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                 if (asprintf(err_str, "Unable to find an IP address for machine "
  42                          "%s.\n", remote_machine) == -1) {
  43                         *err_str = NULL;
  44                 }
  45                 return NT_STATUS_UNSUCCESSFUL;
  46         }
  47
  48         cli = cli_initialise();
  49         if (!cli) {
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52
  53         result = cli_connect(cli, remote_machine, &ss);
  54         if (!NT_STATUS_IS_OK(result)) {
  55                 if (asprintf(err_str, "Unable to connect to SMB server on "
  56                          "machine %s. Error was : %s.\n",
  57                          remote_machine, nt_errstr(result))==-1) {
  58                         *err_str = NULL;
  59                 }
  60                 cli_shutdown(cli);
  61                 return result;
  62         }
  63
  64         make_nmb_name(&calling, global_myname() , 0x0);
  65         make_nmb_name(&called , remote_machine, 0x20);
  66
  67         if (!cli_session_request(cli, &calling, &called)) {
  68                 if (asprintf(err_str, "machine %s rejected the session setup. "
  69                          "Error was : %s.\n",
  70                          remote_machine, cli_errstr(cli)) == -1) {
  71                         *err_str = NULL;
  72                 }
  73                 result = cli_nt_error(cli);
  74                 cli_shutdown(cli);
  75                 return result;
  76         }
  77
  78         cli->protocol = PROTOCOL_NT1;
  79
  80         if (!cli_negprot(cli)) {
  81                 if (asprintf(err_str, "machine %s rejected the negotiate "
  82                          "protocol. Error was : %s.\n",
  83                          remote_machine, cli_errstr(cli)) == -1) {
  84                         *err_str = NULL;
  85                 }
  86                 result = cli_nt_error(cli);
  87                 cli_shutdown(cli);
  88                 return result;
  89         }
  90
  91         /* Given things like SMB signing, restrict anonymous and the like,
  92            try an authenticated connection first */
  93         result = cli_session_setup(cli, user_name,
  94                                    old_passwd, strlen(old_passwd)+1,
  95                                    old_passwd, strlen(old_passwd)+1, "");
  96
  97         if (!NT_STATUS_IS_OK(result)) {
  98
  99                 /* Password must change or Password expired are the only valid
 100                  * error conditions here from where we can proceed, the rest like
 101                  * account locked out or logon failure will lead to errors later
 102                  * anyway */
 103
 104                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
 105                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 106                         if (asprintf(err_str, "Could not connect to machine %s: "
 107                                  "%s\n", remote_machine, cli_errstr(cli)) == -1) {
 108                                 *err_str = NULL;
 109                         }
 110                         cli_shutdown(cli);
 111                         return result;
 112                 }
 113
 114                 pass_must_change = True;
 115
 116                 /*
 117                  * We should connect as the anonymous user here, in case
 118                  * the server has "must change password" checked...
 119                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 120                  */
 121
 122                 result = cli_session_setup(cli, "", "", 0, "", 0, "");
 123
 124                 if (!NT_STATUS_IS_OK(result)) {
 125                         if (asprintf(err_str, "machine %s rejected the session "
 126                                  "setup. Error was : %s.\n",
 127                                  remote_machine, cli_errstr(cli)) == -1) {
 128                                 *err_str = NULL;
 129                         }
 130                         cli_shutdown(cli);
 131                         return result;
 132                 }
 133
 134                 cli_init_creds(cli, "", "", NULL);
 135         } else {
 136                 cli_init_creds(cli, user_name, "", old_passwd);
 137         }
 138
 139         if (!cli_send_tconX(cli, "IPC$", "IPC", "", 1)) {
 140                 if (asprintf(err_str, "machine %s rejected the tconX on the IPC$ "
 141                          "share. Error was : %s.\n",
 142                          remote_machine, cli_errstr(cli)) == -1) {
 143                         *err_str = NULL;
 144                 }
 145                 result = cli_nt_error(cli);
 146                 cli_shutdown(cli);
 147                 return result;
 148         }
 149
 150         /* Try not to give the password away too easily */
 151
 152         if (!pass_must_change) {
 153                 result = cli_rpc_pipe_open_ntlmssp(cli,
 154                                                    &ndr_table_samr.syntax_id,
 155                                                    NCACN_NP,
 156                                                    PIPE_AUTH_LEVEL_PRIVACY,
 157                                                    "", /* what domain... ? */
 158                                                    user_name,
 159                                                    old_passwd,
 160                                                    &pipe_hnd);
 161         } else {
 162                 /*
 163                  * If the user password must be changed the ntlmssp bind will
 164                  * fail the same way as the session setup above did. The
 165                  * difference ist that with a pipe bind we don't get a good
 166                  * error message, the result will be that the rpc call below
 167                  * will just fail. So we do it anonymously, there's no other
 168                  * way.
 169                  */
 170                 result = cli_rpc_pipe_open_noauth(
 171                         cli, &ndr_table_samr.syntax_id, &pipe_hnd);
 172         }
 173
 174         if (!NT_STATUS_IS_OK(result)) {
 175                 if (lp_client_lanman_auth()) {
 176                         /* Use the old RAP method. */
 177                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 178                                 if (asprintf(err_str, "machine %s rejected the "
 179                                          "password change: Error was : %s.\n",
 180                                          remote_machine, cli_errstr(cli)) == -1) {
 181                                         *err_str = NULL;
 182                                 }
 183                                 result = cli_nt_error(cli);
 184                                 cli_shutdown(cli);
 185                                 return result;
 186                         }
 187                 } else {
 188                         if (asprintf(err_str, "SAMR connection to machine %s "
 189                                  "failed. Error was %s, but LANMAN password "
 190                                  "changes are disabled\n",
 191                                  remote_machine, nt_errstr(result)) == -1) {
 192                                 *err_str = NULL;
 193                         }
 194                         result = cli_nt_error(cli);
 195                         cli_shutdown(cli);
 196                         return result;
 197                 }
 198         }
 199
 200         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 201                                              user_name, new_passwd, old_passwd);
 202         if (NT_STATUS_IS_OK(result)) {
 203                 /* Great - it all worked! */
 204                 cli_shutdown(cli);
 205                 return NT_STATUS_OK;
 206
 207         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 208                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 209                 /* it failed, but for reasons such as wrong password, too short etc ... */
 210
 211                 if (asprintf(err_str, "machine %s rejected the password change: "
 212                          "Error was : %s.\n",
 213                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 214                         *err_str = NULL;
 215                 }
 216                 cli_shutdown(cli);
 217                 return result;
 218         }
 219
 220         /* OK, that failed, so try again... */
 221         TALLOC_FREE(pipe_hnd);
 222
 223         /* Try anonymous NTLMSSP... */
 224         cli_init_creds(cli, "", "", NULL);
 225
 226         result = NT_STATUS_UNSUCCESSFUL;
 227
 228         /* OK, this is ugly, but... try an anonymous pipe. */
 229         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 230                                           &pipe_hnd);
 231
 232         if ( NT_STATUS_IS_OK(result) &&
 233                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 234                                          pipe_hnd, talloc_tos(), user_name,
 235                                          new_passwd, old_passwd)))) {
 236                 /* Great - it all worked! */
 237                 cli_shutdown(cli);
 238                 return NT_STATUS_OK;
 239         } else {
 240                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 241                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 242                         /* it failed, but again it was due to things like new password too short */
 243
 244                         if (asprintf(err_str, "machine %s rejected the "
 245                                  "(anonymous) password change: Error was : "
 246                                  "%s.\n", remote_machine,
 247                                  get_friendly_nt_error_msg(result)) == -1) {
 248                                 *err_str = NULL;
 249                         }
 250                         cli_shutdown(cli);
 251                         return result;
 252                 }
 253
 254                 /* We have failed to change the user's password, and we think the server
 255                    just might not support SAMR password changes, so fall back */
 256
 257                 if (lp_client_lanman_auth()) {
 258                         /* Use the old RAP method. */
 259                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 260                                 /* SAMR failed, but the old LanMan protocol worked! */
 261
 262                                 cli_shutdown(cli);
 263                                 return NT_STATUS_OK;
 264                         }
 265                         if (asprintf(err_str, "machine %s rejected the password "
 266                                  "change: Error was : %s.\n",
 267                                  remote_machine, cli_errstr(cli)) == -1) {
 268                                 *err_str = NULL;
 269                         }
 270                         result = cli_nt_error(cli);
 271                         cli_shutdown(cli);
 272                         return result;
 273                 } else {
 274                         if (asprintf(err_str, "SAMR connection to machine %s "
 275                                  "failed. Error was %s, but LANMAN password "
 276                                  "changed are disabled\n",
 277                                 nt_errstr(result), remote_machine) == -1) {
 278                                 *err_str = NULL;
 279                         }
 280                         cli_shutdown(cli);
 281                         return NT_STATUS_UNSUCCESSFUL;
 282                 }
 283         }
 284 }