74 lines
2.8 KiB
Go
74 lines
2.8 KiB
Go
// Copyright 2021-2022 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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//go:build !fips_strict
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// +build !fips_strict
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package ptls
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import (
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"crypto/tls"
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"crypto/x509"
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)
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func Default(rootCAs *x509.CertPool) *tls.Config {
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return &tls.Config{
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// Can't use SSLv3 because of POODLE and BEAST
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// Can't use TLSv1.0 because of POODLE and BEAST using CBC cipher
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// Can't use TLSv1.1 because of RC4 cipher usage
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//
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// The Kubernetes API Server must use TLS 1.2, at a minimum,
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// to protect the confidentiality of sensitive data during electronic dissemination.
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// https://stigviewer.com/stig/kubernetes/2021-06-17/finding/V-242378
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MinVersion: tls.VersionTLS12,
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// the order does not matter in go 1.17+ https://go.dev/blog/tls-cipher-suites
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// we match crypto/tls.cipherSuitesPreferenceOrder because it makes unit tests easier to write
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// this list is ignored when TLS 1.3 is used
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//
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// as of 2021-10-19, Mozilla Guideline v5.6, Go 1.17.2, intermediate configuration, supports:
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// - Firefox 27
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// - Android 4.4.2
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// - Chrome 31
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// - Edge
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// - IE 11 on Windows 7
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// - Java 8u31
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// - OpenSSL 1.0.1
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// - Opera 20
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// - Safari 9
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// https://ssl-config.mozilla.org/#server=go&version=1.17.2&config=intermediate&guideline=5.6
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//
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// The Kubernetes API server must use approved cipher suites.
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// https://stigviewer.com/stig/kubernetes/2021-06-17/finding/V-242418
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CipherSuites: []uint16{
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// these are all AEADs with ECDHE, some use ChaCha20Poly1305 while others use AES-GCM
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// this provides forward secrecy, confidentiality and authenticity of data
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
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tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
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tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
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},
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// enable HTTP2 for go's 1.7 HTTP Server
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// setting this explicitly is only required in very specific circumstances
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// it is simpler to just set it here than to try and determine if we need to
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NextProtos: []string{"h2", "http/1.1"},
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// optional root CAs, nil means use the host's root CA set
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RootCAs: rootCAs,
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}
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}
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func DefaultLDAP(rootCAs *x509.CertPool) *tls.Config {
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c := Default(rootCAs)
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// add less secure ciphers to support the default AWS Active Directory config
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c.CipherSuites = append(c.CipherSuites,
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// CBC with ECDHE
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// this provides forward secrecy and confidentiality of data but not authenticity
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// MAC-then-Encrypt CBC ciphers are susceptible to padding oracle attacks
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// See https://crypto.stackexchange.com/a/205 and https://crypto.stackexchange.com/a/224
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
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tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
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)
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return c
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}
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