diff options
Diffstat (limited to 'src/libcharon/plugins/connmark')
| -rw-r--r-- | src/libcharon/plugins/connmark/Makefile.am | 20 | ||||
| -rw-r--r-- | src/libcharon/plugins/connmark/Makefile.in | 782 | ||||
| -rw-r--r-- | src/libcharon/plugins/connmark/connmark_listener.c | 538 | ||||
| -rw-r--r-- | src/libcharon/plugins/connmark/connmark_listener.h | 49 | ||||
| -rw-r--r-- | src/libcharon/plugins/connmark/connmark_plugin.c | 105 | ||||
| -rw-r--r-- | src/libcharon/plugins/connmark/connmark_plugin.h | 42 |
6 files changed, 1536 insertions, 0 deletions
diff --git a/src/libcharon/plugins/connmark/Makefile.am b/src/libcharon/plugins/connmark/Makefile.am new file mode 100644 index 000000000..cc4d0ec8d --- /dev/null +++ b/src/libcharon/plugins/connmark/Makefile.am @@ -0,0 +1,20 @@ +AM_CPPFLAGS = \ + -I$(top_srcdir)/src/libstrongswan \ + -I$(top_srcdir)/src/libhydra \ + -I$(top_srcdir)/src/libcharon + +AM_CFLAGS = \ + $(PLUGIN_CFLAGS) $(libiptc_CFLAGS) + +if MONOLITHIC +noinst_LTLIBRARIES = libstrongswan-connmark.la +else +plugin_LTLIBRARIES = libstrongswan-connmark.la +endif + +libstrongswan_connmark_la_SOURCES = \ + connmark_listener.h connmark_listener.c \ + connmark_plugin.h connmark_plugin.c + +libstrongswan_connmark_la_LDFLAGS = -module -avoid-version +libstrongswan_connmark_la_LIBADD = $(libiptc_LIBS) diff --git a/src/libcharon/plugins/connmark/Makefile.in b/src/libcharon/plugins/connmark/Makefile.in new file mode 100644 index 000000000..65f53fde9 --- /dev/null +++ b/src/libcharon/plugins/connmark/Makefile.in @@ -0,0 +1,782 @@ +# Makefile.in generated by automake 1.14.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2013 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/src/libcharon/plugins/connmark/connmark_listener.c b/src/libcharon/plugins/connmark/connmark_listener.c new file mode 100644 index 000000000..23df690e8 --- /dev/null +++ b/src/libcharon/plugins/connmark/connmark_listener.c @@ -0,0 +1,538 @@ +/* + * Copyright (C) 2014 Martin Willi + * Copyright (C) 2014 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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 General Public License + * for more details. + */ + +#include "connmark_listener.h" + +#include <daemon.h> + +#include <errno.h> +#include <libiptc/libiptc.h> +#include <linux/netfilter/xt_esp.h> +#include <linux/netfilter/xt_tcpudp.h> +#include <linux/netfilter/xt_MARK.h> +#include <linux/netfilter/xt_policy.h> +#include <linux/netfilter/xt_CONNMARK.h> + + +typedef struct private_connmark_listener_t private_connmark_listener_t; + +/** + * Private data of an connmark_listener_t object. + */ +struct private_connmark_listener_t { + + /** + * Public connmark_listener_t interface. + */ + connmark_listener_t public; +}; + +/** + * Convert an (IPv4) traffic selector to an address and mask + */ +static bool ts2in(traffic_selector_t *ts, + struct in_addr *addr, struct in_addr *mask) +{ + u_int8_t bits; + host_t *net; + + if (ts->get_type(ts) == TS_IPV4_ADDR_RANGE && + ts->to_subnet(ts, &net, &bits)) + { + memcpy(&addr->s_addr, net->get_address(net).ptr, 4); + net->destroy(net); + mask->s_addr = htonl(0xffffffffU << (32 - bits)); + return TRUE; + } + return FALSE; +} + +/** + * Convert an (IPv4) host to an address with mask + */ +static bool host2in(host_t *host, struct in_addr *addr, struct in_addr *mask) +{ + if (host->get_family(host) == AF_INET) + { + memcpy(&addr->s_addr, host->get_address(host).ptr, 4); + mask->s_addr = ~0; + return TRUE; + } + return FALSE; +} + +/** + * Add or remove a rule to/from the specified chain + */ +static bool manage_rule(struct iptc_handle *ipth, const char *chain, + bool add, struct ipt_entry *e) +{ + if (add) + { + if (!iptc_insert_entry(chain, e, 0, ipth)) + { + DBG1(DBG_CFG, "appending %s rule failed: %s", + chain, iptc_strerror(errno)); + return FALSE; + } + } + else + { + if (!iptc_delete_entry(chain, e, "", ipth)) + { + DBG1(DBG_CFG, "deleting %s rule failed: %s", + chain, iptc_strerror(errno)); + return FALSE; + } + } + return TRUE; +} + +/** + * Add rule marking UDP-encapsulated ESP packets to match the correct policy + */ +static bool manage_pre_esp_in_udp(private_connmark_listener_t *this, + struct iptc_handle *ipth, bool add, + u_int mark, u_int32_t spi, + host_t *dst, host_t *src) +{ + struct { + struct ipt_entry e; + struct ipt_entry_match m; + struct xt_udp udp; + struct ipt_entry_target t; + struct xt_mark_tginfo2 tm; + } ipt = { + .e = { + .target_offset = XT_ALIGN(sizeof(ipt.e) + sizeof(ipt.m) + + sizeof(ipt.udp)), + .next_offset = sizeof(ipt), + .ip = { + .proto = IPPROTO_UDP, + }, + }, + .m = { + .u = { + .user = { + .match_size = XT_ALIGN(sizeof(ipt.m) + sizeof(ipt.udp)), + .name = "udp", + }, + }, + }, + .udp = { + .spts = { src->get_port(src), src->get_port(src) }, + .dpts = { dst->get_port(dst), dst->get_port(dst) }, + }, + .t = { + .u = { + .user = { + .target_size = XT_ALIGN(sizeof(ipt.t) + sizeof(ipt.tm)), + .name = "MARK", + .revision = 2, + }, + }, + }, + .tm = { + .mark = mark, + .mask = ~0, + }, + }; + + if (!host2in(dst, &ipt.e.ip.dst, &ipt.e.ip.dmsk) || + !host2in(src, &ipt.e.ip.src, &ipt.e.ip.smsk)) + { + return FALSE; + } + return manage_rule(ipth, "PREROUTING", add, &ipt.e); +} + +/** + * Add rule marking non-encapsulated ESP packets to match the correct policy + */ +static bool manage_pre_esp(private_connmark_listener_t *this, + struct iptc_handle *ipth, bool add, + u_int mark, u_int32_t spi, + host_t *dst, host_t *src) +{ + struct { + struct ipt_entry e; + struct ipt_entry_match m; + struct xt_esp esp; + struct ipt_entry_target t; + struct xt_mark_tginfo2 tm; + } ipt = { + .e = { + .target_offset = XT_ALIGN(sizeof(ipt.e) + sizeof(ipt.m) + + sizeof(ipt.esp)), + .next_offset = sizeof(ipt), + .ip = { + .proto = IPPROTO_ESP, + }, + }, + .m = { + .u = { + .user = { + .match_size = XT_ALIGN(sizeof(ipt.m) + sizeof(ipt.esp)), + .name = "esp", + }, + }, + }, + .esp = { + .spis = { htonl(spi), htonl(spi) }, + }, + .t = { + .u = { + .user = { + .target_size = XT_ALIGN(sizeof(ipt.t) + sizeof(ipt.tm)), + .name = "MARK", + .revision = 2, + }, + }, + }, + .tm = { + .mark = mark, + .mask = ~0, + }, + }; + + if (!host2in(dst, &ipt.e.ip.dst, &ipt.e.ip.dmsk) || + !host2in(src, &ipt.e.ip.src, &ipt.e.ip.smsk)) + { + return FALSE; + } + return manage_rule(ipth, "PREROUTING", add, &ipt.e); +} + +/** + * Add rule marking ESP packets to match the correct policy + */ +static bool manage_pre(private_connmark_listener_t *this, + struct iptc_handle *ipth, bool add, + u_int mark, u_int32_t spi, bool encap, + host_t *dst, host_t *src) +{ + if (encap) + { + return manage_pre_esp_in_udp(this, ipth, add, mark, spi, dst, src); + } + return manage_pre_esp(this, ipth, add, mark, spi, dst, src); +} + +/** + * Add inbound rule applying CONNMARK to matching traffic + */ +static bool manage_in(private_connmark_listener_t *this, + struct iptc_handle *ipth, bool add, + u_int mark, u_int32_t spi, + traffic_selector_t *dst, traffic_selector_t *src) +{ + struct { + struct ipt_entry e; + struct ipt_entry_match m; + struct xt_policy_info p; + struct ipt_entry_target t; + struct xt_connmark_tginfo1 cm; + } ipt = { + .e = { + .target_offset = XT_ALIGN(sizeof(ipt.e) + sizeof(ipt.m) + + sizeof(ipt.p)), + .next_offset = sizeof(ipt), + }, + .m = { + .u = { + .user = { + .match_size = XT_ALIGN(sizeof(ipt.m) + sizeof(ipt.p)), + .name = "policy", + }, + }, + }, + .p = { + .pol = { + { + .spi = spi, + .match.spi = 1, + }, + }, + .len = 1, + .flags = XT_POLICY_MATCH_IN, + }, + .t = { + .u = { + .user = { + .target_size = XT_ALIGN(sizeof(ipt.t) + sizeof(ipt.cm)), + .name = "CONNMARK", + .revision = 1, + }, + }, + }, + .cm = { + .ctmark = mark, + .ctmask = ~0, + .nfmask = ~0, + .mode = XT_CONNMARK_SET, + }, + }; + + if (!ts2in(dst, &ipt.e.ip.dst, &ipt.e.ip.dmsk) || + !ts2in(src, &ipt.e.ip.src, &ipt.e.ip.smsk)) + { + return FALSE; + } + return manage_rule(ipth, "INPUT", add, &ipt.e); +} + +/** + * Add outbund rule restoring CONNMARK on matching traffic + */ +static bool manage_out(private_connmark_listener_t *this, + struct iptc_handle *ipth, bool add, + traffic_selector_t *dst, traffic_selector_t *src) +{ + struct { + struct ipt_entry e; + struct ipt_entry_target t; + struct xt_connmark_tginfo1 cm; + } ipt = { + .e = { + .target_offset = XT_ALIGN(sizeof(ipt.e)), + .next_offset = sizeof(ipt), + }, + .t = { + .u = { + .user = { + .target_size = XT_ALIGN(sizeof(ipt.t) + sizeof(ipt.cm)), + .name = "CONNMARK", + .revision = 1, + }, + }, + }, + .cm = { + .ctmask = ~0, + .nfmask = ~0, + .mode = XT_CONNMARK_RESTORE, + }, + }; + + if (!ts2in(dst, &ipt.e.ip.dst, &ipt.e.ip.dmsk) || + !ts2in(src, &ipt.e.ip.src, &ipt.e.ip.smsk)) + { + return FALSE; + } + return manage_rule(ipth, "OUTPUT", add, &ipt.e); +} + +/** + * Initialize iptables handle, log error + */ +static struct iptc_handle* init_handle() +{ + struct iptc_handle *ipth; + + ipth = iptc_init("mangle"); + if (ipth) + { + return ipth; + } + DBG1(DBG_CFG, "initializing iptables failed: %s", iptc_strerror(errno)); + return NULL; +} + +/** + * Commit iptables rules, log error + */ +static bool commit_handle(struct iptc_handle *ipth) +{ + if (iptc_commit(ipth)) + { + return TRUE; + } + DBG1(DBG_CFG, "forecast iptables commit failed: %s", iptc_strerror(errno)); + return FALSE; +} + +/** + * Add/Remove policies for a CHILD_SA using a iptables handle + */ +static bool manage_policies(private_connmark_listener_t *this, + struct iptc_handle *ipth, host_t *dst, host_t *src, + bool encap, child_sa_t *child_sa, bool add) +{ + traffic_selector_t *local, *remote; + enumerator_t *enumerator; + u_int32_t spi; + u_int mark; + bool done = TRUE; + + spi = child_sa->get_spi(child_sa, TRUE); + mark = child_sa->get_mark(child_sa, TRUE).value; + + enumerator = child_sa->create_policy_enumerator(child_sa); + while (enumerator->enumerate(enumerator, &local, &remote)) + { + if (!manage_pre(this, ipth, add, mark, spi, encap, dst, src) || + !manage_in(this, ipth, add, mark, spi, local, remote) || + !manage_out(this, ipth, add, remote, local)) + { + done = FALSE; + break; + } + } + enumerator->destroy(enumerator); + + return done; +} + +/** + * Check if rules should be installed for given CHILD_SA + */ +static bool handle_sa(child_sa_t *child_sa) +{ + return child_sa->get_mark(child_sa, TRUE).value && + child_sa->get_mark(child_sa, FALSE).value && + child_sa->get_mode(child_sa) == MODE_TRANSPORT && + child_sa->get_protocol(child_sa) == PROTO_ESP; +} + +METHOD(listener_t, child_updown, bool, + private_connmark_listener_t *this, ike_sa_t *ike_sa, child_sa_t *child_sa, + bool up) +{ + struct iptc_handle *ipth; + host_t *dst, *src; + bool encap; + + dst = ike_sa->get_my_host(ike_sa); + src = ike_sa->get_other_host(ike_sa); + encap = child_sa->has_encap(child_sa); + + if (handle_sa(child_sa)) + { + ipth = init_handle(); + if (ipth) + { + if (manage_policies(this, ipth, dst, src, encap, child_sa, up)) + { + commit_handle(ipth); + } + iptc_free(ipth); + } + } + return TRUE; +} + +METHOD(listener_t, child_rekey, bool, + private_connmark_listener_t *this, ike_sa_t *ike_sa, + child_sa_t *old, child_sa_t *new) +{ + struct iptc_handle *ipth; + host_t *dst, *src; + bool oldencap, newencap; + + dst = ike_sa->get_my_host(ike_sa); + src = ike_sa->get_other_host(ike_sa); + oldencap = old->has_encap(old); + newencap = new->has_encap(new); + + if (handle_sa(old)) + { + ipth = init_handle(); + if (ipth) + { + if (manage_policies(this, ipth, dst, src, oldencap, old, FALSE) && + manage_policies(this, ipth, dst, src, newencap, new, TRUE)) + { + commit_handle(ipth); + } + iptc_free(ipth); + } + } + return TRUE; +} + +METHOD(listener_t, ike_update, bool, + private_connmark_listener_t *this, ike_sa_t *ike_sa, + bool local, host_t *new) +{ + struct iptc_handle *ipth; + enumerator_t *enumerator; + child_sa_t *child_sa; + host_t *dst, *src; + bool oldencap, newencap; + + if (local) + { + dst = new; + src = ike_sa->get_other_host(ike_sa); + } + else + { + dst = ike_sa->get_my_host(ike_sa); + src = new; + } + /* during ike_update(), has_encap() on the CHILD_SA has not yet been + * updated, but shows the old state. */ + newencap = ike_sa->has_condition(ike_sa, COND_NAT_ANY); + + enumerator = ike_sa->create_child_sa_enumerator(ike_sa); + while (enumerator->enumerate(enumerator, &child_sa)) + { + if (handle_sa(child_sa)) + { + oldencap = child_sa->has_encap(child_sa); + ipth = init_handle(); + if (ipth) + { + if (manage_policies(this, ipth, dst, src, oldencap, + child_sa, FALSE) && + manage_policies(this, ipth, dst, src, newencap, + child_sa, TRUE)) + { + commit_handle(ipth); + } + iptc_free(ipth); + } + } + } + enumerator->destroy(enumerator); + + return TRUE; +} + +METHOD(connmark_listener_t, destroy, void, + private_connmark_listener_t *this) +{ + free(this); +} + +/** + * See header + */ +connmark_listener_t *connmark_listener_create() +{ + private_connmark_listener_t *this; + + INIT(this, + .public = { + .listener = { + .ike_update = _ike_update, + .child_updown = _child_updown, + .child_rekey = _child_rekey, + }, + .destroy = _destroy, + }, + ); + + return &this->public; +} diff --git a/src/libcharon/plugins/connmark/connmark_listener.h b/src/libcharon/plugins/connmark/connmark_listener.h new file mode 100644 index 000000000..2d4098fb6 --- /dev/null +++ b/src/libcharon/plugins/connmark/connmark_listener.h @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2014 Martin Willi + * Copyright (C) 2014 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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 General Public License + * for more details. + */ + +/** + * @defgroup connmark_listener connmark_listener + * @{ @ingroup connmark + */ + +#ifndef CONNMARK_LISTENER_H_ +#define CONNMARK_LISTENER_H_ + +#include <bus/listeners/listener.h> + +typedef struct connmark_listener_t connmark_listener_t; + +/** + * Listener to install Netfilter rules + */ +struct connmark_listener_t { + + /** + * Implements listener_t interface. + */ + listener_t listener; + + /** + * Destroy a connmark_listener_t. + */ + void (*destroy)(connmark_listener_t *this); +}; + +/** + * Create a connmark_listener instance. + */ +connmark_listener_t *connmark_listener_create(); + +#endif /** CONNMARK_LISTENER_H_ @}*/ diff --git a/src/libcharon/plugins/connmark/connmark_plugin.c b/src/libcharon/plugins/connmark/connmark_plugin.c new file mode 100644 index 000000000..3f276f93e --- /dev/null +++ b/src/libcharon/plugins/connmark/connmark_plugin.c @@ -0,0 +1,105 @@ +/* + * Copyright (C) 2014 Martin Willi + * Copyright (C) 2014 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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 General Public License + * for more details. + */ + +#include "connmark_plugin.h" +#include "connmark_listener.h" + +#include <daemon.h> + +typedef struct private_connmark_plugin_t private_connmark_plugin_t; + +/** + * private data of connmark plugin + */ +struct private_connmark_plugin_t { + + /** + * implements plugin interface + */ + connmark_plugin_t public; + + /** + * Listener installing netfilter rules + */ + connmark_listener_t *listener; +}; + +METHOD(plugin_t, get_name, char*, + private_connmark_plugin_t *this) +{ + return "connmark"; +} + +/** + * Register listener + */ +static bool plugin_cb(private_connmark_plugin_t *this, + plugin_feature_t *feature, bool reg, void *cb_data) +{ + if (reg) + { + charon->bus->add_listener(charon->bus, &this->listener->listener); + } + else + { + charon->bus->remove_listener(charon->bus, &this->listener->listener); + } + return TRUE; +} + +METHOD(plugin_t, get_features, int, + private_connmark_plugin_t *this, plugin_feature_t *features[]) +{ + static plugin_feature_t f[] = { + PLUGIN_CALLBACK((plugin_feature_callback_t)plugin_cb, NULL), + PLUGIN_PROVIDE(CUSTOM, "connmark"), + }; + *features = f; + return countof(f); +} + +METHOD(plugin_t, destroy, void, + private_connmark_plugin_t *this) +{ + this->listener->destroy(this->listener); + free(this); +} + +/** + * Plugin constructor + */ +plugin_t *connmark_plugin_create() +{ + private_connmark_plugin_t *this; + + if (!lib->caps->keep(lib->caps, CAP_NET_ADMIN)) + { + DBG1(DBG_NET, "connmark plugin requires CAP_NET_ADMIN capability"); + return NULL; + } + + INIT(this, + .public = { + .plugin = { + .get_name = _get_name, + .get_features = _get_features, + .destroy = _destroy, + }, + }, + .listener = connmark_listener_create(), + ); + + return &this->public.plugin; +} diff --git a/src/libcharon/plugins/connmark/connmark_plugin.h b/src/libcharon/plugins/connmark/connmark_plugin.h new file mode 100644 index 000000000..5b4ccebbe --- /dev/null +++ b/src/libcharon/plugins/connmark/connmark_plugin.h @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2014 Martin Willi + * Copyright (C) 2014 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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 General Public License + * for more details. + */ + +/** + * @defgroup connmark connmark + * @ingroup cplugins + * + * @defgroup connmark_plugin connmark_plugin + * @{ @ingroup connmark + */ + +#ifndef CONNMARK_PLUGIN_H_ +#define CONNMARK_PLUGIN_H_ + +#include <plugins/plugin.h> + +typedef struct connmark_plugin_t connmark_plugin_t; + +/** + * Plugin using marks to select return path SA based on conntrack. + */ +struct connmark_plugin_t { + + /** + * implements plugin interface + */ + plugin_t plugin; +}; + +#endif /** CONNMARK_PLUGIN_H_ @}*/ |