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import subprocess
import tempfile
import pytest
keytypes = [
"rsa", "rsa-4096",
"ed25519",
"ecdsa", "ecdsa-256", "ecdsa-384", "ecdsa-521",
]
def parse_keytype(kt):
if '-' in kt:
return kt.split('-')
else:
return (kt, None)
@pytest.mark.parametrize("keytype", keytypes)
@pytest.mark.parametrize("keyformat", [None, "PEM"])
def test_from_openssh(request, tmp_path, keytype, keyformat):
"""
Convert OpenSSH to Dropbear format,
PEM and OpenSSH internal
"""
opt = request.config.option
kt, keybits = parse_keytype(keytype)
if kt == 'dss' and keyformat is None:
pytest.skip("dss doesn't support openssh format")
os_kt = kt
if os_kt == 'dss':
# OpenSSH calls it 'dsa', Dropbear calls it 'dss'
os_kt = 'dsa'
os_key = tmp_path / 'oskey1'
db_key = tmp_path / 'dbkey1'
# Generate an OpenSSH key
args = [
opt.ssh_keygen,
'-f', os_key,
'-t', os_kt,
'-N', '', # no password
]
if keybits is not None:
args += ['-b', keybits]
if keyformat:
args += ['-m', keyformat]
p = subprocess.run(args, check=True)
# Convert to dropbear format
args = [
opt.dropbearconvert,
'openssh', 'dropbear',
os_key, db_key,
]
p = subprocess.run(args, check=True)
# Compare pubkeys
args = [
opt.dropbearkey,
'-f', db_key,
'-y'
]
p = subprocess.run(args, check=True, stdout=subprocess.PIPE, text=True)
db_pubkey = p.stdout.splitlines()[1].strip()
os_pubkey = os_key.with_suffix('.pub').open().read().strip()
# we compare the whole key including comment since it currently matches
assert db_pubkey == os_pubkey
@pytest.mark.parametrize("keytype", keytypes)
def test_roundtrip(request, tmp_path, keytype):
"""
Dropbear's private key format is deterministic so
we can compare round trip conversion. (OpenSSH's
format has more variable comments and other fields).
"""
opt = request.config.option
kt, keybits = parse_keytype(keytype)
os_key = tmp_path / 'oskey1'
db_key1 = tmp_path / 'dbkey1'
db_key2 = tmp_path / 'dbkey2'
# generate a key
args = [
opt.dropbearkey,
'-t', kt,
'-f', db_key1,
]
if keybits is not None:
args += ['-s', keybits]
p = subprocess.run(args, check=True)
# convert to openssh
args = [
opt.dropbearconvert,
'dropbear', 'openssh',
db_key1, os_key,
]
p = subprocess.run(args, check=True)
# Check ssh-keygen can read it
args = [
opt.ssh_keygen,
'-f', os_key,
'-y',
]
p = subprocess.run(args, check=True, text=True, stdout=subprocess.PIPE)
os_pubkey = p.stdout.strip()
# Compare public keys
args = [
opt.dropbearkey,
'-f', db_key1,
'-y',
]
p = subprocess.run(args, check=True, text=True, stdout=subprocess.PIPE)
db_pubkey = p.stdout.splitlines()[1].strip()
# comment may differ
db_pubkey = db_pubkey.split(' ')[:2]
os_pubkey = os_pubkey.split(' ')[:2]
assert db_pubkey == os_pubkey
# convert back to dropbear
args = [
opt.dropbearconvert,
'openssh', 'dropbear',
os_key, db_key2,
]
p = subprocess.run(args, check=True)
# check the round trip is identical
assert db_key1.open('rb').read() == db_key2.open('rb').read()
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