chiark / gitweb /
Programs invoke themselves via `userv' if necessary.
[distorted-keys] / keyfunc.sh.in
CommitLineData
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1### -*-sh-*-
2###
3### Common key management functions.
4###
5### (c) 2011 Mark Wooding
6###
7
8###----- Licensing notice ---------------------------------------------------
9###
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10### This file is part of the distorted.org.uk key management suite.
11###
12### distorted-keys is free software; you can redistribute it and/or modify
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13### it under the terms of the GNU General Public License as published by
14### the Free Software Foundation; either version 2 of the License, or
15### (at your option) any later version.
16###
599c8f75 17### distorted-keys is distributed in the hope that it will be useful,
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18### but WITHOUT ANY WARRANTY; without even the implied warranty of
19### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20### GNU General Public License for more details.
21###
22### You should have received a copy of the GNU General Public License
599c8f75 23### along with distorted-keys; if not, write to the Free Software Foundation,
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24### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25
26quis=${0##*/}
27
28###--------------------------------------------------------------------------
29### Configuration variables.
30
e787e19c 31## Automatically configured pathnames.
53263601 32PACKAGE="@PACKAGE@" VERSION="@VERSION@"
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33bindir="@bindir@"
34
e787e19c 35## Read user configuration.
c47f2aba 36if [ -f $ETC/keys.conf ]; then . $ETC/keys.conf; fi
599c8f75 37
e787e19c 38## Maybe turn on debugging.
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39case "${KEYS_DEBUG+t}" in t) set -x ;; esac
40
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41## Fake up caller credentials if not called via userv.
42case "${USERV_USER+t}" in
43 t) ;;
44 *) USERV_USER=${LOGNAME-${USER-$(id -un)}} USERV_UID=$(id -u) ;;
45esac
46case "${USERV_GROUP+t}" in
47 t) ;;
48 *) USERV_GROUP=$(id -Gn) USERV_GID=$(id -gn) ;;
49esac
50
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51###--------------------------------------------------------------------------
52### Cleanup handling.
53
54cleanups=""
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55cleanup () { cleanups=${cleanups+$cleanups }$1; }
56runcleanups () { for i in $cleanups; do $i; done; }
57trap 'rc=$?; runcleanups; exit $rc' EXIT
58trap 'trap "" EXIT; runcleanups; exit 127' INT TERM
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59
60###--------------------------------------------------------------------------
61### Utility functions.
62
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63reqsafe () {
64 ## Fail unless a safe directory is set.
65
66 err="$quis: (CONFIGURATION ERROR)"
67 case ${SAFE+t} in
68 t) ;;
69 *) echo >&2 "$err: no SAFE directory"; exit 1 ;;
70 esac
71 if [ ! -d "$SAFE" ]; then
72 echo >&2 "$err: SAFE path \`$SAFE' isn't a directory"
73 exit 1
74 fi
75 case "$SAFE" in
76 [!/]* | *[][[:space:]*?]*)
77 echo >&2 "$err: SAFE path \`$SAFE' contains bad characters"
78 exit 1
79 ;;
80 esac
81 ls -ld "$SAFE" | {
82 me=$(id -un)
83 read perm _ user stuff
84 case "$perm:$user" in
85 d???------:"$me") ;;
86 *)
87 echo >&2 "$err: SAFE path \`$SAFE' has bad owner or permissions"
88 exit 1
89 ;;
90 esac
91 }
92}
93
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94## Temporary directory.
95unset tmp
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96rmtmp () { case ${tmp+t} in t) cd /; rm -rf $tmp ;; esac; }
97cleanup rmtmp
53263601 98mktmp () {
c47f2aba 99 ## Make a temporary directory and store its name in `tmp'.
53263601 100
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101 case "${tmp+t}" in t) return ;; esac
102 reqsafe
103 tmp="$SAFE/keys.tmp.$$"
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104 rm -rf "$tmp"
105 mkdir -m700 "$tmp"
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106}
107
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108reqtmp () {
109 ## Fail unless a temporary directory is set.
53263601 110
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111 case ${tmp+t} in
112 t) ;;
113 *) echo >&2 "$quis (INTERNAL): no tmp directory set"; exit 127 ;;
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114 esac
115}
116
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117parse_keylabel () {
118 key=$1
119 ## Parse the key label string KEY. Set `kdir' to the base path to use for
120 ## the key's storage, and `kowner' to the key owner's name.
121
122 case "$key" in
123 *:*) kowner=${key%%:*} klabel=${key#*:} ;;
124 *) kowner=$USERV_USER klabel=$key ;;
53263601 125 esac
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126 checkword "key owner name" "$kowner"
127 checklabel "key" "$klabel"
128 kdir=$KEYS/store/$kowner/$klabel
129 knub=$KEYS/nub/$kowner/$klabel
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130}
131
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132runas () {
133 user=$1 service=$2; shift 2
134 ## If the current (effective) user is not USER then reinvoke via `userv',
135 ## as the specified service, with the remaining arguments.
136
137 case $(id -un) in
138 "$user") ;;
139 *) exec userv "$user" "$service" "$@" ;;
140 esac
141}
142
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143###--------------------------------------------------------------------------
144### Input validation functions.
145
146nl="
147"
148check () {
149 ckwhat=$1 ckpat=$2 thing=$3
150 ## Verify that THING matches the (anchored, basic) regular expression
151 ## CKPAT. Since matching newlines is hard to do portably, also check that
152 ## THING doesn't contain any. If the checks fail, report an error and
153 ## exit.
154
155 validp=t
599c8f75 156 case "$thing" in
c47f2aba 157 *"$nl"*) validp=nil ;;
11c7b588 158 *) if ! expr >/dev/null "Q$thing" : "Q$ckpat\$"; then validp=nil; fi ;;
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159 esac
160 case $validp in
161 nil) echo >&2 "$quis: bad $ckwhat \`$thing'"; exit 1 ;;
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162 esac
163}
164
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165## Regular expressions for validating input.
166R_IDENTCHARS="A-Za-z0-9_"
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167R_GOODPUNCT="!%@+="
168R_WORDCHARS="-$R_IDENTCHARS$R_GOODPUNCT"
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169R_IDENT="[$R_IDENTCHARS][$R_IDENTCHARS]*"
170R_WORD="[$R_WORDCHARS][$R_WORDCHARS]*"
09c56d3e 171R_ACLCHARS="][$R_IDENTCHARS$R_GOODPUNCT*?:.#"
c47f2aba 172R_WORDSEQ="[$R_WORDCHARS[:space:]][$R_WORDCHARS[:space:]]*"
09c56d3e 173R_ACL="[$R_ACLCHARS[:space:]-][$R_ACLCHARS[:space:]-]*"
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174R_NUMERIC='\(\([1-9][0-9]*\)\{0,1\}0\{0,1\}\)'
175R_LABEL="\($R_WORD\(/$R_WORD\)*\)"
176R_LINE=".*"
177
178## Various validation functions.
179checknumber () { check "$1" "$R_NUMERIC" "$2"; }
180checkident () { check "$1" "$R_IDENT" "$2"; }
181checkword () { check "$1" "$R_WORD" "$2"; }
182checklabel () { check "$1 label" "$R_LABEL" "$2"; }
183
53263601 184###--------------------------------------------------------------------------
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185### Key storage and properties.
186
187getsysprofile () {
188 profile=$1
189 ## Write the named system PROFILE to standard output.
190
b65e1f93 191 $bindir/extract-profile "$profile" $ETC/profile.d/
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192}
193
194setprops () {
195 what=$1 prefix=$2; shift 2
196 ## Set variables based on the NAME=VALUE assignments in the arguments. The
197 ## value for property NAME is stored in the shell variable PREFIX_NAME.
198
199 for assg in "$@"; do
200 goodp=t
201 case "$assg" in
202 *\=*) name=${assg%%=*} value=${assg#*=} ;;
203 *) goodp=nil ;;
204 esac
205 case "$goodp,$name" in t,*[!0-9A-Za-z_]*=*) goodp=nil ;; esac
206 case "$goodp" in
207 nil) echo >&2 "$quis: bad $what assignment \`$assg'"; exit 1 ;;
208 esac
209 eval "$prefix$name=\$value"
210 done
211}
53263601 212
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213checkprops () {
214 whatprop=$1 prefix=$2; shift 2
215 ## Check that property variables are set in accordance with the remaining
216 ## TABLE arguments. Each row of TABLE has the form
53263601 217 ##
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218 ## NAME OMIT PAT
219 ##
220 ## A table row is satisfied if there is a variable PREFIXNAME whose value
221 ## matces the (basic) regular expression PAT, or if the variable is unset
222 ## and OMIT is `t'.
223
224 for table in "$@"; do
225 case "$table" in ?*) ;; *) continue ;; esac
226 while read -r name omit pat; do
227 eval foundp=\${$prefix$name+t}
228 case "$foundp,$omit" in
229 ,t) continue ;;
230 ,nil)
231 echo >&2 "$quis: missing $whatprop \`$name' required"
232 exit 1
233 ;;
234 esac
235 eval value=\$$prefix$name
236 check "value for $whatprop \`$name'" "$pat" "$value"
237 done <<EOF
238$table
239EOF
240 done
241}
53263601 242
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243defprops () {
244 name=$1
245 ## Define a properties table NAME.
246
247 table=$(cat)
248 eval $name=\$table
249}
250
251defprops g_props <<EOF
252type nil $R_IDENT
253recovery t $R_WORDSEQ
254random t $R_WORD
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255nub_hash t $R_WORD
256nubid_hash t $R_WORD
257nub_random_bytes t $R_NUMERIC
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258acl_encrypt t $R_ACL
259acl_decrypt t $R_ACL
260acl_sign t $R_ACL
261acl_verify t $R_ACL
262acl_info t $R_ACL
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263EOF
264
265readprops () {
266 file=$1
267 ## Read a profile from a file. This doesn't check the form of the
268 ## filename, so it's not suitable for unchecked input. Properties are set
269 ## using `setprops' with prefix `kprop_'.
270
271 ## Parse the settings from the file.
272 exec 3<"$file"
273 while read line; do
274 case "$line" in "" | \#*) continue ;; esac
275 setprops "property" kprop_ "$line"
276 done <&3
277 exec 3>&-
278 checkprops "property" kprop_ "$g_props"
279
280 ## Fetch the key-type handling library.
281 if [ ! -f $KEYSLIB/ktype.$kprop_type ]; then
282 echo >&2 "$quis: unknown key type \`$kprop_type'"
283 exit 1
284 fi
285 . $KEYSLIB/ktype.$kprop_type
286 checkprops "property" kprop_ "$k_props"
287}
288
289readmeta () {
290 kdir=$1
291 ## Read key metadata from KDIR.
292
293 { read profile; } <"$kdir"/meta
294}
295
296makenub () {
297 ## Generate a key nub in the default way, and write it to standard output.
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298 ## The properties `random', `nub_random_bytes' and `nub_hash' are referred
299 ## to.
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300
301 dd 2>/dev/null \
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302 if=/dev/${kprop_random-random} bs=1 count=${kprop_nub_random_bytes-64} |
303 openssl dgst -${kprop_nub_hash-sha256} -binary |
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304 openssl base64
305}
306
307nubid () {
308 ## Compute a hash of the key nub in stdin, and write it to stdout in hex.
2a877b7f 309 ## The property `nubid_hash' is used.
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310
311 { echo "distorted-keys nubid"; cat -; } |
2a877b7f 312 openssl dgst -${kprop_nubid_hash-sha256}
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313}
314
315subst () {
316 what=$1 templ=$2 prefix=$3 pat=$4
317 ## Substitute option values into the template TEMPL. Each occurrence of
318 ## %{VAR} is replaced by the value of the variable PREFIXVAR. Finally, an
319 ## error is reported unless the final value matches the regular expression
320 ## PAT.
321
322 out=""
323 rest=$templ
324 while :; do
325
326 ## If there are no more markers to substitute, then finish.
327 case "$rest" in *"%{"*"}"*) ;; *) out=$out$rest; break ;; esac
328
329 ## Split the template into three parts.
330 left=${rest%%\%\{*} right=${rest#*\%\{}
331 var=${right%%\}*} rest=${right#*\}}
332 case "$var" in
333 *-*) default=${var#*-} var=${var%%-*} defaultp=t ;;
334 *) defaultp=nil ;;
335 esac
336
337 ## Find the variable value.
338 checkident "template variable name" "$var"
339 eval foundp=\${$prefix$var+t}
340 case $foundp,$defaultp in
341 t,*) eval value=\$$prefix$var ;;
342 ,t) value=$default ;;
343 *)
344 echo >&2 "$quis: option \`$var' unset, used in template \`$templ'"
345 exit 1
346 ;;
347 esac
348
349 ## Do the substitution.
350 out=$out$left$value
351 done
352
353 ## Check the final result.
354 check "$what" "$pat" "$out"
355
356 ## Done.
357 echo "$out"
358}
359
360read_profile () {
e9cf7079 361 owner=$1 profile=$2
c47f2aba 362 ## Read property settings from a profile. The PROFILE name has the form
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363 ## [USER:]LABEL; USER defaults to OWNER. Properties are set using
364 ## `setprops' with prefix `kprop_'.
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365
366 reqtmp
367 case "$profile" in
368 :*)
369 label=${profile#:} uservp=nil
370 ;;
53263601 371 *)
e9cf7079 372 user=$kowner label=$profile uservp=t
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373 ;;
374 *:*)
375 user=${profile%%:*} label=${profile#*:} uservp=t
376 ;;
377 esac
378 checkword "profile label" "$label"
379
380 ## Fetch the profile settings from the user.
381 reqtmp
382 case $uservp in
383 t)
384 checkword "profile user" "$user"
385 userv "$user" cryptop-profile "$label" >$tmp/profile
386 ;;
387 nil)
b65e1f93 388 $bindir/extract-profile "$label" $ETC/profile.d/ >$tmp/profile
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389 ;;
390 esac
391
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392 ## Read the file.
393 readprops $tmp/profile
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394}
395
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396###--------------------------------------------------------------------------
397### General crypto operations.
398
399c_genkey () {
400 profile=$1 kdir=$2 knub=$3 hook=$4; shift 4
401 ## Generate a key, and associate it with the named PROFILE (which is
402 ## assumed already to have been read!); store the main data in KDIR, and
403 ## the nub separately in the file KNUB; run HOOK after generation, passing
404 ## it the working key directory and nub file. Remaining arguments are
405 ## options to the key type.
406
407 ## Set options and check them.
408 setprops "option" kopt_ "$@"
409 checkprops "option" kopt_ "$k_genopts"
410
411 ## Create directory structure and start writing metadata.
412 rm -rf "$kdir.new"
413 mkdir -m755 -p "$kdir.new"
414 case "$knub" in */*) mkdir -m700 -p "${knub%/*}" ;; esac
415 cat >"$kdir.new/meta" <<EOF
416$profile
417EOF
53263601 418
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419 ## Generate the key.
420 umask=$(umask); umask 077; >"$knub.new"; umask $umask
421 k_generate "$kdir.new" "$knub.new"
422 $hook "$kdir.new" "$knub.new"
423
424 ## Hash the nub.
425 nubid <"$knub.new" >"$kdir.new/nubid"
426
427 ## Juggle everything into place. Doing this atomically is very difficult,
428 ## and requires more machinery than I can really justify here. If
429 ## something goes wrong halfway, it should always be possible to fix it,
430 ## either by backing out (if $kdir.new still exists) or pressing on
431 ## forwards (if not).
432 rm -rf "$kdir.old"
433 if [ -e "$kdir" ]; then mv "$kdir" "$kdir.old"; fi
434 mv "$kdir.new" "$kdir"
435 mv "$knub.new" "$knub"
436 rm -rf "$kdir.old"
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437}
438
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439c_encrypt () { k_encrypt "$@"; }
440c_decrypt () {
441 if k_decrypt "$@" >$tmp/plain; then cat $tmp/plain
442 else return $?
443 fi
444}
445c_sign () { k_sign "$@"; }
446c_verify () { k_verify "$@"; }
447
448## Stub implementations.
449notsupp () { op=$1; echo >&2 "$quis: operation \`$op' not supported"; }
450k_info () { :; }
451k_encrypt () { notsupp encrypt; }
452k_decrypt () { notsupp decrypt; }
453k_sign () { notsupp sign; }
454k_verify () { notsupp verify; }
455
456prepare () {
457 key=$1 op=$2
458 ## Prepare for a crypto operation OP, using the KEY. This validates the
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459 ## key label, reads the profile, and checks the access-control list. If OP
460 ## is `-' then allow the operation unconditionally.
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461
462 ## Find the key properties.
463 parse_keylabel "$key"
464 if [ ! -d $kdir ]; then echo >&2 "$quis: unknown key \`$key'"; exit 1; fi
465 readmeta $kdir
e9cf7079 466 read_profile $kowner "$profile"
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467
468 ## Check whether we're allowed to do this thing. This is annoyingly
469 ## fiddly.
5cff41ea 470 case $op in -) return ;; esac
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471 eval acl=\${kprop_acl_$op-!owner}
472 verdict=forbid
473 while :; do
474
475 ## Remove leading whitespace.
476 while :; do
477 case "$acl" in
478 [[:space:]]*) acl=${acl#?} ;;
479 *) break ;;
480 esac
481 done
482
483 ## If there's nothing left, leave.
484 case "$acl" in ?*) ;; *) break ;; esac
485
486 ## Split off the leading word.
487 case "$acl" in
488 *[[:space:]]*) word=${acl%%[[:space:]]*} acl=${acl#*[[:space:]]} ;;
489 *) word=$acl acl="" ;;
490 esac
491
492 ## See what sense it has if it matches.
493 case "$word" in
494 -*) sense=forbid rest=${word#-} ;;
495 *) sense=allow rest=$word ;;
496 esac
497
498 ## See whether the calling user matches.
499 case "$rest" in
500 !owner) pat=$kowner list=$USERV_USER ;;
501 !*) echo >&2 "$quis: unknown ACL token \`$word'" ;;
502 %*) pat=${rest#%} list="$USERV_GROUP $USERV_GID" ;;
503 *) pat=$rest list="$USERV_USER $USERV_UID" ;;
504 esac
505 matchp=nil
506 for i in $list; do case "$i" in $pat) matchp=t; break ;; esac; done
507 case $matchp in t) verdict=$sense; break ;; esac
508 done
509
510 case $verdict in
68023101 511 forbid) echo >&2 "$quis: $op access to key \`$key' forbidden"; exit 1 ;;
c47f2aba 512 esac
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513}
514
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515###--------------------------------------------------------------------------
516### Crypto operations for infrastructure purposes.
517
518c_sysprofile () {
519 profile=$1
520 ## Select the profile in FILE for future crypto operations.
53263601 521
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522 unset $(set | sed -n '/^kprop_/s/=.*$//p')
523 reqtmp
524 getsysprofile "$profile" >$tmp/profile
525 readprops $tmp/profile
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526}
527
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528c_gensyskey () {
529 profile=$1 kdir=$2 knub=$3; shift 3
530 ## Generate a system key using PROFILE; store the data in KDIR and the nub
531 ## in KNUB. Remaining arguments are options.
53263601 532
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533 c_sysprofile "$profile"
534 c_genkey "$profile" "$kdir" "$knub" : "$@"
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535}
536
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537c_sysprepare () {
538 kdir=$1
539 readmeta "$kdir"
540 c_sysprofile "$profile"
541}
599c8f75 542
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543c_sysop () {
544 op=$1 kdir=$2; shift 1
545 c_sysprepare "$kdir"
546 c_$op "$@"
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547}
548
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549c_sysencrypt () { c_sysop encrypt "$1" /dev/null; }
550c_sysdecrypt () { c_sysop decrypt "$1" "$2"; }
551c_syssign () { c_sysop sign "$1" "$2"; }
552c_sysverify () { c_sysop verify "$1" /dev/null; }
553
554###--------------------------------------------------------------------------
555### Recovery operations.
556
557stash () {
558 recov=$1 label=$2
559 ## Stash a copy of stdin encrypted under the recovery key RECOV, with a
560 ## given LABEL.
561 checkword "recovery key label" "$recov"
562 checklabel "secret" "$label"
563
564 rdir=$KEYS/recov/$recov/current
565 if [ ! -d $rdir/store ]; then
566 echo >&2 "$quis: unknown recovery key \`$recov'"
567 exit 1
568 fi
569 case $label in */*) mkdir -m755 -p $rdir/${label%/*} ;; esac
570 (c_sysencrypt $rdir/store >$rdir/$label.new)
571 mv $rdir/$label.new $rdir/$label.recov
572}
599c8f75 573
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574recover () {
575 recov=$1 label=$2
576 ## Recover a stashed secret, protected by RECOV and stored as LABEL, and
577 ## write it to stdout.
578 checkword "recovery key label" "$recov"
579 checklabel "secret" "$label"
580
581 rdir=$KEYS/recov/$recov/current
582 if [ ! -f $rdir/$label.recov ]; then
583 echo >&2 "$quis: no blob for \`$label' under recovery key \`$recov'"
584 exit 1
585 fi
586 reqsafe
587 nub=$SAFE/keys.reveal/$recov.current/nub
588 if [ ! -f $nub ]; then
589 echo >&2 "$quis: current recovery key \`$recov' not revealed"
590 exit 1;
591 fi
592 mktmp
593 c_sysdecrypt $rdir/store $nub <$rdir/$label.recov
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594}
595
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596###--------------------------------------------------------------------------
597### Help text.
598
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599defhelp () {
600 read umsg
601 usage="usage: $quis${umsg+ }$umsg"
602 help=$(cat)
603 case "$KEYS_HELP" in t) help; exit ;; esac
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604}
605
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606help () { showhelp; }
607showhelp () {
608 cat <<EOF
609$usage
610
611$help
612EOF
613}
614
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615usage_err () { echo >&2 "$usage"; exit 1; }
616
617###--------------------------------------------------------------------------
618### Subcommand handling.
619
620version () {
621 echo "$PACKAGE version $VERSION"
622}
623
624cmd_help () {
625 rc=0
626 version
627 case $# in
628 0)
629 cat <<EOF
630
631$usage
632
633Options:
634 -h Show this help text.
635 -v Show the program version number.
636
637Commands installed:
638EOF
639 cd "$KEYSLIB"
640 for i in $prefix.*; do
641 if [ ! -x "$i" ]; then continue; fi
642 sed -n "/<<HELP/{n;s/^/ ${i#$prefix.} /;p;q;}" "$i"
643 done
644 ;;
645 *)
646 for i in "$@"; do
647 echo
648 if [ ! -x "$KEYSLIB/$prefix.$i" ]; then
649 echo >&2 "$quis: unrecognized command \`$i'"
650 rc=1
651 continue
652 elif ! KEYS_HELP=t "$KEYSLIB/$prefix.$i"; then
653 rc=1
654 fi
655 done
656 ;;
657 esac
658 return $rc
659}
660
661dispatch () {
662 case $# in 0) echo >&2 "$usage"; exit 1 ;; esac
663 cmd=$1; shift
664 case "$cmd" in help) cmd_help "$@"; exit ;; esac
665 if [ ! -x "$KEYSLIB/$prefix.$cmd" ]; then
666 echo >&2 "$quis: unrecognized command \`$cmd'"
667 exit 1
668 fi
669
670 unset KEYS_HELP
671 exec "$KEYSLIB/$prefix.$cmd" "$@"
672}
673
53263601 674###----- That's all, folks --------------------------------------------------