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diff -up openssl-1.0.1e/ssl/s2_lib.c.ssl2-assert openssl-1.0.1e/ssl/s2_lib.c
--- openssl-1.0.1e/ssl/s2_lib.c.ssl2-assert 2015-03-18 13:02:36.000000000 +0100
+++ openssl-1.0.1e/ssl/s2_lib.c 2015-03-18 18:22:20.195322489 +0100
@@ -488,7 +488,7 @@ int ssl2_generate_key_material(SSL *s)
OPENSSL_assert(s->session->master_key_length >= 0
&& s->session->master_key_length
- < (int)sizeof(s->session->master_key));
+ <= (int)sizeof(s->session->master_key));
EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
EVP_DigestUpdate(&ctx,&c,1);
c++;
diff -up openssl-1.0.1e/ssl/s2_srvr.c.ssl2-assert openssl-1.0.1e/ssl/s2_srvr.c
--- openssl-1.0.1e/ssl/s2_srvr.c.ssl2-assert 2013-02-11 16:26:04.000000000 +0100
+++ openssl-1.0.1e/ssl/s2_srvr.c 2015-03-18 18:30:11.403974038 +0100
@@ -446,9 +446,6 @@ static int get_client_master_key(SSL *s)
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
return(-1);
}
- i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
- &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
- (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
is_export=SSL_C_IS_EXPORT(s->session->cipher);
@@ -467,21 +464,61 @@ static int get_client_master_key(SSL *s)
else
ek=5;
+ /*
+ * The format of the CLIENT-MASTER-KEY message is
+ * 1 byte message type
+ * 3 bytes cipher
+ * 2-byte clear key length (stored in s->s2->tmp.clear)
+ * 2-byte encrypted key length (stored in s->s2->tmp.enc)
+ * 2-byte key args length (IV etc)
+ * clear key
+ * encrypted key
+ * key args
+ *
+ * If the cipher is an export cipher, then the encrypted key bytes
+ * are a fixed portion of the total key (5 or 8 bytes). The size of
+ * this portion is in |ek|. If the cipher is not an export cipher,
+ * then the entire key material is encrypted (i.e., clear key length
+ * must be zero).
+ */
+ if ((!is_export && s->s2->tmp.clear != 0) ||
+ (is_export && s->s2->tmp.clear + ek != EVP_CIPHER_key_length(c)))
+ {
+ ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
+ SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
+ return -1;
+ }
+ /*
+ * The encrypted blob must decrypt to the encrypted portion of the key.
+ * Decryption can't be expanding, so if we don't have enough encrypted
+ * bytes to fit the key in the buffer, stop now.
+ */
+ if ((is_export && s->s2->tmp.enc < ek) ||
+ (!is_export && s->s2->tmp.enc < EVP_CIPHER_key_length(c)))
+ {
+ ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
+ SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
+ return -1;
+ }
+
+ i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
+ &(p[s->s2->tmp.clear]),
+ &(p[s->s2->tmp.clear]),
+ (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING : RSA_PKCS1_PADDING);
+
/* bad decrypt */
#if 1
/* If a bad decrypt, continue with protocol but with a
* random master secret (Bleichenbacher attack) */
- if ((i < 0) ||
- ((!is_export && (i != EVP_CIPHER_key_length(c)))
- || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=
- (unsigned int)EVP_CIPHER_key_length(c))))))
+ if ((i < 0) || ((!is_export && i != EVP_CIPHER_key_length(c))
+ || (is_export && i != ek)))
{
ERR_clear_error();
if (is_export)
i=ek;
else
i=EVP_CIPHER_key_length(c);
- if (RAND_pseudo_bytes(p,i) <= 0)
+ if (RAND_pseudo_bytes(&p[s->s2->tmp.clear],i) <= 0)
return 0;
}
#else
@@ -505,7 +542,8 @@ static int get_client_master_key(SSL *s)
}
#endif
- if (is_export) i+=s->s2->tmp.clear;
+ if (is_export)
+ i = EVP_CIPHER_key_length(c);
if (i > SSL_MAX_MASTER_KEY_LENGTH)
{