print-isakmp.c

来自「TCPDUMP的C语言源代码,是在数据链路层的应用」· C语言 代码 · 共 2,402 行 · 第 1/4 页

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-isakmp.c,v 1.56 2007-08-29 12:31:00 mcr Exp $ (LBL)";
#endif

#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <string.h>

#include <stdio.h>

#include "isakmp.h"
#include "ipsec_doi.h"
#include "oakley.h"
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"                    /* must come after interface.h */

#include "ip.h"
#ifdef INET6
#include "ip6.h"
#endif

#ifndef HAVE_SOCKADDR_STORAGE
#define sockaddr_storage sockaddr
#endif

#define DECLARE_PRINTER(func) static const u_char *ike##func##_print( \
		netdissect_options *ndo, u_char tpay,	              \
		const struct isakmp_gen *ext,			      \
		u_int item_len, \
		const u_char *end_pointer, \
		u_int32_t phase,\
		u_int32_t doi0, \
		u_int32_t proto0, int depth)

DECLARE_PRINTER(v1_sa);
DECLARE_PRINTER(v1_p);
DECLARE_PRINTER(v1_t);
DECLARE_PRINTER(v1_ke);
DECLARE_PRINTER(v1_id);
DECLARE_PRINTER(v1_cert);
DECLARE_PRINTER(v1_cr);
DECLARE_PRINTER(v1_sig);
DECLARE_PRINTER(v1_hash);
DECLARE_PRINTER(v1_nonce);
DECLARE_PRINTER(v1_n);
DECLARE_PRINTER(v1_d);
DECLARE_PRINTER(v1_vid);

DECLARE_PRINTER(v2_sa);
DECLARE_PRINTER(v2_ke);
DECLARE_PRINTER(v2_ID);
DECLARE_PRINTER(v2_cert);
DECLARE_PRINTER(v2_cr);
DECLARE_PRINTER(v2_auth);
DECLARE_PRINTER(v2_nonce);
DECLARE_PRINTER(v2_n);
DECLARE_PRINTER(v2_d);
DECLARE_PRINTER(v2_vid);
DECLARE_PRINTER(v2_TS);
DECLARE_PRINTER(v2_e);
DECLARE_PRINTER(v2_cp);
DECLARE_PRINTER(v2_eap);

static const u_char *ike_sub0_print(netdissect_options *ndo,u_char, const struct isakmp_gen *,
	const u_char *,	u_int32_t, u_int32_t, u_int32_t, int);
static const u_char *ikev1_sub_print(netdissect_options *ndo,u_char, const struct isakmp_gen *,
	const u_char *, u_int32_t, u_int32_t, u_int32_t, int);

static const u_char *ikev2_sub_print(netdissect_options *ndo,
				     u_char np, const struct isakmp_gen *ext,
				     const u_char *ep, u_int32_t phase,
				     u_int32_t doi, u_int32_t proto,
				     int depth);


static char *numstr(int);
static void safememcpy(void *, const void *, size_t);

static void
ikev1_print(netdissect_options *ndo,
	    const u_char *bp,  u_int length,
	    const u_char *bp2, struct isakmp *base);

#define MAXINITIATORS	20
int ninitiator = 0;
struct {
	cookie_t initiator;
	struct sockaddr_storage iaddr;
	struct sockaddr_storage raddr;
} cookiecache[MAXINITIATORS];

/* protocol id */
static const char *protoidstr[] = {
	NULL, "isakmp", "ipsec-ah", "ipsec-esp", "ipcomp",
};

/* isakmp->np */
static const char *npstr[] = {
	"none", "sa", "p", "t", "ke", "id", "cert", "cr", "hash", /* 0 - 8 */
	"sig", "nonce", "n", "d", "vid",      /* 9 - 13 */
	"pay14", "pay15", "pay16", "pay17", "pay18", /* 14- 18 */
	"pay19", "pay20", "pay21", "pay22", "pay23", /* 19- 23 */
	"pay24", "pay25", "pay26", "pay27", "pay28", /* 24- 28 */
	"pay29", "pay30", "pay31", "pay32",          /* 29- 32 */
	"v2sa",  "v2ke",  "v2IDi", "v2IDr", "v2cert",/* 33- 37 */
	"v2cr",  "v2auth","v2nonce", "v2n",   "v2d",   /* 38- 42 */
	"v2vid", "v2TSi", "v2TSr", "v2e",   "v2cp",  /* 43- 47 */
	"v2eap",                                     /* 48 */
	
};

/* isakmp->np */
static const u_char *(*npfunc[])(netdissect_options *ndo, u_char tpay, 
				 const struct isakmp_gen *ext,
				 u_int item_len,
				 const u_char *end_pointer,
				 u_int32_t phase,
				 u_int32_t doi0,
				 u_int32_t proto0, int depth) = {
	NULL,
	ikev1_sa_print,
	ikev1_p_print,
	ikev1_t_print,
	ikev1_ke_print,
	ikev1_id_print,
	ikev1_cert_print,
	ikev1_cr_print,
	ikev1_hash_print,
	ikev1_sig_print,
	ikev1_nonce_print,
	ikev1_n_print,
	ikev1_d_print,
	ikev1_vid_print,                  /* 13 */
	NULL, NULL, NULL, NULL, NULL,     /* 14- 18 */
	NULL, NULL, NULL, NULL, NULL,     /* 19- 23 */
	NULL, NULL, NULL, NULL, NULL,     /* 24- 28 */
	NULL, NULL, NULL, NULL,           /* 29- 32 */
	ikev2_sa_print,                 /* 33 */
	ikev2_ke_print,                 /* 34 */
	ikev2_ID_print,                 /* 35 */
	ikev2_ID_print,                 /* 36 */
	ikev2_cert_print,               /* 37 */
	ikev2_cr_print,                 /* 38 */
	ikev2_auth_print,               /* 39 */
	ikev2_nonce_print,              /* 40 */
	ikev2_n_print,                  /* 41 */
	ikev2_d_print,                  /* 42 */
	ikev2_vid_print,                /* 43 */
	ikev2_TS_print,                 /* 44 */
	ikev2_TS_print,                 /* 45 */
	ikev2_e_print,                  /* 46 */
	ikev2_cp_print,                 /* 47 */
	ikev2_eap_print,                /* 48 */
};

/* isakmp->etype */
static const char *etypestr[] = {
/* IKEv1 exchange types */
	"none", "base", "ident", "auth", "agg", "inf", NULL, NULL,  /* 0-7 */
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,  /*  8-15 */
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,  /* 16-23 */
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,  /* 24-31 */
	"oakley-quick", "oakley-newgroup",               /* 32-33 */
/* IKEv2 exchange types */
	"ikev2_init", "ikev2_auth", "child_sa", "inf2"   /* 34-37 */
};

#define STR_OR_ID(x, tab) \
	(((x) < sizeof(tab)/sizeof(tab[0]) && tab[(x)])	? tab[(x)] : numstr(x))
#define PROTOIDSTR(x)	STR_OR_ID(x, protoidstr)
#define NPSTR(x)	STR_OR_ID(x, npstr)
#define ETYPESTR(x)	STR_OR_ID(x, etypestr)

#define CHECKLEN(p, np)							\
		if (ep < (u_char *)(p)) {				\
			ND_PRINT((ndo," [|%s]", NPSTR(np)));		\
			goto done;					\
		}
		

#define NPFUNC(x) \
	(((x) < sizeof(npfunc)/sizeof(npfunc[0]) && npfunc[(x)]) \
		? npfunc[(x)] : NULL)

static int
iszero(u_char *p, size_t l)
{
	while (l--) {
		if (*p++)
			return 0;
	}
	return 1;
}

/* find cookie from initiator cache */
static int
cookie_find(cookie_t *in)
{
	int i;

	for (i = 0; i < MAXINITIATORS; i++) {
		if (memcmp(in, &cookiecache[i].initiator, sizeof(*in)) == 0)
			return i;
	}

	return -1;
}

/* record initiator */
static void
cookie_record(cookie_t *in, const u_char *bp2)
{
	int i;
	struct ip *ip;
	struct sockaddr_in *sin;
#ifdef INET6
	struct ip6_hdr *ip6;
	struct sockaddr_in6 *sin6;
#endif

	i = cookie_find(in);
	if (0 <= i) {
		ninitiator = (i + 1) % MAXINITIATORS;
		return;
	}

	ip = (struct ip *)bp2;
	switch (IP_V(ip)) {
	case 4:
		memset(&cookiecache[ninitiator].iaddr, 0,
			sizeof(cookiecache[ninitiator].iaddr));
		memset(&cookiecache[ninitiator].raddr, 0,
			sizeof(cookiecache[ninitiator].raddr));

		sin = (struct sockaddr_in *)&cookiecache[ninitiator].iaddr;
#ifdef HAVE_SOCKADDR_SA_LEN
		sin->sin_len = sizeof(struct sockaddr_in);
#endif
		sin->sin_family = AF_INET;
		memcpy(&sin->sin_addr, &ip->ip_src, sizeof(ip->ip_src));
		sin = (struct sockaddr_in *)&cookiecache[ninitiator].raddr;
#ifdef HAVE_SOCKADDR_SA_LEN
		sin->sin_len = sizeof(struct sockaddr_in);
#endif
		sin->sin_family = AF_INET;
		memcpy(&sin->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst));
		break;
#ifdef INET6
	case 6:
		memset(&cookiecache[ninitiator].iaddr, 0,
			sizeof(cookiecache[ninitiator].iaddr));
		memset(&cookiecache[ninitiator].raddr, 0,
			sizeof(cookiecache[ninitiator].raddr));

		ip6 = (struct ip6_hdr *)bp2;
		sin6 = (struct sockaddr_in6 *)&cookiecache[ninitiator].iaddr;
#ifdef HAVE_SOCKADDR_SA_LEN
		sin6->sin6_len = sizeof(struct sockaddr_in6);
#endif
		sin6->sin6_family = AF_INET6;
		memcpy(&sin6->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src));
		sin6 = (struct sockaddr_in6 *)&cookiecache[ninitiator].raddr;
#ifdef HAVE_SOCKADDR_SA_LEN
		sin6->sin6_len = sizeof(struct sockaddr_in6);
#endif
		sin6->sin6_family = AF_INET6;
		memcpy(&sin6->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst));
		break;
#endif
	default:
		return;
	}
	memcpy(&cookiecache[ninitiator].initiator, in, sizeof(*in));
	ninitiator = (ninitiator + 1) % MAXINITIATORS;
}

#define cookie_isinitiator(x, y)	cookie_sidecheck((x), (y), 1)
#define cookie_isresponder(x, y)	cookie_sidecheck((x), (y), 0)
static int
cookie_sidecheck(int i, const u_char *bp2, int initiator)
{
	struct sockaddr_storage ss;
	struct sockaddr *sa;
	struct ip *ip;
	struct sockaddr_in *sin;
#ifdef INET6
	struct ip6_hdr *ip6;
	struct sockaddr_in6 *sin6;
#endif
	int salen;

	memset(&ss, 0, sizeof(ss));
	ip = (struct ip *)bp2;
	switch (IP_V(ip)) {
	case 4:
		sin = (struct sockaddr_in *)&ss;
#ifdef HAVE_SOCKADDR_SA_LEN
		sin->sin_len = sizeof(struct sockaddr_in);
#endif
		sin->sin_family = AF_INET;
		memcpy(&sin->sin_addr, &ip->ip_src, sizeof(ip->ip_src));
		break;
#ifdef INET6
	case 6:
		ip6 = (struct ip6_hdr *)bp2;
		sin6 = (struct sockaddr_in6 *)&ss;
#ifdef HAVE_SOCKADDR_SA_LEN
		sin6->sin6_len = sizeof(struct sockaddr_in6);
#endif
		sin6->sin6_family = AF_INET6;
		memcpy(&sin6->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src));
		break;
#endif
	default:
		return 0;
	}

	sa = (struct sockaddr *)&ss;
	if (initiator) {
		if (sa->sa_family != ((struct sockaddr *)&cookiecache[i].iaddr)->sa_family)
			return 0;
#ifdef HAVE_SOCKADDR_SA_LEN
		salen = sa->sa_len;
#else
#ifdef INET6
		if (sa->sa_family == AF_INET6)
			salen = sizeof(struct sockaddr_in6);
		else
			salen = sizeof(struct sockaddr);
#else
		salen = sizeof(struct sockaddr);
#endif
#endif
		if (memcmp(&ss, &cookiecache[i].iaddr, salen) == 0)
			return 1;
	} else {
		if (sa->sa_family != ((struct sockaddr *)&cookiecache[i].raddr)->sa_family)
			return 0;
#ifdef HAVE_SOCKADDR_SA_LEN
		salen = sa->sa_len;
#else
#ifdef INET6
		if (sa->sa_family == AF_INET6)
			salen = sizeof(struct sockaddr_in6);
		else
			salen = sizeof(struct sockaddr);
#else
		salen = sizeof(struct sockaddr);
#endif
#endif
		if (memcmp(&ss, &cookiecache[i].raddr, salen) == 0)
			return 1;
	}
	return 0;
}

static int
rawprint(netdissect_options *ndo, caddr_t loc, size_t len)
{
	static u_char *p;
	size_t i;

	ND_TCHECK2(*loc, len);
	
	p = (u_char *)loc;
	for (i = 0; i < len; i++)
		ND_PRINT((ndo,"%02x", p[i] & 0xff));
	return 1;
trunc:
	return 0;
}

/*
 * returns false if we run out of data buffer
 */
static int ike_show_somedata(struct netdissect_options *ndo,
			     const u_char *cp, const u_char *ep)
{
	/* there is too much data, just show some of it */
	const u_char *end = ep - 20;
	int  elen = 20;
	int   len = ep - cp;
	if(len > 10) {
		len = 10;
	}
	
	/* really shouldn't happen because of above */
	if(end < cp + len) {
		end = cp+len;
		elen = ep - end;
	}
	
	ND_PRINT((ndo," data=("));
	if(!rawprint(ndo, (caddr_t)(cp), len)) goto trunc;
	ND_PRINT((ndo, "..."));
	if(elen) {
		if(!rawprint(ndo, (caddr_t)(end), elen)) goto trunc;
	}
	ND_PRINT((ndo,")"));
	return 1;

trunc:
	return 0;
}

struct attrmap {
	const char *type;
	u_int nvalue;
	const char *value[30];	/*XXX*/
};

static const u_char *
ikev1_attrmap_print(netdissect_options *ndo,
		    const u_char *p, const u_char *ep,
		    const struct attrmap *map, size_t nmap)
{
	u_int16_t *q;
	int totlen;
	u_int32_t t, v;

	q = (u_int16_t *)p;
	if (p[0] & 0x80)
		totlen = 4;
	else
		totlen = 4 + EXTRACT_16BITS(&q[1]);
	if (ep < p + totlen) {
		ND_PRINT((ndo,"[|attr]"));
		return ep + 1;
	}

	ND_PRINT((ndo,"("));
	t = EXTRACT_16BITS(&q[0]) & 0x7fff;
	if (map && t < nmap && map[t].type)
		ND_PRINT((ndo,"type=%s ", map[t].type));
	else
		ND_PRINT((ndo,"type=#%d ", t));
	if (p[0] & 0x80) {
		ND_PRINT((ndo,"value="));
		v = EXTRACT_16BITS(&q[1]);
		if (map && t < nmap && v < map[t].nvalue && map[t].value[v])
			ND_PRINT((ndo,"%s", map[t].value[v]));
		else
			rawprint(ndo, (caddr_t)&q[1], 2);
	} else {
		ND_PRINT((ndo,"len=%d value=", EXTRACT_16BITS(&q[1])));
		rawprint(ndo, (caddr_t)&p[4], EXTRACT_16BITS(&q[1]));
	}
	ND_PRINT((ndo,")"));
	return p + totlen;
}

static const u_char *
ikev1_attr_print(netdissect_options *ndo, const u_char *p, const u_char *ep)
{
	u_int16_t *q;
	int totlen;
	u_int32_t t;

	q = (u_int16_t *)p;
	if (p[0] & 0x80)
		totlen = 4;
	else
		totlen = 4 + EXTRACT_16BITS(&q[1]);
	if (ep < p + totlen) {
		ND_PRINT((ndo,"[|attr]"));
		return ep + 1;
	}

	ND_PRINT((ndo,"("));
	t = EXTRACT_16BITS(&q[0]) & 0x7fff;
	ND_PRINT((ndo,"type=#%d ", t));
	if (p[0] & 0x80) {
		ND_PRINT((ndo,"value="));
		t = q[1];
		rawprint(ndo, (caddr_t)&q[1], 2);
	} else {
		ND_PRINT((ndo,"len=%d value=", EXTRACT_16BITS(&q[1])));
		rawprint(ndo, (caddr_t)&p[2], EXTRACT_16BITS(&q[1]));
	}
	ND_PRINT((ndo,")"));
	return p + totlen;
}

static const u_char *
ikev1_sa_print(netdissect_options *ndo, u_char tpay _U_,
	       const struct isakmp_gen *ext,
		u_int item_len _U_,
		const u_char *ep, u_int32_t phase, u_int32_t doi0 _U_,
		u_int32_t proto0, int depth)
{
	const struct ikev1_pl_sa *p;
	struct ikev1_pl_sa sa;
	const u_int32_t *q;
	u_int32_t doi, sit, ident;
	const u_char *cp, *np;
	int t;

	ND_PRINT((ndo,"%s:", NPSTR(ISAKMP_NPTYPE_SA)));

	p = (struct ikev1_pl_sa *)ext;
	ND_TCHECK(*p);
	safememcpy(&sa, ext, sizeof(sa));
	doi = ntohl(sa.doi);
	sit = ntohl(sa.sit);
	if (doi != 1) {
		ND_PRINT((ndo," doi=%d", doi));
		ND_PRINT((ndo," situation=%u", (u_int32_t)ntohl(sa.sit)));
		return (u_char *)(p + 1);
	}

	ND_PRINT((ndo," doi=ipsec"));
	q = (u_int32_t *)&sa.sit;
	ND_PRINT((ndo," situation="));
	t = 0;
	if (sit & 0x01) {
		ND_PRINT((ndo,"identity"));
		t++;
	}
	if (sit & 0x02) {
		ND_PRINT((ndo,"%ssecrecy", t ? "+" : ""));
		t++;
	}
	if (sit & 0x04)
		ND_PRINT((ndo,"%sintegrity", t ? "+" : ""));

	np = (u_char *)ext + sizeof(sa);
	if (sit != 0x01) {
		ND_TCHECK2(*(ext + 1), sizeof(ident));
		safememcpy(&ident, ext + 1, sizeof(ident));
		ND_PRINT((ndo," ident=%u", (u_int32_t)ntohl(ident)));
		np += sizeof(ident);
	}

	ext = (struct isakmp_gen *)np;
	ND_TCHECK(*ext);

	cp = ikev1_sub_print(ndo, ISAKMP_NPTYPE_P, ext, ep, phase, doi, proto0,
		depth);

	return cp;
trunc:
	ND_PRINT((ndo," [|%s]", NPSTR(ISAKMP_NPTYPE_SA)));
	return NULL;
}

static const u_char *
ikev1_p_print(netdissect_options *ndo, u_char tpay _U_,
	      const struct isakmp_gen *ext, u_int item_len _U_,
	       const u_char *ep, u_int32_t phase, u_int32_t doi0,
	       u_int32_t proto0 _U_, int depth)
{
	const struct ikev1_pl_p *p;
	struct ikev1_pl_p prop;
	const u_char *cp;

	ND_PRINT((ndo,"%s:", NPSTR(ISAKMP_NPTYPE_P)));

	p = (struct ikev1_pl_p *)ext;
	ND_TCHECK(*p);
	safememcpy(&prop, ext, sizeof(prop));
	ND_PRINT((ndo," #%d protoid=%s transform=%d",
		  prop.p_no, PROTOIDSTR(prop.prot_id), prop.num_t));
	if (prop.spi_size) {
		ND_PRINT((ndo," spi="));