Great Circle Associates Firewalls
(April 1995)
 

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Subject: Re: Telnet and ftp by E-Mail
From: padgett @ tccslr . dnet . mmc . com (A. Padgett Peterson, P.E. Information Security)
Date: Fri, 28 Apr 95 21:43:00 -0400
To: "firewalls @ greatcircle . com"@UVS1.dnet.mmc.com

Christopher rites:
>Same goes with e-mail.  
>mail person @
 host < file   and there are email->ftp gateways
>and you bypassed the ftp control. 

Well sorta, a lot depends on the gateways you go through. For one thing,
many E-mail gateways strip off control characters, others allow 7-bit only,
still others may convert an 0Dh,0Ah (carriage return/line feed) to 0Ah.
What EBCDIC converters do is to 'orrible to discuss.

For those wishing a true journey into the unknown, I suggest a careful
examination of RFC 822 "Standard For The Format of ARPANET Text Messages"
as referenced by RFC821 (SMTP). When your eyes uncross and the hic-cups
stop you will realize that mailers are liable to make many interpretations
is your message contains certain strings.

The eight-bit-strip is a nice one that can reduce a WORD document to mock-
Swedish. After a while you begin to realize just how much work went into
uuencode and why xxencode is really better.

Few people realize just how much obsession was required for my Christmas Card.

						Warmly,
							Padgett

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