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144 lines
3.5 KiB
144 lines
3.5 KiB
/*
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* Digest Authentication Module
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* Digest response calculation as per RFC2617
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*
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* Copyright (C) 2001-2003 FhG Fokus
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*
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* This file is part of Kamailio, a free SIP server.
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*
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* Kamailio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version
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*
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* Kamailio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include "rfc2617.h"
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#include "../../md5.h"
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#include "../../dprint.h"
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inline void cvt_hex(HASH _b, HASHHEX _h)
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{
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unsigned short i;
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unsigned char j;
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for (i = 0; i < HASHLEN; i++) {
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j = (_b[i] >> 4) & 0xf;
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if (j <= 9) {
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_h[i * 2] = (j + '0');
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} else {
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_h[i * 2] = (j + 'a' - 10);
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}
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j = _b[i] & 0xf;
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if (j <= 9) {
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_h[i * 2 + 1] = (j + '0');
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} else {
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_h[i * 2 + 1] = (j + 'a' - 10);
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}
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};
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_h[HASHHEXLEN] = '\0';
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}
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/*
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* calculate H(A1) as per spec
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*/
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void calc_HA1(ha_alg_t _alg, str* _username, str* _realm, str* _password,
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str* _nonce, str* _cnonce, HASHHEX _sess_key)
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{
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MD5_CTX Md5Ctx;
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HASH HA1;
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MD5Init(&Md5Ctx);
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MD5Update(&Md5Ctx, _username->s, _username->len);
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MD5Update(&Md5Ctx, ":", 1);
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MD5Update(&Md5Ctx, _realm->s, _realm->len);
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MD5Update(&Md5Ctx, ":", 1);
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MD5Update(&Md5Ctx, _password->s, _password->len);
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MD5Final(HA1, &Md5Ctx);
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if (_alg == HA_MD5_SESS) {
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MD5Init(&Md5Ctx);
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MD5Update(&Md5Ctx, HA1, HASHLEN);
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MD5Update(&Md5Ctx, ":", 1);
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MD5Update(&Md5Ctx, _nonce->s, _nonce->len);
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MD5Update(&Md5Ctx, ":", 1);
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MD5Update(&Md5Ctx, _cnonce->s, _cnonce->len);
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MD5Final(HA1, &Md5Ctx);
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};
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cvt_hex(HA1, _sess_key);
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}
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/*
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* calculate request-digest/response-digest as per HTTP Digest spec
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*/
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void calc_response(HASHHEX _ha1, /* H(A1) */
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str* _nonce, /* nonce from server */
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str* _nc, /* 8 hex digits */
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str* _cnonce, /* client nonce */
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str* _qop, /* qop-value: "", "auth", "auth-int" */
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int _auth_int, /* 1 if auth-int is used */
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str* _method, /* method from the request */
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str* _uri, /* requested URL */
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HASHHEX _hentity, /* H(entity body) if qop="auth-int" */
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HASHHEX _response) /* request-digest or response-digest */
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{
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MD5_CTX Md5Ctx;
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HASH HA2;
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HASH RespHash;
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HASHHEX HA2Hex;
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/* calculate H(A2) */
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MD5Init(&Md5Ctx);
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MD5Update(&Md5Ctx, _method->s, _method->len);
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MD5Update(&Md5Ctx, ":", 1);
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MD5Update(&Md5Ctx, _uri->s, _uri->len);
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if (_auth_int) {
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MD5Update(&Md5Ctx, ":", 1);
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MD5Update(&Md5Ctx, _hentity, HASHHEXLEN);
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};
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MD5Final(HA2, &Md5Ctx);
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cvt_hex(HA2, HA2Hex);
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/* calculate response */
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MD5Init(&Md5Ctx);
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MD5Update(&Md5Ctx, _ha1, HASHHEXLEN);
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MD5Update(&Md5Ctx, ":", 1);
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MD5Update(&Md5Ctx, _nonce->s, _nonce->len);
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MD5Update(&Md5Ctx, ":", 1);
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if (_qop->len) {
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MD5Update(&Md5Ctx, _nc->s, _nc->len);
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MD5Update(&Md5Ctx, ":", 1);
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MD5Update(&Md5Ctx, _cnonce->s, _cnonce->len);
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MD5Update(&Md5Ctx, ":", 1);
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MD5Update(&Md5Ctx, _qop->s, _qop->len);
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MD5Update(&Md5Ctx, ":", 1);
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};
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MD5Update(&Md5Ctx, HA2Hex, HASHHEXLEN);
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MD5Final(RespHash, &Md5Ctx);
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cvt_hex(RespHash, _response);
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}
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