luci-base: switch to ubus sessions

Remove luci.sauth session storage implementation and offload the session
management to the rpcd ubus backend. Also depend on rpcd due to this.

6 files changed, 47 insertions, 160 deletions

diff --git a/modules/luci-base/Makefile b/modules/luci-base/Makefile
index 15aababbb..8337fea71 100644
--- a/modules/luci-base/Makefile
+++ b/modules/luci-base/Makefile
@@ -12,7 +12,7 @@ LUCI_TYPE:=mod
 LUCI_BASENAME:=base
 
 LUCI_TITLE:=LuCI core libraries
-LUCI_DEPENDS:=+lua +libuci-lua +luci-lib-nixio
+LUCI_DEPENDS:=+lua +libuci-lua +luci-lib-nixio +rpcd
 
 PKG_SOURCE:=LuaSrcDiet-0.12.1.tar.bz2
 PKG_SOURCE_URL:=https://luasrcdiet.googlecode.com/files
diff --git a/modules/luci-base/luasrc/dispatcher.lua b/modules/luci-base/luasrc/dispatcher.lua
index f7e16e77b..4bbd58f9d 100644
--- a/modules/luci-base/luasrc/dispatcher.lua
+++ b/modules/luci-base/luasrc/dispatcher.lua
@@ -333,8 +333,6 @@ function dispatch(request)
 	)
 
 	if track.sysauth then
-		local sauth = require "luci.sauth"
-
 		local authen = type(track.sysauth_authenticator) == "function"
 		 and track.sysauth_authenticator
 		 or authenticator[track.sysauth_authenticator]
@@ -349,7 +347,7 @@ function dispatch(request)
 			verifytoken = true
 		end
 
-		local sdat = sauth.read(sess)
+		local sdat = (util.ubus("session", "get", { ubus_rpc_session = sess }) or { }).values
 		local user
 
 		if sdat then
@@ -371,20 +369,28 @@ function dispatch(request)
 				if not user or not util.contains(accs, user) then
 					return
 				else
-					local sid = sess or luci.sys.uniqueid(16)
 					if not sess then
-						local token = luci.sys.uniqueid(16)
-						sauth.reap()
-						sauth.write(sid, {
-							user=user,
-							token=token,
-							secret=luci.sys.uniqueid(16)
-						})
-						ctx.urltoken.stok = token
+						local sdat = util.ubus("session", "create", { timeout = luci.config.sauth.sessiontime })
+						if sdat then
+							local token = luci.sys.uniqueid(16)
+							util.ubus("session", "set", {
+								ubus_rpc_session = sdat.ubus_rpc_session,
+								values = {
+									user = user,
+									token = token,
+									section = luci.sys.uniqueid(16)
+								}
+							})
+							sess = sdat.ubus_rpc_session
+							ctx.urltoken.stok = token
+						end
+					end
+
+					if sess then
+						luci.http.header("Set-Cookie", "sysauth=" .. sess.."; path="..build_url())
+						ctx.authsession = sess
+						ctx.authuser = user
 					end
-					luci.http.header("Set-Cookie", "sysauth=" .. sid.."; path="..build_url())
-					ctx.authsession = sid
-					ctx.authuser = user
 				end
 			else
 				luci.http.status(403, "Forbidden")
diff --git a/modules/luci-base/luasrc/sauth.lua b/modules/luci-base/luasrc/sauth.lua
deleted file mode 100644
index 32f172dcd..000000000
--- a/modules/luci-base/luasrc/sauth.lua
+++ /dev/null
@@ -1,127 +0,0 @@
---[[
-
-Session authentication
-(c) 2008 Steven Barth <steven@midlink.org>
-
-Licensed 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
-
-$Id$
-
-]]--
-
---- LuCI session library.
-module("luci.sauth", package.seeall)
-require("luci.util")
-require("luci.sys")
-require("luci.config")
-local nixio = require "nixio", require "nixio.util"
-local fs = require "nixio.fs"
-
-
-luci.config.sauth = luci.config.sauth or {}
-sessionpath = luci.config.sauth.sessionpath
-sessiontime = tonumber(luci.config.sauth.sessiontime) or 15 * 60
-
---- Prepare session storage by creating the session directory.
-function prepare()
-	fs.mkdir(sessionpath, 700)
-	if not sane() then
-		error("Security Exception: Session path is not sane!")
-	end
-end
-
-local function _read(id)
-	local blob = fs.readfile(sessionpath .. "/" .. id)
-	return blob
-end
-
-local function _write(id, data)
-	local f = nixio.open(sessionpath .. "/" .. id, "w", 600)
-	f:writeall(data)
-	f:close()
-end
-
-local function _checkid(id)
-	return not not (id and #id == 32 and id:match("^[a-fA-F0-9]+$"))
-end
-
---- Write session data to a session file.
--- @param id	Session identifier
--- @param data	Session data table
-function write(id, data)
-	if not sane() then
-		prepare()
-	end
-
-	assert(_checkid(id), "Security Exception: Session ID is invalid!")
-	assert(type(data) == "table", "Security Exception: Session data invalid!")
-
-	data.atime = luci.sys.uptime()
-
-	_write(id, luci.util.get_bytecode(data))
-end
-
---- Read a session and return its content.
--- @param id	Session identifier
--- @return		Session data table or nil if the given id is not found
-function read(id)
-	if not id or #id == 0 then
-		return nil
-	end
-
-	assert(_checkid(id), "Security Exception: Session ID is invalid!")
-
-	if not sane(sessionpath .. "/" .. id) then
-		return nil
-	end
-
-	local blob = _read(id)
-	local func = loadstring(blob)
-	setfenv(func, {})
-
-	local sess = func()
-	assert(type(sess) == "table", "Session data invalid!")
-
-	if sess.atime and sess.atime + sessiontime < luci.sys.uptime() then
-		kill(id)
-		return nil
-	end
-
-	-- refresh atime in session
-	write(id, sess)
-
-	return sess
-end
-
---- Check whether Session environment is sane.
--- @return Boolean status
-function sane(file)
-	return luci.sys.process.info("uid")
-			== fs.stat(file or sessionpath, "uid")
-		and fs.stat(file or sessionpath, "modestr")
-			== (file and "rw-------" or "rwx------")
-end
-
---- Kills a session
--- @param id	Session identifier
-function kill(id)
-	assert(_checkid(id), "Security Exception: Session ID is invalid!")
-	fs.unlink(sessionpath .. "/" .. id)
-end
-
---- Remove all expired session data files
-function reap()
-	if sane() then
-		local id
-		for id in nixio.fs.dir(sessionpath) do
-			if _checkid(id) then
-				-- reading the session will kill it if it is expired
-				read(id)
-			end
-		end
-	end
-end
diff --git a/modules/luci-mod-admin-full/luasrc/controller/admin/index.lua b/modules/luci-mod-admin-full/luasrc/controller/admin/index.lua
index 4e832529d..64a620ca2 100644
--- a/modules/luci-mod-admin-full/luasrc/controller/admin/index.lua
+++ b/modules/luci-mod-admin-full/luasrc/controller/admin/index.lua
@@ -38,9 +38,11 @@ end
 
 function action_logout()
 	local dsp = require "luci.dispatcher"
-	local sauth = require "luci.sauth"
+	local utl = require "luci.util"
 	if dsp.context.authsession then
-		sauth.kill(dsp.context.authsession)
+		utl.ubus("session", "destroy", {
+			ubus_rpc_session = dsp.context.authsession
+		})
 		dsp.context.urltoken.stok = nil
 	end
 
diff --git a/modules/luci-mod-admin-mini/luasrc/controller/mini/index.lua b/modules/luci-mod-admin-mini/luasrc/controller/mini/index.lua
index 9d6a38ed4..6800f9bfd 100644
--- a/modules/luci-mod-admin-mini/luasrc/controller/mini/index.lua
+++ b/modules/luci-mod-admin-mini/luasrc/controller/mini/index.lua
@@ -37,9 +37,11 @@ end
 
 function action_logout()
 	local dsp = require "luci.dispatcher"
-	local sauth = require "luci.sauth"
+	local utl = require "luci.util"
 	if dsp.context.authsession then
-		sauth.kill(dsp.context.authsession)
+		utl.ubus("session", "destroy", {
+			ubus_rpc_session = dsp.context.authsession
+		})
 		dsp.context.urltoken.stok = nil
 	end
 
diff --git a/modules/luci-mod-rpc/luasrc/controller/rpc.lua b/modules/luci-mod-rpc/luasrc/controller/rpc.lua
index 359184c74..92947168e 100644
--- a/modules/luci-mod-rpc/luasrc/controller/rpc.lua
+++ b/modules/luci-mod-rpc/luasrc/controller/rpc.lua
@@ -25,7 +25,7 @@ function index()
 	local function authenticator(validator, accs)
 		local auth = luci.http.formvalue("auth", true)
 		if auth then -- if authentication token was given
-			local sdat = luci.sauth.read(auth)
+			local sdat = (luci.util.ubus("session", "get", { ubus_rpc_session = auth }) or { }).values
 			if sdat then -- if given token is valid
 				if sdat.user and luci.util.contains(accs, sdat.user) then
 					return sdat.user, auth
@@ -49,7 +49,6 @@ end
 
 function rpc_auth()
 	local jsonrpc = require "luci.jsonrpc"
-	local sauth   = require "luci.sauth"
 	local http    = require "luci.http"
 	local sys     = require "luci.sys"
 	local ltn12   = require "luci.ltn12"
@@ -62,17 +61,22 @@ function rpc_auth()
 		local sid, token, secret
 
 		if sys.user.checkpasswd(user, pass) then
-			sid = sys.uniqueid(16)
-			token = sys.uniqueid(16)
-			secret = sys.uniqueid(16)
-
-			http.header("Set-Cookie", "sysauth=" .. sid.."; path=/")
-			sauth.reap()
-			sauth.write(sid, {
-				user=user,
-				token=token,
-				secret=secret
-			})
+			local sdat = util.ubus("session", "create", { timeout = luci.config.sauth.sessiontime })
+			if sdat then
+				sid = sdat.ubus_rpc_session
+				token = sys.uniqueid(16)
+				secret = sys.uniqueid(16)
+
+				http.header("Set-Cookie", "sysauth="..sid.."; path=/")
+				util.ubus("session", "set", {
+					ubus_rpc_session = sid,
+					values = {
+						user = user,
+						token = token,
+						secret = secret
+					}
+				})
+			end
 		end
 
 		return sid and {sid=sid, token=token, secret=secret}