Create a simple spamassassin rule to catch words

Not so often we need to write our custom rules for fighting against spam, but sometimes we need it, because a spammer just wanted to target specifically our server or clients. If you use spamassassin here what you can do to create a simple rule to find words and rate the message with a desired score, which will (probably) mark it as a spam.
The template is as follows:

  • headers search, the example template is for the Subject header, but you could any other header name.
    header <RULENAME> Subject =~ /word1, word2, word3, ..., wordN/
    score <RULENAME> <score>
    describe <RULENAME> <description>
    
  • body search
    body <RULENAME> /word1, word2, word3, ..., wordN/
    score <RULENAME> <score>
    describe <RULENAME> <description>
    

Set these 3 lines (or the 6 above for the headers and body) in your user_prefs.cf file, which is probably here:

  • /etc/mail/spamassassin/local.cf – CentOS 7
  • /etc/spamassassin/ – Ubuntu 16/17, Gentoo
  • ~/.spamassassin/user_prefs.cf – custom file per user

Here is example of the rules:

header CONTAINS_VIG Subject =~ /apple, orange/
score CONTAINS_VIG 1.5
describe CONTAINS_VIG Bad Word fruits in the Subject
body CONTAINS_PEN /apple, orange/
score CONTAINS_PEN 1.5
describe CONTAINS_PEN Bad Word in the Body

Catch messages in the Subject and body containing apple and orange and add to the scoring system 1.5, for your purses you may need to increase the scoring drastically it depends on your required score for spam (check for it in local.cf).

* Update

As of Rob Morin proposed in the comments it is a good idea to add “/i” to catch lower and capital letters (“ignore case”) like this:

header CONTAINS_VIG Subject =~ /apple, orange/i
score CONTAINS_VIG 1.5
describe CONTAINS_VIG Bad Word fruits in the Subject
body CONTAINS_PEN /apple, orange/i
score CONTAINS_PEN 1.5
describe CONTAINS_PEN Bad Word in the Body

xmr-stak GPU disabled after kernel or driver updated

Sometime when the user upgrades the kernel or the graphic card driver (NVIDIA or ATI) under Ubuntu (it is essentially the same with the other distros) we may encounter errors with xmr-stak and even not to be able to use our graphic card for mining!
Here we have an UBUNTU 17.10.1 and when we updated the kernel to the latest our mining xmr-stak software stopped using the NVIDIA card:

-------------------------------------------------------------------
[2018-02-16 12:17:11] : Start mining: MONERO
WARNING: NVIDIA Insufficient driver!
WARNING: NVIDIA no device found
[2018-02-16 12:17:11] : WARNING: backend NVIDIA disabled.
[2018-02-16 12:17:11] : WARNING: UNKNOWN_ERROR when calling clGetPlatformIDs for number of platforms.
[2018-02-16 12:17:11] : WARNING: No OpenCL platform found.
[2018-02-16 12:17:11] : WARNING: No AMD OpenCL platform found. Possible driver issues or wrong vendor driver.
[2018-02-16 12:17:11] : WARNING: backend AMD disabled.
[2018-02-16 12:17:11] : Starting 1x thread, affinity: 0.
[2018-02-16 12:17:11] : hwloc: memory pinned

As you can see the NVIDIA backend is disabled! In fact the driver seemed OK and loaded and even the X was working.
So in such a situation just reinstall the NVIDIA driver and install the software dependecies for the mining xmr-software (detailed explanation here)
Here what you can do:

sudo apt-get purge nvidia-*
sudo apt-get -y install libboost-all-dev libleveldb-dev libcurl4-openssl-dev libmicrohttpd-dev libminiupnpc-dev libgmp-dev  cuda nvidia-opencl-dev libmicrohttpd-dev libssl-dev cmake build-essential
sudo reboot

And you’ll have again an usable and properly installed GPU mining system.

Here is the log of the reinstallation, check it if you think you are going in the wrong direction, when purging the driver:

root@srv2:~/xmr-stak/build/bin# apt-get purge nvidia-*
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  bbswitch-dkms cuda-command-line-tools-9-1 cuda-compiler-9-1 cuda-cublas-9-1 cuda-cublas-dev-9-1 cuda-cudart-9-1 cuda-cudart-dev-9-1 cuda-cufft-9-1 cuda-cufft-dev-9-1
  cuda-cuobjdump-9-1 cuda-cupti-9-1 cuda-curand-9-1 cuda-curand-dev-9-1 cuda-cusolver-9-1 cuda-cusolver-dev-9-1 cuda-cusparse-9-1 cuda-cusparse-dev-9-1
  cuda-documentation-9-1 cuda-driver-dev-9-1 cuda-gdb-9-1 cuda-gpu-library-advisor-9-1 cuda-libraries-9-1 cuda-libraries-dev-9-1 cuda-license-9-1 cuda-memcheck-9-1
  cuda-misc-headers-9-1 cuda-npp-9-1 cuda-npp-dev-9-1 cuda-nsight-9-1 cuda-nvcc-9-1 cuda-nvdisasm-9-1 cuda-nvgraph-9-1 cuda-nvgraph-dev-9-1 cuda-nvml-dev-9-1
  cuda-nvprof-9-1 cuda-nvprune-9-1 cuda-nvrtc-9-1 cuda-nvrtc-dev-9-1 cuda-nvtx-9-1 cuda-nvvp-9-1 cuda-samples-9-1 cuda-toolkit-9-1 cuda-tools-9-1 cuda-visual-tools-9-1
  dkms freeglut3 freeglut3-dev lib32gcc1 libc6-i386 libglu1-mesa-dev libice-dev libsm-dev libvdpau1 libxi-dev libxmu-dev libxmu-headers libxnvctrl0 libxt-dev
  linux-headers-4.13.0-21 linux-headers-4.13.0-21-generic linux-image-4.13.0-21-generic linux-image-extra-4.13.0-21-generic linux-signed-image-4.13.0-21-generic
  linux-signed-image-4.13.0-31-generic mesa-vdpau-drivers nvidia-modprobe nvidia-prime nvidia-settings screen-resolution-extra vdpau-driver-all
Use 'apt autoremove' to remove them.
The following packages will be REMOVED:
  cuda* cuda-9-1* cuda-demo-suite-9-1* cuda-drivers* cuda-runtime-9-1* libcuda1-390* nvidia-390* nvidia-390-dev* nvidia-opencl-icd-390*
0 upgraded, 0 newly installed, 9 to remove and 14 not upgraded.
After this operation, 369 MB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 311518 files and directories currently installed.)
Removing cuda (9.1.85-1) ...
Removing cuda-9-1 (9.1.85-1) ...
Removing cuda-demo-suite-9-1 (9.1.85-1) ...
Removing cuda-runtime-9-1 (9.1.85-1) ...
Removing cuda-drivers (390.12-1) ...
Removing libcuda1-390 (390.25-0ubuntu0~gpu17.10.1) ...
Removing nvidia-opencl-icd-390 (390.25-0ubuntu0~gpu17.10.1) ...
Removing nvidia-390-dev (390.25-0ubuntu0~gpu17.10.1) ...
Removing nvidia-390 (390.30-0ubuntu1) ...
Removing all DKMS Modules
Done.
update-alternatives: using /usr/lib/nvidia-390-prime/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf (x86_64-linux-gnu_gl_conf) in auto mode
update-alternatives: using /usr/lib/nvidia-390-prime/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf (x86_64-linux-gnu_egl_conf) in auto mode
update-alternatives: using /usr/lib/nvidia-390-prime/alt_ld.so.conf to provide /etc/ld.so.conf.d/i386-linux-gnu_GL.conf (i386-linux-gnu_gl_conf) in auto mode
update-alternatives: using /usr/lib/nvidia-390-prime/alt_ld.so.conf to provide /etc/ld.so.conf.d/i386-linux-gnu_EGL.conf (i386-linux-gnu_egl_conf) in auto mode
update-alternatives: using /usr/lib/x86_64-linux-gnu/mesa/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf (x86_64-linux-gnu_gl_conf) in auto mode
update-alternatives: using /usr/lib/x86_64-linux-gnu/mesa-egl/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf (x86_64-linux-gnu_egl_conf) in auto mode
INFO:Disable nvidia-390
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.125ubuntu12) ...
update-initramfs: Generating /boot/initrd.img-4.15.3-041503-generic
cryptsetup: WARNING: target cryptswap1 has a random key, skipped
Processing triggers for libc-bin (2.26-0ubuntu2.1) ...
Processing triggers for man-db (2.7.6.1-2) ...
(Reading database ... 310876 files and directories currently installed.)
Purging configuration files for nvidia-opencl-icd-390 (390.25-0ubuntu0~gpu17.10.1) ...
Purging configuration files for nvidia-390 (390.30-0ubuntu1) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for initramfs-tools (0.125ubuntu12) ...
update-initramfs: Generating /boot/initrd.img-4.15.3-041503-generic
cryptsetup: WARNING: target cryptswap1 has a random key, skipped
root@srv2:~/xmr-stak/build/bin# apt-get -y install libboost-all-dev libleveldb-dev libcurl4-openssl-dev libmicrohttpd-dev libminiupnpc-dev libgmp-dev  cuda nvidia-opencl-dev libmicrohttpd-dev libssl-dev cmake build-essential
Reading package lists... Done
Building dependency tree       
Reading state information... Done
build-essential is already the newest version (12.4ubuntu1).
cmake is already the newest version (3.9.1-1).
libgmp-dev is already the newest version (2:6.1.2+dfsg-1).
libleveldb-dev is already the newest version (1.20-1).
libboost-all-dev is already the newest version (1.62.0.1).
libmicrohttpd-dev is already the newest version (0.9.55-1).
nvidia-opencl-dev is already the newest version (8.0.61-1).
libcurl4-openssl-dev is already the newest version (7.55.1-1ubuntu2.3).
libminiupnpc-dev is already the newest version (1.9.20140610-4ubuntu1.1).
libssl-dev is already the newest version (1.0.2g-1ubuntu13.3).
The following packages were automatically installed and are no longer required:
  linux-headers-4.13.0-21 linux-headers-4.13.0-21-generic linux-image-4.13.0-21-generic linux-image-extra-4.13.0-21-generic linux-signed-image-4.13.0-21-generic
  linux-signed-image-4.13.0-31-generic
Use 'apt autoremove' to remove them.
The following NEW packages will be installed:
  cuda cuda-9-1 cuda-demo-suite-9-1 cuda-drivers cuda-runtime-9-1 libcuda1-390 nvidia-390 nvidia-390-dev nvidia-opencl-icd-390
The following packages will be upgraded:
  nvidia-modprobe nvidia-settings
2 upgraded, 9 newly installed, 0 to remove and 12 not upgraded.
Need to get 3948 kB/88,1 MB of archives.
After this operation, 369 MB of additional disk space will be used.
Get:1 http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1704/x86_64  cuda-runtime-9-1 9.1.85-1 [2534 B]
Get:2 http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1704/x86_64  cuda-demo-suite-9-1 9.1.85-1 [3943 kB]
Get:3 http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1704/x86_64  cuda-9-1 9.1.85-1 [2560 B]
Fetched 3948 kB in 3s (1003 kB/s)  
Selecting previously unselected package nvidia-390.
(Reading database ... 310871 files and directories currently installed.)
Preparing to unpack .../00-nvidia-390_390.30-0ubuntu1_amd64.deb ...
Unpacking nvidia-390 (390.30-0ubuntu1) ...
Selecting previously unselected package nvidia-390-dev.
Preparing to unpack .../01-nvidia-390-dev_390.30-0ubuntu1_amd64.deb ...
Unpacking nvidia-390-dev (390.30-0ubuntu1) ...
Selecting previously unselected package libcuda1-390.
Preparing to unpack .../02-libcuda1-390_390.30-0ubuntu1_amd64.deb ...
Unpacking libcuda1-390 (390.30-0ubuntu1) ...
Preparing to unpack .../03-nvidia-modprobe_390.30-0ubuntu1_amd64.deb ...
Unpacking nvidia-modprobe (390.30-0ubuntu1) over (390.12-0ubuntu1) ...
Preparing to unpack .../04-nvidia-settings_390.30-0ubuntu1_amd64.deb ...
Unpacking nvidia-settings (390.30-0ubuntu1) over (390.25-0ubuntu0~gpu17.10.1) ...
Selecting previously unselected package nvidia-opencl-icd-390.
Preparing to unpack .../05-nvidia-opencl-icd-390_390.30-0ubuntu1_amd64.deb ...
Unpacking nvidia-opencl-icd-390 (390.30-0ubuntu1) ...
Selecting previously unselected package cuda-drivers.
Preparing to unpack .../06-cuda-drivers_390.30-1_amd64.deb ...
Unpacking cuda-drivers (390.30-1) ...
Selecting previously unselected package cuda-runtime-9-1.
Preparing to unpack .../07-cuda-runtime-9-1_9.1.85-1_amd64.deb ...
Unpacking cuda-runtime-9-1 (9.1.85-1) ...
Selecting previously unselected package cuda-demo-suite-9-1.
Preparing to unpack .../08-cuda-demo-suite-9-1_9.1.85-1_amd64.deb ...
Unpacking cuda-demo-suite-9-1 (9.1.85-1) ...
Selecting previously unselected package cuda-9-1.
Preparing to unpack .../09-cuda-9-1_9.1.85-1_amd64.deb ...
Unpacking cuda-9-1 (9.1.85-1) ...
Selecting previously unselected package cuda.
Preparing to unpack .../10-cuda_9.1.85-1_amd64.deb ...
Unpacking cuda (9.1.85-1) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Processing triggers for ureadahead (0.100.0-20) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3) ...
Setting up nvidia-390 (390.30-0ubuntu1) ...
update-alternatives: using /usr/lib/nvidia-390/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_GL.conf (x86_64-linux-gnu_gl_conf) in auto mode
update-alternatives: warning: skip creation of /usr/share/grub-gfxpayload-lists/blacklist/10_proprietary-graphics-drivers because associated file /usr/share/nvidia-390/nvidia-390.grub-gfxpayload (of link group x86_64-linux-gnu_gl_conf) doesn't exist
update-alternatives: using /usr/lib/nvidia-390/ld.so.conf to provide /etc/ld.so.conf.d/x86_64-linux-gnu_EGL.conf (x86_64-linux-gnu_egl_conf) in auto mode
update-alternatives: using /usr/lib/nvidia-390/alt_ld.so.conf to provide /etc/ld.so.conf.d/i386-linux-gnu_GL.conf (i386-linux-gnu_gl_conf) in auto mode
update-alternatives: using /usr/lib/nvidia-390/alt_ld.so.conf to provide /etc/ld.so.conf.d/i386-linux-gnu_EGL.conf (i386-linux-gnu_egl_conf) in auto mode
update-alternatives: using /usr/share/nvidia-390/glamor.conf to provide /usr/share/X11/xorg.conf.d/glamoregl.conf (glamor_conf) in auto mode
dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
dpkg: error: version '-' has bad syntax: revision number is empty
update-initramfs: deferring update (trigger activated)

A modprobe blacklist file has been created at /etc/modprobe.d to prevent Nouveau from loading. This can be reverted by deleting /etc/modprobe.d/nvidia-graphics-drivers.conf.
A new initrd image has also been created. To revert, please replace /boot/initrd-4.15.3-041503-generic with /boot/initrd-$(uname -r)-backup.

*****************************************************************************
*** Reboot your computer and verify that the NVIDIA graphics driver can   ***
*** be loaded.                                                            ***
*****************************************************************************

INFO:Enable nvidia-390
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/put_your_quirks_here
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/dell_latitude
DEBUG:Parsing /usr/share/ubuntu-drivers-common/quirks/lenovo_thinkpad
Adding system user `nvidia-persistenced' (UID 123) ...
Adding new group `nvidia-persistenced' (GID 129) ...
Adding new user `nvidia-persistenced' (UID 123) with group `nvidia-persistenced' ...
Not creating home directory `/'.
Loading new nvidia-390-390.30 DKMS files...
Building for 4.15.3-041503-generic
Building for architecture x86_64
Building initial module for 4.15.3-041503-generic
Done.

nvidia_390:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.3-041503-generic/updates/dkms/

nvidia_390_modeset.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.3-041503-generic/updates/dkms/

nvidia_390_drm.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.3-041503-generic/updates/dkms/

nvidia_390_uvm.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.15.3-041503-generic/updates/dkms/

depmod...

DKMS: install completed.
Setting up nvidia-390-dev (390.30-0ubuntu1) ...
Setting up nvidia-settings (390.30-0ubuntu1) ...
Processing triggers for libc-bin (2.26-0ubuntu2.1) ...
Setting up nvidia-modprobe (390.30-0ubuntu1) ...
Processing triggers for man-db (2.7.6.1-2) ...
Processing triggers for gnome-menus (3.13.3-6ubuntu5) ...
Setting up nvidia-opencl-icd-390 (390.30-0ubuntu1) ...
Setting up libcuda1-390 (390.30-0ubuntu1) ...
Setting up cuda-drivers (390.30-1) ...
Setting up cuda-runtime-9-1 (9.1.85-1) ...
Setting up cuda-demo-suite-9-1 (9.1.85-1) ...
Setting up cuda-9-1 (9.1.85-1) ...
Setting up cuda (9.1.85-1) ...
Processing triggers for initramfs-tools (0.125ubuntu12) ...
update-initramfs: Generating /boot/initrd.img-4.15.3-041503-generic
cryptsetup: WARNING: target cryptswap1 has a random key, skipped
Processing triggers for shim-signed (1.33.1~17.10.1+13-0ubuntu2) ...
Secure Boot not enabled on this system.
Processing triggers for libc-bin (2.26-0ubuntu2.1) ...
root@srv2:~/xmr-stak/build/bin#

GNU Screen with scrolling history under X window system

Screen program is really a good piece of software for every one in the console. We use it every day to execute programs in the “background” or if we want to end our ssh session to the server without stopping our executed program. We need a tiny configuration to use our favorite scrolling of the console program under the X windowing systems!

So if you are under let’s say KDE or Gnome (especially Ubuntu and CentOS) and use konsole or xterm and you want to be able to scroll the history of your ssh sessions, when you start something under gnu screen you must set the following file at your home directory

/home/<your_user>/.screenrc

with this configuration:

termcapinfo xterm* ti@:te@