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server.py
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#!/usr/bin/python
import json
import crypto
import accessrules
import logging
import traceback
import basicauth
class Context:
def __init__(self, user):
self.user = user
self.admin = False
class AccessDeniedException(Exception):
pass
class Server:
def __init__(self, system):
self.system = system
self.crypto = crypto.Crypto()
self.rules = accessrules.AccessRules(self.system)
self.log = logging.getLogger("server")
def createContext(self, username):
self.log.info("Creating context for " + username)
ctx = Context(username)
if self.rules.isAdmin(username):
ctx.admin = True
return ctx
def mockAuthentication(self, username):
self.log.warning("Mocking user " + username)
return self.createContext(username)
def validateAuthentication(self, username, password):
try:
if self.system.getUser(username) == None:
self.log.warning("Unknown user: " + username)
elif self.rules.isEnabled(username):
userdata = self.system.getUser(username)
data = None
if self.rules.canAuthenticateWithPassword(username):
try:
privKey = self.system.getUserPrivateKey(username, password)
if privKey != None:
return self.createContext(username)
except:
traceback.print_exc()
# ignore and move on to the next auth type
pass
else:
try:
data = json.loads(password)
except json.decoder.JSONDecodeError as e:
self.log.warning(
"%s attempted password authenticaion when password authentication is disabled: %s"
% (username, e)
)
return None
# The data might have already been parsed
if data is None:
data = json.loads(password)
token = data["token"]
signedToken = data["signed"]
pub = self.system.getUserPublicKey(username)
if self.crypto.verify(pub, token, signedToken):
return self.createContext(username)
else:
self.log.warning("Failed to verify authentication for " + username)
else:
self.log.warning("Disabled user " + username + " attempted to login")
except:
self.log.exception("Failed login for user: " + username)
return None
def validateAuthenticationHeader(self, header):
if header != None and header.find("Basic ") == 0:
user = ""
try:
(user, password) = basicauth.decode(header)
return self.validateAuthentication(user, password)
except:
self.log.exception("Failed login for user: " + user)
return None
def _getUserData(self, ctx, user, obj):
ret = {}
attrList = ["displayName"]
if self.rules.canUserExportPrivateKey(ctx.user, user):
attrList.append("encryptedPrivateKey")
if self.rules.canUserExportPublicKey(ctx.user, user):
attrList.append("publicKey")
attrList.append("keyType")
if self.rules.canUserSeeAttributes(ctx.user, user):
attrList.append("enabled")
attrList.append("passwordAuth")
for key in attrList:
if key in obj:
ret[key] = obj[key]
return ret
def listUsers(self, ctx):
ret = {}
data = self.system.listUsers()
for user in data.keys():
ret[user] = self._getUserData(ctx, user, data[user])
return ret
def getUser(self, ctx, user):
data = self.system.getUser(user)
if data == None:
return None
return self._getUserData(ctx, user, data)
def generateKeysForUser(self, ctx, user, password):
if not self.rules.canChangeUserKeys(ctx.user, user):
raise AccessDeniedException()
self.system.generateKeysForUser(user, password)
userdata = self.system.getUser(user)
return userdata["publicKey"]
def getPublicKeyType(self, pub):
return self.crypto.getPublicKeyType(pub)
def getUserEncryptedPrivateKey(self, ctx, user):
if not self.rules.canUserExportPrivateKey(ctx.user, user):
raise AccessDeniedException()
data = self.system.getUser(user)
if data != None and "encryptedPrivateKey" in data:
return data["encryptedPrivateKey"]
return None
def getUserPublicKey(self, ctx, user):
if not self.rules.canUserExportPublicKey(ctx.user, user):
raise AccessDeniedException()
data = self.system.getUser(user)
if data != None and "publicKey" in data:
return data["publicKey"]
return None
def setUserPublicKey(self, ctx, user, pem, keyType):
if not self.rules.canChangeUserKeys(ctx.user, user):
raise AccessDeniedException()
return self.system.setUserPublicKey(user, pem, keyType)
def setUserEncryptedPrivateKey(self, ctx, user, data):
if not self.rules.canChangeUserKeys(ctx.user, user):
raise AccessDeniedException()
return self.system.setUserPrivateKey(user, data)
def addUser(self, ctx, user, post_body):
if not self.rules.canCreateUser(ctx.user):
raise AccessDeniedException()
displayName = user
data = {}
if len(post_body) > 0:
data = json.loads(post_body)
if "displayName" in data:
displayName = data["displayName"]
self.system.addUser(user, displayName)
if "publicKey" in data:
self.system.setUserPublicKey(user, data["publicKey"])
if "encryptedPrivateKey" in data:
self.system.setUserPrivateKey(user, data["encryptedPrivateKey"])
return True
def hasDataChanged(self, oldData, newData, key):
if key in oldData and key in newData:
return oldData[key] != newData[key]
return False
def updateUser(self, ctx, user, post_body):
oldData = self.getUser(ctx, user)
data = {}
if len(post_body) > 0:
data = json.loads(post_body)
if self.rules.canUpdateUserProfile(ctx.user, user):
if self.hasDataChanged(oldData, data, "displayName"):
self.system.setUserDisplayName(user, data["displayName"])
if self.hasDataChanged(oldData, data, "passwordAuth"):
if data["passwordAuth"] == "Y":
self.system.enablePasswordAuth(user)
elif data["passwordAuth"] == "N":
self.system.disablePasswordAuth(user)
if self.hasDataChanged(oldData, data, "enabled"):
if data["enabled"] == "Y" and self.rules.canUserEnableUser(ctx.user, user):
self.system.enableUser(user)
elif data["enabled"] == "N" and self.rules.canUserDisableUser(
ctx.user, user
):
self.system.disableUser(user)
if self.rules.canChangeUserKeys(ctx.user, user):
if self.hasDataChanged(oldData, data, "publicKey") and "keyType" in data:
self.system.setUserPublicKey(user, data["publicKey"], data["keyType"])
if self.hasDataChanged(oldData, data, "encryptedPrivateKey"):
self.system.setUserPrivateKey(user, data["encryptedPrivateKey"])
return True
def addSecret(self, ctx, post_body):
data = {}
if len(post_body) > 0:
data = json.loads(post_body)
encryptedKey = None
if "encryptedKey" in data:
encryptedKey = data["encryptedKey"]
else:
encryptedKey = data["users"][ctx.user]["encryptedKey"]
encryptedSecret = data["encryptedSecret"]
hmac = data["hmac"]
sid = self.system.addSecret(ctx.user, "1", encryptedKey, encryptedSecret, hmac)
if "users" in data:
for user in data["users"].keys():
if user != ctx.user:
self.system.shareSecret(
sid, user, data["users"][user]["encryptedKey"]
)
return sid
def shareSecret(self, ctx, sid, user, post_body):
if not self.system.doesUserHaveShareAccess(ctx.user, sid):
raise AccessDeniedException()
data = {}
if len(post_body) > 0:
data = json.loads(post_body)
encryptedKey = data["encryptedKey"]
self.system.shareSecret(sid, user, encryptedKey)
ret = self.system.getSecret(sid)
ret["sid"] = sid
return ret
def unshareSecret(self, ctx, sid, user):
if not self.system.doesUserHaveUnshareAccess(ctx.user, sid):
raise AccessDeniedException()
self.system.unshareSecret(sid, user)
ret = self.system.getSecret(sid)
ret["sid"] = sid
return ret
def updateSecret(self, ctx, sid, post_body):
if not self.system.doesUserHaveWriteAccess(ctx.user, sid):
raise AccessDeniedException()
data = {}
if len(post_body) > 0:
data = json.loads(post_body)
encryptedSecret = data["encryptedSecret"]
hmac = data["hmac"]
return self.system.updateSecret(sid, encryptedSecret, hmac)
def getSecret(self, ctx, sid):
if not self.system.doesUserHaveReadAccess(ctx.user, sid):
raise AccessDeniedException()
ret = self.system.getSecret(sid)
ret["sid"] = sid
return ret
def getMySecrets(self, ctx, user):
if ctx.user == user:
return self.system.getSecretsForUser(ctx.user)
return None