Bug Summary

File:src/lib/libcrypto/cms/cms_ess.c
Warning:line 209, column 7
Access to field 'digestAlgorithm' results in a dereference of a null pointer (loaded from variable 'si')

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name cms_ess.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/lib/libcrypto/obj -resource-dir /usr/local/lib/clang/13.0.0 -D LIBRESSL_INTERNAL -D LIBRESSL_CRYPTO_INTERNAL -D DSO_DLFCN -D HAVE_DLFCN_H -D HAVE_FUNOPEN -D OPENSSL_NO_HW_PADLOCK -I /usr/src/lib/libcrypto -I /usr/src/lib/libcrypto/asn1 -I /usr/src/lib/libcrypto/bio -I /usr/src/lib/libcrypto/bn -I /usr/src/lib/libcrypto/bytestring -I /usr/src/lib/libcrypto/dh -I /usr/src/lib/libcrypto/dsa -I /usr/src/lib/libcrypto/ec -I /usr/src/lib/libcrypto/ecdh -I /usr/src/lib/libcrypto/ecdsa -I /usr/src/lib/libcrypto/evp -I /usr/src/lib/libcrypto/hmac -I /usr/src/lib/libcrypto/modes -I /usr/src/lib/libcrypto/ocsp -I /usr/src/lib/libcrypto/rsa -I /usr/src/lib/libcrypto/x509 -I /usr/src/lib/libcrypto/obj -D AES_ASM -D BSAES_ASM -D VPAES_ASM -D OPENSSL_IA32_SSE2 -D RSA_ASM -D OPENSSL_BN_ASM_MONT -D OPENSSL_BN_ASM_MONT5 -D OPENSSL_BN_ASM_GF2m -D MD5_ASM -D GHASH_ASM -D RC4_MD5_ASM -D SHA1_ASM -D SHA256_ASM -D SHA512_ASM -D WHIRLPOOL_ASM -D OPENSSL_CPUID_OBJ -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libcrypto/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/lib/libcrypto/cms/cms_ess.c
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
67CMS_ReceiptRequest *
68d2i_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
74int
75i2d_CMS_ReceiptRequest(CMS_ReceiptRequest *a, unsigned char **out)
76{
77 return ASN1_item_i2d((ASN1_VALUE *)a, out, &CMS_ReceiptRequest_it);
78}
79
80CMS_ReceiptRequest *
81CMS_ReceiptRequest_new(void)
82{
83 return (CMS_ReceiptRequest *)ASN1_item_new(&CMS_ReceiptRequest_it);
84}
85
86void
87CMS_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
94int
95CMS_get1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest **prr)
96{
97 ASN1_STRING *str;
98 CMS_ReceiptRequest *rr = NULL((void*)0);
99
100 if (prr)
101 *prr = NULL((void*)0);
102 str = CMS_signed_get0_data_by_OBJ(si,
103 OBJ_nid2obj(NID_id_smime_aa_receiptRequest212), -3, V_ASN1_SEQUENCE16);
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
118CMS_ReceiptRequest *
119CMS_ReceiptRequest_create0(unsigned char *id, int idlen, int allorfirst,
120 STACK_OF(GENERAL_NAMES)struct stack_st_GENERAL_NAMES *receiptList, STACK_OF(GENERAL_NAMES)struct stack_st_GENERAL_NAMES *receiptsTo)
121{
122 CMS_ReceiptRequest *rr = NULL((void*)0);
123
124 rr = CMS_ReceiptRequest_new();
125 if (rr == NULL((void*)0))
126 goto merr;
127 if (id)
128 ASN1_STRING_set0(rr->signedContentIdentifier, id, idlen);
129 else {
130 if (!ASN1_STRING_set(rr->signedContentIdentifier, NULL((void*)0), 32))
131 goto merr;
132 arc4random_buf(rr->signedContentIdentifier->data, 32);
133 }
134
135 sk_GENERAL_NAMES_pop_free(rr->receiptsTo, GENERAL_NAMES_free)sk_pop_free(((_STACK*) (1 ? (rr->receiptsTo) : (struct stack_st_GENERAL_NAMES
*)0)), ((void (*)(void *)) ((1 ? (GENERAL_NAMES_free) : (void
(*)(GENERAL_NAMES *))0))));
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)ERR_put_error(46,(0xfff),((1|64)),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,149);
150 CMS_ReceiptRequest_free(rr);
151
152 return NULL((void*)0);
153}
154
155int
156CMS_add1_ReceiptRequest(CMS_SignerInfo *si, CMS_ReceiptRequest *rr)
157{
158 unsigned char *rrder = NULL((void*)0);
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_receiptRequest212,
166 V_ASN1_SEQUENCE16, rrder, rrderlen))
167 goto merr;
168
169 r = 1;
170
171 merr:
172 if (!r)
173 CMSerror(ERR_R_MALLOC_FAILURE)ERR_put_error(46,(0xfff),((1|64)),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,173);
174
175 free(rrder);
176
177 return r;
178}
179
180void
181CMS_ReceiptRequest_get0_values(CMS_ReceiptRequest *rr, ASN1_STRING **pcid,
182 int *pallorfirst, STACK_OF(GENERAL_NAMES)struct stack_st_GENERAL_NAMES **plist,
183 STACK_OF(GENERAL_NAMES)struct stack_st_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((void*)0);
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
204static int
205cms_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)EVP_get_digestbyname(OBJ_nid2sn(OBJ_obj2nid(si->digestAlgorithm
->algorithm)));
26
←
Access to field 'digestAlgorithm' results in a dereference of a null pointer (loaded from variable 'si')
210 if (md == NULL((void*)0))
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
221int
222cms_msgSigDigest_add1(CMS_SignerInfo *dest, CMS_SignerInfo *src)
223{
224 unsigned char dig[EVP_MAX_MD_SIZE64];
225 unsigned int diglen;
226
227 if (!cms_msgSigDigest(src, dig, &diglen)) {
228 CMSerror(CMS_R_MSGSIGDIGEST_ERROR)ERR_put_error(46,(0xfff),(172),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,228);
229 return 0;
230 }
231 if (!CMS_signed_add1_attr_by_NID(dest, NID_id_smime_aa_msgSigDigest216,
232 V_ASN1_OCTET_STRING4, dig, diglen)) {
233 CMSerror(ERR_R_MALLOC_FAILURE)ERR_put_error(46,(0xfff),((1|64)),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,233);
234 return 0;
235 }
236
237 return 1;
238}
239
240/* Verify signed receipt after it has already passed normal CMS verify */
241
242int
243cms_Receipt_verify(CMS_ContentInfo *cms, CMS_ContentInfo *req_cms)
244{
245 int r = 0, i;
246 CMS_ReceiptRequest *rr = NULL((void*)0);
247 CMS_Receipt *rct = NULL((void*)0);
248 STACK_OF(CMS_SignerInfo)struct stack_st_CMS_SignerInfo *sis, *osis;
249 CMS_SignerInfo *si, *osi = NULL((void*)0);
1
'osi' initialized to a null pointer value
→
250 ASN1_OCTET_STRING *msig, **pcont;
251 ASN1_OBJECT *octype;
252 unsigned char dig[EVP_MAX_MD_SIZE64];
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)
2
←
Assuming 'osis' is non-null
→
3
←
Assuming 'sis' is non-null
→
4
←
Taking false branch
→
259 goto err;
260
261 if (sk_CMS_SignerInfo_num(sis)sk_num(((_STACK*) (1 ? (sis) : (struct stack_st_CMS_SignerInfo
*)0))) != 1) {
5
←
'?' condition is true
→
6
←
Assuming the condition is false
→
7
←
Taking false branch
→
262 CMSerror(CMS_R_NEED_ONE_SIGNER)ERR_put_error(46,(0xfff),(164),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,262);
263 goto err;
264 }
265
266 /* Check receipt content type */
267 if (OBJ_obj2nid(CMS_get0_eContentType(cms)) != NID_id_smime_ct_receipt204) {
8
←
Assuming the condition is false
→
9
←
Taking false branch
→
268 CMSerror(CMS_R_NOT_A_SIGNED_RECEIPT)ERR_put_error(46,(0xfff),(165),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,268);
269 goto err;
270 }
271
272 /* Extract and decode receipt content */
273 pcont = CMS_get0_content(cms);
274 if (!pcont || !*pcont) {
10
←
Assuming 'pcont' is non-null
→
11
←
Assuming the condition is false
→
12
←
Taking false branch
→
275 CMSerror(CMS_R_NO_CONTENT)ERR_put_error(46,(0xfff),(127),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,275);
276 goto err;
277 }
278
279 rct = ASN1_item_unpack(*pcont, &CMS_Receipt_it);
280
281 if (!rct) {
13
←
Assuming 'rct' is non-null
→
14
←
Taking false branch
→
282 CMSerror(CMS_R_RECEIPT_DECODE_ERROR)ERR_put_error(46,(0xfff),(169),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,282);
283 goto err;
284 }
285
286 /* Locate original request */
287
288 for (i = 0; i < sk_CMS_SignerInfo_num(osis)sk_num(((_STACK*) (1 ? (osis) : (struct stack_st_CMS_SignerInfo
*)0))); i++) {
15
←
'?' condition is true
→
16
←
Assuming the condition is false
→
17
←
Loop condition is false. Execution continues on line 294
→
289 osi = sk_CMS_SignerInfo_value(osis, i)((CMS_SignerInfo *)sk_value(((_STACK*) (1 ? (osis) : (struct stack_st_CMS_SignerInfo
*)0)), (i)));
290 if (!ASN1_STRING_cmp(osi->signature, rct->originatorSignatureValue))
291 break;
292 }
293
294 if (i == sk_CMS_SignerInfo_num(osis)sk_num(((_STACK*) (1 ? (osis) : (struct stack_st_CMS_SignerInfo
*)0)))) {
18
←
'?' condition is true
→
19
←
Assuming the condition is false
→
20
←
Taking false branch
→
295 CMSerror(CMS_R_NO_MATCHING_SIGNATURE)ERR_put_error(46,(0xfff),(166),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,295);
296 goto err;
297 }
298
299 si = sk_CMS_SignerInfo_value(sis, 0)((CMS_SignerInfo *)sk_value(((_STACK*) (1 ? (sis) : (struct stack_st_CMS_SignerInfo
*)0)), (0)));
21
←
'?' condition is true
→
300
301 /* Get msgSigDigest value and compare */
302
303 msig = CMS_signed_get0_data_by_OBJ(si,
304 OBJ_nid2obj(NID_id_smime_aa_msgSigDigest216), -3, V_ASN1_OCTET_STRING4);
305
306 if (!msig) {
22
←
Assuming 'msig' is non-null
→
23
←
Taking false branch
→
307 CMSerror(CMS_R_NO_MSGSIGDIGEST)ERR_put_error(46,(0xfff),(167),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,307);
308 goto err;
309 }
310
311 if (!cms_msgSigDigest(osi, dig, &diglen)) {
24
←
Passing null pointer value via 1st parameter 'si'
→
25
←
Calling 'cms_msgSigDigest'
→
312 CMSerror(CMS_R_MSGSIGDIGEST_ERROR)ERR_put_error(46,(0xfff),(172),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,312);
313 goto err;
314 }
315
316 if (diglen != (unsigned int)msig->length) {
317 CMSerror(CMS_R_MSGSIGDIGEST_WRONG_LENGTH)ERR_put_error(46,(0xfff),(163),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,317);
318 goto err;
319 }
320
321 if (memcmp(dig, msig->data, diglen)) {
322 CMSerror(CMS_R_MSGSIGDIGEST_VERIFICATION_FAILURE)ERR_put_error(46,(0xfff),(162),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,322);
323 goto err;
324 }
325
326 /* Compare content types */
327
328 octype = CMS_signed_get0_data_by_OBJ(osi,
329 OBJ_nid2obj(NID_pkcs9_contentType50), -3, V_ASN1_OBJECT6);
330 if (!octype) {
331 CMSerror(CMS_R_NO_CONTENT_TYPE)ERR_put_error(46,(0xfff),(173),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,331);
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)ERR_put_error(46,(0xfff),(171),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,338);
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)ERR_put_error(46,(0xfff),(168),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,345);
346 goto err;
347 }
348
349 if (ASN1_STRING_cmp(rr->signedContentIdentifier,
350 rct->signedContentIdentifier)) {
351 CMSerror(CMS_R_CONTENTIDENTIFIER_MISMATCH)ERR_put_error(46,(0xfff),(170),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,351);
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
368ASN1_OCTET_STRING *
369cms_encode_Receipt(CMS_SignerInfo *si)
370{
371 CMS_Receipt rct;
372 CMS_ReceiptRequest *rr = NULL((void*)0);
373 ASN1_OBJECT *ctype;
374 ASN1_OCTET_STRING *os = NULL((void*)0);
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)ERR_put_error(46,(0xfff),(168),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,381);
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_contentType50), -3, V_ASN1_OBJECT6);
389 if (!ctype) {
390 CMSerror(CMS_R_NO_CONTENT_TYPE)ERR_put_error(46,(0xfff),(173),"/usr/src/lib/libcrypto/cms/cms_ess.c"
,390);
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((void*)0));
400
401 err:
402 CMS_ReceiptRequest_free(rr);
403 return os;
404}