Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc-merge
[linux-2.6] / fs / nfsd / auth.c
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
15 int 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 }