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# Copyright 2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: verify-sig.eclass
# @MAINTAINER:
# Michał Górny <mgorny@gentoo.org>
# @SUPPORTED_EAPIS: 7
# @BLURB: Eclass to verify upstream signatures on distfiles
# @DESCRIPTION:
# verify-sig eclass provides a streamlined approach to verifying
# upstream signatures on distfiles. Its primary purpose is to permit
# developers to easily verify signatures while bumping packages.
# The eclass removes the risk of developer forgetting to perform
# the verification, or performing it incorrectly, e.g. due to additional
# keys in the local keyring. It also permits users to verify
# the developer's work.
#
# To use the eclass, start by packaging the upstream's key
# as app-crypt/openpgp-keys-*. Then inherit the eclass, add detached
# signatures to SRC_URI and set VERIFY_SIG_OPENPGP_KEY_PATH. The eclass
# provides verify-sig USE flag to toggle the verification.
#
# Example use:
# @CODE
# inherit verify-sig
#
# SRC_URI="https://example.org/${P}.tar.gz
# verify-sig? ( https://example.org/${P}.tar.gz.sig )"
# BDEPEND="
# verify-sig? ( app-crypt/openpgp-keys-example )"
#
# VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/example.asc
# @CODE
case "${EAPI:-0}" in
0|1|2|3|4|5|6)
die "Unsupported EAPI=${EAPI} (obsolete) for ${ECLASS}"
;;
7)
;;
*)
die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
;;
esac
EXPORT_FUNCTIONS src_unpack
if [[ ! ${_VERIFY_SIG_ECLASS} ]]; then
IUSE="verify-sig"
BDEPEND="
verify-sig? (
app-crypt/gnupg
>=app-portage/gemato-16
)"
# @ECLASS-VARIABLE: VERIFY_SIG_OPENPGP_KEY_PATH
# @DEFAULT_UNSET
# @DESCRIPTION:
# Path to key bundle used to perform the verification. This is required
# when using default src_unpack. Alternatively, the key path can be
# passed directly to the verification functions.
# @ECLASS-VARIABLE: VERIFY_SIG_OPENPGP_KEYSERVER
# @DEFAULT_UNSET
# @DESCRIPTION:
# Keyserver used to refresh keys. If not specified, the keyserver
# preference from the key will be respected. If no preference
# is specified by the key, the GnuPG default will be used.
# @ECLASS-VARIABLE: VERIFY_SIG_OPENPGP_KEY_REFRESH
# @USER_VARIABLE
# @DESCRIPTION:
# Attempt to refresh keys via WKD/keyserver. Set it to "yes"
# in make.conf to enable. Note that this requires working Internet
# connection.
: ${VERIFY_SIG_OPENPGP_KEY_REFRESH:=no}
# @FUNCTION: verify-sig_verify_detached
# @USAGE: <file> <sig-file> [<key-file>]
# @DESCRIPTION:
# Read the detached signature from <sig-file> and verify <file> against
# it. <key-file> can either be passed directly, or it defaults
# to VERIFY_SIG_OPENPGP_KEY_PATH. The function dies if verification
# fails.
verify-sig_verify_detached() {
local file=${1}
local sig=${2}
local key=${3:-${VERIFY_SIG_OPENPGP_KEY_PATH}}
[[ -n ${key} ]] ||
die "${FUNCNAME}: no key passed and VERIFY_SIG_OPENPGP_KEY_PATH unset"
local extra_args=()
[[ ${VERIFY_SIG_OPENPGP_KEY_REFRESH} == yes ]] || extra_args+=( -R )
[[ -n ${VERIFY_SIG_OPENPGP_KEYSERVER+1} ]] && extra_args+=(
--keyserver "${VERIFY_SIG_OPENPGP_KEYSERVER}"
)
einfo "Verifying ${file##*/} ..."
gemato gpg-wrap -K "${key}" "${extra_args[@]}" -- \
gpg --verify "${sig}" "${file}" ||
die "PGP signature verification failed"
}
# @FUNCTION: verify-sig_src_unpack
# @DESCRIPTION:
# Default src_unpack override that verifies signatures for all
# distfiles if 'verify-sig' flag is enabled. The function dies if any
# of the signatures fails to verify or if any distfiles are not signed.
# Please write src_unpack() yourself if you need to perform partial
# verification.
verify-sig_src_unpack() {
if use verify-sig; then
local f suffix found
local distfiles=() signatures=() nosigfound=() straysigs=()
# find all distfiles and signatures, and combine them
for f in ${A}; do
found=
for suffix in .asc .sig; do
if [[ ${f} == *${suffix} ]]; then
signatures+=( "${f}" )
found=sig
break
else
if has "${f}${suffix}" ${A}; then
distfiles+=( "${f}" )
found=dist+sig
break
fi
fi
done
if [[ ! ${found} ]]; then
nosigfound+=( "${f}" )
fi
done
# check if all distfiles are signed
if [[ ${#nosigfound[@]} -gt 0 ]]; then
eerror "The following distfiles lack detached signatures:"
for f in "${nosigfound[@]}"; do
eerror " ${f}"
done
die "Unsigned distfiles found"
fi
# check if there are no stray signatures
for f in "${signatures[@]}"; do
if ! has "${f%.*}" "${distfiles[@]}"; then
straysigs+=( "${f}" )
fi
done
if [[ ${#straysigs[@]} -gt 0 ]]; then
eerror "The following signatures do not match any distfiles:"
for f in "${straysigs[@]}"; do
eerror " ${f}"
done
die "Unused signatures found"
fi
# now perform the verification
for f in "${signatures[@]}"; do
verify-sig_verify_detached \
"${DISTDIR}/${f%.*}" "${DISTDIR}/${f}"
done
fi
# finally, unpack the distfiles
default_src_unpack
}
_VERIFY_SIG_ECLASS=1
fi
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