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 <log.h>
10 #include <dm/devres.h>
11 #include <linux/kernel.h>
12 #ifndef __UBOOT__
13 #include <linux/export.h>
14 #include <linux/slab.h>
15 #endif
16 #include <linux/err.h>
17 #include <linux/oid_registry.h>
18 #ifdef __UBOOT__
19 #include <linux/printk.h>
20 #include <linux/string.h>
21 #endif
22 #include <crypto/public_key.h>
23 #ifdef __UBOOT__
24 #include <crypto/x509_parser.h>
25 #else
26 #include "x509_parser.h"
27 #endif
28 #include "x509.asn1.h"
29 #include "x509_akid.asn1.h"
30
31 struct x509_parse_context {
32 struct x509_certificate *cert; /* Certificate being constructed */
33 unsigned long data; /* Start of data */
34 const void *cert_start; /* Start of cert content */
35 const void *key; /* Key data */
36 size_t key_size; /* Size of key data */
37 const void *params; /* Key parameters */
38 size_t params_size; /* Size of key parameters */
39 enum OID key_algo; /* Public key algorithm */
40 enum OID last_oid; /* Last OID encountered */
41 enum OID algo_oid; /* Algorithm OID */
42 unsigned char nr_mpi; /* Number of MPIs stored */
43 u8 o_size; /* Size of organizationName (O) */
44 u8 cn_size; /* Size of commonName (CN) */
45 u8 email_size; /* Size of emailAddress */
46 u16 o_offset; /* Offset of organizationName (O) */
47 u16 cn_offset; /* Offset of commonName (CN) */
48 u16 email_offset; /* Offset of emailAddress */
49 unsigned raw_akid_size;
50 const void *raw_akid; /* Raw authorityKeyId in ASN.1 */
51 const void *akid_raw_issuer; /* Raw directoryName in authorityKeyId */
52 unsigned akid_raw_issuer_size;
53 };
54
55 /*
56 * Free an X.509 certificate
57 */
x509_free_certificate(struct x509_certificate * cert)58 void x509_free_certificate(struct x509_certificate *cert)
59 {
60 if (cert) {
61 public_key_free(cert->pub);
62 public_key_signature_free(cert->sig);
63 kfree(cert->issuer);
64 kfree(cert->subject);
65 kfree(cert->id);
66 kfree(cert->skid);
67 kfree(cert);
68 }
69 }
70 EXPORT_SYMBOL_GPL(x509_free_certificate);
71
72 /*
73 * Parse an X.509 certificate
74 */
x509_cert_parse(const void * data,size_t datalen)75 struct x509_certificate *x509_cert_parse(const void *data, size_t datalen)
76 {
77 struct x509_certificate *cert;
78 struct x509_parse_context *ctx;
79 struct asymmetric_key_id *kid;
80 long ret;
81
82 ret = -ENOMEM;
83 cert = kzalloc(sizeof(struct x509_certificate), GFP_KERNEL);
84 if (!cert)
85 goto error_no_cert;
86 cert->pub = kzalloc(sizeof(struct public_key), GFP_KERNEL);
87 if (!cert->pub)
88 goto error_no_ctx;
89 cert->sig = kzalloc(sizeof(struct public_key_signature), GFP_KERNEL);
90 if (!cert->sig)
91 goto error_no_ctx;
92 ctx = kzalloc(sizeof(struct x509_parse_context), GFP_KERNEL);
93 if (!ctx)
94 goto error_no_ctx;
95
96 ctx->cert = cert;
97 ctx->data = (unsigned long)data;
98
99 /* Attempt to decode the certificate */
100 ret = asn1_ber_decoder(&x509_decoder, ctx, data, datalen);
101 if (ret < 0)
102 goto error_decode;
103
104 /* Decode the AuthorityKeyIdentifier */
105 if (ctx->raw_akid) {
106 pr_devel("AKID: %u %*phN\n",
107 ctx->raw_akid_size, ctx->raw_akid_size, ctx->raw_akid);
108 ret = asn1_ber_decoder(&x509_akid_decoder, ctx,
109 ctx->raw_akid, ctx->raw_akid_size);
110 if (ret < 0) {
111 pr_warn("Couldn't decode AuthKeyIdentifier\n");
112 goto error_decode;
113 }
114 }
115
116 ret = -ENOMEM;
117 cert->pub->key = kmemdup(ctx->key, ctx->key_size, GFP_KERNEL);
118 if (!cert->pub->key)
119 goto error_decode;
120
121 cert->pub->keylen = ctx->key_size;
122
123 cert->pub->params = kmemdup(ctx->params, ctx->params_size, GFP_KERNEL);
124 if (!cert->pub->params)
125 goto error_decode;
126
127 cert->pub->paramlen = ctx->params_size;
128 cert->pub->algo = ctx->key_algo;
129
130 /* Grab the signature bits */
131 ret = x509_get_sig_params(cert);
132 if (ret < 0)
133 goto error_decode;
134
135 /* Generate cert issuer + serial number key ID */
136 kid = asymmetric_key_generate_id(cert->raw_serial,
137 cert->raw_serial_size,
138 cert->raw_issuer,
139 cert->raw_issuer_size);
140 if (IS_ERR(kid)) {
141 ret = PTR_ERR(kid);
142 goto error_decode;
143 }
144 cert->id = kid;
145
146 /* Detect self-signed certificates */
147 ret = x509_check_for_self_signed(cert);
148 if (ret < 0)
149 goto error_decode;
150
151 kfree(ctx);
152 return cert;
153
154 error_decode:
155 kfree(ctx);
156 error_no_ctx:
157 x509_free_certificate(cert);
158 error_no_cert:
159 return ERR_PTR(ret);
160 }
161 EXPORT_SYMBOL_GPL(x509_cert_parse);
162
163 /*
164 * Note an OID when we find one for later processing when we know how
165 * to interpret it.
166 */
x509_note_OID(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)167 int x509_note_OID(void *context, size_t hdrlen,
168 unsigned char tag,
169 const void *value, size_t vlen)
170 {
171 struct x509_parse_context *ctx = context;
172
173 ctx->last_oid = look_up_OID(value, vlen);
174 if (ctx->last_oid == OID__NR) {
175 char buffer[50];
176 sprint_oid(value, vlen, buffer, sizeof(buffer));
177 pr_debug("Unknown OID: [%lu] %s\n",
178 (unsigned long)value - ctx->data, buffer);
179 }
180 return 0;
181 }
182
183 /*
184 * Save the position of the TBS data so that we can check the signature over it
185 * later.
186 */
x509_note_tbs_certificate(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)187 int x509_note_tbs_certificate(void *context, size_t hdrlen,
188 unsigned char tag,
189 const void *value, size_t vlen)
190 {
191 struct x509_parse_context *ctx = context;
192
193 pr_debug("x509_note_tbs_certificate(,%zu,%02x,%ld,%zu)!\n",
194 hdrlen, tag, (unsigned long)value - ctx->data, vlen);
195
196 ctx->cert->tbs = value - hdrlen;
197 ctx->cert->tbs_size = vlen + hdrlen;
198 return 0;
199 }
200
201 /*
202 * Record the public key algorithm
203 */
x509_note_pkey_algo(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)204 int x509_note_pkey_algo(void *context, size_t hdrlen,
205 unsigned char tag,
206 const void *value, size_t vlen)
207 {
208 struct x509_parse_context *ctx = context;
209
210 pr_debug("PubKey Algo: %u\n", ctx->last_oid);
211
212 switch (ctx->last_oid) {
213 case OID_md2WithRSAEncryption:
214 case OID_md3WithRSAEncryption:
215 default:
216 return -ENOPKG; /* Unsupported combination */
217
218 case OID_md4WithRSAEncryption:
219 ctx->cert->sig->hash_algo = "md4";
220 goto rsa_pkcs1;
221
222 case OID_sha1WithRSAEncryption:
223 ctx->cert->sig->hash_algo = "sha1";
224 goto rsa_pkcs1;
225
226 case OID_sha256WithRSAEncryption:
227 ctx->cert->sig->hash_algo = "sha256";
228 goto rsa_pkcs1;
229
230 case OID_sha384WithRSAEncryption:
231 ctx->cert->sig->hash_algo = "sha384";
232 goto rsa_pkcs1;
233
234 case OID_sha512WithRSAEncryption:
235 ctx->cert->sig->hash_algo = "sha512";
236 goto rsa_pkcs1;
237
238 case OID_sha224WithRSAEncryption:
239 ctx->cert->sig->hash_algo = "sha224";
240 goto rsa_pkcs1;
241
242 case OID_gost2012Signature256:
243 ctx->cert->sig->hash_algo = "streebog256";
244 goto ecrdsa;
245
246 case OID_gost2012Signature512:
247 ctx->cert->sig->hash_algo = "streebog512";
248 goto ecrdsa;
249 }
250
251 rsa_pkcs1:
252 ctx->cert->sig->pkey_algo = "rsa";
253 ctx->cert->sig->encoding = "pkcs1";
254 ctx->algo_oid = ctx->last_oid;
255 return 0;
256 ecrdsa:
257 ctx->cert->sig->pkey_algo = "ecrdsa";
258 ctx->cert->sig->encoding = "raw";
259 ctx->algo_oid = ctx->last_oid;
260 return 0;
261 }
262
263 /*
264 * Note the whereabouts and type of the signature.
265 */
x509_note_signature(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)266 int x509_note_signature(void *context, size_t hdrlen,
267 unsigned char tag,
268 const void *value, size_t vlen)
269 {
270 struct x509_parse_context *ctx = context;
271
272 pr_debug("Signature type: %u size %zu\n", ctx->last_oid, vlen);
273
274 if (ctx->last_oid != ctx->algo_oid) {
275 pr_warn("Got cert with pkey (%u) and sig (%u) algorithm OIDs\n",
276 ctx->algo_oid, ctx->last_oid);
277 return -EINVAL;
278 }
279
280 if (strcmp(ctx->cert->sig->pkey_algo, "rsa") == 0 ||
281 strcmp(ctx->cert->sig->pkey_algo, "ecrdsa") == 0) {
282 /* Discard the BIT STRING metadata */
283 if (vlen < 1 || *(const u8 *)value != 0)
284 return -EBADMSG;
285
286 value++;
287 vlen--;
288 }
289
290 ctx->cert->raw_sig = value;
291 ctx->cert->raw_sig_size = vlen;
292 return 0;
293 }
294
295 /*
296 * Note the certificate serial number
297 */
x509_note_serial(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)298 int x509_note_serial(void *context, size_t hdrlen,
299 unsigned char tag,
300 const void *value, size_t vlen)
301 {
302 struct x509_parse_context *ctx = context;
303 ctx->cert->raw_serial = value;
304 ctx->cert->raw_serial_size = vlen;
305 return 0;
306 }
307
308 /*
309 * Note some of the name segments from which we'll fabricate a name.
310 */
x509_extract_name_segment(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)311 int x509_extract_name_segment(void *context, size_t hdrlen,
312 unsigned char tag,
313 const void *value, size_t vlen)
314 {
315 struct x509_parse_context *ctx = context;
316
317 switch (ctx->last_oid) {
318 case OID_commonName:
319 ctx->cn_size = vlen;
320 ctx->cn_offset = (unsigned long)value - ctx->data;
321 break;
322 case OID_organizationName:
323 ctx->o_size = vlen;
324 ctx->o_offset = (unsigned long)value - ctx->data;
325 break;
326 case OID_email_address:
327 ctx->email_size = vlen;
328 ctx->email_offset = (unsigned long)value - ctx->data;
329 break;
330 default:
331 break;
332 }
333
334 return 0;
335 }
336
337 /*
338 * Fabricate and save the issuer and subject names
339 */
x509_fabricate_name(struct x509_parse_context * ctx,size_t hdrlen,unsigned char tag,char ** _name,size_t vlen)340 static int x509_fabricate_name(struct x509_parse_context *ctx, size_t hdrlen,
341 unsigned char tag,
342 char **_name, size_t vlen)
343 {
344 const void *name, *data = (const void *)ctx->data;
345 size_t namesize;
346 char *buffer;
347
348 if (*_name)
349 return -EINVAL;
350
351 /* Empty name string if no material */
352 if (!ctx->cn_size && !ctx->o_size && !ctx->email_size) {
353 buffer = kmalloc(1, GFP_KERNEL);
354 if (!buffer)
355 return -ENOMEM;
356 buffer[0] = 0;
357 goto done;
358 }
359
360 if (ctx->cn_size && ctx->o_size) {
361 /* Consider combining O and CN, but use only the CN if it is
362 * prefixed by the O, or a significant portion thereof.
363 */
364 namesize = ctx->cn_size;
365 name = data + ctx->cn_offset;
366 if (ctx->cn_size >= ctx->o_size &&
367 memcmp(data + ctx->cn_offset, data + ctx->o_offset,
368 ctx->o_size) == 0)
369 goto single_component;
370 if (ctx->cn_size >= 7 &&
371 ctx->o_size >= 7 &&
372 memcmp(data + ctx->cn_offset, data + ctx->o_offset, 7) == 0)
373 goto single_component;
374
375 buffer = kmalloc(ctx->o_size + 2 + ctx->cn_size + 1,
376 GFP_KERNEL);
377 if (!buffer)
378 return -ENOMEM;
379
380 memcpy(buffer,
381 data + ctx->o_offset, ctx->o_size);
382 buffer[ctx->o_size + 0] = ':';
383 buffer[ctx->o_size + 1] = ' ';
384 memcpy(buffer + ctx->o_size + 2,
385 data + ctx->cn_offset, ctx->cn_size);
386 buffer[ctx->o_size + 2 + ctx->cn_size] = 0;
387 goto done;
388
389 } else if (ctx->cn_size) {
390 namesize = ctx->cn_size;
391 name = data + ctx->cn_offset;
392 } else if (ctx->o_size) {
393 namesize = ctx->o_size;
394 name = data + ctx->o_offset;
395 } else {
396 namesize = ctx->email_size;
397 name = data + ctx->email_offset;
398 }
399
400 single_component:
401 buffer = kmalloc(namesize + 1, GFP_KERNEL);
402 if (!buffer)
403 return -ENOMEM;
404 memcpy(buffer, name, namesize);
405 buffer[namesize] = 0;
406
407 done:
408 *_name = buffer;
409 ctx->cn_size = 0;
410 ctx->o_size = 0;
411 ctx->email_size = 0;
412 return 0;
413 }
414
x509_note_issuer(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)415 int x509_note_issuer(void *context, size_t hdrlen,
416 unsigned char tag,
417 const void *value, size_t vlen)
418 {
419 struct x509_parse_context *ctx = context;
420 ctx->cert->raw_issuer = value;
421 ctx->cert->raw_issuer_size = vlen;
422 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->issuer, vlen);
423 }
424
x509_note_subject(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)425 int x509_note_subject(void *context, size_t hdrlen,
426 unsigned char tag,
427 const void *value, size_t vlen)
428 {
429 struct x509_parse_context *ctx = context;
430 ctx->cert->raw_subject = value;
431 ctx->cert->raw_subject_size = vlen;
432 return x509_fabricate_name(ctx, hdrlen, tag, &ctx->cert->subject, vlen);
433 }
434
435 /*
436 * Extract the parameters for the public key
437 */
x509_note_params(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)438 int x509_note_params(void *context, size_t hdrlen,
439 unsigned char tag,
440 const void *value, size_t vlen)
441 {
442 struct x509_parse_context *ctx = context;
443
444 /*
445 * AlgorithmIdentifier is used three times in the x509, we should skip
446 * first and ignore third, using second one which is after subject and
447 * before subjectPublicKey.
448 */
449 if (!ctx->cert->raw_subject || ctx->key)
450 return 0;
451 ctx->params = value - hdrlen;
452 ctx->params_size = vlen + hdrlen;
453 return 0;
454 }
455
456 /*
457 * Extract the data for the public key algorithm
458 */
x509_extract_key_data(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)459 int x509_extract_key_data(void *context, size_t hdrlen,
460 unsigned char tag,
461 const void *value, size_t vlen)
462 {
463 struct x509_parse_context *ctx = context;
464
465 ctx->key_algo = ctx->last_oid;
466 if (ctx->last_oid == OID_rsaEncryption)
467 ctx->cert->pub->pkey_algo = "rsa";
468 else if (ctx->last_oid == OID_gost2012PKey256 ||
469 ctx->last_oid == OID_gost2012PKey512)
470 ctx->cert->pub->pkey_algo = "ecrdsa";
471 else
472 return -ENOPKG;
473
474 /* Discard the BIT STRING metadata */
475 if (vlen < 1 || *(const u8 *)value != 0)
476 return -EBADMSG;
477 ctx->key = value + 1;
478 ctx->key_size = vlen - 1;
479 return 0;
480 }
481
482 /* The keyIdentifier in AuthorityKeyIdentifier SEQUENCE is tag(CONT,PRIM,0) */
483 #define SEQ_TAG_KEYID (ASN1_CONT << 6)
484
485 /*
486 * Process certificate extensions that are used to qualify the certificate.
487 */
x509_process_extension(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)488 int x509_process_extension(void *context, size_t hdrlen,
489 unsigned char tag,
490 const void *value, size_t vlen)
491 {
492 struct x509_parse_context *ctx = context;
493 struct asymmetric_key_id *kid;
494 const unsigned char *v = value;
495
496 pr_debug("Extension: %u\n", ctx->last_oid);
497
498 if (ctx->last_oid == OID_subjectKeyIdentifier) {
499 /* Get hold of the key fingerprint */
500 if (ctx->cert->skid || vlen < 3)
501 return -EBADMSG;
502 if (v[0] != ASN1_OTS || v[1] != vlen - 2)
503 return -EBADMSG;
504 v += 2;
505 vlen -= 2;
506
507 ctx->cert->raw_skid_size = vlen;
508 ctx->cert->raw_skid = v;
509 kid = asymmetric_key_generate_id(v, vlen, "", 0);
510 if (IS_ERR(kid))
511 return PTR_ERR(kid);
512 ctx->cert->skid = kid;
513 pr_debug("subjkeyid %*phN\n", kid->len, kid->data);
514 return 0;
515 }
516
517 if (ctx->last_oid == OID_authorityKeyIdentifier) {
518 /* Get hold of the CA key fingerprint */
519 ctx->raw_akid = v;
520 ctx->raw_akid_size = vlen;
521 return 0;
522 }
523
524 return 0;
525 }
526
527 /**
528 * x509_decode_time - Decode an X.509 time ASN.1 object
529 * @_t: The time to fill in
530 * @hdrlen: The length of the object header
531 * @tag: The object tag
532 * @value: The object value
533 * @vlen: The size of the object value
534 *
535 * Decode an ASN.1 universal time or generalised time field into a struct the
536 * kernel can handle and check it for validity. The time is decoded thus:
537 *
538 * [RFC5280 paragraph 74.1.2.5]
539 * CAs conforming to this profile MUST always encode certificate validity
540 * dates through the year 2049 as UTCTime; certificate validity dates in
541 * 2050 or later MUST be encoded as GeneralizedTime. Conforming
542 * applications MUST be able to process validity dates that are encoded in
543 * either UTCTime or GeneralizedTime.
544 */
x509_decode_time(time64_t * _t,size_t hdrlen,unsigned char tag,const unsigned char * value,size_t vlen)545 int x509_decode_time(time64_t *_t, size_t hdrlen,
546 unsigned char tag,
547 const unsigned char *value, size_t vlen)
548 {
549 static const unsigned char month_lengths[] = { 31, 28, 31, 30, 31, 30,
550 31, 31, 30, 31, 30, 31 };
551 const unsigned char *p = value;
552 unsigned year, mon, day, hour, min, sec, mon_len;
553
554 #define dec2bin(X) ({ unsigned char x = (X) - '0'; if (x > 9) goto invalid_time; x; })
555 #define DD2bin(P) ({ unsigned x = dec2bin(P[0]) * 10 + dec2bin(P[1]); P += 2; x; })
556
557 if (tag == ASN1_UNITIM) {
558 /* UTCTime: YYMMDDHHMMSSZ */
559 if (vlen != 13)
560 goto unsupported_time;
561 year = DD2bin(p);
562 if (year >= 50)
563 year += 1900;
564 else
565 year += 2000;
566 } else if (tag == ASN1_GENTIM) {
567 /* GenTime: YYYYMMDDHHMMSSZ */
568 if (vlen != 15)
569 goto unsupported_time;
570 year = DD2bin(p) * 100 + DD2bin(p);
571 if (year >= 1950 && year <= 2049)
572 goto invalid_time;
573 } else {
574 goto unsupported_time;
575 }
576
577 mon = DD2bin(p);
578 day = DD2bin(p);
579 hour = DD2bin(p);
580 min = DD2bin(p);
581 sec = DD2bin(p);
582
583 if (*p != 'Z')
584 goto unsupported_time;
585
586 if (year < 1970 ||
587 mon < 1 || mon > 12)
588 goto invalid_time;
589
590 mon_len = month_lengths[mon - 1];
591 if (mon == 2) {
592 if (year % 4 == 0) {
593 mon_len = 29;
594 if (year % 100 == 0) {
595 mon_len = 28;
596 if (year % 400 == 0)
597 mon_len = 29;
598 }
599 }
600 }
601
602 if (day < 1 || day > mon_len ||
603 hour > 24 || /* ISO 8601 permits 24:00:00 as midnight tomorrow */
604 min > 59 ||
605 sec > 60) /* ISO 8601 permits leap seconds [X.680 46.3] */
606 goto invalid_time;
607
608 *_t = mktime64(year, mon, day, hour, min, sec);
609 return 0;
610
611 unsupported_time:
612 pr_debug("Got unsupported time [tag %02x]: '%*phN'\n",
613 tag, (int)vlen, value);
614 return -EBADMSG;
615 invalid_time:
616 pr_debug("Got invalid time [tag %02x]: '%*phN'\n",
617 tag, (int)vlen, value);
618 return -EBADMSG;
619 }
620 EXPORT_SYMBOL_GPL(x509_decode_time);
621
x509_note_not_before(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)622 int x509_note_not_before(void *context, size_t hdrlen,
623 unsigned char tag,
624 const void *value, size_t vlen)
625 {
626 struct x509_parse_context *ctx = context;
627 return x509_decode_time(&ctx->cert->valid_from, hdrlen, tag, value, vlen);
628 }
629
x509_note_not_after(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)630 int x509_note_not_after(void *context, size_t hdrlen,
631 unsigned char tag,
632 const void *value, size_t vlen)
633 {
634 struct x509_parse_context *ctx = context;
635 return x509_decode_time(&ctx->cert->valid_to, hdrlen, tag, value, vlen);
636 }
637
638 /*
639 * Note a key identifier-based AuthorityKeyIdentifier
640 */
x509_akid_note_kid(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)641 int x509_akid_note_kid(void *context, size_t hdrlen,
642 unsigned char tag,
643 const void *value, size_t vlen)
644 {
645 struct x509_parse_context *ctx = context;
646 struct asymmetric_key_id *kid;
647
648 pr_debug("AKID: keyid: %*phN\n", (int)vlen, value);
649
650 if (ctx->cert->sig->auth_ids[1])
651 return 0;
652
653 kid = asymmetric_key_generate_id(value, vlen, "", 0);
654 if (IS_ERR(kid))
655 return PTR_ERR(kid);
656 pr_debug("authkeyid %*phN\n", kid->len, kid->data);
657 ctx->cert->sig->auth_ids[1] = kid;
658 return 0;
659 }
660
661 /*
662 * Note a directoryName in an AuthorityKeyIdentifier
663 */
x509_akid_note_name(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)664 int x509_akid_note_name(void *context, size_t hdrlen,
665 unsigned char tag,
666 const void *value, size_t vlen)
667 {
668 struct x509_parse_context *ctx = context;
669
670 pr_debug("AKID: name: %*phN\n", (int)vlen, value);
671
672 ctx->akid_raw_issuer = value;
673 ctx->akid_raw_issuer_size = vlen;
674 return 0;
675 }
676
677 /*
678 * Note a serial number in an AuthorityKeyIdentifier
679 */
x509_akid_note_serial(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)680 int x509_akid_note_serial(void *context, size_t hdrlen,
681 unsigned char tag,
682 const void *value, size_t vlen)
683 {
684 struct x509_parse_context *ctx = context;
685 struct asymmetric_key_id *kid;
686
687 pr_debug("AKID: serial: %*phN\n", (int)vlen, value);
688
689 if (!ctx->akid_raw_issuer || ctx->cert->sig->auth_ids[0])
690 return 0;
691
692 kid = asymmetric_key_generate_id(value,
693 vlen,
694 ctx->akid_raw_issuer,
695 ctx->akid_raw_issuer_size);
696 if (IS_ERR(kid))
697 return PTR_ERR(kid);
698
699 pr_debug("authkeyid %*phN\n", kid->len, kid->data);
700 ctx->cert->sig->auth_ids[0] = kid;
701 return 0;
702 }
703