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-rw-r--r--source3/libsmb/passchange.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/source3/libsmb/passchange.c b/source3/libsmb/passchange.c
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+++ b/source3/libsmb/passchange.c
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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 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"
+
+/*************************************************************
+ 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;
+ struct rpc_pipe_client *pipe_hnd;
+ struct sockaddr_storage ss;
+
+ NTSTATUS result;
+ bool pass_must_change = False;
+
+ *err_str = NULL;
+
+ if(!resolve_name( remote_machine, &ss, 0x20)) {
+ asprintf(err_str, "Unable to find an IP address for machine "
+ "%s.\n", remote_machine);
+ 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)) {
+ asprintf(err_str, "Unable to connect to SMB server on "
+ "machine %s. Error was : %s.\n",
+ remote_machine, nt_errstr(result));
+ 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)) {
+ asprintf(err_str, "machine %s rejected the session setup. "
+ "Error was : %s.\n",
+ remote_machine, cli_errstr(cli) );
+ result = cli_nt_error(cli);
+ cli_shutdown(cli);
+ return result;
+ }
+
+ cli->protocol = PROTOCOL_NT1;
+
+ if (!cli_negprot(cli)) {
+ asprintf(err_str, "machine %s rejected the negotiate "
+ "protocol. Error was : %s.\n",
+ remote_machine, cli_errstr(cli) );
+ 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)) {
+ asprintf(err_str, "Could not connect to machine %s: "
+ "%s\n", remote_machine, cli_errstr(cli));
+ 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)) {
+ asprintf(err_str, "machine %s rejected the session "
+ "setup. Error was : %s.\n",
+ remote_machine, cli_errstr(cli) );
+ cli_shutdown(cli);
+ return result;
+ }
+
+ cli_init_creds(cli, "", "", NULL);
+ } else {
+ cli_init_creds(cli, user_name, "", old_passwd);
+ }
+
+ if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
+ asprintf(err_str, "machine %s rejected the tconX on the IPC$ "
+ "share. Error was : %s.\n",
+ remote_machine, cli_errstr(cli) );
+ result = cli_nt_error(cli);
+ 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,
+ PIPE_AUTH_LEVEL_PRIVACY,
+ "", /* what domain... ? */
+ user_name,
+ 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)) {
+ asprintf(err_str, "machine %s rejected the "
+ "password change: Error was : %s.\n",
+ remote_machine, cli_errstr(cli) );
+ result = cli_nt_error(cli);
+ cli_shutdown(cli);
+ return result;
+ }
+ } else {
+ asprintf(err_str, "SAMR connection to machine %s "
+ "failed. Error was %s, but LANMAN password "
+ "changed are disabled\n",
+ nt_errstr(result), remote_machine);
+ 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 ... */
+
+ asprintf(err_str, "machine %s rejected the password change: "
+ "Error was : %s.\n",
+ remote_machine, get_friendly_nt_error_msg(result));
+ cli_shutdown(cli);
+ return result;
+ }
+
+ /* OK, that failed, so try again... */
+ TALLOC_FREE(pipe_hnd);
+
+ /* Try anonymous NTLMSSP... */
+ cli_init_creds(cli, "", "", NULL);
+
+ 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 */
+
+ asprintf(err_str, "machine %s rejected the "
+ "(anonymous) password change: Error was : "
+ "%s.\n", remote_machine,
+ get_friendly_nt_error_msg(result));
+ 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;
+ }
+ asprintf(err_str, "machine %s rejected the password "
+ "change: Error was : %s.\n",
+ remote_machine, cli_errstr(cli) );
+ result = cli_nt_error(cli);
+ cli_shutdown(cli);
+ return result;
+ } else {
+ asprintf(err_str, "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 NT_STATUS_UNSUCCESSFUL;
+ }
+ }
+}
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