source/libsmb/passchange.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client password change routine
   4    Copyright (C) Andrew Tridgell 1994-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 /*************************************************************
  23  Change a password on a remote machine using IPC calls.
  24 *************************************************************/
  25
  26 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
  27                                 const char *old_passwd, const char *new_passwd,
  28                                 char **err_str)
  29 {
  30         struct nmb_name calling, called;
  31         struct cli_state *cli;
  32         struct rpc_pipe_client *pipe_hnd;
  33         struct sockaddr_storage ss;
  34
  35         NTSTATUS result;
  36         bool pass_must_change = False;
  37
  38         *err_str = NULL;
  39
  40         if(!resolve_name( remote_machine, &ss, 0x20)) {
  41                 asprintf(err_str, "Unable to find an IP address for machine "
  42                          "%s.\n", remote_machine);
  43                 return NT_STATUS_UNSUCCESSFUL;
  44         }
  45
  46         cli = cli_initialise();
  47         if (!cli) {
  48                 return NT_STATUS_NO_MEMORY;
  49         }
  50
  51         result = cli_connect(cli, remote_machine, &ss);
  52         if (!NT_STATUS_IS_OK(result)) {
  53                 asprintf(err_str, "Unable to connect to SMB server on "
  54                          "machine %s. Error was : %s.\n",
  55                          remote_machine, nt_errstr(result));
  56                 cli_shutdown(cli);
  57                 return result;
  58         }
  59
  60         make_nmb_name(&calling, global_myname() , 0x0);
  61         make_nmb_name(&called , remote_machine, 0x20);
  62
  63         if (!cli_session_request(cli, &calling, &called)) {
  64                 asprintf(err_str, "machine %s rejected the session setup. "
  65                          "Error was : %s.\n",
  66                          remote_machine, cli_errstr(cli) );
  67                 result = cli_nt_error(cli);
  68                 cli_shutdown(cli);
  69                 return result;
  70         }
  71
  72         cli->protocol = PROTOCOL_NT1;
  73
  74         if (!cli_negprot(cli)) {
  75                 asprintf(err_str, "machine %s rejected the negotiate "
  76                          "protocol. Error was : %s.\n",
  77                          remote_machine, cli_errstr(cli) );
  78                 result = cli_nt_error(cli);
  79                 cli_shutdown(cli);
  80                 return result;
  81         }
  82
  83         /* Given things like SMB signing, restrict anonymous and the like,
  84            try an authenticated connection first */
  85         result = cli_session_setup(cli, user_name,
  86                                    old_passwd, strlen(old_passwd)+1,
  87                                    old_passwd, strlen(old_passwd)+1, "");
  88
  89         if (!NT_STATUS_IS_OK(result)) {
  90
  91                 /* Password must change or Password expired are the only valid
  92                  * error conditions here from where we can proceed, the rest like
  93                  * account locked out or logon failure will lead to errors later
  94                  * anyway */
  95
  96                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
  97                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
  98                         asprintf(err_str, "Could not connect to machine %s: "
  99                                  "%s\n", remote_machine, cli_errstr(cli));
 100                         cli_shutdown(cli);
 101                         return result;
 102                 }
 103
 104                 pass_must_change = True;
 105
 106                 /*
 107                  * We should connect as the anonymous user here, in case
 108                  * the server has "must change password" checked...
 109                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 110                  */
 111
 112                 result = cli_session_setup(cli, "", "", 0, "", 0, "");
 113
 114                 if (!NT_STATUS_IS_OK(result)) {
 115                         asprintf(err_str, "machine %s rejected the session "
 116                                  "setup. Error was : %s.\n",
 117                                  remote_machine, cli_errstr(cli) );
 118                         cli_shutdown(cli);
 119                         return result;
 120                 }
 121
 122                 cli_init_creds(cli, "", "", NULL);
 123         } else {
 124                 cli_init_creds(cli, user_name, "", old_passwd);
 125         }
 126
 127         if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
 128                 asprintf(err_str, "machine %s rejected the tconX on the IPC$ "
 129                          "share. Error was : %s.\n",
 130                          remote_machine, cli_errstr(cli) );
 131                 result = cli_nt_error(cli);
 132                 cli_shutdown(cli);
 133                 return result;
 134         }
 135
 136         /* Try not to give the password away too easily */
 137
 138         if (!pass_must_change) {
 139                 pipe_hnd = cli_rpc_pipe_open_ntlmssp(cli,
 140                                                 PI_SAMR,
 141                                                 PIPE_AUTH_LEVEL_PRIVACY,
 142                                                 "", /* what domain... ? */
 143                                                 user_name,
 144                                                 old_passwd,
 145                                                 &result);
 146         } else {
 147                 /*
 148                  * If the user password must be changed the ntlmssp bind will
 149                  * fail the same way as the session setup above did. The
 150                  * difference ist that with a pipe bind we don't get a good
 151                  * error message, the result will be that the rpc call below
 152                  * will just fail. So we do it anonymously, there's no other
 153                  * way.
 154                  */
 155                 pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
 156         }
 157
 158         if (!pipe_hnd) {
 159                 if (lp_client_lanman_auth()) {
 160                         /* Use the old RAP method. */
 161                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 162                                 asprintf(err_str, "machine %s rejected the "
 163                                          "password change: Error was : %s.\n",
 164                                          remote_machine, cli_errstr(cli) );
 165                                 result = cli_nt_error(cli);
 166                                 cli_shutdown(cli);
 167                                 return result;
 168                         }
 169                 } else {
 170                         asprintf(err_str, "SAMR connection to machine %s "
 171                                  "failed. Error was %s, but LANMAN password "
 172                                  "changed are disabled\n",
 173                                  nt_errstr(result), remote_machine);
 174                         result = cli_nt_error(cli);
 175                         cli_shutdown(cli);
 176                         return result;
 177                 }
 178         }
 179
 180         result = rpccli_samr_chgpasswd_user(pipe_hnd, talloc_tos(),
 181                                             user_name, new_passwd, old_passwd);
 182         if (NT_STATUS_IS_OK(result)) {
 183                 /* Great - it all worked! */
 184                 cli_shutdown(cli);
 185                 return NT_STATUS_OK;
 186
 187         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 188                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 189                 /* it failed, but for reasons such as wrong password, too short etc ... */
 190
 191                 asprintf(err_str, "machine %s rejected the password change: "
 192                          "Error was : %s.\n",
 193                          remote_machine, get_friendly_nt_error_msg(result));
 194                 cli_shutdown(cli);
 195                 return result;
 196         }
 197
 198         /* OK, that failed, so try again... */
 199         cli_rpc_pipe_close(pipe_hnd);
 200
 201         /* Try anonymous NTLMSSP... */
 202         cli_init_creds(cli, "", "", NULL);
 203
 204         result = NT_STATUS_UNSUCCESSFUL;
 205
 206         /* OK, this is ugly, but... try an anonymous pipe. */
 207         pipe_hnd = cli_rpc_pipe_open_noauth(cli, PI_SAMR, &result);
 208
 209         if ( pipe_hnd &&
 210                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(
 211                                          pipe_hnd, talloc_tos(), user_name,
 212                                          new_passwd, old_passwd)))) {
 213                 /* Great - it all worked! */
 214                 cli_shutdown(cli);
 215                 return NT_STATUS_OK;
 216         } else {
 217                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 218                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 219                         /* it failed, but again it was due to things like new password too short */
 220
 221                         asprintf(err_str, "machine %s rejected the "
 222                                  "(anonymous) password change: Error was : "
 223                                  "%s.\n", remote_machine,
 224                                  get_friendly_nt_error_msg(result));
 225                         cli_shutdown(cli);
 226                         return result;
 227                 }
 228
 229                 /* We have failed to change the user's password, and we think the server
 230                    just might not support SAMR password changes, so fall back */
 231
 232                 if (lp_client_lanman_auth()) {
 233                         /* Use the old RAP method. */
 234                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 235                                 /* SAMR failed, but the old LanMan protocol worked! */
 236
 237                                 cli_shutdown(cli);
 238                                 return NT_STATUS_OK;
 239                         }
 240                         asprintf(err_str, "machine %s rejected the password "
 241                                  "change: Error was : %s.\n",
 242                                  remote_machine, cli_errstr(cli) );
 243                         result = cli_nt_error(cli);
 244                         cli_shutdown(cli);
 245                         return result;
 246                 } else {
 247                         asprintf(err_str, "SAMR connection to machine %s "
 248                                  "failed. Error was %s, but LANMAN password "
 249                                  "changed are disabled\n",
 250                                 nt_errstr(result), remote_machine);
 251                         cli_shutdown(cli);
 252                         return NT_STATUS_UNSUCCESSFUL;
 253                 }
 254         }
 255 }