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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor ipc mediation
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2017 Canonical Ltd.
9 */
10
11#include <linux/gfp.h>
12
13#include "include/audit.h"
14#include "include/capability.h"
15#include "include/cred.h"
16#include "include/policy.h"
17#include "include/ipc.h"
18#include "include/sig_names.h"
19
20
21static inline int map_signal_num(int sig)
22{
23 if (sig > SIGRTMAX)
24 return SIGUNKNOWN;
25 else if (sig >= SIGRTMIN)
26 return sig - SIGRTMIN + SIGRT_BASE;
27 else if (sig < MAXMAPPED_SIG)
28 return sig_map[sig];
29 return SIGUNKNOWN;
30}
31
32/**
33 * audit_signal_mask - convert mask to permission string
34 * @mask: permission mask to convert
35 *
36 * Returns: pointer to static string
37 */
38static const char *audit_signal_mask(u32 mask)
39{
40 if (mask & MAY_READ)
41 return "receive";
42 if (mask & MAY_WRITE)
43 return "send";
44 return "";
45}
46
47/**
48 * audit_signal_cb() - call back for signal specific audit fields
49 * @ab: audit_buffer (NOT NULL)
50 * @va: audit struct to audit values of (NOT NULL)
51 */
52static void audit_signal_cb(struct audit_buffer *ab, void *va)
53{
54 struct common_audit_data *sa = va;
55 struct apparmor_audit_data *ad = aad(sa);
56
57 if (ad->request & AA_SIGNAL_PERM_MASK) {
58 audit_log_format(ab, " requested_mask=\"%s\"",
59 audit_signal_mask(ad->request));
60 if (ad->denied & AA_SIGNAL_PERM_MASK) {
61 audit_log_format(ab, " denied_mask=\"%s\"",
62 audit_signal_mask(ad->denied));
63 }
64 }
65 if (ad->signal == SIGUNKNOWN)
66 audit_log_format(ab, "signal=unknown(%d)",
67 ad->unmappedsig);
68 else if (ad->signal < MAXMAPPED_SIGNAME)
69 audit_log_format(ab, " signal=%s", sig_names[ad->signal]);
70 else
71 audit_log_format(ab, " signal=rtmin+%d",
72 ad->signal - SIGRT_BASE);
73 audit_log_format(ab, " peer=");
74 aa_label_xaudit(ab, labels_ns(ad->subj_label), ad->peer,
75 FLAGS_NONE, GFP_ATOMIC);
76}
77
78static int profile_signal_perm(const struct cred *cred,
79 struct aa_profile *profile,
80 struct aa_label *peer, u32 request,
81 struct apparmor_audit_data *ad)
82{
83 struct aa_ruleset *rules = list_first_entry(&profile->rules,
84 typeof(*rules), list);
85 struct aa_perms perms;
86 aa_state_t state;
87
88 if (profile_unconfined(profile) ||
89 !ANY_RULE_MEDIATES(&profile->rules, AA_CLASS_SIGNAL))
90 return 0;
91
92 ad->subj_cred = cred;
93 ad->peer = peer;
94 /* TODO: secondary cache check <profile, profile, perm> */
95 state = aa_dfa_next(rules->policy->dfa,
96 rules->policy->start[AA_CLASS_SIGNAL],
97 ad->signal);
98 aa_label_match(profile, rules, peer, state, false, request, &perms);
99 aa_apply_modes_to_perms(profile, &perms);
100 return aa_check_perms(profile, &perms, request, ad, audit_signal_cb);
101}
102
103int aa_may_signal(const struct cred *subj_cred, struct aa_label *sender,
104 const struct cred *target_cred, struct aa_label *target,
105 int sig)
106{
107 struct aa_profile *profile;
108 DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_SIGNAL, OP_SIGNAL);
109
110 ad.signal = map_signal_num(sig);
111 ad.unmappedsig = sig;
112 return xcheck_labels(sender, target, profile,
113 profile_signal_perm(subj_cred, profile, target,
114 MAY_WRITE, &ad),
115 profile_signal_perm(target_cred, profile, sender,
116 MAY_READ, &ad));
117}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor ipc mediation
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2017 Canonical Ltd.
9 */
10
11#include <linux/gfp.h>
12
13#include "include/audit.h"
14#include "include/capability.h"
15#include "include/cred.h"
16#include "include/policy.h"
17#include "include/ipc.h"
18#include "include/sig_names.h"
19
20
21static inline int map_signal_num(int sig)
22{
23 if (sig > SIGRTMAX)
24 return SIGUNKNOWN;
25 else if (sig >= SIGRTMIN)
26 return sig - SIGRTMIN + SIGRT_BASE;
27 else if (sig < MAXMAPPED_SIG)
28 return sig_map[sig];
29 return SIGUNKNOWN;
30}
31
32/**
33 * audit_signal_mask - convert mask to permission string
34 * @mask: permission mask to convert
35 *
36 * Returns: pointer to static string
37 */
38static const char *audit_signal_mask(u32 mask)
39{
40 if (mask & MAY_READ)
41 return "receive";
42 if (mask & MAY_WRITE)
43 return "send";
44 return "";
45}
46
47/**
48 * audit_signal_cb() - call back for signal specific audit fields
49 * @ab: audit_buffer (NOT NULL)
50 * @va: audit struct to audit values of (NOT NULL)
51 */
52static void audit_signal_cb(struct audit_buffer *ab, void *va)
53{
54 struct common_audit_data *sa = va;
55
56 if (aad(sa)->request & AA_SIGNAL_PERM_MASK) {
57 audit_log_format(ab, " requested_mask=\"%s\"",
58 audit_signal_mask(aad(sa)->request));
59 if (aad(sa)->denied & AA_SIGNAL_PERM_MASK) {
60 audit_log_format(ab, " denied_mask=\"%s\"",
61 audit_signal_mask(aad(sa)->denied));
62 }
63 }
64 if (aad(sa)->signal == SIGUNKNOWN)
65 audit_log_format(ab, "signal=unknown(%d)",
66 aad(sa)->unmappedsig);
67 else if (aad(sa)->signal < MAXMAPPED_SIGNAME)
68 audit_log_format(ab, " signal=%s", sig_names[aad(sa)->signal]);
69 else
70 audit_log_format(ab, " signal=rtmin+%d",
71 aad(sa)->signal - SIGRT_BASE);
72 audit_log_format(ab, " peer=");
73 aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
74 FLAGS_NONE, GFP_ATOMIC);
75}
76
77static int profile_signal_perm(struct aa_profile *profile,
78 struct aa_label *peer, u32 request,
79 struct common_audit_data *sa)
80{
81 struct aa_ruleset *rules = list_first_entry(&profile->rules,
82 typeof(*rules), list);
83 struct aa_perms perms;
84 aa_state_t state;
85
86 if (profile_unconfined(profile) ||
87 !ANY_RULE_MEDIATES(&profile->rules, AA_CLASS_SIGNAL))
88 return 0;
89
90 aad(sa)->peer = peer;
91 /* TODO: secondary cache check <profile, profile, perm> */
92 state = aa_dfa_next(rules->policy.dfa,
93 rules->policy.start[AA_CLASS_SIGNAL],
94 aad(sa)->signal);
95 aa_label_match(profile, rules, peer, state, false, request, &perms);
96 aa_apply_modes_to_perms(profile, &perms);
97 return aa_check_perms(profile, &perms, request, sa, audit_signal_cb);
98}
99
100int aa_may_signal(struct aa_label *sender, struct aa_label *target, int sig)
101{
102 struct aa_profile *profile;
103 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, AA_CLASS_SIGNAL, OP_SIGNAL);
104
105 aad(&sa)->signal = map_signal_num(sig);
106 aad(&sa)->unmappedsig = sig;
107 return xcheck_labels(sender, target, profile,
108 profile_signal_perm(profile, target, MAY_WRITE, &sa),
109 profile_signal_perm(profile, sender, MAY_READ, &sa));
110}