1  /*
       2   * Redistribution and use in source and binary forms, with or without
       3   * modification, are permitted provided that the following conditions
       4   * are met:
       5   * 1. Redistributions of source code must retain the above copyright
       6   *    notice, and the entire permission notice in its entirety,
       7   *    including the disclaimer of warranties.
       8   * 2. Redistributions in binary form must reproduce the above copyright
       9   *    notice, this list of conditions and the following disclaimer in the
      10   *    documentation and/or other materials provided with the distribution.
      11   * 3. The name of the author may not be used to endorse or promote
      12   *    products derived from this software without specific prior
      13   *    written permission.
      14   *
      15   * ALTERNATIVELY, this product may be distributed under the terms of
      16   * the GNU Public License, in which case the provisions of the GPL are
      17   * required INSTEAD OF the above restrictions.  (This clause is
      18   * necessary due to a potential bad interaction between the GPL and
      19   * the restrictions contained in a BSD-style copyright.)
      20   *
      21   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
      22   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      23   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
      24   * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
      25   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
      26   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
      27   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      28   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
      29   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      30   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
      31   * OF THE POSSIBILITY OF SUCH DAMAGE.
      32   */
      33  
      34  #include "config.h"
      35  
      36  #include <stdio.h>
      37  #include <stdlib.h>
      38  #include <unistd.h>
      39  #include <stdarg.h>
      40  #include <errno.h>
      41  
      42  #include <security/pam_modules.h>
      43  #include <security/_pam_macros.h>
      44  #include <security/pam_ext.h>
      45  
      46  #include "pam_private.h"
      47  
      48  #ifndef LOG_AUTHPRIV
      49  #define LOG_AUTHPRIV LOG_AUTH
      50  #endif
      51  
      52  static const char *
      53  _pam_choice2str (int choice)
      54  {
      55    switch (choice)
      56      {
      57      case PAM_AUTHENTICATE:
      58        return "auth";
      59      case PAM_SETCRED:
      60        return "setcred";
      61      case PAM_ACCOUNT:
      62        return "account";
      63      case PAM_OPEN_SESSION:
      64      case PAM_CLOSE_SESSION:
      65        return "session";
      66      case PAM_CHAUTHTOK:
      67        return "chauthtok";
      68      }
      69    return "";
      70  }
      71  
      72  void
      73  pam_vsyslog (const pam_handle_t *pamh, int priority,
      74  	     const char *fmt, va_list args)
      75  {
      76    char *msgbuf1 = NULL, *msgbuf2 = NULL;
      77    int save_errno = errno;
      78  
      79    if (pamh && pamh->mod_name)
      80      {
      81        if (asprintf (&msgbuf1, "%s(%s:%s):", pamh->mod_name,
      82  		    pamh->service_name?pamh->service_name:"<unknown>",
      83  		    _pam_choice2str (pamh->choice)) < 0)
      84  	{
      85  	  syslog (LOG_AUTHPRIV|LOG_ERR, "asprintf: %m");
      86  	  return;
      87  	}
      88      }
      89  
      90    errno = save_errno;
      91    if (vasprintf (&msgbuf2, fmt, args) < 0)
      92      {
      93        syslog (LOG_AUTHPRIV|LOG_ERR, "vasprintf: %m");
      94        _pam_drop (msgbuf1);
      95        return;
      96      }
      97  
      98    errno = save_errno;
      99    syslog (LOG_AUTHPRIV|priority, "%s %s",
     100  	  (msgbuf1 ? msgbuf1 : _PAM_SYSTEM_LOG_PREFIX), msgbuf2);
     101  
     102    _pam_drop (msgbuf1);
     103    _pam_drop (msgbuf2);
     104  }
     105  
     106  void
     107  pam_syslog (const pam_handle_t *pamh, int priority,
     108  	    const char *fmt, ...)
     109  {
     110    va_list args;
     111  
     112    va_start (args, fmt);
     113    pam_vsyslog (pamh, priority, fmt, args);
     114    va_end (args);
     115  }