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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"
/****************************************************************************
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) || strequal("", 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.
The return value takes precedence over the contents of the server_info
struct. When the return is other than NT_STATUS_NOPROBLEMO the contents
of that structure is undefined.
****************************************************************************/
NTSTATUS check_password(const auth_usersupplied_info *user_info,
const auth_authsupplied_info *auth_info,
auth_serversupplied_info **server_info)
{
NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
const char *pdb_username;
auth_methods *auth_method;
if (!user_info || !auth_info || !server_info) {
return NT_STATUS_LOGON_FAILURE;
}
DEBUG(3, ("check_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
user_info->client_domain.str, user_info->smb_name.str, user_info->wksta_name.str));
DEBUG(3, ("check_password: mapped user is: [%s]\\[%s]@[%s]\n",
user_info->domain.str, user_info->internal_username.str, user_info->wksta_name.str));
DEBUG(10, ("auth_info challange created by %s\n", auth_info->challange_set_by));
DEBUG(10, ("challange is: \n"));
dump_data(5, (auth_info)->challange.data, (auth_info)->challange.length);
#ifdef DEBUG_PASSWORD
DEBUG(100, ("user_info has passwords of length %d and %d\n",
user_info->lm_resp.length, user_info->nt_resp.length));
DEBUG(100, ("lm:\n"));
dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
DEBUG(100, ("nt:\n"));
dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
#endif
for (auth_method = auth_info->auth_method_list;auth_method; auth_method = auth_method->next)
{
nt_status = auth_method->auth(auth_method->private_data, user_info, auth_info, server_info);
if (NT_STATUS_IS_OK(nt_status)) {
DEBUG(3, ("check_password: %s authentication for user [%s] suceeded\n",
auth_method->name, user_info->smb_name.str));
} else {
DEBUG(5, ("check_password: %s authentication for user [%s] FAILED with error %s\n",
auth_method->name, user_info->smb_name.str, get_nt_error_msg(nt_status)));
}
if (NT_STATUS_IS_OK(nt_status)) {
break;
}
}
/* This needs to be sorted: If it doesn't match, what should we do? */
if (!check_domain_match(user_info->smb_name.str, user_info->domain.str)) {
return NT_STATUS_LOGON_FAILURE;
}
/* This is one of the few places the *relies* (rather than just sets defaults
on the value of lp_security(). This needs to change. A new paramater
perhaps? */
if (lp_security() >= SEC_SERVER) {
smb_user_control(user_info, *server_info, nt_status);
}
if (NT_STATUS_IS_OK(nt_status)) {
pdb_username = pdb_get_username((*server_info)->sam_account);
if (!(*server_info)->guest) {
/* We might not be root if we are an RPC call */
become_root();
nt_status = smb_pam_accountcheck(pdb_username);
unbecome_root();
if (NT_STATUS_IS_OK(nt_status)) {
DEBUG(5, ("check_password: PAM Account for user [%s] suceeded\n",
pdb_username));
} else {
DEBUG(3, ("check_password: PAM Account for user [%s] FAILED with error %s\n",
pdb_username, get_nt_error_msg(nt_status)));
}
}
if (NT_STATUS_IS_OK(nt_status)) {
DEBUG((*server_info)->guest ? 5 : 2,
("check_password: %sauthenticaion for user [%s] -> [%s] -> [%s] suceeded\n",
(*server_info)->guest ? "guest " : "",
user_info->smb_name.str,
user_info->internal_username.str,
pdb_username));
}
}
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(2, ("check_password: Authenticaion for user [%s] -> [%s] FAILED with error %s\n",
user_info->smb_name.str, user_info->internal_username.str,
get_nt_error_msg(nt_status)));
ZERO_STRUCTP(server_info);
}
return nt_status;
}
/****************************************************************************
Squash an NT_STATUS return in line with requirements for unauthenticated
connections. (session setups in particular)
****************************************************************************/
NTSTATUS nt_status_squash(NTSTATUS nt_status)
{
if NT_STATUS_IS_OK(nt_status) {
return nt_status;
} else if NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) {
/* Match WinXP and don't give the game away */
return NT_STATUS_LOGON_FAILURE;
} else if NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) {
/* Match WinXP and don't give the game away */
return NT_STATUS_LOGON_FAILURE;
} else {
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
****************************************************************************/
static NTSTATUS pass_check_smb(char *smb_name,
char *domain,
DATA_BLOB lm_pwd,
DATA_BLOB nt_pwd,
DATA_BLOB plaintext_password,
BOOL encrypted)
{
NTSTATUS nt_status;
auth_usersupplied_info *user_info = NULL;
extern auth_authsupplied_info *negprot_global_auth_info;
auth_serversupplied_info *server_info = NULL;
if (encrypted) {
make_user_info_for_reply_enc(&user_info, smb_name,
domain,
lm_pwd,
nt_pwd,
plaintext_password);
nt_status = check_password(user_info, negprot_global_auth_info, &server_info);
} else {
auth_authsupplied_info *plaintext_auth_info = NULL;
DATA_BLOB chal;
if (!make_auth_info_subsystem(&plaintext_auth_info)) {
return NT_STATUS_NO_MEMORY;
}
chal = auth_get_challange(plaintext_auth_info);
if (!make_user_info_for_reply(&user_info,
smb_name, domain, chal.data,
plaintext_password)) {
return NT_STATUS_NO_MEMORY;
}
nt_status = check_password(user_info, plaintext_auth_info, &server_info);
data_blob_free(&chal);
free_auth_info(&plaintext_auth_info);
}
free_user_info(&user_info);
free_server_info(&server_info);
return nt_status;
}
/****************************************************************************
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 *smb_name, DATA_BLOB password_blob)
{
DATA_BLOB null_password = data_blob(NULL, 0);
extern BOOL global_encrypted_passwords_negotiated;
BOOL encrypted = (global_encrypted_passwords_negotiated && password_blob.length == 24);
if (encrypted) {
/*
* The password could be either NTLM or plain LM. Try NTLM first,
* but fall-through as required.
* NTLMv2 makes no sense here.
*/
if (NT_STATUS_IS_OK(pass_check_smb(smb_name, lp_workgroup(), null_password, password_blob, null_password, encrypted))) {
return True;
}
if (NT_STATUS_IS_OK(pass_check_smb(smb_name, lp_workgroup(), password_blob, null_password, null_password, encrypted))) {
return True;
}
} else {
if (NT_STATUS_IS_OK(pass_check_smb(smb_name, lp_workgroup(), null_password, null_password, password_blob, encrypted))) {
return True;
}
}
return False;
}
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