236 lines
7.4 KiB
Go
236 lines
7.4 KiB
Go
package provisioner
|
|
|
|
import (
|
|
"context"
|
|
"crypto/x509"
|
|
"time"
|
|
|
|
"github.com/pkg/errors"
|
|
"github.com/smallstep/cli/crypto/x509util"
|
|
"github.com/smallstep/cli/jose"
|
|
)
|
|
|
|
// jwtPayload extends jwt.Claims with step attributes.
|
|
type jwtPayload struct {
|
|
jose.Claims
|
|
SANs []string `json:"sans,omitempty"`
|
|
Step *stepPayload `json:"step,omitempty"`
|
|
}
|
|
|
|
type stepPayload struct {
|
|
SSH *SSHOptions `json:"ssh,omitempty"`
|
|
}
|
|
|
|
// JWK is the default provisioner, an entity that can sign tokens necessary for
|
|
// signature requests.
|
|
type JWK struct {
|
|
*base
|
|
Type string `json:"type"`
|
|
Name string `json:"name"`
|
|
Key *jose.JSONWebKey `json:"key"`
|
|
EncryptedKey string `json:"encryptedKey,omitempty"`
|
|
Claims *Claims `json:"claims,omitempty"`
|
|
claimer *Claimer
|
|
audiences Audiences
|
|
}
|
|
|
|
// GetID returns the provisioner unique identifier. The name and credential id
|
|
// should uniquely identify any JWK provisioner.
|
|
func (p *JWK) GetID() string {
|
|
return p.Name + ":" + p.Key.KeyID
|
|
}
|
|
|
|
// GetTokenID returns the identifier of the token.
|
|
func (p *JWK) GetTokenID(ott string) (string, error) {
|
|
// Validate payload
|
|
token, err := jose.ParseSigned(ott)
|
|
if err != nil {
|
|
return "", errors.Wrap(err, "error parsing token")
|
|
}
|
|
|
|
// Get claims w/out verification. We need to look up the provisioner
|
|
// key in order to verify the claims and we need the issuer from the claims
|
|
// before we can look up the provisioner.
|
|
var claims jose.Claims
|
|
if err = token.UnsafeClaimsWithoutVerification(&claims); err != nil {
|
|
return "", errors.Wrap(err, "error verifying claims")
|
|
}
|
|
return claims.ID, nil
|
|
}
|
|
|
|
// GetName returns the name of the provisioner.
|
|
func (p *JWK) GetName() string {
|
|
return p.Name
|
|
}
|
|
|
|
// GetType returns the type of provisioner.
|
|
func (p *JWK) GetType() Type {
|
|
return TypeJWK
|
|
}
|
|
|
|
// GetEncryptedKey returns the base provisioner encrypted key if it's defined.
|
|
func (p *JWK) GetEncryptedKey() (string, string, bool) {
|
|
return p.Key.KeyID, p.EncryptedKey, len(p.EncryptedKey) > 0
|
|
}
|
|
|
|
// Init initializes and validates the fields of a JWK type.
|
|
func (p *JWK) Init(config Config) (err error) {
|
|
switch {
|
|
case p.Type == "":
|
|
return errors.New("provisioner type cannot be empty")
|
|
case p.Name == "":
|
|
return errors.New("provisioner name cannot be empty")
|
|
case p.Key == nil:
|
|
return errors.New("provisioner key cannot be empty")
|
|
}
|
|
|
|
// Update claims with global ones
|
|
if p.claimer, err = NewClaimer(p.Claims, config.Claims); err != nil {
|
|
return err
|
|
}
|
|
|
|
p.audiences = config.Audiences
|
|
return err
|
|
}
|
|
|
|
// authorizeToken performs common jwt authorization actions and returns the
|
|
// claims for case specific downstream parsing.
|
|
// e.g. a Sign request will auth/validate different fields than a Revoke request.
|
|
func (p *JWK) authorizeToken(token string, audiences []string) (*jwtPayload, error) {
|
|
jwt, err := jose.ParseSigned(token)
|
|
if err != nil {
|
|
return nil, errors.Wrapf(err, "error parsing token")
|
|
}
|
|
|
|
var claims jwtPayload
|
|
if err = jwt.Claims(p.Key, &claims); err != nil {
|
|
return nil, errors.Wrap(err, "error parsing claims")
|
|
}
|
|
|
|
// According to "rfc7519 JSON Web Token" acceptable skew should be no
|
|
// more than a few minutes.
|
|
if err = claims.ValidateWithLeeway(jose.Expected{
|
|
Issuer: p.Name,
|
|
Time: time.Now().UTC(),
|
|
}, time.Minute); err != nil {
|
|
return nil, errors.Wrapf(err, "invalid token")
|
|
}
|
|
|
|
// validate audiences with the defaults
|
|
if !matchesAudience(claims.Audience, audiences) {
|
|
return nil, errors.New("invalid token: invalid audience claim (aud)")
|
|
}
|
|
|
|
if claims.Subject == "" {
|
|
return nil, errors.New("token subject cannot be empty")
|
|
}
|
|
|
|
return &claims, nil
|
|
}
|
|
|
|
// AuthorizeRevoke returns an error if the provisioner does not have rights to
|
|
// revoke the certificate with serial number in the `sub` property.
|
|
func (p *JWK) AuthorizeRevoke(ctx context.Context, token string) error {
|
|
_, err := p.authorizeToken(token, p.audiences.Revoke)
|
|
return err
|
|
}
|
|
|
|
// AuthorizeSign validates the given token.
|
|
func (p *JWK) AuthorizeSign(ctx context.Context, token string) ([]SignOption, error) {
|
|
claims, err := p.authorizeToken(token, p.audiences.Sign)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// NOTE: This is for backwards compatibility with older versions of cli
|
|
// and certificates. Older versions added the token subject as the only SAN
|
|
// in a CSR by default.
|
|
if len(claims.SANs) == 0 {
|
|
claims.SANs = []string{claims.Subject}
|
|
}
|
|
|
|
dnsNames, ips, emails := x509util.SplitSANs(claims.SANs)
|
|
return []SignOption{
|
|
// modifiers / withOptions
|
|
newProvisionerExtensionOption(TypeJWK, p.Name, p.Key.KeyID),
|
|
profileDefaultDuration(p.claimer.DefaultTLSCertDuration()),
|
|
// validators
|
|
commonNameValidator(claims.Subject),
|
|
defaultPublicKeyValidator{},
|
|
dnsNamesValidator(dnsNames),
|
|
emailAddressesValidator(emails),
|
|
ipAddressesValidator(ips),
|
|
newValidityValidator(p.claimer.MinTLSCertDuration(), p.claimer.MaxTLSCertDuration()),
|
|
}, nil
|
|
}
|
|
|
|
// AuthorizeRenew returns an error if the renewal is disabled.
|
|
// NOTE: This method does not actually validate the certificate or check it's
|
|
// revocation status. Just confirms that the provisioner that created the
|
|
// certificate was configured to allow renewals.
|
|
func (p *JWK) AuthorizeRenew(ctx context.Context, cert *x509.Certificate) error {
|
|
if p.claimer.IsDisableRenewal() {
|
|
return errors.Errorf("renew is disabled for provisioner %s", p.GetID())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// AuthorizeSSHSign returns the list of SignOption for a SignSSH request.
|
|
func (p *JWK) AuthorizeSSHSign(ctx context.Context, token string) ([]SignOption, error) {
|
|
if !p.claimer.IsSSHCAEnabled() {
|
|
return nil, errors.Errorf("ssh ca is disabled for provisioner %s", p.GetID())
|
|
}
|
|
// TODO: fix audiences
|
|
claims, err := p.authorizeToken(token, p.audiences.Sign)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if claims.Step == nil || claims.Step.SSH == nil {
|
|
return nil, errors.New("authorization token must be an SSH provisioning token")
|
|
}
|
|
opts := claims.Step.SSH
|
|
signOptions := []SignOption{
|
|
// validates user's SSHOptions with the ones in the token
|
|
sshCertificateOptionsValidator(*opts),
|
|
// set the key id to the token subject
|
|
sshCertificateKeyIDModifier(claims.Subject),
|
|
}
|
|
|
|
t := now()
|
|
// Add modifiers from custom claims
|
|
if opts.CertType != "" {
|
|
signOptions = append(signOptions, sshCertificateCertTypeModifier(opts.CertType))
|
|
}
|
|
if len(opts.Principals) > 0 {
|
|
signOptions = append(signOptions, sshCertificatePrincipalsModifier(opts.Principals))
|
|
}
|
|
if !opts.ValidAfter.IsZero() {
|
|
signOptions = append(signOptions, sshCertificateValidAfterModifier(opts.ValidAfter.RelativeTime(t).Unix()))
|
|
}
|
|
if !opts.ValidBefore.IsZero() {
|
|
signOptions = append(signOptions, sshCertificateValidBeforeModifier(opts.ValidBefore.RelativeTime(t).Unix()))
|
|
}
|
|
|
|
// Default to a user certificate with no principals if not set
|
|
signOptions = append(signOptions, sshCertificateDefaultsModifier{CertType: SSHUserCert})
|
|
|
|
return append(signOptions,
|
|
// Set the default extensions.
|
|
&sshDefaultExtensionModifier{},
|
|
// Set the validity bounds if not set.
|
|
sshDefaultValidityModifier(p.claimer),
|
|
// Validate public key
|
|
&sshDefaultPublicKeyValidator{},
|
|
// Validate the validity period.
|
|
&sshCertificateValidityValidator{p.claimer},
|
|
// Require and validate all the default fields in the SSH certificate.
|
|
&sshCertificateDefaultValidator{},
|
|
), nil
|
|
}
|
|
|
|
// AuthorizeSSHRevoke returns nil if the token is valid, false otherwise.
|
|
func (p *JWK) AuthorizeSSHRevoke(ctx context.Context, token string) error {
|
|
// TODO fix audience.
|
|
_, err := p.authorizeToken(token, p.audiences.SSHRevoke)
|
|
return err
|
|
}
|