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|
/*
Unix SMB/Netbios implementation.
Version 1.9.
Authentication utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Andrew Bartlett 2001
Copyright (C) Jeremy Allison 2000-2001
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 fstring remote_machine;
extern pstring global_myname;
/****************************************************************************
Create a UNIX user on demand.
****************************************************************************/
static int smb_create_user(const char *unix_user, const char *homedir)
{
pstring add_script;
int ret;
pstrcpy(add_script, lp_adduser_script());
if (! *add_script)
return -1;
all_string_sub(add_script, "%u", unix_user, sizeof(pstring));
if (homedir)
all_string_sub(add_script, "%H", homedir, sizeof(pstring));
ret = smbrun(add_script,NULL);
DEBUG(3,("smb_create_user: Running the command `%s' gave %d\n",add_script,ret));
return ret;
}
/****************************************************************************
Delete a UNIX user on demand.
****************************************************************************/
int smb_delete_user(const char *unix_user)
{
pstring del_script;
int ret;
pstrcpy(del_script, lp_deluser_script());
if (! *del_script)
return -1;
all_string_sub(del_script, "%u", unix_user, sizeof(pstring));
ret = smbrun(del_script,NULL);
DEBUG(3,("smb_delete_user: Running the command `%s' gave %d\n",del_script,ret));
return ret;
}
/****************************************************************************
Add and Delete UNIX users on demand, based on NTSTATUS codes.
****************************************************************************/
void smb_user_control(const auth_usersupplied_info *user_info, auth_serversupplied_info *server_info, NTSTATUS nt_status)
{
struct passwd *pwd=NULL;
if (NT_STATUS_IS_OK(nt_status)) {
if (!(server_info->sam_fill_level & SAM_FILL_UNIX)) {
/*
* User validated ok against Domain controller.
* If the admin wants us to try and create a UNIX
* user on the fly, do so.
*/
if(lp_adduser_script() && !(pwd = Get_Pwnam(user_info->internal_username.str))) {
smb_create_user(user_info->internal_username.str, NULL);
}
}
} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER)) {
/*
* User failed to validate ok against Domain controller.
* If the failure was "user doesn't exist" and admin
* wants us to try and delete that UNIX user on the fly,
* do so.
*/
if (lp_deluser_script()) {
smb_delete_user(user_info->internal_username.str);
}
}
}
/****************************************************************************
Create an auth_usersupplied_data structure
****************************************************************************/
static BOOL make_user_info(auth_usersupplied_info **user_info,
const char *smb_name,
const char *internal_username,
const char *client_domain,
const char *domain,
const char *wksta_name,
DATA_BLOB lm_pwd, DATA_BLOB nt_pwd,
DATA_BLOB plaintext,
uint32 auth_flags, BOOL encrypted)
{
DEBUG(5,("attempting to make a user_info for %s (%s)\n", internal_username, smb_name));
*user_info = malloc(sizeof(**user_info));
if (!user_info) {
DEBUG(0,("malloc failed for user_info (size %d)\n", sizeof(*user_info)));
return False;
}
ZERO_STRUCTP(*user_info);
DEBUG(5,("makeing strings for %s's user_info struct\n", internal_username));
(*user_info)->smb_name.str = strdup(smb_name);
if ((*user_info)->smb_name.str) {
(*user_info)->smb_name.len = strlen(smb_name);
} else {
free_user_info(user_info);
return False;
}
(*user_info)->internal_username.str = strdup(internal_username);
if ((*user_info)->internal_username.str) {
(*user_info)->internal_username.len = strlen(internal_username);
} else {
free_user_info(user_info);
return False;
}
(*user_info)->domain.str = strdup(domain);
if ((*user_info)->domain.str) {
(*user_info)->domain.len = strlen(domain);
} else {
free_user_info(user_info);
return False;
}
(*user_info)->client_domain.str = strdup(client_domain);
if ((*user_info)->client_domain.str) {
(*user_info)->client_domain.len = strlen(client_domain);
} else {
free_user_info(user_info);
return False;
}
(*user_info)->wksta_name.str = strdup(wksta_name);
if ((*user_info)->wksta_name.str) {
(*user_info)->wksta_name.len = strlen(wksta_name);
} else {
free_user_info(user_info);
return False;
}
DEBUG(5,("makeing blobs for %s's user_info struct\n", internal_username));
(*user_info)->lm_resp = data_blob(lm_pwd.data, lm_pwd.length);
(*user_info)->nt_resp = data_blob(nt_pwd.data, nt_pwd.length);
(*user_info)->plaintext_password = data_blob(plaintext.data, plaintext.length);
(*user_info)->encrypted = encrypted;
(*user_info)->auth_flags = auth_flags;
DEBUG(10,("made an %sencrypted user_info for %s (%s)\n", encrypted ? "":"un" , internal_username, smb_name));
return True;
}
/****************************************************************************
Create an auth_usersupplied_data structure after appropriate mapping.
****************************************************************************/
BOOL make_user_info_map(auth_usersupplied_info **user_info,
const char *smb_name,
const char *client_domain,
const char *wksta_name,
DATA_BLOB lm_pwd, DATA_BLOB nt_pwd,
DATA_BLOB plaintext,
uint32 ntlmssp_flags, BOOL encrypted)
{
const char *domain;
fstring internal_username;
fstrcpy(internal_username, smb_name);
map_username(internal_username);
if (lp_allow_trusted_domains()) {
/* the client could have given us a workstation name
or other crap for the workgroup - we really need a
way of telling if this domain name is one of our
trusted domain names
The way I do it here is by checking if the fully
qualified username exists. This is rather reliant
on winbind, but until we have a better method this
will have to do
*/
domain = client_domain;
if ((smb_name) && (*smb_name)) { /* Don't do this for guests */
char *user;
asprintf(&user, "%s%s%s",
client_domain, lp_winbind_separator(),
smb_name);
if (Get_Pwnam(user) == NULL) {
domain = lp_workgroup();
}
free(user);
}
} else {
domain = lp_workgroup();
}
return make_user_info(user_info,
smb_name, internal_username,
client_domain, domain,
wksta_name,
lm_pwd, nt_pwd,
plaintext,
ntlmssp_flags, encrypted);
}
/****************************************************************************
Create an auth_usersupplied_data, making the DATA_BLOBs here.
Decrypt and encrypt the passwords.
****************************************************************************/
BOOL make_user_info_netlogon_network(auth_usersupplied_info **user_info,
char *smb_name,
char *client_domain,
char *wksta_name,
uchar *lm_network_pwd, int lm_pwd_len,
uchar *nt_network_pwd, int nt_pwd_len)
{
BOOL ret;
DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len);
DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len);
DATA_BLOB plaintext_blob = data_blob(NULL, 0);
uint32 auth_flags = AUTH_FLAG_NONE;
if (lm_pwd_len)
auth_flags |= AUTH_FLAG_LM_RESP;
if (nt_pwd_len == 24) {
auth_flags |= AUTH_FLAG_NTLM_RESP;
} else if (nt_pwd_len != 0) {
auth_flags |= AUTH_FLAG_NTLMv2_RESP;
}
ret = make_user_info_map(user_info,
smb_name, client_domain,
wksta_name,
lm_blob, nt_blob,
plaintext_blob,
auth_flags, True);
data_blob_free(&lm_blob);
data_blob_free(&nt_blob);
return ret;
}
/****************************************************************************
Create an auth_usersupplied_data, making the DATA_BLOBs here.
Decrypt and encrypt the passwords.
****************************************************************************/
BOOL make_user_info_netlogon_interactive(auth_usersupplied_info **user_info,
const char *smb_name,
const char *client_domain,
const char *wksta_name,
const uchar chal[8],
const uchar lm_interactive_pwd[16],
const uchar nt_interactive_pwd[16],
const uchar *dc_sess_key)
{
char lm_pwd[16];
char nt_pwd[16];
unsigned char local_lm_response[24];
unsigned char local_nt_response[24];
unsigned char key[16];
uint32 auth_flags = AUTH_FLAG_NONE;
ZERO_STRUCT(key);
memcpy(key, dc_sess_key, 8);
if (lm_interactive_pwd) memcpy(lm_pwd, lm_interactive_pwd, sizeof(lm_pwd));
if (nt_interactive_pwd) memcpy(nt_pwd, nt_interactive_pwd, sizeof(nt_pwd));
#ifdef DEBUG_PASSWORD
DEBUG(100,("key:"));
dump_data(100, (char *)key, sizeof(key));
DEBUG(100,("lm owf password:"));
dump_data(100, lm_pwd, sizeof(lm_pwd));
DEBUG(100,("nt owf password:"));
dump_data(100, nt_pwd, sizeof(nt_pwd));
#endif
SamOEMhash((uchar *)lm_pwd, key, sizeof(lm_pwd));
SamOEMhash((uchar *)nt_pwd, key, sizeof(nt_pwd));
#ifdef DEBUG_PASSWORD
DEBUG(100,("decrypt of lm owf password:"));
dump_data(100, lm_pwd, sizeof(lm_pwd));
DEBUG(100,("decrypt of nt owf password:"));
dump_data(100, nt_pwd, sizeof(nt_pwd));
#endif
SMBOWFencrypt((const unsigned char *)lm_pwd, chal, local_lm_response);
SMBOWFencrypt((const unsigned char *)nt_pwd, chal, local_nt_response);
/* Password info parinoia */
ZERO_STRUCT(lm_pwd);
ZERO_STRUCT(nt_pwd);
ZERO_STRUCT(key);
{
BOOL ret;
DATA_BLOB local_lm_blob = data_blob(local_lm_response, sizeof(local_lm_response));
DATA_BLOB local_nt_blob = data_blob(local_nt_response, sizeof(local_nt_response));
DATA_BLOB plaintext_blob = data_blob(NULL, 0);
if (lm_interactive_pwd)
auth_flags |= AUTH_FLAG_LM_RESP;
if (nt_interactive_pwd)
auth_flags |= AUTH_FLAG_NTLM_RESP;
ret = make_user_info_map(user_info,
smb_name, client_domain,
wksta_name,
local_lm_blob,
local_nt_blob,
plaintext_blob,
auth_flags, True);
data_blob_free(&local_lm_blob);
data_blob_free(&local_nt_blob);
return ret;
}
}
/****************************************************************************
Create an auth_usersupplied_data structure
****************************************************************************/
BOOL make_user_info_for_reply(auth_usersupplied_info **user_info,
char *smb_name,
char *client_domain,
const uint8 chal[8],
DATA_BLOB plaintext_password)
{
DATA_BLOB local_lm_blob;
DATA_BLOB local_nt_blob;
BOOL ret = False;
uint32 auth_flags = AUTH_FLAG_NONE;
/*
* Not encrypted - do so.
*/
DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted format.\n"));
if (plaintext_password.data) {
unsigned char local_lm_response[24];
#ifdef DEBUG_PASSWORD
DEBUG(10,("Unencrypted password (len %d):\n",plaintext_password.length));
dump_data(100, plaintext_password.data, plaintext_password.length);
#endif
SMBencrypt( (const uchar *)plaintext_password.data, (const uchar*)chal, local_lm_response);
local_lm_blob = data_blob(local_lm_response, 24);
/* We can't do an NT hash here, as the password needs to be
case insensitive */
local_nt_blob = data_blob(NULL, 0);
auth_flags = (AUTH_FLAG_PLAINTEXT | AUTH_FLAG_LM_RESP);
} else {
local_lm_blob = data_blob(NULL, 0);
local_nt_blob = data_blob(NULL, 0);
}
ret = make_user_info_map(user_info, smb_name,
client_domain,
remote_machine,
local_lm_blob,
local_nt_blob,
plaintext_password,
auth_flags, False);
data_blob_free(&local_lm_blob);
return ret;
}
/****************************************************************************
Create an auth_usersupplied_data structure
****************************************************************************/
BOOL make_user_info_for_reply_enc(auth_usersupplied_info **user_info,
char *smb_name,
char *client_domain,
DATA_BLOB lm_resp, DATA_BLOB nt_resp)
{
uint32 auth_flags = AUTH_FLAG_NONE;
DATA_BLOB no_plaintext_blob = data_blob(NULL, 0);
if (lm_resp.length == 24) {
auth_flags |= AUTH_FLAG_LM_RESP;
}
if (nt_resp.length == 0) {
} else if (nt_resp.length == 24) {
auth_flags |= AUTH_FLAG_NTLM_RESP;
} else {
auth_flags |= AUTH_FLAG_NTLMv2_RESP;
}
return make_user_info_map(user_info, smb_name,
client_domain,
remote_machine,
lm_resp,
nt_resp,
no_plaintext_blob,
auth_flags, True);
}
/****************************************************************************
Create a guest user_info blob, for anonymous authenticaion.
****************************************************************************/
BOOL make_user_info_guest(auth_usersupplied_info **user_info)
{
DATA_BLOB lm_blob = data_blob(NULL, 0);
DATA_BLOB nt_blob = data_blob(NULL, 0);
DATA_BLOB plaintext_blob = data_blob(NULL, 0);
uint32 auth_flags = AUTH_FLAG_NONE;
return make_user_info(user_info,
"","",
"","",
"",
nt_blob, lm_blob,
plaintext_blob,
auth_flags, True);
}
/***************************************************************************
Make a user_info struct
***************************************************************************/
BOOL make_server_info(auth_serversupplied_info **server_info)
{
*server_info = malloc(sizeof(**server_info));
if (!*server_info) {
DEBUG(0,("make_server_info: malloc failed!\n"));
return False;
}
ZERO_STRUCTP(*server_info);
return True;
}
/***************************************************************************
Make (and fill) a user_info struct from a SAM_ACCOUNT
***************************************************************************/
BOOL make_server_info_sam(auth_serversupplied_info **server_info, SAM_ACCOUNT *sampass)
{
if (!make_server_info(server_info)) {
return False;
}
(*server_info)->sam_fill_level = SAM_FILL_ALL;
(*server_info)->sam_account = sampass;
DEBUG(5,("make_server_info_sam: made server info for user %s\n",
pdb_get_username((*server_info)->sam_account)));
return True;
}
/***************************************************************************
Make (and fill) a user_info struct from a 'struct passwd' by conversion
to a SAM_ACCOUNT
***************************************************************************/
BOOL make_server_info_pw(auth_serversupplied_info **server_info, const struct passwd *pwd)
{
SAM_ACCOUNT *sampass = NULL;
if (!NT_STATUS_IS_OK(pdb_init_sam_pw(&sampass, pwd))) {
return False;
}
return make_server_info_sam(server_info, sampass);
}
/***************************************************************************
Free a user_info struct
***************************************************************************/
void free_user_info(auth_usersupplied_info **user_info)
{
DEBUG(5,("attempting to free (and zero) a user_info structure\n"));
if (*user_info != NULL) {
if ((*user_info)->smb_name.str) {
DEBUG(10,("structure was created for %s\n", (*user_info)->smb_name.str));
}
SAFE_FREE((*user_info)->smb_name.str);
SAFE_FREE((*user_info)->internal_username.str);
SAFE_FREE((*user_info)->client_domain.str);
SAFE_FREE((*user_info)->domain.str);
SAFE_FREE((*user_info)->wksta_name.str);
data_blob_free(&(*user_info)->lm_resp);
data_blob_free(&(*user_info)->nt_resp);
SAFE_FREE((*user_info)->interactive_password);
data_blob_clear_free(&(*user_info)->plaintext_password);
ZERO_STRUCT(**user_info);
}
SAFE_FREE(*user_info);
}
/***************************************************************************
Clear out a server_info struct that has been allocated
***************************************************************************/
void free_server_info(auth_serversupplied_info **server_info)
{
if (*server_info != NULL) {
pdb_free_sam(&(*server_info)->sam_account);
/* call pam_end here, unless we know we are keeping it */
delete_nt_token( &(*server_info)->ptok );
ZERO_STRUCT(**server_info);
}
SAFE_FREE(*server_info);
}
/***************************************************************************
Make a server_info struct for a guest user
***************************************************************************/
BOOL make_server_info_guest(auth_serversupplied_info **server_info)
{
struct passwd *pass = getpwnam_alloc(lp_guestaccount());
if (pass) {
if (!make_server_info_pw(server_info, pass)) {
passwd_free(&pass);
return False;
}
(*server_info)->guest = True;
passwd_free(&pass);
return True;
}
DEBUG(0,("make_server_info_guest: getpwnam_alloc() failed on guest account!\n"));
return False;
}
/***************************************************************************
Make an auth_methods struct
***************************************************************************/
BOOL make_auth_methods(struct auth_context *auth_context, auth_methods **auth_method)
{
if (!auth_context) {
smb_panic("no auth_context supplied to make_auth_methods()!\n");
}
if (!auth_method) {
smb_panic("make_auth_methods: pointer to auth_method pointer is NULL!\n");
}
*auth_method = talloc(auth_context->mem_ctx, sizeof(**auth_method));
if (!*auth_method) {
DEBUG(0,("make_auth_method: malloc failed!\n"));
return False;
}
ZERO_STRUCTP(*auth_method);
return True;
}
/****************************************************************************
Delete a SID token.
****************************************************************************/
void delete_nt_token(NT_USER_TOKEN **pptoken)
{
if (*pptoken) {
NT_USER_TOKEN *ptoken = *pptoken;
SAFE_FREE( ptoken->user_sids );
ZERO_STRUCTP(ptoken);
}
SAFE_FREE(*pptoken);
}
/****************************************************************************
Duplicate a SID token.
****************************************************************************/
NT_USER_TOKEN *dup_nt_token(NT_USER_TOKEN *ptoken)
{
NT_USER_TOKEN *token;
if (!ptoken)
return NULL;
if ((token = (NT_USER_TOKEN *)malloc( sizeof(NT_USER_TOKEN) ) ) == NULL)
return NULL;
ZERO_STRUCTP(token);
if ((token->user_sids = (DOM_SID *)memdup( ptoken->user_sids, sizeof(DOM_SID) * ptoken->num_sids )) == NULL) {
SAFE_FREE(token);
return NULL;
}
token->num_sids = ptoken->num_sids;
return token;
}
/**
* Squash an NT_STATUS in line with security requirements.
* In an attempt to avoid giving the whole game away when users
* are authenticating, NT replaces both NT_STATUS_NO_SUCH_USER and
* NT_STATUS_WRONG_PASSWORD with NT_STATUS_LOGON_FAILURE in certain situations
* (session setups in particular).
*
* @param nt_status NTSTATUS input for squashing.
* @return the 'squashed' nt_status
**/
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;
}
}
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