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![Jiapeng Chong](/assets/img/avatar_default.png)
security/apparmor/audit.c:93: warning: expecting prototype for audit_base(). Prototype was for audit_pre() instead. Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2339 Reported-by: Abaci Robot <abaci@linux.alibaba.com> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
290 lines
5.8 KiB
C
290 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AppArmor security module
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*
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* This file contains AppArmor auditing functions
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*/
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#include <linux/audit.h>
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#include <linux/socket.h>
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#include "include/apparmor.h"
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#include "include/audit.h"
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#include "include/policy.h"
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#include "include/policy_ns.h"
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#include "include/secid.h"
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const char *const audit_mode_names[] = {
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"normal",
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"quiet_denied",
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"quiet",
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"noquiet",
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"all"
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};
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static const char *const aa_audit_type[] = {
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"AUDIT",
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"ALLOWED",
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"DENIED",
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"HINT",
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"STATUS",
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"ERROR",
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"KILLED",
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"AUTO"
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};
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static const char *const aa_class_names[] = {
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"none",
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"unknown",
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"file",
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"cap",
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"net",
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"rlimits",
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"domain",
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"mount",
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"unknown",
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"ptrace",
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"signal",
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"xmatch",
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"unknown",
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"unknown",
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"net",
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"unknown",
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"label",
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"posix_mqueue",
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"io_uring",
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"module",
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"lsm",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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"X",
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"dbus",
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};
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/*
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* Currently AppArmor auditing is fed straight into the audit framework.
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*
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* TODO:
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* netlink interface for complain mode
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* user auditing, - send user auditing to netlink interface
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* system control of whether user audit messages go to system log
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*/
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/**
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* audit_pre() - core AppArmor function.
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* @ab: audit buffer to fill (NOT NULL)
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* @ca: audit structure containing data to audit (NOT NULL)
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*
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* Record common AppArmor audit data from @sa
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*/
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static void audit_pre(struct audit_buffer *ab, void *ca)
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{
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struct common_audit_data *sa = ca;
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if (aa_g_audit_header) {
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audit_log_format(ab, "apparmor=\"%s\"",
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aa_audit_type[aad(sa)->type]);
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}
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if (aad(sa)->op) {
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audit_log_format(ab, " operation=\"%s\"", aad(sa)->op);
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}
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if (aad(sa)->class)
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audit_log_format(ab, " class=\"%s\"",
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aad(sa)->class <= AA_CLASS_LAST ?
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aa_class_names[aad(sa)->class] :
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"unknown");
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if (aad(sa)->info) {
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audit_log_format(ab, " info=\"%s\"", aad(sa)->info);
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if (aad(sa)->error)
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audit_log_format(ab, " error=%d", aad(sa)->error);
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}
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if (aad(sa)->label) {
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struct aa_label *label = aad(sa)->label;
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if (label_isprofile(label)) {
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struct aa_profile *profile = labels_profile(label);
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if (profile->ns != root_ns) {
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audit_log_format(ab, " namespace=");
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audit_log_untrustedstring(ab,
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profile->ns->base.hname);
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}
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audit_log_format(ab, " profile=");
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audit_log_untrustedstring(ab, profile->base.hname);
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} else {
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audit_log_format(ab, " label=");
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aa_label_xaudit(ab, root_ns, label, FLAG_VIEW_SUBNS,
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GFP_ATOMIC);
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}
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}
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if (aad(sa)->name) {
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audit_log_format(ab, " name=");
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audit_log_untrustedstring(ab, aad(sa)->name);
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}
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}
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/**
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* aa_audit_msg - Log a message to the audit subsystem
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* @sa: audit event structure (NOT NULL)
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* @cb: optional callback fn for type specific fields (MAYBE NULL)
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*/
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void aa_audit_msg(int type, struct common_audit_data *sa,
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void (*cb) (struct audit_buffer *, void *))
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{
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aad(sa)->type = type;
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common_lsm_audit(sa, audit_pre, cb);
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}
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/**
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* aa_audit - Log a profile based audit event to the audit subsystem
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* @type: audit type for the message
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* @profile: profile to check against (NOT NULL)
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* @sa: audit event (NOT NULL)
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* @cb: optional callback fn for type specific fields (MAYBE NULL)
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*
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* Handle default message switching based off of audit mode flags
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*
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* Returns: error on failure
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*/
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int aa_audit(int type, struct aa_profile *profile, struct common_audit_data *sa,
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void (*cb) (struct audit_buffer *, void *))
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{
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AA_BUG(!profile);
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if (type == AUDIT_APPARMOR_AUTO) {
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if (likely(!aad(sa)->error)) {
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if (AUDIT_MODE(profile) != AUDIT_ALL)
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return 0;
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type = AUDIT_APPARMOR_AUDIT;
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} else if (COMPLAIN_MODE(profile))
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type = AUDIT_APPARMOR_ALLOWED;
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else
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type = AUDIT_APPARMOR_DENIED;
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}
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if (AUDIT_MODE(profile) == AUDIT_QUIET ||
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(type == AUDIT_APPARMOR_DENIED &&
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AUDIT_MODE(profile) == AUDIT_QUIET_DENIED))
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return aad(sa)->error;
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if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED)
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type = AUDIT_APPARMOR_KILL;
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aad(sa)->label = &profile->label;
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aa_audit_msg(type, sa, cb);
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if (aad(sa)->type == AUDIT_APPARMOR_KILL)
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(void)send_sig_info(SIGKILL, NULL,
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sa->type == LSM_AUDIT_DATA_TASK && sa->u.tsk ?
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sa->u.tsk : current);
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if (aad(sa)->type == AUDIT_APPARMOR_ALLOWED)
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return complain_error(aad(sa)->error);
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return aad(sa)->error;
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}
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struct aa_audit_rule {
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struct aa_label *label;
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};
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void aa_audit_rule_free(void *vrule)
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{
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struct aa_audit_rule *rule = vrule;
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if (rule) {
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if (!IS_ERR(rule->label))
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aa_put_label(rule->label);
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kfree(rule);
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}
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}
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int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
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{
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struct aa_audit_rule *rule;
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switch (field) {
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case AUDIT_SUBJ_ROLE:
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if (op != Audit_equal && op != Audit_not_equal)
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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rule = kzalloc(sizeof(struct aa_audit_rule), GFP_KERNEL);
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if (!rule)
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return -ENOMEM;
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/* Currently rules are treated as coming from the root ns */
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rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr,
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GFP_KERNEL, true, false);
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if (IS_ERR(rule->label)) {
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int err = PTR_ERR(rule->label);
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aa_audit_rule_free(rule);
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return err;
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}
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*vrule = rule;
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return 0;
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}
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int aa_audit_rule_known(struct audit_krule *rule)
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{
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int i;
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for (i = 0; i < rule->field_count; i++) {
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struct audit_field *f = &rule->fields[i];
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switch (f->type) {
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case AUDIT_SUBJ_ROLE:
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return 1;
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}
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}
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return 0;
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}
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int aa_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule)
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{
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struct aa_audit_rule *rule = vrule;
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struct aa_label *label;
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int found = 0;
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label = aa_secid_to_label(sid);
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if (!label)
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return -ENOENT;
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if (aa_label_is_subset(label, rule->label))
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found = 1;
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switch (field) {
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case AUDIT_SUBJ_ROLE:
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switch (op) {
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case Audit_equal:
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return found;
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case Audit_not_equal:
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return !found;
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}
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}
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return 0;
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}
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