sys/src/lib9p/uid.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

#include <u.h>
#include <libc.h>
#include <auth.h>
#include <fcall.h>
#include <thread.h>
#include <9p.h>

/*
 * simplistic permission checking.  assume that
 * each user is the leader of her own group.
 */
int
hasperm(File *f, char *uid, int p)
{
	int m;

	m = f->mode & 7;	/* other */
	if((p & m) == p)
		return 1;

	if(strcmp(f->uid, uid) == 0) {
		m |= (f->mode>>6) & 7;
		if((p & m) == p)
			return 1;
	}

	if(strcmp(f->gid, uid) == 0) {
		m |= (f->mode>>3) & 7;
		if((p & m) == p)
			return 1;
	}

	return 0;
}