* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.33 2003-02-26 18:58:05 mcr 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
-#include <openssl/des.h>
-#include <openssl/blowfish.h>
-#ifdef HAVE_OPENSSL_RC5_H
-#include <openssl/rc5.h>
-#endif
-#ifdef HAVE_OPENSSL_CAST_H
-#include <openssl/cast.h>
+#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
-#define AVOID_CHURN 1
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
-enum cipher { NONE,
- DESCBC,
- BLOWFISH,
- RC5,
- CAST128,
- DES3CBC};
-
+/*
+ * 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 esp_algorithm {
- const char *name;
- enum cipher algo;
- int ivlen;
- int authlen;
- int replaysize; /* number of bytes, in excess of 4,
- may be negative */
+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 */
};
-struct esp_algorithm esp_xforms[]={
- {"none", NONE, 0, 0, 0},
- {"des-cbc", DESCBC, 8, 0, 0},
- {"des-cbc-hmac96", DESCBC, 8, 12, 0},
- {"blowfish-cbc", BLOWFISH,8, 0, 0},
- {"blowfish-cbc-hmac96", BLOWFISH,8, 12, 0},
- {"rc5-cbc", RC5, 8, 0, 0},
- {"rc5-cbc-hmac96", RC5, 8, 12, 0},
- {"cast128-cbc", CAST128, 8, 0, 0},
- {"cast128-cbc-hmac96", CAST128, 8, 12, 0},
- {"3des-cbc-hmac96", DES3CBC, 8, 12, 0},
- {NULL, NONE, 0, 0, 0}
+#ifdef HAVE_LIBCRYPTO
+union inaddr_u {
+ struct in_addr in4;
+#ifdef INET6
+ struct in6_addr in6;
+#endif
};
-
-struct esp_algorithm *null_xf =
- &esp_xforms[sizeof(esp_xforms)/sizeof(esp_xforms[0]) - 1];
-
struct sa_list {
- struct sa_list *next;
- uint32_t daddr;
- uint32_t spi;
- struct esp_algorithm *xform;
- char secret[256]; /* is that big enough for all secrets? */
- int secretlen;
+ struct sa_list *next;
+ 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;
};
-static struct sa_list *sa_list_head=NULL;
-static struct sa_list *sa_default=NULL;
+/*
+ * 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;
-static void esp_print_addsa(struct sa_list *sa, int sa_def)
+ 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)
{
- /* copy the "sa" */
+ /* copy the "sa" */
- struct sa_list *nsa;
+ struct sa_list *nsa;
- nsa = (struct sa_list *)malloc(sizeof(struct sa_list));
- if(nsa == NULL ) {
- fprintf(stderr, "%s: ran out of memory (%d) to allocate sa structure\n",
- program_name, sizeof(struct sa_list));
- exit(2);
- }
+ nsa = (struct sa_list *)malloc(sizeof(struct sa_list));
+ if (nsa == NULL)
+ (*ndo->ndo_error)(ndo, "ran out of memory to allocate sa structure");
- *nsa = *sa;
+ *nsa = *sa;
- if(sa_def) {
- sa_default = nsa;
- }
+ if (sa_def)
+ 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') {
+ if (hex >= '0' && hex <= '9')
return (hex - '0');
- } else if(hex >= 'A' && hex <= 'F') {
+ else if (hex >= 'A' && hex <= 'F')
return (hex - 'A' + 10);
- } else if(hex >= 'a' && hex <= 'f') {
+ else if (hex >= 'a' && hex <= 'f')
return (hex - 'a' + 10);
- } else {
- printf("invalid hex digit %c in espsecret\n", hex);
+ else {
+ (*ndo->ndo_error)(ndo, "invalid hex digit %c in espsecret\n", hex);
return 0;
}
}
-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 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
+ * 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 esp_algorithm *xf;
- struct sa_list sa1;
- int sa_def;
-
- char *spikey;
- char *decode;
-
- spikey = strsep(&line, " \t");
- sa_def = 0;
- memset(&sa1, 0, sizeof(struct sa_list));
-
- /* if there is only one token, then it is an algo:key token */
- if(line == NULL) {
- decode = spikey;
- spikey = NULL;
- sa1.daddr = 0;
- sa1.spi = 0;
- sa_def = 1;
- } else {
- decode = line;
- }
-
- if(spikey && strcasecmp(spikey, "file")==0) {
- /* open file and read it */
- FILE *secretfile;
- char fileline[1024];
- char *nl;
-
- secretfile=fopen(line, "r");
- if(secretfile == NULL) {
- perror(line);
- exit(3);
- }
-
- while(fgets(fileline, 1024, secretfile) != NULL) {
-
- /* remove newline from the line */
- nl = strchr(fileline, '\n');
- if(nl) {
- *nl = '\0';
- }
- if(fileline[0]=='#') continue;
- if(fileline[0]=='\0') continue;
-
- esp_print_decode_onesecret(fileline);
- }
- fclose(secretfile);
-
- return;
- }
-
- if(spikey) {
- char *spistr, *foo;
- u_int32_t spino;
- struct in_addr ina;
-
- spistr = strsep(&spikey, "@");
-
- spino = strtoul(spistr, &foo, 0);
- if(spistr == foo) {
- printf("print_esp: failed to decode spi# %s\n", foo);
- return;
- }
-
- if(inet_pton(AF_INET, spikey, &ina) <= 0) {
- printf("print_esp: can not decode IP# %s\n", spikey);
- return;
- }
-
- sa1.daddr = ina.s_addr;
- sa1.spi = spino;
- }
-
- if(decode) {
- char *colon;
- char espsecret_key[256];
- unsigned int len, i;
-
- /* skip any blank spaces */
- while(isspace(*decode)) decode++;
-
- colon = strchr(decode, ':');
- if(colon == NULL) {
- printf("failed to decode espsecret: %s\n", decode);
- return;
- }
-
- len = colon - decode;
- xf = esp_xforms;
- while(xf->name && strncasecmp(decode, xf->name, len)!=0) {
- xf++;
- }
- if(xf->name == NULL) {
- printf("failed to find cipher algo %s\n", decode);
- /* set to NULL transform */
- return;
- }
- sa1.xform = xf;
-
- 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, espsecret_key, i);
- sa1.secretlen = i;
- } else {
- memcpy(sa1.secret, espsecret_key, sizeof(sa1.secret));
- sa1.secretlen = sizeof(sa1.secret);
- }
- }
-
- }
-
- esp_print_addsa(&sa1, sa_def);
+ struct sa_list sa1;
+ int sa_def;
+
+ char *spikey;
+ char *decode;
+
+ spikey = strsep(&line, " \t");
+ sa_def = 0;
+ memset(&sa1, 0, sizeof(struct sa_list));
+
+ /* if there is only one token, then it is an algo:key token */
+ 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) {
+ /* open file and read it */
+ FILE *secretfile;
+ char fileline[1024];
+ int lineno=0;
+ char *nl;
+ char *filename = line;
+
+ secretfile = fopen(filename, FOPEN_READ_TXT);
+ if (secretfile == NULL) {
+ perror(filename);
+ exit(3);
+ }
+
+ while (fgets(fileline, sizeof(fileline)-1, secretfile) != NULL) {
+ lineno++;
+ /* remove newline from the line */
+ nl = strchr(fileline, '\n');
+ if (nl)
+ *nl = '\0';
+ if (fileline[0] == '#') continue;
+ if (fileline[0] == '\0') continue;
+
+ 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;
+
+ spistr = strsep(&spikey, "@");
+
+ spino = strtoul(spistr, &foo, 0);
+ if (spistr == foo || !spikey) {
+ (*ndo->ndo_warning)(ndo, "print_esp: failed to decode spi# %s\n", foo);
+ return;
+ }
+
+ sa1.spi = spino;
+
+#ifdef INET6
+ if (inet_pton(AF_INET6, spikey, &sa1.daddr.in6) == 1) {
+ sa1.daddr_version = 6;
+ } else
+#endif
+ 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) {
+ /* skip any blank spaces */
+ while (isspace((unsigned char)*decode))
+ decode++;
+
+ if(!espprint_decode_encalgo(ndo, decode, &sa1)) {
+ return;
+ }
+ }
+
+ esp_print_addsa(ndo, &sa1, sa_def);
}
+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
-static void esp_print_decodesecret(void)
+void esp_print_decodesecret(netdissect_options *ndo)
{
- char *line;
- char *p;
-
- if(espsecret == NULL) {
- sa_list_head = NULL;
- return;
- }
-
- if(sa_list_head != NULL) {
- return;
- }
-
- p=espsecret;
-
- while(espsecret && espsecret[0]!='\0') {
- /* pick out the first line or first thing until a comma */
- if((line = strsep(&espsecret, "\n,"))==NULL) {
- line=espsecret;
- espsecret=NULL;
- }
-
- esp_print_decode_onesecret(line);
- }
+ char *line;
+ char *p;
+ static int initialized = 0;
+
+ if (!initialized) {
+ esp_init(ndo);
+ initialized = 1;
+ }
+
+ p = ndo->ndo_espsecret;
+
+ while (p && p[0] != '\0') {
+ /* pick out the first line or first thing until a comma */
+ if ((line = strsep(&p, "\n,")) == NULL) {
+ line = p;
+ p = NULL;
+ }
+
+ esp_print_decode_onesecret(ndo, line, "cmdline", 0);
+ }
+
+ ndo->ndo_espsecret = NULL;
}
+#endif
+
+#ifdef HAVE_LIBCRYPTO
+USES_APPLE_DEPRECATED_API
+#endif
int
-esp_print(register const u_char *bp, register const u_char *bp2,
- int *nhdr, int *padlen)
+esp_print(netdissect_options *ndo,
+ const u_char *bp, const int length, const u_char *bp2
+#ifndef HAVE_LIBCRYPTO
+ _U_
+#endif
+ ,
+ int *nhdr
+#ifndef HAVE_LIBCRYPTO
+ _U_
+#endif
+ ,
+ int *padlen
+#ifndef HAVE_LIBCRYPTO
+ _U_
+#endif
+ )
{
register const struct newesp *esp;
register const u_char *ep;
- struct ip *ip = NULL;
- struct sa_list *sa;
- int espsecret_keylen;
+#ifdef HAVE_LIBCRYPTO
+ struct ip *ip;
+ struct sa_list *sa = NULL;
#ifdef INET6
struct ip6_hdr *ip6 = NULL;
#endif
int advance;
int len;
- char *secret;
+ u_char *secret;
int ivlen = 0;
u_char *ivoff;
-#ifdef HAVE_LIBCRYPTO
u_char *p;
+ EVP_CIPHER_CTX ctx;
#endif
esp = (struct newesp *)bp;
+
+#ifdef HAVE_LIBCRYPTO
secret = NULL;
advance = 0;
+#endif
#if 0
/* keep secret out of a register */
#endif
/* 'ep' points to the end of available data. */
- ep = snapend;
+ ep = ndo->ndo_snapend;
if ((u_char *)(esp + 1) >= ep) {
fputs("[|ESP]", stdout);
goto fail;
}
- printf("ESP(spi=0x%08x", EXTRACT_32BITS(&esp->esp_spi));
- printf(",seq=0x%x", EXTRACT_32BITS(&esp->esp_seq));
- printf(")");
-
- /* if we don't have decryption key, we can't decrypt this packet. */
- if(sa_list_head == NULL) {
- if (!espsecret) {
- goto fail;
- }
- esp_print_decodesecret();
+ (*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(sa_list_head == NULL) {
+ 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;
- ip = NULL;
/* 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) {
+ 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)
goto fail;
-#ifdef INET6
- ip6 = NULL;
-#endif
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) {
+ 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;
+ }
+ }
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;
ep = bp2 + len;
}
- /* see if we can find the SA, and if so, decode it */
- sa = sa_list_head;
- while(sa != NULL &&
- sa->daddr != ip->ip_dst.s_addr &&
- sa->spi != ntohl(esp->esp_spi)) {
- sa = sa->next;
- }
-
- /* if we didn't find the specific one, then look for
- * an unspecified one.
- */
- if(sa == NULL) {
- sa = sa_default;
- }
-
- /* if not found fail */
- if(sa == NULL) goto fail;
-
- ivoff = (u_char *)(esp + 1) + sa->xform->replaysize;
- ivlen = sa->xform->ivlen;
+ ivoff = (u_char *)(esp + 1) + 0;
+ ivlen = sa->ivlen;
secret = sa->secret;
- espsecret_keylen = sa->secretlen;
+ ep = ep - sa->authlen;
- switch (sa->xform->algo) {
- case DESCBC:
-#ifdef HAVE_LIBCRYPTO
- {
- u_char iv[8];
-#if OPENSSL_VERSION_NUMBER >= 0x00907000L
- DES_key_schedule schedule;
-#else
- des_key_schedule schedule;
-#endif
+ 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");
- switch (ivlen) {
- case 4:
- memcpy(iv, ivoff, 4);
- memcpy(&iv[4], ivoff, 4);
- p = &iv[4];
- *p++ ^= 0xff;
- *p++ ^= 0xff;
- *p++ ^= 0xff;
- *p++ ^= 0xff;
- break;
- case 8:
- memcpy(iv, ivoff, 8);
- break;
- default:
- goto fail;
- }
- p = ivoff + ivlen;
-
- if (espsecret_keylen != 8)
- goto fail;
-#if OPENSSL_VERSION_NUMBER >= 0x00907000L
- DES_set_key_unchecked((DES_cblock *)secret, schedule);
-
- DES_cbc_encrypt((const unsigned char *)p, p,
- (long)(ep - p), schedule, (DES_cblock *)iv,
- DES_DECRYPT);
-#else
- des_check_key = 0;
- des_set_key((void *)secret, schedule);
-
- des_cbc_encrypt((void *)p, (void *)p,
- (long)(ep - p), schedule, (void *)iv,
- DES_DECRYPT);
-#endif
- advance = ivoff - (u_char *)esp + ivlen;
- break;
- }
-#else
- goto fail;
-#endif /*HAVE_LIBCRYPTO*/
-
- case BLOWFISH:
-#ifdef HAVE_LIBCRYPTO
- {
- BF_KEY schedule;
-
- if (espsecret_keylen < 5 || espsecret_keylen > 56)
- goto fail;
- BF_set_key(&schedule, espsecret_keylen, secret);
-
- p = ivoff + ivlen;
- BF_cbc_encrypt(p, p, (long)(ep - p), &schedule, ivoff,
- BF_DECRYPT);
- advance = ivoff - (u_char *)esp + ivlen;
- break;
- }
-#else
- goto fail;
-#endif /*HAVE_LIBCRYPTO*/
-
- case RC5:
-#if defined(HAVE_LIBCRYPTO) && defined(HAVE_RC5_H)
- {
- RC5_32_KEY schedule;
-
- if (espsecret_keylen < 5 || espsecret_keylen > 255)
- goto fail;
- RC5_32_set_key(&schedule, espsecret_keylen, secret,
- RC5_16_ROUNDS);
-
- p = ivoff + ivlen;
- RC5_32_cbc_encrypt(p, p, (long)(ep - p), &schedule, ivoff,
- RC5_DECRYPT);
- advance = ivoff - (u_char *)esp + ivlen;
- break;
- }
-#else
- goto fail;
-#endif /*HAVE_LIBCRYPTO*/
-
- case CAST128:
-#if defined(HAVE_LIBCRYPTO) && defined(HAVE_CAST_H) && !defined(HAVE_BUGGY_CAST128)
- {
- CAST_KEY schedule;
-
- if (espsecret_keylen < 5 || espsecret_keylen > 16)
- goto fail;
- CAST_set_key(&schedule, espsecret_keylen, secret);
-
- p = ivoff + ivlen;
- CAST_cbc_encrypt(p, p, (long)(ep - p), &schedule, ivoff,
- CAST_DECRYPT);
- advance = ivoff - (u_char *)esp + ivlen;
- break;
- }
-#else
- goto fail;
-#endif /*HAVE_LIBCRYPTO*/
-
- case DES3CBC:
-#if defined(HAVE_LIBCRYPTO)
- {
-#if OPENSSL_VERSION_NUMBER >= 0x00907000L
- DES_key_schedule s1, s2, s3;
-
- if (espsecret_keylen != 24)
- goto fail;
- DES_set_odd_parity((DES_cblock *)secret);
- DES_set_odd_parity((DES_cblock *)(secret + 8));
- DES_set_odd_parity((DES_cblock *)(secret + 16));
- if(DES_set_key_checked((DES_cblock *)secret, s1) != 0) {
- printf("failed to schedule key 1\n");
- }
- if(DES_set_key_checked((DES_cblock *)(secret + 8), s2)!=0) {
- printf("failed to schedule key 2\n");
- }
- if(DES_set_key_checked((DES_cblock *)(secret + 16), s3)!=0) {
- printf("failed to schedule key 3\n");
- }
-
- p = ivoff + ivlen;
- DES_ede3_cbc_encrypt((const unsigned char *)p, p,
- (long)(ep - p),
- &s1, &s2, &s3,
- (DES_cblock *)ivoff, DES_DECRYPT);
-#else
- des_key_schedule s1, s2, s3;
-
- if (espsecret_keylen != 24)
- goto fail;
- des_check_key = 1;
- des_set_odd_parity((void *)secret);
- des_set_odd_parity((void *)(secret + 8));
- des_set_odd_parity((void *)(secret + 16));
- if(des_set_key((void *)secret, s1) != 0) {
- printf("failed to schedule key 1\n");
- }
- if(des_set_key((void *)(secret + 8), s2)!=0) {
- printf("failed to schedule key 2\n");
- }
- if(des_set_key((void *)(secret + 16), s3)!=0) {
- printf("failed to schedule key 3\n");
- }
-
- p = ivoff + ivlen;
- des_ede3_cbc_encrypt((void *)p, (void *)p,
- (long)(ep - p),
- s1, s2, s3,
- (void *)ivoff, DES_DECRYPT);
-#endif
+ 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;
- break;
- }
-#else
- goto fail;
-#endif /*HAVE_LIBCRYPTO*/
-
- case NONE:
- default:
- advance = sizeof(struct newesp) + sa->xform->replaysize;
- break;
- }
+ } else
+ advance = sizeof(struct newesp);
- ep = ep - sa->xform->authlen;
/* sanity check for pad length */
if (ep - bp < *(ep - 2))
goto fail;
if (nhdr)
*nhdr = *(ep - 1);
- printf(": ");
+ (ndo->ndo_printf)(ndo, ": ");
return advance;
+#endif
fail:
- if (nhdr)
- *nhdr = -1;
- return 65536;
+ return -1;
}
+#ifdef HAVE_LIBCRYPTO
+USES_APPLE_RST
+#endif
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */
projects / tcpdump / blobdiff