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/*
* WPA Supplicant / shared MSCHAPV2 helper functions / RFC 2433 / RFC 2759
* Copyright (c) 2004-2005, Jouni Malinen <jkmaline@cc.hut.fi>
*
* 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.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "sha1.h"
#include "ms_funcs.h"
#include "crypto.h"
static void challenge_hash(u8 *peer_challenge, u8 *auth_challenge,
u8 *username, size_t username_len,
u8 *challenge)
{
u8 hash[SHA1_MAC_LEN];
const unsigned char *addr[3];
size_t len[3];
addr[0] = peer_challenge;
len[0] = 16;
addr[1] = auth_challenge;
len[1] = 16;
addr[2] = username;
len[2] = username_len;
sha1_vector(3, addr, len, hash);
memcpy(challenge, hash, 8);
}
void nt_password_hash(u8 *password, size_t password_len, u8 *password_hash)
{
u8 *buf;
int i;
/* Convert password into unicode */
buf = malloc(password_len * 2);
if (buf == NULL)
return;
memset(buf, 0, password_len * 2);
for (i = 0; i < password_len; i++)
buf[2 * i] = password[i];
md4(buf, password_len * 2, password_hash);
free(buf);
}
void hash_nt_password_hash(u8 *password_hash, u8 *password_hash_hash)
{
md4(password_hash, 16, password_hash_hash);
}
void challenge_response(u8 *challenge, u8 *password_hash, u8 *response)
{
u8 zpwd[7];
des_encrypt(challenge, password_hash, response);
des_encrypt(challenge, password_hash + 7, response + 8);
zpwd[0] = password_hash[14];
zpwd[1] = password_hash[15];
memset(zpwd + 2, 0, 5);
des_encrypt(challenge, zpwd, response + 16);
}
void generate_nt_response(u8 *auth_challenge, u8 *peer_challenge,
u8 *username, size_t username_len,
u8 *password, size_t password_len,
u8 *response)
{
u8 challenge[8];
u8 password_hash[16];
challenge_hash(peer_challenge, auth_challenge, username, username_len,
challenge);
nt_password_hash(password, password_len, password_hash);
challenge_response(challenge, password_hash, response);
}
void generate_authenticator_response(u8 *password, size_t password_len,
u8 *peer_challenge,
u8 *auth_challenge,
u8 *username, size_t username_len,
u8 *nt_response, u8 *response)
{
static const u8 magic1[39] = {
0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74
};
static const u8 magic2[41] = {
0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
0x6E
};
u8 password_hash[16], password_hash_hash[16], challenge[8];
const unsigned char *addr1[3];
const size_t len1[3] = { 16, 24, sizeof(magic1) };
const unsigned char *addr2[3];
const size_t len2[3] = { SHA1_MAC_LEN, 8, sizeof(magic2) };
addr1[0] = password_hash_hash;
addr1[1] = nt_response;
addr1[2] = magic1;
addr2[0] = response;
addr2[1] = challenge;
addr2[2] = magic2;
nt_password_hash(password, password_len, password_hash);
hash_nt_password_hash(password_hash, password_hash_hash);
sha1_vector(3, addr1, len1, response);
challenge_hash(peer_challenge, auth_challenge, username, username_len,
challenge);
sha1_vector(3, addr2, len2, response);
}
void nt_challenge_response(u8 *challenge, u8 *password, size_t password_len,
u8 *response)
{
u8 password_hash[16];
nt_password_hash(password, password_len, password_hash);
challenge_response(challenge, password_hash, response);
}
/* IN: 16-octet password_hash_hash and 24-octet nt_response
* OUT: 16-octet master_key */
void get_master_key(const u8 *password_hash_hash, const u8 *nt_response,
u8 *master_key)
{
static const u8 magic1[27] = {
0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74,
0x68, 0x65, 0x20, 0x4d, 0x50, 0x50, 0x45, 0x20, 0x4d,
0x61, 0x73, 0x74, 0x65, 0x72, 0x20, 0x4b, 0x65, 0x79
};
const unsigned char *addr[3];
const size_t len[3] = { 16, 24, sizeof(magic1) };
addr[0] = password_hash_hash;
addr[1] = nt_response;
addr[2] = magic1;
sha1_vector(3, addr, len, master_key);
}
void get_asymetric_start_key(const u8 *master_key, u8 *session_key,
size_t session_key_len, int is_send,
int is_server)
{
static const u8 magic2[84] = {
0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20, 0x6b, 0x65, 0x79,
0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73,
0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73, 0x69, 0x64, 0x65,
0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
0x6b, 0x65, 0x79, 0x2e
};
static const u8 magic3[84] = {
0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
0x6b, 0x65, 0x79, 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68,
0x65, 0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73,
0x69, 0x64, 0x65, 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73,
0x20, 0x74, 0x68, 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20,
0x6b, 0x65, 0x79, 0x2e
};
static const u8 shs_pad1[40] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const u8 shs_pad2[40] = {
0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2
};
u8 digest[SHA1_MAC_LEN];
const unsigned char *addr[4];
const size_t len[4] = { 16, 40, 84, 40 };
addr[0] = master_key;
addr[1] = shs_pad1;
if (is_send) {
addr[2] = is_server ? magic3 : magic2;
} else {
addr[2] = is_server ? magic2 : magic3;
}
addr[3] = shs_pad2;
sha1_vector(4, addr, len, digest);
if (session_key_len > SHA1_MAC_LEN)
session_key_len = SHA1_MAC_LEN;
memcpy(session_key, digest, session_key_len);
}
#ifdef TEST_MAIN_MS_FUNCS
int main(int argc, char *argv[])
{
/* Test vector from RFC2759 example */
u8 *username = "User";
u8 *password = "clientPass";
u8 auth_challenge[] = {
0x5B, 0x5D, 0x7C, 0x7D, 0x7B, 0x3F, 0x2F, 0x3E,
0x3C, 0x2C, 0x60, 0x21, 0x32, 0x26, 0x26, 0x28
};
u8 peer_challenge[] = {
0x21, 0x40, 0x23, 0x24, 0x25, 0x5E, 0x26, 0x2A,
0x28, 0x29, 0x5F, 0x2B, 0x3A, 0x33, 0x7C, 0x7E
};
u8 challenge[] = { 0xD0, 0x2E, 0x43, 0x86, 0xBC, 0xE9, 0x12, 0x26 };
u8 password_hash[] = {
0x44, 0xEB, 0xBA, 0x8D, 0x53, 0x12, 0xB8, 0xD6,
0x11, 0x47, 0x44, 0x11, 0xF5, 0x69, 0x89, 0xAE
};
u8 nt_response[] = {
0x82, 0x30, 0x9E, 0xCD, 0x8D, 0x70, 0x8B, 0x5E,
0xA0, 0x8F, 0xAA, 0x39, 0x81, 0xCD, 0x83, 0x54,
0x42, 0x33, 0x11, 0x4A, 0x3D, 0x85, 0xD6, 0xDF
};
u8 password_hash_hash[] = {
0x41, 0xC0, 0x0C, 0x58, 0x4B, 0xD2, 0xD9, 0x1C,
0x40, 0x17, 0xA2, 0xA1, 0x2F, 0xA5, 0x9F, 0x3F
};
u8 authenticator_response[] = {
0x40, 0x7A, 0x55, 0x89, 0x11, 0x5F, 0xD0, 0xD6,
0x20, 0x9F, 0x51, 0x0F, 0xE9, 0xC0, 0x45, 0x66,
0x93, 0x2C, 0xDA, 0x56
};
u8 master_key[] = {
0xFD, 0xEC, 0xE3, 0x71, 0x7A, 0x8C, 0x83, 0x8C,
0xB3, 0x88, 0xE5, 0x27, 0xAE, 0x3C, 0xDD, 0x31
};
u8 send_start_key[] = {
0x8B, 0x7C, 0xDC, 0x14, 0x9B, 0x99, 0x3A, 0x1B,
0xA1, 0x18, 0xCB, 0x15, 0x3F, 0x56, 0xDC, 0xCB
};
u8 buf[32];
int errors = 0;
printf("Testing ms_funcs.c\n");
challenge_hash(peer_challenge, auth_challenge,
username, strlen(username),
buf);
if (memcmp(challenge, buf, sizeof(challenge)) != 0) {
printf("challenge_hash failed\n");
errors++;
}
nt_password_hash(password, strlen(password), buf);
if (memcmp(password_hash, buf, sizeof(password_hash)) != 0) {
printf("nt_password_hash failed\n");
errors++;
}
generate_nt_response(auth_challenge, peer_challenge,
username, strlen(username),
password, strlen(password),
buf);
if (memcmp(nt_response, buf, sizeof(nt_response)) != 0) {
printf("generate_nt_response failed\n");
errors++;
}
hash_nt_password_hash(password_hash, buf);
if (memcmp(password_hash_hash, buf, sizeof(password_hash_hash)) != 0) {
printf("hash_nt_password_hash failed\n");
errors++;
}
generate_authenticator_response(password, strlen(password),
peer_challenge, auth_challenge,
username, strlen(username),
nt_response, buf);
if (memcmp(authenticator_response, buf, sizeof(authenticator_response))
!= 0) {
printf("generate_authenticator_response failed\n");
errors++;
}
get_master_key(password_hash_hash, nt_response, buf);
if (memcmp(master_key, buf, sizeof(master_key)) != 0) {
printf("get_master_key failed\n");
errors++;
}
get_asymetric_start_key(master_key, buf, sizeof(send_start_key), 1, 1);
if (memcmp(send_start_key, buf, sizeof(send_start_key)) != 0) {
printf("get_asymetric_start_key failed\n");
errors++;
}
if (errors)
printf("FAILED! %d errors\n", errors);
return errors;
}
#endif /* TEST_MAIN_MS_FUNCS */
|
