743 lines
15 KiB
C
743 lines
15 KiB
C
/* $OpenBSD: pflogd.c,v 1.37 2006/10/26 13:34:47 jmc Exp $ */
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/*
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* Copyright (c) 2001 Theo de Raadt
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* Copyright (c) 2001 Can Erkin Acar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#ifdef __FreeBSD__
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#include <net/bpf.h> /* BIOCLOCK */
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <pcap-int.h>
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#include <pcap.h>
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#include <syslog.h>
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#include <signal.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <fcntl.h>
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#ifdef __FreeBSD__
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#include "pidfile.h"
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#else
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#include <util.h>
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#endif
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#include "pflogd.h"
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pcap_t *hpcap;
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static FILE *dpcap;
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int Debug = 0;
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static int snaplen = DEF_SNAPLEN;
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static int cur_snaplen = DEF_SNAPLEN;
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volatile sig_atomic_t gotsig_close, gotsig_alrm, gotsig_hup;
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char *filename = PFLOGD_LOG_FILE;
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char *interface = PFLOGD_DEFAULT_IF;
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char *filter = NULL;
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char errbuf[PCAP_ERRBUF_SIZE];
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int log_debug = 0;
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unsigned int delay = FLUSH_DELAY;
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char *copy_argv(char * const *);
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void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
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void dump_packet_nobuf(u_char *, const struct pcap_pkthdr *, const u_char *);
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int flush_buffer(FILE *);
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int init_pcap(void);
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void logmsg(int, const char *, ...);
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void purge_buffer(void);
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int reset_dump(int);
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int scan_dump(FILE *, off_t);
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int set_snaplen(int);
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void set_suspended(int);
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void sig_alrm(int);
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void sig_close(int);
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void sig_hup(int);
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void usage(void);
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static int try_reset_dump(int);
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/* buffer must always be greater than snaplen */
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static int bufpkt = 0; /* number of packets in buffer */
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static int buflen = 0; /* allocated size of buffer */
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static char *buffer = NULL; /* packet buffer */
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static char *bufpos = NULL; /* position in buffer */
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static int bufleft = 0; /* bytes left in buffer */
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/* if error, stop logging but count dropped packets */
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static int suspended = -1;
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static long packets_dropped = 0;
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void
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set_suspended(int s)
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{
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if (suspended == s)
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return;
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suspended = s;
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setproctitle("[%s] -s %d -i %s -f %s",
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suspended ? "suspended" : "running",
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cur_snaplen, interface, filename);
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}
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char *
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copy_argv(char * const *argv)
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{
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size_t len = 0, n;
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char *buf;
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if (argv == NULL)
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return (NULL);
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for (n = 0; argv[n]; n++)
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len += strlen(argv[n])+1;
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if (len == 0)
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return (NULL);
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buf = malloc(len);
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if (buf == NULL)
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return (NULL);
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strlcpy(buf, argv[0], len);
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for (n = 1; argv[n]; n++) {
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strlcat(buf, " ", len);
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strlcat(buf, argv[n], len);
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}
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return (buf);
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}
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void
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logmsg(int pri, const char *message, ...)
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{
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va_list ap;
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va_start(ap, message);
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if (log_debug) {
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vfprintf(stderr, message, ap);
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fprintf(stderr, "\n");
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} else
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vsyslog(pri, message, ap);
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va_end(ap);
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}
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#ifdef __FreeBSD__
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__dead2 void
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#else
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__dead void
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#endif
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usage(void)
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{
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fprintf(stderr, "usage: pflogd [-Dx] [-d delay] [-f filename]");
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fprintf(stderr, " [-i interface] [-s snaplen]\n");
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fprintf(stderr, " [expression]\n");
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exit(1);
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}
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void
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sig_close(int sig)
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{
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gotsig_close = 1;
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}
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void
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sig_hup(int sig)
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{
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gotsig_hup = 1;
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}
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void
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sig_alrm(int sig)
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{
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gotsig_alrm = 1;
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}
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void
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set_pcap_filter(void)
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{
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struct bpf_program bprog;
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if (pcap_compile(hpcap, &bprog, filter, PCAP_OPT_FIL, 0) < 0)
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logmsg(LOG_WARNING, "%s", pcap_geterr(hpcap));
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else {
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if (pcap_setfilter(hpcap, &bprog) < 0)
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logmsg(LOG_WARNING, "%s", pcap_geterr(hpcap));
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pcap_freecode(&bprog);
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}
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}
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int
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init_pcap(void)
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{
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hpcap = pcap_open_live(interface, snaplen, 1, PCAP_TO_MS, errbuf);
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if (hpcap == NULL) {
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logmsg(LOG_ERR, "Failed to initialize: %s", errbuf);
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return (-1);
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}
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if (pcap_datalink(hpcap) != DLT_PFLOG) {
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logmsg(LOG_ERR, "Invalid datalink type");
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pcap_close(hpcap);
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hpcap = NULL;
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return (-1);
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}
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set_pcap_filter();
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cur_snaplen = snaplen = pcap_snapshot(hpcap);
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/* lock */
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if (ioctl(pcap_fileno(hpcap), BIOCLOCK) < 0) {
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logmsg(LOG_ERR, "BIOCLOCK: %s", strerror(errno));
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return (-1);
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}
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return (0);
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}
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int
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set_snaplen(int snap)
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{
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if (priv_set_snaplen(snap))
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return (1);
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if (cur_snaplen > snap)
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purge_buffer();
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cur_snaplen = snap;
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return (0);
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}
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int
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reset_dump(int nomove)
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{
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int ret;
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for (;;) {
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ret = try_reset_dump(nomove);
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if (ret <= 0)
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break;
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}
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return (ret);
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}
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/*
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* tries to (re)open log file, nomove flag is used with -x switch
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* returns 0: success, 1: retry (log moved), -1: error
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*/
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int
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try_reset_dump(int nomove)
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{
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struct pcap_file_header hdr;
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struct stat st;
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int fd;
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FILE *fp;
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if (hpcap == NULL)
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return (-1);
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if (dpcap) {
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flush_buffer(dpcap);
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fclose(dpcap);
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dpcap = NULL;
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}
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/*
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* Basically reimplement pcap_dump_open() because it truncates
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* files and duplicates headers and such.
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*/
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fd = priv_open_log();
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if (fd < 0)
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return (-1);
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fp = fdopen(fd, "a+");
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if (fp == NULL) {
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logmsg(LOG_ERR, "Error: %s: %s", filename, strerror(errno));
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close(fd);
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return (-1);
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}
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if (fstat(fileno(fp), &st) == -1) {
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logmsg(LOG_ERR, "Error: %s: %s", filename, strerror(errno));
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fclose(fp);
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return (-1);
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}
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/* set FILE unbuffered, we do our own buffering */
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if (setvbuf(fp, NULL, _IONBF, 0)) {
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logmsg(LOG_ERR, "Failed to set output buffers");
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fclose(fp);
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return (-1);
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}
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#define TCPDUMP_MAGIC 0xa1b2c3d4
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if (st.st_size == 0) {
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if (snaplen != cur_snaplen) {
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logmsg(LOG_NOTICE, "Using snaplen %d", snaplen);
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if (set_snaplen(snaplen))
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logmsg(LOG_WARNING,
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"Failed, using old settings");
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}
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hdr.magic = TCPDUMP_MAGIC;
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hdr.version_major = PCAP_VERSION_MAJOR;
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hdr.version_minor = PCAP_VERSION_MINOR;
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hdr.thiszone = hpcap->tzoff;
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hdr.snaplen = hpcap->snapshot;
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hdr.sigfigs = 0;
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hdr.linktype = hpcap->linktype;
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if (fwrite((char *)&hdr, sizeof(hdr), 1, fp) != 1) {
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fclose(fp);
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return (-1);
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}
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} else if (scan_dump(fp, st.st_size)) {
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fclose(fp);
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if (nomove || priv_move_log()) {
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logmsg(LOG_ERR,
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"Invalid/incompatible log file, move it away");
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return (-1);
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}
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return (1);
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}
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dpcap = fp;
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set_suspended(0);
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flush_buffer(fp);
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return (0);
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}
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int
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scan_dump(FILE *fp, off_t size)
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{
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struct pcap_file_header hdr;
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#ifdef __FreeBSD__
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struct pcap_sf_pkthdr ph;
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#else
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struct pcap_pkthdr ph;
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#endif
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off_t pos;
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/*
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* Must read the file, compare the header against our new
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* options (in particular, snaplen) and adjust our options so
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* that we generate a correct file. Furthermore, check the file
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* for consistency so that we can append safely.
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*
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* XXX this may take a long time for large logs.
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*/
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(void) fseek(fp, 0L, SEEK_SET);
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if (fread((char *)&hdr, sizeof(hdr), 1, fp) != 1) {
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logmsg(LOG_ERR, "Short file header");
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return (1);
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}
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if (hdr.magic != TCPDUMP_MAGIC ||
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hdr.version_major != PCAP_VERSION_MAJOR ||
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hdr.version_minor != PCAP_VERSION_MINOR ||
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hdr.linktype != hpcap->linktype ||
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hdr.snaplen > PFLOGD_MAXSNAPLEN) {
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return (1);
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}
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pos = sizeof(hdr);
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while (!feof(fp)) {
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off_t len = fread((char *)&ph, 1, sizeof(ph), fp);
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if (len == 0)
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break;
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if (len != sizeof(ph))
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goto error;
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if (ph.caplen > hdr.snaplen || ph.caplen > PFLOGD_MAXSNAPLEN)
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goto error;
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pos += sizeof(ph) + ph.caplen;
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if (pos > size)
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goto error;
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fseek(fp, ph.caplen, SEEK_CUR);
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}
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if (pos != size)
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goto error;
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if (hdr.snaplen != cur_snaplen) {
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logmsg(LOG_WARNING,
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"Existing file has different snaplen %u, using it",
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hdr.snaplen);
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if (set_snaplen(hdr.snaplen)) {
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logmsg(LOG_WARNING,
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"Failed, using old settings, offset %llu",
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(unsigned long long) size);
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}
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}
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return (0);
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error:
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logmsg(LOG_ERR, "Corrupted log file.");
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return (1);
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}
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/* dump a packet directly to the stream, which is unbuffered */
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void
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dump_packet_nobuf(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
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{
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FILE *f = (FILE *)user;
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#ifdef __FreeBSD__
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struct pcap_sf_pkthdr sh;
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#endif
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if (suspended) {
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packets_dropped++;
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return;
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}
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#ifdef __FreeBSD__
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sh.ts.tv_sec = (bpf_int32)h->ts.tv_sec;
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sh.ts.tv_usec = (bpf_int32)h->ts.tv_usec;
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sh.caplen = h->caplen;
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sh.len = h->len;
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if (fwrite((char *)&sh, sizeof(sh), 1, f) != 1) {
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#else
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if (fwrite((char *)h, sizeof(*h), 1, f) != 1) {
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#endif
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off_t pos = ftello(f);
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|
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/* try to undo header to prevent corruption */
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#ifdef __FreeBSD__
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if (pos < sizeof(sh) ||
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ftruncate(fileno(f), pos - sizeof(sh))) {
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#else
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if (pos < sizeof(*h) ||
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ftruncate(fileno(f), pos - sizeof(*h))) {
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#endif
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logmsg(LOG_ERR, "Write failed, corrupted logfile!");
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set_suspended(1);
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gotsig_close = 1;
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return;
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}
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goto error;
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}
|
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if (fwrite((char *)sp, h->caplen, 1, f) != 1)
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goto error;
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|
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return;
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error:
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set_suspended(1);
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packets_dropped ++;
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logmsg(LOG_ERR, "Logging suspended: fwrite: %s", strerror(errno));
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}
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|
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int
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flush_buffer(FILE *f)
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{
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off_t offset;
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int len = bufpos - buffer;
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|
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if (len <= 0)
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return (0);
|
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|
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offset = ftello(f);
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if (offset == (off_t)-1) {
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set_suspended(1);
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logmsg(LOG_ERR, "Logging suspended: ftello: %s",
|
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strerror(errno));
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return (1);
|
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}
|
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|
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if (fwrite(buffer, len, 1, f) != 1) {
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set_suspended(1);
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logmsg(LOG_ERR, "Logging suspended: fwrite: %s",
|
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strerror(errno));
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ftruncate(fileno(f), offset);
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return (1);
|
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}
|
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|
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set_suspended(0);
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bufpos = buffer;
|
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bufleft = buflen;
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bufpkt = 0;
|
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|
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return (0);
|
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}
|
|
|
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void
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purge_buffer(void)
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{
|
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packets_dropped += bufpkt;
|
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|
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set_suspended(0);
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bufpos = buffer;
|
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bufleft = buflen;
|
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bufpkt = 0;
|
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}
|
|
|
|
/* append packet to the buffer, flushing if necessary */
|
|
void
|
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dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
|
|
{
|
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FILE *f = (FILE *)user;
|
|
#ifdef __FreeBSD__
|
|
struct pcap_sf_pkthdr sh;
|
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size_t len = sizeof(sh) + h->caplen;
|
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#else
|
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size_t len = sizeof(*h) + h->caplen;
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|
#endif
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|
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if (len < sizeof(*h) || h->caplen > (size_t)cur_snaplen) {
|
|
logmsg(LOG_NOTICE, "invalid size %u (%u/%u), packet dropped",
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|
len, cur_snaplen, snaplen);
|
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packets_dropped++;
|
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return;
|
|
}
|
|
|
|
if (len <= bufleft)
|
|
goto append;
|
|
|
|
if (suspended) {
|
|
packets_dropped++;
|
|
return;
|
|
}
|
|
|
|
if (flush_buffer(f)) {
|
|
packets_dropped++;
|
|
return;
|
|
}
|
|
|
|
if (len > bufleft) {
|
|
dump_packet_nobuf(user, h, sp);
|
|
return;
|
|
}
|
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|
|
append:
|
|
#ifdef __FreeBSD__
|
|
sh.ts.tv_sec = (bpf_int32)h->ts.tv_sec;
|
|
sh.ts.tv_usec = (bpf_int32)h->ts.tv_usec;
|
|
sh.caplen = h->caplen;
|
|
sh.len = h->len;
|
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|
|
memcpy(bufpos, &sh, sizeof(sh));
|
|
memcpy(bufpos + sizeof(sh), sp, h->caplen);
|
|
#else
|
|
memcpy(bufpos, h, sizeof(*h));
|
|
memcpy(bufpos + sizeof(*h), sp, h->caplen);
|
|
#endif
|
|
|
|
bufpos += len;
|
|
bufleft -= len;
|
|
bufpkt++;
|
|
|
|
return;
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
struct pcap_stat pstat;
|
|
int ch, np, Xflag = 0;
|
|
pcap_handler phandler = dump_packet;
|
|
const char *errstr = NULL;
|
|
|
|
#ifdef __FreeBSD__
|
|
/* another ?paranoid? safety measure we do not have */
|
|
#else
|
|
closefrom(STDERR_FILENO + 1);
|
|
#endif
|
|
|
|
while ((ch = getopt(argc, argv, "Dxd:f:i:s:")) != -1) {
|
|
switch (ch) {
|
|
case 'D':
|
|
Debug = 1;
|
|
break;
|
|
case 'd':
|
|
delay = strtonum(optarg, 5, 60*60, &errstr);
|
|
if (errstr)
|
|
usage();
|
|
break;
|
|
case 'f':
|
|
filename = optarg;
|
|
break;
|
|
case 'i':
|
|
interface = optarg;
|
|
break;
|
|
case 's':
|
|
snaplen = strtonum(optarg, 0, PFLOGD_MAXSNAPLEN,
|
|
&errstr);
|
|
if (snaplen <= 0)
|
|
snaplen = DEF_SNAPLEN;
|
|
if (errstr)
|
|
snaplen = PFLOGD_MAXSNAPLEN;
|
|
break;
|
|
case 'x':
|
|
Xflag++;
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
|
|
}
|
|
|
|
log_debug = Debug;
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (!Debug) {
|
|
openlog("pflogd", LOG_PID | LOG_CONS, LOG_DAEMON);
|
|
if (daemon(0, 0)) {
|
|
logmsg(LOG_WARNING, "Failed to become daemon: %s",
|
|
strerror(errno));
|
|
}
|
|
pidfile(NULL);
|
|
}
|
|
|
|
tzset();
|
|
(void)umask(S_IRWXG | S_IRWXO);
|
|
|
|
/* filter will be used by the privileged process */
|
|
if (argc) {
|
|
filter = copy_argv(argv);
|
|
if (filter == NULL)
|
|
logmsg(LOG_NOTICE, "Failed to form filter expression");
|
|
}
|
|
|
|
/* initialize pcap before dropping privileges */
|
|
if (init_pcap()) {
|
|
logmsg(LOG_ERR, "Exiting, init failure");
|
|
exit(1);
|
|
}
|
|
|
|
/* Privilege separation begins here */
|
|
if (priv_init()) {
|
|
logmsg(LOG_ERR, "unable to privsep");
|
|
exit(1);
|
|
}
|
|
|
|
setproctitle("[initializing]");
|
|
/* Process is now unprivileged and inside a chroot */
|
|
signal(SIGTERM, sig_close);
|
|
signal(SIGINT, sig_close);
|
|
signal(SIGQUIT, sig_close);
|
|
signal(SIGALRM, sig_alrm);
|
|
signal(SIGHUP, sig_hup);
|
|
alarm(delay);
|
|
|
|
buffer = malloc(PFLOGD_BUFSIZE);
|
|
|
|
if (buffer == NULL) {
|
|
logmsg(LOG_WARNING, "Failed to allocate output buffer");
|
|
phandler = dump_packet_nobuf;
|
|
} else {
|
|
bufleft = buflen = PFLOGD_BUFSIZE;
|
|
bufpos = buffer;
|
|
bufpkt = 0;
|
|
}
|
|
|
|
if (reset_dump(Xflag) < 0) {
|
|
if (Xflag)
|
|
return (1);
|
|
|
|
logmsg(LOG_ERR, "Logging suspended: open error");
|
|
set_suspended(1);
|
|
} else if (Xflag)
|
|
return (0);
|
|
|
|
while (1) {
|
|
np = pcap_dispatch(hpcap, PCAP_NUM_PKTS,
|
|
phandler, (u_char *)dpcap);
|
|
if (np < 0) {
|
|
#ifdef __FreeBSD__
|
|
if (errno == ENXIO) {
|
|
logmsg(LOG_ERR,
|
|
"Device not/no longer configured");
|
|
break;
|
|
}
|
|
#endif
|
|
logmsg(LOG_NOTICE, "%s", pcap_geterr(hpcap));
|
|
}
|
|
|
|
if (gotsig_close)
|
|
break;
|
|
if (gotsig_hup) {
|
|
if (reset_dump(0)) {
|
|
logmsg(LOG_ERR,
|
|
"Logging suspended: open error");
|
|
set_suspended(1);
|
|
}
|
|
gotsig_hup = 0;
|
|
}
|
|
|
|
if (gotsig_alrm) {
|
|
if (dpcap)
|
|
flush_buffer(dpcap);
|
|
else
|
|
gotsig_hup = 1;
|
|
gotsig_alrm = 0;
|
|
alarm(delay);
|
|
}
|
|
}
|
|
|
|
logmsg(LOG_NOTICE, "Exiting");
|
|
if (dpcap) {
|
|
flush_buffer(dpcap);
|
|
fclose(dpcap);
|
|
}
|
|
purge_buffer();
|
|
|
|
if (pcap_stats(hpcap, &pstat) < 0)
|
|
logmsg(LOG_WARNING, "Reading stats: %s", pcap_geterr(hpcap));
|
|
else
|
|
logmsg(LOG_NOTICE,
|
|
"%u packets received, %u/%u dropped (kernel/pflogd)",
|
|
pstat.ps_recv, pstat.ps_drop, packets_dropped);
|
|
|
|
pcap_close(hpcap);
|
|
if (!Debug)
|
|
closelog();
|
|
return (0);
|
|
}
|