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Ulf Möller 2001-09-10 20:16:31 +00:00
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crypto/engine/engine_lib.c
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/* crypto/engine/engine_lib.c */
/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
* project 2000.
*/
/* ====================================================================
* Copyright (c) 1999 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
* licensing@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).
*
*/
#include <openssl/crypto.h>
#include "cryptlib.h"
#include "engine_int.h"
#include <openssl/engine.h>
/* These pointers each have their own "functional reference" when they
* are non-NULL. Similarly, when they are retrieved by a call to
* ENGINE_get_default_[RSA|DSA|...] the returned pointer is also a
* reference and the caller is responsible for freeing that when they
* are finished with it (with a call to ENGINE_finish() *NOT* just
* ENGINE_free()!!!!!!). */
#ifndef OPENSSL_NO_RSA
static ENGINE *engine_def_rsa = NULL;
#endif
#ifndef OPENSSL_NO_DSA
static ENGINE *engine_def_dsa = NULL;
#endif
#ifndef OPENSSL_NO_DH
static ENGINE *engine_def_dh = NULL;
#endif
static ENGINE *engine_def_rand = NULL;
static ENGINE *engine_def_bn_mod_exp = NULL;
static ENGINE *engine_def_bn_mod_exp_crt = NULL;
/* A static "once-only" flag used to control if/when the above were
* initialised to suitable start-up defaults. */
static int engine_def_flag = 0;
/* When querying a ENGINE-specific control command's 'description', this string
* is used if the ENGINE_CMD_DEFN has cmd_desc set to NULL. */
static const char *int_no_description = "";
/* This is used in certain static utility functions to save code
* repetition for per-algorithm functions. */
typedef enum {
ENGINE_TYPE_RSA,
ENGINE_TYPE_DSA,
ENGINE_TYPE_DH,
ENGINE_TYPE_RAND,
ENGINE_TYPE_BN_MOD_EXP,
ENGINE_TYPE_BN_MOD_EXP_CRT
} ENGINE_TYPE;
static void engine_def_check_util(ENGINE **def, ENGINE *val)
{
*def = val;
val->struct_ref++;
val->funct_ref++;
engine_ref_debug(val, 0, 1)
engine_ref_debug(val, 1, 1)
}
/* In a slight break with convention - this static function must be
* called *outside* any locking of CRYPTO_LOCK_ENGINE. */
static void engine_def_check(void)
{
ENGINE *e;
if(engine_def_flag)
return;
e = ENGINE_get_first();
if(e == NULL)
/* The list is empty ... not much we can do! */
return;
/* We have a structural reference, see if getting a functional
* reference is possible. This is done to cope with init errors
* in the engine - the following locked code does a bunch of
* manual "ENGINE_init"s which do *not* allow such an init
* error so this is worth doing. */
if(ENGINE_init(e))
{
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
/* Doing another check here prevents an obvious race
* condition because the whole function itself cannot
* be locked. */
if(engine_def_flag)
goto skip_set_defaults;
/* OK, we got a functional reference, so we get one each
* for the defaults too. */
#ifndef OPENSSL_NO_RSA
engine_def_check_util(&engine_def_rsa, e);
#endif
#ifndef OPENSSL_NO_DSA
engine_def_check_util(&engine_def_dsa, e);
#endif
#ifndef OPENSSL_NO_DH
engine_def_check_util(&engine_def_dh, e);
#endif
engine_def_check_util(&engine_def_rand, e);
engine_def_check_util(&engine_def_bn_mod_exp, e);
engine_def_check_util(&engine_def_bn_mod_exp_crt, e);
engine_def_flag = 1;
skip_set_defaults:
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
/* The "if" needs to be balanced out. */
ENGINE_finish(e);
}
/* We need to balance out the fact we obtained a structural
* reference to begin with from ENGINE_get_first(). */
ENGINE_free(e);
}
/* Initialise a engine type for use (or up its functional reference count
* if it's already in use). */
int ENGINE_init(ENGINE *e)
{
int to_return = 1;
if(e == NULL)
{
ENGINEerr(ENGINE_F_ENGINE_INIT,ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
if((e->funct_ref == 0) && e->init)
/* This is the first functional reference and the engine
* requires initialisation so we do it now. */
to_return = e->init(e);
if(to_return)
{
/* OK, we return a functional reference which is also a
* structural reference. */
e->struct_ref++;
e->funct_ref++;
engine_ref_debug(e, 0, 1)
engine_ref_debug(e, 1, 1)
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
return to_return;
}
/* Free a functional reference to a engine type */
int ENGINE_finish(ENGINE *e)
{
int to_return = 1;
if(e == NULL)
{
ENGINEerr(ENGINE_F_ENGINE_FINISH,ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
/* Reduce the functional reference count here so if it's the terminating
* case, we can release the lock safely and call the finish() handler
* without risk of a race. We get a race if we leave the count until
* after and something else is calling "finish" at the same time -
* there's a chance that both threads will together take the count from
* 2 to 0 without either calling finish(). */
e->funct_ref--;
engine_ref_debug(e, 1, -1)
if((e->funct_ref == 0) && e->finish)
{
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
if(!(to_return = e->finish(e)))
{
ENGINEerr(ENGINE_F_ENGINE_FINISH,ENGINE_R_FINISH_FAILED);
return 0;
}
}
else
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
#ifdef REF_CHECK
if(e->funct_ref < 0)
{
fprintf(stderr,"ENGINE_finish, bad functional reference count\n");
abort();
}
#endif
/* Release the structural reference too */
if(!ENGINE_free(e))
{
ENGINEerr(ENGINE_F_ENGINE_FINISH,ENGINE_R_FINISH_FAILED);
return 0;
}
return to_return;
}
EVP_PKEY *ENGINE_load_private_key(ENGINE *e, const char *key_id,
UI_METHOD *ui_method, void *callback_data)
{
EVP_PKEY *pkey;
if(e == NULL)
{
ENGINEerr(ENGINE_F_ENGINE_LOAD_PRIVATE_KEY,
ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
if(e->funct_ref == 0)
{
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
ENGINEerr(ENGINE_F_ENGINE_LOAD_PRIVATE_KEY,
ENGINE_R_NOT_INITIALISED);
return 0;
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
if (!e->load_privkey)
{
ENGINEerr(ENGINE_F_ENGINE_LOAD_PRIVATE_KEY,
ENGINE_R_NO_LOAD_FUNCTION);
return 0;
}
pkey = e->load_privkey(e, key_id, ui_method, callback_data);
if (!pkey)
{
ENGINEerr(ENGINE_F_ENGINE_LOAD_PRIVATE_KEY,
ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
return 0;
}
return pkey;
}
EVP_PKEY *ENGINE_load_public_key(ENGINE *e, const char *key_id,
UI_METHOD *ui_method, void *callback_data)
{
EVP_PKEY *pkey;
if(e == NULL)
{
ENGINEerr(ENGINE_F_ENGINE_LOAD_PUBLIC_KEY,
ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
if(e->funct_ref == 0)
{
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
ENGINEerr(ENGINE_F_ENGINE_LOAD_PUBLIC_KEY,
ENGINE_R_NOT_INITIALISED);
return 0;
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
if (!e->load_pubkey)
{
ENGINEerr(ENGINE_F_ENGINE_LOAD_PUBLIC_KEY,
ENGINE_R_NO_LOAD_FUNCTION);
return 0;
}
pkey = e->load_pubkey(e, key_id, ui_method, callback_data);
if (!pkey)
{
ENGINEerr(ENGINE_F_ENGINE_LOAD_PUBLIC_KEY,
ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
return 0;
}
return pkey;
}
/* These internal functions handle 'CMD'-related control commands when the
* ENGINE in question has asked us to take care of it (ie. the ENGINE did not
* set the ENGINE_FLAGS_MANUAL_CMD_CTRL flag. */
static int int_ctrl_cmd_is_null(const ENGINE_CMD_DEFN *defn)
{
if((defn->cmd_num == 0) || (defn->cmd_name == NULL))
return 1;
return 0;
}
static int int_ctrl_cmd_by_name(const ENGINE_CMD_DEFN *defn, const char *s)
{
int idx = 0;
while(!int_ctrl_cmd_is_null(defn) && (strcmp(defn->cmd_name, s) != 0))
{
idx++;
defn++;
}
if(int_ctrl_cmd_is_null(defn))
/* The given name wasn't found */
return -1;
return idx;
}
static int int_ctrl_cmd_by_num(const ENGINE_CMD_DEFN *defn, unsigned int num)
{
int idx = 0;
/* NB: It is stipulated that 'cmd_defn' lists are ordered by cmd_num. So
* our searches don't need to take any longer than necessary. */
while(!int_ctrl_cmd_is_null(defn) && (defn->cmd_num < num))
{
idx++;
defn++;
}
if(defn->cmd_num == num)
return idx;
/* The given cmd_num wasn't found */
return -1;
}
static int int_ctrl_helper(ENGINE *e, int cmd, long i, void *p, void (*f)())
{
int idx;
char *s = (char *)p;
/* Take care of the easy one first (eg. it requires no searches) */
if(cmd == ENGINE_CTRL_GET_FIRST_CMD_TYPE)
{
if((e->cmd_defns == NULL) || int_ctrl_cmd_is_null(e->cmd_defns))
return 0;
return e->cmd_defns->cmd_num;
}
/* One or two commands require that "p" be a valid string buffer */
if((cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) ||
(cmd == ENGINE_CTRL_GET_NAME_FROM_CMD) ||
(cmd == ENGINE_CTRL_GET_DESC_FROM_CMD))
{
if(s == NULL)
{
ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
}
/* Now handle cmd_name -> cmd_num conversion */
if(cmd == ENGINE_CTRL_GET_CMD_FROM_NAME)
{
if((e->cmd_defns == NULL) || ((idx = int_ctrl_cmd_by_name(
e->cmd_defns, s)) < 0))
{
ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
ENGINE_R_INVALID_CMD_NAME);
return -1;
}
return e->cmd_defns[idx].cmd_num;
}
/* For the rest of the commands, the 'long' argument must specify a
* valie command number - so we need to conduct a search. */
if((e->cmd_defns == NULL) || ((idx = int_ctrl_cmd_by_num(e->cmd_defns,
(unsigned int)i)) < 0))
{
ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
ENGINE_R_INVALID_CMD_NUMBER);
return -1;
}
/* Now the logic splits depending on command type */
switch(cmd)
{
case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
idx++;
if(int_ctrl_cmd_is_null(e->cmd_defns + idx))
/* end-of-list */
return 0;
else
return e->cmd_defns[idx].cmd_num;
case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
return strlen(e->cmd_defns[idx].cmd_name);
case ENGINE_CTRL_GET_NAME_FROM_CMD:
return sprintf(s, "%s", e->cmd_defns[idx].cmd_name);
case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
if(e->cmd_defns[idx].cmd_desc)
return strlen(e->cmd_defns[idx].cmd_desc);
return strlen(int_no_description);
case ENGINE_CTRL_GET_DESC_FROM_CMD:
if(e->cmd_defns[idx].cmd_desc)
return sprintf(s, "%s", e->cmd_defns[idx].cmd_desc);
return sprintf(s, "%s", int_no_description);
case ENGINE_CTRL_GET_CMD_FLAGS:
return e->cmd_defns[idx].cmd_flags;
}
/* Shouldn't really be here ... */
ENGINEerr(ENGINE_F_INT_CTRL_HELPER,ENGINE_R_INTERNAL_LIST_ERROR);
return -1;
}
int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)())
{
int ctrl_exists, ref_exists;
if(e == NULL)
{
ENGINEerr(ENGINE_F_ENGINE_CTRL,ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
ref_exists = ((e->struct_ref > 0) ? 1 : 0);
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
ctrl_exists = ((e->ctrl == NULL) ? 0 : 1);
if(!ref_exists)
{
ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_REFERENCE);
return 0;
}
/* Intercept any "root-level" commands before trying to hand them on to
* ctrl() handlers. */
switch(cmd)
{
case ENGINE_CTRL_HAS_CTRL_FUNCTION:
return ctrl_exists;
case ENGINE_CTRL_GET_FIRST_CMD_TYPE:
case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
case ENGINE_CTRL_GET_CMD_FROM_NAME:
case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
case ENGINE_CTRL_GET_NAME_FROM_CMD:
case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
case ENGINE_CTRL_GET_DESC_FROM_CMD:
case ENGINE_CTRL_GET_CMD_FLAGS:
if(ctrl_exists && !(e->flags & ENGINE_FLAGS_MANUAL_CMD_CTRL))
return int_ctrl_helper(e,cmd,i,p,f);
if(!ctrl_exists)
{
ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_CONTROL_FUNCTION);
/* For these cmd-related functions, failure is indicated
* by a -1 return value (because 0 is used as a valid
* return in some places). */
return -1;
}
default:
break;
}
/* Anything else requires a ctrl() handler to exist. */
if(!ctrl_exists)
{
ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_CONTROL_FUNCTION);
return 0;
}
return e->ctrl(e, cmd, i, p, f);
}
int ENGINE_cmd_is_executable(ENGINE *e, int cmd)
{
int flags;
if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, cmd, NULL, NULL)) < 0)
{
ENGINEerr(ENGINE_F_ENGINE_CMD_IS_EXECUTABLE,
ENGINE_R_INVALID_CMD_NUMBER);
return 0;
}
if(!(flags & ENGINE_CMD_FLAG_NO_INPUT) &&
!(flags & ENGINE_CMD_FLAG_NUMERIC) &&
!(flags & ENGINE_CMD_FLAG_STRING))
return 0;
return 1;
}
int ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name,
long i, void *p, void (*f)(), int cmd_optional)
{
int num;
if((e == NULL) || (cmd_name == NULL))
{
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
ENGINE_CTRL_GET_CMD_FROM_NAME,
0, (void *)cmd_name, NULL)) <= 0))
{
/* If the command didn't *have* to be supported, we fake
* success. This allows certain settings to be specified for
* multiple ENGINEs and only require a change of ENGINE id
* (without having to selectively apply settings). Eg. changing
* from a hardware device back to the regular software ENGINE
* without editing the config file, etc. */
if(cmd_optional)
{
ERR_clear_error();
return 1;
}
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD,
ENGINE_R_INVALID_CMD_NAME);
return 0;
}
/* Force the result of the control command to 0 or 1, for the reasons
* mentioned before. */
if (ENGINE_ctrl(e, num, i, p, f))
return 1;
return 0;
}
int ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,
int cmd_optional)
{
int num, flags;
long l;
char *ptr;
if((e == NULL) || (cmd_name == NULL))
{
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
if((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
ENGINE_CTRL_GET_CMD_FROM_NAME,
0, (void *)cmd_name, NULL)) <= 0))
{
/* If the command didn't *have* to be supported, we fake
* success. This allows certain settings to be specified for
* multiple ENGINEs and only require a change of ENGINE id
* (without having to selectively apply settings). Eg. changing
* from a hardware device back to the regular software ENGINE
* without editing the config file, etc. */
if(cmd_optional)
{
ERR_clear_error();
return 1;
}
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
ENGINE_R_INVALID_CMD_NAME);
return 0;
}
if(!ENGINE_cmd_is_executable(e, num))
{
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
ENGINE_R_CMD_NOT_EXECUTABLE);
return 0;
}
if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num, NULL, NULL)) < 0)
{
/* Shouldn't happen, given that ENGINE_cmd_is_executable()
* returned success. */
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
ENGINE_R_INTERNAL_LIST_ERROR);
return 0;
}
/* If the command takes no input, there must be no input. And vice
* versa. */
if(flags & ENGINE_CMD_FLAG_NO_INPUT)
{
if(arg != NULL)
{
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
ENGINE_R_COMMAND_TAKES_NO_INPUT);
return 0;
}
/* We deliberately force the result of ENGINE_ctrl() to 0 or 1
* rather than returning it as "return data". This is to ensure
* usage of these commands is consistent across applications and
* that certain applications don't understand it one way, and
* others another. */
if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL))
return 1;
return 0;
}
/* So, we require input */
if(arg == NULL)
{
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
ENGINE_R_COMMAND_TAKES_INPUT);
return 0;
}
/* If it takes string input, that's easy */
if(flags & ENGINE_CMD_FLAG_STRING)
{
/* Same explanation as above */
if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL))
return 1;
return 0;
}
/* If it doesn't take numeric either, then it is unsupported for use in
* a config-setting situation, which is what this function is for. This
* should never happen though, because ENGINE_cmd_is_executable() was
* used. */
if(!(flags & ENGINE_CMD_FLAG_NUMERIC))
{
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
ENGINE_R_INTERNAL_LIST_ERROR);
return 0;
}
l = strtol(arg, &ptr, 10);
if((arg == ptr) || (*ptr != '\0'))
{
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
ENGINE_R_ARGUMENT_IS_NOT_A_NUMBER);
return 0;
}
/* Force the result of the control command to 0 or 1, for the reasons
* mentioned before. */
if(ENGINE_ctrl(e, num, l, NULL, NULL))
return 1;
return 0;
}
static ENGINE *engine_get_default_type(ENGINE_TYPE t)
{
ENGINE *ret = NULL;
/* engine_def_check is lean and mean and won't replace any
* prior default engines ... so we must ensure that it is always
* the first function to get to touch the default values. */
engine_def_check();
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
switch(t)
{
#ifndef OPENSSL_NO_RSA
case ENGINE_TYPE_RSA:
ret = engine_def_rsa; break;
#endif
#ifndef OPENSSL_NO_DSA
case ENGINE_TYPE_DSA:
ret = engine_def_dsa; break;
#endif
#ifndef OPENSSL_NO_DH
case ENGINE_TYPE_DH:
ret = engine_def_dh; break;
#endif
case ENGINE_TYPE_RAND:
ret = engine_def_rand; break;
case ENGINE_TYPE_BN_MOD_EXP:
ret = engine_def_bn_mod_exp; break;
case ENGINE_TYPE_BN_MOD_EXP_CRT:
ret = engine_def_bn_mod_exp_crt; break;
default:
break;
}
/* Unforunately we can't do this work outside the lock with a
* call to ENGINE_init() because that would leave a race
* condition open. */
if(ret)
{
ret->struct_ref++;
ret->funct_ref++;
engine_ref_debug(ret, 0, 1)
engine_ref_debug(ret, 1, 1)
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
return ret;
}
#ifndef OPENSSL_NO_RSA
ENGINE *ENGINE_get_default_RSA(void)
{
return engine_get_default_type(ENGINE_TYPE_RSA);
}
#endif
#ifndef OPENSSL_NO_DSA
ENGINE *ENGINE_get_default_DSA(void)
{
return engine_get_default_type(ENGINE_TYPE_DSA);
}
#endif
#ifndef OPENSSL_NO_DH
ENGINE *ENGINE_get_default_DH(void)
{
return engine_get_default_type(ENGINE_TYPE_DH);
}
#endif
ENGINE *ENGINE_get_default_RAND(void)
{
return engine_get_default_type(ENGINE_TYPE_RAND);
}
ENGINE *ENGINE_get_default_BN_mod_exp(void)
{
return engine_get_default_type(ENGINE_TYPE_BN_MOD_EXP);
}
ENGINE *ENGINE_get_default_BN_mod_exp_crt(void)
{
return engine_get_default_type(ENGINE_TYPE_BN_MOD_EXP_CRT);
}
static int engine_set_default_type(ENGINE_TYPE t, ENGINE *e)
{
ENGINE *old = NULL;
/* engine_def_check is lean and mean and won't replace any
* prior default engines ... so we must ensure that it is always
* the first function to get to touch the default values. */
engine_def_check();
/* Attempt to get a functional reference (we need one anyway, but
* also, 'e' may be just a structural reference being passed in so
* this call may actually be the first). */
if(e && !ENGINE_init(e))
{
ENGINEerr(ENGINE_F_ENGINE_SET_DEFAULT_TYPE,
ENGINE_R_INIT_FAILED);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
switch(t)
{
#ifndef OPENSSL_NO_RSA
case ENGINE_TYPE_RSA:
old = engine_def_rsa;
engine_def_rsa = e; break;
#endif
#ifndef OPENSSL_NO_DSA
case ENGINE_TYPE_DSA:
old = engine_def_dsa;
engine_def_dsa = e; break;
#endif
#ifndef OPENSSL_NO_DH
case ENGINE_TYPE_DH:
old = engine_def_dh;
engine_def_dh = e; break;
#endif
case ENGINE_TYPE_RAND:
old = engine_def_rand;
engine_def_rand = e; break;
case ENGINE_TYPE_BN_MOD_EXP:
old = engine_def_bn_mod_exp;
engine_def_bn_mod_exp = e; break;
case ENGINE_TYPE_BN_MOD_EXP_CRT:
old = engine_def_bn_mod_exp_crt;
engine_def_bn_mod_exp_crt = e; break;
default:
break;
}
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
/* If we've replaced a previous value, then we need to remove the
* functional reference we had. */
if(old && !ENGINE_finish(old))
{
ENGINEerr(ENGINE_F_ENGINE_SET_DEFAULT_TYPE,
ENGINE_R_FINISH_FAILED);
return 0;
}
return 1;
}
#ifndef OPENSSL_NO_RSA
int ENGINE_set_default_RSA(ENGINE *e)
{
return engine_set_default_type(ENGINE_TYPE_RSA, e);
}
#endif
#ifndef OPENSSL_NO_DSA
int ENGINE_set_default_DSA(ENGINE *e)
{
return engine_set_default_type(ENGINE_TYPE_DSA, e);
}
#endif
#ifndef OPENSSL_NO_DH
int ENGINE_set_default_DH(ENGINE *e)
{
return engine_set_default_type(ENGINE_TYPE_DH, e);
}
#endif
int ENGINE_set_default_RAND(ENGINE *e)
{
return engine_set_default_type(ENGINE_TYPE_RAND, e);
}
int ENGINE_set_default_BN_mod_exp(ENGINE *e)
{
return engine_set_default_type(ENGINE_TYPE_BN_MOD_EXP, e);
}
int ENGINE_set_default_BN_mod_exp_crt(ENGINE *e)
{
return engine_set_default_type(ENGINE_TYPE_BN_MOD_EXP_CRT, e);
}
int ENGINE_set_default(ENGINE *e, unsigned int flags)
{
#ifndef OPENSSL_NO_RSA
if((flags & ENGINE_METHOD_RSA) && e->rsa_meth &&
!ENGINE_set_default_RSA(e))
return 0;
#endif
#ifndef OPENSSL_NO_DSA
if((flags & ENGINE_METHOD_DSA) && e->dsa_meth &&
!ENGINE_set_default_DSA(e))
return 0;
#endif
#ifndef OPENSSL_NO_DH
if((flags & ENGINE_METHOD_DH) && e->dh_meth &&
!ENGINE_set_default_DH(e))
return 0;
#endif
if((flags & ENGINE_METHOD_RAND) && e->rand_meth &&
!ENGINE_set_default_RAND(e))
return 0;
if((flags & ENGINE_METHOD_BN_MOD_EXP) && e->bn_mod_exp &&
!ENGINE_set_default_BN_mod_exp(e))
return 0;
if((flags & ENGINE_METHOD_BN_MOD_EXP_CRT) && e->bn_mod_exp_crt &&
!ENGINE_set_default_BN_mod_exp_crt(e))
return 0;
return 1;
}
int ENGINE_clear_defaults(void)
{
/* If the defaults haven't even been set yet, don't bother. Any kind of
* "cleanup" has a kind of implicit race-condition if another thread is
* trying to keep going, so we don't address that with locking. The
* first ENGINE_set_default_*** call will actually *create* a standard
* set of default ENGINEs (including init() and functional reference
* counts aplenty) before the rest of this function undoes them all. So
* save some hassle ... */
if(!engine_def_flag)
return 1;
if((0 == 1) ||
#ifndef OPENSSL_NO_RSA
!ENGINE_set_default_RSA(NULL) ||
#endif
#ifndef OPENSSL_NO_DSA
!ENGINE_set_default_DSA(NULL) ||
#endif
#ifndef OPENSSL_NO_DH
!ENGINE_set_default_DH(NULL) ||
#endif
!ENGINE_set_default_RAND(NULL) ||
!ENGINE_set_default_BN_mod_exp(NULL) ||
!ENGINE_set_default_BN_mod_exp_crt(NULL) ||
!RAND_set_rand_method(NULL))
return 0;
return 1;
}