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Fixing accelerated connection plugin

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This commit is contained in:
James Cammarata 2015-10-02 00:35:22 -04:00
parent 00b8a24299
commit 8ef78b1cf8
4 changed files with 229 additions and 186 deletions
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38
lib/ansible/executor/task_executor.py
View file

@ -19,6 +19,7 @@
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import base64
import json
import pipes
import subprocess
@ -33,6 +34,7 @@ from ansible.errors import AnsibleError, AnsibleParserError, AnsibleUndefinedVar
from ansible.playbook.conditional import Conditional
from ansible.playbook.task import Task
from ansible.template import Templar
from ansible.utils.encrypt import key_for_hostname
from ansible.utils.listify import listify_lookup_plugin_terms
from ansible.utils.unicode import to_unicode
from ansible.vars.unsafe_proxy import UnsafeProxy
@ -309,7 +311,7 @@ class TaskExecutor:
return dict(include=include_file, include_variables=include_variables)
# get the connection and the handler for this execution
self._connection = self._get_connection(variables)
self._connection = self._get_connection(variables=variables, templar=templar)
self._connection.set_host_overrides(host=self._host)
self._handler = self._get_action_handler(connection=self._connection, templar=templar)
@ -466,7 +468,7 @@ class TaskExecutor:
else:
return async_result
def _get_connection(self, variables):
def _get_connection(self, variables, templar):
'''
Reads the connection property for the host, and returns the
correct connection object from the list of connection plugins
@ -513,6 +515,38 @@ class TaskExecutor:
if not connection:
raise AnsibleError("the connection plugin '%s' was not found" % conn_type)
if self._play_context.accelerate:
# launch the accelerated daemon here
ssh_connection = connection
handler = self._shared_loader_obj.action_loader.get(
'normal',
task=self._task,
connection=ssh_connection,
play_context=self._play_context,
loader=self._loader,
templar=templar,
shared_loader_obj=self._shared_loader_obj,
)
key = key_for_hostname(self._play_context.remote_addr)
accelerate_args = dict(
password=base64.b64encode(key.__str__()),
port=self._play_context.accelerate_port,
minutes=C.ACCELERATE_DAEMON_TIMEOUT,
ipv6=self._play_context.accelerate_ipv6,
debug=self._play_context.verbosity,
)
connection = self._shared_loader_obj.connection_loader.get('accelerate', self._play_context, self._new_stdin)
if not connection:
raise AnsibleError("the connection plugin '%s' was not found" % conn_type)
try:
connection._connect()
except AnsibleConnectionFailure:
res = handler._execute_module(module_name='accelerate', module_args=accelerate_args, task_vars=variables, delete_remote_tmp=False)
connection._connect()
return connection
def _get_action_handler(self, connection, templar):

10
lib/ansible/playbook/play_context.py
View file

@ -56,6 +56,7 @@ MAGIC_VARIABLE_MAPPING = dict(
remote_addr = ('ansible_ssh_host', 'ansible_host'),
remote_user = ('ansible_ssh_user', 'ansible_user'),
port = ('ansible_ssh_port', 'ansible_port'),
accelerate_port = ('ansible_accelerate_port',),
password = ('ansible_ssh_pass', 'ansible_password'),
private_key_file = ('ansible_ssh_private_key_file', 'ansible_private_key_file'),
pipelining = ('ansible_ssh_pipelining', 'ansible_pipelining'),
@ -142,6 +143,9 @@ class PlayContext(Base):
_ssh_extra_args = FieldAttribute(isa='string')
_connection_lockfd= FieldAttribute(isa='int')
_pipelining = FieldAttribute(isa='bool', default=C.ANSIBLE_SSH_PIPELINING)
_accelerate = FieldAttribute(isa='bool', default=False)
_accelerate_ipv6 = FieldAttribute(isa='bool', default=False, always_post_validate=True)
_accelerate_port = FieldAttribute(isa='int', default=C.ACCELERATE_PORT, always_post_validate=True)
# privilege escalation fields
_become = FieldAttribute(isa='bool')
@ -199,6 +203,12 @@ class PlayContext(Base):
the play class.
'''
# special handling for accelerated mode, as it is set in a separate
# play option from the connection parameter
self.accelerate = play.accelerate
self.accelerate_ipv6 = play.accelerate_ipv6
self.accelerate_port = play.accelerate_port
if play.connection:
self.connection = play.connection

290
lib/ansible/plugins/connection/accelerate.py
View file

@ -18,19 +18,20 @@
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import base64
import json
import os
import base64
import socket
import struct
import time
from ansible.callbacks import vvv, vvvv
from ansible.errors import AnsibleError, AnsibleFileNotFound
from . import ConnectionBase
from .ssh import Connection as SSHConnection
from .paramiko_ssh import Connection as ParamikoConnection
from ansible import utils
from ansible import constants
from ansible import constants as C
from ansible.errors import AnsibleError, AnsibleFileNotFound, AnsibleConnectionFailure
from ansible.parsing.utils.jsonify import jsonify
from ansible.plugins.connection import ConnectionBase
from ansible.plugins.connection.ssh import Connection as SSHConnection
from ansible.plugins.connection.paramiko_ssh import Connection as ParamikoConnection
from ansible.utils.encrypt import key_for_hostname, keyczar_encrypt, keyczar_decrypt
# the chunk size to read and send, assuming mtu 1500 and
# leaving room for base64 (+33%) encoding and header (8 bytes)
@ -42,127 +43,50 @@ CHUNK_SIZE=1044*20
class Connection(ConnectionBase):
''' raw socket accelerated connection '''
def __init__(self, runner, host, port, user, password, private_key_file, *args, **kwargs):
transport = 'accelerate'
has_pipelining = False
become_methods = frozenset(C.BECOME_METHODS).difference(['runas'])
def __init__(self, *args, **kwargs):
super(Connection, self).__init__(*args, **kwargs)
self.runner = runner
self.host = host
self.context = None
self.conn = None
self.user = user
self.key = utils.key_for_hostname(host)
self.port = port[0]
self.accport = port[1]
self.is_connected = False
self.has_pipelining = False
self.become_methods_supported=['sudo']
self.key = key_for_hostname(self._play_context.remote_addr)
if not self.port:
self.port = constants.DEFAULT_REMOTE_PORT
elif not isinstance(self.port, int):
self.port = int(self.port)
if not self.accport:
self.accport = constants.ACCELERATE_PORT
elif not isinstance(self.accport, int):
self.accport = int(self.accport)
if self.runner.original_transport == "paramiko":
self.ssh = ParamikoConnection(
runner=self.runner,
host=self.host,
port=self.port,
user=self.user,
password=password,
private_key_file=private_key_file
)
else:
self.ssh = SSHConnection(
runner=self.runner,
host=self.host,
port=self.port,
user=self.user,
password=password,
private_key_file=private_key_file
)
if not getattr(self.ssh, 'shell', None):
self.ssh.shell = utils.plugins.shell_loader.get('sh')
# attempt to work around shared-memory funness
if getattr(self.runner, 'aes_keys', None):
utils.AES_KEYS = self.runner.aes_keys
@property
def transport(self):
"""String used to identify this Connection class from other classes"""
return 'accelerate'
def _execute_accelerate_module(self):
args = "password=%s port=%s minutes=%d debug=%d ipv6=%s" % (
base64.b64encode(self.key.__str__()),
str(self.accport),
constants.ACCELERATE_DAEMON_TIMEOUT,
int(utils.VERBOSITY),
self.runner.accelerate_ipv6,
)
if constants.ACCELERATE_MULTI_KEY:
args += " multi_key=yes"
inject = dict(password=self.key)
if getattr(self.runner, 'accelerate_inventory_host', False):
inject = utils.combine_vars(inject, self.runner.inventory.get_variables(self.runner.accelerate_inventory_host))
else:
inject = utils.combine_vars(inject, self.runner.inventory.get_variables(self.host))
vvvv("attempting to start up the accelerate daemon...")
self.ssh.connect()
tmp_path = self.runner._make_tmp_path(self.ssh)
return self.runner._execute_module(self.ssh, tmp_path, 'accelerate', args, inject=inject)
def connect(self, allow_ssh=True):
def _connect(self):
''' activates the connection object '''
try:
if not self.is_connected:
wrong_user = False
tries = 3
self.conn = socket.socket()
self.conn.settimeout(constants.ACCELERATE_CONNECT_TIMEOUT)
vvvv("attempting connection to %s via the accelerated port %d" % (self.host,self.accport))
while tries > 0:
try:
self.conn.connect((self.host,self.accport))
break
except socket.error:
vvvv("connection to %s failed, retrying..." % self.host)
time.sleep(0.1)
tries -= 1
if tries == 0:
vvv("Could not connect via the accelerated connection, exceeded # of tries")
raise AnsibleError("FAILED")
elif wrong_user:
vvv("Restarting daemon with a different remote_user")
raise AnsibleError("WRONG_USER")
if not self._connected:
wrong_user = False
tries = 3
self.conn = socket.socket()
self.conn.settimeout(C.ACCELERATE_CONNECT_TIMEOUT)
self._display.vvvv("attempting connection to %s via the accelerated port %d" % (self._play_context.remote_addr,self._play_context.accelerate_port))
while tries > 0:
try:
self.conn.connect((self._play_context.remote_addr,self._play_context.accelerate_port))
break
except socket.error:
self._display.vvvv("connection to %s failed, retrying..." % self._play_context.remote_addr)
time.sleep(0.1)
tries -= 1
if tries == 0:
self._display.vvv("Could not connect via the accelerated connection, exceeded # of tries")
raise AnsibleConnectionFailure("Failed to connect to %s on the accelerated port %s" % (self._play_context.remote_addr, self._play_context.accelerate_port))
elif wrong_user:
self._display.vvv("Restarting daemon with a different remote_user")
raise AnsibleError("The accelerated daemon was started on the remote with a different user")
self.conn.settimeout(constants.ACCELERATE_TIMEOUT)
if not self.validate_user():
# the accelerated daemon was started with a
# different remote_user. The above command
# should have caused the accelerate daemon to
# shutdown, so we'll reconnect.
wrong_user = True
self.conn.settimeout(C.ACCELERATE_TIMEOUT)
if not self.validate_user():
# the accelerated daemon was started with a
# different remote_user. The above command
# should have caused the accelerate daemon to
# shutdown, so we'll reconnect.
wrong_user = True
except AnsibleError as e:
if allow_ssh:
if "WRONG_USER" in e:
vvv("Switching users, waiting for the daemon on %s to shutdown completely..." % self.host)
time.sleep(5)
vvv("Falling back to ssh to startup accelerated mode")
res = self._execute_accelerate_module()
if not res.is_successful():
raise AnsibleError("Failed to launch the accelerated daemon on %s (reason: %s)" % (self.host,res.result.get('msg')))
return self.connect(allow_ssh=False)
else:
raise AnsibleError("Failed to connect to %s:%s" % (self.host,self.accport))
self.is_connected = True
self._connected = True
return self
def send_data(self, data):
@ -173,25 +97,25 @@ class Connection(ConnectionBase):
header_len = 8 # size of a packed unsigned long long
data = b""
try:
vvvv("%s: in recv_data(), waiting for the header" % self.host)
self._display.vvvv("%s: in recv_data(), waiting for the header" % self._play_context.remote_addr)
while len(data) < header_len:
d = self.conn.recv(header_len - len(data))
if not d:
vvvv("%s: received nothing, bailing out" % self.host)
self._display.vvvv("%s: received nothing, bailing out" % self._play_context.remote_addr)
return None
data += d
vvvv("%s: got the header, unpacking" % self.host)
self._display.vvvv("%s: got the header, unpacking" % self._play_context.remote_addr)
data_len = struct.unpack('!Q',data[:header_len])[0]
data = data[header_len:]
vvvv("%s: data received so far (expecting %d): %d" % (self.host,data_len,len(data)))
self._display.vvvv("%s: data received so far (expecting %d): %d" % (self._play_context.remote_addr,data_len,len(data)))
while len(data) < data_len:
d = self.conn.recv(data_len - len(data))
if not d:
vvvv("%s: received nothing, bailing out" % self.host)
self._display.vvvv("%s: received nothing, bailing out" % self._play_context.remote_addr)
return None
vvvv("%s: received %d bytes" % (self.host, len(d)))
self._display.vvvv("%s: received %d bytes" % (self._play_context.remote_addr, len(d)))
data += d
vvvv("%s: received all of the data, returning" % self.host)
self._display.vvvv("%s: received all of the data, returning" % self._play_context.remote_addr)
return data
except socket.timeout:
raise AnsibleError("timed out while waiting to receive data")
@ -203,32 +127,32 @@ class Connection(ConnectionBase):
daemon to exit if they don't match
'''
vvvv("%s: sending request for validate_user" % self.host)
self._display.vvvv("%s: sending request for validate_user" % self._play_context.remote_addr)
data = dict(
mode='validate_user',
username=self.user,
username=self._play_context.remote_user,
)
data = utils.jsonify(data)
data = utils.encrypt(self.key, data)
data = jsonify(data)
data = keyczar_encrypt(self.key, data)
if self.send_data(data):
raise AnsibleError("Failed to send command to %s" % self.host)
raise AnsibleError("Failed to send command to %s" % self._play_context.remote_addr)
vvvv("%s: waiting for validate_user response" % self.host)
self._display.vvvv("%s: waiting for validate_user response" % self._play_context.remote_addr)
while True:
# we loop here while waiting for the response, because a
# long running command may cause us to receive keepalive packets
# ({"pong":"true"}) rather than the response we want.
response = self.recv_data()
if not response:
raise AnsibleError("Failed to get a response from %s" % self.host)
response = utils.decrypt(self.key, response)
response = utils.parse_json(response)
raise AnsibleError("Failed to get a response from %s" % self._play_context.remote_addr)
response = keyczar_decrypt(self.key, response)
response = json.loads(response)
if "pong" in response:
# it's a keepalive, go back to waiting
vvvv("%s: received a keepalive packet" % self.host)
self._display.vvvv("%s: received a keepalive packet" % self._play_context.remote_addr)
continue
else:
vvvv("%s: received the validate_user response: %s" % (self.host, response))
self._display.vvvv("%s: received the validate_user response: %s" % (self._play_context.remote_addr, response))
break
if response.get('failed'):
@ -236,32 +160,30 @@ class Connection(ConnectionBase):
else:
return response.get('rc') == 0
def exec_command(self, cmd, become_user=None, sudoable=False, executable='/bin/sh', in_data=None):
def exec_command(self, cmd, in_data=None, sudoable=True):
''' run a command on the remote host '''
if sudoable and self.runner.become and self.runner.become_method not in self.become_methods_supported:
raise errors.AnsibleError("Internal Error: this module does not support running commands via %s" % self.runner.become_method)
super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
# FIXME:
#if sudoable and self..become and self.runner.become_method not in self.become_methods_supported:
# raise AnsibleError("Internal Error: this module does not support running commands via %s" % self.runner.become_method)
if in_data:
raise AnsibleError("Internal Error: this module does not support optimized module pipelining")
if executable == "":
executable = constants.DEFAULT_EXECUTABLE
if self.runner.become and sudoable:
cmd, prompt, success_key = utils.make_become_cmd(cmd, become_user, executable, self.runner.become_method, '', self.runner.become_exe)
vvv("EXEC COMMAND %s" % cmd)
self._display.vvv("EXEC COMMAND %s" % cmd)
data = dict(
mode='command',
cmd=cmd,
executable=executable,
executable=C.DEFAULT_EXECUTABLE,
)
data = utils.jsonify(data)
data = utils.encrypt(self.key, data)
data = jsonify(data)
data = keyczar_encrypt(self.key, data)
if self.send_data(data):
raise AnsibleError("Failed to send command to %s" % self.host)
raise AnsibleError("Failed to send command to %s" % self._play_context.remote_addr)
while True:
# we loop here while waiting for the response, because a
@ -269,15 +191,15 @@ class Connection(ConnectionBase):
# ({"pong":"true"}) rather than the response we want.
response = self.recv_data()
if not response:
raise AnsibleError("Failed to get a response from %s" % self.host)
response = utils.decrypt(self.key, response)
response = utils.parse_json(response)
raise AnsibleError("Failed to get a response from %s" % self._play_context.remote_addr)
response = keyczar_decrypt(self.key, response)
response = json.loads(response)
if "pong" in response:
# it's a keepalive, go back to waiting
vvvv("%s: received a keepalive packet" % self.host)
self._display.vvvv("%s: received a keepalive packet" % self._play_context.remote_addr)
continue
else:
vvvv("%s: received the response" % self.host)
self._display.vvvv("%s: received the response" % self._play_context.remote_addr)
break
return (response.get('rc', None), response.get('stdout', ''), response.get('stderr', ''))
@ -285,7 +207,7 @@ class Connection(ConnectionBase):
def put_file(self, in_path, out_path):
''' transfer a file from local to remote '''
vvv("PUT %s TO %s" % (in_path, out_path), host=self.host)
self._display.vvv("PUT %s TO %s" % (in_path, out_path), host=self._play_context.remote_addr)
if not os.path.exists(in_path):
raise AnsibleFileNotFound("file or module does not exist: %s" % in_path)
@ -293,51 +215,51 @@ class Connection(ConnectionBase):
fd = file(in_path, 'rb')
fstat = os.stat(in_path)
try:
vvv("PUT file is %d bytes" % fstat.st_size)
self._display.vvv("PUT file is %d bytes" % fstat.st_size)
last = False
while fd.tell() <= fstat.st_size and not last:
vvvv("file position currently %ld, file size is %ld" % (fd.tell(), fstat.st_size))
self._display.vvvv("file position currently %ld, file size is %ld" % (fd.tell(), fstat.st_size))
data = fd.read(CHUNK_SIZE)
if fd.tell() >= fstat.st_size:
last = True
data = dict(mode='put', data=base64.b64encode(data), out_path=out_path, last=last)
if self.runner.become:
data['user'] = self.runner.become_user
data = utils.jsonify(data)
data = utils.encrypt(self.key, data)
if self._play_context.become:
data['user'] = self._play_context.become_user
data = jsonify(data)
data = keyczar_encrypt(self.key, data)
if self.send_data(data):
raise AnsibleError("failed to send the file to %s" % self.host)
raise AnsibleError("failed to send the file to %s" % self._play_context.remote_addr)
response = self.recv_data()
if not response:
raise AnsibleError("Failed to get a response from %s" % self.host)
response = utils.decrypt(self.key, response)
response = utils.parse_json(response)
raise AnsibleError("Failed to get a response from %s" % self._play_context.remote_addr)
response = keyczar_decrypt(self.key, response)
response = json.loads(response)
if response.get('failed',False):
raise AnsibleError("failed to put the file in the requested location")
finally:
fd.close()
vvvv("waiting for final response after PUT")
self._display.vvvv("waiting for final response after PUT")
response = self.recv_data()
if not response:
raise AnsibleError("Failed to get a response from %s" % self.host)
response = utils.decrypt(self.key, response)
response = utils.parse_json(response)
raise AnsibleError("Failed to get a response from %s" % self._play_context.remote_addr)
response = keyczar_decrypt(self.key, response)
response = json.loads(response)
if response.get('failed',False):
raise AnsibleError("failed to put the file in the requested location")
def fetch_file(self, in_path, out_path):
''' save a remote file to the specified path '''
vvv("FETCH %s TO %s" % (in_path, out_path), host=self.host)
self._display.vvv("FETCH %s TO %s" % (in_path, out_path), host=self._play_context.remote_addr)
data = dict(mode='fetch', in_path=in_path)
data = utils.jsonify(data)
data = utils.encrypt(self.key, data)
data = jsonify(data)
data = keyczar_encrypt(self.key, data)
if self.send_data(data):
raise AnsibleError("failed to initiate the file fetch with %s" % self.host)
raise AnsibleError("failed to initiate the file fetch with %s" % self._play_context.remote_addr)
fh = open(out_path, "w")
try:
@ -345,9 +267,9 @@ class Connection(ConnectionBase):
while True:
response = self.recv_data()
if not response:
raise AnsibleError("Failed to get a response from %s" % self.host)
response = utils.decrypt(self.key, response)
response = utils.parse_json(response)
raise AnsibleError("Failed to get a response from %s" % self._play_context.remote_addr)
response = keyczar_decrypt(self.key, response)
response = json.loads(response)
if response.get('failed', False):
raise AnsibleError("Error during file fetch, aborting")
out = base64.b64decode(response['data'])
@ -355,8 +277,8 @@ class Connection(ConnectionBase):
bytes += len(out)
# send an empty response back to signify we
# received the last chunk without errors
data = utils.jsonify(dict())
data = utils.encrypt(self.key, data)
data = jsonify(dict())
data = keyczar_encrypt(self.key, data)
if self.send_data(data):
raise AnsibleError("failed to send ack during file fetch")
if response.get('last', False):
@ -367,7 +289,7 @@ class Connection(ConnectionBase):
# point in the future or we may just have the put/fetch
# operations not send back a final response at all
response = self.recv_data()
vvv("FETCH wrote %d bytes to %s" % (bytes, out_path))
self._display.vvv("FETCH wrote %d bytes to %s" % (bytes, out_path))
fh.close()
def close(self):

77
lib/ansible/utils/encrypt.py
View file

@ -18,6 +18,11 @@ from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import os
import stat
import time
import warnings
PASSLIB_AVAILABLE = False
try:
import passlib.hash
@ -25,6 +30,34 @@ try:
except:
pass
KEYCZAR_AVAILABLE=False
try:
try:
# some versions of pycrypto may not have this?
from Crypto.pct_warnings import PowmInsecureWarning
except ImportError:
PowmInsecureWarning = RuntimeWarning
with warnings.catch_warnings(record=True) as warning_handler:
warnings.simplefilter("error", PowmInsecureWarning)
try:
import keyczar.errors as key_errors
from keyczar.keys import AesKey
except PowmInsecureWarning:
system_warning(
"The version of gmp you have installed has a known issue regarding " + \
"timing vulnerabilities when used with pycrypto. " + \
"If possible, you should update it (i.e. yum update gmp)."
)
warnings.resetwarnings()
warnings.simplefilter("ignore")
import keyczar.errors as key_errors
from keyczar.keys import AesKey
KEYCZAR_AVAILABLE=True
except ImportError:
pass
from ansible import constants as C
from ansible.errors import AnsibleError
__all__ = ['do_encrypt']
@ -47,3 +80,47 @@ def do_encrypt(result, encrypt, salt_size=None, salt=None):
return result
def key_for_hostname(hostname):
# fireball mode is an implementation of ansible firing up zeromq via SSH
# to use no persistent daemons or key management
if not KEYCZAR_AVAILABLE:
raise AnsibleError("python-keyczar must be installed on the control machine to use accelerated modes")
key_path = os.path.expanduser(C.ACCELERATE_KEYS_DIR)
if not os.path.exists(key_path):
os.makedirs(key_path, mode=0700)
os.chmod(key_path, int(C.ACCELERATE_KEYS_DIR_PERMS, 8))
elif not os.path.isdir(key_path):
raise AnsibleError('ACCELERATE_KEYS_DIR is not a directory.')
if stat.S_IMODE(os.stat(key_path).st_mode) != int(C.ACCELERATE_KEYS_DIR_PERMS, 8):
raise AnsibleError('Incorrect permissions on the private key directory. Use `chmod 0%o %s` to correct this issue, and make sure any of the keys files contained within that directory are set to 0%o' % (int(C.ACCELERATE_KEYS_DIR_PERMS, 8), C.ACCELERATE_KEYS_DIR, int(C.ACCELERATE_KEYS_FILE_PERMS, 8)))
key_path = os.path.join(key_path, hostname)
# use new AES keys every 2 hours, which means fireball must not allow running for longer either
if not os.path.exists(key_path) or (time.time() - os.path.getmtime(key_path) > 60*60*2):
key = AesKey.Generate(size=256)
fd = os.open(key_path, os.O_WRONLY | os.O_CREAT, int(C.ACCELERATE_KEYS_FILE_PERMS, 8))
fh = os.fdopen(fd, 'w')
fh.write(str(key))
fh.close()
return key
else:
if stat.S_IMODE(os.stat(key_path).st_mode) != int(C.ACCELERATE_KEYS_FILE_PERMS, 8):
raise AnsibleError('Incorrect permissions on the key file for this host. Use `chmod 0%o %s` to correct this issue.' % (int(C.ACCELERATE_KEYS_FILE_PERMS, 8), key_path))
fh = open(key_path)
key = AesKey.Read(fh.read())
fh.close()
return key
def keyczar_encrypt(key, msg):
return key.Encrypt(msg.encode('utf-8'))
def keyczar_decrypt(key, msg):
try:
return key.Decrypt(msg)
except key_errors.InvalidSignatureError:
raise AnsibleError("decryption failed")