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|
#!/usr/bin/perl
use strict;
use warnings;
# complete rewrite of the sshkeys-lint program. Usage has changed, see
# usage() function or run without arguments.
use Getopt::Long;
my $admin = 0;
my $quiet = 0;
GetOptions('admin|a=s' => \$admin, 'quiet|q' => \$quiet);
use Data::Dumper;
$Data::Dumper::Deepcopy = 1;
$|++;
my $in_gl_section = 0;
my $warnings = 0;
sub dbg {
use Data::Dumper;
for my $i (@_) {
print STDERR "DBG: " . Dumper($i);
}
}
sub msg {
my $warning = shift;
return if $quiet and not $warning;
$warnings++ if $warning;
print "sshkeys-lint: " . ( $warning ? "WARNING: " : "" ) . $_ for @_;
}
@ARGV or not -t or usage();
our @pubkeyfiles = @ARGV; @ARGV = ();
# ------------------------------------------------------------------------
my @authkeys;
my %seen_fprints;
my %pkf_by_fp;
msg 0, "==== checking authkeys file:\n";
fill_authkeys(); # uses up STDIN
if ($admin) {
my $fp = fprint("$admin.pub");
my $fpu = ( $seen_fprints{$fp}{user} || 'no access' );
# dbg("fpu = $fpu, admin=$admin");
die "\t\t*** FATAL ***\n" .
"$admin.pub maps to $fpu, not $admin.\n" .
"You will not be able to access gitolite with this key.\n" .
"Look for the 'ssh troubleshooting' link in http://sitaramc.github.com/gitolite/.\n"
if $fpu ne "user $admin";
}
msg 0, "==== checking pubkeys:\n" if @pubkeyfiles;
for my $pkf (@pubkeyfiles) {
my $fp = fprint($pkf);
msg 1, "$pkf appears to be a COPY of $pkf_by_fp{$fp}\n" if $pkf_by_fp{$fp};
$pkf_by_fp{$fp} ||= $pkf;
my $fpu = ( $seen_fprints{$fp}{user} || 'no access' );
msg 0, "$pkf maps to $fpu\n";
}
if ($warnings) {
print "\n$warnings warnings found\n";
}
exit $warnings;
# ------------------------------------------------------------------------
sub fill_authkeys {
while (<>) {
my $seq = $.;
next if ak_comment($_); # also sets/clears $in_gl_section global
my $fp = fprint($_);
my $user = user($_);
check($seq, $fp, $user);
$authkeys[$seq]{fprint} = $fp;
$authkeys[$seq]{ustatus} = $user;
}
}
sub check {
my ($seq, $fp, $user) = @_;
msg 1, "line $seq, $user key found *outside* gitolite section!\n"
if $user =~ /^user / and not $in_gl_section;
msg 1, "line $seq, $user key found *inside* gitolite section!\n"
if $user !~ /^user / and $in_gl_section;
if ($seen_fprints{$fp}) {
msg 1, "authkeys line $seq ($user) will be ignored by sshd; " .
"same key found on line " .
$seen_fprints{$fp}{seq} . " (" .
$seen_fprints{$fp}{user} . ")\n";
return;
}
$seen_fprints{$fp}{seq} = $seq;
$seen_fprints{$fp}{user} = $user;
}
sub user {
my $user = '';
$user ||= "user $1" if /^command=.*gl-auth-command (.*?)"/;
$user ||= "host $1" if /^command=.*gl-mirror-shell (.*?)"/;
$user ||= "unknown command" if /^command/;
$user ||= "shell access" if /^ssh-(rsa|dss)/;
return $user;
}
sub ak_comment {
local $_ = shift;
$in_gl_section = 1 if /^# gitolite start/;
$in_gl_section = 0 if /^# gitolite end/;
die "gitosis? what's that?\n" if /^#.*gitosis/;
return /^\s*(#|$)/;
}
sub fprint {
local $_ = shift;
my ($fh, $tempfn, $in);
if (/ssh-(dss|rsa) /) {
# an actual key was passed. Since ssh-keygen requires an actual file,
# make a temp file to take the data and pass on to ssh-keygen
s/^.* (ssh-dss|ssh-rsa)/$1/;
use File::Temp qw(tempfile);
($fh, $tempfn) = tempfile();
$in = $tempfn;
print $fh $_;
close $fh;
} else {
# a filename was passed
$in = $_;
}
# dbg("in = $in");
-f $in or die "file not found: $in\n";
open($fh, "ssh-keygen -l -f $in |") or die "could not fork: $!\n";
my $fp = <$fh>;
# dbg("fp = $fp");
close $fh;
unlink $tempfn if $tempfn;
die "fprint failed\n" unless $fp =~ /([0-9a-f][0-9a-f](:[0-9a-f][0-9a-f])+)/;
return $1;
}
# ------------------------------------------------------------------------
sub usage {
print <<EOF;
sshkeys-lint expects
- the contents of an authorized_keys file via STDIN
- one or more pubkey filenames as arguments
sample use to check all keys on gitolite server:
cd ~/.gitolite/keydir
cat ~/.ssh/authorized_keys | sshkeys-lint `find . -name "*.pub"`
# or supply only one pubkey file to check only that:
cat ~/.ssh/authorized_keys | sshkeys-lint YourName.pub
Note that it runs ssh-keygen -l for each line in the authkeys file and each
pubkey in the argument list, so be wary of running it on something huge. This
is meant for troubleshooting.
EOF
exit 1;
}
|
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