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/* $Id$ */
/*
* Copyright (C) 2003-2007 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_aka.h>
#include <pjsip/sip_errno.h>
#include <pjlib-util/base64.h>
#include <pjlib-util/md5.h>
#include <pj/assert.h>
#include <pj/log.h>
#include <pj/pool.h>
#include <pj/string.h>
#include "../../third_party/milenage/milenage.h"
/*
* Create MD5-AKA1 digest response.
*/
PJ_DEF(pj_status_t) pjsip_auth_create_akav1( pj_pool_t *pool,
const pjsip_digest_challenge*chal,
const pjsip_cred_info *cred,
const pj_str_t *method,
pjsip_digest_credential *auth)
{
pj_str_t nonce_bin;
pj_uint8_t *chal_rand, *chal_autn, *chal_mac;
pj_uint8_t res[PJSIP_AKA_RESLEN];
pj_uint8_t ck[PJSIP_AKA_CKLEN];
pj_uint8_t ik[PJSIP_AKA_IKLEN];
pj_uint8_t ak[PJSIP_AKA_AKLEN];
pj_uint8_t sqn[PJSIP_AKA_AUTNLEN];
pj_uint8_t xmac[PJSIP_AKA_MACLEN];
pjsip_cred_info aka_cred;
int i;
pj_status_t status;
/* Check the algorithm is supported. */
if (pj_stricmp2(&chal->algorithm, "md5") == 0) {
pjsip_auth_create_digest(&auth->response, &auth->nonce, &auth->nc,
&auth->cnonce, &auth->qop, &auth->uri,
&auth->realm, cred, method);
return PJ_SUCCESS;
} else if (pj_stricmp2(&chal->algorithm, "AKAv1-MD5") != 0) {
/* Unsupported algorithm */
return PJSIP_EINVALIDALGORITHM;
}
/* Decode nonce */
nonce_bin.slen = PJ_BASE64_TO_BASE256_LEN(chal->nonce.slen);
nonce_bin.ptr = pj_pool_alloc(pool, nonce_bin.slen + 1);
status = pj_base64_decode(&chal->nonce, (pj_uint8_t*)nonce_bin.ptr,
&nonce_bin.slen);
if (status != PJ_SUCCESS)
return PJSIP_EAUTHINNONCE;
if (nonce_bin.slen < PJSIP_AKA_RANDLEN + PJSIP_AKA_AUTNLEN + PJSIP_AKA_MACLEN)
return PJSIP_EAUTHINNONCE;
/* Get RAND, AUTN, and MAC */
chal_rand = (pj_uint8_t*) (nonce_bin.ptr + 0);
chal_autn = (pj_uint8_t*) (nonce_bin.ptr + PJSIP_AKA_RANDLEN);
chal_mac = (pj_uint8_t*) (nonce_bin.ptr + PJSIP_AKA_RANDLEN + PJSIP_AKA_AUTNLEN);
/* Verify credential */
PJ_ASSERT_RETURN(cred->ext.aka.k.slen == PJSIP_AKA_KLEN, PJSIP_EAUTHINAKACRED);
PJ_ASSERT_RETURN(cred->ext.aka.op.slen == PJSIP_AKA_OPLEN, PJSIP_EAUTHINAKACRED);
/* Given key K and random challenge RAND, compute response RES,
* confidentiality key CK, integrity key IK and anonymity key AK.
*/
f2345((pj_uint8_t*)cred->ext.aka.k.ptr,
chal_rand,
res, ck, ik, ak,
(pj_uint8_t*)cred->ext.aka.op.ptr);
/* Compute sequence number SQN */
for (i=0; i<PJSIP_AKA_AUTNLEN; ++i)
sqn[i] = (pj_uint8_t) (chal_autn[i] ^ ak[i]);
/* Compute XMAC */
f1((pj_uint8_t*)cred->ext.aka.k.ptr, chal_rand, sqn,
(pj_uint8_t*)cred->ext.aka.amf.ptr, xmac,
(pj_uint8_t*)cred->ext.aka.op.ptr);
/* Verify MAC in the challenge */
if (pj_memcmp(chal_mac, xmac, PJSIP_AKA_MACLEN) != 0) {
return PJSIP_EAUTHINNONCE;
}
/* Build a temporary credential info to create MD5 digest, using
* "res" as the password.
*/
pj_memcpy(&aka_cred, cred, sizeof(aka_cred));
aka_cred.data_type = PJSIP_CRED_DATA_PLAIN_PASSWD;
aka_cred.data.ptr = (char*)res;
aka_cred.data.slen = PJSIP_AKA_RESLEN;
/* Create a response */
pjsip_auth_create_digest(&auth->response, &chal->nonce,
&auth->nc, &auth->cnonce, &auth->qop, &auth->uri,
&chal->realm, &aka_cred, method);
/* Done */
return PJ_SUCCESS;
}
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