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