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Full Discussion: Email to a process
Top Forums UNIX for Dummies Questions & Answers Email to a process Post 27990 by Neo on Tuesday 10th of September 2002 06:36:44 PM
Old 09-10-2002
Many people simply pipe mail received by either an MTA or MUA to a process. An MTA, such as sendmail, can receive mail and pipe it to a process. Often, mail is received by an MTA and sent to a user mailbox via a local MUA, and the MUA forwards the mail, via a pipe, to the standard-in.

Often, in a .forward file in a user directory has something like,

"|/home/user/bin/myprocess".


Or, in a file like the sendmail aliases file:

joe.user: "|/home/user/bin/myprocess"


There are many reasons to do this, a person can simply send mail to a host and in the message have embedded tokens that could be used for anything imaginable... for example, you could send a message to a user aliase and have an embedded command (with embedded security) telling your home computer to turn off the lights in your house (if you had a interface to your home lighting)....

You can literally do anything you can imagine by sending mail to a process.... your imagination is the limit.... you could send mail to our home computer and with an embedded token that could be used by a process to activate a video camera, another example.
 

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LEARN ABOUT OPENSOLARIS

check-permissions

check-permissions(1M)					  System Administration Commands				     check-permissions(1M)

NAME

       check-permissions - check permissions on mail rerouting files

SYNOPSIS

       /usr/sbin/check-permissions [login]

DESCRIPTION

       The   check-permissions script is intended as a migration aid for sendmail(1M). It checks the /etc/mail/sendmail.cf file for all configured
       alias files, and checks the alias files for :include: files. It also checks for certain .forward files. For each file  that   check-permis-
       sions checks, it verifies that none of the parent directories are group- or world-writable. If any directories are overly permissive, it is
       reported. Otherwise it reports that no unsafe directories were found.

       As to which .forward files are checked, it depends on the arguments included on the command line. If no	argument  is  given,  the  current
       user's home directory is checked for the presence of a  .forward file. If any arguments are given, they are assumed to be valid logins, and
       the home directory of each one is checked.

       If the special argument ALL is given,  the passwd entry in the  /etc/nsswitch.conf file is checked, and all password entries  that  can	be
       obtained through the switch file are checked. In large domains, this can be time-consuming.

OPERANDS

       The following operands are supported:

       login	Where login is a valid user name, checks the home directory for  login.

       ALL	Checks the home directory of  all users.

FILES

       /etc/mail/sendmail.cf	Defines environment for  sendmail

       /etc/mail/aliases	Ascii mail aliases file

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsndmu 		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getent(1M), sendmail(1M), aliases(4), attributes(5)

SunOS 5.11							    10 Nov 2003 					     check-permissions(1M)
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