In the past years credential theft has become a common theme among web sites. They all stem from a compromise of the web or application server or unrelated other infrastructure. Once access to the file system of the database server is achieved or the database can be accessed using the application’s credentials, the stored secret credentials the user configured, and potentially shares with other sites, can be retrieved from the database. As soon as the intrusion is detected, responsible web site owners usually notify the users about the breach and ask them to change their credentials to the website and warn about credentials reuse. Having a breach is obviously bad publicity and evidently has negative consequences.
However, at least one of the attack avenues can be sealed off: Retrieving of the secret data from the database using the credentials of the web application
Continue reading “Protecting databases against credentials theft”
Assuming syslog guarantees message deliver is a common pitfall.
Neither syslog over TCP nor syslog over UDP implement any application layer confirmation of the receipt of any log messages. If anything occurs between the writing to the buffer or the sending of the log over the socket and the logs having been written to the disk on the receiver, those logs are permanently lost.
Continue reading “Syslog is unreliable – Use RELP instead”
Here’s an example line for default.pa or similiar, or for running using pacmd. I haven’t tested it, but pulseaudio accepts this line just fine:
load-module module-echo-cancel use_master_format=1 aec_method=webrtc use_volume_sharing=1 aec_args=”analog_gain_control=0 digital_gain_control=1 beamforming=1 mic_geometry=-0.04,0,0,0.04,0,0 target_direction=4.71238898,0,0″ source_master=alsa_input.usb-046d_0821_FDA941A0-00.analog-stereo sink_master=alsa_output.pci-0000_43_00.1.hdmi-stereo-extra3 source_name=echoCancel_source sink_name=echoCancel_sink
Needs LC_NUMERIC=C in environment to be able to correctly read the mic_geometry. Using commas instead of periods doesn’t work.
if you use systemd, just use a drop-in (e.g. create one using systemctl edit)
What is it?
iptables is a cli frontend to netfilter, the Linux kernel firewall/nat implementation for OSI layer 3 and 4.
Continue reading “A quick run down on iptables rules”
Just some standards for writing applications I came up with to make it easy to deal with, fast and provide a high level of availability.
Continue reading “Programming Standards”