summaryrefslogtreecommitdiff
path: root/scripts/libmakepkg/integrity/verify_signature.sh.in
blob: 4037f562fe3558a7fbeeb5f81c790a3ab71c821e (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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
#!/bin/bash
#
#   verify_signature.sh - functions for checking PGP signatures
#
#   Copyright (c) 2011-2018 Pacman Development Team <pacman-dev@archlinux.org>
#
#   This program 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 2 of the License, or
#   (at your option) any later version.
#
#   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
#

[[ -n "$LIBMAKEPKG_INTEGRITY_VERIFY_SIGNATURE_SH" ]] && return
LIBMAKEPKG_INTEGRITY_VERIFY_SIGNATURE_SH=1

LIBRARY=${LIBRARY:-'@libmakepkgdir@'}

source "$LIBRARY/util/message.sh"
source "$LIBRARY/util/pkgbuild.sh"

check_pgpsigs() {
	(( SKIPPGPCHECK )) && return 0
	! source_has_signatures && return 0

	msg "$(gettext "Verifying source file signatures with %s...")" "gpg"

	local netfile proto pubkey success status fingerprint trusted
	local warnings=0
	local errors=0
	local statusfile=$(mktemp)
	local all_sources

	case $1 in
		all)
			get_all_sources 'all_sources'
			;;
		*)
			get_all_sources_for_arch 'all_sources'
			;;
	esac
	for netfile in "${all_sources[@]}"; do
		proto="$(get_protocol "$netfile")"

		if declare -f verify_${proto}_signature > /dev/null; then
			verify_${proto}_signature "$netfile" "$statusfile" || continue
		else
			verify_file_signature "$netfile" "$statusfile" || continue
		fi

		# these variables are assigned values in parse_gpg_statusfile
		success=0
		status=
		pubkey=
		fingerprint=
		trusted=
		parse_gpg_statusfile "$statusfile"
		if (( ! $success )); then
			printf '%s' "$(gettext "FAILED")" >&2
			case "$status" in
				"missingkey")
					printf ' (%s)' "$(gettext "unknown public key") $pubkey" >&2
					;;
				"revokedkey")
					printf " ($(gettext "public key %s has been revoked"))" "$pubkey" >&2
					;;
				"bad")
					printf ' (%s)' "$(gettext "bad signature from public key") $pubkey" >&2
					;;
				"error")
					printf ' (%s)' "$(gettext "error during signature verification")" >&2
					;;
			esac
			errors=1
		else
			if (( ${#validpgpkeys[@]} == 0 && !trusted )); then
				printf "%s ($(gettext "the public key %s is not trusted"))" $(gettext "FAILED") "$fingerprint" >&2
				errors=1
			elif (( ${#validpgpkeys[@]} > 0 )) && ! in_array "$fingerprint" "${validpgpkeys[@]}"; then
				printf "%s (%s %s)" "$(gettext "FAILED")" "$(gettext "invalid public key")" "$fingerprint" >&2
				errors=1
			else
				printf '%s' "$(gettext "Passed")" >&2
				case "$status" in
					"expired")
						printf ' (%s)' "$(gettext "WARNING:") $(gettext "the signature has expired.")" >&2
						warnings=1
						;;
					"expiredkey")
						printf ' (%s)' "$(gettext "WARNING:") $(gettext "the key has expired.")" >&2
						warnings=1
						;;
				esac
			fi
		fi
		printf '\n' >&2
	done

	rm -f "$statusfile"

	if (( errors )); then
		error "$(gettext "One or more PGP signatures could not be verified!")"
		exit 1
	fi

	if (( warnings )); then
		warning "$(gettext "Warnings have occurred while verifying the signatures.")"
		plain "$(gettext "Please make sure you really trust them.")"
	fi
}

verify_file_signature() {
	local netfile="$1" statusfile="$2"
	local file ext decompress found sourcefile

	file="$(get_filename "$netfile")"
	if [[ $file != *.@(sig?(n)|asc) ]]; then
		return 1
	fi

	printf "    %s ... " "${file%.*}" >&2

	if ! file="$(get_filepath "$netfile")"; then
		printf '%s\n' "$(gettext "SIGNATURE NOT FOUND")" >&2
		errors=1
		return 1
	fi

	found=0
	for ext in "" gz bz2 xz lrz lzo Z; do
		if sourcefile="$(get_filepath "${file%.*}${ext:+.$ext}")"; then
			found=1
			break
		fi
	done
	if (( ! found )); then
		printf '%s\n' "$(gettext "SOURCE FILE NOT FOUND")" >&2
		errors=1
		return 1
	fi

	case "$ext" in
		gz)  decompress="gzip -c -d -f" ;;
		bz2) decompress="bzip2 -c -d -f" ;;
		xz)  decompress="xz -c -d" ;;
		lrz) decompress="lrzip -q -d" ;;
		lzo) decompress="lzop -c -d -q" ;;
		Z)   decompress="uncompress -c -f" ;;
		"")  decompress="cat" ;;
	esac

	$decompress < "$sourcefile" | gpg --quiet --batch --status-file "$statusfile" --verify "$file" - 2> /dev/null
	return 0
}

verify_git_signature() {
	local netfile=$1 statusfile=$2
	local dir fragment query fragtype fragval

	dir=$(get_filepath "$netfile")
	fragment=$(get_uri_fragment "$netfile")
	query=$(get_uri_query "$netfile")

	if [[ $query != signed ]]; then
		return 1
	fi

	case ${fragment%%=*} in
		tag)
			fragtype=tag
			fragval=${fragment##*=}
			;;
		commit|branch)
			fragtype=commit
			fragval=${fragment##*=}
			;;
		'')
			fragtype=commit
			fragval=HEAD
	esac

	printf "    %s git repo ... " "${dir##*/}" >&2

	git -C "$dir" verify-$fragtype --raw "$fragval" > "$statusfile" 2>&1
	if ! grep -qs NEWSIG "$statusfile"; then
		printf '%s\n' "$(gettext "SIGNATURE NOT FOUND")" >&2
		errors=1
		return 1
	fi
	return 0
}

parse_gpg_statusfile() {
	local type arg1 arg6 arg10

	while read -r _ type arg1 _ _ _ _ arg6 _ _ _ arg10 _; do
		case "$type" in
			GOODSIG)
				pubkey=$arg1
				success=1
				status="good"
				;;
			EXPSIG)
				pubkey=$arg1
				success=1
				status="expired"
				;;
			EXPKEYSIG)
				pubkey=$arg1
				success=1
				status="expiredkey"
				;;
			REVKEYSIG)
				pubkey=$arg1
				success=0
				status="revokedkey"
				;;
			BADSIG)
				pubkey=$arg1
				success=0
				status="bad"
				;;
			ERRSIG)
				pubkey=$arg1
				success=0
				if [[ $arg6 == 9 ]]; then
					status="missingkey"
				else
					status="error"
				fi
				;;
			VALIDSIG)
				if [[ $arg10 ]]; then
					# If the file was signed with a subkey, arg10 contains
					# the fingerprint of the primary key
					fingerprint=$arg10
				else
					fingerprint=$arg1
				fi
				;;
			TRUST_UNDEFINED|TRUST_NEVER)
				trusted=0
				;;
			TRUST_MARGINAL|TRUST_FULLY|TRUST_ULTIMATE)
				trusted=1
				;;
		esac
	done < "$1"
}

source_has_signatures() {
	local netfile all_sources proto

	get_all_sources_for_arch 'all_sources'
	for netfile in "${all_sources[@]}"; do
		proto="$(get_protocol "$netfile")"
		query=$(get_uri_query "$netfile")

		if [[ ${netfile%%::*} = *.@(sig?(n)|asc) ]] || \
				( declare -f verify_${proto}_signature > /dev/null && [[ $query = signed ]] ); then
			return 0
		fi
	done
	return 1
}