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/*
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 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"
/*************************************************************
Change a password on a remote machine using IPC calls.
*************************************************************/
BOOL remote_password_change(const char *remote_machine, const char *user_name,
const char *old_passwd, const char *new_passwd,
char *err_str, size_t err_str_len)
{
struct nmb_name calling, called;
struct cli_state cli;
struct rpc_pipe_client *pipe_hnd;
struct in_addr ip;
NTSTATUS result;
BOOL pass_must_change = False;
*err_str = '\0';
if(!resolve_name( remote_machine, &ip, 0x20)) {
slprintf(err_str, err_str_len-1, "unable to find an IP address for machine %s.\n",
remote_machine );
return False;
}
ZERO_STRUCT(cli);
if (!cli_initialise(&cli) || !cli_connect(&cli, remote_machine, &ip)) {
slprintf(err_str, err_str_len-1, "unable to connect to SMB server on machine %s. Error was : %s.\n",
remote_machine, cli_errstr(&cli) );
return False;
}
make_nmb_name(&calling, global_myname() , 0x0);
make_nmb_name(&called , remote_machine, 0x20);
if (!cli_session_request(&cli, &calling, &called)) {
slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
remote_machine, cli_errstr(&cli) );
cli_shutdown(&cli);
return False;
}
cli.protocol = PROTOCOL_NT1;
if (!cli_negprot(&cli)) {
slprintf(err_str, err_str_len-1, "machine %s rejected the negotiate protocol. Error was : %s.\n",
remote_machine, cli_errstr(&cli) );
cli_shutdown(&cli);
return False;
}
/* Given things like SMB signing, restrict anonymous and the like,
try an authenticated connection first */
if (!cli_session_setup(&cli, user_name, old_passwd, strlen(old_passwd)+1, old_passwd, strlen(old_passwd)+1, "")) {
result = cli_nt_error(&cli);
if (!NT_STATUS_IS_OK(result)) {
/* Password must change is the only valid error
* condition 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)) {
slprintf(err_str, err_str_len-1, "Could not "
"connect to machine %s: %s\n",
remote_machine, cli_errstr(&cli));
cli_shutdown(&cli);
return False;
}
pass_must_change = True;
}
/*
* We should connect as the anonymous user here, in case
* the server has "must change password" checked...
* Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
*/
if (!cli_session_setup(&cli, "", "", 0, "", 0, "")) {
slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
remote_machine, cli_errstr(&cli) );
cli_shutdown(&cli);
return False;
}
cli_init_creds(&cli, "", "", NULL);
} else {
cli_init_creds(&cli, user_name, "", old_passwd);
}
if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
slprintf(err_str, err_str_len-1, "machine %s rejected the tconX on the IPC$ share. Error was : %s.\n",
remote_machine, cli_errstr(&cli) );
cli_shutdown(&cli);
return False;
}
/* Try not to give the password away too easily */
if (!pass_must_change) {
pipe_hnd = cli_rpc_pipe_open_ntlmssp(&cli,
PI_SAMR,
PIPE_AUTH_LEVEL_PRIVACY,
"", /* what domain... ? */
user_name,
old_passwd,
&result);
} 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.
*/
pipe_hnd = cli_rpc_pipe_open_noauth(&cli, PI_SAMR, &result);
}
if (!pipe_hnd) {
if (lp_client_lanman_auth()) {
/* Use the old RAP method. */
if (!cli_oem_change_password(&cli, user_name, new_passwd, old_passwd)) {
slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
remote_machine, cli_errstr(&cli) );
cli_shutdown(&cli);
return False;
}
} else {
slprintf(err_str, err_str_len-1,
"SAMR connection to machine %s failed. Error was %s, "
"but LANMAN password changed are disabled\n",
nt_errstr(result), remote_machine);
cli_shutdown(&cli);
return False;
}
}
if (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd, cli.mem_ctx, user_name,
new_passwd, old_passwd))) {
/* Great - it all worked! */
cli_shutdown(&cli);
return True;
} 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 ... */
slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
remote_machine, get_friendly_nt_error_msg(result));
cli_shutdown(&cli);
return False;
}
/* OK, that failed, so try again... */
cli_rpc_pipe_close(pipe_hnd);
/* Try anonymous NTLMSSP... */
cli_init_creds(&cli, "", "", NULL);
result = NT_STATUS_UNSUCCESSFUL;
/* OK, this is ugly, but... try an anonymous pipe. */
pipe_hnd = cli_rpc_pipe_open_noauth(&cli, PI_SAMR, &result);
if ( pipe_hnd &&
(NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd,
cli.mem_ctx,
user_name,
new_passwd,
old_passwd)))) {
/* Great - it all worked! */
cli_shutdown(&cli);
return True;
} 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 */
slprintf(err_str, err_str_len-1,
"machine %s rejected the (anonymous) password change: Error was : %s.\n",
remote_machine, get_friendly_nt_error_msg(result));
cli_shutdown(&cli);
return False;
}
/* 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 True;
}
slprintf(err_str, err_str_len-1,
"machine %s rejected the password change: Error was : %s.\n",
remote_machine, cli_errstr(&cli) );
cli_shutdown(&cli);
return False;
} else {
slprintf(err_str, err_str_len-1,
"SAMR connection to machine %s failed. Error was %s, "
"but LANMAN password changed are disabled\n",
nt_errstr(result), remote_machine);
cli_shutdown(&cli);
return False;
}
}
}
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