CHROMIUM: Initial work eventizing tlsdated

tlsdated provides the daemonized integration of tlsdate and the host
system -- resumable time, DBus announcements, time-sync events, and so
on.

At present, it provides only netlink based wakeups and limited
time synchronization.  On Chromium OS, proxy support and network
changes are integrated through external shell scripts monitoring
DBus.  These scripts lack the robustness required for a production
grade time synchronization system.

This change is manyfold:
- Convert tlsdated "wakeup" input into events
- Convert tlsdate execution and status collection into a event-friendly technique
- Integrate libevent into the tlsdated design
- Integrate support for platform specific wake up events
- Integrate support for dynamic proxy resolution on each tlsdate call
- Integrate CrOS wakeup events: proxy changes, default network service change, power state/resume, etc
- Integrate time continuity checking using MONOTONIC clocks versus REALTIME for all wake events
- Integrate DBus support directly into the event loop to allow for message sending
  and signal receipt (e.g., dbus_announce)
- Addition of DOT file for laying out event flows
- Split off time setting to a privileged helper by having tlsdate pass back time_t
- Added configure support for --enable-cros and libevent2 checking
- Support dynamic proxy resolution for multiple sources
- Fixed a NULL deref in source traversal
- Added "sync type" and priority
- Added DBus interface for SetTime, CanSetTime, LastSyncInfo methods.
- Added "sync source" to the TimeUpdated signal
- Updated existing unittests
- Add seccomp filter for priv'd time setter
- Added dynamic proxy per source so we can add a final source with no proxy.
- Style consistency: "find ./ -name '*.[ch]' -exec astyle --style=gnu -xd \{\} \;"
  Followed by the same with sed -i -e 's/) )/))/g'
- Added DBus policy and interface files and a new dbus-client-group configure argument.

Design: https://docs.google.com/a/google.com/document/d/1U1y7KBMo-BgWPspzoyeO5gSmU6dMwEJBc2HNNkGMJzY/view

- Outstanding work: new unit and integration tests

BUG=chromium:271644
TEST=manually tested on x86_64, arm, and x86-32.
     end-to-end autotest: https://chromium-review.googlesource.com/#/c/169141/
     fixed up existing autotests: https://chromium-review.googlesource.com/174782

Change-Id: I0d24951182a768532d6d04eea2224ac70cf04052
Reviewed-on: https://chromium-review.googlesource.com/169131
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Tested-by: Will Drewry <wad@chromium.org>
Commit-Queue: Will Drewry <wad@chromium.org>

1 files changed, 0 insertions, 24 deletions

diff --git a/man/tlsdate-dbus-announce.1 b/man/tlsdate-dbus-announce.1
deleted file mode 100644
index 92f4947..0000000
--- a/man/tlsdate-dbus-announce.1
+++ /dev/null
@@ -1,24 +0,0 @@
-.\" Process this file with
-.\" groff -man -Tascii foo.1
-.\"
-.TH TLSDATE-DBUS-ANNOUNCE 1 "JANUARY 2013" Linux "User Manuals"
-.SH NAME
-tlsdate-dbus-announce \- secure parasitic rdate replacement dbus announcer
-.SH SYNOPSIS
-.B tlsdate-dbus-announce
-.SH DESCRIPTION
-.B tlsdate-dbus-announce
-is a tool for use with tlsdated. It is automatically launched by tlsdated to
-announce that the system time has changed.
-.SH BUGS
-It's likely! Let us know by contacting jacob@appelbaum.net
-
-Note that
-.B tlsdate(1)
-is still in Alpha, and may not work as expected.
-.SH AUTHOR
-Jacob Appelbaum <jacob at appelbaum dot net>
-.SH "SEE ALSO"
-.B tlsdated(1),
-.B tlsdate-helper(1)
-.B tlsdate-routeup(1)