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 #include <linux/vserver/xid.h>
  13
  14 #define CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))
  15
  16 int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
  17 {
  18         struct svc_cred cred = rqstp->rq_cred;
  19         int i;
  20         int ret;
  21
  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;
  28                 if (!cred.cr_uid)
  29                         cred.cr_uid = exp->ex_anon_uid;
  30                 if (!cred.cr_gid)
  31                         cred.cr_gid = exp->ex_anon_gid;
  32                 gi = groups_alloc(cred.cr_group_info->ngroups);
  33                 if (gi)
  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;
  37                                 else
  38                                         GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
  39                         }
  40                 cred.cr_group_info = gi;
  41         } else
  42                 get_group_info(cred.cr_group_info);
  43
  44         if (cred.cr_uid != (uid_t) -1)
  45                 current->fsuid = INOXID_UID(XID_TAG_NFSD, cred.cr_uid, cred.cr_gid);
  46         else
  47                 current->fsuid = exp->ex_anon_uid;
  48         if (cred.cr_gid != (gid_t) -1)
  49                 current->fsgid = INOXID_GID(XID_TAG_NFSD, cred.cr_uid, cred.cr_gid);
  50         else
  51                 current->fsgid = exp->ex_anon_gid;
  52
  53         /* this desperately needs a tag :) */
  54         current->xid = INOXID_XID(XID_TAG_NFSD, cred.cr_uid, cred.cr_gid, 0);
  55
  56         if (!cred.cr_group_info)
  57                 return -ENOMEM;
  58         ret = set_current_groups(cred.cr_group_info);
  59         put_group_info(cred.cr_group_info);
  60         if (INOXID_UID(XID_TAG_NFSD, cred.cr_uid, cred.cr_gid)) {
  61                 cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
  62         } else {
  63                 cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
  64                                                   current->cap_permitted);
  65         }
  66         return ret;
  67 }