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sniff2ban.c
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sniff2ban.c
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/*
* sniff2ban.c: Scan for intrusions
*
* Copyright (C) 2009-2024 Nigel Horne, njh@bandsman.co.uk
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* This program does not need to be thread safe
*
* TODO: more error checking
* TODO: Handle TCP packets out of order and/or fragmented (libpcap may do
* this already) and sequence numbers
* TODO: Consider netfilter/ULOG on Linux
* TODO: Support UDP
* TODO: Connect to spamassassin (probably not needed if you use Sanesecurity)
* FIXME: On Solaris10 I see "too many open files" errors.
* TODO: Handle background/foreground by enabling/disabling promiscuous mode
* TODO: --enable-http-scanning should be a runtime not a compile time option
* TODO: condsider libipq (iptables-dev on Debian)
* TODO: use INSTREAM when talking to clamd, and stop creating the temp files
* TODO: to avoid clamd timeout and dropping the IDSESSION, send PING from time
* to time
* TODO: SMTP_SCANNING - look for 'possible SMTP attack'
*
* Version 0.07 21/12/09
* Version 0.10 12/2/10
*/
/* RFC791 = IP */
/* RFC793 = TCP */
#if HAVE_CONFIG_H
#include "config.h"
#endif
/* no LIBPCAP (raw mode) only works on Linux */
#if !defined(C_LINUX) && !defined(HAVE_LIBPCAP)
#error You must install libpcap
#endif
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <stdint.h>
#include <unistd.h>
#include <signal.h>
#include <pwd.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <net/if.h>
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_IP_COMPAT_H
#include <netinet/ip_compat.h>
#endif
#ifdef HAVE_NETINET_IN_SYSTM_H
#include <netinet/in_systm.h>
#endif
#ifdef HAVE_NETINET_IF_ETHER_H
#include <netinet/if_ether.h>
#endif
#ifdef HAVE_NET_IF_ETHER_H
#include <net/if_ether.h>
#endif
#ifdef HAVE_SYS_ETHERNET_H
#include <sys/ethernet.h>
#endif
#ifdef HAVE_NET_ETHERNET_H
#include <net/ethernet.h>
#endif
#include <netinet/ip.h>
#include <netinet/tcp.h>
#ifdef HAVE_LIBPCAP
#include <pcap.h>
#endif
#include <string.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/un.h>
#include <fcntl.h>
#include <time.h>
#include <syslog.h>
#include <getopt.h>
#include <ctype.h>
#ifdef HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif
#ifdef HAVE_ARPA_NAMESER_COMPAT_H
#include <arpa/nameser_compat.h>
#endif
#ifdef HAVE_RESOLV_H
#include <resolv.h>
#endif
#include <assert.h>
#include <dirent.h>
#include "hashtable.h"
#define MAXBYTES 2048
#ifdef SITES_ENABLED_DIR
#define MINSCANSIZE 8
#else
#define MINSCANSIZE 64
#endif
#define MAXSCANSIZE 1024L*1024L
#define TIMEALIVE 60 /*
* After this number of seconds assume the
* connection has closed
*/
#define MIN_SCAN_OFTEN_SECS 5 /* Do not scan a file more often than this */
#if(defined(AUTH_LOG) || defined(DOVECOT_LOG))
#define MAX_FAILURES 3 /* Any more than this and you can't get in */
#endif
union ip_addr {
in_addr_t i;
unsigned char c[4];
};
struct key {
union ip_addr saddr;
union ip_addr daddr;
in_port_t sport;
in_port_t dport;
};
struct value {
char *filename;
off_t nbytes;
time_t lastscanned;
time_t lastwritten;
unsigned int infected:1;
unsigned int forcescan:1;
FILE *fp;
};
static struct whitelist {
union ip_addr addr;
uint32_t mask;
struct whitelist *next;
} *whitelist, *whitelist_tail;
static struct sacredlist {
const char *program;
struct sacredlist *next;
} *sacredlist, *sacredlist_tail;
#ifdef SITES_ENABLED_DIR
static struct apachehosts {
const char *name;
struct apachehosts *next;
} *apachehosts;
#endif
#ifdef CLAMD_CONF
static const char *sockname; /* talk to clamd: pathname or host */
static in_port_t sockport; /* talk to clamd: if host */
static int clamd_socket;
#endif
#ifdef SITES_ENABLED_DIR
/*
* This blocks legitimate access to services such as phpmyadmin and
* crossdomain.xml, but you can get around that by whitelisting the client
*/
static const char *http_probes[] = {
"GET //mysql/",
"GET /mysql//scripts/setup.php",
"GET /admin/mysql/scripts/setup.php",
"GET /user/soapCaller.bs",
"GET /w00tw00t.at.",
"GET /test.w00t:)",
/*"GET /w00tw00t.at.ISC.SANS.DFind:)",*/
/*"GET /w00tw00t.at.blackhats.romanian.anti-sec:)",*/
"GET /pma//scripts/setup.php",
"GET /pma/scripts/setup.php",
"HEAD /pma/scripts/setup.php",
"GET //zencart//install.txt",
"GET /horde//README", /* Mambo */
"GET /cube/README", /* Morfeus */
"GET /roundcubemail/README", /* Morfeus */
"GET /round/README", /* Morfeus */
"GET //phpMyAdmin//scripts/setup.php",
"GET /phpmyadmin/scripts/setup.php", /* Toata dragostea mea pentru iEdi */
"GET //phpmyadmin/",
"GET /phpmyadmin//scripts/setup.php",
"GET /phpmyadmin/scripts/setup.php",
"GET //phpmyadmin/config/config.inc.php?p=phpinfo();",
"GET /phpMyAdmin-", /* ZmEu */
"GET //phpMyAdmin/",
"GET /phpMyAdmin/",
"GET /phpMyAdmin-2.10.0.0/scripts/setup.php",
"GET /admin",
"GET /e107_files/e107.css", /* Toata dragostea mea pentru diavola */
"GET /controls/ps3-dbadmin/scripts/setup.php", /* Toata dragostea mea pentru iEdi */
"GET /thisdoesnotexistahaha.php",
"GET //themes/NukeNews/",
"GET /adxmlrpc.php",
"GET /cart/install.txt", /* Toata dragostea mea pentru diavola */
/* "GET //pma/config/config.inc.php?p=phpinfo();", */
"GET //pma/", /* Made by ZmEu @ WhiteHat Team - www.whitehat.ro */
"GET /scripts/setup.php", /* ZmEu */
"GET //sql/", /* ZmEu */
"GET //PHPMYADMIN/", /* ZmEu */
"GET //dbadmin/config/config.inc.php?p=phpinfo();",
"GET //horde/util/barcode.php?type=../../../../../../../../../../../../../etc/passwd",
"GET //web-console/css//dtree.css",
"GET /webdav/test",
"GET /webdav/index.html",
"GET /crossdomain.xml",
"GET //phpldapadmin/htdocs/",
"GET //PMA2005/",
"GET /jmx-console/", /* FHScan Core 1.1 */
"GET /vicidial/welcome.php",
"GET /calendar/AUTHORS",
"GET /appConf.htm",
"HEAD /manager/status",
"HEAD /manager/html",
"GET /appserv/main.php",
"GET /3rdparty/phpMyAdmin",
"GET /_phpMyAdmin/scripts/setup.php",
"GET /sqladmin/scripts/setup.php",
"GET /sqlmanager/scripts/setup.php",
"GET /sql/scripts/setup.php",
"GET /SQL/scripts/setup.php",
"GET /sqlweb/scripts/setup.php",
"GET /xampp/phpmyadmin/scripts/setup.php",
"GET /admin/index.php",
"GET /phpMyAdmin-2/index.php",
"GET //phpMyAdmin-2/",
"GET /translators.html",
"GET //typo3/phpmyadmin/index.php",
"GET /xmlrpc.php HTTP/1.1",
"GET /wp-login.php HTTP/1.1",
"POST /cgi-bin/php?%2D%64+%61%6C%6C%6F%77%5F%75%72%6C%5F%69%6E%63%6C%75%64%65%3D%6F%6E+%2D%64+%73%61%66%65%5F%6D%6F%64%65%3D%6F%66%66+%2D%64+%73%75%68%6F%73%69%6E%2E%73%69%6D%75%6C%61%74%69%6F%6E%3D%6F",
"GET /phppath/php",
"GET //administrator/components/",
"GET /administrator/index.php",
"GET /myadmin/scripts/setup.php",
"GET /HNAP1/",
"GET /phpTest/zologize/axa.php",
"GET /cgi-bin/rtpd.cgi?/bin/busybox",
"GET /muieblackcat",
"GET /admin/fckeditor/editor/filemanager/browser/default/connectors/test.html",
"GET /bxbx/bxb/bx.php",
"GET /xpxp/xpx/xp.php",
"GET /zbzb/zbz/zb.php",
"GET /qpqp/qpq/qp.php",
"GET /juju/juj/ju.php",
"HEAD /fckeditor/editor/filemanager/browser/default/connectors/aspx/connector.aspx",
"POST http://vlad-tepes.bofh.it/freenode-proxy-checker.txt",
"GET /tmUnblock.cgi",
"POST http://check.proxyradar.com",
"GET /server-status?HTTP_POST=%\"%6346#%#/ˠ%\"#423|;&HTTP_CGI_GET=GRESYYK\"K&J\"#L523D2G23H23", /* apache 0day by @hxmonsegur */
"GET /MyAdmin/scripts/setup.php",
"GET /PMA2011/scripts/setup.php",
"GET /PMA2012/scripts/setup.php",
"GET /engine/log.txt",
"GET /stalker_portal/server/adm/users/users-list-json",
"GET /_asterisk/",
"GET /login.cgi/cli=aa",
"masscan/",
"GET /plugins/weathermap/configs/conn.php?",
"GET /invoker/readonly",
"GET /cools.php?id=wget",
"GET /aastra/aastra.cfg",
"GET /dana-na/jam/querymanifest.cgi?component=preConfiguration",
"POST /dns-query",
"POST /editBlackAndWhiteList",
"GET /?XDEBUG_SESSION_START=phpstorm",
"GET ../../",
"POST /api/jsonws/invoke",
"GET /?a=fetch&content=<php>die(@md5(HelloThinkCMF))</php>",
"POST /cgi-bin/mainfunction.cgi",
"GET /shell?cd+/tmp;rm+-rf+*;wget",
"/${jndi:ldap://",
"GET /wp-includes/id3/license.txt/wp/wp-includes/wlwmanifest.xml",
"GET /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php",
/* OpenWRT hack */
"GET /cgi-bin/luci/;stok=/locale?form=country&operation=write&country",
"..%252Fetc%252Fpasswd",
"GET /forum/viewforum.php?f=6&f=..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252Fetc%252Fpasswd",
NULL
};
static size_t *http_probelens;
#endif
int sniff_insert(struct hashtable *h, struct key *k, struct value *v);
struct value *sniff_search(struct hashtable *h, struct key *k);
struct value *sniff_remove(struct hashtable *h, struct key *k);
DEFINE_HASHTABLE_INSERT(sniff_insert, struct key, struct value)
DEFINE_HASHTABLE_SEARCH(sniff_search, struct key, struct value)
DEFINE_HASHTABLE_REMOVE(sniff_remove, struct key, struct value)
static int add_to_whitelist(const char *address);
static int add_ip_to_whitelist(const char *address);
static int add_to_sacred(const char *program);
static unsigned int iphash(const void *p);
static int hasheq(const void *p1, const void *p2);
static int scan(struct value *v, union ip_addr saddr, union ip_addr daddr, in_port_t dport);
static void kill_route(union ip_addr addr_host_order);
static void allow_route(union ip_addr addr_host_order);
static void allow_route(union ip_addr addr);
static void onexit(void);
#ifdef CLAMD_CONF
static int clamscan(const char *file, char *virusname, const char *socketpath, in_port_t port);
static int unix_socket(const char *socket_name);
static int ip_socket(const char *hostname, in_port_t portnum);
static int recv_data(int s, int tsecs, char *buf, size_t len);
static void close_clamd_socket(void);
static int send_data(int fd, const void *buff, unsigned int count, const char *socketpath);
#endif
static void hashtable_iterate(struct hashtable *h, int scanthem, int foreceunlink);
static void destroy(struct hashtable *h, struct key *k, struct value *v);
static const char *ipv4tostr(char *s, union ip_addr addr_host_order);
#ifdef CLAMD_CONF
static int getsocknamefromclamdconf(char *buf);
#else
#define getsocknamefromclamdconf(buf) (0)
#endif
static int iswhitelisted(const union ip_addr *host_order_addr);
#ifdef SITES_ENABLED_DIR
static void setup_apache_hosts(void);
#endif
#ifdef SITES_ENABLED_DIR
static in_port_t http_port;
#endif
static struct hashtable *hashtable;
static int droproutes;
static int stopping;
static int verbose = 0;
static int killprograms;
static int timealive = TIMEALIVE;
static const char *tmpdir;
#if(defined(AUTH_LOG) || defined(DOVECOT_LOG))
static int max_failures = MAX_FAILURES;
#endif
int
main(int argc, char *const *argv)
{
#ifndef IPPROTO_TCP
const struct protoent *protoent;
int tcp;
#endif
const char *interface, *pidfile = NULL;
const struct passwd *passwd;
struct key *kprealloc = NULL;
int dont_drop_self = 0;
int dont_scan_white_listed = 0;
#ifdef SITES_ENABLED_DIR
int i;
const char **probe;
#endif
#ifdef HAVE_LIBPCAP
bpf_u_int32 deviceaddr, devicemask;
pcap_t *pcap;
struct bpf_program fp;
char errbuf[PCAP_ERRBUF_SIZE];
#else
int sock;
short flags;
const struct sockaddr_in *etheraddr;
struct ifreq ifreq;
struct sockaddr_in sin;
#endif
char buf[BUFSIZ];
for(;;) {
int opt_index = 0;
const char *args = "dhkp:sS:t:T:vVw:W";
static struct option long_options[] = {
{
"drop-routes", 0, NULL, 'd'
}, {
"dont-drop-self", 0, NULL, 's'
}, {
"help", 0, NULL, 'h'
}, {
"kill-programs", 0, NULL, 'k'
}, {
#if(defined(AUTH_LOG) || defined(DOVECOT_LOG))
"maximum-failures", 0, NULL, 'm'
}, {
#endif
"pidfile", 1, NULL, 'p'
}, {
"sacred-program", 1, NULL, 'S'
}, {
"time-alive", 1, NULL, 't'
}, {
"tmpdir", 1, NULL, 'T'
}, {
"verbose", 0, NULL, 'v'
}, {
"version", 0, NULL, 'V'
}, {
"white-list", 1, NULL, 'w'
}, {
"dont-scan-white-listed", 0, NULL, 'W'
}, {
NULL, 0, NULL, '\0'
}
};
int ret = getopt_long(argc, argv, args, long_options, &opt_index);
if(ret == -1)
break;
else if(ret == 0)
continue;
switch(ret) {
case 'd':
droproutes++;
break;
case 'p':
pidfile = optarg;
break;
case 'k':
killprograms++;
break;
#if(defined(AUTH_LOG) || defined(DOVECOT_LOG))
case 'm':
max_failures = atoi(optarg);
if(max_failures < 0) {
fprintf(stderr, "%s: -m argument can't be negative\n",
argv[0]);
return 1;
}
#endif
break;
case 's':
/*
* Useful when using sniff2ban to monitor
* outgoing emails where we want to see what's
* going on, but don't want to block all traffic
*/
dont_drop_self++;
break;
case 'T':
tmpdir = optarg;
break;
case 't':
timealive = atoi(optarg);
if(timealive < 0) {
fprintf(stderr, "%s: -t argument can't be negative\n",
argv[0]);
return 1;
}
break;
case 'v':
verbose++;
break;
case 'V':
puts(PACKAGE_STRING);
return 0;
case 'w':
if(!add_to_whitelist(optarg)) {
fprintf(stderr, "%s: Failed to whitelist %s\n",
argv[0], optarg);
return 1;
}
break;
case 'W':
dont_scan_white_listed++;
break;
case 'S':
if(!add_to_sacred(optarg)) {
fprintf(stderr, "%s: Failed to sacred list %s\n",
argv[0], optarg);
return 1;
}
break;
default:
fprintf(stderr, "Usage: %s [-d] [-k] [-s] [-T dir] [-t secs] [-v] [-w IP address] [ -V ] [ -W ] [-p pidfile] [-S sacred_program ] [ socket ] [ interface ]\n", argv[0]);
return 1;
}
}
/*
* Sanity checks
*/
if(!droproutes) {
if(whitelist) {
fputs("You have specified addresses to whitelist, but not to drop routes\n", stderr);
return 1;
}
if(dont_drop_self) {
fputs("You have specified the -s flag, but not the -d flag\n", stderr);
return 1;
}
}
if(sacredlist_tail && !killprograms) {
fputs("You have specified a sacred program list, but not requested to kill programs\n", stderr);
return 1;
}
#ifdef HAVE_LIBPCAP
if(optind == argc) {
interface = pcap_lookupdev(errbuf);
if(verbose && interface)
printf("%s: Monitoring %s for malware\n", argv[0], interface);
#ifdef CLAMD_CONF
if(!getsocknamefromclamdconf(buf)) {
/*
* No means to talk to clamd or interface given and
* there is no clamd.conf to work it out, therefore
* the socket must be given
*/
fputs("Couldn't determine how to talk to clamd\n", stderr);
fprintf(stderr, "Usage: %s [-d] [-k] [-s] [-t secs] [-v] [-w IP address] [ -W ] [-S sacred_program ] socket [ interface ]\n", argv[0]);
return 1;
}
if(verbose >= 2)
printf("%s: Using %s as the ClamAV socket\n", argv[0], buf);
sockname = buf;
#endif
} else if(optind == (argc - 1)) {
interface = pcap_lookupdev(errbuf);
if(verbose && interface)
printf("%s: Monitoring %s for malware\n", argv[0], interface);
sockname = argv[optind++];
} else {
if(optind != (argc - 2)) {
if(!getsocknamefromclamdconf(buf)) {
/*
* No means to talk to clamd or interface given
* and there is no clamd.conf to work it out,
* therefore the socket must be given
*/
fputs("Couldn't determine how to talk to clamd\n", stderr);
fprintf(stderr, "Usage: %s [-d] [-k] [-s] [-t secs] [-v] [-w IP address] [ -W ] [-S sacred_program ] socket [ interface ]\n", argv[0]);
return 1;
}
if(verbose >= 2)
printf("%s: Using %s as the ClamAV socket\n", argv[0], buf);
sockname = buf;
} else
sockname = argv[optind++];
interface = NULL;
}
#elif defined(CLAMD_CONF)
if(optind != (argc - 2)) {
if(!getsocknamefromclamdconf(buf)) {
/* No means to talk to clamd or interface given */
fputs("Couldn't determine how to talk to clamd\n", stderr);
fprintf(stderr, "Usage: %s [-d] [-k] [-s] [-t secs] [-v] [-w IP address] [ -W ] [-S sacred_program ] socket [ interface ]\n", argv[0]);
return 1;
}
if(verbose >= 2)
printf("Using %s as the ClamAV socket\n", buf);
sockname = buf;
} else
sockname = argv[optind++];
if(sockname && (sockname[0] != '/')) {
char *ptr = strchr(sockname, ':');
if(ptr == NULL) {
fprintf(stderr, "%s: No port number given to talk to clamd in %s\n",
argv[0], sockname);
return 1;
}
*ptr++ = '\0';
if(!isdigit(*ptr)) {
fprintf(stderr, "%s: Invalid port number given '%s'\n",
argv[0], ptr);
return 1;
}
sockport = atoi(ptr);
if(sockport <= 0) {
fprintf(stderr, "%s: Invalid port number given '%s'\n",
argv[0], ptr);
return 1;
}
}
/* TODO: validate sockname by sending PING to clamd */
#endif
#ifdef HAVE_LIBPCAP
if(argv[optind])
interface = argv[optind];
if(interface == NULL) {
fputs("Couldn't determine a default device\n", stderr);
fprintf(stderr, "Usage: %s [-d] [-k] [-s] [-t secs] [-v] [-w IP address] [ -W ] [-S sacred_program ] [ socket ] interface\n", argv[0]);
return 1;
}
/* Open the device in promiscuous mode */
pcap = pcap_open_live(interface, BUFSIZ, 1, 1000, errbuf);
if(pcap == NULL) {
fprintf(stderr, "%s: Couldn't open device %s: %s\n",
argv[0], interface, errbuf);
return 2;
}
#else
interface = argv[optind];
if(interface == NULL) {
fputs("No Interface given\n", stderr);
fprintf(stderr, "Usage: %s [-d] [-k] [-s] [-t secs] [-v] [-w IP address] [ -W ] [-S sacred_program ] [ socket ] interface\n", argv[0]);
return 1;
}
/*
* Don't use ETH_P_IP so that we can catch FTP transfers
*/
if((sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
perror("socket");
return errno;
}
strncpy(ifreq.ifr_name, interface, IFNAMSIZ);
ioctl(sock, SIOCGIFFLAGS, &ifreq);
flags = ifreq.ifr_flags;
if(!(flags&IFF_PROMISC)) {
ifreq.ifr_flags |= IFF_PROMISC;
if(ioctl(sock, SIOCSIFFLAGS, &ifreq) < 0) {
perror("ioctl");
return errno;
}
}
#endif
if(dont_scan_white_listed && (!dont_drop_self) && (whitelist_tail == NULL))
puts("Warning: -W given, but not -w which is probably not what you wanted");
#ifdef SITES_ENABLED_DIR
if(verbose)
printf("%s: Will scan HTTP messages for sites listed in %s\n",
argv[0], SITES_ENABLED_DIR);
setup_apache_hosts();
#else
if(verbose >= 2)
printf("%s: Will not scan HTTP messages\n", argv[0]);
#endif
#ifdef AUTH_LOG
if(verbose)
printf("%s: Will scan SSH failures listed in %s\n",
argv[0], AUTH_LOG);
#endif
#ifdef DOVECOT_LOG
if(verbose)
printf("%s: Will scan Dovecot failures listed in %s\n",
argv[0], DOVECOT_LOG);
#endif
passwd = getpwnam("clamav");
if(!droproutes) {
if(passwd) {
if(setgid(passwd->pw_gid) < 0)
perror("setgid");
if(setuid(passwd->pw_uid) < 0)
perror("setuid");
} else
fputs("No ClamAV user - running as root is dangerous\n", stderr);
}
endpwent();
umask(077);
#ifdef HAVE_LIBPCAP
if(pcap_lookupnet(interface, &deviceaddr, &devicemask, errbuf) == -1) {
fprintf(stderr, "%s: Couldn't get address of device %s\n",
argv[0], interface);
return 3;
}
pcap_set_datalink(pcap, DLT_EN10MB);
#else
ioctl(sock, SIOCGIFADDR, &ifreq);
etheraddr = (const struct sockaddr_in *)&ifreq.ifr_addr;
memcpy(&sin, etheraddr, sizeof(struct sockaddr_in));
if(bind(sock, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) < 0)
perror(inet_ntoa(sin.sin_addr));
#endif
if(dont_drop_self) {
if(whitelist == NULL)
whitelist_tail = whitelist = malloc(sizeof(struct whitelist));
else {
whitelist_tail->next = malloc(sizeof(struct whitelist));
whitelist_tail = whitelist_tail->next;
}
#ifdef HAVE_LIBPCAP
whitelist_tail->addr.i = deviceaddr;
pcap_setdirection(pcap, PCAP_D_IN);
if(verbose >= 2) {
struct in_addr addr;
union ip_addr mask;
addr.s_addr = deviceaddr;
mask.i = devicemask;
printf("%s: Not checking self (%s/%d.%d.%d.%d) for malware\n",
argv[0], inet_ntoa(addr),
mask.c[0], mask.c[1], mask.c[2], mask.c[3]);
}
whitelist_tail->mask = ntohl(devicemask);
#else
whitelist_tail->addr.i = etheraddr->sin_addr.s_addr;
whitelist_tail->mask = 0xFFFFFFFF;
#endif
whitelist_tail->next = NULL;
}
#ifndef IPPROTO_TCP
/* If IPPROTO_TCP isn't defined try /etc/protocols */
protoent = getprotoent("tcp");
if(protoent == NULL) {
fprintf(stderr, "%s: Can't work out the TCP protocol number\n",
argv[0]);
#ifdef HAVE_LIBPCAP
pcap_close(pcap);
#endif
return 3;
}
tcp = protoent->p_proto;
endprotoent();
#endif
#ifdef SITES_ENABLED_DIR
i = 0;
for(probe = http_probes; *probe; probe++)
i++;
http_probelens = malloc(i * sizeof(size_t));
if(http_probelens == NULL) {
fprintf(stderr, "%s: Out of memory\n", argv[0]);
#ifdef HAVE_LIBPCAP
pcap_close(pcap);
#endif
return 4;
}
i = 0;
for(probe = http_probes; *probe; probe++)
http_probelens[i++] = strlen(*probe);
#endif
#ifdef HAVE_LIBPCAP
if(pcap_compile(pcap, &fp, "tcp", 0, deviceaddr) >= 0) {
if(pcap_setfilter(pcap, &fp) < 0)
fprintf(stderr, "%s: Error setting filter \"tcp\"\n",
argv[0]);
} else
fprintf(stderr, "%s: Error with pcap_compile \"tcp\"\n",
argv[0]);
#endif
if(!verbose)
switch(fork()) {
case -1:
perror("fork");
return errno;
case 0:
/*close(0);
close(1);
close(2);
open("/dev/null", O_RDONLY);
open("/dev/null", O_WRONLY);
dup(1);*/
break;
default:
return 0;
}
if(pidfile) {
/*
* Add a pidfile, useful for monit(1) and puppet(1)
* to restart if sniff2ban dies
*/
FILE *p = fopen(pidfile, "w");
if(p == NULL) {
perror(pidfile);
return errno;
}
fprintf(p, "%d\n", getpid());
fclose(p);
}
if(tmpdir == NULL) {
if(getenv("TMPDIR"))
tmpdir = getenv("TMPDIR");
else if(P_tmpdir)
tmpdir = P_tmpdir;
else
tmpdir = "/tmp";
}
openlog(argv[0], LOG_CONS|LOG_PID, LOG_DAEMON);
hashtable = create_hashtable(200, iphash, hasheq);
#ifdef HAVE_SIG_T
signal(SIGTERM, (sig_t)onexit);
signal(SIGINT, (sig_t)onexit);
#elif defined(HAVE_SIGHANDLER_T)
signal(SIGTERM, (__sighandler_t)onexit);
signal(SIGINT, (__sighandler_t)onexit);
#else
signal(SIGTERM, onexit);
signal(SIGINT, onexit);
#endif
atexit(onexit);
#ifdef SIGPIPE
signal(SIGPIPE, SIG_IGN);
#endif
while(!stopping) {
ssize_t nbytes, payloadlength;
uint16_t sport, dport;
const struct ether_header *ethhdr;
#ifdef HAVE_STRUCT_IPHDR
const struct iphdr *iphdr;
#else
const struct ip *iphdr;
#endif
const struct tcphdr *tcphdr;
const unsigned char *ptr;
struct key *k;
struct value *v;
union ip_addr source_addr, dest_addr;
#ifdef HAVE_LIBPCAP
const u_char *buffer;
struct pcap_pkthdr header;
#else
unsigned char buffer[MAXBYTES];
#endif
#ifdef HAVE_LIBPCAP
buffer = pcap_next(pcap, &header);
if(buffer == NULL) {
/*fprintf(stderr, "%s: Error reading data from %s\n",
argv[0], interface);
hashtable_iterate(hashtable, 0, 1);
pcap_close(pcap);
return 1;*/
hashtable_iterate(hashtable, 1, 0);
continue;
}
nbytes = header.len;
#else
nbytes = recvfrom(sock, buffer, sizeof(buffer), 0, NULL, NULL);
if(nbytes < 0) {
perror("recvfrom");
hashtable_iterate(hashtable, 0, 1);
close(sock);
return errno;
}
#endif
if(nbytes < (ssize_t)sizeof(struct ether_header)) {
puts("too small");
continue;
}
ethhdr = (const struct ether_header *)buffer;
#ifdef ETHERTYPE_IP
if(ntohs(ethhdr->ether_type) != ETHERTYPE_IP) {
/*printf("ether proto %d\n", ntohs(ethhdr->ether_type));*/
continue;
}
#else
if(ntohs(ethhdr->ether_type) != ETH_P_IP) {
/*printf("ether proto %d\n", ntohs(ethhdr->ether_type));*/
continue;
}
#endif
#ifdef HAVE_STRUCT_IPHDR
iphdr = (const struct iphdr *)&buffer[sizeof(struct ether_header)];
#ifdef IPPROTO_TCP
if((int)iphdr->protocol != IPPROTO_TCP) {
/*printf("IP proto %d\n", (int)iphdr->protocol);*/
hashtable_iterate(hashtable, 1, 0);
continue;
}
#else
if((int)iphdr->protocol != tcp) {
/*printf("IP proto %d\n", (int)iphdr->protocol);*/
hashtable_iterate(hashtable, 1, 0);
continue;
}
#endif
#else
iphdr = (const struct ip *)&buffer[sizeof(struct ether_header)];
if((int)iphdr->ip_p != IPPROTO_TCP) {
/*printf("IP proto %d\n", (int)iphdr->ip_p);*/
hashtable_iterate(hashtable, 1, 0);
continue;
}
#endif
tcphdr = (const struct tcphdr *)&buffer[sizeof(struct ether_header) + sizeof(struct ip)];
#if 0
if((iphdr->saddr == htonl(INADDR_LOOPBACK)) || (iphdr->daddr == htonl(INADDR_LOOPBACK))) {
/*
* TODO: remove this code once the bind() code has been
* written
*/
puts("loop");
hashtable_iterate(hashtable, 1, 0);
continue;
}
#endif
#ifdef HAVE_LIBPCAP
#if 0
if(((iphdr->saddr&devicemask) != deviceaddr) && ((iphdr->daddr&devicemask) != deviceaddr)) {
/*struct in_addr addr;
memcpy(&addr, &iphdr->saddr, sizeof(struct in_addr));
printf("filter out saddr = %s ", inet_ntoa(addr));
memcpy(&addr, &iphdr->saddr, sizeof(struct in_addr));
printf("daddr = %s ", inet_ntoa(addr));
memcpy(&addr, &deviceaddr, sizeof(struct in_addr));
printf("deviceaddr = %s\n", inet_ntoa(addr));*/
hashtable_iterate(hashtable, 1, 0);
continue;
}
#endif
#else
if((iphdr->saddr != etheraddr->sin_addr.s_addr) && (iphdr->daddr != etheraddr->sin_addr.s_addr)) {
/* The above bind fails, so let's filter here */
/*puts("filter out");*/
hashtable_iterate(hashtable, 1, 0);
continue;
}
#endif
#ifdef HAVE_STRUCT_IPHDR
if(iphdr->daddr == 0) {
/* FIXME: What are these? */
puts("Destination IP is 0");
continue;
}
source_addr.i = iphdr->saddr;
sport = ntohs(tcphdr->source);
dest_addr.i = iphdr->daddr;
dport = ntohs(tcphdr->dest);
#else
memcpy(&source_addr.i, &iphdr->ip_src, sizeof(source_addr.i));
sport = ntohs(tcphdr->th_sport);
memcpy(&dest_addr.i, &iphdr->ip_dst, sizeof(source_addr.i));
dport = ntohs(tcphdr->th_dport);
#endif
if(verbose >= 3) {
struct in_addr in_addr;
in_addr.s_addr = source_addr.i;
printf("%s:%d->", inet_ntoa(in_addr), sport);
in_addr.s_addr = dest_addr.i;
printf("%s:%d", inet_ntoa(in_addr), dport);
#ifdef HAVE_STRUCT_IPHDR
printf(" seq %u", ntohl(tcphdr->seq));
if(tcphdr->fin)
fputs(" FIN", stdout);
if(tcphdr->syn)
fputs(" SYN", stdout);
#else
printf(" seq %u", ntohl(tcphdr->th_seq));
if(tcphdr->th_flags&TH_FIN)
fputs(" FIN", stdout);
if(tcphdr->th_flags&TH_SYN)
fputs(" SYN", stdout);
#endif
}
#ifdef HAVE_STRUCT_IPHDR
ptr = &buffer[sizeof(struct ether_header) + sizeof(struct iphdr) + (tcphdr->doff * sizeof(uint32_t))];
payloadlength = nbytes - sizeof(struct ether_header) - sizeof(struct iphdr) - (tcphdr->doff * sizeof(uint32_t));
#else
ptr = &buffer[sizeof(struct ether_header) + sizeof(struct ip) + (tcphdr->th_off * sizeof(uint32_t))];