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
  28 /*************************************************************
  29  Change a password on a remote machine using IPC calls.
  30 *************************************************************/
  31
  32 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
  33                                 const char *old_passwd, const char *new_passwd,
  34                                 char **err_str)
  35 {
  36         struct cli_state *cli = NULL;
  37         struct rpc_pipe_client *pipe_hnd = NULL;
  38         char *user, *domain, *p;
  39
  40         NTSTATUS result;
  41         bool pass_must_change = False;
  42
  43         user = talloc_strdup(talloc_tos(), user_name);
  44         SMB_ASSERT(user != NULL);
  45         domain = talloc_strdup(talloc_tos(), "");
  46         SMB_ASSERT(domain != NULL);
  47
  48         /* allow usernames of the form domain\\user or domain/user */
  49         if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
  50             (p = strchr_m(user,*lp_winbind_separator()))) {
  51                 *p = 0;
  52                 domain = user;
  53                 user = p+1;
  54         }
  55
  56         *err_str = NULL;
  57
  58         result = cli_connect_nb(remote_machine, NULL, 0, 0x20, NULL,
  59                                 Undefined, &cli);
  60         if (!NT_STATUS_IS_OK(result)) {
  61                 if (asprintf(err_str, "Unable to connect to SMB server on "
  62                          "machine %s. Error was : %s.\n",
  63                          remote_machine, nt_errstr(result))==-1) {
  64                         *err_str = NULL;
  65                 }
  66                 return result;
  67         }
  68
  69         cli->protocol = PROTOCOL_NT1;
  70
  71         result = cli_negprot(cli);
  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                 result = cli_nt_error(cli);
  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                 result = cli_init_creds(cli, "", "", NULL);
 128                 if (!NT_STATUS_IS_OK(result)) {
 129                         cli_shutdown(cli);
 130                         return result;
 131                 }
 132         } else {
 133                 result = cli_init_creds(cli, user, domain, old_passwd);
 134                 if (!NT_STATUS_IS_OK(result)) {
 135                         cli_shutdown(cli);
 136                         return result;
 137                 }
 138         }
 139
 140         result = cli_tcon_andx(cli, "IPC$", "IPC", "", 1);
 141         if (!NT_STATUS_IS_OK(result)) {
 142                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 143                              "IPC$ share. Error was : %s.\n",
 144                              remote_machine, nt_errstr(result))) {
 145                         *err_str = NULL;
 146                 }
 147                 cli_shutdown(cli);
 148                 return result;
 149         }
 150
 151         /* Try not to give the password away too easily */
 152
 153         if (!pass_must_change) {
 154                 result = cli_rpc_pipe_open_ntlmssp(cli,
 155                                                    &ndr_table_samr.syntax_id,
 156                                                    NCACN_NP,
 157                                                    DCERPC_AUTH_LEVEL_PRIVACY,
 158                                                    domain, user,
 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                                 result = cli_nt_error(cli);
 179                                 if (asprintf(err_str, "machine %s rejected the "
 180                                          "password change: Error was : %s.\n",
 181                                          remote_machine, nt_errstr(result)) == -1) {
 182                                         *err_str = NULL;
 183                                 }
 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         result = cli_init_creds(cli, "", "", NULL);
 225         if (!NT_STATUS_IS_OK(result)) {
 226                 cli_shutdown(cli);
 227                 return result;
 228         }
 229
 230         result = NT_STATUS_UNSUCCESSFUL;
 231
 232         /* OK, this is ugly, but... try an anonymous pipe. */
 233         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 234                                           &pipe_hnd);
 235
 236         if ( NT_STATUS_IS_OK(result) &&
 237                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 238                                          pipe_hnd, talloc_tos(), user_name,
 239                                          new_passwd, old_passwd)))) {
 240                 /* Great - it all worked! */
 241                 cli_shutdown(cli);
 242                 return NT_STATUS_OK;
 243         } else {
 244                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 245                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 246                         /* it failed, but again it was due to things like new password too short */
 247
 248                         if (asprintf(err_str, "machine %s rejected the "
 249                                  "(anonymous) password change: Error was : "
 250                                  "%s.\n", remote_machine,
 251                                  get_friendly_nt_error_msg(result)) == -1) {
 252                                 *err_str = NULL;
 253                         }
 254                         cli_shutdown(cli);
 255                         return result;
 256                 }
 257
 258                 /* We have failed to change the user's password, and we think the server
 259                    just might not support SAMR password changes, so fall back */
 260
 261                 if (lp_client_lanman_auth()) {
 262                         /* Use the old RAP method. */
 263                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 264                                 /* SAMR failed, but the old LanMan protocol worked! */
 265
 266                                 cli_shutdown(cli);
 267                                 return NT_STATUS_OK;
 268                         }
 269
 270                         result = cli_nt_error(cli);
 271                         if (asprintf(err_str, "machine %s rejected the password "
 272                                  "change: Error was : %s.\n",
 273                                  remote_machine, nt_errstr(result)) == -1) {
 274                                 *err_str = NULL;
 275                         }
 276                         cli_shutdown(cli);
 277                         return result;
 278                 } else {
 279                         if (asprintf(err_str, "SAMR connection to machine %s "
 280                                  "failed. Error was %s, but LANMAN password "
 281                                  "changes are disabled\n",
 282                                 nt_errstr(result), remote_machine) == -1) {
 283                                 *err_str = NULL;
 284                         }
 285                         cli_shutdown(cli);
 286                         return NT_STATUS_UNSUCCESSFUL;
 287                 }
 288         }
 289 }