summaryrefslogtreecommitdiff
blob: f4414480caf2abadf2bac7cae835a5cd46afb9ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
# Copyright 1999-2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

PYTHON_COMPAT=( python3_{10..13} )
inherit edo python-any-r1

DESCRIPTION="Gentoo Authority Keys (GLEP 79)"
HOMEPAGE="https://www.gentoo.org/downloads/signatures/"
if [[ ${PV} == 9999* ]] ; then
	PROPERTIES="live"

	BDEPEND="net-misc/curl"
else
	SRC_URI="https://qa-reports.gentoo.org/output/keys/active-devs-${PV}.gpg -> ${P}-active-devs.gpg"
	KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv sparc x86"
fi

S="${WORKDIR}"

LICENSE="public-domain"
SLOT="0"
IUSE="test"
RESTRICT="!test? ( test )"

BDEPEND+="
	$(python_gen_any_dep 'dev-python/python-gnupg[${PYTHON_USEDEP}]')
	>=sec-keys/openpgp-keys-gentoo-auth-20240703
	test? (
		app-crypt/gnupg
		sys-apps/grep[pcre]
	)
"

python_check_deps() {
	python_has_version "dev-python/python-gnupg[${PYTHON_USEDEP}]"
}

src_unpack() {
	if [[ ${PV} == 9999* ]] ; then
		curl https://qa-reports.gentoo.org/output/active-devs.gpg -o ${P}-active-devs.gpg || die
	else
		default
	fi
}

src_compile() {
	export GNUPGHOME="${T}"/.gnupg

	get_gpg_keyring_dir() {
		if [[ ${PV} == 9999* ]] ; then
			echo "${WORKDIR}"
		else
			echo "${DISTDIR}"
		fi
	}

	local mygpgargs=(
		--no-autostart
		--no-default-keyring
		--homedir "${GNUPGHOME}"
	)

	# From verify-sig.eclass:
	# "GPG upstream knows better than to follow the spec, so we can't
	# override this directory.  However, there is a clean fallback
	# to GNUPGHOME."
	addpredict /run/user

	mkdir "${GNUPGHOME}" || die
	chmod 700 "${GNUPGHOME}" || die

	# Convert the binary keyring into an armored one so we can process it
	edo gpg "${mygpgargs[@]}" --import "$(get_gpg_keyring_dir)"/${P}-active-devs.gpg
	edo gpg "${mygpgargs[@]}" --export --armor > "${WORKDIR}"/gentoo-developers.asc

	# Now strip out the keys which are expired and/or missing a signature
	# from our L2 developer authority key
	edo "${EPYTHON}" "${FILESDIR}"/keyring-mangler.py \
			"${BROOT}"/usr/share/openpgp-keys/gentoo-auth.asc \
			"${WORKDIR}"/gentoo-developers.asc \
			"${WORKDIR}"/gentoo-developers-sanitised.asc
}

src_test() {
	export GNUPGHOME="${T}"/tests/.gnupg

	local mygpgargs=(
		# We don't have --no-autostart here because we need
		# to let it spawn an agent for the key generation.
		--no-default-keyring
		--homedir "${GNUPGHOME}"
	)

	# From verify-sig.eclass:
	# "GPG upstream knows better than to follow the spec, so we can't
	# override this directory.  However, there is a clean fallback
	# to GNUPGHOME."
	addpredict /run/user

	# Check each of the keys to verify they're trusted by
	# the L2 developer key.
	mkdir -p "${GNUPGHOME}" || die
	chmod 700 "${GNUPGHOME}" || die
	cd "${T}"/tests || die

	# First, grab the L1 key, and mark it as ultimately trusted.
	edo gpg "${mygpgargs[@]}" --import "${BROOT}"/usr/share/openpgp-keys/gentoo-auth.asc
	edo gpg "${mygpgargs[@]}" --import-ownertrust "${BROOT}"/usr/share/openpgp-keys/gentoo-auth-ownertrust.txt

	# Generate a temporary key which isn't signed by anything to check
	# whether we're detecting unexpected keys.
	#
	# The test is whether this appears in the sanitised keyring we
	# produce in src_compile (it should not be in there).
	#
	# https://www.gnupg.org/documentation/manuals/gnupg/Unattended-GPG-key-generation.html
	edo gpg "${mygpgargs[@]}" --batch --gen-key <<-EOF
		%echo Generating temporary key for testing...

		%no-protection
		%transient-key
		%pubring ${P}-ebuild-test-key.asc

		Key-Type: 1
		Key-Length: 2048
		Subkey-Type: 1
		Subkey-Length: 2048
		Name-Real: Larry The Cow
		Name-Email: larry@example.com
		Expire-Date: 0
		Handle: ${P}-ebuild-test-key

		%commit
		%echo Temporary key generated!
	EOF

	# Import the new injected key that shouldn't be signed by anything into a temporary testing keyring
	edo gpg "${mygpgargs[@]}" --import "${T}"/tests/${P}-ebuild-test-key.asc

	# Sign a tiny file with the to-be-injected key for testing rejection below
	echo "Hello world!" > "${T}"/tests/signme || die
	edo gpg "${mygpgargs[@]}" -u "Larry The Cow <larry@example.com>" --sign "${T}"/tests/signme || die

	# keyring-mangler will fail with no valid keys so import the sanitised list from src_compile.
	edo gpg "${mygpgargs[@]}" --import "${WORKDIR}"/gentoo-developers-sanitised.asc

	edo gpg "${mygpgargs[@]}" --export --armor > "${T}"/tests/tainted-keyring.asc

	# keyring-mangler.py should now produce a keyring *without* it
	edo "${EPYTHON}" "${FILESDIR}"/keyring-mangler.py \
			"${BROOT}"/usr/share/openpgp-keys/gentoo-auth.asc \
			"${T}"/tests/tainted-keyring.asc \
			"${T}"/tests/gentoo-developers-sanitised.asc | tee "${T}"/tests/keyring-mangler.log
	assert "Key mangling in tests failed?"

	# Check the log to verify the injected key got detected
	grep -q "Dropping key.*Larry The Cow" "${T}"/tests/keyring-mangler.log || die "Did not remove injected key from test keyring!"

	# gnupg doesn't have an easy way for us to actually just.. ask
	# if a key is known via WoT. So, sign a file using the key
	# we just made, and then try to gpg --verify it, and check exit code.
	#
	# Let's now double check by seeing if a file signed by the injected key
	# is rejected.
	if gpg "${mygpgargs[@]}" --keyring "${T}"/tests/gentoo-developers-sanitised.asc --verify "${T}"/tests/signme.gpg ; then
		die "'gpg --verify' using injected test key succeeded! This shouldn't happen!"
	fi

	# Bonus lame sanity check
	edo gpg "${mygpgargs[@]}" --check-trustdb 2>&1 | tee "${T}"/tests/trustdb.log
	assert "trustdb call failed!"

	check_trust_levels() {
		local mode=${1}

		while IFS= read -r line; do
			# gpg: depth: 0  valid:   1  signed:   2  trust: 0-, 0q, 0n, 0m, 0f, 1u
			# gpg: depth: 1  valid:   2  signed:   0  trust: 0-, 0q, 0n, 0m, 2f, 0u
			if [[ ${line} == *depth* ]] ; then
				depth=$(echo ${line} | grep -Po "depth: [0-9]")
				trust=$(echo ${line} | grep -Po "trust:.*")

				trust_uncalculated=$(echo ${trust} | grep -Po "[0-9]-")
				[[ ${trust_uncalculated} == 0 ]] || ${mode}

				trust_insufficient=$(echo ${trust} | grep -Po "[0-9]q")
				[[ ${trust_insufficient} == 0 ]] || ${mode}

				trust_never=$(echo ${trust} | grep -Po "[0-9]n")
				[[ ${trust_never} == 0 ]] || ${mode}

				trust_marginal=$(echo ${trust} | grep -Po "[0-9]m")
				[[ ${trust_marginal} == 0 ]] || ${mode}

				trust_full=$(echo ${trust} | grep -Po "[0-9]f")
				[[ ${trust_full} != 0 ]] || ${mode}

				trust_ultimate=$(echo ${trust} | grep -Po "[0-9]u")
				[[ ${trust_ultimate} == 1 ]] || ${mode}

				echo "${trust_uncalculated}, ${trust_insufficient}"
			fi
		done < "${T}"/tests/trustdb.log
	}

	# First, check with the bad key still in the test keyring.
	# This is supposed to fail, so we want it to return 1
	check_trust_levels "return 1" && die "Trustdb passed when it should have failed!"

	# Now check without the bad key in the test keyring.
	# This one should pass.
	#
	# Drop the bad key first (https://superuser.com/questions/174583/how-to-delete-gpg-secret-keys-by-force-without-fingerprint)
	keys=$(gpg "${mygpgargs[@]}" --fingerprint --with-colons --batch "Larry The Cow <larry@example.com>" \
		| grep "^fpr" \
		| sed -n 's/^fpr:::::::::\([[:alnum:]]\+\):/\1/p')

	local key
	for key in ${keys[@]} ; do
		nonfatal edo gpg "${mygpgargs[@]}" --batch --yes --delete-secret-keys ${key}
	done

	edo gpg "${mygpgargs[@]}" --batch --yes --delete-keys "Larry The Cow <larry@example.com>"
	check_trust_levels "return 0" || die "Trustdb failed when it should have passed!"

	gpgconf --kill gpg-agent || die
}

src_install() {
	insinto /usr/share/openpgp-keys
	newins gentoo-developers-sanitised.asc gentoo-developers.asc

	# TODO: install an ownertrust file like sec-keys/openpgp-keys-gentoo-auth?
}