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Commit | Line | Data |
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0f113f3e | 1 | /* |
4af14b7b | 2 | * Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved. |
8f4fac7f | 3 | * |
b6a34e9a | 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 | |
8f4fac7f GT |
8 | */ |
9 | ||
0f113f3e MC |
10 | /* |
11 | * We need to do this early, because stdio.h includes the header files that | |
12 | * handle _GNU_SOURCE and other similar macros. Defining it later is simply | |
13 | * too late, because those headers are protected from re- inclusion. | |
14 | */ | |
c1844095 | 15 | #ifndef _GNU_SOURCE |
0f113f3e | 16 | # define _GNU_SOURCE /* make sure dladdr is declared */ |
3ecbd099 RL |
17 | #endif |
18 | ||
73decf59 | 19 | #include "dso_locl.h" |
3cb4e7dc | 20 | #include "e_os.h" |
8f4fac7f | 21 | |
38186bfd | 22 | #ifdef DSO_DLFCN |
8f4fac7f | 23 | |
0f113f3e MC |
24 | # ifdef HAVE_DLFCN_H |
25 | # ifdef __osf__ | |
26 | # define __EXTENSIONS__ | |
27 | # endif | |
28 | # include <dlfcn.h> | |
29 | # define HAVE_DLINFO 1 | |
38f6f99c | 30 | # if defined(__SCO_VERSION__) || defined(_SCO_ELF) || \ |
afb41913 | 31 | (defined(__osf__) && !defined(RTLD_NEXT)) || \ |
7a4ec19a | 32 | (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \ |
0f113f3e MC |
33 | defined(__ANDROID__) |
34 | # undef HAVE_DLINFO | |
35 | # endif | |
73133962 | 36 | # endif |
8f4fac7f | 37 | |
b9e63915 | 38 | /* Part of the hack in "dlfcn_load" ... */ |
0f113f3e | 39 | # define DSO_MAX_TRANSLATED_SIZE 256 |
b9e63915 | 40 | |
51c8dc37 | 41 | static int dlfcn_load(DSO *dso); |
8f4fac7f | 42 | static int dlfcn_unload(DSO *dso); |
e9a68cfb | 43 | static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname); |
51c8dc37 | 44 | static char *dlfcn_name_converter(DSO *dso, const char *filename); |
cbecb3ac | 45 | static char *dlfcn_merger(DSO *dso, const char *filespec1, |
0f113f3e | 46 | const char *filespec2); |
cb6ea61c | 47 | static int dlfcn_pathbyaddr(void *addr, char *path, int sz); |
c6cb42e4 | 48 | static void *dlfcn_globallookup(const char *name); |
8f4fac7f GT |
49 | |
50 | static DSO_METHOD dso_meth_dlfcn = { | |
0f113f3e MC |
51 | "OpenSSL 'dlfcn' shared library method", |
52 | dlfcn_load, | |
53 | dlfcn_unload, | |
0f113f3e | 54 | dlfcn_bind_func, |
0f113f3e MC |
55 | NULL, /* ctrl */ |
56 | dlfcn_name_converter, | |
57 | dlfcn_merger, | |
58 | NULL, /* init */ | |
59 | NULL, /* finish */ | |
cb6ea61c | 60 | dlfcn_pathbyaddr, |
0f113f3e MC |
61 | dlfcn_globallookup |
62 | }; | |
8f4fac7f | 63 | |
38186bfd | 64 | DSO_METHOD *DSO_METHOD_openssl(void) |
0f113f3e | 65 | { |
38186bfd | 66 | return &dso_meth_dlfcn; |
0f113f3e MC |
67 | } |
68 | ||
69 | /* | |
70 | * Prior to using the dlopen() function, we should decide on the flag we | |
71 | * send. There's a few different ways of doing this and it's a messy | |
72 | * venn-diagram to match up which platforms support what. So as we don't have | |
73 | * autoconf yet, I'm implementing a hack that could be hacked further | |
74 | * relatively easily to deal with cases as we find them. Initially this is to | |
75 | * cope with OpenBSD. | |
76 | */ | |
77 | # if defined(__OpenBSD__) || defined(__NetBSD__) | |
78 | # ifdef DL_LAZY | |
79 | # define DLOPEN_FLAG DL_LAZY | |
80 | # else | |
81 | # ifdef RTLD_NOW | |
82 | # define DLOPEN_FLAG RTLD_NOW | |
83 | # else | |
84 | # define DLOPEN_FLAG 0 | |
85 | # endif | |
86 | # endif | |
87 | # else | |
88 | # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */ | |
89 | # endif | |
1a797ac6 | 90 | |
0f113f3e MC |
91 | /* |
92 | * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle | |
93 | * (void*) returned from dlopen(). | |
8f4fac7f GT |
94 | */ |
95 | ||
51c8dc37 | 96 | static int dlfcn_load(DSO *dso) |
0f113f3e MC |
97 | { |
98 | void *ptr = NULL; | |
99 | /* See applicable comments in dso_dl.c */ | |
100 | char *filename = DSO_convert_filename(dso, NULL); | |
101 | int flags = DLOPEN_FLAG; | |
3cb4e7dc | 102 | int saveerrno = get_last_sys_error(); |
0f113f3e MC |
103 | |
104 | if (filename == NULL) { | |
105 | DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME); | |
106 | goto err; | |
107 | } | |
108 | # ifdef RTLD_GLOBAL | |
109 | if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS) | |
110 | flags |= RTLD_GLOBAL; | |
ea5def14 MK |
111 | # endif |
112 | # ifdef _AIX | |
113 | if (filename[strlen(filename) - 1] == ')') | |
114 | flags |= RTLD_MEMBER; | |
0f113f3e MC |
115 | # endif |
116 | ptr = dlopen(filename, flags); | |
117 | if (ptr == NULL) { | |
118 | DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED); | |
119 | ERR_add_error_data(4, "filename(", filename, "): ", dlerror()); | |
120 | goto err; | |
121 | } | |
3cb4e7dc MC |
122 | /* |
123 | * Some dlopen() implementations (e.g. solaris) do no preserve errno, even | |
124 | * on a successful call. | |
125 | */ | |
126 | set_sys_error(saveerrno); | |
0f113f3e MC |
127 | if (!sk_void_push(dso->meth_data, (char *)ptr)) { |
128 | DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR); | |
129 | goto err; | |
130 | } | |
131 | /* Success */ | |
132 | dso->loaded_filename = filename; | |
208fb891 | 133 | return 1; |
0f113f3e MC |
134 | err: |
135 | /* Cleanup! */ | |
b548a1f1 | 136 | OPENSSL_free(filename); |
0f113f3e MC |
137 | if (ptr != NULL) |
138 | dlclose(ptr); | |
26a7d938 | 139 | return 0; |
51c8dc37 | 140 | } |
8f4fac7f GT |
141 | |
142 | static int dlfcn_unload(DSO *dso) | |
0f113f3e MC |
143 | { |
144 | void *ptr; | |
145 | if (dso == NULL) { | |
146 | DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER); | |
26a7d938 | 147 | return 0; |
0f113f3e MC |
148 | } |
149 | if (sk_void_num(dso->meth_data) < 1) | |
208fb891 | 150 | return 1; |
0f113f3e MC |
151 | ptr = sk_void_pop(dso->meth_data); |
152 | if (ptr == NULL) { | |
153 | DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE); | |
154 | /* | |
155 | * Should push the value back onto the stack in case of a retry. | |
156 | */ | |
157 | sk_void_push(dso->meth_data, ptr); | |
26a7d938 | 158 | return 0; |
0f113f3e MC |
159 | } |
160 | /* For now I'm not aware of any errors associated with dlclose() */ | |
161 | dlclose(ptr); | |
208fb891 | 162 | return 1; |
0f113f3e | 163 | } |
8f4fac7f | 164 | |
e9a68cfb | 165 | static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname) |
0f113f3e MC |
166 | { |
167 | void *ptr; | |
168 | union { | |
169 | DSO_FUNC_TYPE sym; | |
170 | void *dlret; | |
171 | } u; | |
172 | ||
173 | if ((dso == NULL) || (symname == NULL)) { | |
174 | DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER); | |
26a7d938 | 175 | return NULL; |
0f113f3e MC |
176 | } |
177 | if (sk_void_num(dso->meth_data) < 1) { | |
178 | DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR); | |
26a7d938 | 179 | return NULL; |
0f113f3e MC |
180 | } |
181 | ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1); | |
182 | if (ptr == NULL) { | |
183 | DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE); | |
26a7d938 | 184 | return NULL; |
0f113f3e MC |
185 | } |
186 | u.dlret = dlsym(ptr, symname); | |
187 | if (u.dlret == NULL) { | |
188 | DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE); | |
189 | ERR_add_error_data(4, "symname(", symname, "): ", dlerror()); | |
26a7d938 | 190 | return NULL; |
0f113f3e MC |
191 | } |
192 | return u.sym; | |
193 | } | |
8f4fac7f | 194 | |
cbecb3ac | 195 | static char *dlfcn_merger(DSO *dso, const char *filespec1, |
0f113f3e MC |
196 | const char *filespec2) |
197 | { | |
198 | char *merged; | |
199 | ||
200 | if (!filespec1 && !filespec2) { | |
201 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER); | |
26a7d938 | 202 | return NULL; |
0f113f3e MC |
203 | } |
204 | /* | |
205 | * If the first file specification is a rooted path, it rules. same goes | |
206 | * if the second file specification is missing. | |
207 | */ | |
208 | if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) { | |
297002a3 | 209 | merged = OPENSSL_strdup(filespec1); |
90945fa3 | 210 | if (merged == NULL) { |
0f113f3e | 211 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); |
26a7d938 | 212 | return NULL; |
0f113f3e | 213 | } |
0f113f3e MC |
214 | } |
215 | /* | |
216 | * If the first file specification is missing, the second one rules. | |
217 | */ | |
218 | else if (!filespec1) { | |
297002a3 | 219 | merged = OPENSSL_strdup(filespec2); |
90945fa3 | 220 | if (merged == NULL) { |
0f113f3e | 221 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); |
26a7d938 | 222 | return NULL; |
0f113f3e | 223 | } |
b7573c59 | 224 | } else { |
0f113f3e MC |
225 | /* |
226 | * This part isn't as trivial as it looks. It assumes that the | |
227 | * second file specification really is a directory, and makes no | |
228 | * checks whatsoever. Therefore, the result becomes the | |
229 | * concatenation of filespec2 followed by a slash followed by | |
230 | * filespec1. | |
231 | */ | |
0f113f3e MC |
232 | int spec2len, len; |
233 | ||
234 | spec2len = strlen(filespec2); | |
b7573c59 | 235 | len = spec2len + strlen(filespec1); |
0f113f3e | 236 | |
b7573c59 | 237 | if (spec2len && filespec2[spec2len - 1] == '/') { |
0f113f3e MC |
238 | spec2len--; |
239 | len--; | |
240 | } | |
241 | merged = OPENSSL_malloc(len + 2); | |
90945fa3 | 242 | if (merged == NULL) { |
0f113f3e | 243 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE); |
26a7d938 | 244 | return NULL; |
0f113f3e MC |
245 | } |
246 | strcpy(merged, filespec2); | |
247 | merged[spec2len] = '/'; | |
248 | strcpy(&merged[spec2len + 1], filespec1); | |
249 | } | |
26a7d938 | 250 | return merged; |
0f113f3e | 251 | } |
4a620922 | 252 | |
51c8dc37 | 253 | static char *dlfcn_name_converter(DSO *dso, const char *filename) |
0f113f3e MC |
254 | { |
255 | char *translated; | |
256 | int len, rsize, transform; | |
257 | ||
258 | len = strlen(filename); | |
259 | rsize = len + 1; | |
260 | transform = (strstr(filename, "/") == NULL); | |
261 | if (transform) { | |
262 | /* We will convert this to "%s.so" or "lib%s.so" etc */ | |
e987f9f2 | 263 | rsize += strlen(DSO_EXTENSION); /* The length of ".so" */ |
0f113f3e MC |
264 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) |
265 | rsize += 3; /* The length of "lib" */ | |
266 | } | |
267 | translated = OPENSSL_malloc(rsize); | |
268 | if (translated == NULL) { | |
269 | DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED); | |
26a7d938 | 270 | return NULL; |
0f113f3e MC |
271 | } |
272 | if (transform) { | |
273 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) | |
e987f9f2 | 274 | sprintf(translated, "lib%s" DSO_EXTENSION, filename); |
0f113f3e | 275 | else |
e987f9f2 | 276 | sprintf(translated, "%s" DSO_EXTENSION, filename); |
0f113f3e MC |
277 | } else |
278 | sprintf(translated, "%s", filename); | |
26a7d938 | 279 | return translated; |
0f113f3e MC |
280 | } |
281 | ||
282 | # ifdef __sgi | |
23a22b4c | 283 | /*- |
7ed87653 AP |
284 | This is a quote from IRIX manual for dladdr(3c): |
285 | ||
286 | <dlfcn.h> does not contain a prototype for dladdr or definition of | |
287 | Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional, | |
288 | but contains no dladdr prototype and no IRIX library contains an | |
289 | implementation. Write your own declaration based on the code below. | |
290 | ||
291 | The following code is dependent on internal interfaces that are not | |
292 | part of the IRIX compatibility guarantee; however, there is no future | |
293 | intention to change this interface, so on a practical level, the code | |
294 | below is safe to use on IRIX. | |
c8e1edaa | 295 | */ |
0f113f3e MC |
296 | # include <rld_interface.h> |
297 | # ifndef _RLD_INTERFACE_DLFCN_H_DLADDR | |
298 | # define _RLD_INTERFACE_DLFCN_H_DLADDR | |
7ed87653 | 299 | typedef struct Dl_info { |
0f113f3e MC |
300 | const char *dli_fname; |
301 | void *dli_fbase; | |
302 | const char *dli_sname; | |
303 | void *dli_saddr; | |
304 | int dli_version; | |
305 | int dli_reserved1; | |
306 | long dli_reserved[4]; | |
7ed87653 | 307 | } Dl_info; |
0f113f3e | 308 | # else |
7ed87653 | 309 | typedef struct Dl_info Dl_info; |
0f113f3e MC |
310 | # endif |
311 | # define _RLD_DLADDR 14 | |
7ed87653 AP |
312 | |
313 | static int dladdr(void *address, Dl_info *dl) | |
314 | { | |
0f113f3e MC |
315 | void *v; |
316 | v = _rld_new_interface(_RLD_DLADDR, address, dl); | |
317 | return (int)v; | |
318 | } | |
319 | # endif /* __sgi */ | |
320 | ||
4af14b7b MK |
321 | # ifdef _AIX |
322 | /*- | |
323 | * See IBM's AIX Version 7.2, Technical Reference: | |
324 | * Base Operating System and Extensions, Volume 1 and 2 | |
325 | * https://www.ibm.com/support/knowledgecenter/ssw_aix_72/com.ibm.aix.base/technicalreferences.htm | |
326 | */ | |
327 | # include <sys/ldr.h> | |
328 | # include <errno.h> | |
329 | /* ~ 64 * (sizeof(struct ld_info) + _XOPEN_PATH_MAX + _XOPEN_NAME_MAX) */ | |
330 | # define DLFCN_LDINFO_SIZE 86976 | |
331 | typedef struct Dl_info { | |
332 | const char *dli_fname; | |
333 | } Dl_info; | |
334 | /* | |
335 | * This dladdr()-implementation will also find the ptrgl (Pointer Glue) virtual | |
336 | * address of a function, which is just located in the DATA segment instead of | |
337 | * the TEXT segment. | |
338 | */ | |
d47eb76c | 339 | static int dladdr(void *ptr, Dl_info *dl) |
4af14b7b | 340 | { |
d47eb76c | 341 | uintptr_t addr = (uintptr_t)ptr; |
4af14b7b MK |
342 | unsigned int found = 0; |
343 | struct ld_info *ldinfos, *next_ldi, *this_ldi; | |
344 | ||
ea5def14 | 345 | if ((ldinfos = OPENSSL_malloc(DLFCN_LDINFO_SIZE)) == NULL) { |
4af14b7b MK |
346 | errno = ENOMEM; |
347 | dl->dli_fname = NULL; | |
348 | return 0; | |
349 | } | |
350 | ||
351 | if ((loadquery(L_GETINFO, (void *)ldinfos, DLFCN_LDINFO_SIZE)) < 0) { | |
352 | /*- | |
353 | * Error handling is done through errno and dlerror() reading errno: | |
354 | * ENOMEM (ldinfos buffer is too small), | |
355 | * EINVAL (invalid flags), | |
356 | * EFAULT (invalid ldinfos ptr) | |
357 | */ | |
358 | OPENSSL_free((void *)ldinfos); | |
359 | dl->dli_fname = NULL; | |
360 | return 0; | |
361 | } | |
362 | next_ldi = ldinfos; | |
363 | ||
364 | do { | |
365 | this_ldi = next_ldi; | |
d47eb76c MK |
366 | if (((addr >= (uintptr_t)this_ldi->ldinfo_textorg) |
367 | && (addr < ((uintptr_t)this_ldi->ldinfo_textorg + | |
368 | this_ldi->ldinfo_textsize))) | |
369 | || ((addr >= (uintptr_t)this_ldi->ldinfo_dataorg) | |
370 | && (addr < ((uintptr_t)this_ldi->ldinfo_dataorg + | |
371 | this_ldi->ldinfo_datasize)))) { | |
ea5def14 MK |
372 | char *buffer, *member; |
373 | size_t buffer_sz, member_len; | |
374 | ||
375 | buffer_sz = strlen(this_ldi->ldinfo_filename) + 1; | |
376 | member = this_ldi->ldinfo_filename + buffer_sz; | |
377 | if ((member_len = strlen(member)) > 0) | |
378 | buffer_sz += 1 + member_len + 1; | |
4af14b7b | 379 | found = 1; |
ea5def14 MK |
380 | if ((buffer = OPENSSL_malloc(buffer_sz)) != NULL) { |
381 | OPENSSL_strlcpy(buffer, this_ldi->ldinfo_filename, buffer_sz); | |
382 | if (member_len > 0) { | |
383 | /* | |
384 | * Need to respect a possible member name and not just | |
385 | * returning the path name in this case. See docs: | |
386 | * sys/ldr.h, loadquery() and dlopen()/RTLD_MEMBER. | |
387 | */ | |
388 | OPENSSL_strlcat(buffer, "(", buffer_sz); | |
389 | OPENSSL_strlcat(buffer, member, buffer_sz); | |
390 | OPENSSL_strlcat(buffer, ")", buffer_sz); | |
391 | } | |
392 | dl->dli_fname = buffer; | |
393 | } else { | |
4af14b7b | 394 | errno = ENOMEM; |
ea5def14 | 395 | } |
4af14b7b | 396 | } else { |
ea5def14 MK |
397 | next_ldi = (struct ld_info *)((uintptr_t)this_ldi + |
398 | this_ldi->ldinfo_next); | |
4af14b7b MK |
399 | } |
400 | } while (this_ldi->ldinfo_next && !found); | |
401 | OPENSSL_free((void *)ldinfos); | |
402 | return (found && dl->dli_fname != NULL); | |
403 | } | |
404 | # endif /* _AIX */ | |
405 | ||
cb6ea61c MC |
406 | static int dlfcn_pathbyaddr(void *addr, char *path, int sz) |
407 | { | |
408 | # ifdef HAVE_DLINFO | |
409 | Dl_info dli; | |
410 | int len; | |
411 | ||
412 | if (addr == NULL) { | |
413 | union { | |
414 | int (*f) (void *, char *, int); | |
415 | void *p; | |
416 | } t = { | |
417 | dlfcn_pathbyaddr | |
418 | }; | |
419 | addr = t.p; | |
420 | } | |
421 | ||
422 | if (dladdr(addr, &dli)) { | |
423 | len = (int)strlen(dli.dli_fname); | |
4af14b7b MK |
424 | if (sz <= 0) { |
425 | # ifdef _AIX | |
d47eb76c | 426 | OPENSSL_free((void *)dli.dli_fname); |
4af14b7b | 427 | # endif |
cb6ea61c | 428 | return len + 1; |
4af14b7b | 429 | } |
cb6ea61c MC |
430 | if (len >= sz) |
431 | len = sz - 1; | |
432 | memcpy(path, dli.dli_fname, len); | |
433 | path[len++] = 0; | |
4af14b7b | 434 | # ifdef _AIX |
d47eb76c | 435 | OPENSSL_free((void *)dli.dli_fname); |
4af14b7b | 436 | # endif |
cb6ea61c MC |
437 | return len; |
438 | } | |
439 | ||
440 | ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror()); | |
441 | # endif | |
442 | return -1; | |
443 | } | |
444 | ||
c6cb42e4 | 445 | static void *dlfcn_globallookup(const char *name) |
0f113f3e MC |
446 | { |
447 | void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY); | |
448 | ||
449 | if (handle) { | |
450 | ret = dlsym(handle, name); | |
451 | dlclose(handle); | |
452 | } | |
453 | ||
454 | return ret; | |
455 | } | |
456 | #endif /* DSO_DLFCN */ |