Description of problem:

freeipa-client-common-4.6.90.pre2-3.fc28.noarch
freeipa-common-4.6.90.pre2-3.fc28.noarch
freeipa-client-4.6.90.pre2-3.fc28.x86_64

310225
073189


$ ipa ca-show vpn --certificate-out=/tmp/vpn
ipa: ERROR: non-public: TypeError: initializer for ctype 'char[]' must be a
bytes or list or tuple, not str
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/ipalib/backend.py", line 141, in
execute
    return self.Command[_name](*args, **options)
  File "/usr/lib/python3.6/site-packages/ipalib/frontend.py", line 450, in
__call__
    return self.__do_call(*args, **options)
  File "/usr/lib/python3.6/site-packages/ipalib/frontend.py", line 478, in
__do_call
    ret = self.run(*args, **options)
  File "/usr/lib/python3.6/site-packages/ipalib/frontend.py", line 801, in run
    return self.forward(*args, **options)
  File "/usr/lib/python3.6/site-packages/ipaclient/plugins/ca.py", line 42, in
forward
    result['result']['certificate'])
  File "/usr/lib/python3.6/site-packages/ipalib/x509.py", line 406, in
load_der_x509_certificate
    crypto_x509.load_der_x509_certificate(data, backend=default_backend())
  File "/usr/lib64/python3.6/site-packages/cryptography/x509/base.py", line 47,
in load_der_x509_certificate
    return backend.load_der_x509_certificate(data)
  File "/usr/lib64/python3.6/site-packages/cryptography/hazmat/backends/openssl
/backend.py", line 1144, in load_der_x509_certificate
    mem_bio = self._bytes_to_bio(data)
  File "/usr/lib64/python3.6/site-packages/cryptography/hazmat/backends/openssl
/backend.py", line 436, in _bytes_to_bio
    data_char_p = self._ffi.new("char[]", data)
TypeError: initializer for ctype 'char[]' must be a bytes or list or tuple, not
str
ipa: ERROR: an internal error has occurred