1 /*
2 * Copyright 2000-2023 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
DSO_new_method(DSO_METHOD * meth)13 static DSO *DSO_new_method(DSO_METHOD *meth)
14 {
15 DSO *ret;
16
17 ret = OPENSSL_zalloc(sizeof(*ret));
18 if (ret == NULL)
19 return NULL;
20 ret->meth_data = sk_void_new_null();
21 if (ret->meth_data == NULL) {
22 /* sk_new doesn't generate any errors so we do */
23 ERR_raise(ERR_LIB_DSO, ERR_R_CRYPTO_LIB);
24 OPENSSL_free(ret);
25 return NULL;
26 }
27 ret->meth = DSO_METHOD_openssl();
28 if (!CRYPTO_NEW_REF(&ret->references, 1)) {
29 sk_void_free(ret->meth_data);
30 OPENSSL_free(ret);
31 return NULL;
32 }
33
34 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
35 DSO_free(ret);
36 ret = NULL;
37 }
38
39 return ret;
40 }
41
DSO_new(void)42 DSO *DSO_new(void)
43 {
44 return DSO_new_method(NULL);
45 }
46
DSO_free(DSO * dso)47 int DSO_free(DSO *dso)
48 {
49 int i;
50
51 if (dso == NULL)
52 return 1;
53
54 if (CRYPTO_DOWN_REF(&dso->references, &i) <= 0)
55 return 0;
56
57 REF_PRINT_COUNT("DSO", dso);
58 if (i > 0)
59 return 1;
60 REF_ASSERT_ISNT(i < 0);
61
62 if ((dso->flags & DSO_FLAG_NO_UNLOAD_ON_FREE) == 0) {
63 if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
64 ERR_raise(ERR_LIB_DSO, DSO_R_UNLOAD_FAILED);
65 return 0;
66 }
67 }
68
69 if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
70 ERR_raise(ERR_LIB_DSO, DSO_R_FINISH_FAILED);
71 return 0;
72 }
73
74 sk_void_free(dso->meth_data);
75 OPENSSL_free(dso->filename);
76 OPENSSL_free(dso->loaded_filename);
77 CRYPTO_FREE_REF(&dso->references);
78 OPENSSL_free(dso);
79 return 1;
80 }
81
DSO_flags(DSO * dso)82 int DSO_flags(DSO *dso)
83 {
84 return ((dso == NULL) ? 0 : dso->flags);
85 }
86
DSO_up_ref(DSO * dso)87 int DSO_up_ref(DSO *dso)
88 {
89 int i;
90
91 if (dso == NULL) {
92 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
93 return 0;
94 }
95
96 if (CRYPTO_UP_REF(&dso->references, &i) <= 0)
97 return 0;
98
99 REF_PRINT_COUNT("DSO", dso);
100 REF_ASSERT_ISNT(i < 2);
101 return ((i > 1) ? 1 : 0);
102 }
103
DSO_load(DSO * dso,const char * filename,DSO_METHOD * meth,int flags)104 DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
105 {
106 DSO *ret;
107 int allocated = 0;
108
109 if (dso == NULL) {
110 ret = DSO_new_method(meth);
111 if (ret == NULL) {
112 ERR_raise(ERR_LIB_DSO, ERR_R_DSO_LIB);
113 goto err;
114 }
115 allocated = 1;
116 /* Pass the provided flags to the new DSO object */
117 if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
118 ERR_raise(ERR_LIB_DSO, DSO_R_CTRL_FAILED);
119 goto err;
120 }
121 } else
122 ret = dso;
123 /* Don't load if we're currently already loaded */
124 if (ret->filename != NULL) {
125 ERR_raise(ERR_LIB_DSO, DSO_R_DSO_ALREADY_LOADED);
126 goto err;
127 }
128 /*
129 * filename can only be NULL if we were passed a dso that already has one
130 * set.
131 */
132 if (filename != NULL)
133 if (!DSO_set_filename(ret, filename)) {
134 ERR_raise(ERR_LIB_DSO, DSO_R_SET_FILENAME_FAILED);
135 goto err;
136 }
137 filename = ret->filename;
138 if (filename == NULL) {
139 ERR_raise(ERR_LIB_DSO, DSO_R_NO_FILENAME);
140 goto err;
141 }
142 if (ret->meth->dso_load == NULL) {
143 ERR_raise(ERR_LIB_DSO, DSO_R_UNSUPPORTED);
144 goto err;
145 }
146 if (!ret->meth->dso_load(ret)) {
147 ERR_raise(ERR_LIB_DSO, DSO_R_LOAD_FAILED);
148 goto err;
149 }
150 /* Load succeeded */
151 return ret;
152 err:
153 if (allocated)
154 DSO_free(ret);
155 return NULL;
156 }
157
DSO_bind_func(DSO * dso,const char * symname)158 DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
159 {
160 DSO_FUNC_TYPE ret = NULL;
161
162 if ((dso == NULL) || (symname == NULL)) {
163 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
164 return NULL;
165 }
166 if (dso->meth->dso_bind_func == NULL) {
167 ERR_raise(ERR_LIB_DSO, DSO_R_UNSUPPORTED);
168 return NULL;
169 }
170 if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
171 ERR_raise(ERR_LIB_DSO, DSO_R_SYM_FAILURE);
172 return NULL;
173 }
174 /* Success */
175 return ret;
176 }
177
178 /*
179 * I don't really like these *_ctrl functions very much to be perfectly
180 * honest. For one thing, I think I have to return a negative value for any
181 * error because possible DSO_ctrl() commands may return values such as
182 * "size"s that can legitimately be zero (making the standard
183 * "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
184 * times. I'd prefer "output" values to be passed by reference and the return
185 * value as success/failure like usual ... but we conform when we must... :-)
186 */
DSO_ctrl(DSO * dso,int cmd,long larg,void * parg)187 long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
188 {
189 if (dso == NULL) {
190 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
191 return -1;
192 }
193 /*
194 * We should intercept certain generic commands and only pass control to
195 * the method-specific ctrl() function if it's something we don't handle.
196 */
197 switch (cmd) {
198 case DSO_CTRL_GET_FLAGS:
199 return dso->flags;
200 case DSO_CTRL_SET_FLAGS:
201 dso->flags = (int)larg;
202 return 0;
203 case DSO_CTRL_OR_FLAGS:
204 dso->flags |= (int)larg;
205 return 0;
206 default:
207 break;
208 }
209 if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
210 ERR_raise(ERR_LIB_DSO, DSO_R_UNSUPPORTED);
211 return -1;
212 }
213 return dso->meth->dso_ctrl(dso, cmd, larg, parg);
214 }
215
DSO_get_filename(DSO * dso)216 const char *DSO_get_filename(DSO *dso)
217 {
218 if (dso == NULL) {
219 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
220 return NULL;
221 }
222 return dso->filename;
223 }
224
DSO_set_filename(DSO * dso,const char * filename)225 int DSO_set_filename(DSO *dso, const char *filename)
226 {
227 char *copied;
228
229 if ((dso == NULL) || (filename == NULL)) {
230 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
231 return 0;
232 }
233 if (dso->loaded_filename) {
234 ERR_raise(ERR_LIB_DSO, DSO_R_DSO_ALREADY_LOADED);
235 return 0;
236 }
237 /* We'll duplicate filename */
238 copied = OPENSSL_strdup(filename);
239 if (copied == NULL)
240 return 0;
241 OPENSSL_free(dso->filename);
242 dso->filename = copied;
243 return 1;
244 }
245
DSO_merge(DSO * dso,const char * filespec1,const char * filespec2)246 char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
247 {
248 char *result = NULL;
249
250 if (dso == NULL || filespec1 == NULL) {
251 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
252 return NULL;
253 }
254 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
255 if (dso->merger != NULL)
256 result = dso->merger(dso, filespec1, filespec2);
257 else if (dso->meth->dso_merger != NULL)
258 result = dso->meth->dso_merger(dso, filespec1, filespec2);
259 }
260 return result;
261 }
262
DSO_convert_filename(DSO * dso,const char * filename)263 char *DSO_convert_filename(DSO *dso, const char *filename)
264 {
265 char *result = NULL;
266
267 if (dso == NULL) {
268 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
269 return NULL;
270 }
271 if (filename == NULL)
272 filename = dso->filename;
273 if (filename == NULL) {
274 ERR_raise(ERR_LIB_DSO, DSO_R_NO_FILENAME);
275 return NULL;
276 }
277 if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
278 if (dso->name_converter != NULL)
279 result = dso->name_converter(dso, filename);
280 else if (dso->meth->dso_name_converter != NULL)
281 result = dso->meth->dso_name_converter(dso, filename);
282 }
283 if (result == NULL) {
284 result = OPENSSL_strdup(filename);
285 if (result == NULL)
286 return NULL;
287 }
288 return result;
289 }
290
DSO_pathbyaddr(void * addr,char * path,int sz)291 int DSO_pathbyaddr(void *addr, char *path, int sz)
292 {
293 DSO_METHOD *meth = DSO_METHOD_openssl();
294
295 if (meth->pathbyaddr == NULL) {
296 ERR_raise(ERR_LIB_DSO, DSO_R_UNSUPPORTED);
297 return -1;
298 }
299 return (*meth->pathbyaddr) (addr, path, sz);
300 }
301
DSO_dsobyaddr(void * addr,int flags)302 DSO *DSO_dsobyaddr(void *addr, int flags)
303 {
304 DSO *ret = NULL;
305 char *filename = NULL;
306 int len = DSO_pathbyaddr(addr, NULL, 0);
307
308 if (len < 0)
309 return NULL;
310
311 filename = OPENSSL_malloc(len);
312 if (filename != NULL
313 && DSO_pathbyaddr(addr, filename, len) == len)
314 ret = DSO_load(NULL, filename, NULL, flags);
315
316 OPENSSL_free(filename);
317 return ret;
318 }
319
DSO_global_lookup(const char * name)320 void *DSO_global_lookup(const char *name)
321 {
322 DSO_METHOD *meth = DSO_METHOD_openssl();
323
324 if (meth->globallookup == NULL) {
325 ERR_raise(ERR_LIB_DSO, DSO_R_UNSUPPORTED);
326 return NULL;
327 }
328 return (*meth->globallookup) (name);
329 }
330
