[linux-block.git] / security / capability.c

/*
 *  Capabilities Linux Security Module
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/security.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/smp_lock.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/ptrace.h>
#include <linux/moduleparam.h>

static struct security_operations capability_ops = {
	.ptrace =			cap_ptrace,
	.capget =			cap_capget,
	.capset_check =			cap_capset_check,
	.capset_set =			cap_capset_set,
	.capable =			cap_capable,
	.settime =			cap_settime,
	.netlink_send =			cap_netlink_send,
	.netlink_recv =			cap_netlink_recv,

	.bprm_apply_creds =		cap_bprm_apply_creds,
	.bprm_set_security =		cap_bprm_set_security,
	.bprm_secureexec =		cap_bprm_secureexec,

	.inode_setxattr =		cap_inode_setxattr,
	.inode_removexattr =		cap_inode_removexattr,

	.task_post_setuid =		cap_task_post_setuid,
	.task_reparent_to_init =	cap_task_reparent_to_init,

	.syslog =                       cap_syslog,

	.vm_enough_memory =             cap_vm_enough_memory,
};

/* flag to keep track of how we were registered */
static int secondary;

static int capability_disable;
module_param_named(disable, capability_disable, int, 0);
MODULE_PARM_DESC(disable, "To disable capabilities module set disable = 1");

static int __init capability_init (void)
{
	if (capability_disable) {
		printk(KERN_INFO "Capabilities disabled at initialization\n");
		return 0;
	}
	/* register ourselves with the security framework */
	if (register_security (&capability_ops)) {
		/* try registering with primary module */
		if (mod_reg_security (KBUILD_MODNAME, &capability_ops)) {
			printk (KERN_INFO "Failure registering capabilities "
				"with primary security module.\n");
			return -EINVAL;
		}
		secondary = 1;
	}
	printk (KERN_INFO "Capability LSM initialized%s\n",
		secondary ? " as secondary" : "");
	return 0;
}

static void __exit capability_exit (void)
{
	if (capability_disable)
		return;
	/* remove ourselves from the security framework */
	if (secondary) {
		if (mod_unreg_security (KBUILD_MODNAME, &capability_ops))
			printk (KERN_INFO "Failure unregistering capabilities "
				"with primary module.\n");
		return;
	}

	if (unregister_security (&capability_ops)) {
		printk (KERN_INFO
			"Failure unregistering capabilities with the kernel\n");
	}
}

security_initcall (capability_init);
module_exit (capability_exit);

MODULE_DESCRIPTION("Standard Linux Capabilities Security Module");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Capabilities Linux Security Module
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	*/
	10
1da177e4 LT	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/security.h>
	15	#include <linux/file.h>
	16	#include <linux/mm.h>
	17	#include <linux/mman.h>
	18	#include <linux/pagemap.h>
	19	#include <linux/swap.h>
	20	#include <linux/smp_lock.h>
	21	#include <linux/skbuff.h>
	22	#include <linux/netlink.h>
	23	#include <linux/ptrace.h>
	24	#include <linux/moduleparam.h>
	25
	26	static struct security_operations capability_ops = {
	27	.ptrace = cap_ptrace,
	28	.capget = cap_capget,
	29	.capset_check = cap_capset_check,
	30	.capset_set = cap_capset_set,
	31	.capable = cap_capable,
	32	.settime = cap_settime,
	33	.netlink_send = cap_netlink_send,
	34	.netlink_recv = cap_netlink_recv,
	35
	36	.bprm_apply_creds = cap_bprm_apply_creds,
	37	.bprm_set_security = cap_bprm_set_security,
	38	.bprm_secureexec = cap_bprm_secureexec,
	39
	40	.inode_setxattr = cap_inode_setxattr,
	41	.inode_removexattr = cap_inode_removexattr,
	42
	43	.task_post_setuid = cap_task_post_setuid,
	44	.task_reparent_to_init = cap_task_reparent_to_init,
	45
	46	.syslog = cap_syslog,
	47
	48	.vm_enough_memory = cap_vm_enough_memory,
	49	};
	50
1da177e4 LT	51	/* flag to keep track of how we were registered */
	52	static int secondary;
	53
	54	static int capability_disable;
	55	module_param_named(disable, capability_disable, int, 0);
	56	MODULE_PARM_DESC(disable, "To disable capabilities module set disable = 1");
	57
	58	static int __init capability_init (void)
	59	{
	60	if (capability_disable) {
	61	printk(KERN_INFO "Capabilities disabled at initialization\n");
	62	return 0;
	63	}
	64	/* register ourselves with the security framework */
	65	if (register_security (&capability_ops)) {
	66	/* try registering with primary module */
367cb704	67	if (mod_reg_security (KBUILD_MODNAME, &capability_ops)) {
1da177e4 LT	68	printk (KERN_INFO "Failure registering capabilities "
	69	"with primary security module.\n");
	70	return -EINVAL;
	71	}
	72	secondary = 1;
	73	}
	74	printk (KERN_INFO "Capability LSM initialized%s\n",
	75	secondary ? " as secondary" : "");
	76	return 0;
	77	}
	78
	79	static void __exit capability_exit (void)
	80	{
	81	if (capability_disable)
	82	return;
	83	/* remove ourselves from the security framework */
	84	if (secondary) {
367cb704	85	if (mod_unreg_security (KBUILD_MODNAME, &capability_ops))
1da177e4 LT	86	printk (KERN_INFO "Failure unregistering capabilities "
	87	"with primary module.\n");
	88	return;
	89	}
	90
	91	if (unregister_security (&capability_ops)) {
	92	printk (KERN_INFO
	93	"Failure unregistering capabilities with the kernel\n");
	94	}
	95	}
	96
	97	security_initcall (capability_init);
	98	module_exit (capability_exit);
	99
	100	MODULE_DESCRIPTION("Standard Linux Capabilities Security Module");
	101	MODULE_LICENSE("GPL");