Add client method for SSHBastion

ca/client.go

@@ -694,6 +694,27 @@ func (c *Client) SSHGetHosts() (*api.SSHGetHostsResponse, error) {
 	return &hosts, nil
 }
 
+// SSHBastion performs the POST /ssh/bastion request to the CA.
+func (c *Client) SSHBastion(req *api.SSHBastionRequest) (*api.SSHBastionResponse, error) {
+	body, err := json.Marshal(req)
+	if err != nil {
+		return nil, errors.Wrap(err, "error marshaling request")
+	}
+	u := c.endpoint.ResolveReference(&url.URL{Path: "/ssh/bastion"})
+	resp, err := c.client.Post(u.String(), "application/json", bytes.NewReader(body))
+	if err != nil {
+		return nil, errors.Wrapf(err, "client POST %s failed", u)
+	}
+	if resp.StatusCode >= 400 {
+		return nil, readError(resp.Body)
+	}
+	var bastion api.SSHBastionResponse
+	if err := readJSON(resp.Body, &bastion); err != nil {
+		return nil, errors.Wrapf(err, "error reading %s", u)
+	}
+	return &bastion, nil
+}
+
 // RootFingerprint is a helper method that returns the current root fingerprint.
 // It does an health connection and gets the fingerprint from the TLS verified
 // chains.

ca/client_test.go

@@ -18,6 +18,7 @@ import (
 
 	"github.com/smallstep/assert"
 	"github.com/smallstep/certificates/api"
+	"github.com/smallstep/certificates/authority"
 	"github.com/smallstep/certificates/authority/provisioner"
 	"github.com/smallstep/cli/crypto/x509util"
 	"golang.org/x/crypto/ssh"
@@ -882,3 +883,64 @@ func TestClient_RootFingerprintWithServer(t *testing.T) {
 	assert.FatalError(t, err)
 	assert.Equals(t, "ef742f95dc0d8aa82d3cca4017af6dac3fce84290344159891952d18c53eefe7", fp)
 }
+
+func TestClient_SSHBastion(t *testing.T) {
+	ok := &api.SSHBastionResponse{
+		Hostname: "host.local",
+		Bastion: &authority.Bastion{
+			Hostname: "bastion.local",
+		},
+	}
+	badRequest := api.BadRequest(fmt.Errorf("Bad Request"))
+
+	tests := []struct {
+		name         string
+		request      *api.SSHBastionRequest
+		response     interface{}
+		responseCode int
+		wantErr      bool
+	}{
+		{"ok", &api.SSHBastionRequest{Hostname: "host.local"}, ok, 200, false},
+		{"bad response", &api.SSHBastionRequest{Hostname: "host.local"}, "bad json", 200, true},
+		{"empty request", &api.SSHBastionRequest{}, badRequest, 403, true},
+		{"nil request", nil, badRequest, 403, true},
+	}
+
+	srv := httptest.NewServer(nil)
+	defer srv.Close()
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			c, err := NewClient(srv.URL, WithTransport(http.DefaultTransport))
+			if err != nil {
+				t.Errorf("NewClient() error = %v", err)
+				return
+			}
+
+			srv.Config.Handler = http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+				api.JSONStatus(w, tt.response, tt.responseCode)
+			})
+
+			got, err := c.SSHBastion(tt.request)
+			if (err != nil) != tt.wantErr {
+				fmt.Printf("%+v", err)
+				t.Errorf("Client.SSHBastion() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+
+			switch {
+			case err != nil:
+				if got != nil {
+					t.Errorf("Client.SSHBastion() = %v, want nil", got)
+				}
+				if tt.responseCode != 200 && !reflect.DeepEqual(err, tt.response) {
+					t.Errorf("Client.SSHBastion() error = %v, want %v", err, tt.response)
+				}
+			default:
+				if !reflect.DeepEqual(got, tt.response) {
+					t.Errorf("Client.SSHBastion() = %v, want %v", got, tt.response)
+				}
+			}
+		})
+	}
+}