51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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/* Portions of this file are Copyright (C) 2015-2018 Giacomo Tesio <giacomo@tesio.it>
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* See /doc/license/gpl-2.0.txt for details about the licensing.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <auth.h>
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/*
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* become the authenticated user
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*/
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int
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auth_chuid(AuthInfo *ai, char *ns)
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{
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int rv, fd;
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if(ai == nil || ai->cap == nil || ai->cap[0] == 0){
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werrstr("no capability");
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return -1;
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}
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/* change uid */
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fd = sys_open("#¤/capuse", OWRITE);
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if(fd < 0){
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werrstr("opening #¤/capuse: %r");
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return -1;
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}
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rv = jehanne_write(fd, ai->cap, strlen(ai->cap));
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sys_close(fd);
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if(rv < 0){
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werrstr("writing %s to #¤/capuse: %r", ai->cap);
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return -1;
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}
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/* get a link to factotum as new user */
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fd = sys_open("/srv/factotum", ORDWR);
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if(fd >= 0)
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sys_mount(fd, -1, "/mnt", MREPL, "", '9');
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/* set up new namespace */
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return newns(ai->cuid, ns);
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}
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