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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 */
25static 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 */
40static 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 sa.type = LSM_AUDIT_DATA_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: profile of the task doing the tracing (NOT NULL)
58 * @tracee: task to be traced
59 * @mode: whether PTRACE_MODE_READ || PTRACE_MODE_ATTACH
60 *
61 * Returns: %0 else error code if permission denied or error
62 */
63int aa_may_ptrace(struct aa_profile *tracer, struct aa_profile *tracee,
64 unsigned int mode)
65{
66 /* TODO: currently only based on capability, not extended ptrace
67 * rules,
68 * Test mode for PTRACE_MODE_READ || PTRACE_MODE_ATTACH
69 */
70
71 if (unconfined(tracer) || tracer == tracee)
72 return 0;
73 /* log this capability request */
74 return aa_capable(tracer, CAP_SYS_PTRACE, 1);
75}
76
77/**
78 * aa_ptrace - do ptrace permission check and auditing
79 * @tracer: task doing the tracing (NOT NULL)
80 * @tracee: task being traced (NOT NULL)
81 * @mode: ptrace mode either PTRACE_MODE_READ || PTRACE_MODE_ATTACH
82 *
83 * Returns: %0 else error code if permission denied or error
84 */
85int aa_ptrace(struct task_struct *tracer, struct task_struct *tracee,
86 unsigned int mode)
87{
88 /*
89 * tracer can ptrace tracee when
90 * - tracer is unconfined ||
91 * - tracer is in complain mode
92 * - tracer has rules allowing it to trace tracee currently this is:
93 * - confined by the same profile ||
94 * - tracer profile has CAP_SYS_PTRACE
95 */
96
97 struct aa_profile *tracer_p = aa_get_task_profile(tracer);
98 int error = 0;
99
100 if (!unconfined(tracer_p)) {
101 struct aa_profile *tracee_p = aa_get_task_profile(tracee);
102
103 error = aa_may_ptrace(tracer_p, tracee_p, mode);
104 error = aa_audit_ptrace(tracer_p, tracee_p, error);
105
106 aa_put_profile(tracee_p);
107 }
108 aa_put_profile(tracer_p);
109
110 return error;
111}
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 */
25static 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 */
40static 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 sa.type = LSM_AUDIT_DATA_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 */
64int 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 */
86int 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}