105 lines
3 KiB
Go
105 lines
3 KiB
Go
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package acme
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import (
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"crypto/rsa"
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"crypto/sha256"
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"crypto/tls"
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"crypto/x509/pkix"
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"encoding/asn1"
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"fmt"
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"github.com/xenolf/lego/log"
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)
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// idPeAcmeIdentifierV1 is the SMI Security for PKIX Certification Extension OID referencing the ACME extension.
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// Reference: https://tools.ietf.org/html/draft-ietf-acme-tls-alpn-01#section-5.1
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var idPeAcmeIdentifierV1 = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 1, 30, 1}
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type tlsALPNChallenge struct {
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jws *jws
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validate validateFunc
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provider ChallengeProvider
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}
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// Solve manages the provider to validate and solve the challenge.
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func (t *tlsALPNChallenge) Solve(chlng challenge, domain string) error {
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log.Infof("[%s] acme: Trying to solve TLS-ALPN-01", domain)
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// Generate the Key Authorization for the challenge
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keyAuth, err := getKeyAuthorization(chlng.Token, t.jws.privKey)
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if err != nil {
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return err
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}
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err = t.provider.Present(domain, chlng.Token, keyAuth)
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if err != nil {
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return fmt.Errorf("[%s] error presenting token: %v", domain, err)
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}
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defer func() {
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err := t.provider.CleanUp(domain, chlng.Token, keyAuth)
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if err != nil {
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log.Warnf("[%s] error cleaning up: %v", domain, err)
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}
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}()
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return t.validate(t.jws, domain, chlng.URL, challenge{Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
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}
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// TLSALPNChallengeBlocks returns PEM blocks (certPEMBlock, keyPEMBlock) with the acmeValidation-v1 extension
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// and domain name for the `tls-alpn-01` challenge.
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func TLSALPNChallengeBlocks(domain, keyAuth string) ([]byte, []byte, error) {
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// Compute the SHA-256 digest of the key authorization.
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zBytes := sha256.Sum256([]byte(keyAuth))
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value, err := asn1.Marshal(zBytes[:sha256.Size])
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if err != nil {
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return nil, nil, err
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}
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// Add the keyAuth digest as the acmeValidation-v1 extension
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// (marked as critical such that it won't be used by non-ACME software).
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// Reference: https://tools.ietf.org/html/draft-ietf-acme-tls-alpn-01#section-3
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extensions := []pkix.Extension{
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{
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Id: idPeAcmeIdentifierV1,
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Critical: true,
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Value: value,
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},
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}
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// Generate a new RSA key for the certificates.
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tempPrivKey, err := generatePrivateKey(RSA2048)
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if err != nil {
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return nil, nil, err
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}
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rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
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// Generate the PEM certificate using the provided private key, domain, and extra extensions.
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tempCertPEM, err := generatePemCert(rsaPrivKey, domain, extensions)
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if err != nil {
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return nil, nil, err
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}
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// Encode the private key into a PEM format. We'll need to use it to generate the x509 keypair.
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rsaPrivPEM := pemEncode(rsaPrivKey)
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return tempCertPEM, rsaPrivPEM, nil
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}
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// TLSALPNChallengeCert returns a certificate with the acmeValidation-v1 extension
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// and domain name for the `tls-alpn-01` challenge.
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func TLSALPNChallengeCert(domain, keyAuth string) (*tls.Certificate, error) {
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tempCertPEM, rsaPrivPEM, err := TLSALPNChallengeBlocks(domain, keyAuth)
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if err != nil {
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return nil, err
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}
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certificate, err := tls.X509KeyPair(tempCertPEM, rsaPrivPEM)
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if err != nil {
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return nil, err
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}
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return &certificate, nil
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}
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