(sskm) self-service key management -- new adc
based on a discussion with Jeff from the KDE team; see doc for more.
This commit is contained in:
Sitaram Chamarty
parent
a6a0db10e9
commit
9e01778796
266
contrib/adc/sskm
Executable file
266
contrib/adc/sskm
Executable file
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@ -0,0 +1,266 @@
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#!/usr/bin/perl
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use strict;
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use warnings;
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die "ENV GL_RC not set\n" unless $ENV{GL_RC};
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die "ENV GL_BINDIR not set\n" unless $ENV{GL_BINDIR};
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# pull in modules we need
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unshift @INC, $ENV{GL_BINDIR};
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require gitolite_rc or die "parse gitolite_rc.pm failed\n";
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gitolite_rc->import;
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require gitolite or die "parse gitolite.pm failed\n";
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gitolite->import;
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# get to the keydir
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die "keydir not accessible\n" unless -d $gitolite_rc::GL_KEYDIR;
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chdir($gitolite_rc::GL_KEYDIR);
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# save arguments for later
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my $operation = shift || 'list';
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my $keyid = shift || '';
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# keyid must fit a very specific pattern
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$keyid and $keyid !~ /^@[-0-9a-z_]+$/i and die "invalid keyid $keyid\n";
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# get the actual userid and keytype
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my $gl_user = $ENV{GL_USER};
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my $keytype = '';
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$keytype = $1 if $gl_user =~ s/^zzz-marked-for-(...)-//;
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print STDERR "hello $gl_user, you are currently using " .
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($keytype ? "a key in the 'marked for $keytype' state\n"
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: "a normal (\"active\") key\n" );
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# ----
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# first collect the keys
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my (@pubkeys, @marked_for_add, @marked_for_del);
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# get the list of pubkey files for this user, including pubkeys marked for
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# add/delete
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for my $pubkey (`find . -type f -name "*.pub" | sort`) {
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chomp($pubkey);
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$pubkey =~ s(^./)(); # artifact of the find command
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my $user = $pubkey;
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$user =~ s(.*/)(); # foo/bar/baz.pub -> baz.pub
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$user =~ s/(\@[^.]+)?\.pub$//; # baz.pub, baz@home.pub -> baz
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next unless $user eq $gl_user or $user =~ /^zzz-marked-for-...-$gl_user/;
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if ($user =~ m(^zzz-marked-for-add-)) {
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push @marked_for_add, $pubkey;
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} elsif ($user =~ m(^zzz-marked-for-del-)) {
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push @marked_for_del, $pubkey;
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} else {
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push @pubkeys, $pubkey;
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}
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}
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# ----
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# list mode; just do it and exit
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sub print_keylist {
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my ($message, @list) = @_;
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return unless @list;
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print "== $message ==\n";
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my $count=1;
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for (@list) {
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my $fp = fingerprint($_);
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s/zzz-marked(\/|-for-...-)//g;
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print $count++ . ": $fp : $_\n";
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}
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}
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if ($operation eq 'list') {
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print "you have the following keys:\n";
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print_keylist("active keys", @pubkeys);
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print_keylist("keys marked for addition/replacement", @marked_for_add);
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print_keylist("keys marked for deletion", @marked_for_del);
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print "\n\n";
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exit;
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}
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# ----
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# please see docs for details on how a user interacts with this
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if ($keytype eq '') {
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# user logging in with a normal key
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die "valid operations: add, del, undo-add, confirm-del\n" unless $operation =~ /^(add|del|confirm-del|undo-add)$/;
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if ($operation eq 'add') {
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print STDERR "please supply the new key on STDIN. (I recommend you
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don't try to do this interactively, but use a pipe)\n";
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kf_add($gl_user, $keyid, safe_stdin());
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} elsif ($operation eq 'del') {
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kf_del($gl_user, $keyid);
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} elsif ($operation eq 'confirm-del') {
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die "you dont have any keys marked for deletion\n" unless @marked_for_del;
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kf_confirm_del($gl_user, $keyid);
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} elsif ($operation eq 'undo-add') {
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die "you dont have any keys marked for addition\n" unless @marked_for_add;
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kf_undo_add($gl_user, $keyid);
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}
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} elsif ($keytype eq 'del') {
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# user is using a key that was marked for deletion. The only possible use
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# for this is that she changed her mind for some reason (maybe she marked
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# the wrong key for deletion) or is not able to get her client-side sshd
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# to stop using this key
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die "valid operations: undo-del\n" unless $operation eq 'undo-del';
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# reinstate the key
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kf_undo_del($gl_user, $keyid);
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} elsif ($keytype eq 'add') {
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die "valid operations: confirm-add\n" unless $operation eq 'confirm-add';
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# user is trying to validate a key that has been previously marked for
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# addition. This isn't interactive, but it *could* be... if someone asked
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kf_confirm_add($gl_user, $keyid);
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}
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exit;
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# ----
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# make a temp clone and switch to it
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our $TEMPDIR;
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BEGIN { $TEMPDIR=`mktemp -d -t tmp.XXXXXXXXXX`; }
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END { `/bin/rm -rf $TEMPDIR`; }
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sub cd_temp_clone {
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chomp($TEMPDIR);
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system("git clone $ENV{GL_REPO_BASE_ABS}/gitolite-admin.git $TEMPDIR");
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chdir($TEMPDIR);
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system("git config --get user.email || git config user.email \$USER@`hostname`");
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system("git config --get user.name || git config user.name \"\$USER on `hostname`\"");
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}
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sub fingerprint {
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my $fp = `ssh-keygen -l -f $_[0]`;
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die "does not seem to be a valid pubkey\n" unless $fp =~ /(([0-9a-f]+:)+[0-9a-f]+ )/i;
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return $1;
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}
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sub safe_stdin {
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# read one line from STDIN
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my $data;
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my $ret = read STDIN, $data, 4096;
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# current pubkeys are approx 400 bytes so we go a little overboard
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die "could not read pubkey data" . (defined($ret) ? "" : ": $!") . "\n" unless $ret;
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die "pubkey data seems to have more than one line\n" if $data =~ /\n./;
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return $data;
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}
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sub highlander {
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# there can be only one
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my($keyid, @a) = @_;
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# too many?
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if (@a > 1) {
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print STDERR "
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more than one key satisfies this condition, and I can't deal with that!
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The keys are:
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";
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print STDERR "\t" . join("\n\t", @a), "\n\n";
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exit 1;
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}
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# too few?
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die "no keys with " . ($keyid || "empty") . " keyid found\n" unless @a;
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return @a;
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}
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sub kf_add {
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my($gl_user, $keyid, $keymaterial) = @_;
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# add a new "marked for addition" key for $gl_user.
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cd_temp_clone();
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chdir("keydir");
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mkdir("zzz-marked");
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wrap_print("zzz-marked/zzz-marked-for-add-$gl_user$keyid.pub", $keymaterial);
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system("git", "add", ".") and die "git add failed\n";
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my $fp = fingerprint("zzz-marked/zzz-marked-for-add-$gl_user$keyid.pub");
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system("git", "commit", "-m", "sskm: add $gl_user$keyid ($fp)") and die "git commit failed\n";
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system("env", "GL_BYPASS_UPDATE_HOOK=1", "git", "push") and die "git push failed\n";
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}
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sub kf_confirm_add {
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my($gl_user, $keyid) = @_;
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# find entries in both @pubkeys and @marked_for_add whose basename matches $gl_user$keyid
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my @pk = highlander($keyid, grep { m(^(.*/)?$gl_user$keyid.pub$) } @pubkeys);
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my @mfa = highlander($keyid, grep { m(^zzz-marked/zzz-marked-for-add-$gl_user$keyid.pub$) } @marked_for_add);
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cd_temp_clone();
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chdir("keydir");
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my $fp = fingerprint($mfa[0]);
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if ($pk[0]) {
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system("git", "mv", "-f", $mfa[0], $pk[0]);
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system("git", "commit", "-m", "sskm: confirm-add (replace) $pk[0] ($fp)") and die "git commit failed\n";
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} else {
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system("git", "mv", "-f", $mfa[0], "$gl_user$keyid.pub");
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system("git", "commit", "-m", "sskm: confirm-add $gl_user$keyid ($fp)") and die "git commit failed\n";
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}
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system("env", "GL_BYPASS_UPDATE_HOOK=1", "git", "push") and die "git push failed\n";
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}
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sub kf_undo_add {
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# XXX some code at start is shared with kf_confirm_add
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my($gl_user, $keyid) = @_;
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my @mfa = highlander($keyid, grep { m(^zzz-marked/zzz-marked-for-add-$gl_user$keyid.pub$) } @marked_for_add);
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cd_temp_clone();
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chdir("keydir");
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my $fp = fingerprint($mfa[0]);
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system("git", "rm", $mfa[0]);
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system("git", "commit", "-m", "sskm: undo-add $gl_user$keyid ($fp)") and die "git commit failed\n";
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system("env", "GL_BYPASS_UPDATE_HOOK=1", "git", "push") and die "git push failed\n";
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}
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sub kf_del {
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my($gl_user, $keyid) = @_;
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cd_temp_clone();
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chdir("keydir");
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mkdir("zzz-marked");
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my @pk = highlander($keyid, grep { m(^(.*/)?$gl_user$keyid.pub$) } @pubkeys);
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my $fp = fingerprint($pk[0]);
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system("git", "mv", $pk[0], "zzz-marked/zzz-marked-for-del-$gl_user$keyid.pub") and die "git mv failed\n";
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system("git", "commit", "-m", "sskm: del $pk[0] ($fp)") and die "git commit failed\n";
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system("env", "GL_BYPASS_UPDATE_HOOK=1", "git", "push") and die "git push failed\n";
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}
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sub kf_confirm_del {
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my($gl_user, $keyid) = @_;
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my @mfd = highlander($keyid, grep { m(^zzz-marked/zzz-marked-for-del-$gl_user$keyid.pub$) } @marked_for_del);
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cd_temp_clone();
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chdir("keydir");
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my $fp = fingerprint($mfd[0]);
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system("git", "rm", $mfd[0]);
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system("git", "commit", "-m", "sskm: confirm-del $gl_user$keyid ($fp)") and die "git commit failed\n";
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system("env", "GL_BYPASS_UPDATE_HOOK=1", "git", "push") and die "git push failed\n";
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}
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sub kf_undo_del {
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my ($gl_user, $keyid) = @_;
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my @mfd = highlander($keyid, grep { m(^zzz-marked/zzz-marked-for-del-$gl_user$keyid.pub$) } @marked_for_del);
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print STDERR "
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You're undeleting a key that is currently marked for deletion.
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Hit ENTER to undelete this key
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Hit Ctrl-C to cancel the undelete
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Please see documentation for caveats on the undelete process as well as how to
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actually delete it.
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";
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<>; # yeay... always wanted to do that -- throw away user input!
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cd_temp_clone();
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chdir("keydir");
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my $fp = fingerprint($mfd[0]);
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system("git", "mv", "-f", $mfd[0], "$gl_user$keyid.pub" );
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system("git", "commit", "-m", "sskm: undo-del $gl_user$keyid ($fp)") and die "git commit failed\n";
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system("env", "GL_BYPASS_UPDATE_HOOK=1", "git", "push") and die "git push failed\n";
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}
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