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/* $Id: sip_auth_server.c 3553 2011-05-05 06:14:19Z nanang $ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pjsip/sip_auth.h>
#include <pjsip/sip_auth_parser.h> /* just to get pjsip_DIGEST_STR */
#include <pjsip/sip_auth_msg.h>
#include <pjsip/sip_errno.h>
#include <pjsip/sip_transport.h>
#include <pj/string.h>
#include <pj/assert.h>
/*
* Initialize server authorization session data structure to serve the
* specified realm and to use lookup_func function to look for the credential
* info.
*/
PJ_DEF(pj_status_t) pjsip_auth_srv_init( pj_pool_t *pool,
pjsip_auth_srv *auth_srv,
const pj_str_t *realm,
pjsip_auth_lookup_cred *lookup,
unsigned options )
{
PJ_ASSERT_RETURN(pool && auth_srv && realm && lookup, PJ_EINVAL);
pj_strdup( pool, &auth_srv->realm, realm);
auth_srv->lookup = lookup;
auth_srv->is_proxy = (options & PJSIP_AUTH_SRV_IS_PROXY);
return PJ_SUCCESS;
}
/* Verify incoming Authorization/Proxy-Authorization header against the
* specified credential.
*/
static pj_status_t pjsip_auth_verify( const pjsip_authorization_hdr *hdr,
const pj_str_t *method,
const pjsip_cred_info *cred_info )
{
if (pj_stricmp(&hdr->scheme, &pjsip_DIGEST_STR) == 0) {
char digest_buf[PJSIP_MD5STRLEN];
pj_str_t digest;
const pjsip_digest_credential *dig = &hdr->credential.digest;
/* Check that username and realm match.
* These checks should have been performed before entering this
* function.
*/
PJ_ASSERT_RETURN(pj_strcmp(&dig->username, &cred_info->username) == 0,
PJ_EINVALIDOP);
PJ_ASSERT_RETURN(pj_strcmp(&dig->realm, &cred_info->realm) == 0,
PJ_EINVALIDOP);
/* Prepare for our digest calculation. */
digest.ptr = digest_buf;
digest.slen = PJSIP_MD5STRLEN;
/* Create digest for comparison. */
pjsip_auth_create_digest(&digest,
&hdr->credential.digest.nonce,
&hdr->credential.digest.nc,
&hdr->credential.digest.cnonce,
&hdr->credential.digest.qop,
&hdr->credential.digest.uri,
&cred_info->realm,
cred_info,
method );
/* Compare digest. */
return (pj_stricmp(&digest, &hdr->credential.digest.response) == 0) ?
PJ_SUCCESS : PJSIP_EAUTHINVALIDDIGEST;
} else {
pj_assert(!"Unsupported authentication scheme");
return PJSIP_EINVALIDAUTHSCHEME;
}
}
/*
* Request the authorization server framework to verify the authorization
* information in the specified request in rdata.
*/
PJ_DEF(pj_status_t) pjsip_auth_srv_verify( pjsip_auth_srv *auth_srv,
pjsip_rx_data *rdata,
int *status_code)
{
pjsip_authorization_hdr *h_auth;
pjsip_msg *msg = rdata->msg_info.msg;
pjsip_hdr_e htype;
pj_str_t acc_name;
pjsip_cred_info cred_info;
pj_status_t status;
PJ_ASSERT_RETURN(auth_srv && rdata, PJ_EINVAL);
PJ_ASSERT_RETURN(msg->type == PJSIP_REQUEST_MSG, PJSIP_ENOTREQUESTMSG);
htype = auth_srv->is_proxy ? PJSIP_H_PROXY_AUTHORIZATION :
PJSIP_H_AUTHORIZATION;
/* Initialize status with 200. */
*status_code = 200;
/* Find authorization header for our realm. */
h_auth = (pjsip_authorization_hdr*) pjsip_msg_find_hdr(msg, htype, NULL);
while (h_auth) {
if (!pj_stricmp(&h_auth->credential.common.realm, &auth_srv->realm))
break;
h_auth = h_auth->next;
if (h_auth == (void*) &msg->hdr) {
h_auth = NULL;
break;
}
h_auth=(pjsip_authorization_hdr*)pjsip_msg_find_hdr(msg,htype,h_auth);
}
if (!h_auth) {
*status_code = auth_srv->is_proxy ? 407 : 401;
return PJSIP_EAUTHNOAUTH;
}
/* Check authorization scheme. */
if (pj_stricmp(&h_auth->scheme, &pjsip_DIGEST_STR) == 0)
acc_name = h_auth->credential.digest.username;
else {
*status_code = auth_srv->is_proxy ? 407 : 401;
return PJSIP_EINVALIDAUTHSCHEME;
}
/* Find the credential information for the account. */
status = (*auth_srv->lookup)(rdata->tp_info.pool, &auth_srv->realm,
&acc_name, &cred_info);
if (status != PJ_SUCCESS) {
*status_code = PJSIP_SC_FORBIDDEN;
return status;
}
/* Authenticate with the specified credential. */
status = pjsip_auth_verify(h_auth, &msg->line.req.method.name,
&cred_info);
if (status != PJ_SUCCESS) {
*status_code = PJSIP_SC_FORBIDDEN;
}
return status;
}
/*
* Add authentication challenge headers to the outgoing response in tdata.
* Application may specify its customized nonce and opaque for the challenge,
* or can leave the value to NULL to make the function fills them in with
* random characters.
*/
PJ_DEF(pj_status_t) pjsip_auth_srv_challenge( pjsip_auth_srv *auth_srv,
const pj_str_t *qop,
const pj_str_t *nonce,
const pj_str_t *opaque,
pj_bool_t stale,
pjsip_tx_data *tdata)
{
pjsip_www_authenticate_hdr *hdr;
char nonce_buf[16];
pj_str_t random;
PJ_ASSERT_RETURN( auth_srv && tdata, PJ_EINVAL );
random.ptr = nonce_buf;
random.slen = sizeof(nonce_buf);
/* Create the header. */
if (auth_srv->is_proxy)
hdr = pjsip_proxy_authenticate_hdr_create(tdata->pool);
else
hdr = pjsip_www_authenticate_hdr_create(tdata->pool);
/* Initialize header.
* Note: only support digest authentication now.
*/
hdr->scheme = pjsip_DIGEST_STR;
hdr->challenge.digest.algorithm = pjsip_MD5_STR;
if (nonce) {
pj_strdup(tdata->pool, &hdr->challenge.digest.nonce, nonce);
} else {
pj_create_random_string(nonce_buf, sizeof(nonce_buf));
pj_strdup(tdata->pool, &hdr->challenge.digest.nonce, &random);
}
if (opaque) {
pj_strdup(tdata->pool, &hdr->challenge.digest.opaque, opaque);
} else {
pj_create_random_string(nonce_buf, sizeof(nonce_buf));
pj_strdup(tdata->pool, &hdr->challenge.digest.opaque, &random);
}
if (qop) {
pj_strdup(tdata->pool, &hdr->challenge.digest.qop, qop);
} else {
hdr->challenge.digest.qop.slen = 0;
}
pj_strdup(tdata->pool, &hdr->challenge.digest.realm, &auth_srv->realm);
hdr->challenge.digest.stale = stale;
pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr*)hdr);
return PJ_SUCCESS;
}
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