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d2e9e320 | 1 | /* |
a28d06f3 | 2 | * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved. |
8c6afbc5 | 3 | * |
5477e842 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
d2e9e320 RS |
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 | |
8c6afbc5 RP |
8 | */ |
9 | ||
0dfd6cf9 RP |
10 | #include <stdlib.h> |
11 | #include <string.h> | |
12 | ||
8c6afbc5 RP |
13 | #include <openssl/conf.h> |
14 | #include <openssl/ct.h> | |
15 | #include <openssl/err.h> | |
16 | #include <openssl/evp.h> | |
17 | #include <openssl/safestack.h> | |
18 | ||
19 | #include "internal/cryptlib.h" | |
20 | ||
21 | /* | |
22 | * Information about a CT log server. | |
23 | */ | |
24 | struct ctlog_st { | |
b4250010 | 25 | OSSL_LIB_CTX *libctx; |
d4b2bfba | 26 | char *propq; |
8c6afbc5 RP |
27 | char *name; |
28 | uint8_t log_id[CT_V1_HASHLEN]; | |
29 | EVP_PKEY *public_key; | |
30 | }; | |
31 | ||
32 | /* | |
33 | * A store for multiple CTLOG instances. | |
34 | * It takes ownership of any CTLOG instances added to it. | |
35 | */ | |
36 | struct ctlog_store_st { | |
b4250010 | 37 | OSSL_LIB_CTX *libctx; |
d4b2bfba | 38 | char *propq; |
8c6afbc5 RP |
39 | STACK_OF(CTLOG) *logs; |
40 | }; | |
41 | ||
42 | /* The context when loading a CT log list from a CONF file. */ | |
43 | typedef struct ctlog_store_load_ctx_st { | |
44 | CTLOG_STORE *log_store; | |
45 | CONF *conf; | |
a930afb6 | 46 | size_t invalid_log_entries; |
8c6afbc5 RP |
47 | } CTLOG_STORE_LOAD_CTX; |
48 | ||
49 | /* | |
50 | * Creates an empty context for loading a CT log store. | |
51 | * It should be populated before use. | |
52 | */ | |
91860165 | 53 | static CTLOG_STORE_LOAD_CTX *ctlog_store_load_ctx_new(void); |
8c6afbc5 RP |
54 | |
55 | /* | |
56 | * Deletes a CT log store load context. | |
57 | * Does not delete any of the fields. | |
58 | */ | |
0dfd6cf9 | 59 | static void ctlog_store_load_ctx_free(CTLOG_STORE_LOAD_CTX* ctx); |
8c6afbc5 | 60 | |
3cb7c5cf | 61 | static CTLOG_STORE_LOAD_CTX *ctlog_store_load_ctx_new(void) |
8c6afbc5 | 62 | { |
0dfd6cf9 RP |
63 | CTLOG_STORE_LOAD_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx)); |
64 | ||
8c6afbc5 | 65 | return ctx; |
8c6afbc5 RP |
66 | } |
67 | ||
0dfd6cf9 | 68 | static void ctlog_store_load_ctx_free(CTLOG_STORE_LOAD_CTX* ctx) |
8c6afbc5 | 69 | { |
8c6afbc5 RP |
70 | OPENSSL_free(ctx); |
71 | } | |
72 | ||
73 | /* Converts a log's public key into a SHA256 log ID */ | |
d4b2bfba | 74 | static int ct_v1_log_id_from_pkey(CTLOG *log, EVP_PKEY *pkey) |
8c6afbc5 RP |
75 | { |
76 | int ret = 0; | |
77 | unsigned char *pkey_der = NULL; | |
78 | int pkey_der_len = i2d_PUBKEY(pkey, &pkey_der); | |
85d843c8 | 79 | unsigned int len; |
d4b2bfba | 80 | EVP_MD *sha256 = NULL; |
0dfd6cf9 | 81 | |
8c6afbc5 | 82 | if (pkey_der_len <= 0) { |
9311d0c4 | 83 | ERR_raise(ERR_LIB_CT, CT_R_LOG_KEY_INVALID); |
8c6afbc5 RP |
84 | goto err; |
85 | } | |
d4b2bfba MC |
86 | sha256 = EVP_MD_fetch(log->libctx, "SHA2-256", log->propq); |
87 | if (sha256 == NULL) { | |
c5689319 | 88 | ERR_raise(ERR_LIB_CT, ERR_R_EVP_LIB); |
d4b2bfba MC |
89 | goto err; |
90 | } | |
0dfd6cf9 | 91 | |
d4b2bfba MC |
92 | ret = EVP_Digest(pkey_der, pkey_der_len, log->log_id, &len, sha256, |
93 | NULL); | |
8c6afbc5 | 94 | err: |
d4b2bfba | 95 | EVP_MD_free(sha256); |
8c6afbc5 RP |
96 | OPENSSL_free(pkey_der); |
97 | return ret; | |
98 | } | |
99 | ||
b4250010 | 100 | CTLOG_STORE *CTLOG_STORE_new_ex(OSSL_LIB_CTX *libctx, const char *propq) |
8c6afbc5 | 101 | { |
0dfd6cf9 RP |
102 | CTLOG_STORE *ret = OPENSSL_zalloc(sizeof(*ret)); |
103 | ||
e077455e | 104 | if (ret == NULL) |
e57036f2 | 105 | return NULL; |
0dfd6cf9 | 106 | |
d4b2bfba MC |
107 | ret->libctx = libctx; |
108 | if (propq != NULL) { | |
109 | ret->propq = OPENSSL_strdup(propq); | |
e077455e | 110 | if (ret->propq == NULL) |
d4b2bfba | 111 | goto err; |
d4b2bfba MC |
112 | } |
113 | ||
8c6afbc5 | 114 | ret->logs = sk_CTLOG_new_null(); |
d4b2bfba | 115 | if (ret->logs == NULL) { |
e077455e | 116 | ERR_raise(ERR_LIB_CT, ERR_R_CRYPTO_LIB); |
8c6afbc5 | 117 | goto err; |
d4b2bfba | 118 | } |
0dfd6cf9 | 119 | |
8c6afbc5 RP |
120 | return ret; |
121 | err: | |
d4b2bfba | 122 | CTLOG_STORE_free(ret); |
8c6afbc5 RP |
123 | return NULL; |
124 | } | |
125 | ||
d4b2bfba MC |
126 | CTLOG_STORE *CTLOG_STORE_new(void) |
127 | { | |
d8652be0 | 128 | return CTLOG_STORE_new_ex(NULL, NULL); |
d4b2bfba MC |
129 | } |
130 | ||
8c6afbc5 RP |
131 | void CTLOG_STORE_free(CTLOG_STORE *store) |
132 | { | |
133 | if (store != NULL) { | |
d4b2bfba | 134 | OPENSSL_free(store->propq); |
8c6afbc5 RP |
135 | sk_CTLOG_pop_free(store->logs, CTLOG_free); |
136 | OPENSSL_free(store); | |
137 | } | |
138 | } | |
139 | ||
d4b2bfba MC |
140 | static int ctlog_new_from_conf(CTLOG_STORE *store, CTLOG **ct_log, |
141 | const CONF *conf, const char *section) | |
8c6afbc5 | 142 | { |
e57036f2 | 143 | const char *description = NCONF_get_string(conf, section, "description"); |
8c6afbc5 | 144 | char *pkey_base64; |
8c6afbc5 RP |
145 | |
146 | if (description == NULL) { | |
9311d0c4 | 147 | ERR_raise(ERR_LIB_CT, CT_R_LOG_CONF_MISSING_DESCRIPTION); |
4aed8756 | 148 | return 0; |
8c6afbc5 RP |
149 | } |
150 | ||
151 | pkey_base64 = NCONF_get_string(conf, section, "key"); | |
8c6afbc5 | 152 | if (pkey_base64 == NULL) { |
9311d0c4 | 153 | ERR_raise(ERR_LIB_CT, CT_R_LOG_CONF_MISSING_KEY); |
4aed8756 | 154 | return 0; |
8c6afbc5 RP |
155 | } |
156 | ||
d8652be0 MC |
157 | return CTLOG_new_from_base64_ex(ct_log, pkey_base64, description, |
158 | store->libctx, store->propq); | |
8c6afbc5 RP |
159 | } |
160 | ||
161 | int CTLOG_STORE_load_default_file(CTLOG_STORE *store) | |
162 | { | |
5c39a55d | 163 | const char *fpath = ossl_safe_getenv(CTLOG_FILE_EVP); |
0dfd6cf9 | 164 | |
8c6afbc5 RP |
165 | if (fpath == NULL) |
166 | fpath = CTLOG_FILE; | |
0dfd6cf9 | 167 | |
8c6afbc5 RP |
168 | return CTLOG_STORE_load_file(store, fpath); |
169 | } | |
170 | ||
a930afb6 | 171 | /* |
4aed8756 F |
172 | * Called by CONF_parse_list, which stops if this returns <= 0, |
173 | * Otherwise, one bad log entry would stop loading of any of | |
174 | * the following log entries. | |
175 | * It may stop parsing and returns -1 on any internal (malloc) error. | |
a930afb6 RP |
176 | */ |
177 | static int ctlog_store_load_log(const char *log_name, int log_name_len, | |
178 | void *arg) | |
8c6afbc5 RP |
179 | { |
180 | CTLOG_STORE_LOAD_CTX *load_ctx = arg; | |
e57036f2 | 181 | CTLOG *ct_log = NULL; |
8c6afbc5 | 182 | /* log_name may not be null-terminated, so fix that before using it */ |
2508c047 | 183 | char *tmp; |
4aed8756 | 184 | int ret = 0; |
0dfd6cf9 | 185 | |
2508c047 RP |
186 | /* log_name will be NULL for empty list entries */ |
187 | if (log_name == NULL) | |
188 | return 1; | |
189 | ||
190 | tmp = OPENSSL_strndup(log_name, log_name_len); | |
e57036f2 | 191 | if (tmp == NULL) |
e077455e | 192 | return -1; |
e57036f2 | 193 | |
d4b2bfba | 194 | ret = ctlog_new_from_conf(load_ctx->log_store, &ct_log, load_ctx->conf, tmp); |
8c6afbc5 | 195 | OPENSSL_free(tmp); |
4aed8756 F |
196 | |
197 | if (ret < 0) { | |
198 | /* Propagate any internal error */ | |
199 | return ret; | |
200 | } | |
201 | if (ret == 0) { | |
a930afb6 RP |
202 | /* If we can't load this log, record that fact and skip it */ |
203 | ++load_ctx->invalid_log_entries; | |
204 | return 1; | |
205 | } | |
8c6afbc5 | 206 | |
68efafc5 | 207 | if (!sk_CTLOG_push(load_ctx->log_store->logs, ct_log)) { |
e077455e RL |
208 | CTLOG_free(ct_log); |
209 | ERR_raise(ERR_LIB_CT, ERR_R_CRYPTO_LIB); | |
210 | return -1; | |
68efafc5 | 211 | } |
8c6afbc5 RP |
212 | return 1; |
213 | } | |
214 | ||
215 | int CTLOG_STORE_load_file(CTLOG_STORE *store, const char *file) | |
216 | { | |
a930afb6 | 217 | int ret = 0; |
8c6afbc5 | 218 | char *enabled_logs; |
0dfd6cf9 RP |
219 | CTLOG_STORE_LOAD_CTX* load_ctx = ctlog_store_load_ctx_new(); |
220 | ||
d3c3dfc5 | 221 | if (load_ctx == NULL) |
9be34ee5 | 222 | return 0; |
8c6afbc5 RP |
223 | load_ctx->log_store = store; |
224 | load_ctx->conf = NCONF_new(NULL); | |
225 | if (load_ctx->conf == NULL) | |
226 | goto end; | |
227 | ||
70073f3e | 228 | if (NCONF_load(load_ctx->conf, file, NULL) <= 0) { |
9311d0c4 | 229 | ERR_raise(ERR_LIB_CT, CT_R_LOG_CONF_INVALID); |
8c6afbc5 RP |
230 | goto end; |
231 | } | |
232 | ||
233 | enabled_logs = NCONF_get_string(load_ctx->conf, NULL, "enabled_logs"); | |
0c6ea565 | 234 | if (enabled_logs == NULL) { |
9311d0c4 | 235 | ERR_raise(ERR_LIB_CT, CT_R_LOG_CONF_INVALID); |
0c6ea565 RP |
236 | goto end; |
237 | } | |
238 | ||
70073f3e RP |
239 | if (!CONF_parse_list(enabled_logs, ',', 1, ctlog_store_load_log, load_ctx) || |
240 | load_ctx->invalid_log_entries > 0) { | |
9311d0c4 | 241 | ERR_raise(ERR_LIB_CT, CT_R_LOG_CONF_INVALID); |
a930afb6 RP |
242 | goto end; |
243 | } | |
8c6afbc5 | 244 | |
70073f3e | 245 | ret = 1; |
8c6afbc5 RP |
246 | end: |
247 | NCONF_free(load_ctx->conf); | |
0dfd6cf9 | 248 | ctlog_store_load_ctx_free(load_ctx); |
8c6afbc5 RP |
249 | return ret; |
250 | } | |
251 | ||
252 | /* | |
253 | * Initialize a new CTLOG object. | |
254 | * Takes ownership of the public key. | |
255 | * Copies the name. | |
256 | */ | |
b4250010 | 257 | CTLOG *CTLOG_new_ex(EVP_PKEY *public_key, const char *name, OSSL_LIB_CTX *libctx, |
d8652be0 | 258 | const char *propq) |
8c6afbc5 | 259 | { |
1ccbe6b3 | 260 | CTLOG *ret = OPENSSL_zalloc(sizeof(*ret)); |
0dfd6cf9 | 261 | |
e077455e | 262 | if (ret == NULL) |
e57036f2 | 263 | return NULL; |
0dfd6cf9 | 264 | |
d4b2bfba MC |
265 | ret->libctx = libctx; |
266 | if (propq != NULL) { | |
163bf682 | 267 | ret->propq = OPENSSL_strdup(propq); |
e077455e | 268 | if (ret->propq == NULL) |
d4b2bfba | 269 | goto err; |
d4b2bfba MC |
270 | } |
271 | ||
8c6afbc5 | 272 | ret->name = OPENSSL_strdup(name); |
e077455e | 273 | if (ret->name == NULL) |
8c6afbc5 | 274 | goto err; |
0dfd6cf9 | 275 | |
d4b2bfba | 276 | if (ct_v1_log_id_from_pkey(ret, public_key) != 1) |
8c6afbc5 | 277 | goto err; |
0dfd6cf9 | 278 | |
986dbbbe | 279 | ret->public_key = public_key; |
8c6afbc5 RP |
280 | return ret; |
281 | err: | |
282 | CTLOG_free(ret); | |
283 | return NULL; | |
284 | } | |
285 | ||
d4b2bfba MC |
286 | CTLOG *CTLOG_new(EVP_PKEY *public_key, const char *name) |
287 | { | |
d8652be0 | 288 | return CTLOG_new_ex(public_key, name, NULL, NULL); |
d4b2bfba MC |
289 | } |
290 | ||
8c6afbc5 RP |
291 | /* Frees CT log and associated structures */ |
292 | void CTLOG_free(CTLOG *log) | |
293 | { | |
294 | if (log != NULL) { | |
295 | OPENSSL_free(log->name); | |
8c6afbc5 | 296 | EVP_PKEY_free(log->public_key); |
d4b2bfba | 297 | OPENSSL_free(log->propq); |
8c6afbc5 RP |
298 | OPENSSL_free(log); |
299 | } | |
300 | } | |
301 | ||
8c92c4ea | 302 | const char *CTLOG_get0_name(const CTLOG *log) |
8c6afbc5 RP |
303 | { |
304 | return log->name; | |
305 | } | |
306 | ||
8c92c4ea RP |
307 | void CTLOG_get0_log_id(const CTLOG *log, const uint8_t **log_id, |
308 | size_t *log_id_len) | |
8c6afbc5 RP |
309 | { |
310 | *log_id = log->log_id; | |
311 | *log_id_len = CT_V1_HASHLEN; | |
312 | } | |
313 | ||
8c92c4ea | 314 | EVP_PKEY *CTLOG_get0_public_key(const CTLOG *log) |
8c6afbc5 RP |
315 | { |
316 | return log->public_key; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Given a log ID, finds the matching log. | |
321 | * Returns NULL if no match found. | |
322 | */ | |
12d2d281 RP |
323 | const CTLOG *CTLOG_STORE_get0_log_by_id(const CTLOG_STORE *store, |
324 | const uint8_t *log_id, | |
325 | size_t log_id_len) | |
8c6afbc5 RP |
326 | { |
327 | int i; | |
0dfd6cf9 | 328 | |
8c6afbc5 | 329 | for (i = 0; i < sk_CTLOG_num(store->logs); ++i) { |
12d2d281 | 330 | const CTLOG *log = sk_CTLOG_value(store->logs, i); |
8c6afbc5 RP |
331 | if (memcmp(log->log_id, log_id, log_id_len) == 0) |
332 | return log; | |
333 | } | |
0dfd6cf9 | 334 | |
8c6afbc5 RP |
335 | return NULL; |
336 | } |