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-rw-r--r--ntlm.c353
1 files changed, 0 insertions, 353 deletions
diff --git a/ntlm.c b/ntlm.c
deleted file mode 100644
index 0453358..0000000
--- a/ntlm.c
+++ /dev/null
@@ -1,353 +0,0 @@
-/*
- * ntlm proxy support for OpenVPN
- *
- * Copyright (C) 2004 William Preston
- *
- * *NTLMv2 support and domain name parsing by Miroslav Zajic, Nextsoft s.r.o.*
- *
- * 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 (see the file COPYING included with this
- * distribution); if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include "syshead.h"
-
-#if NTLM
-
-#include "common.h"
-#include "buffer.h"
-#include "misc.h"
-#include "socket.h"
-#include "fdmisc.h"
-#include "proxy.h"
-#include "ntlm.h"
-#include "base64.h"
-#include "crypto.h"
-
-#include "memdbg.h"
-
-
-/* 64bit datatype macros */
-#ifdef _MSC_VER
- /* MS compilers */
-# define UINTEGER64 __int64
-# define UINT64(c) c ## Ui64
-#else
- /* Non MS compilers */
-# define UINTEGER64 unsigned long long
-# define UINT64(c) c ## LL
-#endif
-
-
-
-
-static void
-create_des_keys(const unsigned char *hash, unsigned char *key)
-{
- key[0] = hash[0];
- key[1] = ((hash[0]&1)<<7)|(hash[1]>>1);
- key[2] = ((hash[1]&3)<<6)|(hash[2]>>2);
- key[3] = ((hash[2]&7)<<5)|(hash[3]>>3);
- key[4] = ((hash[3]&15)<<4)|(hash[4]>>4);
- key[5] = ((hash[4]&31)<<3)|(hash[5]>>5);
- key[6] = ((hash[5]&63)<<2)|(hash[6]>>6);
- key[7] = ((hash[6]&127)<<1);
- des_set_odd_parity((des_cblock *)key);
-}
-
-static void
-gen_md4_hash (const char* data, int data_len, char *result)
-{
- /* result is 16 byte md4 hash */
-
- MD4_CTX c;
- char md[16];
-
- MD4_Init (&c);
- MD4_Update (&c, data, data_len);
- MD4_Final ((unsigned char *)md, &c);
-
- memcpy (result, md, 16);
-}
-
-static void
-gen_hmac_md5 (const char* data, int data_len, const char* key, int key_len,char *result)
-{
- unsigned int len;
-
- HMAC_CTX c;
- HMAC_Init (&c, key, key_len, EVP_md5());
- HMAC_Update (&c, (const unsigned char *)data, data_len);
- HMAC_Final (&c, (unsigned char *)result, &len);
- HMAC_CTX_cleanup(&c);
-}
-
-static void
-gen_timestamp (unsigned char *timestamp)
-{
- /* Copies 8 bytes long timestamp into "timestamp" buffer.
- * Timestamp is Little-endian, 64-bit signed value representing the number of tenths of a microsecond since January 1, 1601.
- */
-
- UINTEGER64 timestamp_ull;
-
- timestamp_ull = openvpn_time(NULL);
- timestamp_ull = (timestamp_ull + UINT64(11644473600)) * UINT64(10000000);
-
- /* store little endian value */
- timestamp[0]= timestamp_ull & UINT64(0xFF);
- timestamp[1]= (timestamp_ull >> 8) & UINT64(0xFF);
- timestamp[2]= (timestamp_ull >> 16) & UINT64(0xFF);
- timestamp[3]= (timestamp_ull >> 24) & UINT64(0xFF);
- timestamp[4]= (timestamp_ull >> 32) & UINT64(0xFF);
- timestamp[5]= (timestamp_ull >> 40) & UINT64(0xFF);
- timestamp[6]= (timestamp_ull >> 48) & UINT64(0xFF);
- timestamp[7]= (timestamp_ull >> 56) & UINT64(0xFF);
-}
-
-static void
-gen_nonce (unsigned char *nonce)
-{
- /* Generates 8 random bytes to be used as client nonce */
- int i;
-
- for(i=0;i<8;i++){
- nonce[i] = (unsigned char)get_random();
- }
-}
-
-unsigned char *my_strupr(unsigned char *str)
-{
- /* converts string to uppercase in place */
- unsigned char *tmp = str;;
-
- do *str = toupper(*str); while (*(++str));
- return tmp;
-}
-
-static int
-unicodize (char *dst, const char *src)
-{
- /* not really unicode... */
- int i = 0;
- do
- {
- dst[i++] = *src;
- dst[i++] = 0;
- }
- while (*src++);
-
- return i;
-}
-
-static void
-add_security_buffer(int sb_offset, void *data, int length, unsigned char *msg_buf, int *msg_bufpos)
-{
- /* Adds security buffer data to a message and sets security buffer's offset and length */
- msg_buf[sb_offset] = (unsigned char)length;
- msg_buf[sb_offset + 2] = msg_buf[sb_offset];
- msg_buf[sb_offset + 4] = (unsigned char)(*msg_bufpos & 0xff);
- msg_buf[sb_offset + 5] = (unsigned char)((*msg_bufpos >> 8) & 0xff);
- memcpy(&msg_buf[*msg_bufpos], data, msg_buf[sb_offset]);
- *msg_bufpos += length;
-}
-
-const char *
-ntlm_phase_1 (const struct http_proxy_info *p, struct gc_arena *gc)
-{
- struct buffer out = alloc_buf_gc (96, gc);
- /* try a minimal NTLM handshake
- *
- * http://davenport.sourceforge.net/ntlm.html
- *
- * This message contains only the NTLMSSP signature,
- * the NTLM message type,
- * and the minimal set of flags (Negotiate NTLM and Negotiate OEM).
- *
- */
- buf_printf (&out, "%s", "TlRMTVNTUAABAAAAAgIAAA==");
- return (BSTR (&out));
-}
-
-const char *
-ntlm_phase_3 (const struct http_proxy_info *p, const char *phase_2, struct gc_arena *gc)
-{
- /* NTLM handshake
- *
- * http://davenport.sourceforge.net/ntlm.html
- *
- */
-
- char pwbuf[sizeof (p->up.password) * 2]; /* for unicode password */
- char buf2[128]; /* decoded reply from proxy */
- unsigned char phase3[464];
-
- char md4_hash[21];
- char challenge[8], ntlm_response[24];
- int i, ret_val;
- des_cblock key1, key2, key3;
- des_key_schedule sched1, sched2, sched3;
-
- char ntlmv2_response[144];
- char userdomain_u[256]; /* for uppercase unicode username and domain */
- char userdomain[128]; /* the same as previous but ascii */
- char ntlmv2_hash[16];
- char ntlmv2_hmacmd5[16];
- char *ntlmv2_blob = ntlmv2_response + 16; /* inside ntlmv2_response, length: 128 */
- int ntlmv2_blob_size=0;
- int phase3_bufpos = 0x40; /* offset to next security buffer data to be added */
- size_t len;
-
- char domain[128];
- char username[128];
- char *separator;
-
- bool ntlmv2_enabled = (p->auth_method == HTTP_AUTH_NTLM2);
-
- CLEAR (buf2);
-
- ASSERT (strlen (p->up.username) > 0);
- ASSERT (strlen (p->up.password) > 0);
-
- /* username parsing */
- separator = strchr(p->up.username, '\\');
- if (separator == NULL) {
- strncpy(username, p->up.username, sizeof(username)-1);
- username[sizeof(username)-1]=0;
- domain[0]=0;
- } else {
- strncpy(username, separator+1, sizeof(username)-1);
- username[sizeof(username)-1]=0;
- len = separator - p->up.username;
- if (len > sizeof(domain) - 1) len = sizeof(domain) - 1;
- strncpy(domain, p->up.username, len);
- domain[len]=0;
- }
-
-
- /* fill 1st 16 bytes with md4 hash, disregard terminating null */
- gen_md4_hash (pwbuf, unicodize (pwbuf, p->up.password) - 2, md4_hash);
-
- /* pad to 21 bytes */
- memset (md4_hash + 16, 0, 5);
-
- ret_val = base64_decode( phase_2, (void *)buf2);
- if (ret_val < 0)
- return NULL;
-
- /* we can be sure that phase_2 is less than 128
- * therefore buf2 needs to be (3/4 * 128) */
-
- /* extract the challenge from bytes 24-31 */
- for (i=0; i<8; i++)
- {
- challenge[i] = buf2[i+24];
- }
-
- if (ntlmv2_enabled){ /* Generate NTLMv2 response */
- int tib_len;
-
- /* NTLMv2 hash */
- my_strupr((unsigned char *)strcpy(userdomain, username));
- if (strlen(username) + strlen(domain) < sizeof(userdomain))
- strcat(userdomain, domain);
- else
- msg (M_INFO, "Warning: Username or domain too long");
- unicodize (userdomain_u, userdomain);
- gen_hmac_md5(userdomain_u, 2 * strlen(userdomain), md4_hash, 16, ntlmv2_hash);
-
- /* NTLMv2 Blob */
- memset(ntlmv2_blob, 0, 128); /* Clear blob buffer */
- ntlmv2_blob[0x00]=1; /* Signature */
- ntlmv2_blob[0x01]=1; /* Signature */
- ntlmv2_blob[0x04]=0; /* Reserved */
- gen_timestamp((unsigned char *)&ntlmv2_blob[0x08]); /* 64-bit Timestamp */
- gen_nonce((unsigned char *)&ntlmv2_blob[0x10]); /* 64-bit Client Nonce */
- ntlmv2_blob[0x18]=0; /* Unknown, zero should work */
-
- /* Add target information block to the blob */
- if (( *((long *)&buf2[0x14]) & 0x00800000) == 0x00800000){ /* Check for Target Information block */
- tib_len = buf2[0x28];/* Get Target Information block size */
- if (tib_len > 96) tib_len = 96;
- {
- char *tib_ptr = buf2 + buf2[0x2c]; /* Get Target Information block pointer */
- memcpy(&ntlmv2_blob[0x1c], tib_ptr, tib_len); /* Copy Target Information block into the blob */
- }
- } else {
- tib_len = 0;
- }
-
- ntlmv2_blob[0x1c + tib_len] = 0; /* Unknown, zero works */
-
- /* Get blob length */
- ntlmv2_blob_size = 0x20 + tib_len;
-
- /* Add challenge from message 2 */
- memcpy(&ntlmv2_response[8], challenge, 8);
-
- /* hmac-md5 */
- gen_hmac_md5(&ntlmv2_response[8], ntlmv2_blob_size + 8, ntlmv2_hash, 16, ntlmv2_hmacmd5);
-
- /* Add hmac-md5 result to the blob */
- memcpy(ntlmv2_response, ntlmv2_hmacmd5, 16); /* Note: This overwrites challenge previously written at ntlmv2_response[8..15] */
-
- } else { /* Generate NTLM response */
-
- create_des_keys ((unsigned char *)md4_hash, key1);
- des_set_key_unchecked ((des_cblock *)key1, sched1);
- des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)ntlm_response, sched1, DES_ENCRYPT);
-
- create_des_keys ((unsigned char *)&(md4_hash[7]), key2);
- des_set_key_unchecked ((des_cblock *)key2, sched2);
- des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)&(ntlm_response[8]), sched2, DES_ENCRYPT);
-
- create_des_keys ((unsigned char *)&(md4_hash[14]), key3);
- des_set_key_unchecked ((des_cblock *)key3, sched3);
- des_ecb_encrypt ((des_cblock *)challenge, (des_cblock *)&(ntlm_response[16]), sched3, DES_ENCRYPT);
- }
-
-
- memset (phase3, 0, sizeof (phase3)); /* clear reply */
-
- strcpy ((char *)phase3, "NTLMSSP\0"); /* signature */
- phase3[8] = 3; /* type 3 */
-
- if (ntlmv2_enabled){ /* NTLMv2 response */
- add_security_buffer(0x14, ntlmv2_response, ntlmv2_blob_size + 16, phase3, &phase3_bufpos);
- }else{ /* NTLM response */
- add_security_buffer(0x14, ntlm_response, 24, phase3, &phase3_bufpos);
- }
-
- /* username in ascii */
- add_security_buffer(0x24, username, strlen (username), phase3, &phase3_bufpos);
-
- /* Set domain. If <domain> is empty, default domain will be used (i.e. proxy's domain) */
- add_security_buffer(0x1c, domain, strlen (domain), phase3, &phase3_bufpos);
-
-
- /* other security buffers will be empty */
- phase3[0x10] = phase3_bufpos; /* lm not used */
- phase3[0x30] = phase3_bufpos; /* no workstation name supplied */
- phase3[0x38] = phase3_bufpos; /* no session key */
-
- /* flags */
- phase3[0x3c] = 0x02; /* negotiate oem */
- phase3[0x3d] = 0x02; /* negotiate ntlm */
-
- return ((const char *)make_base64_string2 ((unsigned char *)phase3, phase3_bufpos, gc));
-}
-
-#else
-static void dummy(void) {}
-#endif