package connect import ( "bytes" "crypto" "crypto/ecdsa" "crypto/elliptic" "crypto/rand" "crypto/x509" "crypto/x509/pkix" "encoding/pem" "fmt" "math/big" "net/url" "sync/atomic" "time" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/go-uuid" "github.com/mitchellh/go-testing-interface" ) // TestClusterID is the Consul cluster ID for testing. const TestClusterID = "11111111-2222-3333-4444-555555555555" // testCACounter is just an atomically incremented counter for creating // unique names for the CA certs. var testCACounter uint64 // TestCA creates a test CA certificate and signing key and returns it // in the CARoot structure format. The returned CA will be set as Active = true. // // If xc is non-nil, then the returned certificate will have a signing cert // that is cross-signed with the previous cert, and this will be set as // SigningCert. func TestCA(t testing.T, xc *structs.CARoot) *structs.CARoot { var result structs.CARoot result.Active = true result.Name = fmt.Sprintf("Test CA %d", atomic.AddUint64(&testCACounter, 1)) // Create the private key we'll use for this CA cert. signer, keyPEM := testPrivateKey(t) result.SigningKey = keyPEM // The serial number for the cert sn, err := testSerialNumber() if err != nil { t.Fatalf("error generating serial number: %s", err) } // The URI (SPIFFE compatible) for the cert id := &SpiffeIDSigning{ClusterID: TestClusterID, Domain: "consul"} // Create the CA cert template := x509.Certificate{ SerialNumber: sn, Subject: pkix.Name{CommonName: result.Name}, URIs: []*url.URL{id.URI()}, PermittedDNSDomainsCritical: true, PermittedDNSDomains: []string{id.URI().Hostname()}, BasicConstraintsValid: true, KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign | x509.KeyUsageDigitalSignature, IsCA: true, NotAfter: time.Now().Add(10 * 365 * 24 * time.Hour), NotBefore: time.Now(), AuthorityKeyId: testKeyID(t, signer.Public()), SubjectKeyId: testKeyID(t, signer.Public()), } bs, err := x509.CreateCertificate( rand.Reader, &template, &template, signer.Public(), signer) if err != nil { t.Fatalf("error generating CA certificate: %s", err) } var buf bytes.Buffer err = pem.Encode(&buf, &pem.Block{Type: "CERTIFICATE", Bytes: bs}) if err != nil { t.Fatalf("error encoding private key: %s", err) } result.RootCert = buf.String() result.ID, err = CalculateCertFingerprint(result.RootCert) if err != nil { t.Fatalf("error generating CA ID fingerprint: %s", err) } // If there is a prior CA to cross-sign with, then we need to create that // and set it as the signing cert. if xc != nil { xccert, err := ParseCert(xc.RootCert) if err != nil { t.Fatalf("error parsing CA cert: %s", err) } xcsigner, err := ParseSigner(xc.SigningKey) if err != nil { t.Fatalf("error parsing signing key: %s", err) } // Set the authority key to be the previous one. // NOTE(mitchellh): From Paul Banks: if we have to cross-sign a cert // that came from outside (e.g. vault) we can't rely on them using the // same KeyID hashing algo we do so we'd need to actually copy this // from the xc cert's subjectKeyIdentifier extension. template.AuthorityKeyId = testKeyID(t, xcsigner.Public()) // Create the new certificate where the parent is the previous // CA, the public key is the new public key, and the signing private // key is the old private key. bs, err := x509.CreateCertificate( rand.Reader, &template, xccert, signer.Public(), xcsigner) if err != nil { t.Fatalf("error generating CA certificate: %s", err) } var buf bytes.Buffer err = pem.Encode(&buf, &pem.Block{Type: "CERTIFICATE", Bytes: bs}) if err != nil { t.Fatalf("error encoding private key: %s", err) } result.SigningCert = buf.String() } return &result } // TestLeaf returns a valid leaf certificate and it's private key for the named // service with the given CA Root. func TestLeaf(t testing.T, service string, root *structs.CARoot) (string, string) { // Parse the CA cert and signing key from the root cert := root.SigningCert if cert == "" { cert = root.RootCert } caCert, err := ParseCert(cert) if err != nil { t.Fatalf("error parsing CA cert: %s", err) } caSigner, err := ParseSigner(root.SigningKey) if err != nil { t.Fatalf("error parsing signing key: %s", err) } // Build the SPIFFE ID spiffeId := &SpiffeIDService{ Host: fmt.Sprintf("%s.consul", TestClusterID), Namespace: "default", Datacenter: "dc1", Service: service, } // The serial number for the cert sn, err := testSerialNumber() if err != nil { t.Fatalf("error generating serial number: %s", err) } // Generate fresh private key pkSigner, pkPEM, err := GeneratePrivateKey() if err != nil { t.Fatalf("failed to generate private key: %s", err) } // Cert template for generation template := x509.Certificate{ SerialNumber: sn, Subject: pkix.Name{CommonName: service}, URIs: []*url.URL{spiffeId.URI()}, SignatureAlgorithm: x509.ECDSAWithSHA256, BasicConstraintsValid: true, KeyUsage: x509.KeyUsageDataEncipherment | x509.KeyUsageKeyAgreement | x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment, ExtKeyUsage: []x509.ExtKeyUsage{ x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth, }, NotAfter: time.Now().Add(10 * 365 * 24 * time.Hour), NotBefore: time.Now(), AuthorityKeyId: testKeyID(t, caSigner.Public()), SubjectKeyId: testKeyID(t, pkSigner.Public()), } // Create the certificate, PEM encode it and return that value. var buf bytes.Buffer bs, err := x509.CreateCertificate( rand.Reader, &template, caCert, pkSigner.Public(), caSigner) if err != nil { t.Fatalf("error generating certificate: %s", err) } err = pem.Encode(&buf, &pem.Block{Type: "CERTIFICATE", Bytes: bs}) if err != nil { t.Fatalf("error encoding private key: %s", err) } return buf.String(), pkPEM } // TestCSR returns a CSR to sign the given service along with the PEM-encoded // private key for this certificate. func TestCSR(t testing.T, uri CertURI) (string, string) { serviceId, ok := uri.(*SpiffeIDService) if !ok { t.Fatalf("SPIFFE ID in CSR must be a service ID") } template := &x509.CertificateRequest{ URIs: []*url.URL{uri.URI()}, SignatureAlgorithm: x509.ECDSAWithSHA256, Subject: pkix.Name{CommonName: serviceId.Service}, } // Create the private key we'll use signer, pkPEM := testPrivateKey(t) // Create the CSR itself var csrBuf bytes.Buffer bs, err := x509.CreateCertificateRequest(rand.Reader, template, signer) if err != nil { t.Fatalf("error creating CSR: %s", err) } err = pem.Encode(&csrBuf, &pem.Block{Type: "CERTIFICATE REQUEST", Bytes: bs}) if err != nil { t.Fatalf("error encoding CSR: %s", err) } return csrBuf.String(), pkPEM } // testKeyID returns a KeyID from the given public key. This just calls // KeyId but handles errors for tests. func testKeyID(t testing.T, raw interface{}) []byte { result, err := KeyId(raw) if err != nil { t.Fatalf("KeyId error: %s", err) } return result } // testPrivateKey creates an ECDSA based private key. Both a crypto.Signer and // the key in PEM form are returned. // // NOTE(banks): this was memoized to save entropy during tests but it turns out // crypto/rand will never block and always reads from /dev/urandom on unix OSes // which does not consume entropy. // // If we find by profiling it's taking a lot of cycles we could optimise/cache // again but we at least need to use different keys for each distinct CA (when // multiple CAs are generated at once e.g. to test cross-signing) and a // different one again for the leafs otherwise we risk tests that have false // positives since signatures from different logical cert's keys are // indistinguishable, but worse we build validation chains using AuthorityKeyID // which will be the same for multiple CAs/Leafs. Also note that our UUID // generator also reads from crypto rand and is called far more often during // tests than this will be. func testPrivateKey(t testing.T) (crypto.Signer, string) { pk, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader) if err != nil { t.Fatalf("error generating private key: %s", err) } bs, err := x509.MarshalECPrivateKey(pk) if err != nil { t.Fatalf("error generating private key: %s", err) } var buf bytes.Buffer err = pem.Encode(&buf, &pem.Block{Type: "EC PRIVATE KEY", Bytes: bs}) if err != nil { t.Fatalf("error encoding private key: %s", err) } return pk, buf.String() } // testSerialNumber generates a serial number suitable for a certificate. // For testing, this just sets it to a random number. // // This function is taken directly from the Vault implementation. func testSerialNumber() (*big.Int, error) { return rand.Int(rand.Reader, (&big.Int{}).Exp(big.NewInt(2), big.NewInt(159), nil)) } // testUUID generates a UUID for testing. func testUUID(t testing.T) string { ret, err := uuid.GenerateUUID() if err != nil { t.Fatalf("Unable to generate a UUID, %s", err) } return ret } // TestAgentRPC is an interface that an RPC client must implement. This is a // helper interface that is implemented by the agent delegate so that test // helpers can make RPCs without introducing an import cycle on `agent`. type TestAgentRPC interface { RPC(method string, args interface{}, reply interface{}) error } // TestCAConfigSet sets a CARoot returned by TestCA into the TestAgent state. It // requires that TestAgent had connect enabled in it's config. If ca is nil, a // new CA is created. // // It returns the CARoot passed or created. // // Note that we have to use an interface for the TestAgent.RPC method since we // can't introduce an import cycle by importing `agent.TestAgent` here directly. // It also means this will work in a few other places we mock that method. func TestCAConfigSet(t testing.T, a TestAgentRPC, ca *structs.CARoot) *structs.CARoot { t.Helper() if ca == nil { ca = TestCA(t, nil) } newConfig := &structs.CAConfiguration{ Provider: "consul", Config: map[string]interface{}{ "PrivateKey": ca.SigningKey, "RootCert": ca.RootCert, "RotationPeriod": 180 * 24 * time.Hour, }, } args := &structs.CARequest{ Datacenter: "dc1", Config: newConfig, } var reply interface{} err := a.RPC("ConnectCA.ConfigurationSet", args, &reply) if err != nil { t.Fatalf("failed to set test CA config: %s", err) } return ca }