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#include <u.h>
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#include <libc.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){
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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 = 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 = write(fd, ai->cap, strlen(ai->cap));
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	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 = open("/srv/factotum", ORDWR);
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	if(fd >= 0)
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		mount(fd, -1, "/mnt", MREPL, "");
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	/* set up new namespace */
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	return newns(ai->cuid, ns);
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}