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-rw-r--r--security/apparmor/capability.c141
-rw-r--r--security/apparmor/include/capability.h45
-rw-r--r--security/apparmor/include/ipc.h28
-rw-r--r--security/apparmor/include/resource.h46
-rw-r--r--security/apparmor/ipc.c114
-rw-r--r--security/apparmor/resource.c134
6 files changed, 508 insertions, 0 deletions
diff --git a/security/apparmor/capability.c b/security/apparmor/capability.c
new file mode 100644
index 000000000000..9982c48def4e
--- /dev/null
+++ b/security/apparmor/capability.c
@@ -0,0 +1,141 @@
1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor capability mediation functions
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/capability.h>
16#include <linux/errno.h>
17#include <linux/gfp.h>
18
19#include "include/apparmor.h"
20#include "include/capability.h"
21#include "include/context.h"
22#include "include/policy.h"
23#include "include/audit.h"
24
25/*
26 * Table of capability names: we generate it from capabilities.h.
27 */
28#include "capability_names.h"
29
30struct audit_cache {
31 struct aa_profile *profile;
32 kernel_cap_t caps;
33};
34
35static DEFINE_PER_CPU(struct audit_cache, audit_cache);
36
37/**
38 * audit_cb - call back for capability components of audit struct
39 * @ab - audit buffer (NOT NULL)
40 * @va - audit struct to audit data from (NOT NULL)
41 */
42static void audit_cb(struct audit_buffer *ab, void *va)
43{
44 struct common_audit_data *sa = va;
45 audit_log_format(ab, " capname=");
46 audit_log_untrustedstring(ab, capability_names[sa->u.cap]);
47}
48
49/**
50 * audit_caps - audit a capability
51 * @profile: profile confining task (NOT NULL)
52 * @task: task capability test was performed against (NOT NULL)
53 * @cap: capability tested
54 * @error: error code returned by test
55 *
56 * Do auditing of capability and handle, audit/complain/kill modes switching
57 * and duplicate message elimination.
58 *
59 * Returns: 0 or sa->error on success, error code on failure
60 */
61static int audit_caps(struct aa_profile *profile, struct task_struct *task,
62 int cap, int error)
63{
64 struct audit_cache *ent;
65 int type = AUDIT_APPARMOR_AUTO;
66 struct common_audit_data sa;
67 COMMON_AUDIT_DATA_INIT(&sa, CAP);
68 sa.tsk = task;
69 sa.u.cap = cap;
70 sa.aad.op = OP_CAPABLE;
71 sa.aad.error = error;
72
73 if (likely(!error)) {
74 /* test if auditing is being forced */
75 if (likely((AUDIT_MODE(profile) != AUDIT_ALL) &&
76 !cap_raised(profile->caps.audit, cap)))
77 return 0;
78 type = AUDIT_APPARMOR_AUDIT;
79 } else if (KILL_MODE(profile) ||
80 cap_raised(profile->caps.kill, cap)) {
81 type = AUDIT_APPARMOR_KILL;
82 } else if (cap_raised(profile->caps.quiet, cap) &&
83 AUDIT_MODE(profile) != AUDIT_NOQUIET &&
84 AUDIT_MODE(profile) != AUDIT_ALL) {
85 /* quiet auditing */
86 return error;
87 }
88
89 /* Do simple duplicate message elimination */
90 ent = &get_cpu_var(audit_cache);
91 if (profile == ent->profile && cap_raised(ent->caps, cap)) {
92 put_cpu_var(audit_cache);
93 if (COMPLAIN_MODE(profile))
94 return complain_error(error);
95 return error;
96 } else {
97 aa_put_profile(ent->profile);
98 ent->profile = aa_get_profile(profile);
99 cap_raise(ent->caps, cap);
100 }
101 put_cpu_var(audit_cache);
102
103 return aa_audit(type, profile, GFP_ATOMIC, &sa, audit_cb);
104}
105
106/**
107 * profile_capable - test if profile allows use of capability @cap
108 * @profile: profile being enforced (NOT NULL, NOT unconfined)
109 * @cap: capability to test if allowed
110 *
111 * Returns: 0 if allowed else -EPERM
112 */
113static int profile_capable(struct aa_profile *profile, int cap)
114{
115 return cap_raised(profile->caps.allow, cap) ? 0 : -EPERM;
116}
117
118/**
119 * aa_capable - test permission to use capability
120 * @task: task doing capability test against (NOT NULL)
121 * @profile: profile confining @task (NOT NULL)
122 * @cap: capability to be tested
123 * @audit: whether an audit record should be generated
124 *
125 * Look up capability in profile capability set.
126 *
127 * Returns: 0 on success, or else an error code.
128 */
129int aa_capable(struct task_struct *task, struct aa_profile *profile, int cap,
130 int audit)
131{
132 int error = profile_capable(profile, cap);
133
134 if (!audit) {
135 if (COMPLAIN_MODE(profile))
136 return complain_error(error);
137 return error;
138 }
139
140 return audit_caps(profile, task, cap, error);
141}
diff --git a/security/apparmor/include/capability.h b/security/apparmor/include/capability.h
new file mode 100644
index 000000000000..c24d2959ea02
--- /dev/null
+++ b/security/apparmor/include/capability.h
@@ -0,0 +1,45 @@
1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor capability mediation definitions.
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#ifndef __AA_CAPABILITY_H
16#define __AA_CAPABILITY_H
17
18#include <linux/sched.h>
19
20struct aa_profile;
21
22/* aa_caps - confinement data for capabilities
23 * @allowed: capabilities mask
24 * @audit: caps that are to be audited
25 * @quiet: caps that should not be audited
26 * @kill: caps that when requested will result in the task being killed
27 * @extended: caps that are subject finer grained mediation
28 */
29struct aa_caps {
30 kernel_cap_t allow;
31 kernel_cap_t audit;
32 kernel_cap_t quiet;
33 kernel_cap_t kill;
34 kernel_cap_t extended;
35};
36
37int aa_capable(struct task_struct *task, struct aa_profile *profile, int cap,
38 int audit);
39
40static inline void aa_free_cap_rules(struct aa_caps *caps)
41{
42 /* NOP */
43}
44
45#endif /* __AA_CAPBILITY_H */
diff --git a/security/apparmor/include/ipc.h b/security/apparmor/include/ipc.h
new file mode 100644
index 000000000000..aeda0fbc8b2f
--- /dev/null
+++ b/security/apparmor/include/ipc.h
@@ -0,0 +1,28 @@
1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor ipc mediation function definitions.
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#ifndef __AA_IPC_H
16#define __AA_IPC_H
17
18#include <linux/sched.h>
19
20struct aa_profile;
21
22int aa_may_ptrace(struct task_struct *tracer_task, struct aa_profile *tracer,
23 struct aa_profile *tracee, unsigned int mode);
24
25int aa_ptrace(struct task_struct *tracer, struct task_struct *tracee,
26 unsigned int mode);
27
28#endif /* __AA_IPC_H */
diff --git a/security/apparmor/include/resource.h b/security/apparmor/include/resource.h
new file mode 100644
index 000000000000..3c88be946494
--- /dev/null
+++ b/security/apparmor/include/resource.h
@@ -0,0 +1,46 @@
1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor resource limits function definitions.
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#ifndef __AA_RESOURCE_H
16#define __AA_RESOURCE_H
17
18#include <linux/resource.h>
19#include <linux/sched.h>
20
21struct aa_profile;
22
23/* struct aa_rlimit - rlimit settings for the profile
24 * @mask: which hard limits to set
25 * @limits: rlimit values that override task limits
26 *
27 * AppArmor rlimits are used to set confined task rlimits. Only the
28 * limits specified in @mask will be controlled by apparmor.
29 */
30struct aa_rlimit {
31 unsigned int mask;
32 struct rlimit limits[RLIM_NLIMITS];
33};
34
35int aa_map_resource(int resource);
36int aa_task_setrlimit(struct aa_profile *profile, unsigned int resource,
37 struct rlimit *new_rlim);
38
39void __aa_transition_rlimits(struct aa_profile *old, struct aa_profile *new);
40
41static inline void aa_free_rlimit_rules(struct aa_rlimit *rlims)
42{
43 /* NOP */
44}
45
46#endif /* __AA_RESOURCE_H */
diff --git a/security/apparmor/ipc.c b/security/apparmor/ipc.c
new file mode 100644
index 000000000000..9013a78a1663
--- /dev/null
+++ b/security/apparmor/ipc.c
@@ -0,0 +1,114 @@
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 */
24static 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 */
39static 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 */
61int 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 */
83int 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 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}
diff --git a/security/apparmor/resource.c b/security/apparmor/resource.c
new file mode 100644
index 000000000000..4a368f1fd36d
--- /dev/null
+++ b/security/apparmor/resource.c
@@ -0,0 +1,134 @@
1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor resource mediation and attachment
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/audit.h>
16
17#include "include/audit.h"
18#include "include/resource.h"
19#include "include/policy.h"
20
21/*
22 * Table of rlimit names: we generate it from resource.h.
23 */
24#include "rlim_names.h"
25
26/* audit callback for resource specific fields */
27static void audit_cb(struct audit_buffer *ab, void *va)
28{
29 struct common_audit_data *sa = va;
30
31 audit_log_format(ab, " rlimit=%s value=%lu",
32 rlim_names[sa->aad.rlim.rlim], sa->aad.rlim.max);
33}
34
35/**
36 * audit_resource - audit setting resource limit
37 * @profile: profile being enforced (NOT NULL)
38 * @resoure: rlimit being auditing
39 * @value: value being set
40 * @error: error value
41 *
42 * Returns: 0 or sa->error else other error code on failure
43 */
44static int audit_resource(struct aa_profile *profile, unsigned int resource,
45 unsigned long value, int error)
46{
47 struct common_audit_data sa;
48
49 COMMON_AUDIT_DATA_INIT(&sa, NONE);
50 sa.aad.op = OP_SETRLIMIT,
51 sa.aad.rlim.rlim = resource;
52 sa.aad.rlim.max = value;
53 sa.aad.error = error;
54 return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_KERNEL, &sa,
55 audit_cb);
56}
57
58/**
59 * aa_map_resouce - map compiled policy resource to internal #
60 * @resource: flattened policy resource number
61 *
62 * Returns: resource # for the current architecture.
63 *
64 * rlimit resource can vary based on architecture, map the compiled policy
65 * resource # to the internal representation for the architecture.
66 */
67int aa_map_resource(int resource)
68{
69 return rlim_map[resource];
70}
71
72/**
73 * aa_task_setrlimit - test permission to set an rlimit
74 * @profile - profile confining the task (NOT NULL)
75 * @resource - the resource being set
76 * @new_rlim - the new resource limit (NOT NULL)
77 *
78 * Control raising the processes hard limit.
79 *
80 * Returns: 0 or error code if setting resource failed
81 */
82int aa_task_setrlimit(struct aa_profile *profile, unsigned int resource,
83 struct rlimit *new_rlim)
84{
85 int error = 0;
86
87 if (profile->rlimits.mask & (1 << resource) &&
88 new_rlim->rlim_max > profile->rlimits.limits[resource].rlim_max)
89
90 error = audit_resource(profile, resource, new_rlim->rlim_max,
91 -EACCES);
92
93 return error;
94}
95
96/**
97 * __aa_transition_rlimits - apply new profile rlimits
98 * @old: old profile on task (NOT NULL)
99 * @new: new profile with rlimits to apply (NOT NULL)
100 */
101void __aa_transition_rlimits(struct aa_profile *old, struct aa_profile *new)
102{
103 unsigned int mask = 0;
104 struct rlimit *rlim, *initrlim;
105 int i;
106
107 /* for any rlimits the profile controlled reset the soft limit
108 * to the less of the tasks hard limit and the init tasks soft limit
109 */
110 if (old->rlimits.mask) {
111 for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {
112 if (old->rlimits.mask & mask) {
113 rlim = current->signal->rlim + i;
114 initrlim = init_task.signal->rlim + i;
115 rlim->rlim_cur = min(rlim->rlim_max,
116 initrlim->rlim_cur);
117 }
118 }
119 }
120
121 /* set any new hard limits as dictated by the new profile */
122 if (!new->rlimits.mask)
123 return;
124 for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {
125 if (!(new->rlimits.mask & mask))
126 continue;
127
128 rlim = current->signal->rlim + i;
129 rlim->rlim_max = min(rlim->rlim_max,
130 new->rlimits.limits[i].rlim_max);
131 /* soft limit should not exceed hard limit */
132 rlim->rlim_cur = min(rlim->rlim_cur, rlim->rlim_max);
133 }
134}
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-07 19:39:16 -0400