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|
; mc-pgp.el, PGP support for Mailcrypt
;; Copyright (C) 1998 Len Budney <lbudney@pobox.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)
(require 'expect)
(defvar mc-pgp50-user-id (user-login-name)
"*PGP ID of your default identity.")
(defvar mc-pgp50-pgpe-path "pgpe" "*The PGP 5.0 'pgpe' executable.")
(defvar mc-pgp50-pgps-path "pgps" "*The PGP 5.0 'pgps' executable.")
(defvar mc-pgp50-pgpv-path "pgpv" "*The PGP 5.0 'pgpv' executable.")
(defvar mc-pgp50-pgpk-path "pgpk" "*The PGP 5.0 'pgpk' executable.")
(defvar mc-pgp50-display-snarf-output nil
"*If t, pop up the PGP output window when snarfing keys.")
(defvar mc-pgp50-alternate-keyring nil
"*Public keyring to use instead of default.")
(defvar mc-pgp50-comment
(format "Processed by Mailcrypt %s, an Emacs/PGP interface" mc-version)
"*Comment field to appear in ASCII armor output. If nil, let PGP
use its default.")
(defconst mc-pgp50-msg-begin-line "-----BEGIN PGP MESSAGE-----"
"Text for start of PGP message delimiter.")
(defconst mc-pgp50-msg-end-line "-----END PGP MESSAGE-----\n?"
"Text for end of PGP message delimiter.")
(defconst mc-pgp50-signed-begin-line "-----BEGIN PGP SIGNED MESSAGE-----"
"Text for start of PGP signed messages.")
(defconst mc-pgp50-signed-end-line "-----END PGP SIGNATURE-----"
"Text for end of PGP signed messages.")
(defconst mc-pgp50-key-begin-line "^-----BEGIN PGP PUBLIC KEY BLOCK-----\r?$"
"Text for start of PGP public key.")
(defconst mc-pgp50-key-end-line "^-----END PGP PUBLIC KEY BLOCK-----\r?$"
"Text for end of PGP public key.")
(defconst mc-pgp50-error-re "^\\(ERROR:\\|WARNING:\\).*"
"Regular expression matching an error from PGP")
(defconst mc-pgp50-sigok-re "^.*Good signature.*"
"Regular expression matching a PGP signature validation message")
(defconst mc-pgp50-badsig-re "^BAD signature.*"
"Regular expression matching a PGP signature validation message")
(defconst mc-pgp50-newkey-re "^\\([0-9]+\\) +matching keys? found"
"Regular expression matching a PGP key snarf message")
(defconst mc-pgp50-nokey-re
"No encryption keys found for: \\(.+\\)$"
"Regular expression matching a PGP missing-key messsage")
(defconst mc-pgp50-key-expected-re
"Signature by unknown keyid: \\(.+\\)$")
(defvar mc-pgp50-key-cache nil
"Association list mapping PGP IDs to canonical \"keys\". A \"key\"
is a pair (USER-ID . KEY-ID) which identifies the canonical IDs of the
PGP ID.")
;; Thanks to Brian Warner.
(defun mc-pgp50-lookup-key (str)
;; Look up the string STR in the user's key ring, expecting to find
;; a private key. Returns a pair of strings (USER-ID . KEY-ID)
;; which uniquely identifies the matching key, or nil if no key
;; matches. Example:
;; warner@foo -> ("Brian Warner <warner@foo.lothar.com>" "0x12345678")
(if (equal str "***** CONVENTIONAL *****") nil
(let ((result (cdr-safe (assoc str mc-pgp50-key-cache)))
(keyid-re "^sec\\S *\\s +\\w+\\s +\\(\\w+\\)\\s +")
(userid-re "^uid\\s +\\(.*\\)$")
(revoke-re "REVOKED")
(obuf (current-buffer))
buffer)
(if (null result)
(unwind-protect
(progn
(setq buffer (generate-new-buffer " *mailcrypt temp"))
(call-process mc-pgp50-pgpk-path nil buffer nil
"+language=en" "-l" str)
(set-buffer buffer)
(goto-char (point-min))
(while
(and (null result)
;; first find a keyid line for a secret key
(re-search-forward keyid-re nil t))
;; groovy. Remember the keyid and then search
;; forward for the userid
(progn
(setq keyid (buffer-substring-no-properties
(match-beginning 1) (match-end 1)))
(setq key-start (match-beginning 1))
(if (re-search-forward userid-re nil t)
(progn
(save-restriction
(setq result
(cons (buffer-substring-no-properties
(match-beginning 1)
(match-end 1))
keyid))
(setq key-end (match-end 1))
(narrow-to-region key-start key-end)
(goto-char (point-min))
(if (re-search-forward revoke-re nil t)
(setq result nil)
(setq mc-pgp50-key-cache
(cons (cons str result)
mc-pgp50-key-cache)))
))))))
(if buffer (kill-buffer buffer))
(set-buffer obuf)))
(if (null result) nil ) ; We don't mind a missing "secring"
result)))
;; Thanks to Brian Warner
(defun mc-pgp50-generic-parser (proc oldbuf start end newbuf passwd)
(let (start)
(process-send-region proc beg end)
(set-buffer newbuf)
(process-send-eof proc)
(while (eq 'run (process-status proc))
(accept-process-output proc 5))
(goto-char (point-min))
(setq result (process-exit-status proc))
(cond ((not (eq result 0))
(prog1
nil
(if (mc-message
"^Need a pass phrase to decrypt private key:$"
(current-buffer))
(mc-deactivate-passwd t)
(mc-message mc-pgp50-error-re (current-buffer)
(format "PGP exited with status %d" result)))))
((re-search-forward mc-pgp50-nokey-re nil t)
nil)
(t
(and
(goto-char (point-min))
(re-search-forward "-----BEGIN PGP.*-----$" nil t)
(setq start (match-beginning 0))
(goto-char (point-max))
(re-search-backward "^-----END PGP.*-----\n" nil t)
(setq end (match-end 0))
(set-buffer obuf)
(list t (cons start end)))))))
(defun mc-pgp50-process-region
(beg end passwd program args parser &optional buffer)
(let ((obuf (current-buffer))
(process-connection-type nil)
(shell-file-name "/bin/sh")
mybuf result rgn proc results)
(unwind-protect
(progn
(setq mybuf (or buffer (generate-new-buffer " *mailcrypt temp")))
(set-buffer mybuf)
(erase-buffer)
(set-buffer obuf)
(buffer-disable-undo mybuf)
(setq proc
(apply 'start-process-shell-command "*PGP*" mybuf program
"2>&1" args))
(if passwd
(or mc-passwd-timeout (mc-deactivate-passwd t)))
;; Now hand the process to the parser, which returns the exit
;; status of the dead process and the limits of the region
;; containing the PGP results.
(setq results (funcall parser proc obuf beg end mybuf passwd))
(setq result (car results))
(setq rgn (cadr results))
;; Hack to force a status_notify() in Emacs 19.29
(set-buffer mybuf)
;; Hurm. FIXME; must get better result codes.
(if (stringp result)
(message result))
;; If the parser found something, migrate it to the old
;; buffer. In particular, the parser's job is to return
;; a cons of the form ( beg . end ) delimited the result
;; of PGP in the new buffer.
(if (consp rgn)
(progn
(set-buffer obuf)
(delete-region beg end)
(goto-char beg)
(insert-buffer-substring mybuf (car rgn) (cdr rgn))
(set-buffer mybuf)
(delete-region (car rgn) (cdr rgn))))
;; Return nil on failure and exit code on success
(if rgn result nil))
;; Cleanup even on nonlocal exit
(if (and proc (eq 'run (process-status proc)))
(interrupt-process proc))
(set-buffer obuf)
(or buffer (null mybuf) (kill-buffer mybuf))
rgn)))
;;; }
(defun mc-pgp50-encrypt-parser (proc oldbuf start end newbuf passwd)
(set-buffer newbuf)
(goto-char (point-max))
(setq results nil)
(progn
(unwind-protect
(with-expect proc
(message "Encrypting message...")
(set-buffer oldbuf)
(if passwd
(progn
(process-send-string proc (concat passwd "\n"))
(or mc-passwd-timeout (mc-deactivate-passwd t))))
(process-send-region proc start end)
(set-buffer newbuf)
(process-send-eof proc)
;; Test output of the program, looking for
;; errors.
(expect-cond
;; OPTION 1: Great! The data is now encrypted!
("-----END PGP MESSAGE-----"
;; Catch the exit status.
(setq result (process-exit-status proc))
(delete-process proc)
(message "Encryption complete.")
;; Delete everything preceding the signed data.
(goto-char (point-max))
(re-search-backward
"-----BEGIN PGP MESSAGE-----" nil t)
(delete-region (point-min) (match-beginning 0))
(setq rgn (point-min))
;; Convert out CR/NL -> NL
(goto-char (point-min))
(while (search-forward "\r\n" nil t)
(replace-match "\n"))
;; Delete everything after the signature.
(goto-char (point-min))
(re-search-forward
"-----END PGP MESSAGE-----\n" nil t)
(delete-region (match-end 0) (point-max))
;; Return the exit status, with the region
;; limits!
(setq rgn (cons rgn (point-max)))
(setq results (list result rgn)))
;; OPTION 2: The passphrase is no good.
("Enter pass phrase:"
(interrupt-process proc)
(delete-process proc)
(mc-deactivate-passwd t)
(setq results '("Incorrect passphrase." nil)))
;; OPTION 3: There are keys missing. Just bug out
;; of the whole thing, for now.
("\nNo encryption keys found for:"
(interrupt-process proc)
(delete-process proc)
(setq results '("One or more public keys are missing" nil)))
;; OPTION 3a: There are bad keys in the keyring. This is
;; an odd variant of 3, for example when using a key from
;; the "Cyber-Knights Termplar," which generates 8K keys.
("\nNo valid keys found"
(interrupt-process proc)
(delete-process proc)
(setq results '("One or more public keys are missing" nil)))
;; OPTION 4: No recipients specified.
("You must specify at least one recipient"
(interrupt-process proc)
(delete-process proc)
(mc-deactivate-passwd t)
(setq results '("No recipients specified" nil)))
;; OPTION 5: The program exits.
(exit
(setq results (list
(process-exit-status proc) nil)))))
(set-buffer obuf))
results))
(defun mc-pgp50-encrypt-region (recipients start end &optional id sign)
(let ((process-environment process-environment)
(buffer (get-buffer-create mc-buffer-name))
;; Crock. Rewrite someday.
(mc-pgp-always-sign mc-pgp-always-sign)
(obuf (current-buffer))
action msg args key passwd result pgp-id)
(setq args (list "+NoBatchInvalidKeys=off" "-fat" "+batchmode=1"))
(setq action (if recipients "Encrypting" "Armoring"))
(setq msg (format "%s..." action)) ; May get overridden below
(if mc-pgp50-comment
(setq args (cons (format "+comment=\"%s\"" mc-pgp50-comment) args)))
(if mc-pgp50-alternate-keyring
(setq args (append args (list (format "+pubring=%s"
mc-pgp50-alternate-keyring)))))
(if
(and (not (eq mc-pgp-always-sign 'never))
(or
mc-pgp-always-sign
sign
(y-or-n-p "Sign the message? ")))
(progn
(setq mc-pgp-always-sign t)
(setq key (mc-pgp50-lookup-key (or id mc-pgp50-user-id)))
(if (not key) (error "No key available for signing."))
(setq passwd
(mc-activate-passwd
(cdr key)
(format "PGP passphrase for %s (%s): " (car key) (cdr key))))
(setq args
(nconc args (list "-s" "-u" (cdr key))))
(setenv "PGPPASSFD" "0")
(setq msg (format "%s+signing as %s ..." action (car key))))
(setq mc-pgp-always-sign 'never))
(or key
(setq key (mc-pgp50-lookup-key mc-pgp50-user-id)))
(if (and recipients mc-encrypt-for-me key)
(setq recipients (cons (cdr key) recipients)))
(if recipients
(setq args (append args
(apply 'append (mapcar
'(lambda (x) (list "-r" (concat "\"" x "\"")))
recipients)))))
(message "pgpe %s" (mapconcat 'identity args " "))
(message "%s" msg)
(setq result (mc-pgp50-process-region
start end passwd mc-pgp50-pgpe-path args
'mc-pgp50-encrypt-parser buffer))
(save-excursion
(set-buffer buffer)
(goto-char (point-min))
(if (re-search-forward mc-pgp50-nokey-re nil t)
(progn
(if result (error "This should never happen."))
(setq pgp-id (buffer-substring-no-properties
(match-beginning 1) (match-end 1)))
(if (and (not (eq mc-pgp50-always-fetch 'never))
(or mc-pgp50-always-fetch
(y-or-n-p
(format "Key for '%s' not found; try to fetch? "
pgp-id))))
(progn
(mc-pgp50-fetch-key (cons pgp-id nil))
(set-buffer obuf)
(mc-pgp50-encrypt-region recipients start end id))
(mc-message mc-pgp50-nokey-re buffer)
nil))
(if (not result)
nil
(message "%s Done." msg)
t)))))
(defun mc-pgp50-decrypt-parser (proc oldbuf start end newbuf passwd)
(setenv "PGPPASSFD" "0")
(set-buffer newbuf)
(goto-char (point-max))
(progn
(unwind-protect
(with-expect proc
(message "Sending passphrase...")
(expect-send (concat passwd "\n"))
(expect "No files specified. Using stdin."
(message "Passphrase sent. Decrypting...")
(set-buffer oldbuf)
(process-send-region proc start end)
(set-buffer newbuf)
(process-send-eof proc)
;; Test output of the program, looking for
;; errors.
(expect-cond
;; OPTION 1: Here comes the message!
("Opening file \"stdout\" type .*\.\n"
;; Record this point!
(setq rgn (point))
(message "Decryption complete.")
;; Now wait out the process.
(while (eq 'run (process-status proc))
(accept-process-output proc 5))
(setq result (process-exit-status proc))
(delete-process proc)
;; Check whether there was a good signature made.
(goto-char (point-max))
(if
(re-search-backward
(concat
"\\(Good signature made.*by\\).*\n.*\n"
"\[ \t\]*\\(.*\\)\n")
nil t)
(progn
(setq rgn (cons rgn (match-beginning 1)))
(setq result
(concat
(buffer-substring-no-properties
(match-beginning 1)
(match-end 1))
" "
(buffer-substring-no-properties
(match-beginning 2)
(match-end 2)))))
;; Note that we don't check for a BAD signature. The
;; effect is that the "BAD signature" message is
;; embedded in the message itself. Is it impolite to
;; stick stuff into people's messages? Well, forgery
;; is impolite, too!
(setq rgn (cons rgn (point-max))))
;; Return the exit status, with the region
;; limits!
(setq results (list result rgn)))
;; OPTION 2: Awww...bad passphrase!
("Enter pass phrase:"
(mc-deactivate-passwd t)
(interrupt-process proc)
(delete-process proc)
;; Return the bad news.
(setq results
'("Incorrect passphrase or wrong key" nil)))
;; OPTION 3: Not encrypted to us!
("Cannot decrypt message. It can only be decrypted by:"
(interrupt-process proc)
(delete-process proc)
;; Return the bad news.
(setq results '("Message corrupt or not encrypted to you" nil)))
;; OPTION 4: The program exits.
(exit
(setq results (list
(process-exit-status proc) nil))))))
(pop-to-buffer obuf))
results))
(defun mc-pgp50-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))
args key new-key passwd result pgp-id)
(undo-boundary)
(setq key (mc-pgp50-lookup-key (or id mc-pgp50-user-id)))
(if (not key) (error "No key available for decrypting."))
(setq passwd
(if key
(mc-activate-passwd (cdr key)
(format "PGP passphrase for %s (%s): "
(car key) (cdr key)))
(mc-activate-passwd id "PGP passphrase for conventional decryption: ")))
(if passwd
(setenv "PGPPASSFD" "0"))
(setq args '("+verbose=1" "+batchmode" "+language=en" "-f"))
(if mc-pgp50-alternate-keyring
(setq args (append args (list (format "+pubring=%s"
mc-pgp50-alternate-keyring)))))
(message "pgpv %s" (mapconcat 'identity args " "))
(message "Decrypting...")
(setq result
(mc-pgp50-process-region
start end passwd mc-pgp50-pgpv-path
args 'mc-pgp50-decrypt-parser buffer))
(cond
(result
;; If verification failed due to missing key, offer to fetch it.
;; This is unchanged from mailcrypt 3.4, and should still work.
;; Execution never reaches this point when using PGP 5.0, however.
(save-excursion
(set-buffer buffer)
(goto-char (point-min))
(if (re-search-forward mc-pgp50-key-expected-re nil t)
(setq pgp-id (concat "0x" (buffer-substring-no-properties
(match-beginning 1)
(match-end 1))))))
(if (and pgp-id
(not (eq mc-pgp50-always-fetch 'never))
(or mc-pgp50-always-fetch
(y-or-n-p
(format "Key %s not found; attempt to fetch? " pgp-id)))
(mc-pgp50-fetch-key (cons nil pgp-id)))
(progn
(undo-start)
(undo-more 1)
(mc-pgp50-decrypt-region start end id))
(mc-message mc-pgp50-key-expected-re buffer)
(cons t (eq result 0))))
;; Decryption failed; maybe we need to use a different user-id
((save-excursion
(and
(set-buffer buffer)
(goto-char (point-min))
(re-search-forward
"^Key for user ID:.*\n.*Key ID \\([0-9A-F]+\\)" nil t)
(setq new-key
(mc-pgp50-lookup-key
(concat "0x" (buffer-substring-no-properties
(match-beginning 1)
(match-end 1)))))
(not (and id (equal key new-key)))))
(mc-pgp50-decrypt-region start end (cdr new-key)))
;; Or maybe it is conventionally encrypted
((save-excursion
(and
(set-buffer buffer)
(goto-char (point-min))
(re-search-forward "^File is conventionally encrypted" nil t)))
(if (null key) (mc-deactivate-passwd t))
(mc-pgp50-decrypt-region start end "***** CONVENTIONAL *****"))
(t
(mc-display-buffer buffer)
(if (mc-message "^\aError: +Bad pass phrase\\.$" buffer)
(mc-deactivate-passwd t)
(mc-message mc-pgp50-error-re buffer "Error decrypting buffer"))
(cons nil nil)))))
(defun mc-pgp50-verify-parser (proc oldbuf start end newbuf passwd)
(setenv "PGPPASSFD") ; Delete this to exit batchmode!
(set-buffer newbuf)
(goto-char (point-max))
(progn
(unwind-protect
(with-expect proc
(expect "No files specified. Using stdin."
(set-buffer oldbuf)
(process-send-region proc start end)
(set-buffer newbuf)
(process-send-eof proc)
;; Test output of the program, looking for
;; errors.
(expect-cond
;; OPTION 1: Great! The signature is approved!
("Good signature made"
;; Let the program finish
(process-send-eof proc)
(while (eq 'run (process-status proc))
(accept-process-output proc 5))
;; Read the success message
(goto-char (point-max))
(re-search-backward
"\\(Good signature made.*by\\).*\n.*\n\[ \t\]*\\(.*\\)\n" nil t)
;; Return the good news!
(setq results
(list
(concat
(buffer-substring-no-properties
(match-beginning 1)
(match-end 1))
" "
(buffer-substring-no-properties
(match-beginning 2)
(match-end 2))) t)))
;; OPTION 2: Shucks! The signature is invalid!
("BAD signature made.*by key:\n"
;; Let the program finish
(process-send-eof proc)
(while (eq 'run (process-status proc))
(accept-process-output proc 5))
;; Read the warning message
(goto-char (point-max))
(re-search-backward
"\\(BAD signature made.*by\\).*\n.*\n\[ \t\]*\\(.*\\)\n" nil t)
;; Return the bad news
(setq results
(list
(concat
(buffer-substring-no-properties
(match-beginning 1)
(match-end 1))
" "
(buffer-substring-no-properties
(match-beginning 2)
(match-end 2))) t)))
;; OPTION 2a: We don't have the right public key!
("\n.*Signature by unknown keyid: 0x.*\n"
;; Catch the exit status.
(delete-process proc)
;; Return the good news!
(setq results
'("You don't have this person's public key!" nil)))
;; OPTION 2b: The message is not signed w/PGP 5.0
("\n.*Opening file ./dev/null. type .*\n"
;; Catch the exit status.
(delete-process proc)
;; Return the good news!
(setq results
'("Not a PGP 5.0 signed message!" nil)))
;; OPTION 3: Awww...This isn't clearsigned, it's encrypted!
("Enter pass phrase:"
(interrupt-process proc)
(delete-process proc)
;; Return the bad news.
(setq results '("Decrypt the message; that will verify it" nil)))
;; OPTION 4: The program exits.
(exit
(setq results (list
(process-exit-status proc) nil))))))
(pop-to-buffer obuf))
results))
(defun mc-pgp50-sign-parser (proc oldbuf start end newbuf passwd)
(setenv "PGPPASSFD" "0")
(set-buffer newbuf)
(goto-char (point-max))
(progn
(unwind-protect
(with-expect proc
(message "Sending passphrase...")
(expect-send (concat passwd "\n"))
(expect "No files specified. Using stdin."
(message "Passphrase sent. Signing...")
(set-buffer oldbuf)
(process-send-region proc start end)
(set-buffer newbuf)
(process-send-eof proc)
;; Test output of the program, looking for
;; errors.
(expect-cond
;; OPTION 1: Great! The data is now signed!
("-----END PGP SIGNATURE-----"
;; Catch the exit status.
(setq result (process-exit-status proc))
(delete-process proc)
(message "Signing complete.")
;; Delete everything preceding the signed data.
(goto-char (point-max))
(re-search-backward
"-----BEGIN PGP SIGNED MESSAGE-----" nil t)
(delete-region (point-min) (match-beginning 0))
(setq rgn (point-min))
;; Convert out CR/NL -> NL
(goto-char (point-min))
(while (search-forward "\r\n" nil t)
(replace-match "\n"))
;; Delete everything after the signature.
(goto-char (point-min))
(re-search-forward
"-----END PGP SIGNATURE-----\n" nil t)
(delete-region (match-end 0) (point-max))
;; Return the exit status, with the region
;; limits!
(setq rgn (cons rgn (point-max)))
(setq results (list result rgn)))
;; OPTION 1.a: The data is now signed, but is 8bit data.
("-----END PGP MESSAGE-----"
;; Catch the exit status.
(setq result (process-exit-status proc))
(delete-process proc)
(message "Signing complete.")
;; Delete everything preceding the signed data.
(goto-char (point-max))
(re-search-backward
"-----BEGIN PGP SIGNED MESSAGE-----" nil t)
(delete-region (point-min) (match-beginning 0))
(setq rgn (point-min))
;; Convert out CR/NL -> NL
(goto-char (point-min))
(while (search-forward "\r\n" nil t)
(replace-match "\n"))
;; Delete everything after the signature.
(goto-char (point-min))
(re-search-forward
"-----END PGP MESSAGE-----\n" nil t)
(delete-region (match-end 0) (point-max))
;; Return the exit status, with the region
;; limits!
(setq rgn (cons rgn (point-max)))
(setq results (list result rgn)))
;; OPTION 2: Awww...bad passphrase!
("Enter pass phrase:"
(mc-deactivate-passwd t)
(interrupt-process proc)
(delete-process proc)
;; Return the bad news.
(setq results '("Incorrect passphrase" nil)))
;; OPTION 3: The program exits.
(exit
(setq results (list
(process-exit-status proc) nil))))))
(pop-to-buffer obuf))
results))
(defun mc-pgp50-sign-region (start end &optional id unclear)
(let ((process-environment process-environment)
(buffer (get-buffer-create mc-buffer-name))
passwd args key)
(setq key (mc-pgp50-lookup-key (or id mc-pgp50-user-id)))
(if (not key) (error "No key available for signing."))
(setq passwd
(mc-activate-passwd
(cdr key)
(format "PGP passphrase for %s (%s): " (car key) (cdr key))))
(setenv "PGPPASSFD" "0")
(setq args
(list
"-fat" "+verbose=1" "+language=en"
(format "+clearsig=%s" (if unclear "off" "on"))
"+batchmode" "-u" (cdr key)))
(if mc-pgp50-comment
(setq args (cons (format "+comment=\"%s\"" mc-pgp50-comment) args)))
(message "pgps %s" (mapconcat 'identity args " "))
(message "Signing as %s ..." (car key))
(if (mc-pgp50-process-region start end passwd mc-pgp50-pgps-path args
'mc-pgp50-sign-parser)
(progn
(message "Signing as %s ... Done." (car key))
t)
nil)))
(defun mc-pgp50-verify-region (start end &optional no-fetch)
(let ((buffer (get-buffer-create mc-buffer-name))
(obuf (current-buffer))
args pgp-id)
(setq args '("+verbose=1" "+batchmode" "+language=en" "-f"))
(if mc-pgp50-alternate-keyring
(setq args (append args (list (format "+pubring=%s"
mc-pgp50-alternate-keyring)))))
(message "pgpv %s" (mapconcat 'identity args " "))
(message "Verifying...")
(if (mc-pgp50-process-region
start end nil mc-pgp50-pgpv-path args 'mc-pgp50-verify-parser buffer)
t
(save-excursion
(set-buffer buffer)
(goto-char (point-min))
(if (and
(not no-fetch)
(re-search-forward mc-pgp50-key-expected-re nil t)
(setq pgp-id
(concat "" (buffer-substring-no-properties
(match-beginning 1)
(match-end 1))))
(not (eq mc-pgp50-always-fetch 'never))
(or mc-pgp50-always-fetch
(y-or-n-p
(format "Key %s not found; attempt to fetch? " pgp-id)))
(mc-pgp50-fetch-key (cons nil pgp-id))
(set-buffer obuf))
(mc-pgp50-verify-region start end t)
(mc-message mc-pgp50-error-re buffer)
nil)))))
(defun mc-pgp50-insert-public-key (&optional id)
(let ((buffer (get-buffer-create mc-buffer-name))
args)
(setq id (or id mc-pgp50-user-id))
(setq args (list "+verbose=1" "+batchmode" "+language=en" "-x" id))
(if mc-pgp50-comment
(setq args (cons (format "+comment=\"%s\"" mc-pgp50-comment) args)))
(if (mc-pgp50-process-region (point) (point) nil mc-pgp50-pgpk-path
args 'mc-pgp50-generic-parser buffer)
(progn
(mc-message "Key for user ID: .*" buffer)
t))))
(defun mc-pgp50-snarf-parser (proc oldbuf start end newbuf passwd)
(let (result)
;; "pgpk +batchmode=1 -a file" is confused. Although it doesn't actually
;; read the key from stdin, sometimes it will just stare at you for several
;; seconds unless you type *something* into stdin. I've observed that it
;; absorbs about 680 bits of entropy from /dev/random too, so it might be
;; (pointlessly) generating some random data and thinks it should wait
;; for some keyboard input to mix into the random pool, but gives up after
;; a little while and gets on with the non-random business of importing a
;; key. Send an EOF to make it hurry up. Sometimes that helps.
(process-send-eof proc)
(while (eq 'run (process-status proc))
(accept-process-output proc 5))
(setq result (process-exit-status proc))
(list (eq result 0) t)))
(defun mc-pgp50-snarf-keys (start end)
;; Returns number of keys found.
(let ((buffer (get-buffer-create mc-buffer-name)) tmpstr args tempfile)
;; a known bug in pgp5.0: "pgpk -a" doesn't read from stdin like it should.
;; workaround: write key to a tempfile, then feed tempfile to pgpk -a
(setq tempfile
(make-temp-name (expand-file-name "mailcrypt-pgp50-snarffile-"
mc-temp-directory)))
(write-region start end tempfile)
(setq args (list "+verbose=1" "+batchmode=1" "+language=en" "-a" tempfile))
(if mc-pgp50-alternate-keyring
(setq args (append args (list (format "+pubring=%s"
mc-pgp50-alternate-keyring)))))
(message "Snarfing...")
(if (mc-pgp50-process-region start end nil mc-pgp50-pgpk-path args
'mc-pgp50-snarf-parser buffer)
(save-excursion
(delete-file tempfile)
;; look for "3 matching keys found" in the stderr. We don't actually
;; find out how many are new versus how many are old. Just pretend
;; they're all new.
(set-buffer buffer)
(goto-char (point-min))
(if (re-search-forward mc-pgp50-newkey-re nil t)
(progn
(if mc-pgp50-display-snarf-output (mc-display-buffer buffer))
(setq tmpstr (buffer-substring-no-properties
(match-beginning 1)
(match-end 1)))
(if (equal tmpstr "No")
0
(car (read-from-string tmpstr))))))
(delete-file tempfile)
(mc-display-buffer buffer)
(mc-message mc-pgp50-error-re buffer "Error snarfing PGP keys")
0)))
(defun mc-scheme-pgp50 ()
(list
(cons 'encryption-func 'mc-pgp50-encrypt-region)
(cons 'decryption-func 'mc-pgp50-decrypt-region)
(cons 'signing-func 'mc-pgp50-sign-region)
(cons 'verification-func 'mc-pgp50-verify-region)
(cons 'key-insertion-func 'mc-pgp50-insert-public-key)
(cons 'snarf-func 'mc-pgp50-snarf-keys)
(cons 'msg-begin-line mc-pgp50-msg-begin-line)
(cons 'msg-end-line mc-pgp50-msg-end-line)
(cons 'signed-begin-line mc-pgp50-signed-begin-line)
(cons 'signed-end-line mc-pgp50-signed-end-line)
(cons 'key-begin-line mc-pgp50-key-begin-line)
(cons 'key-end-line mc-pgp50-key-end-line)
(cons 'user-id mc-pgp50-user-id)))
;;{{{ Key fetching
(defvar mc-pgp50-always-fetch nil
"*If t, always attempt to fetch missing keys, or never fetch if
'never.")
(defvar mc-pgp50-keyserver-url-template
"/htbin/pks-extract-key.pl?op=get&search=%s"
"The URL to pass to the keyserver.")
(defvar mc-pgp50-keyserver-address "pgp.ai.mit.edu"
"Host name of keyserver.")
(defvar mc-pgp50-keyserver-port 80
"Port on which the keyserver's HTTP daemon lives.")
(defvar mc-pgp50-fetch-timeout 20
"*Timeout, in seconds, for any particular key fetch operation.")
(defvar mc-pgp50-fetch-keyring-list nil
"*List of strings which are filenames of public keyrings to search
when fetching keys.")
(defsubst mc-pgp50-buffer-get-key (buf)
"Return the first key block in BUF as a string, or nil if none found."
(save-excursion
(let (start)
(set-buffer buf)
(goto-char (point-min))
(and (re-search-forward mc-pgp50-key-begin-line nil t)
(setq start (match-beginning 0))
(re-search-forward mc-pgp50-key-end-line nil t)
(buffer-substring-no-properties start (match-end 0))))))
(defun mc-pgp50-fetch-from-keyrings (id)
(let ((keyring-list mc-pgp50-fetch-keyring-list)
buf proc key)
(unwind-protect
(progn
(message "Fetching %s from keyrings..." (or (cdr id) (car id)))
(while (and (not key) keyring-list)
(setq buf (generate-new-buffer " *mailcrypt temp*"))
(setq proc
(start-process "*PGP*" buf mc-pgp50-path "-kxaf"
"+verbose=0" "+batchmode"
(format "+pubring=%s" (car keyring-list))
(or (cdr id) (car id))))
;; Because PGPPASSFD might be set
(process-send-string proc "\r\n")
(while (eq 'run (process-status proc))
(accept-process-output proc 5))
(setq key (mc-pgp50-buffer-get-key buf))
(setq keyring-list (cdr keyring-list)))
key)
(if buf (kill-buffer buf))
(if (and proc (eq 'run (process-status proc)))
(interrupt-process proc)))))
(defun mc-pgp50-fetch-from-http (id)
(let (buf connection)
(unwind-protect
(progn
(message "Fetching %s via HTTP to %s..."
(or (cdr id) (car id)) mc-pgp50-keyserver-address)
(setq buf (generate-new-buffer " *mailcrypt temp*"))
(setq connection
(open-network-stream "*key fetch*" buf mc-pgp50-keyserver-address
mc-pgp50-keyserver-port))
(process-send-string
connection
(concat "GET " (format mc-pgp50-keyserver-url-template
(or (cdr id) (car id))) "\r\n"))
(while (and (eq 'open (process-status connection))
(accept-process-output connection mc-pgp50-fetch-timeout)))
(mc-pgp50-buffer-get-key buf))
(if buf (kill-buffer buf))
(if connection (delete-process connection)))))
(defun mc-pgp50-fetch-from-finger (id)
(let (buf connection user host)
(unwind-protect
(and (car id)
(string-match "^\\(.+\\)@\\([^@]+\\)$" (car id))
(progn
(message "Trying finger %s..." (car id))
(setq user (substring (car id)
(match-beginning 1) (match-end 1)))
(setq host (substring (car 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-pgp50-fetch-timeout)))
(mc-pgp50-buffer-get-key buf))
(error nil))))
(if buf (kill-buffer buf))
(if connection (delete-process connection)))))
(defvar mc-pgp50-fetch-methods '(mc-pgp50-fetch-from-keyrings
mc-pgp50-fetch-from-finger
mc-pgp50-fetch-from-http)
"List of methods to try when attempting to fetch a key. Each
element is a function to call with an ID as argument. See the
documentation for the function mc-pgp50-fetch-key for a description of
the ID.")
(defun mc-pgp50-fetch-key (&optional id)
"Attempt to fetch a key for addition to PGP keyring. Interactively,
prompt for string matching key to fetch.
Non-interactively, ID must be a pair. The CAR must be a bare Email
address and the CDR a keyID (with \"0x\" prefix). Either, but not
both, may be nil.
Return t if we think we were successful; nil otherwise. Note that nil
is not necessarily an error, since we may have merely fired off an Email
request for the key."
(interactive)
(let ((methods mc-pgp50-fetch-methods)
(process-connection-type nil) key proc buf args)
;; Temporarily disabled! Sorry.
(error "Key fetching not yet supported for PGP 5.0")
(if (null id)
(setq id (cons (read-string "Fetch key for: ") nil)))
(while (and (not key) methods)
(setq key (funcall (car methods) id))
(setq methods (cdr methods)))
(if (not (stringp key))
(progn
(message "Key not found.")
nil)
;; Maybe I'll do this right someday.
(unwind-protect
(save-window-excursion
(setq buf (generate-new-buffer " *PGP Key Info*"))
(pop-to-buffer buf)
(if (< (window-height) (/ (frame-height) 2))
(enlarge-window (- (/ (frame-height) 2)
(window-height))))
(setq args '("-f" "+verbose=0" "+batchmode"))
(if mc-pgp50-alternate-keyring
(setq args
(append args (list (format "+pubring=%s"
mc-pgp50-alternate-keyring)))))
(setq proc (apply 'start-process "*PGP*" buf mc-pgp50-path args))
;; Because PGPPASSFD might be set
(process-send-string proc "\r\n")
(process-send-string proc key)
(process-send-string proc "\r\n")
(process-send-eof proc)
(set-buffer buf)
(while (eq 'run (process-status proc))
(accept-process-output proc 5)
(goto-char (point-min)))
(if (y-or-n-p "Add this key to keyring? ")
(progn
(setq args (append args '("-ka")))
(setq proc
(apply 'start-process "*PGP*" buf mc-pgp50-path args))
;; Because PGPPASSFD might be set
(process-send-string proc "\r\n")
(process-send-string proc key)
(process-send-string proc "\r\n")
(process-send-eof proc)
(while (eq 'run (process-status proc))
(accept-process-output proc 5))
t)))
(if buf (kill-buffer buf))))))
;;}}}
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