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