1 /* $NetBSD: print-ah.c,v 1.4 1996/05/20 00:41:16 fvdl Exp $ */
4 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that: (1) source code distributions
9 * retain the above copyright notice and this paragraph in its entirety, (2)
10 * distributions including binary code include the above copyright notice and
11 * this paragraph in its entirety in the documentation or other materials
12 * provided with the distribution, and (3) all advertising materials mentioning
13 * features or use of this software display the following acknowledgement:
14 * ``This product includes software developed by the University of California,
15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16 * the University nor the names of its contributors may be used to endorse
17 * or promote products derived from this software without specific prior
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
24 #define NETDISSECT_REWORKED
29 #include <tcpdump-stdinc.h>
34 /* Any code in this file that depends on HAVE_LIBCRYPTO depends on
35 * HAVE_OPENSSL_EVP_H too. Undefining the former when the latter isn't defined
36 * is the simplest way of handling the dependency.
39 #ifdef HAVE_OPENSSL_EVP_H
40 #include <openssl/evp.h>
51 #include "interface.h"
55 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
56 * All rights reserved.
58 * Redistribution and use in source and binary forms, with or without
59 * modification, are permitted provided that the following conditions
61 * 1. Redistributions of source code must retain the above copyright
62 * notice, this list of conditions and the following disclaimer.
63 * 2. Redistributions in binary form must reproduce the above copyright
64 * notice, this list of conditions and the following disclaimer in the
65 * documentation and/or other materials provided with the distribution.
66 * 3. Neither the name of the project nor the names of its contributors
67 * may be used to endorse or promote products derived from this software
68 * without specific prior written permission.
70 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
71 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
72 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
73 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
74 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
75 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
76 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
77 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
78 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
79 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
84 * RFC1827/2406 Encapsulated Security Payload.
88 uint32_t esp_spi; /* ESP */
89 uint32_t esp_seq; /* Sequence number */
90 /*variable size*/ /* (IV and) Payload data */
91 /*variable size*/ /* padding */
92 /*8bit*/ /* pad size */
93 /*8bit*/ /* next header */
94 /*8bit*/ /* next header */
95 /*variable size, 32bit bound*/ /* Authentication data */
106 struct sa_list *next;
108 union inaddr_u daddr;
109 uint32_t spi; /* if == 0, then IKEv2 */
111 u_char spii[8]; /* for IKEv2 */
113 const EVP_CIPHER *evp;
116 u_char authsecret[256];
118 u_char secret[256]; /* is that big enough for all secrets? */
123 * this will adjust ndo_packetp and ndo_snapend to new buffer!
125 USES_APPLE_DEPRECATED_API
126 int esp_print_decrypt_buffer_by_ikev2(netdissect_options *ndo,
128 u_char spii[8], u_char spir[8],
129 u_char *buf, u_char *end)
136 /* initiator arg is any non-zero value */
137 if(initiator) initiator=1;
139 /* see if we can find the SA, and if so, decode it */
140 for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) {
142 && initiator == sa->initiator
143 && memcmp(spii, sa->spii, 8) == 0
144 && memcmp(spir, sa->spir, 8) == 0)
148 if(sa == NULL) return 0;
149 if(sa->evp == NULL) return 0;
152 * remove authenticator, and see if we still have something to
155 end = end - sa->authlen;
157 buf = buf + sa->ivlen;
160 if(end <= buf) return 0;
162 memset(&ctx, 0, sizeof(ctx));
163 if (EVP_CipherInit(&ctx, sa->evp, sa->secret, NULL, 0) < 0)
164 (*ndo->ndo_warning)(ndo, "espkey init failed");
165 EVP_CipherInit(&ctx, NULL, NULL, iv, 0);
166 EVP_Cipher(&ctx, buf, buf, len);
167 EVP_CIPHER_CTX_cleanup(&ctx);
169 ndo->ndo_packetp = buf;
170 ndo->ndo_snapend = end;
177 static void esp_print_addsa(netdissect_options *ndo,
178 struct sa_list *sa, int sa_def)
184 nsa = (struct sa_list *)malloc(sizeof(struct sa_list));
186 (*ndo->ndo_error)(ndo, "ran out of memory to allocate sa structure");
191 ndo->ndo_sa_default = nsa;
193 nsa->next = ndo->ndo_sa_list_head;
194 ndo->ndo_sa_list_head = nsa;
198 static u_int hexdigit(netdissect_options *ndo, char hex)
200 if (hex >= '0' && hex <= '9')
202 else if (hex >= 'A' && hex <= 'F')
203 return (hex - 'A' + 10);
204 else if (hex >= 'a' && hex <= 'f')
205 return (hex - 'a' + 10);
207 (*ndo->ndo_error)(ndo, "invalid hex digit %c in espsecret\n", hex);
212 static u_int hex2byte(netdissect_options *ndo, char *hexstring)
216 byte = (hexdigit(ndo, hexstring[0]) << 4) + hexdigit(ndo, hexstring[1]);
221 * returns size of binary, 0 on failure.
224 int espprint_decode_hex(netdissect_options *ndo,
225 u_char *binbuf, unsigned int binbuf_len,
231 len = strlen(hex) / 2;
233 if (len > binbuf_len) {
234 (*ndo->ndo_warning)(ndo, "secret is too big: %d\n", len);
239 while (hex[0] != '\0' && hex[1]!='\0') {
240 binbuf[i] = hex2byte(ndo, hex);
249 * decode the form: SPINUM@IP <tab> ALGONAME:0xsecret
252 USES_APPLE_DEPRECATED_API
254 espprint_decode_encalgo(netdissect_options *ndo,
255 char *decode, struct sa_list *sa)
258 const EVP_CIPHER *evp;
262 colon = strchr(decode, ':');
264 (*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode);
269 if (strlen(decode) > strlen("-hmac96") &&
270 !strcmp(decode + strlen(decode) - strlen("-hmac96"),
272 p = strstr(decode, "-hmac96");
276 if (strlen(decode) > strlen("-cbc") &&
277 !strcmp(decode + strlen(decode) - strlen("-cbc"), "-cbc")) {
278 p = strstr(decode, "-cbc");
281 evp = EVP_get_cipherbyname(decode);
284 (*ndo->ndo_warning)(ndo, "failed to find cipher algo %s\n", decode);
292 sa->authlen = authlen;
293 sa->ivlen = EVP_CIPHER_iv_length(evp);
296 if (colon[0] == '0' && colon[1] == 'x') {
297 /* decode some hex! */
300 sa->secretlen = espprint_decode_hex(ndo, sa->secret, sizeof(sa->secret), colon);
301 if(sa->secretlen == 0) return 0;
305 if (i < sizeof(sa->secret)) {
306 memcpy(sa->secret, colon, i);
309 memcpy(sa->secret, colon, sizeof(sa->secret));
310 sa->secretlen = sizeof(sa->secret);
319 * for the moment, ignore the auth algorith, just hard code the authenticator
320 * length. Need to research how openssl looks up HMAC stuff.
323 espprint_decode_authalgo(netdissect_options *ndo,
324 char *decode, struct sa_list *sa)
328 colon = strchr(decode, ':');
330 (*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode);
335 if(strcasecmp(colon,"sha1") == 0 ||
336 strcasecmp(colon,"md5") == 0) {
342 static void esp_print_decode_ikeline(netdissect_options *ndo, char *line,
343 const char *file, int lineno)
345 /* it's an IKEv2 secret, store it instead */
349 char *icookie, *rcookie;
354 init = strsep(&line, " \t");
355 icookie = strsep(&line, " \t");
356 rcookie = strsep(&line, " \t");
357 authkey = strsep(&line, " \t");
358 enckey = strsep(&line, " \t");
360 /* if any fields are missing */
361 if(!init || !icookie || !rcookie || !authkey || !enckey) {
362 (*ndo->ndo_warning)(ndo, "print_esp: failed to find all fields for ikev2 at %s:%u",
368 ilen = strlen(icookie);
369 rlen = strlen(rcookie);
371 if((init[0]!='I' && init[0]!='R')
372 || icookie[0]!='0' || icookie[1]!='x'
373 || rcookie[0]!='0' || rcookie[1]!='x'
376 (*ndo->ndo_warning)(ndo, "print_esp: line %s:%u improperly formatted.",
379 (*ndo->ndo_warning)(ndo, "init=%s icookie=%s(%u) rcookie=%s(%u)",
380 init, icookie, ilen, rcookie, rlen);
386 sa1.initiator = (init[0] == 'I');
387 if(espprint_decode_hex(ndo, sa1.spii, sizeof(sa1.spii), icookie+2)!=8)
390 if(espprint_decode_hex(ndo, sa1.spir, sizeof(sa1.spir), rcookie+2)!=8)
393 if(!espprint_decode_encalgo(ndo, enckey, &sa1)) return;
395 if(!espprint_decode_authalgo(ndo, authkey, &sa1)) return;
397 esp_print_addsa(ndo, &sa1, FALSE);
402 * special form: file /name
403 * causes us to go read from this file instead.
406 static void esp_print_decode_onesecret(netdissect_options *ndo, char *line,
407 const char *file, int lineno)
415 spikey = strsep(&line, " \t");
417 memset(&sa1, 0, sizeof(struct sa_list));
419 /* if there is only one token, then it is an algo:key token */
423 /* sa1.daddr.version = 0; */
424 /* memset(&sa1.daddr, 0, sizeof(sa1.daddr)); */
430 if (spikey && strcasecmp(spikey, "file") == 0) {
431 /* open file and read it */
436 char *filename = line;
438 secretfile = fopen(filename, FOPEN_READ_TXT);
439 if (secretfile == NULL) {
444 while (fgets(fileline, sizeof(fileline)-1, secretfile) != NULL) {
446 /* remove newline from the line */
447 nl = strchr(fileline, '\n');
450 if (fileline[0] == '#') continue;
451 if (fileline[0] == '\0') continue;
453 esp_print_decode_onesecret(ndo, fileline, filename, lineno);
460 if (spikey && strcasecmp(spikey, "ikev2") == 0) {
461 esp_print_decode_ikeline(ndo, line, file, lineno);
470 spistr = strsep(&spikey, "@");
472 spino = strtoul(spistr, &foo, 0);
473 if (spistr == foo || !spikey) {
474 (*ndo->ndo_warning)(ndo, "print_esp: failed to decode spi# %s\n", foo);
481 if (inet_pton(AF_INET6, spikey, &sa1.daddr.in6) == 1) {
482 sa1.daddr_version = 6;
485 if (inet_pton(AF_INET, spikey, &sa1.daddr.in4) == 1) {
486 sa1.daddr_version = 4;
488 (*ndo->ndo_warning)(ndo, "print_esp: can not decode IP# %s\n", spikey);
494 /* skip any blank spaces */
495 while (isspace((unsigned char)*decode))
498 if(!espprint_decode_encalgo(ndo, decode, &sa1)) {
503 esp_print_addsa(ndo, &sa1, sa_def);
506 USES_APPLE_DEPRECATED_API
507 static void esp_init(netdissect_options *ndo _U_)
510 OpenSSL_add_all_algorithms();
511 EVP_add_cipher_alias(SN_des_ede3_cbc, "3des");
515 void esp_print_decodesecret(netdissect_options *ndo)
519 static int initialized = 0;
526 p = ndo->ndo_espsecret;
528 while (p && p[0] != '\0') {
529 /* pick out the first line or first thing until a comma */
530 if ((line = strsep(&p, "\n,")) == NULL) {
535 esp_print_decode_onesecret(ndo, line, "cmdline", 0);
538 ndo->ndo_espsecret = NULL;
543 #ifdef HAVE_LIBCRYPTO
544 USES_APPLE_DEPRECATED_API
547 esp_print(netdissect_options *ndo,
548 const u_char *bp, const int length, const u_char *bp2
549 #ifndef HAVE_LIBCRYPTO
554 #ifndef HAVE_LIBCRYPTO
559 #ifndef HAVE_LIBCRYPTO
564 register const struct newesp *esp;
565 register const u_char *ep;
566 #ifdef HAVE_LIBCRYPTO
568 struct sa_list *sa = NULL;
570 struct ip6_hdr *ip6 = NULL;
581 esp = (struct newesp *)bp;
583 #ifdef HAVE_LIBCRYPTO
589 /* keep secret out of a register */
590 p = (u_char *)&secret;
593 /* 'ep' points to the end of available data. */
594 ep = ndo->ndo_snapend;
596 if ((u_char *)(esp + 1) >= ep) {
597 ND_PRINT((ndo, "[|ESP]"));
600 ND_PRINT((ndo, "ESP(spi=0x%08x", EXTRACT_32BITS(&esp->esp_spi)));
601 ND_PRINT((ndo, ",seq=0x%x)", EXTRACT_32BITS(&esp->esp_seq)));
602 ND_PRINT((ndo, ", length %u", length));
604 #ifndef HAVE_LIBCRYPTO
607 /* initiailize SAs */
608 if (ndo->ndo_sa_list_head == NULL) {
609 if (!ndo->ndo_espsecret)
612 esp_print_decodesecret(ndo);
615 if (ndo->ndo_sa_list_head == NULL)
618 ip = (struct ip *)bp2;
622 ip6 = (struct ip6_hdr *)bp2;
623 /* we do not attempt to decrypt jumbograms */
624 if (!EXTRACT_16BITS(&ip6->ip6_plen))
626 /* if we can't get nexthdr, we do not need to decrypt it */
627 len = sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen);
629 /* see if we can find the SA, and if so, decode it */
630 for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) {
631 if (sa->spi == EXTRACT_32BITS(&esp->esp_spi) &&
632 sa->daddr_version == 6 &&
633 UNALIGNED_MEMCMP(&sa->daddr.in6, &ip6->ip6_dst,
634 sizeof(struct in6_addr)) == 0) {
641 /* nexthdr & padding are in the last fragment */
642 if (EXTRACT_16BITS(&ip->ip_off) & IP_MF)
644 len = EXTRACT_16BITS(&ip->ip_len);
646 /* see if we can find the SA, and if so, decode it */
647 for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) {
648 if (sa->spi == EXTRACT_32BITS(&esp->esp_spi) &&
649 sa->daddr_version == 4 &&
650 UNALIGNED_MEMCMP(&sa->daddr.in4, &ip->ip_dst,
651 sizeof(struct in_addr)) == 0) {
660 /* if we didn't find the specific one, then look for
661 * an unspecified one.
664 sa = ndo->ndo_sa_default;
666 /* if not found fail */
670 /* if we can't get nexthdr, we do not need to decrypt it */
673 if (ep - bp2 > len) {
674 /* FCS included at end of frame (NetBSD 1.6 or later) */
678 ivoff = (u_char *)(esp + 1) + 0;
681 ep = ep - sa->authlen;
684 memset(&ctx, 0, sizeof(ctx));
685 if (EVP_CipherInit(&ctx, sa->evp, secret, NULL, 0) < 0)
686 (*ndo->ndo_warning)(ndo, "espkey init failed");
689 EVP_CipherInit(&ctx, NULL, NULL, p, 0);
690 EVP_Cipher(&ctx, p + ivlen, p + ivlen, ep - (p + ivlen));
691 EVP_CIPHER_CTX_cleanup(&ctx);
692 advance = ivoff - (u_char *)esp + ivlen;
694 advance = sizeof(struct newesp);
696 /* sanity check for pad length */
697 if (ep - bp < *(ep - 2))
701 *padlen = *(ep - 2) + 2;
706 ND_PRINT((ndo, ": "));
713 #ifdef HAVE_LIBCRYPTO
719 * c-style: whitesmith