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threading: Add factory that creates curl session for each thread....

threading: Add factory that creates curl session for each thread. When creating a repo with an import url pointing to another repo on the same enterprise instance we call the vcssserver to check the url. The vcsserver then calls to enterprise to verify the url. This leads to two threads using the same cur session.

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      .. _dh-apache:

      Diffie-Hellman Security

      -----------------------

      To secure your web server, the `Guide to Deploying Diffie-Hellman for TLS`_

      contains important information worth reading. This link contains some good

      `secure Apache configuration`_ examples.

      To secure your deployment of Diffie-Hellman, configure the following:

      1. Generate a strong Diffie-hellman group, 2048-bit or stronger.

      .. code-block:: bash

          # to generate your dhparam.pem file, run in the terminal

          openssl dhparam -out /etc/apache/ssl/dhparam.pem 2048

      2. Configure your server to only use modern, secure cipher suites in the

         virtual hosts configuration file.

      .. code-block:: apache

          # Set the protocol to only use modern, secure cipher suites.

          SSLProtocol             all -SSLv2 -SSLv3

          SSLHonorCipherOrder     on

          SSLCipherSuite          ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA

          # Specify your DH params file as follows

          SSLOpenSSLConfCmd DHParameters "{path to dhparams.pem}"

      .. _Guide to Deploying Diffie-Hellman for TLS: https://weakdh.org/sysadmin.html

      .. _secure Apache configuration: http://www.apache-ssl.org/httpd.conf.example

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marcink project: added all source files and assets	r1	.. _dh-apache:

		Diffie-Hellman Security
		-----------------------

		To secure your web server, the `Guide to Deploying Diffie-Hellman for TLS`_
		contains important information worth reading. This link contains some good
		`secure Apache configuration`_ examples.

		To secure your deployment of Diffie-Hellman, configure the following:

		1. Generate a strong Diffie-hellman group, 2048-bit or stronger.

		.. code-block:: bash

		# to generate your dhparam.pem file, run in the terminal
		openssl dhparam -out /etc/apache/ssl/dhparam.pem 2048

		2. Configure your server to only use modern, secure cipher suites in the
		virtual hosts configuration file.

		.. code-block:: apache

		# Set the protocol to only use modern, secure cipher suites.
		SSLProtocol all -SSLv2 -SSLv3
		SSLHonorCipherOrder on
		SSLCipherSuite ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA

		# Specify your DH params file as follows
		SSLOpenSSLConfCmd DHParameters "{path to dhparams.pem}"


		.. _Guide to Deploying Diffie-Hellman for TLS: https://weakdh.org/sysadmin.html
		.. _secure Apache configuration: http://www.apache-ssl.org/httpd.conf.example