agent/cert: properly return the cached client on AuthClient (#11576)

* agent/cert: properly return the cached client on AuthClient

* test: pass in nil client config, check on pointer values directly

* test: pass in nil client config

* changelog: add changelog entry

changelog/11576.txt

@@ -0,0 +1,4 @@
+```release-note:bug
+agent/cert: Fix issue where the API client on agent was not honoring certificate
+information from the auto-auth config map on renewals or retries.
+```

command/agent/auth/cert/cert.go

@@ -108,7 +108,7 @@ func (c *certMethod) AuthClient(client *api.Client) (*api.Client, error) {
 	if c.caCert != "" || (c.clientKey != "" && c.clientCert != "") {
 		// Return cached client if present
 		if c.client != nil {
-			return client, nil
+			return c.client, nil
 		}
 
 		config := api.DefaultConfig()

command/agent/auth/cert/cert_test.go

@@ -0,0 +1,133 @@
+package cert
+
+import (
+	"context"
+	"os"
+	"path"
+	"reflect"
+	"testing"
+
+	"github.com/hashicorp/go-hclog"
+	"github.com/hashicorp/vault/api"
+	"github.com/hashicorp/vault/command/agent/auth"
+)
+
+func TestCertAuthMethod_Authenticate(t *testing.T) {
+	config := &auth.AuthConfig{
+		Logger:    hclog.NewNullLogger(),
+		MountPath: "cert-test",
+		Config: map[string]interface{}{
+			"name": "foo",
+		},
+	}
+
+	method, err := NewCertAuthMethod(config)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	client, err := api.NewClient(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	loginPath, _, authMap, err := method.Authenticate(context.Background(), client)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expectedLoginPath := path.Join(config.MountPath, "/login")
+	if loginPath != expectedLoginPath {
+		t.Fatalf("mismatch on login path: got: %s, expected: %s", loginPath, expectedLoginPath)
+	}
+
+	expectedAuthMap := map[string]interface{}{
+		"name": config.Config["name"],
+	}
+	if !reflect.DeepEqual(authMap, expectedAuthMap) {
+		t.Fatalf("mismatch on login path:\ngot:\n\t%v\nexpected:\n\t%v", authMap, expectedAuthMap)
+	}
+}
+
+func TestCertAuthMethod_AuthClient_withoutCerts(t *testing.T) {
+	config := &auth.AuthConfig{
+		Logger:    hclog.NewNullLogger(),
+		MountPath: "cert-test",
+		Config: map[string]interface{}{
+			"name": "without-certs",
+		},
+	}
+
+	method, err := NewCertAuthMethod(config)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	client, err := api.NewClient(api.DefaultConfig())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	clientToUse, err := method.(auth.AuthMethodWithClient).AuthClient(client)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if client != clientToUse {
+		t.Fatal("error: expected AuthClient to return back original client")
+	}
+}
+
+func TestCertAuthMethod_AuthClient_withCerts(t *testing.T) {
+
+	clientCert, err := os.Open("./test-fixtures/keys/cert.pem")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer clientCert.Close()
+
+	clientKey, err := os.Open("./test-fixtures/keys/key.pem")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer clientKey.Close()
+
+	config := &auth.AuthConfig{
+		Logger:    hclog.NewNullLogger(),
+		MountPath: "cert-test",
+		Config: map[string]interface{}{
+			"name":        "with-certs",
+			"client_cert": clientCert.Name(),
+			"client_key":  clientKey.Name(),
+		},
+	}
+
+	method, err := NewCertAuthMethod(config)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	client, err := api.NewClient(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	clientToUse, err := method.(auth.AuthMethodWithClient).AuthClient(client)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if client == clientToUse {
+		t.Fatal("expected client from AuthClient to be different from original client")
+	}
+
+	// Call AuthClient again to get back the cached client
+	cachedClient, err := method.(auth.AuthMethodWithClient).AuthClient(client)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if cachedClient != clientToUse {
+		t.Fatal("expected client from AuthClient to return back a cached client")
+	}
+}

command/agent/auth/cert/test-fixtures/keys/cert.pem

@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----
+MIIDtTCCAp2gAwIBAgIUf+jhKTFBnqSs34II0WS1L4QsbbAwDQYJKoZIhvcNAQEL
+BQAwFjEUMBIGA1UEAxMLZXhhbXBsZS5jb20wHhcNMTYwMjI5MDIyNzQxWhcNMjUw
+MTA1MTAyODExWjAbMRkwFwYDVQQDExBjZXJ0LmV4YW1wbGUuY29tMIIBIjANBgkq
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+TRAVnygAftetT8puHflY0ss7Y6X2OXjsU0PRn+1PswtivhKi+eLtgWkUF9cFYFGn
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+xqKHA8Purc1Yfybz4iE1JCROi9fInKlzr5xABq8nb9Qc/J9DIQM+Xmk=
+-----END CERTIFICATE-----

command/agent/auth/cert/test-fixtures/keys/key.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEogIBAAKCAQEAsZx0Svr82YJpFpIy4fJNW5fKA6B8mhxSTRAVnygAftetT8pu
+HflY0ss7Y6X2OXjsU0PRn+1PswtivhKi+eLtgWkUF9cFYFGnSgMld6ZWRhNheZhA
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+gYC2qCpvVD9RRUMKFfnJTfl5gMQdBW/LINkHtJ82snAeLl3gjQ4=
+-----END RSA PRIVATE KEY-----

command/agent/auth/cert/test-fixtures/keys/pkioutput

@@ -0,0 +1,74 @@
+Key             	Value
+lease_id        	pki/issue/example-dot-com/d8214077-9976-8c68-9c07-6610da30aea4
+lease_duration  	279359999
+lease_renewable 	false
+certificate     	-----BEGIN CERTIFICATE-----
+MIIDtTCCAp2gAwIBAgIUf+jhKTFBnqSs34II0WS1L4QsbbAwDQYJKoZIhvcNAQEL
+BQAwFjEUMBIGA1UEAxMLZXhhbXBsZS5jb20wHhcNMTYwMjI5MDIyNzQxWhcNMjUw
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+xqKHA8Purc1Yfybz4iE1JCROi9fInKlzr5xABq8nb9Qc/J9DIQM+Xmk=
+-----END CERTIFICATE-----
+issuing_ca      	-----BEGIN CERTIFICATE-----
+MIIDPDCCAiSgAwIBAgIUb5id+GcaMeMnYBv3MvdTGWigyJ0wDQYJKoZIhvcNAQEL
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+zehNe5dFTjFpylg1o6b8Ow==
+-----END CERTIFICATE-----
+private_key     	-----BEGIN RSA PRIVATE KEY-----
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+gYC2qCpvVD9RRUMKFfnJTfl5gMQdBW/LINkHtJ82snAeLl3gjQ4=
+-----END RSA PRIVATE KEY-----
+private_key_type	rsa

command/agent/auth/cert/test-fixtures/root/pkioutput

@@ -0,0 +1,74 @@
+Key             	Value
+lease_id        	pki/root/generate/exported/7bf99d76-dd3e-2c5b-04ce-5253062ad586
+lease_duration  	315359999
+lease_renewable 	false
+certificate     	-----BEGIN CERTIFICATE-----
+MIIDPDCCAiSgAwIBAgIUb5id+GcaMeMnYBv3MvdTGWigyJ0wDQYJKoZIhvcNAQEL
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+-----END CERTIFICATE-----
+expiration      	1.772072879e+09
+issuing_ca      	-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+private_key     	-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
+private_key_type	rsa
+serial_number   	6f:98:9d:f8:67:1a:31:e3:27:60:1b:f7:32:f7:53:19:68:a0:c8:9d

command/agent/auth/cert/test-fixtures/root/root.crl

@@ -0,0 +1,12 @@
+-----BEGIN X509 CRL-----
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+IA0=
+-----END X509 CRL-----

command/agent/auth/cert/test-fixtures/root/rootcacert.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
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+zehNe5dFTjFpylg1o6b8Ow==
+-----END CERTIFICATE-----

command/agent/auth/cert/test-fixtures/root/rootcakey.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----