| /* |
| * WPA Supplicant / shared MSCHAPV2 helper functions / RFC 2433 / RFC 2759 |
| * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi> |
| * |
| * This software may be distributed under the terms of the BSD license. |
| * See README for more details. |
| */ |
| |
| #include "includes.h" |
| |
| #include "common.h" |
| #include "sha1.h" |
| #include "ms_funcs.h" |
| #include "crypto.h" |
| |
| /** |
| * utf8_to_ucs2 - Convert UTF-8 string to UCS-2 encoding |
| * @utf8_string: UTF-8 string (IN) |
| * @utf8_string_len: Length of utf8_string (IN) |
| * @ucs2_buffer: UCS-2 buffer (OUT) |
| * @ucs2_buffer_size: Length of UCS-2 buffer (IN) |
| * @ucs2_string_size: Number of 2-byte words in the resulting UCS-2 string |
| * Returns: 0 on success, -1 on failure |
| */ |
| static int utf8_to_ucs2(const u8 *utf8_string, size_t utf8_string_len, |
| u8 *ucs2_buffer, size_t ucs2_buffer_size, |
| size_t *ucs2_string_size) |
| { |
| size_t i, j; |
| |
| for (i = 0, j = 0; i < utf8_string_len; i++) { |
| u8 c = utf8_string[i]; |
| if (j >= ucs2_buffer_size) { |
| /* input too long */ |
| return -1; |
| } |
| if (c <= 0x7F) { |
| WPA_PUT_LE16(ucs2_buffer + j, c); |
| j += 2; |
| } else if (i == utf8_string_len - 1 || |
| j >= ucs2_buffer_size - 1) { |
| /* incomplete surrogate */ |
| return -1; |
| } else { |
| u8 c2 = utf8_string[++i]; |
| if ((c & 0xE0) == 0xC0) { |
| /* two-byte encoding */ |
| WPA_PUT_LE16(ucs2_buffer + j, |
| ((c & 0x1F) << 6) | (c2 & 0x3F)); |
| j += 2; |
| } else if (i == utf8_string_len || |
| j >= ucs2_buffer_size - 1) { |
| /* incomplete surrogate */ |
| return -1; |
| } else { |
| /* three-byte encoding */ |
| u8 c3 = utf8_string[++i]; |
| WPA_PUT_LE16(ucs2_buffer + j, |
| ((c & 0xF) << 12) | |
| ((c2 & 0x3F) << 6) | (c3 & 0x3F)); |
| } |
| } |
| } |
| |
| if (ucs2_string_size) |
| *ucs2_string_size = j / 2; |
| return 0; |
| } |
| |
| |
| /** |
| * 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) |
| * Returns: 0 on success, -1 on failure |
| */ |
| static int 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; |
| |
| if (sha1_vector(3, addr, len, hash)) |
| return -1; |
| os_memcpy(challenge, hash, 8); |
| return 0; |
| } |
| |
| |
| /** |
| * nt_password_hash - NtPasswordHash() - RFC 2759, Sect. 8.3 |
| * @password: 0-to-256-unicode-char Password (IN; UTF-8) |
| * @password_len: Length of password |
| * @password_hash: 16-octet PasswordHash (OUT) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int nt_password_hash(const u8 *password, size_t password_len, |
| u8 *password_hash) |
| { |
| u8 buf[512], *pos; |
| size_t len, max_len; |
| |
| max_len = sizeof(buf); |
| if (utf8_to_ucs2(password, password_len, buf, max_len, &len) < 0) |
| return -1; |
| |
| len *= 2; |
| pos = buf; |
| return 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) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int hash_nt_password_hash(const u8 *password_hash, u8 *password_hash_hash) |
| { |
| size_t len = 16; |
| return 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]; |
| os_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_challenge: 16-octet PeerChallenge (IN) |
| * @username: 0-to-256-char UserName (IN) |
| * @username_len: Length of username |
| * @password: 0-to-256-unicode-char Password (IN; UTF-8) |
| * @password_len: Length of password |
| * @response: 24-octet Response (OUT) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int 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]; |
| |
| if (challenge_hash(peer_challenge, auth_challenge, username, |
| username_len, challenge)) |
| return -1; |
| if (nt_password_hash(password, password_len, password_hash)) |
| return -1; |
| challenge_response(challenge, password_hash, response); |
| return 0; |
| } |
| |
| |
| /** |
| * generate_nt_response_pwhash - GenerateNTResponse() - RFC 2759, Sect. 8.1 |
| * @auth_challenge: 16-octet AuthenticatorChallenge (IN) |
| * @peer_challenge: 16-octet PeerChallenge (IN) |
| * @username: 0-to-256-char UserName (IN) |
| * @username_len: Length of username |
| * @password_hash: 16-octet PasswordHash (IN) |
| * @response: 24-octet Response (OUT) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int generate_nt_response_pwhash(const u8 *auth_challenge, |
| const u8 *peer_challenge, |
| const u8 *username, size_t username_len, |
| const u8 *password_hash, |
| u8 *response) |
| { |
| u8 challenge[8]; |
| |
| if (challenge_hash(peer_challenge, auth_challenge, |
| username, username_len, |
| challenge)) |
| return -1; |
| challenge_response(challenge, password_hash, response); |
| return 0; |
| } |
| |
| |
| /** |
| * generate_authenticator_response_pwhash - GenerateAuthenticatorResponse() - RFC 2759, Sect. 8.7 |
| * @password_hash: 16-octet PasswordHash (IN) |
| * @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=hexdump_of_response) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int generate_authenticator_response_pwhash( |
| const u8 *password_hash, |
| 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_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; |
| |
| if (hash_nt_password_hash(password_hash, password_hash_hash)) |
| return -1; |
| if (sha1_vector(3, addr1, len1, response)) |
| return -1; |
| |
| if (challenge_hash(peer_challenge, auth_challenge, username, |
| username_len, challenge)) |
| return -1; |
| return sha1_vector(3, addr2, len2, response); |
| } |
| |
| |
| /** |
| * generate_authenticator_response - GenerateAuthenticatorResponse() - RFC 2759, Sect. 8.7 |
| * @password: 0-to-256-unicode-char Password (IN; UTF-8) |
| * @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=hexdump_of_response) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int 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) |
| { |
| u8 password_hash[16]; |
| if (nt_password_hash(password, password_len, password_hash)) |
| return -1; |
| return generate_authenticator_response_pwhash( |
| password_hash, peer_challenge, auth_challenge, |
| username, username_len, nt_response, response); |
| } |
| |
| |
| /** |
| * nt_challenge_response - NtChallengeResponse() - RFC 2433, Sect. A.5 |
| * @challenge: 8-octet Challenge (IN) |
| * @password: 0-to-256-unicode-char Password (IN; UTF-8) |
| * @password_len: Length of password |
| * @response: 24-octet Response (OUT) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int nt_challenge_response(const u8 *challenge, const u8 *password, |
| size_t password_len, u8 *response) |
| { |
| u8 password_hash[16]; |
| if (nt_password_hash(password, password_len, password_hash)) |
| return -1; |
| challenge_response(challenge, password_hash, response); |
| return 0; |
| } |
| |
| |
| /** |
| * 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) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int 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; |
| |
| if (sha1_vector(3, addr, len, hash)) |
| return -1; |
| os_memcpy(master_key, hash, 16); |
| return 0; |
| } |
| |
| |
| /** |
| * 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) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int 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; |
| |
| if (sha1_vector(4, addr, len, digest)) |
| return -1; |
| |
| if (session_key_len > SHA1_MAC_LEN) |
| session_key_len = SHA1_MAC_LEN; |
| os_memcpy(session_key, digest, session_key_len); |
| return 0; |
| } |
| |
| |
| #define PWBLOCK_LEN 516 |
| |
| /** |
| * encrypt_pw_block_with_password_hash - EncryptPwBlockWithPasswordHash() - RFC 2759, Sect. 8.10 |
| * @password: 0-to-256-unicode-char Password (IN; UTF-8) |
| * @password_len: Length of password |
| * @password_hash: 16-octet PasswordHash (IN) |
| * @pw_block: 516-byte PwBlock (OUT) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int encrypt_pw_block_with_password_hash( |
| const u8 *password, size_t password_len, |
| const u8 *password_hash, u8 *pw_block) |
| { |
| size_t ucs2_len, offset; |
| u8 *pos; |
| |
| os_memset(pw_block, 0, PWBLOCK_LEN); |
| |
| if (utf8_to_ucs2(password, password_len, pw_block, 512, &ucs2_len) < 0) |
| return -1; |
| |
| if (ucs2_len > 256) |
| return -1; |
| |
| offset = (256 - ucs2_len) * 2; |
| if (offset != 0) { |
| os_memmove(pw_block + offset, pw_block, ucs2_len * 2); |
| if (os_get_random(pw_block, offset) < 0) |
| return -1; |
| } |
| /* |
| * 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_skip(password_hash, 16, 0, pw_block, PWBLOCK_LEN); |
| return 0; |
| } |
| |
| |
| /** |
| * new_password_encrypted_with_old_nt_password_hash - NewPasswordEncryptedWithOldNtPasswordHash() - RFC 2759, Sect. 8.9 |
| * @new_password: 0-to-256-unicode-char NewPassword (IN; UTF-8) |
| * @new_password_len: Length of new_password |
| * @old_password: 0-to-256-unicode-char OldPassword (IN; UTF-8) |
| * @old_password_len: Length of old_password |
| * @encrypted_pw_block: 516-octet EncryptedPwBlock (OUT) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int 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]; |
| |
| if (nt_password_hash(old_password, old_password_len, password_hash)) |
| return -1; |
| if (encrypt_pw_block_with_password_hash(new_password, new_password_len, |
| password_hash, |
| encrypted_pw_block)) |
| return -1; |
| return 0; |
| } |
| |
| |
| /** |
| * 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) |
| */ |
| 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; UTF-8) |
| * @new_password_len: Length of new_password |
| * @old_password: 0-to-256-unicode-char OldPassword (IN; UTF-8) |
| * @old_password_len: Length of old_password |
| * @encrypted_password_hash: 16-octet EncryptedPasswordHash (OUT) |
| * Returns: 0 on success, -1 on failure |
| */ |
| int 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]; |
| |
| if (nt_password_hash(old_password, old_password_len, |
| old_password_hash) || |
| nt_password_hash(new_password, new_password_len, |
| new_password_hash)) |
| return -1; |
| nt_password_hash_encrypted_with_block(old_password_hash, |
| new_password_hash, |
| encrypted_password_hash); |
| return 0; |
| } |
