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|
(* Ocsigen
* http://www.ocsigen.org
* Module accesscontrol.ml
* Copyright (C) 2007 Vincent Balat, Stphane Glondu
* Laboratoire PPS - CNRS Universit Paris Diderot
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, with linking exception;
* either version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*)
(** Filtering requests in the configuration file *)
(*
Then load it dynamically from Ocsigen's config file:
<extension module=".../accesscontrol.cmo"/>
*)
open Printf
open Lwt
open Ocsigen_extensions
open Simplexmlparser
open Ocsigen_http_frame
(*****************************************************************************)
(* Parsing a condition *)
let rec parse_condition = function
| Element ("ip", ["value", s], []) ->
let ip_with_mask =
try
Ocsigen_lib.parse_ip s
with Failure _ ->
badconfig "Bad ip/netmask [%s] in <ip> condition" s
in
(fun ri ->
let r =
Ocsigen_lib.match_ip ip_with_mask
(Lazy.force ri.ri_remote_ip_parsed)
in
if r then
Ocsigen_messages.debug2 (sprintf "--Access control (ip): %s matches %s" ri.ri_remote_ip s)
else
Ocsigen_messages.debug2 (sprintf "--Access control (ip): %s does not match %s" ri.ri_remote_ip s);
r)
| Element ("ip" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("port", ["value", s], []) ->
let port =
try
int_of_string s
with Failure _ ->
badconfig "Bad port [%s] in <port> condition" s
in
(fun ri ->
let r = ri.ri_server_port = port in
if r then
Ocsigen_messages.debug2
(sprintf "--Access control (port): %d accepted" port)
else
Ocsigen_messages.debug2
(sprintf "--Access control (port): %d not accepted (%d expected)" ri.ri_server_port port);
r)
| Element ("port" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("ssl", [], []) ->
(fun ri ->
let r = ri.ri_ssl in
if r then
Ocsigen_messages.debug2 "--Access control (ssl): accepted"
else
Ocsigen_messages.debug2 "--Access control (ssl): not accepted";
r)
| Element ("ssl" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("header", ["name", name; "regexp", reg], []) ->
let regexp =
try
Netstring_pcre.regexp ("^"^reg^"$")
with Failure _ ->
badconfig "Bad regular expression [%s] in <header> condition" reg
in
(fun ri ->
let r =
List.exists
(fun a ->
let r = Netstring_pcre.string_match regexp a 0 <> None in
if r then Ocsigen_messages.debug2 (sprintf "--Access control (header): header %s matches \"%s\"" name reg);
r)
(Http_headers.find_all
(Http_headers.name name)
ri.ri_http_frame.Ocsigen_http_frame.frame_header.Ocsigen_http_frame.Http_header.headers)
in
if not r then Ocsigen_messages.debug2 (sprintf "--Access control (header): header %s does not match \"%s\"" name reg);
r)
| Element ("header" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("method", ["value", s], []) ->
let meth =
try
Framepp.method_of_string s
with Failure _ ->
badconfig "Bad method [%s] in <method> condition" s
in
(fun ri ->
let r = meth = ri.ri_method in
if r then Ocsigen_messages.debug
(fun () -> sprintf "--Access control (method): %s matches %s" (Framepp.string_of_method ri.ri_method) s)
else Ocsigen_messages.debug
(fun () -> sprintf "--Access control (method): %s does not match %s" (Framepp.string_of_method ri.ri_method) s);
r)
| Element ("method" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("protocol", ["value", s], []) ->
let pr =
try
Framepp.proto_of_string s
with Failure _ ->
badconfig "Bad protocol [%s] in <protocol> condition" s
in
(fun ri ->
let r = pr = ri.ri_protocol in
if r then Ocsigen_messages.debug
(fun () -> sprintf "--Access control (protocol): %s matches %s" (Framepp.string_of_proto ri.ri_protocol) s)
else Ocsigen_messages.debug
(fun () -> sprintf "--Access control (protocol): %s does not match %s" (Framepp.string_of_proto ri.ri_protocol) s);
r)
| Element ("protocol" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("path", ["regexp", s], []) ->
let regexp =
try
Netstring_pcre.regexp ("^"^s^"$")
with Failure _ ->
badconfig "Bad regular expression [%s] in <path> condition" s
in
(fun ri ->
let r =
Netstring_pcre.string_match
regexp ri.ri_sub_path_string 0 <> None
in
if r then Ocsigen_messages.debug
(fun () -> sprintf "--Access control (path): \"%s\" matches \"%s\"" ri.ri_sub_path_string s)
else Ocsigen_messages.debug
(fun () -> sprintf "--Access control (path): \"%s\" does not match \"%s\"" ri.ri_sub_path_string s);
r)
| Element ("path" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("and", [], sub) ->
let sub = List.map parse_condition sub in
(fun ri -> List.for_all (fun cond -> cond ri) sub)
| Element ("and" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("or", [], sub) ->
let sub = List.map parse_condition sub in
(fun ri -> List.exists (fun cond -> cond ri) sub)
| Element ("or" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("not", [], [sub]) ->
let sub = parse_condition sub in
(fun ri -> not (sub ri))
| Element ("not" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| _ ->
badconfig "Bad syntax for condition"
(*****************************************************************************)
(* Parsing filters *)
let parse_config parse_fun = function
| Element ("if", [], sub) ->
let (condition, sub) = match sub with
| cond::q -> (parse_condition cond, q)
| _ -> badconfig "Bad condition in <if>"
in
let (ithen, sub) = match sub with
| Element("then", [], ithen)::q -> (parse_fun ithen, q)
| _ -> badconfig "Bad <then> branch in <if>"
in
let (ielse, sub) = match sub with
| Element ("else", [], ielse)::([] as q) -> (parse_fun ielse, q)
| [] -> (parse_fun [], [])
| _ -> badconfig "Bad <else> branch in <if>"
in
(function
| Ocsigen_extensions.Req_found (ri, _)
| Ocsigen_extensions.Req_not_found (_, ri) ->
Lwt.return
(if condition ri.request_info then begin
Ocsigen_messages.debug2 "--Access control: => going into <then> branch";
Ocsigen_extensions.Ext_sub_result ithen
end
else begin
Ocsigen_messages.debug2 "--Access control: => going into <else> branch, if any";
Ocsigen_extensions.Ext_sub_result ielse
end))
| Element ("if" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("notfound", [], []) ->
(fun rs ->
Ocsigen_messages.debug2 "--Access control: taking in charge 404";
Lwt.return (Ocsigen_extensions.Ext_stop_all
(Ocsigen_http_frame.Cookies.empty, 404)))
| Element ("notfound" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("nextsite", [], []) ->
(function
| Ocsigen_extensions.Req_found (_, r) ->
Lwt.return (Ocsigen_extensions.Ext_found_stop
(fun () -> Lwt.return r))
| Ocsigen_extensions.Req_not_found (err, ri) ->
Lwt.return (Ocsigen_extensions.Ext_stop_site
(Ocsigen_http_frame.Cookies.empty, 404)))
| Element ("nexthost", [], []) ->
(function
| Ocsigen_extensions.Req_found (_, r) ->
Lwt.return (Ocsigen_extensions.Ext_found_stop
(fun () -> Lwt.return r))
| Ocsigen_extensions.Req_not_found (err, ri) ->
Lwt.return (Ocsigen_extensions.Ext_stop_host
(Ocsigen_http_frame.Cookies.empty, 404)))
| Element ("nextsite" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("stop", [], []) ->
(function
| Ocsigen_extensions.Req_found (_, r) ->
Lwt.return (Ocsigen_extensions.Ext_found_stop
(fun () -> Lwt.return r))
| Ocsigen_extensions.Req_not_found (err, ri) ->
Lwt.return (Ocsigen_extensions.Ext_stop_all
(Ocsigen_http_frame.Cookies.empty, 404)))
| Element ("stop" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("forbidden", [], []) ->
(fun rs ->
Ocsigen_messages.debug2 "--Access control: taking in charge 403";
Lwt.return (Ocsigen_extensions.Ext_stop_all
(Ocsigen_http_frame.Cookies.empty, 403)))
| Element ("forbidden" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("iffound", [], sub) ->
let ext = parse_fun sub in
(function
| Ocsigen_extensions.Req_found (_, _) ->
Lwt.return (Ext_sub_result ext)
| Ocsigen_extensions.Req_not_found (err, ri) ->
Lwt.return (Ocsigen_extensions.Ext_next err))
| Element ("iffound" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element ("ifnotfound", [], sub) ->
let ext = parse_fun sub in
(function
| Ocsigen_extensions.Req_found (_, r) ->
Lwt.return (Ocsigen_extensions.Ext_found
(fun () -> Lwt.return r))
| Ocsigen_extensions.Req_not_found (err, ri) ->
Lwt.return (Ext_sub_result ext))
| Element ("ifnotfound", [("code", s)], sub) ->
let ext = parse_fun sub in
let r = Netstring_pcre.regexp ("^"^s^"$") in
(function
| Ocsigen_extensions.Req_found (_, r) ->
Lwt.return (Ocsigen_extensions.Ext_found
(fun () -> Lwt.return r))
| Ocsigen_extensions.Req_not_found (err, ri) ->
if Netstring_pcre.string_match r (string_of_int err) 0 <> None then
Lwt.return (Ext_sub_result ext)
else
Lwt.return (Ocsigen_extensions.Ext_next err))
| Element ("ifnotfound" as s, _, _) -> badconfig "Bad syntax for tag %s" s
| Element (t, _, _) -> raise (Bad_config_tag_for_extension t)
| _ -> badconfig "(accesscontrol extension) Bad data"
(*****************************************************************************)
(** Registration of the extension *)
let () = register_extension
~name:"accesscontrol"
~fun_site:(fun _ _ _ -> parse_config)
~user_fun_site:(fun _ _ _ _ -> parse_config)
()
|
