/* * 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/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");