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- FSC-0005
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- The Opus Computer-Based Conversation System
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- (c) Copyright 1987, Wynn Wagner III, All Rights Reserved
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- OPUS-CBCS
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- Matrix Password Methods
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- MATRIX PASSWORDS USED BY OPUS
- -----------------------------
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- Opus uses two kinds of passwords for matrix sessions:
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- SESSION LEVEL access code is roughly the same sort
- of thing as a user's password. It is
- passed from one system to another during
- the session negotiation sequence (aka
- YooHoo) and is in effect for the entire
- matrix session.
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- TRANSACTION LEVEL passwords are valid only for WaZOO
- "ZedZap" style file requests. They are a
- way to protect requestable material on a
- file-by-file basis.
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- MATRIX PASSWORDS USED BY OTHER<tm> SYSTEMS
- ------------------------------------------
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- It is possible that Opus will be sensitive to passwords produced
- by other netmail software. Because other password methods have
- not been documented or their behavior publicly explained, the
- compatibility between Opus and non-WaZOO systems isn't assured.
-
- Apparently the behavior of some other methods involves protection
- against unauthorized "pickup" of material that is on hold. You
- can make a case that Opus does this as well. Opus uses a true
- session-level protection scheme. Unauthorized pickup is avoided
- in that the remote system will find itself without a carrier.
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- Within a couple of days of the scheduled release of Opus 1.00,
- we discovered a change in the implementation of some "bark" style
- file request programs. The change was made to the method of
- exchange the name of the file being requested and apparently
- offers some kind of transaction-level password. There was no
- attempt to include this change in Opus 1.00.
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- PASSWORDS
- ---------
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- A password consists of 4 to 6 characters or numbers and is
- case insensitive. The password cannot contain white space,
- control codes, or punctuation (except an underscore).
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- Valid characters for passwords are
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- "a".."z", "A".."Z", "0".."9", "_"
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- SETTING UP A SESSION LEVEL PROTECTION SYSTEM
- --------------------------------------------
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- UPFRONT
- -------
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- Both sides of a password protected session use the same access
- code. My system's password on your system is your password on
- my system.
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- OPUSNODE
- --------
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- The OPUSnode program (by Wes Cowley) has facilities for dealing
- with Opus-compatible passwords beginning with version 1.4.4.
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- STORING PASSWORDS
- -----------------
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- This is fairly technical information about the storage of
- matrix passwords.
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- There are plans to change the structure of the node list file
- (NODELIST.SYS), and the new structure has room for a 6-character
- password. That's in the future. For the present, we have to have
- some place to store the password.
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- This kludge is about as temporary as they come. The correct way to
- handle passwords is to have a structure that can handle them. The
- current node list structure has no such field. It does, however,
- have an extra-ordinarily amount of space to hold the CITY.
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- The CITY in the NodeList.Sys file is 40 characters. If you want to
- put a session level password in the node list file, you can do so.
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- NORMAL CITY: ccccccccccccccccccnnnnnnnnnnnnnnn
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- PASSWORDED CITY: ccccccccccccccccccn!ppppppnnnnnnn
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- c = city information
- n = null (ascii zero)
- ! = exclamation point (or "=")
- p = password information
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- In other words, to put a password into the node list CITY record,
- follow the city with a null and an exclamation point and a
- null-terminated password.
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- An equals sign can appear instead of an exclamation point. This
- has a special meaning to ECHO GUARD (see below).
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- METHOD
- ------
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- The session level password is used during the YooHoo negotiation.
- If there is a problem, Opus will drop carrier on the caller and
- make a "*" type log entry.
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- As a confidence factor, successful passwords will be logged with
- a tracer ("#") style entry.
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- SETTING UP A TRANSACTION LEVEL PROTECTION SYSTEM
- ------------------------------------------------
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- Transaction level passwords only work with WaZOO "ZedZap"
- style file requests.
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- ORIGINATING SYSTEM
- ------------------
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- The REQUESTING system puts the required transaction level
- access code into its REQ file.
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- EXAMPLE: NEATFILE.ARC !mypass_x
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- SYSTEM WITH REQUESTED FILES
- ---------------------------
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- The REQUESTED system has passwords in its `OkFile.'
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- EXAMPLE: c:\files\neat*.arc !mypass_x
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- NOTE: Password protected files will not be
- available to non-WaZOO file requesters.
- There is no known method for having an
- access code in the "BARK" style file
- request, so Opus just pretends it doesn't
- have the file available if such a request
- comes in.
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- ECHOGUARD
- ---------
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- IMPORTANT: As with the rest of Opus, there is no
- guarantee that anything will work as
- documented. Because EchoGuard is a
- security feature, this fact needs to
- be stressed...
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- THERE IS NO ASSURANCE THAT
- ECHOGUARD WILL OFFER YOU ANY
- KIND OF PROTECTION.
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- EchoGuard is a method to trap many attempts "unauthorized"
- echomail attempts. There is an undocumented control file
- switch for this:
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- ECHO Guard
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- If this switch is set, Opus will mark many unauthorized
- messages so they won't be scanned and sent to other systems.
- EchoGuard does NOT prevent the message(s) in an unauthorized
- bundle from being tossed.
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- Opus assumes bundles from password-protected systems have
- already passed the access code test. If it finds a "=" instead
- of a "!" in the NodeList.Sys file where the password would go,
- it treats the packet as though it were approved. In other
- words, you can use EchoGuard even though you exchange echomail
- with some non-WaZOO systems. For the WaZOO systems, use a
- "!" and password in NodeList.Sys.
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- For the non WaZOO systems, use a "=" character. The equals
- sign tells the ECHO GUARD routine that the system in question
- is not capable of handling session level passwords.
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- Unauthorized messages sent to echomail areas will be flagged
- as "Sent" and "Orphan" to keep other scan programs from
- sending them to anybody else.
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