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/nfsd/export.h> 13 14 int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp) 15 { 16 struct exp_flavor_info *f; 17 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; 18 19 for (f = exp->ex_flavors; f < end; f++) { 20 if (f->pseudoflavor == rqstp->rq_flavor) 21 return f->flags; 22 } 23 return exp->ex_flags; 24 25 } 26 27 int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp) 28 { 29 struct svc_cred cred = rqstp->rq_cred; 30 int i; 31 int flags = nfsexp_flags(rqstp, exp); 32 int ret; 33 34 if (flags & NFSEXP_ALLSQUASH) { 35 cred.cr_uid = exp->ex_anon_uid; 36 cred.cr_gid = exp->ex_anon_gid; 37 cred.cr_group_info = groups_alloc(0); 38 } else if (flags & NFSEXP_ROOTSQUASH) { 39 struct group_info *gi; 40 if (!cred.cr_uid) 41 cred.cr_uid = exp->ex_anon_uid; 42 if (!cred.cr_gid) 43 cred.cr_gid = exp->ex_anon_gid; 44 gi = groups_alloc(cred.cr_group_info->ngroups); 45 if (gi) 46 for (i = 0; i < cred.cr_group_info->ngroups; i++) { 47 if (!GROUP_AT(cred.cr_group_info, i)) 48 GROUP_AT(gi, i) = exp->ex_anon_gid; 49 else 50 GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i); 51 } 52 cred.cr_group_info = gi; 53 } else 54 get_group_info(cred.cr_group_info); 55 56 if (cred.cr_uid != (uid_t) -1) 57 current->fsuid = cred.cr_uid; 58 else 59 current->fsuid = exp->ex_anon_uid; 60 if (cred.cr_gid != (gid_t) -1) 61 current->fsgid = cred.cr_gid; 62 else 63 current->fsgid = exp->ex_anon_gid; 64 65 if (!cred.cr_group_info) 66 return -ENOMEM; 67 ret = set_current_groups(cred.cr_group_info); 68 put_group_info(cred.cr_group_info); 69 if ((cred.cr_uid)) { 70 current->cap_effective = 71 cap_drop_nfsd_set(current->cap_effective); 72 } else { 73 current->cap_effective = 74 cap_raise_nfsd_set(current->cap_effective, 75 current->cap_permitted); 76 } 77 return ret; 78 } 79