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 2 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 BOOL 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
  38         *err_str = '\0';
  39
  40         if(!resolve_name( remote_machine, &ip, 0x20)) {
  41                 slprintf(err_str, err_str_len-1, "unable to find an IP address for machine %s.\n",
  42                         remote_machine );
  43                 return False;
  44         }
  45
  46         ZERO_STRUCT(cli);
  47
  48         if (!cli_initialise(&cli) || !cli_connect(&cli, remote_machine, &ip)) {
  49                 slprintf(err_str, err_str_len-1, "unable to connect to SMB server on machine %s. Error was : %s.\n",
  50                         remote_machine, cli_errstr(&cli) );
  51                 return False;
  52         }
  53
  54         make_nmb_name(&calling, global_myname() , 0x0);
  55         make_nmb_name(&called , remote_machine, 0x20);
  56
  57         if (!cli_session_request(&cli, &calling, &called)) {
  58                 slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
  59                         remote_machine, cli_errstr(&cli) );
  60                 cli_shutdown(&cli);
  61                 return False;
  62         }
  63
  64         cli.protocol = PROTOCOL_NT1;
  65
  66         if (!cli_negprot(&cli)) {
  67                 slprintf(err_str, err_str_len-1, "machine %s rejected the negotiate protocol. Error was : %s.\n",
  68                         remote_machine, cli_errstr(&cli) );
  69                 cli_shutdown(&cli);
  70                 return False;
  71         }
  72
  73         /* Given things like SMB signing, restrict anonymous and the like,
  74            try an authenticated connection first */
  75         if (!cli_session_setup(&cli, user_name, old_passwd, strlen(old_passwd)+1, old_passwd, strlen(old_passwd)+1, "")) {
  76                 /*
  77                  * We should connect as the anonymous user here, in case
  78                  * the server has "must change password" checked...
  79                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
  80                  */
  81
  82                 if (!cli_session_setup(&cli, "", "", 0, "", 0, "")) {
  83                         slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
  84                                  remote_machine, cli_errstr(&cli) );
  85                         cli_shutdown(&cli);
  86                         return False;
  87                 }
  88
  89                 cli_init_creds(&cli, "", "", NULL);
  90         } else {
  91                 cli_init_creds(&cli, user_name, "", old_passwd);
  92         }
  93
  94         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
  95                 slprintf(err_str, err_str_len-1, "machine %s rejected the tconX on the IPC$ share. Error was : %s.\n",
  96                         remote_machine, cli_errstr(&cli) );
  97                 cli_shutdown(&cli);
  98                 return False;
  99         }
 100
 101         /* Try not to give the password away too easily */
 102
 103         pipe_hnd = cli_rpc_pipe_open_ntlmssp(&cli,
 104                                                 PI_SAMR,
 105                                                 PIPE_AUTH_LEVEL_PRIVACY,
 106                                                 "", /* what domain... ? */
 107                                                 user_name,
 108                                                 old_passwd,
 109                                                 &result);
 110
 111         if (!pipe_hnd) {
 112                 if (lp_client_lanman_auth()) {
 113                         /* Use the old RAP method. */
 114                         if (!cli_oem_change_password(&cli, user_name, new_passwd, old_passwd)) {
 115                                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 116                                          remote_machine, cli_errstr(&cli) );
 117                                 cli_shutdown(&cli);
 118                                 return False;
 119                         }
 120                 } else {
 121                         slprintf(err_str, err_str_len-1,
 122                                 "SAMR connection to machine %s failed. Error was %s, "
 123                                 "but LANMAN password changed are disabled\n",
 124                                 nt_errstr(result), remote_machine);
 125                         cli_shutdown(&cli);
 126                         return False;
 127                 }
 128         }
 129
 130         if (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd, cli.mem_ctx, user_name,
 131                                                              new_passwd, old_passwd))) {
 132                 /* Great - it all worked! */
 133                 cli_shutdown(&cli);
 134                 return True;
 135
 136         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 137                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 138                 /* it failed, but for reasons such as wrong password, too short etc ... */
 139
 140                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 141                          remote_machine, get_friendly_nt_error_msg(result));
 142                 cli_shutdown(&cli);
 143                 return False;
 144         }
 145
 146         /* OK, that failed, so try again... */
 147         cli_rpc_pipe_close(pipe_hnd);
 148
 149         /* Try anonymous NTLMSSP... */
 150         cli_init_creds(&cli, "", "", NULL);
 151
 152         result = NT_STATUS_UNSUCCESSFUL;
 153
 154         /* OK, this is ugly, but... try an anonymous pipe. */
 155         pipe_hnd = cli_rpc_pipe_open_noauth(&cli, PI_SAMR, &result);
 156
 157         if ( pipe_hnd &&
 158                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd,
 159                                                 cli.mem_ctx,
 160                                                 user_name,
 161                                                 new_passwd,
 162                                                 old_passwd)))) {
 163                 /* Great - it all worked! */
 164                 cli_shutdown(&cli);
 165                 return True;
 166         } else {
 167                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 168                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 169                         /* it failed, but again it was due to things like new password too short */
 170
 171                         slprintf(err_str, err_str_len-1,
 172                                  "machine %s rejected the (anonymous) password change: Error was : %s.\n",
 173                                  remote_machine, get_friendly_nt_error_msg(result));
 174                         cli_shutdown(&cli);
 175                         return False;
 176                 }
 177
 178                 /* We have failed to change the user's password, and we think the server
 179                    just might not support SAMR password changes, so fall back */
 180
 181                 if (lp_client_lanman_auth()) {
 182                         /* Use the old RAP method. */
 183                         if (cli_oem_change_password(&cli, user_name, new_passwd, old_passwd)) {
 184                                 /* SAMR failed, but the old LanMan protocol worked! */
 185
 186                                 cli_shutdown(&cli);
 187                                 return True;
 188                         }
 189                         slprintf(err_str, err_str_len-1,
 190                                  "machine %s rejected the password change: Error was : %s.\n",
 191                                  remote_machine, cli_errstr(&cli) );
 192                         cli_shutdown(&cli);
 193                         return False;
 194                 } else {
 195                         slprintf(err_str, err_str_len-1,
 196                                 "SAMR connection to machine %s failed. Error was %s, "
 197                                 "but LANMAN password changed are disabled\n",
 198                                 nt_errstr(result), remote_machine);
 199                         cli_shutdown(&cli);
 200                         return False;
 201                 }
 202         }
 203 }