163 строки
4.2 KiB
C
163 строки
4.2 KiB
C
/*
|
|
* AppArmor security module
|
|
*
|
|
* This file contains AppArmor capability mediation functions
|
|
*
|
|
* Copyright (C) 1998-2008 Novell/SUSE
|
|
* Copyright 2009-2010 Canonical Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation, version 2 of the
|
|
* License.
|
|
*/
|
|
|
|
#include <linux/capability.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/security.h>
|
|
|
|
#include "include/apparmor.h"
|
|
#include "include/capability.h"
|
|
#include "include/cred.h"
|
|
#include "include/policy.h"
|
|
#include "include/audit.h"
|
|
|
|
/*
|
|
* Table of capability names: we generate it from capabilities.h.
|
|
*/
|
|
#include "capability_names.h"
|
|
|
|
struct aa_sfs_entry aa_sfs_entry_caps[] = {
|
|
AA_SFS_FILE_STRING("mask", AA_SFS_CAPS_MASK),
|
|
{ }
|
|
};
|
|
|
|
struct audit_cache {
|
|
struct aa_profile *profile;
|
|
kernel_cap_t caps;
|
|
};
|
|
|
|
static DEFINE_PER_CPU(struct audit_cache, audit_cache);
|
|
|
|
/**
|
|
* audit_cb - call back for capability components of audit struct
|
|
* @ab - audit buffer (NOT NULL)
|
|
* @va - audit struct to audit data from (NOT NULL)
|
|
*/
|
|
static void audit_cb(struct audit_buffer *ab, void *va)
|
|
{
|
|
struct common_audit_data *sa = va;
|
|
|
|
audit_log_format(ab, " capname=");
|
|
audit_log_untrustedstring(ab, capability_names[sa->u.cap]);
|
|
}
|
|
|
|
/**
|
|
* audit_caps - audit a capability
|
|
* @sa: audit data
|
|
* @profile: profile being tested for confinement (NOT NULL)
|
|
* @cap: capability tested
|
|
* @error: error code returned by test
|
|
*
|
|
* Do auditing of capability and handle, audit/complain/kill modes switching
|
|
* and duplicate message elimination.
|
|
*
|
|
* Returns: 0 or sa->error on success, error code on failure
|
|
*/
|
|
static int audit_caps(struct common_audit_data *sa, struct aa_profile *profile,
|
|
int cap, int error)
|
|
{
|
|
struct audit_cache *ent;
|
|
int type = AUDIT_APPARMOR_AUTO;
|
|
|
|
aad(sa)->error = error;
|
|
|
|
if (likely(!error)) {
|
|
/* test if auditing is being forced */
|
|
if (likely((AUDIT_MODE(profile) != AUDIT_ALL) &&
|
|
!cap_raised(profile->caps.audit, cap)))
|
|
return 0;
|
|
type = AUDIT_APPARMOR_AUDIT;
|
|
} else if (KILL_MODE(profile) ||
|
|
cap_raised(profile->caps.kill, cap)) {
|
|
type = AUDIT_APPARMOR_KILL;
|
|
} else if (cap_raised(profile->caps.quiet, cap) &&
|
|
AUDIT_MODE(profile) != AUDIT_NOQUIET &&
|
|
AUDIT_MODE(profile) != AUDIT_ALL) {
|
|
/* quiet auditing */
|
|
return error;
|
|
}
|
|
|
|
/* Do simple duplicate message elimination */
|
|
ent = &get_cpu_var(audit_cache);
|
|
if (profile == ent->profile && cap_raised(ent->caps, cap)) {
|
|
put_cpu_var(audit_cache);
|
|
if (COMPLAIN_MODE(profile))
|
|
return complain_error(error);
|
|
return error;
|
|
} else {
|
|
aa_put_profile(ent->profile);
|
|
ent->profile = aa_get_profile(profile);
|
|
cap_raise(ent->caps, cap);
|
|
}
|
|
put_cpu_var(audit_cache);
|
|
|
|
return aa_audit(type, profile, sa, audit_cb);
|
|
}
|
|
|
|
/**
|
|
* profile_capable - test if profile allows use of capability @cap
|
|
* @profile: profile being enforced (NOT NULL, NOT unconfined)
|
|
* @cap: capability to test if allowed
|
|
* @audit: whether an audit record should be generated
|
|
* @sa: audit data (MAY BE NULL indicating no auditing)
|
|
*
|
|
* Returns: 0 if allowed else -EPERM
|
|
*/
|
|
static int profile_capable(struct aa_profile *profile, int cap, int audit,
|
|
struct common_audit_data *sa)
|
|
{
|
|
int error;
|
|
|
|
if (cap_raised(profile->caps.allow, cap) &&
|
|
!cap_raised(profile->caps.denied, cap))
|
|
error = 0;
|
|
else
|
|
error = -EPERM;
|
|
|
|
if (audit == SECURITY_CAP_NOAUDIT) {
|
|
if (!COMPLAIN_MODE(profile))
|
|
return error;
|
|
/* audit the cap request in complain mode but note that it
|
|
* should be optional.
|
|
*/
|
|
aad(sa)->info = "optional: no audit";
|
|
}
|
|
|
|
return audit_caps(sa, profile, cap, error);
|
|
}
|
|
|
|
/**
|
|
* aa_capable - test permission to use capability
|
|
* @label: label being tested for capability (NOT NULL)
|
|
* @cap: capability to be tested
|
|
* @audit: whether an audit record should be generated
|
|
*
|
|
* Look up capability in profile capability set.
|
|
*
|
|
* Returns: 0 on success, or else an error code.
|
|
*/
|
|
int aa_capable(struct aa_label *label, int cap, int audit)
|
|
{
|
|
struct aa_profile *profile;
|
|
int error = 0;
|
|
DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_CAP, OP_CAPABLE);
|
|
|
|
sa.u.cap = cap;
|
|
error = fn_for_each_confined(label, profile,
|
|
profile_capable(profile, cap, audit, &sa));
|
|
|
|
return error;
|
|
}
|