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handler.lua
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handler.lua
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-- Copyright 2020 Patrick Huck
local resty_session = require "resty.session"
local constants = require "kong.constants"
local BasePlugin = require "kong.plugins.base_plugin"
local kong_utils = require "kong.tools.utils"
local acl_groups = require "kong.plugins.acl.groups"
local jwt_decoder = require "kong.plugins.jwt.jwt_parser"
local resty_cookie = require "resty.cookie"
-- local pl_pretty = require "pl.pretty"
-- local openssl = require('openssl')
local ngx = ngx
local kong = kong
local tostring = tostring
local CustomHandler = BasePlugin:extend()
CustomHandler.VERSION = "0.0-0"
CustomHandler.PRIORITY = 1004
function CustomHandler:new()
CustomHandler.super.new(self, "grant-proxy-oauth")
end
function CustomHandler:access(config)
CustomHandler.super.access(self)
local consumer = kong.client.get_consumer()
local credential = kong.client.get_credential()
-- check if already authenticated through global session plugin
if config.anonymous and consumer and credential then
local consumer_groups, err = acl_groups.get_consumer_groups(consumer.id)
if err then
return kong.response.exit(500, "failed to retrieve groups for " .. consumer.username)
end
set_consumer(consumer, credential, consumer_groups)
kong.log.notice(consumer.username .. " - session authenticated")
return
end
-- set up session and init with grant cookie
local opts = {name = config.cookie_name, storage = "redis", secret = config.secret}
opts.redis = {host = config.redis}
local session = resty_session.new(opts)
local cookie = resty_session.get_cookie(session)
if not cookie then
kong.log.info("anonymous - grant cookie missing")
return do_authentication(session, nil, config.anonymous)
end
-- URL-unescape cookie and check prefix
cookie = ngx.unescape_uri(cookie)
local prefix = string.sub(cookie, 1, 2)
if prefix ~= "s:" then
return kong.response.exit(500, "wrong cookie prefix")
end
-- get session ID
local sep_idx = string.find(cookie, '.', 3, true)
local session_id = string.sub(cookie, 3, sep_idx-1)
-- TODO check signature
-- local signed, err = sign(session_id, config.secret)
-- if err then
-- return kong.response.exit(500, err)
-- end
-- if session_id ~= signed then
-- return kong.response.exit(500, "invalid signature")
-- end
-- retrieve session data
local data, err = session.storage:open(session_id)
if err or not data then
kong.log.notice("anonymous - failed to retrieve grant session data")
return do_authentication(session, nil, config.anonymous)
end
-- serialize session data
data, err = session.serializer.deserialize(data)
if err then
kong.log.notice("anonymous - failed to deserialize grant session data")
return do_authentication(session, nil, config.anonymous)
end
-- check if oauth cycle completed
local response = data.grant.response
if type(response) ~= "table" then
kong.log.notice("anonymous - grant oauth cycle not completed yet")
return do_authentication(session, nil, config.anonymous)
end
-- check for error in token request by grant
if response.error then
kong.log.err(response.error)
destroy_grant_session(session, session_id)
return kong.response.exit(500, response.error)
end
-- extract email from provider response
local email = nil
local provider = data.grant.provider
if response.profile then
-- providers with profile_url and profile in response
email = response.profile.email
if type(email) ~= "string" then
for _, prof in ipairs(response.profile) do
if prof.primary then
email = prof.email
break
end
end
end
else
-- providers with id_token only (eg Portier)
local jwt, err = jwt_decoder:new(response.id_token)
if err then
local msg = "Bad token; " .. tostring(err)
kong.log.err(msg)
destroy_grant_session(session, session_id)
return kong.response.exit(401, msg)
end
if jwt.claims.email_verified then
email = jwt.claims.email
else
local msg = provider .. " email not verified"
kong.log.err(msg)
destroy_grant_session(session, session_id)
return kong.response.exit(401, msg)
end
end
-- catch bad email just in case
if type(email) ~= "string" then
local msg = "could not extract valid email from " .. provider .. " token response"
kong.log.err(msg)
destroy_grant_session(session, session_id)
return kong.response.exit(500, msg)
end
-- authenticate user with username <provider>:<email>
-- different accounts for different providers to avoid potential hijacking
local username = provider .. ":" .. email
do_authentication(session, username, config.anonymous)
-- destroy grant session
if kong.client.get_credential() then
destroy_grant_session(session, session_id)
end
end
-- see https://github.com/tj/node-cookie-signature/blob/master/index.js
-- function sign(val, secret)
-- local digest, err = openssl.hmac.digest('sha256', val, secret)
-- if err then
-- return nil, err
-- end
-- local encoded, err = openssl.base64(digest)
-- if err then
-- return nil, err
-- end
-- local signature = encoded -- TODO .replace(/\=+$/, '')
-- return val .. "." .. signature
-- end
function destroy_grant_session(session, session_id)
-- destroy grant session
local ok, err = session.storage:destroy(session_id)
if err or not ok then
local msg = "failed to destroy " .. session_id
if err then
msg = msg .. " - " .. err
end
return kong.response.exit(500, msg)
end
end
function do_authentication(session, consumerid_or_username, anonymous)
-- load consumer
local consumer = nil
if consumerid_or_username then
consumer = kong.client.load_consumer(consumerid_or_username, true)
if not consumer then
-- consumer not created by grant server yet
kong.log.notice("anonymous - user not created yet: " .. consumerid_or_username)
end
end
-- destroy resty_session
session.data = {}
session.present = nil
session.opened = nil
session.started = nil
session.closed = true
session.destroyed = true
-- load and authenticate anonymous consumer if needed
if not consumer then
consumer = kong.client.load_consumer(anonymous, true)
if not consumer then
-- anonymous consumer not created
local msg = "anonymous user not created: " .. anonymous
return kong.response.exit(500, msg)
end
local consumer_groups, err = acl_groups.get_consumer_groups(consumer.id)
if err then
return nil, err
end
return set_consumer(consumer, nil, consumer_groups)
end
-- authenticate user (incl. credential and groups)
local ok, err = authenticate(consumer)
if err then
return kong.response.exit(500, err)
end
if not ok then
return kong.response.exit(500, "failed to authenticate " .. consumer.username)
end
kong.log.notice(consumerid_or_username .. " authenticated")
end
function authenticate(consumer)
local cache_key = kong.db.keyauth_credentials:cache_key(consumer.id)
local credential, err = kong.cache:get(cache_key, nil, load_credential, {id = consumer.id})
if err then
return nil, err
end
local consumer_groups, err = acl_groups.get_consumer_groups(consumer.id)
if err then
return nil, err
end
return set_consumer(consumer, credential, consumer_groups)
end
function load_credential(consumer_pk)
for row, err in kong.db.keyauth_credentials:each_for_consumer(consumer_pk) do
if err then
return nil, err
end
return row
end
end
function set_cookie(key, value)
local cookie, err = resty_cookie:new()
if not cookie then
kong.log.err(err)
return
end
local ok, err = cookie:set({
key = key, value = value, path="/",
domain = ".materialsproject.org",
secure = false, samesite = "Strict"
})
if not ok then
kong.log.err(err)
return
end
end
function set_consumer(consumer, credential, groups)
local set_header = kong.service.request.set_header
local clear_header = kong.service.request.clear_header
if consumer.id then
set_header(constants.HEADERS.CONSUMER_ID, consumer.id)
else
clear_header(constants.HEADERS.CONSUMER_ID)
end
if consumer.custom_id then
set_header(constants.HEADERS.CONSUMER_CUSTOM_ID, consumer.custom_id)
else
clear_header(constants.HEADERS.CONSUMER_CUSTOM_ID)
end
if consumer.username then
set_header(constants.HEADERS.CONSUMER_USERNAME, consumer.username)
else
clear_header(constants.HEADERS.CONSUMER_USERNAME)
end
if groups then
set_header(constants.HEADERS.AUTHENTICATED_GROUPS, table.concat(groups, ", "))
ngx.ctx.authenticated_groups = groups
else
clear_header(constants.HEADERS.AUTHENTICATED_GROUPS)
end
if credential then
set_cookie("_csrf_token", "authenticated")
clear_header(constants.HEADERS.ANONYMOUS)
if constants.HEADERS.CREDENTIAL_IDENTIFIER then
set_header(constants.HEADERS.CREDENTIAL_IDENTIFIER, credential.id)
end
else
set_cookie("_csrf_token", "anonymous")
set_header(constants.HEADERS.ANONYMOUS, true)
if constants.HEADERS.CREDENTIAL_IDENTIFIER then
clear_header(constants.HEADERS.CREDENTIAL_IDENTIFIER)
end
end
kong.client.authenticate(consumer, credential)
return true
end
return CustomHandler