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Hi!  As you may know from reading our posts here, Team yaSSL is exhibiting at ARM TechCon this week.  What you may not know is that we’ve been working with ARM’s mbed.org team to facilitate a port of wolfSSL to mbed.  Why?  Because hobbyists need security too!  And it is fun. 
 
Here at ARM TechCon, mbed has paired with Pololu to create an mbed-based robot.  Additionally, these two companies have created a contest for developers to race the robots based on the program they write.  We’re going to help ensure a robot does not lose because its communication is subject to an MITM attack!

Hi!  About 20% of our users are using CTaoCrypt to provide standalone cryptographic functionality, and about 80% of our users have not thought about using it that way.  The purpose of this blog post is to inform users on how to use CTaoCrypt as a standalone library:
 
1. CTaoCrypt is available as a function set within wolfSSL, licensed under GPL or commercially.  If you are interested in using it outside of wolfSSL, then let us know.  Basically this means that 100% of the CTaoCrypt functions are available through the wolfSSL API set. 
2. Support for various development environments is included in the download, including GCC, Visual Studio, and Xcode.
3. The build process is described in the README.  A program to test your build is included.
4. If you are a benchmark junkie, and since we know you probably are, we include a simple benchmark application to get you started.
5. CTaoCrypt has a lot of useful features, including: 

– AES-NI support for super fast AES on the newer intel chips. 
– One way hash functions: SHA-1, MD2, MD4, MD5, RIPEMD-160
– Message authentication codes: HMAC
– Block Ciphers: DES, Triple-DES, AES
– Stream Ciphers: ARC4, Rabbit and HC-128
– Public Key Crypto: RSA, DSA, Diffie-Hellman
– Password based key derivation: PBKDF2 from PKCS #5
– Pseudo Random Number Generators
– Large Integer Support
– Base 16/64 encoding/decoding
– DER encoding/decoding
– X.509 processing
– x86, x86_64, SSE2, ARM, PPC32, and PPC64 and AVR32
– Support for FastMath

6. If you need porting, support, or just regular help with CTaoCrypt, then get in contact with us at info@yassl.com.

“The Register” reported on using SHODAN to pinpoint embedded devices that are not properly secured yesterday.  See http://www.theregister.co.uk/2010/11/02/scada_search_engine_warning/ for details.  In summary, SHODAN can be used to quickly identify internet connected devices with known exploits.  For us, it points to yet another reason why mobile and embedded systems developers should harden their devices with the wolfSSL embedded SSL library and the yaSSL Embedded Web Server.

Hi!  Do you need OCSP (Online Certificate Status Protocol) in wolfSSL?  Let us know.  We’re currently considering it for a feature addition to our next release.  Sometimes OCSP may be necessary to obtain timely information about the revocation status of a certificate.  OCSP solves that problem.  Additional status information is also available under the protocol.  More information on the protocol is available here:  http://www.ietf.org/rfc/rfc2560.txt.  This is not a big feature for us to add, but we’re weighing it against other development priorities.  So let us know what you think!  Send in your vote  for or against OCSP being a high priority for wolfSSL to info@yassl.com.

The yaSSL Open Source Embedded Web Server has support for CGI (Common Gateway Interface). Using CGI, a web server can communicate with other types of programs running on the server. Because the yaSSL Embedded Web Server by itself is only able to deal with HTML file, it can “pass off” scripts written in other languages to their specific interpreter, thus allowing the functionality of many CGI languages to be used. Some of the possible languages include: PHP, Perl, ASP, ASP.NET, Python, Ruby on Rails, and C.

To configure the yaSSL Embedded Web Server to process CGI scripts in a given language, the interpreter for that language must be installed on the server. As an example, we’ll walk through how you would enable PHP to be used with the yaSSL Embedded Web Server.

The first thing you would need to do would be to download PHP if it is not currently installed on your server. The PHP source can be downloaded from the following location: http://www.php.net/downloads.php. After it has been downloaded, it should be built and installed. From the php source directory, run the following commands:

./configure
make
sudo make install

On OS X, this will place the “php-cgi” program in the “/usr/local/bin” directory. Now that we have the PHP CGI interpreter, we need to let the yaSSL Web Server know where it is located. This can be done in two ways (as most options can) and be set at runtime using the -cgi_interp option, or by adding a similar line to the configuration file. We can also set the -cgi_ext option, which defines which extensions are treated as CGI scripts. Setting these option at runtime, you would start the yaSSL Embedded Web Server as follows:

./yasslEWS -cgi_ext cgi,php -cgi_interp /usr/local/bin/php-cgi

After starting the web server, you can test if PHP is working by browsing to any PHP file which is located under your web server root directory.

To download the yaSSL Embedded Web Server, or to learn more, check out http://www.yassl.com. If you have any questions, contact us at info@yassl.com.

The yaSSL Open Source Embedded Web Server supports directory aliases. Similar to Apache’s mod_alias, using aliases allows a mapping to be created between URLs and file system paths. This mapping allows content which is not under the web server Document Root to be served as part of the web document tree. In other words, URLs beginning with the url-path will be mapped to local files beginning with the directory-path.

In the yaSSL Embedded Web Server, this can be done two ways:

1) Aliases can be set at runtime by using the -aliases option
2) Aliases can be set in the config file

In the following examples, suppose we wanted to map our local video directory (/home/user/Videos) to the URL “/videos”, and we wanted to map our pictures directory (/home/user/Pictures) to the URL “/pictures”.

Using the first option (setting the aliases at runtime), would look similar to the following.

./yasslEWS -aliases /videos=/home/user/Videos,/pictures=/home/user/Pictures

Using the second option (setting the aliases through the config file), we would need to add a line to our config file, as follows:

aliases /videos=/home/user/Videos,/pictures=/home/user/Pictures

To test if the newly set-up aliases are working correctly, point your web browser to one of the two URLs, where you should see a directory listing of the local files.

http:///pictures
http:///videos

If this doesn’t work, double check that your paths are correct in your alias definitions and that everything is spelled correctly. Aliases should be able to be created for any drive physically attached to your computer.

To download the yaSSL Embedded Web Server, or to learn more, check out http://www.yassl.com. If you have any questions, contact us at info@yassl.com.

The yaSSL Open Source Embedded Web Server supports Access Control Lists. An Access Control List (ACL) allows restrictions to be put on the list of IP addresses which have access to the web server. In the case of the yaSSL Embedded Web Server, the ACL is a comma separated list of IP subnets, where each subnet is prepended by either a ‘-’ or a ‘+’ sign. A plus sign means allow, where a minus sign means deny. If a subnet mask is omitted, such as “-1.2.3.4”, this means to deny only that single IP address.

Subnet masks may vary from 0 to 32, inclusive. The default setting is to allow all, and on each request the full list is traversed – where the last match wins.

The ACL can be specified either at runtime, using the -acl option, or by using “acl” in the config file. For example, to allow only the 192.168.0.0/16 subnet to connect, you would run the following command:

./yasslEWS -acl -0.0.0.0/0,+192.168.0.0/16

The ACL can also be set in the web server config file. Using the example above, the config file line would be:

# acl -0.0.0.0/0,+192.168.0.0/16

To learn more about subnet masks, see the Wikipedia page on Subnetwork (http://en.wikipedia.org/wiki/Subnetwork), or here (http://wiki.xtronics.com/index.php/IP_Subnet_Masks).

To download the yaSSL Embedded Web Server, or to learn more, check out http://www.yassl.com. If you have any questions, contact us at info@yassl.com.

One of the features of the yaSSL Embedded Web Server is support for Server Side Includes. Server Side Includes (SSI) is a simple interpreted server-side scripting language which is most commonly used to include the contents of a file into a web page. It can be useful when it is desirable to include a common piece of code throughout a website.

Some of the ways in which Sever Side Includes may be used include:
– Including the contents of a file (html, txt, etc) into a web page
– Include the result of running a CGI script
– Executing a program, script, or shell command on the server
– Displaying the contents of a HTTP environment variable
– Outputting a list of variables and their values (environment and user-defined)

For more information on Server Side Includes, take a look at the Wikipedia entry here: http://en.wikipedia.org/wiki/Server_Side_Includes, or a tutorial on Server Side Includes can be found here: http://http-server.carleton.ca/~dmcfet/html/ssi.html.

To download the yaSSL Embedded Web Server, or to learn more, check out http://www.yassl.com. If you have any questions, contact us at info@yassl.com.

Hi! 
 
Have you checked out the yaSSL Embedded Web Server?  With SSL enabled, it is sized small enough to fit into resource constrained environments at under 200k in footprint.  However, it still has a useful feature set, including all of the standard web server functionality you would expect, plus features like support for CGI with your favorite language, including PHP, Perl, Python, Ruby on Rails, etc.  Check it out at www.yassl.com.

Team yaSSL is preparing for Halloween here in the United States with a pumpkin carving! Our embedded security products are continually evolving. We encourage you to check our our wolfSSL embedded SSL library here, or our new yaSSL Embedded Web Server, here.

As always if you have any questions, or would like more information about our products, please contact us at info@yassl.com.

Thanks,
Team yaSSL