source3/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         result = cli_negprot(cli);
  75
  76         if (!NT_STATUS_IS_OK(result)) {
  77                 asprintf(err_str, "machine %s rejected the negotiate "
  78                          "protocol. Error was : %s.\n",
  79                          remote_machine, nt_errstr(result));
  80                 result = cli_nt_error(cli);
  81                 cli_shutdown(cli);
  82                 return result;
  83         }
  84
  85         /* Given things like SMB signing, restrict anonymous and the like,
  86            try an authenticated connection first */
  87         result = cli_session_setup(cli, user_name,
  88                                    old_passwd, strlen(old_passwd)+1,
  89                                    old_passwd, strlen(old_passwd)+1, "");
  90
  91         if (!NT_STATUS_IS_OK(result)) {
  92
  93                 /* Password must change or Password expired are the only valid
  94                  * error conditions here from where we can proceed, the rest like
  95                  * account locked out or logon failure will lead to errors later
  96                  * anyway */
  97
  98                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
  99                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 100                         asprintf(err_str, "Could not connect to machine %s: "
 101                                  "%s\n", remote_machine, cli_errstr(cli));
 102                         cli_shutdown(cli);
 103                         return result;
 104                 }
 105
 106                 pass_must_change = True;
 107
 108                 /*
 109                  * We should connect as the anonymous user here, in case
 110                  * the server has "must change password" checked...
 111                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 112                  */
 113
 114                 result = cli_session_setup(cli, "", "", 0, "", 0, "");
 115
 116                 if (!NT_STATUS_IS_OK(result)) {
 117                         asprintf(err_str, "machine %s rejected the session "
 118                                  "setup. Error was : %s.\n",
 119                                  remote_machine, cli_errstr(cli) );
 120                         cli_shutdown(cli);
 121                         return result;
 122                 }
 123
 124                 cli_init_creds(cli, "", "", NULL);
 125         } else {
 126                 cli_init_creds(cli, user_name, "", old_passwd);
 127         }
 128
 129         if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
 130                 asprintf(err_str, "machine %s rejected the tconX on the IPC$ "
 131                          "share. Error was : %s.\n",
 132                          remote_machine, cli_errstr(cli) );
 133                 result = cli_nt_error(cli);
 134                 cli_shutdown(cli);
 135                 return result;
 136         }
 137
 138         /* Try not to give the password away too easily */
 139
 140         if (!pass_must_change) {
 141                 result = cli_rpc_pipe_open_ntlmssp(cli,
 142                                                    &ndr_table_samr.syntax_id,
 143                                                    PIPE_AUTH_LEVEL_PRIVACY,
 144                                                    "", /* what domain... ? */
 145                                                    user_name,
 146                                                    old_passwd,
 147                                                    &pipe_hnd);
 148         } else {
 149                 /*
 150                  * If the user password must be changed the ntlmssp bind will
 151                  * fail the same way as the session setup above did. The
 152                  * difference ist that with a pipe bind we don't get a good
 153                  * error message, the result will be that the rpc call below
 154                  * will just fail. So we do it anonymously, there's no other
 155                  * way.
 156                  */
 157                 result = cli_rpc_pipe_open_noauth(
 158                         cli, &ndr_table_samr.syntax_id, &pipe_hnd);
 159         }
 160
 161         if (!NT_STATUS_IS_OK(result)) {
 162                 if (lp_client_lanman_auth()) {
 163                         /* Use the old RAP method. */
 164                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 165                                 asprintf(err_str, "machine %s rejected the "
 166                                          "password change: Error was : %s.\n",
 167                                          remote_machine, cli_errstr(cli) );
 168                                 result = cli_nt_error(cli);
 169                                 cli_shutdown(cli);
 170                                 return result;
 171                         }
 172                 } else {
 173                         asprintf(err_str, "SAMR connection to machine %s "
 174                                  "failed. Error was %s, but LANMAN password "
 175                                  "changed are disabled\n",
 176                                  nt_errstr(result), remote_machine);
 177                         result = cli_nt_error(cli);
 178                         cli_shutdown(cli);
 179                         return result;
 180                 }
 181         }
 182
 183         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 184                                              user_name, new_passwd, old_passwd);
 185         if (NT_STATUS_IS_OK(result)) {
 186                 /* Great - it all worked! */
 187                 cli_shutdown(cli);
 188                 return NT_STATUS_OK;
 189
 190         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 191                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 192                 /* it failed, but for reasons such as wrong password, too short etc ... */
 193
 194                 asprintf(err_str, "machine %s rejected the password change: "
 195                          "Error was : %s.\n",
 196                          remote_machine, get_friendly_nt_error_msg(result));
 197                 cli_shutdown(cli);
 198                 return result;
 199         }
 200
 201         /* OK, that failed, so try again... */
 202         TALLOC_FREE(pipe_hnd);
 203
 204         /* Try anonymous NTLMSSP... */
 205         cli_init_creds(cli, "", "", NULL);
 206
 207         result = NT_STATUS_UNSUCCESSFUL;
 208
 209         /* OK, this is ugly, but... try an anonymous pipe. */
 210         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 211                                           &pipe_hnd);
 212
 213         if ( NT_STATUS_IS_OK(result) &&
 214                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 215                                          pipe_hnd, talloc_tos(), user_name,
 216                                          new_passwd, old_passwd)))) {
 217                 /* Great - it all worked! */
 218                 cli_shutdown(cli);
 219                 return NT_STATUS_OK;
 220         } else {
 221                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 222                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 223                         /* it failed, but again it was due to things like new password too short */
 224
 225                         asprintf(err_str, "machine %s rejected the "
 226                                  "(anonymous) password change: Error was : "
 227                                  "%s.\n", remote_machine,
 228                                  get_friendly_nt_error_msg(result));
 229                         cli_shutdown(cli);
 230                         return result;
 231                 }
 232
 233                 /* We have failed to change the user's password, and we think the server
 234                    just might not support SAMR password changes, so fall back */
 235
 236                 if (lp_client_lanman_auth()) {
 237                         /* Use the old RAP method. */
 238                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 239                                 /* SAMR failed, but the old LanMan protocol worked! */
 240
 241                                 cli_shutdown(cli);
 242                                 return NT_STATUS_OK;
 243                         }
 244                         asprintf(err_str, "machine %s rejected the password "
 245                                  "change: Error was : %s.\n",
 246                                  remote_machine, cli_errstr(cli) );
 247                         result = cli_nt_error(cli);
 248                         cli_shutdown(cli);
 249                         return result;
 250                 } else {
 251                         asprintf(err_str, "SAMR connection to machine %s "
 252                                  "failed. Error was %s, but LANMAN password "
 253                                  "changed are disabled\n",
 254                                 nt_errstr(result), remote_machine);
 255                         cli_shutdown(cli);
 256                         return NT_STATUS_UNSUCCESSFUL;
 257                 }
 258         }
 259 }