| 1 | |
| 2 | * Capabilities Linux Security Module
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| 3 | *
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| 4 | * This program is free software; you can redistribute it and/or modify
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| 5 | * it under the terms of the GNU General Public License as published by
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| 6 | * the Free Software Foundation; either version 2 of the License, or
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| 7 | * (at your option) any later version.
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| 8 | *
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| 9 |
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| 10 |
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| 11 | #include <linux/module.h>
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| 12 | #include <linux/init.h>
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| 13 | #include <linux/kernel.h>
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| 14 | #include <linux/security.h>
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| 15 | #include <linux/file.h>
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| 16 | #include <linux/mm.h>
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| 17 | #include <linux/mman.h>
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| 18 | #include <linux/pagemap.h>
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| 19 | #include <linux/swap.h>
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| 20 | #include <linux/smp_lock.h>
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| 21 | #include <linux/skbuff.h>
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| 22 | #include <linux/netlink.h>
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| 23 | #include <linux/ptrace.h>
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| 24 | #include <linux/moduleparam.h>
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| 25 |
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| 26 | static struct security_operations capability_ops = {
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| 27 | .ptrace = cap_ptrace,
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| 28 | .capget = cap_capget,
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| 29 | .capset_check = cap_capset_check,
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| 30 | .capset_set = cap_capset_set,
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| 31 | .capable = cap_capable,
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| 32 | .settime = cap_settime,
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| 33 | .netlink_send = cap_netlink_send,
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| 34 | .netlink_recv = cap_netlink_recv,
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| 35 |
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| 36 | .bprm_apply_creds = cap_bprm_apply_creds,
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| 37 | .bprm_set_security = cap_bprm_set_security,
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| 38 | .bprm_secureexec = cap_bprm_secureexec,
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| 39 |
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| 40 | .inode_setxattr = cap_inode_setxattr,
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| 41 | .inode_removexattr = cap_inode_removexattr,
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| 42 |
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| 43 | .task_post_setuid = cap_task_post_setuid,
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| 44 | .task_reparent_to_init = cap_task_reparent_to_init,
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| 45 |
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| 46 | .syslog = cap_syslog,
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| 47 |
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| 48 | .vm_enough_memory = cap_vm_enough_memory,
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| 49 | };
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| 50 |
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| 51 |
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| 52 | static int secondary;
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| 53 |
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| 54 | static int capability_disable;
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| 55 | module_param_named(disable, capability_disable, int, 0);
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| 56 | MODULE_PARM_DESC(disable, "To disable capabilities module set disable = 1");
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| 57 |
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| 58 | static int __init capability_init (void)
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| 59 | {
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| 60 | if (capability_disable) {
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| 61 | printk(KERN_INFO "Capabilities disabled at initialization\n");
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| 62 | return 0;
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| 63 | }
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| 64 |
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| 65 | if (register_security (&capability_ops)) {
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| 66 |
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| 67 | if (mod_reg_security (KBUILD_MODNAME, &capability_ops)) {
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| 68 | printk (KERN_INFO "Failure registering capabilities "
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| 69 | "with primary security module.\n");
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| 70 | return -EINVAL;
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| 71 | }
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| 72 | secondary = 1;
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| 73 | }
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| 74 | printk (KERN_INFO "Capability LSM initialized%s\n",
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| 75 | secondary ? " as secondary" : "");
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| 76 | return 0;
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| 77 | }
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| 78 |
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| 79 | static void __exit capability_exit (void)
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| 80 | {
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| 81 | if (capability_disable)
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| 82 | return;
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| 83 |
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| 84 | if (secondary) {
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| 85 | if (mod_unreg_security (KBUILD_MODNAME, &capability_ops))
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| 86 | printk (KERN_INFO "Failure unregistering capabilities "
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| 87 | "with primary module.\n");
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| 88 | return;
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| 89 | }
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| 90 |
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| 91 | if (unregister_security (&capability_ops)) {
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| 92 | printk (KERN_INFO
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| 93 | "Failure unregistering capabilities with the kernel\n");
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| 94 | }
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| 95 | }
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| 96 |
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| 97 | security_initcall (capability_init);
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| 98 | module_exit (capability_exit);
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| 99 |
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| 100 | MODULE_DESCRIPTION("Standard Linux Capabilities Security Module");
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| 101 | MODULE_LICENSE("GPL");
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