mirror of
https://github.com/the-tcpdump-group/tcpdump.git
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e8b5237589
Use the EXTRACT_ macros to extract multi-byte integral values from packets, rather than just dereferencing pointers into the packet; there is no guarantee that the packet data will be aligned on the right boundary, and there is no guarantee that, if they're not, a direct access will work correctly.
695 lines
15 KiB
C
695 lines
15 KiB
C
/* $NetBSD: print-ah.c,v 1.4 1996/05/20 00:41:16 fvdl Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.58 2007-12-07 00:03:07 mcr Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <tcpdump-stdinc.h>
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#include <stdlib.h>
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#ifdef HAVE_LIBCRYPTO
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#ifdef HAVE_OPENSSL_EVP_H
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#include <openssl/evp.h>
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#endif
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#endif
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#include <stdio.h>
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#include "ip.h"
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#include "esp.h"
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#ifdef INET6
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#include "ip6.h"
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#endif
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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#ifndef HAVE_SOCKADDR_STORAGE
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#ifdef INET6
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struct sockaddr_storage {
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union {
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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} un;
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};
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#else
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#define sockaddr_storage sockaddr
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#endif
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#endif /* HAVE_SOCKADDR_STORAGE */
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#ifdef HAVE_LIBCRYPTO
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struct sa_list {
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struct sa_list *next;
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struct sockaddr_storage daddr;
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u_int32_t spi; /* if == 0, then IKEv2 */
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int initiator;
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u_char spii[8]; /* for IKEv2 */
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u_char spir[8];
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const EVP_CIPHER *evp;
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int ivlen;
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int authlen;
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u_char authsecret[256];
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int authsecret_len;
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u_char secret[256]; /* is that big enough for all secrets? */
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int secretlen;
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};
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/*
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* this will adjust ndo_packetp and ndo_snapend to new buffer!
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*/
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int esp_print_decrypt_buffer_by_ikev2(netdissect_options *ndo,
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int initiator,
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u_char spii[8], u_char spir[8],
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u_char *buf, u_char *end)
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{
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struct sa_list *sa;
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u_char *iv;
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int len;
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EVP_CIPHER_CTX ctx;
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/* initiator arg is any non-zero value */
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if(initiator) initiator=1;
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/* see if we can find the SA, and if so, decode it */
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for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) {
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if (sa->spi == 0
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&& initiator == sa->initiator
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&& memcmp(spii, sa->spii, 8) == 0
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&& memcmp(spir, sa->spir, 8) == 0)
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break;
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}
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if(sa == NULL) return 0;
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if(sa->evp == NULL) return 0;
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/*
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* remove authenticator, and see if we still have something to
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* work with
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*/
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end = end - sa->authlen;
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iv = buf;
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buf = buf + sa->ivlen;
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len = end-buf;
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if(end <= buf) return 0;
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memset(&ctx, 0, sizeof(ctx));
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if (EVP_CipherInit(&ctx, sa->evp, sa->secret, NULL, 0) < 0)
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(*ndo->ndo_warning)(ndo, "espkey init failed");
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EVP_CipherInit(&ctx, NULL, NULL, iv, 0);
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EVP_Cipher(&ctx, buf, buf, len);
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EVP_CIPHER_CTX_cleanup(&ctx);
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ndo->ndo_packetp = buf;
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ndo->ndo_snapend = end;
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return 1;
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}
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static void esp_print_addsa(netdissect_options *ndo,
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struct sa_list *sa, int sa_def)
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{
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/* copy the "sa" */
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struct sa_list *nsa;
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nsa = (struct sa_list *)malloc(sizeof(struct sa_list));
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if (nsa == NULL)
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(*ndo->ndo_error)(ndo, "ran out of memory to allocate sa structure");
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*nsa = *sa;
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if (sa_def)
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ndo->ndo_sa_default = nsa;
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nsa->next = ndo->ndo_sa_list_head;
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ndo->ndo_sa_list_head = nsa;
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}
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static u_int hexdigit(netdissect_options *ndo, char hex)
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{
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if (hex >= '0' && hex <= '9')
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return (hex - '0');
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else if (hex >= 'A' && hex <= 'F')
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return (hex - 'A' + 10);
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else if (hex >= 'a' && hex <= 'f')
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return (hex - 'a' + 10);
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else {
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(*ndo->ndo_error)(ndo, "invalid hex digit %c in espsecret\n", hex);
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return 0;
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}
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}
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static u_int hex2byte(netdissect_options *ndo, char *hexstring)
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{
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u_int byte;
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byte = (hexdigit(ndo, hexstring[0]) << 4) + hexdigit(ndo, hexstring[1]);
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return byte;
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}
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/*
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* returns size of binary, 0 on failure.
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*/
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static
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int espprint_decode_hex(netdissect_options *ndo,
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u_char *binbuf, unsigned int binbuf_len,
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char *hex)
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{
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unsigned int len;
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int i;
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len = strlen(hex) / 2;
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if (len > binbuf_len) {
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(*ndo->ndo_warning)(ndo, "secret is too big: %d\n", len);
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return 0;
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}
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i = 0;
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while (hex[0] != '\0' && hex[1]!='\0') {
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binbuf[i] = hex2byte(ndo, hex);
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hex += 2;
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i++;
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}
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return i;
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}
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/*
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* decode the form: SPINUM@IP <tab> ALGONAME:0xsecret
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*/
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static int
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espprint_decode_encalgo(netdissect_options *ndo,
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char *decode, struct sa_list *sa)
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{
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int len;
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size_t i;
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const EVP_CIPHER *evp;
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int authlen = 0;
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char *colon, *p;
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colon = strchr(decode, ':');
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if (colon == NULL) {
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(*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode);
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return 0;
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}
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*colon = '\0';
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len = colon - decode;
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if (strlen(decode) > strlen("-hmac96") &&
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!strcmp(decode + strlen(decode) - strlen("-hmac96"),
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"-hmac96")) {
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p = strstr(decode, "-hmac96");
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*p = '\0';
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authlen = 12;
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}
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if (strlen(decode) > strlen("-cbc") &&
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!strcmp(decode + strlen(decode) - strlen("-cbc"), "-cbc")) {
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p = strstr(decode, "-cbc");
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*p = '\0';
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}
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evp = EVP_get_cipherbyname(decode);
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if (!evp) {
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(*ndo->ndo_warning)(ndo, "failed to find cipher algo %s\n", decode);
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sa->evp = NULL;
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sa->authlen = 0;
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sa->ivlen = 0;
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return 0;
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}
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sa->evp = evp;
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sa->authlen = authlen;
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sa->ivlen = EVP_CIPHER_iv_length(evp);
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colon++;
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if (colon[0] == '0' && colon[1] == 'x') {
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/* decode some hex! */
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colon += 2;
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sa->secretlen = espprint_decode_hex(ndo, sa->secret, sizeof(sa->secret), colon);
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if(sa->secretlen == 0) return 0;
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} else {
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i = strlen(colon);
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if (i < sizeof(sa->secret)) {
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memcpy(sa->secret, colon, i);
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sa->secretlen = i;
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} else {
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memcpy(sa->secret, colon, sizeof(sa->secret));
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sa->secretlen = sizeof(sa->secret);
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}
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}
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return 1;
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}
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/*
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* for the moment, ignore the auth algorith, just hard code the authenticator
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* length. Need to research how openssl looks up HMAC stuff.
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*/
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static int
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espprint_decode_authalgo(netdissect_options *ndo,
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char *decode, struct sa_list *sa)
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{
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char *colon;
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colon = strchr(decode, ':');
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if (colon == NULL) {
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(*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode);
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return 0;
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}
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*colon = '\0';
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if(strcasecmp(colon,"sha1") == 0 ||
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strcasecmp(colon,"md5") == 0) {
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sa->authlen = 12;
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}
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return 1;
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}
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static void esp_print_decode_ikeline(netdissect_options *ndo, char *line,
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const char *file, int lineno)
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{
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/* it's an IKEv2 secret, store it instead */
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struct sa_list sa1;
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char *init;
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char *icookie, *rcookie;
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int ilen, rlen;
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char *authkey;
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char *enckey;
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init = strsep(&line, " \t");
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icookie = strsep(&line, " \t");
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rcookie = strsep(&line, " \t");
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authkey = strsep(&line, " \t");
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enckey = strsep(&line, " \t");
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/* if any fields are missing */
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if(!init || !icookie || !rcookie || !authkey || !enckey) {
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(*ndo->ndo_warning)(ndo, "print_esp: failed to find all fields for ikev2 at %s:%u",
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file, lineno);
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return;
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}
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ilen = strlen(icookie);
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rlen = strlen(rcookie);
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if((init[0]!='I' && init[0]!='R')
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|| icookie[0]!='0' || icookie[1]!='x'
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|| rcookie[0]!='0' || rcookie[1]!='x'
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|| ilen!=18
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|| rlen!=18) {
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(*ndo->ndo_warning)(ndo, "print_esp: line %s:%u improperly formatted.",
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file, lineno);
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(*ndo->ndo_warning)(ndo, "init=%s icookie=%s(%u) rcookie=%s(%u)",
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init, icookie, ilen, rcookie, rlen);
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return;
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}
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sa1.spi = 0;
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sa1.initiator = (init[0] == 'I');
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if(espprint_decode_hex(ndo, sa1.spii, sizeof(sa1.spii), icookie+2)!=8)
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return;
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if(espprint_decode_hex(ndo, sa1.spir, sizeof(sa1.spir), rcookie+2)!=8)
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return;
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if(!espprint_decode_encalgo(ndo, enckey, &sa1)) return;
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if(!espprint_decode_authalgo(ndo, authkey, &sa1)) return;
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esp_print_addsa(ndo, &sa1, FALSE);
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}
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/*
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*
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* special form: file /name
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* causes us to go read from this file instead.
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*
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*/
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static void esp_print_decode_onesecret(netdissect_options *ndo, char *line,
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const char *file, int lineno)
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{
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struct sa_list sa1;
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int sa_def;
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char *spikey;
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char *decode;
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spikey = strsep(&line, " \t");
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sa_def = 0;
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memset(&sa1, 0, sizeof(struct sa_list));
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/* if there is only one token, then it is an algo:key token */
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if (line == NULL) {
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decode = spikey;
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spikey = NULL;
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/* memset(&sa1.daddr, 0, sizeof(sa1.daddr)); */
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/* sa1.spi = 0; */
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sa_def = 1;
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} else
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decode = line;
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if (spikey && strcasecmp(spikey, "file") == 0) {
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/* open file and read it */
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FILE *secretfile;
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char fileline[1024];
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int lineno=0;
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char *nl;
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char *filename = line;
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secretfile = fopen(filename, FOPEN_READ_TXT);
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if (secretfile == NULL) {
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perror(filename);
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exit(3);
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}
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while (fgets(fileline, sizeof(fileline)-1, secretfile) != NULL) {
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lineno++;
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/* remove newline from the line */
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nl = strchr(fileline, '\n');
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if (nl)
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*nl = '\0';
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if (fileline[0] == '#') continue;
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if (fileline[0] == '\0') continue;
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esp_print_decode_onesecret(ndo, fileline, filename, lineno);
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}
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fclose(secretfile);
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return;
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}
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if (spikey && strcasecmp(spikey, "ikev2") == 0) {
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esp_print_decode_ikeline(ndo, line, file, lineno);
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return;
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}
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if (spikey) {
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char *spistr, *foo;
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u_int32_t spino;
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struct sockaddr_in *sin;
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#ifdef INET6
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struct sockaddr_in6 *sin6;
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#endif
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spistr = strsep(&spikey, "@");
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spino = strtoul(spistr, &foo, 0);
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if (spistr == foo || !spikey) {
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(*ndo->ndo_warning)(ndo, "print_esp: failed to decode spi# %s\n", foo);
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return;
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}
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sa1.spi = spino;
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sin = (struct sockaddr_in *)&sa1.daddr;
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#ifdef INET6
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sin6 = (struct sockaddr_in6 *)&sa1.daddr;
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if (inet_pton(AF_INET6, spikey, &sin6->sin6_addr) == 1) {
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#ifdef HAVE_SOCKADDR_SA_LEN
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sin6->sin6_len = sizeof(struct sockaddr_in6);
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#endif
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sin6->sin6_family = AF_INET6;
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} else
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#endif
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if (inet_pton(AF_INET, spikey, &sin->sin_addr) == 1) {
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#ifdef HAVE_SOCKADDR_SA_LEN
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sin->sin_len = sizeof(struct sockaddr_in);
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#endif
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sin->sin_family = AF_INET;
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} else {
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(*ndo->ndo_warning)(ndo, "print_esp: can not decode IP# %s\n", spikey);
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return;
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}
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}
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if (decode) {
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/* skip any blank spaces */
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while (isspace((unsigned char)*decode))
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decode++;
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if(!espprint_decode_encalgo(ndo, decode, &sa1)) {
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return;
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}
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}
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esp_print_addsa(ndo, &sa1, sa_def);
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}
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static void esp_init(netdissect_options *ndo _U_)
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{
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OpenSSL_add_all_algorithms();
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EVP_add_cipher_alias(SN_des_ede3_cbc, "3des");
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}
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void esp_print_decodesecret(netdissect_options *ndo)
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{
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char *line;
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char *p;
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static int initialized = 0;
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if (!initialized) {
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esp_init(ndo);
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initialized = 1;
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}
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p = ndo->ndo_espsecret;
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while (p && p[0] != '\0') {
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/* pick out the first line or first thing until a comma */
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if ((line = strsep(&p, "\n,")) == NULL) {
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line = p;
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p = NULL;
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}
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esp_print_decode_onesecret(ndo, line, "cmdline", 0);
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}
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ndo->ndo_espsecret = NULL;
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}
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#endif
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int
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esp_print(netdissect_options *ndo,
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const u_char *bp, const int length, const u_char *bp2
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#ifndef HAVE_LIBCRYPTO
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_U_
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#endif
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,
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int *nhdr
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#ifndef HAVE_LIBCRYPTO
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_U_
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#endif
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,
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int *padlen
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#ifndef HAVE_LIBCRYPTO
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_U_
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#endif
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)
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{
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register const struct newesp *esp;
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register const u_char *ep;
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#ifdef HAVE_LIBCRYPTO
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struct ip *ip;
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struct sa_list *sa = NULL;
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int espsecret_keylen;
|
|
#ifdef INET6
|
|
struct ip6_hdr *ip6 = NULL;
|
|
#endif
|
|
int advance;
|
|
int len;
|
|
u_char *secret;
|
|
int ivlen = 0;
|
|
u_char *ivoff;
|
|
u_char *p;
|
|
EVP_CIPHER_CTX ctx;
|
|
int blocksz;
|
|
#endif
|
|
|
|
esp = (struct newesp *)bp;
|
|
|
|
#ifdef HAVE_LIBCRYPTO
|
|
secret = NULL;
|
|
advance = 0;
|
|
#endif
|
|
|
|
#if 0
|
|
/* keep secret out of a register */
|
|
p = (u_char *)&secret;
|
|
#endif
|
|
|
|
/* 'ep' points to the end of available data. */
|
|
ep = ndo->ndo_snapend;
|
|
|
|
if ((u_char *)(esp + 1) >= ep) {
|
|
fputs("[|ESP]", stdout);
|
|
goto fail;
|
|
}
|
|
(*ndo->ndo_printf)(ndo, "ESP(spi=0x%08x", EXTRACT_32BITS(&esp->esp_spi));
|
|
(*ndo->ndo_printf)(ndo, ",seq=0x%x)", EXTRACT_32BITS(&esp->esp_seq));
|
|
(*ndo->ndo_printf)(ndo, ", length %u", length);
|
|
|
|
#ifndef HAVE_LIBCRYPTO
|
|
goto fail;
|
|
#else
|
|
/* initiailize SAs */
|
|
if (ndo->ndo_sa_list_head == NULL) {
|
|
if (!ndo->ndo_espsecret)
|
|
goto fail;
|
|
|
|
esp_print_decodesecret(ndo);
|
|
}
|
|
|
|
if (ndo->ndo_sa_list_head == NULL)
|
|
goto fail;
|
|
|
|
ip = (struct ip *)bp2;
|
|
switch (IP_V(ip)) {
|
|
#ifdef INET6
|
|
case 6:
|
|
ip6 = (struct ip6_hdr *)bp2;
|
|
/* we do not attempt to decrypt jumbograms */
|
|
if (!EXTRACT_16BITS(&ip6->ip6_plen))
|
|
goto fail;
|
|
/* if we can't get nexthdr, we do not need to decrypt it */
|
|
len = sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen);
|
|
|
|
/* see if we can find the SA, and if so, decode it */
|
|
for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) {
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&sa->daddr;
|
|
if (sa->spi == EXTRACT_32BITS(&esp->esp_spi) &&
|
|
sin6->sin6_family == AF_INET6 &&
|
|
memcmp(&sin6->sin6_addr, &ip6->ip6_dst,
|
|
sizeof(struct in6_addr)) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
#endif /*INET6*/
|
|
case 4:
|
|
/* nexthdr & padding are in the last fragment */
|
|
if (EXTRACT_16BITS(&ip->ip_off) & IP_MF)
|
|
goto fail;
|
|
len = EXTRACT_16BITS(&ip->ip_len);
|
|
|
|
/* see if we can find the SA, and if so, decode it */
|
|
for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) {
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)&sa->daddr;
|
|
if (sa->spi == EXTRACT_32BITS(&esp->esp_spi) &&
|
|
sin->sin_family == AF_INET &&
|
|
sin->sin_addr.s_addr == ip->ip_dst.s_addr) {
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
|
|
/* if we didn't find the specific one, then look for
|
|
* an unspecified one.
|
|
*/
|
|
if (sa == NULL)
|
|
sa = ndo->ndo_sa_default;
|
|
|
|
/* if not found fail */
|
|
if (sa == NULL)
|
|
goto fail;
|
|
|
|
/* if we can't get nexthdr, we do not need to decrypt it */
|
|
if (ep - bp2 < len)
|
|
goto fail;
|
|
if (ep - bp2 > len) {
|
|
/* FCS included at end of frame (NetBSD 1.6 or later) */
|
|
ep = bp2 + len;
|
|
}
|
|
|
|
ivoff = (u_char *)(esp + 1) + 0;
|
|
ivlen = sa->ivlen;
|
|
secret = sa->secret;
|
|
espsecret_keylen = sa->secretlen;
|
|
ep = ep - sa->authlen;
|
|
|
|
if (sa->evp) {
|
|
memset(&ctx, 0, sizeof(ctx));
|
|
if (EVP_CipherInit(&ctx, sa->evp, secret, NULL, 0) < 0)
|
|
(*ndo->ndo_warning)(ndo, "espkey init failed");
|
|
|
|
blocksz = EVP_CIPHER_CTX_block_size(&ctx);
|
|
|
|
p = ivoff;
|
|
EVP_CipherInit(&ctx, NULL, NULL, p, 0);
|
|
EVP_Cipher(&ctx, p + ivlen, p + ivlen, ep - (p + ivlen));
|
|
EVP_CIPHER_CTX_cleanup(&ctx);
|
|
advance = ivoff - (u_char *)esp + ivlen;
|
|
} else
|
|
advance = sizeof(struct newesp);
|
|
|
|
/* sanity check for pad length */
|
|
if (ep - bp < *(ep - 2))
|
|
goto fail;
|
|
|
|
if (padlen)
|
|
*padlen = *(ep - 2) + 2;
|
|
|
|
if (nhdr)
|
|
*nhdr = *(ep - 1);
|
|
|
|
(ndo->ndo_printf)(ndo, ": ");
|
|
return advance;
|
|
#endif
|
|
|
|
fail:
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-style: whitesmith
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|