| 1 |
diff -up openssl-fips-0.9.8e/ssl/s3_srvr.c.sgc-dos openssl-fips-0.9.8e/ssl/s3_srvr.c |
| 2 |
--- openssl-fips-0.9.8e/ssl/s3_srvr.c.sgc-dos 2012-03-19 17:42:34.490429863 +0100 |
| 3 |
+++ openssl-fips-0.9.8e/ssl/s3_srvr.c 2012-03-19 17:44:42.928114348 +0100 |
| 4 |
@@ -236,6 +236,7 @@ int ssl3_accept(SSL *s) |
| 5 |
} |
| 6 |
|
| 7 |
s->init_num=0; |
| 8 |
+ s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE; |
| 9 |
|
| 10 |
if (s->state != SSL_ST_RENEGOTIATE) |
| 11 |
{ |
| 12 |
@@ -655,6 +656,13 @@ int ssl3_check_client_hello(SSL *s) |
| 13 |
s->s3->tmp.reuse_message = 1; |
| 14 |
if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO) |
| 15 |
{ |
| 16 |
+ /* We only allow the client to restart the handshake once per |
| 17 |
+ * negotiation. */ |
| 18 |
+ if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE) |
| 19 |
+ { |
| 20 |
+ SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS); |
| 21 |
+ return -1; |
| 22 |
+ } |
| 23 |
/* Throw away what we have done so far in the current handshake, |
| 24 |
* which will now be aborted. (A full SSL_clear would be too much.) |
| 25 |
* I hope that tmp.dh is the only thing that may need to be cleared |
| 26 |
@@ -666,6 +674,7 @@ int ssl3_check_client_hello(SSL *s) |
| 27 |
s->s3->tmp.dh = NULL; |
| 28 |
} |
| 29 |
#endif |
| 30 |
+ s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE; |
| 31 |
return 2; |
| 32 |
} |
| 33 |
return 1; |
| 34 |
diff -up openssl-fips-0.9.8e/ssl/ssl3.h.sgc-dos openssl-fips-0.9.8e/ssl/ssl3.h |
| 35 |
--- openssl-fips-0.9.8e/ssl/ssl3.h.sgc-dos 2012-03-19 17:42:34.465429341 +0100 |
| 36 |
+++ openssl-fips-0.9.8e/ssl/ssl3.h 2012-03-19 17:42:34.532430741 +0100 |
| 37 |
@@ -333,6 +333,17 @@ typedef struct ssl3_buffer_st |
| 38 |
#define SSL3_FLAGS_DELAY_CLIENT_FINISHED 0x0002 |
| 39 |
#define SSL3_FLAGS_POP_BUFFER 0x0004 |
| 40 |
#define TLS1_FLAGS_TLS_PADDING_BUG 0x0008 |
| 41 |
+ |
| 42 |
+/* SSL3_FLAGS_SGC_RESTART_DONE is set when we |
| 43 |
+ * restart a handshake because of MS SGC and so prevents us |
| 44 |
+ * from restarting the handshake in a loop. It's reset on a |
| 45 |
+ * renegotiation, so effectively limits the client to one restart |
| 46 |
+ * per negotiation. This limits the possibility of a DDoS |
| 47 |
+ * attack where the client handshakes in a loop using SGC to |
| 48 |
+ * restart. Servers which permit renegotiation can still be |
| 49 |
+ * effected, but we can't prevent that. |
| 50 |
+ */ |
| 51 |
+#define SSL3_FLAGS_SGC_RESTART_DONE 0x0040 |
| 52 |
|
| 53 |
typedef struct ssl3_state_st |
| 54 |
{ |
| 55 |
diff -up openssl-fips-0.9.8e/ssl/ssl_err.c.sgc-dos openssl-fips-0.9.8e/ssl/ssl_err.c |
| 56 |
--- openssl-fips-0.9.8e/ssl/ssl_err.c.sgc-dos 2012-03-19 17:42:34.462429280 +0100 |
| 57 |
+++ openssl-fips-0.9.8e/ssl/ssl_err.c 2012-03-19 17:42:34.532430741 +0100 |
| 58 |
@@ -134,6 +134,7 @@ static ERR_STRING_DATA SSL_str_functs[]= |
| 59 |
{ERR_FUNC(SSL_F_SSL3_CALLBACK_CTRL), "SSL3_CALLBACK_CTRL"}, |
| 60 |
{ERR_FUNC(SSL_F_SSL3_CHANGE_CIPHER_STATE), "SSL3_CHANGE_CIPHER_STATE"}, |
| 61 |
{ERR_FUNC(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM), "SSL3_CHECK_CERT_AND_ALGORITHM"}, |
| 62 |
+{ERR_FUNC(SSL_F_SSL3_CHECK_CLIENT_HELLO), "SSL3_CHECK_CLIENT_HELLO"}, |
| 63 |
{ERR_FUNC(SSL_F_SSL3_CLIENT_HELLO), "SSL3_CLIENT_HELLO"}, |
| 64 |
{ERR_FUNC(SSL_F_SSL3_CONNECT), "SSL3_CONNECT"}, |
| 65 |
{ERR_FUNC(SSL_F_SSL3_CTRL), "SSL3_CTRL"}, |
| 66 |
@@ -361,6 +362,7 @@ static ERR_STRING_DATA SSL_str_reasons[] |
| 67 |
{ERR_REASON(SSL_R_MISSING_TMP_RSA_KEY) ,"missing tmp rsa key"}, |
| 68 |
{ERR_REASON(SSL_R_MISSING_TMP_RSA_PKEY) ,"missing tmp rsa pkey"}, |
| 69 |
{ERR_REASON(SSL_R_MISSING_VERIFY_MESSAGE),"missing verify message"}, |
| 70 |
+{ERR_REASON(SSL_R_MULTIPLE_SGC_RESTARTS) ,"multiple sgc restarts"}, |
| 71 |
{ERR_REASON(SSL_R_NON_SSLV2_INITIAL_PACKET),"non sslv2 initial packet"}, |
| 72 |
{ERR_REASON(SSL_R_NO_CERTIFICATES_RETURNED),"no certificates returned"}, |
| 73 |
{ERR_REASON(SSL_R_NO_CERTIFICATE_ASSIGNED),"no certificate assigned"}, |
| 74 |
diff -up openssl-fips-0.9.8e/ssl/ssl.h.sgc-dos openssl-fips-0.9.8e/ssl/ssl.h |
| 75 |
--- openssl-fips-0.9.8e/ssl/ssl.h.sgc-dos 2012-03-19 17:42:34.488429820 +0100 |
| 76 |
+++ openssl-fips-0.9.8e/ssl/ssl.h 2012-03-19 17:42:34.533430762 +0100 |
| 77 |
@@ -1634,6 +1634,7 @@ void ERR_load_SSL_strings(void); |
| 78 |
#define SSL_F_SSL3_CALLBACK_CTRL 233 |
| 79 |
#define SSL_F_SSL3_CHANGE_CIPHER_STATE 129 |
| 80 |
#define SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM 130 |
| 81 |
+#define SSL_F_SSL3_CHECK_CLIENT_HELLO 293 |
| 82 |
#define SSL_F_SSL3_CLIENT_HELLO 131 |
| 83 |
#define SSL_F_SSL3_CONNECT 132 |
| 84 |
#define SSL_F_SSL3_CTRL 213 |
| 85 |
@@ -1858,6 +1859,7 @@ void ERR_load_SSL_strings(void); |
| 86 |
#define SSL_R_MISSING_TMP_RSA_KEY 172 |
| 87 |
#define SSL_R_MISSING_TMP_RSA_PKEY 173 |
| 88 |
#define SSL_R_MISSING_VERIFY_MESSAGE 174 |
| 89 |
+#define SSL_R_MULTIPLE_SGC_RESTARTS 325 |
| 90 |
#define SSL_R_NON_SSLV2_INITIAL_PACKET 175 |
| 91 |
#define SSL_R_NO_CERTIFICATES_RETURNED 176 |
| 92 |
#define SSL_R_NO_CERTIFICATE_ASSIGNED 177 |
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