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samba-mirror/source4/libcli/util/smbencrypt.c
Andrew Tridgell ef2e26c91b first public release of samba4 code
(This used to be commit b0510b5428)
2003-08-13 01:53:07 +00:00

419 lines
12 KiB
C

/*
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;
}