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Implement SSH host key management

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Like self-signed TLS certificates, SSH host keys
warrant a similar security policy.  This implementations
follows the lead of the TLS management and uses the same
policy name and interpretation, just storing the value
in 'pubkeys.ssh' for the node rather than an extensible
set of entry points (for now).
This commit is contained in:
Jarrod Johnson 2016-02-11 09:13:21 -05:00
parent a2445e7f65
commit a574c69535
2 changed files with 38 additions and 3 deletions
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4
confluent_server/confluent/config/attributes.py
View File

@ -278,4 +278,8 @@ node = {
'description': ('Fingerprint of the TLS certificate recognized as'
'belonging to the hardware manager of the server'),
},
'pubkeys.ssh': {
'description': ('Fingerprint of the SSH key of the OS running on the '
'system.'),
},
}

37
confluent_server/confluent/plugins/shell/ssh.py
View File

@ -14,17 +14,48 @@
# See the License for the specific language governing permissions and
# limitations under the License.
__author__ = 'jjohnson2'
# This plugin provides an ssh implementation comforming to the 'console'
# specification. consoleserver or shellserver would be equally likely
# to use this.
import confluent.exceptions as cexc
import confluent.interface.console as conapi
import confluent.log as log
import eventlet
import hashlib
paramiko = eventlet.import_patched('paramiko')
class HostKeyHandler(paramiko.client.MissingHostKeyPolicy):
def __init__(self, configmanager, node):
self.cfm = configmanager
self.node = node
def missing_host_key(self, client, hostname, key):
fingerprint = 'sha512$' + hashlib.sha512(key).hexdigest()
cfg = self.cfm.get_node_attributes(
self.node, ('pubkeys.ssh', 'pubkeys.addpolicy'))
if 'pubkeys.ssh' not in cfg[self.node]:
if ('pubkeys.addpolicy' in cfg[self.node] and
cfg[self.node]['pubkeys.addpolicy'] and
cfg[self.node]['pubkeys.addpolicy']['value'] == 'manual'):
raise cexc.PubkeyInvalid('New ssh key detected',
key, fingerprint, 'pubkeys.ssh')
auditlog = log.Logger('audit')
auditlog.log({'node': self.node, 'event': 'sshautoadd',
'fingerprint': fingerprint})
self.cfm.set_node_attributes(
{self.node: {'pubkeys.ssh': fingerprint}})
return True
elif cfg[self.node]['pubkeys.ssh']['value'] == fingerprint:
return True
raise cexc.PubKeyInvalid(
'Mismatched SSH host key detected', key, fingerprint, 'pubkeys.ssh'
)
class SshShell(conapi.Console):
def __init__(self, node, config, username='', password=''):
@ -33,7 +64,7 @@ class SshShell(conapi.Console):
self.nodeconfig = config
self.username = username
self.password = password
self.inputmode = 0 # 0 = username, 1 = password...
self.inputmode = 0 # 0 = username, 1 = password...
def recvdata(self):
while self.connected:
@ -45,7 +76,7 @@ class SshShell(conapi.Console):
def connect(self, callback):
# for now, we just use the nodename as the presumptive ssh destination
#TODO(jjohnson2): use a 'nodeipget' utility function for architectures
# TODO(jjohnson2): use a 'nodeipget' utility function for architectures
# that would rather not use the nodename as anything but an opaque
# identifier
self.datacallback = callback