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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 | |
23 | /* call back to audit ptrace fields */ |
24 | static void audit_cb(struct audit_buffer *ab, void *va) |
25 | { |
26 | struct common_audit_data *sa = va; |
27 | audit_log_format(ab, " target="); |
28 | audit_log_untrustedstring(ab, sa->aad.target); |
29 | } |
30 | |
31 | /** |
32 | * aa_audit_ptrace - do auditing for ptrace |
33 | * @profile: profile being enforced (NOT NULL) |
34 | * @target: profile being traced (NOT NULL) |
35 | * @error: error condition |
36 | * |
37 | * Returns: %0 or error code |
38 | */ |
39 | static int aa_audit_ptrace(struct aa_profile *profile, |
40 | struct aa_profile *target, int error) |
41 | { |
42 | struct common_audit_data sa; |
43 | COMMON_AUDIT_DATA_INIT(&sa, NONE); |
44 | sa.aad.op = OP_PTRACE; |
45 | sa.aad.target = target; |
46 | sa.aad.error = error; |
47 | |
48 | return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_ATOMIC, &sa, |
49 | audit_cb); |
50 | } |
51 | |
52 | /** |
53 | * aa_may_ptrace - test if tracer task can trace the tracee |
54 | * @tracer_task: task who will do the tracing (NOT NULL) |
55 | * @tracer: profile of the task doing the tracing (NOT NULL) |
56 | * @tracee: task to be traced |
57 | * @mode: whether PTRACE_MODE_READ || PTRACE_MODE_ATTACH |
58 | * |
59 | * Returns: %0 else error code if permission denied or error |
60 | */ |
61 | int aa_may_ptrace(struct task_struct *tracer_task, struct aa_profile *tracer, |
62 | struct aa_profile *tracee, unsigned int mode) |
63 | { |
64 | /* TODO: currently only based on capability, not extended ptrace |
65 | * rules, |
66 | * Test mode for PTRACE_MODE_READ || PTRACE_MODE_ATTACH |
67 | */ |
68 | |
69 | if (unconfined(tracer) || tracer == tracee) |
70 | return 0; |
71 | /* log this capability request */ |
72 | return aa_capable(tracer_task, tracer, CAP_SYS_PTRACE, 1); |
73 | } |
74 | |
75 | /** |
76 | * aa_ptrace - do ptrace permission check and auditing |
77 | * @tracer: task doing the tracing (NOT NULL) |
78 | * @tracee: task being traced (NOT NULL) |
79 | * @mode: ptrace mode either PTRACE_MODE_READ || PTRACE_MODE_ATTACH |
80 | * |
81 | * Returns: %0 else error code if permission denied or error |
82 | */ |
83 | int aa_ptrace(struct task_struct *tracer, struct task_struct *tracee, |
84 | unsigned int mode) |
85 | { |
86 | /* |
87 | * tracer can ptrace tracee when |
88 | * - tracer is unconfined || |
89 | * - tracer is in complain mode |
90 | * - tracer has rules allowing it to trace tracee currently this is: |
91 | * - confined by the same profile || |
92 | * - tracer profile has CAP_SYS_PTRACE |
93 | */ |
94 | |
95 | struct aa_profile *tracer_p; |
96 | /* cred released below */ |
97 | const struct cred *cred = get_task_cred(tracer); |
98 | int error = 0; |
99 | tracer_p = aa_cred_profile(cred); |
100 | |
101 | if (!unconfined(tracer_p)) { |
102 | /* lcred released below */ |
103 | const struct cred *lcred = get_task_cred(tracee); |
104 | struct aa_profile *tracee_p = aa_cred_profile(lcred); |
105 | |
106 | error = aa_may_ptrace(tracer, tracer_p, tracee_p, mode); |
107 | error = aa_audit_ptrace(tracer_p, tracee_p, error); |
108 | |
109 | put_cred(lcred); |
110 | } |
111 | put_cred(cred); |
112 | |
113 | return error; |
114 | } |
115 |
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