From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2112.outbound.protection.outlook.com [40.107.243.112]) by sourceware.org (Postfix) with ESMTPS id 7F9443857C66 for ; Thu, 26 Nov 2020 17:06:45 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 7F9443857C66 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=BNc5sFdRpkqZ7Dqsekuvg7VAV8KPHKjVuSnOmUi/qAT2QU+ZN2b0iwE5OvhJ5aaOne5picV+/uWDk0RMDpB2bJwZ0e/dFPTZmLwH9VYbLzKShJFSdePbRgsD8qn1wAPkVTtsm0Ydg8a27gSL8/iSMAaxC3+Z+PaUoRuWFbAfkmhJAU9Izjic2d2ZiZZc1VsPO6U50CRvl6LPEWZg1AprYAe+oP1aAx7V/4JLWe71UWY7kvCLQBB2JYkwUWV1KhmLBa9+xMMhLlEaPMId+E6z/xB17aOtDb2Pg4Ntgu0rrtIRv0nds9AuudpvhtTAi5AqG/IbOACA5nU/Tm9JlJe5CA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=wQ8OSWHAfnT1gDewKZdo3cX+NdZ8KUFxI3Dx7pGfiqk=; 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I've >>>> pushed it to the topic/af_unix branch in case you want to review it and/or >>>> test it. >>> >>> This is soooo fantastic! Apart from files, the nexst most interesting >>> case is sharing a socket, probably. We could activcate the 2nd half of >>> privilege separation in sshd then. >> >> I've pushed a first attempt to implement sending socket descriptors, but I >> haven't yet tested it. I'll try to find a small test program and then, if >> all goes well, take a look at sshd. I've now tested it with a small program that forks a subprocess, accepts a connection on an AF_INET socket, and sends the resulting socket descriptor to the child, using an AF_UNIX socketpair for parent-child communication. It seems to work as expected. The test is in winsup/cygwin/socket_tests on the topic/af_unix branch, with a description of how to run it in README.txt. I took a quick glance at the openssh code, and I think I see places where pty/tty descriptors are sent. For example, I see calls like mm_send_fd(sock, s->ttyfd). So maybe I need to try to add support for that next. This could take some time since I'm not familiar with the code for fhandler_termios or any of its derived classes, nor do I have any idea how to test sending that kind of fd. Ken