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0ed3b28a JJ |
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" | |
33f8bf58 | 22 | #include "include/ipc.h" |
0ed3b28a JJ |
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="); | |
3b3b0e4f | 29 | audit_log_untrustedstring(ab, sa->aad->target); |
0ed3b28a JJ |
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; | |
3b3b0e4f | 44 | struct apparmor_audit_data aad = {0,}; |
50c205f5 | 45 | sa.type = LSM_AUDIT_DATA_NONE; |
3b3b0e4f EP |
46 | sa.aad = &aad; |
47 | aad.op = OP_PTRACE; | |
48 | aad.target = target; | |
49 | aad.error = error; | |
0ed3b28a JJ |
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 */ | |
77c80e6b | 106 | const struct cred *lcred = get_task_cred(tracee); |
0ed3b28a JJ |
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 | } |