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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,283 @@ | ||
| // Copyright 2022 PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package security | ||
|
|
||
| import ( | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "encoding/pem" | ||
| "os" | ||
| "sync/atomic" | ||
| "time" | ||
|
|
||
| "github.com/pingcap/TiProxy/lib/config" | ||
| "github.com/pingcap/TiProxy/lib/util/errors" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| var emptyCert = new(tls.Certificate) | ||
|
|
||
| type CertInfo struct { | ||
| cfg config.TLSConfig | ||
| ca atomic.Value | ||
| cert atomic.Value | ||
| expire atomic.Int64 | ||
| server bool | ||
| } | ||
|
|
||
| func NewCert(lg *zap.Logger, cfg config.TLSConfig, server bool) (*CertInfo, *tls.Config, error) { | ||
| ci := &CertInfo{ | ||
| cfg: cfg, | ||
| server: server, | ||
| } | ||
| tlscfg, err := ci.reload(lg) | ||
| return ci, tlscfg, err | ||
| } | ||
|
|
||
| func (ci *CertInfo) Reload(lg *zap.Logger, n time.Time) error { | ||
| if n.Unix() <= ci.expire.Load() { | ||
| return nil | ||
| } | ||
| _, err := ci.reload(lg) | ||
| return err | ||
| } | ||
|
|
||
| func (ci *CertInfo) reload(lg *zap.Logger) (*tls.Config, error) { | ||
| var tlsConfig *tls.Config | ||
| var err error | ||
| // Some methods to rotate server config: | ||
| // - For certs: customize GetCertificate / GetConfigForClient. | ||
| // - For CA: customize ClientAuth + VerifyPeerCertificate / GetConfigForClient | ||
| // Some methods to rotate client config: | ||
| // - For certs: customize GetClientCertificate | ||
| // - For CA: customize InsecureSkipVerify + VerifyPeerCertificate | ||
| if ci.server { | ||
| tlsConfig, err = ci.buildServerConfig(lg) | ||
| } else { | ||
| tlsConfig, err = ci.buildClientConfig(lg) | ||
| } | ||
| return tlsConfig, err | ||
| } | ||
|
|
||
| func (ci *CertInfo) getCert(*tls.ClientHelloInfo) (*tls.Certificate, error) { | ||
| cert := ci.cert.Load() | ||
| if val, ok := cert.(*tls.Certificate); ok { | ||
| return val, nil | ||
| } | ||
| return nil, nil | ||
| } | ||
|
|
||
| func (ci *CertInfo) getClientCert(*tls.CertificateRequestInfo) (*tls.Certificate, error) { | ||
| cert := ci.cert.Load() | ||
| if val, ok := cert.(*tls.Certificate); ok { | ||
| return val, nil | ||
| } | ||
| if cert == nil { | ||
| // GetClientCertificate must return a non-nil Certificate. | ||
| return emptyCert, nil | ||
| } | ||
| return nil, nil | ||
| } | ||
|
|
||
| func (ci *CertInfo) verifyPeerCertificate(rawCerts [][]byte, _ [][]*x509.Certificate) error { | ||
| if len(rawCerts) == 0 { | ||
| return nil | ||
| } | ||
|
|
||
| certs := make([]*x509.Certificate, len(rawCerts)) | ||
| for i, asn1Data := range rawCerts { | ||
| cert, err := x509.ParseCertificate(asn1Data) | ||
| if err != nil { | ||
| return errors.New("tls: failed to parse certificate from server: " + err.Error()) | ||
| } | ||
| certs[i] = cert | ||
| } | ||
|
|
||
| cas, ok := ci.ca.Load().(*x509.CertPool) | ||
| if !ok { | ||
| cas = x509.NewCertPool() | ||
| } | ||
| opts := x509.VerifyOptions{ | ||
| Roots: cas, | ||
| Intermediates: x509.NewCertPool(), | ||
| } | ||
| if ci.server { | ||
| opts.KeyUsages = []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth} | ||
| } | ||
| // TODO: not implemented, maybe later | ||
| // opts.DNSName = ci.serverName | ||
| for _, cert := range certs[1:] { | ||
| opts.Intermediates.AddCert(cert) | ||
| } | ||
| _, err := certs[0].Verify(opts) | ||
| return err | ||
| } | ||
|
|
||
| func (ci *CertInfo) updateMinExpire(n int64) { | ||
| for o := ci.expire.Load(); o > n && !ci.expire.CompareAndSwap(o, n); o = ci.expire.Load() { | ||
| } | ||
| } | ||
|
|
||
| func (ci *CertInfo) loadCA(pemCerts []byte) (*x509.CertPool, error) { | ||
| pool := x509.NewCertPool() | ||
| for len(pemCerts) > 0 { | ||
| var block *pem.Block | ||
| block, pemCerts = pem.Decode(pemCerts) | ||
| if block == nil { | ||
| break | ||
| } | ||
| if block.Type != "CERTIFICATE" || len(block.Headers) != 0 { | ||
| continue | ||
| } | ||
|
|
||
| certBytes := block.Bytes | ||
| cert, err := x509.ParseCertificate(certBytes) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| ci.updateMinExpire(cert.NotAfter.Unix()) | ||
|
|
||
| pool.AddCert(cert) | ||
| } | ||
| return pool, nil | ||
| } | ||
|
|
||
| func (ci *CertInfo) buildServerConfig(lg *zap.Logger) (*tls.Config, error) { | ||
| lg = lg.With(zap.String("tls", "server"), zap.Any("cfg", ci.cfg)) | ||
| autoCerts := false | ||
| if !ci.cfg.HasCert() { | ||
| if ci.cfg.AutoCerts { | ||
| autoCerts = true | ||
| } else { | ||
| lg.Warn("require certificates to secure clients connections, disable TLS") | ||
| return nil, nil | ||
| } | ||
| } | ||
|
|
||
| tcfg := &tls.Config{ | ||
| MinVersion: tls.VersionTLS12, | ||
| GetCertificate: ci.getCert, | ||
| GetClientCertificate: ci.getClientCert, | ||
| VerifyPeerCertificate: ci.verifyPeerCertificate, | ||
| } | ||
|
|
||
| var certPEM, keyPEM, caPEM []byte | ||
| var err error | ||
| if autoCerts { | ||
| dur, err := time.ParseDuration(ci.cfg.AutoExpireDuration) | ||
| if err != nil { | ||
| dur = DefaultCertExpiration | ||
| } | ||
| certPEM, keyPEM, caPEM, err = CreateTempTLS(ci.cfg.RSAKeySize, dur) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } else { | ||
| certPEM, err = os.ReadFile(ci.cfg.Cert) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| keyPEM, err = os.ReadFile(ci.cfg.Key) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if !ci.cfg.HasCA() { | ||
| lg.Warn("no CA, server will not authenticate clients (connection is still secured)") | ||
| return tcfg, nil | ||
| } else { | ||
| caPEM, err = os.ReadFile(ci.cfg.CA) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| } | ||
|
|
||
| cert, err := tls.X509KeyPair(certPEM, keyPEM) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| for _, c := range cert.Certificate { | ||
| cp, err := x509.ParseCertificate(c) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| ci.updateMinExpire(cp.NotAfter.Unix()) | ||
| } | ||
| ci.cert.Store(&cert) | ||
|
|
||
| if len(caPEM) != 0 { | ||
| cas, err := ci.loadCA(caPEM) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| ci.ca.Store(cas) | ||
| tcfg.ClientAuth = tls.RequireAnyClientCert | ||
| } | ||
| return tcfg, nil | ||
| } | ||
|
|
||
| func (ci *CertInfo) buildClientConfig(lg *zap.Logger) (*tls.Config, error) { | ||
| lg = lg.With(zap.String("tls", "client"), zap.Any("cfg", ci.cfg)) | ||
| if !ci.cfg.HasCA() { | ||
| if ci.cfg.SkipCA { | ||
| // still enable TLS without verify server certs | ||
| return &tls.Config{ | ||
| InsecureSkipVerify: true, | ||
| MinVersion: tls.VersionTLS12, | ||
| }, nil | ||
| } | ||
| lg.Warn("no CA to verify server connections, disable TLS") | ||
| return nil, nil | ||
| } | ||
|
|
||
| tcfg := &tls.Config{ | ||
| MinVersion: tls.VersionTLS12, | ||
| GetCertificate: ci.getCert, | ||
| GetClientCertificate: ci.getClientCert, | ||
| InsecureSkipVerify: true, | ||
| VerifyPeerCertificate: ci.verifyPeerCertificate, | ||
| } | ||
|
|
||
| certBytes, err := os.ReadFile(ci.cfg.CA) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| cas, err := ci.loadCA(certBytes) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| ci.ca.Store(cas) | ||
|
|
||
| if !ci.cfg.HasCert() { | ||
| lg.Warn("no certificates, server may reject the connection") | ||
| return tcfg, nil | ||
| } | ||
|
|
||
| cert, err := tls.LoadX509KeyPair(ci.cfg.Cert, ci.cfg.Key) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| for _, c := range cert.Certificate { | ||
| cp, err := x509.ParseCertificate(c) | ||
| if err != nil { | ||
| return nil, errors.WithStack(err) | ||
| } | ||
| ci.updateMinExpire(cp.NotAfter.Unix()) | ||
| } | ||
| ci.cert.Store(&cert) | ||
|
|
||
| return tcfg, nil | ||
| } |
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