1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* Written by Rob Percival (robpercival@google.com) for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 2016 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*/
#include <stddef.h>
#include <openssl/ct.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/safestack.h>
/*
* From RFC6962: opaque SerializedSCT<1..2^16-1>; struct { SerializedSCT
* sct_list <1..2^16-1>; } SignedCertificateTimestampList;
*/
# define MAX_SCT_SIZE 65535
# define MAX_SCT_LIST_SIZE MAX_SCT_SIZE
/*
* Macros to read and write integers in network-byte order.
*/
#define n2s(c,s) ((s=(((unsigned int)((c)[0]))<< 8)| \
(((unsigned int)((c)[1])) )),c+=2)
#define s2n(s,c) ((c[0]=(unsigned char)(((s)>> 8)&0xff), \
c[1]=(unsigned char)(((s) )&0xff)),c+=2)
#define l2n3(l,c) ((c[0]=(unsigned char)(((l)>>16)&0xff), \
c[1]=(unsigned char)(((l)>> 8)&0xff), \
c[2]=(unsigned char)(((l) )&0xff)),c+=3)
#define n2l8(c,l) (l =((uint64_t)(*((c)++)))<<56, \
l|=((uint64_t)(*((c)++)))<<48, \
l|=((uint64_t)(*((c)++)))<<40, \
l|=((uint64_t)(*((c)++)))<<32, \
l|=((uint64_t)(*((c)++)))<<24, \
l|=((uint64_t)(*((c)++)))<<16, \
l|=((uint64_t)(*((c)++)))<< 8, \
l|=((uint64_t)(*((c)++))))
#define l2n8(l,c) (*((c)++)=(unsigned char)(((l)>>56)&0xff), \
*((c)++)=(unsigned char)(((l)>>48)&0xff), \
*((c)++)=(unsigned char)(((l)>>40)&0xff), \
*((c)++)=(unsigned char)(((l)>>32)&0xff), \
*((c)++)=(unsigned char)(((l)>>24)&0xff), \
*((c)++)=(unsigned char)(((l)>>16)&0xff), \
*((c)++)=(unsigned char)(((l)>> 8)&0xff), \
*((c)++)=(unsigned char)(((l) )&0xff))
/* Signed Certificate Timestamp */
struct sct_st {
sct_version_t version;
/* If version is not SCT_VERSION_V1, this contains the encoded SCT */
unsigned char *sct;
size_t sct_len;
/* If version is SCT_VERSION_V1, fields below contain components of the SCT */
unsigned char *log_id;
size_t log_id_len;
/*
* Note, we cannot distinguish between an unset timestamp, and one
* that is set to 0. However since CT didn't exist in 1970, no real
* SCT should ever be set as such.
*/
uint64_t timestamp;
unsigned char *ext;
size_t ext_len;
unsigned char hash_alg;
unsigned char sig_alg;
unsigned char *sig;
size_t sig_len;
/* Log entry type */
ct_log_entry_type_t entry_type;
/* Where this SCT was found, e.g. certificate, OCSP response, etc. */
sct_source_t source;
/* The result of the last attempt to validate this SCT. */
sct_validation_status_t validation_status;
};
/* Miscellaneous data that is useful when verifying an SCT */
struct sct_ctx_st {
/* Public key */
EVP_PKEY *pkey;
/* Hash of public key */
unsigned char *pkeyhash;
size_t pkeyhashlen;
/* For pre-certificate: issuer public key hash */
unsigned char *ihash;
size_t ihashlen;
/* certificate encoding */
unsigned char *certder;
size_t certderlen;
/* pre-certificate encoding */
unsigned char *preder;
size_t prederlen;
};
/* Context when evaluating whether a Certificate Transparency policy is met */
struct ct_policy_eval_ctx_st {
X509 *cert;
X509 *issuer;
CTLOG_STORE *log_store;
STACK_OF(SCT) *good_scts;
STACK_OF(SCT) *bad_scts;
};
/*
* Creates a new context for verifying an SCT.
*/
SCT_CTX *SCT_CTX_new(void);
/*
* Deletes an SCT verification context.
*/
void SCT_CTX_free(SCT_CTX *sctx);
/*
* Sets the certificate that the SCT was created for.
* If *cert does not have a poison extension, presigner must be NULL.
* If *cert does not have a poison extension, it may have a single SCT
* (NID_ct_precert_scts) extension.
* If either *cert or *presigner have an AKID (NID_authority_key_identifier)
* extension, both must have one.
* Returns 1 on success, 0 on failure.
*/
__owur int SCT_CTX_set1_cert(SCT_CTX *sctx, X509 *cert, X509 *presigner);
/*
* Sets the issuer of the certificate that the SCT was created for.
* This is just a convenience method to save extracting the public key and
* calling SCT_CTX_set1_issuer_pubkey().
* Issuer must not be NULL.
* Returns 1 on success, 0 on failure.
*/
__owur int SCT_CTX_set1_issuer(SCT_CTX *sctx, const X509 *issuer);
/*
* Sets the public key of the issuer of the certificate that the SCT was created
* for.
* The public key must not be NULL.
* Returns 1 on success, 0 on failure.
*/
__owur int SCT_CTX_set1_issuer_pubkey(SCT_CTX *sctx, X509_PUBKEY *pubkey);
/*
* Sets the public key of the CT log that the SCT is from.
* Returns 1 on success, 0 on failure.
*/
__owur int SCT_CTX_set1_pubkey(SCT_CTX *sctx, X509_PUBKEY *pubkey);
/*
* Does this SCT have the minimum fields populated to be usable?
* Returns 1 if so, 0 otherwise.
*/
__owur int SCT_is_complete(const SCT *sct);
/*
* Does this SCT have the signature-related fields populated?
* Returns 1 if so, 0 otherwise.
* This checks that the signature and hash algorithms are set to supported
* values and that the signature field is set.
*/
__owur int SCT_signature_is_complete(const SCT *sct);
/*
* Handlers for Certificate Transparency X509v3/OCSP extensions
*/
extern const X509V3_EXT_METHOD v3_ct_scts[];
|
