This is the README for the PGP6 patch to ELM 2.4 PL24
Changes from version 5a to 6 may be found in the file HISTORY and in the
section '4) Changes' below.
Blurb
-----
Elm-PGP offers tightly coupled usage of PGP in Elm. You are able to
send PGP encrypted mails, check signatures and read encrypted mails
with minimal overhead. There is also a user interface (similar to
the aliases part of ELM) to comfortably manage the PGP keyrings.
Authors and contact addresses
-----------------------------
The PGP6 patch contains changes and extensions to ELM which come from
[email protected] (Robert Muchsel - Main PGP integration),
[email protected] (Chris Blum - Keyring management interface) and
[email protected] (Germano Caronni - Extensions and bugfixes).
Primary contact address for the PGP6 patch is
[email protected]
Send bugreports (better: patches), comments and suggestions to me,
I will forward them to the appropriate person.
Elm-PGP is originally based on a hack by Mic Shaw <
[email protected]>;
we triedto reach him, but this address doesn't seem to exist anymore.
This patch has been tested on Linux and Solaris, but it should work on
any reasonably Unix compatible platform.
FTP
---
You may get the newest version of Elm-PGP at
ftp://ftp.tik.ee.ethz.ch/~ftp/pub/packages/elm-pgp/
1. Features of Elm-PGP
----------------------
Our version of Elm-PGP has the following features:
a. PGP support is only active and visible if the following conditions are met:
- Environment variable PGPPATH points to the folder in which the key ring
or the pgp config-file reside (pubring.pgp OR config.txt OR .pgprc) OR
(if PGPPATH is not set) .pgp exists and contains one of above files AND
- User level is greater 0 AND
- Command line option -P is supplied OR ELMPGP environment variable is set
OR user presses '&' AND
- The PGP pass phrase is entered correctly OR the PGPPASS environment
variable is set.
This makes it possible to install Elm-PGP as the default Elm for all users.
b. Sending PGP messages is done automatically:
- If you have the public key of the recipient, the message will be signed
and encrypted.
- If you don't have the key, it will be signed.
- You can exclude recipients from encryption using the ~/.elm/pgpexclude
file (see below).
- If you want to send it plain (unsigned, un-encrypted), use the p)lain send
menu option.
- To send it just clearsigned use the si(g)n send menu option.
c. The pass phrase is not kept in the environment and not passed as a command
line parameter. The pipe mechanism of PGP is used.
d. Printing, piping, batch mode, etc. are supported.
2. Installation
---------------
a. Make sure PGP and Elm 2.4 PL24 (standard) work and you know how to use
them. If you haven't compiled any version of Elm yet, it's probably
safer to try the unpatched version first.
b. Apply the patches ('patch -p < elm.pl24-pgp6.diff') in the elm directory
itself. Some versions of patch need the '-p' argument to create new
files in the correct location, and not in the toplevel directory.
Apply later patches (e.g. elm.pgp6-pgp6a.diff) in chronological order.
c. Run Configure. There are three new questions regarding PGP support:
- Location of your pgp program (easy, eh?).
- Decide whether you want Elm-PGP to check the pass phrase once it is
entered (checking the pass phrase is recommended).
- The domain part of your users' mail addresses if it differs from the
host name. Example:
[email protected] needs to enter magic.net, because
the host name is something like 'ripoff122.magic.net'.
It is important to answer this question correctly, since Elm-PGP will
not be able to encrypt any mails to local recipients if this setting
is misconfigured (the domain name is needed to find the correct public
keys).
- If possible, don't install Elm-PGP setgid.
- Use an ANSI compliant C compiler. gcc works fine. Ensure the symbol
ANSI_C is defined (add -DANSI_C to the compiler flags, this removes
the -traditional default setting). If you don't, you are asking for
trouble (i.e. Elm works without -DANSI_C, but -DANSI_C is recommended).
- Look at the end of this section for some hints to compile Elm-PGP under
Linux and Solaris.
d. Make Elm-PGP ('make elm' or 'pmake elm') and run 'strip bin/*'.
e. Make a backup copy of standard Elm.
f. Move Elm-PGP to its proper place and set the permissions. This can
be done automatically by 'make install' or 'pmake install'.
g. Set PGPPATH and ELMPGP environment variables (preferably in .login or
.profile) if you want to use the PGP features.
setenv PGPPATH ~/.pgp
setenv ELMPGP YES <--- only if PGP support should be on by default
h. It is useful to add the following line to the .pgprc or config.txt
file:
MyName = "<Your user id>"
Elm-PGP tries to set all other options automatically. Section 5 lists
all styles of PGP invocations Elm-PGP does. For further information,
please check pgpdoc2.txt
i. Check whether you configured the mail domain correctly:
Run elm -P and enter the pass phrase. Now m)ail to your own user id.
If PGP-Elm can encrypt the mail ('Encrypting...') and it shows up
in the incoming folder with a 'P' status indicator and you can display
it properly, everything is OK. As a last check, press '%' and verify
that the address is correct.
j. Some Hints for Linux:
- If stdarg.h can not be found then make a symbolic link in /usr/include
to wherever this file is on your system. (use find).
- Does your /etc/passwd file keep full names in Berkeley/V7 format -> Y
- Compiler -> gcc
- Any additional cc flags? -> -DANSI_C (__NOT___ --traditional etc.)
- Use pmake -> Y
- To make: pmake, pmake install (make does not work if you have pmake)
- Some systems don't set the domain name correctly. Add a file called
'domain' to the Elm lib directory and put the domain name into this file.
k. Hints for Solaris:
- Do _NOT_ use the flock() locking style. (dot locking and fcntl is ok)
- Under some systems, -DANSI_C might help avoid troubles.
- Some systems don't set the domain name correctly. Add a file called
'domain' to the Elm lib directory and put the domain name into this file.
3. Using Elm-PGP
----------------
a. Start
If you have the ELMPGP environment variable set (or you use the -P command
line option), you will be asked for the PGP pass phrase. Pressing 'Enter'
without giving a pass phrase disables PGP support immediately. You can clear
and re-enter the pass phrase with the '&' key anytime.
b. Main menu
The second character in the message status column shows if there is PGP
information attached to a mail (if there are several PGP related parts
in the message, K takes precedence over P, P over S):
K -- Message contains public keys
P -- Message is encrypted ('PGP' or 'Private')
S -- Message is signed
If you press enter to display the message, it will be decrypted. If it
contains new keys, you will be asked whether you want to add them to your
key ring and whether you want to sign the new keys. Messages may be signed,
encrypted, etc. ad nauseam - Elm-PGP will recurse and should untangle
nested messages.
There are five new key assignments:
P -- Decrypt tagged messages and print them through the PGP filter (like
p, but with decryption)
S -- Decrypt tagged messages and save them (like s, but with decryption)
\ -- Decrypt tagged messages through the PGP filter and pipe them to a
command (like |, but with decryption)
& -- Disable/Enable PGP support and clear the pass phrase in memory.
y -- Enter the key management menu. In this menu you are able to examine
your keyrings and to change trust parameters and pass phrases, add
and remove signatures, keys and user IDs, and so forth.
c. Sending messages
When sending a message, it will be signed automatically. If the public keys
of all recipients are available, it will be encrypted. Otherwise you will be
asked if you want to send the message signed only. To send a plain unsigned
message, press p) for plain. To send a signed message only use si(g)n.
If you have the public keys of recipients who cannot handle encrypted mail
or who don't like encrypted mail, you can exclude them from encryption using
the pgpexclude file in the .elm directory. 'pgpexclude' is interpreted line
by line. Each line should contain one user id and nothing else. E.g.
# This is a comment
[email protected]
[email protected]
If Elm-PGP is unable to find the public key (e.g. because the mail address
and the address encoded within the key don't match), you can add a link
from the key to the mail address (cf. key management).
It is important to know that Elm-PGP selects the first matching user id in
your key ring. For example, if you have to different keys from the same person
(old and new key), Elm-PGP selects the first matching key based on the user
id.
You are able to enter PGP mode from the send menu by typing '&'. This is
useful if you have composed a message without first enabling the PGP mode.
If you are in send-only mode, the passphrase will not be checked. In this
case it might happen that after hitting s)end or si(g)n you are returned
to the send menu. In this case PGP failed to run successfully. Just toggle
'&' off and on, and try entring the passphrase again.
d. Key Menu
The key menu allows you to select among your keyrings, and to perform key
management operations on them. From here you can also send selected keys to
other users. The currently selected keyring is used for encryption etc. in
the other menus.
An important feature is the ability to link PGP keys to mail addresses. This
serves multiple goals:
- When sending mails to a mailing list of which you have the keys of all
recipients: Just tag the keys, press 'n' and enter the address of the
mailing list. All future mails to the list will then be encrypted with
all indicated keys (if PGP mode is enabled, of course).
- You send mails to
[email protected], but only have the key of
[email protected]. Select the key of 'gec', press 'n' and enter the address
[email protected]. The same is helpful if reply addresses do not
match user IDs, as provided in the keyring.
- If '
[email protected]' has lent his account to Bill Clinton, you
select the key of Bill Clinton and enter muchsels address. Thus mail to
this account will be encrypted with a completely independent key.
The Option e) of the key menu allows the manual modification of the key
link file (needed when deleting links or single key IDs from a link).
e. Security
Although Elm-PGP tries hard not to leave traces of your pass phrase
in memory and to delete all temporary decrypted files, it is important to
know that this is by no means a high security implementation. Elm itself,
the Elm-PGP modifications and PGP all use temporary files. If you are
running Elm-PGP on a personal account as the sole user, you could set the
temp directory to a private directory (Configure asks for the temp
directory).
Don't use this program if you have to keep vital secrets. Elm-PGP might
crash and core dump everything. Also remember that the Subject: line is sent
in the clear (together with all the other headers). Thus, take care to
choose a non-sensitive subject. If you run Elm-PGP from a remote work-
station, remember this: Each time you type in your PASSPHRASE you give
it away to the persons who might be snooping on the network. Be careful,
and use an encrypting telnet (or a secure IP layer like SKIP) for such
occasions!
Please don't mail your secret keyring. (Not that Elm-PGP would allow you to
do so directly). It is a) not very clever to send long-term secrets in an
open mail, and b) does slightly confuse the receiving Elm-PGP ;-)
Since the Elm-PGP patches have not been tested widely, it might also be
wise not to install it setuid or setgid. It might be possible to deliberately
crash Elm-PGP end end up in a root shell.
That's all there is to know about Elm-PGP.
4. Changes:
-----------
For version 6:
- Fixed numerous typos, glitches, errors in the help files and
fixed some screen update problems and other loose ends.
- Added a fix to Configure to work properly with GNU "nr"
- Fixed the Makefile so that elm-help.4 will be installed on make install.
- Changed hot keys:
si(g)n instead of C)learsign (the message didn't fit into 1 line)
ke(y) management instead of ^K
- Signing and encrypting a key is now allowed.
- Added support for PGP keys to mail address links. You can use this
function to alias keys, add keys for multiple recipients (when
using a mailing list), etc.
- Key management sub-menu:
* Display proper error message when trying to remove signature from
a disabled key.
* Keys are now sent from the key management sub-menu. Multiple keys
can be tagged.
* Keys can be tagged and added to a key/address link
* The key/address link file can be edited
* Changed a few hot keys
* Made menu and help more consistent with the alias sub-menu.
* All functions now use the key ID instead of the user name.
- Use the current key ring (i.e. the one selected in the key management
sub-menu) when adding keys from an e-mail and when sending keys.
- Deleting keys is now interactive and will therefore work if a user
has multiple user IDs.
- Messages can now be interlocked (i.e. the software will detect PGP
messages and keys within encrypted messages), ad infinitum.
For version 5a:
- Fixed check for keyring to look for config-file too, should now correctly
handle default path of pgp.
- Added hints about ENCRYPTTOSELF to README
- Changed 'E' to 'P'
- Before sending keyring the user is asked if ok
- Messages are encrypted for bcc-keys too
- Created HISTORY.PGP file, contains comments and changes
- Fixed configure-script to handle non-existence of pgp
- Internal fixes...
- Fixed some typos
For version 5:
I have changed the following from Mic's PGPELM implementation:
PGP pass phrase:
- will not be stored in the environment
- will be copied from the PGPPASS variable if it is set
- will be cleared when <&><Enter> is pressed
- will be cleared when program exit()s
- will be queried in 'Send only mode', too.
PGP support will be disabled after three bad passwords instead of halting
the program.
Key assignments:
- Changed not to conflict with the ELM standard keys
Environment variables:
- ELMPGP=YES is equivalent to the -P option
- PGPPASS variable is supported (see above)
Send mail menu:
- check for public keys automatically and encrypt if possible
- support for pgpexclude file
- removed extra p)gp menu
- p)lain send option available to send unsigned and un-encrypted text
- C)learsign available to send signed mail only
- '&' is able to toggle pgp mode in send menu too
- expand alias and carbon copy names properly
Main display:
- second char in row shows type of message
- added PGP keyring manager, reachable via ^K
MIME support:
- removed x-application dependency, PGP messages will be recognized
regardless of the MIME information (the whole message is scanned)
- only encrypted messages and public key messages will get the MIME
header so all people can read signed messages
- replaced MIME application types with "application/pgp" as suggested
in the PGP documentation
Message display:
- display bounced messages properly (not only the PGP part)
- display messages consisting of more than one PGP part properly
- recognize pgp encrypted mails not sent by another Elm-PGP
Misc.:
- find PGP keys independent of the PGP_SLASH configuration option
- display "Please wait..." message where appropriate
- pipe pgp output to /dev/null in some cases to preserve the screen
layout
- don't call PGP via the shell
- use pipes to communicate with PGP in some places (pass phrase)
- renamed default mail folder to Mail instead of mail
- print and pipe work with more than 1 message
- Batch and Send only mode work
- upgraded to PL24 and created a clean diff
- removed a bunch of bugs (and introduced a few new ones :)
And many many other changes...
5. PGP Invocations:
-------------------
PGP is invoked fordifferent purposes by Elm-PGP. This is an (as of PGP6)
exhaustive list of invocation methods:
encrypt:
pgp -sweat +force +batchmode +encrypttoself +verbose=0
[+pubring=/selected/pubring.pgp] tmpfile key-IDs
sign:
pgp -staw +force +batchmode +verbose=0 +clearsign=on tmpfile
passphrase-check:
pgp -sbf +batchmode +force +vebose=0 +textmode=off (on -1 fd)
sending pgp keys:
pgp -kxaf +verbose=0 +batchmode (on fd pointing to tmpfile)
decryption/signature checking:
pgp -t +batchmode _verbose=0 +force [+pubring=/sected/pubring.pgp tmpfile
key extraction:
pgp -ka +verbose=0 +interactive=on tmpfile [keyring]
key management (generating list):
pgp -kvvc +batchmode [keyring]
key management (key deletion):
pgp -kr +verbose=0 key-ID [keyring]
key management (key modification):
pgp -ke +verbose=0 key-ID [keyring]
key management (key signing):
pgp -ks +verbose=0 key-ID [keyring]
key management (key signature removal):
pgp -krs +verbose=0 key-ID [keyring]
key management (key signature dis/enabling):
pgp -kd +verbose=0 key-ID [keyring]
========== And now some PGP keys ==========
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: 2.6.2
mQCNAi1CDBsAAAEEALPQMXYAKg7CU/ZSfjGWxDrsxUyiXwQ49AgGnojhoSIAt9A4
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