traefik/pkg/tls/certificate.go

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package tls
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"net/url"
"os"
"sort"
"strings"
"github.com/traefik/traefik/v2/pkg/log"
)
var (
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// MinVersion Map of allowed TLS minimum versions.
MinVersion = map[string]uint16{
`VersionTLS10`: tls.VersionTLS10,
`VersionTLS11`: tls.VersionTLS11,
`VersionTLS12`: tls.VersionTLS12,
`VersionTLS13`: tls.VersionTLS13,
}
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// MaxVersion Map of allowed TLS maximum versions.
MaxVersion = map[string]uint16{
`VersionTLS10`: tls.VersionTLS10,
`VersionTLS11`: tls.VersionTLS11,
`VersionTLS12`: tls.VersionTLS12,
`VersionTLS13`: tls.VersionTLS13,
}
// CurveIDs is a Map of TLS elliptic curves from crypto/tls
// Available CurveIDs defined at https://godoc.org/crypto/tls#CurveID,
// also allowing rfc names defined at https://tools.ietf.org/html/rfc8446#section-4.2.7
CurveIDs = map[string]tls.CurveID{
`secp256r1`: tls.CurveP256,
`CurveP256`: tls.CurveP256,
`secp384r1`: tls.CurveP384,
`CurveP384`: tls.CurveP384,
`secp521r1`: tls.CurveP521,
`CurveP521`: tls.CurveP521,
`x25519`: tls.X25519,
`X25519`: tls.X25519,
}
)
// Certificate holds a SSL cert/key pair
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// 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" loggable:"false"`
}
// Certificates defines traefik certificates type
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// Certs and Keys could be either a file path, or the file content itself.
type Certificates []Certificate
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// GetCertificates retrieves the certificates as slice of tls.Certificate.
func (c Certificates) GetCertificates() []tls.Certificate {
var certs []tls.Certificate
for _, certificate := range c {
cert, err := certificate.GetCertificate()
if err != nil {
log.WithoutContext().Debugf("Error while getting certificate: %v", err)
continue
}
certs = append(certs, cert)
}
return certs
}
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// FileOrContent hold a file path or content.
type FileOrContent string
func (f FileOrContent) String() string {
return string(f)
}
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// 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 f.IsPath() {
var err error
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content, err = os.ReadFile(f.String())
if err != nil {
return nil, err
}
} else {
content = []byte(f)
}
return content, nil
}
// AppendCertificate appends a Certificate to a certificates map keyed by store name.
func (c *Certificate) AppendCertificate(certs map[string]map[string]*tls.Certificate, storeName string) error {
certContent, err := c.CertFile.Read()
if err != nil {
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return fmt.Errorf("unable to read CertFile : %w", err)
}
keyContent, err := c.KeyFile.Read()
if err != nil {
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return fmt.Errorf("unable to read KeyFile : %w", err)
}
tlsCert, err := tls.X509KeyPair(certContent, keyContent)
if err != nil {
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return fmt.Errorf("unable to generate TLS certificate : %w", 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 {
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()))
}
}
}
// Guarantees the order to produce a unique cert key.
sort.Strings(SANs)
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certKey := strings.Join(SANs, ",")
certExists := false
if certs[storeName] == nil {
certs[storeName] = make(map[string]*tls.Certificate)
} else {
for domains := range certs[storeName] {
if domains == certKey {
certExists = true
break
}
}
}
if certExists {
log.Debugf("Skipping addition of certificate for domain(s) %q, to TLS Store %s, as it already exists for this store.", certKey, storeName)
} else {
log.Debugf("Adding certificate for domain(s) %s", certKey)
certs[storeName][certKey] = &tlsCert
}
return err
}
// GetCertificate returns a tls.Certificate matching the configured CertFile and KeyFile.
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func (c *Certificate) GetCertificate() (tls.Certificate, error) {
certContent, err := c.CertFile.Read()
if err != nil {
return tls.Certificate{}, fmt.Errorf("unable to read CertFile: %w", err)
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}
keyContent, err := c.KeyFile.Read()
if err != nil {
return tls.Certificate{}, fmt.Errorf("unable to read KeyFile: %w", err)
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}
cert, err := tls.X509KeyPair(certContent, keyContent)
if err != nil {
return tls.Certificate{}, fmt.Errorf("unable to parse TLS certificate: %w", err)
}
return cert, nil
}
// GetCertificateFromBytes returns a tls.Certificate matching the configured CertFile and KeyFile.
// It assumes that the configured CertFile and KeyFile are of byte type.
func (c *Certificate) GetCertificateFromBytes() (tls.Certificate, error) {
cert, err := tls.X509KeyPair([]byte(c.CertFile), []byte(c.KeyFile))
if err != nil {
return tls.Certificate{}, fmt.Errorf("unable to parse TLS certificate: %w", err)
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}
return cert, nil
}
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// 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
}
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// Type is type of the struct.
func (c *Certificates) Type() string {
return "certificates"
}
// VerifyPeerCertificate verifies the chain certificates and their URI.
func VerifyPeerCertificate(uri string, cfg *tls.Config, rawCerts [][]byte) error {
// TODO: Refactor to avoid useless verifyChain (ex: when insecureskipverify is false)
cert, err := verifyChain(cfg.RootCAs, rawCerts)
if err != nil {
return err
}
if len(uri) > 0 {
return verifyServerCertMatchesURI(uri, cert)
}
return nil
}
// verifyServerCertMatchesURI is used on tls connections dialed to a server
// to ensure that the certificate it presented has the correct URI.
func verifyServerCertMatchesURI(uri string, cert *x509.Certificate) error {
if cert == nil {
return errors.New("peer certificate mismatch: no peer certificate presented")
}
// Our certs will only ever have a single URI for now so only check that
if len(cert.URIs) < 1 {
return errors.New("peer certificate mismatch: peer certificate invalid")
}
gotURI := cert.URIs[0]
// Override the hostname since we rely on x509 constraints to limit ability to spoof the trust domain if needed
// (i.e. because a root is shared with other PKI or Consul clusters).
// This allows for seamless migrations between trust domains.
expectURI := &url.URL{}
id, err := url.Parse(uri)
if err != nil {
return fmt.Errorf("%q is not a valid URI", uri)
}
*expectURI = *id
expectURI.Host = gotURI.Host
if strings.EqualFold(gotURI.String(), expectURI.String()) {
return nil
}
return fmt.Errorf("peer certificate mismatch got %s, want %s", gotURI, uri)
}
// verifyChain performs standard TLS verification without enforcing remote hostname matching.
func verifyChain(rootCAs *x509.CertPool, rawCerts [][]byte) (*x509.Certificate, error) {
// Fetch leaf and intermediates. This is based on code form tls handshake.
if len(rawCerts) < 1 {
return nil, errors.New("tls: no certificates from peer")
}
certs := make([]*x509.Certificate, len(rawCerts))
for i, asn1Data := range rawCerts {
cert, err := x509.ParseCertificate(asn1Data)
if err != nil {
return nil, fmt.Errorf("tls: failed to parse certificate from peer: %w", err)
}
certs[i] = cert
}
opts := x509.VerifyOptions{
Roots: rootCAs,
Intermediates: x509.NewCertPool(),
}
// All but the first cert are intermediates
for _, cert := range certs[1:] {
opts.Intermediates.AddCert(cert)
}
_, err := certs[0].Verify(opts)
if err != nil {
return nil, err
}
return certs[0], nil
}