <stddef.h> |
a9daa467 | 11 | #include <string.h> |
9d6b1ce6 DSH |
12 | #include <openssl/asn1.h> |
13 | #include <openssl/asn1t.h> | |
14 | #include <openssl/objects.h> | |
15 | #include <openssl/buffer.h> | |
16 | #include <openssl/err.h> | |
bd95d64a | 17 | #include "internal/numbers.h" |
706457b7 | 18 | #include "asn1_local.h" |
9d6b1ce6 | 19 | |
4cabbb9f MC |
20 | /* |
21 | * Constructed types with a recursive definition (such as can be found in PKCS7) | |
22 | * could eventually exceed the stack given malicious input with excessive | |
23 | * recursion. Therefore we limit the stack depth. This is the maximum number of | |
24 | * recursive invocations of asn1_item_embed_d2i(). | |
25 | */ | |
26 | #define ASN1_MAX_CONSTRUCTED_NEST 30 | |
27 | ||
f93ad22f DSH |
28 | static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in, |
29 | long len, const ASN1_ITEM *it, | |
4cabbb9f | 30 | int tag, int aclass, char opt, ASN1_TLC *ctx, |
dea2878f MC |
31 | int depth, OSSL_LIB_CTX *libctx, |
32 | const char *propq); | |
f93ad22f | 33 | |
875a644a | 34 | static int asn1_check_eoc(const unsigned char **in, long len); |
e1cc0671 | 35 | static int asn1_find_end(const unsigned char **in, long len, char inf); |
8845420f DSH |
36 | |
37 | static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, | |
0f113f3e | 38 | char inf, int tag, int aclass, int depth); |
8845420f | 39 | |
875a644a | 40 | static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen); |
8845420f DSH |
41 | |
42 | static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, | |
0f113f3e MC |
43 | char *inf, char *cst, |
44 | const unsigned char **in, long len, | |
45 | int exptag, int expclass, char opt, ASN1_TLC *ctx); | |
8845420f DSH |
46 | |
47 | static int asn1_template_ex_d2i(ASN1_VALUE **pval, | |
0f113f3e MC |
48 | const unsigned char **in, long len, |
49 | const ASN1_TEMPLATE *tt, char opt, | |
dea2878f MC |
50 | ASN1_TLC *ctx, int depth, OSSL_LIB_CTX *libctx, |
51 | const char *propq); | |
8845420f | 52 | static int asn1_template_noexp_d2i(ASN1_VALUE **val, |
0f113f3e MC |
53 | const unsigned char **in, long len, |
54 | const ASN1_TEMPLATE *tt, char opt, | |
dea2878f MC |
55 | ASN1_TLC *ctx, int depth, |
56 | OSSL_LIB_CTX *libctx, const char *propq); | |
8845420f | 57 | static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, |
0f113f3e MC |
58 | const unsigned char **in, long len, |
59 | const ASN1_ITEM *it, | |
60 | int tag, int aclass, char opt, | |
61 | ASN1_TLC *ctx); | |
23dc1706 DSH |
62 | static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, |
63 | int utype, char *free_cont, const ASN1_ITEM *it); | |
9d6b1ce6 | 64 | |
1241126a | 65 | /* Table to convert tags to bit values, used for MSTRING type */ |
2d3e956a | 66 | static const unsigned long tag2bit[32] = { |
b853717f | 67 | /* tags 0 - 3 */ |
0f113f3e | 68 | 0, 0, 0, B_ASN1_BIT_STRING, |
b853717f | 69 | /* tags 4- 7 */ |
0f113f3e | 70 | B_ASN1_OCTET_STRING, 0, 0, B_ASN1_UNKNOWN, |
b853717f | 71 | /* tags 8-11 */ |
ccf19c23 | 72 | B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, 0, B_ASN1_UNKNOWN, |
b853717f | 73 | /* tags 12-15 */ |
0f113f3e | 74 | B_ASN1_UTF8STRING, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, |
b853717f | 75 | /* tags 16-19 */ |
0f113f3e | 76 | B_ASN1_SEQUENCE, 0, B_ASN1_NUMERICSTRING, B_ASN1_PRINTABLESTRING, |
b853717f | 77 | /* tags 20-22 */ |
0f113f3e | 78 | B_ASN1_T61STRING, B_ASN1_VIDEOTEXSTRING, B_ASN1_IA5STRING, |
b853717f | 79 | /* tags 23-24 */ |
0f113f3e | 80 | B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME, |
b853717f | 81 | /* tags 25-27 */ |
0f113f3e | 82 | B_ASN1_GRAPHICSTRING, B_ASN1_ISO64STRING, B_ASN1_GENERALSTRING, |
b853717f | 83 | /* tags 28-31 */ |
0f113f3e MC |
84 | B_ASN1_UNIVERSALSTRING, B_ASN1_UNKNOWN, B_ASN1_BMPSTRING, B_ASN1_UNKNOWN, |
85 | }; | |
1241126a DSH |
86 | |
87 | unsigned long ASN1_tag2bit(int tag) | |
0f113f3e MC |
88 | { |
89 | if ((tag < 0) || (tag > 30)) | |
90 | return 0; | |
91 | return tag2bit[tag]; | |
92 | } | |
1241126a | 93 | |
9d6b1ce6 DSH |
94 | /* Macro to initialize and invalidate the cache */ |
95 | ||
32b1da71 | 96 | #define asn1_tlc_clear(c) do { if ((c) != NULL) (c)->valid = 0; } while (0) |
de121164 | 97 | /* Version to avoid compiler warning about 'c' always non-NULL */ |
32b1da71 | 98 | #define asn1_tlc_clear_nc(c) do {(c)->valid = 0; } while (0) |
0f113f3e MC |
99 | |
100 | /* | |
101 | * Decode an ASN1 item, this currently behaves just like a standard 'd2i' | |
102 | * function. 'in' points to a buffer to read the data from, in future we | |
103 | * will have more advanced versions that can input data a piece at a time and | |
104 | * this will simply be a special case. | |
9d6b1ce6 DSH |
105 | */ |
106 | ||
dea2878f MC |
107 | static int asn1_item_ex_d2i_intern(ASN1_VALUE **pval, const unsigned char **in, |
108 | long len, const ASN1_ITEM *it, int tag, | |
109 | int aclass, char opt, ASN1_TLC *ctx, | |
110 | OSSL_LIB_CTX *libctx, const char *propq) | |
111 | { | |
112 | int rv; | |
113 | ||
114 | if (pval == NULL || it == NULL) { | |
115 | ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER); | |
116 | return 0; | |
117 | } | |
118 | rv = asn1_item_embed_d2i(pval, in, len, it, tag, aclass, opt, ctx, 0, | |
119 | libctx, propq); | |
120 | if (rv <= 0) | |
121 | ASN1_item_ex_free(pval, it); | |
122 | return rv; | |
123 | } | |
124 | ||
125 | int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len, | |
126 | const ASN1_ITEM *it, | |
127 | int tag, int aclass, char opt, ASN1_TLC *ctx) | |
128 | { | |
129 | return asn1_item_ex_d2i_intern(pval, in, len, it, tag, aclass, opt, ctx, | |
130 | NULL, NULL); | |
131 | } | |
132 | ||
133 | ASN1_VALUE *ASN1_item_d2i_ex(ASN1_VALUE **pval, | |
134 | const unsigned char **in, long len, | |
135 | const ASN1_ITEM *it, OSSL_LIB_CTX *libctx, | |
136 | const char *propq) | |
0f113f3e MC |
137 | { |
138 | ASN1_TLC c; | |
139 | ASN1_VALUE *ptmpval = NULL; | |
12a765a5 RS |
140 | |
141 | if (pval == NULL) | |
0f113f3e MC |
142 | pval = &ptmpval; |
143 | asn1_tlc_clear_nc(&c); | |
dea2878f MC |
144 | if (asn1_item_ex_d2i_intern(pval, in, len, it, -1, 0, 0, &c, libctx, |
145 | propq) > 0) | |
0f113f3e MC |
146 | return *pval; |
147 | return NULL; | |
148 | } | |
9d6b1ce6 | 149 | |
dea2878f MC |
150 | ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval, |
151 | const unsigned char **in, long len, | |
152 | const ASN1_ITEM *it) | |
f93ad22f | 153 | { |
dea2878f | 154 | return ASN1_item_d2i_ex(pval, in, len, it, NULL, NULL); |
f93ad22f DSH |
155 | } |
156 | ||
0f113f3e MC |
157 | /* |
158 | * Decode an item, taking care of IMPLICIT tagging, if any. If 'opt' set and | |
159 | * tag mismatch return -1 to handle OPTIONAL | |
9d6b1ce6 DSH |
160 | */ |
161 | ||
f93ad22f DSH |
162 | static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in, |
163 | long len, const ASN1_ITEM *it, | |
4cabbb9f | 164 | int tag, int aclass, char opt, ASN1_TLC *ctx, |
dea2878f MC |
165 | int depth, OSSL_LIB_CTX *libctx, |
166 | const char *propq) | |
0f113f3e MC |
167 | { |
168 | const ASN1_TEMPLATE *tt, *errtt = NULL; | |
0f113f3e | 169 | const ASN1_EXTERN_FUNCS *ef; |
db76a35e | 170 | const ASN1_AUX *aux; |
0f113f3e MC |
171 | ASN1_aux_cb *asn1_cb; |
172 | const unsigned char *p = NULL, *q; | |
dd12df79 | 173 | unsigned char oclass; |
0f113f3e MC |
174 | char seq_eoc, seq_nolen, cst, isopt; |
175 | long tmplen; | |
176 | int i; | |
177 | int otag; | |
178 | int ret = 0; | |
dd12df79 | 179 | ASN1_VALUE **pchptr; |
12a765a5 | 180 | |
db76a35e DDO |
181 | if (pval == NULL || it == NULL) { |
182 | ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER); | |
0f113f3e | 183 | return 0; |
db76a35e | 184 | } |
3e73111d DDO |
185 | if (len <= 0) { |
186 | ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL); | |
187 | return 0; | |
188 | } | |
db76a35e | 189 | aux = it->funcs; |
0f113f3e MC |
190 | if (aux && aux->asn1_cb) |
191 | asn1_cb = aux->asn1_cb; | |
192 | else | |
193 | asn1_cb = 0; | |
194 | ||
4cabbb9f | 195 | if (++depth > ASN1_MAX_CONSTRUCTED_NEST) { |
9311d0c4 | 196 | ERR_raise(ERR_LIB_ASN1, ASN1_R_NESTED_TOO_DEEP); |
4cabbb9f MC |
197 | goto err; |
198 | } | |
199 | ||
0f113f3e MC |
200 | switch (it->itype) { |
201 | case ASN1_ITYPE_PRIMITIVE: | |
202 | if (it->templates) { | |
203 | /* | |
204 | * tagging or OPTIONAL is currently illegal on an item template | |
205 | * because the flags can't get passed down. In practice this | |
206 | * isn't a problem: we include the relevant flags from the item | |
207 | * template in the template itself. | |
208 | */ | |
209 | if ((tag != -1) || opt) { | |
9311d0c4 RL |
210 | ERR_raise(ERR_LIB_ASN1, |
211 | ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE); | |
0f113f3e MC |
212 | goto err; |
213 | } | |
dea2878f MC |
214 | return asn1_template_ex_d2i(pval, in, len, it->templates, opt, ctx, |
215 | depth, libctx, propq); | |
0f113f3e MC |
216 | } |
217 | return asn1_d2i_ex_primitive(pval, in, len, it, | |
218 | tag, aclass, opt, ctx); | |
0f113f3e MC |
219 | |
220 | case ASN1_ITYPE_MSTRING: | |
43a7033a MC |
221 | /* |
222 | * It never makes sense for multi-strings to have implicit tagging, so | |
223 | * if tag != -1, then this looks like an error in the template. | |
224 | */ | |
225 | if (tag != -1) { | |
226 | ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE); | |
227 | goto err; | |
228 | } | |
229 | ||
0f113f3e MC |
230 | p = *in; |
231 | /* Just read in tag and class */ | |
232 | ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL, | |
233 | &p, len, -1, 0, 1, ctx); | |
234 | if (!ret) { | |
9311d0c4 | 235 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
236 | goto err; |
237 | } | |
238 | ||
239 | /* Must be UNIVERSAL class */ | |
240 | if (oclass != V_ASN1_UNIVERSAL) { | |
241 | /* If OPTIONAL, assume this is OK */ | |
242 | if (opt) | |
243 | return -1; | |
9311d0c4 | 244 | ERR_raise(ERR_LIB_ASN1, ASN1_R_MSTRING_NOT_UNIVERSAL); |
0f113f3e MC |
245 | goto err; |
246 | } | |
43a7033a | 247 | |
0f113f3e MC |
248 | /* Check tag matches bit map */ |
249 | if (!(ASN1_tag2bit(otag) & it->utype)) { | |
250 | /* If OPTIONAL, assume this is OK */ | |
251 | if (opt) | |
252 | return -1; | |
9311d0c4 | 253 | ERR_raise(ERR_LIB_ASN1, ASN1_R_MSTRING_WRONG_TAG); |
0f113f3e MC |
254 | goto err; |
255 | } | |
256 | return asn1_d2i_ex_primitive(pval, in, len, it, otag, 0, 0, ctx); | |
257 | ||
258 | case ASN1_ITYPE_EXTERN: | |
259 | /* Use new style d2i */ | |
260 | ef = it->funcs; | |
dea2878f MC |
261 | if (ef->asn1_ex_d2i_ex != NULL) |
262 | return ef->asn1_ex_d2i_ex(pval, in, len, it, tag, aclass, opt, ctx, | |
263 | libctx, propq); | |
0f113f3e MC |
264 | return ef->asn1_ex_d2i(pval, in, len, it, tag, aclass, opt, ctx); |
265 | ||
0f113f3e | 266 | case ASN1_ITYPE_CHOICE: |
43a7033a MC |
267 | /* |
268 | * It never makes sense for CHOICE types to have implicit tagging, so | |
269 | * if tag != -1, then this looks like an error in the template. | |
270 | */ | |
271 | if (tag != -1) { | |
272 | ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_TEMPLATE); | |
273 | goto err; | |
274 | } | |
275 | ||
0f113f3e MC |
276 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) |
277 | goto auxerr; | |
8106d61c DSH |
278 | if (*pval) { |
279 | /* Free up and zero CHOICE value if initialised */ | |
adf7e6d1 | 280 | i = ossl_asn1_get_choice_selector(pval, it); |
8106d61c DSH |
281 | if ((i >= 0) && (i < it->tcount)) { |
282 | tt = it->templates + i; | |
adf7e6d1 SL |
283 | pchptr = ossl_asn1_get_field_ptr(pval, tt); |
284 | ossl_asn1_template_free(pchptr, tt); | |
285 | ossl_asn1_set_choice_selector(pval, -1, it); | |
8106d61c | 286 | } |
dea2878f | 287 | } else if (!ossl_asn1_item_ex_new_intern(pval, it, libctx, propq)) { |
9311d0c4 | 288 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
289 | goto err; |
290 | } | |
291 | /* CHOICE type, try each possibility in turn */ | |
292 | p = *in; | |
293 | for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) { | |
adf7e6d1 | 294 | pchptr = ossl_asn1_get_field_ptr(pval, tt); |
0f113f3e MC |
295 | /* |
296 | * We mark field as OPTIONAL so its absence can be recognised. | |
297 | */ | |
dea2878f MC |
298 | ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx, depth, |
299 | libctx, propq); | |
0f113f3e MC |
300 | /* If field not present, try the next one */ |
301 | if (ret == -1) | |
302 | continue; | |
303 | /* If positive return, read OK, break loop */ | |
304 | if (ret > 0) | |
305 | break; | |
f962541d DSH |
306 | /* |
307 | * Must be an ASN1 parsing error. | |
308 | * Free up any partial choice value | |
309 | */ | |
adf7e6d1 | 310 | ossl_asn1_template_free(pchptr, tt); |
0f113f3e | 311 | errtt = tt; |
9311d0c4 | 312 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
313 | goto err; |
314 | } | |
315 | ||
316 | /* Did we fall off the end without reading anything? */ | |
317 | if (i == it->tcount) { | |
318 | /* If OPTIONAL, this is OK */ | |
319 | if (opt) { | |
320 | /* Free and zero it */ | |
321 | ASN1_item_ex_free(pval, it); | |
322 | return -1; | |
323 | } | |
9311d0c4 | 324 | ERR_raise(ERR_LIB_ASN1, ASN1_R_NO_MATCHING_CHOICE_TYPE); |
0f113f3e MC |
325 | goto err; |
326 | } | |
327 | ||
adf7e6d1 | 328 | ossl_asn1_set_choice_selector(pval, i, it); |
f962541d | 329 | |
0f113f3e MC |
330 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) |
331 | goto auxerr; | |
a46c9789 | 332 | *in = p; |
0f113f3e MC |
333 | return 1; |
334 | ||
335 | case ASN1_ITYPE_NDEF_SEQUENCE: | |
336 | case ASN1_ITYPE_SEQUENCE: | |
337 | p = *in; | |
338 | tmplen = len; | |
339 | ||
340 | /* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */ | |
341 | if (tag == -1) { | |
342 | tag = V_ASN1_SEQUENCE; | |
343 | aclass = V_ASN1_UNIVERSAL; | |
344 | } | |
345 | /* Get SEQUENCE length and update len, p */ | |
346 | ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst, | |
347 | &p, len, tag, aclass, opt, ctx); | |
348 | if (!ret) { | |
9311d0c4 | 349 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
350 | goto err; |
351 | } else if (ret == -1) | |
352 | return -1; | |
353 | if (aux && (aux->flags & ASN1_AFLG_BROKEN)) { | |
354 | len = tmplen - (p - *in); | |
355 | seq_nolen = 1; | |
356 | } | |
357 | /* If indefinite we don't do a length check */ | |
358 | else | |
359 | seq_nolen = seq_eoc; | |
360 | if (!cst) { | |
9311d0c4 | 361 | ERR_raise(ERR_LIB_ASN1, ASN1_R_SEQUENCE_NOT_CONSTRUCTED); |
0f113f3e MC |
362 | goto err; |
363 | } | |
364 | ||
dea2878f MC |
365 | if (*pval == NULL |
366 | && !ossl_asn1_item_ex_new_intern(pval, it, libctx, propq)) { | |
9311d0c4 | 367 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
368 | goto err; |
369 | } | |
370 | ||
371 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it, NULL)) | |
372 | goto auxerr; | |
373 | ||
8106d61c DSH |
374 | /* Free up and zero any ADB found */ |
375 | for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) { | |
376 | if (tt->flags & ASN1_TFLG_ADB_MASK) { | |
377 | const ASN1_TEMPLATE *seqtt; | |
378 | ASN1_VALUE **pseqval; | |
adf7e6d1 | 379 | seqtt = ossl_asn1_do_adb(*pval, tt, 0); |
fdcb499c | 380 | if (seqtt == NULL) |
bace847e | 381 | continue; |
adf7e6d1 SL |
382 | pseqval = ossl_asn1_get_field_ptr(pval, seqtt); |
383 | ossl_asn1_template_free(pseqval, seqtt); | |
8106d61c DSH |
384 | } |
385 | } | |
386 | ||
0f113f3e MC |
387 | /* Get each field entry */ |
388 | for (i = 0, tt = it->templates; i < it->tcount; i++, tt++) { | |
389 | const ASN1_TEMPLATE *seqtt; | |
390 | ASN1_VALUE **pseqval; | |
adf7e6d1 | 391 | seqtt = ossl_asn1_do_adb(*pval, tt, 1); |
fdcb499c | 392 | if (seqtt == NULL) |
0f113f3e | 393 | goto err; |
adf7e6d1 | 394 | pseqval = ossl_asn1_get_field_ptr(pval, seqtt); |
0f113f3e MC |
395 | /* Have we ran out of data? */ |
396 | if (!len) | |
397 | break; | |
398 | q = p; | |
399 | if (asn1_check_eoc(&p, len)) { | |
400 | if (!seq_eoc) { | |
9311d0c4 | 401 | ERR_raise(ERR_LIB_ASN1, ASN1_R_UNEXPECTED_EOC); |
0f113f3e MC |
402 | goto err; |
403 | } | |
404 | len -= p - q; | |
405 | seq_eoc = 0; | |
0f113f3e MC |
406 | break; |
407 | } | |
408 | /* | |
409 | * This determines the OPTIONAL flag value. The field cannot be | |
410 | * omitted if it is the last of a SEQUENCE and there is still | |
411 | * data to be read. This isn't strictly necessary but it | |
412 | * increases efficiency in some cases. | |
413 | */ | |
414 | if (i == (it->tcount - 1)) | |
415 | isopt = 0; | |
416 | else | |
417 | isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL); | |
418 | /* | |
419 | * attempt to read in field, allowing each to be OPTIONAL | |
420 | */ | |
421 | ||
4cabbb9f | 422 | ret = asn1_template_ex_d2i(pseqval, &p, len, seqtt, isopt, ctx, |
dea2878f | 423 | depth, libctx, propq); |
0f113f3e MC |
424 | if (!ret) { |
425 | errtt = seqtt; | |
426 | goto err; | |
427 | } else if (ret == -1) { | |
428 | /* | |
429 | * OPTIONAL component absent. Free and zero the field. | |
430 | */ | |
adf7e6d1 | 431 | ossl_asn1_template_free(pseqval, seqtt); |
0f113f3e MC |
432 | continue; |
433 | } | |
434 | /* Update length */ | |
435 | len -= p - q; | |
436 | } | |
437 | ||
438 | /* Check for EOC if expecting one */ | |
439 | if (seq_eoc && !asn1_check_eoc(&p, len)) { | |
9311d0c4 | 440 | ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC); |
0f113f3e MC |
441 | goto err; |
442 | } | |
443 | /* Check all data read */ | |
444 | if (!seq_nolen && len) { | |
9311d0c4 | 445 | ERR_raise(ERR_LIB_ASN1, ASN1_R_SEQUENCE_LENGTH_MISMATCH); |
0f113f3e MC |
446 | goto err; |
447 | } | |
448 | ||
449 | /* | |
450 | * If we get here we've got no more data in the SEQUENCE, however we | |
451 | * may not have read all fields so check all remaining are OPTIONAL | |
452 | * and clear any that are. | |
453 | */ | |
454 | for (; i < it->tcount; tt++, i++) { | |
455 | const ASN1_TEMPLATE *seqtt; | |
adf7e6d1 | 456 | seqtt = ossl_asn1_do_adb(*pval, tt, 1); |
fdcb499c | 457 | if (seqtt == NULL) |
0f113f3e MC |
458 | goto err; |
459 | if (seqtt->flags & ASN1_TFLG_OPTIONAL) { | |
460 | ASN1_VALUE **pseqval; | |
adf7e6d1 SL |
461 | pseqval = ossl_asn1_get_field_ptr(pval, seqtt); |
462 | ossl_asn1_template_free(pseqval, seqtt); | |
0f113f3e MC |
463 | } else { |
464 | errtt = seqtt; | |
9311d0c4 | 465 | ERR_raise(ERR_LIB_ASN1, ASN1_R_FIELD_MISSING); |
0f113f3e MC |
466 | goto err; |
467 | } | |
468 | } | |
469 | /* Save encoding */ | |
adf7e6d1 | 470 | if (!ossl_asn1_enc_save(pval, *in, p - *in, it)) |
0f113f3e | 471 | goto auxerr; |
0f113f3e MC |
472 | if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it, NULL)) |
473 | goto auxerr; | |
a46c9789 | 474 | *in = p; |
0f113f3e MC |
475 | return 1; |
476 | ||
477 | default: | |
478 | return 0; | |
479 | } | |
480 | auxerr: | |
9311d0c4 | 481 | ERR_raise(ERR_LIB_ASN1, ASN1_R_AUX_ERROR); |
0f113f3e | 482 | err: |
0f113f3e MC |
483 | if (errtt) |
484 | ERR_add_error_data(4, "Field=", errtt->field_name, | |
485 | ", Type=", it->sname); | |
486 | else | |
487 | ERR_add_error_data(2, "Type=", it->sname); | |
488 | return 0; | |
489 | } | |
490 | ||
491 | /* | |
492 | * Templates are handled with two separate functions. One handles any | |
493 | * EXPLICIT tag and the other handles the rest. | |
9d6b1ce6 DSH |
494 | */ |
495 | ||
8845420f | 496 | static int asn1_template_ex_d2i(ASN1_VALUE **val, |
0f113f3e MC |
497 | const unsigned char **in, long inlen, |
498 | const ASN1_TEMPLATE *tt, char opt, | |
dea2878f MC |
499 | ASN1_TLC *ctx, int depth, |
500 | OSSL_LIB_CTX *libctx, const char *propq) | |
0f113f3e MC |
501 | { |
502 | int flags, aclass; | |
503 | int ret; | |
504 | long len; | |
505 | const unsigned char *p, *q; | |
506 | char exp_eoc; | |
507 | if (!val) | |
508 | return 0; | |
509 | flags = tt->flags; | |
510 | aclass = flags & ASN1_TFLG_TAG_CLASS; | |
511 | ||
512 | p = *in; | |
513 | ||
514 | /* Check if EXPLICIT tag expected */ | |
515 | if (flags & ASN1_TFLG_EXPTAG) { | |
516 | char cst; | |
517 | /* | |
518 | * Need to work out amount of data available to the inner content and | |
519 | * where it starts: so read in EXPLICIT header to get the info. | |
520 | */ | |
521 | ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst, | |
522 | &p, inlen, tt->tag, aclass, opt, ctx); | |
523 | q = p; | |
524 | if (!ret) { | |
9311d0c4 | 525 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
526 | return 0; |
527 | } else if (ret == -1) | |
528 | return -1; | |
529 | if (!cst) { | |
9311d0c4 | 530 | ERR_raise(ERR_LIB_ASN1, ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED); |
0f113f3e MC |
531 | return 0; |
532 | } | |
533 | /* We've found the field so it can't be OPTIONAL now */ | |
dea2878f MC |
534 | ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx, depth, libctx, |
535 | propq); | |
0f113f3e | 536 | if (!ret) { |
9311d0c4 | 537 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
538 | return 0; |
539 | } | |
540 | /* We read the field in OK so update length */ | |
541 | len -= p - q; | |
542 | if (exp_eoc) { | |
543 | /* If NDEF we must have an EOC here */ | |
544 | if (!asn1_check_eoc(&p, len)) { | |
9311d0c4 | 545 | ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC); |
0f113f3e MC |
546 | goto err; |
547 | } | |
548 | } else { | |
549 | /* | |
550 | * Otherwise we must hit the EXPLICIT tag end or its an error | |
551 | */ | |
552 | if (len) { | |
9311d0c4 | 553 | ERR_raise(ERR_LIB_ASN1, ASN1_R_EXPLICIT_LENGTH_MISMATCH); |
0f113f3e MC |
554 | goto err; |
555 | } | |
556 | } | |
557 | } else | |
dea2878f MC |
558 | return asn1_template_noexp_d2i(val, in, inlen, tt, opt, ctx, depth, |
559 | libctx, propq); | |
0f113f3e MC |
560 | |
561 | *in = p; | |
562 | return 1; | |
563 | ||
564 | err: | |
0f113f3e MC |
565 | return 0; |
566 | } | |
9d6b1ce6 | 567 | |
8845420f | 568 | static int asn1_template_noexp_d2i(ASN1_VALUE **val, |
0f113f3e MC |
569 | const unsigned char **in, long len, |
570 | const ASN1_TEMPLATE *tt, char opt, | |
dea2878f MC |
571 | ASN1_TLC *ctx, int depth, |
572 | OSSL_LIB_CTX *libctx, const char *propq) | |
0f113f3e MC |
573 | { |
574 | int flags, aclass; | |
575 | int ret; | |
de17bd5d | 576 | ASN1_VALUE *tval; |
0f113f3e MC |
577 | const unsigned char *p, *q; |
578 | if (!val) | |
579 | return 0; | |
580 | flags = tt->flags; | |
581 | aclass = flags & ASN1_TFLG_TAG_CLASS; | |
582 | ||
583 | p = *in; | |
0f113f3e | 584 | |
de17bd5d DSH |
585 | /* |
586 | * If field is embedded then val needs fixing so it is a pointer to | |
587 | * a pointer to a field. | |
588 | */ | |
589 | if (tt->flags & ASN1_TFLG_EMBED) { | |
590 | tval = (ASN1_VALUE *)val; | |
591 | val = &tval; | |
592 | } | |
593 | ||
0f113f3e MC |
594 | if (flags & ASN1_TFLG_SK_MASK) { |
595 | /* SET OF, SEQUENCE OF */ | |
596 | int sktag, skaclass; | |
597 | char sk_eoc; | |
598 | /* First work out expected inner tag value */ | |
599 | if (flags & ASN1_TFLG_IMPTAG) { | |
600 | sktag = tt->tag; | |
601 | skaclass = aclass; | |
602 | } else { | |
603 | skaclass = V_ASN1_UNIVERSAL; | |
604 | if (flags & ASN1_TFLG_SET_OF) | |
605 | sktag = V_ASN1_SET; | |
606 | else | |
607 | sktag = V_ASN1_SEQUENCE; | |
608 | } | |
609 | /* Get the tag */ | |
610 | ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL, | |
611 | &p, len, sktag, skaclass, opt, ctx); | |
612 | if (!ret) { | |
9311d0c4 | 613 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
614 | return 0; |
615 | } else if (ret == -1) | |
616 | return -1; | |
12a765a5 | 617 | if (*val == NULL) |
1f5e0f92 | 618 | *val = (ASN1_VALUE *)sk_ASN1_VALUE_new_null(); |
0f113f3e MC |
619 | else { |
620 | /* | |
621 | * We've got a valid STACK: free up any items present | |
622 | */ | |
623 | STACK_OF(ASN1_VALUE) *sktmp = (STACK_OF(ASN1_VALUE) *)*val; | |
624 | ASN1_VALUE *vtmp; | |
625 | while (sk_ASN1_VALUE_num(sktmp) > 0) { | |
626 | vtmp = sk_ASN1_VALUE_pop(sktmp); | |
627 | ASN1_item_ex_free(&vtmp, ASN1_ITEM_ptr(tt->item)); | |
628 | } | |
629 | } | |
630 | ||
12a765a5 | 631 | if (*val == NULL) { |
e077455e | 632 | ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB); |
0f113f3e MC |
633 | goto err; |
634 | } | |
635 | ||
636 | /* Read as many items as we can */ | |
637 | while (len > 0) { | |
638 | ASN1_VALUE *skfield; | |
639 | q = p; | |
640 | /* See if EOC found */ | |
641 | if (asn1_check_eoc(&p, len)) { | |
642 | if (!sk_eoc) { | |
9311d0c4 | 643 | ERR_raise(ERR_LIB_ASN1, ASN1_R_UNEXPECTED_EOC); |
0f113f3e MC |
644 | goto err; |
645 | } | |
646 | len -= p - q; | |
647 | sk_eoc = 0; | |
648 | break; | |
649 | } | |
650 | skfield = NULL; | |
7f608e4b | 651 | if (asn1_item_embed_d2i(&skfield, &p, len, |
4cabbb9f | 652 | ASN1_ITEM_ptr(tt->item), -1, 0, 0, ctx, |
7f608e4b | 653 | depth, libctx, propq) <= 0) { |
9311d0c4 | 654 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
1400f013 EK |
655 | /* |skfield| may be partially allocated despite failure. */ |
656 | ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item)); | |
0f113f3e MC |
657 | goto err; |
658 | } | |
659 | len -= p - q; | |
660 | if (!sk_ASN1_VALUE_push((STACK_OF(ASN1_VALUE) *)*val, skfield)) { | |
e077455e | 661 | ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB); |
33a23fa6 | 662 | ASN1_item_free(skfield, ASN1_ITEM_ptr(tt->item)); |
0f113f3e MC |
663 | goto err; |
664 | } | |
665 | } | |
666 | if (sk_eoc) { | |
9311d0c4 | 667 | ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC); |
0f113f3e MC |
668 | goto err; |
669 | } | |
670 | } else if (flags & ASN1_TFLG_IMPTAG) { | |
671 | /* IMPLICIT tagging */ | |
f93ad22f DSH |
672 | ret = asn1_item_embed_d2i(val, &p, len, |
673 | ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, | |
dea2878f | 674 | ctx, depth, libctx, propq); |
0f113f3e | 675 | if (!ret) { |
9311d0c4 | 676 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
677 | goto err; |
678 | } else if (ret == -1) | |
679 | return -1; | |
680 | } else { | |
681 | /* Nothing special */ | |
f93ad22f | 682 | ret = asn1_item_embed_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item), |
dea2878f | 683 | -1, 0, opt, ctx, depth, libctx, propq); |
0f113f3e | 684 | if (!ret) { |
9311d0c4 | 685 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
686 | goto err; |
687 | } else if (ret == -1) | |
688 | return -1; | |
689 | } | |
690 | ||
691 | *in = p; | |
692 | return 1; | |
693 | ||
694 | err: | |
0f113f3e MC |
695 | return 0; |
696 | } | |
9d6b1ce6 | 697 | |
8845420f | 698 | static int asn1_d2i_ex_primitive(ASN1_VALUE **pval, |
0f113f3e MC |
699 | const unsigned char **in, long inlen, |
700 | const ASN1_ITEM *it, | |
701 | int tag, int aclass, char opt, ASN1_TLC *ctx) | |
702 | { | |
703 | int ret = 0, utype; | |
704 | long plen; | |
705 | char cst, inf, free_cont = 0; | |
706 | const unsigned char *p; | |
3eb70c5e | 707 | BUF_MEM buf = { 0, NULL, 0, 0 }; |
0f113f3e MC |
708 | const unsigned char *cont = NULL; |
709 | long len; | |
12a765a5 RS |
710 | |
711 | if (pval == NULL) { | |
9311d0c4 | 712 | ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_NULL); |
0f113f3e MC |
713 | return 0; /* Should never happen */ |
714 | } | |
715 | ||
716 | if (it->itype == ASN1_ITYPE_MSTRING) { | |
717 | utype = tag; | |
718 | tag = -1; | |
719 | } else | |
720 | utype = it->utype; | |
721 | ||
722 | if (utype == V_ASN1_ANY) { | |
723 | /* If type is ANY need to figure out type from tag */ | |
724 | unsigned char oclass; | |
725 | if (tag >= 0) { | |
9311d0c4 | 726 | ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_TAGGED_ANY); |
0f113f3e MC |
727 | return 0; |
728 | } | |
729 | if (opt) { | |
9311d0c4 | 730 | ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_OPTIONAL_ANY); |
0f113f3e MC |
731 | return 0; |
732 | } | |
733 | p = *in; | |
734 | ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL, | |
735 | &p, inlen, -1, 0, 0, ctx); | |
736 | if (!ret) { | |
9311d0c4 | 737 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
738 | return 0; |
739 | } | |
740 | if (oclass != V_ASN1_UNIVERSAL) | |
741 | utype = V_ASN1_OTHER; | |
742 | } | |
743 | if (tag == -1) { | |
744 | tag = utype; | |
745 | aclass = V_ASN1_UNIVERSAL; | |
746 | } | |
747 | p = *in; | |
748 | /* Check header */ | |
749 | ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst, | |
750 | &p, inlen, tag, aclass, opt, ctx); | |
751 | if (!ret) { | |
9311d0c4 | 752 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
753 | return 0; |
754 | } else if (ret == -1) | |
755 | return -1; | |
756 | ret = 0; | |
757 | /* SEQUENCE, SET and "OTHER" are left in encoded form */ | |
758 | if ((utype == V_ASN1_SEQUENCE) | |
759 | || (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER)) { | |
760 | /* | |
761 | * Clear context cache for type OTHER because the auto clear when we | |
60250017 | 762 | * have a exact match won't work |
0f113f3e MC |
763 | */ |
764 | if (utype == V_ASN1_OTHER) { | |
765 | asn1_tlc_clear(ctx); | |
766 | } | |
767 | /* SEQUENCE and SET must be constructed */ | |
768 | else if (!cst) { | |
9311d0c4 | 769 | ERR_raise(ERR_LIB_ASN1, ASN1_R_TYPE_NOT_CONSTRUCTED); |
0f113f3e MC |
770 | return 0; |
771 | } | |
772 | ||
773 | cont = *in; | |
774 | /* If indefinite length constructed find the real end */ | |
775 | if (inf) { | |
776 | if (!asn1_find_end(&p, plen, inf)) | |
777 | goto err; | |
778 | len = p - cont; | |
779 | } else { | |
780 | len = p - cont + plen; | |
781 | p += plen; | |
0f113f3e MC |
782 | } |
783 | } else if (cst) { | |
784 | if (utype == V_ASN1_NULL || utype == V_ASN1_BOOLEAN | |
785 | || utype == V_ASN1_OBJECT || utype == V_ASN1_INTEGER | |
786 | || utype == V_ASN1_ENUMERATED) { | |
9311d0c4 | 787 | ERR_raise(ERR_LIB_ASN1, ASN1_R_TYPE_NOT_PRIMITIVE); |
0f113f3e MC |
788 | return 0; |
789 | } | |
3eb70c5e F |
790 | |
791 | /* Free any returned 'buf' content */ | |
792 | free_cont = 1; | |
0f113f3e MC |
793 | /* |
794 | * Should really check the internal tags are correct but some things | |
795 | * may get this wrong. The relevant specs say that constructed string | |
796 | * types should be OCTET STRINGs internally irrespective of the type. | |
797 | * So instead just check for UNIVERSAL class and ignore the tag. | |
798 | */ | |
799 | if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL, 0)) { | |
0f113f3e MC |
800 | goto err; |
801 | } | |
802 | len = buf.length; | |
803 | /* Append a final null to string */ | |
804 | if (!BUF_MEM_grow_clean(&buf, len + 1)) { | |
e077455e | 805 | ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB); |
3eb70c5e | 806 | goto err; |
0f113f3e MC |
807 | } |
808 | buf.data[len] = 0; | |
809 | cont = (const unsigned char *)buf.data; | |
0f113f3e MC |
810 | } else { |
811 | cont = p; | |
812 | len = plen; | |
813 | p += plen; | |
814 | } | |
815 | ||
816 | /* We now have content length and type: translate into a structure */ | |
3eb70c5e | 817 | /* asn1_ex_c2i may reuse allocated buffer, and so sets free_cont to 0 */ |
0f113f3e MC |
818 | if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it)) |
819 | goto err; | |
820 | ||
821 | *in = p; | |
822 | ret = 1; | |
823 | err: | |
b548a1f1 | 824 | if (free_cont) |
0f113f3e MC |
825 | OPENSSL_free(buf.data); |
826 | return ret; | |
827 | } | |
9d6b1ce6 DSH |
828 | |
829 | /* Translate ASN1 content octets into a structure */ | |
830 | ||
23dc1706 DSH |
831 | static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, |
832 | int utype, char *free_cont, const ASN1_ITEM *it) | |
0f113f3e MC |
833 | { |
834 | ASN1_VALUE **opval = NULL; | |
835 | ASN1_STRING *stmp; | |
836 | ASN1_TYPE *typ = NULL; | |
837 | int ret = 0; | |
838 | const ASN1_PRIMITIVE_FUNCS *pf; | |
839 | ASN1_INTEGER **tint; | |
840 | pf = it->funcs; | |
841 | ||
842 | if (pf && pf->prim_c2i) | |
843 | return pf->prim_c2i(pval, cont, len, utype, free_cont, it); | |
844 | /* If ANY type clear type and set pointer to internal value */ | |
845 | if (it->utype == V_ASN1_ANY) { | |
12a765a5 | 846 | if (*pval == NULL) { |
0f113f3e MC |
847 | typ = ASN1_TYPE_new(); |
848 | if (typ == NULL) | |
849 | goto err; | |
850 | *pval = (ASN1_VALUE *)typ; | |
851 | } else | |
852 | typ = (ASN1_TYPE *)*pval; | |
853 | ||
854 | if (utype != typ->type) | |
855 | ASN1_TYPE_set(typ, utype, NULL); | |
856 | opval = pval; | |
857 | pval = &typ->value.asn1_value; | |
858 | } | |
859 | switch (utype) { | |
860 | case V_ASN1_OBJECT: | |
adf7e6d1 | 861 | if (!ossl_c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len)) |
0f113f3e MC |
862 | goto err; |
863 | break; | |
864 | ||
865 | case V_ASN1_NULL: | |
866 | if (len) { | |
9311d0c4 | 867 | ERR_raise(ERR_LIB_ASN1, ASN1_R_NULL_IS_WRONG_LENGTH); |
0f113f3e MC |
868 | goto err; |
869 | } | |
870 | *pval = (ASN1_VALUE *)1; | |
871 | break; | |
872 | ||
873 | case V_ASN1_BOOLEAN: | |
874 | if (len != 1) { | |
9311d0c4 | 875 | ERR_raise(ERR_LIB_ASN1, ASN1_R_BOOLEAN_IS_WRONG_LENGTH); |
0f113f3e MC |
876 | goto err; |
877 | } else { | |
878 | ASN1_BOOLEAN *tbool; | |
879 | tbool = (ASN1_BOOLEAN *)pval; | |
880 | *tbool = *cont; | |
881 | } | |
882 | break; | |
883 | ||
884 | case V_ASN1_BIT_STRING: | |
adf7e6d1 | 885 | if (!ossl_c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len)) |
0f113f3e MC |
886 | goto err; |
887 | break; | |
888 | ||
889 | case V_ASN1_INTEGER: | |
0f113f3e | 890 | case V_ASN1_ENUMERATED: |
0f113f3e | 891 | tint = (ASN1_INTEGER **)pval; |
adf7e6d1 | 892 | if (!ossl_c2i_ASN1_INTEGER(tint, &cont, len)) |
0f113f3e MC |
893 | goto err; |
894 | /* Fixup type to match the expected form */ | |
895 | (*tint)->type = utype | ((*tint)->type & V_ASN1_NEG); | |
896 | break; | |
897 | ||
898 | case V_ASN1_OCTET_STRING: | |
899 | case V_ASN1_NUMERICSTRING: | |
900 | case V_ASN1_PRINTABLESTRING: | |
901 | case V_ASN1_T61STRING: | |
902 | case V_ASN1_VIDEOTEXSTRING: | |
903 | case V_ASN1_IA5STRING: | |
904 | case V_ASN1_UTCTIME: | |
905 | case V_ASN1_GENERALIZEDTIME: | |
906 | case V_ASN1_GRAPHICSTRING: | |
907 | case V_ASN1_VISIBLESTRING: | |
908 | case V_ASN1_GENERALSTRING: | |
909 | case V_ASN1_UNIVERSALSTRING: | |
910 | case V_ASN1_BMPSTRING: | |
911 | case V_ASN1_UTF8STRING: | |
912 | case V_ASN1_OTHER: | |
913 | case V_ASN1_SET: | |
914 | case V_ASN1_SEQUENCE: | |
915 | default: | |
916 | if (utype == V_ASN1_BMPSTRING && (len & 1)) { | |
9311d0c4 | 917 | ERR_raise(ERR_LIB_ASN1, ASN1_R_BMPSTRING_IS_WRONG_LENGTH); |
0f113f3e MC |
918 | goto err; |
919 | } | |
920 | if (utype == V_ASN1_UNIVERSALSTRING && (len & 3)) { | |
9311d0c4 | 921 | ERR_raise(ERR_LIB_ASN1, ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH); |
0f113f3e | 922 | goto err; |
eadd8c47 JS |
923 | } |
924 | if (utype == V_ASN1_GENERALIZEDTIME && (len < 15)) { | |
925 | ERR_raise(ERR_LIB_ASN1, ASN1_R_GENERALIZEDTIME_IS_TOO_SHORT); | |
926 | goto err; | |
927 | } | |
928 | if (utype == V_ASN1_UTCTIME && (len < 13)) { | |
929 | ERR_raise(ERR_LIB_ASN1, ASN1_R_UTCTIME_IS_TOO_SHORT); | |
930 | goto err; | |
0f113f3e MC |
931 | } |
932 | /* All based on ASN1_STRING and handled the same */ | |
12a765a5 | 933 | if (*pval == NULL) { |
0f113f3e | 934 | stmp = ASN1_STRING_type_new(utype); |
90945fa3 | 935 | if (stmp == NULL) { |
e077455e | 936 | ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB); |
0f113f3e MC |
937 | goto err; |
938 | } | |
939 | *pval = (ASN1_VALUE *)stmp; | |
940 | } else { | |
941 | stmp = (ASN1_STRING *)*pval; | |
942 | stmp->type = utype; | |
943 | } | |
944 | /* If we've already allocated a buffer use it */ | |
945 | if (*free_cont) { | |
33847508 | 946 | ASN1_STRING_set0(stmp, (unsigned char *)cont /* UGLY CAST! */, len); |
0f113f3e MC |
947 | *free_cont = 0; |
948 | } else { | |
949 | if (!ASN1_STRING_set(stmp, cont, len)) { | |
e077455e | 950 | ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB); |
0f113f3e MC |
951 | ASN1_STRING_free(stmp); |
952 | *pval = NULL; | |
953 | goto err; | |
954 | } | |
955 | } | |
956 | break; | |
957 | } | |
958 | /* If ASN1_ANY and NULL type fix up value */ | |
959 | if (typ && (utype == V_ASN1_NULL)) | |
960 | typ->value.ptr = NULL; | |
961 | ||
962 | ret = 1; | |
963 | err: | |
964 | if (!ret) { | |
965 | ASN1_TYPE_free(typ); | |
966 | if (opval) | |
967 | *opval = NULL; | |
968 | } | |
969 | return ret; | |
970 | } | |
971 | ||
972 | /* | |
973 | * This function finds the end of an ASN1 structure when passed its maximum | |
974 | * length, whether it is indefinite length and a pointer to the content. This | |
975 | * is more efficient than calling asn1_collect because it does not recurse on | |
976 | * each indefinite length header. | |
e1cc0671 DSH |
977 | */ |
978 | ||
979 | static int asn1_find_end(const unsigned char **in, long len, char inf) | |
0f113f3e | 980 | { |
bd95d64a | 981 | uint32_t expected_eoc; |
0f113f3e MC |
982 | long plen; |
983 | const unsigned char *p = *in, *q; | |
984 | /* If not indefinite length constructed just add length */ | |
985 | if (inf == 0) { | |
986 | *in += len; | |
987 | return 1; | |
988 | } | |
989 | expected_eoc = 1; | |
990 | /* | |
991 | * Indefinite length constructed form. Find the end when enough EOCs are | |
992 | * found. If more indefinite length constructed headers are encountered | |
993 | * increment the expected eoc count otherwise just skip to the end of the | |
994 | * data. | |
995 | */ | |
996 | while (len > 0) { | |
997 | if (asn1_check_eoc(&p, len)) { | |
998 | expected_eoc--; | |
999 | if (expected_eoc == 0) | |
1000 | break; | |
1001 | len -= 2; | |
1002 | continue; | |
1003 | } | |
1004 | q = p; | |
1005 | /* Just read in a header: only care about the length */ | |
1006 | if (!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len, | |
1007 | -1, 0, 0, NULL)) { | |
9311d0c4 | 1008 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
1009 | return 0; |
1010 | } | |
bd95d64a DSH |
1011 | if (inf) { |
1012 | if (expected_eoc == UINT32_MAX) { | |
9311d0c4 | 1013 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
bd95d64a DSH |
1014 | return 0; |
1015 | } | |
0f113f3e | 1016 | expected_eoc++; |
bd95d64a | 1017 | } else { |
0f113f3e | 1018 | p += plen; |
bd95d64a | 1019 | } |
0f113f3e MC |
1020 | len -= p - q; |
1021 | } | |
1022 | if (expected_eoc) { | |
9311d0c4 | 1023 | ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC); |
0f113f3e MC |
1024 | return 0; |
1025 | } | |
1026 | *in = p; | |
1027 | return 1; | |
1028 | } | |
1029 | ||
1030 | /* | |
0d4fb843 | 1031 | * This function collects the asn1 data from a constructed string type into |
0f113f3e MC |
1032 | * a buffer. The values of 'in' and 'len' should refer to the contents of the |
1033 | * constructed type and 'inf' should be set if it is indefinite length. | |
9d6b1ce6 DSH |
1034 | */ |
1035 | ||
854a225a | 1036 | #ifndef ASN1_MAX_STRING_NEST |
0f113f3e MC |
1037 | /* |
1038 | * This determines how many levels of recursion are permitted in ASN1 string | |
1039 | * types. If it is not limited stack overflows can occur. If set to zero no | |
1040 | * recursion is allowed at all. Although zero should be adequate examples | |
1041 | * exist that require a value of 1. So 5 should be more than enough. | |
854a225a | 1042 | */ |
0f113f3e | 1043 | # define ASN1_MAX_STRING_NEST 5 |
854a225a DSH |
1044 | #endif |
1045 | ||
8845420f | 1046 | static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len, |
0f113f3e MC |
1047 | char inf, int tag, int aclass, int depth) |
1048 | { | |
1049 | const unsigned char *p, *q; | |
1050 | long plen; | |
1051 | char cst, ininf; | |
1052 | p = *in; | |
1053 | inf &= 1; | |
1054 | /* | |
1055 | * If no buffer and not indefinite length constructed just pass over the | |
1056 | * encoded data | |
1057 | */ | |
1058 | if (!buf && !inf) { | |
1059 | *in += len; | |
1060 | return 1; | |
1061 | } | |
1062 | while (len > 0) { | |
1063 | q = p; | |
1064 | /* Check for EOC */ | |
1065 | if (asn1_check_eoc(&p, len)) { | |
1066 | /* | |
1067 | * EOC is illegal outside indefinite length constructed form | |
1068 | */ | |
1069 | if (!inf) { | |
9311d0c4 | 1070 | ERR_raise(ERR_LIB_ASN1, ASN1_R_UNEXPECTED_EOC); |
0f113f3e MC |
1071 | return 0; |
1072 | } | |
1073 | inf = 0; | |
1074 | break; | |
1075 | } | |
1076 | ||
1077 | if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p, | |
1078 | len, tag, aclass, 0, NULL)) { | |
9311d0c4 | 1079 | ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR); |
0f113f3e MC |
1080 | return 0; |
1081 | } | |
1082 | ||
1083 | /* If indefinite length constructed update max length */ | |
1084 | if (cst) { | |
1085 | if (depth >= ASN1_MAX_STRING_NEST) { | |
9311d0c4 | 1086 | ERR_raise(ERR_LIB_ASN1, ASN1_R_NESTED_ASN1_STRING); |
0f113f3e MC |
1087 | return 0; |
1088 | } | |
1089 | if (!asn1_collect(buf, &p, plen, ininf, tag, aclass, depth + 1)) | |
1090 | return 0; | |
1091 | } else if (plen && !collect_data(buf, &p, plen)) | |
1092 | return 0; | |
1093 | len -= p - q; | |
1094 | } | |
1095 | if (inf) { | |
9311d0c4 | 1096 | ERR_raise(ERR_LIB_ASN1, ASN1_R_MISSING_EOC); |
0f113f3e MC |
1097 | return 0; |
1098 | } | |
1099 | *in = p; | |
1100 | return 1; | |
1101 | } | |
9d6b1ce6 | 1102 | |
875a644a | 1103 | static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen) |
0f113f3e MC |
1104 | { |
1105 | int len; | |
1106 | if (buf) { | |
1107 | len = buf->length; | |
1108 | if (!BUF_MEM_grow_clean(buf, len + plen)) { | |
e077455e | 1109 | ERR_raise(ERR_LIB_ASN1, ERR_R_BUF_LIB); |
0f113f3e MC |
1110 | return 0; |
1111 | } | |
1112 | memcpy(buf->data + len, *p, plen); | |
1113 | } | |
1114 | *p += plen; | |
1115 | return 1; | |
1116 | } | |
9d6b1ce6 DSH |
1117 | |
1118 | /* Check for ASN1 EOC and swallow it if found */ | |
1119 | ||
875a644a | 1120 | static int asn1_check_eoc(const unsigned char **in, long len) |
0f113f3e MC |
1121 | { |
1122 | const unsigned char *p; | |
12a765a5 | 1123 | |
0f113f3e MC |
1124 | if (len < 2) |
1125 | return 0; | |
1126 | p = *in; | |
12a765a5 | 1127 | if (p[0] == '\0' && p[1] == '\0') { |
0f113f3e MC |
1128 | *in += 2; |
1129 | return 1; | |
1130 | } | |
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Check an ASN1 tag and length: a bit like ASN1_get_object but it sets the | |
1136 | * length for indefinite length constructed form, we don't know the exact | |
1137 | * length but we can set an upper bound to the amount of data available minus | |
1138 | * the header length just read. | |
9d6b1ce6 DSH |
1139 | */ |
1140 | ||
8845420f | 1141 | static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass, |
0f113f3e MC |
1142 | char *inf, char *cst, |
1143 | const unsigned char **in, long len, | |
1144 | int exptag, int expclass, char opt, ASN1_TLC *ctx) | |
1145 | { | |
1146 | int i; | |
1147 | int ptag, pclass; | |
1148 | long plen; | |
1149 | const unsigned char *p, *q; | |
1150 | p = *in; | |
1151 | q = p; | |
1152 | ||
3e73111d DDO |
1153 | if (len <= 0) { |
1154 | ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL); | |
1155 | goto err; | |
1156 | } | |
db76a35e | 1157 | if (ctx != NULL && ctx->valid) { |
0f113f3e MC |
1158 | i = ctx->ret; |
1159 | plen = ctx->plen; | |
1160 | pclass = ctx->pclass; | |
1161 | ptag = ctx->ptag; | |
1162 | p += ctx->hdrlen; | |
1163 | } else { | |
1164 | i = ASN1_get_object(&p, &plen, &ptag, &pclass, len); | |
db76a35e | 1165 | if (ctx != NULL) { |
0f113f3e MC |
1166 | ctx->ret = i; |
1167 | ctx->plen = plen; | |
1168 | ctx->pclass = pclass; | |
1169 | ctx->ptag = ptag; | |
1170 | ctx->hdrlen = p - q; | |
1171 | ctx->valid = 1; | |
1172 | /* | |
1173 | * If definite length, and no error, length + header can't exceed | |
1174 | * total amount of data available. | |
1175 | */ | |
db76a35e | 1176 | if ((i & 0x81) == 0 && (plen + ctx->hdrlen) > len) { |
9311d0c4 | 1177 | ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG); |
3e73111d | 1178 | goto err; |
0f113f3e MC |
1179 | } |
1180 | } | |
1181 | } | |
1182 | ||
3e73111d DDO |
1183 | if ((i & 0x80) != 0) { |
1184 | ERR_raise(ERR_LIB_ASN1, ASN1_R_BAD_OBJECT_HEADER); | |
db76a35e | 1185 | goto err; |
3e73111d | 1186 | } |
0f113f3e | 1187 | if (exptag >= 0) { |
db76a35e | 1188 | if (exptag != ptag || expclass != pclass) { |
0f113f3e MC |
1189 | /* |
1190 | * If type is OPTIONAL, not an error: indicate missing type. | |
1191 | */ | |
db76a35e | 1192 | if (opt != 0) |
0f113f3e | 1193 | return -1; |
9311d0c4 | 1194 | ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_TAG); |
3e73111d | 1195 | goto err; |
0f113f3e MC |
1196 | } |
1197 | /* | |
1198 | * We have a tag and class match: assume we are going to do something | |
1199 | * with it | |
1200 | */ | |
1201 | asn1_tlc_clear(ctx); | |
1202 | } | |
1203 | ||
db76a35e | 1204 | if ((i & 1) != 0) |
0f113f3e MC |
1205 | plen = len - (p - q); |
1206 | ||
db76a35e | 1207 | if (inf != NULL) |
0f113f3e MC |
1208 | *inf = i & 1; |
1209 | ||
db76a35e | 1210 | if (cst != NULL) |
0f113f3e MC |
1211 | *cst = i & V_ASN1_CONSTRUCTED; |
1212 | ||
db76a35e | 1213 | if (olen != NULL) |
0f113f3e MC |
1214 | *olen = plen; |
1215 | ||
db76a35e | 1216 | if (oclass != NULL) |
0f113f3e MC |
1217 | *oclass = pclass; |
1218 | ||
db76a35e | 1219 | if (otag != NULL) |
0f113f3e MC |
1220 | *otag = ptag; |
1221 | ||
1222 | *in = p; | |
1223 | return 1; | |
db76a35e DDO |
1224 | |
1225 | err: | |
db76a35e DDO |
1226 | asn1_tlc_clear(ctx); |
1227 | return 0; | |
0f113f3e | 1228 | } |