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 #include "err_locl.h"
  26
  27 static int err_load_strings(const ERR_STRING_DATA *str);
  28
  29 static void ERR_STATE_free(ERR_STATE *s);
  30 #ifndef OPENSSL_NO_ERR
  31 static ERR_STRING_DATA ERR_str_libraries[] = {
  32     {ERR_PACK(ERR_LIB_NONE, 0, 0), "unknown library"},
  33     {ERR_PACK(ERR_LIB_SYS, 0, 0), "system library"},
  34     {ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines"},
  35     {ERR_PACK(ERR_LIB_RSA, 0, 0), "rsa routines"},
  36     {ERR_PACK(ERR_LIB_DH, 0, 0), "Diffie-Hellman routines"},
  37     {ERR_PACK(ERR_LIB_EVP, 0, 0), "digital envelope routines"},
  38     {ERR_PACK(ERR_LIB_BUF, 0, 0), "memory buffer routines"},
  39     {ERR_PACK(ERR_LIB_OBJ, 0, 0), "object identifier routines"},
  40     {ERR_PACK(ERR_LIB_PEM, 0, 0), "PEM routines"},
  41     {ERR_PACK(ERR_LIB_DSA, 0, 0), "dsa routines"},
  42     {ERR_PACK(ERR_LIB_X509, 0, 0), "x509 certificate routines"},
  43     {ERR_PACK(ERR_LIB_ASN1, 0, 0), "asn1 encoding routines"},
  44     {ERR_PACK(ERR_LIB_CONF, 0, 0), "configuration file routines"},
  45     {ERR_PACK(ERR_LIB_CRYPTO, 0, 0), "common libcrypto routines"},
  46     {ERR_PACK(ERR_LIB_EC, 0, 0), "elliptic curve routines"},
  47     {ERR_PACK(ERR_LIB_ECDSA, 0, 0), "ECDSA routines"},
  48     {ERR_PACK(ERR_LIB_ECDH, 0, 0), "ECDH routines"},
  49     {ERR_PACK(ERR_LIB_SSL, 0, 0), "SSL routines"},
  50     {ERR_PACK(ERR_LIB_BIO, 0, 0), "BIO routines"},
  51     {ERR_PACK(ERR_LIB_PKCS7, 0, 0), "PKCS7 routines"},
  52     {ERR_PACK(ERR_LIB_X509V3, 0, 0), "X509 V3 routines"},
  53     {ERR_PACK(ERR_LIB_PKCS12, 0, 0), "PKCS12 routines"},
  54     {ERR_PACK(ERR_LIB_RAND, 0, 0), "random number generator"},
  55     {ERR_PACK(ERR_LIB_DSO, 0, 0), "DSO support routines"},
  56     {ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines"},
  57     {ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines"},
  58     {ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines"},
  59     {ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines"},
  60     {ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines"},
  61     {ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines"},
  62     {ERR_PACK(ERR_LIB_CRMF, 0, 0), "CRMF routines"},
  63     {ERR_PACK(ERR_LIB_CMP, 0, 0), "CMP routines"},
  64     {ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines"},
  65     {ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines"},
  66     {ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC routines"},
  67     {ERR_PACK(ERR_LIB_KDF, 0, 0), "KDF routines"},
  68     {ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines"},
  69     {ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines"},
  70     {ERR_PACK(ERR_LIB_ESS, 0, 0), "ESS routines"},
  71     {ERR_PACK(ERR_LIB_PROV, 0, 0), "Provider routines"},
  72     {0, NULL},
  73 };
  74
  75 static ERR_STRING_DATA ERR_str_reasons[] = {
  76     {ERR_R_SYS_LIB, "system lib"},
  77     {ERR_R_BN_LIB, "BN lib"},
  78     {ERR_R_RSA_LIB, "RSA lib"},
  79     {ERR_R_DH_LIB, "DH lib"},
  80     {ERR_R_EVP_LIB, "EVP lib"},
  81     {ERR_R_BUF_LIB, "BUF lib"},
  82     {ERR_R_OBJ_LIB, "OBJ lib"},
  83     {ERR_R_PEM_LIB, "PEM lib"},
  84     {ERR_R_DSA_LIB, "DSA lib"},
  85     {ERR_R_X509_LIB, "X509 lib"},
  86     {ERR_R_ASN1_LIB, "ASN1 lib"},
  87     {ERR_R_EC_LIB, "EC lib"},
  88     {ERR_R_BIO_LIB, "BIO lib"},
  89     {ERR_R_PKCS7_LIB, "PKCS7 lib"},
  90     {ERR_R_X509V3_LIB, "X509V3 lib"},
  91     {ERR_R_ENGINE_LIB, "ENGINE lib"},
  92     {ERR_R_UI_LIB, "UI lib"},
  93     {ERR_R_OSSL_STORE_LIB, "STORE lib"},
  94     {ERR_R_ECDSA_LIB, "ECDSA lib"},
  95
  96     {ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
  97     {ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
  98
  99     {ERR_R_FATAL, "fatal"},
 100     {ERR_R_MALLOC_FAILURE, "malloc failure"},
 101     {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
 102      "called a function you should not call"},
 103     {ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
 104     {ERR_R_INTERNAL_ERROR, "internal error"},
 105     {ERR_R_DISABLED, "called a function that was disabled at compile-time"},
 106     {ERR_R_INIT_FAIL, "init fail"},
 107     {ERR_R_OPERATION_FAIL, "operation fail"},
 108
 109     {0, NULL},
 110 };
 111 #endif
 112
 113 static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
 114 static int set_err_thread_local;
 115 static CRYPTO_THREAD_LOCAL err_thread_local;
 116
 117 static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
 118 static CRYPTO_RWLOCK *err_string_lock;
 119
 120 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
 121
 122 /*
 123  * The internal state
 124  */
 125
 126 static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
 127 static int int_err_library_number = ERR_LIB_USER;
 128
 129 static unsigned long get_error_values(int inc, int top, const char **file,
 130                                       int *line, const char **data,
 131                                       int *flags);
 132
 133 static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
 134 {
 135     unsigned long ret, l;
 136
 137     l = a->error;
 138     ret = l ^ ERR_GET_LIB(l);
 139     return (ret ^ ret % 19 * 13);
 140 }
 141
 142 static int err_string_data_cmp(const ERR_STRING_DATA *a,
 143                                const ERR_STRING_DATA *b)
 144 {
 145     if (a->error == b->error)
 146         return 0;
 147     return a->error > b->error ? 1 : -1;
 148 }
 149
 150 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
 151 {
 152     ERR_STRING_DATA *p = NULL;
 153
 154     CRYPTO_THREAD_read_lock(err_string_lock);
 155     p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
 156     CRYPTO_THREAD_unlock(err_string_lock);
 157
 158     return p;
 159 }
 160
 161 #ifndef OPENSSL_NO_ERR
 162 /* 2019-05-21: Russian and Ukrainian locales on Linux require more than 6,5 kB */
 163 # define SPACE_SYS_STR_REASONS 8 * 1024
 164 # define NUM_SYS_STR_REASONS 127
 165
 166 static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
 167 /*
 168  * SYS_str_reasons is filled with copies of strerror() results at
 169  * initialization. 'errno' values up to 127 should cover all usual errors,
 170  * others will be displayed numerically by ERR_error_string. It is crucial
 171  * that we have something for each reason code that occurs in
 172  * ERR_str_reasons, or bogus reason strings will be returned for SYSerr(),
 173  * which always gets an errno value and never one of those 'standard' reason
 174  * codes.
 175  */
 176
 177 static void build_SYS_str_reasons(void)
 178 {
 179     /* OPENSSL_malloc cannot be used here, use static storage instead */
 180     static char strerror_pool[SPACE_SYS_STR_REASONS];
 181     char *cur = strerror_pool;
 182     size_t cnt = 0;
 183     static int init = 1;
 184     int i;
 185     int saveerrno = get_last_sys_error();
 186
 187     CRYPTO_THREAD_write_lock(err_string_lock);
 188     if (!init) {
 189         CRYPTO_THREAD_unlock(err_string_lock);
 190         return;
 191     }
 192
 193     for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
 194         ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
 195
 196         str->error = ERR_PACK(ERR_LIB_SYS, 0, i);
 197         /*
 198          * If we have used up all the space in strerror_pool,
 199          * there's no point in calling openssl_strerror_r()
 200          */
 201         if (str->string == NULL && cnt < sizeof(strerror_pool)) {
 202             if (openssl_strerror_r(i, cur, sizeof(strerror_pool) - cnt)) {
 203                 size_t l = strlen(cur);
 204
 205                 str->string = cur;
 206                 cnt += l;
 207                 cur += l;
 208
 209                 /*
 210                  * VMS has an unusual quirk of adding spaces at the end of
 211                  * some (most? all?) messages. Lets trim them off.
 212                  */
 213                 while (cur > strerror_pool && ossl_isspace(cur[-1])) {
 214                     cur--;
 215                     cnt--;
 216                 }
 217                 *cur++ = '\0';
 218                 cnt++;
 219             }
 220         }
 221         if (str->string == NULL)
 222             str->string = "unknown";
 223     }
 224
 225     /*
 226      * Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL}, as
 227      * required by ERR_load_strings.
 228      */
 229
 230     init = 0;
 231
 232     CRYPTO_THREAD_unlock(err_string_lock);
 233     /* openssl_strerror_r could change errno, but we want to preserve it */
 234     set_sys_error(saveerrno);
 235     err_load_strings(SYS_str_reasons);
 236 }
 237 #endif
 238
 239 static void ERR_STATE_free(ERR_STATE *s)
 240 {
 241     int i;
 242
 243     if (s == NULL)
 244         return;
 245     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 246         err_clear_data(s, i, 1);
 247     }
 248     OPENSSL_free(s);
 249 }
 250
 251 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
 252 {
 253     if (!OPENSSL_init_crypto(0, NULL))
 254         return 0;
 255     err_string_lock = CRYPTO_THREAD_lock_new();
 256     if (err_string_lock == NULL)
 257         return 0;
 258     int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
 259                                             err_string_data_cmp);
 260     if (int_error_hash == NULL) {
 261         CRYPTO_THREAD_lock_free(err_string_lock);
 262         err_string_lock = NULL;
 263         return 0;
 264     }
 265     return 1;
 266 }
 267
 268 void err_cleanup(void)
 269 {
 270     if (set_err_thread_local != 0)
 271         CRYPTO_THREAD_cleanup_local(&err_thread_local);
 272     CRYPTO_THREAD_lock_free(err_string_lock);
 273     err_string_lock = NULL;
 274     lh_ERR_STRING_DATA_free(int_error_hash);
 275     int_error_hash = NULL;
 276 }
 277
 278 /*
 279  * Legacy; pack in the library.
 280  */
 281 static void err_patch(int lib, ERR_STRING_DATA *str)
 282 {
 283     unsigned long plib = ERR_PACK(lib, 0, 0);
 284
 285     for (; str->error != 0; str++)
 286         str->error |= plib;
 287 }
 288
 289 /*
 290  * Hash in |str| error strings. Assumes the URN_ONCE was done.
 291  */
 292 static int err_load_strings(const ERR_STRING_DATA *str)
 293 {
 294     CRYPTO_THREAD_write_lock(err_string_lock);
 295     for (; str->error; str++)
 296         (void)lh_ERR_STRING_DATA_insert(int_error_hash,
 297                                        (ERR_STRING_DATA *)str);
 298     CRYPTO_THREAD_unlock(err_string_lock);
 299     return 1;
 300 }
 301
 302 int ERR_load_ERR_strings(void)
 303 {
 304 #ifndef OPENSSL_NO_ERR
 305     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 306         return 0;
 307
 308     err_load_strings(ERR_str_libraries);
 309     err_load_strings(ERR_str_reasons);
 310     build_SYS_str_reasons();
 311 #endif
 312     return 1;
 313 }
 314
 315 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
 316 {
 317     if (ERR_load_ERR_strings() == 0)
 318         return 0;
 319
 320     err_patch(lib, str);
 321     err_load_strings(str);
 322     return 1;
 323 }
 324
 325 int ERR_load_strings_const(const ERR_STRING_DATA *str)
 326 {
 327     if (ERR_load_ERR_strings() == 0)
 328         return 0;
 329     err_load_strings(str);
 330     return 1;
 331 }
 332
 333 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
 334 {
 335     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 336         return 0;
 337
 338     CRYPTO_THREAD_write_lock(err_string_lock);
 339     /*
 340      * We don't need to ERR_PACK the lib, since that was done (to
 341      * the table) when it was loaded.
 342      */
 343     for (; str->error; str++)
 344         (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
 345     CRYPTO_THREAD_unlock(err_string_lock);
 346
 347     return 1;
 348 }
 349
 350 void err_free_strings_int(void)
 351 {
 352     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 353         return;
 354 }
 355
 356 /********************************************************/
 357
 358 void ERR_clear_error(void)
 359 {
 360     int i;
 361     ERR_STATE *es;
 362
 363     es = ERR_get_state();
 364     if (es == NULL)
 365         return;
 366
 367     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 368         err_clear(es, i, 0);
 369     }
 370     es->top = es->bottom = 0;
 371 }
 372
 373 unsigned long ERR_get_error(void)
 374 {
 375     return get_error_values(1, 0, NULL, NULL, NULL, NULL);
 376 }
 377
 378 unsigned long ERR_get_error_line(const char **file, int *line)
 379 {
 380     return get_error_values(1, 0, file, line, NULL, NULL);
 381 }
 382
 383 unsigned long ERR_get_error_line_data(const char **file, int *line,
 384                                       const char **data, int *flags)
 385 {
 386     return get_error_values(1, 0, file, line, data, flags);
 387 }
 388
 389 unsigned long ERR_peek_error(void)
 390 {
 391     return get_error_values(0, 0, NULL, NULL, NULL, NULL);
 392 }
 393
 394 unsigned long ERR_peek_error_line(const char **file, int *line)
 395 {
 396     return get_error_values(0, 0, file, line, NULL, NULL);
 397 }
 398
 399 unsigned long ERR_peek_error_line_data(const char **file, int *line,
 400                                        const char **data, int *flags)
 401 {
 402     return get_error_values(0, 0, file, line, data, flags);
 403 }
 404
 405 unsigned long ERR_peek_last_error(void)
 406 {
 407     return get_error_values(0, 1, NULL, NULL, NULL, NULL);
 408 }
 409
 410 unsigned long ERR_peek_last_error_line(const char **file, int *line)
 411 {
 412     return get_error_values(0, 1, file, line, NULL, NULL);
 413 }
 414
 415 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
 416                                             const char **data, int *flags)
 417 {
 418     return get_error_values(0, 1, file, line, data, flags);
 419 }
 420
 421 static unsigned long get_error_values(int inc, int top, const char **file,
 422                                       int *line, const char **data,
 423                                       int *flags)
 424 {
 425     int i = 0;
 426     ERR_STATE *es;
 427     unsigned long ret;
 428
 429     es = ERR_get_state();
 430     if (es == NULL)
 431         return 0;
 432
 433     if (inc && top) {
 434         if (file)
 435             *file = "";
 436         if (line)
 437             *line = 0;
 438         if (data)
 439             *data = "";
 440         if (flags)
 441             *flags = 0;
 442
 443         return ERR_R_INTERNAL_ERROR;
 444     }
 445
 446     while (es->bottom != es->top) {
 447         if (es->err_flags[es->top] & ERR_FLAG_CLEAR) {
 448             err_clear(es, es->top, 0);
 449             es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
 450             continue;
 451         }
 452         i = (es->bottom + 1) % ERR_NUM_ERRORS;
 453         if (es->err_flags[i] & ERR_FLAG_CLEAR) {
 454             es->bottom = i;
 455             err_clear(es, es->bottom, 0);
 456             continue;
 457         }
 458         break;
 459     }
 460
 461     if (es->bottom == es->top)
 462         return 0;
 463
 464     if (top)
 465         i = es->top;            /* last error */
 466     else
 467         i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */
 468
 469     ret = es->err_buffer[i];
 470     if (inc) {
 471         es->bottom = i;
 472         es->err_buffer[i] = 0;
 473     }
 474
 475     if (file != NULL && line != NULL) {
 476         if (es->err_file[i] == NULL) {
 477             *file = "NA";
 478             *line = 0;
 479         } else {
 480             *file = es->err_file[i];
 481             *line = es->err_line[i];
 482         }
 483     }
 484
 485     if (data == NULL) {
 486         if (inc) {
 487             err_clear_data(es, i, 0);
 488         }
 489     } else {
 490         if (es->err_data[i] == NULL) {
 491             *data = "";
 492             if (flags != NULL)
 493                 *flags = 0;
 494         } else {
 495             *data = es->err_data[i];
 496             if (flags != NULL)
 497                 *flags = es->err_data_flags[i];
 498         }
 499     }
 500     return ret;
 501 }
 502
 503 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
 504 {
 505     char lsbuf[64], rsbuf[64];
 506     const char *ls, *rs;
 507     unsigned long f = 0, l, r;
 508
 509     if (len == 0)
 510         return;
 511
 512     l = ERR_GET_LIB(e);
 513     ls = ERR_lib_error_string(e);
 514     if (ls == NULL) {
 515         BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
 516         ls = lsbuf;
 517     }
 518
 519     rs = ERR_reason_error_string(e);
 520     r = ERR_GET_REASON(e);
 521     if (rs == NULL) {
 522         BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
 523         rs = rsbuf;
 524     }
 525
 526     BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, "", rs);
 527     if (strlen(buf) == len - 1) {
 528         /* Didn't fit; use a minimal format. */
 529         BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, f, r);
 530     }
 531 }
 532
 533 /*
 534  * ERR_error_string_n should be used instead for ret != NULL as
 535  * ERR_error_string cannot know how large the buffer is
 536  */
 537 char *ERR_error_string(unsigned long e, char *ret)
 538 {
 539     static char buf[256];
 540
 541     if (ret == NULL)
 542         ret = buf;
 543     ERR_error_string_n(e, ret, (int)sizeof(buf));
 544     return ret;
 545 }
 546
 547 const char *ERR_lib_error_string(unsigned long e)
 548 {
 549     ERR_STRING_DATA d, *p;
 550     unsigned long l;
 551
 552     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 553         return NULL;
 554     }
 555
 556     l = ERR_GET_LIB(e);
 557     d.error = ERR_PACK(l, 0, 0);
 558     p = int_err_get_item(&d);
 559     return ((p == NULL) ? NULL : p->string);
 560 }
 561
 562 const char *ERR_func_error_string(unsigned long e)
 563 {
 564     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 565         return NULL;
 566     return ERR_GET_LIB(e) == ERR_LIB_SYS ? "system library" : NULL;
 567 }
 568
 569 const char *ERR_reason_error_string(unsigned long e)
 570 {
 571     ERR_STRING_DATA d, *p = NULL;
 572     unsigned long l, r;
 573
 574     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 575         return NULL;
 576     }
 577
 578     l = ERR_GET_LIB(e);
 579     r = ERR_GET_REASON(e);
 580     d.error = ERR_PACK(l, 0, r);
 581     p = int_err_get_item(&d);
 582     if (!p) {
 583         d.error = ERR_PACK(0, 0, r);
 584         p = int_err_get_item(&d);
 585     }
 586     return ((p == NULL) ? NULL : p->string);
 587 }
 588
 589 /* TODO(3.0): arg ignored for now */
 590 static void err_delete_thread_state(void *arg)
 591 {
 592     ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
 593     if (state == NULL)
 594         return;
 595
 596     CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 597     ERR_STATE_free(state);
 598 }
 599
 600 #if !OPENSSL_API_1_1_0
 601 void ERR_remove_thread_state(void *dummy)
 602 {
 603 }
 604 #endif
 605
 606 #if !OPENSSL_API_1_0_0
 607 void ERR_remove_state(unsigned long pid)
 608 {
 609 }
 610 #endif
 611
 612 DEFINE_RUN_ONCE_STATIC(err_do_init)
 613 {
 614     set_err_thread_local = 1;
 615     return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
 616 }
 617
 618 ERR_STATE *ERR_get_state(void)
 619 {
 620     ERR_STATE *state;
 621     int saveerrno = get_last_sys_error();
 622
 623     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 624         return NULL;
 625
 626     if (!RUN_ONCE(&err_init, err_do_init))
 627         return NULL;
 628
 629     state = CRYPTO_THREAD_get_local(&err_thread_local);
 630     if (state == (ERR_STATE*)-1)
 631         return NULL;
 632
 633     if (state == NULL) {
 634         if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 635             return NULL;
 636
 637         if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
 638             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 639             return NULL;
 640         }
 641
 642         if (!ossl_init_thread_start(NULL, NULL, err_delete_thread_state)
 643                 || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
 644             ERR_STATE_free(state);
 645             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 646             return NULL;
 647         }
 648
 649         /* Ignore failures from these */
 650         OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 651     }
 652
 653     set_sys_error(saveerrno);
 654     return state;
 655 }
 656
 657 /*
 658  * err_shelve_state returns the current thread local error state
 659  * and freezes the error module until err_unshelve_state is called.
 660  */
 661 int err_shelve_state(void **state)
 662 {
 663     int saveerrno = get_last_sys_error();
 664
 665     /*
 666      * Note, at present our only caller is OPENSSL_init_crypto(), indirectly
 667      * via ossl_init_load_crypto_nodelete(), by which point the requested
 668      * "base" initialization has already been performed, so the below call is a
 669      * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
 670      *
 671      * If are no other valid callers of this function, the call below can be
 672      * removed, avoiding the re-entry into OPENSSL_init_crypto().  If there are
 673      * potential uses that are not from inside OPENSSL_init_crypto(), then this
 674      * call is needed, but some care is required to make sure that the re-entry
 675      * remains a NOOP.
 676      */
 677     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 678         return 0;
 679
 680     if (!RUN_ONCE(&err_init, err_do_init))
 681         return 0;
 682
 683     *state = CRYPTO_THREAD_get_local(&err_thread_local);
 684     if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 685         return 0;
 686
 687     set_sys_error(saveerrno);
 688     return 1;
 689 }
 690
 691 /*
 692  * err_unshelve_state restores the error state that was returned
 693  * by err_shelve_state previously.
 694  */
 695 void err_unshelve_state(void* state)
 696 {
 697     if (state != (void*)-1)
 698         CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
 699 }
 700
 701 int ERR_get_next_error_library(void)
 702 {
 703     int ret;
 704
 705     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 706         return 0;
 707
 708     CRYPTO_THREAD_write_lock(err_string_lock);
 709     ret = int_err_library_number++;
 710     CRYPTO_THREAD_unlock(err_string_lock);
 711     return ret;
 712 }
 713
 714 static int err_set_error_data_int(char *data, size_t size, int flags,
 715                                   int deallocate)
 716 {
 717     ERR_STATE *es;
 718
 719     es = ERR_get_state();
 720     if (es == NULL)
 721         return 0;
 722
 723     err_clear_data(es, es->top, deallocate);
 724     err_set_data(es, es->top, data, size, flags);
 725
 726     return 1;
 727 }
 728
 729 void ERR_set_error_data(char *data, int flags)
 730 {
 731     /*
 732      * This function is void so we cannot propagate the error return. Since it
 733      * is also in the public API we can't change the return type.
 734      *
 735      * We estimate the size of the data.  If it's not flagged as allocated,
 736      * then this is safe, and if it is flagged as allocated, then our size
 737      * may be smaller than the actual allocation, but that doesn't matter
 738      * too much, the buffer will remain untouched or will eventually be
 739      * reallocated to a new size.
 740      *
 741      * callers should be advised that this function takes over ownership of
 742      * the allocated memory, i.e. they can't count on the pointer to remain
 743      * valid.
 744      */
 745     err_set_error_data_int(data, strlen(data) + 1, flags, 1);
 746 }
 747
 748 void ERR_add_error_data(int num, ...)
 749 {
 750     va_list args;
 751     va_start(args, num);
 752     ERR_add_error_vdata(num, args);
 753     va_end(args);
 754 }
 755
 756 void ERR_add_error_vdata(int num, va_list args)
 757 {
 758     int i, len, size;
 759     int flags = ERR_TXT_MALLOCED | ERR_TXT_STRING;
 760     char *str, *arg;
 761     ERR_STATE *es;
 762
 763     /* Get the current error data; if an allocated string get it. */
 764     es = ERR_get_state();
 765     if (es == NULL)
 766         return;
 767     i = es->top;
 768
 769     /*
 770      * If err_data is allocated already, re-use the space.
 771      * Otherwise, allocate a small new buffer.
 772      */
 773     if ((es->err_data_flags[i] & flags) == flags) {
 774         str = es->err_data[i];
 775         size = es->err_data_size[i];
 776
 777         /*
 778          * To protect the string we just grabbed from tampering by other
 779          * functions we may call, or to protect them from freeing a pointer
 780          * that may no longer be valid at that point, we clear away the
 781          * data pointer and the flags.  We will set them again at the end
 782          * of this function.
 783          */
 784         es->err_data[i] = NULL;
 785         es->err_data_flags[i] = 0;
 786     } else if ((str = OPENSSL_malloc(size = 81)) == NULL) {
 787         return;
 788     } else {
 789         str[0] = '\0';
 790     }
 791     len = strlen(str);
 792
 793     for (len = 0; --num >= 0; ) {
 794         arg = va_arg(args, char *);
 795         if (arg == NULL)
 796             arg = "<NULL>";
 797         len += strlen(arg);
 798         if (len > size) {
 799             char *p;
 800
 801             size = len + 20;
 802             p = OPENSSL_realloc(str, size + 1);
 803             if (p == NULL) {
 804                 OPENSSL_free(str);
 805                 return;
 806             }
 807             str = p;
 808         }
 809         OPENSSL_strlcat(str, arg, (size_t)size + 1);
 810     }
 811     if (!err_set_error_data_int(str, size, flags, 0))
 812         OPENSSL_free(str);
 813 }
 814
 815 int ERR_set_mark(void)
 816 {
 817     ERR_STATE *es;
 818
 819     es = ERR_get_state();
 820     if (es == NULL)
 821         return 0;
 822
 823     if (es->bottom == es->top)
 824         return 0;
 825     es->err_flags[es->top] |= ERR_FLAG_MARK;
 826     return 1;
 827 }
 828
 829 int ERR_pop_to_mark(void)
 830 {
 831     ERR_STATE *es;
 832
 833     es = ERR_get_state();
 834     if (es == NULL)
 835         return 0;
 836
 837     while (es->bottom != es->top
 838            && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
 839         err_clear(es, es->top, 0);
 840         es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
 841     }
 842
 843     if (es->bottom == es->top)
 844         return 0;
 845     es->err_flags[es->top] &= ~ERR_FLAG_MARK;
 846     return 1;
 847 }
 848
 849 int ERR_clear_last_mark(void)
 850 {
 851     ERR_STATE *es;
 852     int top;
 853
 854     es = ERR_get_state();
 855     if (es == NULL)
 856         return 0;
 857
 858     top = es->top;
 859     while (es->bottom != top
 860            && (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
 861         top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
 862     }
 863
 864     if (es->bottom == top)
 865         return 0;
 866     es->err_flags[top] &= ~ERR_FLAG_MARK;
 867     return 1;
 868 }
 869
 870 void err_clear_last_constant_time(int clear)
 871 {
 872     ERR_STATE *es;
 873     int top;
 874
 875     es = ERR_get_state();
 876     if (es == NULL)
 877         return;
 878
 879     top = es->top;
 880
 881     /*
 882      * Flag error as cleared but remove it elsewhere to avoid two errors
 883      * accessing the same error stack location, revealing timing information.
 884      */
 885     clear = constant_time_select_int(constant_time_eq_int(clear, 0),
 886                                      0, ERR_FLAG_CLEAR);
 887     es->err_flags[top] |= clear;
 888 }