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b4d0d230 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c26fd69f DH |
2 | /* X.509 certificate parser |
3 | * | |
4 | * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
c26fd69f DH |
6 | */ |
7 | ||
8 | #define pr_fmt(fmt) "X.509: "fmt | |
9 | #include <linux/kernel.h> | |
ace0107a | 10 | #include <linux/export.h> |
c26fd69f DH |
11 | #include <linux/slab.h> |
12 | #include <linux/err.h> | |
13 | #include <linux/oid_registry.h> | |
db6c43bd | 14 | #include <crypto/public_key.h> |
c26fd69f | 15 | #include "x509_parser.h" |
4fa8bc94 MY |
16 | #include "x509.asn1.h" |
17 | #include "x509_akid.asn1.h" | |
c26fd69f DH |
18 | |
19 | struct x509_parse_context { | |
20 | struct x509_certificate *cert; /* Certificate being constructed */ | |
21 | unsigned long data; /* Start of data */ | |
22 | const void *cert_start; /* Start of cert content */ | |
23 | const void *key; /* Key data */ | |
24 | size_t key_size; /* Size of key data */ | |
f1774cb8 VC |
25 | const void *params; /* Key parameters */ |
26 | size_t params_size; /* Size of key parameters */ | |
27 | enum OID key_algo; /* Public key algorithm */ | |
c26fd69f DH |
28 | enum OID last_oid; /* Last OID encountered */ |
29 | enum OID algo_oid; /* Algorithm OID */ | |
30 | unsigned char nr_mpi; /* Number of MPIs stored */ | |
31 | u8 o_size; /* Size of organizationName (O) */ | |
32 | u8 cn_size; /* Size of commonName (CN) */ | |
33 | u8 email_size; /* Size of emailAddress */ | |
34 | u16 o_offset; /* Offset of organizationName (O) */ | |
35 | u16 cn_offset; /* Offset of commonName (CN) */ | |
36 | u16 email_offset; /* Offset of emailAddress */ | |
b92e6570 DH |
37 | unsigned raw_akid_size; |
38 | const void *raw_akid; /* Raw authorityKeyId in ASN.1 */ | |
39 | const void *akid_raw_issuer; /* Raw directoryName in authorityKeyId */ | |
40 | unsigned akid_raw_issuer_size; | |
c26fd69f DH |
41 | }; |
42 | ||
43 | /* | |
44 | * Free an X.509 certificate | |
45 | */ | |
46 | void x509_free_certificate(struct x509_certificate *cert) | |
47 | { | |
48 | if (cert) { | |
3b764563 | 49 | public_key_free(cert->pub); |
77d0910d | 50 | public_key_signature_free(cert->sig); |
c26fd69f DH |
51 | kfree(cert->issuer); |
52 | kfree(cert->subject); | |
46963b77 DH |
53 | kfree(cert->id); |
54 | kfree(cert->skid); | |
c26fd69f DH |
55 | kfree(cert); |
56 | } | |
57 | } | |
ace0107a | 58 | EXPORT_SYMBOL_GPL(x509_free_certificate); |
c26fd69f DH |
59 | |
60 | /* | |
61 | * Parse an X.509 certificate | |
62 | */ | |
63 | struct x509_certificate *x509_cert_parse(const void *data, size_t datalen) | |
64 | { | |
65 | struct x509_certificate *cert; | |
66 | struct x509_parse_context *ctx; | |
46963b77 | 67 | struct asymmetric_key_id *kid; |
c26fd69f DH |
68 | long ret; |
69 | ||
70 | ret = -ENOMEM; | |
71 | cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL); | |
72 | if (!cert) | |
73 | goto error_no_cert; | |
74 | cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL); | |
75 | if (!cert->pub) | |
76 | goto error_no_ctx; | |
77d0910d DH |
77 | cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL); |
78 | if (!cert->sig) | |
79 | goto error_no_ctx; | |
c26fd69f DH |
80 | ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL); |
81 | if (!ctx) | |
82 | goto error_no_ctx; | |
83 | ||
84 | ctx->cert = cert; | |
85 | ctx->data = (unsigned long)data; | |
86 | ||
87 | /* Attempt to decode the certificate */ | |
88 | ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen); | |
89 | if (ret < 0) | |
90 | goto error_decode; | |
91 | ||
b92e6570 DH |
92 | /* Decode the AuthorityKeyIdentifier */ |
93 | if (ctx->raw_akid) { | |
94 | pr_devel("AKID: %u %*phN\n", | |
95 | ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid); | |
96 | ret = asn1_ber_decoder(&x509_akid_decoder, ctx, | |
97 | ctx->raw_akid, ctx->raw_akid_size); | |
98 | if (ret < 0) { | |
99 | pr_warn("Couldn't decode AuthKeyIdentifier\n"); | |
100 | goto error_decode; | |
101 | } | |
102 | } | |
103 | ||
4e880168 | 104 | ret = -ENOMEM; |
db6c43bd TS |
105 | cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL); |
106 | if (!cert->pub->key) | |
c26fd69f DH |
107 | goto error_decode; |
108 | ||
db6c43bd TS |
109 | cert->pub->keylen = ctx->key_size; |
110 | ||
f1774cb8 VC |
111 | cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL); |
112 | if (!cert->pub->params) | |
113 | goto error_decode; | |
114 | ||
115 | cert->pub->paramlen = ctx->params_size; | |
116 | cert->pub->algo = ctx->key_algo; | |
117 | ||
6c2dc5ae DH |
118 | /* Grab the signature bits */ |
119 | ret = x509_get_sig_params(cert); | |
120 | if (ret < 0) | |
121 | goto error_decode; | |
122 | ||
46963b77 DH |
123 | /* Generate cert issuer + serial number key ID */ |
124 | kid = asymmetric_key_generate_id(cert->raw_serial, | |
125 | cert->raw_serial_size, | |
126 | cert->raw_issuer, | |
127 | cert->raw_issuer_size); | |
128 | if (IS_ERR(kid)) { | |
129 | ret = PTR_ERR(kid); | |
130 | goto error_decode; | |
131 | } | |
132 | cert->id = kid; | |
133 | ||
6c2dc5ae DH |
134 | /* Detect self-signed certificates */ |
135 | ret = x509_check_for_self_signed(cert); | |
136 | if (ret < 0) | |
137 | goto error_decode; | |
138 | ||
c26fd69f DH |
139 | kfree(ctx); |
140 | return cert; | |
141 | ||
142 | error_decode: | |
143 | kfree(ctx); | |
144 | error_no_ctx: | |
145 | x509_free_certificate(cert); | |
146 | error_no_cert: | |
147 | return ERR_PTR(ret); | |
148 | } | |
ace0107a | 149 | EXPORT_SYMBOL_GPL(x509_cert_parse); |
c26fd69f DH |
150 | |
151 | /* | |
152 | * Note an OID when we find one for later processing when we know how | |
153 | * to interpret it. | |
154 | */ | |
155 | int x509_note_OID(void *context, size_t hdrlen, | |
156 | unsigned char tag, | |
157 | const void *value, size_t vlen) | |
158 | { | |
159 | struct x509_parse_context *ctx = context; | |
160 | ||
161 | ctx->last_oid = look_up_OID(value, vlen); | |
162 | if (ctx->last_oid == OID__NR) { | |
163 | char buffer[50]; | |
164 | sprint_oid(value, vlen, buffer, sizeof(buffer)); | |
cf75446e | 165 | pr_debug("Unknown OID: [%lu] %s\n", |
c26fd69f DH |
166 | (unsigned long)value - ctx->data, buffer); |
167 | } | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /* | |
172 | * Save the position of the TBS data so that we can check the signature over it | |
173 | * later. | |
174 | */ | |
175 | int x509_note_tbs_certificate(void *context, size_t hdrlen, | |
176 | unsigned char tag, | |
177 | const void *value, size_t vlen) | |
178 | { | |
179 | struct x509_parse_context *ctx = context; | |
180 | ||
181 | pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n", | |
182 | hdrlen, tag, (unsigned long)value - ctx->data, vlen); | |
183 | ||
184 | ctx->cert->tbs = value - hdrlen; | |
185 | ctx->cert->tbs_size = vlen + hdrlen; | |
186 | return 0; | |
187 | } | |
188 | ||
189 | /* | |
190 | * Record the public key algorithm | |
191 | */ | |
192 | int x509_note_pkey_algo(void *context, size_t hdrlen, | |
193 | unsigned char tag, | |
194 | const void *value, size_t vlen) | |
195 | { | |
196 | struct x509_parse_context *ctx = context; | |
197 | ||
198 | pr_debug("PubKey Algo: %u\n", ctx->last_oid); | |
199 | ||
200 | switch (ctx->last_oid) { | |
201 | case OID_md2WithRSAEncryption: | |
202 | case OID_md3WithRSAEncryption: | |
203 | default: | |
204 | return -ENOPKG; /* Unsupported combination */ | |
205 | ||
206 | case OID_md4WithRSAEncryption: | |
77d0910d | 207 | ctx->cert->sig->hash_algo = "md4"; |
03988490 | 208 | goto rsa_pkcs1; |
c26fd69f DH |
209 | |
210 | case OID_sha1WithRSAEncryption: | |
77d0910d | 211 | ctx->cert->sig->hash_algo = "sha1"; |
03988490 | 212 | goto rsa_pkcs1; |
c26fd69f DH |
213 | |
214 | case OID_sha256WithRSAEncryption: | |
77d0910d | 215 | ctx->cert->sig->hash_algo = "sha256"; |
03988490 | 216 | goto rsa_pkcs1; |
c26fd69f DH |
217 | |
218 | case OID_sha384WithRSAEncryption: | |
77d0910d | 219 | ctx->cert->sig->hash_algo = "sha384"; |
03988490 | 220 | goto rsa_pkcs1; |
c26fd69f DH |
221 | |
222 | case OID_sha512WithRSAEncryption: | |
77d0910d | 223 | ctx->cert->sig->hash_algo = "sha512"; |
03988490 | 224 | goto rsa_pkcs1; |
c26fd69f DH |
225 | |
226 | case OID_sha224WithRSAEncryption: | |
77d0910d | 227 | ctx->cert->sig->hash_algo = "sha224"; |
03988490 | 228 | goto rsa_pkcs1; |
0d7a7864 VC |
229 | |
230 | case OID_gost2012Signature256: | |
231 | ctx->cert->sig->hash_algo = "streebog256"; | |
232 | goto ecrdsa; | |
233 | ||
234 | case OID_gost2012Signature512: | |
235 | ctx->cert->sig->hash_algo = "streebog512"; | |
236 | goto ecrdsa; | |
c26fd69f DH |
237 | } |
238 | ||
03988490 DH |
239 | rsa_pkcs1: |
240 | ctx->cert->sig->pkey_algo = "rsa"; | |
241 | ctx->cert->sig->encoding = "pkcs1"; | |
c26fd69f DH |
242 | ctx->algo_oid = ctx->last_oid; |
243 | return 0; | |
0d7a7864 VC |
244 | ecrdsa: |
245 | ctx->cert->sig->pkey_algo = "ecrdsa"; | |
246 | ctx->cert->sig->encoding = "raw"; | |
247 | ctx->algo_oid = ctx->last_oid; | |
248 | return 0; | |
c26fd69f DH |
249 | } |
250 | ||
251 | /* | |
252 | * Note the whereabouts and type of the signature. | |
253 | */ | |
254 | int x509_note_signature(void *context, size_t hdrlen, | |
255 | unsigned char tag, | |
256 | const void *value, size_t vlen) | |
257 | { | |
258 | struct x509_parse_context *ctx = context; | |
259 | ||
260 | pr_debug("Signature type: %u size %zu\n", ctx->last_oid, vlen); | |
261 | ||
262 | if (ctx->last_oid != ctx->algo_oid) { | |
263 | pr_warn("Got cert with pkey (%u) and sig (%u) algorithm OIDs\n", | |
264 | ctx->algo_oid, ctx->last_oid); | |
265 | return -EINVAL; | |
266 | } | |
267 | ||
0d7a7864 VC |
268 | if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 || |
269 | strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0) { | |
b65c32ec MS |
270 | /* Discard the BIT STRING metadata */ |
271 | if (vlen < 1 || *(const u8 *)value != 0) | |
272 | return -EBADMSG; | |
273 | ||
274 | value++; | |
275 | vlen--; | |
276 | } | |
277 | ||
b426beb6 DH |
278 | ctx->cert->raw_sig = value; |
279 | ctx->cert->raw_sig_size = vlen; | |
c26fd69f DH |
280 | return 0; |
281 | } | |
282 | ||
84aabd46 DH |
283 | /* |
284 | * Note the certificate serial number | |
285 | */ | |
286 | int x509_note_serial(void *context, size_t hdrlen, | |
287 | unsigned char tag, | |
288 | const void *value, size_t vlen) | |
289 | { | |
290 | struct x509_parse_context *ctx = context; | |
291 | ctx->cert->raw_serial = value; | |
292 | ctx->cert->raw_serial_size = vlen; | |
293 | return 0; | |
294 | } | |
295 | ||
c26fd69f DH |
296 | /* |
297 | * Note some of the name segments from which we'll fabricate a name. | |
298 | */ | |
299 | int x509_extract_name_segment(void *context, size_t hdrlen, | |
300 | unsigned char tag, | |
301 | const void *value, size_t vlen) | |
302 | { | |
303 | struct x509_parse_context *ctx = context; | |
304 | ||
305 | switch (ctx->last_oid) { | |
306 | case OID_commonName: | |
307 | ctx->cn_size = vlen; | |
308 | ctx->cn_offset = (unsigned long)value - ctx->data; | |
309 | break; | |
310 | case OID_organizationName: | |
311 | ctx->o_size = vlen; | |
312 | ctx->o_offset = (unsigned long)value - ctx->data; | |
313 | break; | |
314 | case OID_email_address: | |
315 | ctx->email_size = vlen; | |
316 | ctx->email_offset = (unsigned long)value - ctx->data; | |
317 | break; | |
318 | default: | |
319 | break; | |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Fabricate and save the issuer and subject names | |
327 | */ | |
328 | static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen, | |
329 | unsigned char tag, | |
330 | char **_name, size_t vlen) | |
331 | { | |
332 | const void *name, *data = (const void *)ctx->data; | |
333 | size_t namesize; | |
334 | char *buffer; | |
335 | ||
336 | if (*_name) | |
337 | return -EINVAL; | |
338 | ||
339 | /* Empty name string if no material */ | |
340 | if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) { | |
341 | buffer = kmalloc(1, GFP_KERNEL); | |
342 | if (!buffer) | |
343 | return -ENOMEM; | |
344 | buffer[0] = 0; | |
345 | goto done; | |
346 | } | |
347 | ||
348 | if (ctx->cn_size && ctx->o_size) { | |
349 | /* Consider combining O and CN, but use only the CN if it is | |
350 | * prefixed by the O, or a significant portion thereof. | |
351 | */ | |
352 | namesize = ctx->cn_size; | |
353 | name = data + ctx->cn_offset; | |
354 | if (ctx->cn_size >= ctx->o_size && | |
355 | memcmp(data + ctx->cn_offset, data + ctx->o_offset, | |
356 | ctx->o_size) == 0) | |
357 | goto single_component; | |
358 | if (ctx->cn_size >= 7 && | |
359 | ctx->o_size >= 7 && | |
360 | memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0) | |
361 | goto single_component; | |
362 | ||
363 | buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1, | |
364 | GFP_KERNEL); | |
365 | if (!buffer) | |
366 | return -ENOMEM; | |
367 | ||
368 | memcpy(buffer, | |
369 | data + ctx->o_offset, ctx->o_size); | |
370 | buffer[ctx->o_size + 0] = ':'; | |
371 | buffer[ctx->o_size + 1] = ' '; | |
372 | memcpy(buffer + ctx->o_size + 2, | |
373 | data + ctx->cn_offset, ctx->cn_size); | |
374 | buffer[ctx->o_size + 2 + ctx->cn_size] = 0; | |
375 | goto done; | |
376 | ||
377 | } else if (ctx->cn_size) { | |
378 | namesize = ctx->cn_size; | |
379 | name = data + ctx->cn_offset; | |
380 | } else if (ctx->o_size) { | |
381 | namesize = ctx->o_size; | |
382 | name = data + ctx->o_offset; | |
383 | } else { | |
384 | namesize = ctx->email_size; | |
385 | name = data + ctx->email_offset; | |
386 | } | |
387 | ||
388 | single_component: | |
389 | buffer = kmalloc(namesize + 1, GFP_KERNEL); | |
390 | if (!buffer) | |
391 | return -ENOMEM; | |
392 | memcpy(buffer, name, namesize); | |
393 | buffer[namesize] = 0; | |
394 | ||
395 | done: | |
396 | *_name = buffer; | |
397 | ctx->cn_size = 0; | |
398 | ctx->o_size = 0; | |
399 | ctx->email_size = 0; | |
400 | return 0; | |
401 | } | |
402 | ||
403 | int x509_note_issuer(void *context, size_t hdrlen, | |
404 | unsigned char tag, | |
405 | const void *value, size_t vlen) | |
406 | { | |
407 | struct x509_parse_context *ctx = context; | |
84aabd46 DH |
408 | ctx->cert->raw_issuer = value; |
409 | ctx->cert->raw_issuer_size = vlen; | |
c26fd69f DH |
410 | return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen); |
411 | } | |
412 | ||
413 | int x509_note_subject(void *context, size_t hdrlen, | |
414 | unsigned char tag, | |
415 | const void *value, size_t vlen) | |
416 | { | |
417 | struct x509_parse_context *ctx = context; | |
84aabd46 DH |
418 | ctx->cert->raw_subject = value; |
419 | ctx->cert->raw_subject_size = vlen; | |
c26fd69f DH |
420 | return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen); |
421 | } | |
422 | ||
f1774cb8 VC |
423 | /* |
424 | * Extract the parameters for the public key | |
425 | */ | |
426 | int x509_note_params(void *context, size_t hdrlen, | |
427 | unsigned char tag, | |
428 | const void *value, size_t vlen) | |
429 | { | |
430 | struct x509_parse_context *ctx = context; | |
431 | ||
432 | /* | |
433 | * AlgorithmIdentifier is used three times in the x509, we should skip | |
434 | * first and ignore third, using second one which is after subject and | |
435 | * before subjectPublicKey. | |
436 | */ | |
437 | if (!ctx->cert->raw_subject || ctx->key) | |
438 | return 0; | |
439 | ctx->params = value - hdrlen; | |
440 | ctx->params_size = vlen + hdrlen; | |
441 | return 0; | |
442 | } | |
443 | ||
c26fd69f DH |
444 | /* |
445 | * Extract the data for the public key algorithm | |
446 | */ | |
447 | int x509_extract_key_data(void *context, size_t hdrlen, | |
448 | unsigned char tag, | |
449 | const void *value, size_t vlen) | |
450 | { | |
451 | struct x509_parse_context *ctx = context; | |
452 | ||
0d7a7864 VC |
453 | ctx->key_algo = ctx->last_oid; |
454 | if (ctx->last_oid == OID_rsaEncryption) | |
455 | ctx->cert->pub->pkey_algo = "rsa"; | |
456 | else if (ctx->last_oid == OID_gost2012PKey256 || | |
457 | ctx->last_oid == OID_gost2012PKey512) | |
458 | ctx->cert->pub->pkey_algo = "ecrdsa"; | |
459 | else | |
c26fd69f DH |
460 | return -ENOPKG; |
461 | ||
67f7d60b | 462 | /* Discard the BIT STRING metadata */ |
0f30cbea EB |
463 | if (vlen < 1 || *(const u8 *)value != 0) |
464 | return -EBADMSG; | |
c26fd69f DH |
465 | ctx->key = value + 1; |
466 | ctx->key_size = vlen - 1; | |
467 | return 0; | |
468 | } | |
469 | ||
04b00bdb CYL |
470 | /* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */ |
471 | #define SEQ_TAG_KEYID (ASN1_CONT << 6) | |
472 | ||
c26fd69f DH |
473 | /* |
474 | * Process certificate extensions that are used to qualify the certificate. | |
475 | */ | |
476 | int x509_process_extension(void *context, size_t hdrlen, | |
477 | unsigned char tag, | |
478 | const void *value, size_t vlen) | |
479 | { | |
480 | struct x509_parse_context *ctx = context; | |
46963b77 | 481 | struct asymmetric_key_id *kid; |
c26fd69f | 482 | const unsigned char *v = value; |
c26fd69f DH |
483 | |
484 | pr_debug("Extension: %u\n", ctx->last_oid); | |
485 | ||
486 | if (ctx->last_oid == OID_subjectKeyIdentifier) { | |
487 | /* Get hold of the key fingerprint */ | |
46963b77 | 488 | if (ctx->cert->skid || vlen < 3) |
c26fd69f DH |
489 | return -EBADMSG; |
490 | if (v[0] != ASN1_OTS || v[1] != vlen - 2) | |
491 | return -EBADMSG; | |
492 | v += 2; | |
493 | vlen -= 2; | |
494 | ||
dd2f6c44 DH |
495 | ctx->cert->raw_skid_size = vlen; |
496 | ctx->cert->raw_skid = v; | |
a4c6e57f | 497 | kid = asymmetric_key_generate_id(v, vlen, "", 0); |
46963b77 DH |
498 | if (IS_ERR(kid)) |
499 | return PTR_ERR(kid); | |
500 | ctx->cert->skid = kid; | |
501 | pr_debug("subjkeyid %*phN\n", kid->len, kid->data); | |
c26fd69f DH |
502 | return 0; |
503 | } | |
504 | ||
505 | if (ctx->last_oid == OID_authorityKeyIdentifier) { | |
506 | /* Get hold of the CA key fingerprint */ | |
b92e6570 DH |
507 | ctx->raw_akid = v; |
508 | ctx->raw_akid_size = vlen; | |
c26fd69f DH |
509 | return 0; |
510 | } | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
fd19a3d1 DH |
515 | /** |
516 | * x509_decode_time - Decode an X.509 time ASN.1 object | |
517 | * @_t: The time to fill in | |
518 | * @hdrlen: The length of the object header | |
519 | * @tag: The object tag | |
520 | * @value: The object value | |
521 | * @vlen: The size of the object value | |
522 | * | |
523 | * Decode an ASN.1 universal time or generalised time field into a struct the | |
524 | * kernel can handle and check it for validity. The time is decoded thus: | |
525 | * | |
526 | * [RFC5280 ยง4.1.2.5] | |
527 | * CAs conforming to this profile MUST always encode certificate validity | |
528 | * dates through the year 2049 as UTCTime; certificate validity dates in | |
529 | * 2050 or later MUST be encoded as GeneralizedTime. Conforming | |
530 | * applications MUST be able to process validity dates that are encoded in | |
531 | * either UTCTime or GeneralizedTime. | |
c26fd69f | 532 | */ |
fd19a3d1 DH |
533 | int x509_decode_time(time64_t *_t, size_t hdrlen, |
534 | unsigned char tag, | |
535 | const unsigned char *value, size_t vlen) | |
c26fd69f | 536 | { |
ac4cbedf | 537 | static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30, |
fd19a3d1 | 538 | 31, 31, 30, 31, 30, 31 }; |
c26fd69f | 539 | const unsigned char *p = value; |
fd19a3d1 | 540 | unsigned year, mon, day, hour, min, sec, mon_len; |
c26fd69f | 541 | |
fd19a3d1 | 542 | #define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; }) |
c26fd69f DH |
543 | #define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; }) |
544 | ||
545 | if (tag == ASN1_UNITIM) { | |
546 | /* UTCTime: YYMMDDHHMMSSZ */ | |
547 | if (vlen != 13) | |
548 | goto unsupported_time; | |
fd19a3d1 DH |
549 | year = DD2bin(p); |
550 | if (year >= 50) | |
551 | year += 1900; | |
c26fd69f | 552 | else |
fd19a3d1 | 553 | year += 2000; |
c26fd69f DH |
554 | } else if (tag == ASN1_GENTIM) { |
555 | /* GenTime: YYYYMMDDHHMMSSZ */ | |
556 | if (vlen != 15) | |
557 | goto unsupported_time; | |
fd19a3d1 DH |
558 | year = DD2bin(p) * 100 + DD2bin(p); |
559 | if (year >= 1950 && year <= 2049) | |
560 | goto invalid_time; | |
c26fd69f DH |
561 | } else { |
562 | goto unsupported_time; | |
563 | } | |
564 | ||
fd19a3d1 DH |
565 | mon = DD2bin(p); |
566 | day = DD2bin(p); | |
567 | hour = DD2bin(p); | |
568 | min = DD2bin(p); | |
569 | sec = DD2bin(p); | |
c26fd69f DH |
570 | |
571 | if (*p != 'Z') | |
572 | goto unsupported_time; | |
573 | ||
cc25b994 DH |
574 | if (year < 1970 || |
575 | mon < 1 || mon > 12) | |
576 | goto invalid_time; | |
577 | ||
578 | mon_len = month_lengths[mon - 1]; | |
fd19a3d1 DH |
579 | if (mon == 2) { |
580 | if (year % 4 == 0) { | |
581 | mon_len = 29; | |
582 | if (year % 100 == 0) { | |
ac4cbedf DH |
583 | mon_len = 28; |
584 | if (year % 400 == 0) | |
585 | mon_len = 29; | |
fd19a3d1 DH |
586 | } |
587 | } | |
588 | } | |
589 | ||
cc25b994 | 590 | if (day < 1 || day > mon_len || |
7650cb80 | 591 | hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */ |
4dd17c9c | 592 | min > 59 || |
da02559c | 593 | sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */ |
fd19a3d1 | 594 | goto invalid_time; |
cc25b994 | 595 | |
fd19a3d1 | 596 | *_t = mktime64(year, mon, day, hour, min, sec); |
c26fd69f DH |
597 | return 0; |
598 | ||
599 | unsupported_time: | |
fd19a3d1 DH |
600 | pr_debug("Got unsupported time [tag %02x]: '%*phN'\n", |
601 | tag, (int)vlen, value); | |
602 | return -EBADMSG; | |
603 | invalid_time: | |
604 | pr_debug("Got invalid time [tag %02x]: '%*phN'\n", | |
605 | tag, (int)vlen, value); | |
c26fd69f DH |
606 | return -EBADMSG; |
607 | } | |
fd19a3d1 | 608 | EXPORT_SYMBOL_GPL(x509_decode_time); |
c26fd69f DH |
609 | |
610 | int x509_note_not_before(void *context, size_t hdrlen, | |
611 | unsigned char tag, | |
612 | const void *value, size_t vlen) | |
613 | { | |
614 | struct x509_parse_context *ctx = context; | |
fd19a3d1 | 615 | return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen); |
c26fd69f DH |
616 | } |
617 | ||
618 | int x509_note_not_after(void *context, size_t hdrlen, | |
619 | unsigned char tag, | |
620 | const void *value, size_t vlen) | |
621 | { | |
622 | struct x509_parse_context *ctx = context; | |
fd19a3d1 | 623 | return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen); |
c26fd69f | 624 | } |
b92e6570 DH |
625 | |
626 | /* | |
627 | * Note a key identifier-based AuthorityKeyIdentifier | |
628 | */ | |
629 | int x509_akid_note_kid(void *context, size_t hdrlen, | |
630 | unsigned char tag, | |
631 | const void *value, size_t vlen) | |
632 | { | |
633 | struct x509_parse_context *ctx = context; | |
634 | struct asymmetric_key_id *kid; | |
635 | ||
636 | pr_debug("AKID: keyid: %*phN\n", (int)vlen, value); | |
637 | ||
77d0910d | 638 | if (ctx->cert->sig->auth_ids[1]) |
b92e6570 DH |
639 | return 0; |
640 | ||
a4c6e57f | 641 | kid = asymmetric_key_generate_id(value, vlen, "", 0); |
b92e6570 DH |
642 | if (IS_ERR(kid)) |
643 | return PTR_ERR(kid); | |
644 | pr_debug("authkeyid %*phN\n", kid->len, kid->data); | |
77d0910d | 645 | ctx->cert->sig->auth_ids[1] = kid; |
b92e6570 DH |
646 | return 0; |
647 | } | |
648 | ||
649 | /* | |
650 | * Note a directoryName in an AuthorityKeyIdentifier | |
651 | */ | |
652 | int x509_akid_note_name(void *context, size_t hdrlen, | |
653 | unsigned char tag, | |
654 | const void *value, size_t vlen) | |
655 | { | |
656 | struct x509_parse_context *ctx = context; | |
657 | ||
658 | pr_debug("AKID: name: %*phN\n", (int)vlen, value); | |
659 | ||
660 | ctx->akid_raw_issuer = value; | |
661 | ctx->akid_raw_issuer_size = vlen; | |
662 | return 0; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Note a serial number in an AuthorityKeyIdentifier | |
667 | */ | |
668 | int x509_akid_note_serial(void *context, size_t hdrlen, | |
669 | unsigned char tag, | |
670 | const void *value, size_t vlen) | |
671 | { | |
672 | struct x509_parse_context *ctx = context; | |
673 | struct asymmetric_key_id *kid; | |
674 | ||
675 | pr_debug("AKID: serial: %*phN\n", (int)vlen, value); | |
676 | ||
77d0910d | 677 | if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0]) |
b92e6570 DH |
678 | return 0; |
679 | ||
680 | kid = asymmetric_key_generate_id(value, | |
681 | vlen, | |
682 | ctx->akid_raw_issuer, | |
683 | ctx->akid_raw_issuer_size); | |
684 | if (IS_ERR(kid)) | |
685 | return PTR_ERR(kid); | |
686 | ||
687 | pr_debug("authkeyid %*phN\n", kid->len, kid->data); | |
77d0910d | 688 | ctx->cert->sig->auth_ids[0] = kid; |
b92e6570 DH |
689 | return 0; |
690 | } |