Add security process document

doc/Makefile.am

@@ -203,6 +203,7 @@ EXTRA_DIST = \
 	sources/python-apiref.rst \
 	sources/building-android-binary.rst \
 	sources/contribute.rst \
+	sources/security.rst \
 	_exts/sphinxcontrib/LICENSE.rubydomain \
 	_exts/sphinxcontrib/__init__.py \
 	_exts/sphinxcontrib/rubydomain.py \

doc/security.rst

@@ -0,0 +1 @@
+.. include:: ../doc/sources/security.rst

doc/sources/index.rst

@@ -18,6 +18,7 @@ Contents:
 
    package_README
    contribute
+   security
    building-android-binary
    tutorial-client
    tutorial-server

doc/sources/security.rst

@@ -0,0 +1,38 @@
+Security Process
+================
+
+If you find a vulnerability in our software, please send the email to
+"tatsuhiro.t at gmail dot com" about its details instead of submitting
+issues on github issue page.  It is a standard practice not to
+disclose vulnerability information publicly until a fixed version is
+released, or mitigation is worked out.  In the future, we may setup a
+dedicated mail address for this purpose.
+
+If we identify that the reported issue is really a vulnerability, we
+open a new security advisory draft using `GitHub security feature
+<https://github.com/nghttp2/nghttp2/security>`_ and discuss the
+mitigation and bug fixes there.  The fixes are committed to the
+private repository.
+
+We write the security advisory and get CVE number from GitHub
+privately.  We also discuss the disclosure date to the public.
+
+We make a new release with the fix at the same time when the
+vulnerability is disclosed to public.
+
+At least 7 days before the public disclosure date, we will post
+security advisory (which includes all the details of the vulnerability
+and the possible mitigation strategies) and the patches to fix the
+issue to `distros@openwall
+<https://oss-security.openwall.org/wiki/mailing-lists/distros>`_
+mailing list.  We also open a new issue on `nghttp2 issue tracker
+<https://github.com/nghttp2/nghttp2/issues>`_ which notifies that the
+upcoming release will have a security fix.  The ``SECURITY`` label is
+attached to this kind of issue.
+
+Before few hours of new release, we merge the fixes to the master
+branch (and/or a release branch if necessary) and make a new release.
+Security advisory is disclosed on GitHub.  We also post the
+vulnerability information to `oss-secirty
+<https://oss-security.openwall.org/wiki/mailing-lists/oss-security>`_
+mailing list.