(* HCoop Domtool (http://hcoop.sourceforge.net/)
* Copyright (c) 2006-2007, Adam Chlipala
+ * Copyright (c) 2011 Clinton Ebadi
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*)
-(* Firewall rule querying *)
+(* Firewall management *)
+
+(* Contains portions from Fwtool Copyright (C) 2005 Adam Chlipala, GPL v2 or later *)
structure Firewall :> FIREWALL = struct
+type firewall_rules = { server_rules : ((string * string) list DataStructures.StringMap.map),
+ client_rules : ((string * string) list DataStructures.StringMap.map)}
+
+structure StringMap = DataStructures.StringMap
+
+fun parseRules () =
+ let
+ val inf = TextIO.openIn Config.Firewall.firewallRules
+ val out_lines = ref StringMap.empty
+ val in_lines = ref StringMap.empty
+
+ fun confLine r (node, uname, line) =
+ let
+ val line = (node, String.concat ["\t", line, "\n"])
+ val lines = case StringMap.find (!r, uname) of
+ NONE => []
+ | SOME lines => lines
+ in
+ r := StringMap.insert (!r, uname, line :: lines)
+ end
+
+ val confLine_in = confLine in_lines
+ val confLine_out = confLine out_lines
+
+ fun parsePorts ports =
+ case String.fields (fn ch => ch = #",") ports of
+ [pp] => pp
+ | pps => String.concat ["(", String.concatWith " " pps, ")"]
+
+ fun parseHosts addr hosts =
+ case hosts of
+ [] => ""
+ | [host] => String.concat [" ", addr, " ", host]
+ | _ => String.concat [" ", addr, " (", String.concatWith " " hosts, ")"]
+
+ fun loop () =
+ case TextIO.inputLine inf of
+ NONE => ()
+ | SOME line =>
+ case String.tokens Char.isSpace line of
+ node :: uname :: rest =>
+ (case rest of
+ "Client" :: ports :: hosts =>
+ confLine_out (node, uname, String.concat ["dport ", parsePorts ports, parseHosts "daddr" hosts, " ACCEPT;"])
+ | "Server" :: ports :: hosts =>
+ confLine_in (node, uname, String.concat ["dport ", parsePorts ports, parseHosts "saddr" hosts, " ACCEPT;"])
+ | ["ProxiedServer", ports] =>
+ (* should this also allow access on lo? fixme: open output ports on apache node *)
+ confLine_in (node, uname, String.concat ["saddr $WEBNODES dport ", parsePorts ports, " ACCEPT;"])
+ | ["LocalServer", ports] =>
+ confLine_in (node, uname, String.concat ["saddr 127.0.0.1/8 dport ", parsePorts ports, " ACCEPT;"])
+ | _ => print "Invalid config line\n";
+ loop ())
+ | _ => loop ()
+ val _ = loop ()
+ in
+ {server_rules = !in_lines, client_rules = !out_lines}
+ end
+
fun query uname =
let
- val inf = TextIO.openIn "/etc/firewall/users.rules"
-
- fun loop rules =
- case TextIO.inputLine inf of
- NONE => List.rev rules
- | SOME line =>
- if String.sub (line, 0) = #"#" then
- loop rules
- else case String.tokens Char.isSpace line of
- uname'::rest =>
- if uname = uname' then
- loop (String.concatWith " " rest :: rules)
- else
- loop rules
- | _ => loop rules
+ val rules = parseRules ()
in
- loop []
- before TextIO.closeIn inf
- end handle IO.Io _ => []
+ List.map (fn (n,r) => r ^ " #host: " ^ n) (getOpt (StringMap.find (#server_rules rules, uname), []) @ getOpt (StringMap.find (#client_rules rules, uname), []))
+ end
+
+
+fun generateFirewallConfig {server_rules, client_rules} =
+ (* rule generation must happen on the node (mandating the even
+ service users be pts users would make it possible to do on the
+ server, but that's not happening any time soon) *)
+ let
+ val users_tcp_out_conf = TextIO.openOut (Config.Firewall.firewallDir ^ "/users_tcp_out.conf")
+ val users_tcp_in_conf = TextIO.openOut (Config.Firewall.firewallDir ^ "/users_tcp_in.conf")
+ val users_conf = TextIO.openOut (Config.Firewall.firewallDir ^ "/user_chains.conf")
+
+ fun filter_node_rules lines =
+ (* filter out rules for other hosts here... really not
+ ideal, but it should work for the time being *)
+ List.map (fn (node, line) => line)
+ (List.filter (fn (node, line) => node = Slave.hostname ()) lines)
+
+ fun write_user_tcp_conf (rules, outf, suffix) =
+ StringMap.appi (fn (uname, rules) =>
+ let
+ val uid = SysWord.toInt (Posix.ProcEnv.uidToWord (Posix.SysDB.Passwd.uid (Posix.SysDB.getpwnam uname)))
+ val lines = filter_node_rules rules
+ in
+ TextIO.output (outf, String.concat
+ ["mod owner uid-owner ",
+ Int.toString uid,
+ " { goto user_",
+ uname,
+ suffix,
+ "; DROP; }\n"]);
+ (* Is there any point to splitting the rules like this? *)
+ TextIO.output (users_conf,
+ String.concat ("chain user_"
+ :: uname
+ :: suffix
+ :: " proto tcp {\n"
+ :: lines
+ @ ["}\n\n"]))
+ end handle OS.SysErr _ => print "Invalid user in firewall config, skipping.\n")
+ rules
+
+ fun write_tcp_in_conf (rules, outf, suffix) =
+ (* Lame hack: can't use iptables to restrict port binding,
+ punting on SELinux &c for now and just opening every
+ port any user requests *)
+
+ let
+ in
+ TextIO.output (outf, String.concat ["@def $WEBNODES = (",
+ (String.concatWith ", " (List.map (fn (_, ip) => ip)
+ (List.filter (fn (node, _) => List.exists (fn (n) => n = node) (List.map (fn (node, _) => node) (Config.Apache.webNodes_all @ Config.Apache.webNodes_admin)))
+ Config.nodeIps))),
+ ");\n\n"]);
+ StringMap.appi (fn (uname, rules) =>
+ let
+ val uid = SysWord.toInt (Posix.ProcEnv.uidToWord (Posix.SysDB.Passwd.uid (Posix.SysDB.getpwnam uname)))
+ val lines = filter_node_rules rules
+ in
+ TextIO.output (outf,
+ String.concat ("proto tcp {\n"
+ :: lines
+ @ ["}\n\n"]))
+ end handle OS.SysErr _ => print "Invalid user in firewall config, skipping.\n")
+ rules
+ end
+ in
+ write_tcp_in_conf (server_rules, users_tcp_in_conf, "_tcp_in");
+ write_user_tcp_conf (client_rules, users_tcp_out_conf, "_tcp_out");
+
+ TextIO.closeOut users_conf;
+ TextIO.closeOut users_tcp_out_conf;
+ TextIO.closeOut users_tcp_in_conf;
+ true
+ end
+fun publishConfig _ =
+ Slave.shell [Config.Firewall.reload]
end
HCoop / hcoop / domtool2.git / blobdiff