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honeyd.c
3679 lines (3078 loc) · 91.2 KB
/
honeyd.c
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/*
* Copyright (c) 2002, 2003, 2004, 2005 Niels Provos <provos@citi.umich.edu>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/param.h>
#include <sys/types.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_IOCCOM_H
#include <sys/ioccom.h>
#endif
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/tree.h>
#include <sys/wait.h>
#include <sys/queue.h>
#include <pcap.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <signal.h>
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#include <unistd.h>
#include <getopt.h>
#include <pwd.h>
#include <assert.h>
#undef timeout_pending
#undef timeout_initialized
#include <dnet.h>
#include <event.h>
#include "honeyd.h"
#include "template.h"
#include "subsystem.h"
#include "personality.h"
#include "xprobe_assoc.h"
#include "ipfrag.h"
#include "router.h"
#include "network.h"
#include "tcp.h"
#include "udp.h"
#include "hooks.h"
#include "pool.h"
#include "plugins_config.h"
#include "plugins.h"
#include "interface.h"
#include "arp.h"
#include "gre.h"
#include "log.h"
#include "osfp.h"
#include "parser.h"
#include "ui.h"
#include "ethernet.h"
#include "tagging.h"
#include "stats.h"
#include "dhcpclient.h"
#include "rrdtool.h"
#include "histogram.h"
#include "update.h"
#include "util.h"
#include "personality.h"
#ifdef HAVE_PYTHON
#include <Python.h>
#include "pyextend.h"
#include "pydataprocessing.h"
#include "pydatahoneyd.h"
#endif
/* Prototypes */
void honeyd_tcp_timeout(int, short, void *);
void honeyd_udp_timeout(int, short, void *);
void honeyd_delay_cb(int, short, void *);
enum forward honeyd_route_packet(struct ip_hdr *, u_int, struct addr *,
struct addr *, int *);
void tcp_retrans_timeout(int, short, void *);
void icmp_error_send(struct template *, struct addr *, uint8_t, uint8_t,
struct ip_hdr *, struct spoof);
struct tree tcpcons;
struct conlru tcplru;
struct tree udpcons;
struct conlru udplru;
struct spoof no_spoof; /* spoof settings for default packet processing */
struct config config = {
NULL,
PATH_HONEYDDATA "/nmap-os-db",
PATH_HONEYDDATA "/xprobe2.conf",
PATH_HONEYDDATA "/nmap.assoc",
PATH_HONEYDDATA "/pf.os"
};
struct stats_network stats_network = {
0, /* input bytes */
0 /* output bytes */
};
SPLAY_PROTOTYPE(tree, tuple, node, conhdr_compare);
SPLAY_GENERATE(tree, tuple, node, conhdr_compare);
struct rrdtool_drv *honeyd_rrd_drv;
struct rrdtool_db *honeyd_traffic_db;
struct event honeyd_rrd_ev;
FILE *honeyd_servicefp;
struct timeval honeyd_uptime;
static FILE *honeyd_logfp;
static ip_t *honeyd_ip;
struct pool *pool_pkt;
struct pool *pool_delay;
rand_t *honeyd_rand;
int honeyd_sig;
int honeyd_nconnects;
int honeyd_nchildren;
int honeyd_ttl = HONEYD_DFL_TTL;
struct tcp_con honeyd_tmp;
int honeyd_show_include_dir;
int honeyd_show_data_dir;
int honeyd_show_version;
int honeyd_show_usage;
int honeyd_debug;
uid_t honeyd_uid = 32767;
gid_t honeyd_gid = 32767;
char *templateDump = NULL;
int honeyd_needsroot; /* Need different IDs */
int honeyd_disable_webserver = 0;
int honeyd_disable_update = 0;
int honeyd_ignore_parse_errors = 0;
int honeyd_verify_config = 0;
int honeyd_webserver_fix_permissions = 0;
char *honeyd_webserver_address = "127.0.0.1";
int honeyd_webserver_port = 80;
char *honeyd_webserver_root = PATH_HONEYDDATA \
"/webserver/htdocs";
char *honeyd_rrdtool_path = PATH_RRDTOOL;
/* can be used by unittests to do bad stuff */
void (*honeyd_delay_callback)(int, short, void *) = honeyd_delay_cb;
static char *logfile = NULL; /* Log file names */
static char *servicelog = NULL;
/*
* TODO: There is a patch on the Google Code page, Issue 12, that purports to be a performance
* enhancement when using honeyd as a proxy to send data through an SSH daemon. However,
* there are some parts of the patch that are now incompatible with the DataSoft honeyd
* structure. I will put a note about this in the git commits, and possibly a ticket
* for it if we suspect we'll be using honeyd in this fashion.
*/
/*
* TODO: There is another patch, Issue 13, which solves about 4 issues total on the Google Code
* page for honeyd. It is rather large, so I'm merely writing this to remind myself what
* should be done next time I'm here. I may need to pass this off to someone else, however
* given that this honeyd is modified a bit and I may not know how to resolve everything.
*/
/*
* TODO: Issue 20 is rather large, and I don't know if we'd need to functionality that it would
* provide, but I'm not familiar enough with honeyd to be comfortable with putting it in myself.
*/
static struct option honeyd_long_opts[] = {
{"include-dir", 0, &honeyd_show_include_dir, 1},
{"data-dir", 0, &honeyd_show_data_dir, 1},
{"version", 0, &honeyd_show_version, 1},
{"help", 0, &honeyd_show_usage, 1},
{"webserver-address", required_argument, NULL, 'A'},
{"webserver-port", required_argument, NULL, 'W'},
{"webserver-root", required_argument, NULL, 'X'},
{"rrdtool-path", required_argument, NULL, 'Y'},
{"disable-webserver", 0, &honeyd_disable_webserver, 1},
{"disable-update", 0, &honeyd_disable_update, 1},
{"verify-config", 0, &honeyd_verify_config, 1},
{"ignore-parse-errors", 0, &honeyd_ignore_parse_errors, 1},
{"fix-webserver-permissions", 0, &honeyd_webserver_fix_permissions, 1},
{0, 0, 0, 0}
};
void
usage(void)
{
fprintf(stderr,
"Usage: honeyd [OPTIONS] [net ...]\n\n"
"where options include:\n"
" -d Do not daemonize, be verbose.\n"
" -P Enable polling mode.\n"
" -l logfile Log packets and connections to logfile.\n"
" -s logfile Logs service status output to logfile.\n"
" -t ipFile Dumps currently used DHCP IP addresses to ipFile\n"
" -i interface Listen on interface.\n"
" -p file Read nmap-style fingerprints from file.\n"
" -x file Read xprobe-style fingerprints from file.\n"
" -a assocfile Read nmap-xprobe associations from file.\n"
" -0 osfingerprints Read pf-style OS fingerprints from file.\n"
" -u uid Set the uid Honeyd should run as.\n"
" -g gid Set the gid Honeyd should run as.\n"
" -f configfile Read configuration from file.\n"
" -c host:port:name:pass Reports starts to collector.\n"
" --webserver-address=address Address on which webserver listens.\n"
" --webserver-port=port Port on which webserver listens.\n"
" --webserver-root=path Root of document tree.\n"
" --fix-webserver-permissions Change ownership and permissions.\n"
" --rrdtool-path=path Path to rrdtool.\n"
" --disable-webserver Disables internal webserver\n"
" --disable-update Disables checking for security fixes.\n"
" --verify-config Verify configuration file then exit.\n"
" -V, --version Print program version and exit.\n"
" -h, --help Print this message and exit.\n"
"\n"
"For plugin development:\n"
" --include-dir Prints out header files directory and exits.\n"
" --data-dir Prints out data/plug-in directory and exits.\n");
exit(1);
}
/* XXX ches debug */
void
print_spoof(char *msg, struct spoof s) {
char buf2[100], buf3[100];
if (s.new_src.addr_type == ADDR_TYPE_NONE)
strlcpy(buf2, "**no addr**", sizeof(buf2));
else
addr_ntop(&s.new_src, buf2, sizeof(buf2));
if (s.new_dst.addr_type == ADDR_TYPE_NONE)
strlcpy(buf3, "**no addr**", sizeof(buf3));
else
addr_ntop(&s.new_dst, buf3, sizeof(buf3));
}
void
honeyd_settcp(struct tcp_con *con, struct ip_hdr *ip, struct tcp_hdr *tcp,
int local)
{
struct tuple *hdr = &con->conhdr;
memset(hdr, 0, sizeof(struct tuple));
hdr->ip_src = ip->ip_src;
hdr->ip_dst = ip->ip_dst;
hdr->sport = ntohs(tcp->th_sport);
hdr->dport = ntohs(tcp->th_dport);
hdr->type = SOCK_STREAM;
hdr->local = local;
con->rcv_flags = tcp->th_flags;
con->cmd.pfd = -1;
con->cmd.perrfd = -1;
}
void
honeyd_setudp(struct udp_con *con, struct ip_hdr *ip, struct udp_hdr *udp,
int local)
{
struct tuple *hdr = &con->conhdr;
memset(hdr, 0, sizeof(struct tuple));
hdr->ip_src = ip->ip_src;
hdr->ip_dst = ip->ip_dst;
hdr->sport = ntohs(udp->uh_sport);
hdr->dport = ntohs(udp->uh_dport);
hdr->type = SOCK_DGRAM;
hdr->local = local;
con->softerrors = 0;
con->cmd.pfd = -1;
con->cmd.perrfd = -1;
TAILQ_INIT(&con->incoming);
}
struct tuple *
tuple_find(struct tree *root, struct tuple *key)
{
return SPLAY_FIND(tree, root, key);
}
/*
* Iterate over all connection objects.
*/
int
tuple_iterate(struct conlru *head, int (*f)(struct tuple *, void *), void *arg)
{
struct tuple *conhdr;
TAILQ_FOREACH(conhdr, head, next) {
if ((*f)(conhdr, arg) == -1)
return (-1);
}
return (0);
}
static void
syslog_init(int argc, char *argv[])
{
int options, i;
char buf[MAXPATHLEN];
#ifdef LOG_PERROR
options = LOG_PERROR|LOG_PID|LOG_CONS;
#else
options = LOG_PID|LOG_CONS;
#endif
openlog("honeyd", options, LOG_DAEMON);
/* Create a string containing all the command line
* arguments and pass it to syslog:
*/
buf[0] = '\0';
for (i = 1; i < argc; i++) {
if (i > 1 && strlcat(buf, " ", sizeof(buf)) >= sizeof(buf))
break;
if (strlcat(buf, argv[i], sizeof(buf)) >= sizeof(buf))
break;
}
syslog(LOG_NOTICE, "started with %s", buf);
}
/*
* Update traffic statistics for honeyd.
*/
void
honeyd_rrd_cb(int fd, short what, void *arg)
{
static int count;
char line[1024];
struct event *ev = arg;
struct timeval tv;
snprintf(line, sizeof(line), "%f:%f",
(double)count_get_minute(stats_network.input_bytes)/60.0,
(double)count_get_minute(stats_network.output_bytes)/60.0);
rrdtool_db_update(honeyd_traffic_db, NULL, line);
timerclear(&tv);
tv.tv_sec = 60;
evtimer_add(ev, &tv);
/* Create a graph every five minutes */
if (count++ % 5 == 0) {
char filename[1024];
struct timeval tv;
/* Hourly graph */
timerclear(&tv);
tv.tv_sec = -7200;
snprintf(filename, sizeof(filename),
"%s/graphs/traffic_hourly.gif", honeyd_webserver_root);
rrdtool_graph(honeyd_traffic_db, filename, &tv, NULL,
"DEF:inoctets=/tmp/honeyd_traffic.rrd:input:AVERAGE "
"DEF:outoctets=/tmp/honeyd_traffic.rrd:output:AVERAGE "
"AREA:inoctets#00FF00:\"In traffic\" "
"LINE1:outoctets#0000FF:\"Out traffic\"");
/* Daily graph */
timerclear(&tv);
tv.tv_sec = -86400;
snprintf(filename, sizeof(filename),
"%s/graphs/traffic_daily.gif", honeyd_webserver_root);
rrdtool_graph(honeyd_traffic_db, filename, &tv, NULL,
"DEF:inoctets=/tmp/honeyd_traffic.rrd:input:AVERAGE "
"DEF:outoctets=/tmp/honeyd_traffic.rrd:output:AVERAGE "
"AREA:inoctets#00FF00:\"In traffic\" "
"LINE1:outoctets#0000FF:\"Out traffic\"");
}
}
void
honeyd_rrd_start(const char *rrdtool_path)
{
/* Initialize our traffic stats for rrdtool */
char *honeyd_traffic_filename = "/tmp/honeyd_traffic.rrd";
if ((honeyd_rrd_drv = rrdtool_init(rrdtool_path)) == NULL)
errx(1, "%s: cannot start rrdtool", __func__);
if ((honeyd_traffic_db = rrdtool_db_start(honeyd_rrd_drv,
honeyd_traffic_filename, 60)) == NULL)
errx(1, "%s: cannot create rrd db: %s",
__func__, honeyd_traffic_filename);
rrdtool_db_datasource(honeyd_traffic_db,
"input", "GAUGE", 600);
rrdtool_db_datasource(honeyd_traffic_db,
"output", "GAUGE", 600);
rrdtool_db_commit(honeyd_traffic_db);
/* Start the periodic traffic update timer */
evtimer_set(&honeyd_rrd_ev, honeyd_rrd_cb, &honeyd_rrd_ev);
honeyd_rrd_cb(-1, EV_TIMEOUT, &honeyd_rrd_ev);
}
/*
* Initializes data structures pertaining to the daemon
*/
void
honeyd_init(void)
{
struct rlimit rl;
struct passwd *pwd;
/* Record our start time */
gettimeofday(&honeyd_uptime, NULL);
/* Find the correct ids for nobody, if the uid was not set in the
* command line */
if ( honeyd_uid == 32767 && (pwd = getpwnam("nobody")) != NULL) {
honeyd_uid = pwd->pw_uid;
}
if ( honeyd_gid == 32767 && (pwd = getpwnam("nobody")) != NULL) {
honeyd_gid = pwd->pw_gid;
}
/* Initalize ongoing connection state */
SPLAY_INIT(&tcpcons);
TAILQ_INIT(&tcplru);
SPLAY_INIT(&udpcons);
TAILQ_INIT(&udplru);
memset(&honeyd_tmp, 0, sizeof(honeyd_tmp));
/* Raising file descriptor limits */
rl.rlim_max = RLIM_INFINITY;
rl.rlim_cur = RLIM_INFINITY;
if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
/* Linux does not seem to like this */
if (getrlimit(RLIMIT_NOFILE, &rl) == -1)
err(1, "getrlimit: NOFILE");
rl.rlim_cur = rl.rlim_max;
if (setrlimit(RLIMIT_NOFILE, &rl) == -1)
err(1, "setrlimit: NOFILE");
}
#ifdef RLIMIT_NPROC
if (getrlimit(RLIMIT_NPROC, &rl) == -1)
err(1, "getrlimit: NPROC");
rl.rlim_max = rl.rlim_max/2;
rl.rlim_cur = rl.rlim_max;
if (setrlimit(RLIMIT_NPROC, &rl) == -1)
err(1, "setrlimit: NPROC");
#endif
stats_network.input_bytes = count_new();
stats_network.output_bytes = count_new();
}
#ifdef HAVE_PYTHON
static int
honeyd_is_webserver_enabled(void)
{
if (honeyd_webserver_port <= 0)
return 0;
if (honeyd_disable_webserver)
return 0;
return (1);
}
#endif
void
honeyd_exit(int status)
{
honeyd_logend(honeyd_logfp);
honeyd_logend(honeyd_servicefp);
template_free_all(TEMPLATE_FREE_DEALLOCATE);
interface_close_all();
rand_close(honeyd_rand);
ip_close(honeyd_ip);
closelog();
unlink(PIDFILE);
#ifdef HAVE_PYTHON
if (honeyd_is_webserver_enabled())
pyextend_webserver_exit();
pyextend_exit();
#endif
exit(status);
}
/* Encapsulate a packet into Ethernet */
void
honeyd_ether_cb(struct arp_req *req, int success, void *arg)
{
u_char pkt[HONEYD_MTU + 40]; /* XXX - Enough? */
struct interface *inter = req->inter;
struct ip_hdr *ip = arg;
u_int len, iplen = ntohs(ip->ip_len);
eth_pack_hdr(pkt,
req->ha.addr_eth, /* destination */
req->src_ha.addr_eth, /* source */
ETH_TYPE_IP);
len = ETH_HDR_LEN + iplen;
if (sizeof(pkt) < len) {
syslog(LOG_WARNING, "%s: IP packet is larger than buffer: %d",
__func__, len);
goto out;
}
memcpy(pkt + ETH_HDR_LEN, ip, iplen);
if (eth_send(inter->if_eth, pkt, len) != len) {
syslog(LOG_ERR, "%s: couldn't send packet size %d: %m",
__func__, len);
} else {
count_increment(stats_network.output_bytes, iplen);
}
out:
pool_free(pool_pkt, ip);
}
/*
* Delivers an IP packet to a specific interface.
* Generates ARP request if necessary.
*/
void
honeyd_deliver_ethernet(struct interface *inter,
struct addr *src_pa, struct addr *src_ha,
struct addr *dst_pa, struct ip_hdr *ip, u_int iplen)
{
struct arp_req *req;
ip_checksum(ip, iplen);
/* Ethernet delivery if possible */
if ((req = arp_find(dst_pa)) == NULL) {
arp_request(inter, src_pa, src_ha, dst_pa, honeyd_ether_cb,ip);
} else if (req->cnt == -1) {
/*
* The source MAC of the original requestor does not help
* us here, but we can overwrite it with the MAC of this
* honeypot without causing any harm.
*/
req->src_ha = *src_ha;
honeyd_ether_cb(req, 1, ip);
} else {
/*
* Fall through in case that this packet needs
* to be dropped.
*/
pool_free(pool_pkt, ip);
}
}
/*
* Makes sure that we end up owning the memory referenced by
* the delay descriptor. We either tell to not free the
* memory or just make our own copy.
*/
struct ip_hdr *
honeyd_delay_own_memory(struct delay *delay, struct ip_hdr *ip, u_int iplen)
{
/* If we are not supposed to free the buffer then we do not own it */
if (!(delay->flags & DELAY_FREEPKT)) {
void *tmp = pool_alloc(pool_pkt);
memcpy(tmp, ip, iplen);
ip = tmp;
} else {
/*
* We are handling the memory ourselves: if we
* delegate the memory to the ARP handler, it will get
* freed later.
*/
delay->flags &= ~DELAY_FREEPKT;
}
return (ip);
}
/*
* This function delivers the actual packet to the network.
* It supports internal delivery, external delivery via ip_send
* and external delivery via ethernet encapsulation.
*
* This function handles the following cases:
* - TTL is 0: send ICMP time exceeded in transit message
* - External: Packet is delivered to the real network
* - Tunnel: Packet is GRE encapsulated and sent to a remote location
* - Ethernet: A physical machine has been integrate into the virtual
* routing topology and we need to ethernet encapsulate the packet.
* - Arp: The destination machine is configured to be on the physical link,
* so arp for it and ethernet encapsulate the packet.
* - Everything else: The packet is delivered internally after potential
* fragment reassembly.
*
* It needs to unreference the passed template value.
*/
static __inline void
honeyd_send_normally(struct ip_hdr *ip, u_int iplen)
{
ip_checksum(ip, iplen);
if (ip_send(honeyd_ip, ip, iplen) != iplen) {
int level = LOG_ERR;
if (errno == EHOSTDOWN || errno == EHOSTUNREACH)
level = LOG_DEBUG;
syslog(level, "couldn't send packet: %m");
} else {
count_increment(stats_network.output_bytes, iplen);
}
}
void
honeyd_delay_cb(int fd, short which, void *arg)
{
struct delay *delay = arg;
struct ip_hdr *ip = delay->ip;
struct template *tmpl = delay->tmpl;
u_int iplen = delay->iplen;
if (!ip->ip_ttl) {
/* Fix up TTL */
ip->ip_ttl++;
ip_checksum(ip, ip->ip_hl << 2);
icmp_error_send(tmpl, &delay->src,
ICMP_TIMEXCEED, ICMP_TIMEXCEED_INTRANS, ip, delay->spoof);
} else if (delay->flags & DELAY_UNREACH) {
/* Fix up TTL */
ip->ip_ttl++;
ip_checksum(ip, ip->ip_hl << 2);
icmp_error_send(tmpl, &delay->src,
ICMP_UNREACH, ICMP_UNREACH_NET, ip, delay->spoof);
} else if (delay->flags & DELAY_EXTERNAL) {
struct addr dst;
addr_pack(&dst, ADDR_TYPE_IP, IP_ADDR_BITS,
&ip->ip_dst, IP_ADDR_LEN);
/* This is the source template */
if (tmpl != NULL && tmpl->ethernet_addr != NULL &&
interface_find_responsible(&dst) == tmpl->inter) {
struct addr src;
/* To do ARP, we need to know all this information */
addr_pack(&src, ADDR_TYPE_IP, IP_ADDR_BITS,
&ip->ip_src, IP_ADDR_LEN);
ip = honeyd_delay_own_memory(delay, ip, iplen);
/* This function computes the IP checksum for us */
honeyd_deliver_ethernet(tmpl->inter,
&src, tmpl->ethernet_addr,
&dst, ip, iplen);
} else {
honeyd_send_normally(ip, iplen);
}
} else if (delay->flags & DELAY_TUNNEL) {
ip_checksum(ip, iplen);
if (gre_encapsulate(honeyd_ip, &delay->src, &delay->dst,
ip, iplen) == -1)
syslog(LOG_ERR, "couldn't GRE encapsulate packet: %m");
else
count_increment(stats_network.output_bytes, iplen);
} else if (delay->flags & DELAY_ETHERNET) {
extern struct network *reverse;
struct interface *inter = tmpl->inter;
struct router *router;
struct addr addr;
/*
* If a physical honeypot has been integrated into the
* virtual routing topology, we need to find the
* corresponding router.
*/
addr_pack(&addr, ADDR_TYPE_IP, IP_ADDR_BITS,
&ip->ip_dst, IP_ADDR_LEN);
router = network_lookup(reverse, &addr);
if (router == NULL)
errx(1, "%s: bad configuration", __func__);
/*
* If we are routing for an external sender, then we
* might have to copy the packet into an allocated
* buffer.
*/
ip = honeyd_delay_own_memory(delay, ip, iplen);
/* This function computes the IP checksum for us */
honeyd_deliver_ethernet(inter,
&router->addr, &inter->if_ent.intf_link_addr,
&addr, ip, iplen);
} else {
struct addr addr;
uint16_t ipoff;
template_free(tmpl);
addr_pack(&addr, ADDR_TYPE_IP, IP_ADDR_BITS,
&ip->ip_dst, IP_ADDR_LEN);
/* Internal delivery */
tmpl = template_find_best(addr_ntoa(&addr), ip, iplen);
tmpl = template_ref(tmpl);
/* Check for fragmentation */
ipoff = ntohs(ip->ip_off);
if ((ipoff & IP_OFFMASK) || (ipoff & IP_MF)) {
struct ip_hdr *nip;
u_short niplen;
if (ip_fragment(tmpl, ip, iplen, &nip, &niplen) == 0)
honeyd_dispatch(tmpl, nip, niplen);
} else
honeyd_dispatch(tmpl, ip, iplen);
}
if (delay->flags & DELAY_FREEPKT)
pool_free(pool_pkt, ip);
template_free(tmpl);
if (delay->flags & DELAY_NEEDFREE)
pool_free(pool_delay, delay);
}
/*
* Delays a packet for a specified amount of ms to simulate routing delay.
* Host is used for the router that might generate a XCEED message.
*/
void
honeyd_delay_packet(struct template *tmpl, struct ip_hdr *ip, u_int iplen,
const struct addr *src, const struct addr *dst, int ms, int flags,
struct spoof spoof)
{
struct delay *delay, tmp_delay;
struct timeval tv;
if (ms) {
delay = pool_alloc(pool_delay);
flags |= DELAY_NEEDFREE;
/*
* If the IP packet is not allocated separately, we
* need to allocate it here.
*/
if ((flags & DELAY_FREEPKT) == 0) {
void *tmp;
if (iplen < HONEYD_MTU)
tmp = pool_alloc(pool_pkt);
else
tmp = pool_alloc_size(pool_pkt, iplen);
memcpy(tmp, ip, iplen);
ip = tmp;
flags |= DELAY_FREEPKT;
}
} else {
memset(&tmp_delay, 0, sizeof(tmp_delay));
delay = &tmp_delay;
}
delay->ip = ip;
delay->iplen = iplen;
if (src != NULL)
delay->src = *src;
if (dst != NULL)
delay->dst = *dst;
delay->tmpl = template_ref(tmpl);
delay->flags = flags;
delay->spoof = spoof;
if (ms) {
evtimer_set(&delay->timeout, honeyd_delay_callback, delay);
timerclear(&tv);
tv.tv_sec = ms / 1000;
tv.tv_usec = (ms % 1000) * 1000;
evtimer_add(&delay->timeout, &tv);
} else
honeyd_delay_callback(-1, EV_TIMEOUT, delay);
}
/*
* This function allows us to deliver packets to virtual hosts as well
* as to external hosts. If virtual routing topologies are enabled,
* characteristics like packet loss, latency and ttl decrements are
* taken into consideration.
*/
void
honeyd_ip_send(u_char *pkt, u_int iplen, struct spoof spoof)
{
struct template *tmpl = NULL;
struct ip_hdr *ip = (struct ip_hdr *)pkt;
enum forward res = FW_EXTERNAL;
int delay = 0, flags = 0;
struct addr addr, src;
print_spoof("honeyd_ip_send", spoof);
if (iplen > HONEYD_MTU) {
u_short off = ntohs(ip->ip_off);
if ((off & IP_DF) == 0)
ip_send_fragments(HONEYD_MTU, ip, iplen, spoof);
goto drop;
}
if (spoof.new_dst.addr_type != ADDR_TYPE_NONE)
ip->ip_dst = spoof.new_dst.addr_ip;
addr_pack(&addr, ADDR_TYPE_IP, IP_ADDR_BITS, &ip->ip_dst, IP_ADDR_LEN);
addr_pack(&src, ADDR_TYPE_IP, IP_ADDR_BITS, &ip->ip_src, IP_ADDR_LEN);
/* Find the template for the external address */
tmpl = template_find_best(addr_ntoa(&addr), ip, iplen);
if (tmpl != NULL && tmpl->flags & TEMPLATE_EXTERNAL)
flags |= DELAY_ETHERNET;
/* But all sending decisions are really based on the source template */
tmpl = template_find_best(addr_ntoa(&src), ip, iplen);
if (router_used) {
extern struct network *reverse;
struct router *router;
router = network_lookup(reverse, &src);
if (router == NULL) {
syslog(LOG_NOTICE, "No reverse routing map for %s",
addr_ntoa(&src));
goto drop;
}
/*
* If the router itself is sending the packet, the first
* routing table lookup does not decrease the ttl.
*/
if (addr_cmp(&src, &router->addr) == 0)
ip->ip_ttl++; /* XXX - Ugly hack */
if (spoof.new_src.addr_type != ADDR_TYPE_NONE)
ip->ip_src = spoof.new_src.addr_ip;
res = honeyd_route_packet(ip, iplen, &router->addr, &addr,
&delay);
if (res == FW_DROP)
goto drop;
}
/* Remember that the packet buffer has to be freed at the end */
flags |= DELAY_FREEPKT;
if (res == FW_EXTERNAL)
flags |= DELAY_EXTERNAL;
if (spoof.new_src.addr_type != ADDR_TYPE_NONE)
ip->ip_src = spoof.new_src.addr_ip;
if (spoof.new_dst.addr_type != ADDR_TYPE_NONE)
ip->ip_dst = spoof.new_dst.addr_ip;
/* Delay the packet if necessary, otherwise deliver it directly */
honeyd_delay_packet(tmpl, ip, iplen, NULL, NULL, delay, flags, spoof);
return;
drop:
/* Deallocate the packet */
pool_free(pool_pkt, pkt);
}
static void
connection_insert(struct tree *tree, struct conlru *head, struct tuple *hdr)
{
SPLAY_INSERT(tree, tree, hdr);
TAILQ_INSERT_HEAD(head, hdr, next);
}
static void
connection_remove(struct tree *tree, struct conlru *head, struct tuple *hdr)
{
SPLAY_REMOVE(tree, tree, hdr);
TAILQ_REMOVE(head, hdr, next);
evtimer_del(&hdr->timeout);
}
/* Called when a connection received data and has not been idle */
static void
connection_update(struct conlru *head, struct tuple *hdr)
{
TAILQ_REMOVE(head, hdr, next);
TAILQ_INSERT_HEAD(head, hdr, next);
generic_timeout(&hdr->timeout, HONEYD_IDLE_TIMEOUT);
}
struct tcp_con *
tcp_new(struct ip_hdr *ip, struct tcp_hdr *tcp, int local)
{
struct tcp_con *con;
if (honeyd_nconnects >= HONEYD_MAX_CONNECTS) {
/*
* We seem to be in an overload situation - remove the
* oldest connection available.
*/
con = (struct tcp_con *)TAILQ_LAST(&tcplru, conlru);
tcp_free(con);
}
if ((con = calloc(1, sizeof(struct tcp_con))) == NULL) {
syslog(LOG_WARNING, "calloc: %m");
return (NULL);
}
honeyd_nconnects++;
honeyd_settcp(con, ip, tcp, local);
evtimer_set(&con->conhdr.timeout, honeyd_tcp_timeout, con);
evtimer_set(&con->retrans_timeout, tcp_retrans_timeout, con);
connection_insert(&tcpcons, &tcplru, &con->conhdr);
honeyd_log_flownew(honeyd_logfp, IP_PROTO_TCP, &con->conhdr);
return (con);
}
void
tcp_free(struct tcp_con *con)
{
struct port *port = con->port;
struct port_encapsulate *pending = con->conhdr.pending;
if (pending != NULL)
port_encapsulation_free(pending);
if (port != NULL)
port_free(port->subtmpl, port);
connection_remove(&tcpcons, &tcplru, &con->conhdr);
hooks_dispatch(IP_PROTO_TCP, HD_INCOMING_STREAM, &con->conhdr,
NULL, 0);
honeyd_log_flowend(honeyd_logfp, IP_PROTO_TCP, &con->conhdr);
evtimer_del(&con->retrans_timeout);
if (con->cmd_pfd > 0)
cmd_free(&con->cmd);
if (con->payload != NULL)
free(con->payload);