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03.03.2004 at 04:51AM PST, ID: 20905368
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8.8

Does Linux Support ImpersonateValidUser?

Asked by elsamman in Linux Programming

Tags: , ,

I am writing a daemon that receives requests via a named pipe.  It must carry out file related activities on behalf of the requesting user.  The sender is a CGI program that prompts the user for an ID and password and includes both of these in the request it writes to the named pipe.

The question is how to implement this.  The most secure way would be to run the daemon is an underprivileged user and then impersonate the requesting user who will supply credentials (ID and password).  In Windows this is possible.

In Unix the only way I can think of to do this is run the daemon as a super-user, check the credentials by running crypt on the supplied password and comparing it to the shadow password file.  Only then is the file system ID changed.

The Windows method seems to me more secure since I don’t have to run the daemon as root.  Is there any equivalent function in Linux to ImpersonateValidUser that lets a non-super user impersonate another user?
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[+][-]03.03.2004 at 05:30AM PST, ID: 10504273

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Zone: Linux Programming
Tags: impersonatevaliduser, linux, user
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Solution Provided By: jlevie
Participating Experts: 2
Solution Grade: A
 
 
[+][-]03.04.2004 at 05:42AM PST, ID: 10513679

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[+][-]03.04.2004 at 06:52AM PST, ID: 10514322

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