Reimplement in Perl
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cassh.pl
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299
cassh.pl
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#!/usr/bin/env perl
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# cassh - Manager for an OpenSSH Certification Authority
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#
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# Written in 2022 by Lucas
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#
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# To the extent possible under law, the author(s) have dedicated all
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# copyright and related and neighboring rights to this software to the
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# public domain worldwide. This software is distributed without any
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# warranty.
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# You should have received a copy of the CC0 Public Domain Dedication
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# along with this software. If not, see
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# <http://creativecommons.org/publicdomain/zero/1.0/>.
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use v5.14;
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use strict;
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use warnings;
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package SerialFile v1.0.0;
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use overload '0+' => \&value;
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sub new ($$)
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{
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my $class = shift;
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my $self = {};
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bless $self, $class;
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return $self->_init(@_);
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}
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sub _init ($$)
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{
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my ($self, $file) = @_;
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my $mode = -f $file ? "+<" : ">";
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open(my $fh, $mode, $file) or die "can't open $file: $!";
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my @lines = <$fh>;
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my $counter;
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if (@lines == 0) {
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$counter = 0;
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} elsif (@lines == 1 && $lines[0] =~ /^(\d+)$/) {
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$counter = $1;
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} else {
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return undef;
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}
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$self->{_fh} = $fh;
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$self->{_counter} = $counter;
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return $self;
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}
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sub inc ($;$)
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{
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use integer;
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my ($self, $inc) = @_;
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$self->{_counter} += $inc // 1;
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return $self;
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}
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sub value ($)
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{
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my $self = shift;
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return $self->{_counter};
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}
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sub commit ($)
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{
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my $self = shift;
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truncate($self->{_fh}, 0) or return 0;
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seek($self->{_fh}, 0, 0) or return 0;
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return say {$self->{_fh}} $self->value();
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}
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sub DESTROY ($)
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{
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local ($., $@, $!, $^E, $?);
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my $self = shift;
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close($self->{_fh});
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}
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package FormatToken v1.0.0;
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use List::Util qw(all);
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sub new ($)
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{
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return bless {_tokens => {"%" => "%"}}, shift;
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}
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sub register ($;%)
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{
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my ($self, %pairs) = @_;
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for (keys %pairs) {
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die "can't register $_" if !/^[A-Za-z]$/;
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$self->{_tokens}->{$_} = $pairs{$_};
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}
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return $self;
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}
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sub deregister ($;%)
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{
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my ($self, %pairs) = @_;
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delete $self->{_tokens}->{$_} for (keys %pairs);
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return $self;
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}
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sub format ($$)
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{
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my ($self, $in) = @_;
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die "can't format \"$in\"" unless
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all {defined $self->{_tokens}->{$_}} ($in =~ /%([A-Za-z%])/g);
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return $in =~ s/%([A-Za-z%])/$self->{_tokens}->{$1}/egr;
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}
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package main;
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use Getopt::Long qw(:config posix_default bundling no_ignore_case);
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my $PATH_CA_PUB = "./ca.pub";
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my $PATH_CA_SERIAL = "./serial.txt";
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my $PATH_PUBKEYS_DIR = "./pubkeys";
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my %COMMANDS = (
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issue => \&main_issue,
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mkfile => \&main_mkfile,
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);
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my $PROGNAME = ($0 =~ s,.*/,,r);
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sub usage ()
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{
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print STDERR <<EOF;
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Usage:
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$PROGNAME issue [-hqv] [-I key_id] [-n principals]
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[-V validity_interval]
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$PROGNAME mkfile authorized_keys [options ...]
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$PROGNAME mkfile known_hosts [hostnames ...]
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EOF
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exit 1;
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}
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sub err (@)
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{
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say STDERR "$PROGNAME: @_";
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exit 1;
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}
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sub slurp ($)
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{
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my $f = shift;
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open(my $fh, "<", $f) or err "can't open $f";
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local $/;
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my $s = <$fh>;
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close($fh);
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return $s;
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}
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# Returns comment from the ssh-agent if any is returned, otherwise it
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# returns the public key's fingerprint.
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sub get_ca_sk_comment_from_pk ($)
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{
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my $f = shift;
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my ($fh, @ssh_keygen_lines, @ssh_add_lines);
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open($fh, "-|", "ssh-keygen", "-l", "-f", $f) or err "can't fork: $!";
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@ssh_keygen_lines = <$fh>;
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close($fh);
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open($fh, "-|", "ssh-add", "-l") or err "can't fork: $!";
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@ssh_add_lines = <$fh>;
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close($fh);
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my $comment;
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OUTER: foreach my $ssh_keygen_line (@ssh_keygen_lines) {
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chomp($ssh_keygen_line);
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my @ssh_keygen_parts = split(/ /, $ssh_keygen_line, 3);
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foreach my $ssh_add_line (@ssh_add_lines) {
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chomp($ssh_add_line);
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my @ssh_add_parts = split(/ /, $ssh_add_line, 3);
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if ($ssh_keygen_parts[1] eq $ssh_add_parts[1]) {
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my $s = $ssh_add_parts[2];
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$comment = substr($s, 0, rindex($s, " "));
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last OUTER;
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}
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}
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}
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return $comment;
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}
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sub get_pubkeys_files ($)
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{
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my $d = shift;
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opendir(my $dh, "$d") or err "can't open directory $d";
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my @files = map {"$d/$_"}
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grep {-f "$d/$_" && /\.pub$/ && !/-cert\.pub/} readdir($dh);
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closedir($dh);
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return @files;
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}
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sub main_issue ()
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{
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my ($host, $key_id_fmt, $principals_fmt, $quiet, $verbose,
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$validity_interval);
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$validity_interval = "always:forever";
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$key_id_fmt = "%C/%f";
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$verbose = 0;
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GetOptions(
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"h" => \$host,
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"I=s" => \$key_id_fmt,
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"n=s" => \$principals_fmt,
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"q" => \$quiet,
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"v+" => \$verbose,
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"V=s" => \$validity_interval,
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) or usage;
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usage if @ARGV != 0;
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my ($hflag, $qflag, $vflag);
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$hflag = "-h" if defined($host);
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$qflag = "-q" if defined($quiet);
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$vflag = "-" . ("v" x $verbose) if $verbose > 0;
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my @files = get_pubkeys_files($PATH_PUBKEYS_DIR);
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exit 0 if @files == 0;
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my $formatter = FormatToken->new();
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my $ca_sk_comment = get_ca_sk_comment_from_pk($PATH_CA_PUB) // "cassh";
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$formatter->register(C => $ca_sk_comment);
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my $serial = SerialFile->new($PATH_CA_SERIAL);
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# Doing individual calls to ssh-keygen allows for using the filename as
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# a token in principals and key_id format.
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foreach my $file (@files) {
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$formatter->register(f => $file =~ s,.*/(.*)\.pub$,$1,r);
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my ($key_id, $principals);
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$key_id = $formatter->format($key_id_fmt);
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$principals = $formatter->format($principals_fmt) if
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defined($principals_fmt);
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my @cmdopts = ("-I", $key_id, "-U", "-s", $PATH_CA_PUB,
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"-V", $validity_interval, "-z", $serial);
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push(@cmdopts, "-h") if defined($host);
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push(@cmdopts, $qflag) if defined($qflag);
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push(@cmdopts, $vflag) if defined($vflag);
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push(@cmdopts, "-n", $principals) if defined($principals);
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system("ssh-keygen", @cmdopts, $file);
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if ($? == -1) {
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err "ssh-keygen: $!";
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} elsif ($? != 0) {
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exit $? >> 8;
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}
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$serial->inc()->commit() or err "can't save serial";
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}
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}
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sub main_mkfile ()
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{
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usage if @ARGV < 1;
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my $file = shift @ARGV;
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err "no $PATH_CA_PUB found" if ! -f $PATH_CA_PUB;
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if ($file eq "authorized_keys") {
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print join(" ", join(",", "cert-authority", @ARGV),
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slurp($PATH_CA_PUB));
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} elsif ($file eq "known_hosts") {
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print join(" ", grep {$_ ne ""} ('@cert-authority',
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join(",", @ARGV), slurp($PATH_CA_PUB)));
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} else {
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err "unknown file $file";
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}
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}
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sub main ()
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{
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usage if @ARGV < 1;
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my $cmd = shift @ARGV;
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usage if !defined($COMMANDS{$cmd});
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$COMMANDS{$cmd}->();
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}
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main();
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