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70d8a1059c
In Python3 systems, there would be confusion about bytes versus str. Fix this so that ssh can work more consistently.
259 lines
10 KiB
Python
259 lines
10 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2015-2018 Lenovo
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This plugin provides an ssh implementation comforming to the 'console'
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# specification. consoleserver or shellserver would be equally likely
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# to use this.
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import confluent.exceptions as cexc
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import confluent.interface.console as conapi
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import confluent.log as log
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try:
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import cryptography
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except ImportError:
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# Using older, non-crypography based paramiko
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cryptography = None
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import eventlet
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import hashlib
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import sys
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sys.modules['gssapi'] = None
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paramiko = eventlet.import_patched('paramiko')
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warnhostkey = False
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if cryptography and cryptography.__version__.split('.') < ['1', '5']:
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# older cryptography with paramiko breaks most key support except
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# ed25519
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warnhostkey = True
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paramiko.transport.Transport._preferred_keys = filter(
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lambda x: 'ed25519' in x,
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paramiko.transport.Transport._preferred_keys)
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class HostKeyHandler(paramiko.client.MissingHostKeyPolicy):
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def __init__(self, configmanager, node):
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self.cfm = configmanager
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self.node = node
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def missing_host_key(self, client, hostname, key):
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fingerprint = 'sha512$' + hashlib.sha512(key.asbytes()).hexdigest()
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cfg = self.cfm.get_node_attributes(
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self.node, ('pubkeys.ssh', 'pubkeys.addpolicy'))
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if 'pubkeys.ssh' not in cfg[self.node]:
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if ('pubkeys.addpolicy' in cfg[self.node] and
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cfg[self.node]['pubkeys.addpolicy'] and
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cfg[self.node]['pubkeys.addpolicy']['value'] == 'manual'):
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raise cexc.PubkeyInvalid('New ssh key detected',
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key.asbytes(), fingerprint,
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'pubkeys.ssh', 'newkey')
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auditlog = log.Logger('audit')
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auditlog.log({'node': self.node, 'event': 'sshautoadd',
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'fingerprint': fingerprint})
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self.cfm.set_node_attributes(
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{self.node: {'pubkeys.ssh': fingerprint}})
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return True
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elif cfg[self.node]['pubkeys.ssh']['value'] == fingerprint:
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return True
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raise cexc.PubkeyInvalid(
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'Mismatched SSH host key detected', key.asbytes(), fingerprint,
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'pubkeys.ssh', 'mismatch'
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)
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class SshShell(conapi.Console):
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def __init__(self, node, config, username=b'', password=b''):
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self.node = node
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self.ssh = None
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self.datacallback = None
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self.nodeconfig = config
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self.username = username
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self.password = password
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self.connected = False
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self.width = 80
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self.height = 24
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self.inputmode = 0 # 0 = username, 1 = password...
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def resize(self, width, height):
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self.width = width
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self.height = height
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if not self.connected:
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return
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self.shell.resize_pty(width=width, height=height)
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def recvdata(self):
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while self.connected:
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pendingdata = self.shell.recv(8192)
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if not pendingdata:
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self.ssh.close()
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if self.datacallback:
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self.datacallback(conapi.ConsoleEvent.Disconnect)
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return
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self.datacallback(pendingdata)
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def connect(self, callback):
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# for now, we just use the nodename as the presumptive ssh destination
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# TODO(jjohnson2): use a 'nodeipget' utility function for architectures
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# that would rather not use the nodename as anything but an opaque
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# identifier
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self.datacallback = callback
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if self.username is not b'':
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self.logon()
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else:
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self.inputmode = 0
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callback('\r\nlogin as: ')
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return
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def logon(self):
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self.ssh = paramiko.SSHClient()
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self.ssh.set_missing_host_key_policy(
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HostKeyHandler(self.nodeconfig, self.node))
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try:
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self.datacallback('\r\nConnecting to {}...'.format(self.node))
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self.ssh.connect(self.node, username=self.username,
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password=self.password, allow_agent=False,
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look_for_keys=False)
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except paramiko.AuthenticationException as e:
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self.ssh.close()
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self.inputmode = 0
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self.username = b''
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self.password = b''
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self.datacallback('\r\nError connecting to {0}:\r\n {1}\r\n'.format(self.node, str(e)))
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self.datacallback('\r\nlogin as: ')
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return
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except paramiko.ssh_exception.NoValidConnectionsError as e:
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self.ssh.close()
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self.datacallback('\r\nError connecting to {0}:\r\n {1}\r\n'.format(self.node, str(e)))
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self.inputmode = 0
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self.username = b''
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self.password = b''
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self.datacallback('\r\nlogin as: ')
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return
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except cexc.PubkeyInvalid as pi:
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self.ssh.close()
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self.keyaction = b''
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self.candidatefprint = pi.fingerprint
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self.datacallback(pi.message)
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self.keyattrname = pi.attrname
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self.datacallback('\r\nNew fingerprint: ' + pi.fingerprint)
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self.inputmode = -1
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self.datacallback('\r\nEnter "disconnect" or "accept": ')
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return
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except paramiko.SSHException as pi:
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self.ssh.close()
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self.inputmode = -2
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warn = str(pi)
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if warnhostkey:
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warn += ' (Older cryptography package on this host only ' \
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'works with ed25519, check ssh startup on target ' \
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'and permissions on /etc/ssh/*key)\r\n' \
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'Press Enter to close...'
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self.datacallback('\r\n' + warn)
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return
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except Exception as e:
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self.ssh.close()
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self.ssh.close()
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self.inputmode = 0
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self.username = b''
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self.password = b''
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warn = 'Error connecting to {0}:\r\n {1}\r\n'.format(self.node, str(e))
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self.datacallback('\r\n' + warn)
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self.datacallback('\r\nlogin as: ')
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return
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self.inputmode = 2
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self.connected = True
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self.datacallback('Connected\r\n')
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self.shell = self.ssh.invoke_shell(width=self.width,
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height=self.height)
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self.rxthread = eventlet.spawn(self.recvdata)
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def write(self, data):
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if self.inputmode == -2:
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self.datacallback(conapi.ConsoleEvent.Disconnect)
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return
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elif self.inputmode == -1:
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while len(data) and data[0:1] == b'\x7f' and len(self.keyaction):
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self.datacallback('\b \b') # erase previously echoed value
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self.keyaction = self.keyaction[:-1]
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data = data[1:]
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while len(data) and data[0:1] == b'\x7f':
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data = data[1:]
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while b'\x7f' in data:
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delidx = data.index(b'\x7f')
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data = data[:delidx - 1] + data[delidx + 1:]
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self.keyaction += data
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if b'\r' in self.keyaction:
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action = self.keyaction.split(b'\r')[0]
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if action.lower() == b'accept':
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self.nodeconfig.set_node_attributes(
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{self.node:
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{self.keyattrname: self.candidatefprint}})
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self.datacallback('\r\n')
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self.logon()
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elif action.lower() == b'disconnect':
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self.datacallback(conapi.ConsoleEvent.Disconnect)
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else:
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self.keyaction = b''
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self.datacallback('\r\nEnter "disconnect" or "accept": ')
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elif len(data) > 0:
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self.datacallback(data)
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elif self.inputmode == 0:
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while len(data) and data[0:1] == b'\x7f' and len(self.username):
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self.datacallback('\b \b') # erase previously echoed value
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self.username = self.username[:-1]
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data = data[1:]
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while len(data) and data[0:1] == b'\x7f':
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data = data[1:]
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while b'\x7f' in data:
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delidx = data.index(b'\x7f')
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data = data[:delidx - 1] + data[delidx + 1:]
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self.username += data
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if b'\r' in self.username:
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self.username, self.password = self.username.split(b'\r')[:2]
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lastdata = data.split(b'\r')[0]
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if lastdata != '':
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self.datacallback(lastdata)
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self.datacallback('\r\nEnter password: ')
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self.inputmode = 1
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elif len(data) > 0:
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# echo back typed data
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self.datacallback(data)
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elif self.inputmode == 1:
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while len(data) > 0 and data[0:1] == b'\x7f':
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self.password = self.password[:-1]
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data = data[1:]
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while b'\x7f' in data:
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delidx = data.index(b'\x7f')
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data = data[:delidx - 1] + data[delidx + 1:]
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self.password += data
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if b'\r' in self.password:
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self.password = self.password.split(b'\r')[0]
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self.datacallback(b'\r\n')
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self.logon()
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else:
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self.shell.sendall(data)
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def close(self):
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if self.ssh is not None:
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self.ssh.close()
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self.datacallback = None
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def create(nodes, element, configmanager, inputdata):
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if len(nodes) == 1:
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return SshShell(nodes[0], configmanager)
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