mirror of
https://github.com/gravitational/teleport
synced 2024-10-22 18:23:25 +00:00
0130c6aa41
This commit introduced mutual TLS authentication for auth server API server. Auth server multiplexes HTTP over SSH - existing protocol and HTTP over TLS - new protocol on the same listening socket. Nodes and users authenticate with 2.5.0 Teleport using TLS mutual TLS except backwards-compatibility cases.
164 lines
4.8 KiB
Go
164 lines
4.8 KiB
Go
/*
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Copyright 2015 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"math/big"
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"net"
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"os"
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"time"
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"github.com/gravitational/trace"
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log "github.com/sirupsen/logrus"
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)
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// ListenTLS sets up TLS listener for the http handler, starts listening
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// on a TCP socket and returns the socket which is ready to be used
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// for http.Serve
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func ListenTLS(address string, certFile, keyFile string) (net.Listener, error) {
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tlsConfig, err := CreateTLSConfiguration(certFile, keyFile)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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return tls.Listen("tcp", address, tlsConfig)
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}
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// TLSConfig returns default TLS configuration with
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// strict TLS settings configured (e.g. min TLS1.2)
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func TLSConfig() *tls.Config {
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config := &tls.Config{}
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config.CipherSuites = []uint16{
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
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tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
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tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
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tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
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tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
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tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
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tls.TLS_RSA_WITH_AES_256_CBC_SHA,
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tls.TLS_RSA_WITH_AES_128_CBC_SHA,
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}
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config.MinVersion = tls.VersionTLS12
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config.SessionTicketsDisabled = false
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config.ClientSessionCache = tls.NewLRUClientSessionCache(
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DefaultLRUCapacity)
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return config
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}
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// CreateTLSConfiguration sets up default TLS configuration
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func CreateTLSConfiguration(certFile, keyFile string) (*tls.Config, error) {
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config := TLSConfig()
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if _, err := os.Stat(certFile); err != nil {
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return nil, trace.BadParameter("certificate is not accessible by '%v'", certFile)
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}
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if _, err := os.Stat(keyFile); err != nil {
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return nil, trace.BadParameter("certificate is not accessible by '%v'", certFile)
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}
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log.Infof("[PROXY] TLS cert=%v key=%v", certFile, keyFile)
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cert, err := tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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config.Certificates = []tls.Certificate{cert}
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return config, nil
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}
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// TLSCredentials keeps the typical 3 components of a proper HTTPS configuration
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type TLSCredentials struct {
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// PublicKey in PEM format
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PublicKey []byte
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// PrivateKey in PEM format
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PrivateKey []byte
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Cert []byte
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}
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// GenerateSelfSignedCert generates a self signed certificate that
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// is valid for given domain names and ips, returns PEM-encoded bytes with key and cert
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func GenerateSelfSignedCert(hostNames []string) (*TLSCredentials, error) {
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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notBefore := time.Now()
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notAfter := notBefore.Add(time.Hour * 24 * 365 * 10) // 10 years
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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entity := pkix.Name{
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CommonName: "localhost",
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Country: []string{"US"},
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Organization: []string{"localhost"},
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Issuer: entity,
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Subject: entity,
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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BasicConstraintsValid: true,
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IsCA: true,
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}
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// collect IP addresses localhost resolves to and add them to the cert. template:
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template.DNSNames = append(hostNames, "localhost.local")
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ips, _ := net.LookupIP("localhost")
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if ips != nil {
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template.IPAddresses = ips
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}
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
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if err != nil {
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return nil, trace.Wrap(err)
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}
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publicKeyBytes, err := x509.MarshalPKIXPublicKey(priv.Public())
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if err != nil {
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log.Error(err)
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return nil, trace.Wrap(err)
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}
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return &TLSCredentials{
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PublicKey: pem.EncodeToMemory(&pem.Block{Type: "RSA PUBLIC KEY", Bytes: publicKeyBytes}),
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PrivateKey: pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}),
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Cert: pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes}),
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}, nil
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}
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const (
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// DefaultLRUCapacity is a capacity for LRU session cache
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DefaultLRUCapacity = 1024
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// DefaultCertTTL sets the TTL of the self-signed certificate (1 year)
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DefaultCertTTL = (24 * time.Hour) * 365
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)
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