/* Unix SMB/CIFS implementation. SMB parameters and setup Copyright (C) Andrew Tridgell 1992-1998 Modified by Jeremy Allison 1995. Copyright (C) Jeremy Allison 1995-2000. Copyright (C) Luke Kennethc Casson Leighton 1996-2000. Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003 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 3 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. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "byteorder.h" void SMBencrypt_hash(const uchar lm_hash[16], const uchar *c8, uchar p24[24]) { uchar p21[21]; memset(p21,'\0',21); memcpy(p21, lm_hash, 16); SMBOWFencrypt(p21, c8, p24); #ifdef DEBUG_PASSWORD DEBUG(100,("SMBencrypt_hash: lm#, challenge, response\n")); dump_data(100, p21, 16); dump_data(100, c8, 8); dump_data(100, p24, 24); #endif } /* This implements the X/Open SMB password encryption It takes a password ('unix' string), a 8 byte "crypt key" and puts 24 bytes of encrypted password into p24 Returns False if password must have been truncated to create LM hash */ bool SMBencrypt(const char *passwd, const uchar *c8, uchar p24[24]) { bool ret; uchar lm_hash[16]; ret = E_deshash(passwd, lm_hash); SMBencrypt_hash(lm_hash, c8, p24); return ret; } /** * Creates the MD4 Hash of the users password in NT UNICODE. * @param passwd password in 'unix' charset. * @param p16 return password hashed with md4, caller allocated 16 byte buffer */ void E_md4hash(const char *passwd, uchar p16[16]) { int len; smb_ucs2_t wpwd[129]; /* Password must be converted to NT unicode - null terminated. */ push_ucs2(NULL, wpwd, (const char *)passwd, 256, STR_UNICODE|STR_NOALIGN|STR_TERMINATE); /* Calculate length in bytes */ len = strlen_w(wpwd) * sizeof(int16); mdfour(p16, (unsigned char *)wpwd, len); ZERO_STRUCT(wpwd); } /** * Creates the MD5 Hash of a combination of 16 byte salt and 16 byte NT hash. * @param 16 byte salt. * @param 16 byte NT hash. * @param 16 byte return hashed with md5, caller allocated 16 byte buffer */ void E_md5hash(const uchar salt[16], const uchar nthash[16], uchar hash_out[16]) { struct MD5Context tctx; uchar array[32]; memset(hash_out, '\0', 16); memcpy(array, salt, 16); memcpy(&array[16], nthash, 16); MD5Init(&tctx); MD5Update(&tctx, array, 32); MD5Final(hash_out, &tctx); } /** * Creates the DES forward-only Hash of the users password in DOS ASCII charset * @param passwd password in 'unix' charset. * @param p16 return password hashed with DES, caller allocated 16 byte buffer * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True * @note p16 is filled in regardless */ bool E_deshash(const char *passwd, uchar p16[16]) { bool ret = True; fstring dospwd; ZERO_STRUCT(dospwd); /* Password must be converted to DOS charset - null terminated, uppercase. */ push_ascii(dospwd, passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE); /* Only the fisrt 14 chars are considered, password need not be null terminated. */ E_P16((const unsigned char *)dospwd, p16); if (strlen(dospwd) > 14) { ret = False; } ZERO_STRUCT(dospwd); return ret; } /** * Creates the MD4 and DES (LM) Hash of the users password. * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password. * @param passwd password in 'unix' charset. * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer * @param p16 return password hashed with des, caller allocated 16 byte buffer */ /* Does both the NT and LM owfs of a user's password */ void nt_lm_owf_gen(const char *pwd, uchar nt_p16[16], uchar p16[16]) { /* Calculate the MD4 hash (NT compatible) of the password */ memset(nt_p16, '\0', 16); E_md4hash(pwd, nt_p16); #ifdef DEBUG_PASSWORD DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n")); dump_data(120, (uint8 *)pwd, strlen(pwd)); dump_data(100, nt_p16, 16); #endif E_deshash(pwd, (uchar *)p16); #ifdef DEBUG_PASSWORD DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n")); dump_data(120, (uint8 *)pwd, strlen(pwd)); dump_data(100, p16, 16); #endif } /* Does both the NTLMv2 owfs of a user's password */ bool ntv2_owf_gen(const uchar owf[16], const char *user_in, const char *domain_in, bool upper_case_domain, /* Transform the domain into UPPER case */ uchar kr_buf[16]) { smb_ucs2_t *user; smb_ucs2_t *domain; size_t user_byte_len; size_t domain_byte_len; HMACMD5Context ctx; if (!push_ucs2_allocate(&user, user_in, &user_byte_len)) { DEBUG(0, ("push_uss2_allocate() for user failed: %s\n", strerror(errno))); return False; } if (!push_ucs2_allocate(&domain, domain_in, &domain_byte_len)) { DEBUG(0, ("push_uss2_allocate() for domain failed: %s\n", strerror(errno))); SAFE_FREE(user); return False; } strupper_w(user); if (upper_case_domain) strupper_w(domain); SMB_ASSERT(user_byte_len >= 2); SMB_ASSERT(domain_byte_len >= 2); /* We don't want null termination */ user_byte_len = user_byte_len - 2; domain_byte_len = domain_byte_len - 2; hmac_md5_init_limK_to_64(owf, 16, &ctx); hmac_md5_update((const unsigned char *)user, user_byte_len, &ctx); hmac_md5_update((const unsigned char *)domain, domain_byte_len, &ctx); hmac_md5_final(kr_buf, &ctx); #ifdef DEBUG_PASSWORD DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n")); dump_data(100, (uint8 *)user, user_byte_len); dump_data(100, (uint8 *)domain, domain_byte_len); dump_data(100, (uint8 *)owf, 16); dump_data(100, (uint8 *)kr_buf, 16); #endif SAFE_FREE(user); SAFE_FREE(domain); return True; } /* Does the des encryption from the NT or LM MD4 hash. */ void SMBOWFencrypt(const uchar passwd[16], const uchar *c8, uchar p24[24]) { uchar p21[21]; ZERO_STRUCT(p21); memcpy(p21, passwd, 16); E_P24(p21, c8, p24); } /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */ void NTLMSSPOWFencrypt(const uchar passwd[8], const uchar *ntlmchalresp, uchar p24[24]) { uchar p21[21]; memset(p21,'\0',21); memcpy(p21, passwd, 8); memset(p21 + 8, 0xbd, 8); E_P24(p21, ntlmchalresp, p24); #ifdef DEBUG_PASSWORD DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n")); dump_data(100, p21, 21); dump_data(100, ntlmchalresp, 8); dump_data(100, p24, 24); #endif } /* Does the des encryption. */ void SMBNTencrypt_hash(const uchar nt_hash[16], uchar *c8, uchar *p24) { uchar p21[21]; memset(p21,'\0',21); memcpy(p21, nt_hash, 16); SMBOWFencrypt(p21, c8, p24); #ifdef DEBUG_PASSWORD DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n")); dump_data(100, p21, 16); dump_data(100, c8, 8); dump_data(100, p24, 24); #endif } /* Does the NT MD4 hash then des encryption. Plaintext version of the above. */ void SMBNTencrypt(const char *passwd, uchar *c8, uchar *p24) { uchar nt_hash[16]; E_md4hash(passwd, nt_hash); SMBNTencrypt_hash(nt_hash, c8, p24); } /* Does the md5 encryption from the Key Response for NTLMv2. */ void SMBOWFencrypt_ntv2(const uchar kr[16], const DATA_BLOB *srv_chal, const DATA_BLOB *cli_chal, uchar resp_buf[16]) { HMACMD5Context ctx; hmac_md5_init_limK_to_64(kr, 16, &ctx); hmac_md5_update(srv_chal->data, srv_chal->length, &ctx); hmac_md5_update(cli_chal->data, cli_chal->length, &ctx); hmac_md5_final(resp_buf, &ctx); #ifdef DEBUG_PASSWORD DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n")); dump_data(100, srv_chal->data, srv_chal->length); dump_data(100, cli_chal->data, cli_chal->length); dump_data(100, resp_buf, 16); #endif } void SMBsesskeygen_ntv2(const uchar kr[16], const uchar * nt_resp, uint8 sess_key[16]) { /* a very nice, 128 bit, variable session key */ HMACMD5Context ctx; hmac_md5_init_limK_to_64(kr, 16, &ctx); hmac_md5_update(nt_resp, 16, &ctx); hmac_md5_final((unsigned char *)sess_key, &ctx); #ifdef DEBUG_PASSWORD DEBUG(100, ("SMBsesskeygen_ntv2:\n")); dump_data(100, sess_key, 16); #endif } void SMBsesskeygen_ntv1(const uchar kr[16], const uchar * nt_resp, uint8 sess_key[16]) { /* yes, this session key does not change - yes, this is a problem - but it is 128 bits */ mdfour((unsigned char *)sess_key, kr, 16); #ifdef DEBUG_PASSWORD DEBUG(100, ("SMBsesskeygen_ntv1:\n")); dump_data(100, sess_key, 16); #endif } void SMBsesskeygen_lm_sess_key(const uchar lm_hash[16], const uchar lm_resp[24], /* only uses 8 */ uint8 sess_key[16]) { uchar p24[24]; uchar partial_lm_hash[16]; memcpy(partial_lm_hash, lm_hash, 8); memset(partial_lm_hash + 8, 0xbd, 8); SMBOWFencrypt(partial_lm_hash, lm_resp, p24); memcpy(sess_key, p24, 16); #ifdef DEBUG_PASSWORD DEBUG(100, ("SMBsesskeygen_lmv1_jerry:\n")); dump_data(100, sess_key, 16); #endif } DATA_BLOB NTLMv2_generate_names_blob(const char *hostname, const char *domain) { DATA_BLOB names_blob = data_blob_null; msrpc_gen(&names_blob, "aaa", NTLMSSP_NAME_TYPE_DOMAIN, domain, NTLMSSP_NAME_TYPE_SERVER, hostname, 0, ""); return names_blob; } static DATA_BLOB NTLMv2_generate_client_data(const DATA_BLOB *names_blob) { uchar client_chal[8]; DATA_BLOB response = data_blob_null; char long_date[8]; generate_random_buffer(client_chal, sizeof(client_chal)); put_long_date(long_date, time(NULL)); /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */ msrpc_gen(&response, "ddbbdb", 0x00000101, /* Header */ 0, /* 'Reserved' */ long_date, 8, /* Timestamp */ client_chal, 8, /* client challenge */ 0, /* Unknown */ names_blob->data, names_blob->length); /* End of name list */ return response; } static DATA_BLOB NTLMv2_generate_response(const uchar ntlm_v2_hash[16], const DATA_BLOB *server_chal, const DATA_BLOB *names_blob) { uchar ntlmv2_response[16]; DATA_BLOB ntlmv2_client_data; DATA_BLOB final_response; /* NTLMv2 */ /* generate some data to pass into the response function - including the hostname and domain name of the server */ ntlmv2_client_data = NTLMv2_generate_client_data(names_blob); /* Given that data, and the challenge from the server, generate a response */ SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response); final_response = data_blob(NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length); memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response)); memcpy(final_response.data+sizeof(ntlmv2_response), ntlmv2_client_data.data, ntlmv2_client_data.length); data_blob_free(&ntlmv2_client_data); return final_response; } static DATA_BLOB LMv2_generate_response(const uchar ntlm_v2_hash[16], const DATA_BLOB *server_chal) { uchar lmv2_response[16]; DATA_BLOB lmv2_client_data = data_blob(NULL, 8); DATA_BLOB final_response = data_blob(NULL, 24); /* LMv2 */ /* client-supplied random data */ generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length); /* Given that data, and the challenge from the server, generate a response */ SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response); memcpy(final_response.data, lmv2_response, sizeof(lmv2_response)); /* after the first 16 bytes is the random data we generated above, so the server can verify us with it */ memcpy(final_response.data+sizeof(lmv2_response), lmv2_client_data.data, lmv2_client_data.length); data_blob_free(&lmv2_client_data); return final_response; } bool SMBNTLMv2encrypt_hash(const char *user, const char *domain, const uchar nt_hash[16], const DATA_BLOB *server_chal, const DATA_BLOB *names_blob, DATA_BLOB *lm_response, DATA_BLOB *nt_response, DATA_BLOB *user_session_key) { uchar ntlm_v2_hash[16]; /* We don't use the NT# directly. Instead we use it mashed up with the username and domain. This prevents username swapping during the auth exchange */ if (!ntv2_owf_gen(nt_hash, user, domain, False, ntlm_v2_hash)) { return False; } if (nt_response) { *nt_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal, names_blob); if (user_session_key) { *user_session_key = data_blob(NULL, 16); /* The NTLMv2 calculations also provide a session key, for signing etc later */ /* use only the first 16 bytes of nt_response for session key */ SMBsesskeygen_ntv2(ntlm_v2_hash, nt_response->data, user_session_key->data); } } /* LMv2 */ if (lm_response) { *lm_response = LMv2_generate_response(ntlm_v2_hash, server_chal); } return True; } /* Plaintext version of the above. */ bool SMBNTLMv2encrypt(const char *user, const char *domain, const char *password, const DATA_BLOB *server_chal, const DATA_BLOB *names_blob, DATA_BLOB *lm_response, DATA_BLOB *nt_response, DATA_BLOB *user_session_key) { uchar nt_hash[16]; E_md4hash(password, nt_hash); return SMBNTLMv2encrypt_hash(user, domain, nt_hash, server_chal, names_blob, lm_response, nt_response, user_session_key); } /*********************************************************** encode a password buffer with a unicode password. The buffer is filled with random data to make it harder to attack. ************************************************************/ bool encode_pw_buffer(uint8 buffer[516], const char *password, int string_flags) { uchar new_pw[512]; size_t new_pw_len; /* the incoming buffer can be any alignment. */ string_flags |= STR_NOALIGN; new_pw_len = push_string(NULL, new_pw, password, sizeof(new_pw), string_flags); memcpy(&buffer[512 - new_pw_len], new_pw, new_pw_len); generate_random_buffer(buffer, 512 - new_pw_len); /* * The length of the new password is in the last 4 bytes of * the data buffer. */ SIVAL(buffer, 512, new_pw_len); ZERO_STRUCT(new_pw); return True; } /*********************************************************** decode a password buffer *new_pw_len is the length in bytes of the possibly mulitbyte returned password including termination. ************************************************************/ bool decode_pw_buffer(TALLOC_CTX *ctx, uint8 in_buffer[516], char **pp_new_pwrd, uint32 *new_pw_len, int string_flags) { int byte_len=0; *pp_new_pwrd = NULL; *new_pw_len = 0; /* the incoming buffer can be any alignment. */ string_flags |= STR_NOALIGN; /* Warning !!! : This function is called from some rpc call. The password IN the buffer may be a UNICODE string. The password IN new_pwrd is an ASCII string If you reuse that code somewhere else check first. */ /* The length of the new password is in the last 4 bytes of the data buffer. */ byte_len = IVAL(in_buffer, 512); #ifdef DEBUG_PASSWORD dump_data(100, in_buffer, 516); #endif /* Password cannot be longer than the size of the password buffer */ if ( (byte_len < 0) || (byte_len > 512)) { DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len)); DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n")); return false; } /* decode into the return buffer. */ *new_pw_len = pull_string_talloc(ctx, NULL, 0, pp_new_pwrd, &in_buffer[512 - byte_len], byte_len, string_flags); if (!*pp_new_pwrd || *new_pw_len == 0) { DEBUG(0, ("decode_pw_buffer: pull_string_talloc failed\n")); return false; } #ifdef DEBUG_PASSWORD DEBUG(100,("decode_pw_buffer: new_pwrd: ")); dump_data(100, (uint8 *)*pp_new_pwrd, *new_pw_len); DEBUG(100,("multibyte len:%d\n", *new_pw_len)); DEBUG(100,("original char len:%d\n", byte_len/2)); #endif return true; } /*********************************************************** Decode an arc4 encrypted password change buffer. ************************************************************/ void encode_or_decode_arc4_passwd_buffer(unsigned char pw_buf[532], const DATA_BLOB *psession_key) { struct MD5Context tctx; unsigned char key_out[16]; /* Confounder is last 16 bytes. */ MD5Init(&tctx); MD5Update(&tctx, &pw_buf[516], 16); MD5Update(&tctx, psession_key->data, psession_key->length); MD5Final(key_out, &tctx); /* arc4 with key_out. */ SamOEMhash(pw_buf, key_out, 516); } /*********************************************************** Encrypt/Decrypt used for LSA secrets and trusted domain passwords. ************************************************************/ void sess_crypt_blob(DATA_BLOB *out, const DATA_BLOB *in, const DATA_BLOB *session_key, int forward) { int i, k; for (i=0,k=0; i<in->length; i += 8, k += 7) { uint8 bin[8], bout[8], key[7]; memset(bin, 0, 8); memcpy(bin, &in->data[i], MIN(8, in->length-i)); if (k + 7 > session_key->length) { k = (session_key->length - k); } memcpy(key, &session_key->data[k], 7); des_crypt56(bout, bin, key, forward?1:0); memcpy(&out->data[i], bout, MIN(8, in->length-i)); } } /* Decrypts password-blob with session-key * @param nt_hash NT hash for the session key * @param data_in DATA_BLOB encrypted password * * Returns cleartext password in CH_UNIX * Caller must free the returned string */ char *decrypt_trustdom_secret(uint8_t nt_hash[16], DATA_BLOB *data_in) { DATA_BLOB data_out, sess_key; uint32_t length; uint32_t version; fstring cleartextpwd; if (!data_in || !nt_hash) return NULL; /* hashed twice with md4 */ mdfour(nt_hash, nt_hash, 16); /* 16-Byte session-key */ sess_key = data_blob(nt_hash, 16); if (sess_key.data == NULL) return NULL; data_out = data_blob(NULL, data_in->length); if (data_out.data == NULL) return NULL; /* decrypt with des3 */ sess_crypt_blob(&data_out, data_in, &sess_key, 0); /* 4 Byte length, 4 Byte version */ length = IVAL(data_out.data, 0); version = IVAL(data_out.data, 4); if (length > data_in->length - 8) { DEBUG(0,("decrypt_trustdom_secret: invalid length (%d)\n", length)); return NULL; } if (version != 1) { DEBUG(0,("decrypt_trustdom_secret: unknown version number (%d)\n", version)); return NULL; } rpcstr_pull(cleartextpwd, data_out.data + 8, sizeof(fstring), length, 0 ); #ifdef DEBUG_PASSWORD DEBUG(100,("decrypt_trustdom_secret: length is: %d, version is: %d, password is: %s\n", length, version, cleartextpwd)); #endif data_blob_free(&data_out); data_blob_free(&sess_key); return SMB_STRDUP(cleartextpwd); } /* encode a wkssvc_PasswordBuffer: * * similar to samr_CryptPasswordEx. Different: 8byte confounder (instead of * 16byte), confounder in front of the 516 byte buffer (instead of after that * buffer), calling MD5Update() first with session_key and then with confounder * (vice versa in samr) - Guenther */ void encode_wkssvc_join_password_buffer(TALLOC_CTX *mem_ctx, const char *pwd, DATA_BLOB *session_key, struct wkssvc_PasswordBuffer **pwd_buf) { uint8_t buffer[516]; struct MD5Context ctx; struct wkssvc_PasswordBuffer *my_pwd_buf = NULL; DATA_BLOB confounded_session_key; int confounder_len = 8; uint8_t confounder[8]; my_pwd_buf = talloc_zero(mem_ctx, struct wkssvc_PasswordBuffer); if (!my_pwd_buf) { return; } confounded_session_key = data_blob_talloc(mem_ctx, NULL, 16); encode_pw_buffer(buffer, pwd, STR_UNICODE); generate_random_buffer((uint8_t *)confounder, confounder_len); MD5Init(&ctx); MD5Update(&ctx, session_key->data, session_key->length); MD5Update(&ctx, confounder, confounder_len); MD5Final(confounded_session_key.data, &ctx); SamOEMhashBlob(buffer, 516, &confounded_session_key); memcpy(&my_pwd_buf->data[0], confounder, confounder_len); memcpy(&my_pwd_buf->data[8], buffer, 516); data_blob_free(&confounded_session_key); *pwd_buf = my_pwd_buf; } WERROR decode_wkssvc_join_password_buffer(TALLOC_CTX *mem_ctx, struct wkssvc_PasswordBuffer *pwd_buf, DATA_BLOB *session_key, char **pwd) { uint8_t buffer[516]; struct MD5Context ctx; uint32_t pwd_len; DATA_BLOB confounded_session_key; int confounder_len = 8; uint8_t confounder[8]; *pwd = NULL; if (!pwd_buf) { return WERR_BAD_PASSWORD; } if (session_key->length != 16) { DEBUG(10,("invalid session key\n")); return WERR_BAD_PASSWORD; } confounded_session_key = data_blob_talloc(mem_ctx, NULL, 16); memcpy(&confounder, &pwd_buf->data[0], confounder_len); memcpy(&buffer, &pwd_buf->data[8], 516); MD5Init(&ctx); MD5Update(&ctx, session_key->data, session_key->length); MD5Update(&ctx, confounder, confounder_len); MD5Final(confounded_session_key.data, &ctx); SamOEMhashBlob(buffer, 516, &confounded_session_key); if (!decode_pw_buffer(mem_ctx, buffer, pwd, &pwd_len, STR_UNICODE)) { data_blob_free(&confounded_session_key); return WERR_BAD_PASSWORD; } data_blob_free(&confounded_session_key); return WERR_OK; }