remove support for FIPS 140-2 with boringcrypto (#21292)

This commit removes FIPS 140-2 related code for the following
reasons:
 - FIPS 140-2 is a compliance, not a security requirement. Being
   FIPS 140-2 compliant has no security implication on its own.
   From a tech. perspetive, a FIPS 140-2 compliant implementation
   is not necessarily secure and a non-FIPS 140-2 compliant implementation
   is not necessarily insecure. It depends on the concret design and
   crypto primitives/constructions used.
 - The boringcrypto branch used to achieve FIPS 140-2 compliance was never
   officially supported by the Go team and is now in maintainance mode.
   It is replaced by a built-in FIPS 140-3 module. It will be removed
   eventually. Ref: https://github.com/golang/go/issues/69536
 - FIPS 140-2 modules are no longer re-certified after Sep. 2026.
   Ref: https://csrc.nist.gov/projects/cryptographic-module-validation-program

Signed-off-by: Andreas Auernhammer <github@aead.dev>

internal/config/crypto.go

@@ -27,7 +27,6 @@ import (
 	"io"
 
 	jsoniter "github.com/json-iterator/go"
-	"github.com/minio/minio/internal/fips"
 	"github.com/minio/minio/internal/kms"
 	"github.com/secure-io/sio-go"
 	"github.com/secure-io/sio-go/sioutil"
@@ -64,7 +63,7 @@ func DecryptBytes(k *kms.KMS, ciphertext []byte, context kms.Context) ([]byte, e
 // ciphertext.
 func Encrypt(k *kms.KMS, plaintext io.Reader, ctx kms.Context) (io.Reader, error) {
 	algorithm := sio.AES_256_GCM
-	if !fips.Enabled && !sioutil.NativeAES() {
+	if !sioutil.NativeAES() {
 		algorithm = sio.ChaCha20Poly1305
 	}
 
@@ -145,9 +144,6 @@ func Decrypt(k *kms.KMS, ciphertext io.Reader, associatedData kms.Context) (io.R
 	if err := json.Unmarshal(metadataBuffer, &metadata); err != nil {
 		return nil, err
 	}
-	if fips.Enabled && metadata.Algorithm != sio.AES_256_GCM {
-		return nil, fmt.Errorf("config: unsupported encryption algorithm: %q is not supported in FIPS mode", metadata.Algorithm)
-	}
 
 	key, err := k.Decrypt(context.TODO(), &kms.DecryptRequest{
 		Name:           metadata.KeyID,

internal/config/etcd/etcd.go

@@ -24,7 +24,7 @@ import (
 	"time"
 
 	"github.com/minio/minio/internal/config"
-	"github.com/minio/minio/internal/fips"
+	"github.com/minio/minio/internal/crypto"
 	"github.com/minio/pkg/v3/env"
 	xnet "github.com/minio/pkg/v3/net"
 	clientv3 "go.etcd.io/etcd/client/v3"
@@ -165,8 +165,8 @@ func LookupConfig(kvs config.KVS, rootCAs *x509.CertPool) (Config, error) {
 			MinVersion:               tls.VersionTLS12,
 			NextProtos:               []string{"http/1.1", "h2"},
 			ClientSessionCache:       tls.NewLRUClientSessionCache(64),
-			CipherSuites:             fips.TLSCiphersBackwardCompatible(),
-			CurvePreferences:         fips.TLSCurveIDs(),
+			CipherSuites:             crypto.TLSCiphersBackwardCompatible(),
+			CurvePreferences:         crypto.TLSCurveIDs(),
 		}
 		// This is only to support client side certificate authentication
 		// https://coreos.com/etcd/docs/latest/op-guide/security.html

internal/config/identity/ldap/config.go

@@ -26,7 +26,7 @@ import (
 
 	"github.com/minio/madmin-go/v3"
 	"github.com/minio/minio/internal/config"
-	"github.com/minio/minio/internal/fips"
+	"github.com/minio/minio/internal/crypto"
 	"github.com/minio/pkg/v3/ldap"
 )
 
@@ -197,7 +197,7 @@ func Lookup(s config.Config, rootCAs *x509.CertPool) (l Config, err error) {
 			MinVersion:         tls.VersionTLS12,
 			NextProtos:         []string{"h2", "http/1.1"},
 			ClientSessionCache: tls.NewLRUClientSessionCache(100),
-			CipherSuites:       fips.TLSCiphersBackwardCompatible(), // Contains RSA key exchange
+			CipherSuites:       crypto.TLSCiphersBackwardCompatible(), // Contains RSA key exchange
 			RootCAs:            rootCAs,
 		},
 	}

internal/config/identity/openid/ecdsa-sha3_contrib.go

@@ -11,9 +11,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !fips
-// +build !fips
-
 package openid
 
 import (
@@ -22,7 +19,7 @@ import (
 	"github.com/golang-jwt/jwt/v4"
 
 	// Needed for SHA3 to work - See: https://golang.org/src/crypto/crypto.go?s=1034:1288
-	_ "golang.org/x/crypto/sha3" // There is no SHA-3 FIPS-140 2 compliant implementation
+	_ "golang.org/x/crypto/sha3"
 )
 
 // Specific instances for EC256 and company

internal/config/identity/openid/rsa-sha3_contrib.go

@@ -12,9 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !fips
-// +build !fips
-
 package openid
 
 import (
@@ -23,7 +20,7 @@ import (
 	"github.com/golang-jwt/jwt/v4"
 
 	// Needed for SHA3 to work - See: https://golang.org/src/crypto/crypto.go?s=1034:1288
-	_ "golang.org/x/crypto/sha3" // There is no SHA-3 FIPS-140 2 compliant implementation
+	_ "golang.org/x/crypto/sha3"
 )
 
 // Specific instances for RS256 and company

internal/crypto/crypto.go

@@ -15,22 +15,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-// Package fips provides functionality to configure cryptographic
-// implementations compliant with FIPS 140.
-//
-// FIPS 140 [1] is a US standard for data processing that specifies
-// requirements for cryptographic modules. Software that is "FIPS 140
-// compliant" must use approved cryptographic primitives only and that
-// are implemented by a FIPS 140 certified cryptographic module.
-//
-// So, FIPS 140 requires that a certified implementation of e.g. AES
-// is used to implement more high-level cryptographic protocols.
-// It does not require any specific security criteria for those
-// high-level protocols. FIPS 140 focuses only on the implementation
-// and usage of the most low-level cryptographic building blocks.
-//
-// [1]: https://en.wikipedia.org/wiki/FIPS_140
-package fips
+package crypto
 
 import (
 	"crypto/tls"
@@ -38,40 +23,13 @@ import (
 	"github.com/minio/sio"
 )
 
-// Enabled indicates whether cryptographic primitives,
-// like AES or SHA-256, are implemented using a FIPS 140
-// certified module.
-//
-// If FIPS-140 is enabled no non-NIST/FIPS approved
-// primitives must be used.
-const Enabled = enabled
-
 // DARECiphers returns a list of supported cipher suites
 // for the DARE object encryption.
-func DARECiphers() []byte {
-	if Enabled {
-		return []byte{sio.AES_256_GCM}
-	}
-	return []byte{sio.AES_256_GCM, sio.CHACHA20_POLY1305}
-}
+func DARECiphers() []byte { return []byte{sio.AES_256_GCM, sio.CHACHA20_POLY1305} }
 
 // TLSCiphers returns a list of supported TLS transport
 // cipher suite IDs.
-//
-// The list contains only ciphers that use AES-GCM or
-// (non-FIPS) CHACHA20-POLY1305 and ellitpic curve key
-// exchange.
 func TLSCiphers() []uint16 {
-	if Enabled {
-		return []uint16{
-			tls.TLS_AES_128_GCM_SHA256, // TLS 1.3
-			tls.TLS_AES_256_GCM_SHA384,
-			tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, // TLS 1.2
-			tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
-			tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
-			tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
-		}
-	}
 	return []uint16{
 		tls.TLS_CHACHA20_POLY1305_SHA256, // TLS 1.3
 		tls.TLS_AES_128_GCM_SHA256,
@@ -92,24 +50,6 @@ func TLSCiphers() []uint16 {
 // ciphers for backward compatibility. In particular, AES-CBC
 // and non-ECDHE ciphers.
 func TLSCiphersBackwardCompatible() []uint16 {
-	if Enabled {
-		return []uint16{
-			tls.TLS_AES_128_GCM_SHA256, // TLS 1.3
-			tls.TLS_AES_256_GCM_SHA384,
-			tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, // TLS 1.2 ECDHE GCM
-			tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
-			tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
-			tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
-			tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, // TLS 1.2 ECDHE CBC
-			tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
-			tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
-			tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
-			tls.TLS_RSA_WITH_AES_128_GCM_SHA256, // TLS 1.2 non-ECDHE
-			tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
-			tls.TLS_RSA_WITH_AES_128_CBC_SHA,
-			tls.TLS_RSA_WITH_AES_256_CBC_SHA,
-		}
-	}
 	return []uint16{
 		tls.TLS_CHACHA20_POLY1305_SHA256, // TLS 1.3
 		tls.TLS_AES_128_GCM_SHA256,
@@ -134,10 +74,5 @@ func TLSCiphersBackwardCompatible() []uint16 {
 // TLSCurveIDs returns a list of supported elliptic curve IDs
 // in preference order.
 func TLSCurveIDs() []tls.CurveID {
-	var curves []tls.CurveID
-	if !Enabled {
-		curves = append(curves, tls.X25519) // Only enable X25519 in non-FIPS mode
-	}
-	curves = append(curves, tls.CurveP256, tls.CurveP384, tls.CurveP521)
-	return curves
+	return []tls.CurveID{tls.CurveP256, tls.X25519, tls.CurveP384, tls.CurveP521}
 }

internal/crypto/key.go

@@ -27,7 +27,6 @@ import (
 	"io"
 	"path"
 
-	"github.com/minio/minio/internal/fips"
 	"github.com/minio/minio/internal/hash/sha256"
 	"github.com/minio/minio/internal/logger"
 	"github.com/minio/sio"
@@ -98,7 +97,7 @@ func (key ObjectKey) Seal(extKey []byte, iv [32]byte, domain, bucket, object str
 	mac.Write([]byte(SealAlgorithm))
 	mac.Write([]byte(path.Join(bucket, object))) // use path.Join for canonical 'bucket/object'
 	mac.Sum(sealingKey[:0])
-	if n, err := sio.Encrypt(&encryptedKey, bytes.NewReader(key[:]), sio.Config{Key: sealingKey[:], CipherSuites: fips.DARECiphers()}); n != 64 || err != nil {
+	if n, err := sio.Encrypt(&encryptedKey, bytes.NewReader(key[:]), sio.Config{Key: sealingKey[:]}); n != 64 || err != nil {
 		logger.CriticalIf(context.Background(), errors.New("Unable to generate sealed key"))
 	}
 	sealedKey := SealedKey{
@@ -123,12 +122,12 @@ func (key *ObjectKey) Unseal(extKey []byte, sealedKey SealedKey, domain, bucket,
 		mac.Write([]byte(domain))
 		mac.Write([]byte(SealAlgorithm))
 		mac.Write([]byte(path.Join(bucket, object))) // use path.Join for canonical 'bucket/object'
-		unsealConfig = sio.Config{MinVersion: sio.Version20, Key: mac.Sum(nil), CipherSuites: fips.DARECiphers()}
+		unsealConfig = sio.Config{MinVersion: sio.Version20, Key: mac.Sum(nil)}
 	case InsecureSealAlgorithm:
 		sha := sha256.New()
 		sha.Write(extKey)
 		sha.Write(sealedKey.IV[:])
-		unsealConfig = sio.Config{MinVersion: sio.Version10, Key: sha.Sum(nil), CipherSuites: fips.DARECiphers()}
+		unsealConfig = sio.Config{MinVersion: sio.Version10, Key: sha.Sum(nil)}
 	}
 
 	if out, err := sio.DecryptBuffer(key[:0], sealedKey.Key[:], unsealConfig); len(out) != 32 || err != nil {
@@ -159,7 +158,7 @@ func (key ObjectKey) SealETag(etag []byte) []byte {
 	var buffer bytes.Buffer
 	mac := hmac.New(sha256.New, key[:])
 	mac.Write([]byte("SSE-etag"))
-	if _, err := sio.Encrypt(&buffer, bytes.NewReader(etag), sio.Config{Key: mac.Sum(nil), CipherSuites: fips.DARECiphers()}); err != nil {
+	if _, err := sio.Encrypt(&buffer, bytes.NewReader(etag), sio.Config{Key: mac.Sum(nil)}); err != nil {
 		logger.CriticalIf(context.Background(), errors.New("Unable to encrypt ETag using object key"))
 	}
 	return buffer.Bytes()
@@ -175,5 +174,5 @@ func (key ObjectKey) UnsealETag(etag []byte) ([]byte, error) {
 	}
 	mac := hmac.New(sha256.New, key[:])
 	mac.Write([]byte("SSE-etag"))
-	return sio.DecryptBuffer(make([]byte, 0, len(etag)), etag, sio.Config{Key: mac.Sum(nil), CipherSuites: fips.DARECiphers()})
+	return sio.DecryptBuffer(make([]byte, 0, len(etag)), etag, sio.Config{Key: mac.Sum(nil)})
 }

internal/crypto/sse.go

@@ -24,7 +24,6 @@ import (
 	"io"
 	"net/http"
 
-	"github.com/minio/minio/internal/fips"
 	"github.com/minio/minio/internal/ioutil"
 	"github.com/minio/minio/internal/logger"
 	"github.com/minio/sio"
@@ -101,7 +100,7 @@ func unsealObjectKey(clientKey []byte, metadata map[string]string, bucket, objec
 // EncryptSinglePart encrypts an io.Reader which must be the
 // body of a single-part PUT request.
 func EncryptSinglePart(r io.Reader, key ObjectKey) io.Reader {
-	r, err := sio.EncryptReader(r, sio.Config{MinVersion: sio.Version20, Key: key[:], CipherSuites: fips.DARECiphers()})
+	r, err := sio.EncryptReader(r, sio.Config{MinVersion: sio.Version20, Key: key[:]})
 	if err != nil {
 		logger.CriticalIf(context.Background(), errors.New("Unable to encrypt io.Reader using object key"))
 	}
@@ -123,7 +122,7 @@ func DecryptSinglePart(w io.Writer, offset, length int64, key ObjectKey) io.Writ
 	const PayloadSize = 1 << 16 // DARE 2.0
 	w = ioutil.LimitedWriter(w, offset%PayloadSize, length)
 
-	decWriter, err := sio.DecryptWriter(w, sio.Config{Key: key[:], CipherSuites: fips.DARECiphers()})
+	decWriter, err := sio.DecryptWriter(w, sio.Config{Key: key[:]})
 	if err != nil {
 		logger.CriticalIf(context.Background(), errors.New("Unable to decrypt io.Writer using object key"))
 	}

internal/etag/etag.go

@@ -117,7 +117,6 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/minio/minio/internal/fips"
 	"github.com/minio/minio/internal/hash/sha256"
 	xhttp "github.com/minio/minio/internal/http"
 	"github.com/minio/sio"
@@ -346,8 +345,7 @@ func Decrypt(key []byte, etag ETag) (ETag, error) {
 
 	plaintext := make([]byte, 0, 16)
 	etag, err := sio.DecryptBuffer(plaintext, etag, sio.Config{
-		Key:          decryptionKey,
-		CipherSuites: fips.DARECiphers(),
+		Key: decryptionKey,
 	})
 	if err != nil {
 		return nil, err

internal/fips/fips.go

@@ -1,25 +0,0 @@
-// Copyright (c) 2015-2021 MinIO, Inc.
-//
-// This file is part of MinIO Object Storage stack
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-//go:build fips && linux && amd64
-// +build fips,linux,amd64
-
-package fips
-
-import _ "crypto/tls/fipsonly"
-
-const enabled = true

internal/fips/no_fips.go

@@ -1,23 +0,0 @@
-// Copyright (c) 2015-2021 MinIO, Inc.
-//
-// This file is part of MinIO Object Storage stack
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-//go:build !fips
-// +build !fips
-
-package fips
-
-const enabled = false