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Library req » History » Version 30

Refik Hadzialic, 11/16/2011 02:29 PM

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h1. Library requirement
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h2. Python Library
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h3. PJSUA Library
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pjsua is an open source command line SIP user agent (softphone) that is used as the reference implementation for PJSIP, PJNATH, and PJMEDIA. Despite its simple command line appearance, it does pack many features!
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This library is used for the SIP handler. More information about this library can be found on this web site http://www.pjsip.org/pjsua.htm
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How to use the SIP library and how to install it will be explain here: [[SIP| SIP Handler]]
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h3. SSH
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Secure Shell (SSH) is a network protocol for secure data communication, remote shell services or command execution and other secure network services between two networked computers that it connects via a secure channel over an insecure network: a server (running an SSH server program) and a client (running an SSH client program).[1].
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Type the following to install it:
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<pre>
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sudo apt-get install ssh
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</pre>
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We need to configure the ssh connections to the nanoBTS controller boxes without typing the password. We can achieve this by copying the public key to the nanoBTS boxes.
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One has to create first the private and public keys on the local machine(i.e. server computer, where the test software runs):
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<pre>
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refik@ubuntu:$ [Note: You are on local-host here]
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refik@ubuntu:$ ssh-keygen
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Generating public/private rsa key pair.
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Enter file in which to save the key (/home/refik/.ssh/id_rsa):[Enter key]
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Enter passphrase (empty for no passphrase): [Press enter key]
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Enter same passphrase again: [Press enter key]
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Your identification has been saved in /home/refik/.ssh/id_rsa.
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Your public key has been saved in /home/refik/.ssh/id_rsa.pub.
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The key fingerprint is:
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33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 refik@ubuntu
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</pre>
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Then one needs to copy the public key to the remote machine (nanoBTS controller, i.e. BeagleBoard) using ssh-copy-id:
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<pre>
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refik@ubuntu:$ ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host
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refik@remote-host's password:
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Now try logging into the machine, with "ssh 'remote-host'", and check in:
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.ssh/authorized_keys
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to make sure we haven't added extra keys that you weren't expecting. 
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</pre>
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After we have created the public and private keys, and coppied the public key on the machine to which we want to connect, we can test if we can make an SSH connection to the remote machine:
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<pre>
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refik@ubuntu:$ ssh remote-host
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[Note: SSH did not ask for password.]
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refik@remote-host:$ [Note: You are on remote-host here]
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</pre>
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We created this using the guide at: http://www.thegeekstuff.com/2008/11/3-steps-to-perform-ssh-login-without-password-using-ssh-keygen-ssh-copy-id/
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h3. easy_install 
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Easy Install is a python module (easy_install) bundled with setuptools that lets you automatically download, build, install, and manage Python packages.
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<pre>
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sudo apt-get install python-setuptools python-dev build-essential
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</pre>
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h3. Setproctitle 
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The library allows a process to change its title (as displayed by system tools such as ps and top).
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Changing the title is mostly useful in multi-process systems, for example when a master process is forked: changing the children's title allows to identify the task each process is busy with.
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You can use easy_install (i.e. the module we previously installed) to install the module. To perform a system-wide installation use:
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Preferred installation procedure:
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<pre>
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sudo easy_install setproctitle
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</pre>
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Not preferred installation procedure:
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If you are an unprivileged user or you want to limit installation to a local environment, you can use the command:
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<pre>
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easy_install -d /target/path setproctitle
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</pre>
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Notice that easy_install requires /target/path to be in your PYTHONPATH.
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More information about this library can be found at http://pypi.python.org/pypi/setproctitle
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h3. Serial port library
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The serial port library is required for the cell phones to communicate with our software. The required library for Python can be installed by typing the following command (both on the server computer and the nanoBTS controller boxes i.e. BeagleBoards):
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<pre>
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sudo apt-get install python-serial
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</pre>
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h3. MySQLdb
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MySQLdb is an thread-compatible interface to the popular MySQL database server that provides the Python database API.
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 _mysql is a low-level API similiar to the MySQL C API. ZMySQLDA is a Database Adapter for Zope2.
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If you want to write applications which are portable across databases, use MySQLdb, and avoid using this module directly. _mysql provides an interface which mostly implements the MySQL C API. For more information, see the MySQL documentation. The documentation for this module is intentionally weak because you probably should use the higher-level MySQLdb module. If you really need it, use the standard MySQL docs and transliterate as necessary.
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h3. pChart library
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The pChart library is within our installation les and does not require to be installed individually. The library is only required if one uses the web interface and requires the generated resulting image. The library is open source and does not require any licensing. However, if one needs to learn how the library works, information can be found on the pChart web page http://www.pchart.net/
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h2. PhpMyadmin
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phpMyAdmin is a very famous MySQL mangement software package. To use it you should install and configure PHP, Apache and php mysql.
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The easy way to install PhpMyadmin is installing from package using Apt-get command.
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<pre>
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sudo apt-get install phpmyadmin
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</pre>
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For detailed instructions on using repositories and package managers, please go to the site: https://help.ubuntu.com/community/phpMyAdmin
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h2. MySQL Database
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MySQL is a fast, multi-threaded, multi-user, and robust SQL database server. It is intended for mission-critical, heavy-load production systems as well as for embedding into mass-deployed software.
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To install MySQL, run the following command from a terminal prompt:
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<pre>
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sudo apt-get install mysql-server
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</pre>
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During the installation process you will be prompted to enter a password for the MySQL root user.
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Once the installation is complete, the MySQL server should be started automatically. More information can be found at: https://help.ubuntu.com/11.04/serverguide/C/mysql.html
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Now you can continue with the steps written by Konrad and at the end configure the server for _https_ and _.htaccess_. 
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h1. Installation guide from Konrad
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SSH
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<pre>
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apt-get install apache
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</pre>
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Python:
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<pre>
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apt-get install python python-serial python-setuptools python-dev build-essential
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easy_install setproctitle
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</pre>
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Apache + php:
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<pre>
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apt-get install apache2 
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apt-get install libapache2-mod-php5
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a2enmod php5
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/etc/init.d/apache2 restart
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</pre>
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MySQL:
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<pre>
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apt-get install mysql-server python-mysqldb php5-mysql php5-gd
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</pre>
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PJSUA
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<pre>
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wget http://www.pjsip.org/release/1.12/pjproject-1.12.tar.bz2
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tar --bzip2 -xvf pjproject-1.12.tar.bz2
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./configure && make dep && make
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cd pjsip-apps/src/python/
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make 
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sudo make install
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</pre>
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Webserver-Config: 
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(TODO)
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see Report page 30 ff.
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Database preparation:
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<pre>
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mysql -u root -p -h localhost
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create databas gsmselftesting;
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use mysql;
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GRANT ALL PRIVILEGES ON gsmselftesting.* TO 'selftest'@'localhost' IDENTIFIED BY 'some_pass' WITH GRANT OPTION;
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mysql -u selftest -p -h localhost -D gsmselftesting < gsmselftesting.sql
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mysql -u selftest -p -h localhost -D gsmselftesting < InsertData.sql
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</pre>
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Change mysql login credentials in the code:
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<pre>
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vim Code/Server-Code/DbClass.py
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</pre>
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Chnage mysql login credentials in the website:
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<pre>
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vim /var/www-ssl/gsm-selftest/dbconnection.php
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</pre>
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Running the System:
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<pre>
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export DISPLAY=:0.0
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./startSoftware.py
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</pre>
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<pre>
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https://132.230.8.115
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</pre>
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h1. Configuring the web server to handle https and .htaccess files
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h2. HTTPS
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First we want to generate a server key by typing the following command:
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<pre>
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openssl genrsa −des3 −out server.key 4096
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</pre>
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This will generate a 4096 bit long private server key, one is asked to enter two times a password for the _server.key_. Using the generated private server key, we will create a certificate signing request, _server.csr_. We were prompted with a series of questions like country, state, organization name and etc which we had to enter to resume.
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<pre>
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openssl req -new -key server.key -out server.csr 
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</pre>
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In the next step we had to sign the certificate signing request and enter the amount of days for how long it should be valid. In our case we entered the duration of one year, one can make it for longer periods as well (i.e. the amount of 365 has to be changed).
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<pre>
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openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt
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</pre>
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We were asked to enter the password again for _server.key_. After we have completed this step we had to make a version of the _server.key_ which did not require a password, _server.key.insecure_ and we will rename the files appropriately. 
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<pre>
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openssl rsa -in server.key -out server.key.insecure
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mv server.key server.key.secure
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mv server.key.insecure server.key
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</pre>
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The generated files are very sensitive, since they are our keys. After these steps were completed, we had generated 4 files: _server.crt_, _server.csr_, _server.key_ and _server.key.secure_. Now we need to enable the SSL engine on the Apache web server. We copied _server.key_ and _server.crt_ into _/etc/appache2/ssl_. 
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<pre>
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refik@ubuntu:/etc/apache2$ sudo mkdir ssl
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cp server.key /etc/apache2/ssl
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cp server.crt /etc/apache2/ssl
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</pre>
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Then we enabled SSL by typing in _a2enmod ssl_, "it is simply a general purpose utility to establish a symlink between a module in _/etc/apache2/mods-available_ to _/etc/apache2/mods-enabled_ (or give a message to the effect that a given module does not exist or that it is already symlink-ed for loading)".
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<pre>
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refik@ubuntu:/etc/apache2/ssl$ sudo a2enmod ssl
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Enabling module ssl.
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See /usr/share/doc/apache2.2-common/README.Debian.gz on how to configure SSL and create self-signed certificates.
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Run '/etc/init.d/apache2 restart' to activate new configuration!
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</pre>
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In the next procedure we had to establish a symlink from the 'available' default-ssl file to the 'enabled' file. Then we created a folder where our secured PHP files will be located (e.g. https://some-domain-name.com/test-software).
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<pre>
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refik@ubuntu:/etc/apache2/ssl$ sudo ln -s /etc/apache2/sites-available/default-ssl /etc/apache2/sites-enabled/000-default-ssl 
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refik@ubuntu:/etc/apache2/ssl$ cd /var/
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refik@ubuntu:/var$ sudo mkdir www-ssl
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</pre>
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We had backed up our old configuration files for the virtual hosts, for the case if we damage the Apache configuration files. Then we edited the _default-ssl_ file.
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<pre>
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refik@ubuntu:/var$ cd /etc/apache2/sites-available
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refik@ubuntu:/etc/apache2/sites-available$ sudo cp default default_original
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refik@ubuntu:/etc/apache2/sites-available$ sudo cp default-ssl default-ssl_original
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refik@ubuntu:/etc/apache2/sites-available$ sudo vim default-ssl
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</pre>
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Only the beginning of the file is listed here and we have modified the line starting with _DocumentRoot_ and _<Directory /var/www/>_ from _DocumentRoot /var/www_ to _DocumentRoot /var/www-ssl_ and from _<Directory /var/www/>_ to _<Directory /var/www-ssl/>_ (i.e. we had to redefine the location of our SSL directory).
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<pre>
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<IfModule mod_ssl.c>
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<VirtualHost _default_:443>
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        ServerAdmin webmaster@localhost
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        DocumentRoot /var/www-ssl
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        <Directory />
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                Options FollowSymLinks
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                AllowOverride None
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        </Directory>
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        <Directory /var/www-ssl/>
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                Options Indexes FollowSymLinks MultiViews
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                AllowOverride None
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                Order allow,deny
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                allow from all
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        </Directory>
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</pre>
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One should keep in mind that the port 443 should be free for Apache to use it. In the proceeding step we had to ensure that Apache listens on the given port for a _https_ connection. One could test that by going into the _/etc/apache2/ports.conf_.
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<pre>
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<IfModule mod_ssl.c>
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    # If you add NameVirtualHost *:443 here, you will also have to change
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    # the VirtualHost statement in /etc/apache2/sites-available/default-ssl
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    # to <VirtualHost *:443>
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    # Server Name Indication for SSL named virtual hosts is currently not
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    # supported by MSIE on Windows XP.
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    Listen 443
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</IfModule>
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</pre>
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In our case it was set up correctly, since the command: _Listen 443_ was present. In our last configuration step we had to edit _default-ssl_ file to define the correct locations of our keys and to ensure the SSL engine was turned on.
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<pre>
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refik@ubuntu:/etc/apache2/sites-available$ sudo vim default-ssl
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</pre>
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The following part of the file had to be found and modified according to our key path locations:
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<pre>
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SSLEngine on
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       #   A self-signed (snakeoil) certificate can be created by installing
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       #   the ssl-cert package. See
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       #   /usr/share/doc/apache2.2-common/README.Debian.gz for more info.
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       #   If both key and certificate are stored in the same file, only the
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       #   SSLCertificateFile directive is needed.
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       SSLCertificateFile    /etc/apache2/ssl/server.crt
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       SSLCertificateKeyFile /etc/apache2/ssl/server.key
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       #   Server Certificate Chain:
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       #   Point SSLCertificateChainFile at a file containing the
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</pre>
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Finally we had configured our server and can proceed with the restart of the apache web server. We created a test web site _/var/www-ssl/index.php_ and navigated our browser to _https://localhost_. The test was successful! 
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<pre>
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refik@ubuntu:/etc/apache2/sites-available$ sudo /etc/init.d/apache2 restart
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 * Restarting web server apache2                                                                                                                                        [Sat Oct 08 21:52:51 2011] [warn] _default_ VirtualHost overlap on port 443, the first has precedence
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 ... waiting [Sat Oct 08 21:52:52 2011] [warn] _default_ VirtualHost overlap on port 443, the first has precedence [ OK ]
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refik@ubuntu:/etc/apache2/sites-available$
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</pre>
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h2. Configuring the password protection for the web site (using .htaccess)
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However, to enable the use of Apache _.htaccess_ files, we will have to reconfigure the Apache configuration files again. _root_ access will be required. First we have to edit the _/etc/apache2/sites-available/default-ssl_ file. Find the following lines and modify the _AllowOverride None_ to _AllowOverride All_
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like in the given configuration segment:
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<pre>
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        <Directory /var/www-ssl/>
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                Options Indexes FollowSymLinks MultiViews
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                AllowOverride All
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                Order allow,deny
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                allow from all
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        </Directory>
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</pre>
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This will tell Apache web server that it is okay to allow _.htaccess_ files to over-ride previous directives. We must reload the Apache web server before the changes can take effect. We can do it by typing:
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<pre>
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sudo /etc/init.d/apache2 reload
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</pre>
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The next step is to go to the directory where our test software web page is located (e.g. _/var/www-ssl/testsoftware_) and to create a file called _.htaccess_.
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Please insert the following code segment inside the created _.htaccess_ file where _/var/www-ssl/testsoftware/.htpasswd_ is your full path address to _.htpasswd_:
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<pre>
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AuthUserFile /var/www-ssl/testsoftware/.htpasswd
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AuthName "Authorization Required"
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AuthType Basic
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require valid-user 
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</pre>
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Then in the next step, create another file called _.htpasswd_. After you have created it, we will add the usernames that should have access to the web site. We do that by typing the following command, where you can replace _konrad_ with any other combination of letters which will represent your username:
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<pre>
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refik@ubuntu:/var/www-ssl/testsoftware$ sudo htpasswd -c .htpasswd konrad
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</pre>
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Afterwards, you will be required to type twice the same password for the username you want to create, in this case _konrad_. "The -c flag is used only when you 
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are creating a new file. After the first time, you will omit the -c flag, when you are adding new users to an already-existing password file. Otherwise you will overwrite the file!". You can add as many users as you wish, do not forget to remove the -c flag when you do it. In the last step, we have to modify the _/etc/apache2/apache2.conf_ file and to add at the end of it the following code segment where _/vaw/www-ssl/testsoftware_ is the full path to your web page directory where you put the _.htpasswd_ file:
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<pre>
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<Directory /vaw/www-ssl/testsoftware>
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AllowOverride All
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</Directory>
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</pre>
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We are done with editing. All we have to do now is to restart the Apache web server. We
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can do that by typing:
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<pre>
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sudo /etc/init.d/apache2 restart
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</pre>
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You can test it now by opening a new browser tab and navigating to _https://localhost/testsoftware_ (keep in mind to replace _testsoftware_ with your name of the folder where the web page is located). If you configured everything properly, you should get a dialog where you can enter your created username and password and try to login.