4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 #include <linux/sched.h>
8 #include <linux/nfsd/nfsd.h>
11 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
13 struct exp_flavor_info *f;
14 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
16 for (f = exp->ex_flavors; f < end; f++) {
17 if (f->pseudoflavor == rqstp->rq_flavor)
24 int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
26 struct group_info *rqgi;
27 struct group_info *gi;
30 int flags = nfsexp_flags(rqstp, exp);
33 validate_process_creds();
35 /* discard any old override before preparing the new set */
36 revert_creds(get_cred(current->real_cred));
37 new = prepare_creds();
41 new->fsuid = rqstp->rq_cred.cr_uid;
42 new->fsgid = rqstp->rq_cred.cr_gid;
44 rqgi = rqstp->rq_cred.cr_group_info;
46 if (flags & NFSEXP_ALLSQUASH) {
47 new->fsuid = exp->ex_anon_uid;
48 new->fsgid = exp->ex_anon_gid;
52 } else if (flags & NFSEXP_ROOTSQUASH) {
54 new->fsuid = exp->ex_anon_uid;
56 new->fsgid = exp->ex_anon_gid;
58 gi = groups_alloc(rqgi->ngroups);
62 for (i = 0; i < rqgi->ngroups; i++) {
63 if (!GROUP_AT(rqgi, i))
64 GROUP_AT(gi, i) = exp->ex_anon_gid;
66 GROUP_AT(gi, i) = GROUP_AT(rqgi, i);
69 gi = get_group_info(rqgi);
72 if (new->fsuid == (uid_t) -1)
73 new->fsuid = exp->ex_anon_uid;
74 if (new->fsgid == (gid_t) -1)
75 new->fsgid = exp->ex_anon_gid;
77 ret = set_groups(new, gi);
83 new->cap_effective = cap_drop_nfsd_set(new->cap_effective);
85 new->cap_effective = cap_raise_nfsd_set(new->cap_effective,
87 validate_process_creds();
88 put_cred(override_creds(new));
90 validate_process_creds();