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8c6afbc5 RP |
1 | /* |
2 | * Written by Rob Stradling (rob@comodo.com) and Stephen Henson | |
3 | * (steve@openssl.org) for the OpenSSL project 2014. | |
4 | */ | |
5 | /* ==================================================================== | |
6 | * Copyright (c) 2014 The OpenSSL Project. All rights reserved. | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * licensing@OpenSSL.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | * This product includes cryptographic software written by Eric Young | |
54 | * (eay@cryptsoft.com). This product includes software written by Tim | |
55 | * Hudson (tjh@cryptsoft.com). | |
56 | * | |
57 | */ | |
58 | ||
59 | #include <string.h> | |
60 | ||
61 | #include <openssl/ct.h> | |
62 | #include <openssl/err.h> | |
63 | #include <openssl/evp.h> | |
64 | #include <openssl/x509.h> | |
65 | ||
66 | #include "ct_locl.h" | |
67 | ||
8c6afbc5 RP |
68 | typedef enum sct_signature_type_t { |
69 | SIGNATURE_TYPE_NOT_SET = -1, | |
70 | SIGNATURE_TYPE_CERT_TIMESTAMP, | |
71 | SIGNATURE_TYPE_TREE_HASH | |
72 | } SCT_SIGNATURE_TYPE; | |
73 | ||
74 | /* | |
75 | * Update encoding for SCT signature verification/generation to supplied | |
76 | * EVP_MD_CTX. | |
77 | */ | |
78 | static int sct_ctx_update(EVP_MD_CTX *ctx, const SCT_CTX *sctx, const SCT *sct) | |
79 | { | |
80 | unsigned char tmpbuf[12]; | |
81 | unsigned char *p, *der; | |
82 | size_t derlen; | |
0dfd6cf9 RP |
83 | /*+ |
84 | * digitally-signed struct { | |
85 | * (1 byte) Version sct_version; | |
86 | * (1 byte) SignatureType signature_type = certificate_timestamp; | |
87 | * (8 bytes) uint64 timestamp; | |
88 | * (2 bytes) LogEntryType entry_type; | |
89 | * (? bytes) select(entry_type) { | |
90 | * case x509_entry: ASN.1Cert; | |
91 | * case precert_entry: PreCert; | |
92 | * } signed_entry; | |
93 | * (2 bytes + sct->ext_len) CtExtensions extensions; | |
94 | * } | |
8c6afbc5 | 95 | */ |
8c6afbc5 RP |
96 | if (sct->entry_type == CT_LOG_ENTRY_TYPE_NOT_SET) |
97 | return 0; | |
8c6afbc5 RP |
98 | if (sct->entry_type == CT_LOG_ENTRY_TYPE_PRECERT && sctx->ihash == NULL) |
99 | return 0; | |
100 | ||
101 | p = tmpbuf; | |
8c6afbc5 RP |
102 | *p++ = sct->version; |
103 | *p++ = SIGNATURE_TYPE_CERT_TIMESTAMP; | |
104 | l2n8(sct->timestamp, p); | |
105 | s2n(sct->entry_type, p); | |
106 | ||
107 | if (!EVP_DigestUpdate(ctx, tmpbuf, p - tmpbuf)) | |
108 | return 0; | |
109 | ||
110 | if (sct->entry_type == CT_LOG_ENTRY_TYPE_X509) { | |
111 | der = sctx->certder; | |
112 | derlen = sctx->certderlen; | |
113 | } else { | |
114 | if (!EVP_DigestUpdate(ctx, sctx->ihash, sctx->ihashlen)) | |
115 | return 0; | |
116 | der = sctx->preder; | |
117 | derlen = sctx->prederlen; | |
118 | } | |
119 | ||
120 | /* If no encoding available, fatal error */ | |
121 | if (der == NULL) | |
122 | return 0; | |
123 | ||
124 | /* Include length first */ | |
125 | p = tmpbuf; | |
126 | l2n3(derlen, p); | |
127 | ||
128 | if (!EVP_DigestUpdate(ctx, tmpbuf, 3)) | |
129 | return 0; | |
130 | if (!EVP_DigestUpdate(ctx, der, derlen)) | |
131 | return 0; | |
132 | ||
133 | /* Add any extensions */ | |
134 | p = tmpbuf; | |
135 | s2n(sct->ext_len, p); | |
136 | if (!EVP_DigestUpdate(ctx, tmpbuf, 2)) | |
137 | return 0; | |
138 | ||
139 | if (sct->ext_len && !EVP_DigestUpdate(ctx, sct->ext, sct->ext_len)) | |
140 | return 0; | |
141 | ||
142 | return 1; | |
143 | } | |
144 | ||
145 | int SCT_verify(const SCT_CTX *sctx, const SCT *sct) | |
146 | { | |
147 | EVP_MD_CTX *ctx = NULL; | |
70073f3e | 148 | int ret = 0; |
0dfd6cf9 | 149 | |
8c6afbc5 RP |
150 | if (!SCT_is_complete(sct) || sctx->pkey == NULL || |
151 | sct->entry_type == CT_LOG_ENTRY_TYPE_NOT_SET || | |
152 | (sct->entry_type == CT_LOG_ENTRY_TYPE_PRECERT && sctx->ihash == NULL)) { | |
153 | CTerr(CT_F_SCT_VERIFY, CT_R_SCT_NOT_SET); | |
70073f3e | 154 | return 0; |
8c6afbc5 RP |
155 | } |
156 | if (sct->version != SCT_VERSION_V1) { | |
157 | CTerr(CT_F_SCT_VERIFY, CT_R_SCT_UNSUPPORTED_VERSION); | |
158 | return 0; | |
159 | } | |
160 | if (sct->log_id_len != sctx->pkeyhashlen || | |
161 | memcmp(sct->log_id, sctx->pkeyhash, sctx->pkeyhashlen) != 0) { | |
162 | CTerr(CT_F_SCT_VERIFY, CT_R_SCT_LOG_ID_MISMATCH); | |
163 | return 0; | |
164 | } | |
0dfd6cf9 | 165 | |
8c6afbc5 RP |
166 | ctx = EVP_MD_CTX_new(); |
167 | if (ctx == NULL) | |
168 | goto end; | |
169 | ||
170 | if (!EVP_DigestVerifyInit(ctx, NULL, EVP_sha256(), NULL, sctx->pkey)) | |
171 | goto end; | |
172 | ||
173 | if (!sct_ctx_update(ctx, sctx, sct)) | |
174 | goto end; | |
175 | ||
176 | /* Verify signature */ | |
177 | ret = EVP_DigestVerifyFinal(ctx, sct->sig, sct->sig_len); | |
178 | /* If ret < 0 some other error: fall through without setting error */ | |
179 | if (ret == 0) | |
180 | CTerr(CT_F_SCT_VERIFY, CT_R_SCT_INVALID_SIGNATURE); | |
181 | ||
0dfd6cf9 | 182 | end: |
8c6afbc5 RP |
183 | EVP_MD_CTX_free(ctx); |
184 | return ret; | |
185 | } | |
186 | ||
187 | int SCT_verify_v1(SCT *sct, X509 *cert, X509 *preissuer, | |
188 | X509_PUBKEY *log_pubkey, X509 *issuer_cert) | |
189 | { | |
190 | int ret = 0; | |
191 | SCT_CTX *sctx = NULL; | |
192 | ||
0dfd6cf9 | 193 | if (!SCT_is_complete(sct)) { |
8c6afbc5 | 194 | CTerr(CT_F_SCT_VERIFY_V1, CT_R_SCT_NOT_SET); |
70073f3e | 195 | return 0; |
0dfd6cf9 RP |
196 | } |
197 | ||
198 | if (sct->version != 0) { | |
8c6afbc5 RP |
199 | CTerr(CT_F_SCT_VERIFY_V1, CT_R_SCT_UNSUPPORTED_VERSION); |
200 | return 0; | |
201 | } | |
202 | ||
203 | sctx = SCT_CTX_new(); | |
204 | if (sctx == NULL) | |
205 | goto done; | |
206 | ||
70073f3e | 207 | if (!SCT_CTX_set1_pubkey(sctx, log_pubkey)) |
8c6afbc5 RP |
208 | goto done; |
209 | ||
70073f3e | 210 | if (!SCT_CTX_set1_cert(sctx, cert, preissuer)) |
8c6afbc5 RP |
211 | goto done; |
212 | ||
70073f3e RP |
213 | if (sct->entry_type == CT_LOG_ENTRY_TYPE_PRECERT && |
214 | !SCT_CTX_set1_issuer(sctx, issuer_cert)) | |
215 | goto done; | |
8c6afbc5 RP |
216 | |
217 | ret = SCT_verify(sctx, sct); | |
0dfd6cf9 RP |
218 | done: |
219 | SCT_CTX_free(sctx); | |
8c6afbc5 RP |
220 | return ret; |
221 | } |