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2e3fadbf DH |
1 | /* PKCS#7 parser |
2 | * | |
3 | * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) "PKCS7: "fmt | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/export.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/oid_registry.h> | |
db6c43bd | 18 | #include <crypto/public_key.h> |
2e3fadbf DH |
19 | #include "pkcs7_parser.h" |
20 | #include "pkcs7-asn1.h" | |
21 | ||
22 | struct pkcs7_parse_context { | |
23 | struct pkcs7_message *msg; /* Message being constructed */ | |
24 | struct pkcs7_signed_info *sinfo; /* SignedInfo being constructed */ | |
25 | struct pkcs7_signed_info **ppsinfo; | |
26 | struct x509_certificate *certs; /* Certificate cache */ | |
27 | struct x509_certificate **ppcerts; | |
28 | unsigned long data; /* Start of data */ | |
29 | enum OID last_oid; /* Last OID encountered */ | |
30 | unsigned x509_index; | |
31 | unsigned sinfo_index; | |
46963b77 DH |
32 | const void *raw_serial; |
33 | unsigned raw_serial_size; | |
34 | unsigned raw_issuer_size; | |
35 | const void *raw_issuer; | |
60d65cac DH |
36 | const void *raw_skid; |
37 | unsigned raw_skid_size; | |
38 | bool expect_skid; | |
2e3fadbf DH |
39 | }; |
40 | ||
3cd0920c DH |
41 | /* |
42 | * Free a signed information block. | |
43 | */ | |
44 | static void pkcs7_free_signed_info(struct pkcs7_signed_info *sinfo) | |
45 | { | |
46 | if (sinfo) { | |
566a117a | 47 | public_key_signature_free(sinfo->sig); |
3cd0920c DH |
48 | kfree(sinfo); |
49 | } | |
50 | } | |
51 | ||
2e3fadbf DH |
52 | /** |
53 | * pkcs7_free_message - Free a PKCS#7 message | |
54 | * @pkcs7: The PKCS#7 message to free | |
55 | */ | |
56 | void pkcs7_free_message(struct pkcs7_message *pkcs7) | |
57 | { | |
58 | struct x509_certificate *cert; | |
59 | struct pkcs7_signed_info *sinfo; | |
60 | ||
61 | if (pkcs7) { | |
62 | while (pkcs7->certs) { | |
63 | cert = pkcs7->certs; | |
64 | pkcs7->certs = cert->next; | |
65 | x509_free_certificate(cert); | |
66 | } | |
67 | while (pkcs7->crl) { | |
68 | cert = pkcs7->crl; | |
69 | pkcs7->crl = cert->next; | |
70 | x509_free_certificate(cert); | |
71 | } | |
72 | while (pkcs7->signed_infos) { | |
73 | sinfo = pkcs7->signed_infos; | |
74 | pkcs7->signed_infos = sinfo->next; | |
3cd0920c | 75 | pkcs7_free_signed_info(sinfo); |
2e3fadbf DH |
76 | } |
77 | kfree(pkcs7); | |
78 | } | |
79 | } | |
80 | EXPORT_SYMBOL_GPL(pkcs7_free_message); | |
81 | ||
99db4435 DH |
82 | /* |
83 | * Check authenticatedAttributes are provided or not provided consistently. | |
84 | */ | |
85 | static int pkcs7_check_authattrs(struct pkcs7_message *msg) | |
86 | { | |
87 | struct pkcs7_signed_info *sinfo; | |
06aae592 | 88 | bool want = false; |
99db4435 DH |
89 | |
90 | sinfo = msg->signed_infos; | |
68a1fdbb ES |
91 | if (!sinfo) |
92 | goto inconsistent; | |
93 | ||
99db4435 DH |
94 | if (sinfo->authattrs) { |
95 | want = true; | |
96 | msg->have_authattrs = true; | |
97 | } | |
98 | ||
99 | for (sinfo = sinfo->next; sinfo; sinfo = sinfo->next) | |
100 | if (!!sinfo->authattrs != want) | |
101 | goto inconsistent; | |
102 | return 0; | |
103 | ||
104 | inconsistent: | |
105 | pr_warn("Inconsistently supplied authAttrs\n"); | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
2e3fadbf DH |
109 | /** |
110 | * pkcs7_parse_message - Parse a PKCS#7 message | |
111 | * @data: The raw binary ASN.1 encoded message to be parsed | |
112 | * @datalen: The size of the encoded message | |
113 | */ | |
114 | struct pkcs7_message *pkcs7_parse_message(const void *data, size_t datalen) | |
115 | { | |
116 | struct pkcs7_parse_context *ctx; | |
cecf5d2e DH |
117 | struct pkcs7_message *msg = ERR_PTR(-ENOMEM); |
118 | int ret; | |
2e3fadbf | 119 | |
2e3fadbf DH |
120 | ctx = kzalloc(sizeof(struct pkcs7_parse_context), GFP_KERNEL); |
121 | if (!ctx) | |
cecf5d2e DH |
122 | goto out_no_ctx; |
123 | ctx->msg = kzalloc(sizeof(struct pkcs7_message), GFP_KERNEL); | |
124 | if (!ctx->msg) | |
125 | goto out_no_msg; | |
2e3fadbf DH |
126 | ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL); |
127 | if (!ctx->sinfo) | |
cecf5d2e | 128 | goto out_no_sinfo; |
566a117a DH |
129 | ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature), |
130 | GFP_KERNEL); | |
131 | if (!ctx->sinfo->sig) | |
132 | goto out_no_sig; | |
2e3fadbf | 133 | |
2e3fadbf DH |
134 | ctx->data = (unsigned long)data; |
135 | ctx->ppcerts = &ctx->certs; | |
136 | ctx->ppsinfo = &ctx->msg->signed_infos; | |
137 | ||
138 | /* Attempt to decode the signature */ | |
139 | ret = asn1_ber_decoder(&pkcs7_decoder, ctx, data, datalen); | |
cecf5d2e DH |
140 | if (ret < 0) { |
141 | msg = ERR_PTR(ret); | |
142 | goto out; | |
143 | } | |
144 | ||
99db4435 DH |
145 | ret = pkcs7_check_authattrs(ctx->msg); |
146 | if (ret < 0) | |
147 | goto out; | |
148 | ||
cecf5d2e DH |
149 | msg = ctx->msg; |
150 | ctx->msg = NULL; | |
2e3fadbf | 151 | |
cecf5d2e | 152 | out: |
2e3fadbf DH |
153 | while (ctx->certs) { |
154 | struct x509_certificate *cert = ctx->certs; | |
155 | ctx->certs = cert->next; | |
156 | x509_free_certificate(cert); | |
157 | } | |
566a117a | 158 | out_no_sig: |
3cd0920c | 159 | pkcs7_free_signed_info(ctx->sinfo); |
cecf5d2e DH |
160 | out_no_sinfo: |
161 | pkcs7_free_message(ctx->msg); | |
162 | out_no_msg: | |
2e3fadbf | 163 | kfree(ctx); |
cecf5d2e | 164 | out_no_ctx: |
2e3fadbf | 165 | return msg; |
2e3fadbf DH |
166 | } |
167 | EXPORT_SYMBOL_GPL(pkcs7_parse_message); | |
168 | ||
169 | /** | |
170 | * pkcs7_get_content_data - Get access to the PKCS#7 content | |
171 | * @pkcs7: The preparsed PKCS#7 message to access | |
172 | * @_data: Place to return a pointer to the data | |
173 | * @_data_len: Place to return the data length | |
e68503bd | 174 | * @_headerlen: Size of ASN.1 header not included in _data |
2e3fadbf | 175 | * |
e68503bd DH |
176 | * Get access to the data content of the PKCS#7 message. The size of the |
177 | * header of the ASN.1 object that contains it is also provided and can be used | |
178 | * to adjust *_data and *_data_len to get the entire object. | |
179 | * | |
180 | * Returns -ENODATA if the data object was missing from the message. | |
2e3fadbf DH |
181 | */ |
182 | int pkcs7_get_content_data(const struct pkcs7_message *pkcs7, | |
183 | const void **_data, size_t *_data_len, | |
e68503bd | 184 | size_t *_headerlen) |
2e3fadbf | 185 | { |
2e3fadbf DH |
186 | if (!pkcs7->data) |
187 | return -ENODATA; | |
188 | ||
e68503bd DH |
189 | *_data = pkcs7->data; |
190 | *_data_len = pkcs7->data_len; | |
191 | if (_headerlen) | |
192 | *_headerlen = pkcs7->data_hdrlen; | |
2e3fadbf DH |
193 | return 0; |
194 | } | |
195 | EXPORT_SYMBOL_GPL(pkcs7_get_content_data); | |
196 | ||
197 | /* | |
198 | * Note an OID when we find one for later processing when we know how | |
199 | * to interpret it. | |
200 | */ | |
201 | int pkcs7_note_OID(void *context, size_t hdrlen, | |
202 | unsigned char tag, | |
203 | const void *value, size_t vlen) | |
204 | { | |
205 | struct pkcs7_parse_context *ctx = context; | |
206 | ||
207 | ctx->last_oid = look_up_OID(value, vlen); | |
208 | if (ctx->last_oid == OID__NR) { | |
209 | char buffer[50]; | |
210 | sprint_oid(value, vlen, buffer, sizeof(buffer)); | |
211 | printk("PKCS7: Unknown OID: [%lu] %s\n", | |
212 | (unsigned long)value - ctx->data, buffer); | |
213 | } | |
214 | return 0; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Note the digest algorithm for the signature. | |
219 | */ | |
220 | int pkcs7_sig_note_digest_algo(void *context, size_t hdrlen, | |
221 | unsigned char tag, | |
222 | const void *value, size_t vlen) | |
223 | { | |
224 | struct pkcs7_parse_context *ctx = context; | |
225 | ||
226 | switch (ctx->last_oid) { | |
227 | case OID_md4: | |
566a117a | 228 | ctx->sinfo->sig->hash_algo = "md4"; |
2e3fadbf DH |
229 | break; |
230 | case OID_md5: | |
566a117a | 231 | ctx->sinfo->sig->hash_algo = "md5"; |
2e3fadbf DH |
232 | break; |
233 | case OID_sha1: | |
566a117a | 234 | ctx->sinfo->sig->hash_algo = "sha1"; |
2e3fadbf DH |
235 | break; |
236 | case OID_sha256: | |
566a117a | 237 | ctx->sinfo->sig->hash_algo = "sha256"; |
2e3fadbf | 238 | break; |
07f081fb | 239 | case OID_sha384: |
566a117a | 240 | ctx->sinfo->sig->hash_algo = "sha384"; |
07f081fb DH |
241 | break; |
242 | case OID_sha512: | |
566a117a | 243 | ctx->sinfo->sig->hash_algo = "sha512"; |
07f081fb DH |
244 | break; |
245 | case OID_sha224: | |
566a117a DH |
246 | ctx->sinfo->sig->hash_algo = "sha224"; |
247 | break; | |
2e3fadbf DH |
248 | default: |
249 | printk("Unsupported digest algo: %u\n", ctx->last_oid); | |
250 | return -ENOPKG; | |
251 | } | |
252 | return 0; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Note the public key algorithm for the signature. | |
257 | */ | |
258 | int pkcs7_sig_note_pkey_algo(void *context, size_t hdrlen, | |
259 | unsigned char tag, | |
260 | const void *value, size_t vlen) | |
261 | { | |
262 | struct pkcs7_parse_context *ctx = context; | |
263 | ||
264 | switch (ctx->last_oid) { | |
265 | case OID_rsaEncryption: | |
566a117a | 266 | ctx->sinfo->sig->pkey_algo = "rsa"; |
2e3fadbf DH |
267 | break; |
268 | default: | |
269 | printk("Unsupported pkey algo: %u\n", ctx->last_oid); | |
270 | return -ENOPKG; | |
271 | } | |
272 | return 0; | |
273 | } | |
274 | ||
2c7fd367 DH |
275 | /* |
276 | * We only support signed data [RFC2315 sec 9]. | |
277 | */ | |
278 | int pkcs7_check_content_type(void *context, size_t hdrlen, | |
279 | unsigned char tag, | |
280 | const void *value, size_t vlen) | |
281 | { | |
282 | struct pkcs7_parse_context *ctx = context; | |
283 | ||
284 | if (ctx->last_oid != OID_signed_data) { | |
285 | pr_warn("Only support pkcs7_signedData type\n"); | |
286 | return -EINVAL; | |
287 | } | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | /* | |
293 | * Note the SignedData version | |
294 | */ | |
295 | int pkcs7_note_signeddata_version(void *context, size_t hdrlen, | |
296 | unsigned char tag, | |
297 | const void *value, size_t vlen) | |
298 | { | |
60d65cac | 299 | struct pkcs7_parse_context *ctx = context; |
2c7fd367 DH |
300 | unsigned version; |
301 | ||
302 | if (vlen != 1) | |
303 | goto unsupported; | |
304 | ||
60d65cac | 305 | ctx->msg->version = version = *(const u8 *)value; |
2c7fd367 DH |
306 | switch (version) { |
307 | case 1: | |
60d65cac DH |
308 | /* PKCS#7 SignedData [RFC2315 sec 9.1] |
309 | * CMS ver 1 SignedData [RFC5652 sec 5.1] | |
310 | */ | |
311 | break; | |
312 | case 3: | |
313 | /* CMS ver 3 SignedData [RFC2315 sec 5.1] */ | |
2c7fd367 DH |
314 | break; |
315 | default: | |
316 | goto unsupported; | |
317 | } | |
318 | ||
319 | return 0; | |
320 | ||
321 | unsupported: | |
322 | pr_warn("Unsupported SignedData version\n"); | |
323 | return -EINVAL; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Note the SignerInfo version | |
328 | */ | |
329 | int pkcs7_note_signerinfo_version(void *context, size_t hdrlen, | |
330 | unsigned char tag, | |
331 | const void *value, size_t vlen) | |
332 | { | |
60d65cac | 333 | struct pkcs7_parse_context *ctx = context; |
2c7fd367 DH |
334 | unsigned version; |
335 | ||
336 | if (vlen != 1) | |
337 | goto unsupported; | |
338 | ||
339 | version = *(const u8 *)value; | |
340 | switch (version) { | |
341 | case 1: | |
60d65cac DH |
342 | /* PKCS#7 SignerInfo [RFC2315 sec 9.2] |
343 | * CMS ver 1 SignerInfo [RFC5652 sec 5.3] | |
344 | */ | |
345 | if (ctx->msg->version != 1) | |
346 | goto version_mismatch; | |
347 | ctx->expect_skid = false; | |
348 | break; | |
349 | case 3: | |
350 | /* CMS ver 3 SignerInfo [RFC2315 sec 5.3] */ | |
351 | if (ctx->msg->version == 1) | |
352 | goto version_mismatch; | |
353 | ctx->expect_skid = true; | |
2c7fd367 DH |
354 | break; |
355 | default: | |
356 | goto unsupported; | |
357 | } | |
358 | ||
359 | return 0; | |
360 | ||
361 | unsupported: | |
362 | pr_warn("Unsupported SignerInfo version\n"); | |
363 | return -EINVAL; | |
60d65cac DH |
364 | version_mismatch: |
365 | pr_warn("SignedData-SignerInfo version mismatch\n"); | |
366 | return -EBADMSG; | |
2c7fd367 DH |
367 | } |
368 | ||
2e3fadbf DH |
369 | /* |
370 | * Extract a certificate and store it in the context. | |
371 | */ | |
372 | int pkcs7_extract_cert(void *context, size_t hdrlen, | |
373 | unsigned char tag, | |
374 | const void *value, size_t vlen) | |
375 | { | |
376 | struct pkcs7_parse_context *ctx = context; | |
377 | struct x509_certificate *x509; | |
378 | ||
379 | if (tag != ((ASN1_UNIV << 6) | ASN1_CONS_BIT | ASN1_SEQ)) { | |
380 | pr_debug("Cert began with tag %02x at %lu\n", | |
381 | tag, (unsigned long)ctx - ctx->data); | |
382 | return -EBADMSG; | |
383 | } | |
384 | ||
385 | /* We have to correct for the header so that the X.509 parser can start | |
386 | * from the beginning. Note that since X.509 stipulates DER, there | |
387 | * probably shouldn't be an EOC trailer - but it is in PKCS#7 (which | |
388 | * stipulates BER). | |
389 | */ | |
390 | value -= hdrlen; | |
391 | vlen += hdrlen; | |
392 | ||
393 | if (((u8*)value)[1] == 0x80) | |
394 | vlen += 2; /* Indefinite length - there should be an EOC */ | |
395 | ||
396 | x509 = x509_cert_parse(value, vlen); | |
397 | if (IS_ERR(x509)) | |
398 | return PTR_ERR(x509); | |
399 | ||
2e3fadbf | 400 | x509->index = ++ctx->x509_index; |
46963b77 DH |
401 | pr_debug("Got cert %u for %s\n", x509->index, x509->subject); |
402 | pr_debug("- fingerprint %*phN\n", x509->id->len, x509->id->data); | |
403 | ||
2e3fadbf DH |
404 | *ctx->ppcerts = x509; |
405 | ctx->ppcerts = &x509->next; | |
406 | return 0; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Save the certificate list | |
411 | */ | |
412 | int pkcs7_note_certificate_list(void *context, size_t hdrlen, | |
413 | unsigned char tag, | |
414 | const void *value, size_t vlen) | |
415 | { | |
416 | struct pkcs7_parse_context *ctx = context; | |
417 | ||
418 | pr_devel("Got cert list (%02x)\n", tag); | |
419 | ||
420 | *ctx->ppcerts = ctx->msg->certs; | |
421 | ctx->msg->certs = ctx->certs; | |
422 | ctx->certs = NULL; | |
423 | ctx->ppcerts = &ctx->certs; | |
424 | return 0; | |
425 | } | |
426 | ||
99db4435 DH |
427 | /* |
428 | * Note the content type. | |
429 | */ | |
430 | int pkcs7_note_content(void *context, size_t hdrlen, | |
431 | unsigned char tag, | |
432 | const void *value, size_t vlen) | |
433 | { | |
434 | struct pkcs7_parse_context *ctx = context; | |
435 | ||
436 | if (ctx->last_oid != OID_data && | |
437 | ctx->last_oid != OID_msIndirectData) { | |
438 | pr_warn("Unsupported data type %d\n", ctx->last_oid); | |
439 | return -EINVAL; | |
440 | } | |
441 | ||
442 | ctx->msg->data_type = ctx->last_oid; | |
443 | return 0; | |
444 | } | |
445 | ||
2e3fadbf DH |
446 | /* |
447 | * Extract the data from the message and store that and its content type OID in | |
448 | * the context. | |
449 | */ | |
450 | int pkcs7_note_data(void *context, size_t hdrlen, | |
451 | unsigned char tag, | |
452 | const void *value, size_t vlen) | |
453 | { | |
454 | struct pkcs7_parse_context *ctx = context; | |
455 | ||
456 | pr_debug("Got data\n"); | |
457 | ||
458 | ctx->msg->data = value; | |
459 | ctx->msg->data_len = vlen; | |
460 | ctx->msg->data_hdrlen = hdrlen; | |
2e3fadbf DH |
461 | return 0; |
462 | } | |
463 | ||
464 | /* | |
99db4435 | 465 | * Parse authenticated attributes. |
2e3fadbf DH |
466 | */ |
467 | int pkcs7_sig_note_authenticated_attr(void *context, size_t hdrlen, | |
468 | unsigned char tag, | |
469 | const void *value, size_t vlen) | |
470 | { | |
471 | struct pkcs7_parse_context *ctx = context; | |
99db4435 DH |
472 | struct pkcs7_signed_info *sinfo = ctx->sinfo; |
473 | enum OID content_type; | |
2e3fadbf DH |
474 | |
475 | pr_devel("AuthAttr: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value); | |
476 | ||
477 | switch (ctx->last_oid) { | |
99db4435 DH |
478 | case OID_contentType: |
479 | if (__test_and_set_bit(sinfo_has_content_type, &sinfo->aa_set)) | |
480 | goto repeated; | |
481 | content_type = look_up_OID(value, vlen); | |
482 | if (content_type != ctx->msg->data_type) { | |
483 | pr_warn("Mismatch between global data type (%d) and sinfo %u (%d)\n", | |
484 | ctx->msg->data_type, sinfo->index, | |
485 | content_type); | |
486 | return -EBADMSG; | |
487 | } | |
488 | return 0; | |
489 | ||
490 | case OID_signingTime: | |
491 | if (__test_and_set_bit(sinfo_has_signing_time, &sinfo->aa_set)) | |
492 | goto repeated; | |
493 | /* Should we check that the signing time is consistent | |
494 | * with the signer's X.509 cert? | |
495 | */ | |
496 | return x509_decode_time(&sinfo->signing_time, | |
497 | hdrlen, tag, value, vlen); | |
498 | ||
2e3fadbf | 499 | case OID_messageDigest: |
99db4435 DH |
500 | if (__test_and_set_bit(sinfo_has_message_digest, &sinfo->aa_set)) |
501 | goto repeated; | |
2e3fadbf DH |
502 | if (tag != ASN1_OTS) |
503 | return -EBADMSG; | |
99db4435 DH |
504 | sinfo->msgdigest = value; |
505 | sinfo->msgdigest_len = vlen; | |
506 | return 0; | |
507 | ||
508 | case OID_smimeCapabilites: | |
509 | if (__test_and_set_bit(sinfo_has_smime_caps, &sinfo->aa_set)) | |
510 | goto repeated; | |
511 | if (ctx->msg->data_type != OID_msIndirectData) { | |
512 | pr_warn("S/MIME Caps only allowed with Authenticode\n"); | |
513 | return -EKEYREJECTED; | |
514 | } | |
515 | return 0; | |
516 | ||
517 | /* Microsoft SpOpusInfo seems to be contain cont[0] 16-bit BE | |
518 | * char URLs and cont[1] 8-bit char URLs. | |
519 | * | |
520 | * Microsoft StatementType seems to contain a list of OIDs that | |
521 | * are also used as extendedKeyUsage types in X.509 certs. | |
522 | */ | |
523 | case OID_msSpOpusInfo: | |
524 | if (__test_and_set_bit(sinfo_has_ms_opus_info, &sinfo->aa_set)) | |
525 | goto repeated; | |
526 | goto authenticode_check; | |
527 | case OID_msStatementType: | |
528 | if (__test_and_set_bit(sinfo_has_ms_statement_type, &sinfo->aa_set)) | |
529 | goto repeated; | |
530 | authenticode_check: | |
531 | if (ctx->msg->data_type != OID_msIndirectData) { | |
532 | pr_warn("Authenticode AuthAttrs only allowed with Authenticode\n"); | |
533 | return -EKEYREJECTED; | |
534 | } | |
535 | /* I'm not sure how to validate these */ | |
2e3fadbf DH |
536 | return 0; |
537 | default: | |
538 | return 0; | |
539 | } | |
99db4435 DH |
540 | |
541 | repeated: | |
542 | /* We permit max one item per AuthenticatedAttribute and no repeats */ | |
543 | pr_warn("Repeated/multivalue AuthAttrs not permitted\n"); | |
544 | return -EKEYREJECTED; | |
2e3fadbf DH |
545 | } |
546 | ||
547 | /* | |
2c7fd367 | 548 | * Note the set of auth attributes for digestion purposes [RFC2315 sec 9.3] |
2e3fadbf DH |
549 | */ |
550 | int pkcs7_sig_note_set_of_authattrs(void *context, size_t hdrlen, | |
551 | unsigned char tag, | |
552 | const void *value, size_t vlen) | |
553 | { | |
554 | struct pkcs7_parse_context *ctx = context; | |
99db4435 DH |
555 | struct pkcs7_signed_info *sinfo = ctx->sinfo; |
556 | ||
557 | if (!test_bit(sinfo_has_content_type, &sinfo->aa_set) || | |
7ee7014d | 558 | !test_bit(sinfo_has_message_digest, &sinfo->aa_set)) { |
99db4435 DH |
559 | pr_warn("Missing required AuthAttr\n"); |
560 | return -EBADMSG; | |
561 | } | |
562 | ||
563 | if (ctx->msg->data_type != OID_msIndirectData && | |
564 | test_bit(sinfo_has_ms_opus_info, &sinfo->aa_set)) { | |
565 | pr_warn("Unexpected Authenticode AuthAttr\n"); | |
566 | return -EBADMSG; | |
567 | } | |
2e3fadbf DH |
568 | |
569 | /* We need to switch the 'CONT 0' to a 'SET OF' when we digest */ | |
99db4435 DH |
570 | sinfo->authattrs = value - (hdrlen - 1); |
571 | sinfo->authattrs_len = vlen + (hdrlen - 1); | |
2e3fadbf DH |
572 | return 0; |
573 | } | |
574 | ||
575 | /* | |
576 | * Note the issuing certificate serial number | |
577 | */ | |
578 | int pkcs7_sig_note_serial(void *context, size_t hdrlen, | |
579 | unsigned char tag, | |
580 | const void *value, size_t vlen) | |
581 | { | |
582 | struct pkcs7_parse_context *ctx = context; | |
46963b77 DH |
583 | ctx->raw_serial = value; |
584 | ctx->raw_serial_size = vlen; | |
2e3fadbf DH |
585 | return 0; |
586 | } | |
587 | ||
588 | /* | |
589 | * Note the issuer's name | |
590 | */ | |
591 | int pkcs7_sig_note_issuer(void *context, size_t hdrlen, | |
592 | unsigned char tag, | |
593 | const void *value, size_t vlen) | |
594 | { | |
595 | struct pkcs7_parse_context *ctx = context; | |
46963b77 DH |
596 | ctx->raw_issuer = value; |
597 | ctx->raw_issuer_size = vlen; | |
2e3fadbf DH |
598 | return 0; |
599 | } | |
600 | ||
60d65cac DH |
601 | /* |
602 | * Note the issuing cert's subjectKeyIdentifier | |
603 | */ | |
604 | int pkcs7_sig_note_skid(void *context, size_t hdrlen, | |
605 | unsigned char tag, | |
606 | const void *value, size_t vlen) | |
607 | { | |
608 | struct pkcs7_parse_context *ctx = context; | |
609 | ||
610 | pr_devel("SKID: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value); | |
611 | ||
612 | ctx->raw_skid = value; | |
613 | ctx->raw_skid_size = vlen; | |
614 | return 0; | |
615 | } | |
616 | ||
2e3fadbf DH |
617 | /* |
618 | * Note the signature data | |
619 | */ | |
620 | int pkcs7_sig_note_signature(void *context, size_t hdrlen, | |
621 | unsigned char tag, | |
622 | const void *value, size_t vlen) | |
623 | { | |
624 | struct pkcs7_parse_context *ctx = context; | |
2e3fadbf | 625 | |
566a117a DH |
626 | ctx->sinfo->sig->s = kmemdup(value, vlen, GFP_KERNEL); |
627 | if (!ctx->sinfo->sig->s) | |
2e3fadbf DH |
628 | return -ENOMEM; |
629 | ||
566a117a | 630 | ctx->sinfo->sig->s_size = vlen; |
2e3fadbf DH |
631 | return 0; |
632 | } | |
633 | ||
634 | /* | |
635 | * Note a signature information block | |
636 | */ | |
637 | int pkcs7_note_signed_info(void *context, size_t hdrlen, | |
638 | unsigned char tag, | |
639 | const void *value, size_t vlen) | |
640 | { | |
641 | struct pkcs7_parse_context *ctx = context; | |
46963b77 DH |
642 | struct pkcs7_signed_info *sinfo = ctx->sinfo; |
643 | struct asymmetric_key_id *kid; | |
644 | ||
99db4435 DH |
645 | if (ctx->msg->data_type == OID_msIndirectData && !sinfo->authattrs) { |
646 | pr_warn("Authenticode requires AuthAttrs\n"); | |
647 | return -EBADMSG; | |
648 | } | |
649 | ||
46963b77 | 650 | /* Generate cert issuer + serial number key ID */ |
60d65cac DH |
651 | if (!ctx->expect_skid) { |
652 | kid = asymmetric_key_generate_id(ctx->raw_serial, | |
653 | ctx->raw_serial_size, | |
654 | ctx->raw_issuer, | |
655 | ctx->raw_issuer_size); | |
656 | } else { | |
657 | kid = asymmetric_key_generate_id(ctx->raw_skid, | |
658 | ctx->raw_skid_size, | |
659 | "", 0); | |
660 | } | |
46963b77 DH |
661 | if (IS_ERR(kid)) |
662 | return PTR_ERR(kid); | |
663 | ||
60d65cac DH |
664 | pr_devel("SINFO KID: %u [%*phN]\n", kid->len, kid->len, kid->data); |
665 | ||
566a117a | 666 | sinfo->sig->auth_ids[0] = kid; |
46963b77 DH |
667 | sinfo->index = ++ctx->sinfo_index; |
668 | *ctx->ppsinfo = sinfo; | |
669 | ctx->ppsinfo = &sinfo->next; | |
2e3fadbf DH |
670 | ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL); |
671 | if (!ctx->sinfo) | |
672 | return -ENOMEM; | |
566a117a DH |
673 | ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature), |
674 | GFP_KERNEL); | |
675 | if (!ctx->sinfo->sig) | |
676 | return -ENOMEM; | |
2e3fadbf DH |
677 | return 0; |
678 | } |