test/shlibloadtest.c

   1 /*
   2  * Copyright 2016-2018 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 <stdio.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include <openssl/opensslv.h>
  14 #include <openssl/ssl.h>
  15 #include <openssl/ossl_typ.h>
  16 #include "internal/dso_conf.h"
  17
  18 typedef void DSO;
  19
  20 typedef const SSL_METHOD * (*TLS_method_t)(void);
  21 typedef SSL_CTX * (*SSL_CTX_new_t)(const SSL_METHOD *meth);
  22 typedef void (*SSL_CTX_free_t)(SSL_CTX *);
  23 typedef int (*OPENSSL_init_crypto_t)(uint64_t, void *);
  24 typedef int (*OPENSSL_atexit_t)(void (*handler)(void));
  25 typedef unsigned long (*ERR_get_error_t)(void);
  26 typedef unsigned long (*OPENSSL_version_major_t)(void);
  27 typedef unsigned long (*OPENSSL_version_minor_t)(void);
  28 typedef unsigned long (*OPENSSL_version_patch_t)(void);
  29 typedef DSO * (*DSO_dsobyaddr_t)(void (*addr)(void), int flags);
  30 typedef int (*DSO_free_t)(DSO *dso);
  31
  32 typedef enum test_types_en {
  33     CRYPTO_FIRST,
  34     SSL_FIRST,
  35     JUST_CRYPTO,
  36     DSO_REFTEST,
  37     NO_ATEXIT
  38 } TEST_TYPE;
  39
  40 static TEST_TYPE test_type;
  41 static const char *path_crypto;
  42 static const char *path_ssl;
  43 static const char *path_atexit;
  44
  45 #ifdef DSO_DLFCN
  46
  47 # include <dlfcn.h>
  48
  49 # define SHLIB_INIT NULL
  50
  51 typedef void *SHLIB;
  52 typedef void *SHLIB_SYM;
  53
  54 static int shlib_load(const char *filename, SHLIB *lib)
  55 {
  56     int dl_flags = (RTLD_GLOBAL|RTLD_LAZY);
  57 #ifdef _AIX
  58     if (filename[strlen(filename) - 1] == ')')
  59         dl_flags |= RTLD_MEMBER;
  60 #endif
  61     *lib = dlopen(filename, dl_flags);
  62     return *lib == NULL ? 0 : 1;
  63 }
  64
  65 static int shlib_sym(SHLIB lib, const char *symname, SHLIB_SYM *sym)
  66 {
  67     *sym = dlsym(lib, symname);
  68     return *sym != NULL;
  69 }
  70
  71 static int shlib_close(SHLIB lib)
  72 {
  73     return dlclose(lib) != 0 ? 0 : 1;
  74 }
  75 #endif
  76
  77 #ifdef DSO_WIN32
  78
  79 # include <windows.h>
  80
  81 # define SHLIB_INIT 0
  82
  83 typedef HINSTANCE SHLIB;
  84 typedef void *SHLIB_SYM;
  85
  86 static int shlib_load(const char *filename, SHLIB *lib)
  87 {
  88     *lib = LoadLibraryA(filename);
  89     return *lib == NULL ? 0 : 1;
  90 }
  91
  92 static int shlib_sym(SHLIB lib, const char *symname, SHLIB_SYM *sym)
  93 {
  94     *sym = (SHLIB_SYM)GetProcAddress(lib, symname);
  95     return *sym != NULL;
  96 }
  97
  98 static int shlib_close(SHLIB lib)
  99 {
 100     return FreeLibrary(lib) == 0 ? 0 : 1;
 101 }
 102 #endif
 103
 104
 105 #if defined(DSO_DLFCN) || defined(DSO_WIN32)
 106
 107 static int atexit_handler_done = 0;
 108
 109 static void atexit_handler(void)
 110 {
 111     FILE *atexit_file = fopen(path_atexit, "w");
 112
 113     if (atexit_file == NULL)
 114         return;
 115
 116     fprintf(atexit_file, "atexit() run\n");
 117     fclose(atexit_file);
 118     atexit_handler_done++;
 119 }
 120
 121 static int test_lib(void)
 122 {
 123     SHLIB ssllib = SHLIB_INIT;
 124     SHLIB cryptolib = SHLIB_INIT;
 125     SSL_CTX *ctx;
 126     union {
 127         void (*func)(void);
 128         SHLIB_SYM sym;
 129     } symbols[5];
 130     TLS_method_t myTLS_method;
 131     SSL_CTX_new_t mySSL_CTX_new;
 132     SSL_CTX_free_t mySSL_CTX_free;
 133     ERR_get_error_t myERR_get_error;
 134     OPENSSL_version_major_t myOPENSSL_version_major;
 135     OPENSSL_version_minor_t myOPENSSL_version_minor;
 136     OPENSSL_version_patch_t myOPENSSL_version_patch;
 137     OPENSSL_atexit_t myOPENSSL_atexit;
 138     int result = 0;
 139
 140     switch (test_type) {
 141     case JUST_CRYPTO:
 142     case DSO_REFTEST:
 143     case NO_ATEXIT:
 144     case CRYPTO_FIRST:
 145         if (!shlib_load(path_crypto, &cryptolib)) {
 146             fprintf(stderr, "Failed to load libcrypto\n");
 147             goto end;
 148         }
 149         if (test_type != CRYPTO_FIRST)
 150             break;
 151         /* Fall through */
 152
 153     case SSL_FIRST:
 154         if (!shlib_load(path_ssl, &ssllib)) {
 155             fprintf(stderr, "Failed to load libssl\n");
 156             goto end;
 157         }
 158         if (test_type != SSL_FIRST)
 159             break;
 160         if (!shlib_load(path_crypto, &cryptolib)) {
 161             fprintf(stderr, "Failed to load libcrypto\n");
 162             goto end;
 163         }
 164         break;
 165     }
 166
 167     if (test_type == NO_ATEXIT) {
 168         OPENSSL_init_crypto_t myOPENSSL_init_crypto;
 169
 170         if (!shlib_sym(cryptolib, "OPENSSL_init_crypto", &symbols[0].sym)) {
 171             fprintf(stderr, "Failed to load OPENSSL_init_crypto symbol\n");
 172             goto end;
 173         }
 174         myOPENSSL_init_crypto = (OPENSSL_init_crypto_t)symbols[0].func;
 175         if (!myOPENSSL_init_crypto(OPENSSL_INIT_NO_ATEXIT, NULL)) {
 176             fprintf(stderr, "Failed to initialise libcrypto\n");
 177             goto end;
 178         }
 179     }
 180
 181     if (test_type != JUST_CRYPTO
 182             && test_type != DSO_REFTEST
 183             && test_type != NO_ATEXIT) {
 184         if (!shlib_sym(ssllib, "TLS_method", &symbols[0].sym)
 185                 || !shlib_sym(ssllib, "SSL_CTX_new", &symbols[1].sym)
 186                 || !shlib_sym(ssllib, "SSL_CTX_free", &symbols[2].sym)) {
 187             fprintf(stderr, "Failed to load libssl symbols\n");
 188             goto end;
 189         }
 190         myTLS_method = (TLS_method_t)symbols[0].func;
 191         mySSL_CTX_new = (SSL_CTX_new_t)symbols[1].func;
 192         mySSL_CTX_free = (SSL_CTX_free_t)symbols[2].func;
 193         ctx = mySSL_CTX_new(myTLS_method());
 194         if (ctx == NULL) {
 195             fprintf(stderr, "Failed to create SSL_CTX\n");
 196             goto end;
 197         }
 198         mySSL_CTX_free(ctx);
 199     }
 200
 201     if (!shlib_sym(cryptolib, "ERR_get_error", &symbols[0].sym)
 202            || !shlib_sym(cryptolib, "OPENSSL_version_major", &symbols[1].sym)
 203            || !shlib_sym(cryptolib, "OPENSSL_version_minor", &symbols[2].sym)
 204            || !shlib_sym(cryptolib, "OPENSSL_version_patch", &symbols[3].sym)
 205            || !shlib_sym(cryptolib, "OPENSSL_atexit", &symbols[4].sym)) {
 206         fprintf(stderr, "Failed to load libcrypto symbols\n");
 207         goto end;
 208     }
 209     myERR_get_error = (ERR_get_error_t)symbols[0].func;
 210     if (myERR_get_error() != 0) {
 211         fprintf(stderr, "Unexpected ERR_get_error() response\n");
 212         goto end;
 213     }
 214
 215     /* Library and header version should be identical in this test */
 216     myOPENSSL_version_major = (OPENSSL_version_major_t)symbols[1].func;
 217     myOPENSSL_version_minor = (OPENSSL_version_minor_t)symbols[2].func;
 218     myOPENSSL_version_patch = (OPENSSL_version_patch_t)symbols[3].func;
 219     if (myOPENSSL_version_major() != OPENSSL_VERSION_MAJOR
 220             || myOPENSSL_version_minor() != OPENSSL_VERSION_MINOR
 221             || myOPENSSL_version_patch() != OPENSSL_VERSION_PATCH) {
 222         fprintf(stderr, "Invalid library version number\n");
 223         goto end;
 224     }
 225
 226     myOPENSSL_atexit = (OPENSSL_atexit_t)symbols[4].func;
 227     if (!myOPENSSL_atexit(atexit_handler)) {
 228         fprintf(stderr, "Failed to register atexit handler\n");
 229         goto end;
 230     }
 231
 232     if (test_type == DSO_REFTEST) {
 233 # ifdef DSO_DLFCN
 234         DSO_dsobyaddr_t myDSO_dsobyaddr;
 235         DSO_free_t myDSO_free;
 236
 237         /*
 238          * This is resembling the code used in ossl_init_base() and
 239          * OPENSSL_atexit() to block unloading the library after dlclose().
 240          * We are not testing this on Windows, because it is done there in a
 241          * completely different way. Especially as a call to DSO_dsobyaddr()
 242          * will always return an error, because DSO_pathbyaddr() is not
 243          * implemented there.
 244          */
 245         if (!shlib_sym(cryptolib, "DSO_dsobyaddr", &symbols[0].sym)
 246                 || !shlib_sym(cryptolib, "DSO_free", &symbols[1].sym)) {
 247             fprintf(stderr, "Unable to load DSO symbols\n");
 248             goto end;
 249         }
 250
 251         myDSO_dsobyaddr = (DSO_dsobyaddr_t)symbols[0].func;
 252         myDSO_free = (DSO_free_t)symbols[1].func;
 253
 254         {
 255             DSO *hndl;
 256             /* use known symbol from crypto module */
 257             hndl = myDSO_dsobyaddr((void (*)(void))myERR_get_error, 0);
 258             if (hndl == NULL) {
 259                 fprintf(stderr, "DSO_dsobyaddr() failed\n");
 260                 goto end;
 261             }
 262             myDSO_free(hndl);
 263         }
 264 # endif /* DSO_DLFCN */
 265     }
 266
 267     if (!shlib_close(cryptolib)) {
 268         fprintf(stderr, "Failed to close libcrypto\n");
 269         goto end;
 270     }
 271
 272     if (test_type == CRYPTO_FIRST || test_type == SSL_FIRST) {
 273         if (!shlib_close(ssllib)) {
 274             fprintf(stderr, "Failed to close libssl\n");
 275             goto end;
 276         }
 277     }
 278
 279 # if defined(OPENSSL_NO_PINSHARED) \
 280     && defined(__GLIBC__) \
 281     && defined(__GLIBC_PREREQ) \
 282     && defined(OPENSSL_SYS_LINUX)
 283 #  if __GLIBC_PREREQ(2, 3)
 284     /*
 285      * If we didn't pin the so then we are hopefully on a platform that supports
 286      * running atexit() on so unload. If not we might crash. We know this is
 287      * true on linux since glibc 2.2.3
 288      */
 289     if (test_type != NO_ATEXIT && atexit_handler_done != 1) {
 290         fprintf(stderr, "atexit() handler did not run\n");
 291         goto end;
 292     }
 293 #  endif
 294 # endif
 295
 296     result = 1;
 297 end:
 298     return result;
 299 }
 300 #endif
 301
 302
 303 /*
 304  * shlibloadtest should not use the normal test framework because we don't want
 305  * it to link against libcrypto (which the framework uses). The point of the
 306  * test is to check dynamic loading and unloading of libcrypto/libssl.
 307  */
 308 int main(int argc, char *argv[])
 309 {
 310     const char *p;
 311
 312     if (argc != 5) {
 313         fprintf(stderr, "Incorrect number of arguments\n");
 314         return 1;
 315     }
 316
 317     p = argv[1];
 318
 319     if (strcmp(p, "-crypto_first") == 0) {
 320         test_type = CRYPTO_FIRST;
 321     } else if (strcmp(p, "-ssl_first") == 0) {
 322         test_type = SSL_FIRST;
 323     } else if (strcmp(p, "-just_crypto") == 0) {
 324         test_type = JUST_CRYPTO;
 325     } else if (strcmp(p, "-dso_ref") == 0) {
 326         test_type = DSO_REFTEST;
 327     } else if (strcmp(p, "-no_atexit") == 0) {
 328         test_type = NO_ATEXIT;
 329     } else {
 330         fprintf(stderr, "Unrecognised argument\n");
 331         return 1;
 332     }
 333     path_crypto = argv[2];
 334     path_ssl = argv[3];
 335     path_atexit = argv[4];
 336     if (path_crypto == NULL || path_ssl == NULL) {
 337         fprintf(stderr, "Invalid libcrypto/libssl path\n");
 338         return 1;
 339     }
 340
 341 #if defined(DSO_DLFCN) || defined(DSO_WIN32)
 342     if (!test_lib())
 343         return 1;
 344 #endif
 345     return 0;
 346 }