* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.47 2003-11-19 00:36:07 guy Exp $ (LBL)";
-#endif
+/* \summary: IPSEC Encapsulating Security Payload (ESP) printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <string.h>
-
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
+#include <string.h>
#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 "netdissect.h"
+#include "strtoaddr.h"
+#include "extract.h"
+
+#include "ascii_strcasecmp.h"
#include "ip.h"
-#include "esp.h"
-#ifdef INET6
#include "ip6.h"
-#endif
-#if defined(__MINGW32__) || defined(__WATCOMC__)
-extern char *strsep(char **stringp, const char *delim); /* Missing/strsep.c */
-#endif
+/*
+ * 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.
+ */
-#include "interface.h"
-#include "addrtoname.h"
-#include "extract.h"
+/*
+ * RFC1827/2406 Encapsulated Security Payload.
+ */
-#ifndef HAVE_SOCKADDR_STORAGE
-#ifdef INET6
-struct sockaddr_storage {
- union {
- struct sockaddr_in sin;
- struct sockaddr_in6 sin6;
- } un;
+struct newesp {
+ uint32_t esp_spi; /* ESP */
+ uint32_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;
+ struct in6_addr in6;
+};
struct sa_list {
struct sa_list *next;
- struct sockaddr_storage daddr;
- u_int32_t spi;
+ u_int daddr_version;
+ union inaddr_u daddr;
+ uint32_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;
- char secret[256]; /* is that big enough for all secrets? */
+ u_char authsecret[256];
+ int authsecret_len;
+ u_char secret[256]; /* is that big enough for all secrets? */
int secretlen;
};
-static struct sa_list *sa_list_head = NULL;
-static struct sa_list *sa_default = NULL;
+#ifndef HAVE_EVP_CIPHER_CTX_NEW
+/*
+ * Allocate an EVP_CIPHER_CTX.
+ * Used if we have an older version of OpenSSL that doesn't provide
+ * routines to allocate and free them.
+ */
+static EVP_CIPHER_CTX *
+EVP_CIPHER_CTX_new(void)
+{
+ EVP_CIPHER_CTX *ctx;
+
+ ctx = malloc(sizeof(*ctx));
+ if (ctx == NULL)
+ return (NULL);
+ memset(ctx, 0, sizeof(*ctx));
+ return (ctx);
+}
+
+static void
+EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
+{
+ EVP_CIPHER_CTX_cleanup(ctx);
+ free(ctx);
+}
+#endif
+
+#ifdef HAVE_EVP_CIPHERINIT_EX
+/*
+ * Initialize the cipher by calling EVP_CipherInit_ex(), because
+ * calling EVP_CipherInit() will reset the cipher context, clearing
+ * the cipher, so calling it twice, with the second call having a
+ * null cipher, will clear the already-set cipher. EVP_CipherInit_ex(),
+ * however, won't reset the cipher context, so you can use it to specify
+ * the IV oin a second call after a first call to EVP_CipherInit_ex()
+ * to set the cipher and the key.
+ *
+ * XXX - is there some reason why we need to make two calls?
+ */
+static int
+set_cipher_parameters(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ const unsigned char *key,
+ const unsigned char *iv, int enc)
+{
+ return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
+}
+#else
+/*
+ * Initialize the cipher by calling EVP_CipherInit(), because we don't
+ * have EVP_CipherInit_ex(); we rely on it not trashing the context.
+ */
+static int
+set_cipher_parameters(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ const unsigned char *key,
+ const unsigned char *iv, int enc)
+{
+ return EVP_CipherInit(ctx, cipher, key, iv, enc);
+}
+#endif
+
+/*
+ * 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],
+ const u_char *buf, const u_char *end)
+{
+ struct sa_list *sa;
+ const u_char *iv;
+ unsigned int len;
+ EVP_CIPHER_CTX *ctx;
+ unsigned int block_size, buffer_size;
+ u_char *input_buffer, *output_buffer;
+
+ /* 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;
-static void esp_print_addsa(struct sa_list *sa, int sa_def)
+ ctx = EVP_CIPHER_CTX_new();
+ if (ctx == NULL)
+ return 0;
+ if (set_cipher_parameters(ctx, sa->evp, sa->secret, NULL, 0) < 0)
+ (*ndo->ndo_warning)(ndo, "espkey init failed");
+ set_cipher_parameters(ctx, NULL, NULL, iv, 0);
+ /*
+ * Allocate buffers for the encrypted and decrypted data.
+ * Both buffers' sizes must be a multiple of the cipher block
+ * size, and the output buffer must be separate from the input
+ * buffer.
+ */
+ block_size = (unsigned int)EVP_CIPHER_CTX_block_size(ctx);
+ buffer_size = len + (block_size - len % block_size);
+
+ /*
+ * Attempt to allocate the input buffer.
+ */
+ input_buffer = (u_char *)malloc(buffer_size);
+ if (input_buffer == NULL) {
+ EVP_CIPHER_CTX_free(ctx);
+ (*ndo->ndo_error)(ndo, "can't allocate memory for encrypted data buffer");
+ }
+ /*
+ * Copy the input data to the encrypted data buffer, and pad it
+ * with zeroes.
+ */
+ memcpy(input_buffer, buf, len);
+ memset(input_buffer + len, 0, buffer_size - len);
+
+ /*
+ * Attempt to allocate the output buffer.
+ */
+ output_buffer = (u_char *)malloc(buffer_size);
+ if (output_buffer == NULL) {
+ free(input_buffer);
+ EVP_CIPHER_CTX_free(ctx);
+ (*ndo->ndo_error)(ndo, "can't allocate memory for decryption buffer");
+ }
+ EVP_Cipher(ctx, output_buffer, input_buffer, len);
+ EVP_CIPHER_CTX_free(ctx);
+
+ /*
+ * XXX - of course this is wrong, because buf is a const buffer,
+ * but changing this would require a more complicated fix.
+ */
+ memcpy(buf, output_buffer, len);
+ free(input_buffer);
+ free(output_buffer);
+
+ 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)
{
/* copy the "sa" */
nsa = (struct sa_list *)malloc(sizeof(struct sa_list));
if (nsa == NULL)
- error("ran out of memory to allocate sa structure");
+ (*ndo->ndo_error)(ndo, "ran out of memory to allocate sa structure");
*nsa = *sa;
if (sa_def)
- sa_default = nsa;
+ ndo->ndo_sa_default = nsa;
- nsa->next = sa_list_head;
- sa_list_head = nsa;
+ nsa->next = ndo->ndo_sa_list_head;
+ ndo->ndo_sa_list_head = nsa;
}
-static int hexdigit(char hex)
+static u_int hexdigit(netdissect_options *ndo, char hex)
{
if (hex >= '0' && hex <= '9')
return (hex - '0');
else if (hex >= 'a' && hex <= 'f')
return (hex - 'a' + 10);
else {
- printf("invalid hex digit %c in espsecret\n", hex);
- return 0;
+ (*ndo->ndo_error)(ndo, "invalid hex digit %c in espsecret\n", hex);
}
}
-static int hex2byte(char *hexstring)
+static u_int hex2byte(netdissect_options *ndo, char *hexstring)
{
- int byte;
+ u_int byte;
- byte = (hexdigit(hexstring[0]) << 4) + hexdigit(hexstring[1]);
+ byte = (hexdigit(ndo, hexstring[0]) << 4) + hexdigit(ndo, hexstring[1]);
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 algorithm, 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(ascii_strcasecmp(colon,"sha1") == 0 ||
+ ascii_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(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;
} else
decode = line;
- if (spikey && strcasecmp(spikey, "file") == 0) {
+ if (spikey && ascii_strcasecmp(spikey, "file") == 0) {
/* open file and read it */
FILE *secretfile;
char fileline[1024];
+ int subfile_lineno=0;
char *nl;
+ char *filename = line;
- secretfile = fopen(line, FOPEN_READ_TXT);
+ secretfile = fopen(filename, FOPEN_READ_TXT);
if (secretfile == NULL) {
- perror(line);
- exit(3);
+ (*ndo->ndo_error)(ndo, "print_esp: can't open %s: %s\n",
+ filename, strerror(errno));
}
while (fgets(fileline, sizeof(fileline)-1, secretfile) != NULL) {
+ subfile_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(fileline);
+ esp_print_decode_onesecret(ndo, fileline, filename, subfile_lineno);
}
fclose(secretfile);
return;
}
+ if (spikey && ascii_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
+ uint32_t spino;
spistr = strsep(&spikey, "@");
+ if (spistr == NULL) {
+ (*ndo->ndo_warning)(ndo, "print_esp: failed to find the @ token");
+ return;
+ }
spino = strtoul(spistr, &foo, 0);
if (spistr == foo || !spikey) {
- printf("print_esp: failed to decode spi# %s\n", foo);
+ (*ndo->ndo_warning)(ndo, "print_esp: failed to decode spi# %s\n", foo);
return;
}
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;
- } 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;
+ if (strtoaddr6(spikey, &sa1.daddr.in6) == 1) {
+ sa1.daddr_version = 6;
+ } else if (strtoaddr(spikey, &sa1.daddr.in4) == 1) {
+ sa1.daddr_version = 4;
} else {
- printf("print_esp: can not decode IP# %s\n", spikey);
+ (*ndo->ndo_warning)(ndo, "print_esp: can not decode IP# %s\n", spikey);
return;
}
}
if (decode) {
- char *colon, *p;
- char espsecret_key[256];
- int len;
- size_t i;
- const EVP_CIPHER *evp;
- int ivlen = 8;
- int authlen = 0;
-
/* skip any blank spaces */
while (isspace((unsigned char)*decode))
decode++;
- colon = strchr(decode, ':');
- if (colon == NULL) {
- printf("failed to decode espsecret: %s\n", decode);
+ if(!espprint_decode_encalgo(ndo, decode, &sa1)) {
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) {
- printf("failed to find cipher algo %s\n", decode);
- sa1.evp = NULL;
- sa1.authlen = 0;
- sa1.ivlen = 0;
- return;
- }
-
- sa1.evp = evp;
- sa1.authlen = authlen;
- sa1.ivlen = ivlen;
-
- colon++;
- if (colon[0] == '0' && colon[1] == 'x') {
- /* decode some hex! */
- colon += 2;
- len = strlen(colon) / 2;
-
- if (len > 256) {
- printf("secret is too big: %d\n", len);
- return;
- }
-
- i = 0;
- while (colon[0] != '\0' && colon[1]!='\0') {
- espsecret_key[i] = hex2byte(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(&sa1, sa_def);
+ esp_print_addsa(ndo, &sa1, sa_def);
}
-static void esp_print_decodesecret(void)
+USES_APPLE_DEPRECATED_API
+static void esp_init(netdissect_options *ndo _U_)
+{
+ /*
+ * 0.9.6 doesn't appear to define OPENSSL_API_COMPAT, so
+ * we check whether it's undefined or it's less than the
+ * value for 1.1.0.
+ */
+#if !defined(OPENSSL_API_COMPAT) || OPENSSL_API_COMPAT < 0x10100000L
+ OpenSSL_add_all_algorithms();
+#endif
+ 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 = espsecret;
+ p = ndo->ndo_espsecret;
- while (espsecret && espsecret[0] != '\0') {
+ while (p && p[0] != '\0') {
/* pick out the first line or first thing until a comma */
- if ((line = strsep(&espsecret, "\n,")) == NULL) {
- line = espsecret;
- espsecret = NULL;
+ if ((line = strsep(&p, "\n,")) == NULL) {
+ line = p;
+ p = NULL;
}
- esp_print_decode_onesecret(line);
+ esp_print_decode_onesecret(ndo, line, "cmdline", 0);
}
-}
-static void esp_init(void)
-{
-
- 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(const u_char *bp, const u_char *bp2
+esp_print(netdissect_options *ndo,
+ const u_char *bp, const int length, const u_char *bp2
#ifndef HAVE_LIBCRYPTO
_U_
#endif
register const struct newesp *esp;
register const u_char *ep;
#ifdef HAVE_LIBCRYPTO
- struct ip *ip;
+ const struct ip *ip;
struct sa_list *sa = NULL;
- int espsecret_keylen;
-#ifdef INET6
- struct ip6_hdr *ip6 = NULL;
-#endif
+ const struct ip6_hdr *ip6 = NULL;
int advance;
int len;
- char *secret;
+ u_char *secret;
int ivlen = 0;
- u_char *ivoff;
+ const u_char *ivoff;
const u_char *p;
- EVP_CIPHER_CTX ctx;
- int blocksz;
- static int initialized = 0;
+ EVP_CIPHER_CTX *ctx;
+ unsigned int block_size, buffer_size;
+ u_char *input_buffer, *output_buffer;
#endif
- esp = (struct newesp *)bp;
+ esp = (const struct newesp *)bp;
#ifdef HAVE_LIBCRYPTO
secret = NULL;
- padvance = 0;
-
- if (!initialized) {
- esp_init();
- initialized = 1;
- }
+ advance = 0;
#endif
#if 0
#endif
/* 'ep' points to the end of available data. */
- ep = snapend;
+ ep = ndo->ndo_snapend;
- if ((u_char *)(esp + 1) >= ep) {
- fputs("[|ESP]", stdout);
+ if ((const u_char *)(esp + 1) >= ep) {
+ ND_PRINT((ndo, "[|ESP]"));
goto fail;
}
- printf("ESP(spi=0x%08x", EXTRACT_32BITS(&esp->esp_spi));
- printf(",seq=0x%x", EXTRACT_32BITS(&esp->esp_seq));
- printf(")");
+ ND_PRINT((ndo, "ESP(spi=0x%08x", EXTRACT_32BITS(&esp->esp_spi)));
+ ND_PRINT((ndo, ",seq=0x%x)", EXTRACT_32BITS(&esp->esp_seq)));
+ ND_PRINT((ndo, ", length %u", length));
#ifndef HAVE_LIBCRYPTO
goto fail;
#else
/* initiailize SAs */
- if (sa_list_head == NULL) {
- if (!espsecret)
+ if (ndo->ndo_sa_list_head == NULL) {
+ if (!ndo->ndo_espsecret)
goto fail;
- esp_print_decodesecret();
+ esp_print_decodesecret(ndo);
}
- if (sa_list_head == NULL)
+ if (ndo->ndo_sa_list_head == NULL)
goto fail;
- ip = (struct ip *)bp2;
+ ip = (const struct ip *)bp2;
switch (IP_V(ip)) {
-#ifdef INET6
case 6:
- ip6 = (struct ip6_hdr *)bp2;
+ ip6 = (const struct ip6_hdr *)bp2;
/* we do not attempt to decrypt jumbograms */
if (!EXTRACT_16BITS(&ip6->ip6_plen))
goto fail;
len = sizeof(struct ip6_hdr) + EXTRACT_16BITS(&ip6->ip6_plen);
/* see if we can find the SA, and if so, decode it */
- for (sa = 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,
+ for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) {
+ 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;
}
}
break;
-#endif /*INET6*/
case 4:
/* nexthdr & padding are in the last fragment */
if (EXTRACT_16BITS(&ip->ip_off) & IP_MF)
len = EXTRACT_16BITS(&ip->ip_len);
/* see if we can find the SA, and if so, decode it */
- for (sa = 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) {
+ for (sa = ndo->ndo_sa_list_head; sa != NULL; sa = sa->next) {
+ 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;
}
}
* an unspecified one.
*/
if (sa == NULL)
- sa = sa_default;
-
+ sa = ndo->ndo_sa_default;
+
/* if not found fail */
if (sa == NULL)
goto fail;
ep = bp2 + len;
}
- ivoff = (u_char *)(esp + 1) + 0;
+ /* pointer to the IV, if there is one */
+ ivoff = (const u_char *)(esp + 1) + 0;
+ /* length of the IV, if there is one; 0, if there isn't */
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)
- printf("espkey init failed");
-
- blocksz = EVP_CIPHER_CTX_block_size(&ctx);
+ ctx = EVP_CIPHER_CTX_new();
+ if (ctx != NULL) {
+ if (set_cipher_parameters(ctx, sa->evp, secret, NULL, 0) < 0)
+ (*ndo->ndo_warning)(ndo, "espkey init failed");
+
+ p = ivoff;
+ set_cipher_parameters(ctx, NULL, NULL, p, 0);
+ len = ep - (p + ivlen);
+
+ /*
+ * Allocate buffers for the encrypted and decrypted
+ * data. Both buffers' sizes must be a multiple of
+ * the cipher block size, and the output buffer must
+ * be separate from the input buffer.
+ */
+ block_size = (unsigned int)EVP_CIPHER_CTX_block_size(ctx);
+ buffer_size = len + (block_size - len % block_size);
+
+ /*
+ * Attempt to allocate the input buffer.
+ */
+ input_buffer = (u_char *)malloc(buffer_size);
+ if (input_buffer == NULL) {
+ EVP_CIPHER_CTX_free(ctx);
+ (*ndo->ndo_error)(ndo, "can't allocate memory for encrypted data buffer");
+ }
+ /*
+ * Copy the input data to the encrypted data buffer,
+ * and pad it with zeroes.
+ */
+ memcpy(input_buffer, p + ivlen, len);
+ memset(input_buffer + len, 0, buffer_size - len);
+
+ /*
+ * Attempt to allocate the output buffer.
+ */
+ output_buffer = (u_char *)malloc(buffer_size);
+ if (output_buffer == NULL) {
+ free(input_buffer);
+ EVP_CIPHER_CTX_free(ctx);
+ (*ndo->ndo_error)(ndo, "can't allocate memory for decryption buffer");
+ }
- p = ivoff;
- EVP_CipherInit(&ctx, NULL, NULL, p, 0);
- EVP_Cipher(&ctx, p + ivlen, p + ivlen, ep - (p + ivlen));
- advance = ivoff - (u_char *)esp + ivlen;
+ EVP_Cipher(ctx, output_buffer, input_buffer, len);
+ free(input_buffer);
+ EVP_CIPHER_CTX_free(ctx);
+ /*
+ * XXX - of course this is wrong, because buf is a
+ * const buffer, but changing this would require a
+ * more complicated fix.
+ */
+ memcpy(p + ivlen, output_buffer, len);
+ free(output_buffer);
+ advance = ivoff - (const u_char *)esp + ivlen;
+ } else
+ advance = sizeof(struct newesp);
} else
advance = sizeof(struct newesp);
- ep = ep - sa->authlen;
/* sanity check for pad length */
if (ep - bp < *(ep - 2))
goto fail;
if (nhdr)
*nhdr = *(ep - 1);
- printf(": ");
+ ND_PRINT((ndo, ": "));
return advance;
#endif
fail:
return -1;
}
+#ifdef HAVE_LIBCRYPTO
+USES_APPLE_RST
+#endif
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */
projects / tcpdump / blobdiff