nfsd4: remove unused deleg dprintk's.
[linux-2.6.git] / fs / nfsd / auth.c
1 /* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */
2
3 #include <linux/sched.h>
4 #include "nfsd.h"
5 #include "auth.h"
6
7 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
8 {
9         struct exp_flavor_info *f;
10         struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
11
12         for (f = exp->ex_flavors; f < end; f++) {
13                 if (f->pseudoflavor == rqstp->rq_flavor)
14                         return f->flags;
15         }
16         return exp->ex_flags;
17
18 }
19
20 int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
21 {
22         struct group_info *rqgi;
23         struct group_info *gi;
24         struct cred *new;
25         int i;
26         int flags = nfsexp_flags(rqstp, exp);
27         int ret;
28
29         validate_process_creds();
30
31         /* discard any old override before preparing the new set */
32         revert_creds(get_cred(current->real_cred));
33         new = prepare_creds();
34         if (!new)
35                 return -ENOMEM;
36
37         new->fsuid = rqstp->rq_cred.cr_uid;
38         new->fsgid = rqstp->rq_cred.cr_gid;
39
40         rqgi = rqstp->rq_cred.cr_group_info;
41
42         if (flags & NFSEXP_ALLSQUASH) {
43                 new->fsuid = exp->ex_anon_uid;
44                 new->fsgid = exp->ex_anon_gid;
45                 gi = groups_alloc(0);
46                 if (!gi)
47                         goto oom;
48         } else if (flags & NFSEXP_ROOTSQUASH) {
49                 if (!new->fsuid)
50                         new->fsuid = exp->ex_anon_uid;
51                 if (!new->fsgid)
52                         new->fsgid = exp->ex_anon_gid;
53
54                 gi = groups_alloc(rqgi->ngroups);
55                 if (!gi)
56                         goto oom;
57
58                 for (i = 0; i < rqgi->ngroups; i++) {
59                         if (!GROUP_AT(rqgi, i))
60                                 GROUP_AT(gi, i) = exp->ex_anon_gid;
61                         else
62                                 GROUP_AT(gi, i) = GROUP_AT(rqgi, i);
63                 }
64         } else {
65                 gi = get_group_info(rqgi);
66         }
67
68         if (new->fsuid == (uid_t) -1)
69                 new->fsuid = exp->ex_anon_uid;
70         if (new->fsgid == (gid_t) -1)
71                 new->fsgid = exp->ex_anon_gid;
72
73         ret = set_groups(new, gi);
74         put_group_info(gi);
75         if (ret < 0)
76                 goto error;
77
78         if (new->fsuid)
79                 new->cap_effective = cap_drop_nfsd_set(new->cap_effective);
80         else
81                 new->cap_effective = cap_raise_nfsd_set(new->cap_effective,
82                                                         new->cap_permitted);
83         validate_process_creds();
84         put_cred(override_creds(new));
85         put_cred(new);
86         validate_process_creds();
87         return 0;
88
89 oom:
90         ret = -ENOMEM;
91 error:
92         abort_creds(new);
93         return ret;
94 }
95