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1 | /* |
2 | * AppArmor security module |
3 | * |
4 | * This file contains AppArmor ipc mediation |
5 | * |
6 | * Copyright (C) 1998-2008 Novell/SUSE |
7 | * Copyright 2009-2010 Canonical Ltd. |
8 | * |
9 | * This program is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public License as |
11 | * published by the Free Software Foundation, version 2 of the |
12 | * License. |
13 | */ |
14 | |
15 | #include <linux/gfp.h> |
16 | #include <linux/ptrace.h> |
17 | |
18 | #include "include/audit.h" |
19 | #include "include/capability.h" |
20 | #include "include/context.h" |
21 | #include "include/policy.h" |
22 | #include "include/ipc.h" |
23 | |
24 | /* call back to audit ptrace fields */ |
25 | static void audit_cb(struct audit_buffer *ab, void *va) |
26 | { |
27 | struct common_audit_data *sa = va; |
28 | audit_log_format(ab, " target="); |
29 | audit_log_untrustedstring(ab, sa->aad->target); |
30 | } |
31 | |
32 | /** |
33 | * aa_audit_ptrace - do auditing for ptrace |
34 | * @profile: profile being enforced (NOT NULL) |
35 | * @target: profile being traced (NOT NULL) |
36 | * @error: error condition |
37 | * |
38 | * Returns: %0 or error code |
39 | */ |
40 | static int aa_audit_ptrace(struct aa_profile *profile, |
41 | struct aa_profile *target, int error) |
42 | { |
43 | struct common_audit_data sa; |
44 | struct apparmor_audit_data aad = {0,}; |
45 | COMMON_AUDIT_DATA_INIT(&sa, NONE); |
46 | sa.aad = &aad; |
47 | aad.op = OP_PTRACE; |
48 | aad.target = target; |
49 | aad.error = error; |
50 | |
51 | return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_ATOMIC, &sa, |
52 | audit_cb); |
53 | } |
54 | |
55 | /** |
56 | * aa_may_ptrace - test if tracer task can trace the tracee |
57 | * @tracer_task: task who will do the tracing (NOT NULL) |
58 | * @tracer: profile of the task doing the tracing (NOT NULL) |
59 | * @tracee: task to be traced |
60 | * @mode: whether PTRACE_MODE_READ || PTRACE_MODE_ATTACH |
61 | * |
62 | * Returns: %0 else error code if permission denied or error |
63 | */ |
64 | int aa_may_ptrace(struct task_struct *tracer_task, struct aa_profile *tracer, |
65 | struct aa_profile *tracee, unsigned int mode) |
66 | { |
67 | /* TODO: currently only based on capability, not extended ptrace |
68 | * rules, |
69 | * Test mode for PTRACE_MODE_READ || PTRACE_MODE_ATTACH |
70 | */ |
71 | |
72 | if (unconfined(tracer) || tracer == tracee) |
73 | return 0; |
74 | /* log this capability request */ |
75 | return aa_capable(tracer_task, tracer, CAP_SYS_PTRACE, 1); |
76 | } |
77 | |
78 | /** |
79 | * aa_ptrace - do ptrace permission check and auditing |
80 | * @tracer: task doing the tracing (NOT NULL) |
81 | * @tracee: task being traced (NOT NULL) |
82 | * @mode: ptrace mode either PTRACE_MODE_READ || PTRACE_MODE_ATTACH |
83 | * |
84 | * Returns: %0 else error code if permission denied or error |
85 | */ |
86 | int aa_ptrace(struct task_struct *tracer, struct task_struct *tracee, |
87 | unsigned int mode) |
88 | { |
89 | /* |
90 | * tracer can ptrace tracee when |
91 | * - tracer is unconfined || |
92 | * - tracer is in complain mode |
93 | * - tracer has rules allowing it to trace tracee currently this is: |
94 | * - confined by the same profile || |
95 | * - tracer profile has CAP_SYS_PTRACE |
96 | */ |
97 | |
98 | struct aa_profile *tracer_p; |
99 | /* cred released below */ |
100 | const struct cred *cred = get_task_cred(tracer); |
101 | int error = 0; |
102 | tracer_p = aa_cred_profile(cred); |
103 | |
104 | if (!unconfined(tracer_p)) { |
105 | /* lcred released below */ |
106 | const struct cred *lcred = get_task_cred(tracee); |
107 | struct aa_profile *tracee_p = aa_cred_profile(lcred); |
108 | |
109 | error = aa_may_ptrace(tracer, tracer_p, tracee_p, mode); |
110 | error = aa_audit_ptrace(tracer_p, tracee_p, error); |
111 | |
112 | put_cred(lcred); |
113 | } |
114 | put_cred(cred); |
115 | |
116 | return error; |
117 | } |
118 |
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