pineapple/externals/libressl/crypto/engine/eng_ctrl.c
2020-12-28 15:15:37 +00:00

379 lines
12 KiB
C
Executable file

/* $OpenBSD: eng_ctrl.c,v 1.11 2017/01/29 17:49:23 beck Exp $ */
/* ====================================================================
* Copyright (c) 1999-2001 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 <string.h>
#include <openssl/err.h>
#include "eng_int.h"
/* 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 = "";
/* 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)(void))
{
int idx;
int ret;
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) {
ENGINEerror(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)) {
ENGINEerror(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)) {
ENGINEerror(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:
ret = snprintf(s, strlen(e->cmd_defns[idx].cmd_name) + 1,
"%s", e->cmd_defns[idx].cmd_name);
if (ret >= (strlen(e->cmd_defns[idx].cmd_name) + 1))
ret = -1;
return ret;
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) {
ret = snprintf(s,
strlen(e->cmd_defns[idx].cmd_desc) + 1,
"%s", e->cmd_defns[idx].cmd_desc);
if (ret >= strlen(e->cmd_defns[idx].cmd_desc) + 1)
ret = -1;
return ret;
}
ret = snprintf(s, strlen(int_no_description) + 1, "%s",
int_no_description);
if (ret >= strlen(int_no_description) + 1)
ret = -1;
return ret;
case ENGINE_CTRL_GET_CMD_FLAGS:
return e->cmd_defns[idx].cmd_flags;
}
/* Shouldn't really be here ... */
ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
return -1;
}
int
ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
{
int ctrl_exists, ref_exists;
if (e == NULL) {
ENGINEerror(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) {
ENGINEerror(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) {
ENGINEerror(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) {
ENGINEerror(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) {
ENGINEerror(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)(void), int cmd_optional)
{
int num;
if ((e == NULL) || (cmd_name == NULL)) {
ENGINEerror(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;
}
ENGINEerror(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) > 0)
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)) {
ENGINEerror(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;
}
ENGINEerror(ENGINE_R_INVALID_CMD_NAME);
return 0;
}
if (!ENGINE_cmd_is_executable(e, num)) {
ENGINEerror(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. */
ENGINEerror(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) {
ENGINEerror(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) > 0)
return 1;
return 0;
}
/* So, we require input */
if (arg == NULL) {
ENGINEerror(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) > 0)
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)) {
ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
return 0;
}
l = strtol(arg, &ptr, 10);
if ((arg == ptr) || (*ptr != '\0')) {
ENGINEerror(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) > 0)
return 1;
return 0;
}