cd01bb5297
- don't update authkeys if parse fails
(done by moving that code so it runs *after* the parse)
- check group/usernames for sanity
246 lines
7.6 KiB
Perl
Executable file
246 lines
7.6 KiB
Perl
Executable file
#!/usr/bin/perl -w
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use strict;
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use Data::Dumper;
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# === add-auth-keys ===
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# part of the gitosis-lite (GL) suite
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# (1) - "compiles" ~/.ssh/authorized_keys from the list of pub-keys
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# (2) - also "compiles" the user-friendly GL conf file into something easier
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# to parse. We're doing this because both the gl-auth-command and the
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# (gl-)update hook need this, and it seems easier to do this than
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# replicate the parsing code in both those places. As a bonus, it's
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# probably more efficient.
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# how run: manual, by GL admin
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# when:
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# - anytime a pubkey is added/deleted
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# - anytime gitosis-lite.conf is changed
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# input:
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# - GL_CONF (default: ~/.gitosis-lite/gitosis-lite.conf)
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# - GL_KEYDIR (default: ~/.gitosis-lite/keydir)
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# output:
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# - ~/.ssh/authorized_keys (dictated by sshd)
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# - GL_CONF_COMPILED (default: ~/.gitosis-lite/gitosis-lite.conf-compiled.pm)
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# security:
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# - touches a very critical system file that manages the restrictions on
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# incoming users. Be sure to audit AUTH_COMMAND and AUTH_OPTIONS (see
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# below) on any change to this script
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# - no security checks within program. The GL admin runs this manually
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# warnings:
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# - if the "start" line exists, but the "end" line does not, you lose the
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# rest of the existing authkey file. In general, "don't do that (TM)",
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# but we do have a "vim -d" popping up so you can see the changes being
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# made, just in case...
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# ----------------------------------------------------------------------------
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# common definitions
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# ----------------------------------------------------------------------------
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our $GL_ADMINDIR;
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our $GL_CONF;
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our $GL_KEYDIR;
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our $GL_CONF_COMPILED;
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our $REPO_BASE;
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my $glrc = $ENV{HOME} . "/.gitosis-lite.rc";
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unless (my $ret = do $glrc)
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{
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die "parse $glrc failed: $@" if $@;
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die "couldn't do $glrc: $!" unless defined $ret;
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die "couldn't run $glrc" unless $ret;
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}
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# ----------------------------------------------------------------------------
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# definitions specific to this program
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# ----------------------------------------------------------------------------
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# command and options for authorized_keys
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our $AUTH_COMMAND="$GL_ADMINDIR/gl-auth-command";
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our $AUTH_OPTIONS="no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty";
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our $USERNAME_PATT=qr(^\@?[0-9a-zA-Z][0-9a-zA-Z._-]*$); # very simple pattern
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our %groups = ();
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our %repos = ();
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# ----------------------------------------------------------------------------
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# subroutines
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# ----------------------------------------------------------------------------
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sub my_chdir
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{
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chdir($_[0]) or die "chdir $_[0] failed: $!";
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}
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sub expand_userlist
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{
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my @list = @_;
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my @new_list = ();
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for my $item (@list)
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{
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die "bad user $item\n" unless $item =~ $USERNAME_PATT;
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if ($item =~ /^@/) # nested group
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{
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die "undefined group $item" unless $groups{$item};
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# add those names to the list
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push @new_list, @{ $groups{$item} };
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}
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else
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{
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push @new_list, $item;
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}
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}
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return @new_list;
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}
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# ----------------------------------------------------------------------------
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# "compile" GL conf
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# ----------------------------------------------------------------------------
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open(INF, "<", $GL_CONF)
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or die "open GL conf failed: $!";
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# the syntax is fairly simple, so we parse it inline
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my @repos;
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while (<INF>)
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{
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# normalise whitespace; keeps later regexes very simple
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s/=/ = /;
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s/\s+/ /g;
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s/^ //;
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s/ $//;
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# kill comments
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s/#.*//;
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# and blank lines
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next unless /\S/;
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# user groups
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if (/^(@\S+) = (.*)/)
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{
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push @{ $groups{$1} }, expand_userlist( split(' ', $2) );
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die "bad group $1\n" unless $1 =~ $USERNAME_PATT;
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}
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# repo(s)
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elsif (/^repo (.*)/)
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{
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@repos = split(' ', $1);
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}
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# actual permission line
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elsif (/^(R|RW|RW\+) (.* )?= (.+)/)
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{
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# split perms to separate out R, W, and +
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my @perms = split //, $1;
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my @refs; @refs = split(' ', $2) if $2;
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my @users = split ' ', $3;
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# if no ref is given, this PERM applies to all refs
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@refs = qw(refs/.*) unless @refs;
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# fully qualify refs that dont start with "refs/"; prefix them with
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# "refs/heads/"
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@refs = map { m(^refs/) or s(^)(refs/heads/); $_ } @refs;
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# expand the user list, unless it is just "@all"
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@users = expand_userlist ( @users )
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unless (@users == 1 and $users[0] eq '@all');
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# ok, we can finally populate the %repos hash
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for my $repo (@repos) # each repo in the current stanza
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{
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for my $perm (@perms)
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{
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for my $user (@users)
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{
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push @{ $repos{$repo}{$perm}{$user} }, @refs;
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}
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}
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}
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}
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else
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{
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die "can't make head or tail of '$_'\n";
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}
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}
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open(OUT, ">", $GL_CONF_COMPILED)
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or die "open GL conf compiled failed: $!";
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print OUT Data::Dumper->Dump([\%repos], [qw(*repos)]);
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close(OUT);
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# ----------------------------------------------------------------------------
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# any new repos created?
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# ----------------------------------------------------------------------------
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# modern gits allow cloning from an empty repo, so we just create it. Gitosis
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# did not have that luxury, so it was forced to detect the first push and
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# create it then
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umask(0077);
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my_chdir("$ENV{HOME}/$REPO_BASE");
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for my $repo (keys %repos)
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{
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unless (-d "$repo.git")
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{
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mkdir("$repo.git") or die "mkdir $repo.git failed: $!";
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my_chdir("$repo.git");
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system("git init --bare");
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system("cp $GL_ADMINDIR/update-hook.pl hooks/update");
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system("chmod 755 hooks/update");
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my_chdir("$ENV{HOME}/$REPO_BASE");
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}
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}
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# ----------------------------------------------------------------------------
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# "compile" ssh authorized_keys
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# ----------------------------------------------------------------------------
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open(INF, "<", $ENV{HOME} . "/.ssh/authorized_keys") or die "open old authkeys failed: $!";
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open(OUT, ">", $ENV{HOME} . "/.ssh/new_authkeys") or die "open new authkeys failed: $!";
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# save existing authkeys minus the GL-added stuff
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while (<INF>)
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{
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print OUT unless (/^# gitosis-lite start/../^# gitosis-lite end/);
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}
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# add our "start" line, each key on its own line (prefixed by command and
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# options, in the standard ssh authorized_keys format), then the "end" line.
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print OUT "# gitosis-lite start\n";
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my_chdir($GL_KEYDIR);
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for my $pubkey (glob("*.pub"))
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{
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my $user = $pubkey; $user =~ s/\.pub$//;
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print OUT "command=\"$AUTH_COMMAND $user\",$AUTH_OPTIONS ";
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print OUT `cat $pubkey`;
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}
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print OUT "# gitosis-lite end\n";
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close(OUT);
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# check what changes are being made; just a comfort factor
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# system("vim -d ~/.ssh/authorized_keys ~/.ssh/new_authkeys");
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# all done; overwrite the file (use cat to avoid perm changes)
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system("cat ~/.ssh/new_authkeys > ~/.ssh/authorized_keys");
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system("rm ~/.ssh/new_authkeys");
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# if the gl admin directory (~/.gitosis-lite) is itself a git repo, do an
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# autocheckin. nothing fancy; this is a "just in case" type of thing.
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my_chdir($GL_ADMINDIR);
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if (-d ".git")
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{
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system("git add -A keydir"); # stage all changes in keydir
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# and if there are any
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if (system("git diff --cached --quiet") )
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{
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open(COMMIT, "|-", "git commit -F -")
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or die "pipe commit failed: $!";
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print COMMIT "keydir changed\n\n";
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print COMMIT `git diff --cached --name-status`;
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close(COMMIT) or die "close commit failed: $!";
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}
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}
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