This has been added to avoid the situation where some host ctype.h functions
[openssl.git] / crypto / store / store_register.c
1 /*
2  * Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the OpenSSL license (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 "internal/ctype.h"
12 #include <assert.h>
13
14 #include <openssl/err.h>
15 #include <openssl/lhash.h>
16 #include "store_locl.h"
17
18 static CRYPTO_RWLOCK *registry_lock;
19 static CRYPTO_ONCE registry_init = CRYPTO_ONCE_STATIC_INIT;
20
21 DEFINE_RUN_ONCE_STATIC(do_registry_init)
22 {
23     registry_lock = CRYPTO_THREAD_lock_new();
24     return registry_lock != NULL;
25 }
26
27 /*
28  *  Functions for manipulating OSSL_STORE_LOADERs
29  */
30
31 OSSL_STORE_LOADER *OSSL_STORE_LOADER_new(ENGINE *e, const char *scheme)
32 {
33     OSSL_STORE_LOADER *res = NULL;
34
35     /*
36      * We usually don't check NULL arguments.  For loaders, though, the
37      * scheme is crucial and must never be NULL, or the user will get
38      * mysterious errors when trying to register the created loader
39      * later on.
40      */
41     if (scheme == NULL) {
42         OSSL_STOREerr(OSSL_STORE_F_OSSL_STORE_LOADER_NEW,
43                       OSSL_STORE_R_INVALID_SCHEME);
44         return NULL;
45     }
46
47     if ((res = OPENSSL_zalloc(sizeof(*res))) == NULL) {
48         OSSL_STOREerr(OSSL_STORE_F_OSSL_STORE_LOADER_NEW, ERR_R_MALLOC_FAILURE);
49         return NULL;
50     }
51
52     res->engine = e;
53     res->scheme = scheme;
54     return res;
55 }
56
57 const ENGINE *OSSL_STORE_LOADER_get0_engine(const OSSL_STORE_LOADER *loader)
58 {
59     return loader->engine;
60 }
61
62 const char *OSSL_STORE_LOADER_get0_scheme(const OSSL_STORE_LOADER *loader)
63 {
64     return loader->scheme;
65 }
66
67 int OSSL_STORE_LOADER_set_open(OSSL_STORE_LOADER *loader,
68                                OSSL_STORE_open_fn open_function)
69 {
70     loader->open = open_function;
71     return 1;
72 }
73
74 int OSSL_STORE_LOADER_set_ctrl(OSSL_STORE_LOADER *loader,
75                                OSSL_STORE_ctrl_fn ctrl_function)
76 {
77     loader->ctrl = ctrl_function;
78     return 1;
79 }
80
81 int OSSL_STORE_LOADER_set_load(OSSL_STORE_LOADER *loader,
82                                OSSL_STORE_load_fn load_function)
83 {
84     loader->load = load_function;
85     return 1;
86 }
87
88 int OSSL_STORE_LOADER_set_eof(OSSL_STORE_LOADER *loader,
89                               OSSL_STORE_eof_fn eof_function)
90 {
91     loader->eof = eof_function;
92     return 1;
93 }
94
95 int OSSL_STORE_LOADER_set_error(OSSL_STORE_LOADER *loader,
96                                 OSSL_STORE_error_fn error_function)
97 {
98     loader->error = error_function;
99     return 1;
100 }
101
102 int OSSL_STORE_LOADER_set_close(OSSL_STORE_LOADER *loader,
103                                 OSSL_STORE_close_fn close_function)
104 {
105     loader->close = close_function;
106     return 1;
107 }
108
109 void OSSL_STORE_LOADER_free(OSSL_STORE_LOADER *loader)
110 {
111     OPENSSL_free(loader);
112 }
113
114 /*
115  *  Functions for registering OSSL_STORE_LOADERs
116  */
117
118 static unsigned long store_loader_hash(const OSSL_STORE_LOADER *v)
119 {
120     return OPENSSL_LH_strhash(v->scheme);
121 }
122
123 static int store_loader_cmp(const OSSL_STORE_LOADER *a,
124                             const OSSL_STORE_LOADER *b)
125 {
126     assert(a->scheme != NULL && b->scheme != NULL);
127     return strcmp(a->scheme, b->scheme);
128 }
129
130 static LHASH_OF(OSSL_STORE_LOADER) *loader_register = NULL;
131
132 int ossl_store_register_loader_int(OSSL_STORE_LOADER *loader)
133 {
134     const char *scheme = loader->scheme;
135     int ok = 0;
136
137     /*
138      * Check that the given scheme conforms to correct scheme syntax as per
139      * RFC 3986:
140      *
141      * scheme        = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
142      */
143     if (ossl_isalpha(*scheme))
144         while (*scheme != '\0'
145                && (ossl_isalpha(*scheme)
146                    || ossl_isdigit(*scheme)
147                    || strchr("+-.", *scheme) != NULL))
148             scheme++;
149     if (*scheme != '\0') {
150         OSSL_STOREerr(OSSL_STORE_F_OSSL_STORE_REGISTER_LOADER_INT,
151                       OSSL_STORE_R_INVALID_SCHEME);
152         ERR_add_error_data(2, "scheme=", loader->scheme);
153         return 0;
154     }
155
156     /* Check that functions we absolutely require are present */
157     if (loader->open == NULL || loader->load == NULL || loader->eof == NULL
158         || loader->error == NULL || loader->close == NULL) {
159         OSSL_STOREerr(OSSL_STORE_F_OSSL_STORE_REGISTER_LOADER_INT,
160                       OSSL_STORE_R_LOADER_INCOMPLETE);
161         return 0;
162     }
163
164     if (!RUN_ONCE(&registry_init, do_registry_init)) {
165         OSSL_STOREerr(OSSL_STORE_F_OSSL_STORE_REGISTER_LOADER_INT,
166                       ERR_R_MALLOC_FAILURE);
167         return 0;
168     }
169     CRYPTO_THREAD_write_lock(registry_lock);
170
171     if (loader_register == NULL) {
172         loader_register = lh_OSSL_STORE_LOADER_new(store_loader_hash,
173                                                    store_loader_cmp);
174     }
175
176     if (loader_register != NULL
177         && (lh_OSSL_STORE_LOADER_insert(loader_register, loader) != NULL
178             || lh_OSSL_STORE_LOADER_error(loader_register) == 0))
179         ok = 1;
180
181     CRYPTO_THREAD_unlock(registry_lock);
182
183     return ok;
184 }
185 int OSSL_STORE_register_loader(OSSL_STORE_LOADER *loader)
186 {
187     if (!ossl_store_init_once())
188         return 0;
189     return ossl_store_register_loader_int(loader);
190 }
191
192 const OSSL_STORE_LOADER *ossl_store_get0_loader_int(const char *scheme)
193 {
194     OSSL_STORE_LOADER template;
195     OSSL_STORE_LOADER *loader = NULL;
196
197     template.scheme = scheme;
198     template.open = NULL;
199     template.load = NULL;
200     template.eof = NULL;
201     template.close = NULL;
202
203     if (!ossl_store_init_once())
204         return NULL;
205
206     if (!RUN_ONCE(&registry_init, do_registry_init)) {
207         OSSL_STOREerr(OSSL_STORE_F_OSSL_STORE_GET0_LOADER_INT,
208                       ERR_R_MALLOC_FAILURE);
209         return NULL;
210     }
211     CRYPTO_THREAD_write_lock(registry_lock);
212
213     loader = lh_OSSL_STORE_LOADER_retrieve(loader_register, &template);
214
215     if (loader == NULL) {
216         OSSL_STOREerr(OSSL_STORE_F_OSSL_STORE_GET0_LOADER_INT,
217                       OSSL_STORE_R_UNREGISTERED_SCHEME);
218         ERR_add_error_data(2, "scheme=", scheme);
219     }
220
221     CRYPTO_THREAD_unlock(registry_lock);
222
223     return loader;
224 }
225
226 OSSL_STORE_LOADER *ossl_store_unregister_loader_int(const char *scheme)
227 {
228     OSSL_STORE_LOADER template;
229     OSSL_STORE_LOADER *loader = NULL;
230
231     template.scheme = scheme;
232     template.open = NULL;
233     template.load = NULL;
234     template.eof = NULL;
235     template.close = NULL;
236
237     if (!RUN_ONCE(&registry_init, do_registry_init)) {
238         OSSL_STOREerr(OSSL_STORE_F_OSSL_STORE_UNREGISTER_LOADER_INT,
239                       ERR_R_MALLOC_FAILURE);
240         return NULL;
241     }
242     CRYPTO_THREAD_write_lock(registry_lock);
243
244     loader = lh_OSSL_STORE_LOADER_delete(loader_register, &template);
245
246     if (loader == NULL) {
247         OSSL_STOREerr(OSSL_STORE_F_OSSL_STORE_UNREGISTER_LOADER_INT,
248                       OSSL_STORE_R_UNREGISTERED_SCHEME);
249         ERR_add_error_data(2, "scheme=", scheme);
250     }
251
252     CRYPTO_THREAD_unlock(registry_lock);
253
254     return loader;
255 }
256 OSSL_STORE_LOADER *OSSL_STORE_unregister_loader(const char *scheme)
257 {
258     if (!ossl_store_init_once())
259         return 0;
260     return ossl_store_unregister_loader_int(scheme);
261 }
262
263 void ossl_store_destroy_loaders_int(void)
264 {
265     assert(lh_OSSL_STORE_LOADER_num_items(loader_register) == 0);
266     lh_OSSL_STORE_LOADER_free(loader_register);
267     loader_register = NULL;
268     CRYPTO_THREAD_lock_free(registry_lock);
269     registry_lock = NULL;
270 }
271
272 /*
273  *  Functions to list OSSL_STORE loaders
274  */
275
276 IMPLEMENT_LHASH_DOALL_ARG_CONST(OSSL_STORE_LOADER, void);
277 int OSSL_STORE_do_all_loaders(void (*do_function) (const OSSL_STORE_LOADER
278                                                    *loader, void *do_arg),
279                               void *do_arg)
280 {
281     lh_OSSL_STORE_LOADER_doall_void(loader_register, do_function, do_arg);
282     return 1;
283 }