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Move our basic password checking code from inside the authentication

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subsystem into a seperate file - ntlm_check.c.

This allows us to call these routines from ntlm_auth.  The purpose of this
exercise is to allow ntlm_auth (when operating as an NTLMSSP server) to
avoid talking to winbind.  This should allow for easier debugging.

ntlm_auth itself has been reorgainised, so as to share more code between
the SPNEGO-wrapped and 'raw' NTLMSSP modes.  A new 'client' NTLMSSP mode
has been added, for use with a Cyrus-SASL module I am writing (based on vl's
work)

Andrew Bartlett
This commit is contained in:
Andrew Bartlett -
parent 2375abfa00
commit 48315e8fd2
4 changed files with 634 additions and 400 deletions
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3
source/Makefile.in
View File

@ -213,7 +213,8 @@ SECRETS_OBJ = passdb/secrets.o
LIBNMB_OBJ = libsmb/unexpected.o libsmb/namecache.o libsmb/nmblib.o \
libsmb/namequery.o libsmb/conncache.o
LIBSAMBA_OBJ = libsmb/nterr.o libsmb/smbdes.o libsmb/smbencrypt.o libsmb/ntlmssp.o libsmb/ntlmssp_parse.o libsmb/ntlmssp_sign.o
LIBSAMBA_OBJ = libsmb/nterr.o libsmb/smbdes.o libsmb/smbencrypt.o libsmb/ntlm_check.o \
libsmb/ntlmssp.o libsmb/ntlmssp_parse.o libsmb/ntlmssp_sign.o
LIBSMB_OBJ = libsmb/clientgen.o libsmb/cliconnect.o libsmb/clifile.o \
libsmb/clikrb5.o libsmb/clispnego.o libsmb/asn1.o \

346
source/auth/auth_sam.c
View File

@ -3,7 +3,7 @@
Password and authentication handling
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Luke Kenneth Casson Leighton 1996-2000
Copyright (C) Andrew Bartlett 2001
Copyright (C) Andrew Bartlett 2001-2003
Copyright (C) Gerald Carter 2003
This program is free software; you can redistribute it and/or modify
@ -26,350 +26,6 @@
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/****************************************************************************
Core of smb password checking routine.
****************************************************************************/
static BOOL smb_pwd_check_ntlmv1(const DATA_BLOB *nt_response,
const uchar *part_passwd,
const DATA_BLOB *sec_blob,
DATA_BLOB *user_sess_key)
{
/* Finish the encryption of part_passwd. */
uchar p24[24];
if (part_passwd == NULL) {
DEBUG(10,("No password set - DISALLOWING access\n"));
/* No password set - always false ! */
return False;
}
if (sec_blob->length != 8) {
DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n", (unsigned long)sec_blob->length));
return False;
}
if (nt_response->length != 24) {
DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n", (unsigned long)nt_response->length));
return False;
}
SMBOWFencrypt(part_passwd, sec_blob->data, p24);
if (user_sess_key != NULL) {
*user_sess_key = data_blob(NULL, 16);
SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key->data);
}
#if DEBUG_PASSWORD
DEBUG(100,("Part password (P16) was |\n"));
dump_data(100, part_passwd, 16);
DEBUGADD(100,("Password from client was |\n"));
dump_data(100, nt_response->data, nt_response->length);
DEBUGADD(100,("Given challenge was |\n"));
dump_data(100, sec_blob->data, sec_blob->length);
DEBUGADD(100,("Value from encryption was |\n"));
dump_data(100, p24, 24);
#endif
return (memcmp(p24, nt_response->data, 24) == 0);
}
/****************************************************************************
Core of smb password checking routine. (NTLMv2, LMv2)
Note: The same code works with both NTLMv2 and LMv2.
****************************************************************************/
static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB *ntv2_response,
const uchar *part_passwd,
const DATA_BLOB *sec_blob,
const char *user, const char *domain,
DATA_BLOB *user_sess_key)
{
/* Finish the encryption of part_passwd. */
uchar kr[16];
uchar value_from_encryption[16];
uchar client_response[16];
DATA_BLOB client_key_data;
if (part_passwd == NULL) {
DEBUG(10,("No password set - DISALLOWING access\n"));
/* No password set - always False */
return False;
}
if (ntv2_response->length < 24) {
/* We MUST have more than 16 bytes, or the stuff below will go
crazy. No known implementation sends less than the 24 bytes
for LMv2, let alone NTLMv2. */
DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n",
(unsigned long)ntv2_response->length));
return False;
}
client_key_data = data_blob(ntv2_response->data+16, ntv2_response->length-16);
/*
todo: should we be checking this for anything? We can't for LMv2,
but for NTLMv2 it is meant to contain the current time etc.
*/
memcpy(client_response, ntv2_response->data, sizeof(client_response));
if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
return False;
}
SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
if (user_sess_key != NULL) {
*user_sess_key = data_blob(NULL, 16);
SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
}
#if DEBUG_PASSWORD
DEBUG(100,("Part password (P16) was |\n"));
dump_data(100, part_passwd, 16);
DEBUGADD(100,("Password from client was |\n"));
dump_data(100, ntv2_response->data, ntv2_response->length);
DEBUGADD(100,("Variable data from client was |\n"));
dump_data(100, client_key_data.data, client_key_data.length);
DEBUGADD(100,("Given challenge was |\n"));
dump_data(100, sec_blob->data, sec_blob->length);
DEBUGADD(100,("Value from encryption was |\n"));
dump_data(100, value_from_encryption, 16);
#endif
data_blob_clear_free(&client_key_data);
return (memcmp(value_from_encryption, client_response, 16) == 0);
}
/**
* Check a challenge-response password against the value of the NT or
* LM password hash.
*
* @param mem_ctx talloc context
* @param challenge 8-byte challenge. If all zero, forces plaintext comparison
* @param nt_response 'unicode' NT response to the challenge, or unicode password
* @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
* @param username internal Samba username, for log messages
* @param client_username username the client used
* @param client_domain domain name the client used (may be mapped)
* @param nt_pw MD4 unicode password from our passdb or similar
* @param lm_pw LANMAN ASCII password from our passdb or similar
* @param user_sess_key User session key
* @param lm_sess_key LM session key (first 8 bytes of the LM hash)
*/
static NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
const DATA_BLOB *challenge,
const DATA_BLOB *lm_response,
const DATA_BLOB *nt_response,
const char *username,
const char *client_username,
const char *client_domain,
const uint8 *lm_pw, const uint8 *nt_pw,
DATA_BLOB *user_sess_key,
DATA_BLOB *lm_sess_key)
{
static const unsigned char zeros[8];
if (nt_pw == NULL) {
DEBUG(3,("sam_password_ok: NO NT password stored for user %s.\n",
username));
}
/* Check for cleartext netlogon. Used by Exchange 5.5. */
if (challenge->length == sizeof(zeros) &&
(memcmp(challenge->data, zeros, challenge->length) == 0 )) {
DEBUG(4,("sam_password_ok: checking plaintext passwords for user %s\n",
username));
if (nt_pw && nt_response->length) {
unsigned char pwhash[16];
mdfour(pwhash, nt_response->data, nt_response->length);
if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) {
return NT_STATUS_OK;
} else {
DEBUG(3,("sam_password_ok: NT (Unicode) plaintext password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else if (!lp_lanman_auth()) {
DEBUG(3,("sam_password_ok: (plaintext password check) LANMAN passwords NOT PERMITTED for user %s\n",
username));
} else if (lm_pw && lm_response->length) {
uchar dospwd[14];
uchar p16[16];
ZERO_STRUCT(dospwd);
DEBUG(100, ("DOS password: %s\n"));
memcpy(dospwd, lm_response->data, MIN(lm_response->length, sizeof(dospwd)));
/* Only the fisrt 14 chars are considered, password need not be null terminated. */
E_P16((const unsigned char *)dospwd, p16);
dump_data_pw("DOS password (first buffer)\n", dospwd, 14);
dump_data_pw("DOS password (wire DES hash)\n", p16, 16);
dump_data_pw("DOS password (passdb DES hash)\n", lm_pw, 16);
if (memcmp(p16, lm_pw, sizeof(p16)) == 0) {
return NT_STATUS_OK;
} else {
DEBUG(3,("sam_password_ok: LANMAN (ASCII) plaintext password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else {
DEBUG(3, ("Plaintext authentication for user %s attempted, but neither NT nor LM passwords available\n", username));
return NT_STATUS_WRONG_PASSWORD;
}
}
if (nt_response->length != 0 && nt_response->length < 24) {
DEBUG(2,("sam_password_ok: invalid NT password length (%lu) for user %s\n",
(unsigned long)nt_response->length, username));
}
if (nt_response->length >= 24 && nt_pw) {
if (nt_response->length > 24) {
/* We have the NT MD4 hash challenge available - see if we can
use it (ie. does it exist in the smbpasswd file).
*/
DEBUG(4,("sam_password_ok: Checking NTLMv2 password with domain [%s]\n", client_domain));
if (smb_pwd_check_ntlmv2( nt_response,
nt_pw, challenge,
client_username,
client_domain,
user_sess_key)) {
return NT_STATUS_OK;
}
DEBUG(4,("sam_password_ok: Checking NTLMv2 password without a domain\n"));
if (smb_pwd_check_ntlmv2( nt_response,
nt_pw, challenge,
client_username,
"",
user_sess_key)) {
return NT_STATUS_OK;
} else {
DEBUG(3,("sam_password_ok: NTLMv2 password check failed\n"));
return NT_STATUS_WRONG_PASSWORD;
}
}
if (lp_ntlm_auth()) {
/* We have the NT MD4 hash challenge available - see if we can
use it (ie. does it exist in the smbpasswd file).
*/
DEBUG(4,("sam_password_ok: Checking NT MD4 password\n"));
if (smb_pwd_check_ntlmv1(nt_response,
nt_pw, challenge,
user_sess_key)) {
/* The LM session key for this response is not very secure,
so use it only if we otherwise allow LM authentication */
if (lp_lanman_auth() && lm_pw) {
uint8 first_8_lm_hash[16];
memcpy(first_8_lm_hash, lm_pw, 8);
memset(first_8_lm_hash + 8, '\0', 8);
*lm_sess_key = data_blob(first_8_lm_hash, 16);
}
return NT_STATUS_OK;
} else {
DEBUG(3,("sam_password_ok: NT MD4 password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else {
DEBUG(2,("sam_password_ok: NTLMv1 passwords NOT PERMITTED for user %s\n",
username));
/* no return, becouse we might pick up LMv2 in the LM field */
}
}
if (lm_response->length == 0) {
DEBUG(3,("sam_password_ok: NEITHER LanMan nor NT password supplied for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
if (lm_response->length < 24) {
DEBUG(2,("sam_password_ok: invalid LanMan password length (%lu) for user %s\n",
(unsigned long)nt_response->length, username));
return NT_STATUS_WRONG_PASSWORD;
}
if (!lp_lanman_auth()) {
DEBUG(3,("sam_password_ok: Lanman passwords NOT PERMITTED for user %s\n",
username));
} else if (!lm_pw) {
DEBUG(3,("sam_password_ok: NO LanMan password set for user %s (and no NT password supplied)\n",
username));
} else {
DEBUG(4,("sam_password_ok: Checking LM password\n"));
if (smb_pwd_check_ntlmv1(lm_response,
lm_pw, challenge,
NULL)) {
uint8 first_8_lm_hash[16];
memcpy(first_8_lm_hash, lm_pw, 8);
memset(first_8_lm_hash + 8, '\0', 8);
*user_sess_key = data_blob(first_8_lm_hash, 16);
*lm_sess_key = data_blob(first_8_lm_hash, 16);
return NT_STATUS_OK;
}
}
if (!nt_pw) {
DEBUG(4,("sam_password_ok: LM password check failed for user, no NT password %s\n",username));
return NT_STATUS_WRONG_PASSWORD;
}
/* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
- related to Win9X, legacy NAS pass-though authentication
*/
DEBUG(4,("sam_password_ok: Checking LMv2 password with domain %s\n", client_domain));
if (smb_pwd_check_ntlmv2( lm_response,
nt_pw, challenge,
client_username,
client_domain,
NULL)) {
return NT_STATUS_OK;
}
DEBUG(4,("sam_password_ok: Checking LMv2 password without a domain\n"));
if (smb_pwd_check_ntlmv2( lm_response,
nt_pw, challenge,
client_username,
"",
NULL)) {
return NT_STATUS_OK;
}
/* Apparently NT accepts NT responses in the LM field
- I think this is related to Win9X pass-though authentication
*/
DEBUG(4,("sam_password_ok: Checking NT MD4 password in LM field\n"));
if (lp_ntlm_auth()) {
if (smb_pwd_check_ntlmv1(lm_response,
nt_pw, challenge,
NULL)) {
/* The session key for this response is still very odd.
It not very secure, so use it only if we otherwise
allow LM authentication */
if (lp_lanman_auth() && lm_pw) {
uint8 first_8_lm_hash[16];
memcpy(first_8_lm_hash, lm_pw, 8);
memset(first_8_lm_hash + 8, '\0', 8);
*user_sess_key = data_blob(first_8_lm_hash, 16);
*lm_sess_key = data_blob(first_8_lm_hash, 16);
}
return NT_STATUS_OK;
}
DEBUG(3,("sam_password_ok: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
} else {
DEBUG(3,("sam_password_ok: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
}
return NT_STATUS_WRONG_PASSWORD;
}
/****************************************************************************
Do a specific test for an smb password being correct, given a smb_password and
the lanman and NT responses.

377
source/libsmb/ntlm_check.c Normal file
View File

@ -0,0 +1,377 @@
/*
Unix SMB/CIFS implementation.
Password and authentication handling
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Luke Kenneth Casson Leighton 1996-2000
Copyright (C) Andrew Bartlett 2001-2003
Copyright (C) Gerald Carter 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"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/****************************************************************************
Core of smb password checking routine.
****************************************************************************/
static BOOL smb_pwd_check_ntlmv1(const DATA_BLOB *nt_response,
const uchar *part_passwd,
const DATA_BLOB *sec_blob,
DATA_BLOB *user_sess_key)
{
/* Finish the encryption of part_passwd. */
uchar p24[24];
if (part_passwd == NULL) {
DEBUG(10,("No password set - DISALLOWING access\n"));
/* No password set - always false ! */
return False;
}
if (sec_blob->length != 8) {
DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n",
(unsigned long)sec_blob->length));
return False;
}
if (nt_response->length != 24) {
DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n",
(unsigned long)nt_response->length));
return False;
}
SMBOWFencrypt(part_passwd, sec_blob->data, p24);
if (user_sess_key != NULL) {
*user_sess_key = data_blob(NULL, 16);
SMBsesskeygen_ntv1(part_passwd, NULL, user_sess_key->data);
}
#if DEBUG_PASSWORD
DEBUG(100,("Part password (P16) was |\n"));
dump_data(100, part_passwd, 16);
DEBUGADD(100,("Password from client was |\n"));
dump_data(100, nt_response->data, nt_response->length);
DEBUGADD(100,("Given challenge was |\n"));
dump_data(100, sec_blob->data, sec_blob->length);
DEBUGADD(100,("Value from encryption was |\n"));
dump_data(100, p24, 24);
#endif
return (memcmp(p24, nt_response->data, 24) == 0);
}
/****************************************************************************
Core of smb password checking routine. (NTLMv2, LMv2)
Note: The same code works with both NTLMv2 and LMv2.
****************************************************************************/
static BOOL smb_pwd_check_ntlmv2(const DATA_BLOB *ntv2_response,
const uchar *part_passwd,
const DATA_BLOB *sec_blob,
const char *user, const char *domain,
DATA_BLOB *user_sess_key)
{
/* Finish the encryption of part_passwd. */
uchar kr[16];
uchar value_from_encryption[16];
uchar client_response[16];
DATA_BLOB client_key_data;
if (part_passwd == NULL) {
DEBUG(10,("No password set - DISALLOWING access\n"));
/* No password set - always False */
return False;
}
if (sec_blob->length != 8) {
DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect challenge size (%lu)\n",
(unsigned long)sec_blob->length));
return False;
}
if (ntv2_response->length < 24) {
/* We MUST have more than 16 bytes, or the stuff below will go
crazy. No known implementation sends less than the 24 bytes
for LMv2, let alone NTLMv2. */
DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n",
(unsigned long)ntv2_response->length));
return False;
}
client_key_data = data_blob(ntv2_response->data+16, ntv2_response->length-16);
/*
todo: should we be checking this for anything? We can't for LMv2,
but for NTLMv2 it is meant to contain the current time etc.
*/
memcpy(client_response, ntv2_response->data, sizeof(client_response));
if (!ntv2_owf_gen(part_passwd, user, domain, kr)) {
return False;
}
SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
if (user_sess_key != NULL) {
*user_sess_key = data_blob(NULL, 16);
SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
}
#if DEBUG_PASSWORD
DEBUG(100,("Part password (P16) was |\n"));
dump_data(100, part_passwd, 16);
DEBUGADD(100,("Password from client was |\n"));
dump_data(100, ntv2_response->data, ntv2_response->length);
DEBUGADD(100,("Variable data from client was |\n"));
dump_data(100, client_key_data.data, client_key_data.length);
DEBUGADD(100,("Given challenge was |\n"));
dump_data(100, sec_blob->data, sec_blob->length);
DEBUGADD(100,("Value from encryption was |\n"));
dump_data(100, value_from_encryption, 16);
#endif
data_blob_clear_free(&client_key_data);
return (memcmp(value_from_encryption, client_response, 16) == 0);
}
/**
* Check a challenge-response password against the value of the NT or
* LM password hash.
*
* @param mem_ctx talloc context
* @param challenge 8-byte challenge. If all zero, forces plaintext comparison
* @param nt_response 'unicode' NT response to the challenge, or unicode password
* @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
* @param username internal Samba username, for log messages
* @param client_username username the client used
* @param client_domain domain name the client used (may be mapped)
* @param nt_pw MD4 unicode password from our passdb or similar
* @param lm_pw LANMAN ASCII password from our passdb or similar
* @param user_sess_key User session key
* @param lm_sess_key LM session key (first 8 bytes of the LM hash)
*/
NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
const DATA_BLOB *challenge,
const DATA_BLOB *lm_response,
const DATA_BLOB *nt_response,
const char *username,
const char *client_username,
const char *client_domain,
const uint8 *lm_pw, const uint8 *nt_pw,
DATA_BLOB *user_sess_key,
DATA_BLOB *lm_sess_key)
{
static const unsigned char zeros[8];
if (nt_pw == NULL) {
DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
username));
}
/* Check for cleartext netlogon. Used by Exchange 5.5. */
if (challenge->length == sizeof(zeros) &&
(memcmp(challenge->data, zeros, challenge->length) == 0 )) {
DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
username));
if (nt_pw && nt_response->length) {
unsigned char pwhash[16];
mdfour(pwhash, nt_response->data, nt_response->length);
if (memcmp(pwhash, nt_pw, sizeof(pwhash)) == 0) {
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: NT (Unicode) plaintext password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else if (!lp_lanman_auth()) {
DEBUG(3,("ntlm_password_check: (plaintext password check) LANMAN passwords NOT PERMITTED for user %s\n",
username));
} else if (lm_pw && lm_response->length) {
uchar dospwd[14];
uchar p16[16];
ZERO_STRUCT(dospwd);
memcpy(dospwd, lm_response->data, MIN(lm_response->length, sizeof(dospwd)));
/* Only the fisrt 14 chars are considered, password need not be null terminated. */
/* we *might* need to upper-case the string here */
E_P16((const unsigned char *)dospwd, p16);
if (memcmp(p16, lm_pw, sizeof(p16)) == 0) {
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: LANMAN (ASCII) plaintext password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else {
DEBUG(3, ("Plaintext authentication for user %s attempted, but neither NT nor LM passwords available\n", username));
return NT_STATUS_WRONG_PASSWORD;
}
}
if (nt_response->length != 0 && nt_response->length < 24) {
DEBUG(2,("ntlm_password_check: invalid NT password length (%lu) for user %s\n",
(unsigned long)nt_response->length, username));
}
if (nt_response->length >= 24 && nt_pw) {
if (nt_response->length > 24) {
/* We have the NT MD4 hash challenge available - see if we can
use it (ie. does it exist in the smbpasswd file).
*/
DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n", client_domain));
if (smb_pwd_check_ntlmv2( nt_response,
nt_pw, challenge,
client_username,
client_domain,
user_sess_key)) {
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
if (smb_pwd_check_ntlmv2( nt_response,
nt_pw, challenge,
client_username,
"",
user_sess_key)) {
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
return NT_STATUS_WRONG_PASSWORD;
}
}
if (lp_ntlm_auth()) {
/* We have the NT MD4 hash challenge available - see if we can
use it (ie. does it exist in the smbpasswd file).
*/
DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
if (smb_pwd_check_ntlmv1(nt_response,
nt_pw, challenge,
user_sess_key)) {
/* The LM session key for this response is not very secure,
so use it only if we otherwise allow LM authentication */
if (lp_lanman_auth() && lm_pw) {
uint8 first_8_lm_hash[16];
memcpy(first_8_lm_hash, lm_pw, 8);
memset(first_8_lm_hash + 8, '\0', 8);
*lm_sess_key = data_blob(first_8_lm_hash, 16);
}
return NT_STATUS_OK;
} else {
DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
} else {
DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
username));
/* no return, becouse we might pick up LMv2 in the LM field */
}
}
if (lm_response->length == 0) {
DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
username));
return NT_STATUS_WRONG_PASSWORD;
}
if (lm_response->length < 24) {
DEBUG(2,("ntlm_password_check: invalid LanMan password length (%lu) for user %s\n",
(unsigned long)nt_response->length, username));
return NT_STATUS_WRONG_PASSWORD;
}
if (!lp_lanman_auth()) {
DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
username));
} else if (!lm_pw) {
DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
username));
} else {
DEBUG(4,("ntlm_password_check: Checking LM password\n"));
if (smb_pwd_check_ntlmv1(lm_response,
lm_pw, challenge,
NULL)) {
uint8 first_8_lm_hash[16];
memcpy(first_8_lm_hash, lm_pw, 8);
memset(first_8_lm_hash + 8, '\0', 8);
*user_sess_key = data_blob(first_8_lm_hash, 16);
*lm_sess_key = data_blob(first_8_lm_hash, 16);
return NT_STATUS_OK;
}
}
if (!nt_pw) {
DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
return NT_STATUS_WRONG_PASSWORD;
}
/* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
- related to Win9X, legacy NAS pass-though authentication
*/
DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n", client_domain));
if (smb_pwd_check_ntlmv2( lm_response,
nt_pw, challenge,
client_username,
client_domain,
NULL)) {
return NT_STATUS_OK;
}
DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
if (smb_pwd_check_ntlmv2( lm_response,
nt_pw, challenge,
client_username,
"",
NULL)) {
return NT_STATUS_OK;
}
/* Apparently NT accepts NT responses in the LM field
- I think this is related to Win9X pass-though authentication
*/
DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
if (lp_ntlm_auth()) {
if (smb_pwd_check_ntlmv1(lm_response,
nt_pw, challenge,
NULL)) {
/* The session key for this response is still very odd.
It not very secure, so use it only if we otherwise
allow LM authentication */
if (lp_lanman_auth() && lm_pw) {
uint8 first_8_lm_hash[16];
memcpy(first_8_lm_hash, lm_pw, 8);
memset(first_8_lm_hash + 8, '\0', 8);
*user_sess_key = data_blob(first_8_lm_hash, 16);
*lm_sess_key = data_blob(first_8_lm_hash, 16);
}
return NT_STATUS_OK;
}
DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
} else {
DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
}
return NT_STATUS_WRONG_PASSWORD;
}

308
source/utils/ntlm_auth.c
View File

@ -24,6 +24,8 @@
#include "includes.h"
#undef HAVE_KRB5
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND
@ -33,6 +35,7 @@ enum stdio_helper_mode {
SQUID_2_4_BASIC,
SQUID_2_5_BASIC,
SQUID_2_5_NTLMSSP,
CLIENT_NTLMSSP_1,
GSS_SPNEGO,
GSS_SPNEGO_CLIENT,
NUM_HELPER_MODES
@ -55,6 +58,9 @@ static void manage_squid_basic_request (enum stdio_helper_mode stdio_helper_mode
static void manage_squid_ntlmssp_request (enum stdio_helper_mode stdio_helper_mode,
char *buf, int length);
static void manage_client_ntlmssp_request (enum stdio_helper_mode stdio_helper_mode,
char *buf, int length);
static void manage_gss_spnego_request (enum stdio_helper_mode stdio_helper_mode,
char *buf, int length);
@ -69,6 +75,7 @@ static const struct {
{ SQUID_2_4_BASIC, "squid-2.4-basic", manage_squid_basic_request},
{ SQUID_2_5_BASIC, "squid-2.5-basic", manage_squid_basic_request},
{ SQUID_2_5_NTLMSSP, "squid-2.5-ntlmssp", manage_squid_ntlmssp_request},
{ CLIENT_NTLMSSP_1, "client-ntlmssp-1", manage_client_ntlmssp_request},
{ GSS_SPNEGO, "gss-spnego", manage_gss_spnego_request},
{ GSS_SPNEGO_CLIENT, "gss-spnego-client", manage_gss_spnego_client_request},
{ NUM_HELPER_MODES, NULL, NULL}
@ -335,6 +342,112 @@ static NTSTATUS winbind_pw_check(struct ntlmssp_state *ntlmssp_state, DATA_BLOB
return nt_status;
}
static NTSTATUS local_pw_check(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *nt_session_key, DATA_BLOB *lm_session_key)
{
static const char zeros[16];
NTSTATUS nt_status;
uint8 lm_key[8];
uint8 nt_key[16];
uint8 lm_pw[16], nt_pw[16];
nt_lm_owf_gen (opt_password, nt_pw, lm_pw);
nt_status = ntlm_password_check(ntlmssp_state->mem_ctx,
&ntlmssp_state->chal,
&ntlmssp_state->lm_resp,
&ntlmssp_state->nt_resp,
ntlmssp_state->user,
ntlmssp_state->user,
ntlmssp_state->domain,
lm_pw, nt_pw, nt_session_key, lm_session_key);
if (NT_STATUS_IS_OK(nt_status)) {
if (memcmp(lm_key, zeros, 8) != 0) {
*lm_session_key = data_blob(NULL, 16);
memcpy(lm_session_key->data, lm_key, 8);
memset(lm_session_key->data+8, '\0', 8);
}
if (memcmp(nt_key, zeros, 16) != 0) {
*nt_session_key = data_blob(nt_key, 16);
}
} else {
DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
ntlmssp_state->domain, ntlmssp_state->user, ntlmssp_state->workstation,
nt_errstr(nt_status)));
}
return nt_status;
}
static NTSTATUS ntlm_auth_start_ntlmssp_client(NTLMSSP_STATE **client_ntlmssp_state)
{
NTSTATUS status;
if ( (opt_username == NULL) || (opt_domain == NULL) ) {
DEBUG(1, ("Need username and domain for NTLMSSP\n"));
return status;
}
status = ntlmssp_client_start(client_ntlmssp_state);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Could not start NTLMSSP client: %s\n",
nt_errstr(status)));
ntlmssp_end(client_ntlmssp_state);
return status;
}
status = ntlmssp_set_username(*client_ntlmssp_state, opt_username);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Could not set username: %s\n",
nt_errstr(status)));
ntlmssp_end(client_ntlmssp_state);
return status;
}
status = ntlmssp_set_domain(*client_ntlmssp_state, opt_domain);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Could not set domain: %s\n",
nt_errstr(status)));
ntlmssp_end(client_ntlmssp_state);
return status;
}
status = ntlmssp_set_password(*client_ntlmssp_state, opt_password);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Could not set password: %s\n",
nt_errstr(status)));
ntlmssp_end(client_ntlmssp_state);
return status;
}
return NT_STATUS_OK;
}
static NTSTATUS ntlm_auth_start_ntlmssp_server(NTLMSSP_STATE **ntlmssp_state)
{
NTSTATUS status = ntlmssp_server_start(ntlmssp_state);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Could not start NTLMSSP client: %s\n",
nt_errstr(status)));
return status;
}
/* Have we been given a local password, or should we ask winbind? */
if (opt_password) {
(*ntlmssp_state)->check_password = local_pw_check;
(*ntlmssp_state)->get_domain = lp_workgroup;
(*ntlmssp_state)->get_global_myname = global_myname;
} else {
(*ntlmssp_state)->check_password = winbind_pw_check;
(*ntlmssp_state)->get_domain = get_winbind_domain;
(*ntlmssp_state)->get_global_myname = get_winbind_netbios_name;
}
return NT_STATUS_OK;
}
static void manage_squid_ntlmssp_request(enum stdio_helper_mode stdio_helper_mode,
char *buf, int length)
{
@ -348,6 +461,29 @@ static void manage_squid_ntlmssp_request(enum stdio_helper_mode stdio_helper_mod
return;
}
if (strlen(buf) > 3) {
request = base64_decode_data_blob(buf + 3);
} else {
request = data_blob(NULL, 0);
}
if ((strncmp(buf, "PW ", 3) == 0)) {
/* The calling application wants us to use a local password (rather than winbindd) */
opt_password = strndup((const char *)request.data, request.length);
if (opt_password == NULL) {
DEBUG(1, ("Out of memory\n"));
x_fprintf(x_stdout, "BH\n");
data_blob_free(&request);
return;
}
x_fprintf(x_stdout, "OK\n");
data_blob_free(&request);
return;
}
if (strncmp(buf, "YR", 2) == 0) {
if (ntlmssp_state)
ntlmssp_end(&ntlmssp_state);
@ -359,17 +495,11 @@ static void manage_squid_ntlmssp_request(enum stdio_helper_mode stdio_helper_mod
return;
}
if (strlen(buf) > 3) {
request = base64_decode_data_blob(buf + 3);
} else {
request = data_blob(NULL, 0);
}
if (!ntlmssp_state) {
ntlmssp_server_start(&ntlmssp_state);
ntlmssp_state->check_password = winbind_pw_check;
ntlmssp_state->get_domain = get_winbind_domain;
ntlmssp_state->get_global_myname = get_winbind_netbios_name;
if (!NT_STATUS_IS_OK(nt_status = ntlm_auth_start_ntlmssp_server(&ntlmssp_state))) {
x_fprintf(x_stdout, "BH %s\n", nt_errstr(nt_status));
return;
}
}
DEBUG(10, ("got NTLMSSP packet:\n"));
@ -386,6 +516,8 @@ static void manage_squid_ntlmssp_request(enum stdio_helper_mode stdio_helper_mod
} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
x_fprintf(x_stdout, "BH %s\n", nt_errstr(nt_status));
DEBUG(0, ("NTLMSSP BH: %s\n", nt_errstr(nt_status)));
ntlmssp_end(&ntlmssp_state);
} else if (!NT_STATUS_IS_OK(nt_status)) {
x_fprintf(x_stdout, "NA %s\n", nt_errstr(nt_status));
DEBUG(10, ("NTLMSSP %s\n", nt_errstr(nt_status)));
@ -397,6 +529,102 @@ static void manage_squid_ntlmssp_request(enum stdio_helper_mode stdio_helper_mod
data_blob_free(&request);
}
static void manage_client_ntlmssp_request(enum stdio_helper_mode stdio_helper_mode,
char *buf, int length)
{
static NTLMSSP_STATE *ntlmssp_state = NULL;
DATA_BLOB request, reply;
NTSTATUS nt_status;
BOOL first = False;
if (strlen(buf) < 2) {
DEBUG(1, ("NTLMSSP query [%s] invalid", buf));
x_fprintf(x_stdout, "BH\n");
return;
}
if (strlen(buf) > 3) {
request = base64_decode_data_blob(buf + 3);
} else {
request = data_blob(NULL, 0);
}
if (strncmp(buf, "PW ", 3) == 0) {
/* We asked for a password and obviously got it :-) */
opt_password = strndup((const char *)request.data, request.length);
if (opt_password == NULL) {
DEBUG(1, ("Out of memory\n"));
x_fprintf(x_stdout, "BH\n");
data_blob_free(&request);
return;
}
x_fprintf(x_stdout, "OK\n");
data_blob_free(&request);
return;
}
if (opt_password == NULL) {
/* Request a password from the calling process. After
sending it, the calling process should retry asking for the negotiate. */
DEBUG(10, ("Requesting password\n"));
x_fprintf(x_stdout, "PW\n");
return;
}
if (strncmp(buf, "YR", 2) == 0) {
if (ntlmssp_state)
ntlmssp_end(&ntlmssp_state);
} else if (strncmp(buf, "TT", 2) == 0) {
} else {
DEBUG(1, ("NTLMSSP query [%s] invalid", buf));
x_fprintf(x_stdout, "BH\n");
return;
}
if (!ntlmssp_state) {
if (!NT_STATUS_IS_OK(nt_status = ntlm_auth_start_ntlmssp_client(&ntlmssp_state))) {
x_fprintf(x_stdout, "BH %s\n", nt_errstr(nt_status));
return;
}
first = True;
}
DEBUG(10, ("got NTLMSSP packet:\n"));
dump_data(10, (const char *)request.data, request.length);
nt_status = ntlmssp_update(ntlmssp_state, request, &reply);
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
char *reply_base64 = base64_encode_data_blob(reply);
if (first) {
x_fprintf(x_stdout, "YR %s\n", reply_base64);
} else {
x_fprintf(x_stdout, "KK %s\n", reply_base64);
}
SAFE_FREE(reply_base64);
data_blob_free(&reply);
DEBUG(10, ("NTLMSSP challenge\n"));
} else if (NT_STATUS_IS_OK(nt_status)) {
x_fprintf(x_stdout, "AF\n");
DEBUG(10, ("NTLMSSP OK!\n"));
if (ntlmssp_state)
ntlmssp_end(&ntlmssp_state);
} else {
x_fprintf(x_stdout, "BH %s\n", nt_errstr(nt_status));
DEBUG(0, ("NTLMSSP BH: %s\n", nt_errstr(nt_status)));
if (ntlmssp_state)
ntlmssp_end(&ntlmssp_state);
}
data_blob_free(&request);
}
static void manage_squid_basic_request(enum stdio_helper_mode stdio_helper_mode,
char *buf, int length)
{
@ -561,10 +789,10 @@ static void manage_gss_spnego_request(enum stdio_helper_mode stdio_helper_mode,
return;
}
ntlmssp_server_start(&ntlmssp_state);
ntlmssp_state->check_password = winbind_pw_check;
ntlmssp_state->get_domain = get_winbind_domain;
ntlmssp_state->get_global_myname = get_winbind_netbios_name;
if (!NT_STATUS_IS_OK(status = ntlm_auth_start_ntlmssp_server(&ntlmssp_state))) {
x_fprintf(x_stdout, "BH %s\n", nt_errstr(status));
return;
}
DEBUG(10, ("got NTLMSSP packet:\n"));
dump_data(10, (const char *)request.negTokenInit.mechToken.data,
@ -720,11 +948,14 @@ static BOOL manage_client_ntlmssp_init(SPNEGO_DATA spnego)
return False;
}
if ( (opt_username == NULL) || (opt_domain == NULL) ) {
DEBUG(1, ("Need username and domain for NTLMSSP\n"));
return False;
if (!client_ntlmssp_state) {
if (!NT_STATUS_IS_OK(status = ntlm_auth_start_ntlmssp_client(&client_ntlmssp_state))) {
x_fprintf(x_stdout, "BH %s\n", nt_errstr(status));
return False;
}
}
if (opt_password == NULL) {
/* Request a password from the calling process. After
@ -736,42 +967,6 @@ static BOOL manage_client_ntlmssp_init(SPNEGO_DATA spnego)
return True;
}
status = ntlmssp_client_start(&client_ntlmssp_state);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Could not start NTLMSSP client: %s\n",
nt_errstr(status)));
ntlmssp_end(&client_ntlmssp_state);
return False;
}
status = ntlmssp_set_username(client_ntlmssp_state, opt_username);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Could not set username: %s\n",
nt_errstr(status)));
ntlmssp_end(&client_ntlmssp_state);
return False;
}
status = ntlmssp_set_domain(client_ntlmssp_state, opt_domain);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Could not set domain: %s\n",
nt_errstr(status)));
ntlmssp_end(&client_ntlmssp_state);
return False;
}
status = ntlmssp_set_password(client_ntlmssp_state, opt_password);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Could not set password: %s\n",
nt_errstr(status)));
ntlmssp_end(&client_ntlmssp_state);
return False;
}
spnego.type = SPNEGO_NEG_TOKEN_INIT;
spnego.negTokenInit.mechTypes = my_mechs;
spnego.negTokenInit.reqFlags = 0;
@ -1915,7 +2110,12 @@ enum {
exit(0);
}
}
x_fprintf(x_stderr, "unknown helper protocol [%s]\n", helper_protocol);
x_fprintf(x_stderr, "unknown helper protocol [%s]\n\nValid helper protools:\n\n", helper_protocol);
for (i=0; i<NUM_HELPER_MODES; i++) {
x_fprintf(x_stderr, "%s\n", stdio_helper_protocols[i].name);
}
exit(1);
}