48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
import contextlib
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import os
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import subprocess
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from subprocess import DEVNULL
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import tempfile
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import gssapi
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import pytest
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# map principals to GSSAPI credentials
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_cache = {}
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@contextlib.contextmanager
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def gssapi_token_ctx(principal: str):
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"""
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Temporarily set KRB5CCNAME to a ccache storing credentials
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for the specified user, and yield the GSSAPI credentials.
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"""
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old_krb5ccname = os.environ['KRB5CCNAME']
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try:
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if principal not in _cache:
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f = tempfile.NamedTemporaryFile()
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os.environ['KRB5CCNAME'] = 'FILE:' + f.name
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args = ['kinit', principal]
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if principal == 'ceod/admin':
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args = ['kinit', '-k', principal]
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subprocess.run(
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args, stdout=DEVNULL, text=True, input='krb5', check=True)
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creds = gssapi.Credentials(name=gssapi.Name(principal), usage='initiate')
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# Keep the credential cache files around as long as the creds are
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# used, otherwise we get a "Invalid credential was supplied" error
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_cache[principal] = creds, f
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else:
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creds, f = _cache[principal]
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os.environ['KRB5CCNAME'] = 'FILE:' + f.name
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yield creds.export()
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finally:
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os.environ['KRB5CCNAME'] = old_krb5ccname
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@pytest.fixture(scope='session', autouse=True)
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def ccache_cleanup():
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"""Make sure the ccache files get deleted at the end of the tests."""
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yield
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_cache.clear()
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