130 lines
3.7 KiB
Go
130 lines
3.7 KiB
Go
package tlsalpn01
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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/go-acme/lego/v3/acme"
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"github.com/go-acme/lego/v3/acme/api"
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"github.com/go-acme/lego/v3/certcrypto"
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"github.com/go-acme/lego/v3/challenge"
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"github.com/go-acme/lego/v3/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-07#section-6.1
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var idPeAcmeIdentifierV1 = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 1, 31}
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type ValidateFunc func(core *api.Core, domain string, chlng acme.Challenge) error
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type Challenge struct {
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core *api.Core
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validate ValidateFunc
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provider challenge.Provider
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}
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func NewChallenge(core *api.Core, validate ValidateFunc, provider challenge.Provider) *Challenge {
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return &Challenge{
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core: core,
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validate: validate,
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provider: provider,
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}
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}
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func (c *Challenge) SetProvider(provider challenge.Provider) {
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c.provider = provider
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}
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// Solve manages the provider to validate and solve the challenge.
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func (c *Challenge) Solve(authz acme.Authorization) error {
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domain := authz.Identifier.Value
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log.Infof("[%s] acme: Trying to solve TLS-ALPN-01", challenge.GetTargetedDomain(authz))
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chlng, err := challenge.FindChallenge(challenge.TLSALPN01, authz)
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if err != nil {
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return err
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}
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// Generate the Key Authorization for the challenge
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keyAuth, err := c.core.GetKeyAuthorization(chlng.Token)
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if err != nil {
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return err
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}
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err = c.provider.Present(domain, chlng.Token, keyAuth)
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if err != nil {
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return fmt.Errorf("[%s] acme: error presenting token: %w", challenge.GetTargetedDomain(authz), err)
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}
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defer func() {
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err := c.provider.CleanUp(domain, chlng.Token, keyAuth)
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if err != nil {
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log.Warnf("[%s] acme: cleaning up failed: %v", challenge.GetTargetedDomain(authz), err)
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}
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}()
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chlng.KeyAuthorization = keyAuth
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return c.validate(c.core, domain, chlng)
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}
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// ChallengeBlocks 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 ChallengeBlocks(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-07#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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tempPrivateKey, err := certcrypto.GeneratePrivateKey(certcrypto.RSA2048)
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if err != nil {
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return nil, nil, err
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}
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rsaPrivateKey := tempPrivateKey.(*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 := certcrypto.GeneratePemCert(rsaPrivateKey, 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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rsaPrivatePEM := certcrypto.PEMEncode(rsaPrivateKey)
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return tempCertPEM, rsaPrivatePEM, nil
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}
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// ChallengeCert 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 ChallengeCert(domain, keyAuth string) (*tls.Certificate, error) {
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tempCertPEM, rsaPrivatePEM, err := ChallengeBlocks(domain, keyAuth)
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if err != nil {
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return nil, err
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}
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cert, err := tls.X509KeyPair(tempCertPEM, rsaPrivatePEM)
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if err != nil {
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return nil, err
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}
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return &cert, nil
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}
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