/* 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" #include "byteorder.h" /* 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 */ void SMBencrypt(const char *passwd, const uchar *c8, uchar p24[24]) { uchar p21[21]; memset(p21,'\0',21); E_deshash(passwd, p21); SMBOWFencrypt(p21, c8, p24); #ifdef DEBUG_PASSWORD DEBUG(100,("SMBencrypt: lm#, challenge, response\n")); dump_data(100, (char *)p21, 16); dump_data(100, (const char *)c8, 8); dump_data(100, (char *)p24, 24); #endif } /** * 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 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 */ void E_deshash(const char *passwd, uchar p16[16]) { fstring dospwd; ZERO_STRUCT(dospwd); ZERO_STRUCTP(p16); /* Password must be converted to DOS charset - null terminated, uppercase. */ push_ascii(dospwd, (const char *)passwd, sizeof(dospwd), STR_UPPER|STR_TERMINATE); /* Only the fisrt 14 chars are considered, password need not be null terminated. */ E_P16(dospwd, p16); ZERO_STRUCT(dospwd); } /** * 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, pwd, strlen(pwd)); dump_data(100, (char *)nt_p16, 16); #endif E_deshash(pwd, (uchar *)p16); #ifdef DEBUG_PASSWORD DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n")); dump_data(120, pwd, strlen(pwd)); dump_data(100, (char *)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, uchar kr_buf[16]) { smb_ucs2_t *user; smb_ucs2_t *domain; size_t user_byte_len; size_t domain_byte_len; HMACMD5Context ctx; user_byte_len = push_ucs2_allocate(&user, user_in); if (user_byte_len == (size_t)-1) { DEBUG(0, ("push_uss2_allocate() for user returned -1 (probably malloc() failure)\n")); return False; } domain_byte_len = push_ucs2_allocate(&domain, domain_in); if (domain_byte_len == (size_t)-1) { DEBUG(0, ("push_uss2_allocate() for domain returned -1 (probably malloc() failure)\n")); return False; } strupper_w(user); 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, (const char *)user, user_byte_len); dump_data(100, (const char *)domain, domain_byte_len); dump_data(100, owf, 16); dump_data(100, 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, (char *)p21, 21); dump_data(100, (const char *)ntlmchalresp, 8); dump_data(100, (char *)p24, 24); #endif } /* Does the NT MD4 hash then des encryption. */ void SMBNTencrypt(const char *passwd, uchar *c8, uchar *p24) { uchar p21[21]; memset(p21,'\0',21); E_md4hash(passwd, p21); SMBOWFencrypt(p21, c8, p24); #ifdef DEBUG_PASSWORD DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n")); dump_data(100, (char *)p21, 16); dump_data(100, (char *)c8, 8); dump_data(100, (char *)p24, 24); #endif } BOOL make_oem_passwd_hash(char data[516], const char *passwd, uchar old_pw_hash[16], BOOL unicode) { int new_pw_len = strlen(passwd) * (unicode ? 2 : 1); if (new_pw_len > 512) { DEBUG(0,("make_oem_passwd_hash: new password is too long.\n")); return False; } /* * Now setup the data area. * We need to generate a random fill * for this area to make it harder to * decrypt. JRA. */ generate_random_buffer((unsigned char *)data, 516, False); push_string(NULL, &data[512 - new_pw_len], passwd, new_pw_len, STR_NOALIGN | (unicode?STR_UNICODE:STR_ASCII)); SIVAL(data, 512, new_pw_len); #ifdef DEBUG_PASSWORD DEBUG(100,("make_oem_passwd_hash\n")); dump_data(100, data, 516); #endif SamOEMhash( (unsigned char *)data, (unsigned char *)old_pw_hash, 516); return True; } /* Does the md5 encryption from the NT hash 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]) { 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]) { mdfour((unsigned char *)sess_key, kr, 16); #ifdef DEBUG_PASSWORD DEBUG(100, ("SMBsesskeygen_ntv1:\n")); dump_data(100, sess_key, 16); #endif } DATA_BLOB NTLMv2_generate_response(uchar ntlm_v2_hash[16], DATA_BLOB server_chal, size_t client_chal_length) { uchar ntlmv2_response[16]; DATA_BLOB ntlmv2_client_data; DATA_BLOB final_response; /* NTLMv2 */ /* We also get to specify some random data */ ntlmv2_client_data = data_blob(NULL, client_chal_length); generate_random_buffer(ntlmv2_client_data.data, ntlmv2_client_data.length, False); /* Given that data, and the challenge from the server, generate a response */ SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, ntlmv2_client_data, ntlmv2_response); /* put it into nt_response, for the code below to put into the packet */ final_response = data_blob(NULL, ntlmv2_client_data.length + sizeof(ntlmv2_response)); memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_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(ntlmv2_response), ntlmv2_client_data.data, ntlmv2_client_data.length); data_blob_free(&ntlmv2_client_data); return final_response; } BOOL SMBNTLMv2encrypt(const char *user, const char *domain, const char *password, const DATA_BLOB server_chal, DATA_BLOB *lm_response, DATA_BLOB *nt_response, DATA_BLOB *session_key) { uchar nt_hash[16]; uchar ntlm_v2_hash[16]; E_md4hash(password, nt_hash); /* 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, ntlm_v2_hash)) { return False; } *nt_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal, 64 /* pick a number, > 8 */); /* LMv2 */ *lm_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal, 8); *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, session_key->data); return True; } /*********************************************************** encode a password buffer. The caller gets to figure out what to put in it. ************************************************************/ BOOL encode_pw_buffer(char buffer[516], char *new_pw, int new_pw_length) { generate_random_buffer((unsigned char *)buffer, 516, True); memcpy(&buffer[512 - new_pw_length], new_pw, new_pw_length); /* * The length of the new password is in the last 4 bytes of * the data buffer. */ SIVAL(buffer, 512, new_pw_length); 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(char in_buffer[516], char *new_pwrd, int new_pwrd_size, uint32 *new_pw_len) { int byte_len=0; /* Warning !!! : This function is called from some rpc call. The password IN the buffer is 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 128 characters */ if ( (byte_len < 0) || (byte_len > new_pwrd_size - 1)) { 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. Buffer must be a pstring */ *new_pw_len = pull_string(NULL, new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size, byte_len, STR_UNICODE); #ifdef DEBUG_PASSWORD DEBUG(100,("decode_pw_buffer: new_pwrd: ")); dump_data(100, (char *)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; }