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| --
-- Licensed to the Apache Software Foundation (ASF) under one or more
-- contributor license agreements. See the NOTICE file distributed with
-- this work for additional information regarding copyright ownership.
-- The ASF licenses this file to You under the Apache License, Version 2.0
-- (the "License"); you may not use this file except in compliance with
-- the License. You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
local core = require("apisix.core")
local jwt = require("resty.jwt")
local ck = require("resty.cookie")
local consumer_mod = require("apisix.consumer")
local resty_random = require("resty.random")
local ngx_encode_base64 = ngx.encode_base64
local ngx_decode_base64 = ngx.decode_base64
local ipairs = ipairs
local ngx = ngx
local ngx_time = ngx.time
local sub_str = string.sub
local plugin_name = "jwt-diy"
local pcall = pcall
local lrucache = core.lrucache.new({
type = "plugin",
})
local schema = {
type = "object",
additionalProperties = false,
properties = {},
}
local consumer_schema = {
type = "object",
-- can't use additionalProperties with dependencies
-- additionalProperties = false,
properties = {
key = {type = "string"},
secret = {type = "string"},
password = {type = "string"}, --changed
algorithm = {
type = "string",
enum = {"HS256", "HS512", "RS256"},
default = "HS256"
},
exp = {type = "integer", minimum = 1, default = 86400},
base64_secret = {
type = "boolean",
default = false
}
},
dependencies = {
algorithm = {
oneOf = {
{
properties = {
algorithm = {
enum = {"HS256", "HS512"},
default = "HS256"
},
},
},
{
properties = {
public_key = {type = "string"},
private_key= {type = "string"},
algorithm = {
enum = {"RS256"},
},
},
required = {"public_key", "private_key"},
}
}
}
},
required = {"key","password"}, --changed
}
local _M = {
version = 0.1,
priority = 1,
type = 'auth',
name = plugin_name,
schema = schema,
consumer_schema = consumer_schema
}
local create_consume_cache
do
local consumer_names = {}
function create_consume_cache(consumers)
core.table.clear(consumer_names)
for _, consumer in ipairs(consumers.nodes) do
core.log.info("consumer node: ", core.json.delay_encode(consumer))
consumer_names[consumer.auth_conf.key] = consumer
end
return consumer_names
end
end -- do
function _M.check_schema(conf, schema_type)
core.log.info("input conf: ", core.json.delay_encode(conf))
local ok, err
if schema_type == core.schema.TYPE_CONSUMER then
ok, err = core.schema.check(consumer_schema, conf)
else
ok, err = core.schema.check(schema, conf)
end
if not ok then
return false, err
end
if schema_type == core.schema.TYPE_CONSUMER then
if conf.algorithm ~= "RS256" and not conf.secret then
conf.secret = ngx_encode_base64(resty_random.bytes(32, true))
elseif conf.base64_secret then
if ngx_decode_base64(conf.secret) == nil then
return false, "base64_secret required but the secret is not in base64 format"
end
end
if conf.algorithm == "RS256" then
if not conf.public_key then
return false, "missing valid public key"
end
if not conf.private_key then
return false, "missing valid private key"
end
end
end
return true
end
local function fetch_jwt_token(ctx)
local token = core.request.header(ctx, "authorization")
if token then
local prefix = sub_str(token, 1, 7)
if prefix == 'Bearer ' or prefix == 'bearer ' then
return sub_str(token, 8)
end
return token
end
token = ctx.var.arg_jwt
if token then
return token
end
local cookie, err = ck:new()
if not cookie then
return nil, err
end
local val, err = cookie:get("jwt")
return val, err
end
local function get_secret(conf)
if conf.base64_secret then
return ngx_decode_base64(conf.secret)
end
return conf.secret
end
local function get_real_payload(key, auth_conf, payload)
local real_payload = {
key = key,
exp = ngx_time() + auth_conf.exp
}
if payload then
local extra_payload = core.json.decode(payload)
core.table.merge(real_payload, extra_payload)
end
return real_payload
end
local function sign_jwt_with_HS(key, auth_conf, payload)
local auth_secret = get_secret(auth_conf)
local ok, jwt_token = pcall(jwt.sign, _M,
auth_secret,
{
header = {
typ = "JWT",
alg = auth_conf.algorithm
},
payload = get_real_payload(key, auth_conf, payload)
}
)
if not ok then
core.log.warn("failed to sign jwt, err: ", jwt_token.reason)
core.response.exit(500, "failed to sign jwt")
end
return jwt_token
end
local function sign_jwt_with_RS256(key, auth_conf, payload)
local ok, jwt_token = pcall(jwt.sign, _M,
auth_conf.private_key,
{
header = {
typ = "JWT",
alg = auth_conf.algorithm,
x5c = {
auth_conf.public_key,
}
},
payload = get_real_payload(key, auth_conf, payload)
}
)
if not ok then
core.log.warn("failed to sign jwt, err: ", jwt_token.reason)
core.response.exit(500, "failed to sign jwt")
end
return jwt_token
end
local function algorithm_handler(consumer)
if not consumer.auth_conf.algorithm or consumer.auth_conf.algorithm == "HS256"
or consumer.auth_conf.algorithm == "HS512" then
return sign_jwt_with_HS, get_secret(consumer.auth_conf)
elseif consumer.auth_conf.algorithm == "RS256" then
return sign_jwt_with_RS256, consumer.auth_conf.public_key
end
end
function _M.rewrite(conf, ctx)
local jwt_token, err = fetch_jwt_token(ctx)
if not jwt_token then
if err and err:sub(1, #"no cookie") ~= "no cookie" then
core.log.error("failed to fetch JWT token: ", err)
end
return 401, {message = "Missing JWT token in request"}
end
local jwt_obj = jwt:load_jwt(jwt_token)
core.log.info("jwt object: ", core.json.delay_encode(jwt_obj))
if not jwt_obj.valid then
return 401, {message = jwt_obj.reason}
end
local user_key = jwt_obj.payload and jwt_obj.payload.key
if not user_key then
return 401, {message = "missing user key in JWT token"}
end
local consumer_conf = consumer_mod.plugin(plugin_name)
if not consumer_conf then
return 401, {message = "Missing related consumer"}
end
local consumers = lrucache("consumers_key", consumer_conf.conf_version,
create_consume_cache, consumer_conf)
local consumer = consumers[user_key]
if not consumer then
return 401, {message = "Invalid user key in JWT token"}
end
core.log.info("consumer: ", core.json.delay_encode(consumer))
local _, auth_secret = algorithm_handler(consumer)
jwt_obj = jwt:verify_jwt_obj(auth_secret, jwt_obj)
core.log.info("jwt object: ", core.json.delay_encode(jwt_obj))
if not jwt_obj.verified then
return 401, {message = jwt_obj.reason}
end
consumer_mod.attach_consumer(ctx, consumer, consumer_conf)
core.log.info("hit jwt-auth rewrite")
end
local function gen_token()
local args = ngx.req.get_uri_args()
if not args or not args.key or not args.password then --changed
return core.response.exit(400)
end
local key = args.key
local payload = args.payload
local password = args.password --changed
if payload then
payload = ngx.unescape_uri(payload)
end
local consumer_conf = consumer_mod.plugin(plugin_name)
if not consumer_conf then
return core.response.exit(404)
end
local consumers = lrucache("consumers_key", consumer_conf.conf_version,
create_consume_cache, consumer_conf)
core.log.info("consumers: ", core.json.delay_encode(consumers))
local consumer = consumers[key]
if ((not consumer) or (password ~= consumer.auth_conf.password)) then --changed
return core.response.exit(404)
end
core.log.info("consumer: ", core.json.delay_encode(consumer))
local sign_handler, _ = algorithm_handler(consumer)
local jwt_token = sign_handler(key, consumer.auth_conf, payload)
if jwt_token then
return core.response.exit(200, jwt_token)
end
return core.response.exit(404)
end
function _M.api()
return {
{
methods = {"GET"},
uri = "/apisix/plugin/jwt/sign",
handler = gen_token,
}
}
end
return _M
|
