LXR linux/security/capability.c

   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
  11#include <linux/init.h>
  12#include <linux/kernel.h>
  13#include <linux/security.h>
  14#include <linux/file.h>
  15#include <linux/mm.h>
  16#include <linux/mman.h>
  17#include <linux/pagemap.h>
  18#include <linux/swap.h>
  19#include <linux/skbuff.h>
  20#include <linux/netlink.h>
  21#include <linux/ptrace.h>
  22#include <linux/moduleparam.h>
  23
  24static struct security_operations capability_ops = {
  25        .ptrace =                       cap_ptrace,
  26        .capget =                       cap_capget,
  27        .capset_check =                 cap_capset_check,
  28        .capset_set =                   cap_capset_set,
  29        .capable =                      cap_capable,
  30        .settime =                      cap_settime,
  31        .netlink_send =                 cap_netlink_send,
  32        .netlink_recv =                 cap_netlink_recv,
  33
  34        .bprm_apply_creds =             cap_bprm_apply_creds,
  35        .bprm_set_security =            cap_bprm_set_security,
  36        .bprm_secureexec =              cap_bprm_secureexec,
  37
  38        .inode_setxattr =               cap_inode_setxattr,
  39        .inode_removexattr =            cap_inode_removexattr,
  40        .inode_need_killpriv =          cap_inode_need_killpriv,
  41        .inode_killpriv =               cap_inode_killpriv,
  42
  43        .task_kill =                    cap_task_kill,
  44        .task_setscheduler =            cap_task_setscheduler,
  45        .task_setioprio =               cap_task_setioprio,
  46        .task_setnice =                 cap_task_setnice,
  47        .task_post_setuid =             cap_task_post_setuid,
  48        .task_reparent_to_init =        cap_task_reparent_to_init,
  49
  50        .syslog =                       cap_syslog,
  51
  52        .vm_enough_memory =             cap_vm_enough_memory,
  53};
  54
  55/* flag to keep track of how we were registered */
  56static int secondary;
  57
  58static int capability_disable;
  59module_param_named(disable, capability_disable, int, 0);
  60
  61static int __init capability_init (void)
  62{
  63        if (capability_disable) {
  64                printk(KERN_INFO "Capabilities disabled at initialization\n");
  65                return 0;
  66        }
  67        /* register ourselves with the security framework */
  68        if (register_security (&capability_ops)) {
  69                /* try registering with primary module */
  70                if (mod_reg_security (KBUILD_MODNAME, &capability_ops)) {
  71                        printk (KERN_INFO "Failure registering capabilities "
  72                                "with primary security module.\n");
  73                        return -EINVAL;
  74                }
  75                secondary = 1;
  76        }
  77        printk (KERN_INFO "Capability LSM initialized%s\n",
  78                secondary ? " as secondary" : "");
  79        return 0;
  80}
  81
  82security_initcall (capability_init);
  83