380 lines
12 KiB
C
380 lines
12 KiB
C
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/* $OpenBSD: eng_ctrl.c,v 1.11 2017/01/29 17:49:23 beck Exp $ */
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/* ====================================================================
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* Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <string.h>
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#include <openssl/err.h>
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#include "eng_int.h"
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/* When querying a ENGINE-specific control command's 'description', this string
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* is used if the ENGINE_CMD_DEFN has cmd_desc set to NULL. */
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static const char *int_no_description = "";
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/* These internal functions handle 'CMD'-related control commands when the
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* ENGINE in question has asked us to take care of it (ie. the ENGINE did not
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* set the ENGINE_FLAGS_MANUAL_CMD_CTRL flag. */
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static int
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int_ctrl_cmd_is_null(const ENGINE_CMD_DEFN *defn)
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{
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if ((defn->cmd_num == 0) || (defn->cmd_name == NULL))
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return 1;
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return 0;
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}
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static int
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int_ctrl_cmd_by_name(const ENGINE_CMD_DEFN *defn, const char *s)
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{
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int idx = 0;
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while (!int_ctrl_cmd_is_null(defn) &&
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(strcmp(defn->cmd_name, s) != 0)) {
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idx++;
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defn++;
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}
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if (int_ctrl_cmd_is_null(defn))
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/* The given name wasn't found */
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return -1;
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return idx;
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}
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static int
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int_ctrl_cmd_by_num(const ENGINE_CMD_DEFN *defn, unsigned int num)
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{
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int idx = 0;
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/* NB: It is stipulated that 'cmd_defn' lists are ordered by cmd_num. So
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* our searches don't need to take any longer than necessary. */
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while (!int_ctrl_cmd_is_null(defn) && (defn->cmd_num < num)) {
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idx++;
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defn++;
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}
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if (defn->cmd_num == num)
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return idx;
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/* The given cmd_num wasn't found */
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return -1;
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}
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static int
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int_ctrl_helper(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
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{
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int idx;
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int ret;
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char *s = (char *)p;
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/* Take care of the easy one first (eg. it requires no searches) */
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if (cmd == ENGINE_CTRL_GET_FIRST_CMD_TYPE) {
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if ((e->cmd_defns == NULL) ||
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int_ctrl_cmd_is_null(e->cmd_defns))
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return 0;
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return e->cmd_defns->cmd_num;
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}
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/* One or two commands require that "p" be a valid string buffer */
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if ((cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) ||
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(cmd == ENGINE_CTRL_GET_NAME_FROM_CMD) ||
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(cmd == ENGINE_CTRL_GET_DESC_FROM_CMD)) {
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if (s == NULL) {
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ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
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return -1;
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}
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}
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/* Now handle cmd_name -> cmd_num conversion */
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if (cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) {
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if ((e->cmd_defns == NULL) ||
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((idx = int_ctrl_cmd_by_name(e->cmd_defns, s)) < 0)) {
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ENGINEerror(ENGINE_R_INVALID_CMD_NAME);
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return -1;
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}
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return e->cmd_defns[idx].cmd_num;
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}
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/* For the rest of the commands, the 'long' argument must specify a
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* valie command number - so we need to conduct a search. */
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if ((e->cmd_defns == NULL) ||
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((idx = int_ctrl_cmd_by_num(e->cmd_defns, (unsigned int)i)) < 0)) {
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ENGINEerror(ENGINE_R_INVALID_CMD_NUMBER);
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return -1;
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}
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/* Now the logic splits depending on command type */
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switch (cmd) {
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case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
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idx++;
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if (int_ctrl_cmd_is_null(e->cmd_defns + idx))
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/* end-of-list */
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return 0;
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else
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return e->cmd_defns[idx].cmd_num;
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case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
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return strlen(e->cmd_defns[idx].cmd_name);
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case ENGINE_CTRL_GET_NAME_FROM_CMD:
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ret = snprintf(s, strlen(e->cmd_defns[idx].cmd_name) + 1,
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"%s", e->cmd_defns[idx].cmd_name);
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if (ret >= (strlen(e->cmd_defns[idx].cmd_name) + 1))
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ret = -1;
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return ret;
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case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
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if (e->cmd_defns[idx].cmd_desc)
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return strlen(e->cmd_defns[idx].cmd_desc);
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return strlen(int_no_description);
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case ENGINE_CTRL_GET_DESC_FROM_CMD:
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if (e->cmd_defns[idx].cmd_desc) {
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ret = snprintf(s,
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strlen(e->cmd_defns[idx].cmd_desc) + 1,
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"%s", e->cmd_defns[idx].cmd_desc);
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if (ret >= strlen(e->cmd_defns[idx].cmd_desc) + 1)
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ret = -1;
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return ret;
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}
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ret = snprintf(s, strlen(int_no_description) + 1, "%s",
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int_no_description);
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if (ret >= strlen(int_no_description) + 1)
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ret = -1;
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return ret;
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case ENGINE_CTRL_GET_CMD_FLAGS:
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return e->cmd_defns[idx].cmd_flags;
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}
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/* Shouldn't really be here ... */
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ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
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return -1;
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}
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int
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ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
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{
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int ctrl_exists, ref_exists;
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if (e == NULL) {
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ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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ref_exists = ((e->struct_ref > 0) ? 1 : 0);
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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ctrl_exists = ((e->ctrl == NULL) ? 0 : 1);
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if (!ref_exists) {
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ENGINEerror(ENGINE_R_NO_REFERENCE);
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return 0;
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}
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/* Intercept any "root-level" commands before trying to hand them on to
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* ctrl() handlers. */
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switch (cmd) {
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case ENGINE_CTRL_HAS_CTRL_FUNCTION:
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return ctrl_exists;
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case ENGINE_CTRL_GET_FIRST_CMD_TYPE:
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case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
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case ENGINE_CTRL_GET_CMD_FROM_NAME:
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case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
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case ENGINE_CTRL_GET_NAME_FROM_CMD:
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case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
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case ENGINE_CTRL_GET_DESC_FROM_CMD:
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case ENGINE_CTRL_GET_CMD_FLAGS:
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if (ctrl_exists && !(e->flags & ENGINE_FLAGS_MANUAL_CMD_CTRL))
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return int_ctrl_helper(e, cmd, i, p, f);
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if (!ctrl_exists) {
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ENGINEerror(ENGINE_R_NO_CONTROL_FUNCTION);
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/* For these cmd-related functions, failure is indicated
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* by a -1 return value (because 0 is used as a valid
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* return in some places). */
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return -1;
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}
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default:
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break;
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}
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/* Anything else requires a ctrl() handler to exist. */
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if (!ctrl_exists) {
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ENGINEerror(ENGINE_R_NO_CONTROL_FUNCTION);
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return 0;
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}
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return e->ctrl(e, cmd, i, p, f);
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}
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int
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ENGINE_cmd_is_executable(ENGINE *e, int cmd)
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{
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int flags;
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if ((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, cmd,
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NULL, NULL)) < 0) {
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ENGINEerror(ENGINE_R_INVALID_CMD_NUMBER);
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return 0;
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}
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if (!(flags & ENGINE_CMD_FLAG_NO_INPUT) &&
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!(flags & ENGINE_CMD_FLAG_NUMERIC) &&
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!(flags & ENGINE_CMD_FLAG_STRING))
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return 0;
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return 1;
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}
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int
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ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name, long i, void *p,
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void (*f)(void), int cmd_optional)
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{
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int num;
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if ((e == NULL) || (cmd_name == NULL)) {
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ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if ((e->ctrl == NULL) ||
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((num = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FROM_NAME,
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0, (void *)cmd_name, NULL)) <= 0)) {
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/* If the command didn't *have* to be supported, we fake
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* success. This allows certain settings to be specified for
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* multiple ENGINEs and only require a change of ENGINE id
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* (without having to selectively apply settings). Eg. changing
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* from a hardware device back to the regular software ENGINE
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* without editing the config file, etc. */
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if (cmd_optional) {
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ERR_clear_error();
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return 1;
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}
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ENGINEerror(ENGINE_R_INVALID_CMD_NAME);
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return 0;
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}
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/* Force the result of the control command to 0 or 1, for the reasons
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* mentioned before. */
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if (ENGINE_ctrl(e, num, i, p, f) > 0)
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return 1;
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return 0;
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}
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int
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ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,
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int cmd_optional)
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{
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int num, flags;
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long l;
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char *ptr;
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if ((e == NULL) || (cmd_name == NULL)) {
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ENGINEerror(ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if ((e->ctrl == NULL) ||
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((num = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FROM_NAME, 0,
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(void *)cmd_name, NULL)) <= 0)) {
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/* If the command didn't *have* to be supported, we fake
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* success. This allows certain settings to be specified for
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* multiple ENGINEs and only require a change of ENGINE id
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* (without having to selectively apply settings). Eg. changing
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* from a hardware device back to the regular software ENGINE
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* without editing the config file, etc. */
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if (cmd_optional) {
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ERR_clear_error();
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return 1;
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}
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ENGINEerror(ENGINE_R_INVALID_CMD_NAME);
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return 0;
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}
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if (!ENGINE_cmd_is_executable(e, num)) {
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ENGINEerror(ENGINE_R_CMD_NOT_EXECUTABLE);
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return 0;
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}
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if ((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num,
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NULL, NULL)) < 0) {
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/* Shouldn't happen, given that ENGINE_cmd_is_executable()
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* returned success. */
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ENGINEerror(ENGINE_R_INTERNAL_LIST_ERROR);
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return 0;
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}
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/* If the command takes no input, there must be no input. And vice
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* versa. */
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if (flags & ENGINE_CMD_FLAG_NO_INPUT) {
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if (arg != NULL) {
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ENGINEerror(ENGINE_R_COMMAND_TAKES_NO_INPUT);
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return 0;
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}
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/* We deliberately force the result of ENGINE_ctrl() to 0 or 1
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* rather than returning it as "return data". This is to ensure
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* usage of these commands is consistent across applications and
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* that certain applications don't understand it one way, and
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* others another. */
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if (ENGINE_ctrl(e, num, 0, (void *)arg, NULL) > 0)
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return 1;
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return 0;
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}
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/* So, we require input */
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if (arg == NULL) {
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ENGINEerror(ENGINE_R_COMMAND_TAKES_INPUT);
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return 0;
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}
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||
|
|
/* 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;
|
||
|
|
}
|