misc: addressed minor cert lint issues

backend/src/lib/api-docs/constants.ts

@@ -1073,6 +1073,10 @@ export const CERTIFICATE_AUTHORITIES = {
     certificateChain: "The certificate chain of the CA",
     serialNumber: "The serial number of the CA certificate"
   },
+  GET_CERT_BY_ID: {
+    caId: "The ID of the CA to get the certificate from",
+    caCertId: "The ID of the CA certificate to get"
+  },
   GET_CA_CERTS: {
     caId: "The ID of the CA to get the CA certificates for",
     certificate: "The certificate body of the CA certificate",

backend/src/server/routes/v1/certificate-authority-router.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-floating-promises */
 import ms from "ms";
 import { z } from "zod";
 
@@ -139,6 +140,33 @@ export const registerCaRouter = async (server: FastifyZodProvider) => {
     }
   });
 
+  // this endpoint will be used to serve the CA certificate when a client makes a request
+  // against the Authority Information Access CA Issuer URL
+  server.route({
+    method: "GET",
+    url: "/:caId/certificates/:caCertId",
+    config: {
+      rateLimit: readLimit
+    },
+    schema: {
+      description: "Public endpoint for fetching DER-encoded Certificate of CA",
+      params: z.object({
+        caId: z.string().trim().describe(CERTIFICATE_AUTHORITIES.GET_CERT_BY_ID.caId),
+        caCertId: z.string().trim().describe(CERTIFICATE_AUTHORITIES.GET_CERT_BY_ID.caCertId)
+      }),
+      response: {
+        200: z.instanceof(Buffer)
+      }
+    },
+    handler: async (req, res) => {
+      const caCert = await server.services.certificateAuthority.getCaCertById(req.params);
+
+      res.header("Content-Type", "application/pkix-cert");
+
+      return Buffer.from(caCert.rawData);
+    }
+  });
+
   server.route({
     method: "PATCH",
     url: "/:caId",

backend/src/services/certificate-authority/certificate-authority-fns.ts

@@ -15,7 +15,7 @@ import {
 
 /* eslint-disable no-bitwise */
 export const createSerialNumber = () => {
-  const randomBytes = crypto.randomBytes(32);
+  const randomBytes = crypto.randomBytes(20);
   randomBytes[0] &= 0x7f; // ensure the first bit is 0
   return randomBytes.toString("hex");
 };

backend/src/services/certificate-authority/certificate-authority-service.ts

@@ -762,6 +762,39 @@ export const certificateAuthorityServiceFactory = ({
     };
   };
 
+  /**
+   * Return CA certificate object by ID
+   */
+  const getCaCertById = async ({ caId, caCertId }: { caId: string; caCertId: string }) => {
+    const caCert = await certificateAuthorityCertDAL.findOne({
+      caId,
+      id: caCertId
+    });
+
+    if (!caCert) {
+      throw new NotFoundError({ message: "CA certificate not found" });
+    }
+
+    const ca = await certificateAuthorityDAL.findById(caId);
+    const keyId = await getProjectKmsCertificateKeyId({
+      projectId: ca.projectId,
+      projectDAL,
+      kmsService
+    });
+
+    const kmsDecryptor = await kmsService.decryptWithKmsKey({
+      kmsId: keyId
+    });
+
+    const decryptedCaCert = await kmsDecryptor({
+      cipherTextBlob: caCert.encryptedCertificate
+    });
+
+    const caCertObj = new x509.X509Certificate(decryptedCaCert);
+
+    return caCertObj;
+  };
+
   /**
    * Issue certificate to be imported back in for intermediate CA
    */
@@ -776,6 +809,7 @@ export const certificateAuthorityServiceFactory = ({
     notAfter,
     maxPathLength
   }: TSignIntermediateDTO) => {
+    const appCfg = getConfig();
     const ca = await certificateAuthorityDAL.findById(caId);
     if (!ca) throw new BadRequestError({ message: "CA not found" });
 
@@ -850,7 +884,7 @@ export const certificateAuthorityServiceFactory = ({
       throw new BadRequestError({ message: "notAfter date is after CA certificate's notAfter date" });
     }
 
-    const { caPrivateKey } = await getCaCredentials({
+    const { caPrivateKey, caSecret } = await getCaCredentials({
       caId: ca.id,
       certificateAuthorityDAL,
       certificateAuthoritySecretDAL,
@@ -859,6 +893,11 @@ export const certificateAuthorityServiceFactory = ({
     });
 
     const serialNumber = createSerialNumber();
+
+    const caCrl = await certificateAuthorityCrlDAL.findOne({ caSecretId: caSecret.id });
+    const distributionPointUrl = `${appCfg.SITE_URL}/api/v1/pki/crl/${caCrl.id}`;
+
+    const caIssuerUrl = `${appCfg.SITE_URL}/api/v1/pki/ca/${ca.id}/certificates/${caCert.id}`;
     const intermediateCert = await x509.X509CertificateGenerator.create({
       serialNumber,
       subject: csrObj.subject,
@@ -878,7 +917,11 @@ export const certificateAuthorityServiceFactory = ({
         ),
         new x509.BasicConstraintsExtension(true, maxPathLength === -1 ? undefined : maxPathLength, true),
         await x509.AuthorityKeyIdentifierExtension.create(caCertObj, false),
-        await x509.SubjectKeyIdentifierExtension.create(csrObj.publicKey)
+        await x509.SubjectKeyIdentifierExtension.create(csrObj.publicKey),
+        new x509.CRLDistributionPointsExtension([distributionPointUrl]),
+        new x509.AuthorityInfoAccessExtension({
+          caIssuers: new x509.GeneralName("url", caIssuerUrl)
+        })
       ]
     });
 
@@ -1169,13 +1212,18 @@ export const certificateAuthorityServiceFactory = ({
     const appCfg = getConfig();
 
     const distributionPointUrl = `${appCfg.SITE_URL}/api/v1/pki/crl/${caCrl.id}`;
+    const caIssuerUrl = `${appCfg.SITE_URL}/api/v1/pki/ca/${ca.id}/certificates/${caCert.id}`;
 
     const extensions: x509.Extension[] = [
       new x509.KeyUsagesExtension(x509.KeyUsageFlags.digitalSignature | x509.KeyUsageFlags.keyEncipherment, true),
       new x509.BasicConstraintsExtension(false),
       new x509.CRLDistributionPointsExtension([distributionPointUrl]),
       await x509.AuthorityKeyIdentifierExtension.create(caCertObj, false),
-      await x509.SubjectKeyIdentifierExtension.create(csrObj.publicKey)
+      await x509.SubjectKeyIdentifierExtension.create(csrObj.publicKey),
+      new x509.AuthorityInfoAccessExtension({
+        caIssuers: new x509.GeneralName("url", caIssuerUrl)
+      }),
+      new x509.CertificatePolicyExtension(["2.5.29.32.0"]) // anyPolicy
     ];
 
     let altNamesArray: {
@@ -1308,6 +1356,7 @@ export const certificateAuthorityServiceFactory = ({
    * Note: CSR is generated externally and submitted to Infisical.
    */
   const signCertFromCa = async (dto: TSignCertFromCaDTO) => {
+    const appCfg = getConfig();
     let ca: TCertificateAuthorities | undefined;
     let certificateTemplate: TCertificateTemplates | undefined;
 
@@ -1432,7 +1481,7 @@ export const certificateAuthorityServiceFactory = ({
         message: "A common name (CN) is required in the CSR or as a parameter to this endpoint"
       });
 
-    const { caPrivateKey } = await getCaCredentials({
+    const { caPrivateKey, caSecret } = await getCaCredentials({
       caId: ca.id,
       certificateAuthorityDAL,
       certificateAuthoritySecretDAL,
@@ -1440,11 +1489,20 @@ export const certificateAuthorityServiceFactory = ({
       kmsService
     });
 
+    const caCrl = await certificateAuthorityCrlDAL.findOne({ caSecretId: caSecret.id });
+    const distributionPointUrl = `${appCfg.SITE_URL}/api/v1/pki/crl/${caCrl.id}`;
+
+    const caIssuerUrl = `${appCfg.SITE_URL}/api/v1/pki/ca/${ca.id}/certificates/${caCert.id}`;
     const extensions: x509.Extension[] = [
       new x509.KeyUsagesExtension(x509.KeyUsageFlags.digitalSignature | x509.KeyUsageFlags.keyEncipherment, true),
       new x509.BasicConstraintsExtension(false),
       await x509.AuthorityKeyIdentifierExtension.create(caCertObj, false),
-      await x509.SubjectKeyIdentifierExtension.create(csrObj.publicKey)
+      await x509.SubjectKeyIdentifierExtension.create(csrObj.publicKey),
+      new x509.CRLDistributionPointsExtension([distributionPointUrl]),
+      new x509.AuthorityInfoAccessExtension({
+        caIssuers: new x509.GeneralName("url", caIssuerUrl)
+      }),
+      new x509.CertificatePolicyExtension(["2.5.29.32.0"]) // anyPolicy
     ];
 
     let altNamesFromCsr: string = "";
@@ -1628,6 +1686,7 @@ export const certificateAuthorityServiceFactory = ({
     renewCaCert,
     getCaCerts,
     getCaCert,
+    getCaCertById,
     signIntermediate,
     importCertToCa,
     issueCertFromCa,