35 lines
974 B
Python
35 lines
974 B
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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# map principals to files storing credentials
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_ccaches = {}
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@contextlib.contextmanager
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def krb5ccname_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.
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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 _ccaches:
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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',
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check=True)
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_ccaches[principal] = f
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else:
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os.environ['KRB5CCNAME'] = 'FILE:' + _ccaches[principal].name
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yield
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finally:
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os.environ['KRB5CCNAME'] = old_krb5ccname
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