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_HMAC, 0, 0), "HMAC routines"},
  62     {ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines"},
  63     {ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC routines"},
  64     {ERR_PACK(ERR_LIB_KDF, 0, 0), "KDF routines"},
  65     {ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines"},
  66     {ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines"},
  67     {0, NULL},
  68 };
  69
  70 static ERR_STRING_DATA ERR_str_functs[] = {
  71     {ERR_PACK(0, SYS_F_FOPEN, 0), "fopen"},
  72     {ERR_PACK(0, SYS_F_CONNECT, 0), "connect"},
  73     {ERR_PACK(0, SYS_F_GETSERVBYNAME, 0), "getservbyname"},
  74     {ERR_PACK(0, SYS_F_SOCKET, 0), "socket"},
  75     {ERR_PACK(0, SYS_F_IOCTLSOCKET, 0), "ioctlsocket"},
  76     {ERR_PACK(0, SYS_F_BIND, 0), "bind"},
  77     {ERR_PACK(0, SYS_F_LISTEN, 0), "listen"},
  78     {ERR_PACK(0, SYS_F_ACCEPT, 0), "accept"},
  79 # ifdef OPENSSL_SYS_WINDOWS
  80     {ERR_PACK(0, SYS_F_WSASTARTUP, 0), "WSAstartup"},
  81 # endif
  82     {ERR_PACK(0, SYS_F_OPENDIR, 0), "opendir"},
  83     {ERR_PACK(0, SYS_F_FREAD, 0), "fread"},
  84     {ERR_PACK(0, SYS_F_GETADDRINFO, 0), "getaddrinfo"},
  85     {ERR_PACK(0, SYS_F_GETNAMEINFO, 0), "getnameinfo"},
  86     {ERR_PACK(0, SYS_F_SETSOCKOPT, 0), "setsockopt"},
  87     {ERR_PACK(0, SYS_F_GETSOCKOPT, 0), "getsockopt"},
  88     {ERR_PACK(0, SYS_F_GETSOCKNAME, 0), "getsockname"},
  89     {ERR_PACK(0, SYS_F_GETHOSTBYNAME, 0), "gethostbyname"},
  90     {ERR_PACK(0, SYS_F_FFLUSH, 0), "fflush"},
  91     {ERR_PACK(0, SYS_F_OPEN, 0), "open"},
  92     {ERR_PACK(0, SYS_F_CLOSE, 0), "close"},
  93     {ERR_PACK(0, SYS_F_IOCTL, 0), "ioctl"},
  94     {ERR_PACK(0, SYS_F_STAT, 0), "stat"},
  95     {ERR_PACK(0, SYS_F_FCNTL, 0), "fcntl"},
  96     {ERR_PACK(0, SYS_F_FSTAT, 0), "fstat"},
  97     {0, NULL},
  98 };
  99
 100 static ERR_STRING_DATA ERR_str_reasons[] = {
 101     {ERR_R_SYS_LIB, "system lib"},
 102     {ERR_R_BN_LIB, "BN lib"},
 103     {ERR_R_RSA_LIB, "RSA lib"},
 104     {ERR_R_DH_LIB, "DH lib"},
 105     {ERR_R_EVP_LIB, "EVP lib"},
 106     {ERR_R_BUF_LIB, "BUF lib"},
 107     {ERR_R_OBJ_LIB, "OBJ lib"},
 108     {ERR_R_PEM_LIB, "PEM lib"},
 109     {ERR_R_DSA_LIB, "DSA lib"},
 110     {ERR_R_X509_LIB, "X509 lib"},
 111     {ERR_R_ASN1_LIB, "ASN1 lib"},
 112     {ERR_R_EC_LIB, "EC lib"},
 113     {ERR_R_BIO_LIB, "BIO lib"},
 114     {ERR_R_PKCS7_LIB, "PKCS7 lib"},
 115     {ERR_R_X509V3_LIB, "X509V3 lib"},
 116     {ERR_R_ENGINE_LIB, "ENGINE lib"},
 117     {ERR_R_UI_LIB, "UI lib"},
 118     {ERR_R_OSSL_STORE_LIB, "STORE lib"},
 119     {ERR_R_ECDSA_LIB, "ECDSA lib"},
 120
 121     {ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
 122     {ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
 123
 124     {ERR_R_FATAL, "fatal"},
 125     {ERR_R_MALLOC_FAILURE, "malloc failure"},
 126     {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
 127      "called a function you should not call"},
 128     {ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
 129     {ERR_R_INTERNAL_ERROR, "internal error"},
 130     {ERR_R_DISABLED, "called a function that was disabled at compile-time"},
 131     {ERR_R_INIT_FAIL, "init fail"},
 132     {ERR_R_OPERATION_FAIL, "operation fail"},
 133
 134     {0, NULL},
 135 };
 136 #endif
 137
 138 static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
 139 static int set_err_thread_local;
 140 static CRYPTO_THREAD_LOCAL err_thread_local;
 141
 142 static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
 143 static CRYPTO_RWLOCK *err_string_lock;
 144
 145 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
 146
 147 /*
 148  * The internal state
 149  */
 150
 151 static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
 152 static int int_err_library_number = ERR_LIB_USER;
 153
 154 static unsigned long get_error_values(int inc, int top, const char **file,
 155                                       int *line, const char **data,
 156                                       int *flags);
 157
 158 static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
 159 {
 160     unsigned long ret, l;
 161
 162     l = a->error;
 163     ret = l ^ ERR_GET_LIB(l) ^ ERR_GET_FUNC(l);
 164     return (ret ^ ret % 19 * 13);
 165 }
 166
 167 static int err_string_data_cmp(const ERR_STRING_DATA *a,
 168                                const ERR_STRING_DATA *b)
 169 {
 170     if (a->error == b->error)
 171         return 0;
 172     return a->error > b->error ? 1 : -1;
 173 }
 174
 175 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
 176 {
 177     ERR_STRING_DATA *p = NULL;
 178
 179     CRYPTO_THREAD_read_lock(err_string_lock);
 180     p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
 181     CRYPTO_THREAD_unlock(err_string_lock);
 182
 183     return p;
 184 }
 185
 186 #ifndef OPENSSL_NO_ERR
 187 /* A measurement on Linux 2018-11-21 showed about 3.5kib */
 188 # define SPACE_SYS_STR_REASONS 4 * 1024
 189 # define NUM_SYS_STR_REASONS 127
 190
 191 static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
 192 /*
 193  * SYS_str_reasons is filled with copies of strerror() results at
 194  * initialization. 'errno' values up to 127 should cover all usual errors,
 195  * others will be displayed numerically by ERR_error_string. It is crucial
 196  * that we have something for each reason code that occurs in
 197  * ERR_str_reasons, or bogus reason strings will be returned for SYSerr(),
 198  * which always gets an errno value and never one of those 'standard' reason
 199  * codes.
 200  */
 201
 202 static void build_SYS_str_reasons(void)
 203 {
 204     /* OPENSSL_malloc cannot be used here, use static storage instead */
 205     static char strerror_pool[SPACE_SYS_STR_REASONS];
 206     char *cur = strerror_pool;
 207     size_t cnt = 0;
 208     static int init = 1;
 209     int i;
 210     int saveerrno = get_last_sys_error();
 211
 212     CRYPTO_THREAD_write_lock(err_string_lock);
 213     if (!init) {
 214         CRYPTO_THREAD_unlock(err_string_lock);
 215         return;
 216     }
 217
 218     for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
 219         ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
 220
 221         str->error = ERR_PACK(ERR_LIB_SYS, 0, i);
 222         if (str->string == NULL) {
 223             if (openssl_strerror_r(i, cur, sizeof(strerror_pool) - cnt)) {
 224                 size_t l = strlen(cur);
 225
 226                 str->string = cur;
 227                 cnt += l;
 228                 if (cnt > sizeof(strerror_pool))
 229                     cnt = sizeof(strerror_pool);
 230                 cur += l;
 231
 232                 /*
 233                  * VMS has an unusual quirk of adding spaces at the end of
 234                  * some (most? all?) messages.  Lets trim them off.
 235                  */
 236                 while (ossl_isspace(cur[-1])) {
 237                     cur--;
 238                     cnt--;
 239                 }
 240                 *cur++ = '\0';
 241                 cnt++;
 242             }
 243         }
 244         if (str->string == NULL)
 245             str->string = "unknown";
 246     }
 247
 248     /*
 249      * Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL}, as
 250      * required by ERR_load_strings.
 251      */
 252
 253     init = 0;
 254
 255     CRYPTO_THREAD_unlock(err_string_lock);
 256     /* openssl_strerror_r could change errno, but we want to preserve it */
 257     set_sys_error(saveerrno);
 258     err_load_strings(SYS_str_reasons);
 259 }
 260 #endif
 261
 262 #define err_clear_data(p, i) \
 263         do { \
 264             if ((p)->err_data_flags[i] & ERR_TXT_MALLOCED) {\
 265                 OPENSSL_free((p)->err_data[i]); \
 266                 (p)->err_data[i] = NULL; \
 267             } \
 268             (p)->err_data_flags[i] = 0; \
 269         } while (0)
 270
 271 #define err_clear(p, i) \
 272         do { \
 273             err_clear_data(p, i); \
 274             (p)->err_flags[i] = 0; \
 275             (p)->err_buffer[i] = 0; \
 276             (p)->err_file[i] = NULL; \
 277             (p)->err_line[i] = -1; \
 278         } while (0)
 279
 280 static void ERR_STATE_free(ERR_STATE *s)
 281 {
 282     int i;
 283
 284     if (s == NULL)
 285         return;
 286     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 287         err_clear_data(s, i);
 288     }
 289     OPENSSL_free(s);
 290 }
 291
 292 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
 293 {
 294     if (!OPENSSL_init_crypto(0, NULL))
 295         return 0;
 296     err_string_lock = CRYPTO_THREAD_lock_new();
 297     if (err_string_lock == NULL)
 298         return 0;
 299     int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
 300                                             err_string_data_cmp);
 301     if (int_error_hash == NULL) {
 302         CRYPTO_THREAD_lock_free(err_string_lock);
 303         err_string_lock = NULL;
 304         return 0;
 305     }
 306     return 1;
 307 }
 308
 309 void err_cleanup(void)
 310 {
 311     if (set_err_thread_local != 0)
 312         CRYPTO_THREAD_cleanup_local(&err_thread_local);
 313     CRYPTO_THREAD_lock_free(err_string_lock);
 314     err_string_lock = NULL;
 315     lh_ERR_STRING_DATA_free(int_error_hash);
 316     int_error_hash = NULL;
 317 }
 318
 319 /*
 320  * Legacy; pack in the library.
 321  */
 322 static void err_patch(int lib, ERR_STRING_DATA *str)
 323 {
 324     unsigned long plib = ERR_PACK(lib, 0, 0);
 325
 326     for (; str->error != 0; str++)
 327         str->error |= plib;
 328 }
 329
 330 /*
 331  * Hash in |str| error strings. Assumes the URN_ONCE was done.
 332  */
 333 static int err_load_strings(const ERR_STRING_DATA *str)
 334 {
 335     CRYPTO_THREAD_write_lock(err_string_lock);
 336     for (; str->error; str++)
 337         (void)lh_ERR_STRING_DATA_insert(int_error_hash,
 338                                        (ERR_STRING_DATA *)str);
 339     CRYPTO_THREAD_unlock(err_string_lock);
 340     return 1;
 341 }
 342
 343 int ERR_load_ERR_strings(void)
 344 {
 345 #ifndef OPENSSL_NO_ERR
 346     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 347         return 0;
 348
 349     err_load_strings(ERR_str_libraries);
 350     err_load_strings(ERR_str_reasons);
 351     err_patch(ERR_LIB_SYS, ERR_str_functs);
 352     err_load_strings(ERR_str_functs);
 353     build_SYS_str_reasons();
 354 #endif
 355     return 1;
 356 }
 357
 358 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
 359 {
 360     if (ERR_load_ERR_strings() == 0)
 361         return 0;
 362
 363     err_patch(lib, str);
 364     err_load_strings(str);
 365     return 1;
 366 }
 367
 368 int ERR_load_strings_const(const ERR_STRING_DATA *str)
 369 {
 370     if (ERR_load_ERR_strings() == 0)
 371         return 0;
 372     err_load_strings(str);
 373     return 1;
 374 }
 375
 376 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
 377 {
 378     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 379         return 0;
 380
 381     CRYPTO_THREAD_write_lock(err_string_lock);
 382     /*
 383      * We don't need to ERR_PACK the lib, since that was done (to
 384      * the table) when it was loaded.
 385      */
 386     for (; str->error; str++)
 387         (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
 388     CRYPTO_THREAD_unlock(err_string_lock);
 389
 390     return 1;
 391 }
 392
 393 void err_free_strings_int(void)
 394 {
 395     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 396         return;
 397 }
 398
 399 /********************************************************/
 400
 401 void ERR_put_error(int lib, int func, int reason, const char *file, int line)
 402 {
 403     ERR_STATE *es;
 404
 405 #ifdef _OSD_POSIX
 406     /*
 407      * In the BS2000-OSD POSIX subsystem, the compiler generates path names
 408      * in the form "*POSIX(/etc/passwd)". This dirty hack strips them to
 409      * something sensible. @@@ We shouldn't modify a const string, though.
 410      */
 411     if (strncmp(file, "*POSIX(", sizeof("*POSIX(") - 1) == 0) {
 412         char *end;
 413
 414         /* Skip the "*POSIX(" prefix */
 415         file += sizeof("*POSIX(") - 1;
 416         end = &file[strlen(file) - 1];
 417         if (*end == ')')
 418             *end = '\0';
 419         /* Optional: use the basename of the path only. */
 420         if ((end = strrchr(file, '/')) != NULL)
 421             file = &end[1];
 422     }
 423 #endif
 424     es = ERR_get_state();
 425     if (es == NULL)
 426         return;
 427
 428     es->top = (es->top + 1) % ERR_NUM_ERRORS;
 429     if (es->top == es->bottom)
 430         es->bottom = (es->bottom + 1) % ERR_NUM_ERRORS;
 431     es->err_flags[es->top] = 0;
 432     es->err_buffer[es->top] = ERR_PACK(lib, func, reason);
 433     es->err_file[es->top] = file;
 434     es->err_line[es->top] = line;
 435     err_clear_data(es, es->top);
 436 }
 437
 438 void ERR_clear_error(void)
 439 {
 440     int i;
 441     ERR_STATE *es;
 442
 443     es = ERR_get_state();
 444     if (es == NULL)
 445         return;
 446
 447     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 448         err_clear(es, i);
 449     }
 450     es->top = es->bottom = 0;
 451 }
 452
 453 unsigned long ERR_get_error(void)
 454 {
 455     return get_error_values(1, 0, NULL, NULL, NULL, NULL);
 456 }
 457
 458 unsigned long ERR_get_error_line(const char **file, int *line)
 459 {
 460     return get_error_values(1, 0, file, line, NULL, NULL);
 461 }
 462
 463 unsigned long ERR_get_error_line_data(const char **file, int *line,
 464                                       const char **data, int *flags)
 465 {
 466     return get_error_values(1, 0, file, line, data, flags);
 467 }
 468
 469 unsigned long ERR_peek_error(void)
 470 {
 471     return get_error_values(0, 0, NULL, NULL, NULL, NULL);
 472 }
 473
 474 unsigned long ERR_peek_error_line(const char **file, int *line)
 475 {
 476     return get_error_values(0, 0, file, line, NULL, NULL);
 477 }
 478
 479 unsigned long ERR_peek_error_line_data(const char **file, int *line,
 480                                        const char **data, int *flags)
 481 {
 482     return get_error_values(0, 0, file, line, data, flags);
 483 }
 484
 485 unsigned long ERR_peek_last_error(void)
 486 {
 487     return get_error_values(0, 1, NULL, NULL, NULL, NULL);
 488 }
 489
 490 unsigned long ERR_peek_last_error_line(const char **file, int *line)
 491 {
 492     return get_error_values(0, 1, file, line, NULL, NULL);
 493 }
 494
 495 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
 496                                             const char **data, int *flags)
 497 {
 498     return get_error_values(0, 1, file, line, data, flags);
 499 }
 500
 501 static unsigned long get_error_values(int inc, int top, const char **file,
 502                                       int *line, const char **data,
 503                                       int *flags)
 504 {
 505     int i = 0;
 506     ERR_STATE *es;
 507     unsigned long ret;
 508
 509     es = ERR_get_state();
 510     if (es == NULL)
 511         return 0;
 512
 513     if (inc && top) {
 514         if (file)
 515             *file = "";
 516         if (line)
 517             *line = 0;
 518         if (data)
 519             *data = "";
 520         if (flags)
 521             *flags = 0;
 522
 523         return ERR_R_INTERNAL_ERROR;
 524     }
 525
 526     if (es->bottom == es->top)
 527         return 0;
 528     if (top)
 529         i = es->top;            /* last error */
 530     else
 531         i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */
 532
 533     ret = es->err_buffer[i];
 534     if (inc) {
 535         es->bottom = i;
 536         es->err_buffer[i] = 0;
 537     }
 538
 539     if (file != NULL && line != NULL) {
 540         if (es->err_file[i] == NULL) {
 541             *file = "NA";
 542             *line = 0;
 543         } else {
 544             *file = es->err_file[i];
 545             *line = es->err_line[i];
 546         }
 547     }
 548
 549     if (data == NULL) {
 550         if (inc) {
 551             err_clear_data(es, i);
 552         }
 553     } else {
 554         if (es->err_data[i] == NULL) {
 555             *data = "";
 556             if (flags != NULL)
 557                 *flags = 0;
 558         } else {
 559             *data = es->err_data[i];
 560             if (flags != NULL)
 561                 *flags = es->err_data_flags[i];
 562         }
 563     }
 564     return ret;
 565 }
 566
 567 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
 568 {
 569     char lsbuf[64], fsbuf[64], rsbuf[64];
 570     const char *ls, *fs, *rs;
 571     unsigned long l, f, r;
 572
 573     if (len == 0)
 574         return;
 575
 576     l = ERR_GET_LIB(e);
 577     ls = ERR_lib_error_string(e);
 578     if (ls == NULL) {
 579         BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
 580         ls = lsbuf;
 581     }
 582
 583     fs = ERR_func_error_string(e);
 584     f = ERR_GET_FUNC(e);
 585     if (fs == NULL) {
 586         BIO_snprintf(fsbuf, sizeof(fsbuf), "func(%lu)", f);
 587         fs = fsbuf;
 588     }
 589
 590     rs = ERR_reason_error_string(e);
 591     r = ERR_GET_REASON(e);
 592     if (rs == NULL) {
 593         BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
 594         rs = rsbuf;
 595     }
 596
 597     BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, fs, rs);
 598     if (strlen(buf) == len - 1) {
 599         /* Didn't fit; use a minimal format. */
 600         BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, f, r);
 601     }
 602 }
 603
 604 /*
 605  * ERR_error_string_n should be used instead for ret != NULL as
 606  * ERR_error_string cannot know how large the buffer is
 607  */
 608 char *ERR_error_string(unsigned long e, char *ret)
 609 {
 610     static char buf[256];
 611
 612     if (ret == NULL)
 613         ret = buf;
 614     ERR_error_string_n(e, ret, (int)sizeof(buf));
 615     return ret;
 616 }
 617
 618 const char *ERR_lib_error_string(unsigned long e)
 619 {
 620     ERR_STRING_DATA d, *p;
 621     unsigned long l;
 622
 623     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 624         return NULL;
 625     }
 626
 627     l = ERR_GET_LIB(e);
 628     d.error = ERR_PACK(l, 0, 0);
 629     p = int_err_get_item(&d);
 630     return ((p == NULL) ? NULL : p->string);
 631 }
 632
 633 const char *ERR_func_error_string(unsigned long e)
 634 {
 635     ERR_STRING_DATA d, *p;
 636     unsigned long l, f;
 637
 638     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 639         return NULL;
 640     }
 641
 642     l = ERR_GET_LIB(e);
 643     f = ERR_GET_FUNC(e);
 644     d.error = ERR_PACK(l, f, 0);
 645     p = int_err_get_item(&d);
 646     return ((p == NULL) ? NULL : p->string);
 647 }
 648
 649 const char *ERR_reason_error_string(unsigned long e)
 650 {
 651     ERR_STRING_DATA d, *p = NULL;
 652     unsigned long l, r;
 653
 654     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 655         return NULL;
 656     }
 657
 658     l = ERR_GET_LIB(e);
 659     r = ERR_GET_REASON(e);
 660     d.error = ERR_PACK(l, 0, r);
 661     p = int_err_get_item(&d);
 662     if (!p) {
 663         d.error = ERR_PACK(0, 0, r);
 664         p = int_err_get_item(&d);
 665     }
 666     return ((p == NULL) ? NULL : p->string);
 667 }
 668
 669 void err_delete_thread_state(void)
 670 {
 671     ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
 672     if (state == NULL)
 673         return;
 674
 675     CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 676     ERR_STATE_free(state);
 677 }
 678
 679 #if !OPENSSL_API_1_1_0
 680 void ERR_remove_thread_state(void *dummy)
 681 {
 682 }
 683 #endif
 684
 685 #if !OPENSSL_API_1_0_0
 686 void ERR_remove_state(unsigned long pid)
 687 {
 688 }
 689 #endif
 690
 691 DEFINE_RUN_ONCE_STATIC(err_do_init)
 692 {
 693     set_err_thread_local = 1;
 694     return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
 695 }
 696
 697 ERR_STATE *ERR_get_state(void)
 698 {
 699     ERR_STATE *state;
 700     int saveerrno = get_last_sys_error();
 701
 702     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 703         return NULL;
 704
 705     if (!RUN_ONCE(&err_init, err_do_init))
 706         return NULL;
 707
 708     state = CRYPTO_THREAD_get_local(&err_thread_local);
 709     if (state == (ERR_STATE*)-1)
 710         return NULL;
 711
 712     if (state == NULL) {
 713         if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 714             return NULL;
 715
 716         if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
 717             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 718             return NULL;
 719         }
 720
 721         if (!ossl_init_thread_start(OPENSSL_INIT_THREAD_ERR_STATE)
 722                 || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
 723             ERR_STATE_free(state);
 724             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 725             return NULL;
 726         }
 727
 728         /* Ignore failures from these */
 729         OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 730     }
 731
 732     set_sys_error(saveerrno);
 733     return state;
 734 }
 735
 736 /*
 737  * err_shelve_state returns the current thread local error state
 738  * and freezes the error module until err_unshelve_state is called.
 739  */
 740 int err_shelve_state(void **state)
 741 {
 742     int saveerrno = get_last_sys_error();
 743
 744     /*
 745      * Note, at present our only caller is OPENSSL_init_crypto(), indirectly
 746      * via ossl_init_load_crypto_nodelete(), by which point the requested
 747      * "base" initialization has already been performed, so the below call is a
 748      * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
 749      *
 750      * If are no other valid callers of this function, the call below can be
 751      * removed, avoiding the re-entry into OPENSSL_init_crypto().  If there are
 752      * potential uses that are not from inside OPENSSL_init_crypto(), then this
 753      * call is needed, but some care is required to make sure that the re-entry
 754      * remains a NOOP.
 755      */
 756     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 757         return 0;
 758
 759     if (!RUN_ONCE(&err_init, err_do_init))
 760         return 0;
 761
 762     *state = CRYPTO_THREAD_get_local(&err_thread_local);
 763     if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 764         return 0;
 765
 766     set_sys_error(saveerrno);
 767     return 1;
 768 }
 769
 770 /*
 771  * err_unshelve_state restores the error state that was returned
 772  * by err_shelve_state previously.
 773  */
 774 void err_unshelve_state(void* state)
 775 {
 776     if (state != (void*)-1)
 777         CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
 778 }
 779
 780 int ERR_get_next_error_library(void)
 781 {
 782     int ret;
 783
 784     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 785         return 0;
 786
 787     CRYPTO_THREAD_write_lock(err_string_lock);
 788     ret = int_err_library_number++;
 789     CRYPTO_THREAD_unlock(err_string_lock);
 790     return ret;
 791 }
 792
 793 void ERR_set_error_data(char *data, int flags)
 794 {
 795     ERR_STATE *es;
 796     int i;
 797
 798     es = ERR_get_state();
 799     if (es == NULL)
 800         return;
 801
 802     i = es->top;
 803
 804     err_clear_data(es, i);
 805     es->err_data[i] = data;
 806     es->err_data_flags[i] = flags;
 807 }
 808
 809 void ERR_add_error_data(int num, ...)
 810 {
 811     va_list args;
 812     va_start(args, num);
 813     ERR_add_error_vdata(num, args);
 814     va_end(args);
 815 }
 816
 817 void ERR_add_error_vdata(int num, va_list args)
 818 {
 819     int i, n, s;
 820     char *str, *p, *a;
 821
 822     s = 80;
 823     if ((str = OPENSSL_malloc(s + 1)) == NULL) {
 824         /* ERRerr(ERR_F_ERR_ADD_ERROR_VDATA, ERR_R_MALLOC_FAILURE); */
 825         return;
 826     }
 827     str[0] = '\0';
 828
 829     n = 0;
 830     for (i = 0; i < num; i++) {
 831         a = va_arg(args, char *);
 832         if (a == NULL)
 833             a = "<NULL>";
 834         n += strlen(a);
 835         if (n > s) {
 836             s = n + 20;
 837             p = OPENSSL_realloc(str, s + 1);
 838             if (p == NULL) {
 839                 OPENSSL_free(str);
 840                 return;
 841             }
 842             str = p;
 843         }
 844         OPENSSL_strlcat(str, a, (size_t)s + 1);
 845     }
 846     ERR_set_error_data(str, ERR_TXT_MALLOCED | ERR_TXT_STRING);
 847 }
 848
 849 int ERR_set_mark(void)
 850 {
 851     ERR_STATE *es;
 852
 853     es = ERR_get_state();
 854     if (es == NULL)
 855         return 0;
 856
 857     if (es->bottom == es->top)
 858         return 0;
 859     es->err_flags[es->top] |= ERR_FLAG_MARK;
 860     return 1;
 861 }
 862
 863 int ERR_pop_to_mark(void)
 864 {
 865     ERR_STATE *es;
 866
 867     es = ERR_get_state();
 868     if (es == NULL)
 869         return 0;
 870
 871     while (es->bottom != es->top
 872            && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
 873         err_clear(es, es->top);
 874         es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
 875     }
 876
 877     if (es->bottom == es->top)
 878         return 0;
 879     es->err_flags[es->top] &= ~ERR_FLAG_MARK;
 880     return 1;
 881 }
 882
 883 int ERR_clear_last_mark(void)
 884 {
 885     ERR_STATE *es;
 886     int top;
 887
 888     es = ERR_get_state();
 889     if (es == NULL)
 890         return 0;
 891
 892     top = es->top;
 893     while (es->bottom != top
 894            && (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
 895         top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
 896     }
 897
 898     if (es->bottom == top)
 899         return 0;
 900     es->err_flags[top] &= ~ERR_FLAG_MARK;
 901     return 1;
 902 }
 903
 904 #ifdef UINTPTR_T
 905 # undef UINTPTR_T
 906 #endif
 907 /*
 908  * uintptr_t is the answer, but unfortunately C89, current "least common
 909  * denominator" doesn't define it. Most legacy platforms typedef it anyway,
 910  * so that attempt to fill the gaps means that one would have to identify
 911  * that track these gaps, which would be undesirable. Macro it is...
 912  */
 913 #if defined(__VMS) && __INITIAL_POINTER_SIZE==64
 914 /*
 915  * But we can't use size_t on VMS, because it adheres to sizeof(size_t)==4
 916  * even in 64-bit builds, which means that it won't work as mask.
 917  */
 918 # define UINTPTR_T unsigned long long
 919 #else
 920 # define UINTPTR_T size_t
 921 #endif
 922
 923 void err_clear_last_constant_time(int clear)
 924 {
 925     ERR_STATE *es;
 926     int top;
 927
 928     es = ERR_get_state();
 929     if (es == NULL)
 930         return;
 931
 932     top = es->top;
 933
 934     es->err_flags[top] &= ~(0 - clear);
 935     es->err_buffer[top] &= ~(0UL - clear);
 936     es->err_file[top] = (const char *)((UINTPTR_T)es->err_file[top] &
 937                                        ~((UINTPTR_T)0 - clear));
 938     es->err_line[top] |= 0 - clear;
 939
 940     es->top = (top + ERR_NUM_ERRORS - clear) % ERR_NUM_ERRORS;
 941 }