traefik/pkg/tls/certificate.go

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package tls
import (
"crypto/tls"
"crypto/x509"
"fmt"
"io/ioutil"
"os"
"sort"
"strings"
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"github.com/containous/traefik/v2/pkg/log"
"github.com/containous/traefik/v2/pkg/tls/generate"
)
var (
// MinVersion Map of allowed TLS minimum versions
MinVersion = map[string]uint16{
`VersionTLS10`: tls.VersionTLS10,
`VersionTLS11`: tls.VersionTLS11,
`VersionTLS12`: tls.VersionTLS12,
`VersionTLS13`: tls.VersionTLS13,
}
// 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,
"TLS_AES_128_GCM_SHA256": tls.TLS_AES_128_GCM_SHA256,
"TLS_AES_256_GCM_SHA384": tls.TLS_AES_256_GCM_SHA384,
"TLS_CHACHA20_POLY1305_SHA256": tls.TLS_CHACHA20_POLY1305_SHA256,
"TLS_FALLBACK_SCSV": tls.TLS_FALLBACK_SCSV,
}
)
// Certificate holds a SSL cert/key pair
// Certs and Key could be either a file path, or the file content itself
type Certificate struct {
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CertFile FileOrContent `json:"certFile,omitempty" toml:"certFile,omitempty" yaml:"certFile,omitempty"`
KeyFile FileOrContent `json:"keyFile,omitempty" toml:"keyFile,omitempty" yaml:"keyFile,omitempty"`
}
// 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
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func (c *Certificates) CreateTLSConfig(entryPointName string) (*tls.Config, error) {
config := &tls.Config{}
domainsCertificates := make(map[string]map[string]*tls.Certificate)
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if c.isEmpty() {
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config.Certificates = []tls.Certificate{}
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cert, err := generate.DefaultCertificate()
if err != nil {
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return nil, err
}
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config.Certificates = append(config.Certificates, *cert)
} else {
for _, certificate := range *c {
err := certificate.AppendCertificate(domainsCertificates, entryPointName)
if err != nil {
log.Errorf("Unable to add a certificate to the entryPoint %q : %v", entryPointName, err)
continue
}
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for _, certDom := range domainsCertificates {
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for _, cert := range certDom {
config.Certificates = append(config.Certificates, *cert)
}
}
}
}
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return config, 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)
}
// AppendCertificate appends a Certificate to a certificates map keyed by entrypoint.
func (c *Certificate) AppendCertificate(certs map[string]map[string]*tls.Certificate, 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 {
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return fmt.Errorf("unable 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])
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var SANs []string
if parsedCert.Subject.CommonName != "" {
SANs = append(SANs, strings.ToLower(parsedCert.Subject.CommonName))
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}
if parsedCert.DNSNames != nil {
sort.Strings(parsedCert.DNSNames)
for _, dnsName := range parsedCert.DNSNames {
if dnsName != parsedCert.Subject.CommonName {
SANs = append(SANs, strings.ToLower(dnsName))
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}
}
}
if parsedCert.IPAddresses != nil {
for _, ip := range parsedCert.IPAddresses {
if ip.String() != parsedCert.Subject.CommonName {
SANs = append(SANs, strings.ToLower(ip.String()))
}
}
}
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certKey := strings.Join(SANs, ",")
certExists := false
if certs[ep] == nil {
certs[ep] = make(map[string]*tls.Certificate)
} else {
for domains := range certs[ep] {
if domains == certKey {
certExists = true
break
}
}
}
if certExists {
log.Warnf("Skipping addition of certificate for domain(s) %q, to EntryPoint %s, as it already exists for this Entrypoint.", certKey, ep)
} else {
log.Debugf("Adding certificate for domain(s) %s", certKey)
certs[ep][certKey] = &tlsCert
}
return err
}
// GetTruncatedCertificateName truncates the certificate name
func (c *Certificate) GetTruncatedCertificateName() string {
certName := c.CertFile.String()
// Truncate certificate information only if it's a well formed certificate content with more than 50 characters
if !c.CertFile.IsPath() && strings.HasPrefix(certName, certificateHeader) && len(certName) > len(certificateHeader)+50 {
certName = strings.TrimPrefix(c.CertFile.String(), certificateHeader)[:50]
}
return certName
}
// 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"
}