/*
* $Id: sterman.c 1561 2007-02-01 15:41:07Z bogdan_iancu $
*
* Digest Authentication - Radius support
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of openser, a free SIP server.
*
* openser 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
*
* openser 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
*
* History:
* -------
* 2003-03-09: Based on digest.c from radius_auth module (janakj)
* 2005-07-08: Radius AVP may contain any kind of OpenSER AVP - ID/name or
* int/str value (bogdan)
* 2005-07-08: old RPID RADIUS AVP compatibility droped (bogdan)
*/
#include "../../mem/mem.h"
#include "../../dprint.h"
#include "../../usr_avp.h"
#include "../../radius.h"
#include "../../ut.h"
#include "../auth/api.h"
#include "sterman.h"
#include "authrad_mod.h"
#include <stdlib.h>
#include <string.h>
static inline int extract_avp(VALUE_PAIR* vp, unsigned short *flags,
int_str *name, int_str *value)
{
static str names, values;
unsigned int r;
char *p;
char *end;
/* empty? */
if (vp->lvalue==0 || vp->strvalue==0)
goto error;
p = vp->strvalue;
end = vp->strvalue + vp->lvalue;
DBG("DEBUG:auth_radius:extract_avp: string is <%.*s>\n",
(int)(long)(end-p), p);
/* get name */
if (*p!='#') {
/* name AVP */
*flags |= AVP_NAME_STR;
names.s = p;
} else {
names.s = ++p;
}
names.len = 0;
while( p<end && *p!=':' && *p!='#')
p++;
if (names.s==p || p==end) {
LOG(L_ERR,"ERROR:auth_radius:extract_avp: empty AVP name\n");
goto error;
}
names.len = p - names.s;
DBG("DEBUG:auth_radius:extract_avp: AVP name is <%.*s>\n",
names.len, names.s);
/* get value */
if (*p!='#') {
/* string value */
*flags |= AVP_VAL_STR;
}
values.s = ++p;
values.len = end-values.s;
if (values.len==0) {
LOG(L_ERR,"ERROR:auth_radius:extract_avp: empty AVP value\n");
goto error;
}
DBG("DEBUG:auth_radius:extract_avp: AVP val is <%.*s>\n",
values.len, values.s);
if ( !((*flags)&AVP_NAME_STR) ) {
/* convert name to id*/
if (str2int(&names,&r)!=0 ) {
LOG(L_ERR,"ERROR:auth_radius:extract_avp: invalid AVP ID '%.*s'\n",
names.len,names.s);
goto error;
}
name->n = (int)r;
} else {
name->s = names;
}
if ( !((*flags)&AVP_VAL_STR) ) {
/* convert value to integer */
if (str2int(&values,&r)!=0 ) {
LOG(L_ERR,"ERROR:auth_radius:extract_avp: invalid AVP numrical "
"value '%.*s'\n", values.len,values.s);
goto error;
}
value->n = (int)r;
} else {
value->s = values;
}
return 0;
error:
return -1;
}
/*
* Generate AVPs from the database result
*/
static int generate_avps(VALUE_PAIR* received)
{
int_str name, val;
unsigned short flags;
VALUE_PAIR *vp;
vp = received;
DBG("DEBUG:auth_radius:generate_avps: getting SIP AVPs from avpair %d\n",
attrs[A_SIP_AVP].v);
for( ; (vp=rc_avpair_get(vp,attrs[A_SIP_AVP].v,0)) ; vp=vp->next) {
flags = 0;
if (extract_avp( vp, &flags, &name, &val)!=0 )
continue;
if (add_avp( flags, name, val) < 0) {
LOG(L_ERR, "ERROR:auth_radius:generate_avps: Unable to create "
"a new AVP\n");
} else {
DBG("DEBUG:auth_radius:generate_avps: "
"AVP '%.*s'/%d='%.*s'/%d has been added\n",
(flags&AVP_NAME_STR)?name.s.len:4,
(flags&AVP_NAME_STR)?name.s.s:"null",
(flags&AVP_NAME_STR)?0:name.n,
(flags&AVP_VAL_STR)?val.s.len:4,
(flags&AVP_VAL_STR)?val.s.s:"null",
(flags&AVP_VAL_STR)?0:val.n );
}
}
return 0;
}
static int add_cisco_vsa(VALUE_PAIR** send, struct sip_msg* msg)
{
str callid;
if (!msg->callid && parse_headers(msg, HDR_CALLID_F, 0) == -1) {
LOG(L_ERR, "ERROR:auth_radius:add_cisco_vsa: Cannot parse "
"Call-ID header field\n");
return -1;
}
if (!msg->callid) {
LOG(L_ERR, "ERROR:auth_radius:add_cisco_vsa: Call-ID header "
"field not found\n");
return -1;
}
callid.len = msg->callid->body.len + 8;
callid.s = pkg_malloc(callid.len);
if (callid.s == NULL) {
LOG(L_ERR, "ERROR:auth_radius:add_cisco_vsa: No pkg memory left\n");
return -1;
}
memcpy(callid.s, "call-id=", 8);
memcpy(callid.s + 8, msg->callid->body.s, msg->callid->body.len);
if (rc_avpair_add(rh, send, attrs[A_CISCO_AVPAIR].v, callid.s,
callid.len, VENDOR(attrs[A_CISCO_AVPAIR].v)) == 0) {
LOG(L_ERR, "ERROR:auth_radius:add_cisco_vsa: Unable to add "
"Cisco-AVPair attribute\n");
pkg_free(callid.s);
return -1;
}
pkg_free(callid.s);
return 0;
}
/*
* This function creates and submits radius authentication request as per
* draft-sterman-aaa-sip-00.txt. In addition, _user parameter is included
* in the request as value of a SER specific attribute type SIP-URI-User,
* which can be be used as a check item in the request. Service type of
* the request is Authenticate-Only.
*/
int radius_authorize_sterman(struct sip_msg* _msg, dig_cred_t* _cred, str* _method, str* _user)
{
static char msg[4096];
VALUE_PAIR *send, *received;
UINT4 service;
str method, user, user_name;
int i;
send = received = 0;
if (!(_cred && _method && _user)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: "
"Invalid parameter value\n");
return -1;
}
method = *_method;
user = *_user;
/*
* Add all the user digest parameters according to the qop defined.
* Most devices tested only offer support for the simplest digest.
*/
if (_cred->username.domain.len) {
if (!rc_avpair_add(rh, &send, attrs[A_USER_NAME].v, _cred->username.whole.s, _cred->username.whole.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add User-Name attribute\n");
goto err;
}
} else {
user_name.len = _cred->username.user.len + _cred->realm.len + 1;
user_name.s = pkg_malloc(user_name.len);
if (!user_name.s) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: "
"No pkg memory left\n");
return -3;
}
memcpy(user_name.s, _cred->username.whole.s, _cred->username.whole.len);
user_name.s[_cred->username.whole.len] = '@';
memcpy(user_name.s + _cred->username.whole.len + 1, _cred->realm.s,
_cred->realm.len);
if (!rc_avpair_add(rh, &send, attrs[A_USER_NAME].v, user_name.s,
user_name.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: "
"Unable to add User-Name attribute\n");
pkg_free(user_name.s);
goto err;
}
pkg_free(user_name.s);
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_USER_NAME].v,
_cred->username.whole.s, _cred->username.whole.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: "
"Unable to add Digest-User-Name attribute\n");
goto err;
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_REALM].v, _cred->realm.s,
_cred->realm.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-Realm attribute\n");
goto err;
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_NONCE].v, _cred->nonce.s,
_cred->nonce.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-Nonce attribute\n");
goto err;
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_URI].v, _cred->uri.s,
_cred->uri.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-URI attribute\n");
goto err;
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_METHOD].v, method.s,
method.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-Method attribute\n");
goto err;
}
/*
* Add the additional authentication fields according to the QOP.
*/
if (_cred->qop.qop_parsed == QOP_AUTH) {
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_QOP].v, "auth", 4, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: "
"Unable to add Digest-QOP attribute\n");
goto err;
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_NONCE_COUNT].v,
_cred->nc.s, _cred->nc.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-CNonce-Count attribute\n");
goto err;
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_CNONCE].v,
_cred->cnonce.s, _cred->cnonce.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-CNonce attribute\n");
goto err;
}
} else if (_cred->qop.qop_parsed == QOP_AUTHINT) {
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_QOP].v,
"auth-int", 8, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-QOP attribute\n");
goto err;
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_NONCE_COUNT].v,
_cred->nc.s, _cred->nc.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-Nonce-Count attribute\n");
goto err;
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_CNONCE].v,
_cred->cnonce.s, _cred->cnonce.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-CNonce attribute\n");
goto err;
}
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_BODY_DIGEST].v,
_cred->opaque.s, _cred->opaque.len, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable "
"to add Digest-Body-Digest attribute\n");
goto err;
}
} else {
/* send nothing for qop == "" */
}
/* Add the response... What to calculate against... */
if (!rc_avpair_add(rh, &send, attrs[A_DIGEST_RESPONSE].v,
_cred->response.s, _cred->response.len, 0)) {
LOG(L_ERR, "sterman(): Unable to add Digest-Response attribute\n");
goto err;
}
/* Indicate the service type, Authenticate only in our case */
service = vals[V_SIP_SESSION].v;
if (!rc_avpair_add(rh, &send, attrs[A_SERVICE_TYPE].v, &service, -1, 0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable to "
"add Service-Type attribute\n");
goto err;
}
/* Add SIP URI as a check item */
if (!rc_avpair_add(rh,&send,attrs[A_SIP_URI_USER].v,user.s,user.len,0)) {
LOG(L_ERR, "ERROR:auth_radius:radius_authorize_sterman: Unable to "
"add Sip-URI-User attribute\n");
goto err;
}
if (attrs[A_CISCO_AVPAIR].n != NULL) {
if (add_cisco_vsa(&send, _msg)) {
goto err;
}
}
/* Send request */
if ((i = rc_auth(rh, SIP_PORT, send, &received, msg)) == OK_RC) {
DBG("DEBUG:auth_radius:radius_authorize_sterman: Success\n");
rc_avpair_free(send);
send = 0;
generate_avps(received);
rc_avpair_free(received);
return 1;
} else {
LOG(L_ERR,"ERROR:auth_radius:radius_authorize_sterman: "
"rc_auth failed\n");
goto err;
}
err:
if (send) rc_avpair_free(send);
if (received) rc_avpair_free(received);
return -1;
}
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