[331] | 1 | /*
|
---|
| 2 | * Copyright 2000-2016 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 | /*
|
---|
| 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 | */
|
---|
| 15 | #ifndef _GNU_SOURCE
|
---|
| 16 | # define _GNU_SOURCE /* make sure dladdr is declared */
|
---|
| 17 | #endif
|
---|
| 18 |
|
---|
| 19 | #include "dso_locl.h"
|
---|
| 20 |
|
---|
| 21 | #ifdef DSO_DLFCN
|
---|
| 22 |
|
---|
| 23 | # ifdef HAVE_DLFCN_H
|
---|
| 24 | # ifdef __osf__
|
---|
| 25 | # define __EXTENSIONS__
|
---|
| 26 | # endif
|
---|
| 27 | # include <dlfcn.h>
|
---|
| 28 | # define HAVE_DLINFO 1
|
---|
| 29 | # if defined(_AIX) || defined(__CYGWIN__) || \
|
---|
| 30 | defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
|
---|
| 31 | (defined(__osf__) && !defined(RTLD_NEXT)) || \
|
---|
| 32 | (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
|
---|
| 33 | defined(__ANDROID__)
|
---|
| 34 | # undef HAVE_DLINFO
|
---|
| 35 | # endif
|
---|
| 36 | # endif
|
---|
| 37 |
|
---|
| 38 | /* Part of the hack in "dlfcn_load" ... */
|
---|
| 39 | # define DSO_MAX_TRANSLATED_SIZE 256
|
---|
| 40 |
|
---|
| 41 | static int dlfcn_load(DSO *dso);
|
---|
| 42 | static int dlfcn_unload(DSO *dso);
|
---|
| 43 | static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
|
---|
| 44 | static char *dlfcn_name_converter(DSO *dso, const char *filename);
|
---|
| 45 | static char *dlfcn_merger(DSO *dso, const char *filespec1,
|
---|
| 46 | const char *filespec2);
|
---|
| 47 | static int dlfcn_pathbyaddr(void *addr, char *path, int sz);
|
---|
| 48 | static void *dlfcn_globallookup(const char *name);
|
---|
| 49 |
|
---|
| 50 | static DSO_METHOD dso_meth_dlfcn = {
|
---|
| 51 | "OpenSSL 'dlfcn' shared library method",
|
---|
| 52 | dlfcn_load,
|
---|
| 53 | dlfcn_unload,
|
---|
| 54 | dlfcn_bind_func,
|
---|
| 55 | NULL, /* ctrl */
|
---|
| 56 | dlfcn_name_converter,
|
---|
| 57 | dlfcn_merger,
|
---|
| 58 | NULL, /* init */
|
---|
| 59 | NULL, /* finish */
|
---|
| 60 | dlfcn_pathbyaddr,
|
---|
| 61 | dlfcn_globallookup
|
---|
| 62 | };
|
---|
| 63 |
|
---|
| 64 | DSO_METHOD *DSO_METHOD_openssl(void)
|
---|
| 65 | {
|
---|
| 66 | return &dso_meth_dlfcn;
|
---|
| 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
|
---|
| 90 |
|
---|
| 91 | /*
|
---|
| 92 | * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
|
---|
| 93 | * (void*) returned from dlopen().
|
---|
| 94 | */
|
---|
| 95 |
|
---|
| 96 | static int dlfcn_load(DSO *dso)
|
---|
| 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;
|
---|
| 102 |
|
---|
| 103 | if (filename == NULL) {
|
---|
| 104 | DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
|
---|
| 105 | goto err;
|
---|
| 106 | }
|
---|
| 107 | # ifdef RTLD_GLOBAL
|
---|
| 108 | if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
|
---|
| 109 | flags |= RTLD_GLOBAL;
|
---|
| 110 | # endif
|
---|
| 111 | ptr = dlopen(filename, flags);
|
---|
| 112 | if (ptr == NULL) {
|
---|
| 113 | DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
|
---|
| 114 | ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
|
---|
| 115 | goto err;
|
---|
| 116 | }
|
---|
| 117 | if (!sk_void_push(dso->meth_data, (char *)ptr)) {
|
---|
| 118 | DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
|
---|
| 119 | goto err;
|
---|
| 120 | }
|
---|
| 121 | /* Success */
|
---|
| 122 | dso->loaded_filename = filename;
|
---|
| 123 | return (1);
|
---|
| 124 | err:
|
---|
| 125 | /* Cleanup! */
|
---|
| 126 | OPENSSL_free(filename);
|
---|
| 127 | if (ptr != NULL)
|
---|
| 128 | dlclose(ptr);
|
---|
| 129 | return (0);
|
---|
| 130 | }
|
---|
| 131 |
|
---|
| 132 | static int dlfcn_unload(DSO *dso)
|
---|
| 133 | {
|
---|
| 134 | void *ptr;
|
---|
| 135 | if (dso == NULL) {
|
---|
| 136 | DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
|
---|
| 137 | return (0);
|
---|
| 138 | }
|
---|
| 139 | if (sk_void_num(dso->meth_data) < 1)
|
---|
| 140 | return (1);
|
---|
| 141 | ptr = sk_void_pop(dso->meth_data);
|
---|
| 142 | if (ptr == NULL) {
|
---|
| 143 | DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
|
---|
| 144 | /*
|
---|
| 145 | * Should push the value back onto the stack in case of a retry.
|
---|
| 146 | */
|
---|
| 147 | sk_void_push(dso->meth_data, ptr);
|
---|
| 148 | return (0);
|
---|
| 149 | }
|
---|
| 150 | /* For now I'm not aware of any errors associated with dlclose() */
|
---|
| 151 | dlclose(ptr);
|
---|
| 152 | return (1);
|
---|
| 153 | }
|
---|
| 154 |
|
---|
| 155 | static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
|
---|
| 156 | {
|
---|
| 157 | void *ptr;
|
---|
| 158 | union {
|
---|
| 159 | DSO_FUNC_TYPE sym;
|
---|
| 160 | void *dlret;
|
---|
| 161 | } u;
|
---|
| 162 |
|
---|
| 163 | if ((dso == NULL) || (symname == NULL)) {
|
---|
| 164 | DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
|
---|
| 165 | return (NULL);
|
---|
| 166 | }
|
---|
| 167 | if (sk_void_num(dso->meth_data) < 1) {
|
---|
| 168 | DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
|
---|
| 169 | return (NULL);
|
---|
| 170 | }
|
---|
| 171 | ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
|
---|
| 172 | if (ptr == NULL) {
|
---|
| 173 | DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
|
---|
| 174 | return (NULL);
|
---|
| 175 | }
|
---|
| 176 | u.dlret = dlsym(ptr, symname);
|
---|
| 177 | if (u.dlret == NULL) {
|
---|
| 178 | DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
|
---|
| 179 | ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
|
---|
| 180 | return (NULL);
|
---|
| 181 | }
|
---|
| 182 | return u.sym;
|
---|
| 183 | }
|
---|
| 184 |
|
---|
| 185 | static char *dlfcn_merger(DSO *dso, const char *filespec1,
|
---|
| 186 | const char *filespec2)
|
---|
| 187 | {
|
---|
| 188 | char *merged;
|
---|
| 189 |
|
---|
| 190 | if (!filespec1 && !filespec2) {
|
---|
| 191 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
|
---|
| 192 | return (NULL);
|
---|
| 193 | }
|
---|
| 194 | /*
|
---|
| 195 | * If the first file specification is a rooted path, it rules. same goes
|
---|
| 196 | * if the second file specification is missing.
|
---|
| 197 | */
|
---|
| 198 | if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
|
---|
| 199 | merged = OPENSSL_strdup(filespec1);
|
---|
| 200 | if (merged == NULL) {
|
---|
| 201 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
|
---|
| 202 | return (NULL);
|
---|
| 203 | }
|
---|
| 204 | }
|
---|
| 205 | /*
|
---|
| 206 | * If the first file specification is missing, the second one rules.
|
---|
| 207 | */
|
---|
| 208 | else if (!filespec1) {
|
---|
| 209 | merged = OPENSSL_strdup(filespec2);
|
---|
| 210 | if (merged == NULL) {
|
---|
| 211 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
|
---|
| 212 | return (NULL);
|
---|
| 213 | }
|
---|
| 214 | } else {
|
---|
| 215 | /*
|
---|
| 216 | * This part isn't as trivial as it looks. It assumes that the
|
---|
| 217 | * second file specification really is a directory, and makes no
|
---|
| 218 | * checks whatsoever. Therefore, the result becomes the
|
---|
| 219 | * concatenation of filespec2 followed by a slash followed by
|
---|
| 220 | * filespec1.
|
---|
| 221 | */
|
---|
| 222 | int spec2len, len;
|
---|
| 223 |
|
---|
| 224 | spec2len = strlen(filespec2);
|
---|
| 225 | len = spec2len + strlen(filespec1);
|
---|
| 226 |
|
---|
| 227 | if (spec2len && filespec2[spec2len - 1] == '/') {
|
---|
| 228 | spec2len--;
|
---|
| 229 | len--;
|
---|
| 230 | }
|
---|
| 231 | merged = OPENSSL_malloc(len + 2);
|
---|
| 232 | if (merged == NULL) {
|
---|
| 233 | DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
|
---|
| 234 | return (NULL);
|
---|
| 235 | }
|
---|
| 236 | strcpy(merged, filespec2);
|
---|
| 237 | merged[spec2len] = '/';
|
---|
| 238 | strcpy(&merged[spec2len + 1], filespec1);
|
---|
| 239 | }
|
---|
| 240 | return (merged);
|
---|
| 241 | }
|
---|
| 242 |
|
---|
| 243 | static char *dlfcn_name_converter(DSO *dso, const char *filename)
|
---|
| 244 | {
|
---|
| 245 | char *translated;
|
---|
| 246 | int len, rsize, transform;
|
---|
| 247 |
|
---|
| 248 | len = strlen(filename);
|
---|
| 249 | rsize = len + 1;
|
---|
| 250 | transform = (strstr(filename, "/") == NULL);
|
---|
| 251 | if (transform) {
|
---|
| 252 | /* We will convert this to "%s.so" or "lib%s.so" etc */
|
---|
| 253 | rsize += strlen(DSO_EXTENSION); /* The length of ".so" */
|
---|
| 254 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
|
---|
| 255 | rsize += 3; /* The length of "lib" */
|
---|
| 256 | }
|
---|
| 257 | translated = OPENSSL_malloc(rsize);
|
---|
| 258 | if (translated == NULL) {
|
---|
| 259 | DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
|
---|
| 260 | return (NULL);
|
---|
| 261 | }
|
---|
| 262 | if (transform) {
|
---|
| 263 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
|
---|
| 264 | sprintf(translated, "lib%s" DSO_EXTENSION, filename);
|
---|
| 265 | else
|
---|
| 266 | sprintf(translated, "%s" DSO_EXTENSION, filename);
|
---|
| 267 | } else
|
---|
| 268 | sprintf(translated, "%s", filename);
|
---|
| 269 | return (translated);
|
---|
| 270 | }
|
---|
| 271 |
|
---|
| 272 | # ifdef __sgi
|
---|
| 273 | /*-
|
---|
| 274 | This is a quote from IRIX manual for dladdr(3c):
|
---|
| 275 |
|
---|
| 276 | <dlfcn.h> does not contain a prototype for dladdr or definition of
|
---|
| 277 | Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
|
---|
| 278 | but contains no dladdr prototype and no IRIX library contains an
|
---|
| 279 | implementation. Write your own declaration based on the code below.
|
---|
| 280 |
|
---|
| 281 | The following code is dependent on internal interfaces that are not
|
---|
| 282 | part of the IRIX compatibility guarantee; however, there is no future
|
---|
| 283 | intention to change this interface, so on a practical level, the code
|
---|
| 284 | below is safe to use on IRIX.
|
---|
| 285 | */
|
---|
| 286 | # include <rld_interface.h>
|
---|
| 287 | # ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
|
---|
| 288 | # define _RLD_INTERFACE_DLFCN_H_DLADDR
|
---|
| 289 | typedef struct Dl_info {
|
---|
| 290 | const char *dli_fname;
|
---|
| 291 | void *dli_fbase;
|
---|
| 292 | const char *dli_sname;
|
---|
| 293 | void *dli_saddr;
|
---|
| 294 | int dli_version;
|
---|
| 295 | int dli_reserved1;
|
---|
| 296 | long dli_reserved[4];
|
---|
| 297 | } Dl_info;
|
---|
| 298 | # else
|
---|
| 299 | typedef struct Dl_info Dl_info;
|
---|
| 300 | # endif
|
---|
| 301 | # define _RLD_DLADDR 14
|
---|
| 302 |
|
---|
| 303 | static int dladdr(void *address, Dl_info *dl)
|
---|
| 304 | {
|
---|
| 305 | void *v;
|
---|
| 306 | v = _rld_new_interface(_RLD_DLADDR, address, dl);
|
---|
| 307 | return (int)v;
|
---|
| 308 | }
|
---|
| 309 | # endif /* __sgi */
|
---|
| 310 |
|
---|
| 311 | static int dlfcn_pathbyaddr(void *addr, char *path, int sz)
|
---|
| 312 | {
|
---|
| 313 | # ifdef HAVE_DLINFO
|
---|
| 314 | Dl_info dli;
|
---|
| 315 | int len;
|
---|
| 316 |
|
---|
| 317 | if (addr == NULL) {
|
---|
| 318 | union {
|
---|
| 319 | int (*f) (void *, char *, int);
|
---|
| 320 | void *p;
|
---|
| 321 | } t = {
|
---|
| 322 | dlfcn_pathbyaddr
|
---|
| 323 | };
|
---|
| 324 | addr = t.p;
|
---|
| 325 | }
|
---|
| 326 |
|
---|
| 327 | if (dladdr(addr, &dli)) {
|
---|
| 328 | len = (int)strlen(dli.dli_fname);
|
---|
| 329 | if (sz <= 0)
|
---|
| 330 | return len + 1;
|
---|
| 331 | if (len >= sz)
|
---|
| 332 | len = sz - 1;
|
---|
| 333 | memcpy(path, dli.dli_fname, len);
|
---|
| 334 | path[len++] = 0;
|
---|
| 335 | return len;
|
---|
| 336 | }
|
---|
| 337 |
|
---|
| 338 | ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
|
---|
| 339 | # endif
|
---|
| 340 | return -1;
|
---|
| 341 | }
|
---|
| 342 |
|
---|
| 343 | static void *dlfcn_globallookup(const char *name)
|
---|
| 344 | {
|
---|
| 345 | void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
|
---|
| 346 |
|
---|
| 347 | if (handle) {
|
---|
| 348 | ret = dlsym(handle, name);
|
---|
| 349 | dlclose(handle);
|
---|
| 350 | }
|
---|
| 351 |
|
---|
| 352 | return ret;
|
---|
| 353 | }
|
---|
| 354 | #endif /* DSO_DLFCN */
|
---|