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#
# Common code for the EC2 configuration files in Ubuntu
# Copyright (C) 2008-2010 Canonical Ltd.
#
# Author: Chuck Short <chuck.short@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import yaml
import re
import ec2init
import ec2init.util as util
import subprocess
import os
import glob
import sys
per_instance="once-per-instance"
class CloudConfig():
cfgfile = None
handlers = { }
cfg = None
def __init__(self,cfgfile):
self.cloud = ec2init.EC2Init()
self.cfg = self.get_config_obj(cfgfile)
self.cloud.get_data_source()
self.add_handler('apt-update-upgrade', self.h_apt_update_upgrade)
self.add_handler('config-ssh')
self.add_handler('disable-ec2-metadata')
def get_config_obj(self,cfgfile):
f=file(cfgfile)
cfg=yaml.load(f.read())
f.close()
if cfg is None: cfg = { }
return(util.mergedict(cfg,self.cloud.cfg))
def convert_old_config(self):
# support reading the old ConfigObj format file and turning it
# into a yaml string
try:
f = file(self.conffile)
str=file.read().replace('=',': ')
f.close()
return str
except:
return("")
def add_handler(self, name, handler=None, freq=None):
if handler is None:
try:
handler=getattr(self,'h_%s' % name.replace('-','_'))
except:
raise Exception("Unknown hander for name %s" %name)
if freq is None:
freq = per_instance
self.handlers[name]= { 'handler': handler, 'freq': freq }
def get_handler_info(self, name):
return(self.handlers[name]['handler'], self.handlers[name]['freq'])
def parse_ssh_keys(self):
disableRoot = self.cfg['disable_root']
if disableRoot == 'true':
value = 'disabled_root'
return value
else:
ec2Key = self.cfg['ec2_fetch_key']
if ec2Key != 'none':
value = 'default_key'
return value
else:
return ec2Key
def add_ppa(self):
#value = self.cfg['apt_sources']
for ent in self.cfg['apt_sources']:
ppa = ent['source']
where = ppa.find('ppa:')
if where != -1:
return ppa
def add_custom_repo(self):
sources = []
value = self.cfg['apt_sources']
for ent in self.cfg['apt_sources']:
if ent.has_key('keyserver'):
keyserver = ent['keyserver']
if ent.has_key('keyid'):
keyid = ent['keyid']
if ent.has_key('filename'):
filename = ent['filename']
source = ent['source']
if source.startswith("deb"):
sources.append(source)
return (keyserver,sources,keyid,filename)
def handle(self, name, args):
handler = None
freq = None
try:
(handler, freq) = self.get_handler_info(name)
except:
raise Exception("Unknown config key %s\n" % name)
self.cloud.sem_and_run(name, freq, handler, [ name, args ])
def h_apt_update_upgrade(self,name,args):
update = util.get_cfg_option_bool(self.cfg, 'apt_update', False)
upgrade = util.get_cfg_option_bool(self.cfg, 'apt_upgrade', False)
pkglist = []
if 'packages' in self.cfg:
if isinstance(self.cfg['packages'],list):
pkglist = self.cfg['packages']
else: pkglist.append(self.cfg['packages'])
if update or upgrade or pkglist:
#retcode = subprocess.call(list)
subprocess.Popen(['apt-get', 'update']).communicate()
e=os.environ.copy()
e['DEBIAN_FRONTEND']='noninteractive'
if upgrade:
subprocess.Popen(['apt-get', 'upgrade', '--assume-yes'], env=e).communicate()
if pkglist:
cmd=['apt-get', 'install', '--assume-yes']
cmd.extend(pkglist)
subprocess.Popen(cmd, env=e).communicate()
return(True)
def h_disable_ec2_metadata(self,name,args):
if util.get_cfg_option_bool(self.cfg, "disable_ec2_metadata", False):
#fwall="iptables -A OUTPUT -p tcp --dport 80 --destination 169.254.169.254 -j REJECT"
fwall="route add -host 169.254.169.254 reject"
subprocess.call(fwall.split(' '))
def h_config_ssh(self,name,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 self.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 self.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)))
# it is possible that an ssh job started either
# before the files above were unlinked, or while only one of
# our generated keys were written. In either case, stop that job
# if anything started from here out it would be ok.
subprocess.call(('stop', 'ssh'))
try:
user = util.get_cfg_option_str(self.cfg,'user')
disable_root = util.get_cfg_option_bool(self.cfg, "disable_root", True)
keys = self.cloud.get_public_ssh_keys()
apply_credentials(keys,user,disable_root)
except:
warn("applying credentials failed!\n")
send_ssh_keys_to_console()
subprocess.call(('start', 'ssh'))
def h_ec2_ebs_mounts(self,name,args):
print "Warning, not doing anything for config %s" % name
def h_config_setup_raid(self,name,args):
print "Warning, not doing anything for config %s" % name
def h_config_runurl(self,name,args):
print "Warning, not doing anything for config %s" % name
def apply_credentials(keys, user, disable_root):
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)
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 warn(str):
sys.stderr.write("Warning:%s\n" % str)
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