1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* PKCS#7 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) "PKCS7: "fmt
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/export.h>
12 #include <linux/slab.h>
13 #include <linux/err.h>
14 #include <linux/oid_registry.h>
15 #include <crypto/public_key.h>
16 #include "pkcs7_parser.h"
17 #include "pkcs7.asn1.h"
18 
19 MODULE_DESCRIPTION("PKCS#7 parser");
20 MODULE_AUTHOR("Red Hat, Inc.");
21 MODULE_LICENSE("GPL");
22 
23 struct pkcs7_parse_context {
24 	struct pkcs7_message	*msg;		/* Message being constructed */
25 	struct pkcs7_signed_info *sinfo;	/* SignedInfo being constructed */
26 	struct pkcs7_signed_info **ppsinfo;
27 	struct x509_certificate *certs;		/* Certificate cache */
28 	struct x509_certificate **ppcerts;
29 	unsigned long	data;			/* Start of data */
30 	enum OID	last_oid;		/* Last OID encountered */
31 	unsigned	x509_index;
32 	unsigned	sinfo_index;
33 	const void	*raw_serial;
34 	unsigned	raw_serial_size;
35 	unsigned	raw_issuer_size;
36 	const void	*raw_issuer;
37 	const void	*raw_skid;
38 	unsigned	raw_skid_size;
39 	bool		expect_skid;
40 };
41 
42 /*
43  * Free a signed information block.
44  */
pkcs7_free_signed_info(struct pkcs7_signed_info * sinfo)45 static void pkcs7_free_signed_info(struct pkcs7_signed_info *sinfo)
46 {
47 	if (sinfo) {
48 		public_key_signature_free(sinfo->sig);
49 		kfree(sinfo);
50 	}
51 }
52 
53 /**
54  * pkcs7_free_message - Free a PKCS#7 message
55  * @pkcs7: The PKCS#7 message to free
56  */
pkcs7_free_message(struct pkcs7_message * pkcs7)57 void pkcs7_free_message(struct pkcs7_message *pkcs7)
58 {
59 	struct x509_certificate *cert;
60 	struct pkcs7_signed_info *sinfo;
61 
62 	if (pkcs7) {
63 		while (pkcs7->certs) {
64 			cert = pkcs7->certs;
65 			pkcs7->certs = cert->next;
66 			x509_free_certificate(cert);
67 		}
68 		while (pkcs7->crl) {
69 			cert = pkcs7->crl;
70 			pkcs7->crl = cert->next;
71 			x509_free_certificate(cert);
72 		}
73 		while (pkcs7->signed_infos) {
74 			sinfo = pkcs7->signed_infos;
75 			pkcs7->signed_infos = sinfo->next;
76 			pkcs7_free_signed_info(sinfo);
77 		}
78 		kfree(pkcs7);
79 	}
80 }
81 EXPORT_SYMBOL_GPL(pkcs7_free_message);
82 
83 /*
84  * Check authenticatedAttributes are provided or not provided consistently.
85  */
pkcs7_check_authattrs(struct pkcs7_message * msg)86 static int pkcs7_check_authattrs(struct pkcs7_message *msg)
87 {
88 	struct pkcs7_signed_info *sinfo;
89 	bool want = false;
90 
91 	sinfo = msg->signed_infos;
92 	if (!sinfo)
93 		goto inconsistent;
94 
95 	if (sinfo->authattrs) {
96 		want = true;
97 		msg->have_authattrs = true;
98 	}
99 
100 	for (sinfo = sinfo->next; sinfo; sinfo = sinfo->next)
101 		if (!!sinfo->authattrs != want)
102 			goto inconsistent;
103 	return 0;
104 
105 inconsistent:
106 	pr_warn("Inconsistently supplied authAttrs\n");
107 	return -EINVAL;
108 }
109 
110 /**
111  * pkcs7_parse_message - Parse a PKCS#7 message
112  * @data: The raw binary ASN.1 encoded message to be parsed
113  * @datalen: The size of the encoded message
114  */
pkcs7_parse_message(const void * data,size_t datalen)115 struct pkcs7_message *pkcs7_parse_message(const void *data, size_t datalen)
116 {
117 	struct pkcs7_parse_context *ctx;
118 	struct pkcs7_message *msg = ERR_PTR(-ENOMEM);
119 	int ret;
120 
121 	ctx = kzalloc(sizeof(struct pkcs7_parse_context), GFP_KERNEL);
122 	if (!ctx)
123 		goto out_no_ctx;
124 	ctx->msg = kzalloc(sizeof(struct pkcs7_message), GFP_KERNEL);
125 	if (!ctx->msg)
126 		goto out_no_msg;
127 	ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL);
128 	if (!ctx->sinfo)
129 		goto out_no_sinfo;
130 	ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature),
131 				  GFP_KERNEL);
132 	if (!ctx->sinfo->sig)
133 		goto out_no_sig;
134 
135 	ctx->data = (unsigned long)data;
136 	ctx->ppcerts = &ctx->certs;
137 	ctx->ppsinfo = &ctx->msg->signed_infos;
138 
139 	/* Attempt to decode the signature */
140 	ret = asn1_ber_decoder(&pkcs7_decoder, ctx, data, datalen);
141 	if (ret < 0) {
142 		msg = ERR_PTR(ret);
143 		goto out;
144 	}
145 
146 	ret = pkcs7_check_authattrs(ctx->msg);
147 	if (ret < 0) {
148 		msg = ERR_PTR(ret);
149 		goto out;
150 	}
151 
152 	msg = ctx->msg;
153 	ctx->msg = NULL;
154 
155 out:
156 	while (ctx->certs) {
157 		struct x509_certificate *cert = ctx->certs;
158 		ctx->certs = cert->next;
159 		x509_free_certificate(cert);
160 	}
161 out_no_sig:
162 	pkcs7_free_signed_info(ctx->sinfo);
163 out_no_sinfo:
164 	pkcs7_free_message(ctx->msg);
165 out_no_msg:
166 	kfree(ctx);
167 out_no_ctx:
168 	return msg;
169 }
170 EXPORT_SYMBOL_GPL(pkcs7_parse_message);
171 
172 /**
173  * pkcs7_get_content_data - Get access to the PKCS#7 content
174  * @pkcs7: The preparsed PKCS#7 message to access
175  * @_data: Place to return a pointer to the data
176  * @_data_len: Place to return the data length
177  * @_headerlen: Size of ASN.1 header not included in _data
178  *
179  * Get access to the data content of the PKCS#7 message.  The size of the
180  * header of the ASN.1 object that contains it is also provided and can be used
181  * to adjust *_data and *_data_len to get the entire object.
182  *
183  * Returns -ENODATA if the data object was missing from the message.
184  */
pkcs7_get_content_data(const struct pkcs7_message * pkcs7,const void ** _data,size_t * _data_len,size_t * _headerlen)185 int pkcs7_get_content_data(const struct pkcs7_message *pkcs7,
186 			   const void **_data, size_t *_data_len,
187 			   size_t *_headerlen)
188 {
189 	if (!pkcs7->data)
190 		return -ENODATA;
191 
192 	*_data = pkcs7->data;
193 	*_data_len = pkcs7->data_len;
194 	if (_headerlen)
195 		*_headerlen = pkcs7->data_hdrlen;
196 	return 0;
197 }
198 EXPORT_SYMBOL_GPL(pkcs7_get_content_data);
199 
200 /*
201  * Note an OID when we find one for later processing when we know how
202  * to interpret it.
203  */
pkcs7_note_OID(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)204 int pkcs7_note_OID(void *context, size_t hdrlen,
205 		   unsigned char tag,
206 		   const void *value, size_t vlen)
207 {
208 	struct pkcs7_parse_context *ctx = context;
209 
210 	ctx->last_oid = look_up_OID(value, vlen);
211 	if (ctx->last_oid == OID__NR) {
212 		char buffer[50];
213 		sprint_oid(value, vlen, buffer, sizeof(buffer));
214 		printk("PKCS7: Unknown OID: [%lu] %s\n",
215 		       (unsigned long)value - ctx->data, buffer);
216 	}
217 	return 0;
218 }
219 
220 /*
221  * Note the digest algorithm for the signature.
222  */
pkcs7_sig_note_digest_algo(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)223 int pkcs7_sig_note_digest_algo(void *context, size_t hdrlen,
224 			       unsigned char tag,
225 			       const void *value, size_t vlen)
226 {
227 	struct pkcs7_parse_context *ctx = context;
228 
229 	switch (ctx->last_oid) {
230 	case OID_md4:
231 		ctx->sinfo->sig->hash_algo = "md4";
232 		break;
233 	case OID_md5:
234 		ctx->sinfo->sig->hash_algo = "md5";
235 		break;
236 	case OID_sha1:
237 		ctx->sinfo->sig->hash_algo = "sha1";
238 		break;
239 	case OID_sha256:
240 		ctx->sinfo->sig->hash_algo = "sha256";
241 		break;
242 	case OID_sha384:
243 		ctx->sinfo->sig->hash_algo = "sha384";
244 		break;
245 	case OID_sha512:
246 		ctx->sinfo->sig->hash_algo = "sha512";
247 		break;
248 	case OID_sha224:
249 		ctx->sinfo->sig->hash_algo = "sha224";
250 		break;
251 	default:
252 		printk("Unsupported digest algo: %u\n", ctx->last_oid);
253 		return -ENOPKG;
254 	}
255 	return 0;
256 }
257 
258 /*
259  * Note the public key algorithm for the signature.
260  */
pkcs7_sig_note_pkey_algo(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)261 int pkcs7_sig_note_pkey_algo(void *context, size_t hdrlen,
262 			     unsigned char tag,
263 			     const void *value, size_t vlen)
264 {
265 	struct pkcs7_parse_context *ctx = context;
266 
267 	switch (ctx->last_oid) {
268 	case OID_rsaEncryption:
269 		ctx->sinfo->sig->pkey_algo = "rsa";
270 		ctx->sinfo->sig->encoding = "pkcs1";
271 		break;
272 	case OID_id_ecdsa_with_sha1:
273 	case OID_id_ecdsa_with_sha224:
274 	case OID_id_ecdsa_with_sha256:
275 	case OID_id_ecdsa_with_sha384:
276 	case OID_id_ecdsa_with_sha512:
277 		ctx->sinfo->sig->pkey_algo = "ecdsa";
278 		ctx->sinfo->sig->encoding = "x962";
279 		break;
280 	default:
281 		printk("Unsupported pkey algo: %u\n", ctx->last_oid);
282 		return -ENOPKG;
283 	}
284 	return 0;
285 }
286 
287 /*
288  * We only support signed data [RFC2315 sec 9].
289  */
pkcs7_check_content_type(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)290 int pkcs7_check_content_type(void *context, size_t hdrlen,
291 			     unsigned char tag,
292 			     const void *value, size_t vlen)
293 {
294 	struct pkcs7_parse_context *ctx = context;
295 
296 	if (ctx->last_oid != OID_signed_data) {
297 		pr_warn("Only support pkcs7_signedData type\n");
298 		return -EINVAL;
299 	}
300 
301 	return 0;
302 }
303 
304 /*
305  * Note the SignedData version
306  */
pkcs7_note_signeddata_version(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)307 int pkcs7_note_signeddata_version(void *context, size_t hdrlen,
308 				  unsigned char tag,
309 				  const void *value, size_t vlen)
310 {
311 	struct pkcs7_parse_context *ctx = context;
312 	unsigned version;
313 
314 	if (vlen != 1)
315 		goto unsupported;
316 
317 	ctx->msg->version = version = *(const u8 *)value;
318 	switch (version) {
319 	case 1:
320 		/* PKCS#7 SignedData [RFC2315 sec 9.1]
321 		 * CMS ver 1 SignedData [RFC5652 sec 5.1]
322 		 */
323 		break;
324 	case 3:
325 		/* CMS ver 3 SignedData [RFC2315 sec 5.1] */
326 		break;
327 	default:
328 		goto unsupported;
329 	}
330 
331 	return 0;
332 
333 unsupported:
334 	pr_warn("Unsupported SignedData version\n");
335 	return -EINVAL;
336 }
337 
338 /*
339  * Note the SignerInfo version
340  */
pkcs7_note_signerinfo_version(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)341 int pkcs7_note_signerinfo_version(void *context, size_t hdrlen,
342 				  unsigned char tag,
343 				  const void *value, size_t vlen)
344 {
345 	struct pkcs7_parse_context *ctx = context;
346 	unsigned version;
347 
348 	if (vlen != 1)
349 		goto unsupported;
350 
351 	version = *(const u8 *)value;
352 	switch (version) {
353 	case 1:
354 		/* PKCS#7 SignerInfo [RFC2315 sec 9.2]
355 		 * CMS ver 1 SignerInfo [RFC5652 sec 5.3]
356 		 */
357 		if (ctx->msg->version != 1)
358 			goto version_mismatch;
359 		ctx->expect_skid = false;
360 		break;
361 	case 3:
362 		/* CMS ver 3 SignerInfo [RFC2315 sec 5.3] */
363 		if (ctx->msg->version == 1)
364 			goto version_mismatch;
365 		ctx->expect_skid = true;
366 		break;
367 	default:
368 		goto unsupported;
369 	}
370 
371 	return 0;
372 
373 unsupported:
374 	pr_warn("Unsupported SignerInfo version\n");
375 	return -EINVAL;
376 version_mismatch:
377 	pr_warn("SignedData-SignerInfo version mismatch\n");
378 	return -EBADMSG;
379 }
380 
381 /*
382  * Extract a certificate and store it in the context.
383  */
pkcs7_extract_cert(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)384 int pkcs7_extract_cert(void *context, size_t hdrlen,
385 		       unsigned char tag,
386 		       const void *value, size_t vlen)
387 {
388 	struct pkcs7_parse_context *ctx = context;
389 	struct x509_certificate *x509;
390 
391 	if (tag != ((ASN1_UNIV << 6) | ASN1_CONS_BIT | ASN1_SEQ)) {
392 		pr_debug("Cert began with tag %02x at %lu\n",
393 			 tag, (unsigned long)ctx - ctx->data);
394 		return -EBADMSG;
395 	}
396 
397 	/* We have to correct for the header so that the X.509 parser can start
398 	 * from the beginning.  Note that since X.509 stipulates DER, there
399 	 * probably shouldn't be an EOC trailer - but it is in PKCS#7 (which
400 	 * stipulates BER).
401 	 */
402 	value -= hdrlen;
403 	vlen += hdrlen;
404 
405 	if (((u8*)value)[1] == 0x80)
406 		vlen += 2; /* Indefinite length - there should be an EOC */
407 
408 	x509 = x509_cert_parse(value, vlen);
409 	if (IS_ERR(x509))
410 		return PTR_ERR(x509);
411 
412 	x509->index = ++ctx->x509_index;
413 	pr_debug("Got cert %u for %s\n", x509->index, x509->subject);
414 	pr_debug("- fingerprint %*phN\n", x509->id->len, x509->id->data);
415 
416 	*ctx->ppcerts = x509;
417 	ctx->ppcerts = &x509->next;
418 	return 0;
419 }
420 
421 /*
422  * Save the certificate list
423  */
pkcs7_note_certificate_list(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)424 int pkcs7_note_certificate_list(void *context, size_t hdrlen,
425 				unsigned char tag,
426 				const void *value, size_t vlen)
427 {
428 	struct pkcs7_parse_context *ctx = context;
429 
430 	pr_devel("Got cert list (%02x)\n", tag);
431 
432 	*ctx->ppcerts = ctx->msg->certs;
433 	ctx->msg->certs = ctx->certs;
434 	ctx->certs = NULL;
435 	ctx->ppcerts = &ctx->certs;
436 	return 0;
437 }
438 
439 /*
440  * Note the content type.
441  */
pkcs7_note_content(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)442 int pkcs7_note_content(void *context, size_t hdrlen,
443 		       unsigned char tag,
444 		       const void *value, size_t vlen)
445 {
446 	struct pkcs7_parse_context *ctx = context;
447 
448 	if (ctx->last_oid != OID_data &&
449 	    ctx->last_oid != OID_msIndirectData) {
450 		pr_warn("Unsupported data type %d\n", ctx->last_oid);
451 		return -EINVAL;
452 	}
453 
454 	ctx->msg->data_type = ctx->last_oid;
455 	return 0;
456 }
457 
458 /*
459  * Extract the data from the message and store that and its content type OID in
460  * the context.
461  */
pkcs7_note_data(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)462 int pkcs7_note_data(void *context, size_t hdrlen,
463 		    unsigned char tag,
464 		    const void *value, size_t vlen)
465 {
466 	struct pkcs7_parse_context *ctx = context;
467 
468 	pr_debug("Got data\n");
469 
470 	ctx->msg->data = value;
471 	ctx->msg->data_len = vlen;
472 	ctx->msg->data_hdrlen = hdrlen;
473 	return 0;
474 }
475 
476 /*
477  * Parse authenticated attributes.
478  */
pkcs7_sig_note_authenticated_attr(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)479 int pkcs7_sig_note_authenticated_attr(void *context, size_t hdrlen,
480 				      unsigned char tag,
481 				      const void *value, size_t vlen)
482 {
483 	struct pkcs7_parse_context *ctx = context;
484 	struct pkcs7_signed_info *sinfo = ctx->sinfo;
485 	enum OID content_type;
486 
487 	pr_devel("AuthAttr: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value);
488 
489 	switch (ctx->last_oid) {
490 	case OID_contentType:
491 		if (__test_and_set_bit(sinfo_has_content_type, &sinfo->aa_set))
492 			goto repeated;
493 		content_type = look_up_OID(value, vlen);
494 		if (content_type != ctx->msg->data_type) {
495 			pr_warn("Mismatch between global data type (%d) and sinfo %u (%d)\n",
496 				ctx->msg->data_type, sinfo->index,
497 				content_type);
498 			return -EBADMSG;
499 		}
500 		return 0;
501 
502 	case OID_signingTime:
503 		if (__test_and_set_bit(sinfo_has_signing_time, &sinfo->aa_set))
504 			goto repeated;
505 		/* Should we check that the signing time is consistent
506 		 * with the signer's X.509 cert?
507 		 */
508 		return x509_decode_time(&sinfo->signing_time,
509 					hdrlen, tag, value, vlen);
510 
511 	case OID_messageDigest:
512 		if (__test_and_set_bit(sinfo_has_message_digest, &sinfo->aa_set))
513 			goto repeated;
514 		if (tag != ASN1_OTS)
515 			return -EBADMSG;
516 		sinfo->msgdigest = value;
517 		sinfo->msgdigest_len = vlen;
518 		return 0;
519 
520 	case OID_smimeCapabilites:
521 		if (__test_and_set_bit(sinfo_has_smime_caps, &sinfo->aa_set))
522 			goto repeated;
523 		if (ctx->msg->data_type != OID_msIndirectData) {
524 			pr_warn("S/MIME Caps only allowed with Authenticode\n");
525 			return -EKEYREJECTED;
526 		}
527 		return 0;
528 
529 		/* Microsoft SpOpusInfo seems to be contain cont[0] 16-bit BE
530 		 * char URLs and cont[1] 8-bit char URLs.
531 		 *
532 		 * Microsoft StatementType seems to contain a list of OIDs that
533 		 * are also used as extendedKeyUsage types in X.509 certs.
534 		 */
535 	case OID_msSpOpusInfo:
536 		if (__test_and_set_bit(sinfo_has_ms_opus_info, &sinfo->aa_set))
537 			goto repeated;
538 		goto authenticode_check;
539 	case OID_msStatementType:
540 		if (__test_and_set_bit(sinfo_has_ms_statement_type, &sinfo->aa_set))
541 			goto repeated;
542 	authenticode_check:
543 		if (ctx->msg->data_type != OID_msIndirectData) {
544 			pr_warn("Authenticode AuthAttrs only allowed with Authenticode\n");
545 			return -EKEYREJECTED;
546 		}
547 		/* I'm not sure how to validate these */
548 		return 0;
549 	default:
550 		return 0;
551 	}
552 
553 repeated:
554 	/* We permit max one item per AuthenticatedAttribute and no repeats */
555 	pr_warn("Repeated/multivalue AuthAttrs not permitted\n");
556 	return -EKEYREJECTED;
557 }
558 
559 /*
560  * Note the set of auth attributes for digestion purposes [RFC2315 sec 9.3]
561  */
pkcs7_sig_note_set_of_authattrs(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)562 int pkcs7_sig_note_set_of_authattrs(void *context, size_t hdrlen,
563 				    unsigned char tag,
564 				    const void *value, size_t vlen)
565 {
566 	struct pkcs7_parse_context *ctx = context;
567 	struct pkcs7_signed_info *sinfo = ctx->sinfo;
568 
569 	if (!test_bit(sinfo_has_content_type, &sinfo->aa_set) ||
570 	    !test_bit(sinfo_has_message_digest, &sinfo->aa_set)) {
571 		pr_warn("Missing required AuthAttr\n");
572 		return -EBADMSG;
573 	}
574 
575 	if (ctx->msg->data_type != OID_msIndirectData &&
576 	    test_bit(sinfo_has_ms_opus_info, &sinfo->aa_set)) {
577 		pr_warn("Unexpected Authenticode AuthAttr\n");
578 		return -EBADMSG;
579 	}
580 
581 	/* We need to switch the 'CONT 0' to a 'SET OF' when we digest */
582 	sinfo->authattrs = value - (hdrlen - 1);
583 	sinfo->authattrs_len = vlen + (hdrlen - 1);
584 	return 0;
585 }
586 
587 /*
588  * Note the issuing certificate serial number
589  */
pkcs7_sig_note_serial(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)590 int pkcs7_sig_note_serial(void *context, size_t hdrlen,
591 			  unsigned char tag,
592 			  const void *value, size_t vlen)
593 {
594 	struct pkcs7_parse_context *ctx = context;
595 	ctx->raw_serial = value;
596 	ctx->raw_serial_size = vlen;
597 	return 0;
598 }
599 
600 /*
601  * Note the issuer's name
602  */
pkcs7_sig_note_issuer(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)603 int pkcs7_sig_note_issuer(void *context, size_t hdrlen,
604 			  unsigned char tag,
605 			  const void *value, size_t vlen)
606 {
607 	struct pkcs7_parse_context *ctx = context;
608 	ctx->raw_issuer = value;
609 	ctx->raw_issuer_size = vlen;
610 	return 0;
611 }
612 
613 /*
614  * Note the issuing cert's subjectKeyIdentifier
615  */
pkcs7_sig_note_skid(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)616 int pkcs7_sig_note_skid(void *context, size_t hdrlen,
617 			unsigned char tag,
618 			const void *value, size_t vlen)
619 {
620 	struct pkcs7_parse_context *ctx = context;
621 
622 	pr_devel("SKID: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value);
623 
624 	ctx->raw_skid = value;
625 	ctx->raw_skid_size = vlen;
626 	return 0;
627 }
628 
629 /*
630  * Note the signature data
631  */
pkcs7_sig_note_signature(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)632 int pkcs7_sig_note_signature(void *context, size_t hdrlen,
633 			     unsigned char tag,
634 			     const void *value, size_t vlen)
635 {
636 	struct pkcs7_parse_context *ctx = context;
637 
638 	ctx->sinfo->sig->s = kmemdup(value, vlen, GFP_KERNEL);
639 	if (!ctx->sinfo->sig->s)
640 		return -ENOMEM;
641 
642 	ctx->sinfo->sig->s_size = vlen;
643 	return 0;
644 }
645 
646 /*
647  * Note a signature information block
648  */
pkcs7_note_signed_info(void * context,size_t hdrlen,unsigned char tag,const void * value,size_t vlen)649 int pkcs7_note_signed_info(void *context, size_t hdrlen,
650 			   unsigned char tag,
651 			   const void *value, size_t vlen)
652 {
653 	struct pkcs7_parse_context *ctx = context;
654 	struct pkcs7_signed_info *sinfo = ctx->sinfo;
655 	struct asymmetric_key_id *kid;
656 
657 	if (ctx->msg->data_type == OID_msIndirectData && !sinfo->authattrs) {
658 		pr_warn("Authenticode requires AuthAttrs\n");
659 		return -EBADMSG;
660 	}
661 
662 	/* Generate cert issuer + serial number key ID */
663 	if (!ctx->expect_skid) {
664 		kid = asymmetric_key_generate_id(ctx->raw_serial,
665 						 ctx->raw_serial_size,
666 						 ctx->raw_issuer,
667 						 ctx->raw_issuer_size);
668 	} else {
669 		kid = asymmetric_key_generate_id(ctx->raw_skid,
670 						 ctx->raw_skid_size,
671 						 "", 0);
672 	}
673 	if (IS_ERR(kid))
674 		return PTR_ERR(kid);
675 
676 	pr_devel("SINFO KID: %u [%*phN]\n", kid->len, kid->len, kid->data);
677 
678 	sinfo->sig->auth_ids[0] = kid;
679 	sinfo->index = ++ctx->sinfo_index;
680 	*ctx->ppsinfo = sinfo;
681 	ctx->ppsinfo = &sinfo->next;
682 	ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL);
683 	if (!ctx->sinfo)
684 		return -ENOMEM;
685 	ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature),
686 				  GFP_KERNEL);
687 	if (!ctx->sinfo->sig)
688 		return -ENOMEM;
689 	return 0;
690 }
691