| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/config.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/security.h> |
| 16 | #include <linux/file.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/mman.h> |
| 19 | #include <linux/pagemap.h> |
| 20 | #include <linux/swap.h> |
| 21 | #include <linux/smp_lock.h> |
| 22 | #include <linux/skbuff.h> |
| 23 | #include <linux/netlink.h> |
| 24 | #include <linux/ptrace.h> |
| 25 | #include <linux/moduleparam.h> |
| 26 | |
| 27 | static struct security_operations capability_ops = { |
| 28 | .ptrace = cap_ptrace, |
| 29 | .capget = cap_capget, |
| 30 | .capset_check = cap_capset_check, |
| 31 | .capset_set = cap_capset_set, |
| 32 | .capable = cap_capable, |
| 33 | .settime = cap_settime, |
| 34 | .netlink_send = cap_netlink_send, |
| 35 | .netlink_recv = cap_netlink_recv, |
| 36 | |
| 37 | .bprm_apply_creds = cap_bprm_apply_creds, |
| 38 | .bprm_set_security = cap_bprm_set_security, |
| 39 | .bprm_secureexec = cap_bprm_secureexec, |
| 40 | |
| 41 | .inode_setxattr = cap_inode_setxattr, |
| 42 | .inode_removexattr = cap_inode_removexattr, |
| 43 | |
| 44 | .task_post_setuid = cap_task_post_setuid, |
| 45 | .task_reparent_to_init = cap_task_reparent_to_init, |
| 46 | |
| 47 | .syslog = cap_syslog, |
| 48 | |
| 49 | .vm_enough_memory = cap_vm_enough_memory, |
| 50 | }; |
| 51 | |
| 52 | #define MY_NAME __stringify(KBUILD_MODNAME) |
| 53 | |
| 54 | /* flag to keep track of how we were registered */ |
| 55 | static int secondary; |
| 56 | |
| 57 | static int capability_disable; |
| 58 | module_param_named(disable, capability_disable, int, 0); |
| 59 | MODULE_PARM_DESC(disable, "To disable capabilities module set disable = 1"); |
| 60 | |
| 61 | static 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 (MY_NAME, &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 | |
| 82 | static void __exit capability_exit (void) |
| 83 | { |
| 84 | if (capability_disable) |
| 85 | return; |
| 86 | /* remove ourselves from the security framework */ |
| 87 | if (secondary) { |
| 88 | if (mod_unreg_security (MY_NAME, &capability_ops)) |
| 89 | printk (KERN_INFO "Failure unregistering capabilities " |
| 90 | "with primary module.\n"); |
| 91 | return; |
| 92 | } |
| 93 | |
| 94 | if (unregister_security (&capability_ops)) { |
| 95 | printk (KERN_INFO |
| 96 | "Failure unregistering capabilities with the kernel\n"); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | security_initcall (capability_init); |
| 101 | module_exit (capability_exit); |
| 102 | |
| 103 | MODULE_DESCRIPTION("Standard Linux Capabilities Security Module"); |
| 104 | MODULE_LICENSE("GPL"); |