GnutTLS: TLS 1.3 support

Closes #2971

1 files changed, 62 insertions, 9 deletions

diff --git a/lib/vtls/gtls.c b/lib/vtls/gtls.c
index 93f5ed1db..8b8b64bde 100644
--- a/lib/vtls/gtls.c
+++ b/lib/vtls/gtls.c
@@ -94,6 +94,10 @@ static bool gtls_inited = FALSE;
 #  endif
 #endif
 
+#if (GNUTLS_VERSION_NUMBER >= 0x030603)
+#define HAS_TLS13
+#endif
+
 #ifdef HAS_OCSP
 # include <gnutls/ocsp.h>
 #endif
@@ -391,6 +395,9 @@ set_ssl_version_min_max(int *list, size_t list_size, struct connectdata *conn)
   switch(ssl_version_max) {
     case CURL_SSLVERSION_MAX_NONE:
     case CURL_SSLVERSION_MAX_DEFAULT:
+#ifdef HAS_TLS13
+      ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_3;
+#endif
       ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
       break;
   }
@@ -408,8 +415,13 @@ set_ssl_version_min_max(int *list, size_t list_size, struct connectdata *conn)
         protocol_priority[protocol_priority_idx++] = GNUTLS_TLS1_2;
         break;
       case CURL_SSLVERSION_TLSv1_3:
+#ifdef HAS_TLS13
+        protocol_priority[protocol_priority_idx++] = GNUTLS_TLS1_3;
+        break;
+#else
         failf(data, "GnuTLS: TLS 1.3 is not yet supported");
         return CURLE_SSL_CONNECT_ERROR;
+#endif
     }
   }
   return CURLE_OK;
@@ -427,11 +439,7 @@ set_ssl_version_min_max(const char **prioritylist, struct connectdata *conn)
   struct Curl_easy *data = conn->data;
   long ssl_version = SSL_CONN_CONFIG(version);
   long ssl_version_max = SSL_CONN_CONFIG(version_max);
-  if(ssl_version == CURL_SSLVERSION_TLSv1_3 ||
-     ssl_version_max == CURL_SSLVERSION_MAX_TLSv1_3) {
-    failf(data, "GnuTLS: TLS 1.3 is not yet supported");
-    return CURLE_SSL_CONNECT_ERROR;
-  }
+
   if(ssl_version_max == CURL_SSLVERSION_MAX_NONE) {
     ssl_version_max = CURL_SSLVERSION_MAX_DEFAULT;
   }
@@ -445,7 +453,6 @@ set_ssl_version_min_max(const char **prioritylist, struct connectdata *conn)
                       "+VERS-TLS1.0:+VERS-TLS1.1:" GNUTLS_SRP;
       return CURLE_OK;
     case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_TLSv1_2:
-    case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_DEFAULT:
       *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
                       "+VERS-TLS1.0:+VERS-TLS1.1:+VERS-TLS1.2:" GNUTLS_SRP;
       return CURLE_OK;
@@ -454,15 +461,54 @@ set_ssl_version_min_max(const char **prioritylist, struct connectdata *conn)
                       "+VERS-TLS1.1:" GNUTLS_SRP;
       return CURLE_OK;
     case CURL_SSLVERSION_TLSv1_1 | CURL_SSLVERSION_MAX_TLSv1_2:
-    case CURL_SSLVERSION_TLSv1_1 | CURL_SSLVERSION_MAX_DEFAULT:
       *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
                       "+VERS-TLS1.1:+VERS-TLS1.2:" GNUTLS_SRP;
       return CURLE_OK;
     case CURL_SSLVERSION_TLSv1_2 | CURL_SSLVERSION_MAX_TLSv1_2:
-    case CURL_SSLVERSION_TLSv1_2 | CURL_SSLVERSION_MAX_DEFAULT:
       *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
                       "+VERS-TLS1.2:" GNUTLS_SRP;
       return CURLE_OK;
+    case CURL_SSLVERSION_TLSv1_3 | CURL_SSLVERSION_MAX_TLSv1_3:
+#ifdef HAS_TLS13
+       *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
+                       "+VERS-TLS1.3:" GNUTLS_SRP;
+      return CURLE_OK;
+#else
+       failf(data, "GnuTLS: TLS 1.3 is not yet supported");
+      return CURLE_SSL_CONNECT_ERROR;
+#endif
+    case CURL_SSLVERSION_TLSv1_0 | CURL_SSLVERSION_MAX_DEFAULT:
+      *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
+                      "+VERS-TLS1.0:+VERS-TLS1.1:+VERS-TLS1.2:"
+#ifdef HAS_TLS13
+                      "+VERS-TLS1.3:"
+#endif
+                      GNUTLS_SRP;
+      return CURLE_OK;
+    case CURL_SSLVERSION_TLSv1_1 | CURL_SSLVERSION_MAX_DEFAULT:
+      *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
+                      "+VERS-TLS1.1:+VERS-TLS1.2:"
+#ifdef HAS_TLS13
+                      "+VERS-TLS1.3:"
+#endif
+                      GNUTLS_SRP;
+      return CURLE_OK;
+    case CURL_SSLVERSION_TLSv1_2 | CURL_SSLVERSION_MAX_DEFAULT:
+      *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
+                      "+VERS-TLS1.2:"
+#ifdef HAS_TLS13
+                      "+VERS-TLS1.3:"
+#endif
+                      GNUTLS_SRP;
+      return CURLE_OK;
+    case CURL_SSLVERSION_TLSv1_3 | CURL_SSLVERSION_MAX_DEFAULT:
+      *prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
+                      "+VERS-TLS1.2:"
+#ifdef HAS_TLS13
+                      "+VERS-TLS1.3:"
+#endif
+                      GNUTLS_SRP;
+      return CURLE_OK;
   }
 
   failf(data, "GnuTLS: cannot set ssl protocol");
@@ -675,6 +721,9 @@ gtls_connect_step1(struct connectdata *conn,
       protocol_priority[0] = GNUTLS_TLS1_0;
       protocol_priority[1] = GNUTLS_TLS1_1;
       protocol_priority[2] = GNUTLS_TLS1_2;
+#ifdef HAS_TLS13
+      protocol_priority[3] = GNUTLS_TLS1_3;
+#endif
       break;
     case CURL_SSLVERSION_TLSv1_0:
     case CURL_SSLVERSION_TLSv1_1:
@@ -711,7 +760,11 @@ gtls_connect_step1(struct connectdata *conn,
       break;
     case CURL_SSLVERSION_DEFAULT:
     case CURL_SSLVERSION_TLSv1:
-      prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:" GNUTLS_SRP;
+      prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:"
+#ifdef HAS_TLS13
+                     "+VERS-TLS1.3:"
+#endif
+                     GNUTLS_SRP;
       break;
     case CURL_SSLVERSION_TLSv1_0:
     case CURL_SSLVERSION_TLSv1_1: