capability.c
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/*
* 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/config.h>
#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");