gitsig: Re-create the git-gpg instead of providing it

Recreate the gpg home directory instead of packing it in git. It seems
the format is not transferable.

Also, provide maintenance script to refresh the keys (import
revocations, etc).

And move the directory to .git-gpg, so it doesn't bother people.

gitsig/README

@@ -7,7 +7,7 @@ Setup
 -----
 
 All these tools use separate gnupg home with the trusted keys. They expect the
-directory to be $HOME/git-gpg. It may be possible (and better from security
+directory to be $HOME/.git-gpg. It may be possible (and better from security
 point of view) if some of the files weren't writable by the current user, to
 ensure malicious attacker can't add another key into the keyring.
 
@@ -17,7 +17,7 @@ questionable if this adds any level of security, or if the attacker could
 disable the check completely when already in the position to tamper with local
 files.
 
-It is important to check the gpg -k *every time* the git-gpg directory is
+It is important to check the gpg -k *every time* the .git-gpg directory is
 updated (so an attacker couldn't sneak a key into the git repository and wait
 for it to be installed by accident).
 
@@ -35,3 +35,16 @@ Signed tip
 This script simply terminates successfully if the tip of the current branch is
 signed by a trusted key and fails if it is not. It is expected to be run before
 any code from any repository is used.
+
+gen-gpg
+-------
+
+This is a maintainance script. It imports the keys and trust settings from
+files in this directory (trusted_keys.gpg and trust.txt) and creates the
+$HOME/.git-gpg.
+
+gpg-refresh
+-----------
+
+Refresh keys from a keyserver. This will import any revocations or possible new
+signatures on the keys. It is recommended to put into a cron script.

gitsig/gen-gpg

+#!/bin/bash
+
+# Copyright (c) 2015, CZ.NIC, z.s.p.o. (http://www.nic.cz/)
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#    * Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#    * Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#    * Neither the name of the CZ.NIC nor the
+#      names of its contributors may be used to endorse or promote products
+#      derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL CZ.NIC BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -e
+
+export GNUPGHOME=$HOME/.git-gpg
+mkdir -p $GNUPGHOME
+chmod 0700 $GNUPGHOME
+gpg --batch --import trusted_keys.gpg
+gpg --batch --import-ownertrust <trust.txt
+./gpg-refresh
+gpg --batch --check-trustdb
+echo "****************************************"
+echo "* Check the following output manually! *"
+echo "****************************************"
+gpg -k

gitsig/git-gpg/.#lk0x0000000000efaa70.ruth.879

-       879
-ruth

gitsig/git-gpg/crls.d/DIR.txt

-v:1:

gitsig/gpg-refresh

+#!/bin/bash
+
+# Copyright (c) 2015, CZ.NIC, z.s.p.o. (http://www.nic.cz/)
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#    * Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#    * Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in the
+#      documentation and/or other materials provided with the distribution.
+#    * Neither the name of the CZ.NIC nor the
+#      names of its contributors may be used to endorse or promote products
+#      derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL CZ.NIC BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -e
+
+export GNUPGHOME=$HOME/.git-gpg
+gpg --keyserver hkp://pgp.mit.edu --refresh-keys

gitsig/signed_tip

@@ -25,5 +25,5 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-export GNUPGHOME=$HOME/git-gpg
+export GNUPGHOME=$HOME/.git-gpg
 git log -n1 --pretty="%G?" | grep -qF 'G'

gitsig/trust.txt

+# List of assigned trustvalues, created Tue 08 Dec 2015 01:10:13 PM CET
+# (Use "gpg --import-ownertrust" to restore them)
+EB7F8CD1A01B184215D86E0FEFFA16C329C1DDB2:2:
+460B4CF5E995864B71D719B78CB80BB7F8233AEA:6:

gitsig/unsigned_detect.pl

@@ -30,12 +30,12 @@ use Storable qw(store retrieve);
 
 # Configure where the gpg directory with trusted keys to sign git commits lives.
 # Then run the git-log command that reads and checks the signatures on commits.
-$ENV{GNUPGHOME} = "$ENV{HOME}/git-gpg";
+$ENV{GNUPGHOME} = "$ENV{HOME}/.git-gpg";
 open my $cmd, '-|', 'git', 'log', '--pretty=%H %G? %ae %ce %s' or die "Couldn't run the git log command: $!\n";
 
 # Read cache of known commits, but don't fail if the file is not there
 my $known_commits = {};
-my $cache_file = "$ENV{HOME}/git-gpg/known_commits";
+my $cache_file = "$ENV{HOME}/.git-gpg/known_commits";
 eval { $known_commits = retrieve $cache_file };
 
 # Regular expression of addresses of people who must sign their commits.