diff options
Diffstat (limited to 'src/charon/plugins/kernel_netlink/kernel_netlink_ipsec.c')
| -rw-r--r-- | src/charon/plugins/kernel_netlink/kernel_netlink_ipsec.c | 2069 |
1 files changed, 0 insertions, 2069 deletions
diff --git a/src/charon/plugins/kernel_netlink/kernel_netlink_ipsec.c b/src/charon/plugins/kernel_netlink/kernel_netlink_ipsec.c deleted file mode 100644 index 850876b9d..000000000 --- a/src/charon/plugins/kernel_netlink/kernel_netlink_ipsec.c +++ /dev/null @@ -1,2069 +0,0 @@ -/* - * Copyright (C) 2006-2009 Tobias Brunner - * Copyright (C) 2005-2009 Martin Willi - * Copyright (C) 2008 Andreas Steffen - * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser - * Copyright (C) 2006 Daniel Roethlisberger - * Copyright (C) 2005 Jan Hutter - * Hochschule fuer Technik Rapperswil - * - * 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 <sys/types.h> -#include <sys/socket.h> -#include <stdint.h> -#include <linux/ipsec.h> -#include <linux/netlink.h> -#include <linux/rtnetlink.h> -#include <linux/xfrm.h> -#include <linux/udp.h> -#include <unistd.h> -#include <time.h> -#include <errno.h> -#include <string.h> -#include <fcntl.h> - -#include "kernel_netlink_ipsec.h" -#include "kernel_netlink_shared.h" - -#include <daemon.h> -#include <threading/thread.h> -#include <threading/mutex.h> -#include <utils/hashtable.h> -#include <processing/jobs/callback_job.h> -#include <processing/jobs/acquire_job.h> -#include <processing/jobs/migrate_job.h> -#include <processing/jobs/rekey_child_sa_job.h> -#include <processing/jobs/delete_child_sa_job.h> -#include <processing/jobs/update_sa_job.h> - -/** required for Linux 2.6.26 kernel and later */ -#ifndef XFRM_STATE_AF_UNSPEC -#define XFRM_STATE_AF_UNSPEC 32 -#endif - -/** from linux/in.h */ -#ifndef IP_XFRM_POLICY -#define IP_XFRM_POLICY 17 -#endif - -/* missing on uclibc */ -#ifndef IPV6_XFRM_POLICY -#define IPV6_XFRM_POLICY 34 -#endif /*IPV6_XFRM_POLICY*/ - -/** default priority of installed policies */ -#define PRIO_LOW 3000 -#define PRIO_HIGH 2000 - -/** - * map the limit for bytes and packets to XFRM_INF per default - */ -#define XFRM_LIMIT(x) ((x) == 0 ? XFRM_INF : (x)) - -/** - * Create ORable bitfield of XFRM NL groups - */ -#define XFRMNLGRP(x) (1<<(XFRMNLGRP_##x-1)) - -/** - * returns a pointer to the first rtattr following the nlmsghdr *nlh and the - * 'usual' netlink data x like 'struct xfrm_usersa_info' - */ -#define XFRM_RTA(nlh, x) ((struct rtattr*)(NLMSG_DATA(nlh) + NLMSG_ALIGN(sizeof(x)))) -/** - * returns a pointer to the next rtattr following rta. - * !!! do not use this to parse messages. use RTA_NEXT and RTA_OK instead !!! - */ -#define XFRM_RTA_NEXT(rta) ((struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len))) -/** - * returns the total size of attached rta data - * (after 'usual' netlink data x like 'struct xfrm_usersa_info') - */ -#define XFRM_PAYLOAD(nlh, x) NLMSG_PAYLOAD(nlh, sizeof(x)) - -typedef struct kernel_algorithm_t kernel_algorithm_t; - -/** - * Mapping of IKEv2 kernel identifier to linux crypto API names - */ -struct kernel_algorithm_t { - /** - * Identifier specified in IKEv2 - */ - int ikev2; - - /** - * Name of the algorithm in linux crypto API - */ - char *name; -}; - -ENUM(xfrm_msg_names, XFRM_MSG_NEWSA, XFRM_MSG_MAPPING, - "XFRM_MSG_NEWSA", - "XFRM_MSG_DELSA", - "XFRM_MSG_GETSA", - "XFRM_MSG_NEWPOLICY", - "XFRM_MSG_DELPOLICY", - "XFRM_MSG_GETPOLICY", - "XFRM_MSG_ALLOCSPI", - "XFRM_MSG_ACQUIRE", - "XFRM_MSG_EXPIRE", - "XFRM_MSG_UPDPOLICY", - "XFRM_MSG_UPDSA", - "XFRM_MSG_POLEXPIRE", - "XFRM_MSG_FLUSHSA", - "XFRM_MSG_FLUSHPOLICY", - "XFRM_MSG_NEWAE", - "XFRM_MSG_GETAE", - "XFRM_MSG_REPORT", - "XFRM_MSG_MIGRATE", - "XFRM_MSG_NEWSADINFO", - "XFRM_MSG_GETSADINFO", - "XFRM_MSG_NEWSPDINFO", - "XFRM_MSG_GETSPDINFO", - "XFRM_MSG_MAPPING" -); - -ENUM(xfrm_attr_type_names, XFRMA_UNSPEC, XFRMA_KMADDRESS, - "XFRMA_UNSPEC", - "XFRMA_ALG_AUTH", - "XFRMA_ALG_CRYPT", - "XFRMA_ALG_COMP", - "XFRMA_ENCAP", - "XFRMA_TMPL", - "XFRMA_SA", - "XFRMA_POLICY", - "XFRMA_SEC_CTX", - "XFRMA_LTIME_VAL", - "XFRMA_REPLAY_VAL", - "XFRMA_REPLAY_THRESH", - "XFRMA_ETIMER_THRESH", - "XFRMA_SRCADDR", - "XFRMA_COADDR", - "XFRMA_LASTUSED", - "XFRMA_POLICY_TYPE", - "XFRMA_MIGRATE", - "XFRMA_ALG_AEAD", - "XFRMA_KMADDRESS" -); - -#define END_OF_LIST -1 - -/** - * Algorithms for encryption - */ -static kernel_algorithm_t encryption_algs[] = { -/* {ENCR_DES_IV64, "***" }, */ - {ENCR_DES, "des" }, - {ENCR_3DES, "des3_ede" }, -/* {ENCR_RC5, "***" }, */ -/* {ENCR_IDEA, "***" }, */ - {ENCR_CAST, "cast128" }, - {ENCR_BLOWFISH, "blowfish" }, -/* {ENCR_3IDEA, "***" }, */ -/* {ENCR_DES_IV32, "***" }, */ - {ENCR_NULL, "cipher_null" }, - {ENCR_AES_CBC, "aes" }, - {ENCR_AES_CTR, "rfc3686(ctr(aes))" }, - {ENCR_AES_CCM_ICV8, "rfc4309(ccm(aes))" }, - {ENCR_AES_CCM_ICV12, "rfc4309(ccm(aes))" }, - {ENCR_AES_CCM_ICV16, "rfc4309(ccm(aes))" }, - {ENCR_AES_GCM_ICV8, "rfc4106(gcm(aes))" }, - {ENCR_AES_GCM_ICV12, "rfc4106(gcm(aes))" }, - {ENCR_AES_GCM_ICV16, "rfc4106(gcm(aes))" }, -/* {ENCR_NULL_AUTH_AES_GMAC, "***" }, */ - {ENCR_CAMELLIA_CBC, "cbc(camellia)" }, -/* {ENCR_CAMELLIA_CTR, "***" }, */ -/* {ENCR_CAMELLIA_CCM_ICV8, "***" }, */ -/* {ENCR_CAMELLIA_CCM_ICV12, "***" }, */ -/* {ENCR_CAMELLIA_CCM_ICV16, "***" }, */ - {END_OF_LIST, NULL } -}; - -/** - * Algorithms for integrity protection - */ -static kernel_algorithm_t integrity_algs[] = { - {AUTH_HMAC_MD5_96, "md5" }, - {AUTH_HMAC_SHA1_96, "sha1" }, - {AUTH_HMAC_SHA2_256_96, "sha256" }, - {AUTH_HMAC_SHA2_256_128, "hmac(sha256)" }, - {AUTH_HMAC_SHA2_384_192, "hmac(sha384)" }, - {AUTH_HMAC_SHA2_512_256, "hmac(sha512)" }, -/* {AUTH_DES_MAC, "***" }, */ -/* {AUTH_KPDK_MD5, "***" }, */ - {AUTH_AES_XCBC_96, "xcbc(aes)" }, - {END_OF_LIST, NULL } -}; - -/** - * Algorithms for IPComp - */ -static kernel_algorithm_t compression_algs[] = { -/* {IPCOMP_OUI, "***" }, */ - {IPCOMP_DEFLATE, "deflate" }, - {IPCOMP_LZS, "lzs" }, - {IPCOMP_LZJH, "lzjh" }, - {END_OF_LIST, NULL } -}; - -/** - * Look up a kernel algorithm name and its key size - */ -static char* lookup_algorithm(kernel_algorithm_t *list, int ikev2) -{ - while (list->ikev2 != END_OF_LIST) - { - if (list->ikev2 == ikev2) - { - return list->name; - } - list++; - } - return NULL; -} - -typedef struct route_entry_t route_entry_t; - -/** - * installed routing entry - */ -struct route_entry_t { - /** Name of the interface the route is bound to */ - char *if_name; - - /** Source ip of the route */ - host_t *src_ip; - - /** gateway for this route */ - host_t *gateway; - - /** Destination net */ - chunk_t dst_net; - - /** Destination net prefixlen */ - u_int8_t prefixlen; -}; - -/** - * destroy an route_entry_t object - */ -static void route_entry_destroy(route_entry_t *this) -{ - free(this->if_name); - this->src_ip->destroy(this->src_ip); - DESTROY_IF(this->gateway); - chunk_free(&this->dst_net); - free(this); -} - -typedef struct policy_entry_t policy_entry_t; - -/** - * installed kernel policy. - */ -struct policy_entry_t { - - /** direction of this policy: in, out, forward */ - u_int8_t direction; - - /** parameters of installed policy */ - struct xfrm_selector sel; - - /** associated route installed for this policy */ - route_entry_t *route; - - /** by how many CHILD_SA's this policy is used */ - u_int refcount; -}; - -/** - * Hash function for policy_entry_t objects - */ -static u_int policy_hash(policy_entry_t *key) -{ - chunk_t chunk = chunk_create((void*)&key->sel, sizeof(struct xfrm_selector)); - return chunk_hash(chunk); -} - -/** - * Equality function for policy_entry_t objects - */ -static bool policy_equals(policy_entry_t *key, policy_entry_t *other_key) -{ - return memeq(&key->sel, &other_key->sel, sizeof(struct xfrm_selector)) && - key->direction == other_key->direction; -} - -typedef struct private_kernel_netlink_ipsec_t private_kernel_netlink_ipsec_t; - -/** - * Private variables and functions of kernel_netlink class. - */ -struct private_kernel_netlink_ipsec_t { - /** - * Public part of the kernel_netlink_t object. - */ - kernel_netlink_ipsec_t public; - - /** - * mutex to lock access to various lists - */ - mutex_t *mutex; - - /** - * Hash table of installed policies (policy_entry_t) - */ - hashtable_t *policies; - - /** - * job receiving netlink events - */ - callback_job_t *job; - - /** - * Netlink xfrm socket (IPsec) - */ - netlink_socket_t *socket_xfrm; - - /** - * netlink xfrm socket to receive acquire and expire events - */ - int socket_xfrm_events; - - /** - * whether to install routes along policies - */ - bool install_routes; -}; - -/** - * convert a IKEv2 specific protocol identifier to the kernel one - */ -static u_int8_t proto_ike2kernel(protocol_id_t proto) -{ - switch (proto) - { - case PROTO_ESP: - return IPPROTO_ESP; - case PROTO_AH: - return IPPROTO_AH; - default: - return proto; - } -} - -/** - * reverse of ike2kernel - */ -static protocol_id_t proto_kernel2ike(u_int8_t proto) -{ - switch (proto) - { - case IPPROTO_ESP: - return PROTO_ESP; - case IPPROTO_AH: - return PROTO_AH; - default: - return proto; - } -} - -/** - * convert the general ipsec mode to the one defined in xfrm.h - */ -static u_int8_t mode2kernel(ipsec_mode_t mode) -{ - switch (mode) - { - case MODE_TRANSPORT: - return XFRM_MODE_TRANSPORT; - case MODE_TUNNEL: - return XFRM_MODE_TUNNEL; - case MODE_BEET: - return XFRM_MODE_BEET; - default: - return mode; - } -} - -/** - * convert a host_t to a struct xfrm_address - */ -static void host2xfrm(host_t *host, xfrm_address_t *xfrm) -{ - chunk_t chunk = host->get_address(host); - memcpy(xfrm, chunk.ptr, min(chunk.len, sizeof(xfrm_address_t))); -} - -/** - * convert a struct xfrm_address to a host_t - */ -static host_t* xfrm2host(int family, xfrm_address_t *xfrm, u_int16_t port) -{ - chunk_t chunk; - - switch (family) - { - case AF_INET: - chunk = chunk_create((u_char*)&xfrm->a4, sizeof(xfrm->a4)); - break; - case AF_INET6: - chunk = chunk_create((u_char*)&xfrm->a6, sizeof(xfrm->a6)); - break; - default: - return NULL; - } - return host_create_from_chunk(family, chunk, ntohs(port)); -} - -/** - * convert a traffic selector address range to subnet and its mask. - */ -static void ts2subnet(traffic_selector_t* ts, - xfrm_address_t *net, u_int8_t *mask) -{ - host_t *net_host; - chunk_t net_chunk; - - ts->to_subnet(ts, &net_host, mask); - net_chunk = net_host->get_address(net_host); - memcpy(net, net_chunk.ptr, net_chunk.len); - net_host->destroy(net_host); -} - -/** - * convert a traffic selector port range to port/portmask - */ -static void ts2ports(traffic_selector_t* ts, - u_int16_t *port, u_int16_t *mask) -{ - /* linux does not seem to accept complex portmasks. Only - * any or a specific port is allowed. We set to any, if we have - * a port range, or to a specific, if we have one port only. - */ - u_int16_t from, to; - - from = ts->get_from_port(ts); - to = ts->get_to_port(ts); - - if (from == to) - { - *port = htons(from); - *mask = ~0; - } - else - { - *port = 0; - *mask = 0; - } -} - -/** - * convert a pair of traffic_selectors to a xfrm_selector - */ -static struct xfrm_selector ts2selector(traffic_selector_t *src, - traffic_selector_t *dst) -{ - struct xfrm_selector sel; - - memset(&sel, 0, sizeof(sel)); - sel.family = (src->get_type(src) == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6; - /* src or dest proto may be "any" (0), use more restrictive one */ - sel.proto = max(src->get_protocol(src), dst->get_protocol(dst)); - ts2subnet(dst, &sel.daddr, &sel.prefixlen_d); - ts2subnet(src, &sel.saddr, &sel.prefixlen_s); - ts2ports(dst, &sel.dport, &sel.dport_mask); - ts2ports(src, &sel.sport, &sel.sport_mask); - sel.ifindex = 0; - sel.user = 0; - - return sel; -} - -/** - * convert a xfrm_selector to a src|dst traffic_selector - */ -static traffic_selector_t* selector2ts(struct xfrm_selector *sel, bool src) -{ - u_char *addr; - u_int8_t prefixlen; - u_int16_t port = 0; - host_t *host = NULL; - - if (src) - { - addr = (u_char*)&sel->saddr; - prefixlen = sel->prefixlen_s; - if (sel->sport_mask) - { - port = htons(sel->sport); - } - } - else - { - addr = (u_char*)&sel->daddr; - prefixlen = sel->prefixlen_d; - if (sel->dport_mask) - { - port = htons(sel->dport); - } - } - - /* The Linux 2.6 kernel does not set the selector's family field, - * so as a kludge we additionally test the prefix length. - */ - if (sel->family == AF_INET || sel->prefixlen_s == 32) - { - host = host_create_from_chunk(AF_INET, chunk_create(addr, 4), 0); - } - else if (sel->family == AF_INET6 || sel->prefixlen_s == 128) - { - host = host_create_from_chunk(AF_INET6, chunk_create(addr, 16), 0); - } - - if (host) - { - return traffic_selector_create_from_subnet(host, prefixlen, - sel->proto, port); - } - return NULL; -} - -/** - * process a XFRM_MSG_ACQUIRE from kernel - */ -static void process_acquire(private_kernel_netlink_ipsec_t *this, struct nlmsghdr *hdr) -{ - u_int32_t reqid = 0; - int proto = 0; - traffic_selector_t *src_ts, *dst_ts; - struct xfrm_user_acquire *acquire; - struct rtattr *rta; - size_t rtasize; - job_t *job; - - acquire = (struct xfrm_user_acquire*)NLMSG_DATA(hdr); - rta = XFRM_RTA(hdr, struct xfrm_user_acquire); - rtasize = XFRM_PAYLOAD(hdr, struct xfrm_user_acquire); - - DBG2(DBG_KNL, "received a XFRM_MSG_ACQUIRE"); - - while (RTA_OK(rta, rtasize)) - { - DBG2(DBG_KNL, " %N", xfrm_attr_type_names, rta->rta_type); - - if (rta->rta_type == XFRMA_TMPL) - { - struct xfrm_user_tmpl* tmpl; - - tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rta); - reqid = tmpl->reqid; - proto = tmpl->id.proto; - } - rta = RTA_NEXT(rta, rtasize); - } - switch (proto) - { - case 0: - case IPPROTO_ESP: - case IPPROTO_AH: - break; - default: - /* acquire for AH/ESP only, not for IPCOMP */ - return; - } - src_ts = selector2ts(&acquire->sel, TRUE); - dst_ts = selector2ts(&acquire->sel, FALSE); - DBG1(DBG_KNL, "creating acquire job for policy %R === %R with reqid {%u}", - src_ts, dst_ts, reqid); - job = (job_t*)acquire_job_create(reqid, src_ts, dst_ts); - charon->processor->queue_job(charon->processor, job); -} - -/** - * process a XFRM_MSG_EXPIRE from kernel - */ -static void process_expire(private_kernel_netlink_ipsec_t *this, struct nlmsghdr *hdr) -{ - job_t *job; - protocol_id_t protocol; - u_int32_t spi, reqid; - struct xfrm_user_expire *expire; - - expire = (struct xfrm_user_expire*)NLMSG_DATA(hdr); - protocol = proto_kernel2ike(expire->state.id.proto); - spi = expire->state.id.spi; - reqid = expire->state.reqid; - - DBG2(DBG_KNL, "received a XFRM_MSG_EXPIRE"); - - if (protocol != PROTO_ESP && protocol != PROTO_AH) - { - DBG2(DBG_KNL, "ignoring XFRM_MSG_EXPIRE for SA with SPI %.8x and reqid {%u} " - "which is not a CHILD_SA", ntohl(spi), reqid); - return; - } - - DBG1(DBG_KNL, "creating %s job for %N CHILD_SA with SPI %.8x and reqid {%d}", - expire->hard ? "delete" : "rekey", protocol_id_names, - protocol, ntohl(spi), reqid); - if (expire->hard) - { - job = (job_t*)delete_child_sa_job_create(reqid, protocol, spi); - } - else - { - job = (job_t*)rekey_child_sa_job_create(reqid, protocol, spi); - } - charon->processor->queue_job(charon->processor, job); -} - -/** - * process a XFRM_MSG_MIGRATE from kernel - */ -static void process_migrate(private_kernel_netlink_ipsec_t *this, struct nlmsghdr *hdr) -{ - traffic_selector_t *src_ts, *dst_ts; - host_t *local = NULL, *remote = NULL; - host_t *old_src = NULL, *old_dst = NULL; - host_t *new_src = NULL, *new_dst = NULL; - struct xfrm_userpolicy_id *policy_id; - struct rtattr *rta; - size_t rtasize; - u_int32_t reqid = 0; - policy_dir_t dir; - job_t *job; - - policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr); - rta = XFRM_RTA(hdr, struct xfrm_userpolicy_id); - rtasize = XFRM_PAYLOAD(hdr, struct xfrm_userpolicy_id); - - DBG2(DBG_KNL, "received a XFRM_MSG_MIGRATE"); - - src_ts = selector2ts(&policy_id->sel, TRUE); - dst_ts = selector2ts(&policy_id->sel, FALSE); - dir = (policy_dir_t)policy_id->dir; - - DBG2(DBG_KNL, " policy: %R === %R %N", src_ts, dst_ts, policy_dir_names); - - while (RTA_OK(rta, rtasize)) - { - DBG2(DBG_KNL, " %N", xfrm_attr_type_names, rta->rta_type); - if (rta->rta_type == XFRMA_KMADDRESS) - { - struct xfrm_user_kmaddress *kmaddress; - - kmaddress = (struct xfrm_user_kmaddress*)RTA_DATA(rta); - local = xfrm2host(kmaddress->family, &kmaddress->local, 0); - remote = xfrm2host(kmaddress->family, &kmaddress->remote, 0); - DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote); - } - else if (rta->rta_type == XFRMA_MIGRATE) - { - struct xfrm_user_migrate *migrate; - protocol_id_t proto; - - migrate = (struct xfrm_user_migrate*)RTA_DATA(rta); - old_src = xfrm2host(migrate->old_family, &migrate->old_saddr, 0); - old_dst = xfrm2host(migrate->old_family, &migrate->old_daddr, 0); - new_src = xfrm2host(migrate->new_family, &migrate->new_saddr, 0); - new_dst = xfrm2host(migrate->new_family, &migrate->new_daddr, 0); - proto = proto_kernel2ike(migrate->proto); - reqid = migrate->reqid; - DBG2(DBG_KNL, " migrate %N %H...%H to %H...%H, reqid {%u}", - protocol_id_names, proto, old_src, old_dst, - new_src, new_dst, reqid); - DESTROY_IF(old_src); - DESTROY_IF(old_dst); - DESTROY_IF(new_src); - DESTROY_IF(new_dst); - } - rta = RTA_NEXT(rta, rtasize); - } - - if (src_ts && dst_ts && local && remote) - { - DBG1(DBG_KNL, "creating migrate job for policy %R === %R %N with reqid {%u}", - src_ts, dst_ts, policy_dir_names, dir, reqid, local); - job = (job_t*)migrate_job_create(reqid, src_ts, dst_ts, dir, - local, remote); - charon->processor->queue_job(charon->processor, job); - } - else - { - DESTROY_IF(src_ts); - DESTROY_IF(dst_ts); - DESTROY_IF(local); - DESTROY_IF(remote); - } -} - -/** - * process a XFRM_MSG_MAPPING from kernel - */ -static void process_mapping(private_kernel_netlink_ipsec_t *this, - struct nlmsghdr *hdr) -{ - job_t *job; - u_int32_t spi, reqid; - struct xfrm_user_mapping *mapping; - host_t *host; - - mapping = (struct xfrm_user_mapping*)NLMSG_DATA(hdr); - spi = mapping->id.spi; - reqid = mapping->reqid; - - DBG2(DBG_KNL, "received a XFRM_MSG_MAPPING"); - - if (proto_kernel2ike(mapping->id.proto) == PROTO_ESP) - { - host = xfrm2host(mapping->id.family, &mapping->new_saddr, - mapping->new_sport); - if (host) - { - DBG1(DBG_KNL, "NAT mappings of ESP CHILD_SA with SPI %.8x and " - "reqid {%u} changed, queuing update job", ntohl(spi), reqid); - job = (job_t*)update_sa_job_create(reqid, host); - charon->processor->queue_job(charon->processor, job); - } - } -} - -/** - * Receives events from kernel - */ -static job_requeue_t receive_events(private_kernel_netlink_ipsec_t *this) -{ - char response[1024]; - struct nlmsghdr *hdr = (struct nlmsghdr*)response; - struct sockaddr_nl addr; - socklen_t addr_len = sizeof(addr); - int len; - bool oldstate; - - oldstate = thread_cancelability(TRUE); - len = recvfrom(this->socket_xfrm_events, response, sizeof(response), 0, - (struct sockaddr*)&addr, &addr_len); - thread_cancelability(oldstate); - - if (len < 0) - { - switch (errno) - { - case EINTR: - /* interrupted, try again */ - return JOB_REQUEUE_DIRECT; - case EAGAIN: - /* no data ready, select again */ - return JOB_REQUEUE_DIRECT; - default: - DBG1(DBG_KNL, "unable to receive from xfrm event socket"); - sleep(1); - return JOB_REQUEUE_FAIR; - } - } - - if (addr.nl_pid != 0) - { /* not from kernel. not interested, try another one */ - return JOB_REQUEUE_DIRECT; - } - - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_ACQUIRE: - process_acquire(this, hdr); - break; - case XFRM_MSG_EXPIRE: - process_expire(this, hdr); - break; - case XFRM_MSG_MIGRATE: - process_migrate(this, hdr); - break; - case XFRM_MSG_MAPPING: - process_mapping(this, hdr); - break; - default: - DBG1(DBG_KNL, "received unknown event from xfrm event socket: %d", hdr->nlmsg_type); - break; - } - hdr = NLMSG_NEXT(hdr, len); - } - return JOB_REQUEUE_DIRECT; -} - -/** - * Get an SPI for a specific protocol from the kernel. - */ -static status_t get_spi_internal(private_kernel_netlink_ipsec_t *this, - host_t *src, host_t *dst, u_int8_t proto, u_int32_t min, u_int32_t max, - u_int32_t reqid, u_int32_t *spi) -{ - netlink_buf_t request; - struct nlmsghdr *hdr, *out; - struct xfrm_userspi_info *userspi; - u_int32_t received_spi = 0; - size_t len; - - memset(&request, 0, sizeof(request)); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - hdr->nlmsg_type = XFRM_MSG_ALLOCSPI; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userspi_info)); - - userspi = (struct xfrm_userspi_info*)NLMSG_DATA(hdr); - host2xfrm(src, &userspi->info.saddr); - host2xfrm(dst, &userspi->info.id.daddr); - userspi->info.id.proto = proto; - userspi->info.mode = XFRM_MODE_TUNNEL; - userspi->info.reqid = reqid; - userspi->info.family = src->get_family(src); - userspi->min = min; - userspi->max = max; - - if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWSA: - { - struct xfrm_usersa_info* usersa = NLMSG_DATA(hdr); - received_spi = usersa->id.spi; - break; - } - case NLMSG_ERROR: - { - struct nlmsgerr *err = NLMSG_DATA(hdr); - - DBG1(DBG_KNL, "allocating SPI failed: %s (%d)", - strerror(-err->error), -err->error); - break; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - free(out); - } - - if (received_spi == 0) - { - return FAILED; - } - - *spi = received_spi; - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.get_spi. - */ -static status_t get_spi(private_kernel_netlink_ipsec_t *this, - host_t *src, host_t *dst, - protocol_id_t protocol, u_int32_t reqid, - u_int32_t *spi) -{ - DBG2(DBG_KNL, "getting SPI for reqid {%u}", reqid); - - if (get_spi_internal(this, src, dst, proto_ike2kernel(protocol), - 0xc0000000, 0xcFFFFFFF, reqid, spi) != SUCCESS) - { - DBG1(DBG_KNL, "unable to get SPI for reqid {%u}", reqid); - return FAILED; - } - - DBG2(DBG_KNL, "got SPI %.8x for reqid {%u}", ntohl(*spi), reqid); - - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.get_cpi. - */ -static status_t get_cpi(private_kernel_netlink_ipsec_t *this, - host_t *src, host_t *dst, - u_int32_t reqid, u_int16_t *cpi) -{ - u_int32_t received_spi = 0; - - DBG2(DBG_KNL, "getting CPI for reqid {%u}", reqid); - - if (get_spi_internal(this, src, dst, - IPPROTO_COMP, 0x100, 0xEFFF, reqid, &received_spi) != SUCCESS) - { - DBG1(DBG_KNL, "unable to get CPI for reqid {%u}", reqid); - return FAILED; - } - - *cpi = htons((u_int16_t)ntohl(received_spi)); - - DBG2(DBG_KNL, "got CPI %.4x for reqid {%u}", ntohs(*cpi), reqid); - - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.add_sa. - */ -static status_t add_sa(private_kernel_netlink_ipsec_t *this, - host_t *src, host_t *dst, u_int32_t spi, - protocol_id_t protocol, u_int32_t reqid, - lifetime_cfg_t *lifetime, - u_int16_t enc_alg, chunk_t enc_key, - u_int16_t int_alg, chunk_t int_key, - ipsec_mode_t mode, u_int16_t ipcomp, u_int16_t cpi, - bool encap, bool inbound, - traffic_selector_t* src_ts, traffic_selector_t* dst_ts) -{ - netlink_buf_t request; - char *alg_name; - struct nlmsghdr *hdr; - struct xfrm_usersa_info *sa; - u_int16_t icv_size = 64; - - /* if IPComp is used, we install an additional IPComp SA. if the cpi is 0 - * we are in the recursive call below */ - if (ipcomp != IPCOMP_NONE && cpi != 0) - { - lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}}; - add_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, reqid, &lft, - ENCR_UNDEFINED, chunk_empty, AUTH_UNDEFINED, chunk_empty, - mode, ipcomp, 0, FALSE, inbound, NULL, NULL); - ipcomp = IPCOMP_NONE; - /* use transport mode ESP SA, IPComp uses tunnel mode */ - mode = MODE_TRANSPORT; - } - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}", - ntohl(spi), reqid); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = inbound ? XFRM_MSG_UPDSA : XFRM_MSG_NEWSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)); - - sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr); - host2xfrm(src, &sa->saddr); - host2xfrm(dst, &sa->id.daddr); - sa->id.spi = spi; - sa->id.proto = proto_ike2kernel(protocol); - sa->family = src->get_family(src); - sa->mode = mode2kernel(mode); - switch (mode) - { - case MODE_TUNNEL: - sa->flags |= XFRM_STATE_AF_UNSPEC; - break; - case MODE_BEET: - if(src_ts && dst_ts) - { - sa->sel = ts2selector(src_ts, dst_ts); - } - break; - default: - break; - } - - sa->replay_window = (protocol == IPPROTO_COMP) ? 0 : 32; - sa->reqid = reqid; - sa->lft.soft_byte_limit = XFRM_LIMIT(lifetime->bytes.rekey); - sa->lft.hard_byte_limit = XFRM_LIMIT(lifetime->bytes.life); - sa->lft.soft_packet_limit = XFRM_LIMIT(lifetime->packets.rekey); - sa->lft.hard_packet_limit = XFRM_LIMIT(lifetime->packets.life); - /* we use lifetimes since added, not since used */ - sa->lft.soft_add_expires_seconds = lifetime->time.rekey; - sa->lft.hard_add_expires_seconds = lifetime->time.life; - sa->lft.soft_use_expires_seconds = 0; - sa->lft.hard_use_expires_seconds = 0; - - struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_usersa_info); - - switch (enc_alg) - { - case ENCR_UNDEFINED: - /* no encryption */ - break; - case ENCR_AES_CCM_ICV16: - case ENCR_AES_GCM_ICV16: - case ENCR_CAMELLIA_CCM_ICV16: - icv_size += 32; - /* FALL */ - case ENCR_AES_CCM_ICV12: - case ENCR_AES_GCM_ICV12: - case ENCR_CAMELLIA_CCM_ICV12: - icv_size += 32; - /* FALL */ - case ENCR_AES_CCM_ICV8: - case ENCR_AES_GCM_ICV8: - case ENCR_CAMELLIA_CCM_ICV8: - { - struct xfrm_algo_aead *algo; - - alg_name = lookup_algorithm(encryption_algs, enc_alg); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - encryption_algorithm_names, enc_alg); - return FAILED; - } - DBG2(DBG_KNL, " using encryption algorithm %N with key size %d", - encryption_algorithm_names, enc_alg, enc_key.len * 8); - - rthdr->rta_type = XFRMA_ALG_AEAD; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_aead) + enc_key.len); - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - algo = (struct xfrm_algo_aead*)RTA_DATA(rthdr); - algo->alg_key_len = enc_key.len * 8; - algo->alg_icv_len = icv_size; - strcpy(algo->alg_name, alg_name); - memcpy(algo->alg_key, enc_key.ptr, enc_key.len); - - rthdr = XFRM_RTA_NEXT(rthdr); - break; - } - default: - { - struct xfrm_algo *algo; - - alg_name = lookup_algorithm(encryption_algs, enc_alg); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - encryption_algorithm_names, enc_alg); - return FAILED; - } - DBG2(DBG_KNL, " using encryption algorithm %N with key size %d", - encryption_algorithm_names, enc_alg, enc_key.len * 8); - - rthdr->rta_type = XFRMA_ALG_CRYPT; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + enc_key.len); - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - algo = (struct xfrm_algo*)RTA_DATA(rthdr); - algo->alg_key_len = enc_key.len * 8; - strcpy(algo->alg_name, alg_name); - memcpy(algo->alg_key, enc_key.ptr, enc_key.len); - - rthdr = XFRM_RTA_NEXT(rthdr); - } - } - - if (int_alg != AUTH_UNDEFINED) - { - alg_name = lookup_algorithm(integrity_algs, int_alg); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - integrity_algorithm_names, int_alg); - return FAILED; - } - DBG2(DBG_KNL, " using integrity algorithm %N with key size %d", - integrity_algorithm_names, int_alg, int_key.len * 8); - - if (int_alg == AUTH_HMAC_SHA2_256_128) - { - struct xfrm_algo_auth* algo; - - /* the kernel uses SHA256 with 96 bit truncation by default, - * use specified truncation size supported by newer kernels */ - rthdr->rta_type = XFRMA_ALG_AUTH_TRUNC; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo_auth) + int_key.len); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - algo = (struct xfrm_algo_auth*)RTA_DATA(rthdr); - algo->alg_key_len = int_key.len * 8; - algo->alg_trunc_len = 128; - strcpy(algo->alg_name, alg_name); - memcpy(algo->alg_key, int_key.ptr, int_key.len); - } - else - { - struct xfrm_algo* algo; - - rthdr->rta_type = XFRMA_ALG_AUTH; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo) + int_key.len); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - algo = (struct xfrm_algo*)RTA_DATA(rthdr); - algo->alg_key_len = int_key.len * 8; - strcpy(algo->alg_name, alg_name); - memcpy(algo->alg_key, int_key.ptr, int_key.len); - } - rthdr = XFRM_RTA_NEXT(rthdr); - } - - if (ipcomp != IPCOMP_NONE) - { - rthdr->rta_type = XFRMA_ALG_COMP; - alg_name = lookup_algorithm(compression_algs, ipcomp); - if (alg_name == NULL) - { - DBG1(DBG_KNL, "algorithm %N not supported by kernel!", - ipcomp_transform_names, ipcomp); - return FAILED; - } - DBG2(DBG_KNL, " using compression algorithm %N", - ipcomp_transform_names, ipcomp); - - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_algo)); - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - struct xfrm_algo* algo = (struct xfrm_algo*)RTA_DATA(rthdr); - algo->alg_key_len = 0; - strcpy(algo->alg_name, alg_name); - - rthdr = XFRM_RTA_NEXT(rthdr); - } - - if (encap) - { - rthdr->rta_type = XFRMA_ENCAP; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl)); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - struct xfrm_encap_tmpl* tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rthdr); - tmpl->encap_type = UDP_ENCAP_ESPINUDP; - tmpl->encap_sport = htons(src->get_port(src)); - tmpl->encap_dport = htons(dst->get_port(dst)); - memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t)); - /* encap_oa could probably be derived from the - * traffic selectors [rfc4306, p39]. In the netlink kernel implementation - * pluto does the same as we do here but it uses encap_oa in the - * pfkey implementation. BUT as /usr/src/linux/net/key/af_key.c indicates - * the kernel ignores it anyway - * -> does that mean that NAT-T encap doesn't work in transport mode? - * No. The reason the kernel ignores NAT-OA is that it recomputes - * (or, rather, just ignores) the checksum. If packets pass - * the IPsec checks it marks them "checksum ok" so OA isn't needed. */ - rthdr = XFRM_RTA_NEXT(rthdr); - } - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(spi)); - return FAILED; - } - return SUCCESS; -} - -/** - * Get the replay state (i.e. sequence numbers) of an SA. - */ -static status_t get_replay_state(private_kernel_netlink_ipsec_t *this, - u_int32_t spi, protocol_id_t protocol, host_t *dst, - struct xfrm_replay_state *replay) -{ - netlink_buf_t request; - struct nlmsghdr *hdr, *out = NULL; - struct xfrm_aevent_id *out_aevent = NULL, *aevent_id; - size_t len; - struct rtattr *rta; - size_t rtasize; - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "querying replay state from SAD entry with SPI %.8x", ntohl(spi)); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - hdr->nlmsg_type = XFRM_MSG_GETAE; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id)); - - aevent_id = (struct xfrm_aevent_id*)NLMSG_DATA(hdr); - aevent_id->flags = XFRM_AE_RVAL; - - host2xfrm(dst, &aevent_id->sa_id.daddr); - aevent_id->sa_id.spi = spi; - aevent_id->sa_id.proto = proto_ike2kernel(protocol); - aevent_id->sa_id.family = dst->get_family(dst); - - if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWAE: - { - out_aevent = NLMSG_DATA(hdr); - break; - } - case NLMSG_ERROR: - { - struct nlmsgerr *err = NLMSG_DATA(hdr); - DBG1(DBG_KNL, "querying replay state from SAD entry failed: %s (%d)", - strerror(-err->error), -err->error); - break; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - } - - if (out_aevent == NULL) - { - DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x", - ntohl(spi)); - free(out); - return FAILED; - } - - rta = XFRM_RTA(out, struct xfrm_aevent_id); - rtasize = XFRM_PAYLOAD(out, struct xfrm_aevent_id); - while(RTA_OK(rta, rtasize)) - { - if (rta->rta_type == XFRMA_REPLAY_VAL && - RTA_PAYLOAD(rta) == sizeof(struct xfrm_replay_state)) - { - memcpy(replay, RTA_DATA(rta), RTA_PAYLOAD(rta)); - free(out); - return SUCCESS; - } - rta = RTA_NEXT(rta, rtasize); - } - - DBG1(DBG_KNL, "unable to query replay state from SAD entry with SPI %.8x", - ntohl(spi)); - free(out); - return FAILED; -} - -/** - * Implementation of kernel_interface_t.query_sa. - */ -static status_t query_sa(private_kernel_netlink_ipsec_t *this, host_t *src, - host_t *dst, u_int32_t spi, protocol_id_t protocol, - u_int64_t *bytes) -{ - netlink_buf_t request; - struct nlmsghdr *out = NULL, *hdr; - struct xfrm_usersa_id *sa_id; - struct xfrm_usersa_info *sa = NULL; - size_t len; - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(spi)); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - hdr->nlmsg_type = XFRM_MSG_GETSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)); - - sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr); - host2xfrm(dst, &sa_id->daddr); - sa_id->spi = spi; - sa_id->proto = proto_ike2kernel(protocol); - sa_id->family = dst->get_family(dst); - - if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWSA: - { - sa = (struct xfrm_usersa_info*)NLMSG_DATA(hdr); - break; - } - case NLMSG_ERROR: - { - struct nlmsgerr *err = NLMSG_DATA(hdr); - DBG1(DBG_KNL, "querying SAD entry with SPI %.8x failed: %s (%d)", - ntohl(spi), strerror(-err->error), -err->error); - break; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - } - - if (sa == NULL) - { - DBG2(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(spi)); - free(out); - return FAILED; - } - *bytes = sa->curlft.bytes; - - free(out); - return SUCCESS; -} -/** - * Implementation of kernel_interface_t.del_sa. - */ -static status_t del_sa(private_kernel_netlink_ipsec_t *this, host_t *src, - host_t *dst, u_int32_t spi, protocol_id_t protocol, - u_int16_t cpi) -{ - netlink_buf_t request; - struct nlmsghdr *hdr; - struct xfrm_usersa_id *sa_id; - - /* if IPComp was used, we first delete the additional IPComp SA */ - if (cpi) - { - del_sa(this, src, dst, htonl(ntohs(cpi)), IPPROTO_COMP, 0); - } - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(spi)); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = XFRM_MSG_DELSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)); - - sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr); - host2xfrm(dst, &sa_id->daddr); - sa_id->spi = spi; - sa_id->proto = proto_ike2kernel(protocol); - sa_id->family = dst->get_family(dst); - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(spi)); - return FAILED; - } - DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(spi)); - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.update_sa. - */ -static status_t update_sa(private_kernel_netlink_ipsec_t *this, - u_int32_t spi, protocol_id_t protocol, u_int16_t cpi, - host_t *src, host_t *dst, - host_t *new_src, host_t *new_dst, - bool old_encap, bool new_encap) -{ - netlink_buf_t request; - u_char *pos; - struct nlmsghdr *hdr, *out = NULL; - struct xfrm_usersa_id *sa_id; - struct xfrm_usersa_info *out_sa = NULL, *sa; - size_t len; - struct rtattr *rta; - size_t rtasize; - struct xfrm_encap_tmpl* tmpl = NULL; - bool got_replay_state = FALSE; - struct xfrm_replay_state replay; - - /* if IPComp is used, we first update the IPComp SA */ - if (cpi) - { - update_sa(this, htonl(ntohs(cpi)), IPPROTO_COMP, 0, - src, dst, new_src, new_dst, FALSE, FALSE); - } - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "querying SAD entry with SPI %.8x for update", ntohl(spi)); - - /* query the existing SA first */ - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - hdr->nlmsg_type = XFRM_MSG_GETSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_id)); - - sa_id = (struct xfrm_usersa_id*)NLMSG_DATA(hdr); - host2xfrm(dst, &sa_id->daddr); - sa_id->spi = spi; - sa_id->proto = proto_ike2kernel(protocol); - sa_id->family = dst->get_family(dst); - - if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWSA: - { - out_sa = NLMSG_DATA(hdr); - break; - } - case NLMSG_ERROR: - { - struct nlmsgerr *err = NLMSG_DATA(hdr); - DBG1(DBG_KNL, "querying SAD entry failed: %s (%d)", - strerror(-err->error), -err->error); - break; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - } - if (out_sa == NULL) - { - DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi)); - free(out); - return FAILED; - } - - /* try to get the replay state */ - if (get_replay_state(this, spi, protocol, dst, &replay) == SUCCESS) - { - got_replay_state = TRUE; - } - - /* delete the old SA (without affecting the IPComp SA) */ - if (del_sa(this, src, dst, spi, protocol, 0) != SUCCESS) - { - DBG1(DBG_KNL, "unable to delete old SAD entry with SPI %.8x", ntohl(spi)); - free(out); - return FAILED; - } - - DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H", - ntohl(spi), src, dst, new_src, new_dst); - /* copy over the SA from out to request */ - hdr = (struct nlmsghdr*)request; - memcpy(hdr, out, min(out->nlmsg_len, sizeof(request))); - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = XFRM_MSG_NEWSA; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_info)); - sa = NLMSG_DATA(hdr); - sa->family = new_dst->get_family(new_dst); - - if (!src->ip_equals(src, new_src)) - { - host2xfrm(new_src, &sa->saddr); - } - if (!dst->ip_equals(dst, new_dst)) - { - host2xfrm(new_dst, &sa->id.daddr); - } - - rta = XFRM_RTA(out, struct xfrm_usersa_info); - rtasize = XFRM_PAYLOAD(out, struct xfrm_usersa_info); - pos = (u_char*)XFRM_RTA(hdr, struct xfrm_usersa_info); - while(RTA_OK(rta, rtasize)) - { - /* copy all attributes, but not XFRMA_ENCAP if we are disabling it */ - if (rta->rta_type != XFRMA_ENCAP || new_encap) - { - if (rta->rta_type == XFRMA_ENCAP) - { /* update encap tmpl */ - tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta); - tmpl->encap_sport = ntohs(new_src->get_port(new_src)); - tmpl->encap_dport = ntohs(new_dst->get_port(new_dst)); - } - memcpy(pos, rta, rta->rta_len); - pos += RTA_ALIGN(rta->rta_len); - hdr->nlmsg_len += RTA_ALIGN(rta->rta_len); - } - rta = RTA_NEXT(rta, rtasize); - } - - rta = (struct rtattr*)pos; - if (tmpl == NULL && new_encap) - { /* add tmpl if we are enabling it */ - rta->rta_type = XFRMA_ENCAP; - rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_encap_tmpl)); - - hdr->nlmsg_len += rta->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - tmpl = (struct xfrm_encap_tmpl*)RTA_DATA(rta); - tmpl->encap_type = UDP_ENCAP_ESPINUDP; - tmpl->encap_sport = ntohs(new_src->get_port(new_src)); - tmpl->encap_dport = ntohs(new_dst->get_port(new_dst)); - memset(&tmpl->encap_oa, 0, sizeof (xfrm_address_t)); - - rta = XFRM_RTA_NEXT(rta); - } - - if (got_replay_state) - { /* copy the replay data if available */ - rta->rta_type = XFRMA_REPLAY_VAL; - rta->rta_len = RTA_LENGTH(sizeof(struct xfrm_replay_state)); - - hdr->nlmsg_len += rta->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - memcpy(RTA_DATA(rta), &replay, sizeof(replay)); - - rta = XFRM_RTA_NEXT(rta); - } - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(spi)); - free(out); - return FAILED; - } - free(out); - - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.add_policy. - */ -static status_t add_policy(private_kernel_netlink_ipsec_t *this, - host_t *src, host_t *dst, - traffic_selector_t *src_ts, - traffic_selector_t *dst_ts, - policy_dir_t direction, u_int32_t spi, - protocol_id_t protocol, u_int32_t reqid, - ipsec_mode_t mode, u_int16_t ipcomp, u_int16_t cpi, - bool routed) -{ - policy_entry_t *current, *policy; - bool found = FALSE; - netlink_buf_t request; - struct xfrm_userpolicy_info *policy_info; - struct nlmsghdr *hdr; - - /* create a policy */ - policy = malloc_thing(policy_entry_t); - memset(policy, 0, sizeof(policy_entry_t)); - policy->sel = ts2selector(src_ts, dst_ts); - policy->direction = direction; - - /* find the policy, which matches EXACTLY */ - this->mutex->lock(this->mutex); - current = this->policies->get(this->policies, policy); - if (current) - { - /* use existing policy */ - current->refcount++; - DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing " - "refcount", src_ts, dst_ts, - policy_dir_names, direction); - free(policy); - policy = current; - found = TRUE; - } - else - { /* apply the new one, if we have no such policy */ - this->policies->put(this->policies, policy, policy); - policy->refcount = 1; - } - - DBG2(DBG_KNL, "adding policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - - memset(&request, 0, sizeof(request)); - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = found ? XFRM_MSG_UPDPOLICY : XFRM_MSG_NEWPOLICY; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_info)); - - policy_info = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr); - policy_info->sel = policy->sel; - policy_info->dir = policy->direction; - /* calculate priority based on source selector size, small size = high prio */ - policy_info->priority = routed ? PRIO_LOW : PRIO_HIGH; - policy_info->priority -= policy->sel.prefixlen_s * 10; - policy_info->priority -= policy->sel.proto ? 2 : 0; - policy_info->priority -= policy->sel.sport_mask ? 1 : 0; - policy_info->action = XFRM_POLICY_ALLOW; - policy_info->share = XFRM_SHARE_ANY; - this->mutex->unlock(this->mutex); - - /* policies don't expire */ - policy_info->lft.soft_byte_limit = XFRM_INF; - policy_info->lft.soft_packet_limit = XFRM_INF; - policy_info->lft.hard_byte_limit = XFRM_INF; - policy_info->lft.hard_packet_limit = XFRM_INF; - policy_info->lft.soft_add_expires_seconds = 0; - policy_info->lft.hard_add_expires_seconds = 0; - policy_info->lft.soft_use_expires_seconds = 0; - policy_info->lft.hard_use_expires_seconds = 0; - - struct rtattr *rthdr = XFRM_RTA(hdr, struct xfrm_userpolicy_info); - rthdr->rta_type = XFRMA_TMPL; - rthdr->rta_len = RTA_LENGTH(sizeof(struct xfrm_user_tmpl)); - - hdr->nlmsg_len += rthdr->rta_len; - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - struct xfrm_user_tmpl *tmpl = (struct xfrm_user_tmpl*)RTA_DATA(rthdr); - - if (ipcomp != IPCOMP_NONE) - { - tmpl->reqid = reqid; - tmpl->id.proto = IPPROTO_COMP; - tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0; - tmpl->mode = mode2kernel(mode); - tmpl->optional = direction != POLICY_OUT; - tmpl->family = src->get_family(src); - - host2xfrm(src, &tmpl->saddr); - host2xfrm(dst, &tmpl->id.daddr); - - /* add an additional xfrm_user_tmpl */ - rthdr->rta_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl)); - hdr->nlmsg_len += RTA_LENGTH(sizeof(struct xfrm_user_tmpl)); - if (hdr->nlmsg_len > sizeof(request)) - { - return FAILED; - } - - tmpl++; - - /* use transport mode for ESP if we have a tunnel mode IPcomp SA */ - mode = MODE_TRANSPORT; - } - else - { - /* when using IPcomp, only the IPcomp SA uses tmp src/dst addresses */ - host2xfrm(src, &tmpl->saddr); - host2xfrm(dst, &tmpl->id.daddr); - } - - tmpl->reqid = reqid; - tmpl->id.proto = proto_ike2kernel(protocol); - tmpl->aalgos = tmpl->ealgos = tmpl->calgos = ~0; - tmpl->mode = mode2kernel(mode); - tmpl->family = src->get_family(src); - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unable to add policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - return FAILED; - } - - /* install a route, if: - * - we are NOT updating a policy - * - this is a forward policy (to just get one for each child) - * - we are in tunnel/BEET mode - * - routing is not disabled via strongswan.conf - */ - if (policy->route == NULL && direction == POLICY_FWD && - mode != MODE_TRANSPORT && this->install_routes) - { - route_entry_t *route = malloc_thing(route_entry_t); - - if (charon->kernel_interface->get_address_by_ts(charon->kernel_interface, - dst_ts, &route->src_ip) == SUCCESS) - { - /* get the nexthop to src (src as we are in POLICY_FWD).*/ - route->gateway = charon->kernel_interface->get_nexthop( - charon->kernel_interface, src); - /* install route via outgoing interface */ - route->if_name = charon->kernel_interface->get_interface( - charon->kernel_interface, dst); - route->dst_net = chunk_alloc(policy->sel.family == AF_INET ? 4 : 16); - memcpy(route->dst_net.ptr, &policy->sel.saddr, route->dst_net.len); - route->prefixlen = policy->sel.prefixlen_s; - - if (route->if_name) - { - switch (charon->kernel_interface->add_route( - charon->kernel_interface, route->dst_net, - route->prefixlen, route->gateway, - route->src_ip, route->if_name)) - { - default: - DBG1(DBG_KNL, "unable to install source route for %H", - route->src_ip); - /* FALL */ - case ALREADY_DONE: - /* route exists, do not uninstall */ - route_entry_destroy(route); - break; - case SUCCESS: - /* cache the installed route */ - policy->route = route; - break; - } - } - else - { - route_entry_destroy(route); - } - } - else - { - free(route); - } - } - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.query_policy. - */ -static status_t query_policy(private_kernel_netlink_ipsec_t *this, - traffic_selector_t *src_ts, - traffic_selector_t *dst_ts, - policy_dir_t direction, u_int32_t *use_time) -{ - netlink_buf_t request; - struct nlmsghdr *out = NULL, *hdr; - struct xfrm_userpolicy_id *policy_id; - struct xfrm_userpolicy_info *policy = NULL; - size_t len; - - memset(&request, 0, sizeof(request)); - - DBG2(DBG_KNL, "querying policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST; - hdr->nlmsg_type = XFRM_MSG_GETPOLICY; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)); - - policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr); - policy_id->sel = ts2selector(src_ts, dst_ts); - policy_id->dir = direction; - - if (this->socket_xfrm->send(this->socket_xfrm, hdr, &out, &len) == SUCCESS) - { - hdr = out; - while (NLMSG_OK(hdr, len)) - { - switch (hdr->nlmsg_type) - { - case XFRM_MSG_NEWPOLICY: - { - policy = (struct xfrm_userpolicy_info*)NLMSG_DATA(hdr); - break; - } - case NLMSG_ERROR: - { - struct nlmsgerr *err = NLMSG_DATA(hdr); - DBG1(DBG_KNL, "querying policy failed: %s (%d)", - strerror(-err->error), -err->error); - break; - } - default: - hdr = NLMSG_NEXT(hdr, len); - continue; - case NLMSG_DONE: - break; - } - break; - } - } - - if (policy == NULL) - { - DBG2(DBG_KNL, "unable to query policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - free(out); - return FAILED; - } - - if (policy->curlft.use_time) - { - /* we need the monotonic time, but the kernel returns system time. */ - *use_time = time_monotonic(NULL) - (time(NULL) - policy->curlft.use_time); - } - else - { - *use_time = 0; - } - - free(out); - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.del_policy. - */ -static status_t del_policy(private_kernel_netlink_ipsec_t *this, - traffic_selector_t *src_ts, - traffic_selector_t *dst_ts, - policy_dir_t direction, bool unrouted) -{ - policy_entry_t *current, policy, *to_delete = NULL; - route_entry_t *route; - netlink_buf_t request; - struct nlmsghdr *hdr; - struct xfrm_userpolicy_id *policy_id; - - DBG2(DBG_KNL, "deleting policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - - /* create a policy */ - memset(&policy, 0, sizeof(policy_entry_t)); - policy.sel = ts2selector(src_ts, dst_ts); - policy.direction = direction; - - /* find the policy */ - this->mutex->lock(this->mutex); - current = this->policies->get(this->policies, &policy); - if (current) - { - to_delete = current; - if (--to_delete->refcount > 0) - { - /* is used by more SAs, keep in kernel */ - DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed"); - this->mutex->unlock(this->mutex); - return SUCCESS; - } - /* remove if last reference */ - this->policies->remove(this->policies, to_delete); - } - this->mutex->unlock(this->mutex); - if (!to_delete) - { - DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", src_ts, - dst_ts, policy_dir_names, direction); - return NOT_FOUND; - } - - memset(&request, 0, sizeof(request)); - - hdr = (struct nlmsghdr*)request; - hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; - hdr->nlmsg_type = XFRM_MSG_DELPOLICY; - hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct xfrm_userpolicy_id)); - - policy_id = (struct xfrm_userpolicy_id*)NLMSG_DATA(hdr); - policy_id->sel = to_delete->sel; - policy_id->dir = direction; - - route = to_delete->route; - free(to_delete); - - if (this->socket_xfrm->send_ack(this->socket_xfrm, hdr) != SUCCESS) - { - DBG1(DBG_KNL, "unable to delete policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - return FAILED; - } - - if (route) - { - if (charon->kernel_interface->del_route(charon->kernel_interface, - route->dst_net, route->prefixlen, route->gateway, - route->src_ip, route->if_name) != SUCCESS) - { - DBG1(DBG_KNL, "error uninstalling route installed with " - "policy %R === %R %N", src_ts, dst_ts, - policy_dir_names, direction); - } - route_entry_destroy(route); - } - return SUCCESS; -} - -/** - * Implementation of kernel_interface_t.destroy. - */ -static void destroy(private_kernel_netlink_ipsec_t *this) -{ - enumerator_t *enumerator; - policy_entry_t *policy; - - this->job->cancel(this->job); - close(this->socket_xfrm_events); - this->socket_xfrm->destroy(this->socket_xfrm); - enumerator = this->policies->create_enumerator(this->policies); - while (enumerator->enumerate(enumerator, &policy, &policy)) - { - free(policy); - } - enumerator->destroy(enumerator); - this->policies->destroy(this->policies); - this->mutex->destroy(this->mutex); - free(this); -} - -/** - * Add bypass policies for IKE on the sockets used by charon - */ -static bool add_bypass_policies() -{ - int fd, family, port; - enumerator_t *sockets; - bool status = TRUE; - - sockets = charon->socket->create_enumerator(charon->socket); - while (sockets->enumerate(sockets, &fd, &family, &port)) - { - struct xfrm_userpolicy_info policy; - u_int sol, ipsec_policy; - - switch (family) - { - case AF_INET: - sol = SOL_IP; - ipsec_policy = IP_XFRM_POLICY; - break; - case AF_INET6: - sol = SOL_IPV6; - ipsec_policy = IPV6_XFRM_POLICY; - break; - default: - continue; - } - - memset(&policy, 0, sizeof(policy)); - policy.action = XFRM_POLICY_ALLOW; - policy.sel.family = family; - - policy.dir = XFRM_POLICY_OUT; - if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0) - { - DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s", - strerror(errno)); - status = FALSE; - break; - } - policy.dir = XFRM_POLICY_IN; - if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0) - { - DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s", - strerror(errno)); - status = FALSE; - break; - } - } - sockets->destroy(sockets); - return status; -} - -/* - * Described in header. - */ -kernel_netlink_ipsec_t *kernel_netlink_ipsec_create() -{ - private_kernel_netlink_ipsec_t *this = malloc_thing(private_kernel_netlink_ipsec_t); - struct sockaddr_nl addr; - int fd; - - /* public functions */ - this->public.interface.get_spi = (status_t(*)(kernel_ipsec_t*,host_t*,host_t*,protocol_id_t,u_int32_t,u_int32_t*))get_spi; - this->public.interface.get_cpi = (status_t(*)(kernel_ipsec_t*,host_t*,host_t*,u_int32_t,u_int16_t*))get_cpi; - this->public.interface.add_sa = (status_t(*)(kernel_ipsec_t *,host_t*,host_t*,u_int32_t,protocol_id_t,u_int32_t,lifetime_cfg_t*,u_int16_t,chunk_t,u_int16_t,chunk_t,ipsec_mode_t,u_int16_t,u_int16_t,bool,bool,traffic_selector_t*,traffic_selector_t*))add_sa; - this->public.interface.update_sa = (status_t(*)(kernel_ipsec_t*,u_int32_t,protocol_id_t,u_int16_t,host_t*,host_t*,host_t*,host_t*,bool,bool))update_sa; - this->public.interface.query_sa = (status_t(*)(kernel_ipsec_t*,host_t*,host_t*,u_int32_t,protocol_id_t,u_int64_t*))query_sa; - this->public.interface.del_sa = (status_t(*)(kernel_ipsec_t*,host_t*,host_t*,u_int32_t,protocol_id_t,u_int16_t))del_sa; - this->public.interface.add_policy = (status_t(*)(kernel_ipsec_t*,host_t*,host_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,u_int32_t,protocol_id_t,u_int32_t,ipsec_mode_t,u_int16_t,u_int16_t,bool))add_policy; - this->public.interface.query_policy = (status_t(*)(kernel_ipsec_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,u_int32_t*))query_policy; - this->public.interface.del_policy = (status_t(*)(kernel_ipsec_t*,traffic_selector_t*,traffic_selector_t*,policy_dir_t,bool))del_policy; - this->public.interface.destroy = (void(*)(kernel_ipsec_t*)) destroy; - - /* private members */ - this->policies = hashtable_create((hashtable_hash_t)policy_hash, - (hashtable_equals_t)policy_equals, 32); - this->mutex = mutex_create(MUTEX_TYPE_DEFAULT); - this->install_routes = lib->settings->get_bool(lib->settings, - "charon.install_routes", TRUE); - - /* disable lifetimes for allocated SPIs in kernel */ - fd = open("/proc/sys/net/core/xfrm_acq_expires", O_WRONLY); - if (fd) - { - ignore_result(write(fd, "165", 3)); - close(fd); - } - - this->socket_xfrm = netlink_socket_create(NETLINK_XFRM); - - memset(&addr, 0, sizeof(addr)); - addr.nl_family = AF_NETLINK; - - /* create and bind XFRM socket for ACQUIRE, EXPIRE, MIGRATE & MAPPING */ - this->socket_xfrm_events = socket(AF_NETLINK, SOCK_RAW, NETLINK_XFRM); - if (this->socket_xfrm_events <= 0) - { - charon->kill(charon, "unable to create XFRM event socket"); - } - addr.nl_groups = XFRMNLGRP(ACQUIRE) | XFRMNLGRP(EXPIRE) | - XFRMNLGRP(MIGRATE) | XFRMNLGRP(MAPPING); - if (bind(this->socket_xfrm_events, (struct sockaddr*)&addr, sizeof(addr))) - { - charon->kill(charon, "unable to bind XFRM event socket"); - } - - /* add bypass policies on the sockets used by charon */ - if (!add_bypass_policies()) - { - charon->kill(charon, "unable to add bypass policies on sockets"); - } - - this->job = callback_job_create((callback_job_cb_t)receive_events, - this, NULL, NULL); - charon->processor->queue_job(charon->processor, (job_t*)this->job); - - return &this->public; -} |