1/*
2 * linux/fs/nfsd/auth.c
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include <linux/types.h>
8#include <linux/sched.h>
9#include <linux/sunrpc/svc.h>
10#include <linux/sunrpc/svcauth.h>
11#include <linux/nfsd/nfsd.h>
12
13#define	CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))
14
15int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
16{
17	struct svc_cred	cred = rqstp->rq_cred;
18	int i;
19	int ret;
20
21	if (exp->ex_flags & NFSEXP_ALLSQUASH) {
22		cred.cr_uid = exp->ex_anon_uid;
23		cred.cr_gid = exp->ex_anon_gid;
24		cred.cr_group_info = groups_alloc(0);
25	} else if (exp->ex_flags & NFSEXP_ROOTSQUASH) {
26		struct group_info *gi;
27		if (!cred.cr_uid)
28			cred.cr_uid = exp->ex_anon_uid;
29		if (!cred.cr_gid)
30			cred.cr_gid = exp->ex_anon_gid;
31		gi = groups_alloc(cred.cr_group_info->ngroups);
32		if (gi)
33			for (i = 0; i < cred.cr_group_info->ngroups; i++) {
34				if (!GROUP_AT(cred.cr_group_info, i))
35					GROUP_AT(gi, i) = exp->ex_anon_gid;
36				else
37					GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
38			}
39		cred.cr_group_info = gi;
40	} else
41		get_group_info(cred.cr_group_info);
42
43	if (cred.cr_uid != (uid_t) -1)
44		current->fsuid = cred.cr_uid;
45	else
46		current->fsuid = exp->ex_anon_uid;
47	if (cred.cr_gid != (gid_t) -1)
48		current->fsgid = cred.cr_gid;
49	else
50		current->fsgid = exp->ex_anon_gid;
51
52	if (!cred.cr_group_info)
53		return -ENOMEM;
54	ret = set_current_groups(cred.cr_group_info);
55	put_group_info(cred.cr_group_info);
56	if ((cred.cr_uid)) {
57		cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
58	} else {
59		cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
60						  current->cap_permitted);
61	}
62	return ret;
63}
64