mirror of
https://github.com/go-acme/lego
synced 2024-06-03 02:32:12 +02:00
139 lines
3.8 KiB
Go
139 lines
3.8 KiB
Go
package api
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import (
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"bytes"
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"crypto/x509"
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"encoding/pem"
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"errors"
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"io"
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"net/http"
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"github.com/go-acme/lego/v4/acme"
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"github.com/go-acme/lego/v4/certcrypto"
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"github.com/go-acme/lego/v4/log"
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)
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// maxBodySize is the maximum size of body that we will read.
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const maxBodySize = 1024 * 1024
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type CertificateService service
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// Get Returns the certificate and the issuer certificate.
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// 'bundle' is only applied if the issuer is provided by the 'up' link.
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func (c *CertificateService) Get(certURL string, bundle bool) ([]byte, []byte, error) {
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cert, _, err := c.get(certURL, bundle)
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if err != nil {
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return nil, nil, err
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}
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return cert.Cert, cert.Issuer, nil
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}
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// GetAll the certificates and the alternate certificates.
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// bundle' is only applied if the issuer is provided by the 'up' link.
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func (c *CertificateService) GetAll(certURL string, bundle bool) (map[string]*acme.RawCertificate, error) {
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cert, headers, err := c.get(certURL, bundle)
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if err != nil {
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return nil, err
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}
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certs := map[string]*acme.RawCertificate{certURL: cert}
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// URLs of "alternate" link relation
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// - https://www.rfc-editor.org/rfc/rfc8555.html#section-7.4.2
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alts := getLinks(headers, "alternate")
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for _, alt := range alts {
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altCert, _, err := c.get(alt, bundle)
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if err != nil {
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return nil, err
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}
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certs[alt] = altCert
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}
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return certs, nil
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}
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// Revoke Revokes a certificate.
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func (c *CertificateService) Revoke(req acme.RevokeCertMessage) error {
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_, err := c.core.post(c.core.GetDirectory().RevokeCertURL, req, nil)
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return err
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}
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// get Returns the certificate and the "up" link.
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func (c *CertificateService) get(certURL string, bundle bool) (*acme.RawCertificate, http.Header, error) {
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if certURL == "" {
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return nil, nil, errors.New("certificate[get]: empty URL")
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}
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resp, err := c.core.postAsGet(certURL, nil)
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if err != nil {
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return nil, nil, err
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}
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data, err := io.ReadAll(http.MaxBytesReader(nil, resp.Body, maxBodySize))
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if err != nil {
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return nil, resp.Header, err
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}
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cert := c.getCertificateChain(data, resp.Header, bundle, certURL)
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return cert, resp.Header, err
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}
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// getCertificateChain Returns the certificate and the issuer certificate.
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func (c *CertificateService) getCertificateChain(cert []byte, headers http.Header, bundle bool, certURL string) *acme.RawCertificate {
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// Get issuerCert from bundled response from Let's Encrypt
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// See https://community.letsencrypt.org/t/acme-v2-no-up-link-in-response/64962
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_, issuer := pem.Decode(cert)
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if issuer != nil {
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// If bundle is false, we want to return a single certificate.
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// To do this, we remove the issuer cert(s) from the issued cert.
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if !bundle {
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cert = bytes.TrimSuffix(cert, issuer)
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}
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return &acme.RawCertificate{Cert: cert, Issuer: issuer}
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}
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// The issuer certificate link may be supplied via an "up" link
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// in the response headers of a new certificate.
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// See https://www.rfc-editor.org/rfc/rfc8555.html#section-7.4.2
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up := getLink(headers, "up")
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issuer, err := c.getIssuerFromLink(up)
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if err != nil {
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// If we fail to acquire the issuer cert, return the issued certificate - do not fail.
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log.Warnf("acme: Could not bundle issuer certificate [%s]: %v", certURL, err)
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} else if len(issuer) > 0 {
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// If bundle is true, we want to return a certificate bundle.
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// To do this, we append the issuer cert to the issued cert.
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if bundle {
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cert = append(cert, issuer...)
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}
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}
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return &acme.RawCertificate{Cert: cert, Issuer: issuer}
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}
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// getIssuerFromLink requests the issuer certificate.
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func (c *CertificateService) getIssuerFromLink(up string) ([]byte, error) {
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if up == "" {
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return nil, nil
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}
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log.Infof("acme: Requesting issuer cert from %s", up)
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cert, _, err := c.get(up, false)
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if err != nil {
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return nil, err
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}
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_, err = x509.ParseCertificate(cert.Cert)
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if err != nil {
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return nil, err
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}
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return certcrypto.PEMEncode(certcrypto.DERCertificateBytes(cert.Cert)), nil
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}
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