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Diffstat (limited to 'source/libsmb/smbencrypt.c')
| -rw-r--r-- | source/libsmb/smbencrypt.c | 526 |
1 files changed, 526 insertions, 0 deletions
diff --git a/source/libsmb/smbencrypt.c b/source/libsmb/smbencrypt.c new file mode 100644 index 00000000000..c5acedae51c --- /dev/null +++ b/source/libsmb/smbencrypt.c @@ -0,0 +1,526 @@ +/* + 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 + * @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, 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 +} + +/* 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_lmv1(const uchar lm_hash[16], + const uchar lm_resp[24], /* only uses 8 */ + uint8 sess_key[16]) +{ + /* Calculate the LM session key (effective length 40 bits, + but changes with each session) */ + + uchar p24[24]; + uchar partial_lm_hash[16]; + + memcpy(partial_lm_hash, lm_hash, 8); + memset(partial_lm_hash + 8, 0xbd, 8); + + SMBOWFencrypt(lm_hash, lm_resp, p24); + + memcpy(sess_key, p24, 16); + sess_key[5] = 0xe5; + sess_key[6] = 0x38; + sess_key[7] = 0xb0; + +#ifdef DEBUG_PASSWORD + DEBUG(100, ("SMBsesskeygen_lmv1:\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, 0); + + 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, 0); + char long_date[8]; + + generate_random_buffer(client_chal, sizeof(client_chal), False); + + 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, False); + + /* 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(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 *nt_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; + } + + if (nt_response) { + *nt_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal, + names_blob); + if (nt_session_key) { + *nt_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, nt_session_key->data); + } + } + + /* LMv2 */ + + if (lm_response) { + *lm_response = LMv2_generate_response(ntlm_v2_hash, server_chal); + } + + return True; +} + +/*********************************************************** + 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(char buffer[516], const char *password, int string_flags) +{ + uchar new_pw[512]; + size_t new_pw_len; + + 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((unsigned char *)buffer, 512 - new_pw_len, True); + + /* + * 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(char in_buffer[516], char *new_pwrd, + int new_pwrd_size, uint32 *new_pw_len, + int string_flags) +{ + int byte_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. Buffer length supplied */ + *new_pw_len = pull_string(NULL, new_pwrd, &in_buffer[512 - byte_len], new_pwrd_size, + byte_len, string_flags); + +#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; +} |