xref: /linux/security/landlock/log.h (revision 67f8bc848ee31831336bd478e57d2f993551902e)

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Landlock - Log helpers
 *
 * Copyright © 2023-2025 Microsoft Corporation
 * Copyright © 2026 Cloudflare, Inc.
 */

#ifndef _SECURITY_LANDLOCK_LOG_H
#define _SECURITY_LANDLOCK_LOG_H

#include <linux/lsm_audit.h>

#include "access.h"

struct landlock_cred_security;
struct landlock_hierarchy;

enum landlock_request_type {
	LANDLOCK_REQUEST_PTRACE = 1,
	LANDLOCK_REQUEST_FS_CHANGE_TOPOLOGY,
	LANDLOCK_REQUEST_FS_ACCESS,
	LANDLOCK_REQUEST_NET_ACCESS,
	LANDLOCK_REQUEST_SCOPE_ABSTRACT_UNIX_SOCKET,
	LANDLOCK_REQUEST_SCOPE_SIGNAL,
};

/*
 * We should be careful to only use a variable of this type for
 * landlock_log_denial().  This way, the compiler can remove it entirely if
 * CONFIG_SECURITY_LANDLOCK_LOG is not set.
 */
struct landlock_request {
	/* Mandatory fields. */
	enum landlock_request_type type;
	struct common_audit_data audit;

	/**
	 * layer_plus_one: First layer level that denies the request + 1.  The
	 * extra one is useful to detect uninitialized field.
	 */
	size_t layer_plus_one;

	/* Required field for configurable access control. */
	access_mask_t access;

	/* Required fields for requests with layer masks. */
	const struct layer_masks *layer_masks;

	/* Required fields for requests with deny masks. */
	const access_mask_t all_existing_optional_access;
	deny_masks_t deny_masks;
	optional_access_t quiet_optional_accesses;

	/*
	 * Other-party domain ID for a relational (scope/ptrace) denial, or 0 if
	 * that party is unsandboxed.  An ID, not a pointer: the other task can
	 * replace its credential and free the domain it referenced.  Trace path
	 * only; audit ignores it.
	 */
	u64 other_domain_id;
};

#ifdef CONFIG_SECURITY_LANDLOCK_LOG

void landlock_log_free_domain(const struct landlock_hierarchy *const hierarchy);

void landlock_log_denial(const struct landlock_cred_security *const subject,
			 const struct landlock_request *const request);

#else /* CONFIG_SECURITY_LANDLOCK_LOG */

static inline void
landlock_log_free_domain(const struct landlock_hierarchy *const hierarchy)
{
}

static inline void
landlock_log_denial(const struct landlock_cred_security *const subject,
		    const struct landlock_request *const request)
{
}

#endif /* CONFIG_SECURITY_LANDLOCK_LOG */

#endif /* _SECURITY_LANDLOCK_LOG_H */