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 goto merr;
126 if (id)
127 ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
128 else {
129 if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
130 goto merr;
131 if (RAND_bytes_ex(libctx, rr->signedContentIdentifier->data, 32,
132 0) <= 0)
133 goto err;
134 }
135
136 sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
137 rr->receiptsTo = receiptsTo;
138
139 if (receiptList != NULL) {
140 rr->receiptsFrom->type = 1;
141 rr->receiptsFrom->d.receiptList = receiptList;
142 } else {
143 rr->receiptsFrom->type = 0;
144 rr->receiptsFrom->d.allOrFirstTier = allorfirst;
145 }
146
147 return rr;
148
149 merr:
150 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
151
152 err:
153 CMS_ReceiptRequest_free(rr);
154 return NULL;
155
156 }
157
CMS_ReceiptRequest_create0(unsigned char * id,int idlen,int allorfirst,STACK_OF (GENERAL_NAMES)* receiptList,STACK_OF (GENERAL_NAMES)* receiptsTo)158 CMS_ReceiptRequest *CMS_ReceiptRequest_create0(
159 unsigned char *id, int idlen, int allorfirst,
160 STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo)
161 {
162 return CMS_ReceiptRequest_create0_ex(id, idlen, allorfirst, receiptList,
163 receiptsTo, NULL);
164 }
165
CMS_add1_ReceiptRequest(CMS_SignerInfo * si,CMS_ReceiptRequest * rr)166 int CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
167 {
168 unsigned char *rrder = NULL;
169 int rrderlen, r = 0;
170
171 rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
172 if (rrderlen < 0)
173 goto merr;
174
175 if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
176 V_ASN1_SEQUENCE, rrder, rrderlen))
177 goto merr;
178
179 r = 1;
180
181 merr:
182 if (!r)
183 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
184
185 OPENSSL_free(rrder);
186
187 return r;
188
189 }
190
CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest * rr,ASN1_STRING ** pcid,int * pallorfirst,STACK_OF (GENERAL_NAMES)** plist,STACK_OF (GENERAL_NAMES)** prto)191 void CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr,
192 ASN1_STRING **pcid,
193 int *pallorfirst,
194 STACK_OF(GENERAL_NAMES) **plist,
195 STACK_OF(GENERAL_NAMES) **prto)
196 {
197 if (pcid != NULL)
198 *pcid = rr->signedContentIdentifier;
199 if (rr->receiptsFrom->type == 0) {
200 if (pallorfirst != NULL)
201 *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
202 if (plist != NULL)
203 *plist = NULL;
204 } else {
205 if (pallorfirst != NULL)
206 *pallorfirst = -1;
207 if (plist != NULL)
208 *plist = rr->receiptsFrom->d.receiptList;
209 }
210 if (prto != NULL)
211 *prto = rr->receiptsTo;
212 }
213
214 /* Digest a SignerInfo structure for msgSigDigest attribute processing */
215
cms_msgSigDigest(CMS_SignerInfo * si,unsigned char * dig,unsigned int * diglen)216 static int cms_msgSigDigest(CMS_SignerInfo *si,
217 unsigned char *dig, unsigned int *diglen)
218 {
219 const EVP_MD *md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
220
221 if (md == NULL)
222 return 0;
223 if (!ossl_asn1_item_digest_ex(ASN1_ITEM_rptr(CMS_Attributes_Verify), md,
224 si->signedAttrs, dig, diglen,
225 ossl_cms_ctx_get0_libctx(si->cms_ctx),
226 ossl_cms_ctx_get0_propq(si->cms_ctx)))
227 return 0;
228 return 1;
229 }
230
231 /* Add a msgSigDigest attribute to a SignerInfo */
232
ossl_cms_msgSigDigest_add1(CMS_SignerInfo * dest,CMS_SignerInfo * src)233 int ossl_cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
234 {
235 unsigned char dig[EVP_MAX_MD_SIZE];
236 unsigned int diglen;
237
238 if (!cms_msgSigDigest(src, dig, &diglen)) {
239 ERR_raise(ERR_LIB_CMS, CMS_R_MSGSIGDIGEST_ERROR);
240 return 0;
241 }
242 if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
243 V_ASN1_OCTET_STRING, dig, diglen)) {
244 ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
245 return 0;
246 }
247 return 1;
248 }
249
250 /* Verify signed receipt after it has already passed normal CMS verify */
251
ossl_cms_Receipt_verify(CMS_ContentInfo * cms,CMS_ContentInfo * req_cms)252 int ossl_cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
253 {
254 int r = 0, i;
255 CMS_ReceiptRequest *rr = NULL;
256 CMS_Receipt *rct = NULL;
257 STACK_OF(CMS_SignerInfo) *sis, *osis;
258 CMS_SignerInfo *si, *osi = NULL;
259 ASN1_OCTET_STRING *msig, **pcont;
260 ASN1_OBJECT *octype;
261 unsigned char dig[EVP_MAX_MD_SIZE];
262 unsigned int diglen;
263
264 /* Get SignerInfos, also checks SignedData content type */
265 osis = CMS_get0_SignerInfos(req_cms);
266 sis = CMS_get0_SignerInfos(cms);
267 if (!osis || !sis)
268 goto err;
269
270 if (sk_CMS_SignerInfo_num(sis) != 1) {
271 ERR_raise(ERR_LIB_CMS, CMS_R_NEED_ONE_SIGNER);
272 goto err;
273 }
274
275 /* Check receipt content type */
276 if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
277 ERR_raise(ERR_LIB_CMS, CMS_R_NOT_A_SIGNED_RECEIPT);
278 goto err;
279 }
280
281 /* Extract and decode receipt content */
282 pcont = CMS_get0_content(cms);
283 if (pcont == NULL || *pcont == NULL) {
284 ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT);
285 goto err;
286 }
287
288 rct = ASN1_item_unpack(*pcont, ASN1_ITEM_rptr(CMS_Receipt));
289
290 if (!rct) {
291 ERR_raise(ERR_LIB_CMS, CMS_R_RECEIPT_DECODE_ERROR);
292 goto err;
293 }
294
295 /* Locate original request */
296
297 for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
298 osi = sk_CMS_SignerInfo_value(osis, i);
299 if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
300 break;
301 }
302
303 if (i == sk_CMS_SignerInfo_num(osis)) {
304 ERR_raise(ERR_LIB_CMS, CMS_R_NO_MATCHING_SIGNATURE);
305 goto err;
306 }
307
308 si = sk_CMS_SignerInfo_value(sis, 0);
309
310 /* Get msgSigDigest value and compare */
311
312 msig = CMS_signed_get0_data_by_OBJ(si,
313 OBJ_nid2obj
314 (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 /*
377 * Encode a Receipt into an OCTET STRING read for including into content of a
378 * SignedData ContentInfo.
379 */
380
ossl_cms_encode_Receipt(CMS_SignerInfo * si)381 ASN1_OCTET_STRING *ossl_cms_encode_Receipt(CMS_SignerInfo *si)
382 {
383 CMS_Receipt rct;
384 CMS_ReceiptRequest *rr = NULL;
385 ASN1_OBJECT *ctype;
386 ASN1_OCTET_STRING *os = NULL;
387
388 /* Get original receipt request */
389
390 /* Get original receipt request details */
391
392 if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
393 ERR_raise(ERR_LIB_CMS, CMS_R_NO_RECEIPT_REQUEST);
394 goto err;
395 }
396
397 /* Get original content type */
398
399 ctype = CMS_signed_get0_data_by_OBJ(si,
400 OBJ_nid2obj(NID_pkcs9_contentType),
401 -3, V_ASN1_OBJECT);
402 if (!ctype) {
403 ERR_raise(ERR_LIB_CMS, CMS_R_NO_CONTENT_TYPE);
404 goto err;
405 }
406
407 rct.version = 1;
408 rct.contentType = ctype;
409 rct.signedContentIdentifier = rr->signedContentIdentifier;
410 rct.originatorSignatureValue = si->signature;
411
412 os = ASN1_item_pack(&rct, ASN1_ITEM_rptr(CMS_Receipt), NULL);
413
414 err:
415 CMS_ReceiptRequest_free(rr);
416 return os;
417 }
418