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548 lines
19 KiB
C
548 lines
19 KiB
C
/* Copyright (C) 2007-2013 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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* \author William Metcalf <william.metcalf@gmail.com>
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*
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* RespondRejectLibnet11 used to send out libnet based
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* TCP resets and ICMP unreachables.
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*
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* \todo calculate TTL base on average from stream tracking
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* \todo come up with a way for users to specify icmp unreachable type
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* \todo Possibly default to port unreachable for UDP traffic this seems
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* to be the default in flexresp and iptables
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* \todo implement ipv6 resets
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* \todo implement pre-alloc resets for speed
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*/
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#include "suricata-common.h"
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#include "decode.h"
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#include "decode-ipv4.h"
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#include "decode-tcp.h"
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#include "decode-sctp.h"
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#include "decode-udp.h"
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#include "packet-queue.h"
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#include "threads.h"
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#include "threadvars.h"
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#include "tm-queuehandlers.h"
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#include "tm-threads.h"
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#include "action-globals.h"
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#include "respond-reject.h"
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#include "respond-reject-libnet11.h"
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#include "util-device.h"
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#ifdef HAVE_LIBNET11
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#ifndef HAVE_LIBNET_INIT_CONST
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#define LIBNET_INIT_CAST (char *)
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#else
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#define LIBNET_INIT_CAST
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#endif
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/** set to true in main if we're setting caps. We need it here if we're using
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* reject rules as libnet 1.1 is not compatible with caps. */
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extern int sc_set_caps;
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#include <libnet.h>
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extern uint8_t host_mode;
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typedef struct Libnet11Packet_ {
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uint32_t ack, seq;
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uint16_t window, dsize;
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uint8_t ttl;
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uint16_t id;
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uint32_t flow;
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uint8_t class;
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struct libnet_in6_addr src6, dst6;
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uint32_t src4, dst4;
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uint16_t sp, dp;
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size_t len;
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} Libnet11Packet;
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int RejectSendLibnet11L3IPv4TCP(ThreadVars *tv, Packet *p, void *data, int dir)
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{
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Libnet11Packet lpacket;
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libnet_t *c; /* libnet context */
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char ebuf[LIBNET_ERRBUF_SIZE];
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int result;
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const char *devname = NULL;
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/* fill in struct defaults */
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lpacket.ttl = 0;
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lpacket.id = 0;
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lpacket.flow = 0;
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lpacket.class = 0;
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if (IS_SURI_HOST_MODE_SNIFFER_ONLY(host_mode) && (p->livedev)) {
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devname = p->livedev->dev;
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SCLogDebug("Will emit reject packet on dev %s", devname);
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}
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if ((c = libnet_init(LIBNET_RAW4, LIBNET_INIT_CAST devname, ebuf)) == NULL) {
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SCLogError(SC_ERR_LIBNET_INIT,"libnet_init failed: %s", ebuf);
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return 1;
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}
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if (p->tcph == NULL)
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return 1;
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/* save payload len */
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lpacket.dsize = p->payload_len;
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switch (dir) {
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case REJECT_DIR_SRC:
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SCLogDebug("sending a tcp reset to src");
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/* We follow http://tools.ietf.org/html/rfc793#section-3.4 :
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* If packet has no ACK, the seq number is 0 and the ACK is built
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* the normal way. If packet has a ACK, the seq of the RST packet
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* is equal to the ACK of incoming packet and the ACK is build
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* using packet sequence number and size of the data. */
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if (TCP_GET_ACK(p) == 0) {
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lpacket.seq = 0;
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lpacket.ack = TCP_GET_SEQ(p) + lpacket.dsize + 1;
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} else {
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lpacket.seq = TCP_GET_ACK(p);
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lpacket.ack = TCP_GET_SEQ(p) + lpacket.dsize;
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}
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lpacket.sp = TCP_GET_DST_PORT(p);
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lpacket.dp = TCP_GET_SRC_PORT(p);
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lpacket.src4 = GET_IPV4_DST_ADDR_U32(p);
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lpacket.dst4 = GET_IPV4_SRC_ADDR_U32(p);
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break;
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case REJECT_DIR_DST:
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SCLogDebug("sending a tcp reset to dst");
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lpacket.seq = TCP_GET_SEQ(p);
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lpacket.ack = TCP_GET_ACK(p);
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lpacket.sp = TCP_GET_SRC_PORT(p);
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lpacket.dp = TCP_GET_DST_PORT(p);
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lpacket.src4 = GET_IPV4_SRC_ADDR_U32(p);
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lpacket.dst4 = GET_IPV4_DST_ADDR_U32(p);
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break;
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default:
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SCLogError(SC_ERR_LIBNET_INVALID_DIR,
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"reset not src or dst returning");
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return 1;
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}
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lpacket.window = TCP_GET_WINDOW(p);
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//lpacket.seq += lpacket.dsize;
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/* TODO come up with ttl calc function */
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lpacket.ttl = 64;
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/* build the package */
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if ((libnet_build_tcp(
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lpacket.sp, /* source port */
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lpacket.dp, /* dst port */
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lpacket.seq, /* seq number */
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lpacket.ack, /* ack number */
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TH_RST|TH_ACK, /* flags */
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lpacket.window, /* window size */
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0, /* checksum */
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0, /* urgent flag */
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LIBNET_TCP_H, /* header length */
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NULL, /* payload */
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0, /* payload length */
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c, /* libnet context */
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0)) < 0) /* libnet ptag */
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{
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SCLogError(SC_ERR_LIBNET_BUILD_FAILED,"libnet_build_tcp %s", libnet_geterror(c));
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goto cleanup;
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}
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if ((libnet_build_ipv4(
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LIBNET_TCP_H + LIBNET_IPV4_H, /* entire packet length */
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0, /* tos */
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lpacket.id, /* ID */
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0, /* fragmentation flags and offset */
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lpacket.ttl, /* TTL */
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IPPROTO_TCP, /* protocol */
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0, /* checksum */
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lpacket.src4, /* source address */
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lpacket.dst4, /* destination address */
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NULL, /* pointer to packet data (or NULL) */
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0, /* payload length */
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c, /* libnet context pointer */
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0)) < 0) /* packet id */
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{
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SCLogError(SC_ERR_LIBNET_BUILD_FAILED,"libnet_build_ipv4 %s", libnet_geterror(c));
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goto cleanup;
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}
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result = libnet_write(c);
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if (result == -1) {
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SCLogError(SC_ERR_LIBNET_WRITE_FAILED,"libnet_write failed: %s", libnet_geterror(c));
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goto cleanup;
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}
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cleanup:
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libnet_destroy (c);
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return 0;
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}
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int RejectSendLibnet11L3IPv4ICMP(ThreadVars *tv, Packet *p, void *data, int dir)
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{
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Libnet11Packet lpacket;
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libnet_t *c; /* libnet context */
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char ebuf[LIBNET_ERRBUF_SIZE];
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int result;
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const char *devname = NULL;
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/* fill in struct defaults */
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lpacket.ttl = 0;
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lpacket.id = 0;
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lpacket.flow = 0;
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lpacket.class = 0;
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lpacket.len = (IPV4_GET_HLEN(p) + p->payload_len);
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if (IS_SURI_HOST_MODE_SNIFFER_ONLY(host_mode) && (p->livedev)) {
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devname = p->livedev->dev;
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}
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if ((c = libnet_init(LIBNET_RAW4, LIBNET_INIT_CAST devname, ebuf)) == NULL) {
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SCLogError(SC_ERR_LIBNET_INIT,"libnet_inint failed: %s", ebuf);
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return 1;
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}
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switch (dir) {
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case REJECT_DIR_SRC:
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lpacket.src4 = GET_IPV4_DST_ADDR_U32(p);
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lpacket.dst4 = GET_IPV4_SRC_ADDR_U32(p);
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break;
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case REJECT_DIR_DST:
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lpacket.src4 = GET_IPV4_SRC_ADDR_U32(p);
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lpacket.dst4 = GET_IPV4_DST_ADDR_U32(p);
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break;
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default:
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SCLogError(SC_ERR_LIBNET_INVALID_DIR,
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"reset not src or dst returning");
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return 1;
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}
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/* TODO come up with ttl calc function */
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lpacket.ttl = 64;
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/* build the package */
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if ((libnet_build_icmpv4_unreach(
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ICMP_DEST_UNREACH, /* type */
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ICMP_HOST_ANO, /* code */
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0, /* checksum */
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(uint8_t *)p->ip4h, /* payload */
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lpacket.len, /* payload length */
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c, /* libnet context */
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0)) < 0) /* libnet ptag */
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{
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SCLogError(SC_ERR_LIBNET_BUILD_FAILED,"libnet_build_icmpv4_unreach %s", libnet_geterror(c));
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goto cleanup;
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}
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if ((libnet_build_ipv4(
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LIBNET_ICMPV4_H + LIBNET_IPV4_H +
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lpacket.len, /* entire packet length */
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0, /* tos */
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lpacket.id, /* ID */
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0, /* fragmentation flags and offset */
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lpacket.ttl, /* TTL */
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IPPROTO_ICMP, /* protocol */
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0, /* checksum */
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lpacket.src4, /* source address */
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lpacket.dst4, /* destination address */
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NULL, /* pointer to packet data (or NULL) */
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0, /* payload length */
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c, /* libnet context pointer */
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0)) < 0) /* packet id */
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{
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SCLogError(SC_ERR_LIBNET_BUILD_FAILED,"libnet_build_ipv4 %s", libnet_geterror(c));
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goto cleanup;
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}
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result = libnet_write(c);
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if (result == -1) {
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SCLogError(SC_ERR_LIBNET_WRITE_FAILED,"libnet_write_raw_ipv4 failed: %s", libnet_geterror(c));
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goto cleanup;
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}
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cleanup:
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libnet_destroy (c);
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return 0;
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}
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int RejectSendLibnet11L3IPv6TCP(ThreadVars *tv, Packet *p, void *data, int dir)
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{
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Libnet11Packet lpacket;
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libnet_t *c; /* libnet context */
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char ebuf[LIBNET_ERRBUF_SIZE];
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int result;
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const char *devname = NULL;
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/* fill in struct defaults */
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lpacket.ttl = 0;
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lpacket.id = 0;
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lpacket.flow = 0;
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lpacket.class = 0;
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if (IS_SURI_HOST_MODE_SNIFFER_ONLY(host_mode) && (p->livedev)) {
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devname = p->livedev->dev;
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}
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if ((c = libnet_init(LIBNET_RAW6, LIBNET_INIT_CAST devname, ebuf)) == NULL) {
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SCLogError(SC_ERR_LIBNET_INIT,"libnet_init failed: %s", ebuf);
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return 1;
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}
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if (p->tcph == NULL)
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return 1;
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/* save payload len */
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lpacket.dsize = p->payload_len;
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switch (dir) {
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case REJECT_DIR_SRC:
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SCLogDebug("sending a tcp reset to src");
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/* We follow http://tools.ietf.org/html/rfc793#section-3.4 :
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* If packet has no ACK, the seq number is 0 and the ACK is built
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* the normal way. If packet has a ACK, the seq of the RST packet
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* is equal to the ACK of incoming packet and the ACK is build
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* using packet sequence number and size of the data. */
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if (TCP_GET_ACK(p) == 0) {
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lpacket.seq = 0;
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lpacket.ack = TCP_GET_SEQ(p) + lpacket.dsize + 1;
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} else {
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lpacket.seq = TCP_GET_ACK(p);
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lpacket.ack = TCP_GET_SEQ(p) + lpacket.dsize;
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}
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lpacket.sp = TCP_GET_DST_PORT(p);
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lpacket.dp = TCP_GET_SRC_PORT(p);
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memcpy(lpacket.src6.libnet_s6_addr, GET_IPV6_DST_ADDR(p), 16);
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memcpy(lpacket.dst6.libnet_s6_addr, GET_IPV6_SRC_ADDR(p), 16);
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break;
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case REJECT_DIR_DST:
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SCLogDebug("sending a tcp reset to dst");
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lpacket.seq = TCP_GET_SEQ(p);
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lpacket.ack = TCP_GET_ACK(p);
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lpacket.sp = TCP_GET_SRC_PORT(p);
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lpacket.dp = TCP_GET_DST_PORT(p);
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memcpy(lpacket.src6.libnet_s6_addr, GET_IPV6_SRC_ADDR(p), 16);
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memcpy(lpacket.dst6.libnet_s6_addr, GET_IPV6_DST_ADDR(p), 16);
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break;
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default:
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SCLogError(SC_ERR_LIBNET_INVALID_DIR,
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"reset not src or dst returning");
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return 1;
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}
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lpacket.window = TCP_GET_WINDOW(p);
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//lpacket.seq += lpacket.dsize;
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/* TODO come up with ttl calc function */
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lpacket.ttl = 64;
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/* build the package */
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if ((libnet_build_tcp(
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lpacket.sp, /* source port */
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lpacket.dp, /* dst port */
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lpacket.seq, /* seq number */
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lpacket.ack, /* ack number */
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TH_RST|TH_ACK, /* flags */
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lpacket.window, /* window size */
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0, /* checksum */
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0, /* urgent flag */
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LIBNET_TCP_H, /* header length */
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NULL, /* payload */
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0, /* payload length */
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c, /* libnet context */
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0)) < 0) /* libnet ptag */
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{
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SCLogError(SC_ERR_LIBNET_BUILD_FAILED,"libnet_build_tcp %s", libnet_geterror(c));
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goto cleanup;
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}
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if ((libnet_build_ipv6(
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lpacket.class, /* traffic class */
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lpacket.flow, /* Flow label */
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LIBNET_TCP_H, /* payload length */
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IPPROTO_TCP, /* next header */
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lpacket.ttl, /* TTL */
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lpacket.src6, /* source address */
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lpacket.dst6, /* destination address */
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NULL, /* pointer to packet data (or NULL) */
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0, /* payload length */
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c, /* libnet context pointer */
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0)) < 0) /* packet id */
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{
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SCLogError(SC_ERR_LIBNET_BUILD_FAILED,"libnet_build_ipv6 %s", libnet_geterror(c));
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goto cleanup;
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}
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result = libnet_write(c);
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if (result == -1) {
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SCLogError(SC_ERR_LIBNET_WRITE_FAILED,"libnet_write failed: %s", libnet_geterror(c));
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goto cleanup;
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}
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cleanup:
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libnet_destroy (c);
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return 0;
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}
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#ifdef HAVE_LIBNET_ICMPV6_UNREACH
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int RejectSendLibnet11L3IPv6ICMP(ThreadVars *tv, Packet *p, void *data, int dir)
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{
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Libnet11Packet lpacket;
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libnet_t *c; /* libnet context */
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char ebuf[LIBNET_ERRBUF_SIZE];
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int result;
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const char *devname = NULL;
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/* fill in struct defaults */
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lpacket.ttl = 0;
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lpacket.id = 0;
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lpacket.flow = 0;
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lpacket.class = 0;
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lpacket.len = IPV6_GET_PLEN(p) + IPV6_HEADER_LEN;
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if (IS_SURI_HOST_MODE_SNIFFER_ONLY(host_mode) && (p->livedev)) {
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devname = p->livedev->dev;
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}
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if ((c = libnet_init(LIBNET_RAW6, LIBNET_INIT_CAST devname, ebuf)) == NULL) {
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SCLogError(SC_ERR_LIBNET_INIT,"libnet_inint failed: %s", ebuf);
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return 1;
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}
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switch (dir) {
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case REJECT_DIR_SRC:
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memcpy(lpacket.src6.libnet_s6_addr, GET_IPV6_DST_ADDR(p), 16);
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memcpy(lpacket.dst6.libnet_s6_addr, GET_IPV6_SRC_ADDR(p), 16);
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break;
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case REJECT_DIR_DST:
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memcpy(lpacket.src6.libnet_s6_addr, GET_IPV6_SRC_ADDR(p), 16);
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memcpy(lpacket.dst6.libnet_s6_addr, GET_IPV6_DST_ADDR(p), 16);
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break;
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default:
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SCLogError(SC_ERR_LIBNET_INVALID_DIR,
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"reset not src or dst returning");
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return 1;
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}
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/* TODO come up with ttl calc function */
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lpacket.ttl = 64;
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/* build the package */
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if ((libnet_build_icmpv6_unreach(
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ICMP6_DST_UNREACH, /* type */
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ICMP6_DST_UNREACH_ADMIN, /* code */
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0, /* checksum */
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(uint8_t *)p->ip6h, /* payload */
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lpacket.len, /* payload length */
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c, /* libnet context */
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0)) < 0) /* libnet ptag */
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{
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SCLogError(SC_ERR_LIBNET_BUILD_FAILED,"libnet_build_icmpv6_unreach %s", libnet_geterror(c));
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goto cleanup;
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}
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if ((libnet_build_ipv6(
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lpacket.class, /* traffic class */
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lpacket.flow, /* Flow label */
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LIBNET_ICMPV6_H + lpacket.len, /* IPv6 payload length */
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IPPROTO_ICMPV6, /* next header */
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lpacket.ttl, /* TTL */
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lpacket.src6, /* source address */
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lpacket.dst6, /* destination address */
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NULL, /* pointer to packet data (or NULL) */
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0, /* payload length */
|
|
c, /* libnet context pointer */
|
|
0)) < 0) /* packet id */
|
|
{
|
|
SCLogError(SC_ERR_LIBNET_BUILD_FAILED,"libnet_build_ipv6 %s", libnet_geterror(c));
|
|
goto cleanup;
|
|
}
|
|
|
|
result = libnet_write(c);
|
|
if (result == -1) {
|
|
SCLogError(SC_ERR_LIBNET_WRITE_FAILED,"libnet_write_raw_ipv6 failed: %s", libnet_geterror(c));
|
|
goto cleanup;
|
|
}
|
|
|
|
cleanup:
|
|
libnet_destroy (c);
|
|
return 0;
|
|
}
|
|
#else /* HAVE_LIBNET_ICMPV6_UNREACH */
|
|
|
|
int RejectSendLibnet11L3IPv6ICMP(ThreadVars *tv, Packet *p, void *data, int dir)
|
|
{
|
|
SCLogError(SC_ERR_LIBNET_NOT_ENABLED, "Libnet ICMPv6 based rejects are disabled."
|
|
"Usually this means that you don't have a patched libnet installed,"
|
|
" or configure couldn't find it.");
|
|
return 0;
|
|
}
|
|
#endif /* HAVE_LIBNET_ICMPV6_UNREACH */
|
|
|
|
|
|
#else
|
|
|
|
int RejectSendLibnet11L3IPv4TCP(ThreadVars *tv, Packet *p, void *data, int dir)
|
|
{
|
|
SCLogError(SC_ERR_LIBNET_NOT_ENABLED, "Libnet based rejects are disabled."
|
|
"Usually this means that you don't have libnet installed,"
|
|
" or configure couldn't find it.");
|
|
return 0;
|
|
}
|
|
|
|
int RejectSendLibnet11L3IPv4ICMP(ThreadVars *tv, Packet *p, void *data, int dir)
|
|
{
|
|
SCLogError(SC_ERR_LIBNET_NOT_ENABLED, "Libnet based rejects are disabled."
|
|
"Usually this means that you don't have libnet installed,"
|
|
" or configure couldn't find it.");
|
|
return 0;
|
|
}
|
|
|
|
int RejectSendLibnet11L3IPv6TCP(ThreadVars *tv, Packet *p, void *data, int dir)
|
|
{
|
|
SCLogError(SC_ERR_LIBNET_NOT_ENABLED, "Libnet based rejects are disabled."
|
|
"Usually this means that you don't have libnet installed,"
|
|
" or configure couldn't find it.");
|
|
return 0;
|
|
}
|
|
|
|
int RejectSendLibnet11L3IPv6ICMP(ThreadVars *tv, Packet *p, void *data, int dir)
|
|
{
|
|
SCLogError(SC_ERR_LIBNET_NOT_ENABLED, "Libnet based rejects are disabled."
|
|
"Usually this means that you don't have libnet installed,"
|
|
" or configure couldn't find it.");
|
|
return 0;
|
|
}
|
|
|
|
#endif /* HAVE_LIBNET11 */
|