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