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From exmh-users-admin@redhat.com Mon Sep 30 10:45:20 2002
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To: exmh-users@spamassassin.taint.org
Subject: exmh and pgp: support for external passphrase cache (+patch)
From: Alexander Zangerl <az@snafu.priv.at>
Cc: welch@panasas.com
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Date: Fri, 27 Sep 2002 14:42:27 +0200
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--Multipart_Fri_Sep_27_14:42:27_2002-1
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i'm a very happy user of exmh, but i'm paranoid also :-)
therefore i'm not too happy with exmh caching my pgp passphrases.
usually i use a relatively secure tool called 'quintuple agent'
<URL:http://www.vibe.at/tools/secret-agent/> to store my passphrases,
and i've just added the few lines of code to exmh which allow for such
external caches.
the patch is attached, it is against version 2.5-1 (debian), and the
files modified are extrasInit.tcl and pgpExec.tcl.
i've added three new preferences in the 'general pgp' section, which
allow everybody to use his/her favourite external tool to get the
passphrase (everything which spits out the phrase on stdout is ok).
i'd be happy if somebody with cvs access thinks that this stuff
is worth to be added and does so; apart from that i'm happy for
suggestions, comments or critique (mind you, i'm not exactly a special
friend of tcl so my code may leave things to be desired...)
regards
az
--Multipart_Fri_Sep_27_14:42:27_2002-1
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--- /usr/lib/exmh/extrasInit.tcl Sat Mar 2 17:26:38 2002
+++ ./extrasInit.tcl Fri Sep 27 14:22:13 2002
@@ -642,6 +642,18 @@
{pgp(passtimeout) pgpPassTimeout 60 {Minutes to cache PGP passphrase}
"Exmh will clear its memory of PGP passphrases after
this time period, in minutes, has elapsed." }
+{pgp(extpass) pgpExtPass OFF {Use external passphrase cache}
+"If this is enabled, then exmh will use an external program to retrieve
+your passphrase when needed. pgpKeepPass and pgpPassTimeout will
+be ignored."}
+{pgp(getextcmd) pgpGetExtCmd {/usr/bin/q-client get %s} {Method to query external passphrase cache}
+"This external program is used to retrieve the passphrase for your key,
+if pgpExtPass is active. The passphrase is expected on stdout.
+The key id is substituted with %s (using format)." }
+{pgp(delextcmd) pgpDelExtCmd {/usr/bin/q-client delete %s} {Method to invalidate external passphrase cache}
+"This external program is used to delete the passphrase for your key
+from the external cache, if pgpExtPass is active.
+The key id is substituted with %s (using format)." }
}
# Make sure we don't inherit a bad pgp(version) from a previous setup
--- /usr/lib/exmh/pgpExec.tcl Sat Mar 2 17:26:39 2002
+++ ./pgpExec.tcl Fri Sep 27 14:19:40 2002
@@ -647,6 +647,33 @@
proc Pgp_GetPass { v key } {
global pgp
+ if {[info exists pgp(extpass)] && [set pgp(extpass)] \
+ && [info exists pgp(getextcmd)]} {
+ Exmh_Debug "Pgp_GetPass $v $key external"
+ set keyid [lindex $key 0]
+ set cmd [format $pgp(getextcmd) $keyid]
+ while (1) {
+ Exmh_Debug "running cmd $cmd"
+ if [ catch {exec sh -c "$cmd"} result ] {
+ Exmh_Debug "error running cmd: $result"
+ Exmh_Status "Error executing external cmd" warn
+ return {}
+ } else {
+ if {[Pgp_Exec_CheckPassword $v $result $key]} {
+ return $result
+ } else {
+ Exmh_Debug "bad passphrase"
+ if {[info exists pgp(delextcmd)]} {
+ Exmh_Debug "trying to invalidate bad passphrase"
+ if [catch {exec sh -c "[format $pgp(delextcmd) $keyid]"}] {
+ Exmh_Debug "invalidation failed"
+ return {}
+ }
+ }
+ }
+ }
+ }
+ } else {
Exmh_Debug "Pgp_GetPass $v $key"
if {[lsearch -glob [set pgp($v,privatekeys)] "[lindex $key 0]*"] < 0} {
@@ -695,6 +722,7 @@
}
return $password
}
+ }
}
}
--Multipart_Fri_Sep_27_14:42:27_2002-1
Content-Type: text/plain; charset=US-ASCII
--
+ Alexander Zangerl + az@snafu.priv.at + DSA 42BD645D + (RSA 5B586291)
Kind of like my 404K fund, "wealth not found." -- shrox
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