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openssl/crypto/lock.c
David Woodhouse 3ba84717a0 Finish 02f7114a7f 
Reviewed-by: Tim Hudson <tjh@openssl.org>
2016-02-17 17:04:47 -05:00

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/* ====================================================================
* Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
* ECDH support in OpenSSL originally developed by
* SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
*/
#include "internal/cryptlib.h"
#include <openssl/safestack.h>
#if defined(OPENSSL_SYS_WIN32)
static double OpenSSL_MSVC5_hack = 0.0; /* and for VC1.5 */
#endif
/* real #defines in crypto.h, keep these upto date */
static const char *const lock_names[CRYPTO_NUM_LOCKS] = {
"<<ERROR>>",
"err",
"ex_data",
"x509",
"x509_info",
"x509_pkey",
"x509_crl",
"x509_req",
"dsa",
"rsa",
"evp_pkey",
"x509_store",
"ssl_ctx",
"ssl_cert",
"ssl_session",
"ssl_sess_cert",
"ssl",
"ssl_method",
"rand",
"rand2",
"debug_malloc",
"BIO",
"gethostbyname",
"getservbyname",
"readdir",
"RSA_blinding",
"dh",
"debug_malloc2",
"dso",
"dynlock",
"engine",
"ui",
"ecdsa",
"ec",
"ecdh",
"bn",
"ec_pre_comp",
"store",
"comp",
"fips",
"fips2",
"init",
#if CRYPTO_NUM_LOCKS != 42
# error "Inconsistency between crypto.h and cryptlib.c"
#endif
};
/*
* This is for applications to allocate new type names in the non-dynamic
* array of lock names. These are numbered with positive numbers.
*/
static STACK_OF(OPENSSL_STRING) *app_locks = NULL;
/*
* For applications that want a more dynamic way of handling threads, the
* following stack is used. These are externally numbered with negative
* numbers.
*/
static STACK_OF(CRYPTO_dynlock) *dyn_locks = NULL;
static void (*locking_callback) (int mode, int type,
const char *file, int line) = 0;
static int (*add_lock_callback) (int *pointer, int amount,
int type, const char *file, int line) = 0;
static struct CRYPTO_dynlock_value *(*dynlock_create_callback)
(const char *file, int line) = 0;
static void (*dynlock_lock_callback) (int mode,
struct CRYPTO_dynlock_value *l,
const char *file, int line) = 0;
static void (*dynlock_destroy_callback) (struct CRYPTO_dynlock_value *l,
const char *file, int line) = 0;
int CRYPTO_get_new_lockid(char *name)
{
char *str;
int i;
#if defined(OPENSSL_SYS_WIN32)
/*
* A hack to make Visual C++ 5.0 work correctly when linking as a DLL
* using /MT. Without this, the application cannot use any floating point
* printf's. It also seems to be needed for Visual C 1.5 (win16)
*/
OpenSSL_MSVC5_hack = (double)name[0] * (double)name[1];
#endif
if ((app_locks == NULL)
&& ((app_locks = sk_OPENSSL_STRING_new_null()) == NULL)) {
CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID, ERR_R_MALLOC_FAILURE);
return (0);
}
if ((str = OPENSSL_strdup(name)) == NULL) {
CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_LOCKID, ERR_R_MALLOC_FAILURE);
return (0);
}
i = sk_OPENSSL_STRING_push(app_locks, str);
if (!i)
OPENSSL_free(str);
else
i += CRYPTO_NUM_LOCKS; /* gap of one :-) */
return (i);
}
int CRYPTO_num_locks(void)
{
return CRYPTO_NUM_LOCKS;
}
int CRYPTO_get_new_dynlockid(void)
{
int i = 0;
CRYPTO_dynlock *pointer = NULL;
if (dynlock_create_callback == NULL) {
CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID,
CRYPTO_R_NO_DYNLOCK_CREATE_CALLBACK);
return (0);
}
CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
if ((dyn_locks == NULL)
&& ((dyn_locks = sk_CRYPTO_dynlock_new_null()) == NULL)) {
CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID, ERR_R_MALLOC_FAILURE);
return (0);
}
CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
pointer = OPENSSL_malloc(sizeof(*pointer));
if (pointer == NULL) {
CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID, ERR_R_MALLOC_FAILURE);
return (0);
}
pointer->references = 1;
pointer->data = dynlock_create_callback(OPENSSL_FILE, OPENSSL_LINE);
if (pointer->data == NULL) {
OPENSSL_free(pointer);
CRYPTOerr(CRYPTO_F_CRYPTO_GET_NEW_DYNLOCKID, ERR_R_MALLOC_FAILURE);
return (0);
}
CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
/* First, try to find an existing empty slot */
i = sk_CRYPTO_dynlock_find(dyn_locks, NULL);
/* If there was none, push, thereby creating a new one */
if (i == -1)
/*
* Since sk_push() returns the number of items on the stack, not the
* location of the pushed item, we need to transform the returned
* number into a position, by decreasing it.
*/
i = sk_CRYPTO_dynlock_push(dyn_locks, pointer) - 1;
else
/*
* If we found a place with a NULL pointer, put our pointer in it.
*/
(void)sk_CRYPTO_dynlock_set(dyn_locks, i, pointer);
CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
if (i == -1) {
dynlock_destroy_callback(pointer->data, OPENSSL_FILE, OPENSSL_LINE);
OPENSSL_free(pointer);
} else
i += 1; /* to avoid 0 */
return -i;
}
void CRYPTO_destroy_dynlockid(int i)
{
CRYPTO_dynlock *pointer = NULL;
if (i)
i = -i - 1;
if (dynlock_destroy_callback == NULL)
return;
CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
if (dyn_locks == NULL || i >= sk_CRYPTO_dynlock_num(dyn_locks)) {
CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
return;
}
pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
if (pointer != NULL) {
--pointer->references;
#ifdef REF_DEBUG
if (pointer->references < 0) {
OPENSSL_showfatal("CRYPTO_destroy_dynlockid, bad reference count\n");
abort();
} else
#endif
if (pointer->references <= 0) {
(void)sk_CRYPTO_dynlock_set(dyn_locks, i, NULL);
} else
pointer = NULL;
}
CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
if (pointer) {
dynlock_destroy_callback(pointer->data, OPENSSL_FILE, OPENSSL_LINE);
OPENSSL_free(pointer);
}
}
struct CRYPTO_dynlock_value *CRYPTO_get_dynlock_value(int i)
{
CRYPTO_dynlock *pointer = NULL;
if (i)
i = -i - 1;
CRYPTO_w_lock(CRYPTO_LOCK_DYNLOCK);
if (dyn_locks != NULL && i < sk_CRYPTO_dynlock_num(dyn_locks))
pointer = sk_CRYPTO_dynlock_value(dyn_locks, i);
if (pointer)
pointer->references++;
CRYPTO_w_unlock(CRYPTO_LOCK_DYNLOCK);
if (pointer)
return pointer->data;
return NULL;
}
struct CRYPTO_dynlock_value *(*CRYPTO_get_dynlock_create_callback(void))
(const char *file, int line) {
return (dynlock_create_callback);
}
void (*CRYPTO_get_dynlock_lock_callback(void)) (int mode,
struct CRYPTO_dynlock_value
*l, const char *file,
int line) {
return (dynlock_lock_callback);
}
void (*CRYPTO_get_dynlock_destroy_callback(void))
(struct CRYPTO_dynlock_value *l, const char *file, int line) {
return (dynlock_destroy_callback);
}
void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *(*func)
(const char *file, int line))
{
dynlock_create_callback = func;
}
void CRYPTO_set_dynlock_lock_callback(void (*func) (int mode,
struct
CRYPTO_dynlock_value *l,
const char *file,
int line))
{
#ifdef OPENSSL_FIPS
FIPS_set_locking_callbacks(CRYPTO_lock, CRYPTO_add_lock);
#endif
dynlock_lock_callback = func;
}
void CRYPTO_set_dynlock_destroy_callback(void (*func)
(struct CRYPTO_dynlock_value *l,
const char *file, int line))
{
dynlock_destroy_callback = func;
}
void (*CRYPTO_get_locking_callback(void)) (int mode, int type,
const char *file, int line) {
return (locking_callback);
}
int (*CRYPTO_get_add_lock_callback(void)) (int *num, int mount, int type,
const char *file, int line) {
return (add_lock_callback);
}
void CRYPTO_set_locking_callback(void (*func) (int mode, int type,
const char *file, int line))
{
#ifdef OPENSSL_FIPS
FIPS_set_locking_callbacks(CRYPTO_lock, CRYPTO_add_lock);
#endif
locking_callback = func;
}
void CRYPTO_set_add_lock_callback(int (*func) (int *num, int mount, int type,
const char *file, int line))
{
add_lock_callback = func;
}
void CRYPTO_lock(int mode, int type, const char *file, int line)
{
#ifdef LOCK_DEBUG
{
CRYPTO_THREADID id;
char *rw_text, *operation_text;
if (mode & CRYPTO_LOCK)
operation_text = "lock ";
else if (mode & CRYPTO_UNLOCK)
operation_text = "unlock";
else
operation_text = "ERROR ";
if (mode & CRYPTO_READ)
rw_text = "r";
else if (mode & CRYPTO_WRITE)
rw_text = "w";
else
rw_text = "ERROR";
CRYPTO_THREADID_current(&id);
fprintf(stderr, "lock:%08lx:(%s)%s %-18s %s:%d\n",
CRYPTO_THREADID_hash(&id), rw_text, operation_text,
CRYPTO_get_lock_name(type), file, line);
}
#endif
if (type < 0) {
if (dynlock_lock_callback != NULL) {
struct CRYPTO_dynlock_value *pointer
= CRYPTO_get_dynlock_value(type);
OPENSSL_assert(pointer != NULL);
dynlock_lock_callback(mode, pointer, file, line);
CRYPTO_destroy_dynlockid(type);
}
} else if (locking_callback != NULL)
locking_callback(mode, type, file, line);
}
int CRYPTO_add_lock(int *pointer, int amount, int type, const char *file,
int line)
{
int ret = 0;
if (add_lock_callback != NULL) {
#ifdef LOCK_DEBUG
int before = *pointer;
#endif
ret = add_lock_callback(pointer, amount, type, file, line);
#ifdef LOCK_DEBUG
{
CRYPTO_THREADID id;
CRYPTO_THREADID_current(&id);
fprintf(stderr, "ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
CRYPTO_THREADID_hash(&id), before, amount, ret,
CRYPTO_get_lock_name(type), file, line);
}
#endif
} else {
CRYPTO_lock(CRYPTO_LOCK | CRYPTO_WRITE, type, file, line);
ret = *pointer + amount;
#ifdef LOCK_DEBUG
{
CRYPTO_THREADID id;
CRYPTO_THREADID_current(&id);
fprintf(stderr, "ladd:%08lx:%2d+%2d->%2d %-18s %s:%d\n",
CRYPTO_THREADID_hash(&id),
*pointer, amount, ret,
CRYPTO_get_lock_name(type), file, line);
}
#endif
*pointer = ret;
CRYPTO_lock(CRYPTO_UNLOCK | CRYPTO_WRITE, type, file, line);
}
return (ret);
}
const char *CRYPTO_get_lock_name(int type)
{
if (type < 0)
return ("dynamic");
else if (type < CRYPTO_NUM_LOCKS)
return (lock_names[type]);
else if (type - CRYPTO_NUM_LOCKS > sk_OPENSSL_STRING_num(app_locks))
return ("ERROR");
else
return (sk_OPENSSL_STRING_value(app_locks, type - CRYPTO_NUM_LOCKS));
}
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