1 /* $NetBSD: openpam_log.c,v 1.3 2017/05/06 19:50:09 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by ThinkSec AS and 9 * Network Associates Laboratories, the Security Research Division of 10 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 11 * ("CBOSS"), as part of the DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of the author may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * $OpenPAM: openpam_log.c 938 2017-04-30 21:34:42Z des $ 38 */ 39 40 #ifdef HAVE_CONFIG_H 41 # include "config.h" 42 #endif 43 44 #include <sys/cdefs.h> 45 __RCSID("$NetBSD: openpam_log.c,v 1.3 2017/05/06 19:50:09 christos Exp $"); 46 47 #include <errno.h> 48 #include <stdarg.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <syslog.h> 52 53 #include <security/pam_appl.h> 54 55 #include "openpam_impl.h" 56 #include "openpam_asprintf.h" 57 58 int openpam_debug = 0; 59 60 #if !defined(openpam_log) 61 62 /* 63 * OpenPAM extension 64 * 65 * Log a message through syslog 66 */ 67 68 void 69 openpam_log(int level, const char *fmt, ...) 70 { 71 va_list ap; 72 int priority; 73 int serrno; 74 75 switch (level) { 76 case PAM_LOG_LIBDEBUG: 77 case PAM_LOG_DEBUG: 78 if (!openpam_debug) 79 return; 80 priority = LOG_DEBUG; 81 break; 82 case PAM_LOG_VERBOSE: 83 priority = LOG_INFO; 84 break; 85 case PAM_LOG_NOTICE: 86 priority = LOG_NOTICE; 87 break; 88 case PAM_LOG_ERROR: 89 default: 90 priority = LOG_ERR; 91 break; 92 } 93 serrno = errno; 94 va_start(ap, fmt); 95 vsyslog(priority, fmt, ap); 96 va_end(ap); 97 errno = serrno; 98 } 99 100 #else 101 102 #if defined(__clang__) || __GNUC_PREREQ__(4, 5) 103 #pragma GCC diagnostic ignored "-Wformat-nonliteral" 104 #endif 105 void 106 _openpam_log(int level, const char *func, const char *fmt, ...) 107 { 108 va_list ap; 109 char *format; 110 int priority; 111 int serrno; 112 113 switch (level) { 114 case PAM_LOG_LIBDEBUG: 115 case PAM_LOG_DEBUG: 116 if (!openpam_debug) 117 return; 118 priority = LOG_DEBUG; 119 break; 120 case PAM_LOG_VERBOSE: 121 priority = LOG_INFO; 122 break; 123 case PAM_LOG_NOTICE: 124 priority = LOG_NOTICE; 125 break; 126 case PAM_LOG_ERROR: 127 default: 128 priority = LOG_ERR; 129 break; 130 } 131 serrno = errno; 132 va_start(ap, fmt); 133 if (asprintf(&format, "in %s(): %s", func, fmt) > 0) { 134 errno = serrno; 135 vsyslog(priority, format, ap); 136 FREE(format); 137 } else { 138 errno = serrno; 139 vsyslog(priority, fmt, ap); 140 } 141 va_end(ap); 142 errno = serrno; 143 } 144 145 #endif 146 147 /** 148 * The =openpam_log function logs messages using =syslog. 149 * It is primarily intended for internal use by the library and modules. 150 * 151 * The =level argument indicates the importance of the message. 152 * The following levels are defined: 153 * 154 * =PAM_LOG_LIBDEBUG: 155 * Debugging messages. 156 * For internal use only. 157 * =PAM_LOG_DEBUG: 158 * Debugging messages. 159 * These messages are normally not logged unless the global 160 * integer variable :openpam_debug is set to a non-zero 161 * value, in which case they are logged with a =syslog 162 * priority of =LOG_DEBUG. 163 * =PAM_LOG_VERBOSE: 164 * Information about the progress of the authentication 165 * process, or other non-essential messages. 166 * These messages are logged with a =syslog priority of 167 * =LOG_INFO. 168 * =PAM_LOG_NOTICE: 169 * Messages relating to non-fatal errors. 170 * These messages are logged with a =syslog priority of 171 * =LOG_NOTICE. 172 * =PAM_LOG_ERROR: 173 * Messages relating to serious errors. 174 * These messages are logged with a =syslog priority of 175 * =LOG_ERR. 176 * 177 * The remaining arguments are a =printf format string and the 178 * corresponding arguments. 179 * 180 * The =openpam_log function does not modify the value of :errno. 181 */ 182