/*
* Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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 "eng_local.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;
char *s = (char *)p;
const ENGINE_CMD_DEFN *cdp;
/* 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 valid
* 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 */
cdp = &e->cmd_defns[idx];
switch (cmd) {
case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
cdp++;
return int_ctrl_cmd_is_null(cdp) ? 0 : cdp->cmd_num;
case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
return strlen(cdp->cmd_name);
case ENGINE_CTRL_GET_NAME_FROM_CMD:
return strlen(strcpy(s, cdp->cmd_name));
case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
return strlen(cdp->cmd_desc == NULL ? int_no_description
: cdp->cmd_desc);
case ENGINE_CTRL_GET_DESC_FROM_CMD:
return strlen(strcpy(s, cdp->cmd_desc == NULL ? int_no_description
: cdp->cmd_desc));
case ENGINE_CTRL_GET_CMD_FLAGS:
return cdp->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) (void))
{
int ctrl_exists, ref_exists;
if (e == NULL) {
ENGINEerr(ENGINE_F_ENGINE_CTRL, ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_THREAD_write_lock(global_engine_lock);
ref_exists = ((e->struct_ref > 0) ? 1 : 0);
CRYPTO_THREAD_unlock(global_engine_lock);
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) (void), int cmd_optional)
{
int num;
if (e == NULL || cmd_name == NULL) {
ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD, 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) > 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) {
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;
}
flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num, NULL, NULL);
if (flags < 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) > 0)
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) > 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)) {
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) > 0)
return 1;
return 0;
}