contrib/openpam/lib/openpam_log.c

   1 /*-
   2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
   3  * Copyright (c) 2004-2011 Dag-Erling Smørgrav
   4  * All rights reserved.
   5  *
   6  * This software was developed for the FreeBSD Project by ThinkSec AS and
   7  * Network Associates Laboratories, the Security Research Division of
   8  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
   9  * ("CBOSS"), as part of the DARPA CHATS research program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote
  20  *    products derived from this software without specific prior written
  21  *    permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * $Id: openpam_log.c 544 2012-03-31 22:47:15Z des $
  36  */
  37
  38 #ifdef HAVE_CONFIG_H
  39 # include "config.h"
  40 #endif
  41
  42 #include <errno.h>
  43 #include <stdarg.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <syslog.h>
  47
  48 #include <security/pam_appl.h>
  49
  50 #include "openpam_impl.h"
  51
  52 #ifdef OPENPAM_DEBUG
  53 int openpam_debug = 1;
  54 #else
  55 int openpam_debug = 0;
  56 #endif
  57
  58 #if !defined(openpam_log)
  59
  60 /*
  61  * OpenPAM extension
  62  *
  63  * Log a message through syslog
  64  */
  65
  66 void
  67 openpam_log(int level, const char *fmt, ...)
  68 {
  69         va_list ap;
  70         int priority;
  71
  72         switch (level) {
  73         case PAM_LOG_LIBDEBUG:
  74         case PAM_LOG_DEBUG:
  75                 if (!openpam_debug)
  76                         return;
  77                 priority = LOG_DEBUG;
  78                 break;
  79         case PAM_LOG_VERBOSE:
  80                 priority = LOG_INFO;
  81                 break;
  82         case PAM_LOG_NOTICE:
  83                 priority = LOG_NOTICE;
  84                 break;
  85         case PAM_LOG_ERROR:
  86         default:
  87                 priority = LOG_ERR;
  88                 break;
  89         }
  90         va_start(ap, fmt);
  91         vsyslog(priority, fmt, ap);
  92         va_end(ap);
  93 }
  94
  95 #else
  96
  97 void
  98 _openpam_log(int level, const char *func, const char *fmt, ...)
  99 {
 100         va_list ap;
 101         char *format;
 102         int priority;
 103         int serrno;
 104
 105         switch (level) {
 106         case PAM_LOG_LIBDEBUG:
 107         case PAM_LOG_DEBUG:
 108                 if (!openpam_debug)
 109                         return;
 110                 priority = LOG_DEBUG;
 111                 break;
 112         case PAM_LOG_VERBOSE:
 113                 priority = LOG_INFO;
 114                 break;
 115         case PAM_LOG_NOTICE:
 116                 priority = LOG_NOTICE;
 117                 break;
 118         case PAM_LOG_ERROR:
 119         default:
 120                 priority = LOG_ERR;
 121                 break;
 122         }
 123         va_start(ap, fmt);
 124         serrno = errno;
 125         if (asprintf(&format, "in %s(): %s", func, fmt) > 0) {
 126                 errno = serrno;
 127                 vsyslog(priority, format, ap);
 128                 FREE(format);
 129         } else {
 130                 errno = serrno;
 131                 vsyslog(priority, fmt, ap);
 132         }
 133         va_end(ap);
 134 }
 135
 136 #endif
 137
 138 /**
 139  * The =openpam_log function logs messages using =syslog.
 140  * It is primarily intended for internal use by the library and modules.
 141  *
 142  * The =level argument indicates the importance of the message.
 143  * The following levels are defined:
 144  *
 145  *      =PAM_LOG_LIBDEBUG:
 146  *              Debugging messages.
 147  *              For internal use only.
 148  *      =PAM_LOG_DEBUG:
 149  *              Debugging messages.
 150  *              These messages are normally not logged unless the global
 151  *              integer variable :openpam_debug is set to a non-zero
 152  *              value, in which case they are logged with a =syslog
 153  *              priority of =LOG_DEBUG.
 154  *      =PAM_LOG_VERBOSE:
 155  *              Information about the progress of the authentication
 156  *              process, or other non-essential messages.
 157  *              These messages are logged with a =syslog priority of
 158  *              =LOG_INFO.
 159  *      =PAM_LOG_NOTICE:
 160  *              Messages relating to non-fatal errors.
 161  *              These messages are logged with a =syslog priority of
 162  *              =LOG_NOTICE.
 163  *      =PAM_LOG_ERROR:
 164  *              Messages relating to serious errors.
 165  *              These messages are logged with a =syslog priority of
 166  *              =LOG_ERR.
 167  *
 168  * The remaining arguments are a =printf format string and the
 169  * corresponding arguments.
 170  */