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challenge.c
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challenge.c
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/*
* Challenge related functions
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of opensips, a free SIP server.
*
* opensips 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
*
* opensips 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* History:
* --------
* 2003-01-20 snprintf in build_auth_hf replaced with memcpy to avoid
* possible issues with too small buffer
* 2003-01-26 consume_credentials no longer complains about ACK/CANCEL(jiri)
* 2006-03-01 pseudo variables support for domain name (bogdan)
*/
#include "../../data_lump.h"
#include "../../mem/mem.h"
#include "../../parser/digest/digest.h"
#include "../../parser/digest/digest_parser.h"
#include "../../pvar.h"
#include "../../str.h"
#include "../../ut.h"
#include "../../lib/csv.h"
#include "../../mod_fix.h"
#include "auth_mod.h"
#include "common.h"
#include "challenge.h"
#include "../../lib/digest_auth/dauth_nonce.h"
#include "index.h"
#include "api.h"
#include "../../lib/dassert.h"
#include "../../lib/digest_auth/digest_auth.h"
#include "../../lib/digest_auth/dauth_calc.h"
/*
* proxy_challenge function sends this reply
*/
#define MESSAGE_407 "Proxy Authentication Required"
/*
* www_challenge function send this reply
*/
#define MESSAGE_401 "Unauthorized"
#define QOP_AUTH ", qop=\"" QOP_AUTH_STR "\""
#define QOP_AUTH_INT ", qop=\"" QOP_AUTHINT_STR "\""
#define QOP_AUTH_BOTH_AAI ", qop=\"" QOP_AUTH_STR "," QOP_AUTHINT_STR "\""
#define QOP_AUTH_BOTH_AIA ", qop=\"" QOP_AUTHINT_STR "," QOP_AUTH_STR "\""
#define STALE_PARAM ", stale=true"
#define DIGEST_REALM ": Digest realm=\""
#define DIGEST_NONCE "\", nonce=\""
#define DIGEST_ALGORITHM ", algorithm="
/*
* Create {WWW,Proxy}-Authenticate header field
*/
static inline char *build_auth_hf(int _retries, int _stale,
const str_const *_realm, int* _len, qop_type_t _qop, alg_t alg,
const str_const *alg_val, const str_const* _hf_name,
int index)
{
char *hf, *p;
str_const alg_param;
str_const qop_param = STR_NULL_const;
str_const stale_param = STR_NULL_const;
const str_const digest_realm = str_const_init(DIGEST_REALM);
const str_const nonce_param = str_const_init(DIGEST_NONCE);
struct nonce_params calc_np;
if (_qop) {
switch (_qop) {
case QOP_AUTH_D:
qop_param = str_const_init(QOP_AUTH);
break;
case QOP_AUTHINT_D:
qop_param = str_const_init(QOP_AUTH_INT);
break;
case QOP_AUTHINT_AUTH_D:
qop_param = str_const_init(QOP_AUTH_BOTH_AAI);
break;
case QOP_AUTH_AUTHINT_D:
qop_param = str_const_init(QOP_AUTH_BOTH_AIA);
break;
default:
LM_ERR("Wrong _qop value: %d\n", _qop);
abort();
}
}
if (_stale)
stale_param = str_const_init(STALE_PARAM);
/* length calculation */
*_len=_hf_name->len;
*_len+=digest_realm.len
+_realm->len
+nonce_param.len
+ncp->nonce_len
+1 /* '"' */
+stale_param.len
+qop_param.len
+CRLF_LEN ;
if (alg_val != NULL) {
alg_param = str_const_init(DIGEST_ALGORITHM);
*_len += alg_param.len + alg_val->len;
}
p=hf=pkg_malloc(*_len+1);
if (!hf) {
LM_ERR("no pkg memory left\n");
goto e1;
}
memcpy(p, _hf_name->s, _hf_name->len); p+=_hf_name->len;
memcpy(p, digest_realm.s, digest_realm.len);p+=digest_realm.len;
memcpy(p, _realm->s, _realm->len);p+=_realm->len;
memcpy(p, nonce_param.s, nonce_param.len);p+=nonce_param.len;
if (clock_gettime(CLOCK_REALTIME, &calc_np.expires) != 0) {
LM_ERR("clock_gettime failed\n");
goto e2;
}
calc_np.expires.tv_sec += nonce_expire;
calc_np.index = index;
calc_np.qop = _qop;
calc_np.alg = (alg == ALG_UNSPEC) ? ALG_MD5 : alg;
if (calc_nonce(ncp, p, &calc_np) != 0) {
LM_ERR("calc_nonce failed\n");
goto e2;
}
p+=ncp->nonce_len;
*p='"';p++;
if (_qop) {
memcpy(p, qop_param.s, qop_param.len);
p+=qop_param.len;
}
if (_stale) {
memcpy(p, stale_param.s, stale_param.len);
p+=stale_param.len;
}
if (alg_val != NULL) {
memcpy(p, alg_param.s, alg_param.len);
p += alg_param.len;
memcpy(p, alg_val->s, alg_val->len);
p += alg_val->len;
}
memcpy(p, CRLF, CRLF_LEN ); p+=CRLF_LEN;
*p=0; /* zero terminator, just in case */
LM_DBG("'%s'\n", hf);
return hf;
e2:
pkg_free(hf);
e1:
*_len=0;
return NULL;
}
/*
* Create and send a challenge
*/
static inline int challenge(struct sip_msg* _msg, str *realm, qop_type_t _qop,
int _code, const str *reason, const str_const *_challenge_msg, int algmask)
{
struct hdr_field* h = NULL;
auth_body_t* cred = 0;
int i, ret, nalgs, index = 0;
hdr_types_t hftype = 0; /* Makes gcc happy */
struct sip_uri *uri;
str auth_hfs[LAST_ALG_SPTD - FIRST_ALG_SPTD + 1];
const str_const *alg_val;
const struct digest_auth_calc *digest_calc;
switch(_code) {
case WWW_AUTH_CODE:
get_authorized_cred(_msg->authorization, &h);
hftype = HDR_AUTHORIZATION_T;
break;
case PROXY_AUTH_CODE:
get_authorized_cred(_msg->proxy_auth, &h);
hftype = HDR_PROXYAUTH_T;
break;
}
if (h) cred = (auth_body_t*)(h->parsed);
if (realm->len == 0) {
if (get_realm(_msg, hftype, &uri) < 0) {
LM_ERR("failed to extract URI\n");
if (send_resp(_msg, 400, &str_init(MESSAGE_400), NULL, 0) == -1) {
LM_ERR("failed to send the response\n");
return -1;
}
return 0;
}
realm = &uri->host;
strip_realm(realm);
}
nalgs = 0;
if (algmask >= ALG_MD5SESS && _qop == QOP_UNSPEC_D) {
/* RFC8760 algos and XYZ-sess mandates QOP */
_qop = QOP_AUTH_D;
}
if(!disable_nonce_check) {
/* get the nonce index and mark it as used */
index= reserve_nonce_index();
if(index == -1)
{
LM_ERR("no more nonces can be generated\n");
return -1;
}
LM_DBG("nonce index= %d\n", index);
}
for (i = LAST_ALG_SPTD; i >= FIRST_ALG_SPTD; i--) {
if ((algmask & ALG2ALGFLG(i)) == 0)
continue;
digest_calc = get_digest_calc(i);
if (digest_calc == NULL)
continue;
alg_val = (i == ALG_UNSPEC) ? NULL : &digest_calc->algorithm_val;
auth_hfs[nalgs].s = build_auth_hf(0, (cred ? cred->stale : 0),
str2const(realm), &auth_hfs[nalgs].len, _qop, i, alg_val,
_challenge_msg, index);
if (!auth_hfs[nalgs].s) {
LM_ERR("failed to generate nonce\n");
ret = -1;
goto failure;
}
nalgs += 1;
}
DASSERT(nalgs > 0);
ret = send_resp(_msg, _code, reason, auth_hfs, nalgs);
failure:
for (i = 0; i < nalgs; i++) {
if (auth_hfs[i].s) pkg_free(auth_hfs[i].s);
}
if (ret == -1) {
LM_ERR("failed to send the response\n");
return -1;
}
return 0;
}
int fixup_qop(void** param)
{
str *s = (str*)*param;
qop_type_t qop_type = QOP_UNSPEC_D;
csv_record *q_csv, *q;
q_csv = parse_csv_record(s);
if (!q_csv) {
LM_ERR("Failed to parse qop types\n");
return -1;
}
for (q = q_csv; q; q = q->next) {
if (!str_strcmp(&q->s, const_str(QOP_AUTH_STR))) {
if (qop_type == QOP_AUTHINT_D)
qop_type = QOP_AUTHINT_AUTH_D;
else
qop_type = QOP_AUTH_D;
} else if (!str_strcmp(&q->s, const_str(QOP_AUTHINT_STR))) {
if (qop_type == QOP_AUTH_D)
qop_type = QOP_AUTH_AUTHINT_D;
else
qop_type = QOP_AUTHINT_D;
} else {
LM_ERR("Bad qop type\n");
free_csv_record(q_csv);
return -1;
}
}
free_csv_record(q_csv);
*param=(void*)(long)qop_type;
return 0;
}
/*
* Challenge a user to send credentials using WWW-Authorize header field
*/
int www_challenge(struct sip_msg* _msg, str* _realm, void* _qop,
intptr_t algmask)
{
return challenge(_msg, _realm, (qop_type_t)(long)_qop, WWW_AUTH_CODE,
&str_init(MESSAGE_401), &str_const_init(WWW_AUTH_HDR),
algmask ? algmask : ALGFLG_UNSPEC);
}
/*
* Challenge a user to send credentials using Proxy-Authorize header field
*/
int proxy_challenge(struct sip_msg* _msg, str* _realm, void* _qop,
intptr_t algmask)
{
return challenge(_msg, _realm, (qop_type_t)(long)_qop, PROXY_AUTH_CODE,
&str_init(MESSAGE_407), &str_const_init(PROXY_AUTH_HDR),
algmask ? algmask : ALGFLG_UNSPEC);
}
/*
* Remove used credentials from a SIP message header
*/
int consume_credentials(struct sip_msg* _m, char* _s1, char* _s2)
{
struct hdr_field* h;
int len;
get_authorized_cred(_m->authorization, &h);
if (!h) {
get_authorized_cred(_m->proxy_auth, &h);
if (!h) {
if (_m->REQ_METHOD!=METHOD_ACK
&& _m->REQ_METHOD!=METHOD_CANCEL) {
LM_ERR("no authorized credentials found (error in scripts)\n");
}
return -1;
}
}
len=h->len;
if (del_lump(_m, h->name.s - _m->buf, len, 0) == 0) {
LM_ERR("can't remove credentials\n");
return -1;
}
return 1;
}