249 lines
10 KiB
Go
249 lines
10 KiB
Go
package authority
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import (
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"context"
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"crypto/sha256"
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"crypto/x509"
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"encoding/hex"
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"net/http"
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"strings"
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"github.com/smallstep/certificates/authority/provisioner"
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"github.com/smallstep/certificates/errs"
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"go.step.sm/crypto/jose"
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"golang.org/x/crypto/ssh"
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)
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// Claims extends jose.Claims with step attributes.
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type Claims struct {
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jose.Claims
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SANs []string `json:"sans,omitempty"`
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Email string `json:"email,omitempty"`
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Nonce string `json:"nonce,omitempty"`
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}
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type skipTokenReuseKey struct{}
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// NewContextWithSkipTokenReuse creates a new context from ctx and attaches a
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// value to skip the token reuse.
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func NewContextWithSkipTokenReuse(ctx context.Context) context.Context {
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return context.WithValue(ctx, skipTokenReuseKey{}, true)
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}
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// SkipTokenReuseFromContext returns if the token reuse needs to be ignored.
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func SkipTokenReuseFromContext(ctx context.Context) bool {
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m, _ := ctx.Value(skipTokenReuseKey{}).(bool)
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return m
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}
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// authorizeToken parses the token and returns the provisioner used to generate
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// the token. This method enforces the One-Time use policy (tokens can only be
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// used once).
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func (a *Authority) authorizeToken(ctx context.Context, token string) (provisioner.Interface, error) {
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// Validate payload
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tok, err := jose.ParseSigned(token)
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if err != nil {
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return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.authorizeToken: error parsing token")
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}
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// Get claims w/out verification. We need to look up the provisioner
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// key in order to verify the claims and we need the issuer from the claims
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// before we can look up the provisioner.
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var claims Claims
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if err = tok.UnsafeClaimsWithoutVerification(&claims); err != nil {
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return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.authorizeToken")
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}
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// TODO: use new persistence layer abstraction.
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// Do not accept tokens issued before the start of the ca.
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// This check is meant as a stopgap solution to the current lack of a persistence layer.
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if a.config.AuthorityConfig != nil && !a.config.AuthorityConfig.DisableIssuedAtCheck {
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if claims.IssuedAt != nil && claims.IssuedAt.Time().Before(a.startTime) {
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return nil, errs.Unauthorized("authority.authorizeToken: token issued before the bootstrap of certificate authority")
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}
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}
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// This method will also validate the audiences for JWK provisioners.
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p, ok := a.provisioners.LoadByToken(tok, &claims.Claims)
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if !ok {
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return nil, errs.Unauthorized("authority.authorizeToken: provisioner "+
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"not found or invalid audience (%s)", strings.Join(claims.Audience, ", "))
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}
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// Store the token to protect against reuse unless it's skipped.
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// If we cannot get a token id from the provisioner, just hash the token.
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if !SkipTokenReuseFromContext(ctx) {
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if reuseKey, err := p.GetTokenID(token); err == nil {
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if reuseKey == "" {
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sum := sha256.Sum256([]byte(token))
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reuseKey = strings.ToLower(hex.EncodeToString(sum[:]))
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}
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ok, err := a.db.UseToken(reuseKey, token)
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if err != nil {
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return nil, errs.Wrap(http.StatusInternalServerError, err,
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"authority.authorizeToken: failed when attempting to store token")
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}
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if !ok {
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return nil, errs.Unauthorized("authority.authorizeToken: token already used")
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}
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}
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}
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return p, nil
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}
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// Authorize grabs the method from the context and authorizes the request by
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// validating the one-time-token.
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func (a *Authority) Authorize(ctx context.Context, token string) ([]provisioner.SignOption, error) {
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var opts = []interface{}{errs.WithKeyVal("token", token)}
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switch m := provisioner.MethodFromContext(ctx); m {
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case provisioner.SignMethod:
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signOpts, err := a.authorizeSign(ctx, token)
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return signOpts, errs.Wrap(http.StatusInternalServerError, err, "authority.Authorize", opts...)
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case provisioner.RevokeMethod:
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return nil, errs.Wrap(http.StatusInternalServerError, a.authorizeRevoke(ctx, token), "authority.Authorize", opts...)
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case provisioner.SSHSignMethod:
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if a.sshCAHostCertSignKey == nil && a.sshCAUserCertSignKey == nil {
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return nil, errs.NotImplemented("authority.Authorize; ssh certificate flows are not enabled", opts...)
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}
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signOpts, err := a.authorizeSSHSign(ctx, token)
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return signOpts, errs.Wrap(http.StatusInternalServerError, err, "authority.Authorize", opts...)
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case provisioner.SSHRenewMethod:
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if a.sshCAHostCertSignKey == nil && a.sshCAUserCertSignKey == nil {
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return nil, errs.NotImplemented("authority.Authorize; ssh certificate flows are not enabled", opts...)
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}
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_, err := a.authorizeSSHRenew(ctx, token)
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.Authorize", opts...)
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case provisioner.SSHRevokeMethod:
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return nil, errs.Wrap(http.StatusInternalServerError, a.authorizeSSHRevoke(ctx, token), "authority.Authorize", opts...)
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case provisioner.SSHRekeyMethod:
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if a.sshCAHostCertSignKey == nil && a.sshCAUserCertSignKey == nil {
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return nil, errs.NotImplemented("authority.Authorize; ssh certificate flows are not enabled", opts...)
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}
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_, signOpts, err := a.authorizeSSHRekey(ctx, token)
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return signOpts, errs.Wrap(http.StatusInternalServerError, err, "authority.Authorize", opts...)
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default:
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return nil, errs.InternalServer("authority.Authorize; method %d is not supported", append([]interface{}{m}, opts...)...)
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}
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}
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// authorizeSign loads the provisioner from the token and calls the provisioner
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// AuthorizeSign method. Returns a list of methods to apply to the signing flow.
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func (a *Authority) authorizeSign(ctx context.Context, token string) ([]provisioner.SignOption, error) {
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p, err := a.authorizeToken(ctx, token)
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if err != nil {
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeSign")
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}
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signOpts, err := p.AuthorizeSign(ctx, token)
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if err != nil {
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeSign")
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}
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return signOpts, nil
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}
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// AuthorizeSign authorizes a signature request by validating and authenticating
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// a token that must be sent w/ the request.
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//
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// NOTE: This method is deprecated and should not be used. We make it available
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// in the short term os as not to break existing clients.
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func (a *Authority) AuthorizeSign(token string) ([]provisioner.SignOption, error) {
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ctx := provisioner.NewContextWithMethod(context.Background(), provisioner.SignMethod)
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return a.Authorize(ctx, token)
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}
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// authorizeRevoke locates the provisioner used to generate the authenticating
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// token and then performs the token validation flow.
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func (a *Authority) authorizeRevoke(ctx context.Context, token string) error {
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p, err := a.authorizeToken(ctx, token)
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if err != nil {
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return errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeRevoke")
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}
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if err = p.AuthorizeRevoke(ctx, token); err != nil {
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return errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeRevoke")
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}
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return nil
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}
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// authorizeRenew locates the provisioner (using the provisioner extension in the cert), and checks
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// if for the configured provisioner, the renewal is enabled or not. If the
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// extra extension cannot be found, authorize the renewal by default.
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//
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// TODO(mariano): should we authorize by default?
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func (a *Authority) authorizeRenew(cert *x509.Certificate) error {
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var opts = []interface{}{errs.WithKeyVal("serialNumber", cert.SerialNumber.String())}
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// Check the passive revocation table.
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isRevoked, err := a.db.IsRevoked(cert.SerialNumber.String())
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if err != nil {
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return errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeRenew", opts...)
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}
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if isRevoked {
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return errs.Unauthorized("authority.authorizeRenew: certificate has been revoked", opts...)
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}
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p, ok := a.provisioners.LoadByCertificate(cert)
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if !ok {
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return errs.Unauthorized("authority.authorizeRenew: provisioner not found", opts...)
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}
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if err := p.AuthorizeRenew(context.Background(), cert); err != nil {
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return errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeRenew", opts...)
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}
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return nil
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}
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// authorizeSSHSign loads the provisioner from the token, checks that it has not
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// been used again and calls the provisioner AuthorizeSSHSign method. Returns a
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// list of methods to apply to the signing flow.
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func (a *Authority) authorizeSSHSign(ctx context.Context, token string) ([]provisioner.SignOption, error) {
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p, err := a.authorizeToken(ctx, token)
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if err != nil {
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return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.authorizeSSHSign")
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}
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signOpts, err := p.AuthorizeSSHSign(ctx, token)
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if err != nil {
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return nil, errs.Wrap(http.StatusUnauthorized, err, "authority.authorizeSSHSign")
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}
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return signOpts, nil
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}
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// authorizeSSHRenew authorizes an SSH certificate renewal request, by
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// validating the contents of an SSHPOP token.
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func (a *Authority) authorizeSSHRenew(ctx context.Context, token string) (*ssh.Certificate, error) {
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p, err := a.authorizeToken(ctx, token)
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if err != nil {
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeSSHRenew")
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}
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cert, err := p.AuthorizeSSHRenew(ctx, token)
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if err != nil {
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return nil, errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeSSHRenew")
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}
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return cert, nil
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}
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// authorizeSSHRekey authorizes an SSH certificate rekey request, by
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// validating the contents of an SSHPOP token.
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func (a *Authority) authorizeSSHRekey(ctx context.Context, token string) (*ssh.Certificate, []provisioner.SignOption, error) {
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p, err := a.authorizeToken(ctx, token)
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if err != nil {
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return nil, nil, errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeSSHRekey")
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}
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cert, signOpts, err := p.AuthorizeSSHRekey(ctx, token)
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if err != nil {
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return nil, nil, errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeSSHRekey")
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}
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return cert, signOpts, nil
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}
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// authorizeSSHRevoke authorizes an SSH certificate revoke request, by
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// validating the contents of an SSHPOP token.
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func (a *Authority) authorizeSSHRevoke(ctx context.Context, token string) error {
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p, err := a.authorizeToken(ctx, token)
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if err != nil {
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return errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeSSHRevoke")
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}
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if err = p.AuthorizeSSHRevoke(ctx, token); err != nil {
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return errs.Wrap(http.StatusInternalServerError, err, "authority.authorizeSSHRevoke")
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}
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return nil
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}
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