/usr/share/emacs/site-lisp/mailcrypt/mc-gpg.el is in mailcrypt 3.5.9-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 | ;; mc-gpg.el, GPG support for Mailcrypt
;; Copyright (C) 1995 Jin Choi <jin@atype.com>
;; Patrick LoPresti <patl@lcs.mit.edu>
;; 1998 Brian Warner <warner@lothar.com>
;;{{{ Licensing
;; This file is intended to be used with GNU Emacs.
;; 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, 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;}}}
(require 'mailcrypt)
; pieces to do:
; #key lookup?
; #mc-gpg-encrypt-region
; need to deal with untrusted keys, missing keys (offer to fetch), --throw
; #mc-gpg-decrypt-region [anything not clearsigned] (a,as,ae,ase)
; need to implement signature-key fetch, ponder --throw-keyid case
; keys without passphrases, sigs with bad algorithms (ignore sig? warn?)
; #mc-gpg-sign-region (clearsign/notclearsign)
; #mc-gpg-verify-region [clearsigned only] (ok/badsig/missingkey/corruptmsg)
; #mc-gpg-insert-public-key (comment, altkeyring)
; #mc-gpg-snarf-keys (one, multiple, old, corrupt)
; key fetching (is there a GPG key server yet?)
; clean up use of buffers, #kill off old tmp buffers
; in verify-region, print date of signature too
; ~maybe have bad-signature message print keyid/date? (no, sig is invalid,
; ~ anything other than its invalidity is misleading)
; make messages shorter (get it all to fit in echo area)
; enhancements I'd like to add
; trustdb status reporting during encryption/decryption: show the best trust
; path to the recipient/signer?
; completion on local id when signing (--list-secret-keys should know them)
; algorithm preferences, possibly by destination user
; (this is embedded in gpg)
; extra options, possibly by destination user. Maybe for pgp5.0/pgp2.6 compat?
; rfc2015 operation (MIME: application/pgp-signature, etc)
; signature dates are currently reported with just the date. Find a time
; formatting function and use the longtime in the VALIDSIG message.
; mc-gpg-alternate-keyring seems dubious.. have two options, public/private?
; using a shell introduces concerns about quoting and such. If the name of a
; key used as a recipient or as a mc-gpg-user-id (a key to sign with) has a
; double quote or ! or weird stuff, things could break.
; encrypting to a nontrusted key is problematic: when not in --batch mode,
; gpg warns the user and asks if they want to use the key anyway. In --batch
; mode, it fails, even if we give --yes. Worse yet, if we encrypt to multiple
; recipients, the untrusted ones get dropped withou flagging an error (stderr
; does get a message, but it doesn't indicate which keys had a problem)
(defvar mc-gpg-user-id (user-login-name)
"*GPG ID of your default identity.")
(defvar mc-gpg-path "gpg" "*The GPG executable.")
(defvar mc-gpg-display-snarf-output nil
"*If t, pop up the GPG output window when snarfing keys.")
(defvar mc-gpg-always-fetch 'never
"*If t, always fetch missing keys. If 'never, never fetch. If nil,
ask the user.")
(defvar mc-gpg-alternate-keyring nil
"*Public keyring to use instead of default.")
(defvar mc-gpg-comment
(format "Processed by Mailcrypt %s <http://mailcrypt.sourceforge.net/>"
mc-version)
"*Comment field to appear in ASCII armor output. If nil, let GPG use its
default.")
(defconst mc-gpg-msg-begin-line "^-----BEGIN PGP MESSAGE-----\r?$"
"Text for start of GPG message delimiter.")
(defconst mc-gpg-msg-end-line "^-----END PGP MESSAGE-----\r?$"
"Text for end of GPG message delimiter.")
(defconst mc-gpg-signed-begin-line "^-----BEGIN PGP SIGNED MESSAGE-----\r?$"
"Text for start of GPG signed messages.")
(defconst mc-gpg-signed-end-line "^-----END PGP SIGNATURE-----\r?$"
"Text for end of GPG signed messages.")
(defconst mc-gpg-key-begin-line "^-----BEGIN PGP PUBLIC KEY BLOCK-----\r?$"
"Text for start of GPG public key.")
(defconst mc-gpg-key-end-line "^-----END PGP PUBLIC KEY BLOCK-----\r?$"
"Text for end of GPG public key.")
(defvar mc-gpg-extra-args nil
"Extra arguments to pass to all invocations of gpg. Used during debugging to
set --homedir, to use special test keys instead of the developer's normal
keyring.")
(defvar mc-gpg-debug-buffer nil
"A buffer for debugging messages. If nil, no debugging messages are logged.
BEWARE! Sensitive data (including your passphrase) is put here. Set this with:
(setq mc-gpg-debug-buffer (get-buffer-create \"mc debug\"))")
;; we use with-current-buffer for clarity. emacs19 doesn't have it. This
;; code is cribbed from lazy-lock.el which does the same thing
(eval-when-compile
;; We use this for clarity and speed. Borrowed from a future Emacs.
(or (fboundp 'with-current-buffer)
(defmacro with-current-buffer (buffer &rest body)
"Execute the forms in BODY with BUFFER as the current buffer.
The value returned is the value of the last form in BODY."
(` (save-excursion (set-buffer (, buffer)) (,@ body)))))
)
(defun mc-gpg-debug-print (string)
(if (and (boundp 'mc-gpg-debug-buffer) mc-gpg-debug-buffer)
(print string mc-gpg-debug-buffer)))
;; the insert parser will return '(t) and insert the whole of stdout if
;; rc == 0, and will return '(nil rc stderr) if rc != 0
(defun mc-gpg-insert-parser (stdoutbuf stderrbuf statusbuf rc parserdata)
(mc-gpg-debug-print
(format "(mc-gpg-generic-parser stdoutbuf=%s stderrbuf=%s rc=%s"
stdoutbuf stderrbuf rc))
(if (= rc 0)
'(t (t))
(list nil nil rc (with-current-buffer stderrbuf (buffer-string))))
)
;; the null parser returns rc and never inserts anything
(defun mc-gpg-null-parser (stdoutbuf stderrbuf statusbuf rc parserdata)
(list nil rc))
; utility function (variant of mc-process-region):
; take region in current buffer, send as stdin to a process
; maybe send in a passphrase first
; three buffers of output are collected: stdout, stderr, and --status-fd
;
; parser is called with stdoutbuf as the current buffer as
; (parser stdoutbuf stderrbuf statusbuf rc parserdata)
; and is expected to return a list:
; '(REPLACEP RESULT)
;
; if REPLACEP is true, the original buffer's [beg..end] will be replaced by
; the stdout data buffer's contents (all of it). Otherwise the original buffer
; is left alone. RESULT (specifically (cdr parser-return-value)) is returned
; by mc-gpg-process-region.
(defun mc-gpg-process-region (beg end passwd program args parser bufferdummy
&optional parserdata)
(let ((obuf (current-buffer))
(process-connection-type nil)
(shell-file-name "/bin/sh") ;; ??? force? need sh (not tcsh) for "2>"
; other local vars
mybuf
stderr-tempfilename stderr-buf
status-tempfilename status-buf
proc rc status parser-result
)
(mc-gpg-debug-print (format
"(mc-gpg-process-region beg=%s end=%s passwd=%s program=%s args=%s parser=%s bufferdummy=%s)"
beg end passwd program args parser bufferdummy))
(setq stderr-tempfilename
(make-temp-name (expand-file-name "mailcrypt-gpg-stderr-"
mc-temp-directory)))
(setq status-tempfilename
(make-temp-name (expand-file-name "mailcrypt-gpg-status-"
mc-temp-directory)))
(unwind-protect
(progn
;; get output places ready
(setq mybuf (get-buffer-create " *mailcrypt stdout temp"))
(set-buffer mybuf)
(erase-buffer)
;; set the stdout buffer to be multibyte, so it can handle
;; whatever characters come back from GPG. These may be non-ASCII,
;; and unibyte buffers can't handle those correctly. If emacs is
;; in unibyte mode (such as when standard-display-european is
;; active), the multibyte characters will be downgraded to unibyte
;; when they are copied back into the email buffer. iso-latin-1
;; characters will survive this transition, others will not (but
;; then you wouldn't be using standard-display-european anyway).
(set-buffer-multibyte t)
(set-buffer obuf)
(buffer-disable-undo mybuf)
(if passwd
(setq args (append '("--passphrase-fd" "0") args)))
(setq args (append (list (concat "2>" stderr-tempfilename)) args))
(setq args (append (list (concat "3>" status-tempfilename)) args))
(setq args (append '("--status-fd" "3") args))
(if mc-gpg-extra-args
(setq args (append mc-gpg-extra-args args)))
(mc-gpg-debug-print (format "prog is %s, args are %s"
program
(mapconcat '(lambda (x)
(format "'%s'" x))
args " ")))
(setq proc
(apply 'start-process-shell-command "*GPG*" mybuf
program args))
;; send in passwd if necessary
(if passwd
(progn
(process-send-string proc (concat passwd "\n"))
(or mc-passwd-timeout (mc-deactivate-passwd t))))
;; send in the region
(process-send-region proc beg end)
;; finish it off
(process-send-eof proc)
;; wait for it to finish
(while (eq 'run (process-status proc))
(accept-process-output proc 5))
;; remember result codes
(setq status (process-status proc))
(setq rc (process-exit-status proc))
(mc-gpg-debug-print (format "prog finished, rc=%s" rc))
;; Hack to force a status_notify() in Emacs 19.29
(delete-process proc)
;; remove the annoying "yes your process has finished" message
(set-buffer mybuf)
(goto-char (point-max))
(if (re-search-backward "\nProcess \\*GPG.*\n\\'" nil t)
(delete-region (match-beginning 0) (match-end 0)))
(goto-char (point-min))
;; CRNL -> NL
(while (search-forward "\r\n" nil t)
(replace-match "\n"))
;; ponder process death: signal, not just rc!=0
(if (or (eq 'stop status) (eq 'signal status))
;; process died
(error "%s exited abnormally: '%s'" program rc) ;;is rc a string?
)
(if (= 127 rc)
(error "%s could not be found" program) ;; at least on my system
)
;; fill stderr buf
(setq stderr-buf (get-buffer-create " *mailcrypt stderr temp"))
(buffer-disable-undo stderr-buf)
(set-buffer stderr-buf)
(erase-buffer)
(insert-file-contents stderr-tempfilename)
;; fill status buf
(setq status-buf (get-buffer-create " *mailcrypt status temp"))
(buffer-disable-undo status-buf)
(set-buffer status-buf)
(erase-buffer)
(insert-file-contents status-tempfilename)
;; feed the parser
(set-buffer mybuf)
(setq parser-result (funcall parser
mybuf stderr-buf status-buf
rc parserdata))
(mc-gpg-debug-print (format " parser returned %s" parser-result))
;; what did the parser tell us?
(if (car parser-result)
;; yes, replace region
(progn
(set-buffer obuf)
(delete-region beg end)
(goto-char beg)
(insert-buffer-substring mybuf)
))
;; return result
(cdr parser-result)
)
;; cleanup forms
(if (and proc (eq 'run (process-status proc)))
;; it is still running. kill it.
(interrupt-process proc))
(set-buffer obuf)
(delete-file stderr-tempfilename)
(delete-file status-tempfilename)
;; kill off temporary buffers unless we're debugging
(if (or (not (boundp 'mc-gpg-debug-buffer))
(not mc-gpg-debug-buffer))
(progn
(if (get-buffer " *mailcrypt stdout temp")
(kill-buffer " *mailcrypt stdout temp"))
(if (get-buffer " *mailcrypt stderr temp")
(kill-buffer " *mailcrypt stderr temp"))
(if (get-buffer " *mailcrypt status temp")
(kill-buffer " *mailcrypt status temp"))
))
)))
; this lookup is used to turn key identifiers into names suitable for
; presentation to the user. When decrypting, the hex keyid to which the
; incoming message is encrypted is looked up to ask the user for a passphrase
; by name. When encrypting, the user's id (mc-gpg-user-id) is looked up to
; ask for a passphrase, and if mc-gpg-encrypt-to-me is true, the user's id
; is looked up to provide a full name to gpg. gpg is always given full names,
; because the hex keyids it provides might not work for both signing and
; encryption (split keys in gpg/pgp5)
;
;31:warner@zs2-pc4% gpg --list-secret-keys --with-colons --no-greeting
;/home/warner/.gnupg/secring.gpg
;-------------------------------
;sec::1024:17:1FE9CBFDC63B6750:1998-08-04:0:::Brian Warner (temporary GPG key) <warner@lothar.com>:
;ssb::1024:20:C68E8DE9F759FBDE:1998-08-04:0:::
;sec::768:17:16BD446D567E33CF:1998-08-04:0:::signature (sample signature key) <key@key>:
;sec::768:16:D514CB72B37D9AF4:1998-08-04:0:::crypt (crypt) <crypt@crypt>:
;sec::1024:17:4DBDD3258230A3E0:1998-08-04:0:::dummyy <d@d>:
;ssb::1024:20:549B0E6CBBBB43D1:1998-08-04:0:::
;
; we use the whole user id string (Brian..lothar.com>) as USER-ID, and the
; long keyid 1FE9CBFDC63B6750 for KEY-ID
(defvar mc-gpg-key-cache nil
"Association list mapping GPG IDs to canonical \"keys\". A \"key\"
is a pair (USER-ID . KEY-ID) which identifies the canonical IDs of the
GPG ID.")
(defun mc-gpg-lookup-key (str &optional type)
;; Look up the string STR in the user's secret key ring. Return a
;; pair of strings (USER-ID . KEY-ID) which uniquely identifies the
;; matching key, or nil if no key matches.
(let (args)
(if (string= str "***** CONVENTIONAL *****") nil
(let ((result (cdr-safe (assoc str mc-gpg-key-cache)))
(key-regexp
"^\\(sec\\|pub\\):[^:]*:[^:]*:[^:]*:\\([^:]*\\):[^:]*:[^:]*:[^:]*:[^:]*:\\([^:]*\\):"
)
(obuf (current-buffer))
buffer)
(if (null result)
(unwind-protect
(progn
(setq buffer (generate-new-buffer " *mailcrypt temp"))
(setq args (list
"--with-colons"
"--no-greeting" "--batch"
"--list-secret-keys" str
))
(if mc-gpg-alternate-keyring
(setq args (append (list "--keyring"
mc-gpg-alternate-keyring)
args)))
(if mc-gpg-extra-args
(setq args (append mc-gpg-extra-args args)))
(mc-gpg-debug-print
(format "lookup: args are %s" args))
(let ((coding-system-for-read
(if (and (fboundp 'coding-system-p)
(coding-system-p 'utf-8))
'utf-8 nil)))
(apply 'call-process mc-gpg-path nil buffer nil args))
(set-buffer buffer)
(goto-char (point-min))
(if (re-search-forward key-regexp nil t)
(progn
(setq result
(cons (buffer-substring-no-properties
(match-beginning 3) (match-end 3))
(concat
"0x"
(buffer-substring-no-properties
(match-beginning 2) (match-end 2)))))
(setq mc-gpg-key-cache (cons (cons str result)
mc-gpg-key-cache)))))
;(if buffer (kill-buffer buffer))
(set-buffer obuf)))
(if (null result)
(error "No GPG secret key for %s" str))
result))))
;gpg: no info to calculate a trust probability
;gpg: no valid addressees
;gpg: [stdin]: encryption failed: No such user id
(defun mc-gpg-encrypt-region (recipients start end &optional id sign)
(let ((process-environment process-environment)
(buffer (get-buffer-create mc-buffer-name))
(obuf (current-buffer))
action msg args key passwd result gpg-id)
(mc-gpg-debug-print (format
"(mc-gpg-encrypt-region recipients=%s start=%s end=%s id=%s sign=%s)"
recipients start end id sign))
(setq args (list
"--batch" "--armor" "--textmode" "--always-trust"
(if recipients "--encrypt" "--store")
))
(setq action (if recipients "Encrypting" "Armoring"))
(setq msg (format "%s..." action)) ; May get overridden below
(if mc-gpg-comment
(setq args (append (list "--comment" (format "'%s'" mc-gpg-comment))
args)))
(if mc-gpg-alternate-keyring
(setq args (append (list "--keyring" mc-gpg-alternate-keyring) args)))
(if (and (not (eq mc-pgp-always-sign 'never))
(or mc-pgp-always-sign sign (y-or-n-p "Sign the message? ")))
(progn
(setq key (mc-gpg-lookup-key (or id mc-gpg-user-id) 'encrypt))
(setq passwd
(mc-activate-passwd
(cdr key)
(format "GPG passphrase for %s (%s): " (car key) (cdr key))))
(setq args
(append (list "--local-user" (cdr key)
"--sign"
)
args))
(setq msg (format "%s+signing as %s ..." action (car key)))
(if (not recipients)
;; the --store is last in args. remove it. remove --textmode too
(setq args (nreverse (cddr (nreverse args)))))
)
)
; if we're supposed to encrypt for the user too, we need their key
;; FIXME: we only need their public key, not the secret one. Some users
;; (the author included) keep their secret keys offline unless needed
;; (but the public ones are still available).. the --list-secret-keys
;; done by mc-gpg-lookup-key will fail in this situation. Change
;; mc-gpg-lookup-key to have a way to look for public keys too.
(if (and recipients mc-encrypt-for-me)
(setq recipients (cons (cdr (or key
(setq key (mc-gpg-lookup-key
mc-gpg-user-id 'encrypt)))
) recipients)))
; push(@args, map {qq<-r "$_">} @recipients) if @recipients; # roughly
(if recipients
(setq args (append (apply 'append
(mapcar '(lambda (x)
(list "--recipient"
(concat "\"" x "\"")))
recipients))
args)))
(message "%s" msg)
(setq result (mc-gpg-process-region start end passwd mc-gpg-path args
'mc-gpg-insert-parser buffer))
(if (not (car result))
(error "%s failed: %s" msg (nth 2 result)))
t
))
; GPG DECRYPT BEHAVIOR: gnupg-0.9.9 only
; (all status messages are prefixed by "[GNUPG:] "
; signed (not encrypted) by a known key [S.s1v]:
; rc == 0, stdout has message
; status:
; SIG_ID <sigid> <date> <longtime>
; GOODSIG <longkeyid> <username>
; VALIDSIG <keyfingerprint> <date> <longtime>
; TRUST_foo
; signed (not encrypted) by unknown key [S.s4]:
; rc == 2, stdout has message
; status:
; ERRSIG <longkeyid> <pubkeyalgo> <hashalgo> <sigclass> <longtime> <rc>
; NO_PUBKEY <longkeyid>
; encrypted to a private key we don't have [E.e3]:
; rc == 2,
; stderr: gpg: decryption failed: secret key not available
; status:
; ENC_TO <longkeyid> <keytype> <keylength==0>
; NO_SECKEY <longkeyid>
; DECRYPTION_FAILED
; encrypted to us, our key has no passphrase
; rc == 0?
; stderr: gpg: NOTE: secret key foo is NOT protected
; status:
; ENC_TO <longkeyid> <keytype> <keylen==0>
; GOOD_PASSPHRASE
; DECRYPTION_OKAY
; encrypted to us, but we didn't give a passphrase [E.e1r, no pw]:
; rc == 2
; stderr: gpg: fatal: Can't query password in batchmode
; status:
; ENC_TO <longkeyid> <keytype> <keylength==0>
; NEED_PASSPHRASE <longkeyid> <otherlongkeyid> <keytype> <keylen==0>
; MISSSING_PASSPHRASE
; BAD_PASSPHRASE <longkeyid>
; DECRYPTION_FAILED
; (N.B.: gpg cannot tell tell the difference between no passphrase and an
; empty passphrase.)
; encrypted to us *and someone else*, no passphrase [E.e3re1r, no pw]:
; rc == 2?
; stderr: gpg: fatal: Can't query password in batchmode
; status:
; ENC_TO <longkeyid1> <keytype> <keylength==0>
; NEED_PASSPHRASE <longkeyid1> <otherlongkeyid> <keytype> <keylen==0>
; MISSSING_PASSPHRASE
; BAD_PASSPHRASE <longkeyid1>
; ENC_TO <longkeyid2> .. ..
; NO_SECKEY <longkeyid2>
; DECRYPTION_FAILED
; encrypted to us, but we used the wrong passphrase [E.e1r, bad pw]:
; rc == 2
; stderr: gpg: public key decryption failed: [Bb]ad passphrase
; status:
; ENC_TO <longkeyid> <keytype> <keylength==0>
; NEED_PASSPHRASE <longkeyid> <otherlongkeyid> <keytype> <keylen==0>
; BAD_PASSPHRASE <longkeyid>
; DECRYPTION_FAILED
; encrypted to us, good passphrase [E.e1r, good pw]:
; rc == 0, stdout has message
; status:
; ENC_TO <longkeyid> <keytype> <keylength==0>
; NEED_PASSPHRASE <longkeyid> <otherlongkeyid> <keytype> <keylen==0>
; GOOD_PASSPHRASE
; DECRYPTION_OKAY
; encrypted to us, good passphrase, signed by trusted/untrusted party
; [ES.e1r.s1v, good ps]:
; rc == 0, stdout has message
; stderr: gpg: Signature made <date> using DSA key ID <pubkeyid>
; stderr: gpg: Good signature from "<keyname>"
; status:
; ENC_TO <longkeyid> <keytype> <keylength==0>
; NEED_PASSPHRASE <longkeyid> <otherlongkeyid> <keytype> <keylen==0>
; GOOD_PASSPHRASE
; SIG_ID <sigid> <date> <longtime>
; GOODSIG <longkeyid> <username>
; VALIDSIG <keyfingerprint> <date> <longtime>
; TRUST_(UNDEFINED|NEVER|MARGINAL|FULLY|ULTIMATE)
; DECRYPTION_OKAY
; encrypted to us, good passphrase, signed by unknown party [ES.e1r.s4]:
; rc == 2, stdout has message
; stderr: gpg: Signature made <date> using DSA key ID <pubkeyid>
; stderr: gpg: Can't check signature: [Pp]ublic key not found
; status:
; ENC_TO <longkeyid> <keytype> <keylength==0>
; NEED_PASSPHRASE <longkeyid> <otherlongkeyid> <keytype> <keylen==0>
; GOOD_PASSPHRASE
; ERRSIG <longkeyid> <pubkeyalgo> <hashalgo> <sigclass> <longtime> <rc>
; rc: 4 is unknown algorithm, 9 is missing public key
; NO_PUBKEY <longkeyid>
; DECRYPTION_OKAY
; symmetrically encrypted, we didn't give a passphrase
; rc == 2, stderr: gpg: fatal: Can't query password in batchmode
; status:
; NEED_PASSPHRASE_SYM <cipheralgo> <s2kmode> <s2khash>
; MISSING_PASSPHRASE
; DECRYPTION_FAILED
; symmetrically encrypted, we gave the wrong passphrase
; rc == 2, stderr: gpg: decryption failed: [Bb]ad key
; status:
; NEED_PASSPHRASE_SYM <cipheralgo> <s2kmode> <s2khash>
; DECRYPTION_FAILED
; symmetrically encrypted, good passphrase
; rc == 0, stdout: message
; status:
; NEED_PASSPHRASE_SYM <cipheralgo> <s2kmode> <s2khash>
; DECRYPTION_OKAY
; armored [A]:
; rc == 0, stdout: message
; no status
; corrupted armor
; rc == 2, stderr: gpg: CRC error; stuff - stuff
; ( to test: multiple recipients, keys without passphrases)
;; this parser's return convention:
;; '( (
;; replacep ; consumed by process-region: decrypt was successful
;;0 have-secret-key ; t: we are a recipient (TODO: stealth),
;; 'symmetric : need passphrase
;; 'signed : signed not encrypted
;; nil: not a recipient
;;1 passphrase-ok ; t was good, nil was bad, keyid: need pw for keyid
;;2 signature:
;; nil: no sig
;; keyid-hex : don't have signature key
;; '(keyid-string t trust date) : good signature on date with trust
;; '(keyid-string nil trust date) : bad signature on date with trust
;; )
;; )
; todo: stealth ("--throw-keyid")?
; when there is a signature that we can't check because of a bad algo
; then we pretend there wasn't a signature. extend the return convention
; to signal this case.
; when there is a signature that we can't check because we don't
; currently have a key, and if we successfully fetch that key in
; mc-gpg-decrypt-region, how do we restart the operation?
;; cases:
;; *not addressed to us (nil nil nil)
;; *just armored (same as good symmetric) ('symmetric t nil)
;; conventionally encrypted
;; *didn't give passphrase ('symmetric "***** CONVENTIONAL *****" nil)
;; did give passphrase
;; *bad passphrase ('symmetric nil nil)
;; *good passphrase ('symmetric t nil)
;; signed (not clearsigned), not encrypted
;; *don't have key ('signed t keyid)
;; do have key
;; *good sig ('signed t (t keyid-string trust date))
;; *bad sig ('signed t (nil keyid-string trust date))
;; encrypted to us:
;; *didn't give passphrase (t keyid nil)
;; gave passphrase:
;; *bad passphrase (t nil nil)
;; good passphrase
;; decrypted ok
;; *no signature (t t nil)
;; yes signature
;; *don't have key (offer to fetch) (t t keyid)
;; do have key
;; *good sig (t t (t keyid-string date trust))
;; *bad sig (t t (nil keyid-string date trust))
;; a subfunction to extract the signature info. Used in both decrypt-parser
;; and verify-parser. Call with statusbuf. Returns
;; '(sigtype sigid sigdate sigtrust)
(defun mc-gpg-sigstatus-parser ()
(let (sigtype sigid sigdate sigtrust)
;; sigtype: GOOD, BAD, ERR
;; sigid: who made the signature? (a name if possible, else hex keyid)
;; sigdate: date string of when the sig was made
(goto-char (point-min))
(if (re-search-forward "^\\[GNUPG:\\] +\\(GOOD\\|BAD\\|ERR\\)SIG\\b"
nil t)
(progn
(setq sigtype (match-string 1))
(goto-char (point-min))
(if (and (or (string= sigtype "GOOD") (string= sigtype "BAD"))
(re-search-forward
"^\\[GNUPG:\\] +\\(GOOD\\|BAD\\)SIG +\\(\\S +\\) +\\(.*\\)$" nil t))
;; match-string 2 is the hex keyid of the signator.
;; #3 is the name
(setq sigid (match-string 3)))
;; for ERRSIG:
;; match-string #1 is the hex keyid, #2 is the algorithm ID
;; (17: DSA, 1,3: RSA, 20: Elgamal)
;; #3: hashalgo, #4: sigclass, #5: longtime, #6: rc
;; (rc==4 for unknown algo, 9 for missing public key)
;; we only set sigtype if:
;; (#1 is present), and
;; ((#6 is missing) or (#6 == 9))
;; the idea being to not fetch a key if we aren't going to be able
;; to use the algorithm it wants
(goto-char (point-min))
(if (and (string= sigtype "ERR")
(re-search-forward
"^\\[GNUPG:\\] +ERRSIG +\\(\\S +\\)" nil t))
(let (errsig-rc (sigid-temp (match-string 1)))
(goto-char (point-min))
(if (re-search-forward
"^\\[GNUPG:\\] +ERRSIG +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\)" nil t)
(setq errsig-rc (match-string 6)))
(if (or
(not errsig-rc)
(string= errsig-rc "9"))
(setq sigid sigid-temp))
))
;; for GOODSIG:
;; VALIDSIG should be present, with <keyfingerprint> <date> <time>
(goto-char (point-min))
(if (and (string= sigtype "GOOD")
(re-search-forward
"^\\[GNUPG:\\] +SIG_ID +\\(\\S +\\) +\\(\\S +\\)\\b"
nil t))
(setq sigdate (match-string 2))
;; in gpg >= 0.9.7, a third field is a longtime value (seconds
;; since epoch)
)
;; sigtrust: how trusted is the signing key?
(goto-char (point-min))
(if (re-search-forward "^\\[GNUPG:\\] +\\(TRUST_\\S +\\)$" nil t)
(setq sigtrust (match-string 1)))
))
(list sigtype sigid sigdate sigtrust))
)
; this parser's job is to find the decrypted data if any is available. The
; code in -decrypt-region will worry about reporting other status information
; like signatures. PARSERDATA is non-nil if a passphrase was given to GPG.
(defun mc-gpg-decrypt-parser (stdoutbuf stderrbuf statusbuf rc parserdata)
(let
(
decryptstatus ; DECRYPTION_(OKAY|FAILED)
no-seckey ; NO_SECKEY
keyid ; NEED_PASSPHRASE <keyid>
missing-passphrase ; MISSING_PASSPHRASE
symmetric ; NEED_PASSPHRASE_SYM
badpass ; BAD_PASSPHRASE
sigtype ; GOODSIG, BADSIG, ERRSIG
sigid ;; GOODSIG <keyid> (note: not SIG_ID!),
;;; or ERRSIG <keyid> if ERRSIG-rc is 9 for missing pubkey
sigdate ; VALIDSIG .. <date>
sigtrust ; TRUST_(UNDEFINED|NEVER|MARGINAL|FULLY|ULTIMATE)
)
;; this code is split into two pieces. The first scans statusbuf
;; (and stderr if absolutely necessary) for keywords, setting the
;; local variables to describe what happened during our decryption attempt.
;; We don't try too hard to interpret the results yet.
;; the second part (the big cond statement below) interprets those vars
;; to decide what to report to the caller
(set-buffer statusbuf)
;; decryptstatus: no decryption took place, one was ok, or one failed
(goto-char (point-min))
(if (re-search-forward
"^\\[GNUPG:\\] +DECRYPTION_\\(OKAY\\|FAILED\\)\\b"
nil t)
(setq decryptstatus (match-string 1)))
;; no-seckey: set if we saw a NO_SECKEY message.
(goto-char (point-min))
(if (re-search-forward
"^\\[GNUPG:\\] +NO_SECKEY\\b"
nil t)
(setq no-seckey t))
;; keyid: the message is encrypted to one of our private keys and we
;; need a passphrase from the user. which one?
(goto-char (point-min))
(if (re-search-forward "^\\[GNUPG:\\] +NEED_PASSPHRASE +\\(\\S +\\)"
nil t)
(setq keyid (concat "0x" (match-string 1))))
;; missing-passphrase: set if we saw MISSING_PASSPHRASE
(goto-char (point-min))
(if (re-search-forward "^\\[GNUPG:\\] +MISSING_PASSPHRASE\\b"
nil t)
(setq missing-passphrase t))
;; symmetric: Set if the message is symmetrically encrypted.
(goto-char (point-min))
(if (re-search-forward
"^\\[GNUPG:\\] +NEED_PASSPHRASE_SYM\\b"
nil t)
(setq symmetric t))
;; badpass: GPG did not get a good passphrase. Either we didn't give one
;; or we gave the wrong one.
(goto-char (point-min))
(if (re-search-forward "^\\[GNUPG:\\] +BAD_PASSPHRASE\\b"
nil t)
(setq badpass t))
(let ((sigstuff (mc-gpg-sigstatus-parser)))
(setq sigtype (nth 0 sigstuff))
(setq sigid (nth 1 sigstuff))
(setq sigdate (nth 2 sigstuff))
(setq sigtrust (nth 3 sigstuff))
)
;; begin second piece: stare at those variables and decide what happened.
;; refer to the "cases:" comment above for what we look for.
(mc-gpg-debug-print
(format
"decrypt-parser: decryptstatus=%s no-seckey=%s keyid=%s missing-passphrase=%s symmetric=%s badpass=%s sigtype=%s sigid=%s sigdate=%s sigtrust=%s rc=%s"
decryptstatus no-seckey keyid missing-passphrase symmetric badpass sigtype sigid sigdate sigtrust rc))
(cond
((and (not decryptstatus) (not (or keyid symmetric)))
;; either corrupt, armored-only, signed-only
;; or we're using an old gpg and no passphrase was requested:
;; either corrupt, armored-only, signed-only, or not for us.
(cond
(sigtype
;; signed-only. extract info
(cond
((string= sigtype "GOOD") ;; good signature
(list t 'signed t (list t sigid sigtrust sigdate)))
((string= sigtype "BAD") ;; bad signature
(list t 'signed t (list nil sigid sigtrust sigdate)))
((string= sigtype "ERR") ;; couldn't check: why?
(if sigid
;; didn't have the key, we can fetch it
(list t 'signed t sigid)
;; can't use it. pretend it wasn't signed.
(list t t t nil)))
(t ;; sigtype is bogus
(error "sigtype was bogus. Shouldn't happen."))
))
((not (= rc 0)) ;; corrupt
(error "The message was corrupt."))
(t ;; armored-only
(list t 'symmetric t nil))
))
((or
(string= decryptstatus "FAILED")
;; couldn't decrypt: not to us, need pw, bad pw
(and (not decryptstatus)
(or keyid symmetric)
(not (= rc 0))
(not (string= sigtype "ERR")))
;; or old gpg and we could have decrypted it (a passphrase was
;; requested), but the decrypt went bad (rc!=0 but not due to ERRSIG)
)
(cond
((and (not symmetric) (not keyid))
;; didn't ask for a passphrase, ergo it isn't for us
(list nil nil nil nil))
((or missing-passphrase (not parserdata))
;; we didn't give a passphrase, need pubkey or symmetric
(if symmetric
(list nil 'symmetric "***** CONVENTIONAL *****" nil)
(list nil t keyid nil)))
(symmetric ;; symmetric fails without a BAD_PASSPHRASE
(list nil 'symmetric nil nil))
((or badpass parserdata)
;; probably pubkey, we gave the wrong passphrase
(list nil t nil nil))
(t ;; shouldn't happen, error out
(error "decryption failed, but I don't know why. Shouldn't happen."))
))
((or
(string= decryptstatus "OKAY")
;; decrypted okay, check for signature
(and (not decryptstatus)
keyid
(not (= rc 0))
(string= sigtype "ERR"))
;; or old gpg and sigcheck went bad (rc!=0 due to ERRSIG)
(and (not decryptstatus)
keyid
(= rc 0))
;; or old gpg, passphrase was requested, no errors reported
)
(cond
(sigtype ;; there was a signature, extract the info (never sym here)
(cond
((string= sigtype "GOOD") ;; good signature
(list t t t (list t sigid sigtrust sigdate)))
((string= sigtype "BAD") ;; bad signature
(list t t t (list nil sigid sigtrust sigdate)))
((string= sigtype "ERR") ;; couldn't check: why?
(if sigid
;; didn't have the key. we can fetch it.
(list t t t sigid)
;; no keyid, or we can't use it. pretend there wasn't a sig.
(list t t t nil)))
(t ;; sigtype is bogus
(error "sigtype was bogus. Shouldn't happen."))
))
(t ;; there wasn't a signature
(if symmetric
(list t 'symmetric t nil)
(list t t t nil)))
))
(t ;; decryptstatus was bogus. error out.
(error "decryptstatus was bogus '%s'. Shouldn't happen." decryptstatus))
)
))
;; message about who made the signature. This is a bit wide.. the date can
;; easily run off the echo area. Consider replacing 'Good signature' with
;; 'good sig', but keep it consistent with everything else. This function is
;; used by both the decrypt section and the verify section.
;; todo: should the keyid be put in here? If the user reads the trustvalue,
;; and if they have a trust path, then they can trust the name.
(defun mc-gpg-format-sigline (goodp sigid sigtrust sigdate)
(if goodp
(format "Good signature from '%s' %s made %s"
sigid sigtrust sigdate)
(format "BAD SIGNATURE claiming to be from '%s'" sigid)
))
;; decrypt-region is first called without ID. This means we'll try to decrypt
;; without a passphrase, almost guaranteed to fail, but it will tell us which
;; key is necessary. We then call decrypt-region again, this time with ID
;; set. This second time will lookup ID and ask the user for the passphrase.
(defun mc-gpg-decrypt-region (start end &optional id)
;; returns a pair (SUCCEEDED . VERIFIED) where SUCCEEDED is t if
;; the decryption succeeded and verified is t if there was a valid signature
(let ((process-environment process-environment)
(buffer (get-buffer-create mc-buffer-name))
(obuf (current-buffer))
args key new-key passwd result gpg-id)
(mc-gpg-debug-print (format "(mc-gpg-decrypt-region start=%s end=%s id=%s)"
start end id))
(undo-boundary)
(if id
;; second time through, now we know who the message is for.
;; id is either a hex keyid of the (first?) secret key that is in
;; the message's recipient list, or "**..CONVENTIONAL.."
(progn
(setq key (mc-gpg-lookup-key id 'encrypt))
;; key is nil if CONVENTIONAL, (string . hexid) otherwise
(setq passwd
(if key
(mc-activate-passwd (cdr key)
(format
"GPG passphrase for %s (%s): "
(car key) (cdr key)))
(mc-activate-passwd
id "GPG passphrase for conventional decryption: ")))
(if (string= passwd "")
(progn
(mc-deactivate-passwd t)
(error "Empty passphrases are bad, mmkay?")))
;; in particular, they cause an infinite loop. If the key doesn't
;; have a passphrase, the decryption should have worked the first
;; time around.
))
(setq args '("--batch"))
(if mc-gpg-alternate-keyring
(setq args (append args (list "--keyring" mc-gpg-alternate-keyring))))
(setq args (append args '("--decrypt"))) ; this wants to be last
(message "Decrypting...")
;; pass ID as the parserdata. This will be non-nil if a passphrase was
;; given (i.e. 2nd pass), which affects decrypt status parsing
(setq result
(mc-gpg-process-region
start end passwd mc-gpg-path args 'mc-gpg-decrypt-parser buffer id))
;(message "Decrypting... Done.")
;; result: '(HAVE-SECRET-KEY PASSPHRASE-OK SIG)
;; SIG: nil, sigkeyid, or '(KEYID GOODP TRUSTLEVEL DATESTRING)
(cond
((not (nth 0 result)) ;; we were not a recipient
(error "This message is not addressed to you"))
((not (nth 1 result)) ;; passphrase-ok is nil: bad passphrase
(mc-deactivate-passwd t)
(error "That passphrase was wrong"))
((not (equal (nth 1 result) t)) ;; passphrase-ok is keyid: need passphrase
;; get passphrase for (nth 1 result), try again
(mc-gpg-decrypt-region start end (nth 1 result))
)
;; passphrase was ok, were able to decrypt
((nth 2 result) ;; there was a signature
(let ((sig (nth 2 result)))
(cond
((atom sig) ;; don't have the signature key
(progn
;; offer to fetch the key, then what? run again? must we undo 1st?
(mc-message-sigstatus
(format "cannot check signature from keyid %s" sig))
(if (and (not (eq mc-gpg-always-fetch 'never))
(or mc-gpg-always-fetch
(y-or-n-p
(format "Key %s not found; attempt to fetch? " sig)))
(mc-gpg-fetch-key (cons nil sig)))
(progn
(undo-start)
(undo-more 1)
(mc-gpg-decrypt-region start end id))
'(t . nil))
))
((nth 0 sig) ;; good signature
(progn
(mc-message-sigstatus (mc-gpg-format-sigline
t (nth 1 sig) (nth 2 sig) (nth 3 sig)))
'(t . t)
))
(t ;; bad signature
(progn
(mc-message-sigstatus (mc-gpg-format-sigline
nil (nth 1 sig) (nth 2 sig) (nth 3 sig))
t ; get their attention
)
'(t . nil)
))
)))
(t ;; no signature
(message "Decrypting... Done.")
'(t . nil)
))
))
(defun mc-gpg-sign-region (start end &optional id unclear)
(let ((process-environment process-environment)
(buffer (get-buffer-create mc-buffer-name))
passwd args key result)
(setq key (mc-gpg-lookup-key (or id mc-gpg-user-id) 'sign))
(setq passwd
(mc-activate-passwd
(cdr key)
(format "GPG passphrase for %s (%s): " (car key) (cdr key))))
(setq args
(list
"--batch" "--armor"
"--local-user" (cdr key)
(if unclear "--sign" "--clearsign")
))
(if mc-gpg-comment
(setq args (append (list "--comment" (format "'%s'" mc-gpg-comment))
args)))
(if mc-gpg-extra-args
(setq args (append mc-gpg-extra-args args)))
(message "Signing as %s ..." (car key))
(setq result (mc-gpg-process-region start end passwd mc-gpg-path args
'mc-gpg-insert-parser buffer))
(if (car result)
(message "Signing as %s ... Done." (car key))
(progn
(mc-deactivate-passwd t)
(error "Signature failed: %s" (nth 2 result))
))
(car result)
))
; GPG VERIFY BEHAVIOR: gnupg-0.9.9 only
; (all status messages are prefixed by "[GNUPG:] "
; (filenames in [] are my parts of my testsuite)
; corrupted sig (armor is corrupt) [CS.s1bad]:
; rc == 2
; stderr: gpg: CRC error; stuff - stuff
; gpg: packet(1) with unknown version
; GOOD sig from a known key [CS.s1v,CS.s2v,CS.s3v]
; rc == 0
; status:
; SIG_ID <sigid> <date> <longtime>
; GOODSIG <longkeyid> <username>
; VALIDSIG <keyfingerprint> <date> <longtime>
; TRUST_(UNDEFINED|NEVER|MARGINAL|FULLY|ULTIMATE)
; BAD sig from a known key [CS.s1f]:
; rc == 1
; status: BADSIG <longkeyid> <username>
; unknown key [CS.s4]:
; rc == 2
; status:
; ERRSIG <longkeyid> <pubkeyalgo> <hashalgo> <sigclass> <longtime> <rc==9>
; NO_PUBKEY <longkeyid>
;; so no status messages mean armor corruption
;; return convention for mc-gpg-verify-parser:
;; (same as sig section of decrypt parser)
;; sigid : signed by an unknown key, need this key to verify
;; '(t sigid sigtrust sigdate): good sig from sigid
;; '(nil sigid sigtrust sigdate): forged sig "from" sigid
;; (actual return includes a leading nil because the verify-parser should
;; never replace the region with stdout)
(defun mc-gpg-verify-parser (stdoutbuf stderrbuf statusbuf rc parserdata)
(let (sigtype sigid sigdate sigtrust)
;; parse FOOSIG with the same code as decrypt-parser
(set-buffer statusbuf)
(let ((sigstuff (mc-gpg-sigstatus-parser)))
(setq sigtype (nth 0 sigstuff))
(setq sigid (nth 1 sigstuff))
(setq sigdate (nth 2 sigstuff))
(setq sigtrust (nth 3 sigstuff))
)
(mc-gpg-debug-print
(format
"decrypt-parser: sigtype=%s sigid=%s sigdate=%s sigtrust=%s"
sigtype sigid sigdate sigtrust))
(if (and (not (= rc 0))
(not sigtype))
(error "The message was corrupt."))
(cond
((string= sigtype "ERR")
(list nil sigid))
((string= sigtype "GOOD")
(list nil (list t sigid sigtrust sigdate))) ;; good sig
(t
(list nil (list nil sigid sigtrust sigdate))))
))
; check a signature, print a message about its validity. Returns t if the
; sig was valid, nil otherwise
(defun mc-gpg-verify-region (start end &optional no-fetch)
(let ((buffer (get-buffer-create mc-buffer-name))
(obuf (current-buffer))
args result)
(setq args '("--batch" "--verify"))
(if mc-gpg-alternate-keyring
(setq args (append "--keyring" mc-gpg-alternate-keyring args)))
(message "Verifying...")
(setq result (mc-gpg-process-region
start end nil mc-gpg-path args 'mc-gpg-verify-parser buffer))
(mc-gpg-debug-print (format "process-region returned %s" result))
(setq result (car result))
(cond
((atom result)
;; need key
(if (and
(not no-fetch)
(not (eq mc-gpg-always-fetch 'never))
(or mc-gpg-always-fetch
(y-or-n-p
(format "Key %s not found; attempt to fetch? " result)))
(mc-gpg-fetch-key (cons nil result))
(set-buffer obuf))
(mc-gpg-verify-region start end t)
(error "Can't check signature: Public key %s not found" result)))
((nth 0 result)
;; good sig
(progn
(message (mc-gpg-format-sigline
t (nth 1 result) (nth 2 result) (nth 3 result)))
t))
(t
;; bad sig
(progn
(ding)
(message (mc-gpg-format-sigline
nil (nth 1 result) (nth 2 result) (nth 3 result)))
nil))
)
))
(defun mc-gpg-insert-public-key (&optional id)
(let ((buffer (get-buffer-create mc-buffer-name))
args result)
(setq id (or id mc-gpg-user-id))
(setq args (list "--export" "--armor" "--batch" (concat "\"" id "\"")))
(if mc-gpg-comment
(setq args (append (list "--comment" (format "'%s'" mc-gpg-comment))
args)))
(if mc-gpg-alternate-keyring
(setq args (append (list "--keyring" mc-gpg-alternate-keyring) args)))
(setq result (mc-gpg-process-region (point) (point) nil mc-gpg-path
args 'mc-gpg-insert-parser buffer))
(if (car result)
(message (format "Key for user ID: %s" id))
(message "failed: %s" (nth 2 result)))
(car result)
))
;; GPG IMPORT BEHAVIOR: gnupg-0.9.9 only
;; status:
;; IMPORT_RES (12 fields)
;; 1 <count> : number of keys seen
;; 2 <no_user_id> : the number of keys without valid userids, including
;; keys that weren't self-signed
;; 3 <imported> : new public keys
;; 4 <imported_rsa> : new RSA public keys (included in <imported>)
;; 5 <unchanged> : old public keys
;; 6 <n_uids>
;; 7 <n_subk>
;; 8 <n_sigs>
;; 9 <n_revoc>
;; 10 <sec_read> : number of secret keys seen
;; 11 <sec_imported> : new secret keys
;; 12 <sec_dups> : old secret keys
;; the first three are for public keys, the last three are for secret keys.
;; add them together, I guess. It's unlikely that anyone will be importing
;; armored secret keys via email, but if they do it will be reported as if
;; it were a public key.
;; return convention:
;; error with stderr if rc != 0
;; '(count bad new old changed secretp)
(defun mc-gpg-snarf-parser (stdoutbuf stderrbuf statusbuf rc parserdata)
(if (eq rc 0)
(let (count bad new old changed secretp)
(set-buffer statusbuf)
(goto-char (point-min))
(if (re-search-forward
"^\\[GNUPG:\\] +IMPORT_RES +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\) +\\(\\S +\\)"
nil t)
(progn
(setq count (string-to-number (match-string 1)))
(setq bad (string-to-number (match-string 2)))
(setq new (+ (string-to-number (match-string 3))
(string-to-number (match-string 11))))
(setq old (+ (string-to-number (match-string 5))
(string-to-number (match-string 12))))
(setq changed (- count bad new old))
(setq secretp (not (string= (match-string 10) "0")))
(list nil count bad new old changed secretp))
(error "No key import status: your GnuPG is too old."))
)
(error (with-current-buffer stderrbuf (buffer-string))))
)
(defun mc-gpg-snarf-keys (start end)
;; Returns number of keys found.
(let ((buffer (get-buffer-create mc-buffer-name))
results args msg)
(setq args '("--import" "--batch"))
(if mc-gpg-alternate-keyring
(setq args (append args (list "--keyring" mc-gpg-alternate-keyring))))
(message "Snarfing...")
(setq results (mc-gpg-process-region start end nil mc-gpg-path args
'mc-gpg-snarf-parser buffer))
;; don't have to update trustdb: gpg does it automatically (although it
;; might take a few seconds if a lot of keys or signatures have been
;; added).
;; Is there any point to displaying this message? mc-snarf-keys will
;; display a simple "%d new keys found" message right after we return.
;; Well, print it anyway, if the user looks in the *Messages* buffer
;; they'll see more.
(setq msg (format "%d keys seen" (nth 0 results)))
(if (not (zerop (nth 1 results)))
(setq msg (concat msg (format ", %d bad" (nth 1 results)))))
(if (not (zerop (nth 2 results)))
(setq msg (concat msg (format ", %d new" (nth 2 results)))))
(if (not (zerop (nth 3 results)))
(setq msg (concat msg (format ", %d old" (nth 3 results)))))
(if (not (zerop (nth 4 results)))
(setq msg (concat msg (format ", %d changed" (nth 4 results)))))
(if (nth 5 results)
(setq msg (concat msg ", SECRET KEYS IMPORTED")))
(message msg)
(nth 2 results)
))
(defun mc-scheme-gpg ()
(list
(cons 'encryption-func 'mc-gpg-encrypt-region)
(cons 'decryption-func 'mc-gpg-decrypt-region)
(cons 'signing-func 'mc-gpg-sign-region)
(cons 'verification-func 'mc-gpg-verify-region)
(cons 'key-insertion-func 'mc-gpg-insert-public-key)
(cons 'snarf-func 'mc-gpg-snarf-keys)
(cons 'key-fetch-func 'mc-gpg-fetch-key)
(cons 'msg-begin-line mc-gpg-msg-begin-line)
(cons 'msg-end-line mc-gpg-msg-end-line)
(cons 'signed-begin-line mc-gpg-signed-begin-line)
(cons 'signed-end-line mc-gpg-signed-end-line)
(cons 'key-begin-line mc-gpg-key-begin-line)
(cons 'key-end-line mc-gpg-key-end-line)
(cons 'user-id mc-gpg-user-id)))
;;{{{ Key fetching
(defvar mc-gpg-always-fetch 'never
"*If t, always attempt to fetch missing keys, or never fetch if
'never.")
(defvar mc-gpg-keyserver 'nil
"*Keyserver to query for missing keys. If nil let GPG use its default.")
(defvar mc-gpg-finger-timeout 20
"*Timeout for a finger try in seconds.")
(defun mc-gpg-fetch-key-parser (stdoutbuf stderrbuf statusbuf rc parserdata)
(let (result tmp)
(save-excursion
(set-buffer statusbuf)
(goto-char (point-min))
(mc-gpg-debug-print
(format "(mc-gpg-fetch-key-parser (stdoutbuf=%s stderrbuf=%s statusbuf=%s rc=%s" stdoutbuf stderrbuf statusbuf rc))
(if (not (search-forward "[GNUPG:] IMPORT_RES" nil t))
;; no keys imported
(with-current-buffer stderrbuf
(setq result (list nil (buffer-string) nil)))
;; return the names and ids of imported keys
(goto-char (point-min))
(while (re-search-forward
"^\\[GNUPG:\\] +IMPORTED [A-F0-9]* " nil t)
(end-of-line)
(setq tmp (concat tmp
(buffer-substring (match-end 0) (point))
" ")))
(if (not tmp)
(setq tmp "was already in keyring"))
(setq result (list nil t tmp)))
)))
;;;###autoload
(defun mc-gpg-fetch-key (&optional id)
"Fetch a key using the gpg --recv-key method. With this method it is
only possible to look for key ids!"
(interactive)
(if (null id)
(setq id (read-string "Key-ID: ")))
(let ((buffer (get-buffer-create mc-buffer-name))
args result)
(setq args (list "--recv-keys" id))
(if mc-gpg-keyserver
(setq args (append (list "--keyserver" mc-gpg-keyserver args))))
(setq result (mc-gpg-process-region 1 1 nil mc-gpg-path args
'mc-gpg-fetch-key-parser buffer))
(if (equal (car result) t)
(message "Imported key %s: %s" id (cdr result))
(error (car result)))
))
;;;###autoload
(defun mc-gpg-fetch-from-finger (id)
"Fetch a key from a finger server. This function takes one argument of the
form USER@HOST."
(interactive "sFetch Key: ")
(let (buf connection user host)
(unwind-protect
(and (string-match "^\\(.+\\)@\\([^@]+\\)$" id)
(progn
(message "Trying to finger %s..." id)
(setq user (substring id
(match-beginning 1) (match-end 1)))
(setq host (substring id
(match-beginning 2) (match-end 2)))
(setq buf (generate-new-buffer " *mailcrypt temp*"))
(condition-case nil
(progn
(setq connection
(open-network-stream "*key fetch*" buf host 79))
(process-send-string connection
(concat "/W " user "\r\n"))
(while
(and (eq 'open (process-status connection))
(accept-process-output connection
mc-gpg-finger-timeout)))
(with-current-buffer buf
(mc-gpg-snarf-keys (point-min) (point-max))))
(error nil)))
(if buf (kill-buffer buf))
(if connection (delete-process connection))))))
;;}}}
|