4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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/vs_tag.h>
14 #define CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))
16 int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
18 struct svc_cred cred = rqstp->rq_cred;
22 if (exp->ex_flags & NFSEXP_ALLSQUASH) {
23 cred.cr_uid = exp->ex_anon_uid;
24 cred.cr_gid = exp->ex_anon_gid;
25 cred.cr_group_info = groups_alloc(0);
26 } else if (exp->ex_flags & NFSEXP_ROOTSQUASH) {
27 struct group_info *gi;
29 cred.cr_uid = exp->ex_anon_uid;
31 cred.cr_gid = exp->ex_anon_gid;
32 gi = groups_alloc(cred.cr_group_info->ngroups);
34 for (i = 0; i < cred.cr_group_info->ngroups; i++) {
35 if (!GROUP_AT(cred.cr_group_info, i))
36 GROUP_AT(gi, i) = exp->ex_anon_gid;
38 GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
40 cred.cr_group_info = gi;
42 get_group_info(cred.cr_group_info);
44 if (cred.cr_uid != (uid_t) -1)
45 current->fsuid = INOTAG_UID(DX_TAG_NFSD, cred.cr_uid, cred.cr_gid);
47 current->fsuid = exp->ex_anon_uid;
48 if (cred.cr_gid != (gid_t) -1)
49 current->fsgid = INOTAG_GID(DX_TAG_NFSD, cred.cr_uid, cred.cr_gid);
51 current->fsgid = exp->ex_anon_gid;
53 /* this desperately needs a tag :) */
54 current->xid = (xid_t)INOTAG_TAG(DX_TAG_NFSD, cred.cr_uid, cred.cr_gid, 0);
56 if (!cred.cr_group_info)
58 ret = set_current_groups(cred.cr_group_info);
59 put_group_info(cred.cr_group_info);
60 if (INOTAG_UID(DX_TAG_NFSD, cred.cr_uid, cred.cr_gid)) {
61 cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
63 cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
64 current->cap_permitted);