embedaddon/strongswan/src/libcharon/plugins/kernel_pfkey/kernel_pfkey_ipsec.c - view

File: [ELWIX - Embedded LightWeight unIX -] / embedaddon / strongswan / src / libcharon / plugins / kernel_pfkey / kernel_pfkey_ipsec.c
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs - revision graph
Wed Jun 3 09:46:45 2020 UTC (4 years, 1 month ago) by misho
Branches: strongswan, MAIN
CVS tags: v5_9_2p0, v5_8_4p7, HEAD

Strongswan

/* * Copyright (C) 2008-2018 Tobias Brunner * Copyright (C) 2008 Andreas Steffen * HSR 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. */ /* * Copyright (C) 2014 Nanoteq Pty Ltd * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include <stdint.h> #include <sys/types.h> #include <sys/socket.h> #ifdef __FreeBSD__ #include <limits.h> /* for LONG_MAX */ #endif #ifdef HAVE_NET_PFKEYV2_H #include <net/pfkeyv2.h> #else #include <linux/pfkeyv2.h> #endif #ifdef SADB_X_EXT_NAT_T_TYPE #define HAVE_NATT #endif #ifdef HAVE_NETIPSEC_IPSEC_H #include <netipsec/ipsec.h> #elif defined(HAVE_NETINET6_IPSEC_H) #include <netinet6/ipsec.h> #else #include <linux/ipsec.h> #endif #ifdef HAVE_NATT #ifdef HAVE_LINUX_UDP_H #include <linux/udp.h> #else #include <netinet/udp.h> #endif /*HAVE_LINUX_UDP_H*/ #endif /*HAVE_NATT*/ #include <unistd.h> #include <time.h> #include <errno.h> #ifdef __APPLE__ #include <sys/sysctl.h> #endif #include "kernel_pfkey_ipsec.h" #include <daemon.h> #include <utils/debug.h> #include <networking/host.h> #include <collections/linked_list.h> #include <collections/hashtable.h> #include <threading/mutex.h> /** non linux specific */ #ifndef IPPROTO_COMP #ifdef IPPROTO_IPCOMP #define IPPROTO_COMP IPPROTO_IPCOMP #endif #endif #ifndef SADB_X_AALG_SHA2_256HMAC #define SADB_X_AALG_SHA2_256HMAC SADB_X_AALG_SHA2_256 #define SADB_X_AALG_SHA2_384HMAC SADB_X_AALG_SHA2_384 #define SADB_X_AALG_SHA2_512HMAC SADB_X_AALG_SHA2_512 #endif #ifndef SADB_X_EALG_AESCBC #define SADB_X_EALG_AESCBC SADB_X_EALG_AES #endif #ifndef SADB_X_EALG_CASTCBC #define SADB_X_EALG_CASTCBC SADB_X_EALG_CAST128CBC #endif #if !defined(SADB_X_EALG_AES_GCM_ICV8) && defined(SADB_X_EALG_AESGCM8) #define SADB_X_EALG_AES_GCM_ICV8 SADB_X_EALG_AESGCM8 #define SADB_X_EALG_AES_GCM_ICV12 SADB_X_EALG_AESGCM12 #define SADB_X_EALG_AES_GCM_ICV16 SADB_X_EALG_AESGCM16 #endif #ifndef SOL_IP #define SOL_IP IPPROTO_IP #define SOL_IPV6 IPPROTO_IPV6 #endif /** from linux/in.h */ #ifndef IP_IPSEC_POLICY #define IP_IPSEC_POLICY 16 #endif /** missing on uclibc */ #ifndef IPV6_IPSEC_POLICY #define IPV6_IPSEC_POLICY 34 #endif /* from linux/udp.h */ #ifndef UDP_ENCAP #define UDP_ENCAP 100 #endif #ifndef UDP_ENCAP_ESPINUDP #define UDP_ENCAP_ESPINUDP 2 #endif /* this is not defined on some platforms */ #ifndef SOL_UDP #define SOL_UDP IPPROTO_UDP #endif /** Base priority for installed policies */ #define PRIO_BASE 200000 #ifdef __APPLE__ /** from xnu/bsd/net/pfkeyv2.h */ #define SADB_X_EXT_NATT 0x002 struct sadb_sa_2 { struct sadb_sa sa; uint16_t sadb_sa_natt_port; uint16_t sadb_reserved0; uint32_t sadb_reserved1; }; #endif /** buffer size for PF_KEY messages */ #define PFKEY_BUFFER_SIZE 4096 /** PF_KEY messages are 64 bit aligned */ #define PFKEY_ALIGNMENT 8 /** aligns len to 64 bits */ #define PFKEY_ALIGN(len) (((len) + PFKEY_ALIGNMENT - 1) & ~(PFKEY_ALIGNMENT - 1)) /** calculates the properly padded length in 64 bit chunks */ #define PFKEY_LEN(len) ((PFKEY_ALIGN(len) / PFKEY_ALIGNMENT)) /** calculates user mode length i.e. in bytes */ #define PFKEY_USER_LEN(len) ((len) * PFKEY_ALIGNMENT) /** given a PF_KEY message header and an extension this updates the length in the header */ #define PFKEY_EXT_ADD(msg, ext) ((msg)->sadb_msg_len += ((struct sadb_ext*)ext)->sadb_ext_len) /** given a PF_KEY message header this returns a pointer to the next extension */ #define PFKEY_EXT_ADD_NEXT(msg) ((struct sadb_ext*)(((char*)(msg)) + PFKEY_USER_LEN((msg)->sadb_msg_len))) /** copy an extension and append it to a PF_KEY message */ #define PFKEY_EXT_COPY(msg, ext) (PFKEY_EXT_ADD(msg, memcpy(PFKEY_EXT_ADD_NEXT(msg), ext, PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len)))) /** given a PF_KEY extension this returns a pointer to the next extension */ #define PFKEY_EXT_NEXT(ext) ((struct sadb_ext*)(((char*)(ext)) + PFKEY_USER_LEN(((struct sadb_ext*)ext)->sadb_ext_len))) /** given a PF_KEY extension this returns a pointer to the next extension also updates len (len in 64 bit words) */ #define PFKEY_EXT_NEXT_LEN(ext,len) ((len) -= (ext)->sadb_ext_len, PFKEY_EXT_NEXT(ext)) /** true if ext has a valid length and len is large enough to contain ext (assuming len in 64 bit words) */ #define PFKEY_EXT_OK(ext,len) ((len) >= PFKEY_LEN(sizeof(struct sadb_ext)) && \ (ext)->sadb_ext_len >= PFKEY_LEN(sizeof(struct sadb_ext)) && \ (ext)->sadb_ext_len <= (len)) typedef struct private_kernel_pfkey_ipsec_t private_kernel_pfkey_ipsec_t; /** * Private variables and functions of kernel_pfkey class. */ struct private_kernel_pfkey_ipsec_t { /** * Public part of the kernel_pfkey_t object. */ kernel_pfkey_ipsec_t public; /** * mutex to lock access to various lists */ mutex_t *mutex; /** * List of installed policies (policy_entry_t) */ linked_list_t *policies; /** * List of exclude routes (exclude_route_t) */ linked_list_t *excludes; /** * Hash table of IPsec SAs using policies (ipsec_sa_t) */ hashtable_t *sas; /** * whether to install routes along policies */ bool install_routes; /** * whether to install the route via internal interface */ bool route_via_internal; /** * mutex to lock access to the PF_KEY socket */ mutex_t *mutex_pfkey; /** * PF_KEY socket to communicate with the kernel */ int socket; /** * PF_KEY socket to receive acquire and expire events */ int socket_events; /** * sequence number for messages sent to the kernel */ int seq; }; typedef struct exclude_route_t exclude_route_t; /** * Exclude route definition */ struct exclude_route_t { /** destination address of exclude */ host_t *dst; /** source address for route */ host_t *src; /** nexthop exclude has been installed */ host_t *gtw; /** references to this route */ int refs; }; /** * clean up a route exclude entry */ static void exclude_route_destroy(exclude_route_t *this) { this->dst->destroy(this->dst); this->src->destroy(this->src); this->gtw->destroy(this->gtw); free(this); } 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 */ uint8_t prefixlen; /** reference to exclude route, if any */ exclude_route_t *exclude; }; /** * destroy an route_entry_t object */ static void route_entry_destroy(route_entry_t *this) { free(this->if_name); DESTROY_IF(this->src_ip); DESTROY_IF(this->gateway); chunk_free(&this->dst_net); free(this); } /** * compare two route_entry_t objects */ static bool route_entry_equals(route_entry_t *a, route_entry_t *b) { return a->if_name && b->if_name && streq(a->if_name, b->if_name) && a->src_ip->ip_equals(a->src_ip, b->src_ip) && a->gateway && b->gateway && a->gateway->ip_equals(a->gateway, b->gateway) && chunk_equals(a->dst_net, b->dst_net) && a->prefixlen == b->prefixlen; } typedef struct ipsec_sa_t ipsec_sa_t; /** * IPsec SA assigned to a policy. */ struct ipsec_sa_t { /** Source address of this SA */ host_t *src; /** Destination address of this SA */ host_t *dst; /** Description of this SA */ ipsec_sa_cfg_t cfg; /** Reference count for this SA */ refcount_t refcount; }; /** * Hash function for ipsec_sa_t objects */ static u_int ipsec_sa_hash(ipsec_sa_t *sa) { return chunk_hash_inc(sa->src->get_address(sa->src), chunk_hash_inc(sa->dst->get_address(sa->dst), chunk_hash(chunk_from_thing(sa->cfg)))); } /** * Equality function for ipsec_sa_t objects */ static bool ipsec_sa_equals(ipsec_sa_t *sa, ipsec_sa_t *other_sa) { return sa->src->ip_equals(sa->src, other_sa->src) && sa->dst->ip_equals(sa->dst, other_sa->dst) && ipsec_sa_cfg_equals(&sa->cfg, &other_sa->cfg); } /** * Allocate or reference an IPsec SA object */ static ipsec_sa_t *ipsec_sa_create(private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, ipsec_sa_cfg_t *cfg) { ipsec_sa_t *sa, *found; INIT(sa, .src = src, .dst = dst, .cfg = *cfg, ); found = this->sas->get(this->sas, sa); if (!found) { sa->src = src->clone(src); sa->dst = dst->clone(dst); this->sas->put(this->sas, sa, sa); } else { free(sa); sa = found; } ref_get(&sa->refcount); return sa; } /** * Release and destroy an IPsec SA object */ static void ipsec_sa_destroy(private_kernel_pfkey_ipsec_t *this, ipsec_sa_t *sa) { if (ref_put(&sa->refcount)) { this->sas->remove(this->sas, sa); DESTROY_IF(sa->src); DESTROY_IF(sa->dst); free(sa); } } typedef struct policy_sa_t policy_sa_t; typedef struct policy_sa_out_t policy_sa_out_t; /** * Mapping between a policy and an IPsec SA. */ struct policy_sa_t { /** Priority assigned to the policy when installed with this SA */ uint32_t priority; /** Base priority assigned to the policy when installed with this SA */ uint32_t auto_priority; /** Type of the policy */ policy_type_t type; /** Assigned SA */ ipsec_sa_t *sa; }; /** * For outbound policies we also cache the traffic selectors in order to install * the route. */ struct policy_sa_out_t { /** Generic interface */ policy_sa_t generic; /** Source traffic selector of this policy */ traffic_selector_t *src_ts; /** Destination traffic selector of this policy */ traffic_selector_t *dst_ts; }; /** * Create a policy_sa(_in)_t object */ static policy_sa_t *policy_sa_create(private_kernel_pfkey_ipsec_t *this, policy_dir_t dir, policy_type_t type, host_t *src, host_t *dst, traffic_selector_t *src_ts, traffic_selector_t *dst_ts, ipsec_sa_cfg_t *cfg) { policy_sa_t *policy; if (dir == POLICY_OUT) { policy_sa_out_t *out; INIT(out, .src_ts = src_ts->clone(src_ts), .dst_ts = dst_ts->clone(dst_ts), ); policy = &out->generic; } else { INIT(policy, .priority = 0); } policy->type = type; policy->sa = ipsec_sa_create(this, src, dst, cfg); return policy; } /** * Destroy a policy_sa(_in)_t object */ static void policy_sa_destroy(policy_sa_t *policy, policy_dir_t dir, private_kernel_pfkey_ipsec_t *this) { if (dir == POLICY_OUT) { policy_sa_out_t *out = (policy_sa_out_t*)policy; out->src_ts->destroy(out->src_ts); out->dst_ts->destroy(out->dst_ts); } ipsec_sa_destroy(this, policy->sa); free(policy); } CALLBACK(policy_sa_destroy_cb, void, policy_sa_t *policy, va_list args) { private_kernel_pfkey_ipsec_t *this; policy_dir_t dir; VA_ARGS_VGET(args, dir, this); policy_sa_destroy(policy, dir, this); } typedef struct policy_entry_t policy_entry_t; /** * installed kernel policy. */ struct policy_entry_t { /** Index assigned by the kernel */ uint32_t index; /** Direction of this policy: in, out, forward */ uint8_t direction; /** Parameters of installed policy */ struct { /** Subnet and port */ host_t *net; /** Subnet mask */ uint8_t mask; /** Protocol */ uint8_t proto; } src, dst; /** Associated route installed for this policy */ route_entry_t *route; /** List of SAs this policy is used by, ordered by priority */ linked_list_t *used_by; }; /** * Create a policy_entry_t object */ static policy_entry_t *create_policy_entry(traffic_selector_t *src_ts, traffic_selector_t *dst_ts, policy_dir_t dir) { policy_entry_t *policy; INIT(policy, .direction = dir, ); uint16_t port; uint8_t proto; src_ts->to_subnet(src_ts, &policy->src.net, &policy->src.mask); dst_ts->to_subnet(dst_ts, &policy->dst.net, &policy->dst.mask); /* src or dest proto may be "any" (0), use more restrictive one */ proto = max(src_ts->get_protocol(src_ts), dst_ts->get_protocol(dst_ts)); /* map the ports to ICMP type/code how the Linux kernel expects them, that * is, type in src, code in dst */ if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) { port = max(policy->src.net->get_port(policy->src.net), policy->dst.net->get_port(policy->dst.net)); policy->src.net->set_port(policy->src.net, traffic_selector_icmp_type(port)); policy->dst.net->set_port(policy->dst.net, traffic_selector_icmp_code(port)); } else if (!proto) { proto = IPSEC_PROTO_ANY; } policy->src.proto = policy->dst.proto = proto; return policy; } /** * Destroy a policy_entry_t object */ static void policy_entry_destroy(policy_entry_t *policy, private_kernel_pfkey_ipsec_t *this) { if (policy->route) { route_entry_destroy(policy->route); } if (policy->used_by) { policy->used_by->invoke_function(policy->used_by, policy_sa_destroy_cb, policy->direction, this); policy->used_by->destroy(policy->used_by); } DESTROY_IF(policy->src.net); DESTROY_IF(policy->dst.net); free(policy); } CALLBACK(policy_entry_destroy_cb, void, policy_entry_t *policy, va_list args) { private_kernel_pfkey_ipsec_t *this; VA_ARGS_VGET(args, this); policy_entry_destroy(policy, this); } CALLBACK(policy_entry_equals, bool, policy_entry_t *current, va_list args) { policy_entry_t *policy; VA_ARGS_VGET(args, policy); return current->direction == policy->direction && current->src.proto == policy->src.proto && current->dst.proto == policy->dst.proto && current->src.mask == policy->src.mask && current->dst.mask == policy->dst.mask && current->src.net->equals(current->src.net, policy->src.net) && current->dst.net->equals(current->dst.net, policy->dst.net); } CALLBACK(policy_entry_match_byindex, bool, policy_entry_t *current, va_list args) { uint32_t index; VA_ARGS_VGET(args, index); return current->index == index; } /** * Calculate the priority of a policy * * This is the same formula we use in the kernel-netlink interface, but some * features are currently not or only partially supported by PF_KEY. * * bits 0-0: separate trap and regular policies (0..1) 1 bit * bits 1-1: reserved for interface restriction (0..1) 1 bit * bits 2-7: src + dst port mask bits (2 * 0..16) 6 bits * bits 8-8: restriction to protocol (0..1) 1 bit * bits 9-17: src + dst network mask bits (2 * 0..128) 9 bits * 18 bits * * smallest value: 000000000 0 000000 0 0: 0, lowest priority = 100'000 * largest value : 100000000 1 100000 0 1: 131'457, highst priority = 68'543 */ static inline uint32_t get_priority(policy_entry_t *policy, policy_priority_t prio) { uint32_t priority = PRIO_BASE; switch (prio) { case POLICY_PRIORITY_FALLBACK: priority += PRIO_BASE; /* fall-through */ case POLICY_PRIORITY_ROUTED: case POLICY_PRIORITY_DEFAULT: priority += PRIO_BASE; /* fall-through */ case POLICY_PRIORITY_PASS: break; } /* calculate priority */ priority -= (policy->src.mask + policy->dst.mask) * 512; priority -= policy->src.proto != IPSEC_PROTO_ANY ? 256 : 0; priority -= policy->src.net->get_port(policy->src.net) ? 64 : 0; priority -= policy->dst.net->get_port(policy->dst.net) ? 64 : 0; priority -= (prio != POLICY_PRIORITY_ROUTED); return priority; } typedef struct pfkey_msg_t pfkey_msg_t; struct pfkey_msg_t { /** * PF_KEY message base */ struct sadb_msg *msg; /** * PF_KEY message extensions */ union { struct sadb_ext *ext[SADB_EXT_MAX + 1]; struct { struct sadb_ext *reserved; /* SADB_EXT_RESERVED */ struct sadb_sa *sa; /* SADB_EXT_SA */ struct sadb_lifetime *lft_current; /* SADB_EXT_LIFETIME_CURRENT */ struct sadb_lifetime *lft_hard; /* SADB_EXT_LIFETIME_HARD */ struct sadb_lifetime *lft_soft; /* SADB_EXT_LIFETIME_SOFT */ struct sadb_address *src; /* SADB_EXT_ADDRESS_SRC */ struct sadb_address *dst; /* SADB_EXT_ADDRESS_DST */ struct sadb_address *proxy; /* SADB_EXT_ADDRESS_PROXY */ struct sadb_key *key_auth; /* SADB_EXT_KEY_AUTH */ struct sadb_key *key_encr; /* SADB_EXT_KEY_ENCRYPT */ struct sadb_ident *id_src; /* SADB_EXT_IDENTITY_SRC */ struct sadb_ident *id_dst; /* SADB_EXT_IDENTITY_DST */ struct sadb_sens *sensitivity; /* SADB_EXT_SENSITIVITY */ struct sadb_prop *proposal; /* SADB_EXT_PROPOSAL */ struct sadb_supported *supported_auth; /* SADB_EXT_SUPPORTED_AUTH */ struct sadb_supported *supported_encr; /* SADB_EXT_SUPPORTED_ENCRYPT */ struct sadb_spirange *spirange; /* SADB_EXT_SPIRANGE */ struct sadb_x_kmprivate *x_kmprivate; /* SADB_X_EXT_KMPRIVATE */ struct sadb_x_policy *x_policy; /* SADB_X_EXT_POLICY */ struct sadb_x_sa2 *x_sa2; /* SADB_X_EXT_SA2 */ #if defined(__linux__) || defined (__FreeBSD__) struct sadb_x_nat_t_type *x_natt_type; /* SADB_X_EXT_NAT_T_TYPE */ struct sadb_x_nat_t_port *x_natt_sport; /* SADB_X_EXT_NAT_T_SPORT */ struct sadb_x_nat_t_port *x_natt_dport; /* SADB_X_EXT_NAT_T_DPORT */ #ifdef __linux__ struct sadb_address *x_natt_oa; /* SADB_X_EXT_NAT_T_OA */ struct sadb_x_sec_ctx *x_sec_ctx; /* SADB_X_EXT_SEC_CTX */ struct sadb_x_kmaddress *x_kmaddress; /* SADB_X_EXT_KMADDRESS */ #else struct sadb_address *x_natt_oai; /* SADB_X_EXT_NAT_T_OAI */ struct sadb_address *x_natt_oar; /* SADB_X_EXT_NAT_T_OAR */ #ifdef SADB_X_EXT_NAT_T_FRAG struct sadb_x_nat_t_frag *x_natt_frag; /* SADB_X_EXT_NAT_T_FRAG */ #ifdef SADB_X_EXT_SA_REPLAY struct sadb_x_sa_replay *x_replay; /* SADB_X_EXT_SA_REPLAY */ struct sadb_address *x_new_addr_src; /* SADB_X_EXT_NEW_ADDRESS_SRC */ struct sadb_address *x_new_addr_dst; /* SADB_X_EXT_NEW_ADDRESS_DST */ #endif #endif #endif /* __linux__ */ #endif /* __linux__ || __FreeBSD__ */ } __attribute__((__packed__)); }; }; ENUM(sadb_ext_type_names, SADB_EXT_RESERVED, SADB_EXT_MAX, "SADB_EXT_RESERVED", "SADB_EXT_SA", "SADB_EXT_LIFETIME_CURRENT", "SADB_EXT_LIFETIME_HARD", "SADB_EXT_LIFETIME_SOFT", "SADB_EXT_ADDRESS_SRC", "SADB_EXT_ADDRESS_DST", "SADB_EXT_ADDRESS_PROXY", "SADB_EXT_KEY_AUTH", "SADB_EXT_KEY_ENCRYPT", "SADB_EXT_IDENTITY_SRC", "SADB_EXT_IDENTITY_DST", "SADB_EXT_SENSITIVITY", "SADB_EXT_PROPOSAL", "SADB_EXT_SUPPORTED_AUTH", "SADB_EXT_SUPPORTED_ENCRYPT", "SADB_EXT_SPIRANGE", "SADB_X_EXT_KMPRIVATE", "SADB_X_EXT_POLICY", "SADB_X_EXT_SA2", #ifdef __APPLE__ "SADB_EXT_SESSION_ID", "SADB_EXT_SASTAT", "SADB_X_EXT_IPSECIF", "SADB_X_EXT_ADDR_RANGE_SRC_START", "SADB_X_EXT_ADDR_RANGE_SRC_END", "SADB_X_EXT_ADDR_RANGE_DST_START", "SADB_X_EXT_ADDR_RANGE_DST_END", "SADB_EXT_MIGRATE_ADDRESS_SRC", "SADB_EXT_MIGRATE_ADDRESS_DST", "SADB_X_EXT_MIGRATE_IPSECIF", #else "SADB_X_EXT_NAT_T_TYPE", "SADB_X_EXT_NAT_T_SPORT", "SADB_X_EXT_NAT_T_DPORT", #ifdef __linux__ "SADB_X_EXT_NAT_T_OA", "SADB_X_EXT_SEC_CTX", "SADB_X_EXT_KMADDRESS", #else "SADB_X_EXT_NAT_T_OAI", "SADB_X_EXT_NAT_T_OAR", "SADB_X_EXT_NAT_T_FRAG", "SADB_X_EXT_SA_REPLAY", "SADB_X_EXT_NEW_ADDRESS_SRC", "SADB_X_EXT_NEW_ADDRESS_DST", #endif /* __linux__ */ #endif /* __APPLE__ */ ); /** * convert a protocol identifier to the PF_KEY sa type */ static uint8_t proto2satype(uint8_t proto) { switch (proto) { case IPPROTO_ESP: return SADB_SATYPE_ESP; case IPPROTO_AH: return SADB_SATYPE_AH; case IPPROTO_COMP: return SADB_X_SATYPE_IPCOMP; default: return proto; } } /** * convert a PF_KEY sa type to a protocol identifier */ static uint8_t satype2proto(uint8_t satype) { switch (satype) { case SADB_SATYPE_ESP: return IPPROTO_ESP; case SADB_SATYPE_AH: return IPPROTO_AH; case SADB_X_SATYPE_IPCOMP: return IPPROTO_COMP; default: return satype; } } /** * convert the general ipsec mode to the one defined in ipsec.h */ static uint8_t mode2kernel(ipsec_mode_t mode) { switch (mode) { case MODE_TRANSPORT: return IPSEC_MODE_TRANSPORT; case MODE_TUNNEL: return IPSEC_MODE_TUNNEL; #ifdef HAVE_IPSEC_MODE_BEET case MODE_BEET: return IPSEC_MODE_BEET; #endif default: return mode; } } /** * convert the general policy direction to the one defined in ipsec.h */ static uint8_t dir2kernel(policy_dir_t dir) { switch (dir) { case POLICY_IN: return IPSEC_DIR_INBOUND; case POLICY_OUT: return IPSEC_DIR_OUTBOUND; #ifdef HAVE_IPSEC_DIR_FWD case POLICY_FWD: return IPSEC_DIR_FWD; #endif default: return IPSEC_DIR_INVALID; } } /** * convert the policy type to the one defined in ipsec.h */ static inline uint16_t type2kernel(policy_type_t type) { switch (type) { case POLICY_IPSEC: return IPSEC_POLICY_IPSEC; case POLICY_PASS: return IPSEC_POLICY_NONE; case POLICY_DROP: return IPSEC_POLICY_DISCARD; } return type; } #ifdef SADB_X_MIGRATE /** * convert the policy direction in ipsec.h to the general one. */ static policy_dir_t kernel2dir(uint8_t dir) { switch (dir) { case IPSEC_DIR_INBOUND: return POLICY_IN; case IPSEC_DIR_OUTBOUND: return POLICY_OUT; #ifdef HAVE_IPSEC_DIR_FWD case IPSEC_DIR_FWD: return POLICY_FWD; #endif default: return dir; } } #endif /*SADB_X_MIGRATE*/ typedef struct kernel_algorithm_t kernel_algorithm_t; /** * Mapping of IKEv2 algorithms to PF_KEY algorithms */ struct kernel_algorithm_t { /** * Identifier specified in IKEv2 */ int ikev2; /** * Identifier as defined in pfkeyv2.h */ int kernel; }; #define END_OF_LIST -1 /** * Algorithms for encryption */ static kernel_algorithm_t encryption_algs[] = { /* {ENCR_DES_IV64, 0 }, */ {ENCR_DES, SADB_EALG_DESCBC }, {ENCR_3DES, SADB_EALG_3DESCBC }, /* {ENCR_RC5, 0 }, */ /* {ENCR_IDEA, 0 }, */ {ENCR_CAST, SADB_X_EALG_CASTCBC }, {ENCR_BLOWFISH, SADB_X_EALG_BLOWFISHCBC }, /* {ENCR_3IDEA, 0 }, */ /* {ENCR_DES_IV32, 0 }, */ {ENCR_NULL, SADB_EALG_NULL }, {ENCR_AES_CBC, SADB_X_EALG_AESCBC }, #ifdef SADB_X_EALG_AESCTR {ENCR_AES_CTR, SADB_X_EALG_AESCTR }, #endif /* {ENCR_AES_CCM_ICV8, SADB_X_EALG_AES_CCM_ICV8 }, */ /* {ENCR_AES_CCM_ICV12, SADB_X_EALG_AES_CCM_ICV12 }, */ /* {ENCR_AES_CCM_ICV16, SADB_X_EALG_AES_CCM_ICV16 }, */ #ifdef SADB_X_EALG_AES_GCM_ICV8 /* assume the others are defined too */ {ENCR_AES_GCM_ICV8, SADB_X_EALG_AES_GCM_ICV8 }, {ENCR_AES_GCM_ICV12, SADB_X_EALG_AES_GCM_ICV12 }, {ENCR_AES_GCM_ICV16, SADB_X_EALG_AES_GCM_ICV16 }, #elif defined(SADB_X_EALG_AES_GCM) /* macOS */ {ENCR_AES_GCM_ICV16, SADB_X_EALG_AES_GCM }, #endif #ifdef SADB_X_EALG_CAMELLIACBC {ENCR_CAMELLIA_CBC, SADB_X_EALG_CAMELLIACBC }, #endif #ifdef SADB_X_EALG_CHACHA20POLY1305 {ENCR_CHACHA20_POLY1305, SADB_X_EALG_CHACHA20POLY1305}, #endif {END_OF_LIST, 0 }, }; /** * Algorithms for integrity protection */ static kernel_algorithm_t integrity_algs[] = { {AUTH_HMAC_MD5_96, SADB_AALG_MD5HMAC }, {AUTH_HMAC_SHA1_96, SADB_AALG_SHA1HMAC }, {AUTH_HMAC_SHA2_256_128, SADB_X_AALG_SHA2_256HMAC }, {AUTH_HMAC_SHA2_384_192, SADB_X_AALG_SHA2_384HMAC }, {AUTH_HMAC_SHA2_512_256, SADB_X_AALG_SHA2_512HMAC }, /* {AUTH_DES_MAC, 0, }, */ /* {AUTH_KPDK_MD5, 0, }, */ #ifdef SADB_X_AALG_AES_XCBC_MAC {AUTH_AES_XCBC_96, SADB_X_AALG_AES_XCBC_MAC, }, #endif {END_OF_LIST, 0, }, }; /** * Algorithms for IPComp, unused yet */ static kernel_algorithm_t compression_algs[] = { /* {IPCOMP_OUI, 0 }, */ {IPCOMP_DEFLATE, SADB_X_CALG_DEFLATE }, #ifdef SADB_X_CALG_LZS {IPCOMP_LZS, SADB_X_CALG_LZS }, #endif #ifdef SADB_X_CALG_LZJH {IPCOMP_LZJH, SADB_X_CALG_LZJH }, #endif {END_OF_LIST, 0 }, }; /** * Look up a kernel algorithm ID and its key size */ static int lookup_algorithm(transform_type_t type, int ikev2) { kernel_algorithm_t *list; uint16_t alg = 0; switch (type) { case ENCRYPTION_ALGORITHM: list = encryption_algs; break; case INTEGRITY_ALGORITHM: list = integrity_algs; break; case COMPRESSION_ALGORITHM: list = compression_algs; break; default: return 0; } while (list->ikev2 != END_OF_LIST) { if (ikev2 == list->ikev2) { return list->kernel; } list++; } charon->kernel->lookup_algorithm(charon->kernel, ikev2, type, &alg, NULL); return alg; } /** * Helper to set a port in a sockaddr_t, the port has to be in host order */ static void set_port(sockaddr_t *addr, uint16_t port) { switch (addr->sa_family) { case AF_INET: { struct sockaddr_in *sin = (struct sockaddr_in*)addr; sin->sin_port = htons(port); break; } case AF_INET6: { struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)addr; sin6->sin6_port = htons(port); break; } } } /** * Copy a host_t as sockaddr_t to the given memory location. * @return the number of bytes copied */ static size_t hostcpy(void *dest, host_t *host, bool include_port) { sockaddr_t *addr = host->get_sockaddr(host), *dest_addr = dest; socklen_t *len = host->get_sockaddr_len(host); memcpy(dest, addr, *len); #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN dest_addr->sa_len = *len; #endif if (!include_port) { set_port(dest_addr, 0); } return *len; } /** * add a host to the given sadb_msg */ static void add_addr_ext(struct sadb_msg *msg, host_t *host, uint16_t type, uint8_t proto, uint8_t prefixlen, bool include_port) { struct sadb_address *addr = (struct sadb_address*)PFKEY_EXT_ADD_NEXT(msg); size_t len; addr->sadb_address_exttype = type; addr->sadb_address_proto = proto; addr->sadb_address_prefixlen = prefixlen; len = hostcpy(addr + 1, host, include_port); addr->sadb_address_len = PFKEY_LEN(sizeof(*addr) + len); PFKEY_EXT_ADD(msg, addr); } #ifdef HAVE_NATT /** * add udp encap extensions to a sadb_msg */ static void add_encap_ext(struct sadb_msg *msg, host_t *src, host_t *dst) { struct sadb_x_nat_t_type* nat_type; struct sadb_x_nat_t_port* nat_port; nat_type = (struct sadb_x_nat_t_type*)PFKEY_EXT_ADD_NEXT(msg); nat_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; nat_type->sadb_x_nat_t_type_len = PFKEY_LEN(sizeof(*nat_type)); nat_type->sadb_x_nat_t_type_type = UDP_ENCAP_ESPINUDP; PFKEY_EXT_ADD(msg, nat_type); nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg); nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port)); nat_port->sadb_x_nat_t_port_port = htons(src->get_port(src)); PFKEY_EXT_ADD(msg, nat_port); nat_port = (struct sadb_x_nat_t_port*)PFKEY_EXT_ADD_NEXT(msg); nat_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; nat_port->sadb_x_nat_t_port_len = PFKEY_LEN(sizeof(*nat_port)); nat_port->sadb_x_nat_t_port_port = htons(dst->get_port(dst)); PFKEY_EXT_ADD(msg, nat_port); } #endif /*HAVE_NATT*/ /** * Convert a sadb_address to a traffic_selector */ static traffic_selector_t* sadb_address2ts(struct sadb_address *address) { traffic_selector_t *ts; host_t *host; uint8_t proto; proto = address->sadb_address_proto; proto = proto == IPSEC_PROTO_ANY ? 0 : proto; /* The Linux 2.6 kernel does not set the protocol and port information * in the src and dst sadb_address extensions of the SADB_ACQUIRE message. */ host = host_create_from_sockaddr((sockaddr_t*)&address[1]); ts = traffic_selector_create_from_subnet(host, address->sadb_address_prefixlen, proto, host->get_port(host), host->get_port(host) ?: 65535); return ts; } /** * Parses a pfkey message received from the kernel */ static status_t parse_pfkey_message(struct sadb_msg *msg, pfkey_msg_t *out) { struct sadb_ext* ext; size_t len; memset(out, 0, sizeof(pfkey_msg_t)); out->msg = msg; len = msg->sadb_msg_len; len -= PFKEY_LEN(sizeof(struct sadb_msg)); ext = (struct sadb_ext*)(((char*)msg) + sizeof(struct sadb_msg)); while (len >= PFKEY_LEN(sizeof(struct sadb_ext))) { DBG3(DBG_KNL, " %N", sadb_ext_type_names, ext->sadb_ext_type); if (ext->sadb_ext_len < PFKEY_LEN(sizeof(struct sadb_ext)) || ext->sadb_ext_len > len) { DBG1(DBG_KNL, "length of %N extension is invalid", sadb_ext_type_names, ext->sadb_ext_type); break; } if ((ext->sadb_ext_type > SADB_EXT_MAX) || (!ext->sadb_ext_type)) { DBG1(DBG_KNL, "type of PF_KEY extension (%d) is invalid", ext->sadb_ext_type); break; } if (out->ext[ext->sadb_ext_type]) { DBG1(DBG_KNL, "duplicate %N extension", sadb_ext_type_names, ext->sadb_ext_type); break; } out->ext[ext->sadb_ext_type] = ext; ext = PFKEY_EXT_NEXT_LEN(ext, len); } if (len) { DBG1(DBG_KNL, "PF_KEY message length is invalid"); return FAILED; } return SUCCESS; } /** * Send a message to a specific PF_KEY socket and handle the response. */ static status_t pfkey_send_socket(private_kernel_pfkey_ipsec_t *this, int socket, struct sadb_msg *in, struct sadb_msg **out, size_t *out_len) { unsigned char buf[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg; int in_len, len; this->mutex_pfkey->lock(this->mutex_pfkey); /* the kernel may broadcast messages not related to our requests (e.g. when * managing SAs and policies via an external tool), so let's clear the * receive buffer so there is room for our request and its reply. */ while (TRUE) { len = recv(socket, buf, sizeof(buf), MSG_DONTWAIT); if (len < 0) { if (errno == EINTR) { /* interrupted, try again */ continue; } break; } } /* FIXME: our usage of sequence numbers is probably wrong. check RFC 2367, * in particular the behavior in response to an SADB_ACQUIRE. */ in->sadb_msg_seq = ++this->seq; in->sadb_msg_pid = getpid(); in_len = PFKEY_USER_LEN(in->sadb_msg_len); while (TRUE) { len = send(socket, in, in_len, 0); if (len != in_len) { if (errno == EINTR) { /* interrupted, try again */ continue; } this->mutex_pfkey->unlock(this->mutex_pfkey); DBG1(DBG_KNL, "error sending to PF_KEY socket: %s", strerror(errno)); return FAILED; } break; } while (TRUE) { msg = (struct sadb_msg*)buf; len = recv(socket, buf, sizeof(buf), 0); if (len < 0) { if (errno == EINTR) { DBG1(DBG_KNL, "got interrupted"); /* interrupted, try again */ continue; } DBG1(DBG_KNL, "error reading from PF_KEY socket: %s", strerror(errno)); this->mutex_pfkey->unlock(this->mutex_pfkey); return FAILED; } if (len < sizeof(struct sadb_msg) || msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg))) { DBG1(DBG_KNL, "received corrupted PF_KEY message"); this->mutex_pfkey->unlock(this->mutex_pfkey); return FAILED; } if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT) { DBG1(DBG_KNL, "buffer was too small to receive the complete PF_KEY " "message"); this->mutex_pfkey->unlock(this->mutex_pfkey); return FAILED; } if (msg->sadb_msg_pid != in->sadb_msg_pid) { DBG2(DBG_KNL, "received PF_KEY message is not intended for us"); continue; } if (msg->sadb_msg_seq != this->seq) { DBG2(DBG_KNL, "received PF_KEY message with unexpected sequence " "number, was %d expected %d", msg->sadb_msg_seq, this->seq); if (msg->sadb_msg_seq == 0) { /* FreeBSD and Mac OS X do this for the response to * SADB_X_SPDGET (but not for the response to SADB_GET). * FreeBSD: 'key_spdget' in /usr/src/sys/netipsec/key.c. */ } else if (msg->sadb_msg_seq < this->seq) { continue; } else { this->mutex_pfkey->unlock(this->mutex_pfkey); return FAILED; } } if (msg->sadb_msg_type != in->sadb_msg_type) { DBG2(DBG_KNL, "received PF_KEY message of wrong type, " "was %d expected %d, ignoring", msg->sadb_msg_type, in->sadb_msg_type); } break; } *out_len = len; *out = (struct sadb_msg*)malloc(len); memcpy(*out, buf, len); this->mutex_pfkey->unlock(this->mutex_pfkey); return SUCCESS; } /** * Send a message to the default PF_KEY socket and handle the response. */ static status_t pfkey_send(private_kernel_pfkey_ipsec_t *this, struct sadb_msg *in, struct sadb_msg **out, size_t *out_len) { return pfkey_send_socket(this, this->socket, in, out, out_len); } /** * Process a SADB_ACQUIRE message from the kernel */ static void process_acquire(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg) { pfkey_msg_t response; uint32_t index, reqid = 0; traffic_selector_t *src_ts, *dst_ts; policy_entry_t *policy; policy_sa_t *sa; switch (msg->sadb_msg_satype) { case SADB_SATYPE_UNSPEC: case SADB_SATYPE_ESP: case SADB_SATYPE_AH: break; default: /* acquire for AH/ESP only */ return; } DBG2(DBG_KNL, "received an SADB_ACQUIRE"); if (parse_pfkey_message(msg, &response) != SUCCESS) { DBG1(DBG_KNL, "parsing SADB_ACQUIRE from kernel failed"); return; } if (response.x_sa2) { reqid = response.x_sa2->sadb_x_sa2_reqid; } else { index = response.x_policy->sadb_x_policy_id; this->mutex->lock(this->mutex); if (this->policies->find_first(this->policies, policy_entry_match_byindex, (void**)&policy, index) && policy->used_by->get_first(policy->used_by, (void**)&sa) == SUCCESS) { reqid = sa->sa->cfg.reqid; } else { DBG1(DBG_KNL, "received an SADB_ACQUIRE with policy id %d but no " "matching policy found", index); } this->mutex->unlock(this->mutex); } src_ts = sadb_address2ts(response.src); dst_ts = sadb_address2ts(response.dst); charon->kernel->acquire(charon->kernel, reqid, src_ts, dst_ts); } /** * Process a SADB_EXPIRE message from the kernel */ static void process_expire(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg) { pfkey_msg_t response; uint8_t protocol; uint32_t spi; host_t *dst; bool hard; DBG2(DBG_KNL, "received an SADB_EXPIRE"); if (parse_pfkey_message(msg, &response) != SUCCESS) { DBG1(DBG_KNL, "parsing SADB_EXPIRE from kernel failed"); return; } protocol = satype2proto(msg->sadb_msg_satype); spi = response.sa->sadb_sa_spi; hard = response.lft_hard != NULL; if (protocol == IPPROTO_ESP || protocol == IPPROTO_AH) { dst = host_create_from_sockaddr((sockaddr_t*)(response.dst + 1)); if (dst) { charon->kernel->expire(charon->kernel, protocol, spi, dst, hard); dst->destroy(dst); } } } #ifdef SADB_X_MIGRATE /** * Process a SADB_X_MIGRATE message from the kernel */ static void process_migrate(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg) { pfkey_msg_t response; traffic_selector_t *src_ts, *dst_ts; policy_dir_t dir; uint32_t reqid = 0; host_t *local = NULL, *remote = NULL; DBG2(DBG_KNL, "received an SADB_X_MIGRATE"); if (parse_pfkey_message(msg, &response) != SUCCESS) { DBG1(DBG_KNL, "parsing SADB_X_MIGRATE from kernel failed"); return; } src_ts = sadb_address2ts(response.src); dst_ts = sadb_address2ts(response.dst); dir = kernel2dir(response.x_policy->sadb_x_policy_dir); DBG2(DBG_KNL, " policy %R === %R %N, id %u", src_ts, dst_ts, policy_dir_names, dir); /* SADB_X_EXT_KMADDRESS is not present in unpatched kernels < 2.6.28 */ if (response.x_kmaddress) { sockaddr_t *local_addr, *remote_addr; uint32_t local_len; local_addr = (sockaddr_t*)&response.x_kmaddress[1]; local = host_create_from_sockaddr(local_addr); local_len = (local_addr->sa_family == AF_INET6)? sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in); remote_addr = (sockaddr_t*)((uint8_t*)local_addr + local_len); remote = host_create_from_sockaddr(remote_addr); DBG2(DBG_KNL, " kmaddress: %H...%H", local, remote); } if (src_ts && dst_ts && local && remote) { charon->kernel->migrate(charon->kernel, reqid, src_ts, dst_ts, dir, local, remote); } else { DESTROY_IF(src_ts); DESTROY_IF(dst_ts); DESTROY_IF(local); DESTROY_IF(remote); } } #endif /*SADB_X_MIGRATE*/ #ifdef SADB_X_NAT_T_NEW_MAPPING /** * Process a SADB_X_NAT_T_NEW_MAPPING message from the kernel */ static void process_mapping(private_kernel_pfkey_ipsec_t *this, struct sadb_msg* msg) { pfkey_msg_t response; uint32_t spi; sockaddr_t *sa; host_t *dst, *new; DBG2(DBG_KNL, "received an SADB_X_NAT_T_NEW_MAPPING"); if (parse_pfkey_message(msg, &response) != SUCCESS) { DBG1(DBG_KNL, "parsing SADB_X_NAT_T_NEW_MAPPING from kernel failed"); return; } if (!response.x_sa2) { DBG1(DBG_KNL, "received SADB_X_NAT_T_NEW_MAPPING is missing required " "information"); return; } spi = response.sa->sadb_sa_spi; if (satype2proto(msg->sadb_msg_satype) != IPPROTO_ESP) { return; } sa = (sockaddr_t*)(response.dst + 1); dst = host_create_from_sockaddr(sa); switch (sa->sa_family) { case AF_INET: { struct sockaddr_in *sin = (struct sockaddr_in*)sa; sin->sin_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port); break; } case AF_INET6: { struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa; sin6->sin6_port = htons(response.x_natt_dport->sadb_x_nat_t_port_port); break; } default: break; } if (dst) { new = host_create_from_sockaddr(sa); if (new) { charon->kernel->mapping(charon->kernel, IPPROTO_ESP, spi, dst, new); new->destroy(new); } dst->destroy(dst); } } #endif /*SADB_X_NAT_T_NEW_MAPPING*/ /** * Receives events from kernel */ static bool receive_events(private_kernel_pfkey_ipsec_t *this, int fd, watcher_event_t event) { unsigned char buf[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg = (struct sadb_msg*)buf; int len; len = recvfrom(this->socket_events, buf, sizeof(buf), MSG_DONTWAIT, NULL, 0); if (len < 0) { switch (errno) { case EINTR: /* interrupted, try again */ return TRUE; case EAGAIN: /* no data ready, select again */ return TRUE; default: DBG1(DBG_KNL, "unable to receive from PF_KEY event socket"); sleep(1); return TRUE; } } if (len < sizeof(struct sadb_msg) || msg->sadb_msg_len < PFKEY_LEN(sizeof(struct sadb_msg))) { DBG2(DBG_KNL, "received corrupted PF_KEY message"); return TRUE; } if (msg->sadb_msg_pid != 0) { /* not from kernel. not interested, try another one */ return TRUE; } if (msg->sadb_msg_len > len / PFKEY_ALIGNMENT) { DBG1(DBG_KNL, "buffer was too small to receive the complete " "PF_KEY message"); return TRUE; } switch (msg->sadb_msg_type) { case SADB_ACQUIRE: process_acquire(this, msg); break; case SADB_EXPIRE: process_expire(this, msg); break; #ifdef SADB_X_MIGRATE case SADB_X_MIGRATE: process_migrate(this, msg); break; #endif /*SADB_X_MIGRATE*/ #ifdef SADB_X_NAT_T_NEW_MAPPING case SADB_X_NAT_T_NEW_MAPPING: process_mapping(this, msg); break; #endif /*SADB_X_NAT_T_NEW_MAPPING*/ default: break; } return TRUE; } /** * Get an SPI for a specific protocol from the kernel. */ static status_t get_spi_internal(private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, uint8_t proto, uint32_t min, uint32_t max, uint32_t *spi) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; struct sadb_spirange *range; pfkey_msg_t response; uint32_t received_spi = 0; size_t len; memset(&request, 0, sizeof(request)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_GETSPI; msg->sadb_msg_satype = proto2satype(proto); msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); add_addr_ext(msg, src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE); add_addr_ext(msg, dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE); range = (struct sadb_spirange*)PFKEY_EXT_ADD_NEXT(msg); range->sadb_spirange_exttype = SADB_EXT_SPIRANGE; range->sadb_spirange_len = PFKEY_LEN(sizeof(struct sadb_spirange)); range->sadb_spirange_min = min; range->sadb_spirange_max = max; PFKEY_EXT_ADD(msg, range); if (pfkey_send(this, msg, &out, &len) == SUCCESS) { if (out->sadb_msg_errno) { DBG1(DBG_KNL, "allocating SPI failed: %s (%d)", strerror(out->sadb_msg_errno), out->sadb_msg_errno); } else if (parse_pfkey_message(out, &response) == SUCCESS) { received_spi = response.sa->sadb_sa_spi; } free(out); } if (received_spi == 0) { return FAILED; } *spi = received_spi; return SUCCESS; } METHOD(kernel_ipsec_t, get_spi, status_t, private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, uint8_t protocol, uint32_t *spi) { uint32_t spi_min, spi_max; spi_min = lib->settings->get_int(lib->settings, "%s.spi_min", KERNEL_SPI_MIN, lib->ns); spi_max = lib->settings->get_int(lib->settings, "%s.spi_max", KERNEL_SPI_MAX, lib->ns); if (get_spi_internal(this, src, dst, protocol, min(spi_min, spi_max), max(spi_min, spi_max), spi) != SUCCESS) { DBG1(DBG_KNL, "unable to get SPI"); return FAILED; } DBG2(DBG_KNL, "got SPI %.8x", ntohl(*spi)); return SUCCESS; } METHOD(kernel_ipsec_t, get_cpi, status_t, private_kernel_pfkey_ipsec_t *this, host_t *src, host_t *dst, uint16_t *cpi) { uint32_t received_spi = 0; DBG2(DBG_KNL, "getting CPI"); if (get_spi_internal(this, src, dst, IPPROTO_COMP, 0x100, 0xEFFF, &received_spi) != SUCCESS) { DBG1(DBG_KNL, "unable to get CPI"); return FAILED; } *cpi = htons((uint16_t)ntohl(received_spi)); DBG2(DBG_KNL, "got CPI %.4x", ntohs(*cpi)); return SUCCESS; } METHOD(kernel_ipsec_t, add_sa, status_t, private_kernel_pfkey_ipsec_t *this, kernel_ipsec_sa_id_t *id, kernel_ipsec_add_sa_t *data) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; struct sadb_sa *sa; struct sadb_x_sa2 *sa2; struct sadb_lifetime *lft; struct sadb_key *key; size_t len; uint16_t ipcomp = data->ipcomp; ipsec_mode_t mode = data->mode; /* 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 && data->cpi != 0) { lifetime_cfg_t lft = {{0,0,0},{0,0,0},{0,0,0}}; kernel_ipsec_sa_id_t ipcomp_id = { .src = id->src, .dst = id->dst, .spi = htonl(ntohs(data->cpi)), .proto = IPPROTO_COMP, .mark = id->mark, }; kernel_ipsec_add_sa_t ipcomp_sa = { .reqid = data->reqid, .mode = data->mode, .src_ts = data->src_ts, .dst_ts = data->dst_ts, .lifetime = &lft, .enc_alg = ENCR_UNDEFINED, .int_alg = AUTH_UNDEFINED, .tfc = data->tfc, .ipcomp = data->ipcomp, .initiator = data->initiator, .inbound = data->inbound, .update = data->update, }; add_sa(this, &ipcomp_id, &ipcomp_sa); ipcomp = IPCOMP_NONE; /* use transport mode ESP SA, IPComp uses tunnel mode */ mode = MODE_TRANSPORT; } if (data->update) { /* As we didn't know the reqid during SPI allocation, we used reqid * zero. Unfortunately we can't SADB_UPDATE to the new reqid, hence we * have to delete the SPI allocation state manually. The reqid * selector does not count for that, therefore we have to delete * that state before installing the new SA to avoid deleting the * the new state after installing it. */ kernel_ipsec_sa_id_t del_id = { .src = id->src, .dst = id->dst, .spi = id->spi, .proto = id->proto, }; kernel_ipsec_del_sa_t del = { 0 }; if (this->public.interface.del_sa(&this->public.interface, &del_id, &del) != SUCCESS) { DBG1(DBG_KNL, "deleting SPI allocation SA failed"); } } memset(&request, 0, sizeof(request)); DBG2(DBG_KNL, "adding SAD entry with SPI %.8x and reqid {%u}", ntohl(id->spi), data->reqid); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_ADD; msg->sadb_msg_satype = proto2satype(id->proto); msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); #ifdef __APPLE__ if (data->encap) { struct sadb_sa_2 *sa_2; sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg); sa_2->sadb_sa_natt_port = id->dst->get_port(id->dst); sa = &sa_2->sa; sa->sadb_sa_flags |= SADB_X_EXT_NATT; len = sizeof(struct sadb_sa_2); } else #endif { sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg); len = sizeof(struct sadb_sa); } sa->sadb_sa_exttype = SADB_EXT_SA; sa->sadb_sa_len = PFKEY_LEN(len); sa->sadb_sa_spi = id->spi; sa->sadb_sa_state = SADB_SASTATE_MATURE; if (id->proto == IPPROTO_COMP) { sa->sadb_sa_encrypt = lookup_algorithm(COMPRESSION_ALGORITHM, ipcomp); } else { /* Linux interprets sadb_sa_replay as number of packets/bits in the * replay window, whereas on BSD it's the size of the window in bytes. * Only set for the inbound SA as it's not relevant for the outbound * SA and might waste memory with large windows. */ if (data->inbound) { #ifdef __linux__ sa->sadb_sa_replay = min(data->replay_window, 32); #else sa->sadb_sa_replay = min((data->replay_window + 7) / 8, UINT8_MAX); #endif } if (data->esn) { #ifdef SADB_X_SAFLAGS_ESN DBG2(DBG_KNL, " using extended sequence numbers (ESN)"); sa->sadb_sa_flags |= SADB_X_SAFLAGS_ESN; #else DBG1(DBG_KNL, "extended sequence numbers (ESN) not supported by " "kernel!"); return FAILED; #endif } sa->sadb_sa_auth = lookup_algorithm(INTEGRITY_ALGORITHM, data->int_alg); sa->sadb_sa_encrypt = lookup_algorithm(ENCRYPTION_ALGORITHM, data->enc_alg); } PFKEY_EXT_ADD(msg, sa); #ifdef SADB_X_EXT_SA_REPLAY if (data->inbound) { struct sadb_x_sa_replay *repl; repl = (struct sadb_x_sa_replay*)PFKEY_EXT_ADD_NEXT(msg); repl->sadb_x_sa_replay_exttype = SADB_X_EXT_SA_REPLAY; repl->sadb_x_sa_replay_len = PFKEY_LEN(sizeof(struct sadb_x_sa_replay)); repl->sadb_x_sa_replay_replay = min(data->replay_window, UINT32_MAX-32); PFKEY_EXT_ADD(msg, repl); } #endif sa2 = (struct sadb_x_sa2*)PFKEY_EXT_ADD_NEXT(msg); sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; sa2->sadb_x_sa2_len = PFKEY_LEN(sizeof(struct sadb_spirange)); sa2->sadb_x_sa2_mode = mode2kernel(mode); sa2->sadb_x_sa2_reqid = data->reqid; PFKEY_EXT_ADD(msg, sa2); add_addr_ext(msg, id->src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE); add_addr_ext(msg, id->dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE); lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg); lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime)); lft->sadb_lifetime_allocations = data->lifetime->packets.rekey; lft->sadb_lifetime_bytes = data->lifetime->bytes.rekey; lft->sadb_lifetime_addtime = data->lifetime->time.rekey; lft->sadb_lifetime_usetime = 0; /* we only use addtime */ PFKEY_EXT_ADD(msg, lft); lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg); lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime)); lft->sadb_lifetime_allocations = data->lifetime->packets.life; lft->sadb_lifetime_bytes = data->lifetime->bytes.life; lft->sadb_lifetime_addtime = data->lifetime->time.life; lft->sadb_lifetime_usetime = 0; /* we only use addtime */ PFKEY_EXT_ADD(msg, lft); if (data->enc_alg != ENCR_UNDEFINED) { if (!sa->sadb_sa_encrypt) { DBG1(DBG_KNL, "algorithm %N not supported by kernel!", encryption_algorithm_names, data->enc_alg); return FAILED; } DBG2(DBG_KNL, " using encryption algorithm %N with key size %d", encryption_algorithm_names, data->enc_alg, data->enc_key.len * 8); key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg); key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; key->sadb_key_bits = data->enc_key.len * 8; key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + data->enc_key.len); memcpy(key + 1, data->enc_key.ptr, data->enc_key.len); PFKEY_EXT_ADD(msg, key); } if (data->int_alg != AUTH_UNDEFINED) { if (!sa->sadb_sa_auth) { DBG1(DBG_KNL, "algorithm %N not supported by kernel!", integrity_algorithm_names, data->int_alg); return FAILED; } DBG2(DBG_KNL, " using integrity algorithm %N with key size %d", integrity_algorithm_names, data->int_alg, data->int_key.len * 8); key = (struct sadb_key*)PFKEY_EXT_ADD_NEXT(msg); key->sadb_key_exttype = SADB_EXT_KEY_AUTH; key->sadb_key_bits = data->int_key.len * 8; key->sadb_key_len = PFKEY_LEN(sizeof(struct sadb_key) + data->int_key.len); memcpy(key + 1, data->int_key.ptr, data->int_key.len); PFKEY_EXT_ADD(msg, key); } #ifdef HAVE_NATT if (data->encap) { add_encap_ext(msg, id->src, id->dst); } #endif /*HAVE_NATT*/ if (pfkey_send(this, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x", ntohl(id->spi)); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to add SAD entry with SPI %.8x: %s (%d)", ntohl(id->spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } free(out); return SUCCESS; } METHOD(kernel_ipsec_t, update_sa, status_t, private_kernel_pfkey_ipsec_t *this, kernel_ipsec_sa_id_t *id, kernel_ipsec_update_sa_t *data) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; struct sadb_sa *sa; pfkey_msg_t response; size_t len; #ifndef SADB_X_EXT_NEW_ADDRESS_SRC /* we can't update the SA if any of the ip addresses have changed. * that's because we can't use SADB_UPDATE and by deleting and readding the * SA the sequence numbers would get lost */ if (!id->src->ip_equals(id->src, data->new_src) || !id->dst->ip_equals(id->dst, data->new_dst)) { DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: address " "changes are not supported", ntohl(id->spi)); return NOT_SUPPORTED; } #endif /*SADB_X_EXT_NEW_ADDRESS_SRC*/ /* if IPComp is used, we first update the IPComp SA */ if (data->cpi) { kernel_ipsec_sa_id_t ipcomp_id = { .src = id->src, .dst = id->dst, .spi = htonl(ntohs(data->cpi)), .proto = IPPROTO_COMP, .mark = id->mark, }; kernel_ipsec_update_sa_t ipcomp = { .new_src = data->new_src, .new_dst = data->new_dst, }; update_sa(this, &ipcomp_id, &ipcomp); } memset(&request, 0, sizeof(request)); DBG2(DBG_KNL, "querying SAD entry with SPI %.8x for update", ntohl(id->spi)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_GET; msg->sadb_msg_satype = proto2satype(id->proto); msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg); sa->sadb_sa_exttype = SADB_EXT_SA; sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa)); sa->sadb_sa_spi = id->spi; sa->sadb_sa_state = SADB_SASTATE_MATURE; PFKEY_EXT_ADD(msg, sa); add_addr_ext(msg, id->src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE); add_addr_ext(msg, id->dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE); if (pfkey_send(this, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(id->spi)); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)", ntohl(id->spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } else if (parse_pfkey_message(out, &response) != SUCCESS) { DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: parsing " "response from kernel failed", ntohl(id->spi)); free(out); return FAILED; } DBG2(DBG_KNL, "updating SAD entry with SPI %.8x from %#H..%#H to %#H..%#H", ntohl(id->spi), id->src, id->dst, data->new_src, data->new_dst); memset(&request, 0, sizeof(request)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_UPDATE; msg->sadb_msg_satype = proto2satype(id->proto); msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); #ifdef __APPLE__ { struct sadb_sa_2 *sa_2; sa_2 = (struct sadb_sa_2*)PFKEY_EXT_ADD_NEXT(msg); sa_2->sa.sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa_2)); memcpy(&sa_2->sa, response.sa, sizeof(struct sadb_sa)); if (data->new_encap) { sa_2->sadb_sa_natt_port = data->new_dst->get_port(data->new_dst); sa_2->sa.sadb_sa_flags |= SADB_X_EXT_NATT; } } #else PFKEY_EXT_COPY(msg, response.sa); #endif PFKEY_EXT_COPY(msg, response.x_sa2); PFKEY_EXT_COPY(msg, response.src); PFKEY_EXT_COPY(msg, response.dst); PFKEY_EXT_COPY(msg, response.lft_soft); PFKEY_EXT_COPY(msg, response.lft_hard); #ifndef __FreeBSD__ /* FreeBSD 11.1 does not allow key updates via SADB_UPDATE for mature SAs */ if (response.key_encr) { PFKEY_EXT_COPY(msg, response.key_encr); } if (response.key_auth) { PFKEY_EXT_COPY(msg, response.key_auth); } #endif #ifdef HAVE_NATT if (data->new_encap) { add_encap_ext(msg, data->new_src, data->new_dst); } #endif /*HAVE_NATT*/ #ifdef SADB_X_EXT_NEW_ADDRESS_SRC if (!id->src->ip_equals(id->src, data->new_src)) { add_addr_ext(msg, data->new_src, SADB_X_EXT_NEW_ADDRESS_SRC, 0, 0, FALSE); } if (!id->dst->ip_equals(id->dst, data->new_dst)) { add_addr_ext(msg, data->new_dst, SADB_X_EXT_NEW_ADDRESS_DST, 0, 0, FALSE); } #endif /*SADB_X_EXT_NEW_ADDRESS_SRC*/ free(out); if (pfkey_send(this, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x", ntohl(id->spi)); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to update SAD entry with SPI %.8x: %s (%d)", ntohl(id->spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } free(out); return SUCCESS; } METHOD(kernel_ipsec_t, query_sa, status_t, private_kernel_pfkey_ipsec_t *this, kernel_ipsec_sa_id_t *id, kernel_ipsec_query_sa_t *data, uint64_t *bytes, uint64_t *packets, time_t *time) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; struct sadb_sa *sa; pfkey_msg_t response; size_t len; memset(&request, 0, sizeof(request)); DBG2(DBG_KNL, "querying SAD entry with SPI %.8x", ntohl(id->spi)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_GET; msg->sadb_msg_satype = proto2satype(id->proto); msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg); sa->sadb_sa_exttype = SADB_EXT_SA; sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa)); sa->sadb_sa_spi = id->spi; PFKEY_EXT_ADD(msg, sa); /* the Linux Kernel doesn't care for the src address, but other systems do * (e.g. FreeBSD) */ add_addr_ext(msg, id->src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE); add_addr_ext(msg, id->dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE); if (pfkey_send(this, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(id->spi)); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x: %s (%d)", ntohl(id->spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } else if (parse_pfkey_message(out, &response) != SUCCESS) { DBG1(DBG_KNL, "unable to query SAD entry with SPI %.8x", ntohl(id->spi)); free(out); return FAILED; } if (bytes) { *bytes = response.lft_current->sadb_lifetime_bytes; } if (packets) { /* at least on Linux and FreeBSD this contains the number of packets */ *packets = response.lft_current->sadb_lifetime_allocations; } if (time) { #ifdef __APPLE__ /* OS X uses the "last" time of use in usetime */ *time = response.lft_current->sadb_lifetime_usetime; #else /* !__APPLE__ */ /* on Linux, sadb_lifetime_usetime is set to the "first" time of use, * which is actually correct according to PF_KEY. We have to query * policies for the last usetime. */ *time = 0; #endif /* !__APPLE__ */ } free(out); return SUCCESS; } METHOD(kernel_ipsec_t, del_sa, status_t, private_kernel_pfkey_ipsec_t *this, kernel_ipsec_sa_id_t *id, kernel_ipsec_del_sa_t *data) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; struct sadb_sa *sa; size_t len; /* if IPComp was used, we first delete the additional IPComp SA */ if (data->cpi) { kernel_ipsec_sa_id_t ipcomp_id = { .src = id->src, .dst = id->dst, .spi = htonl(ntohs(data->cpi)), .proto = IPPROTO_COMP, .mark = id->mark, }; kernel_ipsec_del_sa_t ipcomp = { 0 }; del_sa(this, &ipcomp_id, &ipcomp); } memset(&request, 0, sizeof(request)); DBG2(DBG_KNL, "deleting SAD entry with SPI %.8x", ntohl(id->spi)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_DELETE; msg->sadb_msg_satype = proto2satype(id->proto); msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); sa = (struct sadb_sa*)PFKEY_EXT_ADD_NEXT(msg); sa->sadb_sa_exttype = SADB_EXT_SA; sa->sadb_sa_len = PFKEY_LEN(sizeof(struct sadb_sa)); sa->sadb_sa_spi = id->spi; PFKEY_EXT_ADD(msg, sa); /* the Linux Kernel doesn't care for the src address, but other systems do * (e.g. FreeBSD) */ add_addr_ext(msg, id->src, SADB_EXT_ADDRESS_SRC, 0, 0, FALSE); add_addr_ext(msg, id->dst, SADB_EXT_ADDRESS_DST, 0, 0, FALSE); if (pfkey_send(this, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x", ntohl(id->spi)); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to delete SAD entry with SPI %.8x: %s (%d)", ntohl(id->spi), strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } DBG2(DBG_KNL, "deleted SAD entry with SPI %.8x", ntohl(id->spi)); free(out); return SUCCESS; } METHOD(kernel_ipsec_t, flush_sas, status_t, private_kernel_pfkey_ipsec_t *this) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; struct { uint8_t proto; char *name; } protos[] = { { SADB_SATYPE_AH, "AH" }, { SADB_SATYPE_ESP, "ESP" }, { SADB_X_SATYPE_IPCOMP, "IPComp" }, }; size_t len; int i; memset(&request, 0, sizeof(request)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_FLUSH; msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); for (i = 0; i < countof(protos); i++) { DBG2(DBG_KNL, "flushing all %s SAD entries", protos[i].name); msg->sadb_msg_satype = protos[i].proto; if (pfkey_send(this, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to flush %s SAD entries", protos[i].name); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to flush %s SAD entries: %s (%d)", protos[i].name, strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } free(out); } return SUCCESS; } /** * Add an explicit exclude route to a routing entry */ static void add_exclude_route(private_kernel_pfkey_ipsec_t *this, route_entry_t *route, host_t *src, host_t *dst) { enumerator_t *enumerator; exclude_route_t *exclude; host_t *gtw; enumerator = this->excludes->create_enumerator(this->excludes); while (enumerator->enumerate(enumerator, &exclude)) { if (dst->ip_equals(dst, exclude->dst)) { route->exclude = exclude; exclude->refs++; } } enumerator->destroy(enumerator); if (!route->exclude) { DBG2(DBG_KNL, "installing new exclude route for %H src %H", dst, src); gtw = charon->kernel->get_nexthop(charon->kernel, dst, -1, NULL, NULL); if (gtw) { char *if_name = NULL; if (charon->kernel->get_interface(charon->kernel, src, &if_name) && charon->kernel->add_route(charon->kernel, dst->get_address(dst), dst->get_family(dst) == AF_INET ? 32 : 128, gtw, src, if_name, FALSE) == SUCCESS) { INIT(exclude, .dst = dst->clone(dst), .src = src->clone(src), .gtw = gtw->clone(gtw), .refs = 1, ); route->exclude = exclude; this->excludes->insert_last(this->excludes, exclude); } else { DBG1(DBG_KNL, "installing exclude route for %H failed", dst); } gtw->destroy(gtw); free(if_name); } else { DBG1(DBG_KNL, "gateway lookup for for %H failed", dst); } } } /** * Remove an exclude route attached to a routing entry */ static void remove_exclude_route(private_kernel_pfkey_ipsec_t *this, route_entry_t *route) { if (route->exclude) { enumerator_t *enumerator; exclude_route_t *exclude; bool removed = FALSE; host_t *dst; enumerator = this->excludes->create_enumerator(this->excludes); while (enumerator->enumerate(enumerator, &exclude)) { if (route->exclude == exclude) { if (--exclude->refs == 0) { this->excludes->remove_at(this->excludes, enumerator); removed = TRUE; break; } } } enumerator->destroy(enumerator); if (removed) { char *if_name = NULL; dst = route->exclude->dst; DBG2(DBG_KNL, "uninstalling exclude route for %H src %H", dst, route->exclude->src); if (charon->kernel->get_interface( charon->kernel, route->exclude->src, &if_name) && charon->kernel->del_route(charon->kernel, dst->get_address(dst), dst->get_family(dst) == AF_INET ? 32 : 128, route->exclude->gtw, route->exclude->src, if_name, FALSE) != SUCCESS) { DBG1(DBG_KNL, "uninstalling exclude route for %H failed", dst); } exclude_route_destroy(route->exclude); free(if_name); } route->exclude = NULL; } } /** * Try to install a route to the given outbound policy */ static bool install_route(private_kernel_pfkey_ipsec_t *this, policy_entry_t *policy, policy_sa_out_t *out) { route_entry_t *route, *old; host_t *host, *src, *dst; bool is_virtual; if (charon->kernel->get_address_by_ts(charon->kernel, out->src_ts, &host, &is_virtual) != SUCCESS) { return FALSE; } INIT(route, .prefixlen = policy->dst.mask, .src_ip = host, .dst_net = chunk_clone(policy->dst.net->get_address(policy->dst.net)), ); src = out->generic.sa->src; dst = out->generic.sa->dst; if (!dst->is_anyaddr(dst)) { route->gateway = charon->kernel->get_nexthop(charon->kernel, dst, -1, src, &route->if_name); /* if the IP is virtual, we install the route over the interface it has * been installed on. Otherwise we use the interface we use for IKE, as * this is required for example on Linux. */ if (is_virtual || this->route_via_internal) { free(route->if_name); route->if_name = NULL; src = route->src_ip; } } else { /* for shunt policies */ route->gateway = charon->kernel->get_nexthop(charon->kernel, policy->dst.net, policy->dst.mask, route->src_ip, &route->if_name); /* we don't have a source address, use the address we found */ src = route->src_ip; } /* get interface for route, using source address */ if (!route->if_name && !charon->kernel->get_interface(charon->kernel, src, &route->if_name)) { route_entry_destroy(route); return FALSE; } if (policy->route) { old = policy->route; if (route_entry_equals(old, route)) { /* such a route already exists */ route_entry_destroy(route); return TRUE; } /* uninstall previously installed route */ if (charon->kernel->del_route(charon->kernel, old->dst_net, old->prefixlen, old->gateway, old->src_ip, old->if_name, FALSE) != SUCCESS) { DBG1(DBG_KNL, "error uninstalling route installed with policy " "%R === %R %N", out->src_ts, out->dst_ts, policy_dir_names, policy->direction); } route_entry_destroy(old); policy->route = NULL; } /* if remote traffic selector covers the IKE peer, add an exclude route */ if (charon->kernel->get_features(charon->kernel) & KERNEL_REQUIRE_EXCLUDE_ROUTE) { if (out->dst_ts->is_host(out->dst_ts, dst)) { DBG1(DBG_KNL, "can't install route for %R === %R %N, conflicts " "with IKE traffic", out->src_ts, out->dst_ts, policy_dir_names, policy->direction); route_entry_destroy(route); return FALSE; } if (out->dst_ts->includes(out->dst_ts, dst)) { add_exclude_route(this, route, out->generic.sa->src, dst); } } DBG2(DBG_KNL, "installing route: %R via %H src %H dev %s", out->dst_ts, route->gateway, route->src_ip, route->if_name); switch (charon->kernel->add_route(charon->kernel, route->dst_net, route->prefixlen, route->gateway, route->src_ip, route->if_name, FALSE)) { case ALREADY_DONE: /* route exists, do not uninstall */ remove_exclude_route(this, route); route_entry_destroy(route); return TRUE; case SUCCESS: /* cache the installed route */ policy->route = route; return TRUE; default: DBG1(DBG_KNL, "installing route failed: %R via %H src %H dev %s", out->dst_ts, route->gateway, route->src_ip, route->if_name); remove_exclude_route(this, route); route_entry_destroy(route); return FALSE; } } /** * Check if any significant data has changed to warrant sending an update to * the kernel. */ static bool policy_update_required(policy_sa_t *current, policy_sa_t *updated) { if (current->type != updated->type #ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY || current->priority != updated->priority #endif ) { return TRUE; } if (current->type == POLICY_IPSEC) { ipsec_sa_cfg_t *cur = &current->sa->cfg, *upd = &updated->sa->cfg; /* we don't use ipsec_sa_cfg_equals() here as e.g. SPIs are not * relevant for this kernel interface, so we don't have to update the * policy during a rekeying */ if (cur->mode != upd->mode || cur->reqid != upd->reqid || cur->esp.use != upd->esp.use || cur->ah.use != upd->ah.use || cur->ipcomp.transform != upd->ipcomp.transform) { return TRUE; } if (cur->mode == MODE_TUNNEL && (!current->sa->src->ip_equals(current->sa->src, updated->sa->src) || !current->sa->dst->ip_equals(current->sa->dst, updated->sa->dst))) { return TRUE; } } return FALSE; } /** * Add or update a policy in the kernel. * * Note: The mutex has to be locked when entering this function. */ static status_t add_policy_internal(private_kernel_pfkey_ipsec_t *this, policy_entry_t *policy, policy_sa_t *mapping, bool update) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; struct sadb_x_policy *pol; struct sadb_x_ipsecrequest *req; ipsec_sa_t *ipsec = mapping->sa; pfkey_msg_t response; size_t len; ipsec_mode_t proto_mode; status_t status; memset(&request, 0, sizeof(request)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = update ? SADB_X_SPDUPDATE : SADB_X_SPDADD; msg->sadb_msg_satype = 0; msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg); pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy)); pol->sadb_x_policy_id = 0; pol->sadb_x_policy_dir = dir2kernel(policy->direction); pol->sadb_x_policy_type = type2kernel(mapping->type); #ifdef HAVE_STRUCT_SADB_X_POLICY_SADB_X_POLICY_PRIORITY pol->sadb_x_policy_priority = mapping->priority; #endif if (mapping->type == POLICY_IPSEC && ipsec->cfg.reqid) { /* one or more sadb_x_ipsecrequest extensions are added to the * sadb_x_policy extension */ proto_mode = ipsec->cfg.mode; req = (struct sadb_x_ipsecrequest*)(pol + 1); if (ipsec->cfg.ipcomp.transform != IPCOMP_NONE) { req->sadb_x_ipsecrequest_proto = IPPROTO_COMP; /* !!! the length here MUST be in octets instead of 64 bit words */ req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest); req->sadb_x_ipsecrequest_mode = mode2kernel(ipsec->cfg.mode); req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid; req->sadb_x_ipsecrequest_level = (policy->direction == POLICY_OUT) ? IPSEC_LEVEL_UNIQUE : IPSEC_LEVEL_USE; if (ipsec->cfg.mode == MODE_TUNNEL) { len = hostcpy(req + 1, ipsec->src, FALSE); req->sadb_x_ipsecrequest_len += len; len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE); req->sadb_x_ipsecrequest_len += len; /* use transport mode for other SAs */ proto_mode = MODE_TRANSPORT; } pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len); req = (struct sadb_x_ipsecrequest*)((char*)(req) + req->sadb_x_ipsecrequest_len); } req->sadb_x_ipsecrequest_proto = ipsec->cfg.esp.use ? IPPROTO_ESP : IPPROTO_AH; /* !!! the length here MUST be in octets instead of 64 bit words */ req->sadb_x_ipsecrequest_len = sizeof(struct sadb_x_ipsecrequest); req->sadb_x_ipsecrequest_mode = mode2kernel(proto_mode); req->sadb_x_ipsecrequest_reqid = ipsec->cfg.reqid; req->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; if (proto_mode == MODE_TUNNEL) { len = hostcpy(req + 1, ipsec->src, FALSE); req->sadb_x_ipsecrequest_len += len; len = hostcpy((char*)(req + 1) + len, ipsec->dst, FALSE); req->sadb_x_ipsecrequest_len += len; } pol->sadb_x_policy_len += PFKEY_LEN(req->sadb_x_ipsecrequest_len); } PFKEY_EXT_ADD(msg, pol); add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto, policy->src.mask, TRUE); add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto, policy->dst.mask, TRUE); #ifdef __FreeBSD__ { /* on FreeBSD a lifetime has to be defined to be able to later query * the current use time. */ struct sadb_lifetime *lft; lft = (struct sadb_lifetime*)PFKEY_EXT_ADD_NEXT(msg); lft->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; lft->sadb_lifetime_len = PFKEY_LEN(sizeof(struct sadb_lifetime)); lft->sadb_lifetime_addtime = LONG_MAX; PFKEY_EXT_ADD(msg, lft); } #endif this->mutex->unlock(this->mutex); status = pfkey_send(this, msg, &out, &len); if (status == SUCCESS && !update && out->sadb_msg_errno == EEXIST) { DBG1(DBG_KNL, "policy already exists, try to update it"); free(out); msg->sadb_msg_type = SADB_X_SPDUPDATE; status = pfkey_send(this, msg, &out, &len); } if (status != SUCCESS) { return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to %s policy: %s (%d)", update ? "update" : "add", strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } else if (parse_pfkey_message(out, &response) != SUCCESS) { DBG1(DBG_KNL, "unable to %s policy: parsing response from kernel " "failed", update ? "update" : "add"); free(out); return FAILED; } /* we try to find the policy again and update the kernel index */ this->mutex->lock(this->mutex); if (!this->policies->find_first(this->policies, NULL, (void**)&policy)) { DBG2(DBG_KNL, "unable to update index, the policy is already gone, " "ignoring"); this->mutex->unlock(this->mutex); free(out); return SUCCESS; } policy->index = response.x_policy->sadb_x_policy_id; free(out); /* install a route, if: * - this is an outbound policy (to just get one for each child) * - routing is not disabled via strongswan.conf * - the selector is not for a specific protocol/port * - we are in tunnel mode or install a bypass policy */ if (policy->direction == POLICY_OUT && this->install_routes && policy->src.proto == IPSEC_PROTO_ANY && !policy->src.net->get_port(policy->src.net) && !policy->dst.net->get_port(policy->dst.net)) { if (mapping->type == POLICY_PASS || (mapping->type == POLICY_IPSEC && ipsec->cfg.mode != MODE_TRANSPORT)) { install_route(this, policy, (policy_sa_out_t*)mapping); } } this->mutex->unlock(this->mutex); return SUCCESS; } METHOD(kernel_ipsec_t, add_policy, status_t, private_kernel_pfkey_ipsec_t *this, kernel_ipsec_policy_id_t *id, kernel_ipsec_manage_policy_t *data) { policy_entry_t *policy, *found = NULL; policy_sa_t *assigned_sa, *current_sa = NULL; enumerator_t *enumerator; bool update = TRUE; if (dir2kernel(id->dir) == IPSEC_DIR_INVALID) { /* FWD policies are not supported on all platforms */ return SUCCESS; } /* create a policy */ policy = create_policy_entry(id->src_ts, id->dst_ts, id->dir); /* find a matching policy */ this->mutex->lock(this->mutex); if (this->policies->find_first(this->policies, policy_entry_equals, (void**)&found, policy)) { /* use existing policy */ DBG2(DBG_KNL, "policy %R === %R %N already exists, increasing " "refcount", id->src_ts, id->dst_ts, policy_dir_names, id->dir); policy_entry_destroy(policy, this); policy = found; } else { /* use the new one, if we have no such policy */ this->policies->insert_first(this->policies, policy); policy->used_by = linked_list_create(); } /* cache the assigned IPsec SA */ assigned_sa = policy_sa_create(this, id->dir, data->type, data->src, data->dst, id->src_ts, id->dst_ts, data->sa); assigned_sa->auto_priority = get_priority(policy, data->prio); assigned_sa->priority = data->manual_prio ? data->manual_prio : assigned_sa->auto_priority; /* insert the SA according to its priority */ enumerator = policy->used_by->create_enumerator(policy->used_by); while (enumerator->enumerate(enumerator, (void**)&current_sa)) { if (current_sa->priority > assigned_sa->priority) { break; } if (current_sa->priority == assigned_sa->priority) { /* in case of equal manual prios order SAs by automatic priority */ if (current_sa->auto_priority > assigned_sa->auto_priority) { break; } /* prefer SAs with a reqid over those without */ if (current_sa->auto_priority == assigned_sa->auto_priority && (!current_sa->sa->cfg.reqid || assigned_sa->sa->cfg.reqid)) { break; } } update = FALSE; } policy->used_by->insert_before(policy->used_by, enumerator, assigned_sa); enumerator->destroy(enumerator); if (update && current_sa) { /* check if there are actually any relevant changes, if not, we don't * send an update to the kernel as e.g. FreeBSD doesn't do that * atomically, causing unnecessary traffic loss during rekeyings */ update = policy_update_required(current_sa, assigned_sa); } if (!update) { /* we don't update the policy if the priority is lower than that of the * currently installed one */ this->mutex->unlock(this->mutex); return SUCCESS; } DBG2(DBG_KNL, "%s policy %R === %R %N", found ? "updating" : "adding", id->src_ts, id->dst_ts, policy_dir_names, id->dir); if (add_policy_internal(this, policy, assigned_sa, found) != SUCCESS) { DBG1(DBG_KNL, "unable to %s policy %R === %R %N", found ? "update" : "add", id->src_ts, id->dst_ts, policy_dir_names, id->dir); return FAILED; } return SUCCESS; } METHOD(kernel_ipsec_t, query_policy, status_t, private_kernel_pfkey_ipsec_t *this, kernel_ipsec_policy_id_t *id, kernel_ipsec_query_policy_t *data, time_t *use_time) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; struct sadb_x_policy *pol; policy_entry_t *policy, *found = NULL; pfkey_msg_t response; size_t len; if (dir2kernel(id->dir) == IPSEC_DIR_INVALID) { /* FWD policies are not supported on all platforms */ return NOT_FOUND; } DBG2(DBG_KNL, "querying policy %R === %R %N", id->src_ts, id->dst_ts, policy_dir_names, id->dir); /* create a policy */ policy = create_policy_entry(id->src_ts, id->dst_ts, id->dir); /* find a matching policy */ this->mutex->lock(this->mutex); if (!this->policies->find_first(this->policies, policy_entry_equals, (void**)&found, policy)) { DBG1(DBG_KNL, "querying policy %R === %R %N failed, not found", id->src_ts, id->dst_ts, policy_dir_names, id->dir); policy_entry_destroy(policy, this); this->mutex->unlock(this->mutex); return NOT_FOUND; } policy_entry_destroy(policy, this); policy = found; memset(&request, 0, sizeof(request)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_X_SPDGET; msg->sadb_msg_satype = 0; msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg); pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; pol->sadb_x_policy_id = policy->index; pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy)); pol->sadb_x_policy_dir = dir2kernel(id->dir); pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; PFKEY_EXT_ADD(msg, pol); add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto, policy->src.mask, TRUE); add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto, policy->dst.mask, TRUE); this->mutex->unlock(this->mutex); if (pfkey_send(this, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to query policy %R === %R %N", id->src_ts, id->dst_ts, policy_dir_names, id->dir); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to query policy %R === %R %N: %s (%d)", id->src_ts, id->dst_ts, policy_dir_names, id->dir, strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } else if (parse_pfkey_message(out, &response) != SUCCESS) { DBG1(DBG_KNL, "unable to query policy %R === %R %N: parsing response " "from kernel failed", id->src_ts, id->dst_ts, policy_dir_names, id->dir); free(out); return FAILED; } else if (response.lft_current == NULL) { DBG2(DBG_KNL, "unable to query policy %R === %R %N: kernel reports no " "use time", id->src_ts, id->dst_ts, policy_dir_names, id->dir); free(out); return FAILED; } /* we need the monotonic time, but the kernel returns system time. */ if (response.lft_current->sadb_lifetime_usetime) { *use_time = time_monotonic(NULL) - (time(NULL) - response.lft_current->sadb_lifetime_usetime); } else { *use_time = 0; } free(out); return SUCCESS; } METHOD(kernel_ipsec_t, del_policy, status_t, private_kernel_pfkey_ipsec_t *this, kernel_ipsec_policy_id_t *id, kernel_ipsec_manage_policy_t *data) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; struct sadb_x_policy *pol; policy_entry_t *policy, *found = NULL; policy_sa_t *mapping, *to_remove = NULL; enumerator_t *enumerator; bool first = TRUE, is_installed = TRUE; uint32_t priority, auto_priority; size_t len; ipsec_sa_t assigned_sa = { .src = data->src, .dst = data->dst, .cfg = *data->sa, }; if (dir2kernel(id->dir) == IPSEC_DIR_INVALID) { /* FWD policies are not supported on all platforms */ return SUCCESS; } DBG2(DBG_KNL, "deleting policy %R === %R %N", id->src_ts, id->dst_ts, policy_dir_names, id->dir); /* create a policy */ policy = create_policy_entry(id->src_ts, id->dst_ts, id->dir); /* find a matching policy */ this->mutex->lock(this->mutex); if (!this->policies->find_first(this->policies, policy_entry_equals, (void**)&found, policy)) { DBG1(DBG_KNL, "deleting policy %R === %R %N failed, not found", id->src_ts, id->dst_ts, policy_dir_names, id->dir); policy_entry_destroy(policy, this); this->mutex->unlock(this->mutex); return NOT_FOUND; } policy_entry_destroy(policy, this); policy = found; /* remove mapping to SA by reqid and priority, if multiple match, which * could happen when rekeying due to an address change, remove the oldest */ auto_priority = get_priority(policy, data->prio); priority = data->manual_prio ? data->manual_prio : auto_priority; enumerator = policy->used_by->create_enumerator(policy->used_by); while (enumerator->enumerate(enumerator, (void**)&mapping)) { if (priority == mapping->priority && auto_priority == mapping->auto_priority && data->type == mapping->type && ipsec_sa_equals(mapping->sa, &assigned_sa)) { to_remove = mapping; is_installed = first; } else if (priority < mapping->priority) { break; } first = FALSE; } enumerator->destroy(enumerator); if (!to_remove) { /* sanity check */ this->mutex->unlock(this->mutex); return SUCCESS; } policy->used_by->remove(policy->used_by, to_remove, NULL); if (policy->used_by->get_count(policy->used_by) > 0) { /* policy is used by more SAs, keep in kernel */ DBG2(DBG_KNL, "policy still used by another CHILD_SA, not removed"); if (is_installed) { /* check if there are actually any relevant changes, if not, we do * not send an update to the kernel as e.g. FreeBSD doesn't do that * atomically, causing unnecessary traffic loss during rekeyings */ policy->used_by->get_first(policy->used_by, (void**)&mapping); is_installed = policy_update_required(mapping, to_remove); } policy_sa_destroy(to_remove, id->dir, this); if (!is_installed) { /* no need to update as the policy */ this->mutex->unlock(this->mutex); return SUCCESS; } DBG2(DBG_KNL, "updating policy %R === %R %N", id->src_ts, id->dst_ts, policy_dir_names, id->dir); if (add_policy_internal(this, policy, mapping, TRUE) != SUCCESS) { DBG1(DBG_KNL, "unable to update policy %R === %R %N", id->src_ts, id->dst_ts, policy_dir_names, id->dir); return FAILED; } return SUCCESS; } memset(&request, 0, sizeof(request)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_X_SPDDELETE; msg->sadb_msg_satype = 0; msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); pol = (struct sadb_x_policy*)PFKEY_EXT_ADD_NEXT(msg); pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; pol->sadb_x_policy_len = PFKEY_LEN(sizeof(struct sadb_x_policy)); pol->sadb_x_policy_dir = dir2kernel(id->dir); pol->sadb_x_policy_type = type2kernel(to_remove->type); PFKEY_EXT_ADD(msg, pol); add_addr_ext(msg, policy->src.net, SADB_EXT_ADDRESS_SRC, policy->src.proto, policy->src.mask, TRUE); add_addr_ext(msg, policy->dst.net, SADB_EXT_ADDRESS_DST, policy->dst.proto, policy->dst.mask, TRUE); if (policy->route) { route_entry_t *route = policy->route; if (charon->kernel->del_route(charon->kernel, route->dst_net, route->prefixlen, route->gateway, route->src_ip, route->if_name, FALSE) != SUCCESS) { DBG1(DBG_KNL, "error uninstalling route installed with " "policy %R === %R %N", id->src_ts, id->dst_ts, policy_dir_names, id->dir); } remove_exclude_route(this, route); } this->policies->remove(this->policies, found, NULL); policy_sa_destroy(to_remove, id->dir, this); policy_entry_destroy(policy, this); this->mutex->unlock(this->mutex); if (pfkey_send(this, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to delete policy %R === %R %N", id->src_ts, id->dst_ts, policy_dir_names, id->dir); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to delete policy %R === %R %N: %s (%d)", id->src_ts, id->dst_ts, policy_dir_names, id->dir, strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } free(out); return SUCCESS; } METHOD(kernel_ipsec_t, flush_policies, status_t, private_kernel_pfkey_ipsec_t *this) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; size_t len; memset(&request, 0, sizeof(request)); DBG2(DBG_KNL, "flushing all policies from SPD"); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_X_SPDFLUSH; msg->sadb_msg_satype = SADB_SATYPE_UNSPEC; msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); if (pfkey_send(this, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to flush SPD entries"); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to flush SPD entries: %s (%d)", strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } free(out); return SUCCESS; } /** * Register a socket for ACQUIRE/EXPIRE messages */ static status_t register_pfkey_socket(private_kernel_pfkey_ipsec_t *this, uint8_t satype) { unsigned char request[PFKEY_BUFFER_SIZE]; struct sadb_msg *msg, *out; size_t len; memset(&request, 0, sizeof(request)); msg = (struct sadb_msg*)request; msg->sadb_msg_version = PF_KEY_V2; msg->sadb_msg_type = SADB_REGISTER; msg->sadb_msg_satype = satype; msg->sadb_msg_len = PFKEY_LEN(sizeof(struct sadb_msg)); if (pfkey_send_socket(this, this->socket_events, msg, &out, &len) != SUCCESS) { DBG1(DBG_KNL, "unable to register PF_KEY socket"); return FAILED; } else if (out->sadb_msg_errno) { DBG1(DBG_KNL, "unable to register PF_KEY socket: %s (%d)", strerror(out->sadb_msg_errno), out->sadb_msg_errno); free(out); return FAILED; } free(out); return SUCCESS; } METHOD(kernel_ipsec_t, bypass_socket, bool, private_kernel_pfkey_ipsec_t *this, int fd, int family) { struct sadb_x_policy policy; u_int sol, ipsec_policy; switch (family) { case AF_INET: { sol = SOL_IP; ipsec_policy = IP_IPSEC_POLICY; break; } case AF_INET6: { sol = SOL_IPV6; ipsec_policy = IPV6_IPSEC_POLICY; break; } default: return FALSE; } memset(&policy, 0, sizeof(policy)); policy.sadb_x_policy_len = sizeof(policy) / sizeof(uint64_t); policy.sadb_x_policy_exttype = SADB_X_EXT_POLICY; policy.sadb_x_policy_type = IPSEC_POLICY_BYPASS; policy.sadb_x_policy_dir = IPSEC_DIR_OUTBOUND; if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0) { DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s", strerror(errno)); return FALSE; } policy.sadb_x_policy_dir = IPSEC_DIR_INBOUND; if (setsockopt(fd, sol, ipsec_policy, &policy, sizeof(policy)) < 0) { DBG1(DBG_KNL, "unable to set IPSEC_POLICY on socket: %s", strerror(errno)); return FALSE; } return TRUE; } METHOD(kernel_ipsec_t, enable_udp_decap, bool, private_kernel_pfkey_ipsec_t *this, int fd, int family, uint16_t port) { #ifndef __APPLE__ int type = UDP_ENCAP_ESPINUDP; if (setsockopt(fd, SOL_UDP, UDP_ENCAP, &type, sizeof(type)) < 0) { DBG1(DBG_KNL, "unable to set UDP_ENCAP: %s", strerror(errno)); return FALSE; } #else /* __APPLE__ */ int intport = port; if (sysctlbyname("net.inet.ipsec.esp_port", NULL, NULL, &intport, sizeof(intport)) != 0) { DBG1(DBG_KNL, "could not set net.inet.ipsec.esp_port to %d: %s", port, strerror(errno)); return FALSE; } #endif /* __APPLE__ */ return TRUE; } METHOD(kernel_ipsec_t, destroy, void, private_kernel_pfkey_ipsec_t *this) { if (this->socket > 0) { close(this->socket); } if (this->socket_events > 0) { lib->watcher->remove(lib->watcher, this->socket_events); close(this->socket_events); } this->policies->invoke_function(this->policies, policy_entry_destroy_cb, this); this->policies->destroy(this->policies); this->excludes->destroy(this->excludes); this->sas->destroy(this->sas); this->mutex->destroy(this->mutex); this->mutex_pfkey->destroy(this->mutex_pfkey); free(this); } /* * Described in header. */ kernel_pfkey_ipsec_t *kernel_pfkey_ipsec_create() { private_kernel_pfkey_ipsec_t *this; bool register_for_events = TRUE; int rcv_buffer; INIT(this, .public = { .interface = { .get_spi = _get_spi, .get_cpi = _get_cpi, .add_sa = _add_sa, .update_sa = _update_sa, .query_sa = _query_sa, .del_sa = _del_sa, .flush_sas = _flush_sas, .add_policy = _add_policy, .query_policy = _query_policy, .del_policy = _del_policy, .flush_policies = _flush_policies, .bypass_socket = _bypass_socket, .enable_udp_decap = _enable_udp_decap, .destroy = _destroy, }, }, .policies = linked_list_create(), .excludes = linked_list_create(), .sas = hashtable_create((hashtable_hash_t)ipsec_sa_hash, (hashtable_equals_t)ipsec_sa_equals, 32), .mutex = mutex_create(MUTEX_TYPE_DEFAULT), .mutex_pfkey = mutex_create(MUTEX_TYPE_DEFAULT), .install_routes = lib->settings->get_bool(lib->settings, "%s.install_routes", TRUE, lib->ns), .route_via_internal = lib->settings->get_bool(lib->settings, "%s.plugins.kernel-pfkey.route_via_internal", FALSE, lib->ns), ); if (streq(lib->ns, "starter")) { /* starter has no threads, so we do not register for kernel events */ register_for_events = FALSE; } /* create a PF_KEY socket to communicate with the kernel */ this->socket = socket(PF_KEY, SOCK_RAW, PF_KEY_V2); if (this->socket <= 0) { DBG1(DBG_KNL, "unable to create PF_KEY socket"); destroy(this); return NULL; } if (register_for_events) { /* create a PF_KEY socket for ACQUIRE & EXPIRE */ this->socket_events = socket(PF_KEY, SOCK_RAW, PF_KEY_V2); if (this->socket_events <= 0) { DBG1(DBG_KNL, "unable to create PF_KEY event socket"); destroy(this); return NULL; } rcv_buffer = lib->settings->get_int(lib->settings, "%s.plugins.kernel-pfkey.events_buffer_size", 0, lib->ns); if (rcv_buffer > 0) { if (setsockopt(this->socket_events, SOL_SOCKET, SO_RCVBUF, &rcv_buffer, sizeof(rcv_buffer)) == -1) { DBG1(DBG_KNL, "unable to set receive buffer size on PF_KEY " "event socket: %s", strerror(errno)); } } /* register the event socket */ if (register_pfkey_socket(this, SADB_SATYPE_ESP) != SUCCESS || register_pfkey_socket(this, SADB_SATYPE_AH) != SUCCESS) { DBG1(DBG_KNL, "unable to register PF_KEY event socket"); destroy(this); return NULL; } lib->watcher->add(lib->watcher, this->socket_events, WATCHER_READ, (watcher_cb_t)receive_events, this); } return &this->public; }