mirrors
/
FreeRDP
mirror of https://github.com/FreeRDP/FreeRDP
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
FreeRDP/libfreerdp-core/ntlmssp.c

1719 lines
49 KiB
C
Raw Blame History

/**
* FreeRDP: A Remote Desktop Protocol Client
* NT LAN Manager Security Support Provider (NTLMSSP)
*
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <time.h>
#include <openssl/des.h>
#include <openssl/md4.h>
#include <openssl/hmac.h>
#include <openssl/rand.h>
#include <openssl/engine.h>
#include <freerdp/utils/memory.h>
#include "ntlmssp.h"
#define NTLMSSP_INDEX_NEGOTIATE_56 0
#define NTLMSSP_INDEX_NEGOTIATE_KEY_EXCH 1
#define NTLMSSP_INDEX_NEGOTIATE_128 2
#define NTLMSSP_INDEX_NEGOTIATE_VERSION 6
#define NTLMSSP_INDEX_NEGOTIATE_TARGET_INFO 8
#define NTLMSSP_INDEX_REQUEST_NON_NT_SESSION_KEY 9
#define NTLMSSP_INDEX_NEGOTIATE_IDENTIFY 11
#define NTLMSSP_INDEX_NEGOTIATE_EXTENDED_SESSION_SECURITY 12
#define NTLMSSP_INDEX_TARGET_TYPE_SERVER 14
#define NTLMSSP_INDEX_TARGET_TYPE_DOMAIN 15
#define NTLMSSP_INDEX_NEGOTIATE_ALWAYS_SIGN 16
#define NTLMSSP_INDEX_NEGOTIATE_WORKSTATION_SUPPLIED 18
#define NTLMSSP_INDEX_NEGOTIATE_DOMAIN_SUPPLIED 19
#define NTLMSSP_INDEX_NEGOTIATE_NTLM 22
#define NTLMSSP_INDEX_NEGOTIATE_LM_KEY 24
#define NTLMSSP_INDEX_NEGOTIATE_DATAGRAM 25
#define NTLMSSP_INDEX_NEGOTIATE_SEAL 26
#define NTLMSSP_INDEX_NEGOTIATE_SIGN 27
#define NTLMSSP_INDEX_REQUEST_TARGET 29
#define NTLMSSP_INDEX_NEGOTIATE_OEM 30
#define NTLMSSP_INDEX_NEGOTIATE_UNICODE 31
#define NTLMSSP_NEGOTIATE_56 (1 << NTLMSSP_INDEX_NEGOTIATE_56)
#define NTLMSSP_NEGOTIATE_KEY_EXCH (1 << NTLMSSP_INDEX_NEGOTIATE_KEY_EXCH)
#define NTLMSSP_NEGOTIATE_128 (1 << NTLMSSP_INDEX_NEGOTIATE_128)
#define NTLMSSP_NEGOTIATE_VERSION (1 << NTLMSSP_INDEX_NEGOTIATE_VERSION)
#define NTLMSSP_NEGOTIATE_TARGET_INFO (1 << NTLMSSP_INDEX_NEGOTIATE_TARGET_INFO)
#define NTLMSSP_REQUEST_NON_NT_SESSION_KEY (1 << NTLMSSP_INDEX_REQUEST_NON_NT_SESSION_KEY)
#define NTLMSSP_NEGOTIATE_IDENTIFY (1 << NTLMSSP_INDEX_NEGOTIATE_IDENTIFY)
#define NTLMSSP_NEGOTIATE_EXTENDED_SESSION_SECURITY (1 << NTLMSSP_INDEX_NEGOTIATE_EXTENDED_SESSION_SECURITY)
#define NTLMSSP_TARGET_TYPE_SERVER (1 << NTLMSSP_INDEX_TARGET_TYPE_SERVER)
#define NTLMSSP_TARGET_TYPE_DOMAIN (1 << NTLMSSP_INDEX_TARGET_TYPE_DOMAIN)
#define NTLMSSP_NEGOTIATE_ALWAYS_SIGN (1 << NTLMSSP_INDEX_NEGOTIATE_ALWAYS_SIGN)
#define NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED (1 << NTLMSSP_INDEX_NEGOTIATE_WORKSTATION_SUPPLIED)
#define NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED (1 << NTLMSSP_INDEX_NEGOTIATE_DOMAIN_SUPPLIED)
#define NTLMSSP_NEGOTIATE_NTLM (1 << NTLMSSP_INDEX_NEGOTIATE_NTLM)
#define NTLMSSP_NEGOTIATE_LM_KEY (1 << NTLMSSP_INDEX_NEGOTIATE_LM_KEY)
#define NTLMSSP_NEGOTIATE_DATAGRAM (1 << NTLMSSP_INDEX_NEGOTIATE_DATAGRAM)
#define NTLMSSP_NEGOTIATE_SEAL (1 << NTLMSSP_INDEX_NEGOTIATE_SEAL)
#define NTLMSSP_NEGOTIATE_SIGN (1 << NTLMSSP_INDEX_NEGOTIATE_SIGN)
#define NTLMSSP_REQUEST_TARGET (1 << NTLMSSP_INDEX_REQUEST_TARGET)
#define NTLMSSP_NEGOTIATE_OEM (1 << NTLMSSP_INDEX_NEGOTIATE_OEM)
#define NTLMSSP_NEGOTIATE_UNICODE (1 << NTLMSSP_INDEX_NEGOTIATE_UNICODE)
#define WINDOWS_MAJOR_VERSION_5 0x05
#define WINDOWS_MAJOR_VERSION_6 0x06
#define WINDOWS_MINOR_VERSION_0 0x00
#define WINDOWS_MINOR_VERSION_1 0x01
#define WINDOWS_MINOR_VERSION_2 0x02
#define NTLMSSP_REVISION_W2K3 0x0F
const char ntlm_signature[] = "NTLMSSP";
const char lm_magic[] = "KGS!@#$%";
const char client_sign_magic[] = "session key to client-to-server signing key magic constant";
const char server_sign_magic[] = "session key to server-to-client signing key magic constant";
const char client_seal_magic[] = "session key to client-to-server sealing key magic constant";
const char server_seal_magic[] = "session key to server-to-client sealing key magic constant";
/**
* Set NTLMSSP username.
* @param ntlmssp
* @param username username
*/
void ntlmssp_set_username(NTLMSSP* ntlmssp, char* username)
{
freerdp_blob_free(&ntlmssp->username);
if (username != NULL)
{
ntlmssp->username.data = freerdp_uniconv_out(ntlmssp->uniconv, username, (size_t*) &(ntlmssp->username.length));
}
}
/**
* Set NTLMSSP domain name.
* @param ntlmssp
* @param domain domain name
*/
void ntlmssp_set_domain(NTLMSSP* ntlmssp, char* domain)
{
freerdp_blob_free(&ntlmssp->domain);
if (domain != NULL)
{
ntlmssp->domain.data = freerdp_uniconv_out(ntlmssp->uniconv, domain, (size_t*) &(ntlmssp->domain.length));
}
}
/**
* Set NTLMSSP password.
* @param ntlmssp
* @param password password
*/
void ntlmssp_set_password(NTLMSSP* ntlmssp, char* password)
{
freerdp_blob_free(&ntlmssp->password);
if (password != NULL)
{
ntlmssp->password.data = freerdp_uniconv_out(ntlmssp->uniconv, password, (size_t*) &(ntlmssp->password.length));
}
}
/**
* Generate client challenge (8-byte nonce).
* @param ntlmssp
*/
void ntlmssp_generate_client_challenge(NTLMSSP* ntlmssp)
{
/* ClientChallenge in computation of LMv2 and NTLMv2 responses */
crypto_nonce(ntlmssp->client_challenge, 8);
}
/**
* Generate KeyExchangeKey (the 128-bit SessionBaseKey).\n
* @msdn{cc236710}
* @param ntlmssp
*/
void ntlmssp_generate_key_exchange_key(NTLMSSP* ntlmssp)
{
/* In NTLMv2, KeyExchangeKey is the 128-bit SessionBaseKey */
memcpy(ntlmssp->key_exchange_key, ntlmssp->session_base_key, 16);
}
/**
* Generate RandomSessionKey (16-byte nonce).
* @param ntlmssp
*/
void ntlmssp_generate_random_session_key(NTLMSSP* ntlmssp)
{
crypto_nonce(ntlmssp->random_session_key, 16);
}
/**
* Generate ExportedSessionKey (the RandomSessionKey, exported)
* @param ntlmssp
*/
void ntlmssp_generate_exported_session_key(NTLMSSP* ntlmssp)
{
memcpy(ntlmssp->exported_session_key, ntlmssp->random_session_key, 16);
}
/**
* Encrypt RandomSessionKey (RC4-encrypted RandomSessionKey, using KeyExchangeKey as the key).
* @param ntlmssp
*/
void ntlmssp_encrypt_random_session_key(NTLMSSP* ntlmssp)
{
/* In NTLMv2, EncryptedRandomSessionKey is the ExportedSessionKey RC4-encrypted with the KeyExchangeKey */
credssp_rc4k(ntlmssp->key_exchange_key, 16, ntlmssp->random_session_key, ntlmssp->encrypted_random_session_key);
}
/**
* Generate timestamp for AUTHENTICATE_MESSAGE.
* @param ntlmssp
*/
void ntlmssp_generate_timestamp(NTLMSSP* ntlmssp)
{
credssp_current_time(ntlmssp->timestamp);
if (ntlmssp->ntlm_v2)
{
if (ntlmssp->av_pairs->Timestamp.length == 8)
{
memcpy(ntlmssp->av_pairs->Timestamp.value, ntlmssp->timestamp, 8);
return;
}
}
}
/**
* Generate signing key.\n
* @msdn{cc236711}
* @param exported_session_key ExportedSessionKey
* @param sign_magic Sign magic string
* @param signing_key Destination signing key
*/
void ntlmssp_generate_signing_key(uint8* exported_session_key, rdpBlob* sign_magic, uint8* signing_key)
{
int length;
uint8* value;
CryptoMd5 md5;
length = 16 + sign_magic->length;
value = (uint8*) xmalloc(length);
/* Concatenate ExportedSessionKey with sign magic */
memcpy(value, exported_session_key, 16);
memcpy(&value[16], sign_magic->data, sign_magic->length);
md5 = crypto_md5_init();
crypto_md5_update(md5, value, length);
crypto_md5_final(md5, signing_key);
xfree(value);
}
/**
* Generate client signing key (ClientSigningKey).\n
* @msdn{cc236711}
* @param ntlmssp
*/
void ntlmssp_generate_client_signing_key(NTLMSSP* ntlmssp)
{
rdpBlob sign_magic;
sign_magic.data = (void*) client_sign_magic;
sign_magic.length = sizeof(client_sign_magic);
ntlmssp_generate_signing_key(ntlmssp->exported_session_key, &sign_magic, ntlmssp->client_signing_key);
}
/**
* Generate server signing key (ServerSigningKey).\n
* @msdn{cc236711}
* @param ntlmssp
*/
void ntlmssp_generate_server_signing_key(NTLMSSP* ntlmssp)
{
rdpBlob sign_magic;
sign_magic.data = (void*) server_sign_magic;
sign_magic.length = sizeof(server_sign_magic);
ntlmssp_generate_signing_key(ntlmssp->exported_session_key, &sign_magic, ntlmssp->server_signing_key);
}
/**
* Generate sealing key.\n
* @msdn{cc236712}
* @param exported_session_key ExportedSessionKey
* @param seal_magic Seal magic string
* @param sealing_key Destination sealing key
*/
void ntlmssp_generate_sealing_key(uint8* exported_session_key, rdpBlob* seal_magic, uint8* sealing_key)
{
uint8* p;
CryptoMd5 md5;
rdpBlob blob;
freerdp_blob_alloc(&blob, 16 + seal_magic->length);
p = (uint8*) blob.data;
/* Concatenate ExportedSessionKey with seal magic */
memcpy(p, exported_session_key, 16);
memcpy(&p[16], seal_magic->data, seal_magic->length);
md5 = crypto_md5_init();
crypto_md5_update(md5, blob.data, blob.length);
crypto_md5_final(md5, sealing_key);
freerdp_blob_free(&blob);
}
/**
* Generate client sealing key (ClientSealingKey).\n
* @msdn{cc236712}
* @param ntlmssp
*/
void ntlmssp_generate_client_sealing_key(NTLMSSP* ntlmssp)
{
rdpBlob seal_magic;
seal_magic.data = (void*) client_seal_magic;
seal_magic.length = sizeof(client_seal_magic);
ntlmssp_generate_signing_key(ntlmssp->exported_session_key, &seal_magic, ntlmssp->client_sealing_key);
}
/**
* Generate server sealing key (ServerSealingKey).\n
* @msdn{cc236712}
* @param ntlmssp
*/
void ntlmssp_generate_server_sealing_key(NTLMSSP* ntlmssp)
{
rdpBlob seal_magic;
seal_magic.data = (void*) server_seal_magic;
seal_magic.length = sizeof(server_seal_magic);
ntlmssp_generate_signing_key(ntlmssp->exported_session_key, &seal_magic, ntlmssp->server_sealing_key);
}
/**
* Initialize RC4 stream cipher states for sealing.
* @param ntlmssp
*/
void ntlmssp_init_rc4_seal_states(NTLMSSP* ntlmssp)
{
ntlmssp->send_rc4_seal = crypto_rc4_init(ntlmssp->client_sealing_key, 16);
ntlmssp->recv_rc4_seal = crypto_rc4_init(ntlmssp->server_sealing_key, 16);
}
/**
* Get bit from a byte buffer using a bit offset.
* @param buffer byte buffer
* @param bit bit offset
* @return bit value
*/
static int get_bit(char* buffer, int bit)
{
return (buffer[(bit - (bit % 8)) / 8] >> (7 - bit % 8) & 1);
}
/**
* Set bit in a byte buffer using a bit offset.
* @param buffer byte buffer
* @param bit bit offset
* @param value bit value
*/
static void set_bit(char* buffer, int bit, int value)
{
buffer[(bit - (bit % 8)) / 8] |= value << (7 - bit % 8);
}
static void ntlmssp_compute_des_key(char* text, char* des_key)
{
int i, j;
int bit;
int nbits;
/* Convert the 7 bytes into a bit stream, and insert a parity-bit (odd parity) after every seven bits. */
memset(des_key, '\0', 8);
for (i = 0; i < 8; i++)
{
nbits = 0;
for (j = 0; j < 7; j++)
{
/* copy 7 bits, and count the number of bits that are set */
bit = get_bit(text, i*7 + j);
set_bit(des_key, i*7 + i + j, bit);
nbits += bit;
}
/* insert parity bit (odd parity) */
if (nbits % 2 == 0)
set_bit(des_key, i*7 + i + j, 1);
}
}
void ntlmssp_compute_lm_hash(char* password, char* hash)
{
int i;
int maxlen;
char text[14];
char des_key1[8];
char des_key2[8];
des_key_schedule ks;
/* LM("password") = E52CAC67419A9A224A3B108F3FA6CB6D */
maxlen = (strlen(password) < 14) ? strlen(password) : 14;
/* convert to uppercase */
for (i = 0; i < maxlen; i++)
{
if ((password[i] >= 'a') && (password[i] <= 'z'))
text[i] = password[i] - 32;
else
text[i] = password[i];
}
/* pad with nulls up to 14 bytes */
for (i = maxlen; i < 14; i++)
text[i] = '\0';
ntlmssp_compute_des_key(text, des_key1);
ntlmssp_compute_des_key(&text[7], des_key2);
DES_set_key((const_DES_cblock*)des_key1, &ks);
DES_ecb_encrypt((const_DES_cblock*) lm_magic, (DES_cblock*)hash, &ks, DES_ENCRYPT);
DES_set_key((const_DES_cblock*)des_key2, &ks);
DES_ecb_encrypt((const_DES_cblock*) lm_magic, (DES_cblock*)&hash[8], &ks, DES_ENCRYPT);
}
void ntlmssp_compute_ntlm_hash(rdpBlob* password, char* hash)
{
/* NTLMv1("password") = 8846F7EAEE8FB117AD06BDD830B7586C */
MD4_CTX md4_ctx;
/* Password needs to be in unicode */
/* Apply the MD4 digest algorithm on the password in unicode, the result is the NTLM hash */
MD4_Init(&md4_ctx);
MD4_Update(&md4_ctx, password->data, password->length);
MD4_Final((void*) hash, &md4_ctx);
}
void ntlmssp_compute_ntlm_v2_hash(NTLMSSP* ntlmssp, char* hash)
{
char* p;
rdpBlob blob;
char ntlm_hash[16];
freerdp_blob_alloc(&blob, ntlmssp->username.length + ntlmssp->domain.length);
p = (char*) blob.data;
/* First, compute the NTLMv1 hash of the password */
ntlmssp_compute_ntlm_hash(&ntlmssp->password, ntlm_hash);
/* Concatenate(Uppercase(username),domain)*/
memcpy(p, ntlmssp->username.data, ntlmssp->username.length);
freerdp_uniconv_uppercase(ntlmssp->uniconv, p, ntlmssp->username.length / 2);
memcpy(&p[ntlmssp->username.length], ntlmssp->domain.data, ntlmssp->domain.length);
/* Compute the HMAC-MD5 hash of the above value using the NTLMv1 hash as the key, the result is the NTLMv2 hash */
HMAC(EVP_md5(), (void*) ntlm_hash, 16, blob.data, blob.length, (void*) hash, NULL);
freerdp_blob_free(&blob);
}
void ntlmssp_compute_lm_response(char* password, char* challenge, char* response)
{
char hash[21];
char des_key1[8];
char des_key2[8];
char des_key3[8];
des_key_schedule ks;
/* A LM hash is 16-bytes long, but the LM response uses a LM hash null-padded to 21 bytes */
memset(hash, '\0', 21);
ntlmssp_compute_lm_hash(password, hash);
/* Each 7-byte third of the 21-byte null-padded LM hash is used to create a DES key */
ntlmssp_compute_des_key(hash, des_key1);
ntlmssp_compute_des_key(&hash[7], des_key2);
ntlmssp_compute_des_key(&hash[14], des_key3);
/* Encrypt the LM challenge with each key, and concatenate the result. This is the LM response (24 bytes) */
DES_set_key((const_DES_cblock*)des_key1, &ks);
DES_ecb_encrypt((const_DES_cblock*)challenge, (DES_cblock*)response, &ks, DES_ENCRYPT);
DES_set_key((const_DES_cblock*)des_key2, &ks);
DES_ecb_encrypt((const_DES_cblock*)challenge, (DES_cblock*)&response[8], &ks, DES_ENCRYPT);
DES_set_key((const_DES_cblock*)des_key3, &ks);
DES_ecb_encrypt((const_DES_cblock*)challenge, (DES_cblock*)&response[16], &ks, DES_ENCRYPT);
}
void ntlmssp_compute_lm_v2_response(NTLMSSP* ntlmssp)
{
char *response;
char value[16];
char ntlm_v2_hash[16];
/* Compute the NTLMv2 hash */
ntlmssp_compute_ntlm_v2_hash(ntlmssp, ntlm_v2_hash);
/* Concatenate the server and client challenges */
memcpy(value, ntlmssp->server_challenge, 8);
memcpy(&value[8], ntlmssp->client_challenge, 8);
freerdp_blob_alloc(&ntlmssp->lm_challenge_response, 24);
response = (char*) ntlmssp->lm_challenge_response.data;
/* Compute the HMAC-MD5 hash of the resulting value using the NTLMv2 hash as the key */
HMAC(EVP_md5(), (void*) ntlm_v2_hash, 16, (void*) value, 16, (void*) response, NULL);
/* Concatenate the resulting HMAC-MD5 hash and the client challenge, giving us the LMv2 response (24 bytes) */
memcpy(&response[16], ntlmssp->client_challenge, 8);
}
/**
* Compute NTLMv2 Response.\n
* NTLMv2_RESPONSE @msdn{cc236653}\n
* NTLMv2 Authentication @msdn{cc236700}
* @param ntlmssp
*/
void ntlmssp_compute_ntlm_v2_response(NTLMSSP* ntlmssp)
{
uint8* blob;
uint8 ntlm_v2_hash[16];
uint8 nt_proof_str[16];
rdpBlob ntlm_v2_temp;
rdpBlob ntlm_v2_temp_chal;
freerdp_blob_alloc(&ntlm_v2_temp, ntlmssp->target_info.length + 28);
memset(ntlm_v2_temp.data, '\0', ntlm_v2_temp.length);
blob = (uint8*) ntlm_v2_temp.data;
/* Compute the NTLMv2 hash */
ntlmssp_compute_ntlm_v2_hash(ntlmssp, (char*) ntlm_v2_hash);
#ifdef WITH_DEBUG_NLA
printf("Password (length = %d)\n", ntlmssp->password.length);
freerdp_hexdump(ntlmssp->password.data, ntlmssp->password.length);
printf("\n");
printf("Username (length = %d)\n", ntlmssp->username.length);
freerdp_hexdump(ntlmssp->username.data, ntlmssp->username.length);
printf("\n");
printf("Domain (length = %d)\n", ntlmssp->domain.length);
freerdp_hexdump(ntlmssp->domain.data, ntlmssp->domain.length);
printf("\n");
printf("NTOWFv2, NTLMv2 Hash\n");
freerdp_hexdump(ntlm_v2_hash, 16);
printf("\n");
#endif
/* Construct temp */
blob[0] = 1; /* RespType (1 byte) */
blob[1] = 1; /* HighRespType (1 byte) */
/* Reserved1 (2 bytes) */
/* Reserved2 (4 bytes) */
memcpy(&blob[8], ntlmssp->timestamp, 8); /* Timestamp (8 bytes) */
memcpy(&blob[16], ntlmssp->client_challenge, 8); /* ClientChallenge (8 bytes) */
/* Reserved3 (4 bytes) */
memcpy(&blob[28], ntlmssp->target_info.data, ntlmssp->target_info.length);
#ifdef WITH_DEBUG_NLA
printf("NTLMv2 Response Temp Blob\n");
freerdp_hexdump(ntlm_v2_temp.data, ntlm_v2_temp.length);
printf("\n");
#endif
/* Concatenate server challenge with temp */
freerdp_blob_alloc(&ntlm_v2_temp_chal, ntlm_v2_temp.length + 8);
blob = (uint8*) ntlm_v2_temp_chal.data;
memcpy(blob, ntlmssp->server_challenge, 8);
memcpy(&blob[8], ntlm_v2_temp.data, ntlm_v2_temp.length);
HMAC(EVP_md5(), (void*) ntlm_v2_hash, 16, (void*) ntlm_v2_temp_chal.data,
ntlm_v2_temp_chal.length, (void*) nt_proof_str, NULL);
/* NtChallengeResponse, Concatenate NTProofStr with temp */
freerdp_blob_alloc(&ntlmssp->nt_challenge_response, ntlm_v2_temp.length + 16);
blob = (uint8*) ntlmssp->nt_challenge_response.data;
memcpy(blob, nt_proof_str, 16);
memcpy(&blob[16], ntlm_v2_temp.data, ntlm_v2_temp.length);
/* Compute SessionBaseKey, the HMAC-MD5 hash of NTProofStr using the NTLMv2 hash as the key */
HMAC(EVP_md5(), (void*) ntlm_v2_hash, 16,
(void*) nt_proof_str, 16, (void*) ntlmssp->session_base_key, NULL);
freerdp_blob_free(&ntlm_v2_temp);
freerdp_blob_free(&ntlm_v2_temp_chal);
}
/**
* Input NegotiateFlags, a 4-byte bit map.
* @param s
* @param flags
*/
void ntlmssp_input_negotiate_flags(STREAM* s, uint32 *flags)
{
uint8* p;
uint8 tmp;
uint32 negotiateFlags;
/*
* NegotiateFlags is a 4-byte bit map
* Reverse order and then input in Big Endian
*/
stream_read_uint32_be(s, negotiateFlags);
p = (uint8*) &negotiateFlags;
tmp = p[0];
p[0] = p[3];
p[3] = tmp;
tmp = p[1];
p[1] = p[2];
p[2] = tmp;
*flags = negotiateFlags;
}
/**
* Output NegotiateFlags, a 4-byte bit map.
* @param s
* @param flags
*/
void ntlmssp_output_negotiate_flags(STREAM* s, uint32 flags)
{
uint8* p;
uint8 tmp;
/*
* NegotiateFlags is a 4-byte bit map
* Output in Big Endian and then reverse order
*/
p = s->p;
stream_write_uint32_be(s, flags);
tmp = p[0];
p[0] = p[3];
p[3] = tmp;
tmp = p[1];
p[1] = p[2];
p[2] = tmp;
}
#ifdef WITH_DEBUG_NLA
static void ntlmssp_print_negotiate_flags(uint32 flags)
{
printf("negotiateFlags \"0x%08X\"{\n", flags);
if (flags & NTLMSSP_NEGOTIATE_56)
printf("\tNTLMSSP_NEGOTIATE_56\n");
if (flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
printf("\tNTLMSSP_NEGOTIATE_KEY_EXCH\n");
if (flags & NTLMSSP_NEGOTIATE_128)
printf("\tNTLMSSP_NEGOTIATE_128\n");
if (flags & NTLMSSP_NEGOTIATE_VERSION)
printf("\tNTLMSSP_NEGOTIATE_VERSION\n");
if (flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
printf("\tNTLMSSP_NEGOTIATE_TARGET_INFO\n");
if (flags & NTLMSSP_REQUEST_NON_NT_SESSION_KEY)
printf("\tNTLMSSP_REQUEST_NON_NT_SESSION_KEY\n");
if (flags & NTLMSSP_NEGOTIATE_IDENTIFY)
printf("\tNTLMSSP_NEGOTIATE_IDENTIFY\n");
if (flags & NTLMSSP_NEGOTIATE_EXTENDED_SESSION_SECURITY)
printf("\tNTLMSSP_NEGOTIATE_EXTENDED_SESSION_SECURITY\n");
if (flags & NTLMSSP_TARGET_TYPE_SERVER)
printf("\tNTLMSSP_TARGET_TYPE_SERVER\n");
if (flags & NTLMSSP_TARGET_TYPE_DOMAIN)
printf("\tNTLMSSP_TARGET_TYPE_DOMAIN\n");
if (flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
printf("\tNTLMSSP_NEGOTIATE_ALWAYS_SIGN\n");
if (flags & NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED)
printf("\tNTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED\n");
if (flags & NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED)
printf("\tNTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED\n");
if (flags & NTLMSSP_NEGOTIATE_NTLM)
printf("\tNTLMSSP_NEGOTIATE_NTLM\n");
if (flags & NTLMSSP_NEGOTIATE_LM_KEY)
printf("\tNTLMSSP_NEGOTIATE_LM_KEY\n");
if (flags & NTLMSSP_NEGOTIATE_DATAGRAM)
printf("\tNTLMSSP_NEGOTIATE_DATAGRAM\n");
if (flags & NTLMSSP_NEGOTIATE_SEAL)
printf("\tNTLMSSP_NEGOTIATE_SEAL\n");
if (flags & NTLMSSP_NEGOTIATE_SIGN)
printf("\tNTLMSSP_NEGOTIATE_SIGN\n");
if (flags & NTLMSSP_REQUEST_TARGET)
printf("\tNTLMSSP_REQUEST_TARGET\n");
if (flags & NTLMSSP_NEGOTIATE_OEM)
printf("\tNTLMSSP_NEGOTIATE_OEM\n");
if (flags & NTLMSSP_NEGOTIATE_UNICODE)
printf("\tNTLMSSP_NEGOTIATE_UNICODE\n");
printf("}\n");
}
#endif
/**
* Output Restriction_Encoding.\n
* Restriction_Encoding @msdn{cc236647}
* @param ntlmssp
*/
static void ntlmssp_output_restriction_encoding(NTLMSSP* ntlmssp)
{
AV_PAIR *restrictions = &ntlmssp->av_pairs->Restrictions;
STREAM* s = stream_new(0);
uint8 machineID[32] =
"\x3A\x15\x8E\xA6\x75\x82\xD8\xF7\x3E\x06\xFA\x7A\xB4\xDF\xFD\x43"
"\x84\x6C\x02\x3A\xFD\x5A\x94\xFE\xCF\x97\x0F\x3D\x19\x2C\x38\x20";
restrictions->value = xmalloc(48);
restrictions->length = 48;
s->data = restrictions->value;
s->size = restrictions->length;
s->p = s->data;
stream_write_uint32(s, 48); /* Size */
stream_write_zero(s, 4); /* Z4 (set to zero) */
/* IntegrityLevel (bit 31 set to 1) */
stream_write_uint8(s, 1);
stream_write_zero(s, 3);
stream_write_uint32(s, 0x20000000); /* SubjectIntegrityLevel */
stream_write(s, machineID, 32); /* MachineID */
xfree(s);
}
/**
* Populate array of AV_PAIRs.\n
* AV_PAIR @msdn{cc236646}
* @param ntlmssp
*/
void ntlmssp_populate_av_pairs(NTLMSSP* ntlmssp)
{
STREAM* s;
rdpBlob target_info;
AV_PAIRS *av_pairs = ntlmssp->av_pairs;
/* MsvAvFlags */
av_pairs->Flags = 0x00000002; /* Indicates the present of a Message Integrity Check (MIC) */
/* Restriction_Encoding */
ntlmssp_output_restriction_encoding(ntlmssp);
s = stream_new(0);
s->data = xmalloc(ntlmssp->target_info.length + 512);
s->p = s->data;
ntlmssp_output_av_pairs(ntlmssp, s);
freerdp_blob_alloc(&target_info, s->p - s->data);
memcpy(target_info.data, s->data, target_info.length);
ntlmssp->target_info.data = target_info.data;
ntlmssp->target_info.length = target_info.length;
}
/**
* Input array of AV_PAIRs.\n
* AV_PAIR @msdn{cc236646}
* @param ntlmssp
* @param s
*/
void ntlmssp_input_av_pairs(NTLMSSP* ntlmssp, STREAM* s)
{
AV_ID AvId;
uint16 AvLen;
uint8* value;
AV_PAIRS* av_pairs = ntlmssp->av_pairs;
do
{
value = NULL;
stream_read_uint16(s, AvId);
stream_read_uint16(s, AvLen);
if (AvLen > 0)
{
if (AvId != MsvAvFlags)
{
value = xmalloc(AvLen);
stream_read(s, value, AvLen);
}
else
{
stream_read_uint32(s, av_pairs->Flags);
}
}
switch (AvId)
{
case MsvAvNbComputerName:
//printf("AvId: MsvAvNbComputerName, AvLen: %d\n", AvLen);
av_pairs->NbComputerName.length = AvLen;
av_pairs->NbComputerName.value = value;
break;
case MsvAvNbDomainName:
//printf("AvId: MsvAvNbDomainName, AvLen: %d\n", AvLen);
av_pairs->NbDomainName.length = AvLen;
av_pairs->NbDomainName.value = value;
break;
case MsvAvDnsComputerName:
//printf("AvId: MsvAvDnsComputerName, AvLen: %d\n", AvLen);
av_pairs->DnsComputerName.length = AvLen;
av_pairs->DnsComputerName.value = value;
break;
case MsvAvDnsDomainName:
//printf("AvId: MsvAvDnsDomainName, AvLen: %d\n", AvLen);
av_pairs->DnsDomainName.length = AvLen;
av_pairs->DnsDomainName.value = value;
break;
case MsvAvDnsTreeName:
//printf("AvId: MsvAvDnsTreeName, AvLen: %d\n", AvLen);
av_pairs->DnsTreeName.length = AvLen;
av_pairs->DnsTreeName.value = value;
break;
case MsvAvTimestamp:
//printf("AvId: MsvAvTimestamp, AvLen: %d\n", AvLen);
av_pairs->Timestamp.length = AvLen;
av_pairs->Timestamp.value = value;
break;
case MsvAvRestrictions:
//printf("AvId: MsvAvRestrictions, AvLen: %d\n", AvLen);
av_pairs->Restrictions.length = AvLen;
av_pairs->Restrictions.value = value;
break;
case MsvAvTargetName:
//printf("AvId: MsvAvTargetName, AvLen: %d\n", AvLen);
av_pairs->TargetName.length = AvLen;
av_pairs->TargetName.value = value;
break;
case MsvChannelBindings:
//printf("AvId: MsvAvChannelBindings, AvLen: %d\n", AvLen);
av_pairs->ChannelBindings.length = AvLen;
av_pairs->ChannelBindings.value = value;
break;
default:
if (value != NULL)
xfree(value);
break;
}
}
while(AvId != MsvAvEOL);
}
/**
* Output array of AV_PAIRs.\n
* AV_PAIR @msdn{cc236646}
* @param ntlmssp
* @param s
*/
void ntlmssp_output_av_pairs(NTLMSSP* ntlmssp, STREAM* s)
{
AV_PAIRS *av_pairs = ntlmssp->av_pairs;
if (av_pairs->NbDomainName.length > 0)
{
stream_write_uint16(s, MsvAvNbDomainName); /* AvId */
stream_write_uint16(s, av_pairs->NbDomainName.length); /* AvLen */
stream_write(s, av_pairs->NbDomainName.value, av_pairs->NbDomainName.length); /* Value */
}
if (av_pairs->NbComputerName.length > 0)
{
stream_write_uint16(s, MsvAvNbComputerName); /* AvId */
stream_write_uint16(s, av_pairs->NbComputerName.length); /* AvLen */
stream_write(s, av_pairs->NbComputerName.value, av_pairs->NbComputerName.length); /* Value */
}
if (av_pairs->DnsDomainName.length > 0)
{
stream_write_uint16(s, MsvAvDnsDomainName); /* AvId */
stream_write_uint16(s, av_pairs->DnsDomainName.length); /* AvLen */
stream_write(s, av_pairs->DnsDomainName.value, av_pairs->DnsDomainName.length); /* Value */
}
if (av_pairs->DnsComputerName.length > 0)
{
stream_write_uint16(s, MsvAvDnsComputerName); /* AvId */
stream_write_uint16(s, av_pairs->DnsComputerName.length); /* AvLen */
stream_write(s, av_pairs->DnsComputerName.value, av_pairs->DnsComputerName.length); /* Value */
}
if (av_pairs->DnsTreeName.length > 0)
{
stream_write_uint16(s, MsvAvDnsTreeName); /* AvId */
stream_write_uint16(s, av_pairs->DnsTreeName.length); /* AvLen */
stream_write(s, av_pairs->DnsTreeName.value, av_pairs->DnsTreeName.length); /* Value */
}
if (av_pairs->Timestamp.length > 0)
{
stream_write_uint16(s, MsvAvTimestamp); /* AvId */
stream_write_uint16(s, av_pairs->Timestamp.length); /* AvLen */
stream_write(s, av_pairs->Timestamp.value, av_pairs->Timestamp.length); /* Value */
}
if (av_pairs->Flags > 0)
{
stream_write_uint16(s, MsvAvFlags); /* AvId */
stream_write_uint16(s, 4); /* AvLen */
stream_write_uint32(s, av_pairs->Flags); /* Value */
}
if (av_pairs->Restrictions.length > 0)
{
stream_write_uint16(s, MsvAvRestrictions); /* AvId */
stream_write_uint16(s, av_pairs->Restrictions.length); /* AvLen */
stream_write(s, av_pairs->Restrictions.value, av_pairs->Restrictions.length); /* Value */
}
if (av_pairs->ChannelBindings.length > 0)
{
stream_write_uint16(s, MsvChannelBindings); /* AvId */
stream_write_uint16(s, av_pairs->ChannelBindings.length); /* AvLen */
stream_write(s, av_pairs->ChannelBindings.value, av_pairs->ChannelBindings.length); /* Value */
}
if (av_pairs->TargetName.length > 0)
{
stream_write_uint16(s, MsvAvTargetName); /* AvId */
stream_write_uint16(s, av_pairs->TargetName.length); /* AvLen */
stream_write(s, av_pairs->TargetName.value, av_pairs->TargetName.length); /* Value */
}
/* This endicates the end of the AV_PAIR array */
stream_write_uint16(s, MsvAvEOL); /* AvId */
stream_write_uint16(s, 0); /* AvLen */
if (ntlmssp->ntlm_v2)
{
stream_write_zero(s, 8);
}
}
/**
* Free array of AV_PAIRs.\n
* AV_PAIR @msdn{cc236646}
* @param ntlmssp
*/
void ntlmssp_free_av_pairs(NTLMSSP* ntlmssp)
{
AV_PAIRS *av_pairs = ntlmssp->av_pairs;
if (av_pairs != NULL)
{
if (av_pairs->NbComputerName.value != NULL)
xfree(av_pairs->NbComputerName.value);
if (av_pairs->NbDomainName.value != NULL)
xfree(av_pairs->NbDomainName.value);
if (av_pairs->DnsComputerName.value != NULL)
xfree(av_pairs->DnsComputerName.value);
if (av_pairs->DnsDomainName.value != NULL)
xfree(av_pairs->DnsDomainName.value);
if (av_pairs->DnsTreeName.value != NULL)
xfree(av_pairs->DnsTreeName.value);
if (av_pairs->Timestamp.value != NULL)
xfree(av_pairs->Timestamp.value);
if (av_pairs->Restrictions.value != NULL)
xfree(av_pairs->Restrictions.value);
if (av_pairs->TargetName.value != NULL)
xfree(av_pairs->TargetName.value);
if (av_pairs->ChannelBindings.value != NULL)
xfree(av_pairs->ChannelBindings.value);
xfree(av_pairs);
}
ntlmssp->av_pairs = NULL;
}
/**
* Output VERSION structure.\n
* VERSION @msdn{cc236654}
* @param s
*/
static void ntlmssp_output_version(STREAM* s)
{
/* The following version information was observed with Windows 7 */
stream_write_uint8(s, WINDOWS_MAJOR_VERSION_6); /* ProductMajorVersion (1 byte) */
stream_write_uint8(s, WINDOWS_MINOR_VERSION_1); /* ProductMinorVersion (1 byte) */
stream_write_uint16(s, 7600); /* ProductBuild (2 bytes) */
stream_write_zero(s, 3); /* Reserved (3 bytes) */
stream_write_uint8(s, NTLMSSP_REVISION_W2K3); /* NTLMRevisionCurrent (1 byte) */
}
void ntlmssp_compute_message_integrity_check(NTLMSSP* ntlmssp)
{
HMAC_CTX hmac_ctx;
/*
* Compute the HMAC-MD5 hash of ConcatenationOf(NEGOTIATE_MESSAGE,
* CHALLENGE_MESSAGE, AUTHENTICATE_MESSAGE) using the ExportedSessionKey
*/
HMAC_CTX_init(&hmac_ctx);
HMAC_Init_ex(&hmac_ctx, ntlmssp->exported_session_key, 16, EVP_md5(), NULL);
HMAC_Update(&hmac_ctx, ntlmssp->negotiate_message.data, ntlmssp->negotiate_message.length);
HMAC_Update(&hmac_ctx, ntlmssp->challenge_message.data, ntlmssp->challenge_message.length);
HMAC_Update(&hmac_ctx, ntlmssp->authenticate_message.data, ntlmssp->authenticate_message.length);
HMAC_Final(&hmac_ctx, ntlmssp->message_integrity_check, NULL);
}
/**
* Encrypt and sign message using NTLMSSP.\n
* GSS_WrapEx() @msdn{cc236718}\n
* EncryptMessage() @msdn{aa375378}
* @param ntlmssp
* @param[in] msg message to encrypt
* @param[out] encrypted_msg encrypted message
* @param[out] signature destination signature
*/
void ntlmssp_encrypt_message(NTLMSSP* ntlmssp, rdpBlob* msg, rdpBlob* encrypted_msg, uint8* signature)
{
HMAC_CTX hmac_ctx;
uint8 digest[16];
uint8 checksum[8];
uint32 version = 1;
/* Compute the HMAC-MD5 hash of ConcatenationOf(seq_num,msg) using the client signing key */
HMAC_CTX_init(&hmac_ctx);
HMAC_Init_ex(&hmac_ctx, ntlmssp->client_signing_key, 16, EVP_md5(), NULL);
HMAC_Update(&hmac_ctx, (void*) &ntlmssp->send_seq_num, 4);
HMAC_Update(&hmac_ctx, msg->data, msg->length);
HMAC_Final(&hmac_ctx, digest, NULL);
/* Allocate space for encrypted message */
freerdp_blob_alloc(encrypted_msg, msg->length);
/* Encrypt message using with RC4 */
crypto_rc4(ntlmssp->send_rc4_seal, msg->length, msg->data, encrypted_msg->data);
/* RC4-encrypt first 8 bytes of digest */
crypto_rc4(ntlmssp->send_rc4_seal, 8, digest, checksum);
/* Concatenate version, ciphertext and sequence number to build signature */
memcpy(signature, (void*) &version, 4);
memcpy(&signature[4], (void*) checksum, 8);
memcpy(&signature[12], (void*) &(ntlmssp->send_seq_num), 4);
HMAC_CTX_cleanup(&hmac_ctx);
ntlmssp->send_seq_num++;
}
/**
* Decrypt message and verify signature using NTLMSSP.\n
* GSS_UnwrapEx() @msdn{cc236703}\n
* DecryptMessage() @msdn{aa375211}
* @param ntlmssp
* @param[in] encrypted_msg encrypted message
* @param[out] msg decrypted message
* @param[in] signature signature
* @return
*/
int ntlmssp_decrypt_message(NTLMSSP* ntlmssp, rdpBlob* encrypted_msg, rdpBlob* msg, uint8* signature)
{
HMAC_CTX hmac_ctx;
uint8 digest[16];
uint8 checksum[8];
uint32 version = 1;
uint8 expected_signature[16];
/* Allocate space for encrypted message */
freerdp_blob_alloc(msg, encrypted_msg->length);
/* Encrypt message using with RC4 */
crypto_rc4(ntlmssp->recv_rc4_seal, encrypted_msg->length, encrypted_msg->data, msg->data);
/* Compute the HMAC-MD5 hash of ConcatenationOf(seq_num,msg) using the client signing key */
HMAC_CTX_init(&hmac_ctx);
HMAC_Init_ex(&hmac_ctx, ntlmssp->server_signing_key, 16, EVP_md5(), NULL);
HMAC_Update(&hmac_ctx, (void*) &ntlmssp->recv_seq_num, 4);
HMAC_Update(&hmac_ctx, msg->data, msg->length);
HMAC_Final(&hmac_ctx, digest, NULL);
/* RC4-encrypt first 8 bytes of digest */
crypto_rc4(ntlmssp->recv_rc4_seal, 8, digest, checksum);
/* Concatenate version, ciphertext and sequence number to build signature */
memcpy(expected_signature, (void*) &version, 4);
memcpy(&expected_signature[4], (void*) checksum, 8);
memcpy(&expected_signature[12], (void*) &(ntlmssp->recv_seq_num), 4);
if (memcmp(signature, expected_signature, 16) != 0)
{
/* signature verification failed! */
printf("signature verification failed, something nasty is going on!\n");
return 0;
}
HMAC_CTX_cleanup(&hmac_ctx);
ntlmssp->recv_seq_num++;
return 1;
}
/**
* Send NTLMSSP NEGOTIATE_MESSAGE.\n
* NEGOTIATE_MESSAGE @msdn{cc236641}
* @param ntlmssp
* @param s
*/
void ntlmssp_send_negotiate_message(NTLMSSP* ntlmssp, STREAM* s)
{
int length;
uint32 negotiateFlags = 0;
stream_write(s, ntlm_signature, 8); /* Signature (8 bytes) */
stream_write_uint32(s, 1); /* MessageType */
if (ntlmssp->ntlm_v2)
{
/* Observed: b7 82 08 e2, Using: 07 82 08 e2 */
negotiateFlags |= NTLMSSP_NEGOTIATE_56;
negotiateFlags |= NTLMSSP_NEGOTIATE_128;
negotiateFlags |= NTLMSSP_NEGOTIATE_OEM;
negotiateFlags |= NTLMSSP_REQUEST_TARGET;
negotiateFlags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
negotiateFlags |= NTLMSSP_NEGOTIATE_DATAGRAM;
negotiateFlags |= NTLMSSP_NEGOTIATE_UNICODE;
negotiateFlags |= NTLMSSP_NEGOTIATE_VERSION;
negotiateFlags |= NTLMSSP_TARGET_TYPE_DOMAIN;
negotiateFlags |= NTLMSSP_REQUEST_NON_NT_SESSION_KEY;
negotiateFlags |= NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED;
}
else
{
negotiateFlags |= NTLMSSP_NEGOTIATE_56;
negotiateFlags |= NTLMSSP_NEGOTIATE_128;
negotiateFlags |= NTLMSSP_NEGOTIATE_OEM;
negotiateFlags |= NTLMSSP_REQUEST_TARGET;
negotiateFlags |= NTLMSSP_TARGET_TYPE_DOMAIN;
negotiateFlags |= NTLMSSP_REQUEST_NON_NT_SESSION_KEY;
negotiateFlags |= NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED;
negotiateFlags |= 0x00000030;
}
ntlmssp_output_negotiate_flags(s, negotiateFlags); /* NegotiateFlags (4 bytes) */
#ifdef WITH_DEBUG_NLA
ntlmssp_print_negotiate_flags(negotiateFlags);
#endif
/* only set if NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED is set */
/* DomainNameFields (8 bytes) */
stream_write_uint16(s, 0); /* DomainNameLen */
stream_write_uint16(s, 0); /* DomainNameMaxLen */
stream_write_uint32(s, 0); /* DomainNameBufferOffset */
/* only set if NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED is set */
/* WorkstationFields (8 bytes) */
stream_write_uint16(s, 0); /* WorkstationLen */
stream_write_uint16(s, 0); /* WorkstationMaxLen */
stream_write_uint32(s, 0); /* WorkstationBufferOffset */
if (negotiateFlags & NTLMSSP_NEGOTIATE_VERSION)
{
/* Only present if NTLMSSP_NEGOTIATE_VERSION is set */
ntlmssp_output_version(s);
}
length = s->p - s->data;
freerdp_blob_alloc(&ntlmssp->negotiate_message, length);
memcpy(ntlmssp->negotiate_message.data, s->data, length);
#ifdef WITH_DEBUG_NLA
printf("NEGOTIATE_MESSAGE (length = %d)\n", length);
freerdp_hexdump(s->data, length);
printf("\n");
#endif
ntlmssp->state = NTLMSSP_STATE_CHALLENGE;
}
/**
* Receive NTLMSSP CHALLENGE_MESSAGE.\n
* CHALLENGE_MESSAGE @msdn{cc236642}
* @param ntlmssp
* @param s
*/
void ntlmssp_recv_challenge_message(NTLMSSP* ntlmssp, STREAM* s)
{
uint8* p;
int length;
uint8* start_offset;
uint8* payload_offset;
uint16 targetNameLen;
uint16 targetNameMaxLen;
uint32 targetNameBufferOffset;
uint16 targetInfoLen;
uint16 targetInfoMaxLen;
uint32 targetInfoBufferOffset;
start_offset = s->p - 12;
/* TargetNameFields (8 bytes) */
stream_read_uint16(s, targetNameLen); /* TargetNameLen (2 bytes) */
stream_read_uint16(s, targetNameMaxLen); /* TargetNameMaxLen (2 bytes) */
stream_read_uint32(s, targetNameBufferOffset); /* TargetNameBufferOffset (4 bytes) */
ntlmssp_input_negotiate_flags(s, &(ntlmssp->negotiate_flags)); /* NegotiateFlags (4 bytes) */
#ifdef WITH_DEBUG_NLA
ntlmssp_print_negotiate_flags(ntlmssp->negotiate_flags);
#endif
stream_read(s, ntlmssp->server_challenge, 8); /* ServerChallenge (8 bytes) */
stream_seek(s, 8); /* Reserved (8 bytes), should be ignored */
/* TargetInfoFields (8 bytes) */
stream_read_uint16(s, targetInfoLen); /* TargetInfoLen (2 bytes) */
stream_read_uint16(s, targetInfoMaxLen); /* TargetInfoMaxLen (2 bytes) */
stream_read_uint32(s, targetInfoBufferOffset); /* TargetInfoBufferOffset (4 bytes) */
/* only present if NTLMSSP_NEGOTIATE_VERSION is set */
if (ntlmssp->negotiate_flags & NTLMSSP_NEGOTIATE_VERSION)
{
stream_seek(s, 8); /* Version (8 bytes), can be ignored */
}
/* Payload (variable) */
payload_offset = s->p;
if (targetNameLen > 0)
{
p = start_offset + targetNameBufferOffset;
freerdp_blob_alloc(&ntlmssp->target_name, targetNameLen);
memcpy(ntlmssp->target_name.data, p, targetNameLen);
#ifdef WITH_DEBUG_NLA
printf("targetName (length = %d, offset = %d)\n", targetNameLen, targetNameBufferOffset);
freerdp_hexdump(ntlmssp->target_name.data, ntlmssp->target_name.length);
printf("\n");
#endif
}
if (targetInfoLen > 0)
{
p = start_offset + targetInfoBufferOffset;
freerdp_blob_alloc(&ntlmssp->target_info, targetInfoLen);
memcpy(ntlmssp->target_info.data, p, targetInfoLen);
#ifdef WITH_DEBUG_NLA
printf("targetInfo (length = %d, offset = %d)\n", targetInfoLen, targetInfoBufferOffset);
freerdp_hexdump(ntlmssp->target_info.data, ntlmssp->target_info.length);
printf("\n");
#endif
if (ntlmssp->ntlm_v2)
{
s->p = p;
ntlmssp_input_av_pairs(ntlmssp, s);
}
}
length = (payload_offset - start_offset) + targetNameLen + targetInfoLen;
freerdp_blob_alloc(&ntlmssp->challenge_message, length);
memcpy(ntlmssp->challenge_message.data, start_offset, length);
#ifdef WITH_DEBUG_NLA
printf("CHALLENGE_MESSAGE (length = %d)\n", length);
freerdp_hexdump(start_offset, length);
printf("\n");
#endif
/* AV_PAIRs */
if (ntlmssp->ntlm_v2)
ntlmssp_populate_av_pairs(ntlmssp);
#ifdef WITH_DEBUG_NLA
printf("targetInfo (populated) (length = %d)\n", ntlmssp->target_info.length);
freerdp_hexdump(ntlmssp->target_info.data, ntlmssp->target_info.length);
printf("\n");
#endif
/* Timestamp */
ntlmssp_generate_timestamp(ntlmssp);
/* LmChallengeResponse */
ntlmssp_compute_lm_v2_response(ntlmssp);
if (ntlmssp->ntlm_v2)
memset(ntlmssp->lm_challenge_response.data, '\0', 24);
/* NtChallengeResponse */
ntlmssp_compute_ntlm_v2_response(ntlmssp);
/* KeyExchangeKey */
ntlmssp_generate_key_exchange_key(ntlmssp);
/* EncryptedRandomSessionKey */
ntlmssp_encrypt_random_session_key(ntlmssp);
/* Generate signing keys */
ntlmssp_generate_client_signing_key(ntlmssp);
ntlmssp_generate_server_signing_key(ntlmssp);
/* Generate sealing keys */
ntlmssp_generate_client_sealing_key(ntlmssp);
ntlmssp_generate_server_sealing_key(ntlmssp);
/* Initialize RC4 seal state using client sealing key */
ntlmssp_init_rc4_seal_states(ntlmssp);
#ifdef WITH_DEBUG_NLA
printf("ClientChallenge\n");
freerdp_hexdump(ntlmssp->client_challenge, 8);
printf("\n");
printf("ServerChallenge\n");
freerdp_hexdump(ntlmssp->server_challenge, 8);
printf("\n");
printf("SessionBaseKey\n");
freerdp_hexdump(ntlmssp->session_base_key, 16);
printf("\n");
printf("KeyExchangeKey\n");
freerdp_hexdump(ntlmssp->key_exchange_key, 16);
printf("\n");
printf("ExportedSessionKey\n");
freerdp_hexdump(ntlmssp->exported_session_key, 16);
printf("\n");
printf("RandomSessionKey\n");
freerdp_hexdump(ntlmssp->random_session_key, 16);
printf("\n");
printf("ClientSignKey\n");
freerdp_hexdump(ntlmssp->client_signing_key, 16);
printf("\n");
printf("ClientSealingKey\n");
freerdp_hexdump(ntlmssp->client_sealing_key, 16);
printf("\n");
printf("Timestamp\n");
freerdp_hexdump(ntlmssp->timestamp, 8);
printf("\n");
#endif
ntlmssp->state = NTLMSSP_STATE_AUTHENTICATE;
}
/**
* Send NTLMSSP AUTHENTICATE_MESSAGE.\n
* AUTHENTICATE_MESSAGE @msdn{cc236643}
* @param ntlmssp
* @param s
*/
void ntlmssp_send_authenticate_message(NTLMSSP* ntlmssp, STREAM* s)
{
int length;
uint32 negotiateFlags = 0;
uint8* mic_offset = NULL;
uint16 DomainNameLen;
uint16 UserNameLen;
uint16 WorkstationLen;
uint16 LmChallengeResponseLen;
uint16 NtChallengeResponseLen;
uint16 EncryptedRandomSessionKeyLen;
uint32 PayloadBufferOffset;
uint32 DomainNameBufferOffset;
uint32 UserNameBufferOffset;
uint32 WorkstationBufferOffset;
uint32 LmChallengeResponseBufferOffset;
uint32 NtChallengeResponseBufferOffset;
uint32 EncryptedRandomSessionKeyBufferOffset;
uint8* UserNameBuffer;
uint8* DomainNameBuffer;
uint8* WorkstationBuffer;
uint8* EncryptedRandomSessionKeyBuffer;
WorkstationLen = ntlmssp->workstation.length;
WorkstationBuffer = ntlmssp->workstation.data;
if (ntlmssp->ntlm_v2 < 1)
WorkstationLen = 0;
DomainNameLen = ntlmssp->domain.length;
DomainNameBuffer = ntlmssp->domain.data;
UserNameLen = ntlmssp->username.length;
UserNameBuffer = ntlmssp->username.data;
LmChallengeResponseLen = ntlmssp->lm_challenge_response.length;
NtChallengeResponseLen = ntlmssp->nt_challenge_response.length;
EncryptedRandomSessionKeyLen = 16;
EncryptedRandomSessionKeyBuffer = ntlmssp->encrypted_random_session_key;
if (ntlmssp->ntlm_v2)
{
/* Observed: 35 82 88 e2, Using: 35 82 88 e2 */
negotiateFlags |= NTLMSSP_NEGOTIATE_56;
negotiateFlags |= NTLMSSP_NEGOTIATE_128;
negotiateFlags |= NTLMSSP_NEGOTIATE_OEM;
negotiateFlags |= NTLMSSP_REQUEST_TARGET;
negotiateFlags |= NTLMSSP_NEGOTIATE_VERSION;
negotiateFlags |= NTLMSSP_NEGOTIATE_DATAGRAM;
negotiateFlags |= NTLMSSP_NEGOTIATE_UNICODE;
negotiateFlags |= NTLMSSP_TARGET_TYPE_DOMAIN;
negotiateFlags |= NTLMSSP_REQUEST_NON_NT_SESSION_KEY;
negotiateFlags |= NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED;
negotiateFlags &= ~0x00000040;
negotiateFlags |= 0x00800030;
}
else
{
negotiateFlags |= NTLMSSP_NEGOTIATE_56;
negotiateFlags |= NTLMSSP_NEGOTIATE_128;
negotiateFlags |= NTLMSSP_NEGOTIATE_OEM;
negotiateFlags |= NTLMSSP_REQUEST_TARGET;
negotiateFlags |= NTLMSSP_TARGET_TYPE_DOMAIN;
negotiateFlags |= NTLMSSP_REQUEST_NON_NT_SESSION_KEY;
negotiateFlags |= NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED;
negotiateFlags |= 0x00000030;
}
if (ntlmssp->ntlm_v2)
PayloadBufferOffset = 88; /* starting buffer offset */
else
PayloadBufferOffset = 64; /* starting buffer offset */
DomainNameBufferOffset = PayloadBufferOffset;
UserNameBufferOffset = DomainNameBufferOffset + DomainNameLen;
WorkstationBufferOffset = UserNameBufferOffset + UserNameLen;
LmChallengeResponseBufferOffset = WorkstationBufferOffset + WorkstationLen;
NtChallengeResponseBufferOffset = LmChallengeResponseBufferOffset + LmChallengeResponseLen;
EncryptedRandomSessionKeyBufferOffset = NtChallengeResponseBufferOffset + NtChallengeResponseLen;
stream_write(s, ntlm_signature, 8); /* Signature (8 bytes) */
stream_write_uint32(s, 3); /* MessageType */
/* LmChallengeResponseFields (8 bytes) */
stream_write_uint16(s, LmChallengeResponseLen); /* LmChallengeResponseLen */
stream_write_uint16(s, LmChallengeResponseLen); /* LmChallengeResponseMaxLen */
stream_write_uint32(s, LmChallengeResponseBufferOffset); /* LmChallengeResponseBufferOffset */
/* NtChallengeResponseFields (8 bytes) */
stream_write_uint16(s, NtChallengeResponseLen); /* NtChallengeResponseLen */
stream_write_uint16(s, NtChallengeResponseLen); /* NtChallengeResponseMaxLen */
stream_write_uint32(s, NtChallengeResponseBufferOffset); /* NtChallengeResponseBufferOffset */
/* only set if NTLMSSP_NEGOTIATE_DOMAIN_SUPPLIED is set */
/* DomainNameFields (8 bytes) */
stream_write_uint16(s, DomainNameLen); /* DomainNameLen */
stream_write_uint16(s, DomainNameLen); /* DomainNameMaxLen */
stream_write_uint32(s, DomainNameBufferOffset); /* DomainNameBufferOffset */
/* UserNameFields (8 bytes) */
stream_write_uint16(s, UserNameLen); /* UserNameLen */
stream_write_uint16(s, UserNameLen); /* UserNameMaxLen */
stream_write_uint32(s, UserNameBufferOffset); /* UserNameBufferOffset */
/* only set if NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED is set */
/* WorkstationFields (8 bytes) */
stream_write_uint16(s, WorkstationLen); /* WorkstationLen */
stream_write_uint16(s, WorkstationLen); /* WorkstationMaxLen */
stream_write_uint32(s, WorkstationBufferOffset); /* WorkstationBufferOffset */
/* EncryptedRandomSessionKeyFields (8 bytes) */
stream_write_uint16(s, EncryptedRandomSessionKeyLen); /* EncryptedRandomSessionKeyLen */
stream_write_uint16(s, EncryptedRandomSessionKeyLen); /* EncryptedRandomSessionKeyMaxLen */
stream_write_uint32(s, EncryptedRandomSessionKeyBufferOffset); /* EncryptedRandomSessionKeyBufferOffset */
ntlmssp_output_negotiate_flags(s, negotiateFlags); /* NegotiateFlags (4 bytes) */
#ifdef WITH_DEBUG_NLA
ntlmssp_print_negotiate_flags(negotiateFlags);
#endif
if (ntlmssp->ntlm_v2)
{
/* Version */
ntlmssp_output_version(s);
/* Message Integrity Check */
mic_offset = s->p;
stream_write_zero(s, 16);
}
/* DomainName */
if (DomainNameLen > 0)
{
stream_write(s, DomainNameBuffer, DomainNameLen);
#ifdef WITH_DEBUG_NLA
printf("DomainName (length = %d, offset = %d)\n", DomainNameLen, DomainNameBufferOffset);
freerdp_hexdump(DomainNameBuffer, DomainNameLen);
printf("\n");
#endif
}
/* UserName */
stream_write(s, UserNameBuffer, UserNameLen);
#ifdef WITH_DEBUG_NLA
printf("UserName (length = %d, offset = %d)\n", UserNameLen, UserNameBufferOffset);
freerdp_hexdump(UserNameBuffer, UserNameLen);
printf("\n");
#endif
/* Workstation */
if (WorkstationLen > 0)
{
stream_write(s, WorkstationBuffer, WorkstationLen);
#ifdef WITH_DEBUG_NLA
printf("Workstation (length = %d, offset = %d)\n", WorkstationLen, WorkstationBufferOffset);
freerdp_hexdump(WorkstationBuffer, WorkstationLen);
printf("\n");
#endif
}
/* LmChallengeResponse */
stream_write(s, ntlmssp->lm_challenge_response.data, LmChallengeResponseLen);
#ifdef WITH_DEBUG_NLA
printf("LmChallengeResponse (length = %d, offset = %d)\n", LmChallengeResponseLen, LmChallengeResponseBufferOffset);
freerdp_hexdump(ntlmssp->lm_challenge_response.data, LmChallengeResponseLen);
printf("\n");
#endif
/* NtChallengeResponse */
stream_write(s, ntlmssp->nt_challenge_response.data, NtChallengeResponseLen);
#ifdef WITH_DEBUG_NLA
printf("NtChallengeResponse (length = %d, offset = %d)\n", NtChallengeResponseLen, NtChallengeResponseBufferOffset);
freerdp_hexdump(ntlmssp->nt_challenge_response.data, NtChallengeResponseLen);
printf("\n");
#endif
/* EncryptedRandomSessionKey */
stream_write(s, EncryptedRandomSessionKeyBuffer, EncryptedRandomSessionKeyLen);
#ifdef WITH_DEBUG_NLA
printf("EncryptedRandomSessionKey (length = %d, offset = %d)\n", EncryptedRandomSessionKeyLen, EncryptedRandomSessionKeyBufferOffset);
freerdp_hexdump(EncryptedRandomSessionKeyBuffer, EncryptedRandomSessionKeyLen);
printf("\n");
#endif
length = s->p - s->data;
freerdp_blob_alloc(&ntlmssp->authenticate_message, length);
memcpy(ntlmssp->authenticate_message.data, s->data, length);
if (ntlmssp->ntlm_v2)
{
/* Message Integrity Check */
ntlmssp_compute_message_integrity_check(ntlmssp);
s->p = mic_offset;
stream_write(s, ntlmssp->message_integrity_check, 16);
}
#ifdef WITH_DEBUG_NLA
printf("AUTHENTICATE_MESSAGE (length = %d)\n", length);
freerdp_hexdump(s->data, length);
printf("\n");
#endif
ntlmssp->state = NTLMSSP_STATE_FINAL;
}
/**
* Send NTLMSSP message.
* @param ntlmssp
* @param s
* @return
*/
int ntlmssp_send(NTLMSSP* ntlmssp, STREAM* s)
{
if (ntlmssp->state == NTLMSSP_STATE_INITIAL)
ntlmssp->state = NTLMSSP_STATE_NEGOTIATE;
if (ntlmssp->state == NTLMSSP_STATE_NEGOTIATE)
ntlmssp_send_negotiate_message(ntlmssp, s);
else if (ntlmssp->state == NTLMSSP_STATE_AUTHENTICATE)
ntlmssp_send_authenticate_message(ntlmssp, s);
return (ntlmssp->state == NTLMSSP_STATE_FINAL) ? 0 : 1;
}
/**
* Receive NTLMSSP message.
* @param ntlmssp
* @param s
* @return
*/
int ntlmssp_recv(NTLMSSP* ntlmssp, STREAM* s)
{
char signature[8]; /* Signature, "NTLMSSP" */
uint32 messageType; /* MessageType */
stream_read(s, signature, 8);
stream_read_uint32(s, messageType);
if (messageType == 2 && ntlmssp->state == NTLMSSP_STATE_CHALLENGE)
ntlmssp_recv_challenge_message(ntlmssp, s);
return 1;
}
/**
* Create new NTLMSSP state machine instance.
* @return
*/
NTLMSSP* ntlmssp_new()
{
NTLMSSP* ntlmssp = (NTLMSSP*) xmalloc(sizeof(NTLMSSP));
if (ntlmssp != NULL)
{
memset(ntlmssp, '\0', sizeof(NTLMSSP));
ntlmssp->av_pairs = (AV_PAIRS*)xmalloc(sizeof(AV_PAIRS));
memset(ntlmssp->av_pairs, 0, sizeof(AV_PAIRS));
ntlmssp_init(ntlmssp);
}
return ntlmssp;
}
/**
* Initialize NTLMSSP state machine.
* @param ntlmssp
*/
void ntlmssp_init(NTLMSSP* ntlmssp)
{
ntlmssp->state = NTLMSSP_STATE_INITIAL;
ntlmssp->uniconv = freerdp_uniconv_new();
}
/**
* Finalize NTLMSSP state machine.
* @param ntlmssp
*/
void ntlmssp_uninit(NTLMSSP* ntlmssp)
{
freerdp_blob_free(&ntlmssp->username);
freerdp_blob_free(&ntlmssp->password);
freerdp_blob_free(&ntlmssp->domain);
freerdp_blob_free(&ntlmssp->spn);
freerdp_blob_free(&ntlmssp->workstation);
freerdp_blob_free(&ntlmssp->target_info);
freerdp_blob_free(&ntlmssp->target_name);
freerdp_blob_free(&ntlmssp->negotiate_message);
freerdp_blob_free(&ntlmssp->challenge_message);
freerdp_blob_free(&ntlmssp->authenticate_message);
freerdp_blob_free(&ntlmssp->lm_challenge_response);
freerdp_blob_free(&ntlmssp->nt_challenge_response);
ntlmssp_free_av_pairs(ntlmssp);
freerdp_uniconv_free(ntlmssp->uniconv);
ntlmssp->state = NTLMSSP_STATE_FINAL;
}
/**
* Free NTLMSSP state machine.
* @param ntlmssp
*/
void ntlmssp_free(NTLMSSP* ntlmssp)
{
ntlmssp_uninit(ntlmssp);
if (ntlmssp->send_rc4_seal)
crypto_rc4_free(ntlmssp->send_rc4_seal);
if (ntlmssp->recv_rc4_seal)
crypto_rc4_free(ntlmssp->recv_rc4_seal);
xfree(ntlmssp);
}
Reference in New Issue View Git Blame Copy Permalink