/* 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 "system/time.h" #include "../libcli/auth/msrpc_parse.h" #include "../lib/crypto/crypto.h" #include "../libcli/auth/libcli_auth.h" #include "../librpc/gen_ndr/ntlmssp.h" void SMBencrypt_hash(const uint8_t lm_hash[16], const uint8_t *c8, uint8_t p24[24]) { uint8_t 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 uint8_t *c8, uint8_t p24[24]) { bool ret; uint8_t 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 */ bool E_md4hash(const char *passwd, uint8_t p16[16]) { size_t len; smb_ucs2_t *wpwd; bool ret; ret = push_ucs2_talloc(NULL, &wpwd, passwd, &len); if (!ret || len < 2) { /* We don't want to return fixed data, as most callers * don't check */ mdfour(p16, (const uint8_t *)passwd, strlen(passwd)); return false; } len -= 2; mdfour(p16, (const uint8_t *)wpwd, len); talloc_free(wpwd); return true; } /** * 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 uint8_t salt[16], const uint8_t nthash[16], uint8_t hash_out[16]) { struct MD5Context tctx; MD5Init(&tctx); MD5Update(&tctx, salt, 16); MD5Update(&tctx, nthash, 16); 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, uint8_t p16[16]) { bool ret = true; char dospwd[256]; ZERO_STRUCT(dospwd); /* Password must be converted to DOS charset - null terminated, uppercase. */ push_string(dospwd, passwd, sizeof(dospwd), STR_ASCII|STR_UPPER|STR_TERMINATE); /* Only the first 14 chars are considered, password need not be null terminated. */ E_P16((const uint8_t *)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, uint8_t nt_p16[16], uint8_t 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, (const uint8_t *)pwd, strlen(pwd)); dump_data(100, nt_p16, 16); #endif E_deshash(pwd, (uint8_t *)p16); #ifdef DEBUG_PASSWORD DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n")); dump_data(120, (const uint8_t *)pwd, strlen(pwd)); dump_data(100, p16, 16); #endif } /* Does both the NTLMv2 owfs of a user's password */ bool ntv2_owf_gen(const uint8_t owf[16], const char *user_in, const char *domain_in, bool upper_case_domain, /* Transform the domain into UPPER case */ uint8_t kr_buf[16]) { smb_ucs2_t *user; smb_ucs2_t *domain; size_t user_byte_len; size_t domain_byte_len; bool ret; HMACMD5Context ctx; TALLOC_CTX *mem_ctx = talloc_init("ntv2_owf_gen for %s\\%s", domain_in, user_in); if (!mem_ctx) { return false; } if (!user_in) { user_in = ""; } if (!domain_in) { domain_in = ""; } user_in = strupper_talloc(mem_ctx, user_in); if (user_in == NULL) { talloc_free(mem_ctx); return false; } if (upper_case_domain) { domain_in = strupper_talloc(mem_ctx, domain_in); if (domain_in == NULL) { talloc_free(mem_ctx); return false; } } ret = push_ucs2_talloc(mem_ctx, &user, user_in, &user_byte_len ); if (!ret) { DEBUG(0, ("push_uss2_talloc() for user failed)\n")); talloc_free(mem_ctx); return false; } ret = push_ucs2_talloc(mem_ctx, &domain, domain_in, &domain_byte_len); if (!ret) { DEBUG(0, ("push_ucs2_talloc() for domain failed\n")); talloc_free(mem_ctx); return false; } 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((uint8_t *)user, user_byte_len, &ctx); hmac_md5_update((uint8_t *)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_t *)user, user_byte_len); dump_data(100, (uint8_t *)domain, domain_byte_len); dump_data(100, owf, 16); dump_data(100, kr_buf, 16); #endif talloc_free(mem_ctx); return true; } /* Does the des encryption from the NT or LM MD4 hash. */ void SMBOWFencrypt(const uint8_t passwd[16], const uint8_t *c8, uint8_t p24[24]) { uint8_t p21[21]; ZERO_STRUCT(p21); memcpy(p21, passwd, 16); E_P24(p21, c8, p24); } /* Does the des encryption. */ void SMBNTencrypt_hash(const uint8_t nt_hash[16], uint8_t *c8, uint8_t *p24) { uint8_t 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, uint8_t *c8, uint8_t *p24) { uint8_t 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 uint8_t kr[16], const DATA_BLOB *srv_chal, const DATA_BLOB *smbcli_chal, uint8_t 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(smbcli_chal->data, smbcli_chal->length, &ctx); hmac_md5_final(resp_buf, &ctx); #ifdef DEBUG_PASSWORD DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n")); dump_data(100, srv_chal->data, srv_chal->length); dump_data(100, smbcli_chal->data, smbcli_chal->length); dump_data(100, resp_buf, 16); #endif } void SMBsesskeygen_ntv2(const uint8_t kr[16], const uint8_t * nt_resp, uint8_t 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((uint8_t *)sess_key, &ctx); #ifdef DEBUG_PASSWORD DEBUG(100, ("SMBsesskeygen_ntv2:\n")); dump_data(100, sess_key, 16); #endif } void SMBsesskeygen_ntv1(const uint8_t kr[16], uint8_t sess_key[16]) { /* yes, this session key does not change - yes, this is a problem - but it is 128 bits */ mdfour((uint8_t *)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 uint8_t lm_hash[16], const uint8_t lm_resp[24], /* only uses 8 */ uint8_t sess_key[16]) { /* Calculate the LM session key (effective length 40 bits, but changes with each session) */ uint8_t p24[24]; uint8_t partial_lm_hash[14]; memcpy(partial_lm_hash, lm_hash, 8); memset(partial_lm_hash + 8, 0xbd, 6); des_crypt56(p24, lm_resp, partial_lm_hash, 1); des_crypt56(p24+8, lm_resp, partial_lm_hash + 7, 1); memcpy(sess_key, p24, 16); #ifdef DEBUG_PASSWORD DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n")); dump_data(100, sess_key, 16); #endif } DATA_BLOB NTLMv2_generate_names_blob(TALLOC_CTX *mem_ctx, const char *hostname, const char *domain) { DATA_BLOB names_blob = data_blob_talloc(mem_ctx, NULL, 0); msrpc_gen(mem_ctx, &names_blob, "aaa", MsvAvNbDomainName, domain, MsvAvNbComputerName, hostname, MsvAvEOL, ""); return names_blob; } static DATA_BLOB NTLMv2_generate_client_data(TALLOC_CTX *mem_ctx, const DATA_BLOB *names_blob) { uint8_t client_chal[8]; DATA_BLOB response = data_blob(NULL, 0); uint8_t long_date[8]; NTTIME nttime; unix_to_nt_time(&nttime, time(NULL)); generate_random_buffer(client_chal, sizeof(client_chal)); push_nttime(long_date, 0, nttime); /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */ msrpc_gen(mem_ctx, &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(TALLOC_CTX *out_mem_ctx, const uint8_t ntlm_v2_hash[16], const DATA_BLOB *server_chal, const DATA_BLOB *names_blob) { uint8_t ntlmv2_response[16]; DATA_BLOB ntlmv2_client_data; DATA_BLOB final_response; TALLOC_CTX *mem_ctx = talloc_named(out_mem_ctx, 0, "NTLMv2_generate_response internal context"); if (!mem_ctx) { return data_blob(NULL, 0); } /* 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(mem_ctx, 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_talloc(out_mem_ctx, 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); talloc_free(mem_ctx); return final_response; } static DATA_BLOB LMv2_generate_response(TALLOC_CTX *mem_ctx, const uint8_t ntlm_v2_hash[16], const DATA_BLOB *server_chal) { uint8_t lmv2_response[16]; DATA_BLOB lmv2_client_data = data_blob_talloc(mem_ctx, NULL, 8); DATA_BLOB final_response = data_blob_talloc(mem_ctx, 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(TALLOC_CTX *mem_ctx, const char *user, const char *domain, const uint8_t nt_hash[16], const DATA_BLOB *server_chal, const DATA_BLOB *names_blob, DATA_BLOB *lm_response, DATA_BLOB *nt_response, DATA_BLOB *lm_session_key, DATA_BLOB *user_session_key) { uint8_t 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, true, ntlm_v2_hash)) { return false; } if (nt_response) { *nt_response = NTLMv2_generate_response(mem_ctx, ntlm_v2_hash, server_chal, names_blob); if (user_session_key) { *user_session_key = data_blob_talloc(mem_ctx, 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(mem_ctx, ntlm_v2_hash, server_chal); if (lm_session_key) { *lm_session_key = data_blob_talloc(mem_ctx, NULL, 16); /* The NTLMv2 calculations also provide a session key, for signing etc later */ /* use only the first 16 bytes of lm_response for session key */ SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data); } } return true; } bool SMBNTLMv2encrypt(TALLOC_CTX *mem_ctx, 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 *lm_session_key, DATA_BLOB *user_session_key) { uint8_t nt_hash[16]; E_md4hash(password, nt_hash); return SMBNTLMv2encrypt_hash(mem_ctx, user, domain, nt_hash, server_chal, names_blob, lm_response, nt_response, lm_session_key, 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_t buffer[516], const char *password, int string_flags) { uint8_t new_pw[512]; size_t new_pw_len; /* the incoming buffer can be any alignment. */ string_flags |= STR_NOALIGN; new_pw_len = push_string(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_t in_buffer[516], char **pp_new_pwrd, size_t *new_pw_len, charset_t string_charset) { int byte_len=0; *pp_new_pwrd = NULL; *new_pw_len = 0; /* 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. */ if (!convert_string_talloc(ctx, string_charset, CH_UNIX, &in_buffer[512 - byte_len], byte_len, (void *)pp_new_pwrd, new_pw_len, false)) { DEBUG(0, ("decode_pw_buffer: failed to convert incoming password\n")); return false; } #ifdef DEBUG_PASSWORD DEBUG(100,("decode_pw_buffer: new_pwrd: ")); dump_data(100, (uint8_t *)*pp_new_pwrd, *new_pw_len); DEBUG(100,("multibyte len:%lu\n", (unsigned long int)*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. */ arcfour_crypt(pw_buf, key_out, 516); } /*********************************************************** encode a password buffer with an already unicode password. The rest of the buffer is filled with random data to make it harder to attack. ************************************************************/ bool set_pw_in_buffer(uint8_t buffer[516], DATA_BLOB *password) { if (password->length > 512) { return false; } memcpy(&buffer[512 - password->length], password->data, password->length); generate_random_buffer(buffer, 512 - password->length); /* * The length of the new password is in the last 4 bytes of * the data buffer. */ SIVAL(buffer, 512, password->length); return true; } /*********************************************************** decode a password buffer *new_pw_size is the length in bytes of the extracted unicode password ************************************************************/ bool extract_pw_from_buffer(TALLOC_CTX *mem_ctx, uint8_t in_buffer[516], DATA_BLOB *new_pass) { int byte_len=0; /* 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)) { return false; } *new_pass = data_blob_talloc(mem_ctx, &in_buffer[512 - byte_len], byte_len); if (!new_pass->data) { return false; } return true; } /* 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); arcfour_crypt_blob(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; size_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); arcfour_crypt_blob(buffer, 516, &confounded_session_key); if (!decode_pw_buffer(mem_ctx, buffer, pwd, &pwd_len, CH_UTF16)) { data_blob_free(&confounded_session_key); return WERR_BAD_PASSWORD; } data_blob_free(&confounded_session_key); return WERR_OK; }