1/*
2 * Copyright 2000-2017 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 "dso_local.h"
11#include "internal/refcount.h"
12
13static DSO_METHOD *default_DSO_meth = NULL;
14
15static DSO *DSO_new_method(DSO_METHOD *meth)
16{
17 DSO *ret;
18
19 if (default_DSO_meth == NULL) {
20 /*
21 * We default to DSO_METH_openssl() which in turn defaults to
22 * stealing the "best available" method. Will fallback to
23 * DSO_METH_null() in the worst case.
24 */
25 default_DSO_meth = DSO_METHOD_openssl();
26 }
27 ret = OPENSSL_zalloc(sizeof(*ret));
28 if (ret == NULL) {
29 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
30 return NULL;
31 }
32 ret->meth_data = sk_void_new_null();
33 if (ret->meth_data == NULL) {
34 /* sk_new doesn't generate any errors so we do */
35 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
36 OPENSSL_free(ret);
37 return NULL;
38 }
39 ret->meth = default_DSO_meth;
40 ret->references = 1;
41 ret->lock = CRYPTO_THREAD_lock_new();
42 if (ret->lock == NULL) {
43 DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
44 sk_void_free(ret->meth_data);
45 OPENSSL_free(ret);
46 return NULL;
47 }
48
49 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
50 DSO_free(ret);
51 ret = NULL;
52 }
53
54 return ret;
55}
56
57DSO *DSO_new(void)
58{
59 return DSO_new_method(NULL);
60}
61
62int DSO_free(DSO *dso)
63{
64 int i;
65
66 if (dso == NULL)
67 return 1;
68
69 if (CRYPTO_DOWN_REF(&dso->references, &i, dso->lock) <= 0)
70 return 0;
71
72 REF_PRINT_COUNT("DSO", dso);
73 if (i > 0)
74 return 1;
75 REF_ASSERT_ISNT(i < 0);
76
77 if ((dso->flags & DSO_FLAG_NO_UNLOAD_ON_FREE) == 0) {
78 if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
79 DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
80 return 0;
81 }
82 }
83
84 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
85 DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED);
86 return 0;
87 }
88
89 sk_void_free(dso->meth_data);
90 OPENSSL_free(dso->filename);
91 OPENSSL_free(dso->loaded_filename);
92 CRYPTO_THREAD_lock_free(dso->lock);
93 OPENSSL_free(dso);
94 return 1;
95}
96
97int DSO_flags(DSO *dso)
98{
99 return ((dso == NULL) ? 0 : dso->flags);
100}
101
102int DSO_up_ref(DSO *dso)
103{
104 int i;
105
106 if (dso == NULL) {
107 DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
108 return 0;
109 }
110
111 if (CRYPTO_UP_REF(&dso->references, &i, dso->lock) <= 0)
112 return 0;
113
114 REF_PRINT_COUNT("DSO", dso);
115 REF_ASSERT_ISNT(i < 2);
116 return ((i > 1) ? 1 : 0);
117}
118
119DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
120{
121 DSO *ret;
122 int allocated = 0;
123
124 if (dso == NULL) {
125 ret = DSO_new_method(meth);
126 if (ret == NULL) {
127 DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE);
128 goto err;
129 }
130 allocated = 1;
131 /* Pass the provided flags to the new DSO object */
132 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
133 DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED);
134 goto err;
135 }
136 } else
137 ret = dso;
138 /* Don't load if we're currently already loaded */
139 if (ret->filename != NULL) {
140 DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED);
141 goto err;
142 }
143 /*
144 * filename can only be NULL if we were passed a dso that already has one
145 * set.
146 */
147 if (filename != NULL)
148 if (!DSO_set_filename(ret, filename)) {
149 DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED);
150 goto err;
151 }
152 filename = ret->filename;
153 if (filename == NULL) {
154 DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME);
155 goto err;
156 }
157 if (ret->meth->dso_load == NULL) {
158 DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED);
159 goto err;
160 }
161 if (!ret->meth->dso_load(ret)) {
162 DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED);
163 goto err;
164 }
165 /* Load succeeded */
166 return ret;
167 err:
168 if (allocated)
169 DSO_free(ret);
170 return NULL;
171}
172
173DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
174{
175 DSO_FUNC_TYPE ret = NULL;
176
177 if ((dso == NULL) || (symname == NULL)) {
178 DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
179 return NULL;
180 }
181 if (dso->meth->dso_bind_func == NULL) {
182 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED);
183 return NULL;
184 }
185 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
186 DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE);
187 return NULL;
188 }
189 /* Success */
190 return ret;
191}
192
193/*
194 * I don't really like these *_ctrl functions very much to be perfectly
195 * honest. For one thing, I think I have to return a negative value for any
196 * error because possible DSO_ctrl() commands may return values such as
197 * "size"s that can legitimately be zero (making the standard
198 * "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
199 * times. I'd prefer "output" values to be passed by reference and the return
200 * value as success/failure like usual ... but we conform when we must... :-)
201 */
202long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
203{
204 if (dso == NULL) {
205 DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER);
206 return -1;
207 }
208 /*
209 * We should intercept certain generic commands and only pass control to
210 * the method-specific ctrl() function if it's something we don't handle.
211 */
212 switch (cmd) {
213 case DSO_CTRL_GET_FLAGS:
214 return dso->flags;
215 case DSO_CTRL_SET_FLAGS:
216 dso->flags = (int)larg;
217 return 0;
218 case DSO_CTRL_OR_FLAGS:
219 dso->flags |= (int)larg;
220 return 0;
221 default:
222 break;
223 }
224 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
225 DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED);
226 return -1;
227 }
228 return dso->meth->dso_ctrl(dso, cmd, larg, parg);
229}
230
231const char *DSO_get_filename(DSO *dso)
232{
233 if (dso == NULL) {
234 DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
235 return NULL;
236 }
237 return dso->filename;
238}
239
240int DSO_set_filename(DSO *dso, const char *filename)
241{
242 char *copied;
243
244 if ((dso == NULL) || (filename == NULL)) {
245 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
246 return 0;
247 }
248 if (dso->loaded_filename) {
249 DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED);
250 return 0;
251 }
252 /* We'll duplicate filename */
253 copied = OPENSSL_strdup(filename);
254 if (copied == NULL) {
255 DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE);
256 return 0;
257 }
258 OPENSSL_free(dso->filename);
259 dso->filename = copied;
260 return 1;
261}
262
263char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
264{
265 char *result = NULL;
266
267 if (dso == NULL || filespec1 == NULL) {
268 DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER);
269 return NULL;
270 }
271 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
272 if (dso->merger != NULL)
273 result = dso->merger(dso, filespec1, filespec2);
274 else if (dso->meth->dso_merger != NULL)
275 result = dso->meth->dso_merger(dso, filespec1, filespec2);
276 }
277 return result;
278}
279
280char *DSO_convert_filename(DSO *dso, const char *filename)
281{
282 char *result = NULL;
283
284 if (dso == NULL) {
285 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
286 return NULL;
287 }
288 if (filename == NULL)
289 filename = dso->filename;
290 if (filename == NULL) {
291 DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME);
292 return NULL;
293 }
294 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
295 if (dso->name_converter != NULL)
296 result = dso->name_converter(dso, filename);
297 else if (dso->meth->dso_name_converter != NULL)
298 result = dso->meth->dso_name_converter(dso, filename);
299 }
300 if (result == NULL) {
301 result = OPENSSL_strdup(filename);
302 if (result == NULL) {
303 DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE);
304 return NULL;
305 }
306 }
307 return result;
308}
309
310int DSO_pathbyaddr(void *addr, char *path, int sz)
311{
312 DSO_METHOD *meth = default_DSO_meth;
313 if (meth == NULL)
314 meth = DSO_METHOD_openssl();
315 if (meth->pathbyaddr == NULL) {
316 DSOerr(DSO_F_DSO_PATHBYADDR, DSO_R_UNSUPPORTED);
317 return -1;
318 }
319 return (*meth->pathbyaddr) (addr, path, sz);
320}
321
322DSO *DSO_dsobyaddr(void *addr, int flags)
323{
324 DSO *ret = NULL;
325 char *filename = NULL;
326 int len = DSO_pathbyaddr(addr, NULL, 0);
327
328 if (len < 0)
329 return NULL;
330
331 filename = OPENSSL_malloc(len);
332 if (filename != NULL
333 && DSO_pathbyaddr(addr, filename, len) == len)
334 ret = DSO_load(NULL, filename, NULL, flags);
335
336 OPENSSL_free(filename);
337 return ret;
338}
339
340void *DSO_global_lookup(const char *name)
341{
342 DSO_METHOD *meth = default_DSO_meth;
343 if (meth == NULL)
344 meth = DSO_METHOD_openssl();
345 if (meth->globallookup == NULL) {
346 DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED);
347 return NULL;
348 }
349 return (*meth->globallookup) (name);
350}
351