git.oblomov.eu Git - linux-2.6/blob - 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
  13 #define CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))
  14
  15 static int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp)
  16 {
  17         struct exp_flavor_info *f;
  18         struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
  19
  20         for (f = exp->ex_flavors; f < end; f++) {
  21                 if (f->pseudoflavor == rqstp->rq_flavor)
  22                         return f->flags;
  23         }
  24         return exp->ex_flags;
  25
  26 }
  27
  28 int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
  29 {
  30         struct svc_cred cred = rqstp->rq_cred;
  31         int i;
  32         int flags = nfsexp_flags(rqstp, exp);
  33         int ret;
  34
  35         if (flags & NFSEXP_ALLSQUASH) {
  36                 cred.cr_uid = exp->ex_anon_uid;
  37                 cred.cr_gid = exp->ex_anon_gid;
  38                 cred.cr_group_info = groups_alloc(0);
  39         } else if (flags & NFSEXP_ROOTSQUASH) {
  40                 struct group_info *gi;
  41                 if (!cred.cr_uid)
  42                         cred.cr_uid = exp->ex_anon_uid;
  43                 if (!cred.cr_gid)
  44                         cred.cr_gid = exp->ex_anon_gid;
  45                 gi = groups_alloc(cred.cr_group_info->ngroups);
  46                 if (gi)
  47                         for (i = 0; i < cred.cr_group_info->ngroups; i++) {
  48                                 if (!GROUP_AT(cred.cr_group_info, i))
  49                                         GROUP_AT(gi, i) = exp->ex_anon_gid;
  50                                 else
  51                                         GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
  52                         }
  53                 cred.cr_group_info = gi;
  54         } else
  55                 get_group_info(cred.cr_group_info);
  56
  57         if (cred.cr_uid != (uid_t) -1)
  58                 current->fsuid = cred.cr_uid;
  59         else
  60                 current->fsuid = exp->ex_anon_uid;
  61         if (cred.cr_gid != (gid_t) -1)
  62                 current->fsgid = cred.cr_gid;
  63         else
  64                 current->fsgid = exp->ex_anon_gid;
  65
  66         if (!cred.cr_group_info)
  67                 return -ENOMEM;
  68         ret = set_current_groups(cred.cr_group_info);
  69         put_group_info(cred.cr_group_info);
  70         if ((cred.cr_uid)) {
  71                 cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
  72         } else {
  73                 cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
  74                                                   current->cap_permitted);
  75         }
  76         return ret;
  77 }