| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | SMB client password change routine
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| 4 | Copyright (C) Andrew Tridgell 1994-1998
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; if not, write to the Free Software
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| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 19 | */
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| 20 |
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| 21 | #include "includes.h"
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| 22 |
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| 23 | /*************************************************************
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| 24 | Change a password on a remote machine using IPC calls.
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| 25 | *************************************************************/
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| 26 |
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| 27 | NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
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| 28 | const char *old_passwd, const char *new_passwd,
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| 29 | char *err_str, size_t err_str_len)
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| 30 | {
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| 31 | struct nmb_name calling, called;
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| 32 | struct cli_state *cli;
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| 33 | struct rpc_pipe_client *pipe_hnd;
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| 34 | struct in_addr ip;
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| 35 |
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| 36 | NTSTATUS result;
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| 37 | BOOL pass_must_change = False;
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| 38 |
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| 39 | *err_str = '\0';
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| 40 |
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| 41 | if(!resolve_name( remote_machine, &ip, 0x20)) {
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| 42 | slprintf(err_str, err_str_len-1, "Unable to find an IP address for machine %s.\n",
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| 43 | remote_machine );
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| 44 | return NT_STATUS_UNSUCCESSFUL;
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| 45 | }
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| 46 |
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| 47 | cli = cli_initialise();
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| 48 | if (!cli) {
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| 49 | return NT_STATUS_NO_MEMORY;
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| 50 | }
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| 51 |
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| 52 | result = cli_connect(cli, remote_machine, &ip);
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| 53 | if (!NT_STATUS_IS_OK(result)) {
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| 54 | slprintf(err_str, err_str_len-1, "Unable to connect to SMB server on machine %s. Error was : %s.\n",
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| 55 | remote_machine, nt_errstr(result) );
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| 56 | cli_shutdown(cli);
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| 57 | return result;
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| 58 | }
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| 59 |
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| 60 | make_nmb_name(&calling, global_myname() , 0x0);
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| 61 | make_nmb_name(&called , remote_machine, 0x20);
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| 62 |
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| 63 | if (!cli_session_request(cli, &calling, &called)) {
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| 64 | slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
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| 65 | remote_machine, cli_errstr(cli) );
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| 66 | result = cli_nt_error(cli);
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| 67 | cli_shutdown(cli);
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| 68 | return result;
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| 69 | }
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| 70 |
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| 71 | cli->protocol = PROTOCOL_NT1;
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| 72 |
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| 73 | if (!cli_negprot(cli)) {
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| 74 | slprintf(err_str, err_str_len-1, "machine %s rejected the negotiate protocol. Error was : %s.\n",
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| 75 | remote_machine, cli_errstr(cli) );
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| 76 | result = cli_nt_error(cli);
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| 77 | cli_shutdown(cli);
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| 78 | return result;
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| 79 | }
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| 80 |
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| 81 | /* Given things like SMB signing, restrict anonymous and the like,
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| 82 | try an authenticated connection first */
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| 83 | result = cli_session_setup(cli, user_name,
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| 84 | old_passwd, strlen(old_passwd)+1,
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| 85 | old_passwd, strlen(old_passwd)+1, "");
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| 86 |
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| 87 | if (!NT_STATUS_IS_OK(result)) {
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| 88 |
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| 89 | /* Password must change or Password expired are the only valid
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| 90 | * error conditions here from where we can proceed, the rest like
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| 91 | * account locked out or logon failure will lead to errors later
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| 92 | * anyway */
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| 93 |
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| 94 | if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
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| 95 | !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
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| 96 | slprintf(err_str, err_str_len-1, "Could not "
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| 97 | "connect to machine %s: %s\n",
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| 98 | remote_machine, cli_errstr(cli));
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| 99 | cli_shutdown(cli);
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| 100 | return result;
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| 101 | }
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| 102 |
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| 103 | pass_must_change = True;
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| 104 |
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| 105 | /*
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| 106 | * We should connect as the anonymous user here, in case
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| 107 | * the server has "must change password" checked...
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| 108 | * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
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| 109 | */
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| 110 |
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| 111 | result = cli_session_setup(cli, "", "", 0, "", 0, "");
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| 112 |
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| 113 | if (!NT_STATUS_IS_OK(result)) {
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| 114 | slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
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| 115 | remote_machine, cli_errstr(cli) );
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| 116 | cli_shutdown(cli);
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| 117 | return result;
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| 118 | }
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| 119 |
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| 120 | cli_init_creds(cli, "", "", NULL);
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| 121 | } else {
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| 122 | cli_init_creds(cli, user_name, "", old_passwd);
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| 123 | }
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| 124 |
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| 125 | if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
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| 126 | slprintf(err_str, err_str_len-1, "machine %s rejected the tconX on the IPC$ share. Error was : %s.\n",
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| 127 | remote_machine, cli_errstr(cli) );
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| 128 | result = cli_nt_error(cli);
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| 129 | cli_shutdown(cli);
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| 130 | return result;
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| 131 | }
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| 132 |
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| 133 | /* Try not to give the password away too easily */
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| 134 |
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| 135 | if (!pass_must_change) {
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| 136 | pipe_hnd = cli_rpc_pipe_open_ntlmssp(cli,
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| 137 | PI_SAMR,
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| 138 | PIPE_AUTH_LEVEL_PRIVACY,
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| 139 | "", /* what domain... ? */
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| 140 | user_name,
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| 141 | old_passwd,
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| 142 | &result);
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| 143 | } else {
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| 144 | /*
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| 145 | * If the user password must be changed the ntlmssp bind will
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| 146 | * fail the same way as the session setup above did. The
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| 147 | * difference ist that with a pipe bind we don't get a good
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| 148 | * error message, the result will be that the rpc call below
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| 149 | * will just fail. So we do it anonymously, there's no other
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| 150 | * way.
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| 151 | */
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| 152 | pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
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| 153 | }
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| 154 |
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| 155 | if (!pipe_hnd) {
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| 156 | if (lp_client_lanman_auth()) {
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| 157 | /* Use the old RAP method. */
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| 158 | if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
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| 159 | slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
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| 160 | remote_machine, cli_errstr(cli) );
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| 161 | result = cli_nt_error(cli);
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| 162 | cli_shutdown(cli);
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| 163 | return result;
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| 164 | }
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| 165 | } else {
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| 166 | slprintf(err_str, err_str_len-1,
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| 167 | "SAMR connection to machine %s failed. Error was %s, "
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| 168 | "but LANMAN password changed are disabled\n",
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| 169 | nt_errstr(result), remote_machine);
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| 170 | result = cli_nt_error(cli);
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| 171 | cli_shutdown(cli);
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| 172 | return result;
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| 173 | }
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| 174 | }
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| 175 |
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| 176 | if (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd, cli->mem_ctx, user_name,
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| 177 | new_passwd, old_passwd))) {
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| 178 | /* Great - it all worked! */
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| 179 | cli_shutdown(cli);
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| 180 | return NT_STATUS_OK;
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| 181 |
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| 182 | } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
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| 183 | || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
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| 184 | /* it failed, but for reasons such as wrong password, too short etc ... */
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| 185 |
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| 186 | slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
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| 187 | remote_machine, get_friendly_nt_error_msg(result));
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| 188 | cli_shutdown(cli);
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| 189 | return result;
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| 190 | }
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| 191 |
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| 192 | /* OK, that failed, so try again... */
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| 193 | cli_rpc_pipe_close(pipe_hnd);
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| 194 |
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| 195 | /* Try anonymous NTLMSSP... */
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| 196 | cli_init_creds(cli, "", "", NULL);
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| 197 |
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| 198 | result = NT_STATUS_UNSUCCESSFUL;
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| 199 |
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| 200 | /* OK, this is ugly, but... try an anonymous pipe. */
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| 201 | pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
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| 202 |
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| 203 | if ( pipe_hnd &&
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| 204 | (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd,
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| 205 | cli->mem_ctx,
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| 206 | user_name,
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| 207 | new_passwd,
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| 208 | old_passwd)))) {
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| 209 | /* Great - it all worked! */
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| 210 | cli_shutdown(cli);
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| 211 | return NT_STATUS_OK;
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| 212 | } else {
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| 213 | if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
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| 214 | || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
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| 215 | /* it failed, but again it was due to things like new password too short */
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| 216 |
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| 217 | slprintf(err_str, err_str_len-1,
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| 218 | "machine %s rejected the (anonymous) password change: Error was : %s.\n",
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| 219 | remote_machine, get_friendly_nt_error_msg(result));
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| 220 | cli_shutdown(cli);
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| 221 | return result;
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| 222 | }
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| 223 |
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| 224 | /* We have failed to change the user's password, and we think the server
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| 225 | just might not support SAMR password changes, so fall back */
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| 226 |
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| 227 | if (lp_client_lanman_auth()) {
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| 228 | /* Use the old RAP method. */
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| 229 | if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
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| 230 | /* SAMR failed, but the old LanMan protocol worked! */
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| 231 |
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| 232 | cli_shutdown(cli);
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| 233 | return NT_STATUS_OK;
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| 234 | }
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| 235 | slprintf(err_str, err_str_len-1,
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| 236 | "machine %s rejected the password change: Error was : %s.\n",
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| 237 | remote_machine, cli_errstr(cli) );
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| 238 | result = cli_nt_error(cli);
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| 239 | cli_shutdown(cli);
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| 240 | return result;
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| 241 | } else {
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| 242 | slprintf(err_str, err_str_len-1,
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| 243 | "SAMR connection to machine %s failed. Error was %s, "
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| 244 | "but LANMAN password changed are disabled\n",
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| 245 | nt_errstr(result), remote_machine);
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| 246 | cli_shutdown(cli);
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| 247 | return NT_STATUS_UNSUCCESSFUL;
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| 248 | }
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| 249 | }
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| 250 | }
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