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 #ifndef __UBOOT__
11 #include <linux/export.h>
12 #include <linux/slab.h>
13 #endif
14 #include <linux/err.h>
15 #include <linux/oid_registry.h>
16 #ifdef __UBOOT__
17 #include <linux/string.h>
18 #endif
19 #include <crypto/public_key.h>
20 #include "x509_parser.h"
21 #include "x509.asn1.h"
22 #include "x509_akid.asn1.h"
23
24 struct x509_parse_context {
25 struct x509_certificate *cert; /* Certificate being constructed */
26 unsigned long data; /* Start of data */
27 const void *cert_start; /* Start of cert content */
28 const void *key; /* Key data */
29 size_t key_size; /* Size of key data */
30 const void *params; /* Key parameters */
31 size_t params_size; /* Size of key parameters */
32 enum OID key_algo; /* Public key algorithm */
33 enum OID last_oid; /* Last OID encountered */
34 enum OID algo_oid; /* Algorithm OID */
35 unsigned char nr_mpi; /* Number of MPIs stored */
36 u8 o_size; /* Size of organizationName (O) */
37 u8 cn_size; /* Size of commonName (CN) */
38 u8 email_size; /* Size of emailAddress */
39 u16 o_offset; /* Offset of organizationName (O) */
40 u16 cn_offset; /* Offset of commonName (CN) */
41 u16 email_offset; /* Offset of emailAddress */
42 unsigned raw_akid_size;
43 const void *raw_akid; /* Raw authorityKeyId in ASN.1 */
44 const void *akid_raw_issuer; /* Raw directoryName in authorityKeyId */
45 unsigned akid_raw_issuer_size;
46 };
47
48 /*
49 * Free an X.509 certificate
50 */
x509_free_certificate(struct x509_certificate * cert)51 void x509_free_certificate(struct x509_certificate *cert)
52 {
53 if (cert) {
54 public_key_free(cert->pub);
55 public_key_signature_free(cert->sig);
56 kfree(cert->issuer);
57 kfree(cert->subject);
58 kfree(cert->id);
59 kfree(cert->skid);
60 kfree(cert);
61 }
62 }
63 EXPORT_SYMBOL_GPL(x509_free_certificate);
64
65 /*
66 * Parse an X.509 certificate
67 */
x509_cert_parse(const void * data,size_t datalen)68 struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
69 {
70 struct x509_certificate *cert;
71 struct x509_parse_context *ctx;
72 struct asymmetric_key_id *kid;
73 long ret;
74
75 ret = -ENOMEM;
76 cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL);
77 if (!cert)
78 goto error_no_cert;
79 cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL);
80 if (!cert->pub)
81 goto error_no_ctx;
82 cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL);
83 if (!cert->sig)
84 goto error_no_ctx;
85 ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL);
86 if (!ctx)
87 goto error_no_ctx;
88
89 ctx->cert = cert;
90 ctx->data = (unsigned long)data;
91
92 /* Attempt to decode the certificate */
93 ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen);
94 if (ret < 0)
95 goto error_decode;
96
97 /* Decode the AuthorityKeyIdentifier */
98 if (ctx->raw_akid) {
99 pr_devel("AKID: %u %*phN\n",
100 ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid);
101 ret = asn1_ber_decoder(&x509_akid_decoder, ctx,
102 ctx->raw_akid, ctx->raw_akid_size);
103 if (ret < 0) {
104 pr_warn("Couldn't decode AuthKeyIdentifier\n");
105 goto error_decode;
106 }
107 }
108
109 ret = -ENOMEM;
110 cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL);
111 if (!cert->pub->key)
112 goto error_decode;
113
114 cert->pub->keylen = ctx->key_size;
115
116 cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL);
117 if (!cert->pub->params)
118 goto error_decode;
119
120 cert->pub->paramlen = ctx->params_size;
121 cert->pub->algo = ctx->key_algo;
122
123 /* Grab the signature bits */
124 ret = x509_get_sig_params(cert);
125 if (ret < 0)
126 goto error_decode;
127
128 /* Generate cert issuer + serial number key ID */
129 kid = asymmetric_key_generate_id(cert->raw_serial,
130 cert->raw_serial_size,
131 cert->raw_issuer,
132 cert->raw_issuer_size);
133 if (IS_ERR(kid)) {
134 ret = PTR_ERR(kid);
135 goto error_decode;
136 }
137 cert->id = kid;
138
139 #ifndef __UBOOT__
140 /* Detect self-signed certificates */
141 ret = x509_check_for_self_signed(cert);
142 if (ret < 0)
143 goto error_decode;
144 #endif
145
146 kfree(ctx);
147 return cert;
148
149 error_decode:
150 kfree(ctx);
151 error_no_ctx:
152 x509_free_certificate(cert);
153 error_no_cert:
154 return ERR_PTR(ret);
155 }
156 EXPORT_SYMBOL_GPL(x509_cert_parse);
157
158 /*
159 * Note an OID when we find one for later processing when we know how
160 * to interpret it.
161 */
x509_note_OID(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)162 int x509_note_OID(void *context, size_t hdrlen,
163 unsigned char tag,
164 const void *value, size_t vlen)
165 {
166 struct x509_parse_context *ctx = context;
167
168 ctx->last_oid = look_up_OID(value, vlen);
169 if (ctx->last_oid == OID__NR) {
170 char buffer[50];
171 sprint_oid(value, vlen, buffer, sizeof(buffer));
172 pr_debug("Unknown OID: [%lu] %s\n",
173 (unsigned long)value - ctx->data, buffer);
174 }
175 return 0;
176 }
177
178 /*
179 * Save the position of the TBS data so that we can check the signature over it
180 * later.
181 */
x509_note_tbs_certificate(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)182 int x509_note_tbs_certificate(void *context, size_t hdrlen,
183 unsigned char tag,
184 const void *value, size_t vlen)
185 {
186 struct x509_parse_context *ctx = context;
187
188 pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n",
189 hdrlen, tag, (unsigned long)value - ctx->data, vlen);
190
191 ctx->cert->tbs = value - hdrlen;
192 ctx->cert->tbs_size = vlen + hdrlen;
193 return 0;
194 }
195
196 /*
197 * Record the public key algorithm
198 */
x509_note_pkey_algo(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)199 int x509_note_pkey_algo(void *context, size_t hdrlen,
200 unsigned char tag,
201 const void *value, size_t vlen)
202 {
203 struct x509_parse_context *ctx = context;
204
205 pr_debug("PubKey Algo: %u\n", ctx->last_oid);
206
207 switch (ctx->last_oid) {
208 case OID_md2WithRSAEncryption:
209 case OID_md3WithRSAEncryption:
210 default:
211 return -ENOPKG; /* Unsupported combination */
212
213 case OID_md4WithRSAEncryption:
214 ctx->cert->sig->hash_algo = "md4";
215 goto rsa_pkcs1;
216
217 case OID_sha1WithRSAEncryption:
218 ctx->cert->sig->hash_algo = "sha1";
219 goto rsa_pkcs1;
220
221 case OID_sha256WithRSAEncryption:
222 ctx->cert->sig->hash_algo = "sha256";
223 goto rsa_pkcs1;
224
225 case OID_sha384WithRSAEncryption:
226 ctx->cert->sig->hash_algo = "sha384";
227 goto rsa_pkcs1;
228
229 case OID_sha512WithRSAEncryption:
230 ctx->cert->sig->hash_algo = "sha512";
231 goto rsa_pkcs1;
232
233 case OID_sha224WithRSAEncryption:
234 ctx->cert->sig->hash_algo = "sha224";
235 goto rsa_pkcs1;
236
237 case OID_gost2012Signature256:
238 ctx->cert->sig->hash_algo = "streebog256";
239 goto ecrdsa;
240
241 case OID_gost2012Signature512:
242 ctx->cert->sig->hash_algo = "streebog512";
243 goto ecrdsa;
244 }
245
246 rsa_pkcs1:
247 ctx->cert->sig->pkey_algo = "rsa";
248 ctx->cert->sig->encoding = "pkcs1";
249 ctx->algo_oid = ctx->last_oid;
250 return 0;
251 ecrdsa:
252 ctx->cert->sig->pkey_algo = "ecrdsa";
253 ctx->cert->sig->encoding = "raw";
254 ctx->algo_oid = ctx->last_oid;
255 return 0;
256 }
257
258 /*
259 * Note the whereabouts and type of the signature.
260 */
x509_note_signature(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)261 int x509_note_signature(void *context, size_t hdrlen,
262 unsigned char tag,
263 const void *value, size_t vlen)
264 {
265 struct x509_parse_context *ctx = context;
266
267 pr_debug("Signature type: %u size %zu\n", ctx->last_oid, vlen);
268
269 if (ctx->last_oid != ctx->algo_oid) {
270 pr_warn("Got cert with pkey (%u) and sig (%u) algorithm OIDs\n",
271 ctx->algo_oid, ctx->last_oid);
272 return -EINVAL;
273 }
274
275 if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 ||
276 strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0) {
277 /* Discard the BIT STRING metadata */
278 if (vlen < 1 || *(const u8 *)value != 0)
279 return -EBADMSG;
280
281 value++;
282 vlen--;
283 }
284
285 ctx->cert->raw_sig = value;
286 ctx->cert->raw_sig_size = vlen;
287 return 0;
288 }
289
290 /*
291 * Note the certificate serial number
292 */
x509_note_serial(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)293 int x509_note_serial(void *context, size_t hdrlen,
294 unsigned char tag,
295 const void *value, size_t vlen)
296 {
297 struct x509_parse_context *ctx = context;
298 ctx->cert->raw_serial = value;
299 ctx->cert->raw_serial_size = vlen;
300 return 0;
301 }
302
303 /*
304 * Note some of the name segments from which we'll fabricate a name.
305 */
x509_extract_name_segment(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)306 int x509_extract_name_segment(void *context, size_t hdrlen,
307 unsigned char tag,
308 const void *value, size_t vlen)
309 {
310 struct x509_parse_context *ctx = context;
311
312 switch (ctx->last_oid) {
313 case OID_commonName:
314 ctx->cn_size = vlen;
315 ctx->cn_offset = (unsigned long)value - ctx->data;
316 break;
317 case OID_organizationName:
318 ctx->o_size = vlen;
319 ctx->o_offset = (unsigned long)value - ctx->data;
320 break;
321 case OID_email_address:
322 ctx->email_size = vlen;
323 ctx->email_offset = (unsigned long)value - ctx->data;
324 break;
325 default:
326 break;
327 }
328
329 return 0;
330 }
331
332 /*
333 * Fabricate and save the issuer and subject names
334 */
x509_fabricate_name(struct x509_parse_context * ctx,size_t hdrlen,unsigned char tag,char ** _name,size_t vlen)335 static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen,
336 unsigned char tag,
337 char **_name, size_t vlen)
338 {
339 const void *name, *data = (const void *)ctx->data;
340 size_t namesize;
341 char *buffer;
342
343 if (*_name)
344 return -EINVAL;
345
346 /* Empty name string if no material */
347 if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) {
348 buffer = kmalloc(1, GFP_KERNEL);
349 if (!buffer)
350 return -ENOMEM;
351 buffer[0] = 0;
352 goto done;
353 }
354
355 if (ctx->cn_size && ctx->o_size) {
356 /* Consider combining O and CN, but use only the CN if it is
357 * prefixed by the O, or a significant portion thereof.
358 */
359 namesize = ctx->cn_size;
360 name = data + ctx->cn_offset;
361 if (ctx->cn_size >= ctx->o_size &&
362 memcmp(data + ctx->cn_offset, data + ctx->o_offset,
363 ctx->o_size) == 0)
364 goto single_component;
365 if (ctx->cn_size >= 7 &&
366 ctx->o_size >= 7 &&
367 memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0)
368 goto single_component;
369
370 buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1,
371 GFP_KERNEL);
372 if (!buffer)
373 return -ENOMEM;
374
375 memcpy(buffer,
376 data + ctx->o_offset, ctx->o_size);
377 buffer[ctx->o_size + 0] = ':';
378 buffer[ctx->o_size + 1] = ' ';
379 memcpy(buffer + ctx->o_size + 2,
380 data + ctx->cn_offset, ctx->cn_size);
381 buffer[ctx->o_size + 2 + ctx->cn_size] = 0;
382 goto done;
383
384 } else if (ctx->cn_size) {
385 namesize = ctx->cn_size;
386 name = data + ctx->cn_offset;
387 } else if (ctx->o_size) {
388 namesize = ctx->o_size;
389 name = data + ctx->o_offset;
390 } else {
391 namesize = ctx->email_size;
392 name = data + ctx->email_offset;
393 }
394
395 single_component:
396 buffer = kmalloc(namesize + 1, GFP_KERNEL);
397 if (!buffer)
398 return -ENOMEM;
399 memcpy(buffer, name, namesize);
400 buffer[namesize] = 0;
401
402 done:
403 *_name = buffer;
404 ctx->cn_size = 0;
405 ctx->o_size = 0;
406 ctx->email_size = 0;
407 return 0;
408 }
409
x509_note_issuer(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)410 int x509_note_issuer(void *context, size_t hdrlen,
411 unsigned char tag,
412 const void *value, size_t vlen)
413 {
414 struct x509_parse_context *ctx = context;
415 ctx->cert->raw_issuer = value;
416 ctx->cert->raw_issuer_size = vlen;
417 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen);
418 }
419
x509_note_subject(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)420 int x509_note_subject(void *context, size_t hdrlen,
421 unsigned char tag,
422 const void *value, size_t vlen)
423 {
424 struct x509_parse_context *ctx = context;
425 ctx->cert->raw_subject = value;
426 ctx->cert->raw_subject_size = vlen;
427 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen);
428 }
429
430 /*
431 * Extract the parameters for the public key
432 */
x509_note_params(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)433 int x509_note_params(void *context, size_t hdrlen,
434 unsigned char tag,
435 const void *value, size_t vlen)
436 {
437 struct x509_parse_context *ctx = context;
438
439 /*
440 * AlgorithmIdentifier is used three times in the x509, we should skip
441 * first and ignore third, using second one which is after subject and
442 * before subjectPublicKey.
443 */
444 if (!ctx->cert->raw_subject || ctx->key)
445 return 0;
446 ctx->params = value - hdrlen;
447 ctx->params_size = vlen + hdrlen;
448 return 0;
449 }
450
451 /*
452 * Extract the data for the public key algorithm
453 */
x509_extract_key_data(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)454 int x509_extract_key_data(void *context, size_t hdrlen,
455 unsigned char tag,
456 const void *value, size_t vlen)
457 {
458 struct x509_parse_context *ctx = context;
459
460 ctx->key_algo = ctx->last_oid;
461 if (ctx->last_oid == OID_rsaEncryption)
462 ctx->cert->pub->pkey_algo = "rsa";
463 else if (ctx->last_oid == OID_gost2012PKey256 ||
464 ctx->last_oid == OID_gost2012PKey512)
465 ctx->cert->pub->pkey_algo = "ecrdsa";
466 else
467 return -ENOPKG;
468
469 /* Discard the BIT STRING metadata */
470 if (vlen < 1 || *(const u8 *)value != 0)
471 return -EBADMSG;
472 ctx->key = value + 1;
473 ctx->key_size = vlen - 1;
474 return 0;
475 }
476
477 /* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */
478 #define SEQ_TAG_KEYID (ASN1_CONT << 6)
479
480 /*
481 * Process certificate extensions that are used to qualify the certificate.
482 */
x509_process_extension(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)483 int x509_process_extension(void *context, size_t hdrlen,
484 unsigned char tag,
485 const void *value, size_t vlen)
486 {
487 struct x509_parse_context *ctx = context;
488 struct asymmetric_key_id *kid;
489 const unsigned char *v = value;
490
491 pr_debug("Extension: %u\n", ctx->last_oid);
492
493 if (ctx->last_oid == OID_subjectKeyIdentifier) {
494 /* Get hold of the key fingerprint */
495 if (ctx->cert->skid || vlen < 3)
496 return -EBADMSG;
497 if (v[0] != ASN1_OTS || v[1] != vlen - 2)
498 return -EBADMSG;
499 v += 2;
500 vlen -= 2;
501
502 ctx->cert->raw_skid_size = vlen;
503 ctx->cert->raw_skid = v;
504 kid = asymmetric_key_generate_id(v, vlen, "", 0);
505 if (IS_ERR(kid))
506 return PTR_ERR(kid);
507 ctx->cert->skid = kid;
508 pr_debug("subjkeyid %*phN\n", kid->len, kid->data);
509 return 0;
510 }
511
512 if (ctx->last_oid == OID_authorityKeyIdentifier) {
513 /* Get hold of the CA key fingerprint */
514 ctx->raw_akid = v;
515 ctx->raw_akid_size = vlen;
516 return 0;
517 }
518
519 return 0;
520 }
521
522 /**
523 * x509_decode_time - Decode an X.509 time ASN.1 object
524 * @_t: The time to fill in
525 * @hdrlen: The length of the object header
526 * @tag: The object tag
527 * @value: The object value
528 * @vlen: The size of the object value
529 *
530 * Decode an ASN.1 universal time or generalised time field into a struct the
531 * kernel can handle and check it for validity. The time is decoded thus:
532 *
533 * [RFC5280 §4.1.2.5]
534 * CAs conforming to this profile MUST always encode certificate validity
535 * dates through the year 2049 as UTCTime; certificate validity dates in
536 * 2050 or later MUST be encoded as GeneralizedTime. Conforming
537 * applications MUST be able to process validity dates that are encoded in
538 * either UTCTime or GeneralizedTime.
539 */
x509_decode_time(time64_t * _t,size_t hdrlen,unsigned char tag,const unsigned char * value,size_t vlen)540 int x509_decode_time(time64_t *_t, size_t hdrlen,
541 unsigned char tag,
542 const unsigned char *value, size_t vlen)
543 {
544 static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30,
545 31, 31, 30, 31, 30, 31 };
546 const unsigned char *p = value;
547 unsigned year, mon, day, hour, min, sec, mon_len;
548
549 #define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; })
550 #define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; })
551
552 if (tag == ASN1_UNITIM) {
553 /* UTCTime: YYMMDDHHMMSSZ */
554 if (vlen != 13)
555 goto unsupported_time;
556 year = DD2bin(p);
557 if (year >= 50)
558 year += 1900;
559 else
560 year += 2000;
561 } else if (tag == ASN1_GENTIM) {
562 /* GenTime: YYYYMMDDHHMMSSZ */
563 if (vlen != 15)
564 goto unsupported_time;
565 year = DD2bin(p) * 100 + DD2bin(p);
566 if (year >= 1950 && year <= 2049)
567 goto invalid_time;
568 } else {
569 goto unsupported_time;
570 }
571
572 mon = DD2bin(p);
573 day = DD2bin(p);
574 hour = DD2bin(p);
575 min = DD2bin(p);
576 sec = DD2bin(p);
577
578 if (*p != 'Z')
579 goto unsupported_time;
580
581 if (year < 1970 ||
582 mon < 1 || mon > 12)
583 goto invalid_time;
584
585 mon_len = month_lengths[mon - 1];
586 if (mon == 2) {
587 if (year % 4 == 0) {
588 mon_len = 29;
589 if (year % 100 == 0) {
590 mon_len = 28;
591 if (year % 400 == 0)
592 mon_len = 29;
593 }
594 }
595 }
596
597 if (day < 1 || day > mon_len ||
598 hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */
599 min > 59 ||
600 sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */
601 goto invalid_time;
602
603 *_t = mktime64(year, mon, day, hour, min, sec);
604 return 0;
605
606 unsupported_time:
607 pr_debug("Got unsupported time [tag %02x]: '%*phN'\n",
608 tag, (int)vlen, value);
609 return -EBADMSG;
610 invalid_time:
611 pr_debug("Got invalid time [tag %02x]: '%*phN'\n",
612 tag, (int)vlen, value);
613 return -EBADMSG;
614 }
615 EXPORT_SYMBOL_GPL(x509_decode_time);
616
x509_note_not_before(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)617 int x509_note_not_before(void *context, size_t hdrlen,
618 unsigned char tag,
619 const void *value, size_t vlen)
620 {
621 struct x509_parse_context *ctx = context;
622 return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen);
623 }
624
x509_note_not_after(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)625 int x509_note_not_after(void *context, size_t hdrlen,
626 unsigned char tag,
627 const void *value, size_t vlen)
628 {
629 struct x509_parse_context *ctx = context;
630 return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen);
631 }
632
633 /*
634 * Note a key identifier-based AuthorityKeyIdentifier
635 */
x509_akid_note_kid(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)636 int x509_akid_note_kid(void *context, size_t hdrlen,
637 unsigned char tag,
638 const void *value, size_t vlen)
639 {
640 struct x509_parse_context *ctx = context;
641 struct asymmetric_key_id *kid;
642
643 pr_debug("AKID: keyid: %*phN\n", (int)vlen, value);
644
645 if (ctx->cert->sig->auth_ids[1])
646 return 0;
647
648 kid = asymmetric_key_generate_id(value, vlen, "", 0);
649 if (IS_ERR(kid))
650 return PTR_ERR(kid);
651 pr_debug("authkeyid %*phN\n", kid->len, kid->data);
652 ctx->cert->sig->auth_ids[1] = kid;
653 return 0;
654 }
655
656 /*
657 * Note a directoryName in an AuthorityKeyIdentifier
658 */
x509_akid_note_name(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)659 int x509_akid_note_name(void *context, size_t hdrlen,
660 unsigned char tag,
661 const void *value, size_t vlen)
662 {
663 struct x509_parse_context *ctx = context;
664
665 pr_debug("AKID: name: %*phN\n", (int)vlen, value);
666
667 ctx->akid_raw_issuer = value;
668 ctx->akid_raw_issuer_size = vlen;
669 return 0;
670 }
671
672 /*
673 * Note a serial number in an AuthorityKeyIdentifier
674 */
x509_akid_note_serial(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)675 int x509_akid_note_serial(void *context, size_t hdrlen,
676 unsigned char tag,
677 const void *value, size_t vlen)
678 {
679 struct x509_parse_context *ctx = context;
680 struct asymmetric_key_id *kid;
681
682 pr_debug("AKID: serial: %*phN\n", (int)vlen, value);
683
684 if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0])
685 return 0;
686
687 kid = asymmetric_key_generate_id(value,
688 vlen,
689 ctx->akid_raw_issuer,
690 ctx->akid_raw_issuer_size);
691 if (IS_ERR(kid))
692 return PTR_ERR(kid);
693
694 pr_debug("authkeyid %*phN\n", kid->len, kid->data);
695 ctx->cert->sig->auth_ids[0] = kid;
696 return 0;
697 }
698