make cloud-config modules configurable by cloud-config

The list of cloud-config modules is now kept in cloud config itself.
There is a builtin list in cloudinit, which is overrideable by 
 /etc/cloud/cloud.cfg or user data cloud-config.

This should make the modules more easily added or removed (as no code
needs to be edited now)

Basic summary of changes:
 - move CloudConfig.py -> cloudinit/CloudConfig/__init__.py
 - split cloud-config modules into their own files named
   cloudinit/CloudConfig/cc_<name>.py
 - remove all the upstart/cloud-config-* scripts, replacing them with
   upstart/cloud-config.conf

1 files changed, 91 insertions, 0 deletions

diff --git a/cloudinit/CloudConfig/cc_ssh.py b/cloudinit/CloudConfig/cc_ssh.py
new file mode 100644
index 00000000..08d1e243
--- /dev/null
+++ b/cloudinit/CloudConfig/cc_ssh.py
@@ -0,0 +1,91 @@
+import cloudinit.util as util
+import os
+import glob
+import subprocess
+
+def handle(name,cfg,cloud,log,args):
+    # remove the static keys from the pristine image
+    for f in glob.glob("/etc/ssh/ssh_host_*_key*"):
+        try: os.unlink(f)
+        except: pass
+
+    if cfg.has_key("ssh_keys"):
+        # if there are keys in cloud-config, use them
+        key2file = {
+            "rsa_private" : ("/etc/ssh/ssh_host_rsa_key", 0600),
+            "rsa_public"  : ("/etc/ssh/ssh_host_rsa_key.pub", 0644),
+            "dsa_private" : ("/etc/ssh/ssh_host_dsa_key", 0600),
+            "dsa_public"  : ("/etc/ssh/ssh_host_dsa_key.pub", 0644)
+        }
+
+        for key,val in cfg["ssh_keys"].items():
+            if key2file.has_key(key):
+                util.write_file(key2file[key][0],val,key2file[key][1])
+    else:
+        # if not, generate them
+        genkeys ='ssh-keygen -f /etc/ssh/ssh_host_rsa_key -t rsa -N ""; '
+        genkeys+='ssh-keygen -f /etc/ssh/ssh_host_dsa_key -t dsa -N ""; '
+        subprocess.call(('sh', '-c', "{ %s } </dev/null" % (genkeys)))
+
+    try:
+        user = util.get_cfg_option_str(cfg,'user')
+        disable_root = util.get_cfg_option_bool(cfg, "disable_root", True)
+        keys = cloud.get_public_ssh_keys()
+
+        if cfg.has_key("ssh_authorized_keys"):
+            cfgkeys = cfg["ssh_authorized_keys"]
+            keys.extend(cfgkeys)
+
+        apply_credentials(keys,user,disable_root)
+    except:
+        log.warn("applying credentials failed!\n")
+
+    send_ssh_keys_to_console()
+
+def send_ssh_keys_to_console():
+    send_keys_sh = """
+    {
+    echo
+    echo "#############################################################"
+    echo "-----BEGIN SSH HOST KEY FINGERPRINTS-----"
+    ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key.pub
+    ssh-keygen -l -f /etc/ssh/ssh_host_dsa_key.pub
+    echo "-----END SSH HOST KEY FINGERPRINTS-----"
+    echo "#############################################################"
+    } | logger -p user.info -s -t "ec2"
+    """
+    subprocess.call(('sh', '-c', send_keys_sh))
+
+def apply_credentials(keys, user, disable_root):
+    keys = set(keys)
+    if user:
+        setup_user_keys(keys, user, '')
+ 
+    if disable_root:
+        key_prefix = 'command="echo \'Please login as the %s user rather than root user.\';echo;sleep 10" ' % user
+    else:
+        key_prefix = ''
+
+    setup_user_keys(keys, 'root', key_prefix)
+
+def setup_user_keys(keys, user, key_prefix):
+    import pwd
+    saved_umask = os.umask(077)
+
+    pwent = pwd.getpwnam(user)
+
+    ssh_dir = '%s/.ssh' % pwent.pw_dir
+    if not os.path.exists(ssh_dir):
+        os.mkdir(ssh_dir)
+        os.chown(ssh_dir, pwent.pw_uid, pwent.pw_gid)
+
+    authorized_keys = '%s/.ssh/authorized_keys' % pwent.pw_dir
+    fp = open(authorized_keys, 'a')
+    fp.write(''.join(['%s%s\n' % (key_prefix, key) for key in keys]))
+    fp.close()
+
+    os.chown(authorized_keys, pwent.pw_uid, pwent.pw_gid)
+
+    os.umask(saved_umask)
+
+