// Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "authpolicy/stub_common.h"

#include <base/check.h>
#include <base/check_op.h>

// For getresuid
#include <unistd.h>

#include <iterator>

#include <base/files/file_path.h>
#include <base/files/file_util.h>
#include <base/files/scoped_file.h>
#include <base/strings/string_util.h>
#include <base/strings/utf_string_conversions.h>

#include "authpolicy/constants.h"
#include "authpolicy/samba_helper.h"

namespace authpolicy {

const int kExitCodeOk = 0;
const int kExitCodeError = 1;
const int kExitCodeUnspecifiedError = 255;

const char kDefaultWorkgroup[] = "WORKGROUP1";
const char kSecondaryWorkgroup[] = "WORKGROUP2";

const char kUserRealm[] = "REALM.EXAMPLE.COM";
const char kMachineRealm[] = "DEVICES.EXAMPLE.COM";
const char kSecondaryWorkgroupRealm[] = "SECONDARY.EXAMPLE.COM";

const char kUserName[] = "user";
const char kUserPrincipal[] = "user@REALM.EXAMPLE.COM";
const char kInvalidUserPrincipal[] = "user.REALM.EXAMPLE.COM";
const char kNonExistingUserPrincipal[] = "non_existing_user@REALM.EXAMPLE.COM";
const char kNetworkErrorUserPrincipal[] =
    "network_error_user@REALM.EXAMPLE.COM";
const char kAccessDeniedUserPrincipal[] =
    "access_denied_user@REALM.EXAMPLE.COM";
const char kKdcRetryUserPrincipal[] = "kdc_retry_user@REALM.EXAMPLE.COM";
const char kKdcRetryFailsUserPrincipal[] =
    "kdc_retry_fails_user@REALM.EXAMPLE.COM";
const char kInsufficientQuotaUserPrincipal[] =
    "insufficient_quota_user@REALM.EXAMPLE.COM";
const char kEncTypeNotSupportedUserPrincipal[] =
    "enc_type_not_supported_user@REALM.EXAMPLE.COM";
const char kExpiredTgtUserPrincipal[] = "tgt_expired@REALM.EXAMPLE.COM";
const char kPasswordChangedUserPrincipal[] =
    "password_changed@REALM.EXAMPLE.COM";
const char kPasswordChangedUserName[] = "password_changed";
const char kNoPwdFieldsUserPrincipal[] = "no_pwd_fields@REALM.EXAMPLE.COM";
const char kNoPwdFieldsUserName[] = "no_pwd_fields";
const char kSeccompUserPrincipal[] = "seccomp@REALM.EXAMPLE.COM";
const char kExpectOuUserPrincipal[] = "expect_ou@REALM.EXAMPLE.COM";

const char kExpectedOuCreatecomputer[] =
    "ou=leaf,ou=\\ a\\\"b\\ ,ou=\\#123,ou=root,dc=REALM,dc=EXAMPLE,dc=COM";
const char* kExpectedOuParts[] = {"leaf", " a\"b ", "#123", "root"};
constexpr size_t kExpectedOuPartsSize = std::size(kExpectedOuParts);

const char kDisplayName[] = "John Doe";
const char kGivenName[] = "John";
const char kCommonName[] = "John Doe [user]";
const uint64_t kPwdLastSet = 131292078840924254ul;
const uint32_t kUserAccountControl = 512;

// Should still be valid GUIDs, so GuidToOctetString() works.
const char kAccountId[] = "f892eb9d-9e11-4a74-b894-0647e218c4df";
const char kAltAccountId[] = "21094d26-9e11-4a74-b894-c8cd12a6f83b";
const char kBadAccountId[] = "88adef4f-74ec-420d-b0a5-3726dbe711eb";
const char kExpiredPasswordAccountId[] = "21094d26-2720-4ba4-942c-c8cd12a6f83b";
const char kNeverExpirePasswordAccountId[] =
    "a95a88c0-862d-48f1-b9f6-ee726d0190f6";
const char kPasswordChangedAccountId[] = "c7297a6d-2b7f-4063-bfa2-c7223e635549";
const char kNoPwdFieldsAccountId[] = "f5ebf5a8-2fc2-46b5-a326-afd958c71f4a";

const char kValidKrb5CCData[] = "valid";
const char kExpiredKrb5CCData[] = "expired";

const char kPassword[] = "p4zzw!5d";
const char kWrongPassword[] = "pAzzwI5d";
const char kExpiredPassword[] = "rootpw";
const char kRejectedPassword[] = "some_previous_pw";
const char kWillExpirePassword[] = "s00Nb4D";

const char kMachineName[] = "testcomp";
const char kTooLongMachineName[] = "too_long_machine_name";
const char kInvalidMachineName[] = "invalid?na:me";
const char kNonExistingMachineName[] = "nonexisting";
const char kEmptyGpoMachineName[] = "emptygpo";
const char kGpoDownloadErrorMachineName[] = "gpodownloaderr";
const char kOneGpoMachineName[] = "onegpo";
const char kTwoGposMachineName[] = "twogpos";
const char kOneGpoKeepVersionMachineName[] = "keepversion1";
const char kTwoGposKeepVersionMachineName[] = "keepversion2";
const char kZeroUserVersionMachineName[] = "zerouserversion";
const char kDisableUserFlagMachineName[] = "disableuserflag";
const char kLoopbackGpoMachineName[] = "loopback";
const char kExpectKeytabMachineName[] = "expectkeytab";
const char kChangePasswordMachineName[] = "changepassword";
const char kPingServerFailMachineName[] = "pingfail";
const char kUnaffiliatedMachineName[] = "unaffiliated";
const char kPropagationRetryMachineName[] = "propagat.nretry";
const char kSeccompMachineName[] = "seccomp";

const char kGpo1Guid[] = "{11111111-1111-1111-1111-111111111111}";
const char kGpo2Guid[] = "{22222222-2222-2222-2222-222222222222}";
const char kErrorGpoGuid[] = "{eeeeeeee-eeee-eeee-eeee-eeeeeeeeeeee}";
const char kSeccompGpoGuid[] = "{seccomps-ecco-mpse-ccom-pseccompsecc}";

const char kGpo1Filename[] = "stub_registry_1.pol";
const char kGpo2Filename[] = "stub_registry_2.pol";

const char kExpectedMachinePassFilename[] = "expected_machine_pass";

// Helper file to implement a global counter that works across processes.
const char kTestCounterFile[] = "test_counter";

namespace {

// Looks up the environment variable with key |env_key|. If |remove_prefix| is
// false, returns its value. If |remove_prefix| is true, the value is expected
// to be 'FILE:<path>' and only <path> is returned. CHECKs that the environment
// variable exists, has the expected prefix if |remove_prefix| is true and that
// the returned path is non-empty.
std::string GetPathFromEnv(const char* env_key, bool remove_prefix) {
  const char* env_value = getenv(env_key);
  CHECK(env_value);
  if (!remove_prefix) {
    CHECK_NE(0, env_value[0]);  // Make sure it's not empty.
    return env_value;
  }

  // Remove FILE: prefix.
  std::string prefixed_path = env_value;
  CHECK(StartsWithCaseSensitive(prefixed_path, kFilePrefix));
  std::string value_without_prefix = prefixed_path.substr(strlen(kFilePrefix));
  CHECK_LT(0u, value_without_prefix.size());  // Make sure it's not empty.
  return value_without_prefix;
}

}  // namespace

std::string GetCommandLine(int argc, const char* const* argv) {
  CHECK_GE(argc, 2);
  std::string command_line = argv[1];
  for (int n = 2; n < argc; ++n) {
    command_line += " ";
    command_line += argv[n];
  }
  return command_line;
}

std::string GetArgValue(int argc, const char* const* argv, const char* name) {
  for (int n = 1; n + 1 < argc; ++n) {
    if (strcmp(argv[n], name) == 0)
      return argv[n + 1];
  }
  return std::string();
}

bool StartsWithCaseSensitive(const std::string& str, const char* search_for) {
  return base::StartsWith(str, search_for, base::CompareCase::SENSITIVE);
}

// Writes |str| to |file_descriptor|.
void WriteFileDescriptor(int file_descriptor, const std::string& str) {
  if (!str.empty()) {
    CHECK(base::WriteFileDescriptor(file_descriptor, str));
  }
}

// Writes |stdout_str| and |stderr_str| to stdout and stderr, resp.
void WriteOutput(const std::string& stdout_str, const std::string& stderr_str) {
  WriteFileDescriptor(STDOUT_FILENO, stdout_str);
  WriteFileDescriptor(STDERR_FILENO, stderr_str);
}

std::string GetKeytabFilePath() {
  return GetPathFromEnv(kKrb5KTEnvKey, true /* remove_prefix */);
}

std::string GetKrb5ConfFilePath() {
  return GetPathFromEnv(kKrb5ConfEnvKey, true /* remove_prefix */);
}

std::string GetKrb5CCFilePath() {
  return GetPathFromEnv(kKrb5CCEnvKey, false /* remove_prefix */);
}

void CheckMachinePassword(const std::string& password) {
  std::wstring wide_password;
  CHECK(base::UTF8ToWide(password.data(), password.size(), &wide_password));
  CHECK_EQ(kMachinePasswordCodePoints, wide_password.size());
}

void TriggerSeccompFailure() {
  // If the tests start failing because this call got added to some seccomp
  // file, switch to any other syscall that is not allowlisted.
  uid_t unused_uid;
  getresuid(&unused_uid, &unused_uid, &unused_uid);
}

int64_t PostIncTestCounter(const base::FilePath& test_dir) {
  const base::FilePath test_path = test_dir.Append(kTestCounterFile);
  int64_t size;
  if (!base::GetFileSize(test_path, &size))
    size = 0;

  // Note: base::WriteFile triggers a seccomp failure, so do it old-school.
  base::ScopedFILE test_file(fopen(test_path.value().c_str(), "a"));
  CHECK(test_file);
  const char zero = 0;
  CHECK_EQ(1U, fwrite(&zero, 1, 1, test_file.get()));
  return size;
}

}  // namespace authpolicy