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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 | ||
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"); |