linux/security/apparmor/audit.c
Richard Guy Briggs f1d9b23cab audit: purge audit_log_string from the intra-kernel audit API
audit_log_string() was inteded to be an internal audit function and
since there are only two internal uses, remove them.  Purge all external
uses of it by restructuring code to use an existing audit_log_format()
or using audit_log_format().

Please see the upstream issue
https://github.com/linux-audit/audit-kernel/issues/84

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
2020-07-21 11:12:31 -04:00

248 lines
5.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* AppArmor security module
*
* This file contains AppArmor auditing functions
*
* Copyright (C) 1998-2008 Novell/SUSE
* Copyright 2009-2010 Canonical Ltd.
*/
#include <linux/audit.h>
#include <linux/socket.h>
#include "include/apparmor.h"
#include "include/audit.h"
#include "include/policy.h"
#include "include/policy_ns.h"
#include "include/secid.h"
const char *const audit_mode_names[] = {
"normal",
"quiet_denied",
"quiet",
"noquiet",
"all"
};
static const char *const aa_audit_type[] = {
"AUDIT",
"ALLOWED",
"DENIED",
"HINT",
"STATUS",
"ERROR",
"KILLED",
"AUTO"
};
/*
* Currently AppArmor auditing is fed straight into the audit framework.
*
* TODO:
* netlink interface for complain mode
* user auditing, - send user auditing to netlink interface
* system control of whether user audit messages go to system log
*/
/**
* audit_base - core AppArmor function.
* @ab: audit buffer to fill (NOT NULL)
* @ca: audit structure containing data to audit (NOT NULL)
*
* Record common AppArmor audit data from @sa
*/
static void audit_pre(struct audit_buffer *ab, void *ca)
{
struct common_audit_data *sa = ca;
if (aa_g_audit_header) {
audit_log_format(ab, "apparmor=\"%s\"",
aa_audit_type[aad(sa)->type]);
}
if (aad(sa)->op) {
audit_log_format(ab, " operation=\"%s\"", aad(sa)->op);
}
if (aad(sa)->info) {
audit_log_format(ab, " info=\"%s\"", aad(sa)->info);
if (aad(sa)->error)
audit_log_format(ab, " error=%d", aad(sa)->error);
}
if (aad(sa)->label) {
struct aa_label *label = aad(sa)->label;
if (label_isprofile(label)) {
struct aa_profile *profile = labels_profile(label);
if (profile->ns != root_ns) {
audit_log_format(ab, " namespace=");
audit_log_untrustedstring(ab,
profile->ns->base.hname);
}
audit_log_format(ab, " profile=");
audit_log_untrustedstring(ab, profile->base.hname);
} else {
audit_log_format(ab, " label=");
aa_label_xaudit(ab, root_ns, label, FLAG_VIEW_SUBNS,
GFP_ATOMIC);
}
}
if (aad(sa)->name) {
audit_log_format(ab, " name=");
audit_log_untrustedstring(ab, aad(sa)->name);
}
}
/**
* aa_audit_msg - Log a message to the audit subsystem
* @sa: audit event structure (NOT NULL)
* @cb: optional callback fn for type specific fields (MAYBE NULL)
*/
void aa_audit_msg(int type, struct common_audit_data *sa,
void (*cb) (struct audit_buffer *, void *))
{
aad(sa)->type = type;
common_lsm_audit(sa, audit_pre, cb);
}
/**
* aa_audit - Log a profile based audit event to the audit subsystem
* @type: audit type for the message
* @profile: profile to check against (NOT NULL)
* @sa: audit event (NOT NULL)
* @cb: optional callback fn for type specific fields (MAYBE NULL)
*
* Handle default message switching based off of audit mode flags
*
* Returns: error on failure
*/
int aa_audit(int type, struct aa_profile *profile, struct common_audit_data *sa,
void (*cb) (struct audit_buffer *, void *))
{
AA_BUG(!profile);
if (type == AUDIT_APPARMOR_AUTO) {
if (likely(!aad(sa)->error)) {
if (AUDIT_MODE(profile) != AUDIT_ALL)
return 0;
type = AUDIT_APPARMOR_AUDIT;
} else if (COMPLAIN_MODE(profile))
type = AUDIT_APPARMOR_ALLOWED;
else
type = AUDIT_APPARMOR_DENIED;
}
if (AUDIT_MODE(profile) == AUDIT_QUIET ||
(type == AUDIT_APPARMOR_DENIED &&
AUDIT_MODE(profile) == AUDIT_QUIET))
return aad(sa)->error;
if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
type = AUDIT_APPARMOR_KILL;
aad(sa)->label = &profile->label;
aa_audit_msg(type, sa, cb);
if (aad(sa)->type == AUDIT_APPARMOR_KILL)
(void)send_sig_info(SIGKILL, NULL,
sa->type == LSM_AUDIT_DATA_TASK && sa->u.tsk ?
sa->u.tsk : current);
if (aad(sa)->type == AUDIT_APPARMOR_ALLOWED)
return complain_error(aad(sa)->error);
return aad(sa)->error;
}
struct aa_audit_rule {
struct aa_label *label;
};
void aa_audit_rule_free(void *vrule)
{
struct aa_audit_rule *rule = vrule;
if (rule) {
if (!IS_ERR(rule->label))
aa_put_label(rule->label);
kfree(rule);
}
}
int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
{
struct aa_audit_rule *rule;
switch (field) {
case AUDIT_SUBJ_ROLE:
if (op != Audit_equal && op != Audit_not_equal)
return -EINVAL;
break;
default:
return -EINVAL;
}
rule = kzalloc(sizeof(struct aa_audit_rule), GFP_KERNEL);
if (!rule)
return -ENOMEM;
/* Currently rules are treated as coming from the root ns */
rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr,
GFP_KERNEL, true, false);
if (IS_ERR(rule->label)) {
int err = PTR_ERR(rule->label);
aa_audit_rule_free(rule);
return err;
}
*vrule = rule;
return 0;
}
int aa_audit_rule_known(struct audit_krule *rule)
{
int i;
for (i = 0; i < rule->field_count; i++) {
struct audit_field *f = &rule->fields[i];
switch (f->type) {
case AUDIT_SUBJ_ROLE:
return 1;
}
}
return 0;
}
int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule)
{
struct aa_audit_rule *rule = vrule;
struct aa_label *label;
int found = 0;
label = aa_secid_to_label(sid);
if (!label)
return -ENOENT;
if (aa_label_is_subset(label, rule->label))
found = 1;
switch (field) {
case AUDIT_SUBJ_ROLE:
switch (op) {
case Audit_equal:
return found;
case Audit_not_equal:
return !found;
}
}
return 0;
}