source3/pam_smbpass/pam_smb_acct.c

   1 /* Unix NT password database implementation, version 0.7.5.
   2  *
   3  * This program is free software; you can redistribute it and/or modify it under
   4  * the terms of the GNU General Public License as published by the Free
   5  * Software Foundation; either version 3 of the License, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, see <http://www.gnu.org/licenses/>.
  15 */
  16
  17 /* indicate the following groups are defined */
  18 #define PAM_SM_ACCT
  19
  20 #include "includes.h"
  21
  22 #ifndef LINUX
  23
  24 /* This is only used in the Sun implementation. */
  25 #if defined(HAVE_SECURITY_PAM_APPL_H)
  26 #include <security/pam_appl.h>
  27 #elif defined(HAVE_PAM_PAM_APPL_H)
  28 #include <pam/pam_appl.h>
  29 #endif
  30
  31 #endif  /* LINUX */
  32
  33 #if defined(HAVE_SECURITY_PAM_MODULES_H)
  34 #include <security/pam_modules.h>
  35 #elif defined(HAVE_PAM_PAM_MODULES_H)
  36 #include <pam/pam_modules.h>
  37 #endif
  38
  39 #include "general.h"
  40
  41 #include "support.h"
  42
  43
  44 /*
  45  * pam_sm_acct_mgmt() verifies whether or not the account is disabled.
  46  *
  47  */
  48
  49 int pam_sm_acct_mgmt( pam_handle_t *pamh, int flags,
  50                       int argc, const char **argv )
  51 {
  52         unsigned int ctrl;
  53         int retval;
  54
  55         const char *name;
  56         struct samu *sampass = NULL;
  57         void (*oldsig_handler)(int);
  58         TALLOC_CTX *frame = talloc_stackframe();
  59
  60         /* Samba initialization. */
  61         load_case_tables_library();
  62
  63         ctrl = set_ctrl(pamh, flags, argc, argv );
  64
  65         /* get the username */
  66
  67         retval = pam_get_user( pamh, &name, "Username: " );
  68         if (retval != PAM_SUCCESS) {
  69                 if (on( SMB_DEBUG, ctrl )) {
  70                         _log_err(pamh, LOG_DEBUG, "acct: could not identify user" );
  71                 }
  72                 TALLOC_FREE(frame);
  73                 return retval;
  74         }
  75         if (on( SMB_DEBUG, ctrl )) {
  76                 _log_err(pamh, LOG_DEBUG, "acct: username [%s] obtained", name );
  77         }
  78
  79         if (geteuid() != 0) {
  80                 _log_err(pamh, LOG_DEBUG, "Cannot access samba password database, not running as root.");
  81                 TALLOC_FREE(frame);
  82                 return PAM_AUTHINFO_UNAVAIL;
  83         }
  84
  85         /* Getting into places that might use LDAP -- protect the app
  86                 from a SIGPIPE it's not expecting */
  87         oldsig_handler = CatchSignal(SIGPIPE, SIG_IGN);
  88         if (!initialize_password_db(True, NULL)) {
  89           _log_err(pamh, LOG_ALERT, "Cannot access samba password database" );
  90                 CatchSignal(SIGPIPE, oldsig_handler);
  91                 TALLOC_FREE(frame);
  92                 return PAM_AUTHINFO_UNAVAIL;
  93         }
  94
  95         /* Get the user's record. */
  96
  97         if (!(sampass = samu_new( NULL ))) {
  98                 CatchSignal(SIGPIPE, oldsig_handler);
  99                 /* malloc fail. */
 100                 TALLOC_FREE(frame);
 101                 return nt_status_to_pam(NT_STATUS_NO_MEMORY);
 102         }
 103
 104         if (!pdb_getsampwnam(sampass, name )) {
 105                 _log_err(pamh, LOG_DEBUG, "acct: could not identify user");
 106                 CatchSignal(SIGPIPE, oldsig_handler);
 107                 TALLOC_FREE(frame);
 108                 return PAM_USER_UNKNOWN;
 109         }
 110
 111         /* check for lookup failure */
 112         if (!strlen(pdb_get_username(sampass)) ) {
 113                 CatchSignal(SIGPIPE, oldsig_handler);
 114                 TALLOC_FREE(frame);
 115                 return PAM_USER_UNKNOWN;
 116         }
 117
 118         if (pdb_get_acct_ctrl(sampass) & ACB_DISABLED) {
 119                 if (on( SMB_DEBUG, ctrl )) {
 120                         _log_err(pamh, LOG_DEBUG,
 121                                  "acct: account %s is administratively disabled", name);
 122                 }
 123                 make_remark( pamh, ctrl, PAM_ERROR_MSG
 124                         , "Your account has been disabled; "
 125                         "please see your system administrator." );
 126
 127                 CatchSignal(SIGPIPE, oldsig_handler);
 128                 TALLOC_FREE(frame);
 129                 return PAM_ACCT_EXPIRED;
 130         }
 131
 132         /* TODO: support for expired passwords. */
 133
 134         CatchSignal(SIGPIPE, oldsig_handler);
 135         TALLOC_FREE(frame);
 136         return PAM_SUCCESS;
 137 }
 138
 139 /* static module data */
 140 #ifdef PAM_STATIC
 141 struct pam_module _pam_smbpass_acct_modstruct = {
 142      "pam_smbpass",
 143      NULL,
 144      NULL,
 145      pam_sm_acct_mgmt,
 146      NULL,
 147      NULL,
 148      NULL
 149 };
 150 #endif
 151