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Update 30_security-misc.conf

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monsieuremre 2024-07-21 11:19:32 +02:00 committed by GitHub
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58
etc/usbguard/rules.d/30_security-misc.conf
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@ -1,18 +1,46 @@
## Blacklisting is not the optimal approach to security. Normally all USB devices should be rejected (default) and only the devices you personally know and trust be whitelisted.
## If you can do this, it is recommended to do. For convenience for the majority, we do the following:
# We allow those that were plugged in before the daemon starts. Everything is blocked as the default. Following rules apply on top of this.
## Allow all USB devices with mass storage interface
# Explicitly reject any interface that is not documented and/or defined by USB.org
# Note: Most probably superfluous
reject with-interface none-of { 01:*:* 02:*:* 03:*:* 04:*:* 05:*:* 06:*:* 07:*:* 08:*:* 09:*:* 0a:*:* 0b:*:* 0d:*:* 0e:*:* 0f:*:* 10:*:* 11:*:* 12:*:* 13:*:* 14:*:* 3c:*:* dc:*:* e0:*:* ef:*:* fe:*:* ff:*:*}
### Allow all mouses and keyboards, in a sense, so the user can conveniently change them without restrating the daemon.
### Take extra measures to ensure security
# Allow only one keyboard to be connected
allow with-interface one-of { 03:00:01 03:01:01 } if !allowed-matches(with-interface one-of { 03:00:01 03:01:01 })
# Allow only one mouse to be connected
allow with-interface one-of { 03:00:02 03:01:02 } if !allowed-matches(with-interface one-of { 03:00:02 03:01:02 })
# Explicitly reject any device with a mouse/keyboard interface in combination with some other interface
# Mouses and keyboards should only have one interface for all legitimate use cases
reject with-interface all-of { 03:*:* 02:*:* }
reject with-interface all-of { 03:*:* 04:*:* }
reject with-interface all-of { 03:*:* 05:*:* }
reject with-interface all-of { 03:*:* 06:*:* }
reject with-interface all-of { 03:*:* 07:*:* }
reject with-interface all-of { 03:*:* 08:*:* }
reject with-interface all-of { 03:*:* 09:*:* }
reject with-interface all-of { 03:*:* 0a:*:* }
reject with-interface all-of { 03:*:* 0b:*:* }
reject with-interface all-of { 03:*:* 0d:*:* }
reject with-interface all-of { 03:*:* 0e:*:* }
reject with-interface all-of { 03:*:* 0f:*:* }
reject with-interface all-of { 03:*:* 10:*:* }
reject with-interface all-of { 03:*:* 11:*:* }
reject with-interface all-of { 03:*:* 12:*:* }
reject with-interface all-of { 03:*:* 13:*:* }
reject with-interface all-of { 03:*:* 14:*:* }
reject with-interface all-of { 03:*:* 3c:*:* }
reject with-interface all-of { 03:*:* dc:*:* }
reject with-interface all-of { 03:*:* e0:*:* }
reject with-interface all-of { 03:*:* ef:*:* }
reject with-interface all-of { 03:*:* fe:*:* }
reject with-interface all-of { 03:*:* ff:*:* }
# Allow USB mass storage
# If and only if the USB device only has the mass storage interface and nothing extra
# Suspicious interface combinations with mass storage are blocked
allow with-interface equals { 08:*:* }
## Reject storage devices that also have extra suspicuous interfaces.
## Like a usb storage device that also tries to behave like a keyboard.
## This is a well known type of cyber attack.
reject with-interface all-of { 08:*:* 03:00:* }
reject with-interface all-of { 08:*:* 03:01:* }
reject with-interface all-of { 08:*:* e0:*:* }
reject with-interface all-of { 08:*:* 0a:*:* }
reject with-interface all-of { 08:*:* 02:*:* }
## We do not allow anything else. Keyboards, mice, and everything else, they will be rejected. The only exception is, if they were plugged in when the daemon starts.
## If you have your keyboard plugged in before booting, it will be allowed. If you plug after the fact, you have to manually allow the device or do a restart.