/* $OpenBSD: pfkey.c,v 1.61 2019/06/28 13:32:44 deraadt Exp $ */ /* * Copyright (c) 2003, 2004 Henning Brauer * Copyright (c) 2003, 2004 Markus Friedl * Copyright (c) 2004, 2005 Hans-Joerg Hoexer * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ipsecctl.h" #include "pfkey.h" #define ROUNDUP(x) (((x) + (PFKEYV2_CHUNK - 1)) & ~(PFKEYV2_CHUNK - 1)) #define IOV_CNT 20 static int fd; static u_int32_t sadb_msg_seq = 1; static int pfkey_flow(int, u_int8_t, u_int8_t, u_int8_t, u_int8_t, struct ipsec_addr_wrap *, u_int16_t, struct ipsec_addr_wrap *, u_int16_t, struct ipsec_addr_wrap *, struct ipsec_addr_wrap *, struct ipsec_auth *, u_int8_t); static int pfkey_sa(int, u_int8_t, u_int8_t, u_int32_t, struct ipsec_addr_wrap *, struct ipsec_addr_wrap *, struct ipsec_transforms *, struct ipsec_key *, struct ipsec_key *, u_int8_t); static int pfkey_sabundle(int, u_int8_t, u_int8_t, u_int8_t, struct ipsec_addr_wrap *, u_int32_t, struct ipsec_addr_wrap *, u_int32_t); static int pfkey_reply(int, u_int8_t **, ssize_t *); int pfkey_parse(struct sadb_msg *, struct ipsec_rule *); int pfkey_ipsec_flush(void); int pfkey_ipsec_establish(int, struct ipsec_rule *); int pfkey_init(void); static int pfkey_flow(int sd, u_int8_t satype, u_int8_t action, u_int8_t direction, u_int8_t proto, struct ipsec_addr_wrap *src, u_int16_t sport, struct ipsec_addr_wrap *dst, u_int16_t dport, struct ipsec_addr_wrap *local, struct ipsec_addr_wrap *peer, struct ipsec_auth *auth, u_int8_t flowtype) { struct sadb_msg smsg; struct sadb_address sa_src, sa_dst, sa_local, sa_peer, sa_smask, sa_dmask; struct sadb_protocol sa_flowtype, sa_protocol; struct sadb_ident *sa_srcid, *sa_dstid; struct sockaddr_storage ssrc, sdst, slocal, speer, smask, dmask; struct iovec iov[IOV_CNT]; ssize_t n; int iov_cnt, len, ret = 0; sa_srcid = sa_dstid = NULL; bzero(&ssrc, sizeof(ssrc)); bzero(&smask, sizeof(smask)); ssrc.ss_family = smask.ss_family = src->af; switch (src->af) { case AF_INET: ((struct sockaddr_in *)&ssrc)->sin_addr = src->address.v4; ssrc.ss_len = sizeof(struct sockaddr_in); ((struct sockaddr_in *)&smask)->sin_addr = src->mask.v4; if (sport) { ((struct sockaddr_in *)&ssrc)->sin_port = sport; ((struct sockaddr_in *)&smask)->sin_port = 0xffff; } break; case AF_INET6: ((struct sockaddr_in6 *)&ssrc)->sin6_addr = src->address.v6; ssrc.ss_len = sizeof(struct sockaddr_in6); ((struct sockaddr_in6 *)&smask)->sin6_addr = src->mask.v6; if (sport) { ((struct sockaddr_in6 *)&ssrc)->sin6_port = sport; ((struct sockaddr_in6 *)&smask)->sin6_port = 0xffff; } break; default: warnx("unsupported address family %d", src->af); return -1; } smask.ss_len = ssrc.ss_len; bzero(&sdst, sizeof(sdst)); bzero(&dmask, sizeof(dmask)); sdst.ss_family = dmask.ss_family = dst->af; switch (dst->af) { case AF_INET: ((struct sockaddr_in *)&sdst)->sin_addr = dst->address.v4; sdst.ss_len = sizeof(struct sockaddr_in); ((struct sockaddr_in *)&dmask)->sin_addr = dst->mask.v4; if (dport) { ((struct sockaddr_in *)&sdst)->sin_port = dport; ((struct sockaddr_in *)&dmask)->sin_port = 0xffff; } break; case AF_INET6: ((struct sockaddr_in6 *)&sdst)->sin6_addr = dst->address.v6; sdst.ss_len = sizeof(struct sockaddr_in6); ((struct sockaddr_in6 *)&dmask)->sin6_addr = dst->mask.v6; if (dport) { ((struct sockaddr_in6 *)&sdst)->sin6_port = dport; ((struct sockaddr_in6 *)&dmask)->sin6_port = 0xffff; } break; default: warnx("unsupported address family %d", dst->af); return -1; } dmask.ss_len = sdst.ss_len; bzero(&slocal, sizeof(slocal)); if (local) { slocal.ss_family = local->af; switch (local->af) { case AF_INET: ((struct sockaddr_in *)&slocal)->sin_addr = local->address.v4; slocal.ss_len = sizeof(struct sockaddr_in); break; case AF_INET6: ((struct sockaddr_in6 *)&slocal)->sin6_addr = local->address.v6; slocal.ss_len = sizeof(struct sockaddr_in6); break; default: warnx("unsupported address family %d", local->af); return -1; } } bzero(&speer, sizeof(speer)); if (peer) { speer.ss_family = peer->af; switch (peer->af) { case AF_INET: ((struct sockaddr_in *)&speer)->sin_addr = peer->address.v4; speer.ss_len = sizeof(struct sockaddr_in); break; case AF_INET6: ((struct sockaddr_in6 *)&speer)->sin6_addr = peer->address.v6; speer.ss_len = sizeof(struct sockaddr_in6); break; default: warnx("unsupported address family %d", peer->af); return -1; } } bzero(&smsg, sizeof(smsg)); smsg.sadb_msg_version = PF_KEY_V2; smsg.sadb_msg_seq = sadb_msg_seq++; smsg.sadb_msg_pid = getpid(); smsg.sadb_msg_len = sizeof(smsg) / 8; smsg.sadb_msg_type = action; smsg.sadb_msg_satype = satype; bzero(&sa_flowtype, sizeof(sa_flowtype)); sa_flowtype.sadb_protocol_exttype = SADB_X_EXT_FLOW_TYPE; sa_flowtype.sadb_protocol_len = sizeof(sa_flowtype) / 8; sa_flowtype.sadb_protocol_direction = direction; switch (flowtype) { case TYPE_USE: sa_flowtype.sadb_protocol_proto = SADB_X_FLOW_TYPE_USE; break; case TYPE_ACQUIRE: sa_flowtype.sadb_protocol_proto = SADB_X_FLOW_TYPE_ACQUIRE; break; case TYPE_REQUIRE: sa_flowtype.sadb_protocol_proto = SADB_X_FLOW_TYPE_REQUIRE; break; case TYPE_DENY: sa_flowtype.sadb_protocol_proto = SADB_X_FLOW_TYPE_DENY; break; case TYPE_BYPASS: sa_flowtype.sadb_protocol_proto = SADB_X_FLOW_TYPE_BYPASS; break; case TYPE_DONTACQ: sa_flowtype.sadb_protocol_proto = SADB_X_FLOW_TYPE_DONTACQ; break; default: warnx("unsupported flowtype %d", flowtype); return -1; } bzero(&sa_protocol, sizeof(sa_protocol)); sa_protocol.sadb_protocol_exttype = SADB_X_EXT_PROTOCOL; sa_protocol.sadb_protocol_len = sizeof(sa_protocol) / 8; sa_protocol.sadb_protocol_direction = 0; sa_protocol.sadb_protocol_proto = proto; bzero(&sa_src, sizeof(sa_src)); sa_src.sadb_address_exttype = SADB_X_EXT_SRC_FLOW; sa_src.sadb_address_len = (sizeof(sa_src) + ROUNDUP(ssrc.ss_len)) / 8; bzero(&sa_smask, sizeof(sa_smask)); sa_smask.sadb_address_exttype = SADB_X_EXT_SRC_MASK; sa_smask.sadb_address_len = (sizeof(sa_smask) + ROUNDUP(smask.ss_len)) / 8; bzero(&sa_dst, sizeof(sa_dst)); sa_dst.sadb_address_exttype = SADB_X_EXT_DST_FLOW; sa_dst.sadb_address_len = (sizeof(sa_dst) + ROUNDUP(sdst.ss_len)) / 8; bzero(&sa_dmask, sizeof(sa_dmask)); sa_dmask.sadb_address_exttype = SADB_X_EXT_DST_MASK; sa_dmask.sadb_address_len = (sizeof(sa_dmask) + ROUNDUP(dmask.ss_len)) / 8; if (local) { bzero(&sa_local, sizeof(sa_local)); sa_local.sadb_address_exttype = SADB_EXT_ADDRESS_SRC; sa_local.sadb_address_len = (sizeof(sa_local) + ROUNDUP(slocal.ss_len)) / 8; } if (peer) { bzero(&sa_peer, sizeof(sa_peer)); sa_peer.sadb_address_exttype = SADB_EXT_ADDRESS_DST; sa_peer.sadb_address_len = (sizeof(sa_peer) + ROUNDUP(speer.ss_len)) / 8; } if (auth && auth->srcid) { len = ROUNDUP(strlen(auth->srcid) + 1) + sizeof(*sa_srcid); sa_srcid = calloc(len, sizeof(u_int8_t)); if (sa_srcid == NULL) err(1, "pfkey_flow: calloc"); sa_srcid->sadb_ident_type = auth->srcid_type; sa_srcid->sadb_ident_len = len / 8; sa_srcid->sadb_ident_exttype = SADB_EXT_IDENTITY_SRC; strlcpy((char *)(sa_srcid + 1), auth->srcid, ROUNDUP(strlen(auth->srcid) + 1)); } if (auth && auth->dstid) { len = ROUNDUP(strlen(auth->dstid) + 1) + sizeof(*sa_dstid); sa_dstid = calloc(len, sizeof(u_int8_t)); if (sa_dstid == NULL) err(1, "pfkey_flow: calloc"); sa_dstid->sadb_ident_type = auth->dstid_type; sa_dstid->sadb_ident_len = len / 8; sa_dstid->sadb_ident_exttype = SADB_EXT_IDENTITY_DST; strlcpy((char *)(sa_dstid + 1), auth->dstid, ROUNDUP(strlen(auth->dstid) + 1)); } iov_cnt = 0; /* header */ iov[iov_cnt].iov_base = &smsg; iov[iov_cnt].iov_len = sizeof(smsg); iov_cnt++; /* add flow type */ iov[iov_cnt].iov_base = &sa_flowtype; iov[iov_cnt].iov_len = sizeof(sa_flowtype); smsg.sadb_msg_len += sa_flowtype.sadb_protocol_len; iov_cnt++; /* local ip */ if (local) { iov[iov_cnt].iov_base = &sa_local; iov[iov_cnt].iov_len = sizeof(sa_local); iov_cnt++; iov[iov_cnt].iov_base = &slocal; iov[iov_cnt].iov_len = ROUNDUP(slocal.ss_len); smsg.sadb_msg_len += sa_local.sadb_address_len; iov_cnt++; } /* remote peer */ if (peer) { iov[iov_cnt].iov_base = &sa_peer; iov[iov_cnt].iov_len = sizeof(sa_peer); iov_cnt++; iov[iov_cnt].iov_base = &speer; iov[iov_cnt].iov_len = ROUNDUP(speer.ss_len); smsg.sadb_msg_len += sa_peer.sadb_address_len; iov_cnt++; } /* src addr */ iov[iov_cnt].iov_base = &sa_src; iov[iov_cnt].iov_len = sizeof(sa_src); iov_cnt++; iov[iov_cnt].iov_base = &ssrc; iov[iov_cnt].iov_len = ROUNDUP(ssrc.ss_len); smsg.sadb_msg_len += sa_src.sadb_address_len; iov_cnt++; /* src mask */ iov[iov_cnt].iov_base = &sa_smask; iov[iov_cnt].iov_len = sizeof(sa_smask); iov_cnt++; iov[iov_cnt].iov_base = &smask; iov[iov_cnt].iov_len = ROUNDUP(smask.ss_len); smsg.sadb_msg_len += sa_smask.sadb_address_len; iov_cnt++; /* dest addr */ iov[iov_cnt].iov_base = &sa_dst; iov[iov_cnt].iov_len = sizeof(sa_dst); iov_cnt++; iov[iov_cnt].iov_base = &sdst; iov[iov_cnt].iov_len = ROUNDUP(sdst.ss_len); smsg.sadb_msg_len += sa_dst.sadb_address_len; iov_cnt++; /* dst mask */ iov[iov_cnt].iov_base = &sa_dmask; iov[iov_cnt].iov_len = sizeof(sa_dmask); iov_cnt++; iov[iov_cnt].iov_base = &dmask; iov[iov_cnt].iov_len = ROUNDUP(dmask.ss_len); smsg.sadb_msg_len += sa_dmask.sadb_address_len; iov_cnt++; /* add protocol */ iov[iov_cnt].iov_base = &sa_protocol; iov[iov_cnt].iov_len = sizeof(sa_protocol); smsg.sadb_msg_len += sa_protocol.sadb_protocol_len; iov_cnt++; if (sa_srcid) { /* src identity */ iov[iov_cnt].iov_base = sa_srcid; iov[iov_cnt].iov_len = sa_srcid->sadb_ident_len * 8; smsg.sadb_msg_len += sa_srcid->sadb_ident_len; iov_cnt++; } if (sa_dstid) { /* dst identity */ iov[iov_cnt].iov_base = sa_dstid; iov[iov_cnt].iov_len = sa_dstid->sadb_ident_len * 8; smsg.sadb_msg_len += sa_dstid->sadb_ident_len; iov_cnt++; } len = smsg.sadb_msg_len * 8; do { n = writev(sd, iov, iov_cnt); } while (n == -1 && (errno == EAGAIN || errno == EINTR)); if (n == -1) { warn("writev failed"); ret = -1; } free(sa_srcid); free(sa_dstid); return ret; } static int pfkey_sa(int sd, u_int8_t satype, u_int8_t action, u_int32_t spi, struct ipsec_addr_wrap *src, struct ipsec_addr_wrap *dst, struct ipsec_transforms *xfs, struct ipsec_key *authkey, struct ipsec_key *enckey, u_int8_t tmode) { struct sadb_msg smsg; struct sadb_sa sa; struct sadb_address sa_src, sa_dst; struct sadb_key sa_authkey, sa_enckey; struct sockaddr_storage ssrc, sdst; struct iovec iov[IOV_CNT]; ssize_t n; int iov_cnt, len, ret = 0; bzero(&ssrc, sizeof(ssrc)); ssrc.ss_family = src->af; switch (src->af) { case AF_INET: ((struct sockaddr_in *)&ssrc)->sin_addr = src->address.v4; ssrc.ss_len = sizeof(struct sockaddr_in); break; case AF_INET6: ((struct sockaddr_in6 *)&ssrc)->sin6_addr = src->address.v6; ssrc.ss_len = sizeof(struct sockaddr_in6); break; default: warnx("unsupported address family %d", src->af); return -1; } bzero(&sdst, sizeof(sdst)); sdst.ss_family = dst->af; switch (dst->af) { case AF_INET: ((struct sockaddr_in *)&sdst)->sin_addr = dst->address.v4; sdst.ss_len = sizeof(struct sockaddr_in); break; case AF_INET6: ((struct sockaddr_in6 *)&sdst)->sin6_addr = dst->address.v6; sdst.ss_len = sizeof(struct sockaddr_in6); break; default: warnx("unsupported address family %d", dst->af); return -1; } bzero(&smsg, sizeof(smsg)); smsg.sadb_msg_version = PF_KEY_V2; smsg.sadb_msg_seq = sadb_msg_seq++; smsg.sadb_msg_pid = getpid(); smsg.sadb_msg_len = sizeof(smsg) / 8; smsg.sadb_msg_type = action; smsg.sadb_msg_satype = satype; bzero(&sa, sizeof(sa)); sa.sadb_sa_len = sizeof(sa) / 8; sa.sadb_sa_exttype = SADB_EXT_SA; sa.sadb_sa_spi = htonl(spi); sa.sadb_sa_state = SADB_SASTATE_MATURE; if (satype != SADB_X_SATYPE_IPIP && tmode == IPSEC_TUNNEL) sa.sadb_sa_flags |= SADB_X_SAFLAGS_TUNNEL; if (xfs && xfs->authxf) { switch (xfs->authxf->id) { case AUTHXF_NONE: break; case AUTHXF_HMAC_MD5: sa.sadb_sa_auth = SADB_AALG_MD5HMAC; break; case AUTHXF_HMAC_RIPEMD160: sa.sadb_sa_auth = SADB_X_AALG_RIPEMD160HMAC; break; case AUTHXF_HMAC_SHA1: sa.sadb_sa_auth = SADB_AALG_SHA1HMAC; break; case AUTHXF_HMAC_SHA2_256: sa.sadb_sa_auth = SADB_X_AALG_SHA2_256; break; case AUTHXF_HMAC_SHA2_384: sa.sadb_sa_auth = SADB_X_AALG_SHA2_384; break; case AUTHXF_HMAC_SHA2_512: sa.sadb_sa_auth = SADB_X_AALG_SHA2_512; break; default: warnx("unsupported authentication algorithm %d", xfs->authxf->id); } } if (xfs && xfs->encxf) { switch (xfs->encxf->id) { case ENCXF_NONE: break; case ENCXF_3DES_CBC: sa.sadb_sa_encrypt = SADB_EALG_3DESCBC; break; case ENCXF_AES: case ENCXF_AES_128: case ENCXF_AES_192: case ENCXF_AES_256: sa.sadb_sa_encrypt = SADB_X_EALG_AES; break; case ENCXF_AESCTR: case ENCXF_AES_128_CTR: case ENCXF_AES_192_CTR: case ENCXF_AES_256_CTR: sa.sadb_sa_encrypt = SADB_X_EALG_AESCTR; break; case ENCXF_AES_128_GCM: case ENCXF_AES_192_GCM: case ENCXF_AES_256_GCM: sa.sadb_sa_encrypt = SADB_X_EALG_AESGCM16; break; case ENCXF_AES_128_GMAC: case ENCXF_AES_192_GMAC: case ENCXF_AES_256_GMAC: sa.sadb_sa_encrypt = SADB_X_EALG_AESGMAC; break; case ENCXF_BLOWFISH: sa.sadb_sa_encrypt = SADB_X_EALG_BLF; break; case ENCXF_CAST128: sa.sadb_sa_encrypt = SADB_X_EALG_CAST; break; case ENCXF_NULL: sa.sadb_sa_encrypt = SADB_EALG_NULL; break; default: warnx("unsupported encryption algorithm %d", xfs->encxf->id); } } if (xfs && xfs->compxf) { switch (xfs->compxf->id) { case COMPXF_DEFLATE: sa.sadb_sa_encrypt = SADB_X_CALG_DEFLATE; break; case COMPXF_LZS: sa.sadb_sa_encrypt = SADB_X_CALG_LZS; break; default: warnx("unsupported compression algorithm %d", xfs->compxf->id); } } bzero(&sa_src, sizeof(sa_src)); sa_src.sadb_address_len = (sizeof(sa_src) + ROUNDUP(ssrc.ss_len)) / 8; sa_src.sadb_address_exttype = SADB_EXT_ADDRESS_SRC; bzero(&sa_dst, sizeof(sa_dst)); sa_dst.sadb_address_len = (sizeof(sa_dst) + ROUNDUP(sdst.ss_len)) / 8; sa_dst.sadb_address_exttype = SADB_EXT_ADDRESS_DST; if (action == SADB_ADD && !authkey && !enckey && satype != SADB_X_SATYPE_IPCOMP && satype != SADB_X_SATYPE_IPIP) { /* XXX ENCNULL */ warnx("no key specified"); return -1; } if (authkey) { bzero(&sa_authkey, sizeof(sa_authkey)); sa_authkey.sadb_key_len = (sizeof(sa_authkey) + ((authkey->len + 7) / 8) * 8) / 8; sa_authkey.sadb_key_exttype = SADB_EXT_KEY_AUTH; sa_authkey.sadb_key_bits = 8 * authkey->len; } if (enckey) { bzero(&sa_enckey, sizeof(sa_enckey)); sa_enckey.sadb_key_len = (sizeof(sa_enckey) + ((enckey->len + 7) / 8) * 8) / 8; sa_enckey.sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; sa_enckey.sadb_key_bits = 8 * enckey->len; } iov_cnt = 0; /* header */ iov[iov_cnt].iov_base = &smsg; iov[iov_cnt].iov_len = sizeof(smsg); iov_cnt++; /* sa */ iov[iov_cnt].iov_base = &sa; iov[iov_cnt].iov_len = sizeof(sa); smsg.sadb_msg_len += sa.sadb_sa_len; iov_cnt++; /* src addr */ iov[iov_cnt].iov_base = &sa_src; iov[iov_cnt].iov_len = sizeof(sa_src); iov_cnt++; iov[iov_cnt].iov_base = &ssrc; iov[iov_cnt].iov_len = ROUNDUP(ssrc.ss_len); smsg.sadb_msg_len += sa_src.sadb_address_len; iov_cnt++; /* dst addr */ iov[iov_cnt].iov_base = &sa_dst; iov[iov_cnt].iov_len = sizeof(sa_dst); iov_cnt++; iov[iov_cnt].iov_base = &sdst; iov[iov_cnt].iov_len = ROUNDUP(sdst.ss_len); smsg.sadb_msg_len += sa_dst.sadb_address_len; iov_cnt++; if (authkey) { /* authentication key */ iov[iov_cnt].iov_base = &sa_authkey; iov[iov_cnt].iov_len = sizeof(sa_authkey); iov_cnt++; iov[iov_cnt].iov_base = authkey->data; iov[iov_cnt].iov_len = ((authkey->len + 7) / 8) * 8; smsg.sadb_msg_len += sa_authkey.sadb_key_len; iov_cnt++; } if (enckey) { /* encryption key */ iov[iov_cnt].iov_base = &sa_enckey; iov[iov_cnt].iov_len = sizeof(sa_enckey); iov_cnt++; iov[iov_cnt].iov_base = enckey->data; iov[iov_cnt].iov_len = ((enckey->len + 7) / 8) * 8; smsg.sadb_msg_len += sa_enckey.sadb_key_len; iov_cnt++; } len = smsg.sadb_msg_len * 8; if ((n = writev(sd, iov, iov_cnt)) == -1) { warn("writev failed"); ret = -1; } else if (n != len) { warnx("short write"); ret = -1; } return ret; } static int pfkey_sabundle(int sd, u_int8_t satype, u_int8_t satype2, u_int8_t action, struct ipsec_addr_wrap *dst, u_int32_t spi, struct ipsec_addr_wrap *dst2, u_int32_t spi2) { struct sadb_msg smsg; struct sadb_sa sa1, sa2; struct sadb_address sa_dst, sa_dst2; struct sockaddr_storage sdst, sdst2; struct sadb_protocol sa_proto; struct iovec iov[IOV_CNT]; ssize_t n; int iov_cnt, len, ret = 0; bzero(&sdst, sizeof(sdst)); sdst.ss_family = dst->af; switch (dst->af) { case AF_INET: ((struct sockaddr_in *)&sdst)->sin_addr = dst->address.v4; sdst.ss_len = sizeof(struct sockaddr_in); break; case AF_INET6: ((struct sockaddr_in6 *)&sdst)->sin6_addr = dst->address.v6; sdst.ss_len = sizeof(struct sockaddr_in6); break; default: warnx("unsupported address family %d", dst->af); return -1; } bzero(&sdst2, sizeof(sdst2)); sdst2.ss_family = dst2->af; switch (dst2->af) { case AF_INET: ((struct sockaddr_in *)&sdst2)->sin_addr = dst2->address.v4; sdst2.ss_len = sizeof(struct sockaddr_in); break; case AF_INET6: ((struct sockaddr_in6 *)&sdst2)->sin6_addr = dst2->address.v6; sdst2.ss_len = sizeof(struct sockaddr_in6); break; default: warnx("unsupported address family %d", dst2->af); return -1; } bzero(&smsg, sizeof(smsg)); smsg.sadb_msg_version = PF_KEY_V2; smsg.sadb_msg_seq = sadb_msg_seq++; smsg.sadb_msg_pid = getpid(); smsg.sadb_msg_len = sizeof(smsg) / 8; smsg.sadb_msg_type = action; smsg.sadb_msg_satype = satype; bzero(&sa1, sizeof(sa1)); sa1.sadb_sa_len = sizeof(sa1) / 8; sa1.sadb_sa_exttype = SADB_EXT_SA; sa1.sadb_sa_spi = htonl(spi); sa1.sadb_sa_state = SADB_SASTATE_MATURE; bzero(&sa2, sizeof(sa2)); sa2.sadb_sa_len = sizeof(sa2) / 8; sa2.sadb_sa_exttype = SADB_X_EXT_SA2; sa2.sadb_sa_spi = htonl(spi2); sa2.sadb_sa_state = SADB_SASTATE_MATURE; iov_cnt = 0; bzero(&sa_dst, sizeof(sa_dst)); sa_dst.sadb_address_exttype = SADB_EXT_ADDRESS_DST; sa_dst.sadb_address_len = (sizeof(sa_dst) + ROUNDUP(sdst.ss_len)) / 8; bzero(&sa_dst2, sizeof(sa_dst2)); sa_dst2.sadb_address_exttype = SADB_X_EXT_DST2; sa_dst2.sadb_address_len = (sizeof(sa_dst2) + ROUNDUP(sdst2.ss_len)) / 8; bzero(&sa_proto, sizeof(sa_proto)); sa_proto.sadb_protocol_exttype = SADB_X_EXT_SATYPE2; sa_proto.sadb_protocol_len = sizeof(sa_proto) / 8; sa_proto.sadb_protocol_direction = 0; sa_proto.sadb_protocol_proto = satype2; /* header */ iov[iov_cnt].iov_base = &smsg; iov[iov_cnt].iov_len = sizeof(smsg); iov_cnt++; /* sa */ iov[iov_cnt].iov_base = &sa1; iov[iov_cnt].iov_len = sizeof(sa1); smsg.sadb_msg_len += sa1.sadb_sa_len; iov_cnt++; /* dst addr */ iov[iov_cnt].iov_base = &sa_dst; iov[iov_cnt].iov_len = sizeof(sa_dst); iov_cnt++; iov[iov_cnt].iov_base = &sdst; iov[iov_cnt].iov_len = ROUNDUP(sdst.ss_len); smsg.sadb_msg_len += sa_dst.sadb_address_len; iov_cnt++; /* second sa */ iov[iov_cnt].iov_base = &sa2; iov[iov_cnt].iov_len = sizeof(sa2); smsg.sadb_msg_len += sa2.sadb_sa_len; iov_cnt++; /* second dst addr */ iov[iov_cnt].iov_base = &sa_dst2; iov[iov_cnt].iov_len = sizeof(sa_dst2); iov_cnt++; iov[iov_cnt].iov_base = &sdst2; iov[iov_cnt].iov_len = ROUNDUP(sdst2.ss_len); smsg.sadb_msg_len += sa_dst2.sadb_address_len; iov_cnt++; /* SA type */ iov[iov_cnt].iov_base = &sa_proto; iov[iov_cnt].iov_len = sizeof(sa_proto); smsg.sadb_msg_len += sa_proto.sadb_protocol_len; iov_cnt++; len = smsg.sadb_msg_len * 8; if ((n = writev(sd, iov, iov_cnt)) == -1) { warn("writev failed"); ret = -1; } else if (n != len) { warnx("short write"); ret = -1; } return (ret); } static int pfkey_reply(int sd, u_int8_t **datap, ssize_t *lenp) { struct sadb_msg hdr; ssize_t len; u_int8_t *data; if (recv(sd, &hdr, sizeof(hdr), MSG_PEEK) != sizeof(hdr)) { warnx("short read"); return -1; } len = hdr.sadb_msg_len * PFKEYV2_CHUNK; if ((data = malloc(len)) == NULL) err(1, "pfkey_reply: malloc"); if (read(sd, data, len) != len) { warn("PF_KEY short read"); freezero(data, len); return -1; } if (datap) { *datap = data; if (lenp) *lenp = len; } else { freezero(data, len); } if (datap == NULL && hdr.sadb_msg_errno != 0) { errno = hdr.sadb_msg_errno; if (errno != EEXIST) { warn("PF_KEY failed"); return -1; } } return 0; } int pfkey_parse(struct sadb_msg *msg, struct ipsec_rule *rule) { struct sadb_ext *ext; struct sadb_address *saddr; struct sadb_protocol *sproto; struct sadb_ident *sident; struct sockaddr *sa; struct sockaddr_in *sa_in; struct sockaddr_in6 *sa_in6; int len; switch (msg->sadb_msg_satype) { case SADB_SATYPE_ESP: rule->satype = IPSEC_ESP; break; case SADB_SATYPE_AH: rule->satype = IPSEC_AH; break; case SADB_X_SATYPE_IPCOMP: rule->satype = IPSEC_IPCOMP; break; case SADB_X_SATYPE_IPIP: rule->satype = IPSEC_IPIP; break; default: return (1); } for (ext = (struct sadb_ext *)(msg + 1); (size_t)((u_int8_t *)ext - (u_int8_t *)msg) < msg->sadb_msg_len * PFKEYV2_CHUNK && ext->sadb_ext_len > 0; ext = (struct sadb_ext *)((u_int8_t *)ext + ext->sadb_ext_len * PFKEYV2_CHUNK)) { switch (ext->sadb_ext_type) { case SADB_EXT_ADDRESS_SRC: saddr = (struct sadb_address *)ext; sa = (struct sockaddr *)(saddr + 1); rule->local = calloc(1, sizeof(struct ipsec_addr_wrap)); if (rule->local == NULL) err(1, "pfkey_parse: calloc"); rule->local->af = sa->sa_family; switch (sa->sa_family) { case AF_INET: bcopy(&((struct sockaddr_in *)sa)->sin_addr, &rule->local->address.v4, sizeof(struct in_addr)); set_ipmask(rule->local, 32); break; case AF_INET6: bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr, &rule->local->address.v6, sizeof(struct in6_addr)); set_ipmask(rule->local, 128); break; default: return (1); } break; case SADB_EXT_ADDRESS_DST: saddr = (struct sadb_address *)ext; sa = (struct sockaddr *)(saddr + 1); rule->peer = calloc(1, sizeof(struct ipsec_addr_wrap)); if (rule->peer == NULL) err(1, "pfkey_parse: calloc"); rule->peer->af = sa->sa_family; switch (sa->sa_family) { case AF_INET: bcopy(&((struct sockaddr_in *)sa)->sin_addr, &rule->peer->address.v4, sizeof(struct in_addr)); set_ipmask(rule->peer, 32); break; case AF_INET6: bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr, &rule->peer->address.v6, sizeof(struct in6_addr)); set_ipmask(rule->peer, 128); break; default: return (1); } break; case SADB_EXT_IDENTITY_SRC: sident = (struct sadb_ident *)ext; len = (sident->sadb_ident_len * sizeof(uint64_t)) - sizeof(struct sadb_ident); if (rule->auth == NULL) { rule->auth = calloc(1, sizeof(struct ipsec_auth)); if (rule->auth == NULL) err(1, "pfkey_parse: calloc"); } rule->auth->srcid = calloc(1, len); if (rule->auth->srcid == NULL) err(1, "pfkey_parse: calloc"); strlcpy(rule->auth->srcid, (char *)(sident + 1), len); break; case SADB_EXT_IDENTITY_DST: sident = (struct sadb_ident *)ext; len = (sident->sadb_ident_len * sizeof(uint64_t)) - sizeof(struct sadb_ident); if (rule->auth == NULL) { rule->auth = calloc(1, sizeof(struct ipsec_auth)); if (rule->auth == NULL) err(1, "pfkey_parse: calloc"); } rule->auth->dstid = calloc(1, len); if (rule->auth->dstid == NULL) err(1, "pfkey_parse: calloc"); strlcpy(rule->auth->dstid, (char *)(sident + 1), len); break; case SADB_X_EXT_PROTOCOL: sproto = (struct sadb_protocol *)ext; if (sproto->sadb_protocol_direction == 0) rule->proto = sproto->sadb_protocol_proto; break; case SADB_X_EXT_FLOW_TYPE: sproto = (struct sadb_protocol *)ext; switch (sproto->sadb_protocol_direction) { case IPSP_DIRECTION_IN: rule->direction = IPSEC_IN; break; case IPSP_DIRECTION_OUT: rule->direction = IPSEC_OUT; break; default: return (1); } switch (sproto->sadb_protocol_proto) { case SADB_X_FLOW_TYPE_USE: rule->flowtype = TYPE_USE; break; case SADB_X_FLOW_TYPE_ACQUIRE: rule->flowtype = TYPE_ACQUIRE; break; case SADB_X_FLOW_TYPE_REQUIRE: rule->flowtype = TYPE_REQUIRE; break; case SADB_X_FLOW_TYPE_DENY: rule->flowtype = TYPE_DENY; break; case SADB_X_FLOW_TYPE_BYPASS: rule->flowtype = TYPE_BYPASS; break; case SADB_X_FLOW_TYPE_DONTACQ: rule->flowtype = TYPE_DONTACQ; break; default: rule->flowtype = TYPE_UNKNOWN; break; } break; case SADB_X_EXT_SRC_FLOW: saddr = (struct sadb_address *)ext; sa = (struct sockaddr *)(saddr + 1); if (rule->src == NULL) { rule->src = calloc(1, sizeof(struct ipsec_addr_wrap)); if (rule->src == NULL) err(1, "pfkey_parse: calloc"); } rule->src->af = sa->sa_family; switch (sa->sa_family) { case AF_INET: bcopy(&((struct sockaddr_in *)sa)->sin_addr, &rule->src->address.v4, sizeof(struct in_addr)); rule->sport = ((struct sockaddr_in *)sa)->sin_port; break; case AF_INET6: bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr, &rule->src->address.v6, sizeof(struct in6_addr)); rule->sport = ((struct sockaddr_in6 *)sa)->sin6_port; break; default: return (1); } break; case SADB_X_EXT_DST_FLOW: saddr = (struct sadb_address *)ext; sa = (struct sockaddr *)(saddr + 1); if (rule->dst == NULL) { rule->dst = calloc(1, sizeof(struct ipsec_addr_wrap)); if (rule->dst == NULL) err(1, "pfkey_parse: calloc"); } rule->dst->af = sa->sa_family; switch (sa->sa_family) { case AF_INET: bcopy(&((struct sockaddr_in *)sa)->sin_addr, &rule->dst->address.v4, sizeof(struct in_addr)); rule->dport = ((struct sockaddr_in *)sa)->sin_port; break; case AF_INET6: bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr, &rule->dst->address.v6, sizeof(struct in6_addr)); rule->dport = ((struct sockaddr_in6 *)sa)->sin6_port; break; default: return (1); } break; case SADB_X_EXT_SRC_MASK: saddr = (struct sadb_address *)ext; sa = (struct sockaddr *)(saddr + 1); if (rule->src == NULL) { rule->src = calloc(1, sizeof(struct ipsec_addr_wrap)); if (rule->src == NULL) err(1, "pfkey_parse: calloc"); } rule->src->af = sa->sa_family; switch (sa->sa_family) { case AF_INET: sa_in = (struct sockaddr_in *)sa; bcopy(&sa_in->sin_addr, &rule->src->mask.v4, sizeof(struct in_addr)); break; case AF_INET6: sa_in6 = (struct sockaddr_in6 *)sa; bcopy(&sa_in6->sin6_addr, &rule->src->mask.v6, sizeof(struct in6_addr)); break; default: return (1); } break; case SADB_X_EXT_DST_MASK: saddr = (struct sadb_address *)ext; sa = (struct sockaddr *)(saddr + 1); if (rule->dst == NULL) { rule->dst = calloc(1, sizeof(struct ipsec_addr_wrap)); if (rule->dst == NULL) err(1, "pfkey_parse: calloc"); } rule->dst->af = sa->sa_family; switch (sa->sa_family) { case AF_INET: sa_in = (struct sockaddr_in *)sa; bcopy(&sa_in->sin_addr, &rule->dst->mask.v4, sizeof(struct in_addr)); break; case AF_INET6: sa_in6 = (struct sockaddr_in6 *)sa; bcopy(&sa_in6->sin6_addr, &rule->dst->mask.v6, sizeof(struct in6_addr)); break; default: return (1); } break; default: return (1); } } return (0); } int pfkey_ipsec_establish(int action, struct ipsec_rule *r) { int ret; u_int8_t satype, satype2, direction; if (r->type == RULE_FLOW) { switch (r->satype) { case IPSEC_ESP: satype = SADB_SATYPE_ESP; break; case IPSEC_AH: satype = SADB_SATYPE_AH; break; case IPSEC_IPCOMP: satype = SADB_X_SATYPE_IPCOMP; break; case IPSEC_IPIP: satype = SADB_X_SATYPE_IPIP; break; default: return -1; } switch (r->direction) { case IPSEC_IN: direction = IPSP_DIRECTION_IN; break; case IPSEC_OUT: direction = IPSP_DIRECTION_OUT; break; default: return -1; } switch (action) { case ACTION_ADD: ret = pfkey_flow(fd, satype, SADB_X_ADDFLOW, direction, r->proto, r->src, r->sport, r->dst, r->dport, r->local, r->peer, r->auth, r->flowtype); break; case ACTION_DELETE: /* No peer for flow deletion. */ ret = pfkey_flow(fd, satype, SADB_X_DELFLOW, direction, r->proto, r->src, r->sport, r->dst, r->dport, NULL, NULL, NULL, r->flowtype); break; default: return -1; } } else if (r->type == RULE_SA) { switch (r->satype) { case IPSEC_AH: satype = SADB_SATYPE_AH; break; case IPSEC_ESP: satype = SADB_SATYPE_ESP; break; case IPSEC_IPCOMP: satype = SADB_X_SATYPE_IPCOMP; break; case IPSEC_TCPMD5: satype = SADB_X_SATYPE_TCPSIGNATURE; break; case IPSEC_IPIP: satype = SADB_X_SATYPE_IPIP; break; default: return -1; } switch (action) { case ACTION_ADD: ret = pfkey_sa(fd, satype, SADB_ADD, r->spi, r->src, r->dst, r->xfs, r->authkey, r->enckey, r->tmode); break; case ACTION_DELETE: ret = pfkey_sa(fd, satype, SADB_DELETE, r->spi, r->src, r->dst, r->xfs, NULL, NULL, r->tmode); break; default: return -1; } } else if (r->type == RULE_BUNDLE) { switch (r->satype) { case IPSEC_AH: satype = SADB_SATYPE_AH; break; case IPSEC_ESP: satype = SADB_SATYPE_ESP; break; case IPSEC_IPCOMP: satype = SADB_X_SATYPE_IPCOMP; break; case IPSEC_TCPMD5: satype = SADB_X_SATYPE_TCPSIGNATURE; break; case IPSEC_IPIP: satype = SADB_X_SATYPE_IPIP; break; default: return -1; } switch (r->proto2) { case IPSEC_AH: satype2 = SADB_SATYPE_AH; break; case IPSEC_ESP: satype2 = SADB_SATYPE_ESP; break; case IPSEC_IPCOMP: satype2 = SADB_X_SATYPE_IPCOMP; break; case IPSEC_TCPMD5: satype2 = SADB_X_SATYPE_TCPSIGNATURE; break; case IPSEC_IPIP: satype2 = SADB_X_SATYPE_IPIP; break; default: return -1; } switch (action) { case ACTION_ADD: ret = pfkey_sabundle(fd, satype, satype2, SADB_X_GRPSPIS, r->dst, r->spi, r->dst2, r->spi2); break; case ACTION_DELETE: return 0; default: return -1; } } else return -1; if (ret < 0) return -1; if (pfkey_reply(fd, NULL, NULL) < 0) return -1; return 0; } int pfkey_ipsec_flush(void) { struct sadb_msg smsg; struct iovec iov[IOV_CNT]; ssize_t n; int iov_cnt, len; bzero(&smsg, sizeof(smsg)); smsg.sadb_msg_version = PF_KEY_V2; smsg.sadb_msg_seq = sadb_msg_seq++; smsg.sadb_msg_pid = getpid(); smsg.sadb_msg_len = sizeof(smsg) / 8; smsg.sadb_msg_type = SADB_FLUSH; smsg.sadb_msg_satype = SADB_SATYPE_UNSPEC; iov_cnt = 0; iov[iov_cnt].iov_base = &smsg; iov[iov_cnt].iov_len = sizeof(smsg); iov_cnt++; len = smsg.sadb_msg_len * 8; if ((n = writev(fd, iov, iov_cnt)) == -1) { warn("writev failed"); return -1; } if (n != len) { warnx("short write"); return -1; } if (pfkey_reply(fd, NULL, NULL) < 0) return -1; return 0; } static int pfkey_promisc(void) { struct sadb_msg msg; memset(&msg, 0, sizeof(msg)); msg.sadb_msg_version = PF_KEY_V2; msg.sadb_msg_seq = sadb_msg_seq++; msg.sadb_msg_pid = getpid(); msg.sadb_msg_len = sizeof(msg) / PFKEYV2_CHUNK; msg.sadb_msg_type = SADB_X_PROMISC; msg.sadb_msg_satype = 1; /* enable */ if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) { warn("pfkey_promisc: write failed"); return -1; } if (pfkey_reply(fd, NULL, NULL) < 0) return -1; return 0; } int pfkey_monitor(int opts) { struct pollfd pfd[1]; struct sadb_msg *msg; u_int8_t *data; ssize_t len; int n; if (pfkey_init() < 0) return -1; if (pfkey_promisc() < 0) return -1; pfd[0].fd = fd; pfd[0].events = POLLIN; for (;;) { if ((n = poll(pfd, 1, -1)) == -1) err(2, "poll"); if (n == 0) break; if ((pfd[0].revents & POLLIN) == 0) continue; if (pfkey_reply(fd, &data, &len) < 0) continue; msg = (struct sadb_msg *)data; if (msg->sadb_msg_type == SADB_X_PROMISC) { /* remove extra header from promisc messages */ if ((msg->sadb_msg_len * PFKEYV2_CHUNK) >= 2 * sizeof(struct sadb_msg)) { msg++; } } pfkey_monitor_sa(msg, opts); if (opts & IPSECCTL_OPT_VERBOSE) pfkey_print_raw(data, len); freezero(data, len); } close(fd); return 0; } int pfkey_init(void) { if ((fd = socket(PF_KEY, SOCK_RAW, PF_KEY_V2)) == -1) err(1, "pfkey_init: failed to open PF_KEY socket"); return 0; }