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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");