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
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 */
25 const void *params; /* Key parameters */
26 size_t params_size; /* Size of key parameters */
27 enum OID key_algo; /* Public key algorithm */
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 */
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;
41 };
42
43 /*
44 * Free an X.509 certificate
45 */
x509_free_certificate(struct x509_certificate * cert)46 void x509_free_certificate(struct x509_certificate *cert)
47 {
48 if (cert) {
49 public_key_free(cert->pub);
50 public_key_signature_free(cert->sig);
51 kfree(cert->issuer);
52 kfree(cert->subject);
53 kfree(cert->id);
54 kfree(cert->skid);
55 kfree(cert);
56 }
57 }
58 EXPORT_SYMBOL_GPL(x509_free_certificate);
59
60 /*
61 * Parse an X.509 certificate
62 */
x509_cert_parse(const void * data,size_t datalen)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;
67 struct asymmetric_key_id *kid;
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;
77 cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL);
78 if (!cert->sig)
79 goto error_no_ctx;
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
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
104 ret = -ENOMEM;
105 cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL);
106 if (!cert->pub->key)
107 goto error_decode;
108
109 cert->pub->keylen = ctx->key_size;
110
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
118 /* Grab the signature bits */
119 ret = x509_get_sig_params(cert);
120 if (ret < 0)
121 goto error_decode;
122
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
134 /* Detect self-signed certificates */
135 ret = x509_check_for_self_signed(cert);
136 if (ret < 0)
137 goto error_decode;
138
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 }
149 EXPORT_SYMBOL_GPL(x509_cert_parse);
150
151 /*
152 * Note an OID when we find one for later processing when we know how
153 * to interpret it.
154 */
x509_note_OID(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)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));
165 pr_debug("Unknown OID: [%lu] %s\n",
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 */
x509_note_tbs_certificate(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)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 */
x509_note_pkey_algo(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)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:
207 ctx->cert->sig->hash_algo = "md4";
208 goto rsa_pkcs1;
209
210 case OID_sha1WithRSAEncryption:
211 ctx->cert->sig->hash_algo = "sha1";
212 goto rsa_pkcs1;
213
214 case OID_sha256WithRSAEncryption:
215 ctx->cert->sig->hash_algo = "sha256";
216 goto rsa_pkcs1;
217
218 case OID_sha384WithRSAEncryption:
219 ctx->cert->sig->hash_algo = "sha384";
220 goto rsa_pkcs1;
221
222 case OID_sha512WithRSAEncryption:
223 ctx->cert->sig->hash_algo = "sha512";
224 goto rsa_pkcs1;
225
226 case OID_sha224WithRSAEncryption:
227 ctx->cert->sig->hash_algo = "sha224";
228 goto rsa_pkcs1;
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;
237
238 case OID_SM2_with_SM3:
239 ctx->cert->sig->hash_algo = "sm3";
240 goto sm2;
241 }
242
243 rsa_pkcs1:
244 ctx->cert->sig->pkey_algo = "rsa";
245 ctx->cert->sig->encoding = "pkcs1";
246 ctx->algo_oid = ctx->last_oid;
247 return 0;
248 ecrdsa:
249 ctx->cert->sig->pkey_algo = "ecrdsa";
250 ctx->cert->sig->encoding = "raw";
251 ctx->algo_oid = ctx->last_oid;
252 return 0;
253 sm2:
254 ctx->cert->sig->pkey_algo = "sm2";
255 ctx->cert->sig->encoding = "raw";
256 ctx->algo_oid = ctx->last_oid;
257 return 0;
258 }
259
260 /*
261 * Note the whereabouts and type of the signature.
262 */
x509_note_signature(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)263 int x509_note_signature(void *context, size_t hdrlen,
264 unsigned char tag,
265 const void *value, size_t vlen)
266 {
267 struct x509_parse_context *ctx = context;
268
269 pr_debug("Signature type: %u size %zu\n", ctx->last_oid, vlen);
270
271 if (ctx->last_oid != ctx->algo_oid) {
272 pr_warn("Got cert with pkey (%u) and sig (%u) algorithm OIDs\n",
273 ctx->algo_oid, ctx->last_oid);
274 return -EINVAL;
275 }
276
277 if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 ||
278 strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0 ||
279 strcmp(ctx->cert->sig->pkey_algo, "sm2") == 0) {
280 /* Discard the BIT STRING metadata */
281 if (vlen < 1 || *(const u8 *)value != 0)
282 return -EBADMSG;
283
284 value++;
285 vlen--;
286 }
287
288 ctx->cert->raw_sig = value;
289 ctx->cert->raw_sig_size = vlen;
290 return 0;
291 }
292
293 /*
294 * Note the certificate serial number
295 */
x509_note_serial(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)296 int x509_note_serial(void *context, size_t hdrlen,
297 unsigned char tag,
298 const void *value, size_t vlen)
299 {
300 struct x509_parse_context *ctx = context;
301 ctx->cert->raw_serial = value;
302 ctx->cert->raw_serial_size = vlen;
303 return 0;
304 }
305
306 /*
307 * Note some of the name segments from which we'll fabricate a name.
308 */
x509_extract_name_segment(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)309 int x509_extract_name_segment(void *context, size_t hdrlen,
310 unsigned char tag,
311 const void *value, size_t vlen)
312 {
313 struct x509_parse_context *ctx = context;
314
315 switch (ctx->last_oid) {
316 case OID_commonName:
317 ctx->cn_size = vlen;
318 ctx->cn_offset = (unsigned long)value - ctx->data;
319 break;
320 case OID_organizationName:
321 ctx->o_size = vlen;
322 ctx->o_offset = (unsigned long)value - ctx->data;
323 break;
324 case OID_email_address:
325 ctx->email_size = vlen;
326 ctx->email_offset = (unsigned long)value - ctx->data;
327 break;
328 default:
329 break;
330 }
331
332 return 0;
333 }
334
335 /*
336 * Fabricate and save the issuer and subject names
337 */
x509_fabricate_name(struct x509_parse_context * ctx,size_t hdrlen,unsigned char tag,char ** _name,size_t vlen)338 static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen,
339 unsigned char tag,
340 char **_name, size_t vlen)
341 {
342 const void *name, *data = (const void *)ctx->data;
343 size_t namesize;
344 char *buffer;
345
346 if (*_name)
347 return -EINVAL;
348
349 /* Empty name string if no material */
350 if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) {
351 buffer = kmalloc(1, GFP_KERNEL);
352 if (!buffer)
353 return -ENOMEM;
354 buffer[0] = 0;
355 goto done;
356 }
357
358 if (ctx->cn_size && ctx->o_size) {
359 /* Consider combining O and CN, but use only the CN if it is
360 * prefixed by the O, or a significant portion thereof.
361 */
362 namesize = ctx->cn_size;
363 name = data + ctx->cn_offset;
364 if (ctx->cn_size >= ctx->o_size &&
365 memcmp(data + ctx->cn_offset, data + ctx->o_offset,
366 ctx->o_size) == 0)
367 goto single_component;
368 if (ctx->cn_size >= 7 &&
369 ctx->o_size >= 7 &&
370 memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0)
371 goto single_component;
372
373 buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1,
374 GFP_KERNEL);
375 if (!buffer)
376 return -ENOMEM;
377
378 memcpy(buffer,
379 data + ctx->o_offset, ctx->o_size);
380 buffer[ctx->o_size + 0] = ':';
381 buffer[ctx->o_size + 1] = ' ';
382 memcpy(buffer + ctx->o_size + 2,
383 data + ctx->cn_offset, ctx->cn_size);
384 buffer[ctx->o_size + 2 + ctx->cn_size] = 0;
385 goto done;
386
387 } else if (ctx->cn_size) {
388 namesize = ctx->cn_size;
389 name = data + ctx->cn_offset;
390 } else if (ctx->o_size) {
391 namesize = ctx->o_size;
392 name = data + ctx->o_offset;
393 } else {
394 namesize = ctx->email_size;
395 name = data + ctx->email_offset;
396 }
397
398 single_component:
399 buffer = kmalloc(namesize + 1, GFP_KERNEL);
400 if (!buffer)
401 return -ENOMEM;
402 memcpy(buffer, name, namesize);
403 buffer[namesize] = 0;
404
405 done:
406 *_name = buffer;
407 ctx->cn_size = 0;
408 ctx->o_size = 0;
409 ctx->email_size = 0;
410 return 0;
411 }
412
x509_note_issuer(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)413 int x509_note_issuer(void *context, size_t hdrlen,
414 unsigned char tag,
415 const void *value, size_t vlen)
416 {
417 struct x509_parse_context *ctx = context;
418 ctx->cert->raw_issuer = value;
419 ctx->cert->raw_issuer_size = vlen;
420 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen);
421 }
422
x509_note_subject(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)423 int x509_note_subject(void *context, size_t hdrlen,
424 unsigned char tag,
425 const void *value, size_t vlen)
426 {
427 struct x509_parse_context *ctx = context;
428 ctx->cert->raw_subject = value;
429 ctx->cert->raw_subject_size = vlen;
430 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen);
431 }
432
433 /*
434 * Extract the parameters for the public key
435 */
x509_note_params(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)436 int x509_note_params(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
442 /*
443 * AlgorithmIdentifier is used three times in the x509, we should skip
444 * first and ignore third, using second one which is after subject and
445 * before subjectPublicKey.
446 */
447 if (!ctx->cert->raw_subject || ctx->key)
448 return 0;
449 ctx->params = value - hdrlen;
450 ctx->params_size = vlen + hdrlen;
451 return 0;
452 }
453
454 /*
455 * Extract the data for the public key algorithm
456 */
x509_extract_key_data(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)457 int x509_extract_key_data(void *context, size_t hdrlen,
458 unsigned char tag,
459 const void *value, size_t vlen)
460 {
461 struct x509_parse_context *ctx = context;
462
463 ctx->key_algo = ctx->last_oid;
464 switch (ctx->last_oid) {
465 case OID_rsaEncryption:
466 ctx->cert->pub->pkey_algo = "rsa";
467 break;
468 case OID_gost2012PKey256:
469 case OID_gost2012PKey512:
470 ctx->cert->pub->pkey_algo = "ecrdsa";
471 break;
472 case OID_id_ecPublicKey:
473 ctx->cert->pub->pkey_algo = "sm2";
474 break;
475 default:
476 return -ENOPKG;
477 }
478
479 /* Discard the BIT STRING metadata */
480 if (vlen < 1 || *(const u8 *)value != 0)
481 return -EBADMSG;
482 ctx->key = value + 1;
483 ctx->key_size = vlen - 1;
484 return 0;
485 }
486
487 /* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */
488 #define SEQ_TAG_KEYID (ASN1_CONT << 6)
489
490 /*
491 * Process certificate extensions that are used to qualify the certificate.
492 */
x509_process_extension(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)493 int x509_process_extension(void *context, size_t hdrlen,
494 unsigned char tag,
495 const void *value, size_t vlen)
496 {
497 struct x509_parse_context *ctx = context;
498 struct asymmetric_key_id *kid;
499 const unsigned char *v = value;
500
501 pr_debug("Extension: %u\n", ctx->last_oid);
502
503 if (ctx->last_oid == OID_subjectKeyIdentifier) {
504 /* Get hold of the key fingerprint */
505 if (ctx->cert->skid || vlen < 3)
506 return -EBADMSG;
507 if (v[0] != ASN1_OTS || v[1] != vlen - 2)
508 return -EBADMSG;
509 v += 2;
510 vlen -= 2;
511
512 ctx->cert->raw_skid_size = vlen;
513 ctx->cert->raw_skid = v;
514 kid = asymmetric_key_generate_id(v, vlen, "", 0);
515 if (IS_ERR(kid))
516 return PTR_ERR(kid);
517 ctx->cert->skid = kid;
518 pr_debug("subjkeyid %*phN\n", kid->len, kid->data);
519 return 0;
520 }
521
522 if (ctx->last_oid == OID_authorityKeyIdentifier) {
523 /* Get hold of the CA key fingerprint */
524 ctx->raw_akid = v;
525 ctx->raw_akid_size = vlen;
526 return 0;
527 }
528
529 return 0;
530 }
531
532 /**
533 * x509_decode_time - Decode an X.509 time ASN.1 object
534 * @_t: The time to fill in
535 * @hdrlen: The length of the object header
536 * @tag: The object tag
537 * @value: The object value
538 * @vlen: The size of the object value
539 *
540 * Decode an ASN.1 universal time or generalised time field into a struct the
541 * kernel can handle and check it for validity. The time is decoded thus:
542 *
543 * [RFC5280 ยง4.1.2.5]
544 * CAs conforming to this profile MUST always encode certificate validity
545 * dates through the year 2049 as UTCTime; certificate validity dates in
546 * 2050 or later MUST be encoded as GeneralizedTime. Conforming
547 * applications MUST be able to process validity dates that are encoded in
548 * either UTCTime or GeneralizedTime.
549 */
x509_decode_time(time64_t * _t,size_t hdrlen,unsigned char tag,const unsigned char * value,size_t vlen)550 int x509_decode_time(time64_t *_t, size_t hdrlen,
551 unsigned char tag,
552 const unsigned char *value, size_t vlen)
553 {
554 static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30,
555 31, 31, 30, 31, 30, 31 };
556 const unsigned char *p = value;
557 unsigned year, mon, day, hour, min, sec, mon_len;
558
559 #define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; })
560 #define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; })
561
562 if (tag == ASN1_UNITIM) {
563 /* UTCTime: YYMMDDHHMMSSZ */
564 if (vlen != 13)
565 goto unsupported_time;
566 year = DD2bin(p);
567 if (year >= 50)
568 year += 1900;
569 else
570 year += 2000;
571 } else if (tag == ASN1_GENTIM) {
572 /* GenTime: YYYYMMDDHHMMSSZ */
573 if (vlen != 15)
574 goto unsupported_time;
575 year = DD2bin(p) * 100 + DD2bin(p);
576 if (year >= 1950 && year <= 2049)
577 goto invalid_time;
578 } else {
579 goto unsupported_time;
580 }
581
582 mon = DD2bin(p);
583 day = DD2bin(p);
584 hour = DD2bin(p);
585 min = DD2bin(p);
586 sec = DD2bin(p);
587
588 if (*p != 'Z')
589 goto unsupported_time;
590
591 if (year < 1970 ||
592 mon < 1 || mon > 12)
593 goto invalid_time;
594
595 mon_len = month_lengths[mon - 1];
596 if (mon == 2) {
597 if (year % 4 == 0) {
598 mon_len = 29;
599 if (year % 100 == 0) {
600 mon_len = 28;
601 if (year % 400 == 0)
602 mon_len = 29;
603 }
604 }
605 }
606
607 if (day < 1 || day > mon_len ||
608 hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */
609 min > 59 ||
610 sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */
611 goto invalid_time;
612
613 *_t = mktime64(year, mon, day, hour, min, sec);
614 return 0;
615
616 unsupported_time:
617 pr_debug("Got unsupported time [tag %02x]: '%*phN'\n",
618 tag, (int)vlen, value);
619 return -EBADMSG;
620 invalid_time:
621 pr_debug("Got invalid time [tag %02x]: '%*phN'\n",
622 tag, (int)vlen, value);
623 return -EBADMSG;
624 }
625 EXPORT_SYMBOL_GPL(x509_decode_time);
626
x509_note_not_before(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)627 int x509_note_not_before(void *context, size_t hdrlen,
628 unsigned char tag,
629 const void *value, size_t vlen)
630 {
631 struct x509_parse_context *ctx = context;
632 return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen);
633 }
634
x509_note_not_after(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)635 int x509_note_not_after(void *context, size_t hdrlen,
636 unsigned char tag,
637 const void *value, size_t vlen)
638 {
639 struct x509_parse_context *ctx = context;
640 return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen);
641 }
642
643 /*
644 * Note a key identifier-based AuthorityKeyIdentifier
645 */
x509_akid_note_kid(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)646 int x509_akid_note_kid(void *context, size_t hdrlen,
647 unsigned char tag,
648 const void *value, size_t vlen)
649 {
650 struct x509_parse_context *ctx = context;
651 struct asymmetric_key_id *kid;
652
653 pr_debug("AKID: keyid: %*phN\n", (int)vlen, value);
654
655 if (ctx->cert->sig->auth_ids[1])
656 return 0;
657
658 kid = asymmetric_key_generate_id(value, vlen, "", 0);
659 if (IS_ERR(kid))
660 return PTR_ERR(kid);
661 pr_debug("authkeyid %*phN\n", kid->len, kid->data);
662 ctx->cert->sig->auth_ids[1] = kid;
663 return 0;
664 }
665
666 /*
667 * Note a directoryName in an AuthorityKeyIdentifier
668 */
x509_akid_note_name(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)669 int x509_akid_note_name(void *context, size_t hdrlen,
670 unsigned char tag,
671 const void *value, size_t vlen)
672 {
673 struct x509_parse_context *ctx = context;
674
675 pr_debug("AKID: name: %*phN\n", (int)vlen, value);
676
677 ctx->akid_raw_issuer = value;
678 ctx->akid_raw_issuer_size = vlen;
679 return 0;
680 }
681
682 /*
683 * Note a serial number in an AuthorityKeyIdentifier
684 */
x509_akid_note_serial(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)685 int x509_akid_note_serial(void *context, size_t hdrlen,
686 unsigned char tag,
687 const void *value, size_t vlen)
688 {
689 struct x509_parse_context *ctx = context;
690 struct asymmetric_key_id *kid;
691
692 pr_debug("AKID: serial: %*phN\n", (int)vlen, value);
693
694 if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0])
695 return 0;
696
697 kid = asymmetric_key_generate_id(value,
698 vlen,
699 ctx->akid_raw_issuer,
700 ctx->akid_raw_issuer_size);
701 if (IS_ERR(kid))
702 return PTR_ERR(kid);
703
704 pr_debug("authkeyid %*phN\n", kid->len, kid->data);
705 ctx->cert->sig->auth_ids[0] = kid;
706 return 0;
707 }
708