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     {0, NULL},
  70 };
  71
  72 static ERR_STRING_DATA ERR_str_functs[] = {
  73     {ERR_PACK(0, SYS_F_FOPEN, 0), "fopen"},
  74     {ERR_PACK(0, SYS_F_CONNECT, 0), "connect"},
  75     {ERR_PACK(0, SYS_F_GETSERVBYNAME, 0), "getservbyname"},
  76     {ERR_PACK(0, SYS_F_SOCKET, 0), "socket"},
  77     {ERR_PACK(0, SYS_F_IOCTLSOCKET, 0), "ioctlsocket"},
  78     {ERR_PACK(0, SYS_F_BIND, 0), "bind"},
  79     {ERR_PACK(0, SYS_F_LISTEN, 0), "listen"},
  80     {ERR_PACK(0, SYS_F_ACCEPT, 0), "accept"},
  81 # ifdef OPENSSL_SYS_WINDOWS
  82     {ERR_PACK(0, SYS_F_WSASTARTUP, 0), "WSAstartup"},
  83 # endif
  84     {ERR_PACK(0, SYS_F_OPENDIR, 0), "opendir"},
  85     {ERR_PACK(0, SYS_F_FREAD, 0), "fread"},
  86     {ERR_PACK(0, SYS_F_GETADDRINFO, 0), "getaddrinfo"},
  87     {ERR_PACK(0, SYS_F_GETNAMEINFO, 0), "getnameinfo"},
  88     {ERR_PACK(0, SYS_F_SETSOCKOPT, 0), "setsockopt"},
  89     {ERR_PACK(0, SYS_F_GETSOCKOPT, 0), "getsockopt"},
  90     {ERR_PACK(0, SYS_F_GETSOCKNAME, 0), "getsockname"},
  91     {ERR_PACK(0, SYS_F_GETHOSTBYNAME, 0), "gethostbyname"},
  92     {ERR_PACK(0, SYS_F_FFLUSH, 0), "fflush"},
  93     {ERR_PACK(0, SYS_F_OPEN, 0), "open"},
  94     {ERR_PACK(0, SYS_F_CLOSE, 0), "close"},
  95     {ERR_PACK(0, SYS_F_IOCTL, 0), "ioctl"},
  96     {ERR_PACK(0, SYS_F_STAT, 0), "stat"},
  97     {ERR_PACK(0, SYS_F_FCNTL, 0), "fcntl"},
  98     {ERR_PACK(0, SYS_F_FSTAT, 0), "fstat"},
  99     {0, NULL},
 100 };
 101
 102 static ERR_STRING_DATA ERR_str_reasons[] = {
 103     {ERR_R_SYS_LIB, "system lib"},
 104     {ERR_R_BN_LIB, "BN lib"},
 105     {ERR_R_RSA_LIB, "RSA lib"},
 106     {ERR_R_DH_LIB, "DH lib"},
 107     {ERR_R_EVP_LIB, "EVP lib"},
 108     {ERR_R_BUF_LIB, "BUF lib"},
 109     {ERR_R_OBJ_LIB, "OBJ lib"},
 110     {ERR_R_PEM_LIB, "PEM lib"},
 111     {ERR_R_DSA_LIB, "DSA lib"},
 112     {ERR_R_X509_LIB, "X509 lib"},
 113     {ERR_R_ASN1_LIB, "ASN1 lib"},
 114     {ERR_R_EC_LIB, "EC lib"},
 115     {ERR_R_BIO_LIB, "BIO lib"},
 116     {ERR_R_PKCS7_LIB, "PKCS7 lib"},
 117     {ERR_R_X509V3_LIB, "X509V3 lib"},
 118     {ERR_R_ENGINE_LIB, "ENGINE lib"},
 119     {ERR_R_UI_LIB, "UI lib"},
 120     {ERR_R_OSSL_STORE_LIB, "STORE lib"},
 121     {ERR_R_ECDSA_LIB, "ECDSA lib"},
 122
 123     {ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
 124     {ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
 125
 126     {ERR_R_FATAL, "fatal"},
 127     {ERR_R_MALLOC_FAILURE, "malloc failure"},
 128     {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
 129      "called a function you should not call"},
 130     {ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
 131     {ERR_R_INTERNAL_ERROR, "internal error"},
 132     {ERR_R_DISABLED, "called a function that was disabled at compile-time"},
 133     {ERR_R_INIT_FAIL, "init fail"},
 134     {ERR_R_OPERATION_FAIL, "operation fail"},
 135
 136     {0, NULL},
 137 };
 138 #endif
 139
 140 static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
 141 static int set_err_thread_local;
 142 static CRYPTO_THREAD_LOCAL err_thread_local;
 143
 144 static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
 145 static CRYPTO_RWLOCK *err_string_lock;
 146
 147 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
 148
 149 /*
 150  * The internal state
 151  */
 152
 153 static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
 154 static int int_err_library_number = ERR_LIB_USER;
 155
 156 static unsigned long get_error_values(int inc, int top, const char **file,
 157                                       int *line, const char **data,
 158                                       int *flags);
 159
 160 static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
 161 {
 162     unsigned long ret, l;
 163
 164     l = a->error;
 165     ret = l ^ ERR_GET_LIB(l) ^ ERR_GET_FUNC(l);
 166     return (ret ^ ret % 19 * 13);
 167 }
 168
 169 static int err_string_data_cmp(const ERR_STRING_DATA *a,
 170                                const ERR_STRING_DATA *b)
 171 {
 172     if (a->error == b->error)
 173         return 0;
 174     return a->error > b->error ? 1 : -1;
 175 }
 176
 177 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
 178 {
 179     ERR_STRING_DATA *p = NULL;
 180
 181     CRYPTO_THREAD_read_lock(err_string_lock);
 182     p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
 183     CRYPTO_THREAD_unlock(err_string_lock);
 184
 185     return p;
 186 }
 187
 188 #ifndef OPENSSL_NO_ERR
 189 /* A measurement on Linux 2018-11-21 showed about 3.5kib */
 190 # define SPACE_SYS_STR_REASONS 4 * 1024
 191 # define NUM_SYS_STR_REASONS 127
 192
 193 static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
 194 /*
 195  * SYS_str_reasons is filled with copies of strerror() results at
 196  * initialization. 'errno' values up to 127 should cover all usual errors,
 197  * others will be displayed numerically by ERR_error_string. It is crucial
 198  * that we have something for each reason code that occurs in
 199  * ERR_str_reasons, or bogus reason strings will be returned for SYSerr(),
 200  * which always gets an errno value and never one of those 'standard' reason
 201  * codes.
 202  */
 203
 204 static void build_SYS_str_reasons(void)
 205 {
 206     /* OPENSSL_malloc cannot be used here, use static storage instead */
 207     static char strerror_pool[SPACE_SYS_STR_REASONS];
 208     char *cur = strerror_pool;
 209     size_t cnt = 0;
 210     static int init = 1;
 211     int i;
 212     int saveerrno = get_last_sys_error();
 213
 214     CRYPTO_THREAD_write_lock(err_string_lock);
 215     if (!init) {
 216         CRYPTO_THREAD_unlock(err_string_lock);
 217         return;
 218     }
 219
 220     for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
 221         ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
 222
 223         str->error = ERR_PACK(ERR_LIB_SYS, 0, i);
 224         if (str->string == NULL) {
 225             if (openssl_strerror_r(i, cur, sizeof(strerror_pool) - cnt)) {
 226                 size_t l = strlen(cur);
 227
 228                 str->string = cur;
 229                 cnt += l;
 230                 if (cnt > sizeof(strerror_pool))
 231                     cnt = sizeof(strerror_pool);
 232                 cur += l;
 233
 234                 /*
 235                  * VMS has an unusual quirk of adding spaces at the end of
 236                  * some (most? all?) messages.  Lets trim them off.
 237                  */
 238                 while (ossl_isspace(cur[-1])) {
 239                     cur--;
 240                     cnt--;
 241                 }
 242                 *cur++ = '\0';
 243                 cnt++;
 244             }
 245         }
 246         if (str->string == NULL)
 247             str->string = "unknown";
 248     }
 249
 250     /*
 251      * Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL}, as
 252      * required by ERR_load_strings.
 253      */
 254
 255     init = 0;
 256
 257     CRYPTO_THREAD_unlock(err_string_lock);
 258     /* openssl_strerror_r could change errno, but we want to preserve it */
 259     set_sys_error(saveerrno);
 260     err_load_strings(SYS_str_reasons);
 261 }
 262 #endif
 263
 264 #define err_clear_data(p, i) \
 265         do { \
 266             if ((p)->err_data_flags[i] & ERR_TXT_MALLOCED) {\
 267                 OPENSSL_free((p)->err_data[i]); \
 268                 (p)->err_data[i] = NULL; \
 269             } \
 270             (p)->err_data_flags[i] = 0; \
 271         } while (0)
 272
 273 #define err_clear(p, i) \
 274         do { \
 275             err_clear_data(p, i); \
 276             (p)->err_flags[i] = 0; \
 277             (p)->err_buffer[i] = 0; \
 278             (p)->err_file[i] = NULL; \
 279             (p)->err_line[i] = -1; \
 280         } while (0)
 281
 282 static void ERR_STATE_free(ERR_STATE *s)
 283 {
 284     int i;
 285
 286     if (s == NULL)
 287         return;
 288     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 289         err_clear_data(s, i);
 290     }
 291     OPENSSL_free(s);
 292 }
 293
 294 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
 295 {
 296     if (!OPENSSL_init_crypto(0, NULL))
 297         return 0;
 298     err_string_lock = CRYPTO_THREAD_lock_new();
 299     if (err_string_lock == NULL)
 300         return 0;
 301     int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
 302                                             err_string_data_cmp);
 303     if (int_error_hash == NULL) {
 304         CRYPTO_THREAD_lock_free(err_string_lock);
 305         err_string_lock = NULL;
 306         return 0;
 307     }
 308     return 1;
 309 }
 310
 311 void err_cleanup(void)
 312 {
 313     if (set_err_thread_local != 0)
 314         CRYPTO_THREAD_cleanup_local(&err_thread_local);
 315     CRYPTO_THREAD_lock_free(err_string_lock);
 316     err_string_lock = NULL;
 317     lh_ERR_STRING_DATA_free(int_error_hash);
 318     int_error_hash = NULL;
 319 }
 320
 321 /*
 322  * Legacy; pack in the library.
 323  */
 324 static void err_patch(int lib, ERR_STRING_DATA *str)
 325 {
 326     unsigned long plib = ERR_PACK(lib, 0, 0);
 327
 328     for (; str->error != 0; str++)
 329         str->error |= plib;
 330 }
 331
 332 /*
 333  * Hash in |str| error strings. Assumes the URN_ONCE was done.
 334  */
 335 static int err_load_strings(const ERR_STRING_DATA *str)
 336 {
 337     CRYPTO_THREAD_write_lock(err_string_lock);
 338     for (; str->error; str++)
 339         (void)lh_ERR_STRING_DATA_insert(int_error_hash,
 340                                        (ERR_STRING_DATA *)str);
 341     CRYPTO_THREAD_unlock(err_string_lock);
 342     return 1;
 343 }
 344
 345 int ERR_load_ERR_strings(void)
 346 {
 347 #ifndef OPENSSL_NO_ERR
 348     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 349         return 0;
 350
 351     err_load_strings(ERR_str_libraries);
 352     err_load_strings(ERR_str_reasons);
 353     err_patch(ERR_LIB_SYS, ERR_str_functs);
 354     err_load_strings(ERR_str_functs);
 355     build_SYS_str_reasons();
 356 #endif
 357     return 1;
 358 }
 359
 360 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
 361 {
 362     if (ERR_load_ERR_strings() == 0)
 363         return 0;
 364
 365     err_patch(lib, str);
 366     err_load_strings(str);
 367     return 1;
 368 }
 369
 370 int ERR_load_strings_const(const ERR_STRING_DATA *str)
 371 {
 372     if (ERR_load_ERR_strings() == 0)
 373         return 0;
 374     err_load_strings(str);
 375     return 1;
 376 }
 377
 378 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
 379 {
 380     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 381         return 0;
 382
 383     CRYPTO_THREAD_write_lock(err_string_lock);
 384     /*
 385      * We don't need to ERR_PACK the lib, since that was done (to
 386      * the table) when it was loaded.
 387      */
 388     for (; str->error; str++)
 389         (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
 390     CRYPTO_THREAD_unlock(err_string_lock);
 391
 392     return 1;
 393 }
 394
 395 void err_free_strings_int(void)
 396 {
 397     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 398         return;
 399 }
 400
 401 /********************************************************/
 402
 403 void ERR_put_error(int lib, int func, int reason, const char *file, int line)
 404 {
 405     ERR_STATE *es;
 406
 407 #ifdef _OSD_POSIX
 408     /*
 409      * In the BS2000-OSD POSIX subsystem, the compiler generates path names
 410      * in the form "*POSIX(/etc/passwd)". This dirty hack strips them to
 411      * something sensible. @@@ We shouldn't modify a const string, though.
 412      */
 413     if (strncmp(file, "*POSIX(", sizeof("*POSIX(") - 1) == 0) {
 414         char *end;
 415
 416         /* Skip the "*POSIX(" prefix */
 417         file += sizeof("*POSIX(") - 1;
 418         end = &file[strlen(file) - 1];
 419         if (*end == ')')
 420             *end = '\0';
 421         /* Optional: use the basename of the path only. */
 422         if ((end = strrchr(file, '/')) != NULL)
 423             file = &end[1];
 424     }
 425 #endif
 426     es = ERR_get_state();
 427     if (es == NULL)
 428         return;
 429
 430     es->top = (es->top + 1) % ERR_NUM_ERRORS;
 431     if (es->top == es->bottom)
 432         es->bottom = (es->bottom + 1) % ERR_NUM_ERRORS;
 433     es->err_flags[es->top] = 0;
 434     es->err_buffer[es->top] = ERR_PACK(lib, func, reason);
 435     es->err_file[es->top] = file;
 436     es->err_line[es->top] = line;
 437     err_clear_data(es, es->top);
 438 }
 439
 440 void ERR_clear_error(void)
 441 {
 442     int i;
 443     ERR_STATE *es;
 444
 445     es = ERR_get_state();
 446     if (es == NULL)
 447         return;
 448
 449     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 450         err_clear(es, i);
 451     }
 452     es->top = es->bottom = 0;
 453 }
 454
 455 unsigned long ERR_get_error(void)
 456 {
 457     return get_error_values(1, 0, NULL, NULL, NULL, NULL);
 458 }
 459
 460 unsigned long ERR_get_error_line(const char **file, int *line)
 461 {
 462     return get_error_values(1, 0, file, line, NULL, NULL);
 463 }
 464
 465 unsigned long ERR_get_error_line_data(const char **file, int *line,
 466                                       const char **data, int *flags)
 467 {
 468     return get_error_values(1, 0, file, line, data, flags);
 469 }
 470
 471 unsigned long ERR_peek_error(void)
 472 {
 473     return get_error_values(0, 0, NULL, NULL, NULL, NULL);
 474 }
 475
 476 unsigned long ERR_peek_error_line(const char **file, int *line)
 477 {
 478     return get_error_values(0, 0, file, line, NULL, NULL);
 479 }
 480
 481 unsigned long ERR_peek_error_line_data(const char **file, int *line,
 482                                        const char **data, int *flags)
 483 {
 484     return get_error_values(0, 0, file, line, data, flags);
 485 }
 486
 487 unsigned long ERR_peek_last_error(void)
 488 {
 489     return get_error_values(0, 1, NULL, NULL, NULL, NULL);
 490 }
 491
 492 unsigned long ERR_peek_last_error_line(const char **file, int *line)
 493 {
 494     return get_error_values(0, 1, file, line, NULL, NULL);
 495 }
 496
 497 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
 498                                             const char **data, int *flags)
 499 {
 500     return get_error_values(0, 1, file, line, data, flags);
 501 }
 502
 503 static unsigned long get_error_values(int inc, int top, const char **file,
 504                                       int *line, const char **data,
 505                                       int *flags)
 506 {
 507     int i = 0;
 508     ERR_STATE *es;
 509     unsigned long ret;
 510
 511     es = ERR_get_state();
 512     if (es == NULL)
 513         return 0;
 514
 515     if (inc && top) {
 516         if (file)
 517             *file = "";
 518         if (line)
 519             *line = 0;
 520         if (data)
 521             *data = "";
 522         if (flags)
 523             *flags = 0;
 524
 525         return ERR_R_INTERNAL_ERROR;
 526     }
 527
 528     if (es->bottom == es->top)
 529         return 0;
 530     if (top)
 531         i = es->top;            /* last error */
 532     else
 533         i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */
 534
 535     ret = es->err_buffer[i];
 536     if (inc) {
 537         es->bottom = i;
 538         es->err_buffer[i] = 0;
 539     }
 540
 541     if (file != NULL && line != NULL) {
 542         if (es->err_file[i] == NULL) {
 543             *file = "NA";
 544             *line = 0;
 545         } else {
 546             *file = es->err_file[i];
 547             *line = es->err_line[i];
 548         }
 549     }
 550
 551     if (data == NULL) {
 552         if (inc) {
 553             err_clear_data(es, i);
 554         }
 555     } else {
 556         if (es->err_data[i] == NULL) {
 557             *data = "";
 558             if (flags != NULL)
 559                 *flags = 0;
 560         } else {
 561             *data = es->err_data[i];
 562             if (flags != NULL)
 563                 *flags = es->err_data_flags[i];
 564         }
 565     }
 566     return ret;
 567 }
 568
 569 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
 570 {
 571     char lsbuf[64], fsbuf[64], rsbuf[64];
 572     const char *ls, *fs, *rs;
 573     unsigned long l, f, r;
 574
 575     if (len == 0)
 576         return;
 577
 578     l = ERR_GET_LIB(e);
 579     ls = ERR_lib_error_string(e);
 580     if (ls == NULL) {
 581         BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
 582         ls = lsbuf;
 583     }
 584
 585     fs = ERR_func_error_string(e);
 586     f = ERR_GET_FUNC(e);
 587     if (fs == NULL) {
 588         BIO_snprintf(fsbuf, sizeof(fsbuf), "func(%lu)", f);
 589         fs = fsbuf;
 590     }
 591
 592     rs = ERR_reason_error_string(e);
 593     r = ERR_GET_REASON(e);
 594     if (rs == NULL) {
 595         BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
 596         rs = rsbuf;
 597     }
 598
 599     BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, fs, rs);
 600     if (strlen(buf) == len - 1) {
 601         /* Didn't fit; use a minimal format. */
 602         BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, f, r);
 603     }
 604 }
 605
 606 /*
 607  * ERR_error_string_n should be used instead for ret != NULL as
 608  * ERR_error_string cannot know how large the buffer is
 609  */
 610 char *ERR_error_string(unsigned long e, char *ret)
 611 {
 612     static char buf[256];
 613
 614     if (ret == NULL)
 615         ret = buf;
 616     ERR_error_string_n(e, ret, (int)sizeof(buf));
 617     return ret;
 618 }
 619
 620 const char *ERR_lib_error_string(unsigned long e)
 621 {
 622     ERR_STRING_DATA d, *p;
 623     unsigned long l;
 624
 625     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 626         return NULL;
 627     }
 628
 629     l = ERR_GET_LIB(e);
 630     d.error = ERR_PACK(l, 0, 0);
 631     p = int_err_get_item(&d);
 632     return ((p == NULL) ? NULL : p->string);
 633 }
 634
 635 const char *ERR_func_error_string(unsigned long e)
 636 {
 637     ERR_STRING_DATA d, *p;
 638     unsigned long l, f;
 639
 640     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 641         return NULL;
 642     }
 643
 644     l = ERR_GET_LIB(e);
 645     f = ERR_GET_FUNC(e);
 646     d.error = ERR_PACK(l, f, 0);
 647     p = int_err_get_item(&d);
 648     return ((p == NULL) ? NULL : p->string);
 649 }
 650
 651 const char *ERR_reason_error_string(unsigned long e)
 652 {
 653     ERR_STRING_DATA d, *p = NULL;
 654     unsigned long l, r;
 655
 656     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 657         return NULL;
 658     }
 659
 660     l = ERR_GET_LIB(e);
 661     r = ERR_GET_REASON(e);
 662     d.error = ERR_PACK(l, 0, r);
 663     p = int_err_get_item(&d);
 664     if (!p) {
 665         d.error = ERR_PACK(0, 0, r);
 666         p = int_err_get_item(&d);
 667     }
 668     return ((p == NULL) ? NULL : p->string);
 669 }
 670
 671 void err_delete_thread_state(void)
 672 {
 673     ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
 674     if (state == NULL)
 675         return;
 676
 677     CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 678     ERR_STATE_free(state);
 679 }
 680
 681 #if !OPENSSL_API_1_1_0
 682 void ERR_remove_thread_state(void *dummy)
 683 {
 684 }
 685 #endif
 686
 687 #if !OPENSSL_API_1_0_0
 688 void ERR_remove_state(unsigned long pid)
 689 {
 690 }
 691 #endif
 692
 693 DEFINE_RUN_ONCE_STATIC(err_do_init)
 694 {
 695     set_err_thread_local = 1;
 696     return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
 697 }
 698
 699 ERR_STATE *ERR_get_state(void)
 700 {
 701     ERR_STATE *state;
 702     int saveerrno = get_last_sys_error();
 703
 704     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 705         return NULL;
 706
 707     if (!RUN_ONCE(&err_init, err_do_init))
 708         return NULL;
 709
 710     state = CRYPTO_THREAD_get_local(&err_thread_local);
 711     if (state == (ERR_STATE*)-1)
 712         return NULL;
 713
 714     if (state == NULL) {
 715         if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 716             return NULL;
 717
 718         if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
 719             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 720             return NULL;
 721         }
 722
 723         if (!ossl_init_thread_start(OPENSSL_INIT_THREAD_ERR_STATE)
 724                 || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
 725             ERR_STATE_free(state);
 726             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 727             return NULL;
 728         }
 729
 730         /* Ignore failures from these */
 731         OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 732     }
 733
 734     set_sys_error(saveerrno);
 735     return state;
 736 }
 737
 738 /*
 739  * err_shelve_state returns the current thread local error state
 740  * and freezes the error module until err_unshelve_state is called.
 741  */
 742 int err_shelve_state(void **state)
 743 {
 744     int saveerrno = get_last_sys_error();
 745
 746     /*
 747      * Note, at present our only caller is OPENSSL_init_crypto(), indirectly
 748      * via ossl_init_load_crypto_nodelete(), by which point the requested
 749      * "base" initialization has already been performed, so the below call is a
 750      * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
 751      *
 752      * If are no other valid callers of this function, the call below can be
 753      * removed, avoiding the re-entry into OPENSSL_init_crypto().  If there are
 754      * potential uses that are not from inside OPENSSL_init_crypto(), then this
 755      * call is needed, but some care is required to make sure that the re-entry
 756      * remains a NOOP.
 757      */
 758     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 759         return 0;
 760
 761     if (!RUN_ONCE(&err_init, err_do_init))
 762         return 0;
 763
 764     *state = CRYPTO_THREAD_get_local(&err_thread_local);
 765     if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 766         return 0;
 767
 768     set_sys_error(saveerrno);
 769     return 1;
 770 }
 771
 772 /*
 773  * err_unshelve_state restores the error state that was returned
 774  * by err_shelve_state previously.
 775  */
 776 void err_unshelve_state(void* state)
 777 {
 778     if (state != (void*)-1)
 779         CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
 780 }
 781
 782 int ERR_get_next_error_library(void)
 783 {
 784     int ret;
 785
 786     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 787         return 0;
 788
 789     CRYPTO_THREAD_write_lock(err_string_lock);
 790     ret = int_err_library_number++;
 791     CRYPTO_THREAD_unlock(err_string_lock);
 792     return ret;
 793 }
 794
 795 static int err_set_error_data_int(char *data, int flags)
 796 {
 797     ERR_STATE *es;
 798     int i;
 799
 800     es = ERR_get_state();
 801     if (es == NULL)
 802         return 0;
 803
 804     i = es->top;
 805
 806     err_clear_data(es, i);
 807     es->err_data[i] = data;
 808     es->err_data_flags[i] = flags;
 809
 810     return 1;
 811 }
 812
 813 void ERR_set_error_data(char *data, int flags)
 814 {
 815     /*
 816      * This function is void so we cannot propagate the error return. Since it
 817      * is also in the public API we can't change the return type.
 818      */
 819     err_set_error_data_int(data, flags);
 820 }
 821
 822 void ERR_add_error_data(int num, ...)
 823 {
 824     va_list args;
 825     va_start(args, num);
 826     ERR_add_error_vdata(num, args);
 827     va_end(args);
 828 }
 829
 830 void ERR_add_error_vdata(int num, va_list args)
 831 {
 832     int i, n, s;
 833     char *str, *p, *a;
 834
 835     s = 80;
 836     if ((str = OPENSSL_malloc(s + 1)) == NULL) {
 837         /* ERRerr(ERR_F_ERR_ADD_ERROR_VDATA, ERR_R_MALLOC_FAILURE); */
 838         return;
 839     }
 840     str[0] = '\0';
 841
 842     n = 0;
 843     for (i = 0; i < num; i++) {
 844         a = va_arg(args, char *);
 845         if (a == NULL)
 846             a = "<NULL>";
 847         n += strlen(a);
 848         if (n > s) {
 849             s = n + 20;
 850             p = OPENSSL_realloc(str, s + 1);
 851             if (p == NULL) {
 852                 OPENSSL_free(str);
 853                 return;
 854             }
 855             str = p;
 856         }
 857         OPENSSL_strlcat(str, a, (size_t)s + 1);
 858     }
 859     if (!err_set_error_data_int(str, ERR_TXT_MALLOCED | ERR_TXT_STRING))
 860         OPENSSL_free(str);
 861 }
 862
 863 int ERR_set_mark(void)
 864 {
 865     ERR_STATE *es;
 866
 867     es = ERR_get_state();
 868     if (es == NULL)
 869         return 0;
 870
 871     if (es->bottom == es->top)
 872         return 0;
 873     es->err_flags[es->top] |= ERR_FLAG_MARK;
 874     return 1;
 875 }
 876
 877 int ERR_pop_to_mark(void)
 878 {
 879     ERR_STATE *es;
 880
 881     es = ERR_get_state();
 882     if (es == NULL)
 883         return 0;
 884
 885     while (es->bottom != es->top
 886            && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
 887         err_clear(es, es->top);
 888         es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
 889     }
 890
 891     if (es->bottom == es->top)
 892         return 0;
 893     es->err_flags[es->top] &= ~ERR_FLAG_MARK;
 894     return 1;
 895 }
 896
 897 int ERR_clear_last_mark(void)
 898 {
 899     ERR_STATE *es;
 900     int top;
 901
 902     es = ERR_get_state();
 903     if (es == NULL)
 904         return 0;
 905
 906     top = es->top;
 907     while (es->bottom != top
 908            && (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
 909         top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
 910     }
 911
 912     if (es->bottom == top)
 913         return 0;
 914     es->err_flags[top] &= ~ERR_FLAG_MARK;
 915     return 1;
 916 }
 917
 918 #ifdef UINTPTR_T
 919 # undef UINTPTR_T
 920 #endif
 921 /*
 922  * uintptr_t is the answer, but unfortunately C89, current "least common
 923  * denominator" doesn't define it. Most legacy platforms typedef it anyway,
 924  * so that attempt to fill the gaps means that one would have to identify
 925  * that track these gaps, which would be undesirable. Macro it is...
 926  */
 927 #if defined(__VMS) && __INITIAL_POINTER_SIZE==64
 928 /*
 929  * But we can't use size_t on VMS, because it adheres to sizeof(size_t)==4
 930  * even in 64-bit builds, which means that it won't work as mask.
 931  */
 932 # define UINTPTR_T unsigned long long
 933 #else
 934 # define UINTPTR_T size_t
 935 #endif
 936
 937 void err_clear_last_constant_time(int clear)
 938 {
 939     ERR_STATE *es;
 940     int top;
 941
 942     es = ERR_get_state();
 943     if (es == NULL)
 944         return;
 945
 946     top = es->top;
 947
 948     es->err_flags[top] &= ~(0 - clear);
 949     es->err_buffer[top] &= ~(0UL - clear);
 950     es->err_file[top] = (const char *)((UINTPTR_T)es->err_file[top] &
 951                                        ~((UINTPTR_T)0 - clear));
 952     es->err_line[top] |= 0 - clear;
 953
 954     es->top = (top + ERR_NUM_ERRORS - clear) % ERR_NUM_ERRORS;
 955 }