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 } 64