1// SPDX-License-Identifier: GPL-2.0-or-later
2/* X.509 certificate parser
3 *
4 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#define pr_fmt(fmt) "X.509: "fmt
9#include <linux/kernel.h>
10#include <linux/export.h>
11#include <linux/slab.h>
12#include <linux/err.h>
13#include <linux/oid_registry.h>
14#include <crypto/public_key.h>
15#include "x509_parser.h"
16#include "x509.asn1.h"
17#include "x509_akid.asn1.h"
18
19struct x509_parse_context {
20 struct x509_certificate *cert; /* Certificate being constructed */
21 unsigned long data; /* Start of data */
22 const void *key; /* Key data */
23 size_t key_size; /* Size of key data */
24 const void *params; /* Key parameters */
25 size_t params_size; /* Size of key parameters */
26 enum OID key_algo; /* Algorithm used by the cert's key */
27 enum OID last_oid; /* Last OID encountered */
28 enum OID sig_algo; /* Algorithm used to sign the cert */
29 u8 o_size; /* Size of organizationName (O) */
30 u8 cn_size; /* Size of commonName (CN) */
31 u8 email_size; /* Size of emailAddress */
32 u16 o_offset; /* Offset of organizationName (O) */
33 u16 cn_offset; /* Offset of commonName (CN) */
34 u16 email_offset; /* Offset of emailAddress */
35 unsigned raw_akid_size;
36 const void *raw_akid; /* Raw authorityKeyId in ASN.1 */
37 const void *akid_raw_issuer; /* Raw directoryName in authorityKeyId */
38 unsigned akid_raw_issuer_size;
39};
40
41/*
42 * Free an X.509 certificate
43 */
44void x509_free_certificate(struct x509_certificate *cert)
45{
46 if (cert) {
47 public_key_free(key: cert->pub);
48 public_key_signature_free(sig: cert->sig);
49 kfree(objp: cert->issuer);
50 kfree(objp: cert->subject);
51 kfree(objp: cert->id);
52 kfree(objp: cert->skid);
53 kfree(objp: cert);
54 }
55}
56EXPORT_SYMBOL_GPL(x509_free_certificate);
57
58/*
59 * Parse an X.509 certificate
60 */
61struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
62{
63 struct x509_certificate *cert __free(x509_free_certificate);
64 struct x509_parse_context *ctx __free(kfree) = NULL;
65 struct asymmetric_key_id *kid;
66 long ret;
67
68 cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL);
69 if (!cert)
70 return ERR_PTR(error: -ENOMEM);
71 cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL);
72 if (!cert->pub)
73 return ERR_PTR(error: -ENOMEM);
74 cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL);
75 if (!cert->sig)
76 return ERR_PTR(error: -ENOMEM);
77 ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL);
78 if (!ctx)
79 return ERR_PTR(error: -ENOMEM);
80
81 ctx->cert = cert;
82 ctx->data = (unsigned long)data;
83
84 /* Attempt to decode the certificate */
85 ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen);
86 if (ret < 0)
87 return ERR_PTR(error: ret);
88
89 /* Decode the AuthorityKeyIdentifier */
90 if (ctx->raw_akid) {
91 pr_devel("AKID: %u %*phN\n",
92 ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid);
93 ret = asn1_ber_decoder(&x509_akid_decoder, ctx,
94 ctx->raw_akid, ctx->raw_akid_size);
95 if (ret < 0) {
96 pr_warn("Couldn't decode AuthKeyIdentifier\n");
97 return ERR_PTR(error: ret);
98 }
99 }
100
101 cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL);
102 if (!cert->pub->key)
103 return ERR_PTR(error: -ENOMEM);
104
105 cert->pub->keylen = ctx->key_size;
106
107 cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL);
108 if (!cert->pub->params)
109 return ERR_PTR(error: -ENOMEM);
110
111 cert->pub->paramlen = ctx->params_size;
112 cert->pub->algo = ctx->key_algo;
113
114 /* Grab the signature bits */
115 ret = x509_get_sig_params(cert);
116 if (ret < 0)
117 return ERR_PTR(error: ret);
118
119 /* Generate cert issuer + serial number key ID */
120 kid = asymmetric_key_generate_id(val_1: cert->raw_serial,
121 len_1: cert->raw_serial_size,
122 val_2: cert->raw_issuer,
123 len_2: cert->raw_issuer_size);
124 if (IS_ERR(ptr: kid))
125 return ERR_CAST(ptr: kid);
126 cert->id = kid;
127
128 /* Detect self-signed certificates */
129 ret = x509_check_for_self_signed(cert);
130 if (ret < 0)
131 return ERR_PTR(error: ret);
132
133 return_ptr(cert);
134}
135EXPORT_SYMBOL_GPL(x509_cert_parse);
136
137/*
138 * Note an OID when we find one for later processing when we know how
139 * to interpret it.
140 */
141int x509_note_OID(void *context, size_t hdrlen,
142 unsigned char tag,
143 const void *value, size_t vlen)
144{
145 struct x509_parse_context *ctx = context;
146
147 ctx->last_oid = look_up_OID(data: value, datasize: vlen);
148 if (ctx->last_oid == OID__NR) {
149 char buffer[50];
150 sprint_oid(value, vlen, buffer, sizeof(buffer));
151 pr_debug("Unknown OID: [%lu] %s\n",
152 (unsigned long)value - ctx->data, buffer);
153 }
154 return 0;
155}
156
157/*
158 * Save the position of the TBS data so that we can check the signature over it
159 * later.
160 */
161int x509_note_tbs_certificate(void *context, size_t hdrlen,
162 unsigned char tag,
163 const void *value, size_t vlen)
164{
165 struct x509_parse_context *ctx = context;
166
167 pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n",
168 hdrlen, tag, (unsigned long)value - ctx->data, vlen);
169
170 ctx->cert->tbs = value - hdrlen;
171 ctx->cert->tbs_size = vlen + hdrlen;
172 return 0;
173}
174
175/*
176 * Record the algorithm that was used to sign this certificate.
177 */
178int x509_note_sig_algo(void *context, size_t hdrlen, unsigned char tag,
179 const void *value, size_t vlen)
180{
181 struct x509_parse_context *ctx = context;
182
183 pr_debug("PubKey Algo: %u\n", ctx->last_oid);
184
185 switch (ctx->last_oid) {
186 default:
187 return -ENOPKG; /* Unsupported combination */
188
189 case OID_sha1WithRSAEncryption:
190 ctx->cert->sig->hash_algo = "sha1";
191 goto rsa_pkcs1;
192
193 case OID_sha256WithRSAEncryption:
194 ctx->cert->sig->hash_algo = "sha256";
195 goto rsa_pkcs1;
196
197 case OID_sha384WithRSAEncryption:
198 ctx->cert->sig->hash_algo = "sha384";
199 goto rsa_pkcs1;
200
201 case OID_sha512WithRSAEncryption:
202 ctx->cert->sig->hash_algo = "sha512";
203 goto rsa_pkcs1;
204
205 case OID_sha224WithRSAEncryption:
206 ctx->cert->sig->hash_algo = "sha224";
207 goto rsa_pkcs1;
208
209 case OID_id_ecdsa_with_sha1:
210 ctx->cert->sig->hash_algo = "sha1";
211 goto ecdsa;
212
213 case OID_id_rsassa_pkcs1_v1_5_with_sha3_256:
214 ctx->cert->sig->hash_algo = "sha3-256";
215 goto rsa_pkcs1;
216
217 case OID_id_rsassa_pkcs1_v1_5_with_sha3_384:
218 ctx->cert->sig->hash_algo = "sha3-384";
219 goto rsa_pkcs1;
220
221 case OID_id_rsassa_pkcs1_v1_5_with_sha3_512:
222 ctx->cert->sig->hash_algo = "sha3-512";
223 goto rsa_pkcs1;
224
225 case OID_id_ecdsa_with_sha224:
226 ctx->cert->sig->hash_algo = "sha224";
227 goto ecdsa;
228
229 case OID_id_ecdsa_with_sha256:
230 ctx->cert->sig->hash_algo = "sha256";
231 goto ecdsa;
232
233 case OID_id_ecdsa_with_sha384:
234 ctx->cert->sig->hash_algo = "sha384";
235 goto ecdsa;
236
237 case OID_id_ecdsa_with_sha512:
238 ctx->cert->sig->hash_algo = "sha512";
239 goto ecdsa;
240
241 case OID_id_ecdsa_with_sha3_256:
242 ctx->cert->sig->hash_algo = "sha3-256";
243 goto ecdsa;
244
245 case OID_id_ecdsa_with_sha3_384:
246 ctx->cert->sig->hash_algo = "sha3-384";
247 goto ecdsa;
248
249 case OID_id_ecdsa_with_sha3_512:
250 ctx->cert->sig->hash_algo = "sha3-512";
251 goto ecdsa;
252
253 case OID_gost2012Signature256:
254 ctx->cert->sig->hash_algo = "streebog256";
255 goto ecrdsa;
256
257 case OID_gost2012Signature512:
258 ctx->cert->sig->hash_algo = "streebog512";
259 goto ecrdsa;
260 }
261
262rsa_pkcs1:
263 ctx->cert->sig->pkey_algo = "rsa";
264 ctx->cert->sig->encoding = "pkcs1";
265 ctx->sig_algo = ctx->last_oid;
266 return 0;
267ecrdsa:
268 ctx->cert->sig->pkey_algo = "ecrdsa";
269 ctx->cert->sig->encoding = "raw";
270 ctx->sig_algo = ctx->last_oid;
271 return 0;
272ecdsa:
273 ctx->cert->sig->pkey_algo = "ecdsa";
274 ctx->cert->sig->encoding = "x962";
275 ctx->sig_algo = ctx->last_oid;
276 return 0;
277}
278
279/*
280 * Note the whereabouts and type of the signature.
281 */
282int x509_note_signature(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 pr_debug("Signature: alg=%u, size=%zu\n", ctx->last_oid, vlen);
289
290 /*
291 * In X.509 certificates, the signature's algorithm is stored in two
292 * places: inside the TBSCertificate (the data that is signed), and
293 * alongside the signature. These *must* match.
294 */
295 if (ctx->last_oid != ctx->sig_algo) {
296 pr_warn("signatureAlgorithm (%u) differs from tbsCertificate.signature (%u)\n",
297 ctx->last_oid, ctx->sig_algo);
298 return -EINVAL;
299 }
300
301 if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 ||
302 strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0 ||
303 strcmp(ctx->cert->sig->pkey_algo, "ecdsa") == 0) {
304 /* Discard the BIT STRING metadata */
305 if (vlen < 1 || *(const u8 *)value != 0)
306 return -EBADMSG;
307
308 value++;
309 vlen--;
310 }
311
312 ctx->cert->raw_sig = value;
313 ctx->cert->raw_sig_size = vlen;
314 return 0;
315}
316
317/*
318 * Note the certificate serial number
319 */
320int x509_note_serial(void *context, size_t hdrlen,
321 unsigned char tag,
322 const void *value, size_t vlen)
323{
324 struct x509_parse_context *ctx = context;
325 ctx->cert->raw_serial = value;
326 ctx->cert->raw_serial_size = vlen;
327 return 0;
328}
329
330/*
331 * Note some of the name segments from which we'll fabricate a name.
332 */
333int x509_extract_name_segment(void *context, size_t hdrlen,
334 unsigned char tag,
335 const void *value, size_t vlen)
336{
337 struct x509_parse_context *ctx = context;
338
339 switch (ctx->last_oid) {
340 case OID_commonName:
341 ctx->cn_size = vlen;
342 ctx->cn_offset = (unsigned long)value - ctx->data;
343 break;
344 case OID_organizationName:
345 ctx->o_size = vlen;
346 ctx->o_offset = (unsigned long)value - ctx->data;
347 break;
348 case OID_email_address:
349 ctx->email_size = vlen;
350 ctx->email_offset = (unsigned long)value - ctx->data;
351 break;
352 default:
353 break;
354 }
355
356 return 0;
357}
358
359/*
360 * Fabricate and save the issuer and subject names
361 */
362static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen,
363 unsigned char tag,
364 char **_name, size_t vlen)
365{
366 const void *name, *data = (const void *)ctx->data;
367 size_t namesize;
368 char *buffer;
369
370 if (*_name)
371 return -EINVAL;
372
373 /* Empty name string if no material */
374 if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) {
375 buffer = kzalloc(1, GFP_KERNEL);
376 if (!buffer)
377 return -ENOMEM;
378 goto done;
379 }
380
381 if (ctx->cn_size && ctx->o_size) {
382 /* Consider combining O and CN, but use only the CN if it is
383 * prefixed by the O, or a significant portion thereof.
384 */
385 namesize = ctx->cn_size;
386 name = data + ctx->cn_offset;
387 if (ctx->cn_size >= ctx->o_size &&
388 memcmp(p: data + ctx->cn_offset, q: data + ctx->o_offset,
389 size: ctx->o_size) == 0)
390 goto single_component;
391 if (ctx->cn_size >= 7 &&
392 ctx->o_size >= 7 &&
393 memcmp(p: data + ctx->cn_offset, q: data + ctx->o_offset, size: 7) == 0)
394 goto single_component;
395
396 buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1,
397 GFP_KERNEL);
398 if (!buffer)
399 return -ENOMEM;
400
401 memcpy(buffer,
402 data + ctx->o_offset, ctx->o_size);
403 buffer[ctx->o_size + 0] = ':';
404 buffer[ctx->o_size + 1] = ' ';
405 memcpy(buffer + ctx->o_size + 2,
406 data + ctx->cn_offset, ctx->cn_size);
407 buffer[ctx->o_size + 2 + ctx->cn_size] = 0;
408 goto done;
409
410 } else if (ctx->cn_size) {
411 namesize = ctx->cn_size;
412 name = data + ctx->cn_offset;
413 } else if (ctx->o_size) {
414 namesize = ctx->o_size;
415 name = data + ctx->o_offset;
416 } else {
417 namesize = ctx->email_size;
418 name = data + ctx->email_offset;
419 }
420
421single_component:
422 buffer = kmalloc(namesize + 1, GFP_KERNEL);
423 if (!buffer)
424 return -ENOMEM;
425 memcpy(buffer, name, namesize);
426 buffer[namesize] = 0;
427
428done:
429 *_name = buffer;
430 ctx->cn_size = 0;
431 ctx->o_size = 0;
432 ctx->email_size = 0;
433 return 0;
434}
435
436int x509_note_issuer(void *context, size_t hdrlen,
437 unsigned char tag,
438 const void *value, size_t vlen)
439{
440 struct x509_parse_context *ctx = context;
441 struct asymmetric_key_id *kid;
442
443 ctx->cert->raw_issuer = value;
444 ctx->cert->raw_issuer_size = vlen;
445
446 if (!ctx->cert->sig->auth_ids[2]) {
447 kid = asymmetric_key_generate_id(val_1: value, len_1: vlen, val_2: "", len_2: 0);
448 if (IS_ERR(ptr: kid))
449 return PTR_ERR(ptr: kid);
450 ctx->cert->sig->auth_ids[2] = kid;
451 }
452
453 return x509_fabricate_name(ctx, hdrlen, tag, name: &ctx->cert->issuer, vlen);
454}
455
456int x509_note_subject(void *context, size_t hdrlen,
457 unsigned char tag,
458 const void *value, size_t vlen)
459{
460 struct x509_parse_context *ctx = context;
461 ctx->cert->raw_subject = value;
462 ctx->cert->raw_subject_size = vlen;
463 return x509_fabricate_name(ctx, hdrlen, tag, name: &ctx->cert->subject, vlen);
464}
465
466/*
467 * Extract the parameters for the public key
468 */
469int x509_note_params(void *context, size_t hdrlen,
470 unsigned char tag,
471 const void *value, size_t vlen)
472{
473 struct x509_parse_context *ctx = context;
474
475 /*
476 * AlgorithmIdentifier is used three times in the x509, we should skip
477 * first and ignore third, using second one which is after subject and
478 * before subjectPublicKey.
479 */
480 if (!ctx->cert->raw_subject || ctx->key)
481 return 0;
482 ctx->params = value - hdrlen;
483 ctx->params_size = vlen + hdrlen;
484 return 0;
485}
486
487/*
488 * Extract the data for the public key algorithm
489 */
490int x509_extract_key_data(void *context, size_t hdrlen,
491 unsigned char tag,
492 const void *value, size_t vlen)
493{
494 struct x509_parse_context *ctx = context;
495 enum OID oid;
496
497 ctx->key_algo = ctx->last_oid;
498 switch (ctx->last_oid) {
499 case OID_rsaEncryption:
500 ctx->cert->pub->pkey_algo = "rsa";
501 break;
502 case OID_gost2012PKey256:
503 case OID_gost2012PKey512:
504 ctx->cert->pub->pkey_algo = "ecrdsa";
505 break;
506 case OID_id_ecPublicKey:
507 if (parse_OID(data: ctx->params, datasize: ctx->params_size, oid: &oid) != 0)
508 return -EBADMSG;
509
510 switch (oid) {
511 case OID_id_prime192v1:
512 ctx->cert->pub->pkey_algo = "ecdsa-nist-p192";
513 break;
514 case OID_id_prime256v1:
515 ctx->cert->pub->pkey_algo = "ecdsa-nist-p256";
516 break;
517 case OID_id_ansip384r1:
518 ctx->cert->pub->pkey_algo = "ecdsa-nist-p384";
519 break;
520 case OID_id_ansip521r1:
521 ctx->cert->pub->pkey_algo = "ecdsa-nist-p521";
522 break;
523 default:
524 return -ENOPKG;
525 }
526 break;
527 default:
528 return -ENOPKG;
529 }
530
531 /* Discard the BIT STRING metadata */
532 if (vlen < 1 || *(const u8 *)value != 0)
533 return -EBADMSG;
534 ctx->key = value + 1;
535 ctx->key_size = vlen - 1;
536 return 0;
537}
538
539/* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */
540#define SEQ_TAG_KEYID (ASN1_CONT << 6)
541
542/*
543 * Process certificate extensions that are used to qualify the certificate.
544 */
545int x509_process_extension(void *context, size_t hdrlen,
546 unsigned char tag,
547 const void *value, size_t vlen)
548{
549 struct x509_parse_context *ctx = context;
550 struct asymmetric_key_id *kid;
551 const unsigned char *v = value;
552
553 pr_debug("Extension: %u\n", ctx->last_oid);
554
555 if (ctx->last_oid == OID_subjectKeyIdentifier) {
556 /* Get hold of the key fingerprint */
557 if (ctx->cert->skid || vlen < 3)
558 return -EBADMSG;
559 if (v[0] != ASN1_OTS || v[1] != vlen - 2)
560 return -EBADMSG;
561 v += 2;
562 vlen -= 2;
563
564 ctx->cert->raw_skid_size = vlen;
565 ctx->cert->raw_skid = v;
566 kid = asymmetric_key_generate_id(val_1: v, len_1: vlen, val_2: "", len_2: 0);
567 if (IS_ERR(ptr: kid))
568 return PTR_ERR(ptr: kid);
569 ctx->cert->skid = kid;
570 pr_debug("subjkeyid %*phN\n", kid->len, kid->data);
571 return 0;
572 }
573
574 if (ctx->last_oid == OID_keyUsage) {
575 /*
576 * Get hold of the keyUsage bit string
577 * v[1] is the encoding size
578 * (Expect either 0x02 or 0x03, making it 1 or 2 bytes)
579 * v[2] is the number of unused bits in the bit string
580 * (If >= 3 keyCertSign is missing when v[1] = 0x02)
581 * v[3] and possibly v[4] contain the bit string
582 *
583 * From RFC 5280 4.2.1.3:
584 * 0x04 is where keyCertSign lands in this bit string
585 * 0x80 is where digitalSignature lands in this bit string
586 */
587 if (v[0] != ASN1_BTS)
588 return -EBADMSG;
589 if (vlen < 4)
590 return -EBADMSG;
591 if (v[2] >= 8)
592 return -EBADMSG;
593 if (v[3] & 0x80)
594 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_DIGITALSIG;
595 if (v[1] == 0x02 && v[2] <= 2 && (v[3] & 0x04))
596 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_KEYCERTSIGN;
597 else if (vlen > 4 && v[1] == 0x03 && (v[3] & 0x04))
598 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_KEYCERTSIGN;
599 return 0;
600 }
601
602 if (ctx->last_oid == OID_authorityKeyIdentifier) {
603 /* Get hold of the CA key fingerprint */
604 ctx->raw_akid = v;
605 ctx->raw_akid_size = vlen;
606 return 0;
607 }
608
609 if (ctx->last_oid == OID_basicConstraints) {
610 /*
611 * Get hold of the basicConstraints
612 * v[1] is the encoding size
613 * (Expect 0x2 or greater, making it 1 or more bytes)
614 * v[2] is the encoding type
615 * (Expect an ASN1_BOOL for the CA)
616 * v[3] is the contents of the ASN1_BOOL
617 * (Expect 1 if the CA is TRUE)
618 * vlen should match the entire extension size
619 */
620 if (v[0] != (ASN1_CONS_BIT | ASN1_SEQ))
621 return -EBADMSG;
622 if (vlen < 2)
623 return -EBADMSG;
624 if (v[1] != vlen - 2)
625 return -EBADMSG;
626 if (vlen >= 4 && v[1] != 0 && v[2] == ASN1_BOOL && v[3] == 1)
627 ctx->cert->pub->key_eflags |= 1 << KEY_EFLAG_CA;
628 return 0;
629 }
630
631 return 0;
632}
633
634/**
635 * x509_decode_time - Decode an X.509 time ASN.1 object
636 * @_t: The time to fill in
637 * @hdrlen: The length of the object header
638 * @tag: The object tag
639 * @value: The object value
640 * @vlen: The size of the object value
641 *
642 * Decode an ASN.1 universal time or generalised time field into a struct the
643 * kernel can handle and check it for validity. The time is decoded thus:
644 *
645 * [RFC5280 ยง4.1.2.5]
646 * CAs conforming to this profile MUST always encode certificate validity
647 * dates through the year 2049 as UTCTime; certificate validity dates in
648 * 2050 or later MUST be encoded as GeneralizedTime. Conforming
649 * applications MUST be able to process validity dates that are encoded in
650 * either UTCTime or GeneralizedTime.
651 */
652int x509_decode_time(time64_t *_t, size_t hdrlen,
653 unsigned char tag,
654 const unsigned char *value, size_t vlen)
655{
656 static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30,
657 31, 31, 30, 31, 30, 31 };
658 const unsigned char *p = value;
659 unsigned year, mon, day, hour, min, sec, mon_len;
660
661#define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; })
662#define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; })
663
664 if (tag == ASN1_UNITIM) {
665 /* UTCTime: YYMMDDHHMMSSZ */
666 if (vlen != 13)
667 goto unsupported_time;
668 year = DD2bin(p);
669 if (year >= 50)
670 year += 1900;
671 else
672 year += 2000;
673 } else if (tag == ASN1_GENTIM) {
674 /* GenTime: YYYYMMDDHHMMSSZ */
675 if (vlen != 15)
676 goto unsupported_time;
677 year = DD2bin(p) * 100 + DD2bin(p);
678 if (year >= 1950 && year <= 2049)
679 goto invalid_time;
680 } else {
681 goto unsupported_time;
682 }
683
684 mon = DD2bin(p);
685 day = DD2bin(p);
686 hour = DD2bin(p);
687 min = DD2bin(p);
688 sec = DD2bin(p);
689
690 if (*p != 'Z')
691 goto unsupported_time;
692
693 if (year < 1970 ||
694 mon < 1 || mon > 12)
695 goto invalid_time;
696
697 mon_len = month_lengths[mon - 1];
698 if (mon == 2) {
699 if (year % 4 == 0) {
700 mon_len = 29;
701 if (year % 100 == 0) {
702 mon_len = 28;
703 if (year % 400 == 0)
704 mon_len = 29;
705 }
706 }
707 }
708
709 if (day < 1 || day > mon_len ||
710 hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */
711 min > 59 ||
712 sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */
713 goto invalid_time;
714
715 *_t = mktime64(year, mon, day, hour, min, sec);
716 return 0;
717
718unsupported_time:
719 pr_debug("Got unsupported time [tag %02x]: '%*phN'\n",
720 tag, (int)vlen, value);
721 return -EBADMSG;
722invalid_time:
723 pr_debug("Got invalid time [tag %02x]: '%*phN'\n",
724 tag, (int)vlen, value);
725 return -EBADMSG;
726}
727EXPORT_SYMBOL_GPL(x509_decode_time);
728
729int x509_note_not_before(void *context, size_t hdrlen,
730 unsigned char tag,
731 const void *value, size_t vlen)
732{
733 struct x509_parse_context *ctx = context;
734 return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen);
735}
736
737int x509_note_not_after(void *context, size_t hdrlen,
738 unsigned char tag,
739 const void *value, size_t vlen)
740{
741 struct x509_parse_context *ctx = context;
742 return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen);
743}
744
745/*
746 * Note a key identifier-based AuthorityKeyIdentifier
747 */
748int x509_akid_note_kid(void *context, size_t hdrlen,
749 unsigned char tag,
750 const void *value, size_t vlen)
751{
752 struct x509_parse_context *ctx = context;
753 struct asymmetric_key_id *kid;
754
755 pr_debug("AKID: keyid: %*phN\n", (int)vlen, value);
756
757 if (ctx->cert->sig->auth_ids[1])
758 return 0;
759
760 kid = asymmetric_key_generate_id(val_1: value, len_1: vlen, val_2: "", len_2: 0);
761 if (IS_ERR(ptr: kid))
762 return PTR_ERR(ptr: kid);
763 pr_debug("authkeyid %*phN\n", kid->len, kid->data);
764 ctx->cert->sig->auth_ids[1] = kid;
765 return 0;
766}
767
768/*
769 * Note a directoryName in an AuthorityKeyIdentifier
770 */
771int x509_akid_note_name(void *context, size_t hdrlen,
772 unsigned char tag,
773 const void *value, size_t vlen)
774{
775 struct x509_parse_context *ctx = context;
776
777 pr_debug("AKID: name: %*phN\n", (int)vlen, value);
778
779 ctx->akid_raw_issuer = value;
780 ctx->akid_raw_issuer_size = vlen;
781 return 0;
782}
783
784/*
785 * Note a serial number in an AuthorityKeyIdentifier
786 */
787int x509_akid_note_serial(void *context, size_t hdrlen,
788 unsigned char tag,
789 const void *value, size_t vlen)
790{
791 struct x509_parse_context *ctx = context;
792 struct asymmetric_key_id *kid;
793
794 pr_debug("AKID: serial: %*phN\n", (int)vlen, value);
795
796 if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0])
797 return 0;
798
799 kid = asymmetric_key_generate_id(val_1: value,
800 len_1: vlen,
801 val_2: ctx->akid_raw_issuer,
802 len_2: ctx->akid_raw_issuer_size);
803 if (IS_ERR(ptr: kid))
804 return PTR_ERR(ptr: kid);
805
806 pr_debug("authkeyid %*phN\n", kid->len, kid->data);
807 ctx->cert->sig->auth_ids[0] = kid;
808 return 0;
809}
810

source code of linux/crypto/asymmetric_keys/x509_cert_parser.c