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#!/usr/bin/env perl
# Fake LDAP server for Gerrit
# Author: Olivier Croquette <ocroquette@free.fr>
# Last change: 2012-11-12
#
# Abstract:
# ====================================================================
#
# Gerrit currently supports several authentication schemes, but
# unfortunately not the most basic one, e.g. local accounts with
# local passwords.
#
# As a workaround, this script implements a minimal LDAP server
# that can be used to authenticate against Gerrit. The information
# required by Gerrit relative to users (user ID, password, display
# name, email) is stored in a text file similar to /etc/passwd
#
#
# Usage (see below for the setup)
# ====================================================================
#
# To create a new file to store the user information:
# fake-ldap edituser --datafile /path/datafile --username maxpower \
# --displayname "Max Power" --email max.power@provider.com
#
# To modify an existing user (for instance the email):
# fake-ldap edituser --datafile /path/datafile --username ocroquette \
# --email max.power@provider2.com
#
# To set a new password for an existing user:
# fake-ldap edituser --datafile /path/datafile --username ocroquette \
# --password ""
#
# To start the server:
# fake-ldap start --datafile /path/datafile
#
# The server reads the user data file on each new connection. It's not
# scalable but it should not be a problem for the intended usage
# (small teams, testing,...)
#
#
# Setup
# ===================================================================
#
# Install the dependencies
#
# Install the Perl module dependencies. On Debian and MacPorts,
# all modules are available as packages, except Net::LDAP::Server.
#
# Debian: apt-get install libterm-readkey-perl
#
# Since Net::LDAP::Server consists only of one file, you can put it
# along the script in Net/LDAP/Server.pm
#
# Create the data file with the first user (see above)
#
# Start as the script a server ("start" command, see above)
#
# Configure Gerrit with the following options:
#
# gerrit.canonicalWebUrl = ... (workaround for a known Gerrit bug)
# auth.type = LDAP_BIND
# ldap.server = ldap://localhost:10389
# ldap.accountBase = ou=People,dc=nodomain
# ldap.groupBase = ou=Group,dc=nodomain
#
# Start Gerrit
#
# Log on in the Web interface
#
# If you want the fake LDAP server to start at boot time, add it to
# /etc/inittab, with a line like:
#
# ld1:6:respawn:su someuser /path/fake-ldap start --datafile /path/datafile
#
# ===================================================================
use strict;
# Global var containing the options passed on the command line:
my %cmdLineOptions;
# Global var containing the user data read from the data file:
my %userData;
my $defaultport = 10389;
package MyServer;
use Data::Dumper;
use Net::LDAP::Server;
use Net::LDAP::Constant qw(LDAP_SUCCESS LDAP_INVALID_CREDENTIALS LDAP_OPERATIONS_ERROR);
use IO::Socket;
use IO::Select;
use Term::ReadKey;
use Getopt::Long;
use base 'Net::LDAP::Server';
sub bind {
my $self = shift;
my ($reqData, $fullRequest) = @_;
print "bind called\n" if $cmdLineOptions{verbose} >= 1;
print Dumper(\@_) if $cmdLineOptions{verbose} >= 2;
my $sha1 = undef;
my $uid = undef;
eval{
$uid = $reqData->{name};
$sha1 = main::encryptpwd($uid, $reqData->{authentication}->{simple})
};
if ($@) {
warn $@;
return({
'matchedDN' => '',
'errorMessage' => $@,
'resultCode' => LDAP_OPERATIONS_ERROR
});
}
print $sha1 . "\n" if $cmdLineOptions{verbose} >= 2;
print Dumper($userData{$uid}) . "\n" if $cmdLineOptions{verbose} >= 2;
if ( defined($sha1) && $sha1 && $userData{$uid} && ( $sha1 eq $userData{$uid}->{password} ) ) {
print "authentication of $uid succeeded\n" if $cmdLineOptions{verbose} >= 1;
return({
'matchedDN' => "dn=$uid,ou=People,dc=nodomain",
'errorMessage' => '',
'resultCode' => LDAP_SUCCESS
});
}
else {
print "authentication of $uid failed\n" if $cmdLineOptions{verbose} >= 1;
return({
'matchedDN' => '',
'errorMessage' => '',
'resultCode' => LDAP_INVALID_CREDENTIALS
});
}
}
sub search {
my $self = shift;
my ($reqData, $fullRequest) = @_;
print "search called\n" if $cmdLineOptions{verbose} >= 1;
print Dumper($reqData) if $cmdLineOptions{verbose} >= 2;
my @entries;
if ( $reqData->{baseObject} eq 'ou=People,dc=nodomain' ) {
my $uid = $reqData->{filter}->{equalityMatch}->{assertionValue};
push @entries, Net::LDAP::Entry->new ( "dn=$uid,ou=People,dc=nodomain",
, 'objectName'=>"dn=uid,ou=People,dc=nodomain", 'uid'=>$uid, 'mail'=>$userData{$uid}->{email}, 'displayName'=>$userData{$uid}->{displayName});
}
elsif ( $reqData->{baseObject} eq 'ou=Group,dc=nodomain' ) {
push @entries, Net::LDAP::Entry->new ( 'dn=Users,ou=Group,dc=nodomain',
, 'objectName'=>'dn=Users,ou=Group,dc=nodomain');
}
return {
'matchedDN' => '',
'errorMessage' => '',
'resultCode' => LDAP_SUCCESS
}, @entries;
}
package main;
use Digest::SHA1 qw(sha1 sha1_hex sha1_base64);
sub exitWithError {
my $msg = shift;
print STDERR $msg . "\n";
exit(1);
}
sub encryptpwd {
my ($uid, $passwd) = @_;
# Use the user id to compute the hash, to avoid rainbox table attacks
return sha1_hex($uid.$passwd);
}
my $result = Getopt::Long::GetOptions (
"port=i" => \$cmdLineOptions{port},
"datafile=s" => \$cmdLineOptions{datafile},
"email=s" => \$cmdLineOptions{email},
"displayname=s" => \$cmdLineOptions{displayName},
"username=s" => \$cmdLineOptions{userName},
"password=s" => \$cmdLineOptions{password},
"verbose=i" => \$cmdLineOptions{verbose},
);
exitWithError("Failed to parse command line arguments") if ! $result;
exitWithError("Please provide a valid path for the datafile") if ! $cmdLineOptions{datafile};
my @commands = qw(start edituser);
if ( @ARGV != 1 || ! grep {$_ eq $ARGV[0]} @commands ) {
exitWithError("Please provide a valid command among: " . join(",", @commands));
}
my $command = $ARGV[0];
if ( $command eq "start") {
startServer();
}
elsif ( $command eq "edituser") {
editUser();
}
sub startServer() {
my $port = $cmdLineOptions{port} || $defaultport;
print "starting on port $port\n" if $cmdLineOptions{verbose} >= 1;
my $sock = IO::Socket::INET->new(
Listen => 5,
Proto => 'tcp',
Reuse => 1,
LocalAddr => "localhost", # Comment this line if Gerrit doesn't run on this host
LocalPort => $port
);
my $sel = IO::Select->new($sock);
my %Handlers;
while (my @ready = $sel->can_read) {
foreach my $fh (@ready) {
if ($fh == $sock) {
# Make sure the data is up to date on new every connection
readUserData();
# let's create a new socket
my $psock = $sock->accept;
$sel->add($psock);
$Handlers{*$psock} = MyServer->new($psock);
} else {
my $result = $Handlers{*$fh}->handle;
if ($result) {
# we have finished with the socket
$sel->remove($fh);
$fh->close;
delete $Handlers{*$fh};
}
}
}
}
}
sub readUserData {
%userData = ();
open (MYFILE, "<$cmdLineOptions{datafile}") || exitWithError("Could not open \"$cmdLineOptions{datafile}\" for reading");
while (<MYFILE>) {
chomp;
my @fields = split(/:/, $_);
$userData{$fields[0]} = { password=>$fields[1], displayName=>$fields[2], email=>$fields[3] };
}
close (MYFILE);
}
sub writeUserData {
open (MYFILE, ">$cmdLineOptions{datafile}") || exitWithError("Could not open \"$cmdLineOptions{datafile}\" for writing");
foreach my $userid (sort(keys(%userData))) {
my $userInfo = $userData{$userid};
print MYFILE join(":",
$userid,
$userInfo->{password},
$userInfo->{displayName},
$userInfo->{email}
). "\n";
}
close (MYFILE);
}
sub readPassword {
Term::ReadKey::ReadMode('noecho');
my $password = Term::ReadKey::ReadLine(0);
Term::ReadKey::ReadMode('normal');
print "\n";
return $password;
}
sub readAndConfirmPassword {
print "Please enter the password: ";
my $pwd = readPassword();
print "Please re-enter the password: ";
my $pwdCheck = readPassword();
exitWithError("The passwords are different") if $pwd ne $pwdCheck;
return $pwd;
}
sub editUser {
exitWithError("Please provide a valid user name") if ! $cmdLineOptions{userName};
my $userName = $cmdLineOptions{userName};
readUserData() if -r $cmdLineOptions{datafile};
my $encryptedPassword = undef;
if ( ! defined($userData{$userName}) ) {
# New user
exitWithError("Please provide a valid display name") if ! $cmdLineOptions{displayName};
exitWithError("Please provide a valid email") if ! $cmdLineOptions{email};
$userData{$userName} = { };
if ( ! defined($cmdLineOptions{password}) ) {
# No password provided on the command line. Force reading from terminal.
$cmdLineOptions{password} = "";
}
}
if ( defined($cmdLineOptions{password}) && ! $cmdLineOptions{password} ) {
$cmdLineOptions{password} = readAndConfirmPassword();
exitWithError("Please provide a non empty password") if ! $cmdLineOptions{password};
}
if ( $cmdLineOptions{password} ) {
$encryptedPassword = encryptpwd($userName, $cmdLineOptions{password});
}
$userData{$userName}->{password} = $encryptedPassword if $encryptedPassword;
$userData{$userName}->{displayName} = $cmdLineOptions{displayName} if $cmdLineOptions{displayName};
$userData{$userName}->{email} = $cmdLineOptions{email} if $cmdLineOptions{email};
# print Data::Dumper::Dumper(\%userData);
print "New user data for $cmdLineOptions{userName}:\n";
foreach ( sort(keys(%{$userData{$userName}}))) {
printf " %-15s : %s\n", $_, $userData{$userName}->{$_}
}
writeUserData();
}