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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2021 OpenVPN Inc <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#include "syshead.h"
#if PROXY_DIGEST_AUTH
#include "crypto.h"
#include "httpdigest.h"
static void
CvtHex(
IN HASH Bin,
OUT HASHHEX Hex
)
{
unsigned short i;
unsigned char j;
for (i = 0; i < HASHLEN; i++)
{
j = (Bin[i] >> 4) & 0xf;
if (j <= 9)
{
Hex[i*2] = (j + '0');
}
else
{
Hex[i*2] = (j + 'a' - 10);
}
j = Bin[i] & 0xf;
if (j <= 9)
{
Hex[i*2+1] = (j + '0');
}
else
{
Hex[i*2+1] = (j + 'a' - 10);
}
}
Hex[HASHHEXLEN] = '\0';
}
/* calculate H(A1) as per spec */
void
DigestCalcHA1(
IN char *pszAlg,
IN char *pszUserName,
IN char *pszRealm,
IN char *pszPassword,
IN char *pszNonce,
IN char *pszCNonce,
OUT HASHHEX SessionKey
)
{
HASH HA1;
md_ctx_t *md5_ctx = md_ctx_new();
const md_kt_t *md5_kt = md_kt_get("MD5");
md_ctx_init(md5_ctx, md5_kt);
md_ctx_update(md5_ctx, (const uint8_t *) pszUserName, strlen(pszUserName));
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
md_ctx_update(md5_ctx, (const uint8_t *) pszRealm, strlen(pszRealm));
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
md_ctx_update(md5_ctx, (const uint8_t *) pszPassword, strlen(pszPassword));
md_ctx_final(md5_ctx, HA1);
if (pszAlg && strcasecmp(pszAlg, "md5-sess") == 0)
{
md_ctx_init(md5_ctx, md5_kt);
md_ctx_update(md5_ctx, HA1, HASHLEN);
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
md_ctx_update(md5_ctx, (const uint8_t *) pszNonce, strlen(pszNonce));
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
md_ctx_update(md5_ctx, (const uint8_t *) pszCNonce, strlen(pszCNonce));
md_ctx_final(md5_ctx, HA1);
}
md_ctx_cleanup(md5_ctx);
md_ctx_free(md5_ctx);
CvtHex(HA1, SessionKey);
}
/* calculate request-digest/response-digest as per HTTP Digest spec */
void
DigestCalcResponse(
IN HASHHEX HA1, /* H(A1) */
IN char *pszNonce, /* nonce from server */
IN char *pszNonceCount, /* 8 hex digits */
IN char *pszCNonce, /* client nonce */
IN char *pszQop, /* qop-value: "", "auth", "auth-int" */
IN char *pszMethod, /* method from the request */
IN char *pszDigestUri, /* requested URL */
IN HASHHEX HEntity, /* H(entity body) if qop="auth-int" */
OUT HASHHEX Response /* request-digest or response-digest */
)
{
HASH HA2;
HASH RespHash;
HASHHEX HA2Hex;
md_ctx_t *md5_ctx = md_ctx_new();
const md_kt_t *md5_kt = md_kt_get("MD5");
/* calculate H(A2) */
md_ctx_init(md5_ctx, md5_kt);
md_ctx_update(md5_ctx, (const uint8_t *) pszMethod, strlen(pszMethod));
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
md_ctx_update(md5_ctx, (const uint8_t *) pszDigestUri, strlen(pszDigestUri));
if (strcasecmp(pszQop, "auth-int") == 0)
{
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
md_ctx_update(md5_ctx, HEntity, HASHHEXLEN);
}
md_ctx_final(md5_ctx, HA2);
CvtHex(HA2, HA2Hex);
/* calculate response */
md_ctx_init(md5_ctx, md5_kt);
md_ctx_update(md5_ctx, HA1, HASHHEXLEN);
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
md_ctx_update(md5_ctx, (const uint8_t *) pszNonce, strlen(pszNonce));
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
if (*pszQop)
{
md_ctx_update(md5_ctx, (const uint8_t *) pszNonceCount, strlen(pszNonceCount));
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
md_ctx_update(md5_ctx, (const uint8_t *) pszCNonce, strlen(pszCNonce));
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
md_ctx_update(md5_ctx, (const uint8_t *) pszQop, strlen(pszQop));
md_ctx_update(md5_ctx, (const uint8_t *) ":", 1);
}
md_ctx_update(md5_ctx, HA2Hex, HASHHEXLEN);
md_ctx_final(md5_ctx, RespHash);
md_ctx_cleanup(md5_ctx);
md_ctx_free(md5_ctx);
CvtHex(RespHash, Response);
}
#endif /* if PROXY_DIGEST_AUTH */
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