add an experiment to prefer TLS 1.3 over secio

License: MIT
Signed-off-by: Marten Seemann <martenseemann@gmail.com>

core/node/libp2p.go

@@ -362,7 +362,11 @@ func P2PSecurity(enabled bool) interface{} {
 		}
 	}
 	return func(cfg *config.Config) (opts Libp2pOpts) {
-		opts.Opts = append(opts.Opts, libp2p.ChainOptions(libp2p.Security(secio.ID, secio.New), libp2p.Security(tls.ID, tls.New)))
+		if cfg.Experimental.PreferTLS {
+			opts.Opts = append(opts.Opts, libp2p.ChainOptions(libp2p.Security(tls.ID, tls.New), libp2p.Security(secio.ID, secio.New)))
+		} else {
+			opts.Opts = append(opts.Opts, libp2p.ChainOptions(libp2p.Security(secio.ID, secio.New), libp2p.Security(tls.ID, tls.New)))
+		}
 		return opts
 	}
 }

docs/experimental-features.md

@@ -683,3 +683,22 @@ ipfs config --json Swarm.EnableAutoNATService true
 ### Road to being a real feature
 
 - [ ] needs testing
+
+
+## TLS 1.3 as default handshake protocol
+
+### State
+
+Every node accepts secio and TLS 1.3 connections, but prefers secio over TLS when dialing.
+
+### How to enable
+
+Modify your ipfs config:
+
+```
+ipfs config --json Experimental.PreferTLS true
+```
+
+### Road to being a real feature
+
+- [ ] needs testing

go.mod

@@ -34,7 +34,7 @@ require (
 	github.com/ipfs/go-ipfs-chunker v0.0.1
 	github.com/ipfs/go-ipfs-cmdkit v0.0.1
 	github.com/ipfs/go-ipfs-cmds v0.0.5
-	github.com/ipfs/go-ipfs-config v0.0.1
+	github.com/ipfs/go-ipfs-config v0.0.2
 	github.com/ipfs/go-ipfs-ds-help v0.0.1
 	github.com/ipfs/go-ipfs-exchange-interface v0.0.1
 	github.com/ipfs/go-ipfs-exchange-offline v0.0.1

go.sum

@@ -160,6 +160,8 @@ github.com/ipfs/go-ipfs-cmds v0.0.5 h1:+blTEnA0MzkQO86WnpfGnchdojrY5wJLhsbby3/JX
 github.com/ipfs/go-ipfs-cmds v0.0.5/go.mod h1:1QVgxSgenZvOMGVC/XUTC7tJxRBGPLxYvpgPpCi3DUk=
 github.com/ipfs/go-ipfs-config v0.0.1 h1:6ED08emzI1imdsAjixFi2pEyZxTVD5ECKtCOxLBx+Uc=
 github.com/ipfs/go-ipfs-config v0.0.1/go.mod h1:KDbHjNyg4e6LLQSQpkgQMBz6Jf4LXiWAcmnkcwmH0DU=
+github.com/ipfs/go-ipfs-config v0.0.2 h1:gmSXTvsuqE6ES1bK9LziWNaEiVkV2Mu/9c50D0haVJY=
+github.com/ipfs/go-ipfs-config v0.0.2/go.mod h1:KDbHjNyg4e6LLQSQpkgQMBz6Jf4LXiWAcmnkcwmH0DU=
 github.com/ipfs/go-ipfs-delay v0.0.0-20181109222059-70721b86a9a8/go.mod h1:8SP1YXK1M1kXuc4KJZINY3TQQ03J2rwBG9QfXmbRPrw=
 github.com/ipfs/go-ipfs-delay v0.0.1 h1:r/UXYyRcddO6thwOnhiznIAiSvxMECGgtv35Xs1IeRQ=
 github.com/ipfs/go-ipfs-delay v0.0.1/go.mod h1:8SP1YXK1M1kXuc4KJZINY3TQQ03J2rwBG9QfXmbRPrw=