/* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */ #include <linux/sched.h> #include "nfsd.h" #include "auth.h" int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp) { struct exp_flavor_info *f; struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; for (f = exp->ex_flavors; f < end; f++) { if (f->pseudoflavor == rqstp->rq_flavor) return f->flags; } return exp->ex_flags; } int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp) { struct group_info *rqgi; struct group_info *gi; struct cred *new; int i; int flags = nfsexp_flags(rqstp, exp); int ret; validate_process_creds(); /* discard any old override before preparing the new set */ revert_creds(get_cred(current->real_cred)); new = prepare_creds(); if (!new) return -ENOMEM; new->fsuid = rqstp->rq_cred.cr_uid; new->fsgid = rqstp->rq_cred.cr_gid; rqgi = rqstp->rq_cred.cr_group_info; if (flags & NFSEXP_ALLSQUASH) { new->fsuid = exp->ex_anon_uid; new->fsgid = exp->ex_anon_gid; gi = groups_alloc(0); if (!gi) goto oom; } else if (flags & NFSEXP_ROOTSQUASH) { if (!new->fsuid) new->fsuid = exp->ex_anon_uid; if (!new->fsgid) new->fsgid = exp->ex_anon_gid; gi = groups_alloc(rqgi->ngroups); if (!gi) goto oom; for (i = 0; i < rqgi->ngroups; i++) { if (!GROUP_AT(rqgi, i)) GROUP_AT(gi, i) = exp->ex_anon_gid; else GROUP_AT(gi, i) = GROUP_AT(rqgi, i); } } else { gi = get_group_info(rqgi); } if (new->fsuid == (uid_t) -1) new->fsuid = exp->ex_anon_uid; if (new->fsgid == (gid_t) -1) new->fsgid = exp->ex_anon_gid; ret = set_groups(new, gi); put_group_info(gi); if (ret < 0) goto error; if (new->fsuid) new->cap_effective = cap_drop_nfsd_set(new->cap_effective); else new->cap_effective = cap_raise_nfsd_set(new->cap_effective, new->cap_permitted); validate_process_creds(); put_cred(override_creds(new)); put_cred(new); validate_process_creds(); return 0; oom: ret = -ENOMEM; error: abort_creds(new); return ret; }