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Move certs & helper code from /internal/examples to /internal (#201)
Fixes #199
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| package internal | ||
|
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| // This file contains helper functions to read and | ||
| // create TLS configs/certificates. Currently used in | ||
| // the example client and server and | ||
| // in the tests. Not intended for any other use. | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "crypto/rsa" | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "crypto/x509/pkix" | ||
| "encoding/pem" | ||
| "errors" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "math/big" | ||
| "net" | ||
| "os" | ||
| "time" | ||
|
|
||
| "github.com/open-telemetry/opamp-go/protobufs" | ||
| ) | ||
|
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| func CreateClientTLSConfig(clientCert *tls.Certificate, caCertPath string) (*tls.Config, error) { | ||
| // Read the CA's public key. This is the CA that signs the server's certificate. | ||
| caCertBytes, err := os.ReadFile(caCertPath) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Create a certificate pool and make our CA trusted. | ||
| caCertPool := x509.NewCertPool() | ||
| if ok := caCertPool.AppendCertsFromPEM(caCertBytes); !ok { | ||
| return nil, errors.New("cannot append ca.cert.pem") | ||
| } | ||
|
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| cfg := &tls.Config{ | ||
| RootCAs: caCertPool, | ||
| } | ||
| if clientCert != nil { | ||
| // If there is a client-side certificate use it for connection too. | ||
| cfg.Certificates = []tls.Certificate{*clientCert} | ||
| } | ||
| return cfg, nil | ||
| } | ||
|
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||
| func CreateServerTLSConfig(caCertPath, serverCertPath, serverKeyPath string) (*tls.Config, error) { | ||
| // Read the CA's public key. This is the CA that signs the server's certificate. | ||
| caCertBytes, err := os.ReadFile(caCertPath) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Create a certificate pool and make our CA trusted. | ||
| caCertPool := x509.NewCertPool() | ||
| if ok := caCertPool.AppendCertsFromPEM(caCertBytes); !ok { | ||
| return nil, errors.New("cannot append ca.cert.pem") | ||
| } | ||
|
|
||
| // Load server's certificate. | ||
| cert, err := tls.LoadX509KeyPair( | ||
| serverCertPath, | ||
| serverKeyPath, | ||
| ) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("tls.LoadX509KeyPair failed: %v", err) | ||
| } | ||
| tlsConfig := &tls.Config{ | ||
| Certificates: []tls.Certificate{cert}, | ||
| // TODO: verify client cert manually, and allow TOFU option. See manual | ||
| // verification example: https://dev.to/living_syn/validating-client-certificate-sans-in-go-i5p | ||
| // Instead, we use VerifyClientCertIfGiven which will automatically verify the provided certificate | ||
| // is signed by our CA (so TOFU with self-generated client certificate will not work). | ||
| ClientAuth: tls.VerifyClientCertIfGiven, | ||
| // Allow insecure connections for demo purposes. | ||
| InsecureSkipVerify: true, | ||
| ClientCAs: caCertPool, | ||
| } | ||
| tlsConfig.BuildNameToCertificate() | ||
| return tlsConfig, nil | ||
| } | ||
|
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||
| func CreateTLSCert(caCertPath, caKeyPath string) (*protobufs.TLSCertificate, error) { | ||
|
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| // Load CA Cert. | ||
| caCertBytes, err := ioutil.ReadFile(caCertPath) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot read CA cert: %v", err) | ||
| } | ||
|
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||
| caKeyBytes, err := ioutil.ReadFile(caKeyPath) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot read CA key: %v", err) | ||
| } | ||
|
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||
| caCertPB, _ := pem.Decode(caCertBytes) | ||
| caKeyPB, _ := pem.Decode(caKeyBytes) | ||
| caCert, err := x509.ParseCertificate(caCertPB.Bytes) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot parse CA cert: %v", err) | ||
| } | ||
|
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| caPrivKey, err := x509.ParsePKCS1PrivateKey(caKeyPB.Bytes) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot parse CA key: %v", err) | ||
| } | ||
|
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||
| // Generate a private key for new client cert. | ||
| certPrivKey, err := rsa.GenerateKey(rand.Reader, 4096) | ||
| if err != nil { | ||
| err := fmt.Errorf("cannot generate private key: %v", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| // Prepare certificate template. | ||
| template := &x509.Certificate{ | ||
| SerialNumber: big.NewInt(1), | ||
| Subject: pkix.Name{ | ||
| CommonName: "OpAMP Example Client", | ||
| Organization: []string{"OpAMP Example"}, | ||
| Country: []string{"CA"}, | ||
| Province: []string{"ON"}, | ||
| Locality: []string{"City"}, | ||
| StreetAddress: []string{""}, | ||
| PostalCode: []string{""}, | ||
| }, | ||
| IPAddresses: []net.IP{net.IPv4(127, 0, 0, 1)}, | ||
| NotBefore: time.Now(), | ||
| NotAfter: time.Now().Add(time.Hour * 1000), | ||
| ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}, | ||
| KeyUsage: x509.KeyUsageDigitalSignature, | ||
| } | ||
|
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| // Create the client cert. Sign it using CA cert. | ||
| certBytes, err := x509.CreateCertificate(rand.Reader, template, caCert, &certPrivKey.PublicKey, caPrivKey) | ||
| if err != nil { | ||
| err := fmt.Errorf("cannot create certificate: %v", err) | ||
| return nil, err | ||
| } | ||
|
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| publicKeyPEM := new(bytes.Buffer) | ||
| pem.Encode(publicKeyPEM, &pem.Block{ | ||
| Type: "CERTIFICATE", | ||
| Bytes: certBytes, | ||
| }) | ||
|
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| privateKeyPEM := new(bytes.Buffer) | ||
| pem.Encode(privateKeyPEM, &pem.Block{ | ||
| Type: "RSA PRIVATE KEY", | ||
| Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey), | ||
| }) | ||
|
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| // We have a client certificate with a public and private key. | ||
| certificate := &protobufs.TLSCertificate{ | ||
| PublicKey: publicKeyPEM.Bytes(), | ||
| PrivateKey: privateKeyPEM.Bytes(), | ||
| CaPublicKey: caCertBytes, | ||
| } | ||
|
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||
| return certificate, nil | ||
| } |
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