| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | put_group_info(cred->cr_group_info); |
| 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 | put_group_info(cred->cr_group_info); |
| 41 | cred->cr_group_info = gi; |
| 42 | } |
| 43 | |
| 44 | if (cred->cr_uid != (uid_t) -1) |
| 45 | current->fsuid = cred->cr_uid; |
| 46 | else |
| 47 | current->fsuid = exp->ex_anon_uid; |
| 48 | if (cred->cr_gid != (gid_t) -1) |
| 49 | current->fsgid = cred->cr_gid; |
| 50 | else |
| 51 | current->fsgid = exp->ex_anon_gid; |
| 52 | |
| 53 | if (!cred->cr_group_info) |
| 54 | return -ENOMEM; |
| 55 | ret = set_current_groups(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 | } |