openpam_log.c revision 348980 
1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 Dag-Erling Sm��rgrav
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 * $OpenPAM: openpam_log.c 938 2017-04-30 21:34:42Z 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#include "openpam_asprintf.h"
52
53int openpam_debug = 0;
54
55#if !defined(openpam_log)
56
57/*
58 * OpenPAM extension
59 *
60 * Log a message through syslog
61 */
62
63void
64openpam_log(int level, const char *fmt, ...)
65{
66	va_list ap;
67	int priority;
68	int serrno;
69
70	switch (level) {
71	case PAM_LOG_LIBDEBUG:
72	case PAM_LOG_DEBUG:
73		if (!openpam_debug)
74			return;
75		priority = LOG_DEBUG;
76		break;
77	case PAM_LOG_VERBOSE:
78		priority = LOG_INFO;
79		break;
80	case PAM_LOG_NOTICE:
81		priority = LOG_NOTICE;
82		break;
83	case PAM_LOG_ERROR:
84	default:
85		priority = LOG_ERR;
86		break;
87	}
88	serrno = errno;
89	va_start(ap, fmt);
90	vsyslog(priority, fmt, ap);
91	va_end(ap);
92	errno = serrno;
93}
94
95#else
96
97void
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	serrno = errno;
124	va_start(ap, fmt);
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	errno = serrno;
135}
136
137#endif
138
139/**
140 * The =openpam_log function logs messages using =syslog.
141 * It is primarily intended for internal use by the library and modules.
142 *
143 * The =level argument indicates the importance of the message.
144 * The following levels are defined:
145 *
146 *	=PAM_LOG_LIBDEBUG:
147 *		Debugging messages.
148 *		For internal use only.
149 *	=PAM_LOG_DEBUG:
150 *		Debugging messages.
151 *		These messages are normally not logged unless the global
152 *		integer variable :openpam_debug is set to a non-zero
153 *		value, in which case they are logged with a =syslog
154 *		priority of =LOG_DEBUG.
155 *	=PAM_LOG_VERBOSE:
156 *		Information about the progress of the authentication
157 *		process, or other non-essential messages.
158 *		These messages are logged with a =syslog priority of
159 *		=LOG_INFO.
160 *	=PAM_LOG_NOTICE:
161 *		Messages relating to non-fatal errors.
162 *		These messages are logged with a =syslog priority of
163 *		=LOG_NOTICE.
164 *	=PAM_LOG_ERROR:
165 *		Messages relating to serious errors.
166 *		These messages are logged with a =syslog priority of
167 *		=LOG_ERR.
168 *
169 * The remaining arguments are a =printf format string and the
170 * corresponding arguments.
171 *
172 * The =openpam_log function does not modify the value of :errno.
173 */
174