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1c84f87057
dsniff/dsniff-2.4-openssl_110.patch
Robert Scheck 1c84f87057 - Added patch to allow building dsniff with OpenSSL >= 1.1.0 
- Added patch to correct a typo related to the -remote option
2017-02-11 23:07:46 +01:00

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Patch by Christoph Biedl <debian.axhn@manchmal.in-ulm.de> for dsniff >=
2.4b1, which fixes building with OpenSSL 1.1.0. Adapted for compatibility
with older OpenSSL versions by Robert Scheck <robert@fedoraproject.org>.
--- dsniff-2.4/ssh.c 2017-02-11 22:31:54.705269813 +0100
+++ dsniff-2.4/ssh.c.openssl_110 2017-02-11 22:45:31.193447230 +0100
@@ -234,6 +234,10 @@
u_char *p, cipher, cookie[8], msg[1024];
u_int32_t num;
int i;
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ const BIGNUM *servkey_e, *servkey_n;
+ const BIGNUM *hostkey_e, *hostkey_n;
+#endif
/* Generate anti-spoofing cookie. */
RAND_bytes(cookie, sizeof(cookie));
@@ -243,11 +247,23 @@
*p++ = SSH_SMSG_PUBLIC_KEY; /* type */
memcpy(p, cookie, 8); p += 8; /* cookie */
num = 768; PUTLONG(num, p); /* servkey bits */
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ RSA_get0_key(ssh->ctx->servkey, &servkey_n, &servkey_e, NULL);
+ put_bn(servkey_e, &p); /* servkey exponent */
+ put_bn(servkey_n, &p); /* servkey modulus */
+#else
put_bn(ssh->ctx->servkey->e, &p); /* servkey exponent */
put_bn(ssh->ctx->servkey->n, &p); /* servkey modulus */
+#endif
num = 1024; PUTLONG(num, p); /* hostkey bits */
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ RSA_get0_key(ssh->ctx->hostkey, &hostkey_n, &hostkey_e, NULL);
+ put_bn(hostkey_e, &p); /* hostkey exponent */
+ put_bn(hostkey_n, &p); /* hostkey modulus */
+#else
put_bn(ssh->ctx->hostkey->e, &p); /* hostkey exponent */
put_bn(ssh->ctx->hostkey->n, &p); /* hostkey modulus */
+#endif
num = 0; PUTLONG(num, p); /* protocol flags */
num = ssh->ctx->encmask; PUTLONG(num, p); /* ciphers */
num = ssh->ctx->authmask; PUTLONG(num, p); /* authmask */
@@ -298,7 +314,11 @@
SKIP(p, i, 4);
/* Decrypt session key. */
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ if (BN_cmp(servkey_n, hostkey_n) > 0) {
+#else
if (BN_cmp(ssh->ctx->servkey->n, ssh->ctx->hostkey->n) > 0) {
+#endif
rsa_private_decrypt(enckey, enckey, ssh->ctx->servkey);
rsa_private_decrypt(enckey, enckey, ssh->ctx->hostkey);
}
@@ -318,8 +338,13 @@
BN_clear_free(enckey);
/* Derive real session key using session id. */
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ if ((p = ssh_session_id(cookie, hostkey_n,
+ servkey_n)) == NULL) {
+#else
if ((p = ssh_session_id(cookie, ssh->ctx->hostkey->n,
ssh->ctx->servkey->n)) == NULL) {
+#endif
warn("ssh_session_id");
return (-1);
}
@@ -328,10 +353,15 @@
}
/* Set cipher. */
if (cipher == SSH_CIPHER_3DES) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ warnx("cipher 3des no longer supported");
+ return (-1);
+#else
ssh->estate = des3_init(ssh->sesskey, sizeof(ssh->sesskey));
ssh->dstate = des3_init(ssh->sesskey, sizeof(ssh->sesskey));
ssh->encrypt = des3_encrypt;
ssh->decrypt = des3_decrypt;
+#endif
}
else if (cipher == SSH_CIPHER_BLOWFISH) {
ssh->estate = blowfish_init(ssh->sesskey,sizeof(ssh->sesskey));
@@ -357,6 +387,10 @@
u_char *p, cipher, cookie[8], msg[1024];
u_int32_t num;
int i;
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ BIGNUM *servkey_n, *servkey_e;
+ BIGNUM *hostkey_n, *hostkey_e;
+#endif
/* Get public key. */
if ((i = SSH_recv(ssh, pkt, sizeof(pkt))) <= 0) {
@@ -379,21 +413,43 @@
/* Get servkey. */
ssh->ctx->servkey = RSA_new();
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ servkey_n = BN_new();
+ servkey_e = BN_new();
+ RSA_set0_key(ssh->ctx->servkey, servkey_n, servkey_e, NULL);
+#else
ssh->ctx->servkey->n = BN_new();
ssh->ctx->servkey->e = BN_new();
+#endif
SKIP(p, i, 4);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ get_bn(servkey_e, &p, &i);
+ get_bn(servkey_n, &p, &i);
+#else
get_bn(ssh->ctx->servkey->e, &p, &i);
get_bn(ssh->ctx->servkey->n, &p, &i);
+#endif
/* Get hostkey. */
ssh->ctx->hostkey = RSA_new();
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ hostkey_n = BN_new();
+ hostkey_e = BN_new();
+ RSA_set0_key(ssh->ctx->hostkey, hostkey_n, hostkey_e, NULL);
+#else
ssh->ctx->hostkey->n = BN_new();
ssh->ctx->hostkey->e = BN_new();
+#endif
SKIP(p, i, 4);
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ get_bn(hostkey_e, &p, &i);
+ get_bn(hostkey_n, &p, &i);
+#else
get_bn(ssh->ctx->hostkey->e, &p, &i);
get_bn(ssh->ctx->hostkey->n, &p, &i);
+#endif
/* Get cipher, auth masks. */
SKIP(p, i, 4);
@@ -405,8 +461,13 @@
RAND_bytes(ssh->sesskey, sizeof(ssh->sesskey));
/* Obfuscate with session id. */
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ if ((p = ssh_session_id(cookie, hostkey_n,
+ servkey_n)) == NULL) {
+#else
if ((p = ssh_session_id(cookie, ssh->ctx->hostkey->n,
ssh->ctx->servkey->n)) == NULL) {
+#endif
warn("ssh_session_id");
return (-1);
}
@@ -422,7 +483,11 @@
else BN_add_word(bn, ssh->sesskey[i]);
}
/* Encrypt session key. */
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ if (BN_cmp(servkey_n, hostkey_n) < 0) {
+#else
if (BN_cmp(ssh->ctx->servkey->n, ssh->ctx->hostkey->n) < 0) {
+#endif
rsa_public_encrypt(bn, bn, ssh->ctx->servkey);
rsa_public_encrypt(bn, bn, ssh->ctx->hostkey);
}
@@ -470,10 +535,15 @@
ssh->decrypt = blowfish_decrypt;
}
else if (cipher == SSH_CIPHER_3DES) {
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ warnx("cipher 3des no longer supported");
+ return (-1);
+#else
ssh->estate = des3_init(ssh->sesskey, sizeof(ssh->sesskey));
ssh->dstate = des3_init(ssh->sesskey, sizeof(ssh->sesskey));
ssh->encrypt = des3_encrypt;
ssh->decrypt = des3_decrypt;
+#endif
}
/* Get server response. */
if ((i = SSH_recv(ssh, pkt, sizeof(pkt))) <= 0) {
--- dsniff-2.4/sshcrypto.c 2017-02-11 22:31:54.688270184 +0100
+++ dsniff-2.4/sshcrypto.c.openssl_110 2017-02-11 22:35:30.594555807 +0100
@@ -28,10 +28,12 @@
u_char iv[8];
};
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
struct des3_state {
des_key_schedule k1, k2, k3;
des_cblock iv1, iv2, iv3;
};
+#endif
void
rsa_public_encrypt(BIGNUM *out, BIGNUM *in, RSA *key)
@@ -39,10 +41,20 @@
u_char *inbuf, *outbuf;
int len, ilen, olen;
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ const BIGNUM *n, *e;
+ RSA_get0_key(key, &n, &e, NULL);
+ if (BN_num_bits(e) < 2 || !BN_is_odd(e))
+#else
if (BN_num_bits(key->e) < 2 || !BN_is_odd(key->e))
+#endif
errx(1, "rsa_public_encrypt() exponent too small or not odd");
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ olen = BN_num_bytes(n);
+#else
olen = BN_num_bytes(key->n);
+#endif
outbuf = malloc(olen);
ilen = BN_num_bytes(in);
@@ -71,7 +83,13 @@
u_char *inbuf, *outbuf;
int len, ilen, olen;
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+ const BIGNUM *n;
+ RSA_get0_key(key, &n, NULL, NULL);
+ olen = BN_num_bytes(n);
+#else
olen = BN_num_bytes(key->n);
+#endif
outbuf = malloc(olen);
ilen = BN_num_bytes(in);
@@ -146,6 +164,7 @@
swap_bytes(dst, dst, len);
}
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
/* XXX - SSH1's weirdo 3DES... */
void *
des3_init(u_char *sesskey, int len)
@@ -194,3 +213,4 @@
des_ncbc_encrypt(dst, dst, len, dstate->k2, &dstate->iv2, DES_ENCRYPT);
des_ncbc_encrypt(dst, dst, len, dstate->k1, &dstate->iv1, DES_DECRYPT);
}
+#endif
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