AdGuardHome/internal/aghtls/aghtls.go

47 lines
1.2 KiB
Go

// Package aghtls contains utilities for work with TLS.
package aghtls
import (
"crypto/tls"
"github.com/AdguardTeam/golibs/log"
"golang.org/x/exp/slices"
)
// SaferCipherSuites returns a set of default cipher suites with vulnerable and
// weak cipher suites removed.
func SaferCipherSuites() (safe []uint16) {
for _, s := range tls.CipherSuites() {
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
}
func UserPreferedCipherSuites(ciphers []string) (userCiphers []uint16) {
for _, s := range tls.CipherSuites() {
if slices.Contains(ciphers, s.Name) {
userCiphers = append(userCiphers, s.ID)
log.Debug("user specified cipher : %s, ID : %d", s.Name, s.ID)
}
}
return userCiphers
}