// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */

#include <linux/sched.h>
#include "nfsd.h"
#include "export.h"
#include "auth.h"

int nfsexp_flags(struct svc_cred *cred, 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 == cred->cr_flavor)
			return f->flags;
	}
	return exp->ex_flags;

}

int nfsd_setuser(struct svc_cred *cred, struct svc_export *exp)
{
	struct group_info *rqgi;
	struct group_info *gi;
	struct cred *new;
	int i;
	int flags = nfsexp_flags(cred, exp);

	/* discard any old override before preparing the new set */
	put_cred(revert_creds(get_cred(current_real_cred())));
	new = prepare_creds();
	if (!new)
		return -ENOMEM;

	new->fsuid = cred->cr_uid;
	new->fsgid = cred->cr_gid;

	rqgi = 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 (uid_eq(new->fsuid, GLOBAL_ROOT_UID))
			new->fsuid = exp->ex_anon_uid;
		if (gid_eq(new->fsgid, GLOBAL_ROOT_GID))
			new->fsgid = exp->ex_anon_gid;

		gi = groups_alloc(rqgi->ngroups);
		if (!gi)
			goto oom;

		for (i = 0; i < rqgi->ngroups; i++) {
			if (gid_eq(GLOBAL_ROOT_GID, rqgi->gid[i]))
				gi->gid[i] = exp->ex_anon_gid;
			else
				gi->gid[i] = rqgi->gid[i];
		}

		/* Each thread allocates its own gi, no race */
		groups_sort(gi);
	} else {
		gi = get_group_info(rqgi);
	}

	if (uid_eq(new->fsuid, INVALID_UID))
		new->fsuid = exp->ex_anon_uid;
	if (gid_eq(new->fsgid, INVALID_GID))
		new->fsgid = exp->ex_anon_gid;

	set_groups(new, gi);
	put_group_info(gi);

	if (!uid_eq(new->fsuid, GLOBAL_ROOT_UID))
		new->cap_effective = cap_drop_nfsd_set(new->cap_effective);
	else
		new->cap_effective = cap_raise_nfsd_set(new->cap_effective,
							new->cap_permitted);
	put_cred(override_creds(new));
	return 0;

oom:
	abort_creds(new);
	return -ENOMEM;
}

/**
 * nfsd_user_namespace - Get user_namespace in effect for an RPC request
 * @rqstp: RPC execution context
 *
 * xpt_cred is set once at transport creation and never modified. The
 * transport itself is reference-counted during request processing, so
 * no explicit reference on the namespace is necessary.
 *
 * Return: the user_namespace from the transport credential, or
 * init_user_ns if no credential was set. The returned namespace pointer
 * is valid for the duration of the RPC request.
 */
struct user_namespace *nfsd_user_namespace(const struct svc_rqst *rqstp)
{
	const struct cred *cred = rqstp->rq_xprt->xpt_cred;

	return cred ? cred->user_ns : &init_user_ns;
}