1 /*
2 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
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
8 */
9
10 #include <string.h>
11 #include <openssl/trace.h>
12 #include <openssl/err.h>
13 #include <openssl/conf.h>
14 #include <openssl/safestack.h>
15 #include <openssl/provider.h>
16 #include "internal/provider.h"
17 #include "internal/cryptlib.h"
18 #include "provider_local.h"
19
20 DEFINE_STACK_OF(OSSL_PROVIDER)
21
22 /* PROVIDER config module */
23
24 typedef struct {
25 CRYPTO_RWLOCK *lock;
26 STACK_OF(OSSL_PROVIDER) *activated_providers;
27 } PROVIDER_CONF_GLOBAL;
28
prov_conf_ossl_ctx_new(OSSL_LIB_CTX * libctx)29 static void *prov_conf_ossl_ctx_new(OSSL_LIB_CTX *libctx)
30 {
31 PROVIDER_CONF_GLOBAL *pcgbl = OPENSSL_zalloc(sizeof(*pcgbl));
32
33 if (pcgbl == NULL)
34 return NULL;
35
36 pcgbl->lock = CRYPTO_THREAD_lock_new();
37 if (pcgbl->lock == NULL) {
38 OPENSSL_free(pcgbl);
39 return NULL;
40 }
41
42 return pcgbl;
43 }
44
prov_conf_ossl_ctx_free(void * vpcgbl)45 static void prov_conf_ossl_ctx_free(void *vpcgbl)
46 {
47 PROVIDER_CONF_GLOBAL *pcgbl = vpcgbl;
48
49 sk_OSSL_PROVIDER_pop_free(pcgbl->activated_providers,
50 ossl_provider_free);
51
52 OSSL_TRACE(CONF, "Cleaned up providers\n");
53 CRYPTO_THREAD_lock_free(pcgbl->lock);
54 OPENSSL_free(pcgbl);
55 }
56
57 static const OSSL_LIB_CTX_METHOD provider_conf_ossl_ctx_method = {
58 /* Must be freed before the provider store is freed */
59 OSSL_LIB_CTX_METHOD_PRIORITY_2,
60 prov_conf_ossl_ctx_new,
61 prov_conf_ossl_ctx_free,
62 };
63
skip_dot(const char * name)64 static const char *skip_dot(const char *name)
65 {
66 const char *p = strchr(name, '.');
67
68 if (p != NULL)
69 return p + 1;
70 return name;
71 }
72
provider_conf_params(OSSL_PROVIDER * prov,OSSL_PROVIDER_INFO * provinfo,const char * name,const char * value,const CONF * cnf)73 static int provider_conf_params(OSSL_PROVIDER *prov,
74 OSSL_PROVIDER_INFO *provinfo,
75 const char *name, const char *value,
76 const CONF *cnf)
77 {
78 STACK_OF(CONF_VALUE) *sect;
79 int ok = 1;
80
81 sect = NCONF_get_section(cnf, value);
82 if (sect != NULL) {
83 int i;
84 char buffer[512];
85 size_t buffer_len = 0;
86
87 OSSL_TRACE1(CONF, "Provider params: start section %s\n", value);
88
89 if (name != NULL) {
90 OPENSSL_strlcpy(buffer, name, sizeof(buffer));
91 OPENSSL_strlcat(buffer, ".", sizeof(buffer));
92 buffer_len = strlen(buffer);
93 }
94
95 for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
96 CONF_VALUE *sectconf = sk_CONF_VALUE_value(sect, i);
97
98 if (buffer_len + strlen(sectconf->name) >= sizeof(buffer))
99 return 0;
100 buffer[buffer_len] = '\0';
101 OPENSSL_strlcat(buffer, sectconf->name, sizeof(buffer));
102 if (!provider_conf_params(prov, provinfo, buffer, sectconf->value,
103 cnf))
104 return 0;
105 }
106
107 OSSL_TRACE1(CONF, "Provider params: finish section %s\n", value);
108 } else {
109 OSSL_TRACE2(CONF, "Provider params: %s = %s\n", name, value);
110 if (prov != NULL)
111 ok = ossl_provider_add_parameter(prov, name, value);
112 else
113 ok = ossl_provider_info_add_parameter(provinfo, name, value);
114 }
115
116 return ok;
117 }
118
prov_already_activated(const char * name,STACK_OF (OSSL_PROVIDER)* activated)119 static int prov_already_activated(const char *name,
120 STACK_OF(OSSL_PROVIDER) *activated)
121 {
122 int i, max;
123
124 if (activated == NULL)
125 return 0;
126
127 max = sk_OSSL_PROVIDER_num(activated);
128 for (i = 0; i < max; i++) {
129 OSSL_PROVIDER *tstprov = sk_OSSL_PROVIDER_value(activated, i);
130
131 if (strcmp(OSSL_PROVIDER_get0_name(tstprov), name) == 0) {
132 return 1;
133 }
134 }
135
136 return 0;
137 }
138
provider_conf_load(OSSL_LIB_CTX * libctx,const char * name,const char * value,const CONF * cnf)139 static int provider_conf_load(OSSL_LIB_CTX *libctx, const char *name,
140 const char *value, const CONF *cnf)
141 {
142 int i;
143 STACK_OF(CONF_VALUE) *ecmds;
144 int soft = 0;
145 OSSL_PROVIDER *prov = NULL, *actual = NULL;
146 const char *path = NULL;
147 long activate = 0;
148 int ok = 0;
149 PROVIDER_CONF_GLOBAL *pcgbl
150 = ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_PROVIDER_CONF_INDEX,
151 &provider_conf_ossl_ctx_method);
152
153 name = skip_dot(name);
154 OSSL_TRACE1(CONF, "Configuring provider %s\n", name);
155 /* Value is a section containing PROVIDER commands */
156 ecmds = NCONF_get_section(cnf, value);
157
158 if (!ecmds) {
159 ERR_raise_data(ERR_LIB_CRYPTO, CRYPTO_R_PROVIDER_SECTION_ERROR,
160 "section=%s not found", value);
161 return 0;
162 }
163
164 /* Find the needed data first */
165 for (i = 0; i < sk_CONF_VALUE_num(ecmds); i++) {
166 CONF_VALUE *ecmd = sk_CONF_VALUE_value(ecmds, i);
167 const char *confname = skip_dot(ecmd->name);
168 const char *confvalue = ecmd->value;
169
170 OSSL_TRACE2(CONF, "Provider command: %s = %s\n",
171 confname, confvalue);
172
173 /* First handle some special pseudo confs */
174
175 /* Override provider name to use */
176 if (strcmp(confname, "identity") == 0)
177 name = confvalue;
178 else if (strcmp(confname, "soft_load") == 0)
179 soft = 1;
180 /* Load a dynamic PROVIDER */
181 else if (strcmp(confname, "module") == 0)
182 path = confvalue;
183 else if (strcmp(confname, "activate") == 0)
184 activate = 1;
185 }
186
187 if (activate) {
188 if (!CRYPTO_THREAD_write_lock(pcgbl->lock)) {
189 ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
190 return 0;
191 }
192 if (!prov_already_activated(name, pcgbl->activated_providers)) {
193 /*
194 * There is an attempt to activate a provider, so we should disable
195 * loading of fallbacks. Otherwise a misconfiguration could mean the
196 * intended provider does not get loaded. Subsequent fetches could
197 * then fallback to the default provider - which may be the wrong
198 * thing.
199 */
200 if (!ossl_provider_disable_fallback_loading(libctx)) {
201 CRYPTO_THREAD_unlock(pcgbl->lock);
202 ERR_raise(ERR_LIB_CRYPTO, ERR_R_INTERNAL_ERROR);
203 return 0;
204 }
205 prov = ossl_provider_find(libctx, name, 1);
206 if (prov == NULL)
207 prov = ossl_provider_new(libctx, name, NULL, 1);
208 if (prov == NULL) {
209 CRYPTO_THREAD_unlock(pcgbl->lock);
210 if (soft)
211 ERR_clear_error();
212 return 0;
213 }
214
215 if (path != NULL)
216 ossl_provider_set_module_path(prov, path);
217
218 ok = provider_conf_params(prov, NULL, NULL, value, cnf);
219
220 if (ok) {
221 if (!ossl_provider_activate(prov, 1, 0)) {
222 ok = 0;
223 } else if (!ossl_provider_add_to_store(prov, &actual, 0)) {
224 ossl_provider_deactivate(prov);
225 ok = 0;
226 } else {
227 if (pcgbl->activated_providers == NULL)
228 pcgbl->activated_providers = sk_OSSL_PROVIDER_new_null();
229 sk_OSSL_PROVIDER_push(pcgbl->activated_providers, actual);
230 ok = 1;
231 }
232 }
233 if (!ok)
234 ossl_provider_free(prov);
235 }
236 CRYPTO_THREAD_unlock(pcgbl->lock);
237 } else {
238 OSSL_PROVIDER_INFO entry;
239
240 memset(&entry, 0, sizeof(entry));
241 ok = 1;
242 if (name != NULL) {
243 entry.name = OPENSSL_strdup(name);
244 if (entry.name == NULL) {
245 ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
246 ok = 0;
247 }
248 }
249 if (ok && path != NULL) {
250 entry.path = OPENSSL_strdup(path);
251 if (entry.path == NULL) {
252 ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
253 ok = 0;
254 }
255 }
256 if (ok)
257 ok = provider_conf_params(NULL, &entry, NULL, value, cnf);
258 if (ok && (entry.path != NULL || entry.parameters != NULL))
259 ok = ossl_provider_info_add_to_store(libctx, &entry);
260 if (!ok || (entry.path == NULL && entry.parameters == NULL)) {
261 ossl_provider_info_clear(&entry);
262 }
263
264 }
265
266 /*
267 * Even if ok is 0, we still return success. Failure to load a provider is
268 * not fatal. We want to continue to load the rest of the config file.
269 */
270 return 1;
271 }
272
provider_conf_init(CONF_IMODULE * md,const CONF * cnf)273 static int provider_conf_init(CONF_IMODULE *md, const CONF *cnf)
274 {
275 STACK_OF(CONF_VALUE) *elist;
276 CONF_VALUE *cval;
277 int i;
278
279 OSSL_TRACE1(CONF, "Loading providers module: section %s\n",
280 CONF_imodule_get_value(md));
281
282 /* Value is a section containing PROVIDERs to configure */
283 elist = NCONF_get_section(cnf, CONF_imodule_get_value(md));
284
285 if (!elist) {
286 ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_PROVIDER_SECTION_ERROR);
287 return 0;
288 }
289
290 for (i = 0; i < sk_CONF_VALUE_num(elist); i++) {
291 cval = sk_CONF_VALUE_value(elist, i);
292 if (!provider_conf_load(NCONF_get0_libctx((CONF *)cnf),
293 cval->name, cval->value, cnf))
294 return 0;
295 }
296
297 return 1;
298 }
299
ossl_provider_add_conf_module(void)300 void ossl_provider_add_conf_module(void)
301 {
302 OSSL_TRACE(CONF, "Adding config module 'providers'\n");
303 CONF_module_add("providers", provider_conf_init, NULL);
304 }
305