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|
#!/bin/bash
# gentoo-infra: infra/githooks.git:update-02-gpg
# --- Command line
refname=${1}
oldrev=${2}
newrev=${3}
# --- Safety check
if [ -z "${GIT_DIR}" ]; then
echo "Don't run this script from the command line." >&2
echo " (if you want, you could supply GIT_DIR then run" >&2
echo " ${0} <ref> <oldrev> <newrev>)" >&2
exit 1
fi
if [ -z "${refname}" ] || [ -z "${oldrev}" ] || [ -z "${newrev}" ]; then
echo "usage: ${0} <ref> <oldrev> <newrev>" >&2
exit 1
fi
# branch names or 'all', or 'all-refs' for all refs
SIGNED_BRANCHES=$(git config --get gentoo.signed-branches)
: "${SIGNED_BRANCHES:=master}"
VERIFY_SIGS=$(git config --get gentoo.verify-signatures)
: "${VERIFY_SIGS:=gentoo-devs}"
: "${GL_USER:=}" # Should come from the gitolite
: "${gpg_fpr:=}" # Should come from the gitolite hook
case ${VERIFY_SIGS} in
gentoo-devs)
if [[ ${GL_USER} != *@gentoo.org ]]; then
echo "*** Pusher address is not @gentoo.org" >&2
echo " (it is ${GL_USER})" >&2
echo "*** Please report this to infra ($0)" >&2
exit 1
fi
# find key fingerprints in LDAP
KEY_FPS=$(ldapsearch "uid=${GL_USER%@gentoo.org}" -D '' -Z -LLL \
gpgfingerprint -o ldif-wrap=no | \
sed -n -e '/^gpgfingerprint: /{s/^.*://;s/ //g;p}')
# verify GLEP63 compliance
GOOD_KEYS=()
HAVE_NONCOMPLIANT=no
for K in ${KEY_FPS}; do
LC_CTYPE=en_US.UTF-8 \
glep63-check -S glep63-2 -k "${K}" &&
GOOD_KEYS+=( "${K}" ) ||
HAVE_NONCOMPLIANT=yes
done
if [[ ${#GOOD_KEYS[@]} -eq 0 ]]; then
echo "*** None of your keys comply with GLEP 63." >&2
echo " Please update the keys into conformance if you wish to continue" >&2
echo " using them. If not, please remove unused keys from LDAP." >&2
exit 1
elif [[ ${HAVE_NONCOMPLIANT} == yes ]]; then
echo "*** Warning. One or more OpenPGP keys do not comply with GLEP 63." >&2
echo " Please update the keys into conformance if you wish to continue" >&2
echo " using them. If not, please remove unused keys from LDAP." >&2
fi
# create a dedicated GNUPGHOME
TMPHOME=$(mktemp -d)
trap 'rm -rf "${TMPHOME}"' EXIT
# transfer the keys:
# - ONLY for the developer/service in question
# - with chain to L1
CHAIN_L1=(
ABD00913019D6354BA1D9A132839FE0D796198B1 # openpgp-auth+l1@gentoo.org
)
CHAIN_L2=(
2C13823B8237310FA213034930D132FF0FF50EEB # openpgp-auth+l2-dev@gentoo.org
18F703D702B1B9591373148C55D3238EC050396E # openpgp-auth+l2-srv@gentoo.org
)
EXPORT_CMD=(
gpg -q
--export-options 'export-clean,no-export-local-sigs,no-export-attributes'
# keep-uid filter is not working in gnupg-2.4.3 or gnupg-2.2.41
#--export-filter 'keep-uid="uid =~ @gentoo.org"'
--export
)
IMPORT_CMD=(
gpg -q
# no-self-sigs-only is needed to import the signature chain.
--import-options 'import-clean,no-import-local-sigs,no-keep-ownertrust,no-self-sigs-only'
# keep-uid filter is not working in gnupg-2.4.3 or gnupg-2.2.41
#--import-filter 'keep-uid="uid =~ @gentoo.org"'
--import
)
"${EXPORT_CMD[@]}" \
"${CHAIN_L1[@]}" \
"${CHAIN_L2[@]}" \
"${GOOD_KEYS[@]}" \
| \
GNUPGHOME=${TMPHOME} \
"${IMPORT_CMD[@]}"
# use new GNUGPHOME to restrict to dev's keys
GNUPGHOME=${TMPHOME}
export GNUPGHOME=${TMPHOME}
cat >>"$GNUPGHOME"/gpg.conf <<-EOF
# Explicitly set trust model;
# git-2.43 does not recognize the always & direct trust model behavior
# so it exports that the signatures came from an untrusted key
trust-model pgp
EOF
# And declare that the L1 key is trusted.
# This could go into the trustdb file instead, but cleaner this way.
for _k in "${CHAIN_L1[@]}" ; do
echo "trusted-key $_k" >>"$GNUPGHOME"/gpg.conf
done
# If there are problems w/ the key export/import loop, or trust
# verification; dump here
#GNUPGHOME=${TMPHOME} gpg --check-trustdb
#GNUPGHOME=${TMPHOME} gpg --list-sig
;;
keys.gentoo.org)
GNUPGHOME=$(readlink -f ~git/.gnupg-sks/)
export GNUPGHOME
# Valid keys for this user
KEY_FPS=${gpg_fpr}
if [[ -z "$KEY_FPS" ]]; then
fail_signed_push "No keys configured in Gitolite for $GL_USER"
fi
# create a dedicated GNUPGHOME
TMPHOME=$(mktemp -d)
trap 'rm -rf "${TMPHOME}"' EXIT
EXPORT_CMD=(
gpg -q
--export-options 'export-clean,no-export-local-sigs,no-export-attributes'
# keep-uid filter is not working in gnupg-2.4.3 or gnupg-2.2.41
#--export-filter 'keep-uid="uid =~ @gentoo.org"'
--export
)
IMPORT_CMD=(
gpg -q
# no-self-sigs-only is needed to import the signature chain.
--import-options 'import-clean,no-import-local-sigs,no-keep-ownertrust,no-self-sigs-only'
# keep-uid filter is not working in gnupg-2.4.3 or gnupg-2.2.41
#--import-filter 'keep-uid="uid =~ @gentoo.org"'
--import
)
mapfile -t GOOD_KEYS < <(fmt -1 <<<"${gpg_fpr//,/ }")
"${EXPORT_CMD[@]}" \
"${GOOD_KEYS[@]}" \
| \
GNUPGHOME=${TMPHOME} \
"${IMPORT_CMD[@]}"
# use new GNUGPHOME to restrict to dev's keys
GNUPGHOME=${TMPHOME}
export GNUPGHOME
cat >>"$GNUPGHOME"/gpg.conf <<-EOF
# Explicitly set trust model;
# git-2.43 does not recognize the always & direct trust model behavior
# so it exports that the signatures came from an untrusted key
trust-model pgp
EOF
# And declare that the declared Git keys are trusted
# This could go into the trustdb file instead, but cleaner this way.
for _k in "${GOOD_KEYS[@]}" ; do
echo "trusted-key $_k" >> "$GNUPGHOME"/gpg.conf
done
;;
no)
;;
*)
echo "Invalid value of gentoo.verify-signatures" >&2
exit 1
esac
case ${SIGNED_BRANCHES} in
all-refs)
;;
all)
[[ ${refname} == refs/heads/* ]] || exit 0
;;
*)
[[ ${refname} == refs/heads/* ]] || exit 0
branch_found=
for branch in ${SIGNED_BRANCHES}; do
if [[ ${refname#refs/heads/} == "${branch}" ]]; then
branch_found=1
break
fi
done
[[ ${branch_found} == 1 ]] || exit 0
esac
IFS='
'
# special cases
zeros=0000000000000000000000000000000000000000
# branch removal
[[ ${newrev} == "${zeros}" ]] && exit 0
# new branch; try to find a merge base with master
if [[ ${oldrev} == "${zeros}" && ${refname} != refs/heads/master ]]; then
mergebase=$(git merge-base refs/heads/master "${newrev}")
[[ -n ${mergebase} ]] && oldrev=${mergebase}
fi
rev_list_arg="${oldrev}..${newrev}"
# new and no common commit? gotta check them all
[[ ${oldrev} == "${zeros}" ]] && rev_list_arg="${newrev}"
while read -r r; do
committer=$(git show -q --pretty=format:'%ce' "${r}")
if [[ ${VERIFY_SIGS} == gentoo-devs && ${committer} != *@gentoo.org ]]; then
echo "*** Committer address is not @gentoo.org, refusing"
exit 1
fi
signst=$(git show -q --pretty=format:'%G?' "${r}")
case ${VERIFY_SIGS} in
gentoo-devs|keys.gentoo.org)
# gentoo dev signatures must be Good
[[ ${signst} == G ]] && continue
;;
no)
# additionally skip untrusted/impossible to check
# when verification is disabled
[[ ${signst} == [GUE] ]] && continue
;;
esac
# error reporting
case ${signst} in
U)
echo "*** Untrusted signature on ${r}, refusing"
exit 1
;;
B)
echo "*** Bad signature on ${r}, refusing"
exit 1
;;
N)
echo "*** No signature on ${r}, refusing"
exit 1
;;
E)
echo "*** Signature cannot be checked on ${r}, refusing"
exit 1
;;
*)
echo "*** Unknown signature status '${signst}', refusing"
exit 1
;;
esac
done < <(git rev-list --first-parent "${rev_list_arg}")
# --- Finished
exit 0
|
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