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Pull request: all: imp tls cipher selection

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Closes #2993.

Squashed commit of the following:

commit 6c521e56de024bf92ab7489ed2289da6bce1f3dc
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Jan 25 21:39:48 2022 +0300

    all: imp tls cipher selection
This commit is contained in:
Ainar Garipov 2022-01-26 14:39:34 +03:00
parent 90c17c79de
commit 504c54ab0e
7 changed files with 52 additions and 62 deletions
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6
CHANGELOG.md
View File

@ -60,7 +60,13 @@ In this release, the schema version has changed from 12 to 13.
- Go 1.16 support.
### Security
- Weaker cipher suites that use the CBC (cipher block chaining) mode of
operation have been disabled (#2993).
[#1730]: https://github.com/AdguardTeam/AdGuardHome/issues/1730
[#2993]: https://github.com/AdguardTeam/AdGuardHome/issues/2993
[#3057]: https://github.com/AdguardTeam/AdGuardHome/issues/3057
[#3367]: https://github.com/AdguardTeam/AdGuardHome/issues/3367

31
internal/aghtls/aghtls.go Normal file
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@ -0,0 +1,31 @@
// Package aghtls contains utilities for work with TLS.
package aghtls
import "crypto/tls"
// SaferCipherSuites returns a set of default cipher suites with vulnerable and
// weak cipher suites removed.
func SaferCipherSuites() (safe []uint16) {
suites := tls.CipherSuites()
for _, s := range suites {
switch s.ID {
case
tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
tls.TLS_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_RSA_WITH_AES_128_CBC_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256:
// Less safe 3DES and CBC suites, go on.
default:
safe = append(safe, s.ID)
}
}
return safe
}

2
internal/dnsforward/config.go
View File

@ -11,6 +11,7 @@ import (
"strings"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/aghtls"
"github.com/AdguardTeam/AdGuardHome/internal/filtering"
"github.com/AdguardTeam/dnsproxy/proxy"
"github.com/AdguardTeam/dnsproxy/upstream"
@ -426,6 +427,7 @@ func (s *Server) prepareTLS(proxyConfig *proxy.Config) error {
proxyConfig.TLSConfig = &tls.Config{
GetCertificate: s.onGetCertificate,
CipherSuites: aghtls.SaferCipherSuites(),
MinVersion: tls.VersionTLS12,
}

1
internal/home/dns.go
View File

@ -211,7 +211,6 @@ func generateServerConfig() (newConf dnsforward.ServerConfig, err error) {
}
newConf.TLSv12Roots = Context.tlsRoots
newConf.TLSCiphers = Context.tlsCiphers
newConf.TLSAllowUnencryptedDoH = tlsConf.AllowUnencryptedDoH
newConf.FilterHandler = applyAdditionalFiltering

10
internal/home/home.go
View File

@ -22,6 +22,7 @@ import (
"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/AdGuardHome/internal/aghtls"
"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"
"github.com/AdguardTeam/AdGuardHome/internal/dnsforward"
"github.com/AdguardTeam/AdGuardHome/internal/filtering"
@ -80,7 +81,6 @@ type homeContext struct {
disableUpdate bool // If set, don't check for updates
controlLock sync.Mutex
tlsRoots *x509.CertPool // list of root CAs for TLSv1.2
tlsCiphers []uint16 // list of TLS ciphers to use
transport *http.Transport
client *http.Client
appSignalChannel chan os.Signal // Channel for receiving OS signals by the console app
@ -145,13 +145,13 @@ func setupContext(args options) {
initConfig()
Context.tlsRoots = LoadSystemRootCAs()
Context.tlsCiphers = InitTLSCiphers()
Context.transport = &http.Transport{
DialContext: customDialContext,
Proxy: getHTTPProxy,
TLSClientConfig: &tls.Config{
RootCAs: Context.tlsRoots,
MinVersion: tls.VersionTLS12,
RootCAs: Context.tlsRoots,
CipherSuites: aghtls.SaferCipherSuites(),
MinVersion: tls.VersionTLS12,
},
}
Context.client = &http.Client{
@ -182,7 +182,7 @@ func setupContext(args options) {
// logIfUnsupported logs a formatted warning if the error is one of the
// unsupported errors and returns nil. If err is nil, logIfUnsupported returns
// nil. Otherise, it returns err.
// nil. Otherwise, it returns err.
func logIfUnsupported(msg string, err error) (outErr error) {
if errors.As(err, new(*aghos.UnsupportedError)) {
log.Debug(msg, err)

50
internal/home/tls.go
View File

@ -26,7 +26,6 @@ import (
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
"github.com/google/go-cmp/cmp"
"golang.org/x/sys/cpu"
)
var tlsWebHandlersRegistered = false
@ -731,52 +730,3 @@ func LoadSystemRootCAs() (roots *x509.CertPool) {
return nil
}
// InitTLSCiphers performs the same work as initDefaultCipherSuites() from
// crypto/tls/common.go but don't uses lots of other default ciphers.
func InitTLSCiphers() (ciphers []uint16) {
// Check the cpu flags for each platform that has optimized GCM
// implementations. The worst case is when all these variables are
// false.
var (
hasGCMAsmAMD64 = cpu.X86.HasAES && cpu.X86.HasPCLMULQDQ
hasGCMAsmARM64 = cpu.ARM64.HasAES && cpu.ARM64.HasPMULL
// Keep in sync with crypto/aes/cipher_s390x.go.
hasGCMAsmS390X = cpu.S390X.HasAES &&
cpu.S390X.HasAESCBC &&
cpu.S390X.HasAESCTR &&
(cpu.S390X.HasGHASH || cpu.S390X.HasAESGCM)
hasGCMAsm = hasGCMAsmAMD64 || hasGCMAsmARM64 || hasGCMAsmS390X
)
if hasGCMAsm {
// If AES-GCM hardware is provided then prioritize AES-GCM
// cipher suites.
ciphers = []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
}
} else {
// Without AES-GCM hardware, we put the ChaCha20-Poly1305 cipher
// suites first.
ciphers = []uint16{
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
}
}
return append(
ciphers,
tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
)
}

14
internal/home/web.go
View File

@ -10,6 +10,7 @@ import (
"time"
"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
"github.com/AdguardTeam/AdGuardHome/internal/aghtls"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/netutil"
@ -34,14 +35,13 @@ const (
)
type webConfig struct {
clientFS fs.FS
clientBetaFS fs.FS
BindHost net.IP
BindPort int
BetaBindPort int
PortHTTPS int
firstRun bool
clientFS fs.FS
clientBetaFS fs.FS
// ReadTimeout is an option to pass to http.Server for setting an
// appropriate field.
@ -54,6 +54,8 @@ type webConfig struct {
// WriteTimeout is an option to pass to http.Server for setting an
// appropriate field.
WriteTimeout time.Duration
firstRun bool
}
// HTTPSServer - HTTPS Server
@ -263,9 +265,9 @@ func (web *Web) tlsServerLoop() {
Addr: address,
TLSConfig: &tls.Config{
Certificates: []tls.Certificate{web.httpsServer.cert},
MinVersion: tls.VersionTLS12,
RootCAs: Context.tlsRoots,
CipherSuites: Context.tlsCiphers,
CipherSuites: aghtls.SaferCipherSuites(),
MinVersion: tls.VersionTLS12,
},
Handler: withMiddlewares(Context.mux, limitRequestBody),
ReadTimeout: web.conf.ReadTimeout,