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c26fd69f DH |
1 | /* X.509 certificate parser |
2 | * | |
3 | * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) "X.509: "fmt | |
13 | #include <linux/kernel.h> | |
ace0107a | 14 | #include <linux/export.h> |
c26fd69f DH |
15 | #include <linux/slab.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/oid_registry.h> | |
db6c43bd | 18 | #include <crypto/public_key.h> |
c26fd69f DH |
19 | #include "x509_parser.h" |
20 | #include "x509-asn1.h" | |
b92e6570 | 21 | #include "x509_akid-asn1.h" |
c26fd69f DH |
22 | |
23 | struct x509_parse_context { | |
24 | struct x509_certificate *cert; /* Certificate being constructed */ | |
25 | unsigned long data; /* Start of data */ | |
26 | const void *cert_start; /* Start of cert content */ | |
27 | const void *key; /* Key data */ | |
28 | size_t key_size; /* Size of key data */ | |
29 | enum OID last_oid; /* Last OID encountered */ | |
30 | enum OID algo_oid; /* Algorithm OID */ | |
31 | unsigned char nr_mpi; /* Number of MPIs stored */ | |
32 | u8 o_size; /* Size of organizationName (O) */ | |
33 | u8 cn_size; /* Size of commonName (CN) */ | |
34 | u8 email_size; /* Size of emailAddress */ | |
35 | u16 o_offset; /* Offset of organizationName (O) */ | |
36 | u16 cn_offset; /* Offset of commonName (CN) */ | |
37 | u16 email_offset; /* Offset of emailAddress */ | |
b92e6570 DH |
38 | unsigned raw_akid_size; |
39 | const void *raw_akid; /* Raw authorityKeyId in ASN.1 */ | |
40 | const void *akid_raw_issuer; /* Raw directoryName in authorityKeyId */ | |
41 | unsigned akid_raw_issuer_size; | |
c26fd69f DH |
42 | }; |
43 | ||
44 | /* | |
45 | * Free an X.509 certificate | |
46 | */ | |
47 | void x509_free_certificate(struct x509_certificate *cert) | |
48 | { | |
49 | if (cert) { | |
3b764563 | 50 | public_key_free(cert->pub); |
77d0910d | 51 | public_key_signature_free(cert->sig); |
c26fd69f DH |
52 | kfree(cert->issuer); |
53 | kfree(cert->subject); | |
46963b77 DH |
54 | kfree(cert->id); |
55 | kfree(cert->skid); | |
c26fd69f DH |
56 | kfree(cert); |
57 | } | |
58 | } | |
ace0107a | 59 | EXPORT_SYMBOL_GPL(x509_free_certificate); |
c26fd69f DH |
60 | |
61 | /* | |
62 | * Parse an X.509 certificate | |
63 | */ | |
64 | struct x509_certificate *x509_cert_parse(const void *data, size_t datalen) | |
65 | { | |
66 | struct x509_certificate *cert; | |
67 | struct x509_parse_context *ctx; | |
46963b77 | 68 | struct asymmetric_key_id *kid; |
c26fd69f DH |
69 | long ret; |
70 | ||
71 | ret = -ENOMEM; | |
72 | cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL); | |
73 | if (!cert) | |
74 | goto error_no_cert; | |
75 | cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL); | |
76 | if (!cert->pub) | |
77 | goto error_no_ctx; | |
77d0910d DH |
78 | cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL); |
79 | if (!cert->sig) | |
80 | goto error_no_ctx; | |
c26fd69f DH |
81 | ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL); |
82 | if (!ctx) | |
83 | goto error_no_ctx; | |
84 | ||
85 | ctx->cert = cert; | |
86 | ctx->data = (unsigned long)data; | |
87 | ||
88 | /* Attempt to decode the certificate */ | |
89 | ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen); | |
90 | if (ret < 0) | |
91 | goto error_decode; | |
92 | ||
b92e6570 DH |
93 | /* Decode the AuthorityKeyIdentifier */ |
94 | if (ctx->raw_akid) { | |
95 | pr_devel("AKID: %u %*phN\n", | |
96 | ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid); | |
97 | ret = asn1_ber_decoder(&x509_akid_decoder, ctx, | |
98 | ctx->raw_akid, ctx->raw_akid_size); | |
99 | if (ret < 0) { | |
100 | pr_warn("Couldn't decode AuthKeyIdentifier\n"); | |
101 | goto error_decode; | |
102 | } | |
103 | } | |
104 | ||
4e880168 | 105 | ret = -ENOMEM; |
db6c43bd TS |
106 | cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL); |
107 | if (!cert->pub->key) | |
c26fd69f DH |
108 | goto error_decode; |
109 | ||
db6c43bd TS |
110 | cert->pub->keylen = ctx->key_size; |
111 | ||
6c2dc5ae DH |
112 | /* Grab the signature bits */ |
113 | ret = x509_get_sig_params(cert); | |
114 | if (ret < 0) | |
115 | goto error_decode; | |
116 | ||
46963b77 DH |
117 | /* Generate cert issuer + serial number key ID */ |
118 | kid = asymmetric_key_generate_id(cert->raw_serial, | |
119 | cert->raw_serial_size, | |
120 | cert->raw_issuer, | |
121 | cert->raw_issuer_size); | |
122 | if (IS_ERR(kid)) { | |
123 | ret = PTR_ERR(kid); | |
124 | goto error_decode; | |
125 | } | |
126 | cert->id = kid; | |
127 | ||
6c2dc5ae DH |
128 | /* Detect self-signed certificates */ |
129 | ret = x509_check_for_self_signed(cert); | |
130 | if (ret < 0) | |
131 | goto error_decode; | |
132 | ||
c26fd69f DH |
133 | kfree(ctx); |
134 | return cert; | |
135 | ||
136 | error_decode: | |
137 | kfree(ctx); | |
138 | error_no_ctx: | |
139 | x509_free_certificate(cert); | |
140 | error_no_cert: | |
141 | return ERR_PTR(ret); | |
142 | } | |
ace0107a | 143 | EXPORT_SYMBOL_GPL(x509_cert_parse); |
c26fd69f DH |
144 | |
145 | /* | |
146 | * Note an OID when we find one for later processing when we know how | |
147 | * to interpret it. | |
148 | */ | |
149 | int x509_note_OID(void *context, size_t hdrlen, | |
150 | unsigned char tag, | |
151 | const void *value, size_t vlen) | |
152 | { | |
153 | struct x509_parse_context *ctx = context; | |
154 | ||
155 | ctx->last_oid = look_up_OID(value, vlen); | |
156 | if (ctx->last_oid == OID__NR) { | |
157 | char buffer[50]; | |
158 | sprint_oid(value, vlen, buffer, sizeof(buffer)); | |
cf75446e | 159 | pr_debug("Unknown OID: [%lu] %s\n", |
c26fd69f DH |
160 | (unsigned long)value - ctx->data, buffer); |
161 | } | |
162 | return 0; | |
163 | } | |
164 | ||
165 | /* | |
166 | * Save the position of the TBS data so that we can check the signature over it | |
167 | * later. | |
168 | */ | |
169 | int x509_note_tbs_certificate(void *context, size_t hdrlen, | |
170 | unsigned char tag, | |
171 | const void *value, size_t vlen) | |
172 | { | |
173 | struct x509_parse_context *ctx = context; | |
174 | ||
175 | pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n", | |
176 | hdrlen, tag, (unsigned long)value - ctx->data, vlen); | |
177 | ||
178 | ctx->cert->tbs = value - hdrlen; | |
179 | ctx->cert->tbs_size = vlen + hdrlen; | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
184 | * Record the public key algorithm | |
185 | */ | |
186 | int x509_note_pkey_algo(void *context, size_t hdrlen, | |
187 | unsigned char tag, | |
188 | const void *value, size_t vlen) | |
189 | { | |
190 | struct x509_parse_context *ctx = context; | |
191 | ||
192 | pr_debug("PubKey Algo: %u\n", ctx->last_oid); | |
193 | ||
194 | switch (ctx->last_oid) { | |
195 | case OID_md2WithRSAEncryption: | |
196 | case OID_md3WithRSAEncryption: | |
197 | default: | |
198 | return -ENOPKG; /* Unsupported combination */ | |
199 | ||
200 | case OID_md4WithRSAEncryption: | |
77d0910d DH |
201 | ctx->cert->sig->hash_algo = "md4"; |
202 | ctx->cert->sig->pkey_algo = "rsa"; | |
c26fd69f DH |
203 | break; |
204 | ||
205 | case OID_sha1WithRSAEncryption: | |
77d0910d DH |
206 | ctx->cert->sig->hash_algo = "sha1"; |
207 | ctx->cert->sig->pkey_algo = "rsa"; | |
c26fd69f DH |
208 | break; |
209 | ||
210 | case OID_sha256WithRSAEncryption: | |
77d0910d DH |
211 | ctx->cert->sig->hash_algo = "sha256"; |
212 | ctx->cert->sig->pkey_algo = "rsa"; | |
c26fd69f DH |
213 | break; |
214 | ||
215 | case OID_sha384WithRSAEncryption: | |
77d0910d DH |
216 | ctx->cert->sig->hash_algo = "sha384"; |
217 | ctx->cert->sig->pkey_algo = "rsa"; | |
c26fd69f DH |
218 | break; |
219 | ||
220 | case OID_sha512WithRSAEncryption: | |
77d0910d DH |
221 | ctx->cert->sig->hash_algo = "sha512"; |
222 | ctx->cert->sig->pkey_algo = "rsa"; | |
c26fd69f DH |
223 | break; |
224 | ||
225 | case OID_sha224WithRSAEncryption: | |
77d0910d DH |
226 | ctx->cert->sig->hash_algo = "sha224"; |
227 | ctx->cert->sig->pkey_algo = "rsa"; | |
c26fd69f DH |
228 | break; |
229 | } | |
230 | ||
231 | ctx->algo_oid = ctx->last_oid; | |
232 | return 0; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Note the whereabouts and type of the signature. | |
237 | */ | |
238 | int x509_note_signature(void *context, size_t hdrlen, | |
239 | unsigned char tag, | |
240 | const void *value, size_t vlen) | |
241 | { | |
242 | struct x509_parse_context *ctx = context; | |
243 | ||
244 | pr_debug("Signature type: %u size %zu\n", ctx->last_oid, vlen); | |
245 | ||
246 | if (ctx->last_oid != ctx->algo_oid) { | |
247 | pr_warn("Got cert with pkey (%u) and sig (%u) algorithm OIDs\n", | |
248 | ctx->algo_oid, ctx->last_oid); | |
249 | return -EINVAL; | |
250 | } | |
251 | ||
7056a945 MS |
252 | if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0) { |
253 | /* Discard the BIT STRING metadata */ | |
254 | if (vlen < 1 || *(const u8 *)value != 0) | |
255 | return -EBADMSG; | |
256 | ||
257 | value++; | |
258 | vlen--; | |
259 | } | |
260 | ||
b426beb6 DH |
261 | ctx->cert->raw_sig = value; |
262 | ctx->cert->raw_sig_size = vlen; | |
c26fd69f DH |
263 | return 0; |
264 | } | |
265 | ||
84aabd46 DH |
266 | /* |
267 | * Note the certificate serial number | |
268 | */ | |
269 | int x509_note_serial(void *context, size_t hdrlen, | |
270 | unsigned char tag, | |
271 | const void *value, size_t vlen) | |
272 | { | |
273 | struct x509_parse_context *ctx = context; | |
274 | ctx->cert->raw_serial = value; | |
275 | ctx->cert->raw_serial_size = vlen; | |
276 | return 0; | |
277 | } | |
278 | ||
c26fd69f DH |
279 | /* |
280 | * Note some of the name segments from which we'll fabricate a name. | |
281 | */ | |
282 | int x509_extract_name_segment(void *context, size_t hdrlen, | |
283 | unsigned char tag, | |
284 | const void *value, size_t vlen) | |
285 | { | |
286 | struct x509_parse_context *ctx = context; | |
287 | ||
288 | switch (ctx->last_oid) { | |
289 | case OID_commonName: | |
290 | ctx->cn_size = vlen; | |
291 | ctx->cn_offset = (unsigned long)value - ctx->data; | |
292 | break; | |
293 | case OID_organizationName: | |
294 | ctx->o_size = vlen; | |
295 | ctx->o_offset = (unsigned long)value - ctx->data; | |
296 | break; | |
297 | case OID_email_address: | |
298 | ctx->email_size = vlen; | |
299 | ctx->email_offset = (unsigned long)value - ctx->data; | |
300 | break; | |
301 | default: | |
302 | break; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Fabricate and save the issuer and subject names | |
310 | */ | |
311 | static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen, | |
312 | unsigned char tag, | |
313 | char **_name, size_t vlen) | |
314 | { | |
315 | const void *name, *data = (const void *)ctx->data; | |
316 | size_t namesize; | |
317 | char *buffer; | |
318 | ||
319 | if (*_name) | |
320 | return -EINVAL; | |
321 | ||
322 | /* Empty name string if no material */ | |
323 | if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) { | |
324 | buffer = kmalloc(1, GFP_KERNEL); | |
325 | if (!buffer) | |
326 | return -ENOMEM; | |
327 | buffer[0] = 0; | |
328 | goto done; | |
329 | } | |
330 | ||
331 | if (ctx->cn_size && ctx->o_size) { | |
332 | /* Consider combining O and CN, but use only the CN if it is | |
333 | * prefixed by the O, or a significant portion thereof. | |
334 | */ | |
335 | namesize = ctx->cn_size; | |
336 | name = data + ctx->cn_offset; | |
337 | if (ctx->cn_size >= ctx->o_size && | |
338 | memcmp(data + ctx->cn_offset, data + ctx->o_offset, | |
339 | ctx->o_size) == 0) | |
340 | goto single_component; | |
341 | if (ctx->cn_size >= 7 && | |
342 | ctx->o_size >= 7 && | |
343 | memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0) | |
344 | goto single_component; | |
345 | ||
346 | buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1, | |
347 | GFP_KERNEL); | |
348 | if (!buffer) | |
349 | return -ENOMEM; | |
350 | ||
351 | memcpy(buffer, | |
352 | data + ctx->o_offset, ctx->o_size); | |
353 | buffer[ctx->o_size + 0] = ':'; | |
354 | buffer[ctx->o_size + 1] = ' '; | |
355 | memcpy(buffer + ctx->o_size + 2, | |
356 | data + ctx->cn_offset, ctx->cn_size); | |
357 | buffer[ctx->o_size + 2 + ctx->cn_size] = 0; | |
358 | goto done; | |
359 | ||
360 | } else if (ctx->cn_size) { | |
361 | namesize = ctx->cn_size; | |
362 | name = data + ctx->cn_offset; | |
363 | } else if (ctx->o_size) { | |
364 | namesize = ctx->o_size; | |
365 | name = data + ctx->o_offset; | |
366 | } else { | |
367 | namesize = ctx->email_size; | |
368 | name = data + ctx->email_offset; | |
369 | } | |
370 | ||
371 | single_component: | |
372 | buffer = kmalloc(namesize + 1, GFP_KERNEL); | |
373 | if (!buffer) | |
374 | return -ENOMEM; | |
375 | memcpy(buffer, name, namesize); | |
376 | buffer[namesize] = 0; | |
377 | ||
378 | done: | |
379 | *_name = buffer; | |
380 | ctx->cn_size = 0; | |
381 | ctx->o_size = 0; | |
382 | ctx->email_size = 0; | |
383 | return 0; | |
384 | } | |
385 | ||
386 | int x509_note_issuer(void *context, size_t hdrlen, | |
387 | unsigned char tag, | |
388 | const void *value, size_t vlen) | |
389 | { | |
390 | struct x509_parse_context *ctx = context; | |
84aabd46 DH |
391 | ctx->cert->raw_issuer = value; |
392 | ctx->cert->raw_issuer_size = vlen; | |
c26fd69f DH |
393 | return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen); |
394 | } | |
395 | ||
396 | int x509_note_subject(void *context, size_t hdrlen, | |
397 | unsigned char tag, | |
398 | const void *value, size_t vlen) | |
399 | { | |
400 | struct x509_parse_context *ctx = context; | |
84aabd46 DH |
401 | ctx->cert->raw_subject = value; |
402 | ctx->cert->raw_subject_size = vlen; | |
c26fd69f DH |
403 | return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen); |
404 | } | |
405 | ||
406 | /* | |
407 | * Extract the data for the public key algorithm | |
408 | */ | |
409 | int x509_extract_key_data(void *context, size_t hdrlen, | |
410 | unsigned char tag, | |
411 | const void *value, size_t vlen) | |
412 | { | |
413 | struct x509_parse_context *ctx = context; | |
414 | ||
415 | if (ctx->last_oid != OID_rsaEncryption) | |
416 | return -ENOPKG; | |
417 | ||
4e8ae72a | 418 | ctx->cert->pub->pkey_algo = "rsa"; |
67f7d60b DH |
419 | |
420 | /* Discard the BIT STRING metadata */ | |
0f30cbea EB |
421 | if (vlen < 1 || *(const u8 *)value != 0) |
422 | return -EBADMSG; | |
c26fd69f DH |
423 | ctx->key = value + 1; |
424 | ctx->key_size = vlen - 1; | |
425 | return 0; | |
426 | } | |
427 | ||
04b00bdb CYL |
428 | /* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */ |
429 | #define SEQ_TAG_KEYID (ASN1_CONT << 6) | |
430 | ||
c26fd69f DH |
431 | /* |
432 | * Process certificate extensions that are used to qualify the certificate. | |
433 | */ | |
434 | int x509_process_extension(void *context, size_t hdrlen, | |
435 | unsigned char tag, | |
436 | const void *value, size_t vlen) | |
437 | { | |
438 | struct x509_parse_context *ctx = context; | |
46963b77 | 439 | struct asymmetric_key_id *kid; |
c26fd69f | 440 | const unsigned char *v = value; |
c26fd69f DH |
441 | |
442 | pr_debug("Extension: %u\n", ctx->last_oid); | |
443 | ||
444 | if (ctx->last_oid == OID_subjectKeyIdentifier) { | |
445 | /* Get hold of the key fingerprint */ | |
46963b77 | 446 | if (ctx->cert->skid || vlen < 3) |
c26fd69f DH |
447 | return -EBADMSG; |
448 | if (v[0] != ASN1_OTS || v[1] != vlen - 2) | |
449 | return -EBADMSG; | |
450 | v += 2; | |
451 | vlen -= 2; | |
452 | ||
dd2f6c44 DH |
453 | ctx->cert->raw_skid_size = vlen; |
454 | ctx->cert->raw_skid = v; | |
a4c6e57f | 455 | kid = asymmetric_key_generate_id(v, vlen, "", 0); |
46963b77 DH |
456 | if (IS_ERR(kid)) |
457 | return PTR_ERR(kid); | |
458 | ctx->cert->skid = kid; | |
459 | pr_debug("subjkeyid %*phN\n", kid->len, kid->data); | |
c26fd69f DH |
460 | return 0; |
461 | } | |
462 | ||
463 | if (ctx->last_oid == OID_authorityKeyIdentifier) { | |
464 | /* Get hold of the CA key fingerprint */ | |
b92e6570 DH |
465 | ctx->raw_akid = v; |
466 | ctx->raw_akid_size = vlen; | |
c26fd69f DH |
467 | return 0; |
468 | } | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
fd19a3d1 DH |
473 | /** |
474 | * x509_decode_time - Decode an X.509 time ASN.1 object | |
475 | * @_t: The time to fill in | |
476 | * @hdrlen: The length of the object header | |
477 | * @tag: The object tag | |
478 | * @value: The object value | |
479 | * @vlen: The size of the object value | |
480 | * | |
481 | * Decode an ASN.1 universal time or generalised time field into a struct the | |
482 | * kernel can handle and check it for validity. The time is decoded thus: | |
483 | * | |
484 | * [RFC5280 ยง4.1.2.5] | |
485 | * CAs conforming to this profile MUST always encode certificate validity | |
486 | * dates through the year 2049 as UTCTime; certificate validity dates in | |
487 | * 2050 or later MUST be encoded as GeneralizedTime. Conforming | |
488 | * applications MUST be able to process validity dates that are encoded in | |
489 | * either UTCTime or GeneralizedTime. | |
c26fd69f | 490 | */ |
fd19a3d1 DH |
491 | int x509_decode_time(time64_t *_t, size_t hdrlen, |
492 | unsigned char tag, | |
493 | const unsigned char *value, size_t vlen) | |
c26fd69f | 494 | { |
ac4cbedf | 495 | static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30, |
fd19a3d1 | 496 | 31, 31, 30, 31, 30, 31 }; |
c26fd69f | 497 | const unsigned char *p = value; |
fd19a3d1 | 498 | unsigned year, mon, day, hour, min, sec, mon_len; |
c26fd69f | 499 | |
fd19a3d1 | 500 | #define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; }) |
c26fd69f DH |
501 | #define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; }) |
502 | ||
503 | if (tag == ASN1_UNITIM) { | |
504 | /* UTCTime: YYMMDDHHMMSSZ */ | |
505 | if (vlen != 13) | |
506 | goto unsupported_time; | |
fd19a3d1 DH |
507 | year = DD2bin(p); |
508 | if (year >= 50) | |
509 | year += 1900; | |
c26fd69f | 510 | else |
fd19a3d1 | 511 | year += 2000; |
c26fd69f DH |
512 | } else if (tag == ASN1_GENTIM) { |
513 | /* GenTime: YYYYMMDDHHMMSSZ */ | |
514 | if (vlen != 15) | |
515 | goto unsupported_time; | |
fd19a3d1 DH |
516 | year = DD2bin(p) * 100 + DD2bin(p); |
517 | if (year >= 1950 && year <= 2049) | |
518 | goto invalid_time; | |
c26fd69f DH |
519 | } else { |
520 | goto unsupported_time; | |
521 | } | |
522 | ||
fd19a3d1 DH |
523 | mon = DD2bin(p); |
524 | day = DD2bin(p); | |
525 | hour = DD2bin(p); | |
526 | min = DD2bin(p); | |
527 | sec = DD2bin(p); | |
c26fd69f DH |
528 | |
529 | if (*p != 'Z') | |
530 | goto unsupported_time; | |
531 | ||
cc25b994 DH |
532 | if (year < 1970 || |
533 | mon < 1 || mon > 12) | |
534 | goto invalid_time; | |
535 | ||
536 | mon_len = month_lengths[mon - 1]; | |
fd19a3d1 DH |
537 | if (mon == 2) { |
538 | if (year % 4 == 0) { | |
539 | mon_len = 29; | |
540 | if (year % 100 == 0) { | |
ac4cbedf DH |
541 | mon_len = 28; |
542 | if (year % 400 == 0) | |
543 | mon_len = 29; | |
fd19a3d1 DH |
544 | } |
545 | } | |
546 | } | |
547 | ||
cc25b994 | 548 | if (day < 1 || day > mon_len || |
7650cb80 | 549 | hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */ |
4dd17c9c | 550 | min > 59 || |
da02559c | 551 | sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */ |
fd19a3d1 | 552 | goto invalid_time; |
cc25b994 | 553 | |
fd19a3d1 | 554 | *_t = mktime64(year, mon, day, hour, min, sec); |
c26fd69f DH |
555 | return 0; |
556 | ||
557 | unsupported_time: | |
fd19a3d1 DH |
558 | pr_debug("Got unsupported time [tag %02x]: '%*phN'\n", |
559 | tag, (int)vlen, value); | |
560 | return -EBADMSG; | |
561 | invalid_time: | |
562 | pr_debug("Got invalid time [tag %02x]: '%*phN'\n", | |
563 | tag, (int)vlen, value); | |
c26fd69f DH |
564 | return -EBADMSG; |
565 | } | |
fd19a3d1 | 566 | EXPORT_SYMBOL_GPL(x509_decode_time); |
c26fd69f DH |
567 | |
568 | int x509_note_not_before(void *context, size_t hdrlen, | |
569 | unsigned char tag, | |
570 | const void *value, size_t vlen) | |
571 | { | |
572 | struct x509_parse_context *ctx = context; | |
fd19a3d1 | 573 | return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen); |
c26fd69f DH |
574 | } |
575 | ||
576 | int x509_note_not_after(void *context, size_t hdrlen, | |
577 | unsigned char tag, | |
578 | const void *value, size_t vlen) | |
579 | { | |
580 | struct x509_parse_context *ctx = context; | |
fd19a3d1 | 581 | return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen); |
c26fd69f | 582 | } |
b92e6570 DH |
583 | |
584 | /* | |
585 | * Note a key identifier-based AuthorityKeyIdentifier | |
586 | */ | |
587 | int x509_akid_note_kid(void *context, size_t hdrlen, | |
588 | unsigned char tag, | |
589 | const void *value, size_t vlen) | |
590 | { | |
591 | struct x509_parse_context *ctx = context; | |
592 | struct asymmetric_key_id *kid; | |
593 | ||
594 | pr_debug("AKID: keyid: %*phN\n", (int)vlen, value); | |
595 | ||
77d0910d | 596 | if (ctx->cert->sig->auth_ids[1]) |
b92e6570 DH |
597 | return 0; |
598 | ||
a4c6e57f | 599 | kid = asymmetric_key_generate_id(value, vlen, "", 0); |
b92e6570 DH |
600 | if (IS_ERR(kid)) |
601 | return PTR_ERR(kid); | |
602 | pr_debug("authkeyid %*phN\n", kid->len, kid->data); | |
77d0910d | 603 | ctx->cert->sig->auth_ids[1] = kid; |
b92e6570 DH |
604 | return 0; |
605 | } | |
606 | ||
607 | /* | |
608 | * Note a directoryName in an AuthorityKeyIdentifier | |
609 | */ | |
610 | int x509_akid_note_name(void *context, size_t hdrlen, | |
611 | unsigned char tag, | |
612 | const void *value, size_t vlen) | |
613 | { | |
614 | struct x509_parse_context *ctx = context; | |
615 | ||
616 | pr_debug("AKID: name: %*phN\n", (int)vlen, value); | |
617 | ||
618 | ctx->akid_raw_issuer = value; | |
619 | ctx->akid_raw_issuer_size = vlen; | |
620 | return 0; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Note a serial number in an AuthorityKeyIdentifier | |
625 | */ | |
626 | int x509_akid_note_serial(void *context, size_t hdrlen, | |
627 | unsigned char tag, | |
628 | const void *value, size_t vlen) | |
629 | { | |
630 | struct x509_parse_context *ctx = context; | |
631 | struct asymmetric_key_id *kid; | |
632 | ||
633 | pr_debug("AKID: serial: %*phN\n", (int)vlen, value); | |
634 | ||
77d0910d | 635 | if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0]) |
b92e6570 DH |
636 | return 0; |
637 | ||
638 | kid = asymmetric_key_generate_id(value, | |
639 | vlen, | |
640 | ctx->akid_raw_issuer, | |
641 | ctx->akid_raw_issuer_size); | |
642 | if (IS_ERR(kid)) | |
643 | return PTR_ERR(kid); | |
644 | ||
645 | pr_debug("authkeyid %*phN\n", kid->len, kid->data); | |
77d0910d | 646 | ctx->cert->sig->auth_ids[0] = kid; |
b92e6570 DH |
647 | return 0; |
648 | } |