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openssl/crypto/err/err.c
Richard Levitte 189dbdd994 ERR: fix err_data_size inconsistencies 
In ERR_add_error_vdata(), the size of err_data had 1 added to it in
some spots, which could lead to buffer overflow.

In ERR_vset_error(), ERR_MAX_DATA_SIZE was used instead of buf_size in
the BIO_vsnprintf() call, which would lead to a buffer overflow if
such a large buffer couldn't be allocated.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9491)
2019-07-31 13:22:13 +02:00

888 lines
24 KiB
C
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/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include "internal/cryptlib_int.h"
#include "internal/err.h"
#include "internal/err_int.h"
#include <openssl/err.h>
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include <openssl/bio.h>
#include <openssl/opensslconf.h>
#include "internal/thread_once.h"
#include "internal/ctype.h"
#include "internal/constant_time_locl.h"
#include "e_os.h"
#include "err_locl.h"
static int err_load_strings(const ERR_STRING_DATA *str);
static void ERR_STATE_free(ERR_STATE *s);
#ifndef OPENSSL_NO_ERR
static ERR_STRING_DATA ERR_str_libraries[] = {
{ERR_PACK(ERR_LIB_NONE, 0, 0), "unknown library"},
{ERR_PACK(ERR_LIB_SYS, 0, 0), "system library"},
{ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines"},
{ERR_PACK(ERR_LIB_RSA, 0, 0), "rsa routines"},
{ERR_PACK(ERR_LIB_DH, 0, 0), "Diffie-Hellman routines"},
{ERR_PACK(ERR_LIB_EVP, 0, 0), "digital envelope routines"},
{ERR_PACK(ERR_LIB_BUF, 0, 0), "memory buffer routines"},
{ERR_PACK(ERR_LIB_OBJ, 0, 0), "object identifier routines"},
{ERR_PACK(ERR_LIB_PEM, 0, 0), "PEM routines"},
{ERR_PACK(ERR_LIB_DSA, 0, 0), "dsa routines"},
{ERR_PACK(ERR_LIB_X509, 0, 0), "x509 certificate routines"},
{ERR_PACK(ERR_LIB_ASN1, 0, 0), "asn1 encoding routines"},
{ERR_PACK(ERR_LIB_CONF, 0, 0), "configuration file routines"},
{ERR_PACK(ERR_LIB_CRYPTO, 0, 0), "common libcrypto routines"},
{ERR_PACK(ERR_LIB_EC, 0, 0), "elliptic curve routines"},
{ERR_PACK(ERR_LIB_ECDSA, 0, 0), "ECDSA routines"},
{ERR_PACK(ERR_LIB_ECDH, 0, 0), "ECDH routines"},
{ERR_PACK(ERR_LIB_SSL, 0, 0), "SSL routines"},
{ERR_PACK(ERR_LIB_BIO, 0, 0), "BIO routines"},
{ERR_PACK(ERR_LIB_PKCS7, 0, 0), "PKCS7 routines"},
{ERR_PACK(ERR_LIB_X509V3, 0, 0), "X509 V3 routines"},
{ERR_PACK(ERR_LIB_PKCS12, 0, 0), "PKCS12 routines"},
{ERR_PACK(ERR_LIB_RAND, 0, 0), "random number generator"},
{ERR_PACK(ERR_LIB_DSO, 0, 0), "DSO support routines"},
{ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines"},
{ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines"},
{ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines"},
{ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines"},
{ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines"},
{ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines"},
{ERR_PACK(ERR_LIB_CRMF, 0, 0), "CRMF routines"},
{ERR_PACK(ERR_LIB_CMP, 0, 0), "CMP routines"},
{ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines"},
{ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines"},
{ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC routines"},
{ERR_PACK(ERR_LIB_KDF, 0, 0), "KDF routines"},
{ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines"},
{ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines"},
{ERR_PACK(ERR_LIB_ESS, 0, 0), "ESS routines"},
{ERR_PACK(ERR_LIB_PROV, 0, 0), "Provider routines"},
{0, NULL},
};
static ERR_STRING_DATA ERR_str_reasons[] = {
{ERR_R_SYS_LIB, "system lib"},
{ERR_R_BN_LIB, "BN lib"},
{ERR_R_RSA_LIB, "RSA lib"},
{ERR_R_DH_LIB, "DH lib"},
{ERR_R_EVP_LIB, "EVP lib"},
{ERR_R_BUF_LIB, "BUF lib"},
{ERR_R_OBJ_LIB, "OBJ lib"},
{ERR_R_PEM_LIB, "PEM lib"},
{ERR_R_DSA_LIB, "DSA lib"},
{ERR_R_X509_LIB, "X509 lib"},
{ERR_R_ASN1_LIB, "ASN1 lib"},
{ERR_R_EC_LIB, "EC lib"},
{ERR_R_BIO_LIB, "BIO lib"},
{ERR_R_PKCS7_LIB, "PKCS7 lib"},
{ERR_R_X509V3_LIB, "X509V3 lib"},
{ERR_R_ENGINE_LIB, "ENGINE lib"},
{ERR_R_UI_LIB, "UI lib"},
{ERR_R_OSSL_STORE_LIB, "STORE lib"},
{ERR_R_ECDSA_LIB, "ECDSA lib"},
{ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
{ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
{ERR_R_FATAL, "fatal"},
{ERR_R_MALLOC_FAILURE, "malloc failure"},
{ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
"called a function you should not call"},
{ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
{ERR_R_INTERNAL_ERROR, "internal error"},
{ERR_R_DISABLED, "called a function that was disabled at compile-time"},
{ERR_R_INIT_FAIL, "init fail"},
{ERR_R_OPERATION_FAIL, "operation fail"},
{0, NULL},
};
#endif
static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
static int set_err_thread_local;
static CRYPTO_THREAD_LOCAL err_thread_local;
static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
static CRYPTO_RWLOCK *err_string_lock;
static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
/*
* The internal state
*/
static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
static int int_err_library_number = ERR_LIB_USER;
static unsigned long get_error_values(int inc, int top, const char **file,
int *line, const char **data,
int *flags);
static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
{
unsigned long ret, l;
l = a->error;
ret = l ^ ERR_GET_LIB(l);
return (ret ^ ret % 19 * 13);
}
static int err_string_data_cmp(const ERR_STRING_DATA *a,
const ERR_STRING_DATA *b)
{
if (a->error == b->error)
return 0;
return a->error > b->error ? 1 : -1;
}
static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
{
ERR_STRING_DATA *p = NULL;
CRYPTO_THREAD_read_lock(err_string_lock);
p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
CRYPTO_THREAD_unlock(err_string_lock);
return p;
}
#ifndef OPENSSL_NO_ERR
/* 2019-05-21: Russian and Ukrainian locales on Linux require more than 6,5 kB */
# define SPACE_SYS_STR_REASONS 8 * 1024
# define NUM_SYS_STR_REASONS 127
static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
/*
* SYS_str_reasons is filled with copies of strerror() results at
* initialization. 'errno' values up to 127 should cover all usual errors,
* others will be displayed numerically by ERR_error_string. It is crucial
* that we have something for each reason code that occurs in
* ERR_str_reasons, or bogus reason strings will be returned for SYSerr(),
* which always gets an errno value and never one of those 'standard' reason
* codes.
*/
static void build_SYS_str_reasons(void)
{
/* OPENSSL_malloc cannot be used here, use static storage instead */
static char strerror_pool[SPACE_SYS_STR_REASONS];
char *cur = strerror_pool;
size_t cnt = 0;
static int init = 1;
int i;
int saveerrno = get_last_sys_error();
CRYPTO_THREAD_write_lock(err_string_lock);
if (!init) {
CRYPTO_THREAD_unlock(err_string_lock);
return;
}
for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
str->error = ERR_PACK(ERR_LIB_SYS, 0, i);
/*
* If we have used up all the space in strerror_pool,
* there's no point in calling openssl_strerror_r()
*/
if (str->string == NULL && cnt < sizeof(strerror_pool)) {
if (openssl_strerror_r(i, cur, sizeof(strerror_pool) - cnt)) {
size_t l = strlen(cur);
str->string = cur;
cnt += l;
cur += l;
/*
* VMS has an unusual quirk of adding spaces at the end of
* some (most? all?) messages. Lets trim them off.
*/
while (cur > strerror_pool && ossl_isspace(cur[-1])) {
cur--;
cnt--;
}
*cur++ = '\0';
cnt++;
}
}
if (str->string == NULL)
str->string = "unknown";
}
/*
* Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL}, as
* required by ERR_load_strings.
*/
init = 0;
CRYPTO_THREAD_unlock(err_string_lock);
/* openssl_strerror_r could change errno, but we want to preserve it */
set_sys_error(saveerrno);
err_load_strings(SYS_str_reasons);
}
#endif
static void ERR_STATE_free(ERR_STATE *s)
{
int i;
if (s == NULL)
return;
for (i = 0; i < ERR_NUM_ERRORS; i++) {
err_clear_data(s, i, 1);
}
OPENSSL_free(s);
}
DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
{
if (!OPENSSL_init_crypto(0, NULL))
return 0;
err_string_lock = CRYPTO_THREAD_lock_new();
if (err_string_lock == NULL)
return 0;
int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
err_string_data_cmp);
if (int_error_hash == NULL) {
CRYPTO_THREAD_lock_free(err_string_lock);
err_string_lock = NULL;
return 0;
}
return 1;
}
void err_cleanup(void)
{
if (set_err_thread_local != 0)
CRYPTO_THREAD_cleanup_local(&err_thread_local);
CRYPTO_THREAD_lock_free(err_string_lock);
err_string_lock = NULL;
lh_ERR_STRING_DATA_free(int_error_hash);
int_error_hash = NULL;
}
/*
* Legacy; pack in the library.
*/
static void err_patch(int lib, ERR_STRING_DATA *str)
{
unsigned long plib = ERR_PACK(lib, 0, 0);
for (; str->error != 0; str++)
str->error |= plib;
}
/*
* Hash in |str| error strings. Assumes the URN_ONCE was done.
*/
static int err_load_strings(const ERR_STRING_DATA *str)
{
CRYPTO_THREAD_write_lock(err_string_lock);
for (; str->error; str++)
(void)lh_ERR_STRING_DATA_insert(int_error_hash,
(ERR_STRING_DATA *)str);
CRYPTO_THREAD_unlock(err_string_lock);
return 1;
}
int ERR_load_ERR_strings(void)
{
#ifndef OPENSSL_NO_ERR
if (!RUN_ONCE(&err_string_init, do_err_strings_init))
return 0;
err_load_strings(ERR_str_libraries);
err_load_strings(ERR_str_reasons);
build_SYS_str_reasons();
#endif
return 1;
}
int ERR_load_strings(int lib, ERR_STRING_DATA *str)
{
if (ERR_load_ERR_strings() == 0)
return 0;
err_patch(lib, str);
err_load_strings(str);
return 1;
}
int ERR_load_strings_const(const ERR_STRING_DATA *str)
{
if (ERR_load_ERR_strings() == 0)
return 0;
err_load_strings(str);
return 1;
}
int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
{
if (!RUN_ONCE(&err_string_init, do_err_strings_init))
return 0;
CRYPTO_THREAD_write_lock(err_string_lock);
/*
* We don't need to ERR_PACK the lib, since that was done (to
* the table) when it was loaded.
*/
for (; str->error; str++)
(void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
CRYPTO_THREAD_unlock(err_string_lock);
return 1;
}
void err_free_strings_int(void)
{
if (!RUN_ONCE(&err_string_init, do_err_strings_init))
return;
}
/********************************************************/
void ERR_clear_error(void)
{
int i;
ERR_STATE *es;
es = ERR_get_state();
if (es == NULL)
return;
for (i = 0; i < ERR_NUM_ERRORS; i++) {
err_clear(es, i, 0);
}
es->top = es->bottom = 0;
}
unsigned long ERR_get_error(void)
{
return get_error_values(1, 0, NULL, NULL, NULL, NULL);
}
unsigned long ERR_get_error_line(const char **file, int *line)
{
return get_error_values(1, 0, file, line, NULL, NULL);
}
unsigned long ERR_get_error_line_data(const char **file, int *line,
const char **data, int *flags)
{
return get_error_values(1, 0, file, line, data, flags);
}
unsigned long ERR_peek_error(void)
{
return get_error_values(0, 0, NULL, NULL, NULL, NULL);
}
unsigned long ERR_peek_error_line(const char **file, int *line)
{
return get_error_values(0, 0, file, line, NULL, NULL);
}
unsigned long ERR_peek_error_line_data(const char **file, int *line,
const char **data, int *flags)
{
return get_error_values(0, 0, file, line, data, flags);
}
unsigned long ERR_peek_last_error(void)
{
return get_error_values(0, 1, NULL, NULL, NULL, NULL);
}
unsigned long ERR_peek_last_error_line(const char **file, int *line)
{
return get_error_values(0, 1, file, line, NULL, NULL);
}
unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
const char **data, int *flags)
{
return get_error_values(0, 1, file, line, data, flags);
}
static unsigned long get_error_values(int inc, int top, const char **file,
int *line, const char **data,
int *flags)
{
int i = 0;
ERR_STATE *es;
unsigned long ret;
es = ERR_get_state();
if (es == NULL)
return 0;
if (inc && top) {
if (file)
*file = "";
if (line)
*line = 0;
if (data)
*data = "";
if (flags)
*flags = 0;
return ERR_R_INTERNAL_ERROR;
}
while (es->bottom != es->top) {
if (es->err_flags[es->top] & ERR_FLAG_CLEAR) {
err_clear(es, es->top, 0);
es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
continue;
}
i = (es->bottom + 1) % ERR_NUM_ERRORS;
if (es->err_flags[i] & ERR_FLAG_CLEAR) {
es->bottom = i;
err_clear(es, es->bottom, 0);
continue;
}
break;
}
if (es->bottom == es->top)
return 0;
if (top)
i = es->top; /* last error */
else
i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */
ret = es->err_buffer[i];
if (inc) {
es->bottom = i;
es->err_buffer[i] = 0;
}
if (file != NULL && line != NULL) {
if (es->err_file[i] == NULL) {
*file = "NA";
*line = 0;
} else {
*file = es->err_file[i];
*line = es->err_line[i];
}
}
if (data == NULL) {
if (inc) {
err_clear_data(es, i, 0);
}
} else {
if (es->err_data[i] == NULL) {
*data = "";
if (flags != NULL)
*flags = 0;
} else {
*data = es->err_data[i];
if (flags != NULL)
*flags = es->err_data_flags[i];
}
}
return ret;
}
void ERR_error_string_n(unsigned long e, char *buf, size_t len)
{
char lsbuf[64], rsbuf[64];
const char *ls, *rs;
unsigned long f = 0, l, r;
if (len == 0)
return;
l = ERR_GET_LIB(e);
ls = ERR_lib_error_string(e);
if (ls == NULL) {
BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
ls = lsbuf;
}
rs = ERR_reason_error_string(e);
r = ERR_GET_REASON(e);
if (rs == NULL) {
BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
rs = rsbuf;
}
BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, "", rs);
if (strlen(buf) == len - 1) {
/* Didn't fit; use a minimal format. */
BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, f, r);
}
}
/*
* ERR_error_string_n should be used instead for ret != NULL as
* ERR_error_string cannot know how large the buffer is
*/
char *ERR_error_string(unsigned long e, char *ret)
{
static char buf[256];
if (ret == NULL)
ret = buf;
ERR_error_string_n(e, ret, (int)sizeof(buf));
return ret;
}
const char *ERR_lib_error_string(unsigned long e)
{
ERR_STRING_DATA d, *p;
unsigned long l;
if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
return NULL;
}
l = ERR_GET_LIB(e);
d.error = ERR_PACK(l, 0, 0);
p = int_err_get_item(&d);
return ((p == NULL) ? NULL : p->string);
}
const char *ERR_func_error_string(unsigned long e)
{
if (!RUN_ONCE(&err_string_init, do_err_strings_init))
return NULL;
return ERR_GET_LIB(e) == ERR_LIB_SYS ? "system library" : NULL;
}
const char *ERR_reason_error_string(unsigned long e)
{
ERR_STRING_DATA d, *p = NULL;
unsigned long l, r;
if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
return NULL;
}
l = ERR_GET_LIB(e);
r = ERR_GET_REASON(e);
d.error = ERR_PACK(l, 0, r);
p = int_err_get_item(&d);
if (!p) {
d.error = ERR_PACK(0, 0, r);
p = int_err_get_item(&d);
}
return ((p == NULL) ? NULL : p->string);
}
/* TODO(3.0): arg ignored for now */
static void err_delete_thread_state(void *arg)
{
ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
if (state == NULL)
return;
CRYPTO_THREAD_set_local(&err_thread_local, NULL);
ERR_STATE_free(state);
}
#if !OPENSSL_API_1_1_0
void ERR_remove_thread_state(void *dummy)
{
}
#endif
#if !OPENSSL_API_1_0_0
void ERR_remove_state(unsigned long pid)
{
}
#endif
DEFINE_RUN_ONCE_STATIC(err_do_init)
{
set_err_thread_local = 1;
return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
}
ERR_STATE *ERR_get_state(void)
{
ERR_STATE *state;
int saveerrno = get_last_sys_error();
if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
return NULL;
if (!RUN_ONCE(&err_init, err_do_init))
return NULL;
state = CRYPTO_THREAD_get_local(&err_thread_local);
if (state == (ERR_STATE*)-1)
return NULL;
if (state == NULL) {
if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
return NULL;
if ((state = OPENSSL_zalloc(sizeof(*state))) == NULL) {
CRYPTO_THREAD_set_local(&err_thread_local, NULL);
return NULL;
}
if (!ossl_init_thread_start(NULL, NULL, err_delete_thread_state)
|| !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
ERR_STATE_free(state);
CRYPTO_THREAD_set_local(&err_thread_local, NULL);
return NULL;
}
/* Ignore failures from these */
OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
}
set_sys_error(saveerrno);
return state;
}
/*
* err_shelve_state returns the current thread local error state
* and freezes the error module until err_unshelve_state is called.
*/
int err_shelve_state(void **state)
{
int saveerrno = get_last_sys_error();
/*
* Note, at present our only caller is OPENSSL_init_crypto(), indirectly
* via ossl_init_load_crypto_nodelete(), by which point the requested
* "base" initialization has already been performed, so the below call is a
* NOOP, that re-enters OPENSSL_init_crypto() only to quickly return.
*
* If are no other valid callers of this function, the call below can be
* removed, avoiding the re-entry into OPENSSL_init_crypto(). If there are
* potential uses that are not from inside OPENSSL_init_crypto(), then this
* call is needed, but some care is required to make sure that the re-entry
* remains a NOOP.
*/
if (!OPENSSL_init_crypto(OPENSSL_INIT_BASE_ONLY, NULL))
return 0;
if (!RUN_ONCE(&err_init, err_do_init))
return 0;
*state = CRYPTO_THREAD_get_local(&err_thread_local);
if (!CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)-1))
return 0;
set_sys_error(saveerrno);
return 1;
}
/*
* err_unshelve_state restores the error state that was returned
* by err_shelve_state previously.
*/
void err_unshelve_state(void* state)
{
if (state != (void*)-1)
CRYPTO_THREAD_set_local(&err_thread_local, (ERR_STATE*)state);
}
int ERR_get_next_error_library(void)
{
int ret;
if (!RUN_ONCE(&err_string_init, do_err_strings_init))
return 0;
CRYPTO_THREAD_write_lock(err_string_lock);
ret = int_err_library_number++;
CRYPTO_THREAD_unlock(err_string_lock);
return ret;
}
static int err_set_error_data_int(char *data, size_t size, int flags,
int deallocate)
{
ERR_STATE *es;
es = ERR_get_state();
if (es == NULL)
return 0;
err_clear_data(es, es->top, deallocate);
err_set_data(es, es->top, data, size, flags);
return 1;
}
void ERR_set_error_data(char *data, int flags)
{
/*
* This function is void so we cannot propagate the error return. Since it
* is also in the public API we can't change the return type.
*
* We estimate the size of the data. If it's not flagged as allocated,
* then this is safe, and if it is flagged as allocated, then our size
* may be smaller than the actual allocation, but that doesn't matter
* too much, the buffer will remain untouched or will eventually be
* reallocated to a new size.
*
* callers should be advised that this function takes over ownership of
* the allocated memory, i.e. they can't count on the pointer to remain
* valid.
*/
err_set_error_data_int(data, strlen(data) + 1, flags, 1);
}
void ERR_add_error_data(int num, ...)
{
va_list args;
va_start(args, num);
ERR_add_error_vdata(num, args);
va_end(args);
}
void ERR_add_error_vdata(int num, va_list args)
{
int i, len, size;
int flags = ERR_TXT_MALLOCED | ERR_TXT_STRING;
char *str, *arg;
ERR_STATE *es;
/* Get the current error data; if an allocated string get it. */
es = ERR_get_state();
if (es == NULL)
return;
i = es->top;
/*
* If err_data is allocated already, re-use the space.
* Otherwise, allocate a small new buffer.
*/
if ((es->err_data_flags[i] & flags) == flags) {
str = es->err_data[i];
size = es->err_data_size[i];
/*
* To protect the string we just grabbed from tampering by other
* functions we may call, or to protect them from freeing a pointer
* that may no longer be valid at that point, we clear away the
* data pointer and the flags. We will set them again at the end
* of this function.
*/
es->err_data[i] = NULL;
es->err_data_flags[i] = 0;
} else if ((str = OPENSSL_malloc(size = 81)) == NULL) {
return;
} else {
str[0] = '\0';
}
len = strlen(str);
for (len = 0; --num >= 0; ) {
arg = va_arg(args, char *);
if (arg == NULL)
arg = "<NULL>";
len += strlen(arg);
if (len >= size) {
char *p;
size = len + 20;
p = OPENSSL_realloc(str, size);
if (p == NULL) {
OPENSSL_free(str);
return;
}
str = p;
}
OPENSSL_strlcat(str, arg, (size_t)size);
}
if (!err_set_error_data_int(str, size, flags, 0))
OPENSSL_free(str);
}
int ERR_set_mark(void)
{
ERR_STATE *es;
es = ERR_get_state();
if (es == NULL)
return 0;
if (es->bottom == es->top)
return 0;
es->err_flags[es->top] |= ERR_FLAG_MARK;
return 1;
}
int ERR_pop_to_mark(void)
{
ERR_STATE *es;
es = ERR_get_state();
if (es == NULL)
return 0;
while (es->bottom != es->top
&& (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
err_clear(es, es->top, 0);
es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
}
if (es->bottom == es->top)
return 0;
es->err_flags[es->top] &= ~ERR_FLAG_MARK;
return 1;
}
int ERR_clear_last_mark(void)
{
ERR_STATE *es;
int top;
es = ERR_get_state();
if (es == NULL)
return 0;
top = es->top;
while (es->bottom != top
&& (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
}
if (es->bottom == top)
return 0;
es->err_flags[top] &= ~ERR_FLAG_MARK;
return 1;
}
void err_clear_last_constant_time(int clear)
{
ERR_STATE *es;
int top;
es = ERR_get_state();
if (es == NULL)
return;
top = es->top;
/*
* Flag error as cleared but remove it elsewhere to avoid two errors
* accessing the same error stack location, revealing timing information.
*/
clear = constant_time_select_int(constant_time_eq_int(clear, 0),
0, ERR_FLAG_CLEAR);
es->err_flags[top] |= clear;
}
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