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daemon: optionally enforce strong TLS ciphers via environment variable

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Introduce the DOCKER_DISABLE_WEAK_CIPHERS environment variable to allow
disabling weak TLS ciphers. When set to true, the daemon restricts
TLS to a modern, secure subset of cipher suites, disabling known weak
ciphers such as CBC-mode ciphers.

This is intended as an edge-case option and is not exposed via a CLI flag or
config option. By default, weak ciphers remain enabled for backward compatibility.

Signed-off-by: Sopho Merkviladze <smerkviladze@mirantis.com>
This commit is contained in:
Sopho Merkviladze
2025-10-01 13:47:35 +04:00
committed by Sopho Merkviladze
parent b4c0ebf6d4
commit 26d6c35b1b
1 changed files with 22 additions and 0 deletions
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22
cmd/dockerd/daemon.go
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@@ -9,7 +9,9 @@ import (
"os"
"path/filepath"
"runtime"
"slices"
"sort"
"strconv"
"strings"
"sync"
"time"
@@ -67,6 +69,14 @@ import (
"tags.cncf.io/container-device-interface/pkg/cdi"
)
// strongTLSCiphers defines a secure, modern set of TLS cipher suites for use by the daemon.
var strongTLSCiphers = []uint16{
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
}
// DaemonCli represents the daemon CLI.
type DaemonCli struct {
*config.Config
@@ -779,6 +789,18 @@ func newAPIServerTLSConfig(config *config.Config) (*tls.Config, error) {
if err != nil {
return nil, errors.Wrap(err, "invalid TLS configuration")
}
// Optionally enforce strong TLS ciphers via the environment variable DOCKER_DISABLE_WEAK_CIPHERS.
// When set to true, weak TLS ciphers are disabled, restricting the daemon to a modern, secure
// subset of cipher suites.
if disableWeakCiphers := os.Getenv("DOCKER_DISABLE_WEAK_CIPHERS"); disableWeakCiphers != "" {
disable, err := strconv.ParseBool(disableWeakCiphers)
if err != nil {
return nil, errors.Wrap(err, "invalid value for DOCKER_DISABLE_WEAK_CIPHERS")
}
if disable {
tlsConfig.CipherSuites = slices.Clone(strongTLSCiphers)
}
}
}
return tlsConfig, nil