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Open Source and information security mailing list archives
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Date: Sun, 05 Oct 2008 21:41:22 +0000 From: John Kelly <jak@...2dial.com> To: linux-kernel@...r.kernel.org Subject: User credentials on a unix datagram socket The socket(7) man page seems to imply that user credentials cannot be sent on a unix datagram socket, unless socketpair() created it. > SO_PEERCRED > Return the credentials of the foreign process connected to this socket. > This is only possible for connected AF_UNIX stream sockets and AF_UNIX > stream and datagram socket pairs created using socketpair(2); But through trial and error, without reading any kernel source, I learned that you can send user credentials on a regular unix datagram socket which was not created with socketpair(). I'm unsure what SO_PEERCRED is intended for; I used SO_PASSCRED in my server code, and it works. I'm glad it does. Stream sockets would require a file descriptor for each client. Ugh. What I want to do is so much simpler with datagram sockets. I have sample code at ftp://ftp.isp2dial.com/users/jak/src/test/uxdg/ I hope someone will revise the man page and explain that you can pass user credentials on a unix datagram socket, even one not created with socketpair(). This is a very useful feature. Please keep it in the kernel! -- Webmail for Dialup Users http://www.isp2dial.com/freeaccounts.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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