xref: /freebsd/usr.sbin/certctl/certctl.sh (revision aa1a8ff2d6dbc51ef058f46f3db5a8bb77967145) 
1#!/bin/sh
2#-
3# SPDX-License-Identifier: BSD-2-Clause
4#
5# Copyright 2018 Allan Jude <allanjude@freebsd.org>
6#
7# Redistribution and use in source and binary forms, with or without
8# modification, are permitted providing that the following conditions
9# are met:
10# 1. Redistributions of source code must retain the above copyright
11#    notice, this list of conditions and the following disclaimer.
12# 2. Redistributions in binary form must reproduce the above copyright
13#    notice, this list of conditions and the following disclaimer in the
14#    documentation and/or other materials provided with the distribution.
15#
16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
25# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26# POSSIBILITY OF SUCH DAMAGE.
27#
28
29set -u
30
31############################################################ CONFIGURATION
32
33: ${DESTDIR:=}
34: ${DISTBASE:=}
35
36############################################################ GLOBALS
37
38SCRIPTNAME="${0##*/}"
39ERRORS=0
40NOOP=false
41UNPRIV=false
42VERBOSE=false
43
44############################################################ FUNCTIONS
45
46info()
47{
48	echo "${0##*/}: $@" >&2
49}
50
51verbose()
52{
53	if "${VERBOSE}" ; then
54		info "$@"
55	fi
56}
57
58perform()
59{
60	if ! "${NOOP}" ; then
61		"$@"
62	fi
63}
64
65cert_files_in()
66{
67	find -L "$@" -type f \( \
68	     -name '*.pem' -or \
69	     -name '*.crt' -or \
70	     -name '*.cer' \
71	\) 2>/dev/null
72}
73
74eolcvt()
75{
76	cat "$@" | tr -s '\r' '\n'
77}
78
79do_hash()
80{
81	local hash
82
83	if hash=$(openssl x509 -noout -subject_hash -in "$1") ; then
84		echo "$hash"
85		return 0
86	else
87		info "Error: $1"
88		ERRORS=$((ERRORS + 1))
89		return 1
90	fi
91}
92
93get_decimal()
94{
95	local checkdir hash decimal
96
97	checkdir=$1
98	hash=$2
99	decimal=0
100
101	while [ -e "$checkdir/$hash.$decimal" ] ; do
102		decimal=$((decimal + 1))
103	done
104
105	echo ${decimal}
106	return 0
107}
108
109create_trusted()
110{
111	local hash certhash otherfile otherhash
112	local suffix
113	local link=${2:+-lrs}
114
115	hash=$(do_hash "$1") || return
116	certhash=$(openssl x509 -sha1 -in "$1" -noout -fingerprint)
117	for otherfile in $(find $UNTRUSTDESTDIR -name "$hash.*") ; do
118		otherhash=$(openssl x509 -sha1 -in "$otherfile" -noout -fingerprint)
119		if [ "$certhash" = "$otherhash" ] ; then
120			info "Skipping untrusted certificate $hash ($otherfile)"
121			return 0
122		fi
123	done
124	for otherfile in $(find $CERTDESTDIR -name "$hash.*") ; do
125		otherhash=$(openssl x509 -sha1 -in "$otherfile" -noout -fingerprint)
126		if [ "$certhash" = "$otherhash" ] ; then
127			verbose "Skipping duplicate entry for certificate $hash"
128			return 0
129		fi
130	done
131	suffix=$(get_decimal "$CERTDESTDIR" "$hash")
132	verbose "Adding $hash.$suffix to trust store"
133	perform install ${INSTALLFLAGS} -m 0444 ${link} \
134		"$(realpath "$1")" "$CERTDESTDIR/$hash.$suffix"
135}
136
137# Accepts either dot-hash form from `certctl list` or a path to a valid cert.
138resolve_certname()
139{
140	local hash srcfile filename
141	local suffix
142
143	# If it exists as a file, we'll try that; otherwise, we'll scan
144	if [ -e "$1" ] ; then
145		hash=$(do_hash "$1") || return
146		srcfile=$(realpath "$1")
147		suffix=$(get_decimal "$UNTRUSTDESTDIR" "$hash")
148		filename="$hash.$suffix"
149		echo "$srcfile" "$hash.$suffix"
150	elif [ -e "${CERTDESTDIR}/$1" ] ;  then
151		srcfile=$(realpath "${CERTDESTDIR}/$1")
152		hash=$(echo "$1" | sed -Ee 's/\.([0-9])+$//')
153		suffix=$(get_decimal "$UNTRUSTDESTDIR" "$hash")
154		filename="$hash.$suffix"
155		echo "$srcfile" "$hash.$suffix"
156	fi
157}
158
159create_untrusted()
160{
161	local srcfile filename
162	local link=${2:+-lrs}
163
164	set -- $(resolve_certname "$1")
165	srcfile=$1
166	filename=$2
167
168	if [ -z "$srcfile" -o -z "$filename" ] ; then
169		return
170	fi
171
172	verbose "Adding $filename to untrusted list"
173	perform install ${INSTALLFLAGS} -m 0444 ${link} \
174		"$srcfile" "$UNTRUSTDESTDIR/$filename"
175}
176
177do_scan()
178{
179	local CFUNC CSEARCH CPATH CFILE CERT SPLITDIR
180	local oldIFS="$IFS"
181	CFUNC="$1"
182	CSEARCH="$2"
183
184	IFS=:
185	set -- $CSEARCH
186	IFS="$oldIFS"
187	for CFILE in $(cert_files_in "$@") ; do
188		verbose "Reading $CFILE"
189		case $(eolcvt "$CFILE" | egrep -c '^-+BEGIN CERTIFICATE-+$') in
190		0)
191			;;
192		1)
193			"$CFUNC" "$CFILE" link
194			;;
195		*)
196			verbose "Multiple certificates found, splitting..."
197			SPLITDIR=$(mktemp -d)
198			eolcvt "$CFILE" | egrep '^(---|[0-9A-Za-z/+=]+$)' | \
199				split -p '^-+BEGIN CERTIFICATE-+$' - "$SPLITDIR/x"
200			for CERT in $(find "$SPLITDIR" -type f) ; do
201				"$CFUNC" "$CERT"
202			done
203			rm -rf "$SPLITDIR"
204			;;
205		esac
206	done
207}
208
209do_list()
210{
211	local CFILE subject
212
213	for CFILE in $(find "$@" \( -type f -or -type l \) -name '*.[0-9]') ; do
214		if [ ! -s "$CFILE" ] ; then
215			info "Unable to read $CFILE"
216			ERRORS=$((ERRORS + 1))
217			continue
218		fi
219		subject=
220		if ! "$VERBOSE" ; then
221			subject=$(openssl x509 -noout -subject -nameopt multiline -in "$CFILE" | sed -n '/commonName/s/.*= //p')
222		fi
223		if [ -z "$subject" ] ; then
224			subject=$(openssl x509 -noout -subject -in "$CFILE")
225		fi
226		printf "%s\t%s\n" "${CFILE##*/}" "$subject"
227	done
228}
229
230cmd_rehash()
231{
232
233	if [ -e "$CERTDESTDIR" ] ; then
234		perform find "$CERTDESTDIR" \( -type f -or -type l \) -delete
235	else
236		perform install -d -m 0755 "$CERTDESTDIR"
237	fi
238	if [ -e "$UNTRUSTDESTDIR" ] ; then
239		perform find "$UNTRUSTDESTDIR" \( -type f -or -type l \) -delete
240	else
241		perform install -d -m 0755 "$UNTRUSTDESTDIR"
242	fi
243
244	do_scan create_untrusted "$UNTRUSTPATH"
245	do_scan create_trusted "$TRUSTPATH"
246}
247
248cmd_list()
249{
250	info "Listing Trusted Certificates:"
251	do_list "$CERTDESTDIR"
252}
253
254cmd_untrust()
255{
256	local UTFILE
257
258	shift # verb
259	perform install -d -m 0755 "$UNTRUSTDESTDIR"
260	for UTFILE in "$@"; do
261		info "Adding $UTFILE to untrusted list"
262		create_untrusted "$UTFILE"
263	done
264}
265
266cmd_trust()
267{
268	local UTFILE untrustedhash certhash hash
269
270	shift # verb
271	for UTFILE in "$@"; do
272		if [ -s "$UTFILE" ] ; then
273			hash=$(do_hash "$UTFILE")
274			certhash=$(openssl x509 -sha1 -in "$UTFILE" -noout -fingerprint)
275			for UNTRUSTEDFILE in $(find $UNTRUSTDESTDIR -name "$hash.*") ; do
276				untrustedhash=$(openssl x509 -sha1 -in "$UNTRUSTEDFILE" -noout -fingerprint)
277				if [ "$certhash" = "$untrustedhash" ] ; then
278					info "Removing $(basename "$UNTRUSTEDFILE") from untrusted list"
279					perform rm -f $UNTRUSTEDFILE
280				fi
281			done
282		elif [ -e "$UNTRUSTDESTDIR/$UTFILE" ] ; then
283			info "Removing $UTFILE from untrusted list"
284			perform rm -f "$UNTRUSTDESTDIR/$UTFILE"
285		else
286			info "Cannot find $UTFILE"
287			ERRORS=$((ERRORS + 1))
288		fi
289	done
290}
291
292cmd_untrusted()
293{
294	info "Listing Untrusted Certificates:"
295	do_list "$UNTRUSTDESTDIR"
296}
297
298usage()
299{
300	exec >&2
301	echo "Manage the TLS trusted certificates on the system"
302	echo "	$SCRIPTNAME [-v] list"
303	echo "		List trusted certificates"
304	echo "	$SCRIPTNAME [-v] untrusted"
305	echo "		List untrusted certificates"
306	echo "	$SCRIPTNAME [-nUv] [-D <destdir>] [-d <distbase>] [-M <metalog>] rehash"
307	echo "		Generate hash links for all certificates"
308	echo "	$SCRIPTNAME [-nv] untrust <file>"
309	echo "		Add <file> to the list of untrusted certificates"
310	echo "	$SCRIPTNAME [-nv] trust <file>"
311	echo "		Remove <file> from the list of untrusted certificates"
312	exit 64
313}
314
315############################################################ MAIN
316
317while getopts D:d:M:nUv flag; do
318	case "$flag" in
319	D) DESTDIR=${OPTARG} ;;
320	d) DISTBASE=${OPTARG} ;;
321	M) METALOG=${OPTARG} ;;
322	n) NOOP=true ;;
323	U) UNPRIV=true ;;
324	v) VERBOSE=true ;;
325	esac
326done
327shift $((OPTIND - 1))
328
329DESTDIR=${DESTDIR%/}
330
331if ! [ -z "${CERTCTL_VERBOSE:-}" ] ; then
332	VERBOSE=true
333fi
334: ${METALOG:=${DESTDIR}/METALOG}
335INSTALLFLAGS=
336if "$UNPRIV" ; then
337	INSTALLFLAGS="-U -M ${METALOG} -D ${DESTDIR}"
338fi
339: ${LOCALBASE:=$(sysctl -n user.localbase)}
340: ${TRUSTPATH:=${DESTDIR}${DISTBASE}/usr/share/certs/trusted:${DESTDIR}${LOCALBASE}/share/certs:${DESTDIR}${LOCALBASE}/etc/ssl/certs}
341: ${UNTRUSTPATH:=${DESTDIR}${DISTBASE}/usr/share/certs/untrusted:${DESTDIR}${LOCALBASE}/etc/ssl/untrusted:${DESTDIR}${LOCALBASE}/etc/ssl/blacklisted}
342: ${CERTDESTDIR:=${DESTDIR}${DISTBASE}/etc/ssl/certs}
343: ${UNTRUSTDESTDIR:=${DESTDIR}${DISTBASE}/etc/ssl/untrusted}
344
345[ $# -gt 0 ] || usage
346case "$1" in
347list)		cmd_list ;;
348rehash)		cmd_rehash ;;
349blacklist)	cmd_untrust "$@" ;;
350untrust)	cmd_untrust "$@" ;;
351trust)		cmd_trust "$@" ;;
352unblacklist)	cmd_trust "$@" ;;
353untrusted)	cmd_untrusted ;;
354blacklisted)	cmd_untrusted ;;
355*)		usage # NOTREACHED
356esac
357
358retval=$?
359if [ $ERRORS -gt 0 ] ; then
360	info "Encountered $ERRORS errors"
361fi
362exit $retval
363
364################################################################################
365# END
366################################################################################
367