1 /*
2 * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include "internal/cryptlib.h"
11 #include <openssl/asn1t.h>
12 #include <openssl/pem.h>
13 #include <openssl/rand.h>
14 #include <openssl/x509v3.h>
15 #include <openssl/err.h>
16 #include <openssl/cms.h>
17 #include <openssl/ess.h>
18 #include "crypto/ess.h"
19 #include "crypto/x509.h"
20 #include "cms_local.h"
21
IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest)22 IMPLEMENT_ASN1_FUNCTIONS(CMS_ReceiptRequest)
23
24 /* ESS services */
25
26 int CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
27 {
28 ASN1_STRING *str;
29 CMS_ReceiptRequest *rr;
30 ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_receiptRequest);
31
32 if (prr != NULL)
33 *prr = NULL;
34 str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
35 if (str == NULL)
36 return 0;
37
38 rr = ASN1_item_unpack(str, ASN1_ITEM_rptr(CMS_ReceiptRequest));
39 if (rr == NULL)
40 return -1;
41 if (prr != NULL)
42 *prr = rr;
43 else
44 CMS_ReceiptRequest_free(rr);
45 return 1;
46 }
47
48 /*
49 * Returns 0 if attribute is not found, 1 if found,
50 * or -1 on attribute parsing failure.
51 */
ossl_cms_signerinfo_get_signing_cert(const CMS_SignerInfo * si,ESS_SIGNING_CERT ** psc)52 static int ossl_cms_signerinfo_get_signing_cert(const CMS_SignerInfo *si,
53 ESS_SIGNING_CERT **psc)
54 {
55 ASN1_STRING *str;
56 ESS_SIGNING_CERT *sc;
57 ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificate);
58
59 if (psc != NULL)
60 *psc = NULL;
61 str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
62 if (str == NULL)
63 return 0;
64
65 sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT));
66 if (sc == NULL)
67 return -1;
68 if (psc != NULL)
69 *psc = sc;
70 else
71 ESS_SIGNING_CERT_free(sc);
72 return 1;
73 }
74
75 /*
76 * Returns 0 if attribute is not found, 1 if found,
77 * or -1 on attribute parsing failure.
78 */
ossl_cms_signerinfo_get_signing_cert_v2(const CMS_SignerInfo * si,ESS_SIGNING_CERT_V2 ** psc)79 static int ossl_cms_signerinfo_get_signing_cert_v2(const CMS_SignerInfo *si,
80 ESS_SIGNING_CERT_V2 **psc)
81 {
82 ASN1_STRING *str;
83 ESS_SIGNING_CERT_V2 *sc;
84 ASN1_OBJECT *obj = OBJ_nid2obj(NID_id_smime_aa_signingCertificateV2);
85
86 if (psc != NULL)
87 *psc = NULL;
88 str = CMS_signed_get0_data_by_OBJ(si, obj, -3, V_ASN1_SEQUENCE);
89 if (str == NULL)
90 return 0;
91
92 sc = ASN1_item_unpack(str, ASN1_ITEM_rptr(ESS_SIGNING_CERT_V2));
93 if (sc == NULL)
94 return -1;
95 if (psc != NULL)
96 *psc = sc;
97 else
98 ESS_SIGNING_CERT_V2_free(sc);
99 return 1;
100 }
101
ossl_cms_check_signing_certs(const CMS_SignerInfo * si,const STACK_OF (X509)* chain)102 int ossl_cms_check_signing_certs(const CMS_SignerInfo *si,
103 const STACK_OF(X509) *chain)
104 {
105 ESS_SIGNING_CERT *ss = NULL;
106 ESS_SIGNING_CERT_V2 *ssv2 = NULL;
107 int ret = ossl_cms_signerinfo_get_signing_cert(si, &ss) >= 0
108 && ossl_cms_signerinfo_get_signing_cert_v2(si, &ssv2) >= 0
109 && OSSL_ESS_check_signing_certs(ss, ssv2, chain, 1) > 0;
110
111 ESS_SIGNING_CERT_free(ss);
112 ESS_SIGNING_CERT_V2_free(ssv2);
113 return ret;
114 }
115
CMS_ReceiptRequest_create0_ex(unsigned char * id,int idlen,int allorfirst,STACK_OF (GENERAL_NAMES)* receiptList,STACK_OF (GENERAL_NAMES)* receiptsTo,OSSL_LIB_CTX * libctx)116 CMS_ReceiptRequest *CMS_ReceiptRequest_create0_ex(
117 unsigned char *id, int idlen, int allorfirst,
118 STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo,
119 OSSL_LIB_CTX *libctx)
120 {
121 CMS_ReceiptRequest *rr;
122
123 rr = CMS_ReceiptRequest_new();
124 if (rr == NULL) {
125 ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
126 goto err;
127 }
128 if (id)
129 ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
130 else {
131 if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32)) {
132 ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
133 goto err;
134 }
135 if (RAND_bytes_ex(libctx, rr->signedContentIdentifier->data, 32,
136 0)
137 <= 0)
138 goto err;
139 }
140
141 sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
142 rr->receiptsTo = receiptsTo;
143
144 if (receiptList != NULL) {
145 rr->receiptsFrom->type = 1;
146 rr->receiptsFrom->d.receiptList = receiptList;
147 } else {
148 rr->receiptsFrom->type = 0;
149 rr->receiptsFrom->d.allOrFirstTier = allorfirst;
150 }
151
152 return rr;
153
154 err:
155 CMS_ReceiptRequest_free(rr);
156 return NULL;
157 }
158
CMS_ReceiptRequest_create0(unsigned char * id,int idlen,int allorfirst,STACK_OF (GENERAL_NAMES)* receiptList,STACK_OF (GENERAL_NAMES)* receiptsTo)159 CMS_ReceiptRequest *CMS_ReceiptRequest_create0(
160 unsigned char *id, int idlen, int allorfirst,
161 STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo)
162 {
163 return CMS_ReceiptRequest_create0_ex(id, idlen, allorfirst, receiptList,
164 receiptsTo, NULL);
165 }
166
CMS_add1_ReceiptRequest(CMS_SignerInfo * si,CMS_ReceiptRequest * rr)167 int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
168 {
169 unsigned char *rrder = NULL;
170 int rrderlen, r = 0;
171
172 rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
173 if (rrderlen < 0) {
174 ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
175 goto err;
176 }
177
178 if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
179 V_ASN1_SEQUENCE, rrder, rrderlen)) {
180 ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
181 goto err;
182 }
183
184 r = 1;
185
186 err:
187 OPENSSL_free(rrder);
188
189 return r;
190 }
191
CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest * rr,ASN1_STRING ** pcid,int * pallorfirst,STACK_OF (GENERAL_NAMES)** plist,STACK_OF (GENERAL_NAMES)** prto)192 void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
193 ASN1_STRING **pcid,
194 int *pallorfirst,
195 STACK_OF(GENERAL_NAMES) **plist,
196 STACK_OF(GENERAL_NAMES) **prto)
197 {
198 if (pcid != NULL)
199 *pcid = rr->signedContentIdentifier;
200 if (rr->receiptsFrom->type == 0) {
201 if (pallorfirst != NULL)
202 *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
203 if (plist != NULL)
204 *plist = NULL;
205 } else {
206 if (pallorfirst != NULL)
207 *pallorfirst = -1;
208 if (plist != NULL)
209 *plist = rr->receiptsFrom->d.receiptList;
210 }
211 if (prto != NULL)
212 *prto = rr->receiptsTo;
213 }
214
215 /* Digest a SignerInfo structure for msgSigDigest attribute processing */
216
cms_msgSigDigest(CMS_SignerInfo * si,unsigned char * dig,unsigned int * diglen)217 static int cms_msgSigDigest(CMS_SignerInfo *si,
218 unsigned char *dig, unsigned int *diglen)
219 {
220 const EVP_MD *md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
221
222 if (md == NULL)
223 return 0;
224 if (!ossl_asn1_item_digest_ex(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
225 si->signedAttrs, dig, diglen,
226 ossl_cms_ctx_get0_libctx(si->cms_ctx),
227 ossl_cms_ctx_get0_propq(si->cms_ctx)))
228 return 0;
229 return 1;
230 }
231
232 /* Add a msgSigDigest attribute to a SignerInfo */
233
ossl_cms_msgSigDigest_add1(CMS_SignerInfo * dest,CMS_SignerInfo * src)234 int ossl_cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
235 {
236 unsigned char dig[EVP_MAX_MD_SIZE];
237 unsigned int diglen;
238
239 if (!cms_msgSigDigest(src, dig, &diglen)) {
240 ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
241 return 0;
242 }
243 if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
244 V_ASN1_OCTET_STRING, dig, diglen)) {
245 ERR_raise(ERR_LIB_CMS, ERR_R_CMS_LIB);
246 return 0;
247 }
248 return 1;
249 }
250
251 /* Verify signed receipt after it has already passed normal CMS verify */
252
ossl_cms_Receipt_verify(CMS_ContentInfo * cms,CMS_ContentInfo * req_cms)253 int ossl_cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
254 {
255 int r = 0, i;
256 CMS_ReceiptRequest *rr = NULL;
257 CMS_Receipt *rct = NULL;
258 STACK_OF(CMS_SignerInfo) *sis, *osis;
259 CMS_SignerInfo *si, *osi = NULL;
260 ASN1_OCTET_STRING *msig, **pcont;
261 ASN1_OBJECT *octype;
262 unsigned char dig[EVP_MAX_MD_SIZE];
263 unsigned int diglen;
264
265 /* Get SignerInfos, also checks SignedData content type */
266 osis = CMS_get0_SignerInfos(req_cms);
267 sis = CMS_get0_SignerInfos(cms);
268 if (!osis || !sis)
269 goto err;
270
271 if (sk_CMS_SignerInfo_num(sis) != 1) {
272 ERR_raise(ERR_LIB_CMS, CMS_R_NEED_ONE_SIGNER);
273 goto err;
274 }
275
276 /* Check receipt content type */
277 if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
278 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_A_SIGNED_RECEIPT);
279 goto err;
280 }
281
282 /* Extract and decode receipt content */
283 pcont = CMS_get0_content(cms);
284 if (pcont == NULL || *pcont == NULL) {
285 ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
286 goto err;
287 }
288
289 rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));
290
291 if (!rct) {
292 ERR_raise(ERR_LIB_CMS, CMS_R_RECEIPT_DECODE_ERROR);
293 goto err;
294 }
295
296 /* Locate original request */
297
298 for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
299 osi = sk_CMS_SignerInfo_value(osis, i);
300 if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
301 break;
302 }
303
304 if (i == sk_CMS_SignerInfo_num(osis)) {
305 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_SIGNATURE);
306 goto err;
307 }
308
309 si = sk_CMS_SignerInfo_value(sis, 0);
310
311 /* Get msgSigDigest value and compare */
312
313 msig = CMS_signed_get0_data_by_OBJ(si,
314 OBJ_nid2obj(NID_id_smime_aa_msgSigDigest), -3,
315 V_ASN1_OCTET_STRING);
316
317 if (!msig) {
318 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MSGSIGDIGEST);
319 goto err;
320 }
321
322 if (!cms_msgSigDigest(osi, dig, &diglen)) {
323 ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
324 goto err;
325 }
326
327 if (diglen != (unsigned int)msig->length) {
328 ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
329 goto err;
330 }
331
332 if (memcmp(dig, msig->data, diglen)) {
333 ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
334 goto err;
335 }
336
337 /* Compare content types */
338
339 octype = CMS_signed_get0_data_by_OBJ(osi,
340 OBJ_nid2obj(NID_pkcs9_contentType),
341 -3, V_ASN1_OBJECT);
342 if (!octype) {
343 ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
344 goto err;
345 }
346
347 /* Compare details in receipt request */
348
349 if (OBJ_cmp(octype, rct->contentType)) {
350 ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_MISMATCH);
351 goto err;
352 }
353
354 /* Get original receipt request details */
355
356 if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
357 ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
358 goto err;
359 }
360
361 if (ASN1_STRING_cmp(rr->signedContentIdentifier,
362 rct->signedContentIdentifier)) {
363 ERR_raise(ERR_LIB_CMS, CMS_R_CONTENTIDENTIFIER_MISMATCH);
364 goto err;
365 }
366
367 r = 1;
368
369 err:
370 CMS_ReceiptRequest_free(rr);
371 M_ASN1_free_of(rct, CMS_Receipt);
372 return r;
373 }
374
375 /*
376 * Encode a Receipt into an OCTET STRING read for including into content of a
377 * SignedData ContentInfo.
378 */
379
ossl_cms_encode_Receipt(CMS_SignerInfo * si)380 ASN1_OCTET_STRING *ossl_cms_encode_Receipt(CMS_SignerInfo *si)
381 {
382 CMS_Receipt rct;
383 CMS_ReceiptRequest *rr = NULL;
384 ASN1_OBJECT *ctype;
385 ASN1_OCTET_STRING *os = NULL;
386
387 /* Get original receipt request */
388
389 /* Get original receipt request details */
390
391 if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
392 ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
393 goto err;
394 }
395
396 /* Get original content type */
397
398 ctype = CMS_signed_get0_data_by_OBJ(si,
399 OBJ_nid2obj(NID_pkcs9_contentType),
400 -3, V_ASN1_OBJECT);
401 if (!ctype) {
402 ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
403 goto err;
404 }
405
406 rct.version = 1;
407 rct.contentType = ctype;
408 rct.signedContentIdentifier = rr->signedContentIdentifier;
409 rct.originatorSignatureValue = si->signature;
410
411 os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);
412
413 err:
414 CMS_ReceiptRequest_free(rr);
415 return os;
416 }
417