/* 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 <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "rpc_client/cli_samr.h" #include "../librpc/gen_ndr/ndr_samr.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 nmb_name calling, called; struct cli_state *cli = NULL; struct rpc_pipe_client *pipe_hnd = NULL; struct sockaddr_storage ss; 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; if(!resolve_name( remote_machine, &ss, 0x20, false)) { if (asprintf(err_str, "Unable to find an IP address for machine " "%s.\n", remote_machine) == -1) { *err_str = NULL; } return NT_STATUS_UNSUCCESSFUL; } cli = cli_initialise(); if (!cli) { return NT_STATUS_NO_MEMORY; } result = cli_connect(cli, remote_machine, &ss); 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; } cli_shutdown(cli); return result; } make_nmb_name(&calling, global_myname() , 0x0); make_nmb_name(&called , remote_machine, 0x20); if (!cli_session_request(cli, &calling, &called)) { if (asprintf(err_str, "machine %s rejected the session setup. " "Error was : %s.\n", remote_machine, cli_errstr(cli)) == -1) { *err_str = NULL; } result = cli_nt_error(cli); cli_shutdown(cli); return result; } cli->protocol = PROTOCOL_NT1; result = cli_negprot(cli); 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; } result = cli_nt_error(cli); 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, cli_errstr(cli)) == -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 <Nicholas.S.Jenkins@cdc.com> 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, cli_errstr(cli)) == -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_tcon_andx(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_ntlmssp(cli, &ndr_table_samr.syntax_id, NCACN_NP, DCERPC_AUTH_LEVEL_PRIVACY, 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.syntax_id, &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)) { if (asprintf(err_str, "machine %s rejected the " "password change: Error was : %s.\n", remote_machine, cli_errstr(cli)) == -1) { *err_str = NULL; } result = cli_nt_error(cli); 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; } result = cli_nt_error(cli); 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.syntax_id, &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; } if (asprintf(err_str, "machine %s rejected the password " "change: Error was : %s.\n", remote_machine, cli_errstr(cli)) == -1) { *err_str = NULL; } result = cli_nt_error(cli); 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; } } }