README for the PGP6 patch to ELM 2.4 PL24

Blurb

Authors and contact addresses

Primary contact address for the PGP6 patch is caronni@tik.ee.ethz.ch 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 egd017@cent1.lancs.ac.uk; we tried to 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

Features of Elm-PGP

1. 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.
2. 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.
3. The pass phrase is not kept in the environment and not passed as a command line parameter. The pipe mechanism of PGP is used.
4. Printing, piping, batch mode, etc. are supported.

Installation

1. 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.
2. 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.
3. 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: john.doe@magic.net 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.
4. Make Elm-PGP (make elm or pmake elm) and run strip bin/*.
5. Make a backup copy of standard Elm.
6. Move Elm-PGP to its proper place and set the permissions. This can be done automatically by make install or pmake install.
7. 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)
8. 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.
9. 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.

10. 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.
11. 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.

Using Elm-PGP

• 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.

• 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.

• 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
      hl@slow.ibmxt
      doe@ihatepgp.encrypted.mail 
  

  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.

• 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 caronni@tik.ee.ethz.ch, but only have the key of gec@acm.org. Select the key of 'gec', press 'n' and enter the address caronni@tik.ee.ethz.ch. The same is helpful if reply addresses do not match user IDs, as provided in the keyring.
  • If rmuchsel@iiic.ethz.ch 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).

• 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.

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

• 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 <&> 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 :)

PGP Invocations

• 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
OLO7yccAm144i49hbguXnuxf4/RIZvWmkqgN8VSROG9DoMcus4/PlCSZaU5K0bCt
mUSlPEAL1c4gP9d54J/024MlwM50zsgmdgaXGaSpjqD4r5iFjkW/rgoB+dHxAAUR
tCFDaHJpcyBCbHVtIDxjaHJpc0BwaGlsLnVuaS1zYi5kZT60KENocmlzIEJsdW0g
PGNocmlzQGNocmlzLnRlbGlwLnVuaS1zYi5kZT60I0NocmlzIEJsdW0gPGNocmlz
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PnwUdbp/1V8kPz94GVXCh3/kohjp5uTcCFdGfKBxgkHV9N/5chhvV90ZtHPwH5Z7
REIbp/P8wcrAarOmBZjCIaW2yZiw41lAkSGJAJUCBRAthRDaRb+uCgH50fEBAY+P
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