certificates/authority/authorize.go

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package authority
import (
"crypto/x509"
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"net/http"
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"strings"
"time"
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"github.com/pkg/errors"
"github.com/smallstep/certificates/authority/provisioner"
"github.com/smallstep/cli/jose"
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)
type idUsed struct {
UsedAt int64 `json:"ua,omitempty"`
Subject string `json:"sub,omitempty"`
}
// Claims extends jose.Claims with step attributes.
type Claims struct {
jose.Claims
SANs []string `json:"sans,omitempty"`
Email string `json:"email,omitempty"`
Nonce string `json:"nonce,omitempty"`
}
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// Authorize authorizes a signature request by validating and authenticating
// a OTT that must be sent w/ the request.
func (a *Authority) Authorize(ott string) ([]provisioner.SignOption, error) {
var errContext = map[string]interface{}{"ott": ott}
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// Validate payload
token, err := jose.ParseSigned(ott)
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if err != nil {
return nil, &apiError{errors.Wrapf(err, "authorize: error parsing token"),
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http.StatusUnauthorized, errContext}
}
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// 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 Claims
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if err = token.UnsafeClaimsWithoutVerification(&claims); err != nil {
return nil, &apiError{err, http.StatusUnauthorized, errContext}
}
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// Do not accept tokens issued before the start of the ca.
// This check is meant as a stopgap solution to the current lack of a persistence layer.
if a.config.AuthorityConfig != nil && !a.config.AuthorityConfig.DisableIssuedAtCheck {
if claims.IssuedAt > 0 && claims.IssuedAt.Time().Before(a.startTime) {
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return nil, &apiError{errors.New("authorize: token issued before the bootstrap of certificate authority"),
http.StatusUnauthorized, errContext}
}
}
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// This method will also validate the audiences for JWK provisioners.
p, ok := a.provisioners.LoadByToken(token, &claims.Claims)
if !ok {
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return nil, &apiError{
errors.Errorf("authorize: provisioner not found or invalid audience (%s)", strings.Join(claims.Audience, ", ")),
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http.StatusUnauthorized, errContext}
}
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// Store the token to protect against reuse.
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var reuseKey string
switch p.GetType() {
case provisioner.TypeJWK:
reuseKey = claims.ID
case provisioner.TypeOIDC:
reuseKey = claims.Nonce
}
if reuseKey != "" {
if _, ok := a.ottMap.LoadOrStore(reuseKey, &idUsed{
UsedAt: time.Now().Unix(),
Subject: claims.Subject,
}); ok {
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return nil, &apiError{errors.Errorf("authorize: token already used"), http.StatusUnauthorized, errContext}
}
}
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// Call the provisioner Authorize method to get the signing options
opts, err := p.Authorize(ott)
if err != nil {
return nil, &apiError{errors.Wrap(err, "authorize"), http.StatusUnauthorized, errContext}
}
return opts, nil
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}
// authorizeRenewal tries to locate the step provisioner extension, and checks
// if for the configured provisioner, the renewal is enabled or not. If the
// extra extension cannot be found, authorize the renewal by default.
//
// TODO(mariano): should we authorize by default?
func (a *Authority) authorizeRenewal(crt *x509.Certificate) error {
errContext := map[string]interface{}{"serialNumber": crt.SerialNumber.String()}
p, ok := a.provisioners.LoadByCertificate(crt)
if !ok {
return &apiError{
err: errors.New("provisioner not found"),
code: http.StatusUnauthorized,
context: errContext,
}
}
if err := p.AuthorizeRenewal(crt); err != nil {
return &apiError{
err: err,
code: http.StatusUnauthorized,
context: errContext,
}
}
return nil
}