mirror of
https://github.com/OpenVPN/openvpn.git
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6fbf66fad3
It includes the --topology feature, and TAP-Win32 driver changes to allow non-admin access. git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@580 e7ae566f-a301-0410-adde-c780ea21d3b5
189 lines
5.1 KiB
C
189 lines
5.1 KiB
C
/*
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* ntlm proxy support for OpenVPN
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*
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* Copyright (C) 2004 William Preston
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*
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* This program 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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* This program 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 (see the file COPYING included with this
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* distribution); if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef WIN32
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#include "config-win32.h"
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#else
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#include "config.h"
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#endif
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#include "syshead.h"
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#if NTLM
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#include "common.h"
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#include "buffer.h"
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#include "misc.h"
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#include "socket.h"
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#include "fdmisc.h"
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#include "proxy.h"
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#include "ntlm.h"
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#include "base64.h"
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#include "crypto.h"
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#include "memdbg.h"
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static void
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create_des_keys(const unsigned char *hash, unsigned char *key)
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{
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key[0] = hash[0];
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key[1] = ((hash[0]&1)<<7)|(hash[1]>>1);
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key[2] = ((hash[1]&3)<<6)|(hash[2]>>2);
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key[3] = ((hash[2]&7)<<5)|(hash[3]>>3);
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key[4] = ((hash[3]&15)<<4)|(hash[4]>>4);
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key[5] = ((hash[4]&31)<<3)|(hash[5]>>5);
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key[6] = ((hash[5]&63)<<2)|(hash[6]>>6);
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key[7] = ((hash[6]&127)<<1);
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des_set_odd_parity((des_cblock *)key);
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}
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static void
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gen_md4_hash (const char* data, int data_len, char *result)
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{
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/* result is 16 byte md4 hash */
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MD4_CTX c;
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char md[16];
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MD4_Init (&c);
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MD4_Update (&c, data, data_len);
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MD4_Final ((unsigned char *)md, &c);
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memcpy (result, md, 16);
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}
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static int
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unicodize (char *dst, const char *src)
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{
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/* not really unicode... */
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int i = 0;
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do
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{
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dst[i++] = *src;
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dst[i++] = 0;
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}
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while (*src++);
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return i;
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}
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const char *
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ntlm_phase_1 (const struct http_proxy_info *p, struct gc_arena *gc)
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{
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struct buffer out = alloc_buf_gc (96, gc);
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/* try a minimal NTLM handshake
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*
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* http://davenport.sourceforge.net/ntlm.html
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*
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* This message contains only the NTLMSSP signature,
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* the NTLM message type,
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* and the minimal set of flags (Negotiate NTLM and Negotiate OEM).
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*
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*/
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buf_printf (&out, "%s", "TlRMTVNTUAABAAAAAgIAAA==");
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return (BSTR (&out));
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}
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const char *
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ntlm_phase_3 (const struct http_proxy_info *p, const char *phase_2, struct gc_arena *gc)
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{
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char pwbuf[sizeof (p->up.password) * 2]; /* for unicode password */
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char buf2[128]; /* decoded reply from proxy */
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char phase3[146];
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char md4_hash[21];
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char challenge[8], response[24];
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int i, ret_val, buflen;
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des_cblock key1, key2, key3;
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des_key_schedule sched1, sched2, sched3;
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/* try a minimal NTLM handshake
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*
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* http://davenport.sourceforge.net/ntlm.html
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*
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*/
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ASSERT (strlen (p->up.username) > 0);
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ASSERT (strlen (p->up.password) > 0);
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/* fill 1st 16 bytes with md4 hash, disregard terminating null */
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gen_md4_hash (pwbuf, unicodize (pwbuf, p->up.password) - 2, md4_hash);
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/* pad to 21 bytes */
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memset (md4_hash + 16, 0, 5);
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ret_val = base64_decode( phase_2, (void *)buf2);
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/* we can be sure that phase_2 is less than 128
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* therefore buf2 needs to be (3/4 * 128) */
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/* extract the challenge from bytes 24-31 */
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for (i=0; i<8; i++)
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{
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challenge[i] = buf2[i+24];
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}
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create_des_keys ((unsigned char *)md4_hash, key1);
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des_set_key_unchecked ((des_cblock *)key1, sched1);
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des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)response, sched1, DES_ENCRYPT);
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create_des_keys ((unsigned char *)&(md4_hash[7]), key2);
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des_set_key_unchecked ((des_cblock *)key2, sched2);
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des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)&(response[8]), sched2, DES_ENCRYPT);
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create_des_keys ((unsigned char *)&(md4_hash[14]), key3);
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des_set_key_unchecked ((des_cblock *)key3, sched3);
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des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)&(response[16]), sched3, DES_ENCRYPT);
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/* clear reply */
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memset (phase3, 0, sizeof (phase3));
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strcpy (phase3, "NTLMSSP\0");
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phase3[8] = 3; /* type 3 */
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buflen = 0x58 + strlen (p->up.username);
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if (buflen > (int) sizeof (phase3))
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buflen = sizeof (phase3);
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phase3[0x10] = buflen; /* lm not used */
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phase3[0x20] = buflen; /* default domain (i.e. proxy's domain) */
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phase3[0x30] = buflen; /* no workstation name supplied */
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phase3[0x38] = buflen; /* no session key */
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phase3[0x14] = 24; /* ntlm response is 24 bytes long */
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phase3[0x16] = phase3[0x14];
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phase3[0x18] = 0x40; /* ntlm offset */
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memcpy (&(phase3[0x40]), response, 24);
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phase3[0x24] = strlen (p->up.username); /* username in ascii */
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phase3[0x26] = phase3[0x24];
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phase3[0x28] = 0x58;
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strncpy (&(phase3[0x58]), p->up.username, sizeof (phase3) - 0x58);
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phase3[0x3c] = 0x02; /* negotiate oem */
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phase3[0x3d] = 0x02; /* negotiate ntlm */
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return ((const char *)make_base64_string2 ((unsigned char *)phase3, buflen, gc));
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}
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#else
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static void dummy(void) {}
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#endif
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