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/*
Unix SMB/Netbios implementation.
Version 1.9.
Password and authentication handling
Copyright (C) Andrew Tridgell 1992-2000
Copyright (C) Luke Kenneth Casson Leighton 1996-2000
Copyright (C) Andrew Bartlett 2001
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"
extern int DEBUGLEVEL;
extern pstring global_myname;
/****************************************************************************
Check user is in correct domain if required
****************************************************************************/
static BOOL check_domain_match(char *user, char *domain)
{
/*
* If we aren't serving to trusted domains, we must make sure that
* the validation request comes from an account in the same domain
* as the Samba server
*/
if (!lp_allow_trusted_domains() &&
!strequal(lp_workgroup(), domain) ) {
DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
return False;
} else {
return True;
}
}
/****************************************************************************
Check a users password, as given in the user-info struct and return various
interesting details in the server_info struct.
This functions does NOT need to be in a become_root()/unbecome_root() pair
as it makes the calls itself when needed.
****************************************************************************/
uint32 check_password(const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info)
{
uint32 nt_status = NT_STATUS_LOGON_FAILURE;
BOOL done_pam = False;
DEBUG(3, ("check_password: Checking password for user %s with the new password interface\n", user_info->smb_username.str));
if (!check_domain_match(user_info->smb_username.str, user_info->domain.str)) {
return NT_STATUS_LOGON_FAILURE;
}
if (nt_status != NT_STATUS_NOPROBLEMO) {
nt_status = check_rhosts_security(user_info, server_info);
}
if ((lp_security() == SEC_DOMAIN) && (nt_status != NT_STATUS_NOPROBLEMO)) {
nt_status = check_domain_security(user_info, server_info);
}
if ((lp_security() == SEC_SERVER) && (nt_status != NT_STATUS_NOPROBLEMO)) {
nt_status = check_server_security(user_info, server_info);
}
if (lp_security() >= SEC_SERVER) {
smb_user_control(user_info->smb_username.str, nt_status);
}
if (nt_status != NT_STATUS_NOPROBLEMO) {
if ((user_info->plaintext_password.len > 0)
&& (!lp_plaintext_to_smbpasswd())) {
nt_status = check_unix_security(user_info, server_info);
done_pam = True;
} else {
nt_status = check_smbpasswd_security(user_info, server_info);
}
}
if ((nt_status == NT_STATUS_NOPROBLEMO) && !done_pam) {
/* We might not be root if we are an RPC call */
become_root();
nt_status = smb_pam_accountcheck(user_info->smb_username.str);
unbecome_root();
}
if (nt_status == NT_STATUS_NOPROBLEMO) {
DEBUG(5, ("check_password: Password for user %s suceeded\n", user_info->smb_username.str));
} else {
DEBUG(3, ("check_password: Password for user %s FAILED with error %s\n", user_info->smb_username.str, get_nt_error_msg(nt_status)));
}
return nt_status;
}
/****************************************************************************
COMPATABILITY INTERFACES:
***************************************************************************/
/****************************************************************************
check if a username/password is OK assuming the password is a 24 byte
SMB hash
return True if the password is correct, False otherwise
****************************************************************************/
uint32 pass_check_smb_with_chal(char *user, char *domain, uchar chal[8],
uchar *lm_pwd, int lm_pwd_len,
uchar *nt_pwd, int nt_pwd_len)
{
auth_usersupplied_info user_info;
auth_serversupplied_info server_info;
AUTH_STR ourdomain, theirdomain, smb_username, wksta_name;
ZERO_STRUCT(user_info);
ZERO_STRUCT(ourdomain);
ZERO_STRUCT(theirdomain);
ZERO_STRUCT(smb_username);
ZERO_STRUCT(wksta_name);
ourdomain.str = lp_workgroup();
ourdomain.len = strlen(ourdomain.str);
theirdomain.str = domain;
theirdomain.len = strlen(theirdomain.str);
user_info.requested_domain = theirdomain;
user_info.domain = ourdomain;
smb_username.str = user;
smb_username.len = strlen(smb_username.str);
user_info.requested_username = smb_username; /* For the time-being */
user_info.smb_username = smb_username;
user_info.wksta_name.str = client_name();
user_info.wksta_name.len = strlen(client_name());
user_info.wksta_name = wksta_name;
memcpy(user_info.chal, chal, 8);
if ((lm_pwd_len >= 24 || nt_pwd_len >= 24) ||
(lp_encrypted_passwords() && (lm_pwd_len == 0) && lp_null_passwords())) {
/* if 24 bytes long assume it is an encrypted password */
user_info.lm_resp.buffer = (uint8 *)lm_pwd;
user_info.lm_resp.len = lm_pwd_len;
user_info.nt_resp.buffer = (uint8 *)nt_pwd;
user_info.nt_resp.len = nt_pwd_len;
} else {
unsigned char local_lm_response[24];
unsigned char local_nt_response[24];
/*
* Not encrypted - do so.
*/
DEBUG(5,("pass_check_smb: User passwords not in encrypted format.\n"));
if (lm_pwd_len > 0) {
SMBencrypt( (uchar *)lm_pwd, user_info.chal, local_lm_response);
user_info.lm_resp.buffer = (uint8 *)local_lm_response;
user_info.lm_resp.len = 24;
/* This encrypts the lm_pwd feild, which actualy contains the password
rather than the nt_pwd field becouse that contains nothing */
SMBNTencrypt((uchar *)lm_pwd, user_info.chal, local_nt_response);
user_info.nt_resp.buffer = (uint8 *)local_nt_response;
user_info.nt_resp.len = 24;
}
user_info.plaintext_password.str = lm_pwd;
user_info.plaintext_password.len = lm_pwd_len;
}
return check_password(&user_info, &server_info);
}
uint32 pass_check_smb(char *user, char *domain,
uchar *lm_pwd, int lm_pwd_len,
uchar *nt_pwd, int nt_pwd_len)
{
uchar chal[8];
if (!last_challenge(chal)) {
generate_random_buffer( chal, 8, False);
}
return pass_check_smb_with_chal(user, domain, chal,
lm_pwd, lm_pwd_len,
nt_pwd, nt_pwd_len);
}
/****************************************************************************
check if a username/password pair is OK either via the system password
database or the encrypted SMB password database
return True if the password is correct, False otherwise
****************************************************************************/
BOOL password_ok(char *user, char *password, int pwlen)
{
/*
* This hack must die! But until I rewrite the rest of samba
* it must stay - abartlet 2001-08-03
*/
if ((pwlen == 0) && !lp_null_passwords()) {
DEBUG(4,("Null passwords not allowed.\n"));
return False;
}
/* The password could be either NTLM or plain LM. Try NTLM first, but fall-through as
required. */
if (pass_check_smb(user, lp_workgroup(), NULL, 0, password, pwlen) == NT_STATUS_NOPROBLEMO) {
return True;
}
if (pass_check_smb(user, lp_workgroup(), password, pwlen, NULL, 0) == NT_STATUS_NOPROBLEMO) {
return True;
}
return False;
}
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