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#!/bin/bash
# parabola-keys - detect problems and inconsistencies
#
# This file is part of Parabola Libretools.
# Copyright 2020-2021 bill-auger <bill-auger@programmer.net>
#
# Libretools is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Libretools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Libretools. If not, see <https://www.gnu.org/licenses/>.
#
#
# DESCRIPTION:
#
# this script depends on the 'parabola-hackers' package
# TODO: it should probably be moved into the 'parabola-hackers' package
#
# if any problems are reported, other than 'WarningKeys' or 'OutdatedKeys',
# the 'parabola-keyring' package should be rebuilt with high-priority
# 'OutdatedKeys' may or may not indicate a probelm,
# and require manual inspection, as these have bypassed all other checks
#
# the 'parabola-keyring' keys are loaded/refreshed into the local user GPG keyring,
# directly from a keyserver, independent of the 'pacman-keyring' keyring
# then compared to the state of the pristine 'pacman-keyring' keyring
# in that way, edge cases can be detected,
# which could be resolved with `pacman-key --refresh`,
# but which may be blocking installs/upgrades otherwise
# in that way, problems are detected, which would block some installs/upgrades
# and also certain edge cases, which could be resolved with `pacman-key --refresh`,
# such as expiry extension after the last 'parabola-keyring' package build,
# but which may nonetheless be blocking installs/upgrades for some users
# optimal accuracy depends on a pristine system pacman keyring (/etc/pacman.d/gnupg/)
# (ie: it _not_ been refreshed explicitly, since the last 'parabola-keyring' upgrade)
#
#
# OPTIONS:
#
# --all
# list all keys, including those without problems ('ValidKeys')
#
# --chroot <PATH_TO_CHROOT>
# check the 'parabola-keyring' of a chroot system
# the chroot system must be already mounted, or otherwise accessible
#
readonly HACKER_KEYS_SCRIPT=/usr/lib/parabola-hackers/pgp-list-keyids
readonly KEYSERVER=hkp://hkps.pool.sks-keyservers.net:11371/
readonly WARNING_N_DAYS=30
readonly AUTOBUILDER_KEY='D3EAD7F9D076EB9AF650149DA170D6A0B669E21A'
readonly SHOULD_SHOW_ALL=$( [[ "$1" == '--all' ]] && echo 1 || echo 0 ) ; (( $# > 1 )) && shift ;
readonly CHROOT=$( [[ "$1" == '--chroot' ]] && echo $2 )
readonly JOIN_CHAR='='
readonly INFINITE_EXPIRY='EXPIRY_INFINITE'
readonly HACKER_KEY_REGEX="([^${JOIN_CHAR}]+)${JOIN_CHAR}([^${JOIN_CHAR}]+)"
readonly KEYDATA_EXPIRY_1_REGEX="([^=]+)${JOIN_CHAR}([0-9A-F]{40})${JOIN_CHAR}([0-9]{4}-[0-9]{2}-[0-9]{2})"
readonly KEYDATA_EXPIRY_2_REGEX="([^=]+)${JOIN_CHAR}([0-9A-F]{40})${JOIN_CHAR}(${INFINITE_EXPIRY})"
readonly EXPIRY_REGEX='^.* \[expire[ds]: ([0-9]{4}-[0-9]{2}-[0-9]{2})\]$'
readonly TRUSTED_REGEX='^uid \[ full \]'
readonly GPG_CMD="gpg --keyserver ${KEYSERVER}"
readonly GPG_LIST_OPTIONS='--list-options show-unusable-subkeys --with-subkey-fingerprint'
readonly PACMAN_LIST_OPTIONS="--homedir /etc/pacman.d/gnupg ${GPG_LIST_OPTIONS}"
readonly NOW=$(date +%s)
readonly WARNING_DURATION=$(( 86400 * WARNING_N_DAYS ))
readonly CHROOT_ERR_MSG="ERROR: specified chroot does not exist: '${CHROOT}'"
readonly HACKER_KEY_ERR_MSG="ERROR: no key data - check ${HACKER_KEYS_SCRIPT}"
readonly HACKER_KEYS=( $(${HACKER_KEYS_SCRIPT} | grep -v ${AUTOBUILDER_KEY} | tr ' ' ${JOIN_CHAR}) ) # testing examples below:
# readonly HACKER_KEYS=("trusted/aurelien${JOIN_CHAR}560B3DEC2F13E822ACED475B2EC52AC76AEEB6A0") # EXPIRY_INFINITE,no-subkey
# readonly HACKER_KEYS=("trusted/bill-auger${JOIN_CHAR}FBCC5AD7421197B7ABA72853908710913E8C7778") # rolling expiry,subkey
# readonly HACKER_KEYS=("trusted/oaken-source${JOIN_CHAR}BFA8008A8265677063B11BF47171986E4B745536") # rolling expiry,no-signing-subkey
# readonly HACKER_KEYS=("trusted/freemor${JOIN_CHAR}17446CB76E250EE809DFE1F2A7DC2FC7EBC8F713")
declare -A OutdatedKeys
declare -A WarningKeys
declare -A RevokedKeys
declare -A ExpiredKeys
declare -A UntrustedKeys
declare -A ValidKeys
## logging ##
readonly DEBUG=0
DBG() { (( DEBUG )) && LOG "$@" ; }
LOG() { echo -e "$@" >&2 ; }
## helpers ##
ParseExpiry() # (key_data)
{
local key_data="$1"
local expiry=$(grep -E "${EXPIRY_REGEX}" <<<${key_data} | sed -E "s|${EXPIRY_REGEX}|\1|")
[[ -n "${expiry}" ]] && echo ${expiry} || echo ${INFINITE_EXPIRY}
}
ParseKeyData() # (login key_id key_data)
{
local login=$1
local key_id=$2
local key_data="$3"
local master_key_data="$(grep --max-count=1 -A 1 -E '^pub ' <<<${key_data})"
local subkey_data="$( grep --max-count=1 -A 1 -E '^sub ' <<<${key_data})"
local master_key_id=$(tail -n 1 <<<${master_key_data} | tr -d ' ')
local subkey_id=$( tail -n 1 <<<${subkey_data} | tr -d ' ')
local master_expiry=$(ParseExpiry "${master_key_data}")
local subkey_expiry=$(ParseExpiry "${subkey_data}" )
DBG "\nParseKeyData() key_id='${key_id}'"
# DBG "ParseKeyData() key_data='${key_data}'"
# DBG "ParseKeyData() master_key_data='${master_key_data}'"
# DBG "ParseKeyData() subkey_data='${subkey_data}'"
DBG "ParseKeyData() master_key_id='${master_key_id}'"
DBG "ParseKeyData() subkey_id='${subkey_id}'"
DBG "ParseKeyData() master_expiry='${master_expiry}'"
DBG "ParseKeyData() subkey_expiry='${subkey_expiry}'"
if [[ -z "${subkey_data}" ]]
then echo "${login}${JOIN_CHAR}${master_key_id}${JOIN_CHAR}${master_expiry}"
else echo "${login}${JOIN_CHAR}${master_key_id}${JOIN_CHAR}${master_expiry} ${login}${JOIN_CHAR}${subkey_id}${JOIN_CHAR}${subkey_expiry}"
fi
}
LoadKeyData() # (login key_id "list_options")
{
local login=$1
local key_id=$2
local list_options="$3"
[[ "${list_options}" == "${GPG_LIST_OPTIONS}" ]] && ${GPG_CMD} --recv-keys ${key_id} &> /dev/null
ParseKeyData ${login} ${key_id} "$(${GPG_CMD} ${list_options} --list-keys ${key_id} 2> /dev/null)"
}
RawKeysData() # (key_id)
{
local key_id=$1
pacman-key --list-keys ${key_id} 2> /dev/null
}
ShouldWarn() # (expiry)
{
local expiry=$1
local expiry_ts=$(date --date ${expiry} +%s 2> /dev/null)
local expiry_duration=$(( expiry_ts - NOW ))
[[ ${expiry_duration} -gt 0 && ${expiry_duration} -lt ${WARNING_DURATION} ]]
}
IsExpired() # (key_data)
{
local key_data="$1"
grep -E '(expired)' <<<${key_data} > /dev/null
}
IsRevoked() # (key_data)
{
local key_data="$1"
grep -E '(revoked)' <<<${key_data} > /dev/null
}
IsUntrusted() # (key_data)
{
local key_data="$1"
! grep -E "${TRUSTED_REGEX}" <<<${key_data} > /dev/null
}
IsValid() # (key_data)
{
local key_data="$1"
grep -Ev '(expired)|(revoked)' <<<${key_data} > /dev/null
}
## business ##
ProcessHackerKey() # (hacker_data)
{
! [[ "$1" =~ ^${HACKER_KEY_REGEX}$ ]] && LOG "${HACKER_KEY_ERR_MSG}" && return 1
local login=${BASH_REMATCH[1]}
local key_id=${BASH_REMATCH[2]}
DBG "\nProcessHackerKey() login=${login} key_id=${key_id}"
# fetch, parse, and cache key data
local gpg_keys_data="$( LoadKeyData ${login} ${key_id} "${GPG_LIST_OPTIONS}" )"
local pacman_keys_data="$(LoadKeyData ${login} ${key_id} "${PACMAN_LIST_OPTIONS}")"
local raw_keys_data="$( RawKeysData ${key_id} )"
# process key data
if [[ "${gpg_keys_data}" == "${pacman_keys_data}" ]]
then # process both master and subkey, if subkey in hackers.git
# TODO: how to know if subkey in hackers.git
local keys_data="${pacman_keys_data}"
local key_data
local expiry
for key_data in ${keys_data}
do # load key data
if [[ "${key_data}" =~ ^${KEYDATA_EXPIRY_1_REGEX}$ ]] ||
[[ "${key_data}" =~ ^${KEYDATA_EXPIRY_2_REGEX}$ ]]
then login=${BASH_REMATCH[ 1]}
key_id=${BASH_REMATCH[2]}
expiry=${BASH_REMATCH[3]}
else login=''
key_id=''
expiry=''
LOG "ERROR: parsing key: ${key_id}"
fi
[[ -n "${expiry}" ]] && DBG "ProcessHackerKey() keys_data=${keys_data}\nProcessHackerKey() key_id=${key_id}\nProcessHackerKey() expiry=${expiry}" || DBG "ProcessHackerKey() key_data=${key_data}"
[[ -n "${expiry}" ]] || continue
# process key data (mutually exclusive states)
ShouldWarn ${expiry} && WarningKeys[${login}]="${key_id} ${expiry}" && continue
IsRevoked "${keys_data}" && RevokedKeys[${login}]="${key_id} ${expiry}" && continue
IsExpired "${keys_data}" && ExpiredKeys[${login}]="${key_id} ${expiry}" && continue
IsUntrusted "${raw_keys_data}" && UntrustedKeys[${login}]="${key_id} ${expiry}" && continue
IsValid "${keys_data}" && ValidKeys[${login}]="${key_id} ${expiry}"
done
else OutdatedKeys[${login}]="${gpg_keys_data}\n${pacman_keys_data}"
DBG "ProcessHackerKey() OutdatedKeys gpg_keys_data =${gpg_keys_data}\nProcessHackerKey() OutdatedKeys pacman_keys_data=${pacman_keys_data}"
fi
}
main()
{
# collect results
echo -n "(${#HACKER_KEYS[@]}) keys to consider "
for hacker_key in ${HACKER_KEYS[@]}
do echo -n '.' && ProcessHackerKey ${hacker_key} || :
done ; echo ;
# display results
if (( ${#ValidKeys[@]} * SHOULD_SHOW_ALL ))
then echo -e "\n\n== ValidKeys ==\n"
for login in "${!ValidKeys[@]}" ; do echo "${login} ${ValidKeys[${login}]}" ; done ;
fi
if (( ${#OutdatedKeys[@]} ))
then echo -e "\n\n== OutdatedKeys ==\n"
for login in "${!OutdatedKeys[@]}" ; do echo -e "${OutdatedKeys[${login}]}" ; done ;
fi
if (( ${#WarningKeys[@]} ))
then echo -e "\n\n== WarningKeys ==\n"
for login in "${!WarningKeys[@]}" ; do echo "${login} ${WarningKeys[${login}]}" ; done ;
fi
if (( ${#RevokedKeys[@]} ))
then echo -e "\n\n== RevokedKeys ==\n"
for login in "${!RevokedKeys[@]}" ; do echo "${login} ${RevokedKeys[${login}]}" ; done ;
fi
if (( ${#ExpiredKeys[@]} ))
then echo -e "\n\n== ExpiredKeys ==\n"
for login in "${!ExpiredKeys[@]}" ; do echo "${login} ${ExpiredKeys[${login}]}" ; done ;
fi
if (( ${#UntrustedKeys[@]} ))
then echo -e "\n\n== UntrustedKeys ==\n"
for login in "${!UntrustedKeys[@]}" ; do echo "${login} ${UntrustedKeys[${login}]}" ; done ;
fi
}
## main entry ##
set -e
# re-run in chroot
if [[ -z "${CHROOT}" ]]
then main
elif [[ -d "${CHROOT}" ]]
then sudo cp ${BASH_SOURCE} ${CHROOT}/
sudo chroot ${CHROOT}/ ./$(basename ${BASH_SOURCE})
else LOG "${CHROOT_ERR_MSG}"
fi
|
