ssh-util: allow cloudinit to merge all ssh keys into a custom user file, defined in AuthorizedKeysFile

cloudinit/ssh_util.py

@@ -252,13 +252,15 @@ def render_authorizedkeysfile_paths(value, homedir, username):
 def extract_authorized_keys(username, sshd_cfg_file=DEF_SSHD_CFG):
     (ssh_dir, pw_ent) = users_ssh_info(username)
     default_authorizedkeys_file = os.path.join(ssh_dir, 'authorized_keys')
+    user_authorizedkeys_file = default_authorizedkeys_file
     auth_key_fns = []
     with util.SeLinuxGuard(ssh_dir, recursive=True):
         try:
             ssh_cfg = parse_ssh_config_map(sshd_cfg_file)
+            key_paths = ssh_cfg.get("authorizedkeysfile",
+                                    "%h/.ssh/authorized_keys")
             auth_key_fns = render_authorizedkeysfile_paths(
-                ssh_cfg.get("authorizedkeysfile", "%h/.ssh/authorized_keys"),
-                pw_ent.pw_dir, username)
+                key_paths, pw_ent.pw_dir, username)
 
         except (IOError, OSError):
             # Give up and use a default key filename
@@ -267,8 +269,22 @@ def extract_authorized_keys(username, sshd_cfg_file=DEF_SSHD_CFG):
                         "config from %r, using 'AuthorizedKeysFile' file "
                         "%r instead", DEF_SSHD_CFG, auth_key_fns[0])
 
+    # check if one of the keys is the user's one
+    for key_path, auth_key_fn in zip(key_paths.split(), auth_key_fns):
+        if any([
+            '%u' in key_path,
+            '%h' in key_path,
+            auth_key_fn.startswith('{}/'.format(pw_ent.pw_dir))
+        ]):
+            user_authorizedkeys_file = auth_key_fn
+
+    if user_authorizedkeys_file != default_authorizedkeys_file:
+        LOG.debug(
+            "AuthorizedKeysFile has an user-specific authorized_keys, "
+            "using %s", user_authorizedkeys_file)
+
     # always store all the keys in the user's private file
-    return (default_authorizedkeys_file, parse_authorized_keys(auth_key_fns))
+    return (user_authorizedkeys_file, parse_authorized_keys(auth_key_fns))
 
 
 def setup_user_keys(keys, username, options=None):

tests/integration_tests/assets/keys/id_rsa.test1

@@ -0,0 +1,38 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
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+CHbTWbsFrHR1qFAAAACmphbWVzQG5ld3Q=
+-----END OPENSSH PRIVATE KEY-----

tests/integration_tests/assets/keys/id_rsa.test1.pub

@@ -0,0 +1 @@
+ssh-rsa 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 test1@host

tests/integration_tests/assets/keys/id_rsa.test2

@@ -0,0 +1,38 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
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+-----END OPENSSH PRIVATE KEY-----

tests/integration_tests/assets/keys/id_rsa.test2.pub

@@ -0,0 +1 @@
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC8rnQPY9Y5ziKTIdVElLq0OGrOMvlwqKK8gPinVfwFgJXDzdcAQY4uci1TJVcc0AOWHp+lWrU1joDYlW3KCg8XpkXHymHshYyaeEN2fEsvIaxuF3UzW2JckP9H7dacYdEng8qtBq8wuCodGuJ5XdBVV+MVJ6jqNf/hOu4/pma8hMxlYmtdoamHEn+k/KQR2Q6LwCYpT0U2+KiPI9Lac22P0H/rfkh2Ba+t3tV/lhyzD0xHnktZKJ3BrznpEfrZiXoukQZMebWUmIyTW7zwk9Kq+iGFpSQsqQWlxDBwHSbvpbUo7KWUmyZfxs1euVmwj5aKJgjteXm9CbbXsMS415q+08C0MzG7weZODZQnnk1rF6Ft97aXHaTmRgYbDeLU7U5U3alnb84HvUu5xh3/mrE9rPTfCzBwY4lgY+Q1zjS90RL9Jxzti3weydm7OqTI6DOfQeJQLOhhRgthOkt/7IabDFLIARjTnpo5+QKxugoc4qI6aUnE1plkVCRfV696ngM= test2@host

tests/integration_tests/assets/keys/id_rsa.test3

@@ -0,0 +1,38 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
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+-----END OPENSSH PRIVATE KEY-----

tests/integration_tests/assets/keys/id_rsa.test3.pub

@@ -0,0 +1 @@
+ssh-rsa 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 test3@host

tests/integration_tests/modules/test_ssh_keysfile.py

@@ -0,0 +1,85 @@
+import paramiko
+import pytest
+from io import StringIO
+from paramiko.ssh_exception import SSHException
+
+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:
+ - sed -i 's;#AuthorizedKeysFile.*;AuthorizedKeysFile /etc/ssh/authorized_keys %h/.ssh/authorized_keys2;' /etc/ssh/sshd_config
+ssh_authorized_keys:
+ - {default}
+users:
+- default
+- name: test_user1
+  ssh_authorized_keys:
+    - {user1}
+- name: test_user2
+  ssh_authorized_keys:
+    - {user2}
+""".format(  # noqa: E501
+    default=TEST_DEFAULT_KEYS.public_key,
+    user1=TEST_USER1_KEYS.public_key,
+    user2=TEST_USER2_KEYS.public_key,
+)
+
+
+@pytest.mark.ubuntu
+@pytest.mark.user_data(USERDATA)
+def test_authorized_keys(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),
+    ]
+
+    for user, filename, keys in expected_keys:
+        contents = client.read_from_file(filename)
+        if user in ['ubuntu', 'root']:
+            # Our personal public key gets added by pycloudlib
+            lines = contents.split('\n')
+            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,
+                )

tests/integration_tests/util.py

@@ -3,12 +3,15 @@
 import os
 import time
 from contextlib import contextmanager
+from collections import namedtuple
 from pathlib import Path
 
-log = logging.getLogger('integration_testing')
 
+log = logging.getLogger('integration_testing')
+key_pair = namedtuple('key_pair', 'public_key private_key')
 
 ASSETS_DIR = Path('tests/integration_tests/assets')
+KEY_PATH = ASSETS_DIR / 'keys'
 
 
 def verify_ordered_items_in_text(to_verify: list, text: str):
@@ -51,3 +54,13 @@ def emit_dots():
         yield
     finally:
         dot_process.terminate()
+
+
+def get_test_rsa_keypair(key_name: str = 'test1') -> key_pair:
+    private_key_path = KEY_PATH / 'id_rsa.{}'.format(key_name)
+    public_key_path = KEY_PATH / 'id_rsa.{}.pub'.format(key_name)
+    with public_key_path.open() as public_file:
+        public_key = public_file.read()
+    with private_key_path.open() as private_file:
+        private_key = private_file.read()
+    return key_pair(public_key, private_key)