traefik/tls/certificate.go
2018-02-27 14:10:24 +01:00

218 lines
7 KiB
Go

package tls
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"os"
"sort"
"strings"
"github.com/containous/traefik/log"
"github.com/containous/traefik/tls/generate"
)
var (
// MinVersion Map of allowed TLS minimum versions
MinVersion = map[string]uint16{
`VersionTLS10`: tls.VersionTLS10,
`VersionTLS11`: tls.VersionTLS11,
`VersionTLS12`: tls.VersionTLS12,
}
// CipherSuites Map of TLS CipherSuites from crypto/tls
// Available CipherSuites defined at https://golang.org/pkg/crypto/tls/#pkg-constants
CipherSuites = 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,
}
)
// Certificate holds a SSL cert/key pair
// Certs and Key could be either a file path, or the file content itself
type Certificate struct {
CertFile FileOrContent
KeyFile FileOrContent
}
// Certificates defines traefik certificates type
// Certs and Keys could be either a file path, or the file content itself
type Certificates []Certificate
// FileOrContent hold a file path or content
type FileOrContent string
func (f FileOrContent) String() string {
return string(f)
}
// IsPath returns true if the FileOrContent is a file path, otherwise returns false
func (f FileOrContent) IsPath() bool {
_, err := os.Stat(f.String())
return err == nil
}
func (f FileOrContent) Read() ([]byte, error) {
var content []byte
if _, err := os.Stat(f.String()); err == nil {
content, err = ioutil.ReadFile(f.String())
if err != nil {
return nil, err
}
} else {
content = []byte(f)
}
return content, nil
}
// CreateTLSConfig creates a TLS config from Certificate structures
func (c *Certificates) CreateTLSConfig(entryPointName string) (*tls.Config, map[string]*DomainsCertificates, error) {
config := &tls.Config{}
domainsCertificates := make(map[string]*DomainsCertificates)
if c.isEmpty() {
config.Certificates = make([]tls.Certificate, 0)
cert, err := generate.DefaultCertificate()
if err != nil {
return nil, nil, err
}
config.Certificates = append(config.Certificates, *cert)
} else {
for _, certificate := range *c {
err := certificate.AppendCertificates(domainsCertificates, entryPointName)
if err != nil {
log.Errorf("Unable to add a certificate to the entryPoint %q : %v", entryPointName, err)
continue
}
for _, certDom := range domainsCertificates {
for _, cert := range certDom.Get().(map[string]*tls.Certificate) {
config.Certificates = append(config.Certificates, *cert)
}
}
}
}
return config, domainsCertificates, nil
}
// isEmpty checks if the certificates list is empty
func (c *Certificates) isEmpty() bool {
if len(*c) == 0 {
return true
}
var key int
for _, cert := range *c {
if len(cert.CertFile.String()) != 0 && len(cert.KeyFile.String()) != 0 {
break
}
key++
}
return key == len(*c)
}
// AppendCertificates appends a Certificate to a certificates map sorted by entrypoints
func (c *Certificate) AppendCertificates(certs map[string]*DomainsCertificates, ep string) error {
certContent, err := c.CertFile.Read()
if err != nil {
return fmt.Errorf("unable to read CertFile : %v", err)
}
keyContent, err := c.KeyFile.Read()
if err != nil {
return fmt.Errorf("uUnable to read KeyFile : %v", err)
}
tlsCert, err := tls.X509KeyPair(certContent, keyContent)
if err != nil {
return fmt.Errorf("unable to generate TLS certificate : %v", err)
}
parsedCert, _ := x509.ParseCertificate(tlsCert.Certificate[0])
certKey := parsedCert.Subject.CommonName
if parsedCert.DNSNames != nil {
sort.Strings(parsedCert.DNSNames)
for _, dnsName := range parsedCert.DNSNames {
if dnsName != parsedCert.Subject.CommonName {
certKey += fmt.Sprintf(",%s", dnsName)
}
}
}
certExists := false
if certs[ep] == nil {
certs[ep] = new(DomainsCertificates)
*certs[ep] = make(map[string]*tls.Certificate)
} else {
for domains := range *certs[ep] {
if domains == certKey {
certExists = true
break
}
}
}
if certExists {
log.Warnf("Into EntryPoint %s, try to add certificate for domains which already have this certificate (%s). The new certificate will not be append to the EntryPoint.", ep, certKey)
} else {
log.Debugf("Add certificate for domains %s", certKey)
err = certs[ep].add(certKey, &tlsCert)
}
return err
}
// String is the method to format the flag's value, part of the flag.Value interface.
// The String method's output will be used in diagnostics.
func (c *Certificates) String() string {
if len(*c) == 0 {
return ""
}
var result []string
for _, certificate := range *c {
result = append(result, certificate.CertFile.String()+","+certificate.KeyFile.String())
}
return strings.Join(result, ";")
}
// Set is the method to set the flag value, part of the flag.Value interface.
// Set's argument is a string to be parsed to set the flag.
// It's a comma-separated list, so we split it.
func (c *Certificates) Set(value string) error {
certificates := strings.Split(value, ";")
for _, certificate := range certificates {
files := strings.Split(certificate, ",")
if len(files) != 2 {
return fmt.Errorf("bad certificates format: %s", value)
}
*c = append(*c, Certificate{
CertFile: FileOrContent(files[0]),
KeyFile: FileOrContent(files[1]),
})
}
return nil
}
// Type is type of the struct
func (c *Certificates) Type() string {
return "certificates"
}