100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
package api
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import (
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"crypto/x509"
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"encoding/pem"
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"errors"
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"io/ioutil"
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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, up, err := c.get(certURL)
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if err != nil {
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return nil, nil, err
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}
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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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return cert, issuer, nil
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}
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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 cert, issuer, 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) ([]byte, string, error) {
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if len(certURL) == 0 {
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return 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, "", err
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}
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cert, err := ioutil.ReadAll(http.MaxBytesReader(nil, resp.Body, maxBodySize))
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if err != nil {
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return nil, "", err
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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://tools.ietf.org/html/rfc8555#section-7.4.2
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up := getLink(resp.Header, "up")
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return cert, up, err
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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 len(up) == 0 {
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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)
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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)
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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)), nil
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}
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