git.maemo.org Git - samba/blob - 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         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 False;
  45         }
  46
  47         ZERO_STRUCT(cli);
  48
  49         if (!cli_initialise(&cli) || !cli_connect(&cli, remote_machine, &ip)) {
  50                 slprintf(err_str, err_str_len-1, "unable to connect to SMB server on machine %s. Error was : %s.\n",
  51                         remote_machine, cli_errstr(&cli) );
  52                 return False;
  53         }
  54
  55         make_nmb_name(&calling, global_myname() , 0x0);
  56         make_nmb_name(&called , remote_machine, 0x20);
  57
  58         if (!cli_session_request(&cli, &calling, &called)) {
  59                 slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
  60                         remote_machine, cli_errstr(&cli) );
  61                 cli_shutdown(&cli);
  62                 return False;
  63         }
  64
  65         cli.protocol = PROTOCOL_NT1;
  66
  67         if (!cli_negprot(&cli)) {
  68                 slprintf(err_str, err_str_len-1, "machine %s rejected the negotiate protocol. Error was : %s.\n",
  69                         remote_machine, cli_errstr(&cli) );
  70                 cli_shutdown(&cli);
  71                 return False;
  72         }
  73
  74         /* Given things like SMB signing, restrict anonymous and the like,
  75            try an authenticated connection first */
  76         if (!cli_session_setup(&cli, user_name, old_passwd, strlen(old_passwd)+1, old_passwd, strlen(old_passwd)+1, "")) {
  77
  78                 result = cli_nt_error(&cli);
  79
  80                 if (!NT_STATUS_IS_OK(result)) {
  81
  82                         /* Password must change is the only valid error
  83                          * condition here from where we can proceed, the rest
  84                          * like account locked out or logon failure will lead
  85                          * to errors later anyway */
  86
  87                         if (!NT_STATUS_EQUAL(result,
  88                                              NT_STATUS_PASSWORD_MUST_CHANGE)) {
  89                                 slprintf(err_str, err_str_len-1, "Could not "
  90                                          "connect to machine %s: %s\n",
  91                                          remote_machine, cli_errstr(&cli));
  92                                 cli_shutdown(&cli);
  93                                 return False;
  94                         }
  95
  96                         pass_must_change = True;
  97                 }
  98
  99                 /*
 100                  * We should connect as the anonymous user here, in case
 101                  * the server has "must change password" checked...
 102                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 103                  */
 104
 105                 if (!cli_session_setup(&cli, "", "", 0, "", 0, "")) {
 106                         slprintf(err_str, err_str_len-1, "machine %s rejected the session setup. Error was : %s.\n",
 107                                  remote_machine, cli_errstr(&cli) );
 108                         cli_shutdown(&cli);
 109                         return False;
 110                 }
 111
 112                 cli_init_creds(&cli, "", "", NULL);
 113         } else {
 114                 cli_init_creds(&cli, user_name, "", old_passwd);
 115         }
 116
 117         if (!cli_send_tconX(&cli, "IPC$", "IPC", "", 1)) {
 118                 slprintf(err_str, err_str_len-1, "machine %s rejected the tconX on the IPC$ share. Error was : %s.\n",
 119                         remote_machine, cli_errstr(&cli) );
 120                 cli_shutdown(&cli);
 121                 return False;
 122         }
 123
 124         /* Try not to give the password away too easily */
 125
 126         if (!pass_must_change) {
 127                 pipe_hnd = cli_rpc_pipe_open_ntlmssp(&cli,
 128                                                 PI_SAMR,
 129                                                 PIPE_AUTH_LEVEL_PRIVACY,
 130                                                 "", /* what domain... ? */
 131                                                 user_name,
 132                                                 old_passwd,
 133                                                 &result);
 134         } else {
 135                 /*
 136                  * If the user password must be changed the ntlmssp bind will
 137                  * fail the same way as the session setup above did. The
 138                  * difference ist that with a pipe bind we don't get a good
 139                  * error message, the result will be that the rpc call below
 140                  * will just fail. So we do it anonymously, there's no other
 141                  * way.
 142                  */
 143                 pipe_hnd = cli_rpc_pipe_open_noauth(&cli, PI_SAMR, &result);
 144         }
 145
 146         if (!pipe_hnd) {
 147                 if (lp_client_lanman_auth()) {
 148                         /* Use the old RAP method. */
 149                         if (!cli_oem_change_password(&cli, user_name, new_passwd, old_passwd)) {
 150                                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 151                                          remote_machine, cli_errstr(&cli) );
 152                                 cli_shutdown(&cli);
 153                                 return False;
 154                         }
 155                 } else {
 156                         slprintf(err_str, err_str_len-1,
 157                                 "SAMR connection to machine %s failed. Error was %s, "
 158                                 "but LANMAN password changed are disabled\n",
 159                                 nt_errstr(result), remote_machine);
 160                         cli_shutdown(&cli);
 161                         return False;
 162                 }
 163         }
 164
 165         if (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd, cli.mem_ctx, user_name,
 166                                                              new_passwd, old_passwd))) {
 167                 /* Great - it all worked! */
 168                 cli_shutdown(&cli);
 169                 return True;
 170
 171         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 172                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 173                 /* it failed, but for reasons such as wrong password, too short etc ... */
 174
 175                 slprintf(err_str, err_str_len-1, "machine %s rejected the password change: Error was : %s.\n",
 176                          remote_machine, get_friendly_nt_error_msg(result));
 177                 cli_shutdown(&cli);
 178                 return False;
 179         }
 180
 181         /* OK, that failed, so try again... */
 182         cli_rpc_pipe_close(pipe_hnd);
 183
 184         /* Try anonymous NTLMSSP... */
 185         cli_init_creds(&cli, "", "", NULL);
 186
 187         result = NT_STATUS_UNSUCCESSFUL;
 188
 189         /* OK, this is ugly, but... try an anonymous pipe. */
 190         pipe_hnd = cli_rpc_pipe_open_noauth(&cli, PI_SAMR, &result);
 191
 192         if ( pipe_hnd &&
 193                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user(pipe_hnd,
 194                                                 cli.mem_ctx,
 195                                                 user_name,
 196                                                 new_passwd,
 197                                                 old_passwd)))) {
 198                 /* Great - it all worked! */
 199                 cli_shutdown(&cli);
 200                 return True;
 201         } else {
 202                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 203                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 204                         /* it failed, but again it was due to things like new password too short */
 205
 206                         slprintf(err_str, err_str_len-1,
 207                                  "machine %s rejected the (anonymous) password change: Error was : %s.\n",
 208                                  remote_machine, get_friendly_nt_error_msg(result));
 209                         cli_shutdown(&cli);
 210                         return False;
 211                 }
 212
 213                 /* We have failed to change the user's password, and we think the server
 214                    just might not support SAMR password changes, so fall back */
 215
 216                 if (lp_client_lanman_auth()) {
 217                         /* Use the old RAP method. */
 218                         if (cli_oem_change_password(&cli, user_name, new_passwd, old_passwd)) {
 219                                 /* SAMR failed, but the old LanMan protocol worked! */
 220
 221                                 cli_shutdown(&cli);
 222                                 return True;
 223                         }
 224                         slprintf(err_str, err_str_len-1,
 225                                  "machine %s rejected the password change: Error was : %s.\n",
 226                                  remote_machine, cli_errstr(&cli) );
 227                         cli_shutdown(&cli);
 228                         return False;
 229                 } else {
 230                         slprintf(err_str, err_str_len-1,
 231                                 "SAMR connection to machine %s failed. Error was %s, "
 232                                 "but LANMAN password changed are disabled\n",
 233                                 nt_errstr(result), remote_machine);
 234                         cli_shutdown(&cli);
 235                         return False;
 236                 }
 237         }
 238 }