72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
// Package aghtls contains utilities for work with TLS.
|
|
package aghtls
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"fmt"
|
|
|
|
"github.com/AdguardTeam/golibs/log"
|
|
)
|
|
|
|
// init makes sure that the cipher name map is filled.
|
|
//
|
|
// TODO(a.garipov): Propose a similar API to crypto/tls.
|
|
func init() {
|
|
suites := tls.CipherSuites()
|
|
cipherSuites = make(map[string]uint16, len(suites))
|
|
for _, s := range suites {
|
|
cipherSuites[s.Name] = s.ID
|
|
}
|
|
|
|
log.Debug("tls: known ciphers: %q", cipherSuites)
|
|
}
|
|
|
|
// cipherSuites are a name-to-ID mapping of cipher suites from crypto/tls. It
|
|
// is filled by init. It must not be modified.
|
|
var cipherSuites map[string]uint16
|
|
|
|
// ParseCiphers parses a slice of cipher suites from cipher names.
|
|
func ParseCiphers(cipherNames []string) (cipherIDs []uint16, err error) {
|
|
if cipherNames == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
cipherIDs = make([]uint16, 0, len(cipherNames))
|
|
for _, name := range cipherNames {
|
|
id, ok := cipherSuites[name]
|
|
if !ok {
|
|
return nil, fmt.Errorf("unknown cipher %q", name)
|
|
}
|
|
|
|
cipherIDs = append(cipherIDs, id)
|
|
}
|
|
|
|
return cipherIDs, nil
|
|
}
|
|
|
|
// 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
|
|
}
|