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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> | |
1da177e4 LT |
20 | #include <linux/skbuff.h> |
21 | #include <linux/netlink.h> | |
22 | #include <linux/ptrace.h> | |
23 | #include <linux/moduleparam.h> | |
24 | ||
25 | static struct security_operations capability_ops = { | |
26 | .ptrace = cap_ptrace, | |
27 | .capget = cap_capget, | |
28 | .capset_check = cap_capset_check, | |
29 | .capset_set = cap_capset_set, | |
30 | .capable = cap_capable, | |
31 | .settime = cap_settime, | |
32 | .netlink_send = cap_netlink_send, | |
33 | .netlink_recv = cap_netlink_recv, | |
34 | ||
35 | .bprm_apply_creds = cap_bprm_apply_creds, | |
36 | .bprm_set_security = cap_bprm_set_security, | |
37 | .bprm_secureexec = cap_bprm_secureexec, | |
38 | ||
39 | .inode_setxattr = cap_inode_setxattr, | |
40 | .inode_removexattr = cap_inode_removexattr, | |
41 | ||
42 | .task_post_setuid = cap_task_post_setuid, | |
43 | .task_reparent_to_init = cap_task_reparent_to_init, | |
44 | ||
45 | .syslog = cap_syslog, | |
46 | ||
47 | .vm_enough_memory = cap_vm_enough_memory, | |
48 | }; | |
49 | ||
1da177e4 LT |
50 | /* flag to keep track of how we were registered */ |
51 | static int secondary; | |
52 | ||
53 | static int capability_disable; | |
54 | module_param_named(disable, capability_disable, int, 0); | |
55 | MODULE_PARM_DESC(disable, "To disable capabilities module set disable = 1"); | |
56 | ||
57 | static int __init capability_init (void) | |
58 | { | |
59 | if (capability_disable) { | |
60 | printk(KERN_INFO "Capabilities disabled at initialization\n"); | |
61 | return 0; | |
62 | } | |
63 | /* register ourselves with the security framework */ | |
64 | if (register_security (&capability_ops)) { | |
65 | /* try registering with primary module */ | |
367cb704 | 66 | if (mod_reg_security (KBUILD_MODNAME, &capability_ops)) { |
1da177e4 LT |
67 | printk (KERN_INFO "Failure registering capabilities " |
68 | "with primary security module.\n"); | |
69 | return -EINVAL; | |
70 | } | |
71 | secondary = 1; | |
72 | } | |
73 | printk (KERN_INFO "Capability LSM initialized%s\n", | |
74 | secondary ? " as secondary" : ""); | |
75 | return 0; | |
76 | } | |
77 | ||
78 | static void __exit capability_exit (void) | |
79 | { | |
80 | if (capability_disable) | |
81 | return; | |
82 | /* remove ourselves from the security framework */ | |
83 | if (secondary) { | |
367cb704 | 84 | if (mod_unreg_security (KBUILD_MODNAME, &capability_ops)) |
1da177e4 LT |
85 | printk (KERN_INFO "Failure unregistering capabilities " |
86 | "with primary module.\n"); | |
87 | return; | |
88 | } | |
89 | ||
90 | if (unregister_security (&capability_ops)) { | |
91 | printk (KERN_INFO | |
92 | "Failure unregistering capabilities with the kernel\n"); | |
93 | } | |
94 | } | |
95 | ||
96 | security_initcall (capability_init); | |
97 | module_exit (capability_exit); | |
98 | ||
99 | MODULE_DESCRIPTION("Standard Linux Capabilities Security Module"); | |
100 | MODULE_LICENSE("GPL"); |