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/* $NetBSD: mech.c,v 1.7 2011/02/22 05:45:05 joerg Exp $ */
/* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Mateusz Kocielski.
*
* 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 acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: mech.c,v 1.7 2011/02/22 05:45:05 joerg Exp $");
#include <sys/queue.h>
#include <saslc.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dict.h"
#include "error.h"
#include "mech.h"
#include "msg.h"
#include "saslc_private.h"
/* mechanisms */
__weakref_visible const saslc__mech_t weak_saslc__mech_anonymous
__weak_reference(saslc__mech_anonymous);
__weakref_visible const saslc__mech_t weak_saslc__mech_crammd5
__weak_reference(saslc__mech_crammd5);
__weakref_visible const saslc__mech_t weak_saslc__mech_digestmd5
__weak_reference(saslc__mech_digestmd5);
__weakref_visible const saslc__mech_t weak_saslc__mech_external
__weak_reference(saslc__mech_external);
__weakref_visible const saslc__mech_t weak_saslc__mech_gssapi
__weak_reference(saslc__mech_gssapi);
__weakref_visible const saslc__mech_t weak_saslc__mech_login
__weak_reference(saslc__mech_login);
__weakref_visible const saslc__mech_t weak_saslc__mech_plain
__weak_reference(saslc__mech_plain);
static const saslc__mech_t *saslc__mechanisms[] = {
&weak_saslc__mech_anonymous,
&weak_saslc__mech_crammd5,
&weak_saslc__mech_digestmd5,
&weak_saslc__mech_external,
&weak_saslc__mech_gssapi,
&weak_saslc__mech_login,
&weak_saslc__mech_plain,
};
/*
* This table is used by the inline functions in mech.h, which are
* used in mech_digestmd5.c and mech_gssapi.c.
*
* NB: This is indexed by saslc__mech_sess_qop_t values and must be
* NULL terminated for use in saslc__list_flags().
*/
const named_flag_t saslc__mech_qop_tbl[] = {
{ "auth", F_QOP_NONE },
{ "auth-int", F_QOP_INT },
{ "auth-conf", F_QOP_CONF },
{ NULL, 0 }
};
/**
* @brief creates a list of supported mechanisms and their resources.
* @param ctx context
* @return pointer to head of the list, NULL if allocation failed
*/
saslc__mech_list_t *
saslc__mech_list_create(saslc_t *ctx)
{
saslc__mech_list_t *head = NULL;
saslc__mech_list_node_t *node = NULL;
size_t i;
if ((head = calloc(1, sizeof(*head))) == NULL) {
saslc__error_set_errno(ERR(ctx), ERROR_NOMEM);
return NULL;
}
for (i = 0; i < __arraycount(saslc__mechanisms); i++) {
if (saslc__mechanisms[i] == NULL)
continue;
if ((node = calloc(1, sizeof(*node))) == NULL)
goto error;
if ((node->prop = saslc__dict_create()) == NULL) {
free(node);
goto error;
}
node->mech = saslc__mechanisms[i];
LIST_INSERT_HEAD(head, node, nodes);
}
return head;
error:
saslc__error_set_errno(ERR(ctx), ERROR_NOMEM);
saslc__mech_list_destroy(head);
return NULL;
}
/**
* @brief gets mechanism from the list using name
* @param list mechanisms list
* @param mech_name mechanism name
* @return pointer to the mechanism, NULL if mechanism was not found
*/
saslc__mech_list_node_t *
saslc__mech_list_get(saslc__mech_list_t *list, const char *mech_name)
{
saslc__mech_list_node_t *node;
LIST_FOREACH(node, list, nodes) {
if (strcasecmp(node->mech->name, mech_name) == 0)
return node;
}
return NULL;
}
/**
* @brief destroys and deallocates mechanism list
* @param list mechanisms list
*/
void
saslc__mech_list_destroy(saslc__mech_list_t *list)
{
saslc__mech_list_node_t *node;
while (!LIST_EMPTY(list)) {
node = LIST_FIRST(list);
LIST_REMOVE(node, nodes);
saslc__dict_destroy(node->prop);
free(node);
}
free(list);
}
/**
* @brief doing copy of the session property, on error sets
* error message for the session. Copied data is located in *out and *outlen
* @param sess sasl session
* @param out out buffer for the session property copy
* @param outlen length of the session property copy
* @param name name of the property
* @param error_msg error messages set on failure
* @return MECH_OK - on success
* MECH_ERROR - on failure
*/
int
saslc__mech_strdup(saslc_sess_t *sess, char **out, size_t *outlen,
const char *name, const char *error_msg)
{
const char *value; /* property value */
/* get value */
if ((value = saslc_sess_getprop(sess, name)) == NULL) {
saslc__error_set(ERR(sess), ERROR_MECH, error_msg);
return MECH_ERROR;
}
saslc__msg_dbg("saslc__mech_strdup: value='%s'\n", value);
/* copy value */
if ((*out = strdup(value)) == NULL) {
saslc__error_set_errno(ERR(sess), ERROR_NOMEM);
return MECH_ERROR;
}
if (outlen != NULL)
*outlen = strlen(value);
return MECH_OK;
}
/**
* @brief generic session create function, this
* function is suitable for the most mechanisms.
* @return 0 on success, -1 on failure
*/
int
saslc__mech_generic_create(saslc_sess_t *sess)
{
saslc__mech_sess_t *ms;
if ((ms = calloc(1, sizeof(*ms))) == NULL) {
saslc__error_set(ERR(sess), ERROR_NOMEM, NULL);
return -1;
}
sess->mech_sess = ms;
return 0;
}
/**
* @brief generic session destroy function, this
* function is suitable for the most mechanisms.
* @return function always returns 0
*/
int
saslc__mech_generic_destroy(saslc_sess_t *sess)
{
free(sess->mech_sess);
sess->mech_sess = NULL;
return 0;
}
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