ef6ce24a26
- make TLS session persistent: once open, you can save TLS state with tls.save() and restore it next time by calling tls.load() instad of tls.open(). State is saved in tls.dict file. - a small standalone script added which can be used to keep an open file descriptor to the device. Without it tls.load() wont work. - identify() function added - added methods to associate blobs with fingers. Windows seems to be using these blobs to save certificates for the users to establish trust with potentially removable devices (it is sort of documented in winbio specs)
40 lines
1.7 KiB
Python
40 lines
1.7 KiB
Python
# There seems to be either a bug or a feature which renders the scanner unusable if
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# there were too many attemps to establish TLS connection with it. While device
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# seems to magically fix itself after a while (8 hours?) it is extremely annoying
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# when hacking.
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#
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# It is probably not that bad if all communication is done by a single service process which
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# only initiates TLS connection once during system startup and then simply serves
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# requests via DBus, DCOM or whatever. It is not that nice when you have a
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# standalone program which you are hacking and restarting all the time.
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#
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# So, to workaround the problem I'm trying to save and restore the TLS state
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# between the prototype invocation. This works fine with one exception. As soon as
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# you close the last file descriptor associated with a USB device, the kernel automatically
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# resets the device, effectively killing the established TLS state.
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#
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# This script helps to work around this last problem. It keeps an open descriptor which
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# prevents kernel from resetting the device configuration. It does not interfere with
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# the main process and does not hold the claim on the inface. It just sits there
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# doing nothing until you decide to quit.
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#
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# The same can be achived by running something like "read 4</dev/bus/usb/001/011" from
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# a command line, but in this case you need to figure out what is the current bus/device
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# number yourself.
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import usb.core
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from usb.util import claim_interface, release_interface
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from time import sleep
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dev = usb.core.find(idVendor=0x138a, idProduct=0x0097)
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# make sure we at least opened device descriptor
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claim_interface(dev, 0)
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sleep(0.2)
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# release the iface, but keep the device open
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release_interface(dev, 0)
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# sit here, until the user press enter
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raw_input()
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