Support native Golang "fips140" mode (#1696)

Add support for the "fips140" mode of Go:

- https://go.dev/doc/security/fips140
- https://csrc.nist.gov/projects/cryptographic-module-validation-program/certificate/5247

You can build with `make fips140`, see the README changes for more info.

Some differences from the boringcrypto builds:

- We switch to using `go:linkname crypto/tls.aeadAESGCMTLS13`, which gives us the fips implementation for both `boringcrypto` and `fips140` modes. This means we also no longer need `-checklinkname=0`
- Go native `fips140` doesn't need CGO_ENABLED=1
- We decide if we should use the fips140 GCM at runtime, if `fips140.Enabled()` is true. If you use the `make release-fips140`, we build with build tag `fips140enforce` which ensures the binary is running with fips140 enabled and that only P256 / AES-GCM is being used. If you don't want this enforce mode, you can build without the build tag.

cmd/nebula-cert/ca.go

@@ -3,7 +3,9 @@ package main
 import (
 	"crypto/ecdsa"
 	"crypto/elliptic"
+	"crypto/fips140"
 	"crypto/rand"
+	"errors"
 	"flag"
 	"fmt"
 	"io"
@@ -44,6 +46,13 @@ type caFlags struct {
 	subnets *string
 }
 
+func defaultCurve() string {
+	if fips140.Enforced() {
+		return "P256"
+	}
+	return "25519"
+}
+
 func newCaFlags() *caFlags {
 	// prevent running out of memory on 32-bit systems by defaulting to
 	// RFC9106's recommendation for memory-constrained environments
@@ -74,7 +83,7 @@ func newCaFlags() *caFlags {
 	cf.argonParallelism = cf.set.Uint("argon-parallelism", 4, "Optional: Argon2 parallelism parameter used for encrypted private key passphrase")
 	cf.argonIterations = cf.set.Uint("argon-iterations", defaultArgonIterations, "Optional: Argon2 iterations parameter used for encrypted private key passphrase")
 	cf.encryption = cf.set.Bool("encrypt", false, "Optional: prompt for passphrase and write out-key in an encrypted format")
-	cf.curve = cf.set.String("curve", "25519", "EdDSA/ECDSA Curve (25519, P256)")
+	cf.curve = cf.set.String("curve", defaultCurve(), "EdDSA/ECDSA Curve (25519, P256)")
 	cf.p11url = p11Flag(cf.set)
 
 	cf.ips = cf.set.String("ips", "", "Deprecated, see -networks")
@@ -259,6 +268,9 @@ func ca(args []string, out io.Writer, errOut io.Writer, pr PasswordReader) error
 	} else {
 		switch *cf.curve {
 		case "25519", "X25519", "Curve25519", "CURVE25519":
+			if fips140.Enforced() {
+				return errors.New("use of Curve25519 is not allowed in FIPS 140-only mode")
+			}
 			curve = cert.Curve_CURVE25519
 			pub, rawPriv, err = ed25519.GenerateKey(rand.Reader)
 			if err != nil {

cmd/nebula-cert/fips140enforce.go

@@ -0,0 +1,5 @@
+//go:build fips140enforce
+
+//go:debug fips140=only
+
+package main

cmd/nebula-cert/keygen.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"crypto/fips140"
+	"errors"
 	"flag"
 	"fmt"
 	"io"
@@ -24,7 +26,7 @@ func newKeygenFlags() *keygenFlags {
 	cf.set.Usage = func() {}
 	cf.outPubPath = cf.set.String("out-pub", "", "Required: path to write the public key to")
 	cf.outKeyPath = cf.set.String("out-key", "", "Required: path to write the private key to")
-	cf.curve = cf.set.String("curve", "25519", "ECDH Curve (25519, P256)")
+	cf.curve = cf.set.String("curve", defaultCurve(), "ECDH Curve (25519, P256)")
 	cf.p11url = p11Flag(cf.set)
 	return &cf
 }
@@ -61,6 +63,9 @@ func keygen(args []string, out io.Writer, errOut io.Writer) error {
 	} else {
 		switch *cf.curve {
 		case "25519", "X25519", "Curve25519", "CURVE25519":
+			if fips140.Enforced() {
+				return errors.New("use of Curve25519 is not allowed in FIPS 140-only mode")
+			}
 			pub, rawPriv = x25519Keypair()
 			curve = cert.Curve_CURVE25519
 		case "P256":

cmd/nebula-cert/sign.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"crypto/ecdh"
+	"crypto/fips140"
 	"crypto/rand"
 	"errors"
 	"flag"
@@ -268,6 +269,10 @@ func signCert(args []string, out io.Writer, errOut io.Writer, pr PasswordReader)
 		}(p11Client)
 	}
 
+	if fips140.Enforced() && curve == cert.Curve_CURVE25519 {
+		return errors.New("use of Curve25519 is not allowed in FIPS 140-only mode")
+	}
+
 	if *sf.inPubPath != "" {
 		var pubCurve cert.Curve
 		rawPub, err := readInput("in-pub", *sf.inPubPath, &claims)

cmd/nebula-service/fips140enforce.go

@@ -0,0 +1,5 @@
+//go:build fips140enforce
+
+//go:debug fips140=only
+
+package main

cmd/nebula/fips140enforce.go

@@ -0,0 +1,5 @@
+//go:build fips140enforce
+
+//go:debug fips140=only
+
+package main