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tls_config.go
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tls_config.go
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package tlsconfig
import (
"crypto/tls"
"fmt"
"sort"
"strings"
)
type Config struct {
Ciphers []string `toml:"ciphers"`
MinVersion string `toml:"min-version"`
MaxVersion string `toml:"max-version"`
}
func NewConfig() Config {
return Config{}
}
func (c Config) Validate() error {
_, err := c.Parse()
return err
}
func (c Config) Parse() (out *tls.Config, err error) {
if len(c.Ciphers) > 0 {
if out == nil {
out = new(tls.Config)
}
for _, name := range c.Ciphers {
cipher, ok := ciphersMap[strings.ToUpper(name)]
if !ok {
return nil, unknownCipher(name)
}
out.CipherSuites = append(out.CipherSuites, cipher)
}
}
if c.MinVersion != "" {
if out == nil {
out = new(tls.Config)
}
version, ok := versionsMap[strings.ToUpper(c.MinVersion)]
if !ok {
return nil, unknownVersion(c.MinVersion)
}
out.MinVersion = version
}
if c.MaxVersion != "" {
if out == nil {
out = new(tls.Config)
}
version, ok := versionsMap[strings.ToUpper(c.MaxVersion)]
if !ok {
return nil, unknownVersion(c.MaxVersion)
}
out.MaxVersion = version
}
return out, nil
}
var ciphersMap = map[string]uint16{
"TLS_RSA_WITH_RC4_128_SHA": tls.TLS_RSA_WITH_RC4_128_SHA,
"TLS_RSA_WITH_3DES_EDE_CBC_SHA": tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
"TLS_RSA_WITH_AES_128_CBC_SHA": tls.TLS_RSA_WITH_AES_128_CBC_SHA,
"TLS_RSA_WITH_AES_256_CBC_SHA": tls.TLS_RSA_WITH_AES_256_CBC_SHA,
"TLS_RSA_WITH_AES_128_CBC_SHA256": tls.TLS_RSA_WITH_AES_128_CBC_SHA256,
"TLS_RSA_WITH_AES_128_GCM_SHA256": tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
"TLS_RSA_WITH_AES_256_GCM_SHA384": tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
"TLS_ECDHE_ECDSA_WITH_RC4_128_SHA": tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA": tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA": tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
"TLS_ECDHE_RSA_WITH_RC4_128_SHA": tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA,
"TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA": tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA": tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA": tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256": tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256": tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256": tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256": tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384": tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384": tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305": tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305": tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
}
func unknownCipher(name string) error {
available := make([]string, 0, len(ciphersMap))
for name := range ciphersMap {
available = append(available, name)
}
sort.Strings(available)
return fmt.Errorf("unknown cipher suite: %q. available ciphers: %s",
name, strings.Join(available, ", "))
}
var versionsMap = map[string]uint16{
"SSL3.0": tls.VersionSSL30,
"TLS1.0": tls.VersionTLS10,
"1.0": tls.VersionTLS11,
"TLS1.1": tls.VersionTLS11,
"1.1": tls.VersionTLS11,
"TLS1.2": tls.VersionTLS12,
"1.2": tls.VersionTLS12,
}
func unknownVersion(name string) error {
available := make([]string, 0, len(versionsMap))
for name := range versionsMap {
// skip the ones that just begin with a number. they may be confusing
// due to the duplication, and just help if the user specifies without
// the TLS part.
if name[0] == '1' {
continue
}
available = append(available, name)
}
sort.Strings(available)
return fmt.Errorf("unknown tls version: %q. available versions: %s",
name, strings.Join(available, ", "))
}