8fb5340dc9
Instead of using `step-ca login` we will use a new token provided as a flag to configure and start linkedca. Certificates will be kept in memory and refreshed automatically.
276 lines
7.1 KiB
Go
276 lines
7.1 KiB
Go
package commands
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import (
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"context"
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"crypto/sha256"
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"crypto/tls"
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"crypto/x509"
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"encoding/hex"
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"encoding/pem"
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"fmt"
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"io/ioutil"
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"net/url"
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"os"
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"path/filepath"
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"regexp"
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"strings"
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"time"
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"github.com/pkg/errors"
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"github.com/urfave/cli"
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"go.step.sm/cli-utils/command"
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"go.step.sm/cli-utils/config"
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"go.step.sm/cli-utils/errs"
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"go.step.sm/cli-utils/ui"
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"go.step.sm/crypto/jose"
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"go.step.sm/crypto/keyutil"
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"go.step.sm/crypto/pemutil"
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"go.step.sm/crypto/x509util"
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"go.step.sm/linkedca"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials"
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)
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const loginEndpoint = "linkedca.smallstep.com:443"
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const uuidPattern = "^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$"
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type linkedCAClaims struct {
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jose.Claims
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SANs []string `json:"sans"`
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SHA string `json:"sha"`
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}
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func init() {
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command.Register(cli.Command{
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Name: "login",
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Usage: "create the certificates to authorize your Linked CA instance",
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UsageText: `**step-ca login** **--token*=<token>
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[**--linkedca**=<endpoint>] [**--root**=<file>]`,
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Action: loginAction,
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Description: `**step-ca login** ...
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## POSITIONAL ARGUMENTS
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<authority>
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: The authority uuid provided by the web app.`,
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "token",
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Usage: "The <token> used to authenticate with the Linked CA in order to create the initial credentials",
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},
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},
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})
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}
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func loginAction(ctx *cli.Context) error {
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if err := errs.NumberOfArguments(ctx, 1); err != nil {
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return err
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}
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token := ctx.String("token")
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if token == "" {
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return errs.RequiredFlag(ctx, "token")
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}
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var claims linkedCAClaims
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tok, err := jose.ParseSigned(token)
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if err != nil {
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return errors.Wrap(err, "error parsing token")
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}
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if err := tok.UnsafeClaimsWithoutVerification(&claims); err != nil {
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return errors.Wrap(err, "error parsing token")
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}
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if len(claims.Audience) != 0 {
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return errors.Wrap(err, "error parsing token: invalid aud claim")
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}
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u, err := url.Parse(claims.Audience[0])
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if err != nil {
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return errors.Wrap(err, "error parsing token: invalid aud claim")
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}
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if claims.SHA == "" {
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return errors.Wrap(err, "error parsing token: invalid sha claim")
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}
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authority, err := getAuthority(claims.SANs)
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if err != nil {
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return err
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}
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// Get and verify root certificate
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root, err := getRootCertificate(u.Host, claims.SHA)
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if err != nil {
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return err
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}
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pool := x509.NewCertPool()
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pool.AddCert(root)
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gctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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conn, err := grpc.DialContext(gctx, u.Host, grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{
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RootCAs: pool,
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})))
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if err != nil {
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return errors.Wrapf(err, "error connecting %s", u.Host)
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}
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// Create csr
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signer, err := keyutil.GenerateDefaultSigner()
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if err != nil {
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return err
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}
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csr, err := x509util.CreateCertificateRequest(claims.Subject, claims.SANs, signer)
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if err != nil {
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return err
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}
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block, err := pemutil.Serialize(csr)
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if err != nil {
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return err
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}
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// Perform login and get signed certificate
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client := linkedca.NewMajordomoClient(conn)
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gctx, cancel = context.WithTimeout(context.Background(), 15*time.Second)
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defer cancel()
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resp, err := client.Login(gctx, &linkedca.LoginRequest{
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AuthorityId: authority,
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Token: token,
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PemCertificateRequest: string(pem.EncodeToMemory(block)),
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})
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if err != nil {
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return errors.Wrap(err, "error doing login")
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}
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certData, rootData, err := parseLoginResponse(resp)
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if err != nil {
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return err
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}
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block, err = pemutil.Serialize(signer, pemutil.WithPKCS8(true))
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if err != nil {
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return err
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}
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keyData := pem.EncodeToMemory(block)
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base := filepath.Join(config.StepPath(), "linkedca")
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if err := os.MkdirAll(base, 0700); err != nil {
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return errors.Wrap(err, "error creating linkedca directory")
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}
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rootFile := filepath.Join(base, "root_ca.crt")
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certFile := filepath.Join(base, "linkedca.crt")
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keyFile := filepath.Join(base, "linkedca.key")
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if err := ioutil.WriteFile(rootFile, []byte(rootData), 0600); err != nil {
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return errors.Wrap(err, "error writing file")
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}
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if err := ioutil.WriteFile(certFile, []byte(certData), 0600); err != nil {
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return errors.Wrap(err, "error writing file")
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}
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if err := ioutil.WriteFile(keyFile, []byte(keyData), 0600); err != nil {
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return errors.Wrap(err, "error writing file")
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}
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ui.PrintSelected("Certificate", certFile)
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ui.PrintSelected("Key", keyFile)
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ui.PrintSelected("Root", rootFile)
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return nil
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}
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func getAuthority(sans []string) (string, error) {
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for _, s := range sans {
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if strings.HasPrefix(s, "urn:smallstep:authority:") {
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if regexp.MustCompile(uuidPattern).MatchString(s[24:]) {
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return s[24:], nil
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}
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}
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}
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return "", fmt.Errorf("error parsing token: invalid sans claim")
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}
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func getRootCertificate(endpoint, fingerprint string) (*x509.Certificate, error) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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conn, err := grpc.DialContext(ctx, endpoint, grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{
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InsecureSkipVerify: true,
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})))
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if err != nil {
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return nil, errors.Wrapf(err, "error connecting %s", endpoint)
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}
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ctx, cancel = context.WithTimeout(context.Background(), 15*time.Second)
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defer cancel()
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client := linkedca.NewMajordomoClient(conn)
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resp, err := client.GetRootCertificate(ctx, &linkedca.GetRootCertificateRequest{
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Fingerprint: fingerprint,
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})
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if err != nil {
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return nil, fmt.Errorf("error getting root certificate: %w", err)
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}
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var block *pem.Block
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b := []byte(resp.PemCertificate)
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for len(b) > 0 {
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block, b = pem.Decode(b)
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if block == nil {
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break
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}
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if block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
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continue
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}
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cert, err := x509.ParseCertificate(block.Bytes)
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if err != nil {
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return nil, fmt.Errorf("error parsing certificate: %w", err)
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}
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// verify the sha256
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sum := sha256.Sum256(cert.Raw)
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if !strings.EqualFold(fingerprint, hex.EncodeToString(sum[:])) {
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return nil, fmt.Errorf("error verifying certificate: SHA256 fingerprint does not match")
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}
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return cert, nil
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}
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return nil, fmt.Errorf("error getting root certificate: certificate not found")
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}
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func parseLoginResponse(resp *linkedca.LoginResponse) ([]byte, []byte, error) {
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var block *pem.Block
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var bundle []*x509.Certificate
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b := []byte(resp.PemCertificateChain)
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for len(b) > 0 {
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block, b = pem.Decode(b)
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if block == nil {
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break
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}
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if block.Type != "CERTIFICATE" {
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return nil, nil, errors.New("error decoding login response: pemCertificateChain is not a certificate bundle")
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}
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crt, err := x509.ParseCertificate(block.Bytes)
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if err != nil {
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return nil, nil, errors.Wrap(err, "error parsing login response")
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}
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bundle = append(bundle, crt)
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}
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if len(bundle) == 0 {
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return nil, nil, errors.New("error decoding login response: pemCertificateChain should not be empty")
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}
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last := len(bundle) - 1
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certBytes := []byte(resp.PemCertificate)
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for i := 0; i < last; i++ {
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certBytes = append(certBytes, pem.EncodeToMemory(&pem.Block{
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Type: "CERTIFICATE",
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Bytes: bundle[i].Raw,
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})...)
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}
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return certBytes, pem.EncodeToMemory(&pem.Block{
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Type: "CERTIFICATE",
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Bytes: bundle[last].Raw,
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}), nil
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}
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