Description of problem:
In order to work with IPA and Yubikey, libyubikey is required. Right now, it
doesn't get installed by default and not available in official repo.
[root@master1 ~]# ipa -v otptoken-add-yubikey --owner=testuser1
ipa: INFO: trying https://master1.testrelm.test/ipa/session/json
ipa: ERROR: non-public: ValueError: No backend available
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/ipalib/backend.py", line 139, in
execute
    result = self.Command[_name](*args, **options)
  File "/usr/lib/python2.7/site-packages/ipalib/frontend.py", line 447, in
__call__
    return self.__do_call(*args, **options)
  File "/usr/lib/python2.7/site-packages/ipalib/frontend.py", line 475, in
__do_call
    ret = self.run(*args, **options)
  File "/usr/lib/python2.7/site-packages/ipalib/frontend.py", line 798, in run
    return self.forward(*args, **options)
  File
"/usr/lib/python2.7/site-packages/ipaclient/plugins/otptoken_yubikey.py", line
124, in forward
    yk = yubico.find_yubikey()
  File "/usr/lib/python2.7/site-packages/yubico/yubikey.py", line 229, in
find_key
    YK = YubiKeyUSBHID(debug=debug, skip=skip)
  File "/usr/lib/python2.7/site-packages/yubico/yubikey_usb_hid.py", line 165,
in __init__
    if not self._open(skip):
  File "/usr/lib/python2.7/site-packages/yubico/yubikey_usb_hid.py", line 447,
in _open
    usb_device = self._get_usb_device(skip)
  File "/usr/lib/python2.7/site-packages/yubico/yubikey_usb_hid.py", line 497,
in _get_usb_device
    find_all=True, idVendor=_YUBICO_VID)]
  File "/usr/lib/python2.7/site-packages/usb/core.py", line 864, in find
    raise ValueError('No backend available')
ValueError: No backend available
ipa: ERROR: an internal error has occurred
[root@master1 ~]# dmesg | tail -10
[ 2700.319957] usb 1-1: New USB device found, idVendor=1050, idProduct=0407
[ 2700.319961] usb 1-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[ 2700.319964] usb 1-1: Product: Yubikey 4 OTP+U2F+CCID
[ 2700.319966] usb 1-1: Manufacturer: Yubico
[ 2700.337995] input: Yubico Yubikey 4 OTP+U2F+CCID as
/devices/pci0000:00/0000:00:06.0/usb1/1-1/1-1:1.0/input/input6
[ 2700.389167] hid-generic 0003:1050:0407.0001: input,hidraw0: USB HID v1.10
Keyboard [Yubico Yubikey 4 OTP+U2F+CCID] on usb-0000:00:06.0-1/input0
[ 2700.403784] hid-generic 0003:1050:0407.0002: hiddev0,hidraw1: USB HID v1.10
Device [Yubico Yubikey 4 OTP+U2F+CCID] on usb-0000:00:06.0-1/input1
Version-Release number of selected component (if applicable):
ipa-server-4.5.0-12.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1. Install IPA server and create IPA user
2. Attach YubiKey
3. Add OTP token for user using Yubikey
Actual results:
Traceback like above.
Expected results:
OTP Token should get added.
Additional info:
After installing libyubikey package traceback disappears.