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#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
$Data::Dumper::Indent = 1;
$Data::Dumper::Sortkeys = 1;
# === add-auth-keys ===
# part of the gitolite (GL) suite
# (1) - "compiles" ~/.ssh/authorized_keys from the list of pub-keys
# (2) - also "compiles" the user-friendly GL conf file into something easier
# to parse. We're doing this because both the gl-auth-command and the
# (gl-)update hook need this, and it seems easier to do this than
# replicate the parsing code in both those places. As a bonus, it's
# probably more efficient.
# (3) - finally does what I have resisted doing all along -- handle gitweb and
# git-daemon access. It won't *setup* gitweb/daemon for you -- you have
# to that yourself. What this does is make sure that "repo.git"
# contains the file "git-daemon-export-ok" (for daemon case) and the
# line "repo.git" exists in the "projects.list" file (for gitweb case).
# how run: manual, by GL admin
# when:
# - anytime a pubkey is added/deleted
# - anytime gitolite.conf is changed
# input:
# - GL_CONF (default: ~/.gitolite/conf/gitolite.conf)
# - GL_KEYDIR (default: ~/.gitolite/keydir)
# output:
# - ~/.ssh/authorized_keys (dictated by sshd)
# - GL_CONF_COMPILED (default: ~/.gitolite/conf/gitolite.conf-compiled.pm)
# security:
# - touches a very critical system file that manages the restrictions on
# incoming users. Be sure to audit AUTH_COMMAND and AUTH_OPTIONS (see
# below) on any change to this script
# - no security checks within program. The GL admin runs this manually
# warnings:
# - if the "start" line exists, but the "end" line does not, you lose the
# rest of the existing authkey file. In general, "don't do that (TM)",
# but we do have a "vim -d" popping up so you can see the changes being
# made, just in case...
# ----------------------------------------------------------------------------
# common definitions
# ----------------------------------------------------------------------------
# setup quiet mode if asked; please do not use this when running manually
open STDOUT, ">", "/dev/null" if (@ARGV and shift eq '-q');
# these are set by the "rc" file
our ($GL_ADMINDIR, $GL_CONF, $GL_KEYDIR, $GL_CONF_COMPILED, $REPO_BASE, $REPO_UMASK, $PROJECTS_LIST, $GIT_PATH, $GL_WILDREPOS, $GL_GITCONFIG_KEYS, $GL_PACKAGE_HOOKS);
# and these are set by gitolite.pm
our ($REPONAME_PATT, $REPOPATT_PATT, $USERNAME_PATT, $AUTH_COMMAND, $AUTH_OPTIONS, $ABRT, $WARN);
# the common setup module is in the same directory as this running program is
my $bindir = $0;
$bindir =~ s/\/[^\/]+$//;
$bindir = "$ENV{PWD}/$bindir" unless $bindir =~ /^\//;
require "$bindir/gitolite.pm";
# ask where the rc file is, get it, and "do" it
&where_is_rc();
die "$ABRT parse $ENV{GL_RC} failed: " . ($! or $@) unless do $ENV{GL_RC};
# add a custom path for git binaries, if specified
$ENV{PATH} .= ":$GIT_PATH" if $GIT_PATH;
# ----------------------------------------------------------------------------
# definitions specific to this program
# ----------------------------------------------------------------------------
# command and options for authorized_keys
$AUTH_COMMAND="$bindir/gl-auth-command";
$AUTH_OPTIONS="no-port-forwarding,no-X11-forwarding,no-agent-forwarding";
# note, for most users there's also a "no-pty" added to this, see later
# groups can now represent user groups or repo groups.
# $groups{group}{member} = "master" (or name of fragment file in which the
# group is defined).
our %groups = ();
# %repos has two functions.
# $repos{repo}{R|W}{user} = 1 if user has R (or W) permissions for at least
# one branch in repo. This is used by the "level 1 check" (see faq). There's
# also the new "C" (create a repo) permission now
# $repos{repo}{user} is a list of {ref, perms} pairs. This is used by the
# level 2 check. In order to allow "exclude" rules, the order of rules now
# matters, so what used to be entirely "hash of hash of hash" now has a list
# in between :)
my %repos = ();
# <sigh>... having been forced to use a list as described above, we lose some
# efficiency due to the possibility of the same {ref, perms} pair showing up
# multiple times for the same repo+user. So...
my %rurp_seen = ();
# catch usernames<->pubkeys mismatches; search for "lint" below
my %user_list = ();
# repo configurations
my %repo_config = ();
# gitweb descriptions and owners; plain text, keyed by "$repo.git"
my %desc = ();
my %owner = ();
# set the umask before creating any files
umask($REPO_UMASK);
# ----------------------------------------------------------------------------
# subroutines
# ----------------------------------------------------------------------------
sub expand_list
{
my @list = @_;
my @new_list = ();
for my $item (@list)
{
if ($item =~ /^@/) # nested group
{
die "$ABRT undefined group $item\n" unless $groups{$item};
# add those names to the list
push @new_list, sort keys %{ $groups{$item} };
}
else
{
push @new_list, $item;
}
}
return @new_list;
}
# ----------------------------------------------------------------------------
# "compile" GL conf
# ----------------------------------------------------------------------------
sub parse_conf_file
{
my ($conffile, $fragment) = @_;
# the second arg, $fragment, is passed in as "master" when parsing the
# main config, and the fragment name when parsing a fragment. In the
# latter case, the parser uses that information to ignore (and warn about)
# any repos in the fragment that are not members of the "repo group" of
# the same name.
my %ignored = ();
my $conf_fh = wrap_open( "<", $conffile );
# the syntax is fairly simple, so we parse it inline
my @repos;
while (<$conf_fh>)
{
# kill comments, but take care of "#" inside *simple* strings
s/^((".*?"|[^#"])*)#.*/$1/;
# normalise whitespace; keeps later regexes very simple
s/=/ = /;
s/\s+/ /g;
s/^ //;
s/ $//;
# and blank lines
next unless /\S/;
# user or repo groups
if (/^(@\S+) = (.*)/)
{
# store the members of each group as hash key. Keep track of when
# the group was *first* created by using $fragment as the *value*
do { $groups{$1}{$_} ||= $fragment } for ( expand_list( split(' ', $2) ) );
die "$ABRT bad group $1\n" unless $1 =~ $REPONAME_PATT;
}
# repo(s)
elsif (/^repo (.*)/)
{
# grab the list and expand any @stuff in it
@repos = split ' ', $1;
unless (@repos == 1 and $repos[0] eq '@all') {
@repos = expand_list ( @repos );
do { die "$ABRT bad reponame $_\n" unless ($GL_WILDREPOS ? $_ =~ $REPOPATT_PATT : $_ =~ $REPONAME_PATT) } for @repos;
}
s/\bCREAT[EO]R\b/\$creater/g for @repos;
}
# actual permission line
elsif (/^(-|C|D|R|RW|RW\+) (.* )?= (.+)/)
{
my $perms = $1;
my @refs; @refs = split(' ', $2) if $2;
@refs = expand_list ( @refs );
my @users = split ' ', $3;
die "wildrepos disabled, cant use 'C' in config\n" if $perms eq 'C' and not $GL_WILDREPOS;
# if no ref is given, this PERM applies to all refs
@refs = qw(refs/.*) unless @refs;
# deprecation warning
map { warn "WARNING: old syntax 'PATH/' found; please use new syntax 'NAME/'\n" if s(^PATH/)(NAME/) } @refs;
# fully qualify refs that dont start with "refs/" or "NAME/";
# prefix them with "refs/heads/"
@refs = map { m(^(refs|NAME)/) or s(^)(refs/heads/); $_ } @refs;
@refs = map { s(/USER/)(/\$gl_user/); $_ } @refs;
# expand the user list, unless it is just "@all"
@users = expand_list ( @users )
unless (@users == 1 and $users[0] eq '@all');
do { die "$ABRT bad username $_\n" unless $_ =~ $USERNAME_PATT } for @users;
s/\bCREAT[EO]R\b/~\$creater/g for @users;
s/\bREADERS\b/\$readers/g for @users;
s/\bWRITERS\b/\$writers/g for @users;
# ok, we can finally populate the %repos hash
for my $repo (@repos) # each repo in the current stanza
{
# if we're processing a delegated config file (not the master
# config), we need to prevent attempts by that admin to obtain
# rights on stuff outside his domain
# trying to set access for $repo (='foo')...
if (
# processing the master config, not a fragment
( $fragment eq 'master' ) or
# fragment is also called 'foo' (you're allowed to have a
# fragment that is only concerned with one repo)
( $fragment eq $repo ) or
# fragment is called "bar" and "@bar = foo" has been
# defined in the master config
( ($groups{"\@$fragment"}{$repo} || '') eq 'master' )
) {
# all these are fine
} else {
# this is a little more complex
# fragment is called "bar", one or more "@bar = regex"
# have been specified in master, and "foo" matches some
# such "regex"
my @matched = grep { $repo =~ /^$_$/ }
grep { $groups{"\@$fragment"}{$_} eq 'master' }
sort keys %{ $groups{"\@$fragment"} };
if (@matched < 1) {
$ignored{$fragment}{$repo} = 1;
next;
}
}
for my $user (@users)
{
$user_list{$user}++; # only to catch lint, see later
# for 1st level check (see faq/tips doc)
$repos{$repo}{C}{$user} = 1, next if $perms eq 'C';
$repos{$repo}{R}{$user} = 1 if $perms =~ /R/;
$repos{$repo}{W}{$user} = 1 if $perms =~ /W|D/;
# if the user specified even a single 'D' anywhere, make
# that fact easy to find; this changes the meaning of RW+
# to no longer permit deletes (see update hook)
$repos{$repo}{DELETE_IS_D} = 1 if $perms eq 'D';
# for 2nd level check, store each "ref, perms" pair in order
for my $ref (@refs)
{
# checking NAME based restrictions is expensive for
# the update hook (see the changes to src/hooks/update
# in this commit for why) so we would *very* much like
# to avoid doing it for the large majority of repos
# that do *not* use NAME limits. Setting a flag that
# can be checked right away will help us do that
$repos{$repo}{NAME_LIMITS} = 1 if $ref =~ /^NAME\//;
push @{ $repos{$repo}{$user} }, { $ref => $perms }
unless $rurp_seen{$repo}{$user}{$ref}{$perms}++;
}
}
}
}
# configuration
elsif (/^config (.+) = ?(.*)/)
{
my ($key, $value) = ($1, $2);
my @validkeys = split (' ', ($GL_GITCONFIG_KEYS || ''));
my @matched = grep { $key =~ /^$_$/ } @validkeys;
die "$ABRT git config $key not allowed\n" if (@matched < 1);
for my $repo (@repos) # each repo in the current stanza
{
$repo_config{$repo}{$key} = $value;
}
}
# include
elsif (/^include "(.+)"/)
{
my $file = $1;
$file = "$GL_ADMINDIR/conf/$file" unless $file =~ /^\//;
die "$WARN $fragment attempting to include configuration\n" if $fragment ne 'master';
die "$ABRT included file not found: '$file'\n" unless -f $file;
parse_conf_file($file, $fragment);
}
# very simple syntax for the gitweb description of repo; one of:
# reponame = "some description string"
# reponame "owner name" = "some description string"
elsif (/^(\S+)(?: "(.*?)")? = "(.*)"$/)
{
my ($repo, $owner, $desc) = ($1, $2, $3);
die "$ABRT bad repo name $repo\n" unless $repo =~ $REPONAME_PATT;
die "$WARN $fragment attempting to set description for $repo\n" if
$fragment ne 'master' and $fragment ne $repo and ($groups{"\@$fragment"}{$repo} || '') ne 'master';
$desc{"$repo.git"} = $desc;
$owner{"$repo.git"} = $owner || '';
}
else
{
die "$ABRT can't make head or tail of '$_'\n";
}
}
for my $ig (sort keys %ignored)
{
warn "\n\t\t***** WARNING *****\n" .
"\t$ig.conf attempting to set access for " .
join (", ", sort keys %{ $ignored{$ig} }) . "\n";
}
}
# parse the main config file
parse_conf_file($GL_CONF, 'master');
# parse any delegated fragments
wrap_chdir($GL_ADMINDIR);
for my $fragment_file (glob("conf/fragments/*.conf"))
{
# we already check (elsewhere) that a fragment called "foo" will not try
# to specify access control for a repo whose name is not "foo" or is not
# part of a group called "foo" created by master
# meanwhile, I found a possible attack where the admin for group B creates
# a "convenience" group of (a subset of) his users, and then the admin for
# repo group A (alphabetically before B) adds himself to that same group
# in his own fragment.
# as a result, admin_A now has access to group B repos :(
# so now we lock the groups hash to the value it had after parsing
# "master", and localise any changes to it by this fragment so that they
# don't propagate to the next fragment. Thus, each fragment now has only
# those groups that are defined in "master" and itself
local %groups = %groups;
my $fragment = $fragment_file;
$fragment =~ s/^conf\/fragments\/(.*).conf$/$1/;
parse_conf_file($fragment_file, $fragment);
}
my $compiled_fh = wrap_open( ">", $GL_CONF_COMPILED );
my $dumped_data = Data::Dumper->Dump([\%repos], [qw(*repos)]);
# the dump uses single quotes, but we convert any strings containing $creater,
# $readers, $writers, to double quoted strings. A wee bit sneaky, but not too
# much...
$dumped_data =~ s/'(?=[^']*\$(?:creater|readers|writers|gl_user))~?(.*?)'/"$1"/g;
print $compiled_fh $dumped_data;
close $compiled_fh or die "$ABRT close compiled-conf failed: $!\n";
# ----------------------------------------------------------------------------
# any new repos to be created?
# ----------------------------------------------------------------------------
# modern gits allow cloning from an empty repo, so we just create it. Gitosis
# did not have that luxury, so it was forced to detect the first push and
# create it then
# but it turns out not everyone has "modern" gits :)
my $git_version = `git --version`;
my ($gv_maj, $gv_min, $gv_patchrel) = ($git_version =~ m/git version (\d+)\.(\d+)\.(\d+)/);
die "$ABRT I can't understand $git_version\n" unless ($gv_maj >= 1);
$git_version = $gv_maj*10000 + $gv_min*100 + $gv_patchrel; # now it's "normalised"
# repo-base needs to be an absolute path for this loop to work right
# so if it was not already absolute, prefix $HOME.
my $repo_base_abs = ( $REPO_BASE =~ m(^/) ? $REPO_BASE : "$ENV{HOME}/$REPO_BASE" );
wrap_chdir("$repo_base_abs");
for my $repo (sort keys %repos) {
next unless $repo =~ $REPONAME_PATT;
next if $repo =~ m(^EXTCMD/); # these are not real repos
next if $repo eq '@all';
unless (-d "$repo.git") {
print STDERR "creating $repo...\n";
new_repo($repo, "$GL_ADMINDIR/hooks/common");
# new_repo would have chdir'd us away; come back
wrap_chdir("$repo_base_abs");
}
# when repos are copied over from elsewhere, one had to run easy install
# once again to make the new (OS-copied) repo contain the proper update
# hook. Perhaps we can make this easier now, and eliminate the easy
# install, with a quick check (and a new, empty, "hook" as a sentinel)
unless (-l "$repo.git/hooks/gitolite-hooked") {
ln_sf("$GL_ADMINDIR/hooks/common", "*", "$repo.git/hooks");
# in case of package install, GL_ADMINDIR is no longer the top cop;
# override with the package hooks
ln_sf("$GL_PACKAGE_HOOKS/common", "*", "$repo.git/hooks") if $GL_PACKAGE_HOOKS;
}
}
warn "\n\t\t***** WARNING *****\n" .
"\tyour git version is older than 1.6.2\n" .
"\tgitolite will work but you MUST read the section on\n" .
"\t\"git version dependency\" in doc/3-faq-tips-etc.mkd\n"
if $git_version < 10602; # that's 1.6.2 to you
# ----------------------------------------------------------------------------
# update repo configurations
# ----------------------------------------------------------------------------
for my $repo (keys %repo_config) {
wrap_chdir("$repo_base_abs/$repo.git");
while ( my ($key, $value) = each(%{ $repo_config{$repo} }) ) {
if ($value) {
$value =~ s/^"(.*)"$/$1/;
system("git", "config", $key, $value);
} else {
system("git", "config", "--unset-all", $key);
}
}
}
# ----------------------------------------------------------------------------
# handle gitweb and daemon
# ----------------------------------------------------------------------------
# How you specify gitweb and daemon access is quite different from gitosis. I
# just assume you'll never have any *real* users called "gitweb" or "daemon"
# :-) These are now "pseduo users" -- giving them "R" access to a repo is all
# you have to do
wrap_chdir("$repo_base_abs");
# daemons first...
for my $repo (sort keys %repos) {
next unless $repo =~ $REPONAME_PATT;
my $export_ok = "$repo.git/git-daemon-export-ok";
if ($repos{$repo}{'R'}{'daemon'}) {
system("touch $export_ok");
} else {
unlink($export_ok);
}
}
my %projlist = ();
# ...then gitwebs
for my $repo (sort keys %repos) {
next unless $repo =~ $REPONAME_PATT;
my $desc_file = "$repo.git/description";
# note: having a description also counts as enabling gitweb
if ($repos{$repo}{'R'}{'gitweb'} or $desc{"$repo.git"}) {
$projlist{"$repo.git"} = 1;
# add the description file; no messages to user or error checking :)
$desc{"$repo.git"} and open(DESC, ">", $desc_file) and print DESC $desc{"$repo.git"} . "\n" and close DESC;
if ($owner{"$repo.git"}) {
# set the repository owner
system("git", "--git-dir=$repo.git", "config", "gitweb.owner", $owner{"$repo.git"});
} else {
# remove the repository owner setting
system("git --git-dir=$repo.git config --unset-all gitweb.owner 2>/dev/null");
}
} else {
# delete the description file; no messages to user or error checking :)
unlink $desc_file;
# remove the repository owner setting
system("git --git-dir=$repo.git config --unset-all gitweb.owner 2>/dev/null");
}
# unless there are other gitweb.* keys set, remove the section to keep the
# config file clean
my $keys = `git --git-dir=$repo.git config --get-regexp '^gitweb\\.' 2>/dev/null`;
if (length($keys) == 0) {
system("git --git-dir=$repo.git config --remove-section gitweb 2>/dev/null");
}
}
# update the project list
my $projlist_fh = wrap_open( ">", $PROJECTS_LIST);
for my $proj (sort keys %projlist) {
print $projlist_fh "$proj\n";
}
close $projlist_fh;
# ----------------------------------------------------------------------------
# "compile" ssh authorized_keys
# ----------------------------------------------------------------------------
my $authkeys_fh = wrap_open( "<", $ENV{HOME} . "/.ssh/authorized_keys",
"\tFor security reasons, gitolite will not *create* this file if it does\n" .
"\tnot already exist. Please see the \"admin\" document for details\n");
my $newkeys_fh = wrap_open( ">", $ENV{HOME} . "/.ssh/new_authkeys" );
# save existing authkeys minus the GL-added stuff
while (<$authkeys_fh>)
{
print $newkeys_fh $_ unless (/^# gito(sis-)?lite start/../^# gito(sis-)?lite end/);
}
# add our "start" line, each key on its own line (prefixed by command and
# options, in the standard ssh authorized_keys format), then the "end" line.
print $newkeys_fh "# gitolite start\n";
wrap_chdir($GL_KEYDIR);
for my $pubkey (`find . -type f`)
{
chomp($pubkey); $pubkey =~ s(^\./)();
# security check (thanks to divVerent for catching this)
unless ($pubkey =~ $REPONAME_PATT) {
print STDERR "$pubkey contains some unsavoury characters; ignored...\n";
next;
}
# lint check 1
unless ($pubkey =~ /\.pub$/)
{
print STDERR "WARNING: pubkey files should end with \".pub\", ignoring $pubkey\n";
next;
}
my $user = $pubkey;
$user =~ s(.*/)(); # foo/bar/baz.pub -> baz.pub
$user =~ s/(\@[^.]+)?\.pub$//; # baz.pub, baz@home.pub -> baz
# lint check 2
print STDERR "WARNING: pubkey $pubkey exists but user $user not in config\n"
unless $user_list{$user};
$user_list{$user} = 'has pubkey';
# apparently some pubkeys don't end in a newline...
my $pubkey_content = `cat $pubkey`;
$pubkey_content =~ s/\s*$/\n/;
# don't trust files with multiple lines (i.e., something after a newline)
if ($pubkey_content =~ /\n./)
{
print STDERR "WARNING: a pubkey file can only have one line (key); ignoring $pubkey\n";
next;
}
print $newkeys_fh "command=\"$AUTH_COMMAND $user\",$AUTH_OPTIONS,no-pty ";
print $newkeys_fh $pubkey_content;
}
# lint check 3; a little more severe than the first two I guess...
for my $user (sort keys %user_list)
{
next if $user =~ /^(gitweb|daemon|\@all|~\$creater|\$readers|\$writers)$/ or $user_list{$user} eq 'has pubkey';
print STDERR "$WARN user $user in config, but has no pubkey!\n";
}
print $newkeys_fh "# gitolite end\n";
close $newkeys_fh or die "$ABRT close newkeys failed: $!\n";
# all done; overwrite the file (use cat to avoid perm changes)
system("cat $ENV{HOME}/.ssh/authorized_keys > $ENV{HOME}/.ssh/old_authkeys");
system("cat $ENV{HOME}/.ssh/new_authkeys > $ENV{HOME}/.ssh/authorized_keys")
and die "couldn't write authkeys file\n";
system("rm $ENV{HOME}/.ssh/new_authkeys");
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