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- Path: sparky!uunet!decwrl!infopiz!mccall!ipmdf-newsgate!list
- Newsgroups: vmsnet.mail.pmdf
- Subject: RE: Limiting access to outgoing mail.
- Message-ID: <01GOMWWKNOPU9FMFX6@INNOSOFT.COM>
- From: "Daniel C. Newman" <dan@innosoft.com>
- Date: 10 Sep 1992 22:49:01 -0700 (PDT)
- Organization: The Internet
- Return-Path: <epmdf@YMIR.CLAREMONT.EDU>
- Resent-Date: 10 Sep 1992 22:49:01 -0700 (PDT)
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-
- > We have the exact same situation here on our campus, and I think that the
- > solution is just a bit impractical. On our campus, there are over 1000
- > accounts that *should* be able to use mail, but only about 50 that should
- > not. Our system would be a rightslist nightmare if we tried this.
-
- We at Innosoft certainly agree that the present mechanisms in PMDF are not
- terribly practical. We've already implemented in PMDF V4.2 a new, more
- practical mechanism. We're also planning some new ACL based mechanisms since
- VMS is moving more-and-more in that direction with new and improved ACL support
- anticipated.
-
- The input from the PMDF community has, as always, been quite helpful and was
- what gave us the final nudge a few months back to implement the new support in
- V4.2.
-
- I shall summarize below the new support so that anyone spotting any missing
- functionality, blunders, or whatnot can bring them to our attention now,
- well in time for the next release. And of course, further ideas are always
- welcome.
-
- The new support is implemented with a table in the mapping file. Entries
- in this table specify: the channel a message is coming from, the address of
- the sender, the channel a message is going to, the to address, and finally
- whether or not to permit the message to pass to the "to" channel:
-
- from_channel|from_address|to_channel|to_address $Y/$N
-
- Wild cards may be used for any or all of the first four items in an entry.
- If a message is not permitted to pass to the to channel, then it is bounced
- back to the from address. Optionally, an error message to be returned with
- the bounced message may be specified.
-
- The ability to specify wild cards makes this facility quite flexible. Clearly,
- however, when there is no pattern to a set of to or from addresses requiring
- access control, this scheme devolves to creating individual entries for each
- address in that set. It is here that ACL schemes or some other mechanism may
- prove more apt.
-
- Dan
-
- ----------------------------------------------------------------------------
- >> I'd like to be able to limit access to non-local (off-node) email.
- >> I'm thinking that I can define a rights id, say 'NO_OUTMAIL' for example,
- >> and set the appropriate image with an ACL such that anyone holding that id
- >> cannot send internet mail messages. My questions are simple: Will this
- >> work? and, which image(s) should be set this way?
- >
- > This won't work since the users only run VMS MAIL or DECWindows MAIL. They
- > don't run the actual images which send outbound mail. Instead, you probably
- > want to associated this rightlist identifier with, say, your TCP/IP channel.
- > You do this by merely specifying the rightlist id as a channel keyword; e.g.,
- >
- > mtcp_local single smtp mx no_outmail
- >
- > Then, only processes with the no_outmail rightslist id can queue mail to
- > the mtcp_local channel. Be sure to grant this rightslist id to whatever
- > accounts PMDF may run under!
-
-