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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> | |
1e684d38 | 14 | #include <linux/module.h> |
2e3fadbf DH |
15 | #include <linux/export.h> |
16 | #include <linux/slab.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/oid_registry.h> | |
db6c43bd | 19 | #include <crypto/public_key.h> |
2e3fadbf DH |
20 | #include "pkcs7_parser.h" |
21 | #include "pkcs7-asn1.h" | |
22 | ||
1e684d38 DH |
23 | MODULE_DESCRIPTION("PKCS#7 parser"); |
24 | MODULE_AUTHOR("Red Hat, Inc."); | |
25 | MODULE_LICENSE("GPL"); | |
26 | ||
2e3fadbf DH |
27 | struct pkcs7_parse_context { |
28 | struct pkcs7_message *msg; /* Message being constructed */ | |
29 | struct pkcs7_signed_info *sinfo; /* SignedInfo being constructed */ | |
30 | struct pkcs7_signed_info **ppsinfo; | |
31 | struct x509_certificate *certs; /* Certificate cache */ | |
32 | struct x509_certificate **ppcerts; | |
33 | unsigned long data; /* Start of data */ | |
34 | enum OID last_oid; /* Last OID encountered */ | |
35 | unsigned x509_index; | |
36 | unsigned sinfo_index; | |
46963b77 DH |
37 | const void *raw_serial; |
38 | unsigned raw_serial_size; | |
39 | unsigned raw_issuer_size; | |
40 | const void *raw_issuer; | |
60d65cac DH |
41 | const void *raw_skid; |
42 | unsigned raw_skid_size; | |
43 | bool expect_skid; | |
2e3fadbf DH |
44 | }; |
45 | ||
3cd0920c DH |
46 | /* |
47 | * Free a signed information block. | |
48 | */ | |
49 | static void pkcs7_free_signed_info(struct pkcs7_signed_info *sinfo) | |
50 | { | |
51 | if (sinfo) { | |
566a117a | 52 | public_key_signature_free(sinfo->sig); |
3cd0920c DH |
53 | kfree(sinfo); |
54 | } | |
55 | } | |
56 | ||
2e3fadbf DH |
57 | /** |
58 | * pkcs7_free_message - Free a PKCS#7 message | |
59 | * @pkcs7: The PKCS#7 message to free | |
60 | */ | |
61 | void pkcs7_free_message(struct pkcs7_message *pkcs7) | |
62 | { | |
63 | struct x509_certificate *cert; | |
64 | struct pkcs7_signed_info *sinfo; | |
65 | ||
66 | if (pkcs7) { | |
67 | while (pkcs7->certs) { | |
68 | cert = pkcs7->certs; | |
69 | pkcs7->certs = cert->next; | |
70 | x509_free_certificate(cert); | |
71 | } | |
72 | while (pkcs7->crl) { | |
73 | cert = pkcs7->crl; | |
74 | pkcs7->crl = cert->next; | |
75 | x509_free_certificate(cert); | |
76 | } | |
77 | while (pkcs7->signed_infos) { | |
78 | sinfo = pkcs7->signed_infos; | |
79 | pkcs7->signed_infos = sinfo->next; | |
3cd0920c | 80 | pkcs7_free_signed_info(sinfo); |
2e3fadbf DH |
81 | } |
82 | kfree(pkcs7); | |
83 | } | |
84 | } | |
85 | EXPORT_SYMBOL_GPL(pkcs7_free_message); | |
86 | ||
99db4435 DH |
87 | /* |
88 | * Check authenticatedAttributes are provided or not provided consistently. | |
89 | */ | |
90 | static int pkcs7_check_authattrs(struct pkcs7_message *msg) | |
91 | { | |
92 | struct pkcs7_signed_info *sinfo; | |
06aae592 | 93 | bool want = false; |
99db4435 DH |
94 | |
95 | sinfo = msg->signed_infos; | |
68a1fdbb ES |
96 | if (!sinfo) |
97 | goto inconsistent; | |
98 | ||
99db4435 DH |
99 | if (sinfo->authattrs) { |
100 | want = true; | |
101 | msg->have_authattrs = true; | |
102 | } | |
103 | ||
104 | for (sinfo = sinfo->next; sinfo; sinfo = sinfo->next) | |
105 | if (!!sinfo->authattrs != want) | |
106 | goto inconsistent; | |
107 | return 0; | |
108 | ||
109 | inconsistent: | |
110 | pr_warn("Inconsistently supplied authAttrs\n"); | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
2e3fadbf DH |
114 | /** |
115 | * pkcs7_parse_message - Parse a PKCS#7 message | |
116 | * @data: The raw binary ASN.1 encoded message to be parsed | |
117 | * @datalen: The size of the encoded message | |
118 | */ | |
119 | struct pkcs7_message *pkcs7_parse_message(const void *data, size_t datalen) | |
120 | { | |
121 | struct pkcs7_parse_context *ctx; | |
cecf5d2e DH |
122 | struct pkcs7_message *msg = ERR_PTR(-ENOMEM); |
123 | int ret; | |
2e3fadbf | 124 | |
2e3fadbf DH |
125 | ctx = kzalloc(sizeof(struct pkcs7_parse_context), GFP_KERNEL); |
126 | if (!ctx) | |
cecf5d2e DH |
127 | goto out_no_ctx; |
128 | ctx->msg = kzalloc(sizeof(struct pkcs7_message), GFP_KERNEL); | |
129 | if (!ctx->msg) | |
130 | goto out_no_msg; | |
2e3fadbf DH |
131 | ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL); |
132 | if (!ctx->sinfo) | |
cecf5d2e | 133 | goto out_no_sinfo; |
566a117a DH |
134 | ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature), |
135 | GFP_KERNEL); | |
136 | if (!ctx->sinfo->sig) | |
137 | goto out_no_sig; | |
2e3fadbf | 138 | |
2e3fadbf DH |
139 | ctx->data = (unsigned long)data; |
140 | ctx->ppcerts = &ctx->certs; | |
141 | ctx->ppsinfo = &ctx->msg->signed_infos; | |
142 | ||
143 | /* Attempt to decode the signature */ | |
144 | ret = asn1_ber_decoder(&pkcs7_decoder, ctx, data, datalen); | |
cecf5d2e DH |
145 | if (ret < 0) { |
146 | msg = ERR_PTR(ret); | |
147 | goto out; | |
148 | } | |
149 | ||
99db4435 | 150 | ret = pkcs7_check_authattrs(ctx->msg); |
8ecb506d EB |
151 | if (ret < 0) { |
152 | msg = ERR_PTR(ret); | |
99db4435 | 153 | goto out; |
8ecb506d | 154 | } |
99db4435 | 155 | |
cecf5d2e DH |
156 | msg = ctx->msg; |
157 | ctx->msg = NULL; | |
2e3fadbf | 158 | |
cecf5d2e | 159 | out: |
2e3fadbf DH |
160 | while (ctx->certs) { |
161 | struct x509_certificate *cert = ctx->certs; | |
162 | ctx->certs = cert->next; | |
163 | x509_free_certificate(cert); | |
164 | } | |
566a117a | 165 | out_no_sig: |
3cd0920c | 166 | pkcs7_free_signed_info(ctx->sinfo); |
cecf5d2e DH |
167 | out_no_sinfo: |
168 | pkcs7_free_message(ctx->msg); | |
169 | out_no_msg: | |
2e3fadbf | 170 | kfree(ctx); |
cecf5d2e | 171 | out_no_ctx: |
2e3fadbf | 172 | return msg; |
2e3fadbf DH |
173 | } |
174 | EXPORT_SYMBOL_GPL(pkcs7_parse_message); | |
175 | ||
176 | /** | |
177 | * pkcs7_get_content_data - Get access to the PKCS#7 content | |
178 | * @pkcs7: The preparsed PKCS#7 message to access | |
179 | * @_data: Place to return a pointer to the data | |
180 | * @_data_len: Place to return the data length | |
e68503bd | 181 | * @_headerlen: Size of ASN.1 header not included in _data |
2e3fadbf | 182 | * |
e68503bd DH |
183 | * Get access to the data content of the PKCS#7 message. The size of the |
184 | * header of the ASN.1 object that contains it is also provided and can be used | |
185 | * to adjust *_data and *_data_len to get the entire object. | |
186 | * | |
187 | * Returns -ENODATA if the data object was missing from the message. | |
2e3fadbf DH |
188 | */ |
189 | int pkcs7_get_content_data(const struct pkcs7_message *pkcs7, | |
190 | const void **_data, size_t *_data_len, | |
e68503bd | 191 | size_t *_headerlen) |
2e3fadbf | 192 | { |
2e3fadbf DH |
193 | if (!pkcs7->data) |
194 | return -ENODATA; | |
195 | ||
e68503bd DH |
196 | *_data = pkcs7->data; |
197 | *_data_len = pkcs7->data_len; | |
198 | if (_headerlen) | |
199 | *_headerlen = pkcs7->data_hdrlen; | |
2e3fadbf DH |
200 | return 0; |
201 | } | |
202 | EXPORT_SYMBOL_GPL(pkcs7_get_content_data); | |
203 | ||
204 | /* | |
205 | * Note an OID when we find one for later processing when we know how | |
206 | * to interpret it. | |
207 | */ | |
208 | int pkcs7_note_OID(void *context, size_t hdrlen, | |
209 | unsigned char tag, | |
210 | const void *value, size_t vlen) | |
211 | { | |
212 | struct pkcs7_parse_context *ctx = context; | |
213 | ||
214 | ctx->last_oid = look_up_OID(value, vlen); | |
215 | if (ctx->last_oid == OID__NR) { | |
216 | char buffer[50]; | |
217 | sprint_oid(value, vlen, buffer, sizeof(buffer)); | |
218 | printk("PKCS7: Unknown OID: [%lu] %s\n", | |
219 | (unsigned long)value - ctx->data, buffer); | |
220 | } | |
221 | return 0; | |
222 | } | |
223 | ||
224 | /* | |
225 | * Note the digest algorithm for the signature. | |
226 | */ | |
227 | int pkcs7_sig_note_digest_algo(void *context, size_t hdrlen, | |
228 | unsigned char tag, | |
229 | const void *value, size_t vlen) | |
230 | { | |
231 | struct pkcs7_parse_context *ctx = context; | |
232 | ||
233 | switch (ctx->last_oid) { | |
234 | case OID_md4: | |
566a117a | 235 | ctx->sinfo->sig->hash_algo = "md4"; |
2e3fadbf DH |
236 | break; |
237 | case OID_md5: | |
566a117a | 238 | ctx->sinfo->sig->hash_algo = "md5"; |
2e3fadbf DH |
239 | break; |
240 | case OID_sha1: | |
566a117a | 241 | ctx->sinfo->sig->hash_algo = "sha1"; |
2e3fadbf DH |
242 | break; |
243 | case OID_sha256: | |
566a117a | 244 | ctx->sinfo->sig->hash_algo = "sha256"; |
2e3fadbf | 245 | break; |
07f081fb | 246 | case OID_sha384: |
566a117a | 247 | ctx->sinfo->sig->hash_algo = "sha384"; |
07f081fb DH |
248 | break; |
249 | case OID_sha512: | |
566a117a | 250 | ctx->sinfo->sig->hash_algo = "sha512"; |
07f081fb DH |
251 | break; |
252 | case OID_sha224: | |
566a117a DH |
253 | ctx->sinfo->sig->hash_algo = "sha224"; |
254 | break; | |
2e3fadbf DH |
255 | default: |
256 | printk("Unsupported digest algo: %u\n", ctx->last_oid); | |
257 | return -ENOPKG; | |
258 | } | |
259 | return 0; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Note the public key algorithm for the signature. | |
264 | */ | |
265 | int pkcs7_sig_note_pkey_algo(void *context, size_t hdrlen, | |
266 | unsigned char tag, | |
267 | const void *value, size_t vlen) | |
268 | { | |
269 | struct pkcs7_parse_context *ctx = context; | |
270 | ||
271 | switch (ctx->last_oid) { | |
272 | case OID_rsaEncryption: | |
566a117a | 273 | ctx->sinfo->sig->pkey_algo = "rsa"; |
2e3fadbf DH |
274 | break; |
275 | default: | |
276 | printk("Unsupported pkey algo: %u\n", ctx->last_oid); | |
277 | return -ENOPKG; | |
278 | } | |
279 | return 0; | |
280 | } | |
281 | ||
2c7fd367 DH |
282 | /* |
283 | * We only support signed data [RFC2315 sec 9]. | |
284 | */ | |
285 | int pkcs7_check_content_type(void *context, size_t hdrlen, | |
286 | unsigned char tag, | |
287 | const void *value, size_t vlen) | |
288 | { | |
289 | struct pkcs7_parse_context *ctx = context; | |
290 | ||
291 | if (ctx->last_oid != OID_signed_data) { | |
292 | pr_warn("Only support pkcs7_signedData type\n"); | |
293 | return -EINVAL; | |
294 | } | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | /* | |
300 | * Note the SignedData version | |
301 | */ | |
302 | int pkcs7_note_signeddata_version(void *context, size_t hdrlen, | |
303 | unsigned char tag, | |
304 | const void *value, size_t vlen) | |
305 | { | |
60d65cac | 306 | struct pkcs7_parse_context *ctx = context; |
2c7fd367 DH |
307 | unsigned version; |
308 | ||
309 | if (vlen != 1) | |
310 | goto unsupported; | |
311 | ||
60d65cac | 312 | ctx->msg->version = version = *(const u8 *)value; |
2c7fd367 DH |
313 | switch (version) { |
314 | case 1: | |
60d65cac DH |
315 | /* PKCS#7 SignedData [RFC2315 sec 9.1] |
316 | * CMS ver 1 SignedData [RFC5652 sec 5.1] | |
317 | */ | |
318 | break; | |
319 | case 3: | |
320 | /* CMS ver 3 SignedData [RFC2315 sec 5.1] */ | |
2c7fd367 DH |
321 | break; |
322 | default: | |
323 | goto unsupported; | |
324 | } | |
325 | ||
326 | return 0; | |
327 | ||
328 | unsupported: | |
329 | pr_warn("Unsupported SignedData version\n"); | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Note the SignerInfo version | |
335 | */ | |
336 | int pkcs7_note_signerinfo_version(void *context, size_t hdrlen, | |
337 | unsigned char tag, | |
338 | const void *value, size_t vlen) | |
339 | { | |
60d65cac | 340 | struct pkcs7_parse_context *ctx = context; |
2c7fd367 DH |
341 | unsigned version; |
342 | ||
343 | if (vlen != 1) | |
344 | goto unsupported; | |
345 | ||
346 | version = *(const u8 *)value; | |
347 | switch (version) { | |
348 | case 1: | |
60d65cac DH |
349 | /* PKCS#7 SignerInfo [RFC2315 sec 9.2] |
350 | * CMS ver 1 SignerInfo [RFC5652 sec 5.3] | |
351 | */ | |
352 | if (ctx->msg->version != 1) | |
353 | goto version_mismatch; | |
354 | ctx->expect_skid = false; | |
355 | break; | |
356 | case 3: | |
357 | /* CMS ver 3 SignerInfo [RFC2315 sec 5.3] */ | |
358 | if (ctx->msg->version == 1) | |
359 | goto version_mismatch; | |
360 | ctx->expect_skid = true; | |
2c7fd367 DH |
361 | break; |
362 | default: | |
363 | goto unsupported; | |
364 | } | |
365 | ||
366 | return 0; | |
367 | ||
368 | unsupported: | |
369 | pr_warn("Unsupported SignerInfo version\n"); | |
370 | return -EINVAL; | |
60d65cac DH |
371 | version_mismatch: |
372 | pr_warn("SignedData-SignerInfo version mismatch\n"); | |
373 | return -EBADMSG; | |
2c7fd367 DH |
374 | } |
375 | ||
2e3fadbf DH |
376 | /* |
377 | * Extract a certificate and store it in the context. | |
378 | */ | |
379 | int pkcs7_extract_cert(void *context, size_t hdrlen, | |
380 | unsigned char tag, | |
381 | const void *value, size_t vlen) | |
382 | { | |
383 | struct pkcs7_parse_context *ctx = context; | |
384 | struct x509_certificate *x509; | |
385 | ||
386 | if (tag != ((ASN1_UNIV << 6) | ASN1_CONS_BIT | ASN1_SEQ)) { | |
387 | pr_debug("Cert began with tag %02x at %lu\n", | |
388 | tag, (unsigned long)ctx - ctx->data); | |
389 | return -EBADMSG; | |
390 | } | |
391 | ||
392 | /* We have to correct for the header so that the X.509 parser can start | |
393 | * from the beginning. Note that since X.509 stipulates DER, there | |
394 | * probably shouldn't be an EOC trailer - but it is in PKCS#7 (which | |
395 | * stipulates BER). | |
396 | */ | |
397 | value -= hdrlen; | |
398 | vlen += hdrlen; | |
399 | ||
400 | if (((u8*)value)[1] == 0x80) | |
401 | vlen += 2; /* Indefinite length - there should be an EOC */ | |
402 | ||
403 | x509 = x509_cert_parse(value, vlen); | |
404 | if (IS_ERR(x509)) | |
405 | return PTR_ERR(x509); | |
406 | ||
2e3fadbf | 407 | x509->index = ++ctx->x509_index; |
46963b77 DH |
408 | pr_debug("Got cert %u for %s\n", x509->index, x509->subject); |
409 | pr_debug("- fingerprint %*phN\n", x509->id->len, x509->id->data); | |
410 | ||
2e3fadbf DH |
411 | *ctx->ppcerts = x509; |
412 | ctx->ppcerts = &x509->next; | |
413 | return 0; | |
414 | } | |
415 | ||
416 | /* | |
417 | * Save the certificate list | |
418 | */ | |
419 | int pkcs7_note_certificate_list(void *context, size_t hdrlen, | |
420 | unsigned char tag, | |
421 | const void *value, size_t vlen) | |
422 | { | |
423 | struct pkcs7_parse_context *ctx = context; | |
424 | ||
425 | pr_devel("Got cert list (%02x)\n", tag); | |
426 | ||
427 | *ctx->ppcerts = ctx->msg->certs; | |
428 | ctx->msg->certs = ctx->certs; | |
429 | ctx->certs = NULL; | |
430 | ctx->ppcerts = &ctx->certs; | |
431 | return 0; | |
432 | } | |
433 | ||
99db4435 DH |
434 | /* |
435 | * Note the content type. | |
436 | */ | |
437 | int pkcs7_note_content(void *context, size_t hdrlen, | |
438 | unsigned char tag, | |
439 | const void *value, size_t vlen) | |
440 | { | |
441 | struct pkcs7_parse_context *ctx = context; | |
442 | ||
443 | if (ctx->last_oid != OID_data && | |
444 | ctx->last_oid != OID_msIndirectData) { | |
445 | pr_warn("Unsupported data type %d\n", ctx->last_oid); | |
446 | return -EINVAL; | |
447 | } | |
448 | ||
449 | ctx->msg->data_type = ctx->last_oid; | |
450 | return 0; | |
451 | } | |
452 | ||
2e3fadbf DH |
453 | /* |
454 | * Extract the data from the message and store that and its content type OID in | |
455 | * the context. | |
456 | */ | |
457 | int pkcs7_note_data(void *context, size_t hdrlen, | |
458 | unsigned char tag, | |
459 | const void *value, size_t vlen) | |
460 | { | |
461 | struct pkcs7_parse_context *ctx = context; | |
462 | ||
463 | pr_debug("Got data\n"); | |
464 | ||
465 | ctx->msg->data = value; | |
466 | ctx->msg->data_len = vlen; | |
467 | ctx->msg->data_hdrlen = hdrlen; | |
2e3fadbf DH |
468 | return 0; |
469 | } | |
470 | ||
471 | /* | |
99db4435 | 472 | * Parse authenticated attributes. |
2e3fadbf DH |
473 | */ |
474 | int pkcs7_sig_note_authenticated_attr(void *context, size_t hdrlen, | |
475 | unsigned char tag, | |
476 | const void *value, size_t vlen) | |
477 | { | |
478 | struct pkcs7_parse_context *ctx = context; | |
99db4435 DH |
479 | struct pkcs7_signed_info *sinfo = ctx->sinfo; |
480 | enum OID content_type; | |
2e3fadbf DH |
481 | |
482 | pr_devel("AuthAttr: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value); | |
483 | ||
484 | switch (ctx->last_oid) { | |
99db4435 DH |
485 | case OID_contentType: |
486 | if (__test_and_set_bit(sinfo_has_content_type, &sinfo->aa_set)) | |
487 | goto repeated; | |
488 | content_type = look_up_OID(value, vlen); | |
489 | if (content_type != ctx->msg->data_type) { | |
490 | pr_warn("Mismatch between global data type (%d) and sinfo %u (%d)\n", | |
491 | ctx->msg->data_type, sinfo->index, | |
492 | content_type); | |
493 | return -EBADMSG; | |
494 | } | |
495 | return 0; | |
496 | ||
497 | case OID_signingTime: | |
498 | if (__test_and_set_bit(sinfo_has_signing_time, &sinfo->aa_set)) | |
499 | goto repeated; | |
500 | /* Should we check that the signing time is consistent | |
501 | * with the signer's X.509 cert? | |
502 | */ | |
503 | return x509_decode_time(&sinfo->signing_time, | |
504 | hdrlen, tag, value, vlen); | |
505 | ||
2e3fadbf | 506 | case OID_messageDigest: |
99db4435 DH |
507 | if (__test_and_set_bit(sinfo_has_message_digest, &sinfo->aa_set)) |
508 | goto repeated; | |
2e3fadbf DH |
509 | if (tag != ASN1_OTS) |
510 | return -EBADMSG; | |
99db4435 DH |
511 | sinfo->msgdigest = value; |
512 | sinfo->msgdigest_len = vlen; | |
513 | return 0; | |
514 | ||
515 | case OID_smimeCapabilites: | |
516 | if (__test_and_set_bit(sinfo_has_smime_caps, &sinfo->aa_set)) | |
517 | goto repeated; | |
518 | if (ctx->msg->data_type != OID_msIndirectData) { | |
519 | pr_warn("S/MIME Caps only allowed with Authenticode\n"); | |
520 | return -EKEYREJECTED; | |
521 | } | |
522 | return 0; | |
523 | ||
524 | /* Microsoft SpOpusInfo seems to be contain cont[0] 16-bit BE | |
525 | * char URLs and cont[1] 8-bit char URLs. | |
526 | * | |
527 | * Microsoft StatementType seems to contain a list of OIDs that | |
528 | * are also used as extendedKeyUsage types in X.509 certs. | |
529 | */ | |
530 | case OID_msSpOpusInfo: | |
531 | if (__test_and_set_bit(sinfo_has_ms_opus_info, &sinfo->aa_set)) | |
532 | goto repeated; | |
533 | goto authenticode_check; | |
534 | case OID_msStatementType: | |
535 | if (__test_and_set_bit(sinfo_has_ms_statement_type, &sinfo->aa_set)) | |
536 | goto repeated; | |
537 | authenticode_check: | |
538 | if (ctx->msg->data_type != OID_msIndirectData) { | |
539 | pr_warn("Authenticode AuthAttrs only allowed with Authenticode\n"); | |
540 | return -EKEYREJECTED; | |
541 | } | |
542 | /* I'm not sure how to validate these */ | |
2e3fadbf DH |
543 | return 0; |
544 | default: | |
545 | return 0; | |
546 | } | |
99db4435 DH |
547 | |
548 | repeated: | |
549 | /* We permit max one item per AuthenticatedAttribute and no repeats */ | |
550 | pr_warn("Repeated/multivalue AuthAttrs not permitted\n"); | |
551 | return -EKEYREJECTED; | |
2e3fadbf DH |
552 | } |
553 | ||
554 | /* | |
2c7fd367 | 555 | * Note the set of auth attributes for digestion purposes [RFC2315 sec 9.3] |
2e3fadbf DH |
556 | */ |
557 | int pkcs7_sig_note_set_of_authattrs(void *context, size_t hdrlen, | |
558 | unsigned char tag, | |
559 | const void *value, size_t vlen) | |
560 | { | |
561 | struct pkcs7_parse_context *ctx = context; | |
99db4435 DH |
562 | struct pkcs7_signed_info *sinfo = ctx->sinfo; |
563 | ||
564 | if (!test_bit(sinfo_has_content_type, &sinfo->aa_set) || | |
7ee7014d | 565 | !test_bit(sinfo_has_message_digest, &sinfo->aa_set)) { |
99db4435 DH |
566 | pr_warn("Missing required AuthAttr\n"); |
567 | return -EBADMSG; | |
568 | } | |
569 | ||
570 | if (ctx->msg->data_type != OID_msIndirectData && | |
571 | test_bit(sinfo_has_ms_opus_info, &sinfo->aa_set)) { | |
572 | pr_warn("Unexpected Authenticode AuthAttr\n"); | |
573 | return -EBADMSG; | |
574 | } | |
2e3fadbf DH |
575 | |
576 | /* We need to switch the 'CONT 0' to a 'SET OF' when we digest */ | |
99db4435 DH |
577 | sinfo->authattrs = value - (hdrlen - 1); |
578 | sinfo->authattrs_len = vlen + (hdrlen - 1); | |
2e3fadbf DH |
579 | return 0; |
580 | } | |
581 | ||
582 | /* | |
583 | * Note the issuing certificate serial number | |
584 | */ | |
585 | int pkcs7_sig_note_serial(void *context, size_t hdrlen, | |
586 | unsigned char tag, | |
587 | const void *value, size_t vlen) | |
588 | { | |
589 | struct pkcs7_parse_context *ctx = context; | |
46963b77 DH |
590 | ctx->raw_serial = value; |
591 | ctx->raw_serial_size = vlen; | |
2e3fadbf DH |
592 | return 0; |
593 | } | |
594 | ||
595 | /* | |
596 | * Note the issuer's name | |
597 | */ | |
598 | int pkcs7_sig_note_issuer(void *context, size_t hdrlen, | |
599 | unsigned char tag, | |
600 | const void *value, size_t vlen) | |
601 | { | |
602 | struct pkcs7_parse_context *ctx = context; | |
46963b77 DH |
603 | ctx->raw_issuer = value; |
604 | ctx->raw_issuer_size = vlen; | |
2e3fadbf DH |
605 | return 0; |
606 | } | |
607 | ||
60d65cac DH |
608 | /* |
609 | * Note the issuing cert's subjectKeyIdentifier | |
610 | */ | |
611 | int pkcs7_sig_note_skid(void *context, size_t hdrlen, | |
612 | unsigned char tag, | |
613 | const void *value, size_t vlen) | |
614 | { | |
615 | struct pkcs7_parse_context *ctx = context; | |
616 | ||
617 | pr_devel("SKID: %02x %zu [%*ph]\n", tag, vlen, (unsigned)vlen, value); | |
618 | ||
619 | ctx->raw_skid = value; | |
620 | ctx->raw_skid_size = vlen; | |
621 | return 0; | |
622 | } | |
623 | ||
2e3fadbf DH |
624 | /* |
625 | * Note the signature data | |
626 | */ | |
627 | int pkcs7_sig_note_signature(void *context, size_t hdrlen, | |
628 | unsigned char tag, | |
629 | const void *value, size_t vlen) | |
630 | { | |
631 | struct pkcs7_parse_context *ctx = context; | |
2e3fadbf | 632 | |
566a117a DH |
633 | ctx->sinfo->sig->s = kmemdup(value, vlen, GFP_KERNEL); |
634 | if (!ctx->sinfo->sig->s) | |
2e3fadbf DH |
635 | return -ENOMEM; |
636 | ||
566a117a | 637 | ctx->sinfo->sig->s_size = vlen; |
2e3fadbf DH |
638 | return 0; |
639 | } | |
640 | ||
641 | /* | |
642 | * Note a signature information block | |
643 | */ | |
644 | int pkcs7_note_signed_info(void *context, size_t hdrlen, | |
645 | unsigned char tag, | |
646 | const void *value, size_t vlen) | |
647 | { | |
648 | struct pkcs7_parse_context *ctx = context; | |
46963b77 DH |
649 | struct pkcs7_signed_info *sinfo = ctx->sinfo; |
650 | struct asymmetric_key_id *kid; | |
651 | ||
99db4435 DH |
652 | if (ctx->msg->data_type == OID_msIndirectData && !sinfo->authattrs) { |
653 | pr_warn("Authenticode requires AuthAttrs\n"); | |
654 | return -EBADMSG; | |
655 | } | |
656 | ||
46963b77 | 657 | /* Generate cert issuer + serial number key ID */ |
60d65cac DH |
658 | if (!ctx->expect_skid) { |
659 | kid = asymmetric_key_generate_id(ctx->raw_serial, | |
660 | ctx->raw_serial_size, | |
661 | ctx->raw_issuer, | |
662 | ctx->raw_issuer_size); | |
663 | } else { | |
664 | kid = asymmetric_key_generate_id(ctx->raw_skid, | |
665 | ctx->raw_skid_size, | |
666 | "", 0); | |
667 | } | |
46963b77 DH |
668 | if (IS_ERR(kid)) |
669 | return PTR_ERR(kid); | |
670 | ||
60d65cac DH |
671 | pr_devel("SINFO KID: %u [%*phN]\n", kid->len, kid->len, kid->data); |
672 | ||
566a117a | 673 | sinfo->sig->auth_ids[0] = kid; |
46963b77 DH |
674 | sinfo->index = ++ctx->sinfo_index; |
675 | *ctx->ppsinfo = sinfo; | |
676 | ctx->ppsinfo = &sinfo->next; | |
2e3fadbf DH |
677 | ctx->sinfo = kzalloc(sizeof(struct pkcs7_signed_info), GFP_KERNEL); |
678 | if (!ctx->sinfo) | |
679 | return -ENOMEM; | |
566a117a DH |
680 | ctx->sinfo->sig = kzalloc(sizeof(struct public_key_signature), |
681 | GFP_KERNEL); | |
682 | if (!ctx->sinfo->sig) | |
683 | return -ENOMEM; | |
2e3fadbf DH |
684 | return 0; |
685 | } |