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Provide passphrase using SSH_ASKPASS

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This commit is contained in:
Pavel Panteleev 2022-04-27 14:21:59 +04:00
parent 3d4c3ad201
commit ff5258af6a
1 changed files with 9 additions and 31 deletions
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40
bw_add_sshkeys.py
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@ -215,12 +215,12 @@ def ssh_add(session: str, item_id: str, key_id: str, key_pw: str) -> None:
universal_newlines=True,
check=True,
)
ssh_encrypted_key = proc_attachment.stdout
ssh_key = proc_attachment.stdout
if key_pw:
ssh_key = decript_key(ssh_encrypted_key, key_pw)
envdict = dict(os.environ, DISPLAY="1", SSH_ASKPASS=os.path.realpath(__file__), SSH_KEY_PASSPHRASE=key_pw)
else:
ssh_key = ssh_encrypted_key
envdict = dict(os.environ, SSH_ASKPASS_REQUIRE="never")
logging.debug("Running ssh-add")
# CAVEAT: `ssh-add` provides no useful output, even with maximum verbosity
@ -228,35 +228,10 @@ def ssh_add(session: str, item_id: str, key_id: str, key_pw: str) -> None:
['ssh-add', '-'],
input=ssh_key,
# Works even if ssh-askpass is not installed
env=dict(os.environ, SSH_ASKPASS_REQUIRE="never"),
env=envdict,
universal_newlines=True,
check=True,
)
def decript_key(encrypted_key: str, key_pw: str) -> str:
logging.debug("Trying to open key with paramiko")
import paramiko
from io import StringIO
ssh_encrypted_key = StringIO(encrypted_key)
# Iterating over possible key types
for pkey_class in (paramiko.RSAKey, paramiko.DSSKey, paramiko.ECDSAKey, paramiko.Ed25519Key):
try:
key = pkey_class.from_private_key(ssh_encrypted_key, key_pw)
logging.debug("Writing decripted key in buffer")
ssh_key = StringIO()
key.write_private_key(ssh_key)
ssh_key.seek(0)
return ssh_key.read()
except Exception as e:
saved_exception = e
if saved_exception is not None:
raise saved_exception
)
if __name__ == '__main__':
@ -325,4 +300,7 @@ if __name__ == '__main__':
logging.error('`%s` error: %s', error.cmd[0], error.stderr)
logging.debug('Error running %s', error.cmd)
main()
if os.environ.get('SSH_ASKPASS'):
print(os.environ.get('SSH_KEY_PASSPHRASE'))
else:
main()