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 #include "../librpc/gen_ndr/ndr_samr.h"
  22 #include "rpc_client/cli_pipe.h"
  23 #include "rpc_client/cli_samr.h"
  24 #include "libsmb/libsmb.h"
  25 #include "libsmb/clirap.h"
  26 #include "libsmb/nmblib.h"
  27 #include "../libcli/smb/smbXcli_base.h"
  28
  29 /*************************************************************
  30  Change a password on a remote machine using IPC calls.
  31 *************************************************************/
  32
  33 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
  34                                 const char *old_passwd, const char *new_passwd,
  35                                 char **err_str)
  36 {
  37         struct cli_state *cli = NULL;
  38         struct rpc_pipe_client *pipe_hnd = NULL;
  39         char *user, *domain, *p;
  40
  41         NTSTATUS result;
  42         bool pass_must_change = False;
  43
  44         user = talloc_strdup(talloc_tos(), user_name);
  45         SMB_ASSERT(user != NULL);
  46         domain = talloc_strdup(talloc_tos(), "");
  47         SMB_ASSERT(domain != NULL);
  48
  49         /* allow usernames of the form domain\\user or domain/user */
  50         if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
  51             (p = strchr_m(user,*lp_winbind_separator()))) {
  52                 *p = 0;
  53                 domain = user;
  54                 user = p+1;
  55         }
  56
  57         *err_str = NULL;
  58
  59         result = cli_connect_nb(remote_machine, NULL, 0, 0x20, NULL,
  60                                 SMB_SIGNING_DEFAULT, 0, &cli);
  61         if (!NT_STATUS_IS_OK(result)) {
  62                 if (asprintf(err_str, "Unable to connect to SMB server on "
  63                          "machine %s. Error was : %s.\n",
  64                          remote_machine, nt_errstr(result))==-1) {
  65                         *err_str = NULL;
  66                 }
  67                 return result;
  68         }
  69
  70         result = smbXcli_negprot(cli->conn, cli->timeout, PROTOCOL_CORE,
  71                                  PROTOCOL_NT1);
  72
  73         if (!NT_STATUS_IS_OK(result)) {
  74                 if (asprintf(err_str, "machine %s rejected the negotiate "
  75                          "protocol. Error was : %s.\n",
  76                          remote_machine, nt_errstr(result)) == -1) {
  77                         *err_str = NULL;
  78                 }
  79                 cli_shutdown(cli);
  80                 return result;
  81         }
  82
  83         /* Given things like SMB signing, restrict anonymous and the like,
  84            try an authenticated connection first */
  85         result = cli_session_setup(cli, user_name,
  86                                    old_passwd, strlen(old_passwd)+1,
  87                                    old_passwd, strlen(old_passwd)+1, "");
  88
  89         if (!NT_STATUS_IS_OK(result)) {
  90
  91                 /* Password must change or Password expired are the only valid
  92                  * error conditions here from where we can proceed, the rest like
  93                  * account locked out or logon failure will lead to errors later
  94                  * anyway */
  95
  96                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
  97                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
  98                         if (asprintf(err_str, "Could not connect to machine %s: "
  99                                  "%s\n", remote_machine, nt_errstr(result)) == -1) {
 100                                 *err_str = NULL;
 101                         }
 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                         if (asprintf(err_str, "machine %s rejected the session "
 118                                  "setup. Error was : %s.\n",
 119                                  remote_machine, nt_errstr(result)) == -1) {
 120                                 *err_str = NULL;
 121                         }
 122                         cli_shutdown(cli);
 123                         return result;
 124                 }
 125         }
 126
 127         result = cli_tree_connect(cli, "IPC$", "IPC", "", 1);
 128         if (!NT_STATUS_IS_OK(result)) {
 129                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 130                              "IPC$ share. Error was : %s.\n",
 131                              remote_machine, nt_errstr(result))) {
 132                         *err_str = NULL;
 133                 }
 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_generic_auth(cli,
 142                                                         &ndr_table_samr,
 143                                                         NCACN_NP,
 144                                                         CRED_DONT_USE_KERBEROS,
 145                                                         DCERPC_AUTH_TYPE_NTLMSSP,
 146                                                         DCERPC_AUTH_LEVEL_PRIVACY,
 147                                                         remote_machine,
 148                                                         domain, user,
 149                                                         old_passwd,
 150                                                         &pipe_hnd);
 151         } else {
 152                 /*
 153                  * If the user password must be changed the ntlmssp bind will
 154                  * fail the same way as the session setup above did. The
 155                  * difference ist that with a pipe bind we don't get a good
 156                  * error message, the result will be that the rpc call below
 157                  * will just fail. So we do it anonymously, there's no other
 158                  * way.
 159                  */
 160                 result = cli_rpc_pipe_open_noauth(
 161                         cli, &ndr_table_samr, &pipe_hnd);
 162         }
 163
 164         if (!NT_STATUS_IS_OK(result)) {
 165                 if (lp_client_lanman_auth()) {
 166                         /* Use the old RAP method. */
 167                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 168                                 result = cli_nt_error(cli);
 169                                 if (asprintf(err_str, "machine %s rejected the "
 170                                          "password change: Error was : %s.\n",
 171                                          remote_machine, nt_errstr(result)) == -1) {
 172                                         *err_str = NULL;
 173                                 }
 174                                 cli_shutdown(cli);
 175                                 return result;
 176                         }
 177                 } else {
 178                         if (asprintf(err_str, "SAMR connection to machine %s "
 179                                  "failed. Error was %s, but LANMAN password "
 180                                  "changes are disabled\n",
 181                                  remote_machine, nt_errstr(result)) == -1) {
 182                                 *err_str = NULL;
 183                         }
 184                         cli_shutdown(cli);
 185                         return result;
 186                 }
 187         }
 188
 189         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 190                                              user_name, new_passwd, old_passwd);
 191         if (NT_STATUS_IS_OK(result)) {
 192                 /* Great - it all worked! */
 193                 cli_shutdown(cli);
 194                 return NT_STATUS_OK;
 195
 196         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 197                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 198                 /* it failed, but for reasons such as wrong password, too short etc ... */
 199
 200                 if (asprintf(err_str, "machine %s rejected the password change: "
 201                          "Error was : %s.\n",
 202                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 203                         *err_str = NULL;
 204                 }
 205                 cli_shutdown(cli);
 206                 return result;
 207         }
 208
 209         /* OK, that failed, so try again... */
 210         TALLOC_FREE(pipe_hnd);
 211
 212         /* Try anonymous NTLMSSP... */
 213         result = NT_STATUS_UNSUCCESSFUL;
 214
 215         /* OK, this is ugly, but... try an anonymous pipe. */
 216         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr,
 217                                           &pipe_hnd);
 218
 219         if ( NT_STATUS_IS_OK(result) &&
 220                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 221                                          pipe_hnd, talloc_tos(), user_name,
 222                                          new_passwd, old_passwd)))) {
 223                 /* Great - it all worked! */
 224                 cli_shutdown(cli);
 225                 return NT_STATUS_OK;
 226         } else {
 227                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 228                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 229                         /* it failed, but again it was due to things like new password too short */
 230
 231                         if (asprintf(err_str, "machine %s rejected the "
 232                                  "(anonymous) password change: Error was : "
 233                                  "%s.\n", remote_machine,
 234                                  get_friendly_nt_error_msg(result)) == -1) {
 235                                 *err_str = NULL;
 236                         }
 237                         cli_shutdown(cli);
 238                         return result;
 239                 }
 240
 241                 /* We have failed to change the user's password, and we think the server
 242                    just might not support SAMR password changes, so fall back */
 243
 244                 if (lp_client_lanman_auth()) {
 245                         /* Use the old RAP method. */
 246                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 247                                 /* SAMR failed, but the old LanMan protocol worked! */
 248
 249                                 cli_shutdown(cli);
 250                                 return NT_STATUS_OK;
 251                         }
 252
 253                         result = cli_nt_error(cli);
 254                         if (asprintf(err_str, "machine %s rejected the password "
 255                                  "change: Error was : %s.\n",
 256                                  remote_machine, nt_errstr(result)) == -1) {
 257                                 *err_str = NULL;
 258                         }
 259                         cli_shutdown(cli);
 260                         return result;
 261                 } else {
 262                         if (asprintf(err_str, "SAMR connection to machine %s "
 263                                  "failed. Error was %s, but LANMAN password "
 264                                  "changes are disabled\n",
 265                                 nt_errstr(result), remote_machine) == -1) {
 266                                 *err_str = NULL;
 267                         }
 268                         cli_shutdown(cli);
 269                         return NT_STATUS_UNSUCCESSFUL;
 270                 }
 271         }
 272 }