/*
Unix SMB/CIFS implementation.
SMB client password change routine
Copyright (C) Andrew Tridgell 1994-1998
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 3 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, see .
*/
#include "includes.h"
#include "../librpc/gen_ndr/ndr_samr.h"
#include "rpc_client/cli_pipe.h"
#include "rpc_client/cli_samr.h"
#include "libsmb/libsmb.h"
#include "libsmb/clirap.h"
#include "libsmb/nmblib.h"
#include "../libcli/smb/smbXcli_base.h"
/*************************************************************
Change a password on a remote machine using IPC calls.
*************************************************************/
NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
const char *old_passwd, const char *new_passwd,
char **err_str)
{
struct cli_state *cli = NULL;
struct rpc_pipe_client *pipe_hnd = NULL;
char *user, *domain, *p;
NTSTATUS result;
bool pass_must_change = False;
user = talloc_strdup(talloc_tos(), user_name);
SMB_ASSERT(user != NULL);
domain = talloc_strdup(talloc_tos(), "");
SMB_ASSERT(domain != NULL);
/* allow usernames of the form domain\\user or domain/user */
if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
(p = strchr_m(user,*lp_winbind_separator()))) {
*p = 0;
domain = user;
user = p+1;
}
*err_str = NULL;
result = cli_connect_nb(remote_machine, NULL, 0, 0x20, NULL,
SMB_SIGNING_DEFAULT, 0, &cli);
if (!NT_STATUS_IS_OK(result)) {
if (asprintf(err_str, "Unable to connect to SMB server on "
"machine %s. Error was : %s.\n",
remote_machine, nt_errstr(result))==-1) {
*err_str = NULL;
}
return result;
}
result = smbXcli_negprot(cli->conn, cli->timeout, PROTOCOL_CORE,
PROTOCOL_NT1);
if (!NT_STATUS_IS_OK(result)) {
if (asprintf(err_str, "machine %s rejected the negotiate "
"protocol. Error was : %s.\n",
remote_machine, nt_errstr(result)) == -1) {
*err_str = NULL;
}
cli_shutdown(cli);
return result;
}
/* Given things like SMB signing, restrict anonymous and the like,
try an authenticated connection first */
result = cli_session_setup(cli, user_name,
old_passwd, strlen(old_passwd)+1,
old_passwd, strlen(old_passwd)+1, "");
if (!NT_STATUS_IS_OK(result)) {
/* Password must change or Password expired are the only valid
* error conditions here from where we can proceed, the rest like
* account locked out or logon failure will lead to errors later
* anyway */
if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
if (asprintf(err_str, "Could not connect to machine %s: "
"%s\n", remote_machine, nt_errstr(result)) == -1) {
*err_str = NULL;
}
cli_shutdown(cli);
return result;
}
pass_must_change = True;
/*
* We should connect as the anonymous user here, in case
* the server has "must change password" checked...
* Thanks to for this fix.
*/
result = cli_session_setup(cli, "", "", 0, "", 0, "");
if (!NT_STATUS_IS_OK(result)) {
if (asprintf(err_str, "machine %s rejected the session "
"setup. Error was : %s.\n",
remote_machine, nt_errstr(result)) == -1) {
*err_str = NULL;
}
cli_shutdown(cli);
return result;
}
result = cli_init_creds(cli, "", "", NULL);
if (!NT_STATUS_IS_OK(result)) {
cli_shutdown(cli);
return result;
}
} else {
result = cli_init_creds(cli, user, domain, old_passwd);
if (!NT_STATUS_IS_OK(result)) {
cli_shutdown(cli);
return result;
}
}
result = cli_tree_connect(cli, "IPC$", "IPC", "", 1);
if (!NT_STATUS_IS_OK(result)) {
if (asprintf(err_str, "machine %s rejected the tconX on the "
"IPC$ share. Error was : %s.\n",
remote_machine, nt_errstr(result))) {
*err_str = NULL;
}
cli_shutdown(cli);
return result;
}
/* Try not to give the password away too easily */
if (!pass_must_change) {
result = cli_rpc_pipe_open_generic_auth(cli,
&ndr_table_samr,
NCACN_NP,
DCERPC_AUTH_TYPE_NTLMSSP,
DCERPC_AUTH_LEVEL_PRIVACY,
remote_machine,
domain, user,
old_passwd,
&pipe_hnd);
} else {
/*
* If the user password must be changed the ntlmssp bind will
* fail the same way as the session setup above did. The
* difference ist that with a pipe bind we don't get a good
* error message, the result will be that the rpc call below
* will just fail. So we do it anonymously, there's no other
* way.
*/
result = cli_rpc_pipe_open_noauth(
cli, &ndr_table_samr, &pipe_hnd);
}
if (!NT_STATUS_IS_OK(result)) {
if (lp_client_lanman_auth()) {
/* Use the old RAP method. */
if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
result = cli_nt_error(cli);
if (asprintf(err_str, "machine %s rejected the "
"password change: Error was : %s.\n",
remote_machine, nt_errstr(result)) == -1) {
*err_str = NULL;
}
cli_shutdown(cli);
return result;
}
} else {
if (asprintf(err_str, "SAMR connection to machine %s "
"failed. Error was %s, but LANMAN password "
"changes are disabled\n",
remote_machine, nt_errstr(result)) == -1) {
*err_str = NULL;
}
cli_shutdown(cli);
return result;
}
}
result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
user_name, new_passwd, old_passwd);
if (NT_STATUS_IS_OK(result)) {
/* Great - it all worked! */
cli_shutdown(cli);
return NT_STATUS_OK;
} else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
|| NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
/* it failed, but for reasons such as wrong password, too short etc ... */
if (asprintf(err_str, "machine %s rejected the password change: "
"Error was : %s.\n",
remote_machine, get_friendly_nt_error_msg(result)) == -1) {
*err_str = NULL;
}
cli_shutdown(cli);
return result;
}
/* OK, that failed, so try again... */
TALLOC_FREE(pipe_hnd);
/* Try anonymous NTLMSSP... */
result = cli_init_creds(cli, "", "", NULL);
if (!NT_STATUS_IS_OK(result)) {
cli_shutdown(cli);
return result;
}
result = NT_STATUS_UNSUCCESSFUL;
/* OK, this is ugly, but... try an anonymous pipe. */
result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr,
&pipe_hnd);
if ( NT_STATUS_IS_OK(result) &&
(NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
pipe_hnd, talloc_tos(), user_name,
new_passwd, old_passwd)))) {
/* Great - it all worked! */
cli_shutdown(cli);
return NT_STATUS_OK;
} else {
if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
|| NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
/* it failed, but again it was due to things like new password too short */
if (asprintf(err_str, "machine %s rejected the "
"(anonymous) password change: Error was : "
"%s.\n", remote_machine,
get_friendly_nt_error_msg(result)) == -1) {
*err_str = NULL;
}
cli_shutdown(cli);
return result;
}
/* We have failed to change the user's password, and we think the server
just might not support SAMR password changes, so fall back */
if (lp_client_lanman_auth()) {
/* Use the old RAP method. */
if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
/* SAMR failed, but the old LanMan protocol worked! */
cli_shutdown(cli);
return NT_STATUS_OK;
}
result = cli_nt_error(cli);
if (asprintf(err_str, "machine %s rejected the password "
"change: Error was : %s.\n",
remote_machine, nt_errstr(result)) == -1) {
*err_str = NULL;
}
cli_shutdown(cli);
return result;
} else {
if (asprintf(err_str, "SAMR connection to machine %s "
"failed. Error was %s, but LANMAN password "
"changes are disabled\n",
nt_errstr(result), remote_machine) == -1) {
*err_str = NULL;
}
cli_shutdown(cli);
return NT_STATUS_UNSUCCESSFUL;
}
}
}