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
36#ifdef HAVE_CONFIG_H
37# include "config.h"
38#endif
39
40#include <errno.h>
41#include <stdarg.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <syslog.h>
45
46#include <security/pam_appl.h>
47
48#include "openpam_impl.h"
49#include "openpam_asprintf.h"
50
51int openpam_debug = 0;
52
53#if !defined(openpam_log)
54
55/*
56 * OpenPAM extension
57 *
58 * Log a message through syslog
59 */
60
61void
62openpam_log(int level, const char *fmt, ...)
63{
64	va_list ap;
65	int priority;
66	int serrno;
67
68	switch (level) {
69	case PAM_LOG_LIBDEBUG:
70	case PAM_LOG_DEBUG:
71		if (!openpam_debug)
72			return;
73		priority = LOG_DEBUG;
74		break;
75	case PAM_LOG_VERBOSE:
76		priority = LOG_INFO;
77		break;
78	case PAM_LOG_NOTICE:
79		priority = LOG_NOTICE;
80		break;
81	case PAM_LOG_ERROR:
82	default:
83		priority = LOG_ERR;
84		break;
85	}
86	serrno = errno;
87	va_start(ap, fmt);
88	vsyslog(priority, fmt, ap);
89	va_end(ap);
90	errno = serrno;
91}
92
93#else
94
95void
96_openpam_log(int level, const char *func, const char *fmt, ...)
97{
98	va_list ap;
99	char *format;
100	int priority;
101	int serrno;
102
103	switch (level) {
104	case PAM_LOG_LIBDEBUG:
105	case PAM_LOG_DEBUG:
106		if (!openpam_debug)
107			return;
108		priority = LOG_DEBUG;
109		break;
110	case PAM_LOG_VERBOSE:
111		priority = LOG_INFO;
112		break;
113	case PAM_LOG_NOTICE:
114		priority = LOG_NOTICE;
115		break;
116	case PAM_LOG_ERROR:
117	default:
118		priority = LOG_ERR;
119		break;
120	}
121	serrno = errno;
122	va_start(ap, fmt);
123	if (asprintf(&format, "in %s(): %s", func, fmt) > 0) {
124		errno = serrno;
125		vsyslog(priority, format, ap);
126		FREE(format);
127	} else {
128		errno = serrno;
129		vsyslog(priority, fmt, ap);
130	}
131	va_end(ap);
132	errno = serrno;
133}
134
135#endif
136
137/**
138 * The =openpam_log function logs messages using =syslog.
139 * It is primarily intended for internal use by the library and modules.
140 *
141 * The =level argument indicates the importance of the message.
142 * The following levels are defined:
143 *
144 *	=PAM_LOG_LIBDEBUG:
145 *		Debugging messages.
146 *		For internal use only.
147 *	=PAM_LOG_DEBUG:
148 *		Debugging messages.
149 *		These messages are normally not logged unless the global
150 *		integer variable :openpam_debug is set to a non-zero
151 *		value, in which case they are logged with a =syslog
152 *		priority of =LOG_DEBUG.
153 *	=PAM_LOG_VERBOSE:
154 *		Information about the progress of the authentication
155 *		process, or other non-essential messages.
156 *		These messages are logged with a =syslog priority of
157 *		=LOG_INFO.
158 *	=PAM_LOG_NOTICE:
159 *		Messages relating to non-fatal errors.
160 *		These messages are logged with a =syslog priority of
161 *		=LOG_NOTICE.
162 *	=PAM_LOG_ERROR:
163 *		Messages relating to serious errors.
164 *		These messages are logged with a =syslog priority of
165 *		=LOG_ERR.
166 *
167 * The remaining arguments are a =printf format string and the
168 * corresponding arguments.
169 *
170 * The =openpam_log function does not modify the value of :errno.
171 */
172