Merge pull request #13 from suzerain-io/add-ca-code
Add initial CA code.
This commit is contained in:
Matt Moyer
GitHub
commit
5a66b56b93
@ -51,11 +51,12 @@ linters:
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issues:
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exclude-rules:
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# exclude tests from function length and global linting to encourage table-based tests.
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# exclude tests from some rules for things that are useful in a testing context.
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- path: _test\.go
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linters:
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- funlen
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- gochecknoglobals
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- goerr113
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linters-settings:
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funlen:
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@ -7,34 +7,50 @@ SPDX-License-Identifier: Apache-2.0
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package app
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import (
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"context"
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"crypto/tls"
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"crypto/x509/pkix"
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"errors"
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"fmt"
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"io"
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"log"
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"net"
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"net/http"
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"time"
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"github.com/spf13/cobra"
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"golang.org/x/sync/errgroup"
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"github.com/suzerain-io/placeholder-name/internal/certauthority"
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"github.com/suzerain-io/placeholder-name/pkg/handlers"
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)
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// shutdownGracePeriod controls how long active connections are allowed to continue at shutdown.
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const shutdownGracePeriod = 5 * time.Second
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// App is an object that represents the placeholder-name application.
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type App struct {
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cmd *cobra.Command
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// listen address for healthz serve
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healthAddr string
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// listen address for main serve
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mainAddr string
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// runFunc runs the actual program, after the parsing of flags has been done.
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//
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// It is mostly a field for the sake of testing.
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runFunc func(configPath string)
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runFunc func(ctx context.Context, configPath string) error
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}
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// New constructs a new App with command line args, stdout and stderr.
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func New(args []string, stdout, stderr io.Writer) *App {
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a := &App{
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runFunc: func(configPath string) {
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addr := ":8080"
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log.Printf("Starting server on %v", addr)
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log.Fatal(http.ListenAndServe(addr, handlers.New()))
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},
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healthAddr: ":8080",
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mainAddr: ":8443",
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}
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a.runFunc = a.serve
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var configPath string
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cmd := &cobra.Command{
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@ -42,8 +58,8 @@ func New(args []string, stdout, stderr io.Writer) *App {
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Long: `placeholder-name provides a generic API for mapping an external
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credential from somewhere to an internal credential to be used for
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authenticating to the Kubernetes API.`,
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Run: func(cmd *cobra.Command, args []string) {
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a.runFunc(configPath)
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RunE: func(cmd *cobra.Command, args []string) error {
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return a.runFunc(context.Background(), configPath)
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},
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Args: cobra.NoArgs,
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}
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@ -68,3 +84,76 @@ authenticating to the Kubernetes API.`,
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func (a *App) Run() error {
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return a.cmd.Execute()
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}
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func (a *App) serve(ctx context.Context, configPath string) error {
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ca, err := certauthority.New(pkix.Name{CommonName: "Placeholder CA"})
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if err != nil {
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return fmt.Errorf("could not initialize CA: %w", err)
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}
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caBundle, err := ca.Bundle()
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if err != nil {
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return fmt.Errorf("could not read CA bundle: %w", err)
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}
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log.Printf("initialized CA bundle:\n%s", string(caBundle))
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cert, err := ca.Issue(
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pkix.Name{CommonName: "Placeholder Server"},
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[]string{"placeholder-serve"},
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24*365*time.Hour,
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)
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if err != nil {
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return fmt.Errorf("could not issue serving certificate: %w", err)
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}
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// Start an errgroup to manage the lifetimes of the various listener goroutines.
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eg, ctx := errgroup.WithContext(ctx)
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// Start healthz listener
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eg.Go(func() error {
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log.Printf("Starting healthz serve on %v", a.healthAddr)
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server := http.Server{
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BaseContext: func(_ net.Listener) context.Context { return ctx },
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Addr: a.healthAddr,
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Handler: handlers.New(),
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}
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return runGracefully(ctx, &server, eg)
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})
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// Start main service listener
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eg.Go(func() error {
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log.Printf("Starting main serve on %v", a.mainAddr)
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server := http.Server{
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BaseContext: func(_ net.Listener) context.Context { return ctx },
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Addr: a.mainAddr,
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TLSConfig: &tls.Config{
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MinVersion: tls.VersionTLS12,
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Certificates: []tls.Certificate{*cert},
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},
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Handler: http.HandlerFunc(exampleHandler),
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}
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return runGracefully(ctx, &server, eg)
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})
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if err := eg.Wait(); !errors.Is(err, http.ErrServerClosed) {
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return err
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}
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return nil
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}
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// exampleHandler is a stub to be replaced with our real server logic.
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func exampleHandler(w http.ResponseWriter, r *http.Request) {
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_, _ = w.Write([]byte("Hello world"))
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}
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// runGracefully runs an http.Server with graceful shutdown.
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func runGracefully(ctx context.Context, srv *http.Server, eg *errgroup.Group) error {
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// Start the listener in a child goroutine.
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eg.Go(srv.ListenAndServe)
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// If/when the context is canceled or times out, initiate shutting down the serve.
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<-ctx.Done()
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shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownGracePeriod)
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defer cancel()
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return srv.Shutdown(shutdownCtx)
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}
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@ -7,9 +7,11 @@ package app
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import (
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"bytes"
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"context"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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const knownGoodUsage = `Usage:
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@ -54,17 +56,18 @@ func TestCommand(t *testing.T) {
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},
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},
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}
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for _, theTest := range tests {
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test := theTest // please the linter :'(
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for _, test := range tests {
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test := test
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t.Run(test.name, func(t *testing.T) {
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expect := assert.New(t)
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expect := require.New(t)
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stdout := bytes.NewBuffer([]byte{})
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stderr := bytes.NewBuffer([]byte{})
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configPaths := make([]string, 0, 1)
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runFunc := func(configPath string) {
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runFunc := func(ctx context.Context, configPath string) error {
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configPaths = append(configPaths, configPath)
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return nil
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}
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a := New(test.args, stdout, stderr)
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@ -72,9 +75,8 @@ func TestCommand(t *testing.T) {
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err := a.Run()
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if test.wantConfigPath != "" {
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if expect.Equal(1, len(configPaths)) {
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expect.Equal(1, len(configPaths))
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expect.Equal(test.wantConfigPath, configPaths[0])
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}
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} else {
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expect.Error(err)
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expect.Contains(stdout.String(), knownGoodUsage)
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@ -82,3 +84,33 @@ func TestCommand(t *testing.T) {
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})
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}
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}
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func TestServeApp(t *testing.T) {
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t.Parallel()
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t.Run("success", func(t *testing.T) {
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t.Parallel()
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ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
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cancel()
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a := App{
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healthAddr: "127.0.0.1:0",
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mainAddr: "127.0.0.1:8443",
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}
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err := a.serve(ctx, "some/path/to/config.yaml")
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require.NoError(t, err)
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})
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t.Run("failure", func(t *testing.T) {
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t.Parallel()
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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a := App{
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healthAddr: "127.0.0.1:8081",
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mainAddr: "127.0.0.1:8081",
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}
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err := a.serve(ctx, "some/path/to/config.yaml")
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require.EqualError(t, err, "listen tcp 127.0.0.1:8081: bind: address already in use")
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})
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}
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1
go.mod
1
go.mod
@ -7,6 +7,7 @@ require (
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github.com/golangci/golangci-lint v1.28.1
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github.com/spf13/cobra v1.0.0
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github.com/stretchr/testify v1.6.1
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golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
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golang.org/x/tools v0.0.0-20200707134715-9e0a013e855f // indirect
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k8s.io/api v0.18.5
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k8s.io/apimachinery v0.18.5
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172
internal/certauthority/certauthority.go
Normal file
172
internal/certauthority/certauthority.go
Normal file
@ -0,0 +1,172 @@
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/*
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Copyright 2020 VMware, Inc.
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SPDX-License-Identifier: Apache-2.0
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*/
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// Package certauthority implements a simple x509 certificate authority suitable for use in an aggregated API service.
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package certauthority
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import (
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"bytes"
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"crypto"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"fmt"
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"io"
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"math/big"
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"time"
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)
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// CA holds the state for a simple x509 certificate authority suitable for use in an aggregated API service.
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type CA struct {
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// secure random number generators for various steps (usually crypto/rand.Reader, but broken out here for tests).
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serialRNG io.Reader
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keygenRNG io.Reader
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signingRNG io.Reader
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// clock tells the current time (usually time.Now(), but broken out here for tests).
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clock func() time.Time
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// signer is the private key for the current CA.
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signer crypto.Signer
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// caCert is the DER-encoded certificate for the current CA.
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caCertBytes []byte
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}
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// Option to pass when calling New.
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type Option func(*CA) error
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func New(subject pkix.Name, opts ...Option) (*CA, error) {
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// Initialize the result by starting with some defaults and applying any provided options.
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ca := CA{
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serialRNG: rand.Reader,
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keygenRNG: rand.Reader,
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signingRNG: rand.Reader,
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clock: time.Now,
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}
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for _, opt := range opts {
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if err := opt(&ca); err != nil {
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return nil, err
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}
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}
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// Generate a random serial for the CA
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serialNumber, err := randomSerial(ca.serialRNG)
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if err != nil {
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return nil, fmt.Errorf("could not generate CA serial: %w", err)
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}
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// Generate a new P256 keypair.
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privateKey, err := ecdsa.GenerateKey(elliptic.P256(), ca.keygenRNG)
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if err != nil {
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return nil, fmt.Errorf("could not generate CA private key: %w", err)
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}
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ca.signer = privateKey
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// Make a CA certificate valid for 100 years and backdated by one minute.
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now := ca.clock()
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notBefore := now.Add(-1 * time.Minute)
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notAfter := now.Add(24 * time.Hour * 365 * 100)
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// Create CA cert template
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caTemplate := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: subject,
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NotBefore: notBefore,
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NotAfter: notAfter,
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IsCA: true,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
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KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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BasicConstraintsValid: true,
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}
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// Self-sign the CA to get the DER certificate.
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caCertBytes, err := x509.CreateCertificate(ca.signingRNG, &caTemplate, &caTemplate, &privateKey.PublicKey, privateKey)
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if err != nil {
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return nil, fmt.Errorf("could not issue CA certificate: %w", err)
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}
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ca.caCertBytes = caCertBytes
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return &ca, nil
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}
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// WriteBundle writes the current CA signing bundle in concatenated PEM format.
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func (c *CA) WriteBundle(out io.Writer) error {
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if err := pem.Encode(out, &pem.Block{Type: "CERTIFICATE", Bytes: c.caCertBytes}); err != nil {
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return fmt.Errorf("could not encode CA certificate to PEM: %w", err)
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}
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return nil
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}
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// Bundle returns the current CA signing bundle in concatenated PEM format.
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func (c *CA) Bundle() ([]byte, error) {
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var out bytes.Buffer
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err := c.WriteBundle(&out)
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return out.Bytes(), err
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}
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// Issue a new server certificate for the given identity and duration.
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func (c *CA) Issue(subject pkix.Name, dnsNames []string, ttl time.Duration) (*tls.Certificate, error) {
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// Choose a random 128 bit serial number.
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serialNumber, err := randomSerial(c.serialRNG)
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if err != nil {
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return nil, fmt.Errorf("could not generate serial number for certificate: %w", err)
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}
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// Generate a new P256 keypair.
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privateKey, err := ecdsa.GenerateKey(elliptic.P256(), c.keygenRNG)
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if err != nil {
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return nil, fmt.Errorf("could not generate private key: %w", err)
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}
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// Make a CA caCert valid for the requested TTL and backdated by one minute.
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now := c.clock()
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notBefore := now.Add(-1 * time.Minute)
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notAfter := now.Add(ttl)
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// Parse the DER encoded certificate to get an x509.Certificate.
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caCert, err := x509.ParseCertificate(c.caCertBytes)
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if err != nil {
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return nil, fmt.Errorf("could not parse CA certificate: %w", err)
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}
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// Sign a cert, getting back the DER-encoded certificate bytes.
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: subject,
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
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BasicConstraintsValid: true,
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IsCA: false,
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DNSNames: dnsNames,
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}
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certBytes, err := x509.CreateCertificate(rand.Reader, &template, caCert, &privateKey.PublicKey, c.signer)
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if err != nil {
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return nil, fmt.Errorf("could not sign certificate: %w", err)
|
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}
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// Parse the DER encoded certificate back out into an *x509.Certificate.
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newCert, err := x509.ParseCertificate(certBytes)
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if err != nil {
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return nil, fmt.Errorf("could not parse certificate: %w", err)
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}
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|
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// Return the new certificate.
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return &tls.Certificate{
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Certificate: [][]byte{certBytes},
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Leaf: newCert,
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PrivateKey: privateKey,
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}, nil
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}
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|
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// randomSerial generates a random 128 bit serial number.
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func randomSerial(rng io.Reader) (*big.Int, error) {
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return rand.Int(rng, new(big.Int).Lsh(big.NewInt(1), 128))
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}
|
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220
internal/certauthority/certauthority_test.go
Normal file
220
internal/certauthority/certauthority_test.go
Normal file
@ -0,0 +1,220 @@
|
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/*
|
||||
Copyright 2020 VMware, Inc.
|
||||
SPDX-License-Identifier: Apache-2.0
|
||||
*/
|
||||
|
||||
package certauthority
|
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|
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import (
|
||||
"bytes"
|
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"crypto"
|
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"crypto/x509"
|
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"crypto/x509/pkix"
|
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"fmt"
|
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"io"
|
||||
"strings"
|
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"testing"
|
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"time"
|
||||
|
||||
"github.com/stretchr/testify/require"
|
||||
)
|
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|
||||
func TestNew(t *testing.T) {
|
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now := time.Date(2020, 7, 10, 12, 41, 12, 1234, time.UTC)
|
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|
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tests := []struct {
|
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name string
|
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opts []Option
|
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wantErr string
|
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}{
|
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{
|
||||
name: "error option",
|
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opts: []Option{func(ca *CA) error {
|
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return fmt.Errorf("some error")
|
||||
}},
|
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wantErr: "some error",
|
||||
},
|
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{
|
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name: "failed to generate CA serial",
|
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opts: []Option{func(ca *CA) error {
|
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ca.serialRNG = strings.NewReader("")
|
||||
ca.keygenRNG = strings.NewReader("")
|
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ca.signingRNG = strings.NewReader("")
|
||||
return nil
|
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}},
|
||||
wantErr: "could not generate CA serial: EOF",
|
||||
},
|
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{
|
||||
name: "failed to generate CA key",
|
||||
opts: []Option{func(ca *CA) error {
|
||||
ca.serialRNG = strings.NewReader(strings.Repeat("x", 64))
|
||||
ca.keygenRNG = strings.NewReader("")
|
||||
return nil
|
||||
}},
|
||||
wantErr: "could not generate CA private key: EOF",
|
||||
},
|
||||
{
|
||||
name: "failed to self-sign",
|
||||
opts: []Option{func(ca *CA) error {
|
||||
ca.serialRNG = strings.NewReader(strings.Repeat("x", 64))
|
||||
ca.keygenRNG = strings.NewReader(strings.Repeat("y", 64))
|
||||
ca.signingRNG = strings.NewReader("")
|
||||
return nil
|
||||
}},
|
||||
wantErr: "could not issue CA certificate: EOF",
|
||||
},
|
||||
{
|
||||
name: "success",
|
||||
opts: []Option{func(ca *CA) error {
|
||||
ca.serialRNG = strings.NewReader(strings.Repeat("x", 64))
|
||||
ca.keygenRNG = strings.NewReader(strings.Repeat("y", 64))
|
||||
ca.signingRNG = strings.NewReader(strings.Repeat("z", 64))
|
||||
ca.clock = func() time.Time { return now }
|
||||
return nil
|
||||
}},
|
||||
},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
tt := tt
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
got, err := New(pkix.Name{CommonName: "Test CA"}, tt.opts...)
|
||||
if tt.wantErr != "" {
|
||||
require.EqualError(t, err, tt.wantErr)
|
||||
require.Nil(t, got)
|
||||
return
|
||||
}
|
||||
require.NoError(t, err)
|
||||
require.NotNil(t, got)
|
||||
|
||||
// Make sure the CA certificate looks roughly like what we expect.
|
||||
caCert, err := x509.ParseCertificate(got.caCertBytes)
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, "Test CA", caCert.Subject.CommonName)
|
||||
require.Equal(t, now.Add(100*365*24*time.Hour).Unix(), caCert.NotAfter.Unix())
|
||||
require.Equal(t, now.Add(-1*time.Minute).Unix(), caCert.NotBefore.Unix())
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
type errWriter struct {
|
||||
err error
|
||||
}
|
||||
|
||||
func (e *errWriter) Write(p []byte) (n int, err error) { return 0, e.err }
|
||||
|
||||
func TestWriteBundle(t *testing.T) {
|
||||
t.Run("error", func(t *testing.T) {
|
||||
ca := CA{}
|
||||
out := errWriter{fmt.Errorf("some error")}
|
||||
require.EqualError(t, ca.WriteBundle(&out), "could not encode CA certificate to PEM: some error")
|
||||
})
|
||||
|
||||
t.Run("empty", func(t *testing.T) {
|
||||
ca := CA{}
|
||||
var out bytes.Buffer
|
||||
require.NoError(t, ca.WriteBundle(&out))
|
||||
require.Equal(t, "-----BEGIN CERTIFICATE-----\n-----END CERTIFICATE-----\n", out.String())
|
||||
})
|
||||
|
||||
t.Run("success", func(t *testing.T) {
|
||||
ca := CA{caCertBytes: []byte{1, 2, 3, 4, 5, 6, 7, 8}}
|
||||
var out bytes.Buffer
|
||||
require.NoError(t, ca.WriteBundle(&out))
|
||||
require.Equal(t, "-----BEGIN CERTIFICATE-----\nAQIDBAUGBwg=\n-----END CERTIFICATE-----\n", out.String())
|
||||
})
|
||||
}
|
||||
|
||||
func TestBundle(t *testing.T) {
|
||||
t.Run("success", func(t *testing.T) {
|
||||
ca := CA{caCertBytes: []byte{1, 2, 3, 4, 5, 6, 7, 8}}
|
||||
got, err := ca.Bundle()
|
||||
require.NoError(t, err)
|
||||
require.Equal(t, "-----BEGIN CERTIFICATE-----\nAQIDBAUGBwg=\n-----END CERTIFICATE-----\n", string(got))
|
||||
})
|
||||
}
|
||||
|
||||
type errSigner struct {
|
||||
pubkey crypto.PublicKey
|
||||
err error
|
||||
}
|
||||
|
||||
func (e *errSigner) Public() crypto.PublicKey { return e.pubkey }
|
||||
|
||||
func (e *errSigner) Sign(_ io.Reader, _ []byte, _ crypto.SignerOpts) ([]byte, error) {
|
||||
return nil, e.err
|
||||
}
|
||||
|
||||
func TestIssue(t *testing.T) {
|
||||
now := time.Date(2020, 7, 10, 12, 41, 12, 1234, time.UTC)
|
||||
|
||||
realCA, err := New(pkix.Name{CommonName: "Test CA"})
|
||||
require.NoError(t, err)
|
||||
|
||||
tests := []struct {
|
||||
name string
|
||||
ca CA
|
||||
wantErr string
|
||||
}{
|
||||
{
|
||||
name: "failed to generate serial",
|
||||
ca: CA{
|
||||
serialRNG: strings.NewReader(""),
|
||||
},
|
||||
wantErr: "could not generate serial number for certificate: EOF",
|
||||
},
|
||||
{
|
||||
name: "failed to generate keypair",
|
||||
ca: CA{
|
||||
serialRNG: strings.NewReader(strings.Repeat("x", 64)),
|
||||
keygenRNG: strings.NewReader(""),
|
||||
},
|
||||
wantErr: "could not generate private key: EOF",
|
||||
},
|
||||
{
|
||||
name: "invalid CA certificate",
|
||||
ca: CA{
|
||||
serialRNG: strings.NewReader(strings.Repeat("x", 64)),
|
||||
keygenRNG: strings.NewReader(strings.Repeat("x", 64)),
|
||||
clock: func() time.Time { return now },
|
||||
},
|
||||
wantErr: "could not parse CA certificate: asn1: syntax error: sequence truncated",
|
||||
},
|
||||
{
|
||||
name: "signing error",
|
||||
ca: CA{
|
||||
serialRNG: strings.NewReader(strings.Repeat("x", 64)),
|
||||
keygenRNG: strings.NewReader(strings.Repeat("x", 64)),
|
||||
clock: func() time.Time { return now },
|
||||
caCertBytes: realCA.caCertBytes,
|
||||
signer: &errSigner{
|
||||
pubkey: realCA.signer.Public(),
|
||||
err: fmt.Errorf("some signer error"),
|
||||
},
|
||||
},
|
||||
wantErr: "could not sign certificate: some signer error",
|
||||
},
|
||||
{
|
||||
name: "success",
|
||||
ca: CA{
|
||||
serialRNG: strings.NewReader(strings.Repeat("x", 64)),
|
||||
keygenRNG: strings.NewReader(strings.Repeat("x", 64)),
|
||||
clock: func() time.Time { return now },
|
||||
caCertBytes: realCA.caCertBytes,
|
||||
signer: realCA.signer,
|
||||
},
|
||||
},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
tt := tt
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
got, err := tt.ca.Issue(pkix.Name{CommonName: "Test Server"}, []string{"example.com"}, 10*time.Minute)
|
||||
if tt.wantErr != "" {
|
||||
require.EqualError(t, err, tt.wantErr)
|
||||
require.Nil(t, got)
|
||||
return
|
||||
}
|
||||
require.NoError(t, err)
|
||||
require.NotNil(t, got)
|
||||
})
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user