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