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                 put_group_info(cred->cr_group_info);
  26                 cred->cr_group_info = groups_alloc(0);
  27         } else if (exp->ex_flags & NFSEXP_ROOTSQUASH) {
  28                 struct group_info *gi;
  29                 if (!cred->cr_uid)
  30                         cred->cr_uid = exp->ex_anon_uid;
  31                 if (!cred->cr_gid)
  32                         cred->cr_gid = exp->ex_anon_gid;
  33                 gi = groups_alloc(cred->cr_group_info->ngroups);
  34                 if (gi)
  35                         for (i = 0; i < cred->cr_group_info->ngroups; i++) {
  36                                 if (!GROUP_AT(cred->cr_group_info, i))
  37                                         GROUP_AT(gi, i) = exp->ex_anon_gid;
  38                                 else
  39                                         GROUP_AT(gi, i) = GROUP_AT(cred->cr_group_info, i);
  40                         }
  41                 put_group_info(cred->cr_group_info);
  42                 cred->cr_group_info = gi;
  43         }
  44
  45         if (cred->cr_uid != (uid_t) -1)
  46                 current->fsuid = INOXID_UID(cred->cr_uid, cred->cr_gid);
  47         else
  48                 current->fsuid = exp->ex_anon_uid;
  49         if (cred->cr_gid != (gid_t) -1)
  50                 current->fsgid = INOXID_GID(cred->cr_uid, cred->cr_gid);
  51         else
  52                 current->fsgid = exp->ex_anon_gid;
  53
  54         current->xid = INOXID_XID(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         if ((cred->cr_uid)) {
  60                 cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
  61         } else {
  62                 cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
  63                                                   current->cap_permitted);
  64         }
  65         return ret;
  66 }