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validation.go
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validation.go
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package ca
import (
"crypto"
"crypto/x509"
"fmt"
"math/big"
"net/url"
"github.com/andres-erbsen/clock"
"github.com/spiffe/go-spiffe/v2/bundle/x509bundle"
"github.com/spiffe/go-spiffe/v2/spiffeid"
"github.com/spiffe/go-spiffe/v2/svid/x509svid"
"github.com/spiffe/spire/pkg/common/pemutil"
"github.com/spiffe/spire/pkg/common/x509util"
"github.com/spiffe/spire/pkg/server/credvalidator"
)
var (
validationPubkey, _ = pemutil.ParsePublicKey([]byte(`-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEzLY1/SRlsMJExTnuvzBO292RjGjU
3L8jFRtmQl0CjBeHdxUlGK1OkNLDYh0b6AW4siWt+y+DcbUAWNb14e5zWg==
-----END PUBLIC KEY-----`))
)
type X509CAValidator struct {
TrustDomain spiffeid.TrustDomain
CredValidator *credvalidator.Validator
Signer crypto.Signer
Clock clock.Clock
}
func (v *X509CAValidator) ValidateUpstreamX509CA(x509CA, upstreamRoots []*x509.Certificate) error {
return v.validateX509CA(x509CA[0], upstreamRoots, x509CA)
}
func (v *X509CAValidator) ValidateSelfSignedX509CA(x509CA *x509.Certificate) error {
return v.validateX509CA(x509CA, []*x509.Certificate{x509CA}, nil)
}
func (v *X509CAValidator) validateX509CA(x509CA *x509.Certificate, x509Roots, upstreamChain []*x509.Certificate) error {
if err := v.CredValidator.ValidateX509CA(x509CA); err != nil {
return fmt.Errorf("invalid upstream-signed X509 CA: %w", err)
}
spiffeID, err := spiffeid.FromPath(v.TrustDomain, "/spire/throwaway")
if err != nil {
return fmt.Errorf("unexpected error making ID for validation: %w", err)
}
bundle := x509bundle.FromX509Authorities(v.TrustDomain, x509Roots)
svid, err := x509util.CreateCertificate(&x509.Certificate{
SerialNumber: big.NewInt(1),
NotAfter: x509CA.NotAfter,
NotBefore: x509CA.NotBefore,
URIs: []*url.URL{spiffeID.URL()},
}, x509CA, validationPubkey, v.Signer)
if err != nil {
return fmt.Errorf("failed to sign validation certificate: %w", err)
}
svidChain := append([]*x509.Certificate{svid}, upstreamChain...)
if _, _, err := x509svid.Verify(svidChain, bundle); err != nil {
return fmt.Errorf("X509 CA produced an invalid X509-SVID chain: %w", err)
}
return nil
}