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 #include "auth.h" 14 15 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 current->cap_effective = 72 cap_drop_nfsd_set(current->cap_effective); 73 } else { 74 current->cap_effective = 75 cap_raise_nfsd_set(current->cap_effective, 76 current->cap_permitted); 77 } 78 return ret; 79 } 80