* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.56 2005-04-21 06:44:40 guy Exp $ (LBL)";
-#endif
-
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
+/* Any code in this file that depends on HAVE_LIBCRYPTO depends on
+ * HAVE_OPENSSL_EVP_H too. Undefining the former when the latter isn't defined
+ * is the simplest way of handling the dependency.
+ */
#ifdef HAVE_LIBCRYPTO
#ifdef HAVE_OPENSSL_EVP_H
#include <openssl/evp.h>
+#else
+#undef HAVE_LIBCRYPTO
#endif
#endif
#include <stdio.h>
#include "ip.h"
-#include "esp.h"
#ifdef INET6
#include "ip6.h"
#endif
#include "addrtoname.h"
#include "extract.h"
-#ifndef HAVE_SOCKADDR_STORAGE
-#ifdef INET6
-struct sockaddr_storage {
- union {
- struct sockaddr_in sin;
- struct sockaddr_in6 sin6;
- } un;
+/*
+ * 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.
+ */
+
+/*
+ * RFC1827/2406 Encapsulated Security Payload.
+ */
+
+struct newesp {
+ u_int32_t esp_spi; /* ESP */
+ u_int32_t esp_seq; /* Sequence number */
+ /*variable size*/ /* (IV and) Payload data */
+ /*variable size*/ /* padding */
+ /*8bit*/ /* pad size */
+ /*8bit*/ /* next header */
+ /*8bit*/ /* next header */
+ /*variable size, 32bit bound*/ /* Authentication data */
};
-#else
-#define sockaddr_storage sockaddr
-#endif
-#endif /* HAVE_SOCKADDR_STORAGE */
#ifdef HAVE_LIBCRYPTO
+union inaddr_u {
+ struct in_addr in4;
+#ifdef INET6
+ struct in6_addr in6;
+#endif
+};
struct sa_list {
struct sa_list *next;
- struct sockaddr_storage daddr;
- u_int32_t spi;
+ u_int daddr_version;
+ union inaddr_u daddr;
+ u_int32_t spi; /* if == 0, then IKEv2 */
+ int initiator;
+ u_char spii[8]; /* for IKEv2 */
+ u_char spir[8];
const EVP_CIPHER *evp;
int ivlen;
int authlen;
+ u_char authsecret[256];
+ int authsecret_len;
u_char secret[256]; /* is that big enough for all secrets? */
int secretlen;
};
+/*
+ * this will adjust ndo_packetp and ndo_snapend to new buffer!
+ */
+USES_APPLE_DEPRECATED_API
+int esp_print_decrypt_buffer_by_ikev2(netdissect_options *ndo,
+ int initiator,
+ u_char spii[8], u_char spir[8],
+ u_char *buf, u_char *end)
+{
+ struct sa_list *sa;
+ u_char *iv;
+ int len;
+ EVP_CIPHER_CTX ctx;
+
+ /* initiator arg is any non-zero value */
+ if(initiator) initiator=1;
+
+ /* see if we can find the SA, and if so, decode it */
+ for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) {
+ if (sa->spi == 0
+ && initiator == sa->initiator
+ && memcmp(spii, sa->spii, 8) == 0
+ && memcmp(spir, sa->spir, 8) == 0)
+ break;
+ }
+
+ if(sa == NULL) return 0;
+ if(sa->evp == NULL) return 0;
+
+ /*
+ * remove authenticator, and see if we still have something to
+ * work with
+ */
+ end = end - sa->authlen;
+ iv = buf;
+ buf = buf + sa->ivlen;
+ len = end-buf;
+
+ if(end <= buf) return 0;
+
+ memset(&ctx, 0, sizeof(ctx));
+ if (EVP_CipherInit(&ctx, sa->evp, sa->secret, NULL, 0) < 0)
+ (*ndo->ndo_warning)(ndo, "espkey init failed");
+ EVP_CipherInit(&ctx, NULL, NULL, iv, 0);
+ EVP_Cipher(&ctx, buf, buf, len);
+ EVP_CIPHER_CTX_cleanup(&ctx);
+
+ ndo->ndo_packetp = buf;
+ ndo->ndo_snapend = end;
+
+ return 1;
+
+}
+USES_APPLE_RST
+
static void esp_print_addsa(netdissect_options *ndo,
struct sa_list *sa, int sa_def)
{
return byte;
}
+/*
+ * returns size of binary, 0 on failure.
+ */
+static
+int espprint_decode_hex(netdissect_options *ndo,
+ u_char *binbuf, unsigned int binbuf_len,
+ char *hex)
+{
+ unsigned int len;
+ int i;
+
+ len = strlen(hex) / 2;
+
+ if (len > binbuf_len) {
+ (*ndo->ndo_warning)(ndo, "secret is too big: %d\n", len);
+ return 0;
+ }
+
+ i = 0;
+ while (hex[0] != '\0' && hex[1]!='\0') {
+ binbuf[i] = hex2byte(ndo, hex);
+ hex += 2;
+ i++;
+ }
+
+ return i;
+}
+
/*
* decode the form: SPINUM@IP <tab> ALGONAME:0xsecret
+ */
+
+USES_APPLE_DEPRECATED_API
+static int
+espprint_decode_encalgo(netdissect_options *ndo,
+ char *decode, struct sa_list *sa)
+{
+ size_t i;
+ const EVP_CIPHER *evp;
+ int authlen = 0;
+ char *colon, *p;
+
+ colon = strchr(decode, ':');
+ if (colon == NULL) {
+ (*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode);
+ return 0;
+ }
+ *colon = '\0';
+
+ if (strlen(decode) > strlen("-hmac96") &&
+ !strcmp(decode + strlen(decode) - strlen("-hmac96"),
+ "-hmac96")) {
+ p = strstr(decode, "-hmac96");
+ *p = '\0';
+ authlen = 12;
+ }
+ if (strlen(decode) > strlen("-cbc") &&
+ !strcmp(decode + strlen(decode) - strlen("-cbc"), "-cbc")) {
+ p = strstr(decode, "-cbc");
+ *p = '\0';
+ }
+ evp = EVP_get_cipherbyname(decode);
+
+ if (!evp) {
+ (*ndo->ndo_warning)(ndo, "failed to find cipher algo %s\n", decode);
+ sa->evp = NULL;
+ sa->authlen = 0;
+ sa->ivlen = 0;
+ return 0;
+ }
+
+ sa->evp = evp;
+ sa->authlen = authlen;
+ sa->ivlen = EVP_CIPHER_iv_length(evp);
+
+ colon++;
+ if (colon[0] == '0' && colon[1] == 'x') {
+ /* decode some hex! */
+
+ colon += 2;
+ sa->secretlen = espprint_decode_hex(ndo, sa->secret, sizeof(sa->secret), colon);
+ if(sa->secretlen == 0) return 0;
+ } else {
+ i = strlen(colon);
+
+ if (i < sizeof(sa->secret)) {
+ memcpy(sa->secret, colon, i);
+ sa->secretlen = i;
+ } else {
+ memcpy(sa->secret, colon, sizeof(sa->secret));
+ sa->secretlen = sizeof(sa->secret);
+ }
+ }
+
+ return 1;
+}
+USES_APPLE_RST
+
+/*
+ * for the moment, ignore the auth algorith, just hard code the authenticator
+ * length. Need to research how openssl looks up HMAC stuff.
+ */
+static int
+espprint_decode_authalgo(netdissect_options *ndo,
+ char *decode, struct sa_list *sa)
+{
+ char *colon;
+
+ colon = strchr(decode, ':');
+ if (colon == NULL) {
+ (*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode);
+ return 0;
+ }
+ *colon = '\0';
+
+ if(strcasecmp(colon,"sha1") == 0 ||
+ strcasecmp(colon,"md5") == 0) {
+ sa->authlen = 12;
+ }
+ return 1;
+}
+
+static void esp_print_decode_ikeline(netdissect_options *ndo, char *line,
+ const char *file, int lineno)
+{
+ /* it's an IKEv2 secret, store it instead */
+ struct sa_list sa1;
+
+ char *init;
+ char *icookie, *rcookie;
+ int ilen, rlen;
+ char *authkey;
+ char *enckey;
+
+ init = strsep(&line, " \t");
+ icookie = strsep(&line, " \t");
+ rcookie = strsep(&line, " \t");
+ authkey = strsep(&line, " \t");
+ enckey = strsep(&line, " \t");
+
+ /* if any fields are missing */
+ if(!init || !icookie || !rcookie || !authkey || !enckey) {
+ (*ndo->ndo_warning)(ndo, "print_esp: failed to find all fields for ikev2 at %s:%u",
+ file, lineno);
+
+ return;
+ }
+
+ ilen = strlen(icookie);
+ rlen = strlen(rcookie);
+
+ if((init[0]!='I' && init[0]!='R')
+ || icookie[0]!='0' || icookie[1]!='x'
+ || rcookie[0]!='0' || rcookie[1]!='x'
+ || ilen!=18
+ || rlen!=18) {
+ (*ndo->ndo_warning)(ndo, "print_esp: line %s:%u improperly formatted.",
+ file, lineno);
+
+ (*ndo->ndo_warning)(ndo, "init=%s icookie=%s(%u) rcookie=%s(%u)",
+ init, icookie, ilen, rcookie, rlen);
+
+ return;
+ }
+
+ sa1.spi = 0;
+ sa1.initiator = (init[0] == 'I');
+ if(espprint_decode_hex(ndo, sa1.spii, sizeof(sa1.spii), icookie+2)!=8)
+ return;
+
+ if(espprint_decode_hex(ndo, sa1.spir, sizeof(sa1.spir), rcookie+2)!=8)
+ return;
+
+ if(!espprint_decode_encalgo(ndo, enckey, &sa1)) return;
+
+ if(!espprint_decode_authalgo(ndo, authkey, &sa1)) return;
+
+ esp_print_addsa(ndo, &sa1, FALSE);
+}
+
+/*
*
* special form: file /name
* causes us to go read from this file instead.
*
*/
-static void esp_print_decode_onesecret(netdissect_options *ndo, char *line)
+static void esp_print_decode_onesecret(netdissect_options *ndo, char *line,
+ const char *file, int lineno)
{
struct sa_list sa1;
int sa_def;
if (line == NULL) {
decode = spikey;
spikey = NULL;
+ /* sa1.daddr.version = 0; */
/* memset(&sa1.daddr, 0, sizeof(sa1.daddr)); */
/* sa1.spi = 0; */
sa_def = 1;
/* open file and read it */
FILE *secretfile;
char fileline[1024];
+ int lineno=0;
char *nl;
+ char *filename = line;
- secretfile = fopen(line, FOPEN_READ_TXT);
+ secretfile = fopen(filename, FOPEN_READ_TXT);
if (secretfile == NULL) {
- perror(line);
+ perror(filename);
exit(3);
}
while (fgets(fileline, sizeof(fileline)-1, secretfile) != NULL) {
+ lineno++;
/* remove newline from the line */
nl = strchr(fileline, '\n');
if (nl)
if (fileline[0] == '#') continue;
if (fileline[0] == '\0') continue;
- esp_print_decode_onesecret(ndo, fileline);
+ esp_print_decode_onesecret(ndo, fileline, filename, lineno);
}
fclose(secretfile);
return;
}
+ if (spikey && strcasecmp(spikey, "ikev2") == 0) {
+ esp_print_decode_ikeline(ndo, line, file, lineno);
+ return;
+ }
+
if (spikey) {
+
char *spistr, *foo;
u_int32_t spino;
- struct sockaddr_in *sin;
-#ifdef INET6
- struct sockaddr_in6 *sin6;
-#endif
spistr = strsep(&spikey, "@");
sa1.spi = spino;
- sin = (struct sockaddr_in *)&sa1.daddr;
#ifdef INET6
- sin6 = (struct sockaddr_in6 *)&sa1.daddr;
- if (inet_pton(AF_INET6, spikey, &sin6->sin6_addr) == 1) {
-#ifdef HAVE_SOCKADDR_SA_LEN
- sin6->sin6_len = sizeof(struct sockaddr_in6);
-#endif
- sin6->sin6_family = AF_INET6;
+ if (inet_pton(AF_INET6, spikey, &sa1.daddr.in6) == 1) {
+ sa1.daddr_version = 6;
} else
#endif
- if (inet_pton(AF_INET, spikey, &sin->sin_addr) == 1) {
-#ifdef HAVE_SOCKADDR_SA_LEN
- sin->sin_len = sizeof(struct sockaddr_in);
-#endif
- sin->sin_family = AF_INET;
- } else {
- (*ndo->ndo_warning)(ndo, "print_esp: can not decode IP# %s\n", spikey);
- return;
- }
+ if (inet_pton(AF_INET, spikey, &sa1.daddr.in4) == 1) {
+ sa1.daddr_version = 4;
+ } else {
+ (*ndo->ndo_warning)(ndo, "print_esp: can not decode IP# %s\n", spikey);
+ return;
+ }
}
if (decode) {
- char *colon, *p;
- u_char espsecret_key[256];
- int len;
- size_t i;
- const EVP_CIPHER *evp;
- int authlen = 0;
-
/* skip any blank spaces */
while (isspace((unsigned char)*decode))
decode++;
- colon = strchr(decode, ':');
- if (colon == NULL) {
- (*ndo->ndo_warning)(ndo, "failed to decode espsecret: %s\n", decode);
- return;
- }
- *colon = '\0';
-
- len = colon - decode;
- if (strlen(decode) > strlen("-hmac96") &&
- !strcmp(decode + strlen(decode) - strlen("-hmac96"),
- "-hmac96")) {
- p = strstr(decode, "-hmac96");
- *p = '\0';
- authlen = 12;
- }
- if (strlen(decode) > strlen("-cbc") &&
- !strcmp(decode + strlen(decode) - strlen("-cbc"), "-cbc")) {
- p = strstr(decode, "-cbc");
- *p = '\0';
- }
- evp = EVP_get_cipherbyname(decode);
- if (!evp) {
- (*ndo->ndo_warning)(ndo, "failed to find cipher algo %s\n", decode);
- sa1.evp = NULL;
- sa1.authlen = 0;
- sa1.ivlen = 0;
+ if(!espprint_decode_encalgo(ndo, decode, &sa1)) {
return;
}
-
- sa1.evp = evp;
- sa1.authlen = authlen;
- sa1.ivlen = EVP_CIPHER_iv_length(evp);
-
- colon++;
- if (colon[0] == '0' && colon[1] == 'x') {
- /* decode some hex! */
- colon += 2;
- len = strlen(colon) / 2;
-
- if (len > 256) {
- (*ndo->ndo_warning)(ndo, "secret is too big: %d\n", len);
- return;
- }
-
- i = 0;
- while (colon[0] != '\0' && colon[1]!='\0') {
- espsecret_key[i] = hex2byte(ndo, colon);
- colon += 2;
- i++;
- }
-
- memcpy(sa1.secret, espsecret_key, i);
- sa1.secretlen = i;
- } else {
- i = strlen(colon);
-
- if (i < sizeof(sa1.secret)) {
- memcpy(sa1.secret, colon, i);
- sa1.secretlen = i;
- } else {
- memcpy(sa1.secret, colon, sizeof(sa1.secret));
- sa1.secretlen = sizeof(sa1.secret);
- }
- }
}
esp_print_addsa(ndo, &sa1, sa_def);
}
-static void esp_print_decodesecret(netdissect_options *ndo)
+USES_APPLE_DEPRECATED_API
+static void esp_init(netdissect_options *ndo _U_)
+{
+
+ OpenSSL_add_all_algorithms();
+ EVP_add_cipher_alias(SN_des_ede3_cbc, "3des");
+}
+USES_APPLE_RST
+
+void esp_print_decodesecret(netdissect_options *ndo)
{
char *line;
char *p;
+ static int initialized = 0;
+
+ if (!initialized) {
+ esp_init(ndo);
+ initialized = 1;
+ }
p = ndo->ndo_espsecret;
- while (ndo->ndo_espsecret && ndo->ndo_espsecret[0] != '\0') {
+ while (p && p[0] != '\0') {
/* pick out the first line or first thing until a comma */
- if ((line = strsep(&ndo->ndo_espsecret, "\n,")) == NULL) {
- line = ndo->ndo_espsecret;
- ndo->ndo_espsecret = NULL;
+ if ((line = strsep(&p, "\n,")) == NULL) {
+ line = p;
+ p = NULL;
}
- esp_print_decode_onesecret(ndo, line);
+ esp_print_decode_onesecret(ndo, line, "cmdline", 0);
}
-}
-
-static void esp_init(netdissect_options *ndo _U_)
-{
- OpenSSL_add_all_algorithms();
- EVP_add_cipher_alias(SN_des_ede3_cbc, "3des");
+ ndo->ndo_espsecret = NULL;
}
+
#endif
+#ifdef HAVE_LIBCRYPTO
+USES_APPLE_DEPRECATED_API
+#endif
int
esp_print(netdissect_options *ndo,
const u_char *bp, const int length, const u_char *bp2
#ifdef HAVE_LIBCRYPTO
struct ip *ip;
struct sa_list *sa = NULL;
- int espsecret_keylen;
#ifdef INET6
struct ip6_hdr *ip6 = NULL;
#endif
u_char *ivoff;
u_char *p;
EVP_CIPHER_CTX ctx;
- int blocksz;
- static int initialized = 0;
#endif
esp = (struct newesp *)bp;
#ifdef HAVE_LIBCRYPTO
secret = NULL;
advance = 0;
-
- if (!initialized) {
- esp_init(ndo);
- initialized = 1;
- }
#endif
#if 0
/* 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 == ntohl(esp->esp_spi) &&
- sin6->sin6_family == AF_INET6 &&
- memcmp(&sin6->sin6_addr, &ip6->ip6_dst,
+ if (sa->spi == EXTRACT_32BITS(&esp->esp_spi) &&
+ sa->daddr_version == 6 &&
+ UNALIGNED_MEMCMP(&sa->daddr.in6, &ip6->ip6_dst,
sizeof(struct in6_addr)) == 0) {
break;
}
/* 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 == ntohl(esp->esp_spi) &&
- sin->sin_family == AF_INET &&
- sin->sin_addr.s_addr == ip->ip_dst.s_addr) {
+ if (sa->spi == EXTRACT_32BITS(&esp->esp_spi) &&
+ sa->daddr_version == 4 &&
+ UNALIGNED_MEMCMP(&sa->daddr.in4, &ip->ip_dst,
+ sizeof(struct in_addr)) == 0) {
break;
}
}
*/
if (sa == NULL)
sa = ndo->ndo_sa_default;
-
+
/* if not found fail */
if (sa == NULL)
goto fail;
ivoff = (u_char *)(esp + 1) + 0;
ivlen = sa->ivlen;
secret = sa->secret;
- espsecret_keylen = sa->secretlen;
ep = ep - sa->authlen;
if (sa->evp) {
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);
fail:
return -1;
}
+#ifdef HAVE_LIBCRYPTO
+USES_APPLE_RST
+#endif
/*
* Local Variables:
projects / tcpdump / blobdiff