| 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 3 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, see <http://www.gnu.org/licenses/>.
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| 18 | */
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| 19 |
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| 20 | #include "includes.h"
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| 21 |
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| 22 | /*************************************************************
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| 23 | Change a password on a remote machine using IPC calls.
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| 24 | *************************************************************/
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| 25 |
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| 26 | NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
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| 27 | const char *old_passwd, const char *new_passwd,
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| 28 | char **err_str)
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| 29 | {
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| 30 | struct nmb_name calling, called;
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| 31 | struct cli_state *cli;
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| 32 | struct rpc_pipe_client *pipe_hnd;
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| 33 | struct sockaddr_storage ss;
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| 34 |
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| 35 | NTSTATUS result;
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| 36 | bool pass_must_change = False;
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| 37 |
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| 38 | *err_str = NULL;
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| 39 |
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| 40 | if(!resolve_name( remote_machine, &ss, 0x20)) {
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| 41 | asprintf(err_str, "Unable to find an IP address for machine "
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| 42 | "%s.\n", remote_machine);
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| 43 | return NT_STATUS_UNSUCCESSFUL;
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| 44 | }
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| 45 |
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| 46 | cli = cli_initialise();
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| 47 | if (!cli) {
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| 48 | return NT_STATUS_NO_MEMORY;
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| 49 | }
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| 50 |
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| 51 | result = cli_connect(cli, remote_machine, &ss);
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| 52 | if (!NT_STATUS_IS_OK(result)) {
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| 53 | asprintf(err_str, "Unable to connect to SMB server on "
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| 54 | "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 | asprintf(err_str, "machine %s rejected the session setup. "
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| 65 | "Error was : %s.\n",
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| 66 | remote_machine, cli_errstr(cli) );
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| 67 | result = cli_nt_error(cli);
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| 68 | cli_shutdown(cli);
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| 69 | return result;
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| 70 | }
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| 71 |
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| 72 | cli->protocol = PROTOCOL_NT1;
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| 73 |
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| 74 | if (!cli_negprot(cli)) {
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| 75 | asprintf(err_str, "machine %s rejected the negotiate "
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| 76 | "protocol. Error was : %s.\n",
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| 77 | remote_machine, cli_errstr(cli) );
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| 78 | result = cli_nt_error(cli);
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| 79 | cli_shutdown(cli);
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| 80 | return result;
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| 81 | }
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| 82 |
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| 83 | /* Given things like SMB signing, restrict anonymous and the like,
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| 84 | try an authenticated connection first */
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| 85 | result = cli_session_setup(cli, user_name,
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| 86 | old_passwd, strlen(old_passwd)+1,
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| 87 | old_passwd, strlen(old_passwd)+1, "");
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| 88 |
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| 89 | if (!NT_STATUS_IS_OK(result)) {
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| 90 |
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| 91 | /* Password must change or Password expired are the only valid
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| 92 | * error conditions here from where we can proceed, the rest like
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| 93 | * account locked out or logon failure will lead to errors later
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| 94 | * anyway */
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| 95 |
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| 96 | if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
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| 97 | !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
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| 98 | asprintf(err_str, "Could not connect to machine %s: "
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| 99 | "%s\n", remote_machine, cli_errstr(cli));
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| 100 | cli_shutdown(cli);
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| 101 | return result;
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| 102 | }
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| 103 |
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| 104 | pass_must_change = True;
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| 105 |
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| 106 | /*
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| 107 | * We should connect as the anonymous user here, in case
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| 108 | * the server has "must change password" checked...
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| 109 | * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
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| 110 | */
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| 111 |
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| 112 | result = cli_session_setup(cli, "", "", 0, "", 0, "");
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| 113 |
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| 114 | if (!NT_STATUS_IS_OK(result)) {
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| 115 | asprintf(err_str, "machine %s rejected the session "
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| 116 | "setup. Error was : %s.\n",
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| 117 | remote_machine, cli_errstr(cli) );
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| 118 | cli_shutdown(cli);
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| 119 | return result;
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| 120 | }
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| 121 |
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| 122 | cli_init_creds(cli, "", "", NULL);
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| 123 | } else {
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| 124 | cli_init_creds(cli, user_name, "", old_passwd);
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| 125 | }
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| 126 |
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| 127 | if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
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| 128 | asprintf(err_str, "machine %s rejected the tconX on the IPC$ "
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| 129 | "share. Error was : %s.\n",
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| 130 | remote_machine, cli_errstr(cli) );
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| 131 | result = cli_nt_error(cli);
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| 132 | cli_shutdown(cli);
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| 133 | return result;
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| 134 | }
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| 135 |
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| 136 | /* Try not to give the password away too easily */
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| 137 |
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| 138 | if (!pass_must_change) {
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| 139 | pipe_hnd = cli_rpc_pipe_open_ntlmssp(cli,
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| 140 | PI_SAMR,
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| 141 | PIPE_AUTH_LEVEL_PRIVACY,
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| 142 | "", /* what domain... ? */
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| 143 | user_name,
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| 144 | old_passwd,
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| 145 | &result);
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| 146 | } else {
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| 147 | /*
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| 148 | * If the user password must be changed the ntlmssp bind will
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| 149 | * fail the same way as the session setup above did. The
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| 150 | * difference ist that with a pipe bind we don't get a good
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| 151 | * error message, the result will be that the rpc call below
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| 152 | * will just fail. So we do it anonymously, there's no other
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| 153 | * way.
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| 154 | */
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| 155 | pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
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| 156 | }
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| 157 |
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| 158 | if (!pipe_hnd) {
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| 159 | if (lp_client_lanman_auth()) {
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| 160 | /* Use the old RAP method. */
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| 161 | if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
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| 162 | asprintf(err_str, "machine %s rejected the "
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| 163 | "password change: Error was : %s.\n",
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| 164 | remote_machine, cli_errstr(cli) );
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| 165 | result = cli_nt_error(cli);
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| 166 | cli_shutdown(cli);
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| 167 | return result;
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| 168 | }
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| 169 | } else {
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| 170 | asprintf(err_str, "SAMR connection to machine %s "
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| 171 | "failed. Error was %s, but LANMAN password "
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| 172 | "changes are disabled\n",
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| 173 | nt_errstr(result), remote_machine);
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| 174 | result = cli_nt_error(cli);
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| 175 | cli_shutdown(cli);
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| 176 | return result;
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| 177 | }
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| 178 | }
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| 179 |
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| 180 | if (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd, pipe_hnd->mem_ctx, user_name,
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| 181 | new_passwd, old_passwd))) {
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| 182 | /* Great - it all worked! */
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| 183 | cli_shutdown(cli);
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| 184 | return NT_STATUS_OK;
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| 185 |
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| 186 | } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
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| 187 | || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
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| 188 | /* it failed, but for reasons such as wrong password, too short etc ... */
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| 189 |
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| 190 | asprintf(err_str, "machine %s rejected the password change: "
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| 191 | "Error was : %s.\n",
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| 192 | remote_machine, get_friendly_nt_error_msg(result));
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| 193 | cli_shutdown(cli);
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| 194 | return result;
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| 195 | }
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| 196 |
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| 197 | /* OK, that failed, so try again... */
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| 198 | cli_rpc_pipe_close(pipe_hnd);
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| 199 |
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| 200 | /* Try anonymous NTLMSSP... */
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| 201 | cli_init_creds(cli, "", "", NULL);
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| 202 |
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| 203 | result = NT_STATUS_UNSUCCESSFUL;
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| 204 |
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| 205 | /* OK, this is ugly, but... try an anonymous pipe. */
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| 206 | pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
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| 207 |
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| 208 | if ( pipe_hnd &&
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| 209 | (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd,
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| 210 | pipe_hnd->mem_ctx,
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| 211 | user_name,
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| 212 | new_passwd,
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| 213 | old_passwd)))) {
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| 214 | /* Great - it all worked! */
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| 215 | cli_shutdown(cli);
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| 216 | return NT_STATUS_OK;
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| 217 | } else {
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| 218 | if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
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| 219 | || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
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| 220 | /* it failed, but again it was due to things like new password too short */
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| 221 |
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| 222 | asprintf(err_str, "machine %s rejected the "
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| 223 | "(anonymous) password change: Error was : "
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| 224 | "%s.\n", remote_machine,
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| 225 | get_friendly_nt_error_msg(result));
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| 226 | cli_shutdown(cli);
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| 227 | return result;
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| 228 | }
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| 229 |
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| 230 | /* We have failed to change the user's password, and we think the server
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| 231 | just might not support SAMR password changes, so fall back */
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| 232 |
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| 233 | if (lp_client_lanman_auth()) {
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| 234 | /* Use the old RAP method. */
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| 235 | if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
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| 236 | /* SAMR failed, but the old LanMan protocol worked! */
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| 237 |
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| 238 | cli_shutdown(cli);
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| 239 | return NT_STATUS_OK;
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| 240 | }
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| 241 | asprintf(err_str, "machine %s rejected the password "
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| 242 | "change: Error was : %s.\n",
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| 243 | remote_machine, cli_errstr(cli) );
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| 244 | result = cli_nt_error(cli);
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| 245 | cli_shutdown(cli);
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| 246 | return result;
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| 247 | } else {
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| 248 | asprintf(err_str, "SAMR connection to machine %s "
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| 249 | "failed. Error was %s, but LANMAN password "
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| 250 | "changed are disabled\n",
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| 251 | nt_errstr(result), remote_machine);
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| 252 | cli_shutdown(cli);
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| 253 | return NT_STATUS_UNSUCCESSFUL;
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| 254 | }
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| 255 | }
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| 256 | }
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