87 lines
3.1 KiB
Plaintext
87 lines
3.1 KiB
Plaintext
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#!/usr/bin/perl -w
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use strict;
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# === add-auth-keys ===
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# refreshes ~/.ssh/authorized_keys from the list of pub-keys
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# part of the gitosis-lite (GL) suite
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# how run: manual, by GL admin
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# when: anytime a pubkey is added/deleted
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# (i.e., contents of ~/.gitosis-lite/keydir change)
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# input: ~/.gitosis-lite/keydir
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# output: ~/.ssh/authorized_keys
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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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# robustness:
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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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# other notes:
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# - you do NOT need to run this for permission changes within
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# gitosis-lite.conf, (like giving an *existing* user new rights)
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# - keys are added/deleted from the keystore **manually**, and all keys
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# are named "name.pub"
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# command and options for authorized_keys
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our $AUTH_COMMAND=$ENV{HOME} . "/.gitosis-lite/gl-auth-command";
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our $AUTH_OPTIONS="no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty";
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# quick subroutines
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sub my_chdir
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{
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chdir($_[0]) or die "chdir $_[0] failed: $!";
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}
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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: $!";
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# save existing authkeys minus the GL-added stuff
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while (<INF>)
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{
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print OUT unless (/^# gitosis-lite start/../^# gitosis-lite end/);
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}
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# add our "start" line, each key on its own line (prefixed by command and
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# options, in the standard ssh authorized_keys format), then the "end" line.
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print OUT "# gitosis-lite start\n";
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my_chdir($ENV{HOME} . "/.gitosis-lite/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 $pubkey`;
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}
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print OUT "# gitosis-lite end\n";
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close(OUT);
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# check what changes are being made; just a comfort factor
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system("vim -d ~/.ssh/authorized_keys ~/.ssh/new_authkeys");
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# all done; overwrite the file (use cat to avoid perm changes)
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system("cat ~/.ssh/new_authkeys > ~/.ssh/authorized_keys");
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system("rm ~/.ssh/new_authkeys");
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# if the gl admin directory (~/.gitosis-lite) is itself a git repo, do an
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# autocheckin. nothing fancy; this is a "just in case" type of thing.
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my_chdir($ENV{HOME} . "/.gitosis-lite");
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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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if (! system("git diff --cached --quiet") )
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# and if there are any
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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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