1 /* $OpenBSD: cms_ess.c,v 1.21 2019/08/11 14:19:09 jsing Exp $ */
2 /*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 * project.
5 */
6 /* ====================================================================
7 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 */
54
55 #include <string.h>
56
57 #include "cryptlib.h"
58 #include <openssl/asn1t.h>
59 #include <openssl/pem.h>
60 #include <openssl/rand.h>
61 #include <openssl/x509v3.h>
62 #include <openssl/err.h>
63 #include <openssl/cms.h>
64 #include "cms_lcl.h"
65
66
67 CMS_ReceiptRequest *
d2i_CMS_ReceiptRequest(CMS_ReceiptRequest ** a,const unsigned char ** in,long len)68 d2i_CMS_ReceiptRequest(CMS_ReceiptRequest **a, const unsigned char **in, long len)
69 {
70 return (CMS_ReceiptRequest *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
71 &CMS_ReceiptRequest_it);
72 }
73
74 int
i2d_CMS_ReceiptRequest(CMS_ReceiptRequest * a,unsigned char ** out)75 i2d_CMS_ReceiptRequest(CMS_ReceiptRequest *a, unsigned char **out)
76 {
77 return ASN1_item_i2d((ASN1_VALUE *)a, out, &CMS_ReceiptRequest_it);
78 }
79
80 CMS_ReceiptRequest *
CMS_ReceiptRequest_new(void)81 CMS_ReceiptRequest_new(void)
82 {
83 return (CMS_ReceiptRequest *)ASN1_item_new(&CMS_ReceiptRequest_it);
84 }
85
86 void
CMS_ReceiptRequest_free(CMS_ReceiptRequest * a)87 CMS_ReceiptRequest_free(CMS_ReceiptRequest *a)
88 {
89 ASN1_item_free((ASN1_VALUE *)a, &CMS_ReceiptRequest_it);
90 }
91
92 /* ESS services: for now just Signed Receipt related */
93
94 int
CMS_get1_ReceiptRequest(CMS_SignerInfo * si,CMS_ReceiptRequest ** prr)95 CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
96 {
97 ASN1_STRING *str;
98 CMS_ReceiptRequest *rr = NULL;
99
100 if (prr)
101 *prr = NULL;
102 str = CMS_signed_get0_data_by_OBJ(si,
103 OBJ_nid2obj(NID_id_smime_aa_receiptRequest), -3, V_ASN1_SEQUENCE);
104 if (!str)
105 return 0;
106
107 rr = ASN1_item_unpack(str, &CMS_ReceiptRequest_it);
108 if (!rr)
109 return -1;
110 if (prr)
111 *prr = rr;
112 else
113 CMS_ReceiptRequest_free(rr);
114
115 return 1;
116 }
117
118 CMS_ReceiptRequest *
CMS_ReceiptRequest_create0(unsigned char * id,int idlen,int allorfirst,STACK_OF (GENERAL_NAMES)* receiptList,STACK_OF (GENERAL_NAMES)* receiptsTo)119 CMS_ReceiptRequest_create0(unsigned char *id, int idlen, int allorfirst,
120 STACK_OF(GENERAL_NAMES) *receiptList, STACK_OF(GENERAL_NAMES) *receiptsTo)
121 {
122 CMS_ReceiptRequest *rr = NULL;
123
124 rr = CMS_ReceiptRequest_new();
125 if (rr == NULL)
126 goto merr;
127 if (id)
128 ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
129 else {
130 if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL, 32))
131 goto merr;
132 arc4random_buf(rr->signedContentIdentifier->data, 32);
133 }
134
135 sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free);
136 rr->receiptsTo = receiptsTo;
137
138 if (receiptList) {
139 rr->receiptsFrom->type = 1;
140 rr->receiptsFrom->d.receiptList = receiptList;
141 } else {
142 rr->receiptsFrom->type = 0;
143 rr->receiptsFrom->d.allOrFirstTier = allorfirst;
144 }
145
146 return rr;
147
148 merr:
149 CMSerror(ERR_R_MALLOC_FAILURE);
150 CMS_ReceiptRequest_free(rr);
151
152 return NULL;
153 }
154
155 int
CMS_add1_ReceiptRequest(CMS_SignerInfo * si,CMS_ReceiptRequest * rr)156 CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
157 {
158 unsigned char *rrder = NULL;
159 int rrderlen, r = 0;
160
161 rrderlen = i2d_CMS_ReceiptRequest(rr, &rrder);
162 if (rrderlen < 0)
163 goto merr;
164
165 if (!CMS_signed_add1_attr_by_NID(si, NID_id_smime_aa_receiptRequest,
166 V_ASN1_SEQUENCE, rrder, rrderlen))
167 goto merr;
168
169 r = 1;
170
171 merr:
172 if (!r)
173 CMSerror(ERR_R_MALLOC_FAILURE);
174
175 free(rrder);
176
177 return r;
178 }
179
180 void
CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest * rr,ASN1_STRING ** pcid,int * pallorfirst,STACK_OF (GENERAL_NAMES)** plist,STACK_OF (GENERAL_NAMES)** prto)181 CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr, ASN1_STRING **pcid,
182 int *pallorfirst, STACK_OF(GENERAL_NAMES) **plist,
183 STACK_OF(GENERAL_NAMES) **prto)
184 {
185 if (pcid)
186 *pcid = rr->signedContentIdentifier;
187 if (rr->receiptsFrom->type == 0) {
188 if (pallorfirst)
189 *pallorfirst = (int)rr->receiptsFrom->d.allOrFirstTier;
190 if (plist)
191 *plist = NULL;
192 } else {
193 if (pallorfirst)
194 *pallorfirst = -1;
195 if (plist)
196 *plist = rr->receiptsFrom->d.receiptList;
197 }
198 if (prto)
199 *prto = rr->receiptsTo;
200 }
201
202 /* Digest a SignerInfo structure for msgSigDigest attribute processing */
203
204 static int
cms_msgSigDigest(CMS_SignerInfo * si,unsigned char * dig,unsigned int * diglen)205 cms_msgSigDigest(CMS_SignerInfo *si, unsigned char *dig, unsigned int *diglen)
206 {
207 const EVP_MD *md;
208
209 md = EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
210 if (md == NULL)
211 return 0;
212 if (!ASN1_item_digest(&CMS_Attributes_Verify_it, md,
213 si->signedAttrs, dig, diglen))
214 return 0;
215
216 return 1;
217 }
218
219 /* Add a msgSigDigest attribute to a SignerInfo */
220
221 int
cms_msgSigDigest_add1(CMS_SignerInfo * dest,CMS_SignerInfo * src)222 cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
223 {
224 unsigned char dig[EVP_MAX_MD_SIZE];
225 unsigned int diglen;
226
227 if (!cms_msgSigDigest(src, dig, &diglen)) {
228 CMSerror(CMS_R_MSGSIGDIGEST_ERROR);
229 return 0;
230 }
231 if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest,
232 V_ASN1_OCTET_STRING, dig, diglen)) {
233 CMSerror(ERR_R_MALLOC_FAILURE);
234 return 0;
235 }
236
237 return 1;
238 }
239
240 /* Verify signed receipt after it has already passed normal CMS verify */
241
242 int
cms_Receipt_verify(CMS_ContentInfo * cms,CMS_ContentInfo * req_cms)243 cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
244 {
245 int r = 0, i;
246 CMS_ReceiptRequest *rr = NULL;
247 CMS_Receipt *rct = NULL;
248 STACK_OF(CMS_SignerInfo) *sis, *osis;
249 CMS_SignerInfo *si, *osi = NULL;
250 ASN1_OCTET_STRING *msig, **pcont;
251 ASN1_OBJECT *octype;
252 unsigned char dig[EVP_MAX_MD_SIZE];
253 unsigned int diglen;
254
255 /* Get SignerInfos, also checks SignedData content type */
256 osis = CMS_get0_SignerInfos(req_cms);
257 sis = CMS_get0_SignerInfos(cms);
258 if (!osis || !sis)
259 goto err;
260
261 if (sk_CMS_SignerInfo_num(sis) != 1) {
262 CMSerror(CMS_R_NEED_ONE_SIGNER);
263 goto err;
264 }
265
266 /* Check receipt content type */
267 if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt) {
268 CMSerror(CMS_R_NOT_A_SIGNED_RECEIPT);
269 goto err;
270 }
271
272 /* Extract and decode receipt content */
273 pcont = CMS_get0_content(cms);
274 if (!pcont || !*pcont) {
275 CMSerror(CMS_R_NO_CONTENT);
276 goto err;
277 }
278
279 rct = ASN1_item_unpack(*pcont, &CMS_Receipt_it);
280
281 if (!rct) {
282 CMSerror(CMS_R_RECEIPT_DECODE_ERROR);
283 goto err;
284 }
285
286 /* Locate original request */
287
288 for (i = 0; i < sk_CMS_SignerInfo_num(osis); i++) {
289 osi = sk_CMS_SignerInfo_value(osis, i);
290 if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
291 break;
292 }
293
294 if (i == sk_CMS_SignerInfo_num(osis)) {
295 CMSerror(CMS_R_NO_MATCHING_SIGNATURE);
296 goto err;
297 }
298
299 si = sk_CMS_SignerInfo_value(sis, 0);
300
301 /* Get msgSigDigest value and compare */
302
303 msig = CMS_signed_get0_data_by_OBJ(si,
304 OBJ_nid2obj(NID_id_smime_aa_msgSigDigest), -3, V_ASN1_OCTET_STRING);
305
306 if (!msig) {
307 CMSerror(CMS_R_NO_MSGSIGDIGEST);
308 goto err;
309 }
310
311 if (!cms_msgSigDigest(osi, dig, &diglen)) {
312 CMSerror(CMS_R_MSGSIGDIGEST_ERROR);
313 goto err;
314 }
315
316 if (diglen != (unsigned int)msig->length) {
317 CMSerror(CMS_R_MSGSIGDIGEST_WRONG_LENGTH);
318 goto err;
319 }
320
321 if (memcmp(dig, msig->data, diglen)) {
322 CMSerror(CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE);
323 goto err;
324 }
325
326 /* Compare content types */
327
328 octype = CMS_signed_get0_data_by_OBJ(osi,
329 OBJ_nid2obj(NID_pkcs9_contentType), -3, V_ASN1_OBJECT);
330 if (!octype) {
331 CMSerror(CMS_R_NO_CONTENT_TYPE);
332 goto err;
333 }
334
335 /* Compare details in receipt request */
336
337 if (OBJ_cmp(octype, rct->contentType)) {
338 CMSerror(CMS_R_CONTENT_TYPE_MISMATCH);
339 goto err;
340 }
341
342 /* Get original receipt request details */
343
344 if (CMS_get1_ReceiptRequest(osi, &rr) <= 0) {
345 CMSerror(CMS_R_NO_RECEIPT_REQUEST);
346 goto err;
347 }
348
349 if (ASN1_STRING_cmp(rr->signedContentIdentifier,
350 rct->signedContentIdentifier)) {
351 CMSerror(CMS_R_CONTENTIDENTIFIER_MISMATCH);
352 goto err;
353 }
354
355 r = 1;
356
357 err:
358 CMS_ReceiptRequest_free(rr);
359 ASN1_item_free((ASN1_VALUE *)rct, &CMS_Receipt_it);
360 return r;
361 }
362
363 /*
364 * Encode a Receipt into an OCTET STRING read for including into content of a
365 * SignedData ContentInfo.
366 */
367
368 ASN1_OCTET_STRING *
cms_encode_Receipt(CMS_SignerInfo * si)369 cms_encode_Receipt(CMS_SignerInfo *si)
370 {
371 CMS_Receipt rct;
372 CMS_ReceiptRequest *rr = NULL;
373 ASN1_OBJECT *ctype;
374 ASN1_OCTET_STRING *os = NULL;
375
376 /* Get original receipt request */
377
378 /* Get original receipt request details */
379
380 if (CMS_get1_ReceiptRequest(si, &rr) <= 0) {
381 CMSerror(CMS_R_NO_RECEIPT_REQUEST);
382 goto err;
383 }
384
385 /* Get original content type */
386
387 ctype = CMS_signed_get0_data_by_OBJ(si,
388 OBJ_nid2obj(NID_pkcs9_contentType), -3, V_ASN1_OBJECT);
389 if (!ctype) {
390 CMSerror(CMS_R_NO_CONTENT_TYPE);
391 goto err;
392 }
393
394 rct.version = 1;
395 rct.contentType = ctype;
396 rct.signedContentIdentifier = rr->signedContentIdentifier;
397 rct.originatorSignatureValue = si->signature;
398
399 os = ASN1_item_pack(&rct, &CMS_Receipt_it, NULL);
400
401 err:
402 CMS_ReceiptRequest_free(rr);
403 return os;
404 }
405