/* * WPA Supplicant / shared MSCHAPV2 helper functions / RFC 2433 / RFC 2759 * Copyright (c) 2004-2006, Jouni Malinen * * 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 #include #include #include "common.h" #include "sha1.h" #include "ms_funcs.h" #include "crypto.h" #include "rc4.h" /** * challenge_hash - ChallengeHash() - RFC 2759, Sect. 8.2 * @peer_challenge: 16-octet PeerChallenge (IN) * @auth_challenge: 16-octet AuthenticatorChallenge (IN) * @username: 0-to-256-char UserName (IN) * @username_len: Length of username * @challenge: 8-octet Challenge (OUT) */ static void challenge_hash(const u8 *peer_challenge, const u8 *auth_challenge, const 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); } /** * nt_password_hash - NtPasswordHash() - RFC 2759, Sect. 8.3 * @password: 0-to-256-unicode-char Password (IN; ASCII) * @password_len: Length of password * @password_hash: 16-octet PasswordHash (OUT) */ void nt_password_hash(const u8 *password, size_t password_len, u8 *password_hash) { u8 buf[512], *pos; size_t i, len; if (password_len > 256) return; /* Convert password into unicode */ for (i = 0; i < password_len; i++) { buf[2 * i] = password[i]; buf[2 * i + 1] = 0; } len = password_len * 2; pos = buf; md4_vector(1, (const u8 **) &pos, &len, password_hash); } /** * hash_nt_password_hash - HashNtPasswordHash() - RFC 2759, Sect. 8.4 * @password_hash: 16-octet PasswordHash (IN) * @password_hash_hash: 16-octet PasswordHashHash (OUT) */ void hash_nt_password_hash(const u8 *password_hash, u8 *password_hash_hash) { size_t len = 16; md4_vector(1, &password_hash, &len, password_hash_hash); } /** * challenge_response - ChallengeResponse() - RFC 2759, Sect. 8.5 * @challenge: 8-octet Challenge (IN) * @password_hash: 16-octet PasswordHash (IN) * @response: 24-octet Response (OUT) */ void challenge_response(const u8 *challenge, const 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); } /** * generate_nt_response - GenerateNTResponse() - RFC 2759, Sect. 8.1 * @auth_challenge: 16-octet AuthenticatorChallenge (IN) * @peer_hallenge: 16-octet PeerChallenge (IN) * @username: 0-to-256-char UserName (IN) * @username_len: Length of username * @password: 0-to-256-unicode-char Password (IN; ASCII) * @password_len: Length of password * @response: 24-octet Response (OUT) */ void generate_nt_response(const u8 *auth_challenge, const u8 *peer_challenge, const u8 *username, size_t username_len, const 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); } /** * generate_authenticator_response - GenerateAuthenticatorResponse() - RFC 2759, Sect. 8.7 * @password: 0-to-256-unicode-char Password (IN) * @password_len: Length of password * @nt_response: 24-octet NT-Response (IN) * @peer_challenge: 16-octet PeerChallenge (IN) * @auth_challenge: 16-octet AuthenticatorChallenge (IN) * @username: 0-to-256-char UserName (IN) * @username_len: Length of username * @response: 20-octet AuthenticatorResponse (OUT) (note: this value is usually * encoded as a 42-octet ASCII string (S=) */ void generate_authenticator_response(const u8 *password, size_t password_len, const u8 *peer_challenge, const u8 *auth_challenge, const u8 *username, size_t username_len, const 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); } /** * nt_challenge_response - NtChallengeResponse() - RFC 2433, Sect. A.5 * @challenge: 8-octet Challenge (IN) * @password: 0-to-256-unicode-char Password (IN; ASCII) * @password_len: Length of password * @response: 24-octet Response (OUT) */ void nt_challenge_response(const u8 *challenge, const 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); } /** * get_master_key - GetMasterKey() - RFC 3079, Sect. 3.4 * @password_hash_hash: 16-octet PasswordHashHash (IN) * @nt_response: 24-octet NTResponse (IN) * @master_key: 16-octet MasterKey (OUT) */ 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) }; u8 hash[SHA1_MAC_LEN]; addr[0] = password_hash_hash; addr[1] = nt_response; addr[2] = magic1; sha1_vector(3, addr, len, hash); memcpy(master_key, hash, 16); } /** * get_asymetric_start_key - GetAsymetricStartKey() - RFC 3079, Sect. 3.4 * @master_key: 16-octet MasterKey (IN) * @session_key: 8-to-16 octet SessionKey (OUT) * @session_key_len: SessionKeyLength (Length of session_key) (IN) * @is_send: IsSend (IN, BOOLEAN) * @is_server: IsServer (IN, BOOLEAN) */ 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); } #define PWBLOCK_LEN 516 /** * encrypt_pw_block_with_password_hash - EncryptPwBlockWithPasswordHash() - RFC 2759, Sect. 8.10 * @password: 0-to-256-unicode-char Password (IN; ASCII) * @password_len: Length of password * @password_hash: 16-octet PasswordHash (IN) * @pw_block: 516-byte PwBlock (OUT) */ static void encrypt_pw_block_with_password_hash( const u8 *password, size_t password_len, const u8 *password_hash, u8 *pw_block) { size_t i, offset; u8 *pos; if (password_len > 256) return; memset(pw_block, 0, PWBLOCK_LEN); offset = (256 - password_len) * 2; hostapd_get_rand(pw_block, offset); for (i = 0; i < password_len; i++) pw_block[offset + i * 2] = password[i]; /* * PasswordLength is 4 octets, but since the maximum password length is * 256, only first two (in little endian byte order) can be non-zero. */ pos = &pw_block[2 * 256]; WPA_PUT_LE16(pos, password_len * 2); rc4(pw_block, PWBLOCK_LEN, password_hash, 16); } /** * new_password_encrypted_with_old_nt_password_hash - NewPasswordEncryptedWithOldNtPasswordHash() - RFC 2759, Sect. 8.9 * @new_password: 0-to-256-unicode-char NewPassword (IN; ASCII) * @new_password_len: Length of new_password * @old_password: 0-to-256-unicode-char OldPassword (IN; ASCII) * @old_password_len: Length of old_password * @encrypted_pw_block: 516-octet EncryptedPwBlock (OUT) */ void new_password_encrypted_with_old_nt_password_hash( const u8 *new_password, size_t new_password_len, const u8 *old_password, size_t old_password_len, u8 *encrypted_pw_block) { u8 password_hash[16]; nt_password_hash(old_password, old_password_len, password_hash); encrypt_pw_block_with_password_hash(new_password, new_password_len, password_hash, encrypted_pw_block); } /** * nt_password_hash_encrypted_with_block - NtPasswordHashEncryptedWithBlock() - RFC 2759, Sect 8.13 * @password_hash: 16-octer PasswordHash (IN) * @block: 16-octet Block (IN) * @cypher: 16-octer Cypher (OUT) */ static void nt_password_hash_encrypted_with_block(const u8 *password_hash, const u8 *block, u8 *cypher) { des_encrypt(password_hash, block, cypher); des_encrypt(password_hash + 8, block + 7, cypher + 8); } /** * old_nt_password_hash_encrypted_with_new_nt_password_hash - OldNtPasswordHashEncryptedWithNewNtPasswordHash() - RFC 2759, Sect. 8.12 * @new_password: 0-to-256-unicode-char NewPassword (IN; ASCII) * @new_password_len: Length of new_password * @old_password: 0-to-256-unicode-char OldPassword (IN; ASCII) * @old_password_len: Length of old_password * @encrypted_password_ash: 16-octet EncryptedPasswordHash (OUT) */ void old_nt_password_hash_encrypted_with_new_nt_password_hash( const u8 *new_password, size_t new_password_len, const u8 *old_password, size_t old_password_len, u8 *encrypted_password_hash) { u8 old_password_hash[16], new_password_hash[16]; nt_password_hash(old_password, old_password_len, old_password_hash); nt_password_hash(new_password, new_password_len, new_password_hash); nt_password_hash_encrypted_with_block(old_password_hash, new_password_hash, encrypted_password_hash); } #ifdef TEST_MAIN_MS_FUNCS #include "rc4.c" 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 */