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from io import StringIO
import paramiko
import pytest
from paramiko.ssh_exception import SSHException
from tests.integration_tests.clouds import ImageSpecification
from tests.integration_tests.instances import IntegrationInstance
from tests.integration_tests.util import get_test_rsa_keypair
TEST_USER1_KEYS = get_test_rsa_keypair("test1")
TEST_USER2_KEYS = get_test_rsa_keypair("test2")
TEST_DEFAULT_KEYS = get_test_rsa_keypair("test3")
_USERDATA = """\
#cloud-config
bootcmd:
- {bootcmd}
ssh_authorized_keys:
- {default}
users:
- default
- name: test_user1
ssh_authorized_keys:
- {user1}
- name: test_user2
ssh_authorized_keys:
- {user2}
""".format(
bootcmd="{bootcmd}",
default=TEST_DEFAULT_KEYS.public_key,
user1=TEST_USER1_KEYS.public_key,
user2=TEST_USER2_KEYS.public_key,
)
def common_verify(client, expected_keys):
for user, filename, keys in expected_keys:
# Ensure key is in the key file
contents = client.read_from_file(filename)
if user in ["ubuntu", "root"]:
lines = contents.split("\n")
if user == "root":
# Our personal public key gets added by pycloudlib in
# addition to the default `ssh_authorized_keys`
assert len(lines) == 2
else:
# Clouds will insert the keys we've added to our accounts
# or for our launches
assert len(lines) >= 2
assert keys.public_key.strip() in contents
else:
assert contents.strip() == keys.public_key.strip()
# Ensure we can actually connect
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
paramiko_key = paramiko.RSAKey.from_private_key(
StringIO(keys.private_key)
)
# Will fail with AuthenticationException if
# we cannot connect
ssh.connect(
client.instance.ip,
username=user,
pkey=paramiko_key,
look_for_keys=False,
allow_agent=False,
)
# Ensure other uses can't connect using our key
other_users = [u[0] for u in expected_keys if u[2] != keys]
for other_user in other_users:
with pytest.raises(SSHException):
print(
"trying to connect as {} with key from {}".format(
other_user, user
)
)
ssh.connect(
client.instance.ip,
username=other_user,
pkey=paramiko_key,
look_for_keys=False,
allow_agent=False,
)
# Ensure we haven't messed with any /home permissions
# See LP: #1940233
home_dir = "/home/{}".format(user)
# Home permissions aren't consistent between releases. On ubuntu
# this can change to 750 once focal is unsupported.
if ImageSpecification.from_os_image().release in ("bionic", "focal"):
home_perms = "755"
else:
home_perms = "750"
if user == "root":
home_dir = "/root"
home_perms = "700"
assert "{} {}".format(user, home_perms) == client.execute(
'stat -c "%U %a" {}'.format(home_dir)
)
if client.execute("test -d {}/.ssh".format(home_dir)).ok:
assert "{} 700".format(user) == client.execute(
'stat -c "%U %a" {}/.ssh'.format(home_dir)
)
assert "{} 600".format(user) == client.execute(
'stat -c "%U %a" {}'.format(filename)
)
# Also ensure ssh-keygen works as expected
client.execute("mkdir {}/.ssh".format(home_dir))
assert client.execute(
"ssh-keygen -b 2048 -t rsa -f {}/.ssh/id_rsa -q -N ''".format(
home_dir
)
).ok
assert client.execute("test -f {}/.ssh/id_rsa".format(home_dir))
assert client.execute("test -f {}/.ssh/id_rsa.pub".format(home_dir))
assert "root 755" == client.execute('stat -c "%U %a" /home')
DEFAULT_KEYS_USERDATA = _USERDATA.format(bootcmd='""')
@pytest.mark.ubuntu
@pytest.mark.user_data(DEFAULT_KEYS_USERDATA)
def test_authorized_keys_default(client: IntegrationInstance):
expected_keys = [
(
"test_user1",
"/home/test_user1/.ssh/authorized_keys",
TEST_USER1_KEYS,
),
(
"test_user2",
"/home/test_user2/.ssh/authorized_keys",
TEST_USER2_KEYS,
),
("ubuntu", "/home/ubuntu/.ssh/authorized_keys", TEST_DEFAULT_KEYS),
("root", "/root/.ssh/authorized_keys", TEST_DEFAULT_KEYS),
]
common_verify(client, expected_keys)
AUTHORIZED_KEYS2_USERDATA = _USERDATA.format(
bootcmd=(
"sed -i 's;#AuthorizedKeysFile.*;AuthorizedKeysFile "
"/etc/ssh/authorized_keys %h/.ssh/authorized_keys2;' "
"/etc/ssh/sshd_config"
)
)
@pytest.mark.ubuntu
@pytest.mark.user_data(AUTHORIZED_KEYS2_USERDATA)
def test_authorized_keys2(client: IntegrationInstance):
expected_keys = [
(
"test_user1",
"/home/test_user1/.ssh/authorized_keys2",
TEST_USER1_KEYS,
),
(
"test_user2",
"/home/test_user2/.ssh/authorized_keys2",
TEST_USER2_KEYS,
),
("ubuntu", "/home/ubuntu/.ssh/authorized_keys2", TEST_DEFAULT_KEYS),
("root", "/root/.ssh/authorized_keys2", TEST_DEFAULT_KEYS),
]
common_verify(client, expected_keys)
NESTED_KEYS_USERDATA = _USERDATA.format(
bootcmd=(
"sed -i 's;#AuthorizedKeysFile.*;AuthorizedKeysFile "
"/etc/ssh/authorized_keys %h/foo/bar/ssh/keys;' "
"/etc/ssh/sshd_config"
)
)
@pytest.mark.ubuntu
@pytest.mark.user_data(NESTED_KEYS_USERDATA)
def test_nested_keys(client: IntegrationInstance):
expected_keys = [
("test_user1", "/home/test_user1/foo/bar/ssh/keys", TEST_USER1_KEYS),
("test_user2", "/home/test_user2/foo/bar/ssh/keys", TEST_USER2_KEYS),
("ubuntu", "/home/ubuntu/foo/bar/ssh/keys", TEST_DEFAULT_KEYS),
("root", "/root/foo/bar/ssh/keys", TEST_DEFAULT_KEYS),
]
common_verify(client, expected_keys)
EXTERNAL_KEYS_USERDATA = _USERDATA.format(
bootcmd=(
"sed -i 's;#AuthorizedKeysFile.*;AuthorizedKeysFile "
"/etc/ssh/authorized_keys /etc/ssh/authorized_keys/%u/keys;' "
"/etc/ssh/sshd_config"
)
)
@pytest.mark.ubuntu
@pytest.mark.user_data(EXTERNAL_KEYS_USERDATA)
def test_external_keys(client: IntegrationInstance):
expected_keys = [
(
"test_user1",
"/etc/ssh/authorized_keys/test_user1/keys",
TEST_USER1_KEYS,
),
(
"test_user2",
"/etc/ssh/authorized_keys/test_user2/keys",
TEST_USER2_KEYS,
),
("ubuntu", "/etc/ssh/authorized_keys/ubuntu/keys", TEST_DEFAULT_KEYS),
("root", "/etc/ssh/authorized_keys/root/keys", TEST_DEFAULT_KEYS),
]
common_verify(client, expected_keys)
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