1 files changed, 123 insertions, 0 deletions
diff --git a/cloud-init.py b/cloud-init.py
new file mode 100644
index 0000000..21d8ff9
--- /dev/null
+++ b/cloud-init.py
@@ -0,0 +1,123 @@
+import os
+import yaml
+
+HOST_ID_CONF = "host_id.conf"
+USER_CA_CONF = "user_id.conf"
+USER_CA_KEYS = "user-ca-keys"
+AUTH_KEYS_CONF = "authorized_keys.conf"
+
+ETC = "/etc/ssh"
+CONFIG = "sshd_config"
+CONFIG_D = "sshd_config.d"
+LOGFILE = "/tmp/vmadm.script"
+USER_DATA = "/var/lib/cloud/instance/user-data.txt"
+
+
+def etc_join(*paths):
+    return os.path.join(etc, *paths)
+
+
+def log(msg):
+    logfile.write(msg)
+    logfile.write("\n")
+    logfile.flush()
+
+
+logfile = open(LOGFILE, "w")
+log("vmadm cloud-init script starting")
+
+if os.environ.get("VMADM_TESTING"):
+    filename = "smoke/user-data"
+    etc = "x"
+else:
+    filename = USER_DATA
+    etc = ETC
+
+key_types = ("rsa", "dsa", "ecdsa", "ed25519")
+
+log(f"loading user-data from {filename}")
+obj = yaml.safe_load(open(filename))
+
+ssh_keys = obj.get("ssh_keys", {})
+user_ca_pubkey = obj.get("user_ca_pubkey", {})
+allow_authorized_keys = obj.get("allow_authorized_keys", True)
+
+keys = []
+certs = []
+
+for key_type in key_types:
+    filename = etc_join(f"ssh_host_{key_type}_key.pub")
+    if os.path.exists(filename):
+        log(f"removing {filename}")
+        os.remove(filename)
+    else:
+        log(f"file {filename} does not exist")
+
+for key_type in key_types:
+    key = ssh_keys.get(f"{key_type}_private")
+    cert = ssh_keys.get(f"{key_type}_certificate")
+    log(f"key {key_type} {key}")
+    log(f"cert {key_type} {cert }")
+
+    if key:
+        filename = etc_join(f"ssh_host_{key_type}_key")
+        log(f"writing key {filename}")
+        keys.append(filename)
+        with open(filename, "w") as f:
+            f.write(key)
+
+    if cert:
+        filename = etc_join(f"ssh_host_{key_type}_key-cert.pub")
+        log(f"writing cert {filename}")
+        certs.append(filename)
+        with open(filename, "w") as f:
+            f.write(cert)
+
+user_ca_filename = etc_join(USER_CA_KEYS)
+if user_ca_pubkey:
+    with open(user_ca_filename, "w") as f:
+        f.write(user_ca_pubkey)
+
+config = etc_join(CONFIG)
+data = ""
+if os.path.exists(config):
+    data = open(config).read()
+
+with open(config, "w") as f:
+    f.write(data)
+
+log(f"configuring sshd {config}")
+log(f"keys {keys}")
+log(f"certs {certs}")
+
+config_d = etc_join(CONFIG_D)
+log(f"config.d {CONFIG_D}")
+if not os.path.exists(config_d):
+    log(f"mkdir {config_d}")
+    os.mkdir(config_d)
+
+host_id_conf = etc_join(CONFIG_D, HOST_ID_CONF)
+log(f"write {host_id_conf}")
+with open(host_id_conf, "w") as f:
+    for filename in keys:
+        log(f"hostkey {filename}")
+        f.write(f"hostkey {filename}\n")
+    for filename in certs:
+        log(f"hostcert {filename}")
+        f.write(f"hostcertificate {filename}\n")
+
+if user_ca_pubkey:
+    user_ca_conf = etc_join(CONFIG_D, USER_CA_CONF)
+    log(f"write {user_ca_conf}")
+    with open(user_ca_conf, "w") as f:
+        log(f"trustedusercakeys {user_ca_filename}")
+        f.write(f"trustedusercakeys {user_ca_filename}\n")
+
+if not allow_authorized_keys:
+    authz_keys_conf = etc_join(CONFIG_D, AUTHZ_KEYS_CONF)
+    log(f"write {authz_keys_conf}")
+    with open(auth_keys_conf, "w") as f:
+        f.write("authorizedkeysfile none\n")
+
+log("vmadm cloud-init script ending")
+logfile.close()