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115 lines
3.9 KiB
Plaintext
115 lines
3.9 KiB
Plaintext
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsSandboxViolationSink.h"
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#include <unistd.h>
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#include <time.h>
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#include <asl.h>
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#include <dispatch/dispatch.h>
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#include <notify.h>
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#include "nsCocoaDebugUtils.h"
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#include "mozilla/Preferences.h"
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int nsSandboxViolationSink::mNotifyToken = 0;
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uint64_t nsSandboxViolationSink::mLastMsgReceived = 0;
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void
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nsSandboxViolationSink::Start()
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{
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if (mNotifyToken) {
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return;
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}
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notify_register_dispatch(SANDBOX_VIOLATION_NOTIFICATION_NAME,
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&mNotifyToken,
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dispatch_queue_create(SANDBOX_VIOLATION_QUEUE_NAME,
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DISPATCH_QUEUE_SERIAL),
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^(int token) { ViolationHandler(); });
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}
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void
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nsSandboxViolationSink::Stop()
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{
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if (!mNotifyToken) {
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return;
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}
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notify_cancel(mNotifyToken);
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mNotifyToken = 0;
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}
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// We need to query syslogd to find out what violations occurred, and whether
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// they were "ours". We can use the Apple System Log facility to do this.
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// Besides calling notify_post("com.apple.sandbox.violation.*"), Apple's
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// sandboxd also reports all sandbox violations (sent to it by the Sandbox
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// kernel extension) to syslogd, which stores them and makes them viewable
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// in the system console. This is the database we query.
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// ViolationHandler() is always called on its own secondary thread. This
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// makes it unlikely it will interfere with other browser activity.
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void
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nsSandboxViolationSink::ViolationHandler()
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{
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aslmsg query = asl_new(ASL_TYPE_QUERY);
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asl_set_query(query, ASL_KEY_FACILITY, "com.apple.sandbox",
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ASL_QUERY_OP_EQUAL);
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// Only get reports that were generated very recently.
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char query_time[30] = {0};
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snprintf(query_time, sizeof(query_time), "%li", time(NULL) - 2);
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asl_set_query(query, ASL_KEY_TIME, query_time,
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ASL_QUERY_OP_NUMERIC | ASL_QUERY_OP_GREATER_EQUAL);
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// This code is easier to test if we don't just track "our" violations,
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// which are (normally) few and far between. For example (for the time
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// being at least) four appleeventsd sandbox violations happen every time
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// we start the browser in e10s mode. But it makes sense to default to
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// only tracking "our" violations.
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if (mozilla::Preferences::GetBool(
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"security.sandbox.mac.track.violations.oursonly", true)) {
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// This makes each of our processes log its own violations. It might
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// be better to make the chrome process log all the other processes'
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// violations.
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char query_pid[20] = {0};
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snprintf(query_pid, sizeof(query_pid), "%u", getpid());
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asl_set_query(query, ASL_KEY_REF_PID, query_pid, ASL_QUERY_OP_EQUAL);
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}
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aslresponse response = asl_search(nullptr, query);
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// Each time ViolationHandler() is called we grab as many messages as are
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// available. Otherwise we might not get them all.
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if (response) {
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while (true) {
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aslmsg hit = nullptr;
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aslmsg found = nullptr;
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const char* id_str;
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while ((hit = aslresponse_next(response))) {
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// Record the message id to avoid logging the same violation more
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// than once.
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id_str = asl_get(hit, ASL_KEY_MSG_ID);
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uint64_t id_val = atoll(id_str);
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if (id_val <= mLastMsgReceived) {
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continue;
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}
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mLastMsgReceived = id_val;
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found = hit;
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break;
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}
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if (!found) {
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break;
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}
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const char* pid_str = asl_get(found, ASL_KEY_REF_PID);
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const char* message_str = asl_get(found, ASL_KEY_MSG);
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nsCocoaDebugUtils::DebugLog("nsSandboxViolationSink::ViolationHandler(): id %s, pid %s, message %s",
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id_str, pid_str, message_str);
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}
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aslresponse_free(response);
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}
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}
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