package tls import ( "crypto/tls" "crypto/x509" "fmt" "io/ioutil" "os" "sort" "strings" "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, } // 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 // Certs and Key could be either a file path, or the file content itself. type Certificate struct { 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 f.IsPath() { var err error 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, error) { config := &tls.Config{} domainsCertificates := make(map[string]map[string]*tls.Certificate) if c.isEmpty() { config.Certificates = []tls.Certificate{} cert, err := generate.DefaultCertificate() if err != nil { return nil, err } 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 } for _, certDom := range domainsCertificates { for _, cert := range certDom { config.Certificates = append(config.Certificates, *cert) } } } } 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 : %w", err) } keyContent, err := c.KeyFile.Read() if err != nil { return fmt.Errorf("unable to read KeyFile : %w", err) } tlsCert, err := tls.X509KeyPair(certContent, keyContent) if err != nil { return fmt.Errorf("unable to generate TLS certificate : %w", err) } parsedCert, _ := x509.ParseCertificate(tlsCert.Certificate[0]) var SANs []string if parsedCert.Subject.CommonName != "" { SANs = append(SANs, strings.ToLower(parsedCert.Subject.CommonName)) } if parsedCert.DNSNames != nil { sort.Strings(parsedCert.DNSNames) for _, dnsName := range parsedCert.DNSNames { if dnsName != parsedCert.Subject.CommonName { SANs = append(SANs, strings.ToLower(dnsName)) } } } if parsedCert.IPAddresses != nil { for _, ip := range parsedCert.IPAddresses { if ip.String() != parsedCert.Subject.CommonName { SANs = append(SANs, strings.ToLower(ip.String())) } } } 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.Debugf("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" }