#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.40 2003-07-17 11:01:06 itojun Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.42 2003-07-17 13:43:24 itojun Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include <stdlib.h>
#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>
#endif
#endif
#endif
#if defined(__MINGW32__) || defined(__WATCOMC__)
-extern char *strsep (char **stringp, const char *delim); /* Missing/strsep.c */
+extern char *strsep(char **stringp, const char *delim); /* Missing/strsep.c */
#endif
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
-enum cipher { NONE, DESCBC, BLOWFISH, RC5, CAST128, DES3CBC};
-
-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 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}
-};
-
-struct esp_algorithm *null_xf =
- &esp_xforms[sizeof(esp_xforms)/sizeof(esp_xforms[0]) - 1];
-
#ifndef HAVE_SOCKADDR_STORAGE
#ifdef INET6
struct sockaddr_storage {
#endif
#endif /* HAVE_SOCKADDR_STORAGE */
+#ifdef HAVE_LIBCRYPTO
struct sa_list {
struct sa_list *next;
struct sockaddr_storage daddr;
u_int32_t spi;
- struct esp_algorithm *xform;
+ const EVP_CIPHER *evp;
+ int ivlen;
+ int authlen;
char secret[256]; /* is that big enough for all secrets? */
int secretlen;
};
nsa->next = sa_list_head;
sa_list_head = nsa;
}
-
+
static int hexdigit(char hex)
{
return byte;
}
-/*
+/*
* decode the form: SPINUM@IP <tab> ALGONAME:0xsecret
*
- * 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)
{
- struct esp_algorithm *xf;
struct sa_list sa1;
int sa_def;
}
if (decode) {
- char *colon;
+ char *colon, *p;
char espsecret_key[256];
- unsigned int len, i;
+ int len, i;
+ const EVP_CIPHER *evp;
+ int ivlen = 8;
+ int authlen = 0;
/* skip any blank spaces */
while (isspace((unsigned char)*decode))
printf("failed to decode espsecret: %s\n", decode);
return;
}
+ *colon = '\0';
len = colon - decode;
- xf = esp_xforms;
- while (xf->name && strncasecmp(decode, xf->name, len) != 0)
- xf++;
- if (xf->name == NULL) {
+ 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);
- /* set to NULL transform */
+ sa1.evp = NULL;
+ sa1.authlen = 0;
+ sa1.ivlen = 0;
return;
}
- sa1.xform = xf;
+
+ sa1.evp = evp;
+ sa1.authlen = authlen;
+ sa1.ivlen = ivlen;
colon++;
if (colon[0] == '0' && colon[1] == 'x') {
colon += 2;
i++;
}
+
memcpy(sa1.secret, espsecret_key, i);
- sa1.secretlen=i;
+ sa1.secretlen = i;
} else {
i = strlen(colon);
+
if (i < sizeof(sa1.secret)) {
- memcpy(sa1.secret, espsecret_key, i);
+ memcpy(sa1.secret, colon, i);
sa1.secretlen = i;
} else {
- memcpy(sa1.secret, espsecret_key,
- sizeof(sa1.secret));
+ memcpy(sa1.secret, colon, sizeof(sa1.secret));
sa1.secretlen = sizeof(sa1.secret);
}
}
esp_print_addsa(&sa1, sa_def);
}
-
static void esp_print_decodesecret(void)
{
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') {
+ while (espsecret && espsecret[0] != '\0') {
/* pick out the first line or first thing until a comma */
if ((line = strsep(&espsecret, "\n,")) == NULL) {
line = espsecret;
}
}
+static void esp_init(void)
+{
+
+ OpenSSL_add_all_algorithms();
+ EVP_add_cipher_alias(SN_des_ede3_cbc, "3des");
+}
+#endif
+
int
-esp_print(register const u_char *bp, register const u_char *bp2,
- int *nhdr, int *padlen)
+esp_print(const u_char *bp, const u_char *bp2, int *nhdr, int *padlen)
{
register const struct newesp *esp;
register const u_char *ep;
int ivlen = 0;
u_char *ivoff;
#ifdef HAVE_LIBCRYPTO
- u_char *p;
+ const u_char *p;
+ EVP_CIPHER_CTX ctx;
+ int blocksz;
+ static int initialized = 0;
#endif
esp = (struct newesp *)bp;
secret = NULL;
advance = 0;
+#ifdef HAVE_LIBCRYPTO
+ if (!initialized) {
+ esp_init();
+ initialized = 1;
+ }
+#endif
+
#if 0
/* keep secret out of a register */
p = (u_char *)&secret;
printf(",seq=0x%x", EXTRACT_32BITS(&esp->esp_seq));
printf(")");
- /* if we don't have decryption key, we can't decrypt this packet. */
+#ifndef HAVE_LIBCRYPTO
+ goto fail;
+#else
+ /* initiailize SAs */
if (sa_list_head == NULL) {
if (!espsecret)
goto fail;
+
esp_print_decodesecret();
}
/* if we didn't find the specific one, then look for
* an unspecified one.
*/
- if (sa == NULL) {
+ if (sa == NULL)
sa = sa_default;
- }
/* if not found fail */
if (sa == NULL)
ep = bp2 + len;
}
- 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;
- 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
-
- 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 (sa->evp) {
+ memset(&ctx, 0, sizeof(ctx));
+ if (EVP_CipherInit(&ctx, sa->evp, secret, NULL, 0) < 0)
+ printf("espkey init failed");
- if (espsecret_keylen != 8)
- goto fail;
-
-#if OPENSSL_VERSION_NUMBER >= 0x00908000L
- DES_set_key_unchecked((const_DES_cblock *)secret, &schedule);
-
- DES_cbc_encrypt((const unsigned char *)p, p,
- (long)(ep - p), &schedule, (DES_cblock *)iv, DES_DECRYPT);
-
-#elif 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);
+ blocksz = EVP_CIPHER_CTX_block_size(&ctx);
- des_cbc_encrypt((void *)p, (void *)p,
- (long)(ep - p), schedule, (void *)iv, DES_DECRYPT);
-#endif
+ 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;
- 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 OPENSSL_VERSION_NUMBER >= 0x00908000L
- if (DES_set_key_checked((const_DES_cblock *)secret, &s1) != 0)
- printf("failed to schedule key 1\n");
- if (DES_set_key_checked((const_DES_cblock *)(secret + 8), &s2) != 0)
- printf("failed to schedule key 2\n");
- if (DES_set_key_checked((const_DES_cblock *)(secret + 16), &s3) != 0)
- printf("failed to schedule key 3\n");
-#else
- 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");
-#endif
-
- 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
- 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;
+ ep = ep - sa->authlen;
/* sanity check for pad length */
if (ep - bp < *(ep - 2))
goto fail;
printf(": ");
return advance;
+#endif
fail:
if (nhdr)
projects / tcpdump / blobdiff