Lighttpd Advanced security

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Revision as of 14:03, 8 November 2013 by Ginjachris (talk | contribs) (Configure Lighttpd)
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For higher security Lighttpd can be configured to allow https access.

Generate Certificate and Keys

Either generate the public key and certificate and private key using openssl, or by using the ones generated by installing ACF. You don't need to do both, just do one or the other. The former method, with OpenSSL, is preferred since it gives greater control.

Generate the certificates with openssl

To generate certificates, openssl is needed.

apk add openssl

Change to the lighttpd configuration directory

cd /etc/lighttpd

With the command below the certificates are generated. A 2048 bit key is the minimum recommended at the time of writing, so we use '-newkey rsa:2048' in the command. Change to suit your needs. Answer all questions.

openssl req -newkey rsa:2048 -x509 -keyout server.pem -out server.pem -days 365 -nodes

Adjust the permissions

chmod 400 /etc/lighttpd/server.pem

Generate the certificates with acf

Install the ACF

setup-acf

Copy the generated certificate to the lighttpd configuration directory.

mv /etc/ssl/mini_httpd/server.pem /etc/lighttpd/server.pem

Adjust the permissions

chown root:root /etc/lighttpd/server.pem

chmod 400 /etc/lighttpd/server.pem

mini_http is no longer needed.

/etc/init.d/mini_httpd stop && rc-update del mini_httpd

Removing the mini_http package

apk del mini_httpd

Configure Lighttpd

The configuration of lighttpd needs to be modified.

nano /etc/lighttpd/lighttpd.conf

Uncomment this section and adjust the path so 'ssl.pemfile' points to where our cert/key pair is stored. Or copy the example below into your configuration file if you saved it to /etc/lighttpd/server.pem.

ssl.engine    = "enable"
ssl.pemfile   = "/etc/lighttpd/server.pem"

You'll also want to set the server to listen on port 443. Replace this:

server.port		= 80

with this:

server.port		= 443

Restart lighttpd

rc-service lighttpd restart

Security

To help mitigate the BEAST attack add the following to your configuration:

#### Mitigate BEAST attack:

# A stricter base cipher suite. For details see:
# http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-3389
# or
# http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3389

ssl.cipher-list = "ECDHE-RSA-AES256-SHA384:AES256-SHA256:RC4-SHA:RC4:HIGH:!MD5:!aNULL:!EDH:!AESGCM"
# Make the server prefer the order of the server side cipher suite instead of the client suite.
# This is necessary to mitigate the BEAST attack (unless you disable all non RC4 algorithms).
# This option is enabled by default, but only used if ssl.cipher-list is set.
#
ssl.honor-cipher-order = "enable"

# Mitigate CVE-2009-3555 by disabling client triggered renegotiation
# This option is enabled by default.
#
ssl.disable-client-renegotiation = "enable"
#

More details