source/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
  59         /* Samba initialization. */
  60         load_case_tables();
  61         setup_logging( "pam_smbpass", False );
  62         lp_set_in_client(True);
  63
  64         ctrl = set_ctrl( flags, argc, argv );
  65
  66         /* get the username */
  67
  68         retval = pam_get_user( pamh, &name, "Username: " );
  69         if (retval != PAM_SUCCESS) {
  70                 if (on( SMB_DEBUG, ctrl )) {
  71                         _log_err( LOG_DEBUG, "acct: could not identify user" );
  72                 }
  73                 return retval;
  74         }
  75         if (on( SMB_DEBUG, ctrl )) {
  76                 _log_err( LOG_DEBUG, "acct: username [%s] obtained", name );
  77         }
  78
  79         if (geteuid() != 0) {
  80                 _log_err( LOG_DEBUG, "Cannot access samba password database, not running as root.");
  81                 return PAM_AUTHINFO_UNAVAIL;
  82         }
  83
  84         /* Getting into places that might use LDAP -- protect the app
  85                 from a SIGPIPE it's not expecting */
  86         oldsig_handler = CatchSignal(SIGPIPE, SIGNAL_CAST SIG_IGN);
  87         if (!initialize_password_db(True, NULL)) {
  88                 _log_err( LOG_ALERT, "Cannot access samba password database" );
  89                 CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
  90                 return PAM_AUTHINFO_UNAVAIL;
  91         }
  92
  93         /* Get the user's record. */
  94
  95         if (!(sampass = samu_new( NULL ))) {
  96                 CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
  97                 /* malloc fail. */
  98                 return nt_status_to_pam(NT_STATUS_NO_MEMORY);
  99         }
 100
 101         if (!pdb_getsampwnam(sampass, name )) {
 102                 _log_err( LOG_DEBUG, "acct: could not identify user" );
 103                 CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
 104                 return PAM_USER_UNKNOWN;
 105         }
 106
 107         /* check for lookup failure */
 108         if (!strlen(pdb_get_username(sampass)) ) {
 109                 CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
 110                 return PAM_USER_UNKNOWN;
 111         }
 112
 113         if (pdb_get_acct_ctrl(sampass) & ACB_DISABLED) {
 114                 if (on( SMB_DEBUG, ctrl )) {
 115                         _log_err( LOG_DEBUG
 116                                 , "acct: account %s is administratively disabled", name );
 117                 }
 118                 make_remark( pamh, ctrl, PAM_ERROR_MSG
 119                         , "Your account has been disabled; "
 120                         "please see your system administrator." );
 121
 122                 CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
 123                 return PAM_ACCT_EXPIRED;
 124         }
 125
 126         /* TODO: support for expired passwords. */
 127
 128         CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler);
 129         return PAM_SUCCESS;
 130 }
 131
 132 /* static module data */
 133 #ifdef PAM_STATIC
 134 struct pam_module _pam_smbpass_acct_modstruct = {
 135      "pam_smbpass",
 136      NULL,
 137      NULL,
 138      pam_sm_acct_mgmt,
 139      NULL,
 140      NULL,
 141      NULL
 142 };
 143 #endif
 144