package ProFTPD::Tests::Modules::mod_sftp_pam;

use lib qw(t/lib);
use base qw(ProFTPD::TestSuite::Child);
use strict;

use Cwd;
use Digest::MD5;
use File::Copy;
use File::Path qw(mkpath rmtree);
use File::Spec;
use IO::Handle;
use IPC::Open3;
use POSIX qw(:fcntl_h);
use Socket;

use ProFTPD::TestSuite::FTP;
use ProFTPD::TestSuite::Utils qw(:auth :config :features :running :test :testsuite);

$| = 1;

my $order = 0;

my $TESTS = {
  sftp_pam_failed_login_attempts_bug3921 => {
    order => ++$order,
    test_class => [qw(bug forking pam rootprivs ssh2)],
  },

  sftp_pam_with_sql_auth => {
    order => ++$order,
    test_class => [qw(forking mod_sql_sqlite pam rootprivs ssh2)],
  },

};

sub new {
  return shift()->SUPER::new(@_);
}

sub list_tests {
  # Check for the required Perl modules:
  #
  #  Net-SSH2
  #  Net-SSH2-SFTP

  my $required = [qw(
    Net::SSH2
    Net::SSH2::SFTP
  )];

  foreach my $req (@$required) {
    eval "use $req";
    if ($@) {
      print STDERR "\nWARNING:\n + Module '$req' not found, skipping all tests\n";

      if ($ENV{TEST_VERBOSE}) {
        print STDERR "Unable to load $req: $@\n";
      }

      return qw(testsuite_empty_test);
    }
  }

  return testsuite_get_runnable_tests($TESTS);
}

sub set_up {
  my $self = shift;
  $self->SUPER::set_up(@_);

  # Make sure that mod_sftp does not complain about permissions on the hostkey
  # files.

  my $rsa_host_key = File::Spec->rel2abs('t/etc/modules/mod_sftp/ssh_host_rsa_key');
  my $dsa_host_key = File::Spec->rel2abs('t/etc/modules/mod_sftp/ssh_host_dsa_key');

  unless (chmod(0400, $rsa_host_key, $dsa_host_key)) {
    die("Can't set perms on $rsa_host_key, $dsa_host_key: $!");
  }
}

sub sftp_pam_failed_login_attempts_bug3921 {
  my $self = shift;
  my $tmpdir = $self->{tmpdir};

  unless ($ENV{SFTP_PAM_USER} && $ENV{SFTP_PAM_PASSWD}) {
    print STDERR " + unable to run 'sftp_pam_failed_login_attempts_bug3921' test without SFTP_PAM_USER and SFTP_PAM_PASSWD environment variables set, skipping\n";
    return;
  }

  my $config_file = "$tmpdir/sftp.conf";
  my $pid_file = File::Spec->rel2abs("$tmpdir/sftp.pid");
  my $scoreboard_file = File::Spec->rel2abs("$tmpdir/sftp.scoreboard");

  my $log_file = test_get_logfile();

  my $auth_user_file = File::Spec->rel2abs("$tmpdir/sftp.passwd");
  my $auth_group_file = File::Spec->rel2abs("$tmpdir/sftp.group");

  my $user = 'proftpd';
  my $passwd = 'test';
  my $group = 'ftpd';
  my $home_dir = File::Spec->rel2abs($tmpdir);
  my $uid = 500;
  my $gid = 500;

  # Make sure that, if we're running as root, that the home directory has
  # permissions/privs set for the account we create
  if ($< == 0) {
    unless (chmod(0755, $home_dir)) {
      die("Can't set perms on $home_dir to 0755: $!");
    }

    unless (chown($uid, $gid, $home_dir)) {
      die("Can't set owner of $home_dir to $uid/$gid: $!");
    }
  }

  auth_user_write($auth_user_file, $user, $passwd, $uid, $gid, $home_dir,
    '/bin/bash');
  auth_group_write($auth_group_file, $group, $gid, $user);

  my $rsa_host_key = File::Spec->rel2abs('t/etc/modules/mod_sftp/ssh_host_rsa_key');
  my $dsa_host_key = File::Spec->rel2abs('t/etc/modules/mod_sftp/ssh_host_dsa_key');

  my $config = {
    PidFile => $pid_file,
    ScoreboardFile => $scoreboard_file,
    SystemLog => $log_file,
    TraceLog => $log_file,
    Trace => 'DEFAULT:10 ssh2:20 sftp:20 scp:20',

    AuthUserFile => $auth_user_file,
    AuthGroupFile => $auth_group_file,
    AuthOrder => 'mod_auth_file.c',

    IfModules => {
      'mod_delay.c' => {
        DelayEngine => 'off',
      },

      'mod_sftp.c' => [
        "SFTPEngine on",
        "SFTPLog $log_file",
        "SFTPHostKey $rsa_host_key",
        "SFTPHostKey $dsa_host_key",

        "SFTPAuthMethods keyboard-interactive",
      ],

      'mod_sftp_pam.c' => {
        AuthOrder => 'mod_sftp_pam.c* mod_auth_unix.c',
      }, 
    },
  };

  my ($port, $config_user, $config_group) = config_write($config_file, $config);

  # Open pipes, for use between the parent and child processes.  Specifically,
  # the child will indicate when it's done with its test by writing a message
  # to the parent.
  my ($rfh, $wfh);
  unless (pipe($rfh, $wfh)) {
    die("Can't open pipe: $!");
  }

  require Net::SSH2;

  my $ex;

  # Fork child
  $self->handle_sigchld();
  defined(my $pid = fork()) or die("Can't fork: $!");
  if ($pid) {
    eval {
      my $ssh2 = Net::SSH2->new();

      sleep(1);

      unless ($ssh2->connect('127.0.0.1', $port)) {
        my ($err_code, $err_name, $err_str) = $ssh2->error();
        die("Can't connect to SSH2 server: [$err_name] ($err_code) $err_str");
      }

      $user = $ENV{SFTP_PAM_USER};
      my $bad_passwd = 'foobar';
      my $good_passwd = $ENV{SFTP_PAM_PASSWD};

      if ($ssh2->auth_keyboard($user, $bad_passwd)) {
        die("Keyboard-interactive authentication succeeded unexpectedly");
      }

      if ($ssh2->auth_keyboard($user, $bad_passwd)) {
        die("Keyboard-interactive authentication succeeded unexpectedly");
      }

      unless ($ssh2->auth_keyboard($user, $good_passwd)) {
        my ($err_code, $err_name, $err_str) = $ssh2->error();
        die("Can't authenticate to SSH2 server: [$err_name] ($err_code) $err_str");
      }

      $ssh2->disconnect();
    };

    if ($@) {
      $ex = $@;
    }

    $wfh->print("done\n");
    $wfh->flush();

  } else {
    eval { server_wait($config_file, $rfh) };
    if ($@) {
      warn($@);
      exit 1;
    }

    exit 0;
  }

  # Stop server
  server_stop($pid_file);

  $self->assert_child_ok($pid);

  if ($ex) {
    test_append_logfile($log_file, $ex);
    unlink($log_file);

    die($ex);
  }

  unlink($log_file);
}

sub build_db {
  my $cmd = shift;
  my $db_script = shift;
  my $check_exit_status = shift;
  $check_exit_status = 0 unless defined $check_exit_status;

  if ($ENV{TEST_VERBOSE}) {
    print STDERR "Executing sqlite3: $cmd\n";
  }

  my @output = `$cmd`;
  my $exit_status = $?;

  if ($ENV{TEST_VERBOSE}) {
    print STDERR "Output: ", join('', @output), "\n";
  }

  if ($check_exit_status) {
    if ($? != 0) {
      croak("'$cmd' failed");
    }
  }

  unlink($db_script);
  return 1;
}

sub sftp_pam_with_sql_auth {
  my $self = shift;
  my $tmpdir = $self->{tmpdir};

  my $config_file = "$tmpdir/sftp.conf";
  my $pid_file = File::Spec->rel2abs("$tmpdir/sftp.pid");
  my $scoreboard_file = File::Spec->rel2abs("$tmpdir/sftp.scoreboard");

  my $log_file = test_get_logfile();

  my $user = 'proftpd';
  my $passwd = 'test';
  my $group = 'ftpd';
  my $home_dir = File::Spec->rel2abs($tmpdir);
  my $uid = 500;
  my $gid = 500;

  my $db_file = File::Spec->rel2abs("$tmpdir/proftpd.db");

  # Build up sqlite3 command to create users, groups tables and populate them
  my $db_script = File::Spec->rel2abs("$tmpdir/proftpd.sql");

  if (open(my $fh, "> $db_script")) {
    print $fh <<EOS;
CREATE TABLE users (
  userid TEXT,
  passwd TEXT,
  uid INTEGER,
  gid INTEGER,
  homedir TEXT, 
  shell TEXT,
  lastdir TEXT
);
INSERT INTO users (userid, passwd, uid, gid, homedir, shell) VALUES ('$user', '$passwd', $uid, $gid, '$home_dir', '/bin/bash');

CREATE TABLE groups (
  groupname TEXT,
  gid INTEGER,
  members TEXT
);
INSERT INTO groups (groupname, gid, members) VALUES ('$group', $gid, '$user');
EOS

    unless (close($fh)) {
      die("Can't write $db_script: $!");
    }


  } else {
    die("Can't open $db_script: $!");
  }

  my $cmd = "sqlite3 $db_file < $db_script";
  build_db($cmd, $db_script);

  # Make sure that, if we're running as root, the database file has
  # the permissions/privs set for use by proftpd
  if ($< == 0) {
    unless (chmod(0666, $db_file)) {
      die("Can't set perms on $db_file to 0666: $!");
    }
  }

  # Make sure that, if we're running as root, that the home directory has
  # permissions/privs set for the account we create
  if ($< == 0) {
    unless (chmod(0755, $home_dir)) {
      die("Can't set perms on $home_dir to 0755: $!");
    }

    unless (chown($uid, $gid, $home_dir)) {
      die("Can't set owner of $home_dir to $uid/$gid: $!");
    }
  }

  my $rsa_host_key = File::Spec->rel2abs('t/etc/modules/mod_sftp/ssh_host_rsa_key');
  my $dsa_host_key = File::Spec->rel2abs('t/etc/modules/mod_sftp/ssh_host_dsa_key');

  my $config = {
    PidFile => $pid_file,
    ScoreboardFile => $scoreboard_file,
    SystemLog => $log_file,

    IfModules => {
      'mod_delay.c' => {
        DelayEngine => 'off',
      },

      'mod_sftp.c' => [
        "SFTPEngine on",
        "SFTPLog $log_file",
        "SFTPHostKey $rsa_host_key",
        "SFTPHostKey $dsa_host_key",

        "SFTPAuthMethods keyboard-interactive",
      ],

      'mod_sftp_pam.c' => {
        AuthOrder => 'mod_sftp_pam.c* mod_sql.c',
      }, 

      'mod_sql.c' => {
        SQLAuthTypes => 'plaintext',
        SQLBackend => 'sqlite3',
        SQLConnectInfo => $db_file,
        SQLLogFile => $log_file,
      },
    },
  };

  my ($port, $config_user, $config_group) = config_write($config_file, $config);

  # Open pipes, for use between the parent and child processes.  Specifically,
  # the child will indicate when it's done with its test by writing a message
  # to the parent.
  my ($rfh, $wfh);
  unless (pipe($rfh, $wfh)) {
    die("Can't open pipe: $!");
  }

  require Net::SSH2;

  my $ex;

  # Fork child
  $self->handle_sigchld();
  defined(my $pid = fork()) or die("Can't fork: $!");
  if ($pid) {
    eval {
      my $ssh2 = Net::SSH2->new();

      sleep(1);

      unless ($ssh2->connect('127.0.0.1', $port)) {
        my ($err_code, $err_name, $err_str) = $ssh2->error();
        die("Can't connect to SSH2 server: [$err_name] ($err_code) $err_str");
      }

      if ($ssh2->auth_keyboard($user, $passwd)) {
        die("Keyboard-interactive authentication succeeded unexpectedly");
      }

      $ssh2->disconnect();
    };

    if ($@) {
      $ex = $@;
    }

    $wfh->print("done\n");
    $wfh->flush();

  } else {
    eval { server_wait($config_file, $rfh) };
    if ($@) {
      warn($@);
      exit 1;
    }

    exit 0;
  }

  # Stop server
  server_stop($pid_file);

  $self->assert_child_ok($pid);

  if ($ex) {
    test_append_logfile($log_file, $ex);
    unlink($log_file);

    die($ex);
  }

  unlink($log_file);
}

1;
