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
  25 /*************************************************************
  26  Change a password on a remote machine using IPC calls.
  27 *************************************************************/
  28
  29 NTSTATUS remote_password_change(const char *remote_machine, const char *user_name,
  30                                 const char *old_passwd, const char *new_passwd,
  31                                 char **err_str)
  32 {
  33         struct nmb_name calling, called;
  34         struct cli_state *cli = NULL;
  35         struct rpc_pipe_client *pipe_hnd = NULL;
  36         struct sockaddr_storage ss;
  37         char *user, *domain, *p;
  38
  39         NTSTATUS result;
  40         bool pass_must_change = False;
  41
  42         user = talloc_strdup(talloc_tos(), user_name);
  43         SMB_ASSERT(user != NULL);
  44         domain = talloc_strdup(talloc_tos(), "");
  45         SMB_ASSERT(domain != NULL);
  46
  47         /* allow usernames of the form domain\\user or domain/user */
  48         if ((p = strchr_m(user,'\\')) || (p = strchr_m(user,'/')) ||
  49             (p = strchr_m(user,*lp_winbind_separator()))) {
  50                 *p = 0;
  51                 domain = user;
  52                 user = p+1;
  53         }
  54
  55         *err_str = NULL;
  56
  57         if(!resolve_name( remote_machine, &ss, 0x20, false)) {
  58                 if (asprintf(err_str, "Unable to find an IP address for machine "
  59                          "%s.\n", remote_machine) == -1) {
  60                         *err_str = NULL;
  61                 }
  62                 return NT_STATUS_UNSUCCESSFUL;
  63         }
  64
  65         cli = cli_initialise();
  66         if (!cli) {
  67                 return NT_STATUS_NO_MEMORY;
  68         }
  69
  70         result = cli_connect(cli, remote_machine, &ss);
  71         if (!NT_STATUS_IS_OK(result)) {
  72                 if (asprintf(err_str, "Unable to connect to SMB server on "
  73                          "machine %s. Error was : %s.\n",
  74                          remote_machine, nt_errstr(result))==-1) {
  75                         *err_str = NULL;
  76                 }
  77                 cli_shutdown(cli);
  78                 return result;
  79         }
  80
  81         make_nmb_name(&calling, global_myname() , 0x0);
  82         make_nmb_name(&called , remote_machine, 0x20);
  83
  84         if (!cli_session_request(cli, &calling, &called)) {
  85                 if (asprintf(err_str, "machine %s rejected the session setup. "
  86                          "Error was : %s.\n",
  87                          remote_machine, cli_errstr(cli)) == -1) {
  88                         *err_str = NULL;
  89                 }
  90                 result = cli_nt_error(cli);
  91                 cli_shutdown(cli);
  92                 return result;
  93         }
  94
  95         cli->protocol = PROTOCOL_NT1;
  96
  97         result = cli_negprot(cli);
  98
  99         if (!NT_STATUS_IS_OK(result)) {
 100                 if (asprintf(err_str, "machine %s rejected the negotiate "
 101                          "protocol. Error was : %s.\n",
 102                          remote_machine, nt_errstr(result)) == -1) {
 103                         *err_str = NULL;
 104                 }
 105                 result = cli_nt_error(cli);
 106                 cli_shutdown(cli);
 107                 return result;
 108         }
 109
 110         /* Given things like SMB signing, restrict anonymous and the like,
 111            try an authenticated connection first */
 112         result = cli_session_setup(cli, user_name,
 113                                    old_passwd, strlen(old_passwd)+1,
 114                                    old_passwd, strlen(old_passwd)+1, "");
 115
 116         if (!NT_STATUS_IS_OK(result)) {
 117
 118                 /* Password must change or Password expired are the only valid
 119                  * error conditions here from where we can proceed, the rest like
 120                  * account locked out or logon failure will lead to errors later
 121                  * anyway */
 122
 123                 if (!NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_MUST_CHANGE) &&
 124                     !NT_STATUS_EQUAL(result, NT_STATUS_PASSWORD_EXPIRED)) {
 125                         if (asprintf(err_str, "Could not connect to machine %s: "
 126                                  "%s\n", remote_machine, cli_errstr(cli)) == -1) {
 127                                 *err_str = NULL;
 128                         }
 129                         cli_shutdown(cli);
 130                         return result;
 131                 }
 132
 133                 pass_must_change = True;
 134
 135                 /*
 136                  * We should connect as the anonymous user here, in case
 137                  * the server has "must change password" checked...
 138                  * Thanks to <Nicholas.S.Jenkins@cdc.com> for this fix.
 139                  */
 140
 141                 result = cli_session_setup(cli, "", "", 0, "", 0, "");
 142
 143                 if (!NT_STATUS_IS_OK(result)) {
 144                         if (asprintf(err_str, "machine %s rejected the session "
 145                                  "setup. Error was : %s.\n",
 146                                  remote_machine, cli_errstr(cli)) == -1) {
 147                                 *err_str = NULL;
 148                         }
 149                         cli_shutdown(cli);
 150                         return result;
 151                 }
 152
 153                 result = cli_init_creds(cli, "", "", NULL);
 154                 if (!NT_STATUS_IS_OK(result)) {
 155                         cli_shutdown(cli);
 156                         return result;
 157                 }
 158         } else {
 159                 result = cli_init_creds(cli, user, domain, old_passwd);
 160                 if (!NT_STATUS_IS_OK(result)) {
 161                         cli_shutdown(cli);
 162                         return result;
 163                 }
 164         }
 165
 166         result = cli_tcon_andx(cli, "IPC$", "IPC", "", 1);
 167         if (!NT_STATUS_IS_OK(result)) {
 168                 if (asprintf(err_str, "machine %s rejected the tconX on the "
 169                              "IPC$ share. Error was : %s.\n",
 170                              remote_machine, nt_errstr(result))) {
 171                         *err_str = NULL;
 172                 }
 173                 cli_shutdown(cli);
 174                 return result;
 175         }
 176
 177         /* Try not to give the password away too easily */
 178
 179         if (!pass_must_change) {
 180                 result = cli_rpc_pipe_open_ntlmssp(cli,
 181                                                    &ndr_table_samr.syntax_id,
 182                                                    NCACN_NP,
 183                                                    DCERPC_AUTH_LEVEL_PRIVACY,
 184                                                    domain, user,
 185                                                    old_passwd,
 186                                                    &pipe_hnd);
 187         } else {
 188                 /*
 189                  * If the user password must be changed the ntlmssp bind will
 190                  * fail the same way as the session setup above did. The
 191                  * difference ist that with a pipe bind we don't get a good
 192                  * error message, the result will be that the rpc call below
 193                  * will just fail. So we do it anonymously, there's no other
 194                  * way.
 195                  */
 196                 result = cli_rpc_pipe_open_noauth(
 197                         cli, &ndr_table_samr.syntax_id, &pipe_hnd);
 198         }
 199
 200         if (!NT_STATUS_IS_OK(result)) {
 201                 if (lp_client_lanman_auth()) {
 202                         /* Use the old RAP method. */
 203                         if (!cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 204                                 if (asprintf(err_str, "machine %s rejected the "
 205                                          "password change: Error was : %s.\n",
 206                                          remote_machine, cli_errstr(cli)) == -1) {
 207                                         *err_str = NULL;
 208                                 }
 209                                 result = cli_nt_error(cli);
 210                                 cli_shutdown(cli);
 211                                 return result;
 212                         }
 213                 } else {
 214                         if (asprintf(err_str, "SAMR connection to machine %s "
 215                                  "failed. Error was %s, but LANMAN password "
 216                                  "changes are disabled\n",
 217                                  remote_machine, nt_errstr(result)) == -1) {
 218                                 *err_str = NULL;
 219                         }
 220                         result = cli_nt_error(cli);
 221                         cli_shutdown(cli);
 222                         return result;
 223                 }
 224         }
 225
 226         result = rpccli_samr_chgpasswd_user2(pipe_hnd, talloc_tos(),
 227                                              user_name, new_passwd, old_passwd);
 228         if (NT_STATUS_IS_OK(result)) {
 229                 /* Great - it all worked! */
 230                 cli_shutdown(cli);
 231                 return NT_STATUS_OK;
 232
 233         } else if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 234                      || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 235                 /* it failed, but for reasons such as wrong password, too short etc ... */
 236
 237                 if (asprintf(err_str, "machine %s rejected the password change: "
 238                          "Error was : %s.\n",
 239                          remote_machine, get_friendly_nt_error_msg(result)) == -1) {
 240                         *err_str = NULL;
 241                 }
 242                 cli_shutdown(cli);
 243                 return result;
 244         }
 245
 246         /* OK, that failed, so try again... */
 247         TALLOC_FREE(pipe_hnd);
 248
 249         /* Try anonymous NTLMSSP... */
 250         result = cli_init_creds(cli, "", "", NULL);
 251         if (!NT_STATUS_IS_OK(result)) {
 252                 cli_shutdown(cli);
 253                 return result;
 254         }
 255
 256         result = NT_STATUS_UNSUCCESSFUL;
 257
 258         /* OK, this is ugly, but... try an anonymous pipe. */
 259         result = cli_rpc_pipe_open_noauth(cli, &ndr_table_samr.syntax_id,
 260                                           &pipe_hnd);
 261
 262         if ( NT_STATUS_IS_OK(result) &&
 263                 (NT_STATUS_IS_OK(result = rpccli_samr_chgpasswd_user2(
 264                                          pipe_hnd, talloc_tos(), user_name,
 265                                          new_passwd, old_passwd)))) {
 266                 /* Great - it all worked! */
 267                 cli_shutdown(cli);
 268                 return NT_STATUS_OK;
 269         } else {
 270                 if (!(NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED)
 271                       || NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL))) {
 272                         /* it failed, but again it was due to things like new password too short */
 273
 274                         if (asprintf(err_str, "machine %s rejected the "
 275                                  "(anonymous) password change: Error was : "
 276                                  "%s.\n", remote_machine,
 277                                  get_friendly_nt_error_msg(result)) == -1) {
 278                                 *err_str = NULL;
 279                         }
 280                         cli_shutdown(cli);
 281                         return result;
 282                 }
 283
 284                 /* We have failed to change the user's password, and we think the server
 285                    just might not support SAMR password changes, so fall back */
 286
 287                 if (lp_client_lanman_auth()) {
 288                         /* Use the old RAP method. */
 289                         if (cli_oem_change_password(cli, user_name, new_passwd, old_passwd)) {
 290                                 /* SAMR failed, but the old LanMan protocol worked! */
 291
 292                                 cli_shutdown(cli);
 293                                 return NT_STATUS_OK;
 294                         }
 295                         if (asprintf(err_str, "machine %s rejected the password "
 296                                  "change: Error was : %s.\n",
 297                                  remote_machine, cli_errstr(cli)) == -1) {
 298                                 *err_str = NULL;
 299                         }
 300                         result = cli_nt_error(cli);
 301                         cli_shutdown(cli);
 302                         return result;
 303                 } else {
 304                         if (asprintf(err_str, "SAMR connection to machine %s "
 305                                  "failed. Error was %s, but LANMAN password "
 306                                  "changes are disabled\n",
 307                                 nt_errstr(result), remote_machine) == -1) {
 308                                 *err_str = NULL;
 309                         }
 310                         cli_shutdown(cli);
 311                         return NT_STATUS_UNSUCCESSFUL;
 312                 }
 313         }
 314 }