root/fs/nfsd/auth.c

DEFINITIONS

1. nfsexp_flags
2. nfsd_setuser

/*
 * linux/fs/nfsd/auth.c
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/export.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 svc_cred cred = rqstp->rq_cred;
        int i;
        int flags = nfsexp_flags(rqstp, exp);
        int ret;

        if (flags & NFSEXP_ALLSQUASH) {
                cred.cr_uid = exp->ex_anon_uid;
                cred.cr_gid = exp->ex_anon_gid;
                cred.cr_group_info = groups_alloc(0);
        } else if (flags & NFSEXP_ROOTSQUASH) {
                struct group_info *gi;
                if (!cred.cr_uid)
                        cred.cr_uid = exp->ex_anon_uid;
                if (!cred.cr_gid)
                        cred.cr_gid = exp->ex_anon_gid;
                gi = groups_alloc(cred.cr_group_info->ngroups);
                if (gi)
                        for (i = 0; i < cred.cr_group_info->ngroups; i++) {
                                if (!GROUP_AT(cred.cr_group_info, i))
                                        GROUP_AT(gi, i) = exp->ex_anon_gid;
                                else
                                        GROUP_AT(gi, i) = GROUP_AT(cred.cr_group_info, i);
                        }
                cred.cr_group_info = gi;
        } else
                get_group_info(cred.cr_group_info);

        if (cred.cr_uid != (uid_t) -1)
                current->fsuid = cred.cr_uid;
        else
                current->fsuid = exp->ex_anon_uid;
        if (cred.cr_gid != (gid_t) -1)
                current->fsgid = cred.cr_gid;
        else
                current->fsgid = exp->ex_anon_gid;

        if (!cred.cr_group_info)
                return -ENOMEM;
        ret = set_current_groups(cred.cr_group_info);
        put_group_info(cred.cr_group_info);
        if ((cred.cr_uid)) {
                current->cap_effective =
                        cap_drop_nfsd_set(current->cap_effective);
        } else {
                current->cap_effective =
                        cap_raise_nfsd_set(current->cap_effective,
                                           current->cap_permitted);
        }
        return ret;
}