crypto/err/err.c

   1 /*
   2  * Copyright 1995-2020 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 /* TODO: When ERR_STATE becomes opaque, this musts be removed */
  11 #define OSSL_FORCE_ERR_STATE
  12
  13 #include <stdio.h>
  14 #include <stdarg.h>
  15 #include <string.h>
  16 #include "crypto/cryptlib.h"
  17 #include "internal/err.h"
  18 #include "crypto/err.h"
  19 #include <openssl/err.h>
  20 #include <openssl/crypto.h>
  21 #include <openssl/buffer.h>
  22 #include <openssl/bio.h>
  23 #include <openssl/opensslconf.h>
  24 #include "internal/thread_once.h"
  25 #include "crypto/ctype.h"
  26 #include "internal/constant_time.h"
  27 #include "e_os.h"
  28 #include "err_local.h"
  29
  30 /* Forward declaration in case it's not published because of configuration */
  31 ERR_STATE *ERR_get_state(void);
  32
  33 static int err_load_strings(const ERR_STRING_DATA *str);
  34
  35 static void ERR_STATE_free(ERR_STATE *s);
  36 #ifndef OPENSSL_NO_ERR
  37 static ERR_STRING_DATA ERR_str_libraries[] = {
  38     {ERR_PACK(ERR_LIB_NONE, 0, 0), "unknown library"},
  39     {ERR_PACK(ERR_LIB_SYS, 0, 0), "system library"},
  40     {ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines"},
  41     {ERR_PACK(ERR_LIB_RSA, 0, 0), "rsa routines"},
  42     {ERR_PACK(ERR_LIB_DH, 0, 0), "Diffie-Hellman routines"},
  43     {ERR_PACK(ERR_LIB_EVP, 0, 0), "digital envelope routines"},
  44     {ERR_PACK(ERR_LIB_BUF, 0, 0), "memory buffer routines"},
  45     {ERR_PACK(ERR_LIB_OBJ, 0, 0), "object identifier routines"},
  46     {ERR_PACK(ERR_LIB_PEM, 0, 0), "PEM routines"},
  47     {ERR_PACK(ERR_LIB_DSA, 0, 0), "dsa routines"},
  48     {ERR_PACK(ERR_LIB_X509, 0, 0), "x509 certificate routines"},
  49     {ERR_PACK(ERR_LIB_ASN1, 0, 0), "asn1 encoding routines"},
  50     {ERR_PACK(ERR_LIB_CONF, 0, 0), "configuration file routines"},
  51     {ERR_PACK(ERR_LIB_CRYPTO, 0, 0), "common libcrypto routines"},
  52     {ERR_PACK(ERR_LIB_EC, 0, 0), "elliptic curve routines"},
  53     {ERR_PACK(ERR_LIB_ECDSA, 0, 0), "ECDSA routines"},
  54     {ERR_PACK(ERR_LIB_ECDH, 0, 0), "ECDH routines"},
  55     {ERR_PACK(ERR_LIB_SSL, 0, 0), "SSL routines"},
  56     {ERR_PACK(ERR_LIB_BIO, 0, 0), "BIO routines"},
  57     {ERR_PACK(ERR_LIB_PKCS7, 0, 0), "PKCS7 routines"},
  58     {ERR_PACK(ERR_LIB_X509V3, 0, 0), "X509 V3 routines"},
  59     {ERR_PACK(ERR_LIB_PKCS12, 0, 0), "PKCS12 routines"},
  60     {ERR_PACK(ERR_LIB_RAND, 0, 0), "random number generator"},
  61     {ERR_PACK(ERR_LIB_DSO, 0, 0), "DSO support routines"},
  62     {ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines"},
  63     {ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines"},
  64     {ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines"},
  65     {ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines"},
  66     {ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines"},
  67     {ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines"},
  68     {ERR_PACK(ERR_LIB_CRMF, 0, 0), "CRMF routines"},
  69     {ERR_PACK(ERR_LIB_CMP, 0, 0), "CMP routines"},
  70     {ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines"},
  71     {ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines"},
  72     {ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC routines"},
  73     {ERR_PACK(ERR_LIB_KDF, 0, 0), "KDF routines"},
  74     {ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines"},
  75     {ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines"},
  76     {ERR_PACK(ERR_LIB_ESS, 0, 0), "ESS routines"},
  77     {ERR_PACK(ERR_LIB_PROV, 0, 0), "Provider routines"},
  78     {ERR_PACK(ERR_LIB_OSSL_SERIALIZER, 0, 0), "SERIALIZER routines"},
  79     {ERR_PACK(ERR_LIB_OSSL_DESERIALIZER, 0, 0), "DESERIALIZER routines"},
  80     {ERR_PACK(ERR_LIB_HTTP, 0, 0), "HTTP routines"},
  81     {0, NULL},
  82 };
  83
  84 static ERR_STRING_DATA ERR_str_reasons[] = {
  85     {ERR_R_SYS_LIB, "system lib"},
  86     {ERR_R_BN_LIB, "BN lib"},
  87     {ERR_R_RSA_LIB, "RSA lib"},
  88     {ERR_R_DH_LIB, "DH lib"},
  89     {ERR_R_EVP_LIB, "EVP lib"},
  90     {ERR_R_BUF_LIB, "BUF lib"},
  91     {ERR_R_OBJ_LIB, "OBJ lib"},
  92     {ERR_R_PEM_LIB, "PEM lib"},
  93     {ERR_R_DSA_LIB, "DSA lib"},
  94     {ERR_R_X509_LIB, "X509 lib"},
  95     {ERR_R_ASN1_LIB, "ASN1 lib"},
  96     {ERR_R_EC_LIB, "EC lib"},
  97     {ERR_R_BIO_LIB, "BIO lib"},
  98     {ERR_R_PKCS7_LIB, "PKCS7 lib"},
  99     {ERR_R_X509V3_LIB, "X509V3 lib"},
 100     {ERR_R_ENGINE_LIB, "ENGINE lib"},
 101     {ERR_R_UI_LIB, "UI lib"},
 102     {ERR_R_OSSL_STORE_LIB, "STORE lib"},
 103     {ERR_R_ECDSA_LIB, "ECDSA lib"},
 104
 105     {ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
 106     {ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
 107
 108     {ERR_R_FATAL, "fatal"},
 109     {ERR_R_MALLOC_FAILURE, "malloc failure"},
 110     {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
 111      "called a function you should not call"},
 112     {ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
 113     {ERR_R_INTERNAL_ERROR, "internal error"},
 114     {ERR_R_DISABLED, "called a function that was disabled at compile-time"},
 115     {ERR_R_INIT_FAIL, "init fail"},
 116     {ERR_R_OPERATION_FAIL, "operation fail"},
 117     {ERR_R_INVALID_PROVIDER_FUNCTIONS, "invalid provider functions"},
 118     {ERR_R_INTERRUPTED_OR_CANCELLED, "interrupted or cancelled"},
 119
 120     {0, NULL},
 121 };
 122 #endif
 123
 124 static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
 125 static int set_err_thread_local;
 126 static CRYPTO_THREAD_LOCAL err_thread_local;
 127
 128 static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
 129 static CRYPTO_RWLOCK *err_string_lock;
 130
 131 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
 132
 133 /*
 134  * The internal state
 135  */
 136
 137 static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
 138 static int int_err_library_number = ERR_LIB_USER;
 139
 140 typedef enum ERR_GET_ACTION_e {
 141     EV_POP, EV_PEEK, EV_PEEK_LAST
 142 } ERR_GET_ACTION;
 143
 144 static unsigned long get_error_values(ERR_GET_ACTION g,
 145                                       const char **file, int *line,
 146                                       const char **func, const char **data,
 147                                       int *flags);
 148
 149 static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
 150 {
 151     unsigned long ret, l;
 152
 153     l = a->error;
 154     ret = l ^ ERR_GET_LIB(l);
 155     return (ret ^ ret % 19 * 13);
 156 }
 157
 158 static int err_string_data_cmp(const ERR_STRING_DATA *a,
 159                                const ERR_STRING_DATA *b)
 160 {
 161     if (a->error == b->error)
 162         return 0;
 163     return a->error > b->error ? 1 : -1;
 164 }
 165
 166 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
 167 {
 168     ERR_STRING_DATA *p = NULL;
 169
 170     CRYPTO_THREAD_read_lock(err_string_lock);
 171     p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
 172     CRYPTO_THREAD_unlock(err_string_lock);
 173
 174     return p;
 175 }
 176
 177 static void ERR_STATE_free(ERR_STATE *s)
 178 {
 179     int i;
 180
 181     if (s == NULL)
 182         return;
 183     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 184         err_clear_data(s, i, 1);
 185     }
 186     OPENSSL_free(s);
 187 }
 188
 189 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
 190 {
 191     if (!OPENSSL_init_crypto(0, NULL))
 192         return 0;
 193     err_string_lock = CRYPTO_THREAD_lock_new();
 194     if (err_string_lock == NULL)
 195         return 0;
 196     int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
 197                                             err_string_data_cmp);
 198     if (int_error_hash == NULL) {
 199         CRYPTO_THREAD_lock_free(err_string_lock);
 200         err_string_lock = NULL;
 201         return 0;
 202     }
 203     return 1;
 204 }
 205
 206 void err_cleanup(void)
 207 {
 208     if (set_err_thread_local != 0)
 209         CRYPTO_THREAD_cleanup_local(&err_thread_local);
 210     CRYPTO_THREAD_lock_free(err_string_lock);
 211     err_string_lock = NULL;
 212     lh_ERR_STRING_DATA_free(int_error_hash);
 213     int_error_hash = NULL;
 214 }
 215
 216 /*
 217  * Legacy; pack in the library.
 218  */
 219 static void err_patch(int lib, ERR_STRING_DATA *str)
 220 {
 221     unsigned long plib = ERR_PACK(lib, 0, 0);
 222
 223     for (; str->error != 0; str++)
 224         str->error |= plib;
 225 }
 226
 227 /*
 228  * Hash in |str| error strings. Assumes the URN_ONCE was done.
 229  */
 230 static int err_load_strings(const ERR_STRING_DATA *str)
 231 {
 232     CRYPTO_THREAD_write_lock(err_string_lock);
 233     for (; str->error; str++)
 234         (void)lh_ERR_STRING_DATA_insert(int_error_hash,
 235                                        (ERR_STRING_DATA *)str);
 236     CRYPTO_THREAD_unlock(err_string_lock);
 237     return 1;
 238 }
 239
 240 int ERR_load_ERR_strings(void)
 241 {
 242 #ifndef OPENSSL_NO_ERR
 243     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 244         return 0;
 245
 246     err_load_strings(ERR_str_libraries);
 247     err_load_strings(ERR_str_reasons);
 248 #endif
 249     return 1;
 250 }
 251
 252 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
 253 {
 254     if (ERR_load_ERR_strings() == 0)
 255         return 0;
 256
 257     err_patch(lib, str);
 258     err_load_strings(str);
 259     return 1;
 260 }
 261
 262 int ERR_load_strings_const(const ERR_STRING_DATA *str)
 263 {
 264     if (ERR_load_ERR_strings() == 0)
 265         return 0;
 266     err_load_strings(str);
 267     return 1;
 268 }
 269
 270 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
 271 {
 272     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 273         return 0;
 274
 275     CRYPTO_THREAD_write_lock(err_string_lock);
 276     /*
 277      * We don't need to ERR_PACK the lib, since that was done (to
 278      * the table) when it was loaded.
 279      */
 280     for (; str->error; str++)
 281         (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
 282     CRYPTO_THREAD_unlock(err_string_lock);
 283
 284     return 1;
 285 }
 286
 287 void err_free_strings_int(void)
 288 {
 289     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 290         return;
 291 }
 292
 293 /********************************************************/
 294
 295 void ERR_clear_error(void)
 296 {
 297     int i;
 298     ERR_STATE *es;
 299
 300     es = err_get_state_int();
 301     if (es == NULL)
 302         return;
 303
 304     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 305         err_clear(es, i, 0);
 306     }
 307     es->top = es->bottom = 0;
 308 }
 309
 310 unsigned long ERR_get_error(void)
 311 {
 312     return get_error_values(EV_POP, NULL, NULL, NULL, NULL, NULL);
 313 }
 314
 315 unsigned long ERR_get_error_line(const char **file, int *line)
 316 {
 317     return get_error_values(EV_POP, file, line, NULL, NULL, NULL);
 318 }
 319
 320 unsigned long ERR_get_error_func(const char **func)
 321 {
 322     return get_error_values(EV_POP, NULL, NULL, func, NULL, NULL);
 323 }
 324
 325 unsigned long ERR_get_error_data(const char **data, int *flags)
 326 {
 327     return get_error_values(EV_POP, NULL, NULL, NULL, data, flags);
 328 }
 329
 330 unsigned long ERR_get_error_all(const char **file, int *line,
 331                                 const char **func,
 332                                 const char **data, int *flags)
 333 {
 334     return get_error_values(EV_POP, file, line, func, data, flags);
 335 }
 336
 337 #ifndef OPENSSL_NO_DEPRECATED_3_0
 338 unsigned long ERR_get_error_line_data(const char **file, int *line,
 339                                       const char **data, int *flags)
 340 {
 341     return get_error_values(EV_POP, file, line, NULL, data, flags);
 342 }
 343 #endif
 344
 345 unsigned long ERR_peek_error(void)
 346 {
 347     return get_error_values(EV_PEEK, NULL, NULL, NULL, NULL, NULL);
 348 }
 349
 350 unsigned long ERR_peek_error_line(const char **file, int *line)
 351 {
 352     return get_error_values(EV_PEEK, file, line, NULL, NULL, NULL);
 353 }
 354
 355 unsigned long ERR_peek_error_func(const char **func)
 356 {
 357     return get_error_values(EV_PEEK, NULL, NULL, func, NULL, NULL);
 358 }
 359
 360 unsigned long ERR_peek_error_data(const char **data, int *flags)
 361 {
 362     return get_error_values(EV_PEEK, NULL, NULL, NULL, data, flags);
 363 }
 364
 365 unsigned long ERR_peek_error_all(const char **file, int *line,
 366                                  const char **func,
 367                                  const char **data, int *flags)
 368 {
 369     return get_error_values(EV_PEEK, file, line, func, data, flags);
 370 }
 371
 372 #ifndef OPENSSL_NO_DEPRECATED_3_0
 373 unsigned long ERR_peek_error_line_data(const char **file, int *line,
 374                                        const char **data, int *flags)
 375 {
 376     return get_error_values(EV_PEEK, file, line, NULL, data, flags);
 377 }
 378 #endif
 379
 380 unsigned long ERR_peek_last_error(void)
 381 {
 382     return get_error_values(EV_PEEK_LAST, NULL, NULL, NULL, NULL, NULL);
 383 }
 384
 385 unsigned long ERR_peek_last_error_line(const char **file, int *line)
 386 {
 387     return get_error_values(EV_PEEK_LAST, file, line, NULL, NULL, NULL);
 388 }
 389
 390 unsigned long ERR_peek_last_error_func(const char **func)
 391 {
 392     return get_error_values(EV_PEEK_LAST, NULL, NULL, func, NULL, NULL);
 393 }
 394
 395 unsigned long ERR_peek_last_error_data(const char **data, int *flags)
 396 {
 397     return get_error_values(EV_PEEK_LAST, NULL, NULL, NULL, data, flags);
 398 }
 399
 400 unsigned long ERR_peek_last_error_all(const char **file, int *line,
 401                                       const char **func,
 402                                       const char **data, int *flags)
 403 {
 404     return get_error_values(EV_PEEK_LAST, file, line, func, data, flags);
 405 }
 406
 407 #ifndef OPENSSL_NO_DEPRECATED_3_0
 408 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
 409                                             const char **data, int *flags)
 410 {
 411     return get_error_values(EV_PEEK_LAST, file, line, NULL, data, flags);
 412 }
 413 #endif
 414
 415 static unsigned long get_error_values(ERR_GET_ACTION g,
 416                                       const char **file, int *line,
 417                                       const char **func,
 418                                       const char **data, int *flags)
 419 {
 420     int i = 0;
 421     ERR_STATE *es;
 422     unsigned long ret;
 423
 424     es = err_get_state_int();
 425     if (es == NULL)
 426         return 0;
 427
 428     /*
 429      * Clear anything that should have been cleared earlier. We do this
 430      * here because this doesn't have constant-time issues.
 431      */
 432     while (es->bottom != es->top) {
 433         if (es->err_flags[es->top] & ERR_FLAG_CLEAR) {
 434             err_clear(es, es->top, 0);
 435             es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
 436             continue;
 437         }
 438         i = (es->bottom + 1) % ERR_NUM_ERRORS;
 439         if (es->err_flags[i] & ERR_FLAG_CLEAR) {
 440             es->bottom = i;
 441             err_clear(es, es->bottom, 0);
 442             continue;
 443         }
 444         break;
 445     }
 446
 447     /* If everything has been cleared, the stack is empty. */
 448     if (es->bottom == es->top)
 449         return 0;
 450
 451     /* Which error, the top of stack (latest one) or the first one? */
 452     if (g == EV_PEEK_LAST)
 453         i = es->top;
 454     else
 455         i = (es->bottom + 1) % ERR_NUM_ERRORS;
 456
 457     ret = es->err_buffer[i];
 458     if (g == EV_POP) {
 459         es->bottom = i;
 460         es->err_buffer[i] = 0;
 461     }
 462
 463     if (file != NULL) {
 464         *file = es->err_file[i];
 465         if (*file == NULL)
 466             *file = "";
 467     }
 468     if (line != NULL)
 469         *line = es->err_line[i];
 470     if (func != NULL) {
 471         *func = es->err_func[i];
 472         if (*func == NULL)
 473             *func = "";
 474     }
 475     if (flags != NULL)
 476         *flags = es->err_data_flags[i];
 477     if (data == NULL) {
 478         if (g == EV_POP) {
 479             err_clear_data(es, i, 0);
 480         }
 481     } else {
 482         *data = es->err_data[i];
 483         if (*data == NULL) {
 484             *data = "";
 485             if (flags != NULL)
 486                 *flags = 0;
 487         }
 488     }
 489     return ret;
 490 }
 491
 492 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
 493 {
 494     char lsbuf[64], rsbuf[256];
 495     const char *ls, *rs = NULL;
 496     unsigned long f = 0, l, r;
 497
 498     if (len == 0)
 499         return;
 500
 501     l = ERR_GET_LIB(e);
 502     ls = ERR_lib_error_string(e);
 503     if (ls == NULL) {
 504         BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
 505         ls = lsbuf;
 506     }
 507
 508     /*
 509      * ERR_reason_error_string() can't safely return system error strings,
 510      * since it would call openssl_strerror_r(), which needs a buffer for
 511      * thread safety.  So for system errors, we call openssl_strerror_r()
 512      * directly instead.
 513      */
 514     r = ERR_GET_REASON(e);
 515     if (ERR_SYSTEM_ERROR(e)) {
 516         if (openssl_strerror_r(r, rsbuf, sizeof(rsbuf)))
 517             rs = rsbuf;
 518     } else {
 519         rs = ERR_reason_error_string(e);
 520     }
 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 #ifndef OPENSSL_NO_DEPRECATED_3_0
 563 const char *ERR_func_error_string(unsigned long e)
 564 {
 565     return NULL;
 566 }
 567 #endif
 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     /*
 579      * ERR_reason_error_string() can't safely return system error strings,
 580      * since openssl_strerror_r() needs a buffer for thread safety, and we
 581      * haven't got one that would serve any sensible purpose.
 582      */
 583     if (ERR_SYSTEM_ERROR(e))
 584         return NULL;
 585
 586     l = ERR_GET_LIB(e);
 587     r = ERR_GET_REASON(e);
 588     d.error = ERR_PACK(l, 0, r);
 589     p = int_err_get_item(&d);
 590     if (p == NULL) {
 591         d.error = ERR_PACK(0, 0, r);
 592         p = int_err_get_item(&d);
 593     }
 594     return ((p == NULL) ? NULL : p->string);
 595 }
 596
 597 /* TODO(3.0): arg ignored for now */
 598 static void err_delete_thread_state(void *arg)
 599 {
 600     ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
 601     if (state == NULL)
 602         return;
 603
 604     CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 605     ERR_STATE_free(state);
 606 }
 607
 608 #ifndef OPENSSL_NO_DEPRECATED_1_1_0
 609 void ERR_remove_thread_state(void *dummy)
 610 {
 611 }
 612 #endif
 613
 614 #ifndef OPENSSL_NO_DEPRECATED_1_0_0
 615 void ERR_remove_state(unsigned long pid)
 616 {
 617 }
 618 #endif
 619
 620 DEFINE_RUN_ONCE_STATIC(err_do_init)
 621 {
 622     set_err_thread_local = 1;
 623     return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
 624 }
 625
 626 ERR_STATE *err_get_state_int(void)
 627 {
 628     ERR_STATE *state;
 629     int saveerrno = get_last_sys_error();
 630
 631     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 632         return NULL;
 633
 634     if (!RUN_ONCE(&err_init, err_do_init))
 635         return NULL;
 636
 637     state = CRYPTO_THREAD_get_local(&err_thread_local);
 638     if (state == (ERR_STATE*)-1)
 639         return NULL;
 640
 641     if (state == NULL) {
 642         if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 643             return NULL;
 644
 645         if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
 646             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 647             return NULL;
 648         }
 649
 650         if (!ossl_init_thread_start(NULL, NULL, err_delete_thread_state)
 651                 || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
 652             ERR_STATE_free(state);
 653             CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 654             return NULL;
 655         }
 656
 657         /* Ignore failures from these */
 658         OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 659     }
 660
 661     set_sys_error(saveerrno);
 662     return state;
 663 }
 664
 665 #ifndef OPENSSL_NO_DEPRECATED_3_0
 666 ERR_STATE *ERR_get_state(void)
 667 {
 668     return err_get_state_int();
 669 }
 670 #endif
 671
 672
 673 /*
 674  * err_shelve_state returns the current thread local error state
 675  * and freezes the error module until err_unshelve_state is called.
 676  */
 677 int err_shelve_state(void **state)
 678 {
 679     int saveerrno = get_last_sys_error();
 680
 681     /*
 682      * Note, at present our only caller is OPENSSL_init_crypto(), indirectly
 683      * via ossl_init_load_crypto_nodelete(), by which point the requested
 684      * "base" initialization has already been performed, so the below call is a
 685      * NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
 686      *
 687      * If are no other valid callers of this function, the call below can be
 688      * removed, avoiding the re-entry into OPENSSL_init_crypto().  If there are
 689      * potential uses that are not from inside OPENSSL_init_crypto(), then this
 690      * call is needed, but some care is required to make sure that the re-entry
 691      * remains a NOOP.
 692      */
 693     if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
 694         return 0;
 695
 696     if (!RUN_ONCE(&err_init, err_do_init))
 697         return 0;
 698
 699     *state = CRYPTO_THREAD_get_local(&err_thread_local);
 700     if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
 701         return 0;
 702
 703     set_sys_error(saveerrno);
 704     return 1;
 705 }
 706
 707 /*
 708  * err_unshelve_state restores the error state that was returned
 709  * by err_shelve_state previously.
 710  */
 711 void err_unshelve_state(void* state)
 712 {
 713     if (state != (void*)-1)
 714         CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
 715 }
 716
 717 int ERR_get_next_error_library(void)
 718 {
 719     int ret;
 720
 721     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 722         return 0;
 723
 724     CRYPTO_THREAD_write_lock(err_string_lock);
 725     ret = int_err_library_number++;
 726     CRYPTO_THREAD_unlock(err_string_lock);
 727     return ret;
 728 }
 729
 730 static int err_set_error_data_int(char *data, size_t size, int flags,
 731                                   int deallocate)
 732 {
 733     ERR_STATE *es;
 734
 735     es = err_get_state_int();
 736     if (es == NULL)
 737         return 0;
 738
 739     err_clear_data(es, es->top, deallocate);
 740     err_set_data(es, es->top, data, size, flags);
 741
 742     return 1;
 743 }
 744
 745 void ERR_set_error_data(char *data, int flags)
 746 {
 747     /*
 748      * This function is void so we cannot propagate the error return. Since it
 749      * is also in the public API we can't change the return type.
 750      *
 751      * We estimate the size of the data.  If it's not flagged as allocated,
 752      * then this is safe, and if it is flagged as allocated, then our size
 753      * may be smaller than the actual allocation, but that doesn't matter
 754      * too much, the buffer will remain untouched or will eventually be
 755      * reallocated to a new size.
 756      *
 757      * callers should be advised that this function takes over ownership of
 758      * the allocated memory, i.e. they can't count on the pointer to remain
 759      * valid.
 760      */
 761     err_set_error_data_int(data, strlen(data) + 1, flags, 1);
 762 }
 763
 764 void ERR_add_error_data(int num, ...)
 765 {
 766     va_list args;
 767     va_start(args, num);
 768     ERR_add_error_vdata(num, args);
 769     va_end(args);
 770 }
 771
 772 void ERR_add_error_vdata(int num, va_list args)
 773 {
 774     int i, len, size;
 775     int flags = ERR_TXT_MALLOCED | ERR_TXT_STRING;
 776     char *str, *arg;
 777     ERR_STATE *es;
 778
 779     /* Get the current error data; if an allocated string get it. */
 780     es = err_get_state_int();
 781     if (es == NULL)
 782         return;
 783     i = es->top;
 784
 785     /*
 786      * If err_data is allocated already, re-use the space.
 787      * Otherwise, allocate a small new buffer.
 788      */
 789     if ((es->err_data_flags[i] & flags) == flags) {
 790         str = es->err_data[i];
 791         size = es->err_data_size[i];
 792
 793         /*
 794          * To protect the string we just grabbed from tampering by other
 795          * functions we may call, or to protect them from freeing a pointer
 796          * that may no longer be valid at that point, we clear away the
 797          * data pointer and the flags.  We will set them again at the end
 798          * of this function.
 799          */
 800         es->err_data[i] = NULL;
 801         es->err_data_flags[i] = 0;
 802     } else if ((str = OPENSSL_malloc(size = 81)) == NULL) {
 803         return;
 804     } else {
 805         str[0] = '\0';
 806     }
 807     len = strlen(str);
 808
 809     while (--num >= 0) {
 810         arg = va_arg(args, char *);
 811         if (arg == NULL)
 812             arg = "<NULL>";
 813         len += strlen(arg);
 814         if (len >= size) {
 815             char *p;
 816
 817             size = len + 20;
 818             p = OPENSSL_realloc(str, size);
 819             if (p == NULL) {
 820                 OPENSSL_free(str);
 821                 return;
 822             }
 823             str = p;
 824         }
 825         OPENSSL_strlcat(str, arg, (size_t)size);
 826     }
 827     if (!err_set_error_data_int(str, size, flags, 0))
 828         OPENSSL_free(str);
 829 }
 830
 831 int ERR_set_mark(void)
 832 {
 833     ERR_STATE *es;
 834
 835     es = err_get_state_int();
 836     if (es == NULL)
 837         return 0;
 838
 839     if (es->bottom == es->top)
 840         return 0;
 841     es->err_flags[es->top] |= ERR_FLAG_MARK;
 842     return 1;
 843 }
 844
 845 int ERR_pop_to_mark(void)
 846 {
 847     ERR_STATE *es;
 848
 849     es = err_get_state_int();
 850     if (es == NULL)
 851         return 0;
 852
 853     while (es->bottom != es->top
 854            && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
 855         err_clear(es, es->top, 0);
 856         es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
 857     }
 858
 859     if (es->bottom == es->top)
 860         return 0;
 861     es->err_flags[es->top] &= ~ERR_FLAG_MARK;
 862     return 1;
 863 }
 864
 865 int ERR_clear_last_mark(void)
 866 {
 867     ERR_STATE *es;
 868     int top;
 869
 870     es = err_get_state_int();
 871     if (es == NULL)
 872         return 0;
 873
 874     top = es->top;
 875     while (es->bottom != top
 876            && (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
 877         top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
 878     }
 879
 880     if (es->bottom == top)
 881         return 0;
 882     es->err_flags[top] &= ~ERR_FLAG_MARK;
 883     return 1;
 884 }
 885
 886 void err_clear_last_constant_time(int clear)
 887 {
 888     ERR_STATE *es;
 889     int top;
 890
 891     es = err_get_state_int();
 892     if (es == NULL)
 893         return;
 894
 895     top = es->top;
 896
 897     /*
 898      * Flag error as cleared but remove it elsewhere to avoid two errors
 899      * accessing the same error stack location, revealing timing information.
 900      */
 901     clear = constant_time_select_int(constant_time_eq_int(clear, 0),
 902                                      0, ERR_FLAG_CLEAR);
 903     es->err_flags[top] |= clear;
 904 }