X-Git-Url: https://git.hcoop.net/hcoop/domtool2.git/blobdiff_plain/f9548f1652232653178ffd9839b9cbbf7f87316b..7ceba9683f4372dfc348e0774a550a573fdcfefa:/src/plugins/firewall.sml diff --git a/src/plugins/firewall.sml b/src/plugins/firewall.sml index 6a4bb30..9fd64f9 100644 --- a/src/plugins/firewall.sml +++ b/src/plugins/firewall.sml @@ -1,5 +1,6 @@ (* 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 @@ -16,31 +17,156 @@ * 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;"]); + (* Warning: duplicates code of Client case *) + List.map (fn (node, _) => confLine_out (node, uname, String.concat ["dport ", parsePorts ports, Domain.nodeIp node, " ACCEPT;"] )) + Config.Apache.webNodes_all; ()) + | ["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, + " { jump 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