[thirdparty/kernel/stable.git] / security / tomoyo / load_policy.c

// SPDX-License-Identifier: GPL-2.0
/*
 * security/tomoyo/load_policy.c
 *
 * Copyright (C) 2005-2011  NTT DATA CORPORATION
 */

#include "common.h"

#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER

/*
 * Path to the policy loader. (default = CONFIG_SECURITY_TOMOYO_POLICY_LOADER)
 */
static const char *tomoyo_loader;

/**
 * tomoyo_loader_setup - Set policy loader.
 *
 * @str: Program to use as a policy loader (e.g. /sbin/tomoyo-init ).
 *
 * Returns 0.
 */
static int __init tomoyo_loader_setup(char *str)
{
	tomoyo_loader = str;
	return 0;
}

__setup("TOMOYO_loader=", tomoyo_loader_setup);

/**
 * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
 *
 * Returns true if /sbin/tomoyo-init exists, false otherwise.
 */
static bool tomoyo_policy_loader_exists(void)
{
	struct path path;

	if (!tomoyo_loader)
		tomoyo_loader = CONFIG_SECURITY_TOMOYO_POLICY_LOADER;
	if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
		pr_info("Not activating Mandatory Access Control as %s does not exist.\n",
			tomoyo_loader);
		return false;
	}
	path_put(&path);
	return true;
}

/*
 * Path to the trigger. (default = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER)
 */
static const char *tomoyo_trigger;

/**
 * tomoyo_trigger_setup - Set trigger for activation.
 *
 * @str: Program to use as an activation trigger (e.g. /sbin/init ).
 *
 * Returns 0.
 */
static int __init tomoyo_trigger_setup(char *str)
{
	tomoyo_trigger = str;
	return 0;
}

__setup("TOMOYO_trigger=", tomoyo_trigger_setup);

/**
 * tomoyo_load_policy - Run external policy loader to load policy.
 *
 * @filename: The program about to start.
 *
 * This function checks whether @filename is /sbin/init , and if so
 * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
 * and then continues invocation of /sbin/init.
 * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
 * writes to /sys/kernel/security/tomoyo/ interfaces.
 *
 * Returns nothing.
 */
void tomoyo_load_policy(const char *filename)
{
	static bool done;
	char *argv[2];
	char *envp[3];

	if (tomoyo_policy_loaded || done)
		return;
	if (!tomoyo_trigger)
		tomoyo_trigger = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER;
	if (strcmp(filename, tomoyo_trigger))
		return;
	if (!tomoyo_policy_loader_exists())
		return;
	done = true;
	pr_info("Calling %s to load policy. Please wait.\n", tomoyo_loader);
	argv[0] = (char *) tomoyo_loader;
	argv[1] = NULL;
	envp[0] = "HOME=/";
	envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
	envp[2] = NULL;
	call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
	tomoyo_check_profile();
}

#endif
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
c3ef1500 TH	2	/*
	3	* security/tomoyo/load_policy.c
	4	*
0f2a55d5	5	* Copyright (C) 2005-2011 NTT DATA CORPORATION
c3ef1500 TH	6	*/
	7
	8	#include "common.h"
	9
0e4ae0e0 TH	10	#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
	11
	12	/*
	13	* Path to the policy loader. (default = CONFIG_SECURITY_TOMOYO_POLICY_LOADER)
	14	*/
	15	static const char *tomoyo_loader;
	16
	17	/**
	18	* tomoyo_loader_setup - Set policy loader.
	19	*
	20	* @str: Program to use as a policy loader (e.g. /sbin/tomoyo-init ).
	21	*
	22	* Returns 0.
	23	*/
	24	static int __init tomoyo_loader_setup(char *str)
	25	{
	26	tomoyo_loader = str;
	27	return 0;
	28	}
	29
	30	__setup("TOMOYO_loader=", tomoyo_loader_setup);
c3ef1500 TH	31
	32	/**
	33	* tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
	34	*
	35	* Returns true if /sbin/tomoyo-init exists, false otherwise.
	36	*/
	37	static bool tomoyo_policy_loader_exists(void)
	38	{
c3ef1500	39	struct path path;
cdcf6723	40
0e4ae0e0 TH	41	if (!tomoyo_loader)
0e4ae0e0 TH	42	tomoyo_loader = CONFIG_SECURITY_TOMOYO_POLICY_LOADER;
c3ef1500	43	if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
cdcf6723 TH	44	pr_info("Not activating Mandatory Access Control as %s does not exist.\n",
cdcf6723 TH	45	tomoyo_loader);
c3ef1500 TH	46	return false;
	47	}
	48	path_put(&path);
	49	return true;
	50	}
	51
0e4ae0e0 TH	52	/*
	53	* Path to the trigger. (default = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER)
	54	*/
	55	static const char *tomoyo_trigger;
	56
	57	/**
	58	* tomoyo_trigger_setup - Set trigger for activation.
	59	*
	60	* @str: Program to use as an activation trigger (e.g. /sbin/init ).
	61	*
	62	* Returns 0.
	63	*/
	64	static int __init tomoyo_trigger_setup(char *str)
	65	{
	66	tomoyo_trigger = str;
	67	return 0;
	68	}
	69
	70	__setup("TOMOYO_trigger=", tomoyo_trigger_setup);
	71
c3ef1500 TH	72	/**
	73	* tomoyo_load_policy - Run external policy loader to load policy.
	74	*
	75	* @filename: The program about to start.
	76	*
	77	* This function checks whether @filename is /sbin/init , and if so
	78	* invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
	79	* and then continues invocation of /sbin/init.
	80	* /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
	81	* writes to /sys/kernel/security/tomoyo/ interfaces.
	82	*
	83	* Returns nothing.
	84	*/
	85	void tomoyo_load_policy(const char *filename)
	86	{
0e4ae0e0	87	static bool done;
c3ef1500 TH	88	char *argv[2];
	89	char *envp[3];
	90
0e4ae0e0	91	if (tomoyo_policy_loaded \|\| done)
c3ef1500	92	return;
0e4ae0e0 TH	93	if (!tomoyo_trigger)
	94	tomoyo_trigger = CONFIG_SECURITY_TOMOYO_ACTIVATION_TRIGGER;
	95	if (strcmp(filename, tomoyo_trigger))
c3ef1500 TH	96	return;
	97	if (!tomoyo_policy_loader_exists())
	98	return;
0e4ae0e0	99	done = true;
cdcf6723	100	pr_info("Calling %s to load policy. Please wait.\n", tomoyo_loader);
c3ef1500 TH	101	argv[0] = (char *) tomoyo_loader;
	102	argv[1] = NULL;
	103	envp[0] = "HOME=/";
	104	envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
	105	envp[2] = NULL;
70834d30	106	call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
c3ef1500 TH	107	tomoyo_check_profile();
c3ef1500 TH	108	}
0e4ae0e0 TH	109
0e4ae0e0 TH	110	#endif