crypto/err/err.c

   1 /*
   2  * Copyright 1995-2018 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 <stdarg.h>
  12 #include <string.h>
  13 #include "internal/cryptlib_int.h"
  14 #include "internal/err.h"
  15 #include "internal/err_int.h"
  16 #include <openssl/err.h>
  17 #include <openssl/crypto.h>
  18 #include <openssl/buffer.h>
  19 #include <openssl/bio.h>
  20 #include <openssl/opensslconf.h>
  21 #include "internal/thread_once.h"
  22 #include "internal/ctype.h"
  23 #include "internal/constant_time_locl.h"
  24 #include "e_os.h"
  25
  26 static int err_load_strings(const ERR_STRING_DATA *str);
  27
  28 static void ERR_STATE_free(ERR_STATE *s);
  29 #ifndef OPENSSL_NO_ERR
  30 static ERR_STRING_DATA ERR_str_libraries[] = {
  31     {ERR_PACK(ERR_LIB_NONE, 0, 0), "unknown library"},
  32     {ERR_PACK(ERR_LIB_SYS, 0, 0), "system library"},
  33     {ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines"},
  34     {ERR_PACK(ERR_LIB_RSA, 0, 0), "rsa routines"},
  35     {ERR_PACK(ERR_LIB_DH, 0, 0), "Diffie-Hellman routines"},
  36     {ERR_PACK(ERR_LIB_EVP, 0, 0), "digital envelope routines"},
  37     {ERR_PACK(ERR_LIB_BUF, 0, 0), "memory buffer routines"},
  38     {ERR_PACK(ERR_LIB_OBJ, 0, 0), "object identifier routines"},
  39     {ERR_PACK(ERR_LIB_PEM, 0, 0), "PEM routines"},
  40     {ERR_PACK(ERR_LIB_DSA, 0, 0), "dsa routines"},
  41     {ERR_PACK(ERR_LIB_X509, 0, 0), "x509 certificate routines"},
  42     {ERR_PACK(ERR_LIB_ASN1, 0, 0), "asn1 encoding routines"},
  43     {ERR_PACK(ERR_LIB_CONF, 0, 0), "configuration file routines"},
  44     {ERR_PACK(ERR_LIB_CRYPTO, 0, 0), "common libcrypto routines"},
  45     {ERR_PACK(ERR_LIB_EC, 0, 0), "elliptic curve routines"},
  46     {ERR_PACK(ERR_LIB_ECDSA, 0, 0), "ECDSA routines"},
  47     {ERR_PACK(ERR_LIB_ECDH, 0, 0), "ECDH routines"},
  48     {ERR_PACK(ERR_LIB_SSL, 0, 0), "SSL routines"},
  49     {ERR_PACK(ERR_LIB_BIO, 0, 0), "BIO routines"},
  50     {ERR_PACK(ERR_LIB_PKCS7, 0, 0), "PKCS7 routines"},
  51     {ERR_PACK(ERR_LIB_X509V3, 0, 0), "X509 V3 routines"},
  52     {ERR_PACK(ERR_LIB_PKCS12, 0, 0), "PKCS12 routines"},
  53     {ERR_PACK(ERR_LIB_RAND, 0, 0), "random number generator"},
  54     {ERR_PACK(ERR_LIB_DSO, 0, 0), "DSO support routines"},
  55     {ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines"},
  56     {ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines"},
  57     {ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines"},
  58     {ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines"},
  59     {ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines"},
  60     {ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines"},
  61     {ERR_PACK(ERR_LIB_CRMF, 0, 0), "CRMF routines"},
  62     {ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines"},
  63     {ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines"},
  64     {ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC routines"},
  65     {ERR_PACK(ERR_LIB_KDF, 0, 0), "KDF routines"},
  66     {ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines"},
  67     {ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines"},
  68     {ERR_PACK(ERR_LIB_ESS, 0, 0), "ESS routines"},
  69     {ERR_PACK(ERR_LIB_PROV, 0, 0), "Provider routines"},
  70     {0, NULL},
  71 };
  72
  73 static ERR_STRING_DATA ERR_str_functs[] = {
  74     {ERR_PACK(0, SYS_F_FOPEN, 0), "fopen"},
  75     {ERR_PACK(0, SYS_F_CONNECT, 0), "connect"},
  76     {ERR_PACK(0, SYS_F_GETSERVBYNAME, 0), "getservbyname"},
  77     {ERR_PACK(0, SYS_F_SOCKET, 0), "socket"},
  78     {ERR_PACK(0, SYS_F_IOCTLSOCKET, 0), "ioctlsocket"},
  79     {ERR_PACK(0, SYS_F_BIND, 0), "bind"},
  80     {ERR_PACK(0, SYS_F_LISTEN, 0), "listen"},
  81     {ERR_PACK(0, SYS_F_ACCEPT, 0), "accept"},
  82 # ifdef OPENSSL_SYS_WINDOWS
  83     {ERR_PACK(0, SYS_F_WSASTARTUP, 0), "WSAstartup"},
  84 # endif
  85     {ERR_PACK(0, SYS_F_OPENDIR, 0), "opendir"},
  86     {ERR_PACK(0, SYS_F_FREAD, 0), "fread"},
  87     {ERR_PACK(0, SYS_F_GETADDRINFO, 0), "getaddrinfo"},
  88     {ERR_PACK(0, SYS_F_GETNAMEINFO, 0), "getnameinfo"},
  89     {ERR_PACK(0, SYS_F_SETSOCKOPT, 0), "setsockopt"},
  90     {ERR_PACK(0, SYS_F_GETSOCKOPT, 0), "getsockopt"},
  91     {ERR_PACK(0, SYS_F_GETSOCKNAME, 0), "getsockname"},
  92     {ERR_PACK(0, SYS_F_GETHOSTBYNAME, 0), "gethostbyname"},
  93     {ERR_PACK(0, SYS_F_FFLUSH, 0), "fflush"},
  94     {ERR_PACK(0, SYS_F_OPEN, 0), "open"},
  95     {ERR_PACK(0, SYS_F_CLOSE, 0), "close"},
  96     {ERR_PACK(0, SYS_F_IOCTL, 0), "ioctl"},
  97     {ERR_PACK(0, SYS_F_STAT, 0), "stat"},
  98     {ERR_PACK(0, SYS_F_FCNTL, 0), "fcntl"},
  99     {ERR_PACK(0, SYS_F_FSTAT, 0), "fstat"},
 100     {0, NULL},
 101 };
 102
 103 static ERR_STRING_DATA ERR_str_reasons[] = {
 104     {ERR_R_SYS_LIB, "system lib"},
 105     {ERR_R_BN_LIB, "BN lib"},
 106     {ERR_R_RSA_LIB, "RSA lib"},
 107     {ERR_R_DH_LIB, "DH lib"},
 108     {ERR_R_EVP_LIB, "EVP lib"},
 109     {ERR_R_BUF_LIB, "BUF lib"},
 110     {ERR_R_OBJ_LIB, "OBJ lib"},
 111     {ERR_R_PEM_LIB, "PEM lib"},
 112     {ERR_R_DSA_LIB, "DSA lib"},
 113     {ERR_R_X509_LIB, "X509 lib"},
 114     {ERR_R_ASN1_LIB, "ASN1 lib"},
 115     {ERR_R_EC_LIB, "EC lib"},
 116     {ERR_R_BIO_LIB, "BIO lib"},
 117     {ERR_R_PKCS7_LIB, "PKCS7 lib"},
 118     {ERR_R_X509V3_LIB, "X509V3 lib"},
 119     {ERR_R_ENGINE_LIB, "ENGINE lib"},
 120     {ERR_R_UI_LIB, "UI lib"},
 121     {ERR_R_OSSL_STORE_LIB, "STORE lib"},
 122     {ERR_R_ECDSA_LIB, "ECDSA lib"},
 123
 124     {ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
 125     {ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
 126
 127     {ERR_R_FATAL, "fatal"},
 128     {ERR_R_MALLOC_FAILURE, "malloc failure"},
 129     {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
 130      "called a function you should not call"},
 131     {ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
 132     {ERR_R_INTERNAL_ERROR, "internal error"},
 133     {ERR_R_DISABLED, "called a function that was disabled at compile-time"},
 134     {ERR_R_INIT_FAIL, "init fail"},
 135     {ERR_R_OPERATION_FAIL, "operation fail"},
 136
 137     {0, NULL},
 138 };
 139 #endif
 140
 141 static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
 142 static int set_err_thread_local;
 143 static CRYPTO_THREAD_LOCAL err_thread_local;
 144
 145 static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
 146 static CRYPTO_RWLOCK *err_string_lock;
 147
 148 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
 149
 150 /*
 151  * The internal state
 152  */
 153
 154 static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
 155 static int int_err_library_number = ERR_LIB_USER;
 156
 157 static unsigned long get_error_values(int inc, int top, const char **file,
 158                                       int *line, const char **data,
 159                                       int *flags);
 160
 161 static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
 162 {
 163     unsigned long ret, l;
 164
 165     l = a->error;
 166     ret = l ^ ERR_GET_LIB(l) ^ ERR_GET_FUNC(l);
 167     return (ret ^ ret % 19 * 13);
 168 }
 169
 170 static int err_string_data_cmp(const ERR_STRING_DATA *a,
 171                                const ERR_STRING_DATA *b)
 172 {
 173     if (a->error == b->error)
 174         return 0;
 175     return a->error > b->error ? 1 : -1;
 176 }
 177
 178 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
 179 {
 180     ERR_STRING_DATA *p = NULL;
 181
 182     CRYPTO_THREAD_read_lock(err_string_lock);
 183     p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
 184     CRYPTO_THREAD_unlock(err_string_lock);
 185
 186     return p;
 187 }
 188
 189 #ifndef OPENSSL_NO_ERR
 190 /* A measurement on Linux 2018-11-21 showed about 3.5kib */
 191 # define SPACE_SYS_STR_REASONS 4 * 1024
 192 # define NUM_SYS_STR_REASONS 127
 193
 194 static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
 195 /*
 196  * SYS_str_reasons is filled with copies of strerror() results at
 197  * initialization. 'errno' values up to 127 should cover all usual errors,
 198  * others will be displayed numerically by ERR_error_string. It is crucial
 199  * that we have something for each reason code that occurs in
 200  * ERR_str_reasons, or bogus reason strings will be returned for SYSerr(),
 201  * which always gets an errno value and never one of those 'standard' reason
 202  * codes.
 203  */
 204
 205 static void build_SYS_str_reasons(void)
 206 {
 207     /* OPENSSL_malloc cannot be used here, use static storage instead */
 208     static char strerror_pool[SPACE_SYS_STR_REASONS];
 209     char *cur = strerror_pool;
 210     size_t cnt = 0;
 211     static int init = 1;
 212     int i;
 213     int saveerrno = get_last_sys_error();
 214
 215     CRYPTO_THREAD_write_lock(err_string_lock);
 216     if (!init) {
 217         CRYPTO_THREAD_unlock(err_string_lock);
 218         return;
 219     }
 220
 221     for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
 222         ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
 223
 224         str->error = ERR_PACK(ERR_LIB_SYS, 0, i);
 225         if (str->string == NULL) {
 226             if (openssl_strerror_r(i, cur, sizeof(strerror_pool) - cnt)) {
 227                 size_t l = strlen(cur);
 228
 229                 str->string = cur;
 230                 cnt += l;
 231                 if (cnt > sizeof(strerror_pool))
 232                     cnt = sizeof(strerror_pool);
 233                 cur += l;
 234
 235                 /*
 236                  * VMS has an unusual quirk of adding spaces at the end of
 237                  * some (most? all?) messages.  Lets trim them off.
 238                  */
 239                 while (ossl_isspace(cur[-1])) {
 240                     cur--;
 241                     cnt--;
 242                 }
 243                 *cur++ = '\0';
 244                 cnt++;
 245             }
 246         }
 247         if (str->string == NULL)
 248             str->string = "unknown";
 249     }
 250
 251     /*
 252      * Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL}, as
 253      * required by ERR_load_strings.
 254      */
 255
 256     init = 0;
 257
 258     CRYPTO_THREAD_unlock(err_string_lock);
 259     /* openssl_strerror_r could change errno, but we want to preserve it */
 260     set_sys_error(saveerrno);
 261     err_load_strings(SYS_str_reasons);
 262 }
 263 #endif
 264
 265 #define err_clear_data(p, i) \
 266         do { \
 267             if ((p)->err_data_flags[i] & ERR_TXT_MALLOCED) {\
 268                 OPENSSL_free((p)->err_data[i]); \
 269                 (p)->err_data[i] = NULL; \
 270             } \
 271             (p)->err_data_flags[i] = 0; \
 272         } while (0)
 273
 274 #define err_clear(p, i) \
 275         do { \
 276             err_clear_data(p, i); \
 277             (p)->err_flags[i] = 0; \
 278             (p)->err_buffer[i] = 0; \
 279             (p)->err_file[i] = NULL; \
 280             (p)->err_line[i] = -1; \
 281         } while (0)
 282
 283 static void ERR_STATE_free(ERR_STATE *s)
 284 {
 285     int i;
 286
 287     if (s == NULL)
 288         return;
 289     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 290         err_clear_data(s, i);
 291     }
 292     OPENSSL_free(s);
 293 }
 294
 295 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
 296 {
 297     if (!OPENSSL_init_crypto(0, NULL))
 298         return 0;
 299     err_string_lock = CRYPTO_THREAD_lock_new();
 300     if (err_string_lock == NULL)
 301         return 0;
 302     int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
 303                                             err_string_data_cmp);
 304     if (int_error_hash == NULL) {
 305         CRYPTO_THREAD_lock_free(err_string_lock);
 306         err_string_lock = NULL;
 307         return 0;
 308     }
 309     return 1;
 310 }
 311
 312 void err_cleanup(void)
 313 {
 314     if (set_err_thread_local != 0)
 315         CRYPTO_THREAD_cleanup_local(&err_thread_local);
 316     CRYPTO_THREAD_lock_free(err_string_lock);
 317     err_string_lock = NULL;
 318     lh_ERR_STRING_DATA_free(int_error_hash);
 319     int_error_hash = NULL;
 320 }
 321
 322 /*
 323  * Legacy; pack in the library.
 324  */
 325 static void err_patch(int lib, ERR_STRING_DATA *str)
 326 {
 327     unsigned long plib = ERR_PACK(lib, 0, 0);
 328
 329     for (; str->error != 0; str++)
 330         str->error |= plib;
 331 }
 332
 333 /*
 334  * Hash in |str| error strings. Assumes the URN_ONCE was done.
 335  */
 336 static int err_load_strings(const ERR_STRING_DATA *str)
 337 {
 338     CRYPTO_THREAD_write_lock(err_string_lock);
 339     for (; str->error; str++)
 340         (void)lh_ERR_STRING_DATA_insert(int_error_hash,
 341                                        (ERR_STRING_DATA *)str);
 342     CRYPTO_THREAD_unlock(err_string_lock);
 343     return 1;
 344 }
 345
 346 int ERR_load_ERR_strings(void)
 347 {
 348 #ifndef OPENSSL_NO_ERR
 349     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 350         return 0;
 351
 352     err_load_strings(ERR_str_libraries);
 353     err_load_strings(ERR_str_reasons);
 354     err_patch(ERR_LIB_SYS, ERR_str_functs);
 355     err_load_strings(ERR_str_functs);
 356     build_SYS_str_reasons();
 357 #endif
 358     return 1;
 359 }
 360
 361 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
 362 {
 363     if (ERR_load_ERR_strings() == 0)
 364         return 0;
 365
 366     err_patch(lib, str);
 367     err_load_strings(str);
 368     return 1;
 369 }
 370
 371 int ERR_load_strings_const(const ERR_STRING_DATA *str)
 372 {
 373     if (ERR_load_ERR_strings() == 0)
 374         return 0;
 375     err_load_strings(str);
 376     return 1;
 377 }
 378
 379 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
 380 {
 381     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 382         return 0;
 383
 384     CRYPTO_THREAD_write_lock(err_string_lock);
 385     /*
 386      * We don't need to ERR_PACK the lib, since that was done (to
 387      * the table) when it was loaded.
 388      */
 389     for (; str->error; str++)
 390         (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
 391     CRYPTO_THREAD_unlock(err_string_lock);
 392
 393     return 1;
 394 }
 395
 396 void err_free_strings_int(void)
 397 {
 398     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 399         return;
 400 }
 401
 402 /********************************************************/
 403
 404 void ERR_put_error(int lib, int func, int reason, const char *file, int line)
 405 {
 406     ERR_STATE *es;
 407
 408 #ifdef _OSD_POSIX
 409     /*
 410      * In the BS2000-OSD POSIX subsystem, the compiler generates path names
 411      * in the form "*POSIX(/etc/passwd)". This dirty hack strips them to
 412      * something sensible. @@@ We shouldn't modify a const string, though.
 413      */
 414     if (strncmp(file, "*POSIX(", sizeof("*POSIX(") - 1) == 0) {
 415         char *end;
 416
 417         /* Skip the "*POSIX(" prefix */
 418         file += sizeof("*POSIX(") - 1;
 419         end = &file[strlen(file) - 1];
 420         if (*end == ')')
 421             *end = '\0';
 422         /* Optional: use the basename of the path only. */
 423         if ((end = strrchr(file, '/')) != NULL)
 424             file = &end[1];
 425     }
 426 #endif
 427     es = ERR_get_state();
 428     if (es == NULL)
 429         return;
 430
 431     es->top = (es->top + 1) % ERR_NUM_ERRORS;
 432     if (es->top == es->bottom)
 433         es->bottom = (es->bottom + 1) % ERR_NUM_ERRORS;
 434     es->err_flags[es->top] = 0;
 435     es->err_buffer[es->top] = ERR_PACK(lib, func, reason);
 436     es->err_file[es->top] = file;
 437     es->err_line[es->top] = line;
 438     err_clear_data(es, es->top);
 439 }
 440
 441 void ERR_clear_error(void)
 442 {
 443     int i;
 444     ERR_STATE *es;
 445
 446     es = ERR_get_state();
 447     if (es == NULL)
 448         return;
 449
 450     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 451         err_clear(es, i);
 452     }
 453     es->top = es->bottom = 0;
 454 }
 455
 456 unsigned long ERR_get_error(void)
 457 {
 458     return get_error_values(1, 0, NULL, NULL, NULL, NULL);
 459 }
 460
 461 unsigned long ERR_get_error_line(const char **file, int *line)
 462 {
 463     return get_error_values(1, 0, file, line, NULL, NULL);
 464 }
 465
 466 unsigned long ERR_get_error_line_data(const char **file, int *line,
 467                                       const char **data, int *flags)
 468 {
 469     return get_error_values(1, 0, file, line, data, flags);
 470 }
 471
 472 unsigned long ERR_peek_error(void)
 473 {
 474     return get_error_values(0, 0, NULL, NULL, NULL, NULL);
 475 }
 476
 477 unsigned long ERR_peek_error_line(const char **file, int *line)
 478 {
 479     return get_error_values(0, 0, file, line, NULL, NULL);
 480 }
 481
 482 unsigned long ERR_peek_error_line_data(const char **file, int *line,
 483                                        const char **data, int *flags)
 484 {
 485     return get_error_values(0, 0, file, line, data, flags);
 486 }
 487
 488 unsigned long ERR_peek_last_error(void)
 489 {
 490     return get_error_values(0, 1, NULL, NULL, NULL, NULL);
 491 }
 492
 493 unsigned long ERR_peek_last_error_line(const char **file, int *line)
 494 {
 495     return get_error_values(0, 1, file, line, NULL, NULL);
 496 }
 497
 498 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
 499                                             const char **data, int *flags)
 500 {
 501     return get_error_values(0, 1, file, line, data, flags);
 502 }
 503
 504 static unsigned long get_error_values(int inc, int top, const char **file,
 505                                       int *line, const char **data,
 506                                       int *flags)
 507 {
 508     int i = 0;
 509     ERR_STATE *es;
 510     unsigned long ret;
 511
 512     es = ERR_get_state();
 513     if (es == NULL)
 514         return 0;
 515
 516     if (inc && top) {
 517         if (file)
 518             *file = "";
 519         if (line)
 520             *line = 0;
 521         if (data)
 522             *data = "";
 523         if (flags)
 524             *flags = 0;
 525
 526         return ERR_R_INTERNAL_ERROR;
 527     }
 528
 529     while (es->bottom != es->top) {
 530         if (es->err_flags[es->top] & ERR_FLAG_CLEAR) {
 531             err_clear(es, es->top);
 532             es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
 533             continue;
 534         }
 535         i = (es->bottom + 1) % ERR_NUM_ERRORS;
 536         if (es->err_flags[i] & ERR_FLAG_CLEAR) {
 537             es->bottom = i;
 538             err_clear(es, es->bottom);
 539             continue;
 540         }
 541         break;
 542     }
 543
 544     if (es->bottom == es->top)
 545         return 0;
 546
 547     if (top)
 548         i = es->top;            /* last error */
 549     else
 550         i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */
 551
 552     ret = es->err_buffer[i];
 553     if (inc) {
 554         es->bottom = i;
 555         es->err_buffer[i] = 0;
 556     }
 557
 558     if (file != NULL && line != NULL) {
 559         if (es->err_file[i] == NULL) {
 560             *file = "NA";
 561             *line = 0;
 562         } else {
 563             *file = es->err_file[i];
 564             *line = es->err_line[i];
 565         }
 566     }
 567
 568     if (data == NULL) {
 569         if (inc) {
 570             err_clear_data(es, i);
 571         }
 572     } else {
 573         if (es->err_data[i] == NULL) {
 574             *data = "";
 575             if (flags != NULL)
 576                 *flags = 0;
 577         } else {
 578             *data = es->err_data[i];
 579             if (flags != NULL)
 580                 *flags = es->err_data_flags[i];
 581         }
 582     }
 583     return ret;
 584 }
 585
 586 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
 587 {
 588     char lsbuf[64], fsbuf[64], rsbuf[64];
 589     const char *ls, *fs, *rs;
 590     unsigned long l, f, r;
 591
 592     if (len == 0)
 593         return;
 594
 595     l = ERR_GET_LIB(e);
 596     ls = ERR_lib_error_string(e);
 597     if (ls == NULL) {
 598         BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
 599         ls = lsbuf;
 600     }
 601
 602     fs = ERR_func_error_string(e);
 603     f = ERR_GET_FUNC(e);
 604     if (fs == NULL) {
 605         BIO_snprintf(fsbuf, sizeof(fsbuf), "func(%lu)", f);
 606         fs = fsbuf;
 607     }
 608
 609     rs = ERR_reason_error_string(e);
 610     r = ERR_GET_REASON(e);
 611     if (rs == NULL) {
 612         BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
 613         rs = rsbuf;
 614     }
 615
 616     BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, fs, rs);
 617     if (strlen(buf) == len - 1) {
 618         /* Didn't fit; use a minimal format. */
 619         BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, f, r);
 620     }
 621 }
 622
 623 /*
 624  * ERR_error_string_n should be used instead for ret != NULL as
 625  * ERR_error_string cannot know how large the buffer is
 626  */
 627 char *ERR_error_string(unsigned long e, char *ret)
 628 {
 629     static char buf[256];
 630
 631     if (ret == NULL)
 632         ret = buf;
 633     ERR_error_string_n(e, ret, (int)sizeof(buf));
 634     return ret;
 635 }
 636
 637 const char *ERR_lib_error_string(unsigned long e)
 638 {
 639     ERR_STRING_DATA d, *p;
 640     unsigned long l;
 641
 642     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 643         return NULL;
 644     }
 645
 646     l = ERR_GET_LIB(e);
 647     d.error = ERR_PACK(l, 0, 0);
 648     p = int_err_get_item(&d);
 649     return ((p == NULL) ? NULL : p->string);
 650 }
 651
 652 const char *ERR_func_error_string(unsigned long e)
 653 {
 654     ERR_STRING_DATA d, *p;
 655     unsigned long l, f;
 656
 657     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 658         return NULL;
 659     }
 660
 661     l = ERR_GET_LIB(e);
 662     f = ERR_GET_FUNC(e);
 663     d.error = ERR_PACK(l, f, 0);
 664     p = int_err_get_item(&d);
 665     return ((p == NULL) ? NULL : p->string);
 666 }
 667
 668 const char *ERR_reason_error_string(unsigned long e)
 669 {
 670     ERR_STRING_DATA d, *p = NULL;
 671     unsigned long l, r;
 672
 673     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 674         return NULL;
 675     }
 676
 677     l = ERR_GET_LIB(e);
 678     r = ERR_GET_REASON(e);
 679     d.error = ERR_PACK(l, 0, r);
 680     p = int_err_get_item(&d);
 681     if (!p) {
 682         d.error = ERR_PACK(0, 0, r);
 683         p = int_err_get_item(&d);
 684     }
 685     return ((p == NULL) ? NULL : p->string);
 686 }
 687
 688 void err_delete_thread_state(void)
 689 {
 690     ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
 691     if (state == NULL)
 692         return;
 693
 694     CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 695     ERR_STATE_free(state);
 696 }
 697
 698 #if !OPENSSL_API_1_1_0
 699 void ERR_remove_thread_state(void *dummy)
 700 {
 701 }
 702 #endif
 703
 704 #if !OPENSSL_API_1_0_0
 705 void ERR_remove_state(unsigned long pid)
 706 {
 707 }
 708 #endif
 709
 710 DEFINE_RUN_ONCE_STATIC(err_do_init)
 711 {
 712     set_err_thread_local = 1;
 713     return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
 714 }
 715
 716 ERR_STATE *ERR_get_state(void)
 717 {
 718     ERR_STATE *state;
 719     int saveerrno = get_last_sys_error();
 720
 721     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 722         return NULL;
 723
 724     if (!RUN_ONCE(&err_init, err_do_init))
 725         return NULL;
 726
 727     state = CRYPTO_THREAD_get_local(&err_thread_local);
 728     if (state == (ERR_STATE*)-1)
 729         return NULL;
 730
 731     if (state == NULL) {
 732         if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 733             return NULL;
 734
 735         if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
 736             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 737             return NULL;
 738         }
 739
 740         if (!ossl_init_thread_start(OPENSSL_INIT_THREAD_ERR_STATE)
 741                 || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
 742             ERR_STATE_free(state);
 743             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 744             return NULL;
 745         }
 746
 747         /* Ignore failures from these */
 748         OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 749     }
 750
 751     set_sys_error(saveerrno);
 752     return state;
 753 }
 754
 755 /*
 756  * err_shelve_state returns the current thread local error state
 757  * and freezes the error module until err_unshelve_state is called.
 758  */
 759 int err_shelve_state(void **state)
 760 {
 761     int saveerrno = get_last_sys_error();
 762
 763     /*
 764      * Note, at present our only caller is OPENSSL_init_crypto(), indirectly
 765      * via ossl_init_load_crypto_nodelete(), by which point the requested
 766      * "base" initialization has already been performed, so the below call is a
 767      * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
 768      *
 769      * If are no other valid callers of this function, the call below can be
 770      * removed, avoiding the re-entry into OPENSSL_init_crypto().  If there are
 771      * potential uses that are not from inside OPENSSL_init_crypto(), then this
 772      * call is needed, but some care is required to make sure that the re-entry
 773      * remains a NOOP.
 774      */
 775     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 776         return 0;
 777
 778     if (!RUN_ONCE(&err_init, err_do_init))
 779         return 0;
 780
 781     *state = CRYPTO_THREAD_get_local(&err_thread_local);
 782     if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 783         return 0;
 784
 785     set_sys_error(saveerrno);
 786     return 1;
 787 }
 788
 789 /*
 790  * err_unshelve_state restores the error state that was returned
 791  * by err_shelve_state previously.
 792  */
 793 void err_unshelve_state(void* state)
 794 {
 795     if (state != (void*)-1)
 796         CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
 797 }
 798
 799 int ERR_get_next_error_library(void)
 800 {
 801     int ret;
 802
 803     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 804         return 0;
 805
 806     CRYPTO_THREAD_write_lock(err_string_lock);
 807     ret = int_err_library_number++;
 808     CRYPTO_THREAD_unlock(err_string_lock);
 809     return ret;
 810 }
 811
 812 static int err_set_error_data_int(char *data, int flags)
 813 {
 814     ERR_STATE *es;
 815     int i;
 816
 817     es = ERR_get_state();
 818     if (es == NULL)
 819         return 0;
 820
 821     i = es->top;
 822
 823     err_clear_data(es, i);
 824     es->err_data[i] = data;
 825     es->err_data_flags[i] = flags;
 826
 827     return 1;
 828 }
 829
 830 void ERR_set_error_data(char *data, int flags)
 831 {
 832     /*
 833      * This function is void so we cannot propagate the error return. Since it
 834      * is also in the public API we can't change the return type.
 835      */
 836     err_set_error_data_int(data, flags);
 837 }
 838
 839 void ERR_add_error_data(int num, ...)
 840 {
 841     va_list args;
 842     va_start(args, num);
 843     ERR_add_error_vdata(num, args);
 844     va_end(args);
 845 }
 846
 847 void ERR_add_error_vdata(int num, va_list args)
 848 {
 849     int i, n, s;
 850     char *str, *p, *a;
 851
 852     s = 80;
 853     if ((str = OPENSSL_malloc(s + 1)) == NULL) {
 854         /* ERRerr(ERR_F_ERR_ADD_ERROR_VDATA, ERR_R_MALLOC_FAILURE); */
 855         return;
 856     }
 857     str[0] = '\0';
 858
 859     n = 0;
 860     for (i = 0; i < num; i++) {
 861         a = va_arg(args, char *);
 862         if (a == NULL)
 863             a = "<NULL>";
 864         n += strlen(a);
 865         if (n > s) {
 866             s = n + 20;
 867             p = OPENSSL_realloc(str, s + 1);
 868             if (p == NULL) {
 869                 OPENSSL_free(str);
 870                 return;
 871             }
 872             str = p;
 873         }
 874         OPENSSL_strlcat(str, a, (size_t)s + 1);
 875     }
 876     if (!err_set_error_data_int(str, ERR_TXT_MALLOCED | ERR_TXT_STRING))
 877         OPENSSL_free(str);
 878 }
 879
 880 int ERR_set_mark(void)
 881 {
 882     ERR_STATE *es;
 883
 884     es = ERR_get_state();
 885     if (es == NULL)
 886         return 0;
 887
 888     if (es->bottom == es->top)
 889         return 0;
 890     es->err_flags[es->top] |= ERR_FLAG_MARK;
 891     return 1;
 892 }
 893
 894 int ERR_pop_to_mark(void)
 895 {
 896     ERR_STATE *es;
 897
 898     es = ERR_get_state();
 899     if (es == NULL)
 900         return 0;
 901
 902     while (es->bottom != es->top
 903            && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
 904         err_clear(es, es->top);
 905         es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
 906     }
 907
 908     if (es->bottom == es->top)
 909         return 0;
 910     es->err_flags[es->top] &= ~ERR_FLAG_MARK;
 911     return 1;
 912 }
 913
 914 int ERR_clear_last_mark(void)
 915 {
 916     ERR_STATE *es;
 917     int top;
 918
 919     es = ERR_get_state();
 920     if (es == NULL)
 921         return 0;
 922
 923     top = es->top;
 924     while (es->bottom != top
 925            && (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
 926         top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
 927     }
 928
 929     if (es->bottom == top)
 930         return 0;
 931     es->err_flags[top] &= ~ERR_FLAG_MARK;
 932     return 1;
 933 }
 934
 935 void err_clear_last_constant_time(int clear)
 936 {
 937     ERR_STATE *es;
 938     int top;
 939
 940     es = ERR_get_state();
 941     if (es == NULL)
 942         return;
 943
 944     top = es->top;
 945
 946     /*
 947      * Flag error as cleared but remove it elsewhere to avoid two errors
 948      * accessing the same error stack location, revealing timing information.
 949      */
 950     clear = constant_time_select_int(constant_time_eq_int(clear, 0),
 951                                      0, ERR_FLAG_CLEAR);
 952     es->err_flags[top] |= clear;
 953 }