feat: added custom key usages support for sign endpoint

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

@@ -654,7 +654,8 @@ export const registerCaRouter = async (server: FastifyZodProvider) => {
             .refine((val) => ms(val) > 0, "TTL must be a positive number")
             .describe(CERTIFICATE_AUTHORITIES.SIGN_CERT.ttl),
           notBefore: validateCaDateField.optional().describe(CERTIFICATE_AUTHORITIES.SIGN_CERT.notBefore),
-          notAfter: validateCaDateField.optional().describe(CERTIFICATE_AUTHORITIES.SIGN_CERT.notAfter)
+          notAfter: validateCaDateField.optional().describe(CERTIFICATE_AUTHORITIES.SIGN_CERT.notAfter),
+          keyUsages: z.nativeEnum(CertKeyUsage).array().optional()
         })
         .refine(
           (data) => {

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

@@ -178,7 +178,8 @@ export const registerCertRouter = async (server: FastifyZodProvider) => {
             .refine((val) => ms(val) > 0, "TTL must be a positive number")
             .describe(CERTIFICATE_AUTHORITIES.SIGN_CERT.ttl),
           notBefore: validateCaDateField.optional().describe(CERTIFICATE_AUTHORITIES.SIGN_CERT.notBefore),
-          notAfter: validateCaDateField.optional().describe(CERTIFICATE_AUTHORITIES.SIGN_CERT.notAfter)
+          notAfter: validateCaDateField.optional().describe(CERTIFICATE_AUTHORITIES.SIGN_CERT.notAfter),
+          keyUsages: z.nativeEnum(CertKeyUsage).array().optional()
         })
         .refine(
           (data) => {

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

@@ -1346,7 +1346,8 @@ export const certificateAuthorityServiceFactory = ({
       altNames,
       ttl,
       notBefore,
-      notAfter
+      notAfter,
+      keyUsages
     } = dto;
 
     let collectionId = pkiCollectionId;
@@ -1466,12 +1467,57 @@ export const certificateAuthorityServiceFactory = ({
     });
 
     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)
     ];
 
+    const csrKeyUsageExtension = csrObj.getExtension("2.5.29.15") as x509.KeyUsagesExtension;
+    let csrKeyUsages: CertKeyUsage[] = [];
+    if (csrKeyUsageExtension) {
+      csrKeyUsages = Object.values(CertKeyUsage).filter(
+        (keyUsage) => (x509.KeyUsageFlags[keyUsage] & csrKeyUsageExtension.usages) !== 0
+      );
+    }
+
+    let selectedKeyUsages: CertKeyUsage[] = keyUsages ?? [];
+    if (keyUsages === undefined && !certificateTemplate) {
+      if (csrKeyUsageExtension) {
+        selectedKeyUsages = csrKeyUsages;
+      } else {
+        selectedKeyUsages = [CertKeyUsage.DIGITAL_SIGNATURE, CertKeyUsage.KEY_ENCIPHERMENT];
+      }
+    }
+
+    if (keyUsages === undefined && certificateTemplate) {
+      if (csrKeyUsageExtension) {
+        const validKeyUsages = certificateTemplate.keyUsages || [];
+        if (csrKeyUsages.some((keyUsage) => !validKeyUsages.includes(keyUsage))) {
+          throw new BadRequestError({
+            message: "Invalid key usage value for certificate"
+          });
+        }
+        selectedKeyUsages = csrKeyUsages;
+      } else {
+        selectedKeyUsages = (certificateTemplate.keyUsages ?? []) as CertKeyUsage[];
+      }
+    }
+
+    if (keyUsages?.length && certificateTemplate) {
+      const validKeyUsages = certificateTemplate.keyUsages || [];
+      if (keyUsages.some((keyUsage) => !validKeyUsages.includes(keyUsage))) {
+        throw new BadRequestError({
+          message: "Invalid key usage value for certificate"
+        });
+      }
+      selectedKeyUsages = keyUsages;
+    }
+
+    const keyUsagesBitValue = selectedKeyUsages.reduce((accum, keyUsage) => accum | x509.KeyUsageFlags[keyUsage], 0);
+    if (keyUsagesBitValue) {
+      extensions.push(new x509.KeyUsagesExtension(keyUsagesBitValue, true));
+    }
+
     let altNamesFromCsr: string = "";
     let altNamesArray: {
       type: "email" | "dns";
@@ -1567,7 +1613,8 @@ export const certificateAuthorityServiceFactory = ({
           altNames: altNamesFromCsr || altNames,
           serialNumber,
           notBefore: notBeforeDate,
-          notAfter: notAfterDate
+          notAfter: notAfterDate,
+          keyUsages: selectedKeyUsages
         },
         tx
       );

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

@@ -113,6 +113,7 @@ export type TSignCertFromCaDTO =
       ttl?: string;
       notBefore?: string;
       notAfter?: string;
+      keyUsages?: CertKeyUsage[];
     }
   | ({
       isInternal: false;
@@ -126,6 +127,7 @@ export type TSignCertFromCaDTO =
       ttl: string;
       notBefore?: string;
       notAfter?: string;
+      keyUsages?: CertKeyUsage[];
     } & Omit<TProjectPermission, "projectId">);
 
 export type TGetCaCertificateTemplatesDTO = {