From 69f62eb3272157eca2f045f051c44a95efca1279 Mon Sep 17 00:00:00 2001 From: Jonathan McDowell Date: Wed, 15 Jun 2005 10:41:41 +0000 Subject: [PATCH] cscvs to tla changeset 1 Author: noodles Date: 2003/06/04 17:21:57 Initial revision git-archimport-id: noodles@earth.li--pie/autodns--mainline--1.0--base-0 --- ACKNOWLEDGEMENTS | 28 +++ HISTORY | 35 ++++ LICENSE | 280 +++++++++++++++++++++++++++++ README | 78 ++++++++ TODO | 16 ++ autodns.pl | 438 +++++++++++++++++++++++++++++++++++++++++++++ autodns.users | 3 + contrib/add-dns.pl | 148 +++++++++++++++ 8 files changed, 1026 insertions(+) create mode 100644 ACKNOWLEDGEMENTS create mode 100644 HISTORY create mode 100644 LICENSE create mode 100644 README create mode 100644 TODO create mode 100755 autodns.pl create mode 100644 autodns.users create mode 100644 contrib/add-dns.pl diff --git a/ACKNOWLEDGEMENTS b/ACKNOWLEDGEMENTS new file mode 100644 index 0000000..022deb2 --- /dev/null +++ b/ACKNOWLEDGEMENTS @@ -0,0 +1,28 @@ +Stephen White + +Provided much testing and suggestions for improvement. + + +Simon Huggins + +Answered annoying Perl questions when I was too lazy to RTFM. Fixed +various bugs (including locale stuff, deletion of domains, stricter +checking of domain validity). + + +Peter Warasin + +Provided patches to improve functionality (users file, better GPG error +checking etc). + + +Matthew Byng-Maddick + +Provided patches to improve functionality (locking, help, tidier command +processing). + + +Dominic Hargreaves + +Provided add-dns.pl, the beginning (and possibly end) of the contrib +directory. diff --git a/HISTORY b/HISTORY new file mode 100644 index 0000000..f847116 --- /dev/null +++ b/HISTORY @@ -0,0 +1,35 @@ +0.0.1 - 11th December 1999 + +* First release. + +0.0.2 - 22nd December 1999 + +* Added check to make sure there are no illegal characters in the + domain name we are adding. +* Added checking of existing zones so that it's not possible to add the + same zone twice. + +0.0.3 - 17th February 2000 + +* Added check for mail from mailer-daemon, so we don't try to parse + bounces. +* Fixed to work with use strict. +* Wrote a README. +* Forced domains into all lower case. + +0.0.4 - 12th July 2001 + +* Fixed stupid bug that meant we could add zones that already existed. +* Added HELP command. +* Added DEL command. +* Added better checking of domain syntax. +* Fixed gpg locale error (we assumed English messages for parsing). +* Added user configuration file. +* Added locking. +* Don't reply to the same address twice (cc & to). +* Better GPG error checking. +* Added contrib directory (currently with just add-dns.pl in it) + +0.0.5 - 10th November 2002 + +* Changed valid domain regex to allow 4 character TLDs (triggered by .info). diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..b2852a9 --- /dev/null +++ b/LICENSE @@ -0,0 +1,280 @@ +GNU GENERAL PUBLIC LICENSE + + Version 2, June 1991 +Copyright (C) 1989, 1991 Free Software Foundation, Inc. +59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + +Everyone is permitted to copy and distribute verbatim copies +of this license document, but changing it is not allowed. + +Preamble + + The licenses for most software are designed to take away your freedom + to share and change it. 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AutoDNS accepts a GPG clear signed email on +stdin, so can simply be added to a .forward file or whatever. You +configure it to know about the key IDs of all the people you wish to be +able to setup secondaries on your server and add their keys to the GPG +keyring for the user it runs under. + +Most of the configuration options are at the top of autodns.pl, just +after where VERSION is defined. The other bit of config that's needed is +a users file. + +You'll also need a way for the script to be able to do a "ndc reconfig" +to load the info about the new secondary domains - I do this using sudo. + +The format of commands to AutoDNS is very simple. It current accepts 5 +commands: + +BEGIN + Indicate the beginning of a block of commands. +END + Indicate the end of a block of commands. +ADD + Add to the list of secondaried domains. +DEL + Delete from the list of secondaried domains, assuming + it's owned by the current user and is being secondaried + currently. +LIST + List secondaried domains. +HELP + Show basic help. + +So a typical email would contain: + +BEGIN +ADD foo.bar +END + +as the body, which would then be signed with gpg --clearsign and sent. +AutoDNS will reply with the results of the commands sent to it. + + +Users file + +The users file is of a very simple format. It contains one user per +line like so: + +::: + +So an example would be: + +noodles:5B430367:0:212.135.138.190 + +Lines beginning with a '#' are treated as comments. See autodns.users in +the tarball for an example. + + +Contacting the author: + +I can be reached as noodles@earth.li or on Fidonet as Jonathan McDowell +@ 2:443/21 + +All constructive criticism about autodns is welcome. + + +License: + +autodns is distributed under the GNU Public License, a copy of which +should have been provided with this archive as LICENSE. diff --git a/TODO b/TODO new file mode 100644 index 0000000..65cae4a --- /dev/null +++ b/TODO @@ -0,0 +1,16 @@ +* MIME PGP support (so it'll work nicely with mutt). + +* man page. + +* Check nameserver is alive afterwards. + +* Different priviledge levels (users allowed to change master server IP, + allowed to list/delete any domain etc) + +* Restructure to be more modular and cleaner code. + +* Configuration file. + +* Web interface? + +* More (better) documentation? diff --git a/autodns.pl b/autodns.pl new file mode 100755 index 0000000..9a739d0 --- /dev/null +++ b/autodns.pl @@ -0,0 +1,438 @@ +#!/usr/bin/perl -Tw +# autodns 0.0.5 +# Copyright 1999-2001 Project Purple. Written by Jonathan McDowell +# See ACKNOWLEDGEMENTS file for full details of contributors. +# http://www.earth.li/projectpurple/progs/autodns.html +# Released under the GPL. + +use strict; +use IPC::Open3; +use Fcntl qw(:flock); + +$ENV{'PATH'}="/usr/local/bin:/usr/bin:/bin:/usr/sbin"; + +my ($from, $subject, $gpguser, $gpggood, $usersfile, $lockfile, $priv); +my ($user, $server, $inprocess, $delcount, $addcount, $reload_command); +my ($domain, @MAIL, @GPGERROR, @COMMANDS, %zones); +my ($me, $ccreply, $conffile, $domainlistroot, @cfgfiles, $VERSION); + +$VERSION="0.0.5"; + +# +# Local configuration here (until it gets moved to a config file). +# +# These are sort of suitable for a Debian setup. +# + +# Who I should reply as. +$me="autodns\@earth.li"; + +# Who replies should be CCed to. +$ccreply="noodles\@earth.li"; + +# Where to look for zones we're already hosting. +@cfgfiles=("/etc/bind/named.conf", + "/etc/bind/named.secondary.conf"); + +# The file we should add/delete domains from. +$conffile="/etc/bind/named.secondary.conf"; + +# The file that contains details of the authorized users. +$usersfile="/etc/bind/autodns.users"; + +# Base file name to for list of users domains. +$domainlistroot="/etc/bind/domains."; + +# The lockfile we use to ensure we have exclusive access to the +# $domainlistroot$user files and $conffile. +$lockfile="/etc/bind/autodns.lck"; + +# The command to reload the nameserver domains list. +$reload_command="sudo ndc reconfig 2>&1"; + +### +### There should be no need to edit anything below (unless you're not +### using BIND). This statement might even be true now - let me know if not. +### + +# +# Try to figure out what zones we currently know about by parsing config +# files. Sets the item in %zones to 1 for each zone it finds. +# +# Call with the name of a config file to read: +# +# &getzones("/etc/named.conf"); +# +sub getzones { + my ($namedfile) = @_; + + open (NAMEDCONF, "< $namedfile") or + &fatalerror("Can't open $namedfile"); + + while () { + if (/^\s*zone\s*"([^"]+)"/) { + $zones{$1}=1; + } + } + + close NAMEDCONF; +} + +# +# Check that a domain is only made up of valid characters. +# +# These are: a-z, 0-9, - or . +# +sub valid_domain { + my $domain = shift; + $domain = lc $domain; + if ($domain =~ /^(?:[a-z0-9-]+\.)+[a-z]{2,4}$/) { + return 1; + } else { + return 0; + } +} + +# +# Deal with a fatal error by printing an error message, closing the pipe to +# sendmail and exiting. +# +# fatalerror("I'm melting!"); +# +sub fatalerror { + my $message = shift; + + print REPLY $message; + close(REPLY); + + flock(LOCKFILE, LOCK_UN); + close(LOCKFILE); + unlink($lockfile); + +# die $message; + exit; +} + +# +# Get user details from usersfile based on a PGP ID. +# +# A users entry looks like: +# +# ::: +# +# Priviledge level is not currently used. +# +# ($user, $priv, $server) = &getuserinfo("5B430367"); +# +sub getuserinfo { + my $gpguser = shift; + my ($user, $priviledge, $server); + + open (CONFIGFILE, "< $usersfile") or + &fatalerror("Couldn't open user configuration file."); + + foreach () { + if (/^([^#.]+):$gpguser:(\d+):(.+)$/) { + $user=$1; + $priviledge=$2; + $server=$3; + chomp $user; + chomp $priviledge; + chomp $server; + + if ($user !~ /^.+$/) { + close(CONFIGFILE); + &fatalerror("Error in user configuration file: Can't get username.\n"); + } + + if ($server !~ /^(\d{1,3}\.){3}\d{1,3}$/) { + $server =~ s/\d\.]//g; + close(CONFIGFILE); + &fatalerror("Error in user configuration file: Invalid primary server IP address ($server)\n"); + exit; + } + } + } + close(CONFIGFILE); + + if ($user =~ /^$/) { + &fatalerror("User not found.\n"); + } + + return ($user, $priviledge, $server); +} + +$delcount=$addcount=$inprocess=0; + +# Read in the mail from stdin. +@MAIL=<>; + +$subject = "Reply from AutoDNS"; +# Now lets try to find out who it's from. +foreach (@MAIL) { + if (/^$/) { last; } + if (/^From: (.*)/i) { $from=$1; chomp $from;} + if (/^Subject:\s+(re:)?(.*)$/i) { $subject="Re: ".$2 if ($2);} +} + +if ((! defined($from)) || $from =~ /^$/ ) { + die "Couldn't find a from address."; +} elsif ($from =~ /mailer-daemon@/i) { + die "From address is mailer-daemon, ignoring."; +} + +if (! defined($subject)) { $subject="Reply from AutoDNS"; }; + +# We've got a from address. Start a reply. + +open(REPLY, "|sendmail -t -oem -oi") or die "Couldn't spawn sendmail"; + +print REPLY "From: $me\n"; +print REPLY "To: $from\n"; +# +# Check to see if our CC address is the same as the from address and if so +# don't CC. +# +if ($from ne $ccreply) { + print REPLY "Cc: $ccreply\n"; +} +print REPLY <; +@COMMANDS=; +close GPGERR; +close GPGOUT; + +# Check who it's from and if the signature was a good one. +$gpggood=1; +foreach (@GPGERROR) { + chomp; + if (/Signature made.* (.*)$/) { + $gpguser=$1; + } elsif (/error/) { + $gpggood = 0; + print REPLY "Some errors ocurred\n"; + } elsif (/BAD signature/) { + $gpggood = 0; + print REPLY "BAD signature!\n"; + } elsif (/public key not found/) { + $gpggood = 0; + print REPLY "Public Key not found\n"; + } +} + +# If we have an empty user it probably wasn't signed. +if (! $gpguser) { + print REPLY "Message appears not to be GPG signed.\n"; + close REPLY; + exit; +} + +# Check the signature we got was ok. +if ($gpggood) { + print REPLY "Good GPG signature found. ($gpguser)\n"; +} else { + print REPLY "Bad GPG signature!\n"; + close REPLY; + exit; +} + +# Now let's check if we know this person. +($user, $priv, $server) = &getuserinfo($gpguser); + +if (! defined($user) || ! $user) { + print REPLY "Unknown user.\n"; + close REPLY; + exit; +} + +print REPLY "Got user '$user'\n"; + +# Right. We know this is a valid user. Get a lock to ensure we have exclusive +# access to the configs from here on in. +open (LOCKFILE,">$lockfile") || + &fatalerror("Couldn't open lock file\n"); +&fatalerror("Couldn't get lock\n") unless(flock(LOCKFILE,LOCK_EX)); + +# Ok, now we should figure out what domains we already know about. +foreach my $cfgfile (@cfgfiles) { + getzones($cfgfile); +} + +foreach (@COMMANDS) { + # Remove trailing CRs and leading/trailing whitespace + chomp; + s/\r//; + s/^\s*//; + s/\s*$//; + + if ($inprocess) { + print REPLY ">>>$_\n"; + } + + if (/^$/) { + # + # Empty line, so ignore it. + # + } elsif (/^END$/) { + $inprocess=0; + } elsif (/^BEGIN$/) { + $inprocess=1; + } elsif ($inprocess && /^ADD\s+(.*)$/) { + $domain = $1; + + # Convert domain to lower case. + $domain =~ tr/[A-Z]/[a-z]/; + if (! valid_domain($domain)) { + $domain =~ s/[-a-z0-9.]//g; + print REPLY "Invalid character(s) in domain name: $domain\n"; + } elsif (defined($zones{$domain}) && $zones{$domain}) { + print REPLY "We already secondary $domain\n"; + } else { + print REPLY "Adding domain $domain\n"; + $zones{$domain}=1; + + open (DOMAINSFILE, ">>$conffile"); + print DOMAINSFILE " +### Domain added for '$user' + +zone \"$domain\" { + type slave; + masters { $server; }; + file \"secondary/$user/$domain\"; + allow-transfer { none; }; + allow-query { any; }; +};\n"; + close DOMAINSFILE; + + open (DOMAINLIST, ">>$domainlistroot$user") or + &fatalerror("Couldn't open file.\n"); + print DOMAINLIST "$domain\n"; + close DOMAINLIST; + $addcount++; + } + } elsif ($inprocess && /^DEL\s(.*)$/) { + $domain = $1; + + # Convert domain to lower case. + $domain =~ tr/[A-Z]/[a-z]/; + if (!valid_domain($domain)) { + $domain =~ s/[-a-z0-9.]//g; + print REPLY "Invalid character(s) in domain name: $domain\n"; + } elsif (!defined($zones{$domain}) || !$zones{$domain}) { + print REPLY "$domain does not exist!\n"; + } else { + print REPLY "Deleting domain $domain\n"; + my (@newcfg,$found); + + open (DOMAINLIST, "<$domainlistroot$user") or + &fatalerror("Couldn't open file $domainlistroot$user for reading: $!.\n"); + my @cfg = ; + close(DOMAINLIST); + @newcfg = grep { ! /^$domain$/ } @cfg; + if (scalar @cfg == scalar @newcfg) { + print REPLY "Didn't find $domain in $domainlistroot$user!\n"; + print REPLY "You are only allowed to delete your own domains that exist.\n"; + next; + } + + open (DOMAINLIST, ">$domainlistroot$user") or + &fatalerror("Couldn't open file $domainlistroot$user for writing: $!.\n"); + print DOMAINLIST @newcfg; + close DOMAINLIST; + + $found=0; + @newcfg=(); + open (DOMAINSFILE, "<$conffile") or + &fatalerror("Couldn't open file $conffile for reading: $!\n"); + { + local $/ = ''; # eat whole paragraphs + while () { + unless (/^\s*zone\s+"$domain"/) { + push @newcfg, $_; + } else { + $found=1; + if ($newcfg[-1] =~ /^###/) { + # remove comment and \n + pop @newcfg; + } + } + } + } # end of paragraph eating + + if (!$found) { + print REPLY "Didn't find $domain in $conffile!\n"; + next; + } + + open (DOMAINSFILE, ">$conffile") or + &fatalerror("Couldn't open $conffile for writing: $!\n"); + print DOMAINSFILE @newcfg; + close DOMAINSFILE; + $delcount++; + $zones{$domain} = 0; + } + } elsif ($inprocess && /^LIST$/) { + print REPLY "Listing domains for user $user\n"; + print REPLY "------\n"; + if (open (DOMAINLIST, "<$domainlistroot$user")) { + my $count = 0; + while () { + $count++; + print REPLY; + } + close (DOMAINLIST); + print REPLY "------\n"; + print REPLY "Total of $count domains.\n"; + } else { + print REPLY "Couldn't open $domainlistroot$user: $!\n"; + } + } elsif ($inprocess && /^HELP$/) { + print REPLY "In order to use the service, you will need to send GPG signed\n"; + print REPLY "messages.\n\n"; + print REPLY "The format of the text in these messages is important, as they represent\n"; + print REPLY "commands to autodns. Commands are formatted one per line, and enclosed\n"; + print REPLY "by \"BEGIN\" and \"END\" commands (without the quotes).\n"; + print REPLY "Current valid commands are:\n"; + print REPLY "BEGIN - begin processing.\n"; + print REPLY "END - end processing.\n"; + print REPLY "HELP - display this message.\n"; + print REPLY "LIST - show all the zones currently held by you.\n"; + print REPLY "ADD - adds the domain for processing.\n"; + print REPLY "DEL - removes the domain if you own it.\n"; + } elsif ($inprocess) { + print REPLY "Unknown command!\n"; + } +} +flock(LOCKFILE, LOCK_UN); +close(LOCKFILE); +unlink($lockfile); + +print REPLY "Added $addcount domains.\n" if $addcount; +print REPLY "Removed $delcount domains.\n" if $delcount; +if ($addcount || $delcount) { + print REPLY "Reloading nameserver config.\n"; + print REPLY `$reload_command`; +} +close REPLY; + +exit 0; diff --git a/autodns.users b/autodns.users new file mode 100644 index 0000000..56a6979 --- /dev/null +++ b/autodns.users @@ -0,0 +1,3 @@ +# ::: +noodles:5B430367:0:212.135.138.190 +testuser:12345678:0:0.0.0.0 diff --git a/contrib/add-dns.pl b/contrib/add-dns.pl new file mode 100644 index 0000000..53a0e3a --- /dev/null +++ b/contrib/add-dns.pl @@ -0,0 +1,148 @@ +#!/usr/bin/perl -w +# +# add-dns.pl version 0.0.4alpha +# Dominic Hargreaves +# +# Use this to tell nameservers supporting AutoDNS +# (http://www.earth.li/projectpurple/progs/autodns.html) to slave for you. +# +# Changelog: +# +# 03/07/01 dom: Added remotehelp and remove command for AutoDNS 0.0.4alpha +# Changed to header to ns1 (from terry) +# 22/05/01 dom: Initial code completed for AutoDNS 0.0.3 + +use strict; +use IPC::Open3; + +sub usage; + +my $sendmail = "/usr/sbin/sendmail"; +my $gpg = "/usr/bin/gpg"; + +my $to = 'dns-auto@tuschin.blackcatnetworks.co.uk, + dns-auto@ns1.blackcatnetworks.co.uk'; +#my $to = 'dom'; +my $from = 'Urchin Hostmaster '; +my $cc = $from; +#my $cc = ""; +my $keyid = "25B2616D"; +my $command; +my @validcommands = qw(add remove list remotehelp); + +# Only proceed if we have been given a valid command + +die usage unless $ARGV[0]; + +my $ok = 0; +for (@validcommands) { + if ($ARGV[0] eq $_) { + $ok = 1; + } +} + +die usage unless ($ok == 1); + +# Open gpg filehandle + +open3(\*GPGIN, \*GPGOUT, \*GPGERR, "$gpg --default-key $keyid --clearsign"); + +# Generate AutoDNS commands + +print GPGIN "BEGIN\n"; + +$command = shift(@ARGV); + +if ($command eq "list") { + print GPGIN "LIST\n"; +} elsif ($command eq "remotehelp") { + print GPGIN "HELP\n"; +} elsif ($command eq "add") { + for (@ARGV) { + print GPGIN "ADD $_\n"; + } +} elsif ($command eq "remove") { + for (@ARGV) { + print GPGIN "DEL $_\n"; + } +} else { + die usage; +} + +print GPGIN "END\n"; + +close GPGIN; + +my @gpgerror=; +my @gpgout=; +close GPGERR; +close GPGOUT; + +# Show user any error output from gpg... + +for (@gpgerror) { + print STDERR $_; +} + +# ...and what we intend to send + +for (@gpgout) { + print $_; +} + +# Ask user whether this is ok + +print "Send this mail to:\n"; +print $to; +print "\nand\n"; +print $cc; +print "\n? (y/n): "; + +my $mark = "0"; +while () { + if (/^y/i) { + $mark = "1"; + last; + } + /^n/i and last; +} + +if (!($mark eq "1")) { + print "Mail NOT sent.\n"; + exit 1; +} + +# Compose email + +open MAIL, "|$sendmail -t -oi" or die $!; +print MAIL "From: $from\n" or die "Configuration error: $!"; +print MAIL "To: $to\n" or die "Configuration error: $!"; +print MAIL "Cc: $cc\n" if $cc; +print MAIL "Subject: AutoDNS commands\n"; +print MAIL "X-Mailer: add-dns.pl 0.0.4alpha\n\n"; + +for (@gpgout) { + print MAIL $_; +} + +print MAIL "\n"; + +# Send email + +close MAIL; + +sub usage { + print< [list of domains] + +Possible commands: add: Adds domains + remove: Removes domains + list: Lists current domains + remotehelp: Requests help from remote end + +(You must have the private key $keyid in your gpg keyring +for this to work) +EOF + +} + -- 2.39.2