get certificate private key endpoint + migrations

backend/src/db/migrations/20250429232917_store-cert-secret-key-and-chain.ts

@@ -0,0 +1,33 @@
+import { Knex } from "knex";
+
+import { TableName } from "../schemas";
+
+export async function up(knex: Knex): Promise<void> {
+  if (await knex.schema.hasTable(TableName.CertificateBody)) {
+    await knex.schema.alterTable(TableName.CertificateBody, (t) => {
+      t.binary("encryptedCertificateChain").nullable();
+    });
+  }
+
+  if (!(await knex.schema.hasTable(TableName.CertificateSecret))) {
+    await knex.schema.createTable(TableName.CertificateSecret, (t) => {
+      t.uuid("id", { primaryKey: true }).defaultTo(knex.fn.uuid());
+      t.timestamps(true, true, true);
+      t.uuid("certId").notNullable().unique();
+      t.foreign("certId").references("id").inTable(TableName.Certificate).onDelete("CASCADE");
+      t.binary("encryptedPrivateKey").notNullable();
+    });
+  }
+}
+
+export async function down(knex: Knex): Promise<void> {
+  if (await knex.schema.hasTable(TableName.Certificate)) {
+    await knex.schema.dropTable(TableName.CertificateSecret);
+  }
+
+  if (await knex.schema.hasTable(TableName.CertificateBody)) {
+    await knex.schema.alterTable(TableName.CertificateBody, (t) => {
+      t.dropColumn("encryptedCertificateChain");
+    });
+  }
+}

backend/src/db/schemas/certificate-bodies.ts

@@ -14,7 +14,8 @@ export const CertificateBodiesSchema = z.object({
   createdAt: z.date(),
   updatedAt: z.date(),
   certId: z.string().uuid(),
-  encryptedCertificate: zodBuffer
+  encryptedCertificate: zodBuffer,
+  encryptedCertificateChain: zodBuffer.nullable().optional()
 });
 
 export type TCertificateBodies = z.infer<typeof CertificateBodiesSchema>;

backend/src/db/schemas/certificate-secrets.ts

@@ -5,6 +5,8 @@
 
 import { z } from "zod";
 
+import { zodBuffer } from "@app/lib/zod";
+
 import { TImmutableDBKeys } from "./models";
 
 export const CertificateSecretsSchema = z.object({
@@ -12,8 +14,7 @@ export const CertificateSecretsSchema = z.object({
   createdAt: z.date(),
   updatedAt: z.date(),
   certId: z.string().uuid(),
-  pk: z.string(),
-  sk: z.string()
+  encryptedPrivateKey: zodBuffer
 });
 
 export type TCertificateSecrets = z.infer<typeof CertificateSecretsSchema>;

backend/src/db/schemas/organizations.ts

@@ -23,7 +23,6 @@ export const OrganizationsSchema = z.object({
   defaultMembershipRole: z.string().default("member"),
   enforceMfa: z.boolean().default(false),
   selectedMfaMethod: z.string().nullable().optional(),
-  secretShareSendToAnyone: z.boolean().default(true).nullable().optional(),
   allowSecretSharingOutsideOrganization: z.boolean().default(true).nullable().optional(),
   shouldUseNewPrivilegeSystem: z.boolean().default(true),
   privilegeUpgradeInitiatedByUsername: z.string().nullable().optional(),

backend/src/db/schemas/projects.ts

@@ -27,7 +27,7 @@ export const ProjectsSchema = z.object({
   description: z.string().nullable().optional(),
   type: z.string(),
   enforceCapitalization: z.boolean().default(false),
-  hasDeleteProtection: z.boolean().default(true).nullable().optional()
+  hasDeleteProtection: z.boolean().default(false).nullable().optional()
 });
 
 export type TProjects = z.infer<typeof ProjectsSchema>;

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

@@ -64,6 +64,51 @@ export const registerCertRouter = async (server: FastifyZodProvider) => {
     }
   });
 
+  // TODO(andrey): In the future add support for other formats outside of PEM. Adding a "format" query param may be best.
+  server.route({
+    method: "GET",
+    url: "/:serialNumber/private-key",
+    config: {
+      rateLimit: readLimit
+    },
+    onRequest: verifyAuth([AuthMode.JWT, AuthMode.IDENTITY_ACCESS_TOKEN]),
+    schema: {
+      hide: false,
+      tags: [ApiDocsTags.PkiCertificates],
+      description: "Get certificate private key",
+      params: z.object({
+        serialNumber: z.string().trim().describe(CERTIFICATES.GET.serialNumber)
+      }),
+      response: {
+        200: z.string().trim()
+      }
+    },
+    handler: async (req) => {
+      const { ca, cert, certPrivateKey } = await server.services.certificate.getCertPrivateKey({
+        serialNumber: req.params.serialNumber,
+        actor: req.permission.type,
+        actorId: req.permission.id,
+        actorAuthMethod: req.permission.authMethod,
+        actorOrgId: req.permission.orgId
+      });
+
+      await server.services.auditLog.createAuditLog({
+        ...req.auditLogInfo,
+        projectId: ca.projectId,
+        event: {
+          type: EventType.GET_CERT,
+          metadata: {
+            certId: cert.id,
+            cn: cert.commonName,
+            serialNumber: cert.serialNumber
+          }
+        }
+      });
+
+      return certPrivateKey;
+    }
+  });
+
   server.route({
     method: "POST",
     url: "/issue-certificate",

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

@@ -1,6 +1,11 @@
+import crypto from "node:crypto";
+
 import * as x509 from "@peculiar/x509";
 
-import { CrlReason } from "./certificate-types";
+import { NotFoundError } from "@app/lib/errors";
+
+import { getProjectKmsCertificateKeyId } from "../project/project-fns";
+import { CrlReason, TGetCertificateCredentialsDTO } from "./certificate-types";
 
 export const revocationReasonToCrlCode = (crlReason: CrlReason) => {
   switch (crlReason) {
@@ -46,3 +51,44 @@ export const constructPemChainFromCerts = (certificates: x509.X509Certificate[])
     .map((cert) => cert.toString("pem"))
     .join("\n")
     .trim();
+
+/**
+ * Return the public and private key of certificate
+ * Note: credentials are returned as PEM strings
+ */
+export const getCertificateCredentials = async ({
+  certId,
+  projectId,
+  certificateSecretDAL,
+  projectDAL,
+  kmsService
+}: TGetCertificateCredentialsDTO) => {
+  const certificateSecret = await certificateSecretDAL.findOne({ certId });
+  if (!certificateSecret)
+    throw new NotFoundError({ message: `Certificate secret for certificate with ID '${certId}' not found` });
+
+  const keyId = await getProjectKmsCertificateKeyId({
+    projectId,
+    projectDAL,
+    kmsService
+  });
+
+  const kmsDecryptor = await kmsService.decryptWithKmsKey({
+    kmsId: keyId
+  });
+  const decryptedPrivateKey = await kmsDecryptor({
+    cipherTextBlob: certificateSecret.encryptedPrivateKey
+  });
+
+  const skObj = crypto.createPrivateKey({ key: decryptedPrivateKey, format: "der", type: "pkcs8" });
+  const certPrivateKey = skObj.export({ format: "pem", type: "pkcs8" }).toString();
+
+  const pkObj = crypto.createPublicKey(skObj);
+  const certPublicKey = pkObj.export({ format: "pem", type: "spki" }).toString();
+
+  return {
+    certificateSecret,
+    certPrivateKey,
+    certPublicKey
+  };
+};

backend/src/services/certificate/certificate-secret-dal.ts

@@ -0,0 +1,10 @@
+import { TDbClient } from "@app/db";
+import { TableName } from "@app/db/schemas";
+import { ormify } from "@app/lib/knex";
+
+export type TCertificateSecretDALFactory = ReturnType<typeof certificateSecretDALFactory>;
+
+export const certificateSecretDALFactory = (db: TDbClient) => {
+  const caSecretOrm = ormify(db, TableName.CertificateSecret);
+  return caSecretOrm;
+};

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

@@ -15,11 +15,13 @@ import { TProjectDALFactory } from "@app/services/project/project-dal";
 import { getProjectKmsCertificateKeyId } from "@app/services/project/project-fns";
 
 import { getCaCertChain, rebuildCaCrl } from "../certificate-authority/certificate-authority-fns";
-import { revocationReasonToCrlCode } from "./certificate-fns";
+import { getCertificateCredentials, revocationReasonToCrlCode } from "./certificate-fns";
+import { TCertificateSecretDALFactory } from "./certificate-secret-dal";
 import { CertStatus, TDeleteCertDTO, TGetCertBodyDTO, TGetCertDTO, TRevokeCertDTO } from "./certificate-types";
 
 type TCertificateServiceFactoryDep = {
   certificateDAL: Pick<TCertificateDALFactory, "findOne" | "deleteById" | "update" | "find">;
+  certificateSecretDAL: Pick<TCertificateSecretDALFactory, "findOne">;
   certificateBodyDAL: Pick<TCertificateBodyDALFactory, "findOne">;
   certificateAuthorityDAL: Pick<TCertificateAuthorityDALFactory, "findById">;
   certificateAuthorityCertDAL: Pick<TCertificateAuthorityCertDALFactory, "findById">;
@@ -34,6 +36,7 @@ export type TCertificateServiceFactory = ReturnType<typeof certificateServiceFac
 
 export const certificateServiceFactory = ({
   certificateDAL,
+  certificateSecretDAL,
   certificateBodyDAL,
   certificateAuthorityDAL,
   certificateAuthorityCertDAL,
@@ -67,6 +70,40 @@ export const certificateServiceFactory = ({
     };
   };
 
+  /**
+   * Get certificate private key.
+   */
+  const getCertPrivateKey = async ({ serialNumber, actorId, actorAuthMethod, actor, actorOrgId }: TGetCertDTO) => {
+    const cert = await certificateDAL.findOne({ serialNumber });
+    const ca = await certificateAuthorityDAL.findById(cert.caId);
+
+    const { permission } = await permissionService.getProjectPermission({
+      actor,
+      actorId,
+      projectId: ca.projectId,
+      actorAuthMethod,
+      actorOrgId,
+      actionProjectType: ActionProjectType.CertificateManager
+    });
+
+    // TODO(andrey): Update permission for privateKey fetching. Should be very strict.
+    ForbiddenError.from(permission).throwUnlessCan(ProjectPermissionActions.Read, ProjectPermissionSub.Certificates);
+
+    const { certPrivateKey } = await getCertificateCredentials({
+      certId: ca.id,
+      projectId: ca.projectId,
+      certificateSecretDAL,
+      projectDAL,
+      kmsService
+    });
+
+    return {
+      ca,
+      cert,
+      certPrivateKey
+    };
+  };
+
   /**
    * Delete certificate with serial number [serialNumber]
    */
@@ -203,6 +240,7 @@ export const certificateServiceFactory = ({
 
   return {
     getCert,
+    getCertPrivateKey,
     deleteCert,
     revokeCert,
     getCertBody

backend/src/services/certificate/certificate-types.ts

@@ -2,6 +2,10 @@ import * as x509 from "@peculiar/x509";
 
 import { TProjectPermission } from "@app/lib/types";
 
+import { TKmsServiceFactory } from "../kms/kms-service";
+import { TProjectDALFactory } from "../project/project-dal";
+import { TCertificateSecretDALFactory } from "./certificate-secret-dal";
+
 export enum CertStatus {
   ACTIVE = "active",
   REVOKED = "revoked"
@@ -73,3 +77,11 @@ export type TRevokeCertDTO = {
 export type TGetCertBodyDTO = {
   serialNumber: string;
 } & Omit<TProjectPermission, "projectId">;
+
+export type TGetCertificateCredentialsDTO = {
+  certId: string;
+  projectId: string;
+  certificateSecretDAL: Pick<TCertificateSecretDALFactory, "findOne">;
+  projectDAL: Pick<TProjectDALFactory, "findOne" | "updateById" | "transaction">;
+  kmsService: Pick<TKmsServiceFactory, "decryptWithKmsKey" | "generateKmsKey">;
+};