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https://github.com/SoftEtherVPN/SoftEtherVPN.git
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Introduce DisableSslVersions.
The SSL Versions specified will be disabled on server context.
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d3a1b26413
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@ -404,7 +404,19 @@
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#define KEEP_ALIVE_MAGIC 0xffffffff
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#define MAX_KEEPALIVE_SIZE 512
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// SSL/TLS Versions
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#define SSL_VERSION_SSL_V2 0x01 // SSLv2
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#define SSL_VERSION_SSL_V3 0x02 // SSLv3
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#define SSL_VERSION_TLS_V1_0 0x04 // TLS v1.0
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#define SSL_VERSION_TLS_V1_1 0x08 // TLS v1.1
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#define SSL_VERSION_TLS_V1_2 0x10 // TLS v1.2
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// SSL/TLS Version Names
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#define NAME_SSL_VERSION_SSL_V2 "SSL_V2" // SSLv2
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#define NAME_SSL_VERSION_SSL_V3 "SSL_V3" // SSLv3
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#define NAME_SSL_VERSION_TLS_V1_0 "TLS_V1_0" // TLS v1.0
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#define NAME_SSL_VERSION_TLS_V1_0 "TLS_V1_1" // TLS v1.1
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#define NAME_SSL_VERSION_TLS_V1_0 "TLS_V1_2" // TLS v1.2
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//////////////////////////////////////////////////////////////////////
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//
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@ -1053,6 +1065,7 @@ typedef struct CEDAR
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LOCK *FifoBudgetLock; // Fifo budget lock
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UINT FifoBudget; // Fifo budget
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bool AcceptOnlyTls; // Accept only TLS (Disable SSL)
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UINT DisableSslVersions = 0x0; // Bitmap of SSL Version to disable
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char OpenVPNDefaultClientOption[MAX_SIZE]; // OpenVPN Default Client Option String
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} CEDAR;
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@ -3137,10 +3137,8 @@ void ConnectionAccept(CONNECTION *c)
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// Start the SSL communication
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Debug("StartSSL()\n");
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if (c->Cedar->AcceptOnlyTls)
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{
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s->AcceptOnlyTls = true;
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}
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s->DisableSslVersions = c->Cedar->DisableSslVersions;
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if (StartSSL(s, x, k) == false)
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{
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// Failed
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@ -6157,6 +6157,39 @@ void SiLoadServerCfg(SERVER *s, FOLDER *f)
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// AcceptOnlyTls
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c->AcceptOnlyTls = CfgGetBool(f, "AcceptOnlyTls");
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if (c->AcceptOnlyTls) {
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c->DisableSslVersions |= SSL_VERSION_SSL_V2;
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c->DisableSslVersions |= SSL_VERSION_SSL_V3;
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}
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if (CfgGetStr(f, "DisableSslVersions", tmp, sizeof(tmp))) {
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TOKEN_LIST *sslVersions= ParseToken(tmp, ", ");
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UINT i;
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for (i = 0;i < sslVersions->NumTokens;i++)
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{
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if (strcmp(tmp, NAME_SSL_VERSION_SSL_V2))
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c->DisableSslVersions |= SSL_VERSION_SSL_V2;
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continue;
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}
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if (strcmp(tmp, NAME_SSL_VERSION_SSL_V3))
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c->DisableSslVersions |= SSL_VERSION_SSL_V3;
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continue;
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}
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if (strcmp(tmp, NAME_SSL_VERSION_TLS_V1_0))
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c->DisableSslVersions |= SSL_VERSION_TLS_V1_0;
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continue;
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}
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if (strcmp(tmp, NAME_SSL_VERSION_TLS_V1_1))
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c->DisableSslVersions |= SSL_VERSION_TLS_V1_1;
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continue;
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}
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if (strcmp(tmp, NAME_SSL_VERSION_TLS_V1_2))
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c->DisableSslVersions |= SSL_VERSION_TLS_V1_2;
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continue;
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}
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}
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FreeToken(sslVersions);
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}
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}
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Unlock(c->lock);
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@ -6467,6 +6500,8 @@ void SiWriteServerCfg(FOLDER *f, SERVER *s)
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CfgAddBool(f, "AcceptOnlyTls", c->AcceptOnlyTls);
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CfgAddStr(f, "DisableSslVersions", c->DisableSslVersions);
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// Disable session reconnect
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CfgAddBool(f, "DisableSessionReconnect", GetGlobalServerFlag(GSF_DISABLE_SESSION_RECONNECT));
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}
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@ -12965,16 +12965,25 @@ bool StartSSLEx(SOCK *sock, X *x, K *priv, bool client_tls, UINT ssl_timeout, ch
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Lock(openssl_lock);
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{
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if (sock->ServerMode)
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{
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if (sock->AcceptOnlyTls == false)
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{
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SSL_CTX_set_ssl_version(ssl_ctx, SSLv23_method());
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long ssl_opt_flags=0x0L;
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if (sock->DisableSslVersions & SSL_VERSION_SSL_V2) {
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ssl_opt_flags |= SSL_OP_NO_SSLv2;
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}
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else
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{
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SSL_CTX_set_ssl_version(ssl_ctx, TLSv1_method());
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if (sock->DisableSslVersions & SSL_VERSION_SSL_V3) {
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ssl_opt_flags |= SSL_OP_NO_SSLv3;
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}
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if (sock->DisableSslVersions & SSL_VERSION_TLS_V1_0) {
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ssl_opt_flags |= SSL_OP_NO_TLSv1;
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}
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if (sock->DisableSslVersions & SSL_VERSION_TLS_V1_1) {
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ssl_opt_flags |= SSL_OP_NO_TLSv1_1;
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}
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if (sock->DisableSslVersions & SSL_VERSION_TLS_V1_2) {
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ssl_opt_flags |= SSL_OP_NO_TLSv1_2;
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}
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SSL_CTX_set_options(ssl_ctx, ssl_opt_flags);
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Unlock(openssl_lock);
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AddChainSslCertOnDirectory(ssl_ctx);
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Lock(openssl_lock);
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@ -313,6 +313,7 @@ struct SOCK
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UINT Reverse_MyServerPort; // Self port number when using the reverse socket
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UCHAR Ssl_Init_Async_SendAlert[2]; // Initial state of SSL send_alert
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bool AcceptOnlyTls; // Accept only TLS (disable SSLv3)
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UINT DisableSslVersions; // Bitmap of SSL Version to disable
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bool RawIP_HeaderIncludeFlag;
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#ifdef ENABLE_SSL_LOGGING
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