Add insecure option

Add option to not _validate_ if the certificate served from headscale is
trusted.

app.go

@@ -123,6 +123,7 @@ type CLIConfig struct {
 	Address  string
 	APIKey   string
 	Timeout  time.Duration
+	Insecure bool
 }
 
 // Headscale represents the base app of the service.

cmd/headscale/cli/utils.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"context"
+	"crypto/tls"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -60,6 +61,7 @@ func LoadConfig(path string) error {
 	viper.SetDefault("grpc_listen_addr", ":50443")
 
 	viper.SetDefault("cli.timeout", "5s")
+	viper.SetDefault("cli.insecure", false)
 
 	if err := viper.ReadInConfig(); err != nil {
 		return fmt.Errorf("fatal error reading config file: %w", err)
@@ -328,6 +330,7 @@ func getHeadscaleConfig() headscale.Config {
 			Address:  viper.GetString("cli.address"),
 			APIKey:   viper.GetString("cli.api_key"),
 			Timeout:  viper.GetDuration("cli.timeout"),
+			Insecure: viper.GetBool("cli.insecure"),
 		},
 	}
 }
@@ -411,9 +414,23 @@ func getHeadscaleCLIClient() (context.Context, v1.HeadscaleServiceClient, *grpc.
 			grpc.WithPerRPCCredentials(tokenAuth{
 				token: apiKey,
 			}),
+		)
+
+		if cfg.CLI.Insecure {
+			tlsConfig := &tls.Config{
+				InsecureSkipVerify: true,
+			}
+
+			grpcOptions = append(grpcOptions,
+				grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)),
+			)
+
+		} else {
+			grpcOptions = append(grpcOptions,
 				grpc.WithTransportCredentials(credentials.NewClientTLSFromCert(nil, "")),
 			)
 		}
+	}
 
 	log.Trace().Caller().Str("address", address).Msg("Connecting via gRPC")
 	conn, err := grpc.DialContext(ctx, address, grpcOptions...)

docs/remote-cli.md

@@ -5,7 +5,7 @@
 - A workstation to run `headscale` (could be Linux, macOS, other supported platforms)
 - A `headscale` server (version `0.13.0` or newer)
 - Access to create API keys (local access to the `headscale` server)
-- `headscale` _must_ be served over TLS/HTTPS with a _trusted_ certificate
+- `headscale` _must_ be served over TLS/HTTPS
   - Remote access does _not_ support unencrypted traffic.
 - Port `50443` must be open in the firewall (or port overriden by `grpc_listen_addr` option)
 
@@ -89,4 +89,5 @@ Checklist:
 - Make sure you have the _same_ `headscale` version on your server and workstation
 - Make sure you use version `0.13.0` or newer.
 - Verify that your TLS certificate is valid and trusted
-  - If you do not have access to a trusted certificate (e.g. from Let's Encrypt), add your self signed certificate to the trust store of your OS.
+  - If you do not have access to a trusted certificate (e.g. from Let's Encrypt), add your self signed certificate to the trust store of your OS or
+  - Set `HEADSCALE_CLI_INSECURE` to 0 in your environement