xref: /openbmc/linux/fs/nfsd/auth.c (revision f42b3800)
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 #include <linux/nfsd/export.h>
13 
14 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
15 {
16 	struct exp_flavor_info *f;
17 	struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
18 
19 	for (f = exp->ex_flavors; f < end; f++) {
20 		if (f->pseudoflavor == rqstp->rq_flavor)
21 			return f->flags;
22 	}
23 	return exp->ex_flags;
24 
25 }
26 
27 int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
28 {
29 	struct svc_cred	cred = rqstp->rq_cred;
30 	int i;
31 	int flags = nfsexp_flags(rqstp, exp);
32 	int ret;
33 
34 	if (flags & NFSEXP_ALLSQUASH) {
35 		cred.cr_uid = exp->ex_anon_uid;
36 		cred.cr_gid = exp->ex_anon_gid;
37 		cred.cr_group_info = groups_alloc(0);
38 	} else if (flags & NFSEXP_ROOTSQUASH) {
39 		struct group_info *gi;
40 		if (!cred.cr_uid)
41 			cred.cr_uid = exp->ex_anon_uid;
42 		if (!cred.cr_gid)
43 			cred.cr_gid = exp->ex_anon_gid;
44 		gi = groups_alloc(cred.cr_group_info->ngroups);
45 		if (gi)
46 			for (i = 0; i < cred.cr_group_info->ngroups; i++) {
47 				if (!GROUP_AT(cred.cr_group_info, i))
48 					GROUP_AT(gi, i) = exp->ex_anon_gid;
49 				else
50 					GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
51 			}
52 		cred.cr_group_info = gi;
53 	} else
54 		get_group_info(cred.cr_group_info);
55 
56 	if (cred.cr_uid != (uid_t) -1)
57 		current->fsuid = cred.cr_uid;
58 	else
59 		current->fsuid = exp->ex_anon_uid;
60 	if (cred.cr_gid != (gid_t) -1)
61 		current->fsgid = cred.cr_gid;
62 	else
63 		current->fsgid = exp->ex_anon_gid;
64 
65 	if (!cred.cr_group_info)
66 		return -ENOMEM;
67 	ret = set_current_groups(cred.cr_group_info);
68 	put_group_info(cred.cr_group_info);
69 	if ((cred.cr_uid)) {
70 		current->cap_effective =
71 			cap_drop_nfsd_set(current->cap_effective);
72 	} else {
73 		current->cap_effective =
74 			cap_raise_nfsd_set(current->cap_effective,
75 					   current->cap_permitted);
76 	}
77 	return ret;
78 }
79