/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// This is a standalone server that uses various bad certificates.
// The client is expected to connect, initiate an SSL handshake (with SNI
// to indicate which "server" to connect to), and verify the certificate.
// If all is good, the client then sends one encrypted byte and receives that
// same byte back.
// This server also has the ability to "call back" another process waiting on
// it. That is, when the server is all set up and ready to receive connections,
// it will connect to a specified port and issue a simple HTTP request.

#include <stdio.h>

#include "TLSServer.h"

using namespace mozilla;
using namespace mozilla::test;

struct BadCertHost
{
  const char *mHostName;
  const char *mCertName;
};

// Hostname, cert nickname pairs.
const BadCertHost sBadCertHosts[] =
{
  { "expired.example.com", "expired-ee" },
  { "notyetvalid.example.com", "notYetValid" },
  { "before-epoch.example.com", "beforeEpoch" },
  { "selfsigned.example.com", "selfsigned" },
  { "unknownissuer.example.com", "unknownissuer" },
  { "mismatch.example.com", "mismatch" },
  { "mismatch-CN.example.com", "mismatchCN" },
  { "mitm.example.com", "mitm" },
  { "expiredissuer.example.com", "expiredissuer" },
  { "notyetvalidissuer.example.com", "notYetValidIssuer" },
  { "before-epoch-issuer.example.com", "beforeEpochIssuer" },
  { "md5signature.example.com", "md5signature" },
  { "untrusted.example.com", "default-ee" },
  { "untrustedissuer.example.com", "untrustedissuer" },
  { "mismatch-expired.example.com", "mismatch-expired" },
  { "mismatch-notYetValid.example.com", "mismatch-notYetValid" },
  { "mismatch-untrusted.example.com", "mismatch-untrusted" },
  { "untrusted-expired.example.com", "untrusted-expired" },
  { "md5signature-expired.example.com", "md5signature-expired" },
  { "mismatch-untrusted-expired.example.com", "mismatch-untrusted-expired" },
  { "inadequatekeyusage.example.com", "inadequatekeyusage-ee" },
  { "selfsigned-inadequateEKU.example.com", "selfsigned-inadequateEKU" },
  { "self-signed-end-entity-with-cA-true.example.com", "self-signed-EE-with-cA-true" },
  { "ca-used-as-end-entity.example.com", "ca-used-as-end-entity" },
  { "ca-used-as-end-entity-name-mismatch.example.com", "ca-used-as-end-entity" },
  // All of include-subdomains.pinning.example.com is pinned to End Entity
  // Test Cert with nick default-ee. Any other nick will only
  // pass pinning when security.cert_pinning.enforcement.level != strict and
  // otherCA is added as a user-specified trust anchor. See StaticHPKPins.h.
  { "include-subdomains.pinning.example.com", "default-ee" },
  { "good.include-subdomains.pinning.example.com", "default-ee" },
  { "bad.include-subdomains.pinning.example.com", "other-issuer-ee" },
  { "bad.include-subdomains.pinning.example.com.", "other-issuer-ee" },
  { "bad.include-subdomains.pinning.example.com..", "other-issuer-ee" },
  { "exclude-subdomains.pinning.example.com", "default-ee" },
  { "sub.exclude-subdomains.pinning.example.com", "other-issuer-ee" },
  { "test-mode.pinning.example.com", "other-issuer-ee" },
  { "unknownissuer.include-subdomains.pinning.example.com", "unknownissuer" },
  { "unknownissuer.test-mode.pinning.example.com", "unknownissuer" },
  { "nsCertTypeNotCritical.example.com", "nsCertTypeNotCritical" },
  { "nsCertTypeCriticalWithExtKeyUsage.example.com", "nsCertTypeCriticalWithExtKeyUsage" },
  { "nsCertTypeCritical.example.com", "nsCertTypeCritical" },
  { "end-entity-issued-by-v1-cert.example.com", "eeIssuedByV1Cert" },
  { "end-entity-issued-by-non-CA.example.com", "eeIssuedByNonCA" },
  { "inadequate-key-size-ee.example.com", "inadequateKeySizeEE" },
  { "badSubjectAltNames.example.com", "badSubjectAltNames" },
  { "ipAddressAsDNSNameInSAN.example.com", "ipAddressAsDNSNameInSAN" },
  { "noValidNames.example.com", "noValidNames" },
  { "bug413909.xn--hxajbheg2az3al.xn--jxalpdlp", "idn-certificate" },
  { "emptyissuername.example.com", "emptyIssuerName" },
  { "ev-test.example.com", "ev-test" },
  { "ee-from-missing-intermediate.example.com", "ee-from-missing-intermediate" },
  { "imminently-distrusted.example.com", "ee-imminently-distrusted" },
  { "localhost", "unknownissuer" },
  { nullptr, nullptr }
};

int32_t
DoSNISocketConfigBySubjectCN(PRFileDesc* aFd, const SECItem* aSrvNameArr,
                             uint32_t aSrvNameArrSize)
{
  for (uint32_t i = 0; i < aSrvNameArrSize; i++) {
    UniquePORTString name(
      static_cast<char*>(PORT_ZAlloc(aSrvNameArr[i].len + 1)));
    if (name) {
      PORT_Memcpy(name.get(), aSrvNameArr[i].data, aSrvNameArr[i].len);
      if (ConfigSecureServerWithNamedCert(aFd, name.get(), nullptr, nullptr)
            == SECSuccess) {
        return 0;
      }
    }
  }

  return SSL_SNI_SEND_ALERT;
}

int32_t
DoSNISocketConfig(PRFileDesc* aFd, const SECItem* aSrvNameArr,
                  uint32_t aSrvNameArrSize, void* aArg)
{
  const BadCertHost* host = GetHostForSNI(aSrvNameArr, aSrvNameArrSize,
                                          sBadCertHosts);
  if (!host) {
    // No static cert <-> hostname mapping found. This happens when we use a
    // collection of certificates in a given directory and build a cert DB at
    // runtime, rather than using an NSS cert DB populated at build time.
    // (This will be the default in the future.)
    // For all given server names, check if the runtime-built cert DB contains
    // a certificate with a matching subject CN.
    return DoSNISocketConfigBySubjectCN(aFd, aSrvNameArr, aSrvNameArrSize);
  }

  if (gDebugLevel >= DEBUG_VERBOSE) {
    fprintf(stderr, "found pre-defined host '%s'\n", host->mHostName);
  }

  UniqueCERTCertificate cert;
  SSLKEAType certKEA;
  if (SECSuccess != ConfigSecureServerWithNamedCert(aFd, host->mCertName,
                                                    &cert, &certKEA)) {
    return SSL_SNI_SEND_ALERT;
  }

  return 0;
}

int
main(int argc, char *argv[])
{
  if (argc != 2) {
    fprintf(stderr, "usage: %s <NSS DB directory>\n", argv[0]);
    return 1;
  }

  return StartServer(argv[1], DoSNISocketConfig, nullptr);
}
