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   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 }