*/
#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)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.51 2004-04-10 08:41:22 guy 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 "netdissect.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;
};
-static struct sa_list *sa_list_head = NULL;
-static struct sa_list *sa_default = NULL;
-
-static void esp_print_addsa(struct sa_list *sa, int sa_def)
+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 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);
+ (*ndo->ndo_error)(ndo, "invalid hex digit %c in espsecret\n", hex);
return 0;
}
}
-static int hex2byte(char *hexstring)
+static int hex2byte(netdissect_options *ndo, char *hexstring)
{
int byte;
- byte = (hexdigit(hexstring[0]) << 4) + hexdigit(hexstring[1]);
+ byte = (hexdigit(ndo, hexstring[0]) << 4) + hexdigit(ndo, hexstring[1]);
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)
+static void esp_print_decode_onesecret(netdissect_options *ndo, char *line)
{
- struct esp_algorithm *xf;
struct sa_list sa1;
int sa_def;
if (fileline[0] == '#') continue;
if (fileline[0] == '\0') continue;
- esp_print_decode_onesecret(fileline);
+ esp_print_decode_onesecret(ndo, fileline);
}
fclose(secretfile);
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;
}
#endif
sin->sin_family = AF_INET;
} 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;
+ char *colon, *p;
char espsecret_key[256];
- unsigned int len, i;
+ int len;
+ size_t i;
+ const EVP_CIPHER *evp;
+ int authlen = 0;
/* skip any blank spaces */
while (isspace((unsigned char)*decode))
colon = strchr(decode, ':');
if (colon == NULL) {
- printf("failed to decode espsecret: %s\n", decode);
+ (*ndo->ndo_warning)(ndo, "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) {
- printf("failed to find cipher algo %s\n", decode);
- /* set to NULL transform */
+ 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;
return;
}
- sa1.xform = xf;
+
+ sa1.evp = evp;
+ sa1.authlen = authlen;
+ sa1.ivlen = EVP_CIPHER_iv_length(evp);
colon++;
if (colon[0] == '0' && colon[1] == 'x') {
len = strlen(colon) / 2;
if (len > 256) {
- printf("secret is too big: %d\n", len);
+ (*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(colon);
+ espsecret_key[i] = hex2byte(ndo, colon);
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);
+ esp_print_addsa(ndo, &sa1, sa_def);
}
-
-static void esp_print_decodesecret(void)
+static 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 = ndo->ndo_espsecret;
- p = espsecret;
-
- while (espsecret && espsecret[0] != '\0') {
+ while (ndo->ndo_espsecret && ndo->ndo_espsecret[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(&ndo->ndo_espsecret, "\n,")) == NULL) {
+ line = ndo->ndo_espsecret;
+ ndo->ndo_espsecret = NULL;
}
- esp_print_decode_onesecret(line);
+ esp_print_decode_onesecret(ndo, line);
}
}
+static void esp_init(netdissect_options *ndo _U_)
+{
+
+ 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(netdissect_options *ndo,
+ const u_char *bp, 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;
+#ifdef HAVE_LIBCRYPTO
struct ip *ip;
struct sa_list *sa = NULL;
int espsecret_keylen;
char *secret;
int ivlen = 0;
u_char *ivoff;
-#ifdef HAVE_LIBCRYPTO
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
/* keep secret out of a register */
p = (u_char *)&secret;
#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(")");
+ (*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));
- /* if we don't have decryption key, we can't decrypt this packet. */
- if (sa_list_head == NULL) {
- if (!espsecret)
+#ifndef HAVE_LIBCRYPTO
+ goto fail;
+#else
+ /* initiailize SAs */
+ 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;
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) {
+ 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 &&
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) {
+ 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 &&
/* if we didn't find the specific one, then look for
* an unspecified one.
*/
- if (sa == NULL) {
- sa = sa_default;
- }
+ if (sa == NULL)
+ sa = ndo->ndo_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;
+ 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
-
- 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 >= 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);
+ 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");
-#elif OPENSSL_VERSION_NUMBER >= 0x00907000L
- DES_set_key_unchecked((DES_cblock *)secret, schedule);
+ blocksz = EVP_CIPHER_CTX_block_size(&ctx);
- 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);
+ 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 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;
/* 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;
}
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */
projects / tcpdump / blobdiff