188768458SSam Leffler /* $FreeBSD$ */ 288768458SSam Leffler /* $OpenBSD: ip_esp.c,v 1.69 2001/06/26 06:18:59 angelos Exp $ */ 3c398230bSWarner Losh /*- 488768458SSam Leffler * The authors of this code are John Ioannidis (ji@tla.org), 588768458SSam Leffler * Angelos D. Keromytis (kermit@csd.uch.gr) and 688768458SSam Leffler * Niels Provos (provos@physnet.uni-hamburg.de). 788768458SSam Leffler * 888768458SSam Leffler * The original version of this code was written by John Ioannidis 988768458SSam Leffler * for BSD/OS in Athens, Greece, in November 1995. 1088768458SSam Leffler * 1188768458SSam Leffler * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 1288768458SSam Leffler * by Angelos D. Keromytis. 1388768458SSam Leffler * 1488768458SSam Leffler * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 1588768458SSam Leffler * and Niels Provos. 1688768458SSam Leffler * 1788768458SSam Leffler * Additional features in 1999 by Angelos D. Keromytis. 1888768458SSam Leffler * 1988768458SSam Leffler * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 2088768458SSam Leffler * Angelos D. Keromytis and Niels Provos. 2188768458SSam Leffler * Copyright (c) 2001 Angelos D. Keromytis. 2288768458SSam Leffler * 2388768458SSam Leffler * Permission to use, copy, and modify this software with or without fee 2488768458SSam Leffler * is hereby granted, provided that this entire notice is included in 2588768458SSam Leffler * all copies of any software which is or includes a copy or 2688768458SSam Leffler * modification of this software. 2788768458SSam Leffler * You may use this code under the GNU public license if you so wish. Please 2888768458SSam Leffler * contribute changes back to the authors under this freer than GPL license 2988768458SSam Leffler * so that we may further the use of strong encryption without limitations to 3088768458SSam Leffler * all. 3188768458SSam Leffler * 3288768458SSam Leffler * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 3388768458SSam Leffler * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 3488768458SSam Leffler * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 3588768458SSam Leffler * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 3688768458SSam Leffler * PURPOSE. 3788768458SSam Leffler */ 3888768458SSam Leffler #include "opt_inet.h" 3988768458SSam Leffler #include "opt_inet6.h" 4088768458SSam Leffler 4188768458SSam Leffler #include <sys/param.h> 4288768458SSam Leffler #include <sys/systm.h> 4388768458SSam Leffler #include <sys/mbuf.h> 4488768458SSam Leffler #include <sys/socket.h> 4588768458SSam Leffler #include <sys/syslog.h> 4688768458SSam Leffler #include <sys/kernel.h> 47eedc7fd9SGleb Smirnoff #include <sys/lock.h> 4888768458SSam Leffler #include <sys/random.h> 49eedc7fd9SGleb Smirnoff #include <sys/rwlock.h> 5088768458SSam Leffler #include <sys/sysctl.h> 51a2bc81bfSJohn-Mark Gurney #include <sys/mutex.h> 52a2bc81bfSJohn-Mark Gurney #include <machine/atomic.h> 5388768458SSam Leffler 5488768458SSam Leffler #include <net/if.h> 55eddfbb76SRobert Watson #include <net/vnet.h> 5688768458SSam Leffler 5788768458SSam Leffler #include <netinet/in.h> 5888768458SSam Leffler #include <netinet/in_systm.h> 5988768458SSam Leffler #include <netinet/ip.h> 6088768458SSam Leffler #include <netinet/ip_ecn.h> 6188768458SSam Leffler #include <netinet/ip6.h> 6288768458SSam Leffler 6388768458SSam Leffler #include <netipsec/ipsec.h> 6488768458SSam Leffler #include <netipsec/ah.h> 6588768458SSam Leffler #include <netipsec/ah_var.h> 6688768458SSam Leffler #include <netipsec/esp.h> 6788768458SSam Leffler #include <netipsec/esp_var.h> 6888768458SSam Leffler #include <netipsec/xform.h> 6988768458SSam Leffler 7088768458SSam Leffler #ifdef INET6 7188768458SSam Leffler #include <netinet6/ip6_var.h> 7288768458SSam Leffler #include <netipsec/ipsec6.h> 7388768458SSam Leffler #include <netinet6/ip6_ecn.h> 7488768458SSam Leffler #endif 7588768458SSam Leffler 7688768458SSam Leffler #include <netipsec/key.h> 7788768458SSam Leffler #include <netipsec/key_debug.h> 7888768458SSam Leffler 7988768458SSam Leffler #include <opencrypto/cryptodev.h> 8088768458SSam Leffler #include <opencrypto/xform.h> 8188768458SSam Leffler 82eddfbb76SRobert Watson VNET_DEFINE(int, esp_enable) = 1; 83db8c0879SAndrey V. Elsukov VNET_PCPUSTAT_DEFINE(struct espstat, espstat); 84db8c0879SAndrey V. Elsukov VNET_PCPUSTAT_SYSINIT(espstat); 85db8c0879SAndrey V. Elsukov 86db8c0879SAndrey V. Elsukov #ifdef VIMAGE 87db8c0879SAndrey V. Elsukov VNET_PCPUSTAT_SYSUNINIT(espstat); 88db8c0879SAndrey V. Elsukov #endif /* VIMAGE */ 8988768458SSam Leffler 9088768458SSam Leffler SYSCTL_DECL(_net_inet_esp); 916df8a710SGleb Smirnoff SYSCTL_INT(_net_inet_esp, OID_AUTO, esp_enable, 926df8a710SGleb Smirnoff CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(esp_enable), 0, ""); 93db8c0879SAndrey V. Elsukov SYSCTL_VNET_PCPUSTAT(_net_inet_esp, IPSECCTL_STATS, stats, 94db8c0879SAndrey V. Elsukov struct espstat, espstat, 95db8c0879SAndrey V. Elsukov "ESP statistics (struct espstat, netipsec/esp_var.h"); 96eddfbb76SRobert Watson 9788768458SSam Leffler static int esp_input_cb(struct cryptop *op); 9888768458SSam Leffler static int esp_output_cb(struct cryptop *crp); 99bfe1aba4SMarko Zec 10088768458SSam Leffler /* 10188768458SSam Leffler * NB: this is public for use by the PF_KEY support. 10288768458SSam Leffler * NB: if you add support here; be sure to add code to esp_attach below! 10388768458SSam Leffler */ 10488768458SSam Leffler struct enc_xform * 10588768458SSam Leffler esp_algorithm_lookup(int alg) 10688768458SSam Leffler { 10788768458SSam Leffler if (alg >= ESP_ALG_MAX) 10888768458SSam Leffler return NULL; 10988768458SSam Leffler switch (alg) { 11088768458SSam Leffler case SADB_EALG_DESCBC: 11188768458SSam Leffler return &enc_xform_des; 11288768458SSam Leffler case SADB_EALG_3DESCBC: 11388768458SSam Leffler return &enc_xform_3des; 11488768458SSam Leffler case SADB_X_EALG_AES: 11588768458SSam Leffler return &enc_xform_rijndael128; 11688768458SSam Leffler case SADB_X_EALG_BLOWFISHCBC: 11788768458SSam Leffler return &enc_xform_blf; 11888768458SSam Leffler case SADB_X_EALG_CAST128CBC: 11988768458SSam Leffler return &enc_xform_cast5; 12088768458SSam Leffler case SADB_EALG_NULL: 12188768458SSam Leffler return &enc_xform_null; 122559d3390SGeorge V. Neville-Neil case SADB_X_EALG_CAMELLIACBC: 123559d3390SGeorge V. Neville-Neil return &enc_xform_camellia; 12416de9ac1SGeorge V. Neville-Neil case SADB_X_EALG_AESCTR: 12516de9ac1SGeorge V. Neville-Neil return &enc_xform_aes_icm; 12616de9ac1SGeorge V. Neville-Neil case SADB_X_EALG_AESGCM16: 12716de9ac1SGeorge V. Neville-Neil return &enc_xform_aes_nist_gcm; 12816de9ac1SGeorge V. Neville-Neil case SADB_X_EALG_AESGMAC: 12916de9ac1SGeorge V. Neville-Neil return &enc_xform_aes_nist_gmac; 13088768458SSam Leffler } 13188768458SSam Leffler return NULL; 13288768458SSam Leffler } 13388768458SSam Leffler 13488768458SSam Leffler size_t 13588768458SSam Leffler esp_hdrsiz(struct secasvar *sav) 13688768458SSam Leffler { 13788768458SSam Leffler size_t size; 13888768458SSam Leffler 13988768458SSam Leffler if (sav != NULL) { 14088768458SSam Leffler /*XXX not right for null algorithm--does it matter??*/ 1419ffa9677SSam Leffler IPSEC_ASSERT(sav->tdb_encalgxform != NULL, 1429ffa9677SSam Leffler ("SA with null xform")); 14388768458SSam Leffler if (sav->flags & SADB_X_EXT_OLD) 14488768458SSam Leffler size = sizeof (struct esp); 14588768458SSam Leffler else 14688768458SSam Leffler size = sizeof (struct newesp); 14788768458SSam Leffler size += sav->tdb_encalgxform->blocksize + 9; 14888768458SSam Leffler /*XXX need alg check???*/ 14988768458SSam Leffler if (sav->tdb_authalgxform != NULL && sav->replay) 15088768458SSam Leffler size += ah_hdrsiz(sav); 15188768458SSam Leffler } else { 15288768458SSam Leffler /* 15388768458SSam Leffler * base header size 15488768458SSam Leffler * + max iv length for CBC mode 15588768458SSam Leffler * + max pad length 15688768458SSam Leffler * + sizeof (pad length field) 15788768458SSam Leffler * + sizeof (next header field) 15888768458SSam Leffler * + max icv supported. 15988768458SSam Leffler */ 160cdb7ebe3SPawel Jakub Dawidek size = sizeof (struct newesp) + EALG_MAX_BLOCK_LEN + 9 + 16; 16188768458SSam Leffler } 16288768458SSam Leffler return size; 16388768458SSam Leffler } 16488768458SSam Leffler 16588768458SSam Leffler /* 16688768458SSam Leffler * esp_init() is called when an SPI is being set up. 16788768458SSam Leffler */ 16888768458SSam Leffler static int 16988768458SSam Leffler esp_init(struct secasvar *sav, struct xformsw *xsp) 17088768458SSam Leffler { 17188768458SSam Leffler struct enc_xform *txform; 17288768458SSam Leffler struct cryptoini cria, crie; 17388768458SSam Leffler int keylen; 17488768458SSam Leffler int error; 17588768458SSam Leffler 17688768458SSam Leffler txform = esp_algorithm_lookup(sav->alg_enc); 17788768458SSam Leffler if (txform == NULL) { 1789ffa9677SSam Leffler DPRINTF(("%s: unsupported encryption algorithm %d\n", 1799ffa9677SSam Leffler __func__, sav->alg_enc)); 18088768458SSam Leffler return EINVAL; 18188768458SSam Leffler } 18288768458SSam Leffler if (sav->key_enc == NULL) { 1839ffa9677SSam Leffler DPRINTF(("%s: no encoding key for %s algorithm\n", 1849ffa9677SSam Leffler __func__, txform->name)); 18588768458SSam Leffler return EINVAL; 18688768458SSam Leffler } 187a2bc81bfSJohn-Mark Gurney if ((sav->flags & (SADB_X_EXT_OLD | SADB_X_EXT_IV4B)) == 188a2bc81bfSJohn-Mark Gurney SADB_X_EXT_IV4B) { 1899ffa9677SSam Leffler DPRINTF(("%s: 4-byte IV not supported with protocol\n", 1909ffa9677SSam Leffler __func__)); 19188768458SSam Leffler return EINVAL; 19288768458SSam Leffler } 193a2bc81bfSJohn-Mark Gurney /* subtract off the salt, RFC4106, 8.1 and RFC3686, 5.1 */ 194a2bc81bfSJohn-Mark Gurney keylen = _KEYLEN(sav->key_enc) - SAV_ISCTRORGCM(sav) * 4; 19588768458SSam Leffler if (txform->minkey > keylen || keylen > txform->maxkey) { 1969ffa9677SSam Leffler DPRINTF(("%s: invalid key length %u, must be in the range " 1979ffa9677SSam Leffler "[%u..%u] for algorithm %s\n", __func__, 19888768458SSam Leffler keylen, txform->minkey, txform->maxkey, 19988768458SSam Leffler txform->name)); 20088768458SSam Leffler return EINVAL; 20188768458SSam Leffler } 20288768458SSam Leffler 203a2bc81bfSJohn-Mark Gurney if (SAV_ISCTRORGCM(sav)) 204a2bc81bfSJohn-Mark Gurney sav->ivlen = 8; /* RFC4106 3.1 and RFC3686 3.1 */ 205a2bc81bfSJohn-Mark Gurney else 206*0c80e7dfSAndrey V. Elsukov sav->ivlen = txform->ivsize; 20788768458SSam Leffler 20888768458SSam Leffler /* 20988768458SSam Leffler * Setup AH-related state. 21088768458SSam Leffler */ 21188768458SSam Leffler if (sav->alg_auth != 0) { 21288768458SSam Leffler error = ah_init0(sav, xsp, &cria); 21388768458SSam Leffler if (error) 21488768458SSam Leffler return error; 21588768458SSam Leffler } 21688768458SSam Leffler 21788768458SSam Leffler /* NB: override anything set in ah_init0 */ 21888768458SSam Leffler sav->tdb_xform = xsp; 21988768458SSam Leffler sav->tdb_encalgxform = txform; 22088768458SSam Leffler 22116de9ac1SGeorge V. Neville-Neil /* 22216de9ac1SGeorge V. Neville-Neil * Whenever AES-GCM is used for encryption, one 22316de9ac1SGeorge V. Neville-Neil * of the AES authentication algorithms is chosen 22416de9ac1SGeorge V. Neville-Neil * as well, based on the key size. 22516de9ac1SGeorge V. Neville-Neil */ 22616de9ac1SGeorge V. Neville-Neil if (sav->alg_enc == SADB_X_EALG_AESGCM16) { 22716de9ac1SGeorge V. Neville-Neil switch (keylen) { 228a2bc81bfSJohn-Mark Gurney case AES_128_GMAC_KEY_LEN: 22916de9ac1SGeorge V. Neville-Neil sav->alg_auth = SADB_X_AALG_AES128GMAC; 23016de9ac1SGeorge V. Neville-Neil sav->tdb_authalgxform = &auth_hash_nist_gmac_aes_128; 23116de9ac1SGeorge V. Neville-Neil break; 232a2bc81bfSJohn-Mark Gurney case AES_192_GMAC_KEY_LEN: 23316de9ac1SGeorge V. Neville-Neil sav->alg_auth = SADB_X_AALG_AES192GMAC; 23416de9ac1SGeorge V. Neville-Neil sav->tdb_authalgxform = &auth_hash_nist_gmac_aes_192; 23516de9ac1SGeorge V. Neville-Neil break; 236a2bc81bfSJohn-Mark Gurney case AES_256_GMAC_KEY_LEN: 23716de9ac1SGeorge V. Neville-Neil sav->alg_auth = SADB_X_AALG_AES256GMAC; 23816de9ac1SGeorge V. Neville-Neil sav->tdb_authalgxform = &auth_hash_nist_gmac_aes_256; 23916de9ac1SGeorge V. Neville-Neil break; 24016de9ac1SGeorge V. Neville-Neil default: 24116de9ac1SGeorge V. Neville-Neil DPRINTF(("%s: invalid key length %u" 24216de9ac1SGeorge V. Neville-Neil "for algorithm %s\n", __func__, 24316de9ac1SGeorge V. Neville-Neil keylen, txform->name)); 24416de9ac1SGeorge V. Neville-Neil return EINVAL; 24516de9ac1SGeorge V. Neville-Neil } 24616de9ac1SGeorge V. Neville-Neil bzero(&cria, sizeof(cria)); 24716de9ac1SGeorge V. Neville-Neil cria.cri_alg = sav->tdb_authalgxform->type; 24816de9ac1SGeorge V. Neville-Neil cria.cri_key = sav->key_enc->key_data; 249a2bc81bfSJohn-Mark Gurney cria.cri_klen = _KEYBITS(sav->key_enc) - SAV_ISGCM(sav) * 32; 25016de9ac1SGeorge V. Neville-Neil } 25116de9ac1SGeorge V. Neville-Neil 25288768458SSam Leffler /* Initialize crypto session. */ 25388768458SSam Leffler bzero(&crie, sizeof(crie)); 25488768458SSam Leffler crie.cri_alg = sav->tdb_encalgxform->type; 255a0196c3cSGeorge V. Neville-Neil crie.cri_key = sav->key_enc->key_data; 256a2bc81bfSJohn-Mark Gurney crie.cri_klen = _KEYBITS(sav->key_enc) - SAV_ISCTRORGCM(sav) * 32; 25788768458SSam Leffler 25888768458SSam Leffler if (sav->tdb_authalgxform && sav->tdb_encalgxform) { 25988768458SSam Leffler /* init both auth & enc */ 26088768458SSam Leffler crie.cri_next = &cria; 26188768458SSam Leffler error = crypto_newsession(&sav->tdb_cryptoid, 262603724d3SBjoern A. Zeeb &crie, V_crypto_support); 26388768458SSam Leffler } else if (sav->tdb_encalgxform) { 26488768458SSam Leffler error = crypto_newsession(&sav->tdb_cryptoid, 265603724d3SBjoern A. Zeeb &crie, V_crypto_support); 26688768458SSam Leffler } else if (sav->tdb_authalgxform) { 26788768458SSam Leffler error = crypto_newsession(&sav->tdb_cryptoid, 268603724d3SBjoern A. Zeeb &cria, V_crypto_support); 26988768458SSam Leffler } else { 27088768458SSam Leffler /* XXX cannot happen? */ 2719ffa9677SSam Leffler DPRINTF(("%s: no encoding OR authentication xform!\n", 2729ffa9677SSam Leffler __func__)); 27388768458SSam Leffler error = EINVAL; 27488768458SSam Leffler } 27588768458SSam Leffler return error; 27688768458SSam Leffler } 27788768458SSam Leffler 27888768458SSam Leffler /* 27988768458SSam Leffler * Paranoia. 28088768458SSam Leffler */ 28188768458SSam Leffler static int 28288768458SSam Leffler esp_zeroize(struct secasvar *sav) 28388768458SSam Leffler { 28488768458SSam Leffler /* NB: ah_zerorize free's the crypto session state */ 28588768458SSam Leffler int error = ah_zeroize(sav); 28688768458SSam Leffler 28788768458SSam Leffler if (sav->key_enc) 288a0196c3cSGeorge V. Neville-Neil bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 28988768458SSam Leffler sav->tdb_encalgxform = NULL; 29088768458SSam Leffler sav->tdb_xform = NULL; 29188768458SSam Leffler return error; 29288768458SSam Leffler } 29388768458SSam Leffler 29488768458SSam Leffler /* 29588768458SSam Leffler * ESP input processing, called (eventually) through the protocol switch. 29688768458SSam Leffler */ 29788768458SSam Leffler static int 29888768458SSam Leffler esp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 29988768458SSam Leffler { 300962ac6c7SAndrey V. Elsukov char buf[128]; 30188768458SSam Leffler struct auth_hash *esph; 30288768458SSam Leffler struct enc_xform *espx; 30388768458SSam Leffler struct tdb_crypto *tc; 304a2bc81bfSJohn-Mark Gurney uint8_t *ivp; 30588768458SSam Leffler int plen, alen, hlen; 30688768458SSam Leffler struct newesp *esp; 30788768458SSam Leffler struct cryptodesc *crde; 30888768458SSam Leffler struct cryptop *crp; 30988768458SSam Leffler 3109ffa9677SSam Leffler IPSEC_ASSERT(sav != NULL, ("null SA")); 3119ffa9677SSam Leffler IPSEC_ASSERT(sav->tdb_encalgxform != NULL, ("null encoding xform")); 312a45bff04SVANHULLEBUS Yvan 313a45bff04SVANHULLEBUS Yvan /* Valid IP Packet length ? */ 314a45bff04SVANHULLEBUS Yvan if ( (skip&3) || (m->m_pkthdr.len&3) ){ 315a45bff04SVANHULLEBUS Yvan DPRINTF(("%s: misaligned packet, skip %u pkt len %u", 316a45bff04SVANHULLEBUS Yvan __func__, skip, m->m_pkthdr.len)); 317a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_badilen); 318a45bff04SVANHULLEBUS Yvan m_freem(m); 319a45bff04SVANHULLEBUS Yvan return EINVAL; 320a45bff04SVANHULLEBUS Yvan } 32188768458SSam Leffler /* XXX don't pullup, just copy header */ 32288768458SSam Leffler IP6_EXTHDR_GET(esp, struct newesp *, m, skip, sizeof (struct newesp)); 32388768458SSam Leffler 32488768458SSam Leffler esph = sav->tdb_authalgxform; 32588768458SSam Leffler espx = sav->tdb_encalgxform; 32688768458SSam Leffler 327a09a7146SJohn-Mark Gurney /* Determine the ESP header and auth length */ 32888768458SSam Leffler if (sav->flags & SADB_X_EXT_OLD) 32988768458SSam Leffler hlen = sizeof (struct esp) + sav->ivlen; 33088768458SSam Leffler else 33188768458SSam Leffler hlen = sizeof (struct newesp) + sav->ivlen; 332a09a7146SJohn-Mark Gurney 333a09a7146SJohn-Mark Gurney alen = xform_ah_authsize(esph); 33488768458SSam Leffler 33588768458SSam Leffler /* 33688768458SSam Leffler * Verify payload length is multiple of encryption algorithm 33788768458SSam Leffler * block size. 33888768458SSam Leffler * 33988768458SSam Leffler * NB: This works for the null algorithm because the blocksize 34088768458SSam Leffler * is 4 and all packets must be 4-byte aligned regardless 34188768458SSam Leffler * of the algorithm. 34288768458SSam Leffler */ 34388768458SSam Leffler plen = m->m_pkthdr.len - (skip + hlen + alen); 34488768458SSam Leffler if ((plen & (espx->blocksize - 1)) || (plen <= 0)) { 3459ffa9677SSam Leffler DPRINTF(("%s: payload of %d octets not a multiple of %d octets," 346a2bc81bfSJohn-Mark Gurney " SA %s/%08lx\n", __func__, plen, espx->blocksize, 347a2bc81bfSJohn-Mark Gurney ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 348a2bc81bfSJohn-Mark Gurney (u_long)ntohl(sav->spi))); 349a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_badilen); 35088768458SSam Leffler m_freem(m); 35188768458SSam Leffler return EINVAL; 35288768458SSam Leffler } 35388768458SSam Leffler 35488768458SSam Leffler /* 35588768458SSam Leffler * Check sequence number. 35688768458SSam Leffler */ 35708537f45SAndrey V. Elsukov if (esph != NULL && sav->replay != NULL && 35808537f45SAndrey V. Elsukov !ipsec_chkreplay(ntohl(esp->esp_seq), sav)) { 3599ffa9677SSam Leffler DPRINTF(("%s: packet replay check for %s\n", __func__, 360962ac6c7SAndrey V. Elsukov ipsec_logsastr(sav, buf, sizeof(buf)))); /*XXX*/ 361a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_replay); 36288768458SSam Leffler m_freem(m); 36388768458SSam Leffler return ENOBUFS; /*XXX*/ 36488768458SSam Leffler } 36588768458SSam Leffler 36688768458SSam Leffler /* Update the counters */ 367a04d64d8SAndrey V. Elsukov ESPSTAT_ADD(esps_ibytes, m->m_pkthdr.len - (skip + hlen + alen)); 36888768458SSam Leffler 36988768458SSam Leffler /* Get crypto descriptors */ 37088768458SSam Leffler crp = crypto_getreq(esph && espx ? 2 : 1); 37188768458SSam Leffler if (crp == NULL) { 3729ffa9677SSam Leffler DPRINTF(("%s: failed to acquire crypto descriptors\n", 3739ffa9677SSam Leffler __func__)); 374a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_crypto); 37588768458SSam Leffler m_freem(m); 37688768458SSam Leffler return ENOBUFS; 37788768458SSam Leffler } 37888768458SSam Leffler 37988768458SSam Leffler /* Get IPsec-specific opaque pointer */ 38088768458SSam Leffler tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto) + alen, 38188768458SSam Leffler M_XDATA, M_NOWAIT | M_ZERO); 38288768458SSam Leffler if (tc == NULL) { 38388768458SSam Leffler crypto_freereq(crp); 3849ffa9677SSam Leffler DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 385a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_crypto); 38688768458SSam Leffler m_freem(m); 38788768458SSam Leffler return ENOBUFS; 38888768458SSam Leffler } 38988768458SSam Leffler 39008537f45SAndrey V. Elsukov if (esph != NULL) { 39188768458SSam Leffler struct cryptodesc *crda = crp->crp_desc; 39288768458SSam Leffler 3939ffa9677SSam Leffler IPSEC_ASSERT(crda != NULL, ("null ah crypto descriptor")); 39488768458SSam Leffler 39588768458SSam Leffler /* Authentication descriptor */ 39688768458SSam Leffler crda->crd_skip = skip; 397a2bc81bfSJohn-Mark Gurney if (SAV_ISGCM(sav)) 398a2bc81bfSJohn-Mark Gurney crda->crd_len = 8; /* RFC4106 5, SPI + SN */ 39916de9ac1SGeorge V. Neville-Neil else 40088768458SSam Leffler crda->crd_len = m->m_pkthdr.len - (skip + alen); 40188768458SSam Leffler crda->crd_inject = m->m_pkthdr.len - alen; 40288768458SSam Leffler 40388768458SSam Leffler crda->crd_alg = esph->type; 40488768458SSam Leffler 40588768458SSam Leffler /* Copy the authenticator */ 40688768458SSam Leffler m_copydata(m, m->m_pkthdr.len - alen, alen, 40788768458SSam Leffler (caddr_t) (tc + 1)); 40888768458SSam Leffler 40988768458SSam Leffler /* Chain authentication request */ 41088768458SSam Leffler crde = crda->crd_next; 41188768458SSam Leffler } else { 41288768458SSam Leffler crde = crp->crp_desc; 41388768458SSam Leffler } 41488768458SSam Leffler 41588768458SSam Leffler /* Crypto operation descriptor */ 41688768458SSam Leffler crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 417d8409aafSSam Leffler crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 41888768458SSam Leffler crp->crp_buf = (caddr_t) m; 41988768458SSam Leffler crp->crp_callback = esp_input_cb; 42088768458SSam Leffler crp->crp_sid = sav->tdb_cryptoid; 42188768458SSam Leffler crp->crp_opaque = (caddr_t) tc; 42288768458SSam Leffler 42388768458SSam Leffler /* These are passed as-is to the callback */ 42488768458SSam Leffler tc->tc_spi = sav->spi; 42588768458SSam Leffler tc->tc_dst = sav->sah->saidx.dst; 42688768458SSam Leffler tc->tc_proto = sav->sah->saidx.proto; 42788768458SSam Leffler tc->tc_protoff = protoff; 42888768458SSam Leffler tc->tc_skip = skip; 42973171433SFabien Thomas KEY_ADDREFSA(sav); 43073171433SFabien Thomas tc->tc_sav = sav; 43188768458SSam Leffler 43288768458SSam Leffler /* Decryption descriptor */ 4339ffa9677SSam Leffler IPSEC_ASSERT(crde != NULL, ("null esp crypto descriptor")); 43488768458SSam Leffler crde->crd_skip = skip + hlen; 43588768458SSam Leffler crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen); 43688768458SSam Leffler crde->crd_inject = skip + hlen - sav->ivlen; 43788768458SSam Leffler 438a2bc81bfSJohn-Mark Gurney if (SAV_ISCTRORGCM(sav)) { 439a2bc81bfSJohn-Mark Gurney ivp = &crde->crd_iv[0]; 44016de9ac1SGeorge V. Neville-Neil 441a2bc81bfSJohn-Mark Gurney /* GCM IV Format: RFC4106 4 */ 442a2bc81bfSJohn-Mark Gurney /* CTR IV Format: RFC3686 4 */ 443a2bc81bfSJohn-Mark Gurney /* Salt is last four bytes of key, RFC4106 8.1 */ 444a2bc81bfSJohn-Mark Gurney /* Nonce is last four bytes of key, RFC3686 5.1 */ 445a2bc81bfSJohn-Mark Gurney memcpy(ivp, sav->key_enc->key_data + 446a2bc81bfSJohn-Mark Gurney _KEYLEN(sav->key_enc) - 4, 4); 447a2bc81bfSJohn-Mark Gurney 448a2bc81bfSJohn-Mark Gurney if (SAV_ISCTR(sav)) { 449a2bc81bfSJohn-Mark Gurney /* Initial block counter is 1, RFC3686 4 */ 450a2bc81bfSJohn-Mark Gurney be32enc(&ivp[sav->ivlen + 4], 1); 451a2bc81bfSJohn-Mark Gurney } 452a2bc81bfSJohn-Mark Gurney 453a2bc81bfSJohn-Mark Gurney m_copydata(m, skip + hlen - sav->ivlen, sav->ivlen, &ivp[4]); 454a2bc81bfSJohn-Mark Gurney crde->crd_flags |= CRD_F_IV_EXPLICIT; 455a2bc81bfSJohn-Mark Gurney } 456a2bc81bfSJohn-Mark Gurney 457a2bc81bfSJohn-Mark Gurney crde->crd_alg = espx->type; 45888768458SSam Leffler 45908537f45SAndrey V. Elsukov return (crypto_dispatch(crp)); 46088768458SSam Leffler } 46188768458SSam Leffler 46288768458SSam Leffler /* 46388768458SSam Leffler * ESP input callback from the crypto driver. 46488768458SSam Leffler */ 46588768458SSam Leffler static int 46688768458SSam Leffler esp_input_cb(struct cryptop *crp) 46788768458SSam Leffler { 468962ac6c7SAndrey V. Elsukov char buf[128]; 469442da28aSVANHULLEBUS Yvan u_int8_t lastthree[3], aalg[AH_HMAC_MAXHASHLEN]; 470442da28aSVANHULLEBUS Yvan int hlen, skip, protoff, error, alen; 47188768458SSam Leffler struct mbuf *m; 47288768458SSam Leffler struct cryptodesc *crd; 47388768458SSam Leffler struct auth_hash *esph; 47488768458SSam Leffler struct enc_xform *espx; 47588768458SSam Leffler struct tdb_crypto *tc; 47688768458SSam Leffler struct secasvar *sav; 47788768458SSam Leffler struct secasindex *saidx; 47888768458SSam Leffler caddr_t ptr; 47988768458SSam Leffler 48088768458SSam Leffler crd = crp->crp_desc; 4819ffa9677SSam Leffler IPSEC_ASSERT(crd != NULL, ("null crypto descriptor!")); 48288768458SSam Leffler 48388768458SSam Leffler tc = (struct tdb_crypto *) crp->crp_opaque; 4849ffa9677SSam Leffler IPSEC_ASSERT(tc != NULL, ("null opaque crypto data area!")); 48588768458SSam Leffler skip = tc->tc_skip; 48688768458SSam Leffler protoff = tc->tc_protoff; 48788768458SSam Leffler m = (struct mbuf *) crp->crp_buf; 48888768458SSam Leffler 48973171433SFabien Thomas sav = tc->tc_sav; 49073171433SFabien Thomas IPSEC_ASSERT(sav != NULL, ("null SA!")); 49188768458SSam Leffler 49288768458SSam Leffler saidx = &sav->sah->saidx; 4939ffa9677SSam Leffler IPSEC_ASSERT(saidx->dst.sa.sa_family == AF_INET || 49488768458SSam Leffler saidx->dst.sa.sa_family == AF_INET6, 4959ffa9677SSam Leffler ("unexpected protocol family %u", saidx->dst.sa.sa_family)); 49688768458SSam Leffler 49788768458SSam Leffler esph = sav->tdb_authalgxform; 49888768458SSam Leffler espx = sav->tdb_encalgxform; 49988768458SSam Leffler 50088768458SSam Leffler /* Check for crypto errors */ 50188768458SSam Leffler if (crp->crp_etype) { 50288768458SSam Leffler /* Reset the session ID */ 50388768458SSam Leffler if (sav->tdb_cryptoid != 0) 50488768458SSam Leffler sav->tdb_cryptoid = crp->crp_sid; 50588768458SSam Leffler 5060a95a08eSPawel Jakub Dawidek if (crp->crp_etype == EAGAIN) 5070a95a08eSPawel Jakub Dawidek return (crypto_dispatch(crp)); 50888768458SSam Leffler 509a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_noxform); 5109ffa9677SSam Leffler DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 51188768458SSam Leffler error = crp->crp_etype; 51288768458SSam Leffler goto bad; 51388768458SSam Leffler } 51488768458SSam Leffler 51588768458SSam Leffler /* Shouldn't happen... */ 51688768458SSam Leffler if (m == NULL) { 517a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_crypto); 5189ffa9677SSam Leffler DPRINTF(("%s: bogus returned buffer from crypto\n", __func__)); 51988768458SSam Leffler error = EINVAL; 52088768458SSam Leffler goto bad; 52188768458SSam Leffler } 522a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_hist[sav->alg_enc]); 52388768458SSam Leffler 52488768458SSam Leffler /* If authentication was performed, check now. */ 52588768458SSam Leffler if (esph != NULL) { 526a09a7146SJohn-Mark Gurney alen = xform_ah_authsize(esph); 527a04d64d8SAndrey V. Elsukov AHSTAT_INC(ahs_hist[sav->alg_auth]); 52888768458SSam Leffler /* Copy the authenticator from the packet */ 52908537f45SAndrey V. Elsukov m_copydata(m, m->m_pkthdr.len - alen, alen, aalg); 53088768458SSam Leffler ptr = (caddr_t) (tc + 1); 53188768458SSam Leffler 53288768458SSam Leffler /* Verify authenticator */ 53342e5fcbfSJohn-Mark Gurney if (timingsafe_bcmp(ptr, aalg, alen) != 0) { 53408537f45SAndrey V. Elsukov DPRINTF(("%s: authentication hash mismatch for " 53508537f45SAndrey V. Elsukov "packet in SA %s/%08lx\n", __func__, 536962ac6c7SAndrey V. Elsukov ipsec_address(&saidx->dst, buf, sizeof(buf)), 53788768458SSam Leffler (u_long) ntohl(sav->spi))); 538a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_badauth); 53988768458SSam Leffler error = EACCES; 54088768458SSam Leffler goto bad; 54188768458SSam Leffler } 54288768458SSam Leffler 54388768458SSam Leffler /* Remove trailing authenticator */ 544442da28aSVANHULLEBUS Yvan m_adj(m, -alen); 54588768458SSam Leffler } 54688768458SSam Leffler 54788768458SSam Leffler /* Release the crypto descriptors */ 54888768458SSam Leffler free(tc, M_XDATA), tc = NULL; 54988768458SSam Leffler crypto_freereq(crp), crp = NULL; 55088768458SSam Leffler 55188768458SSam Leffler /* 55288768458SSam Leffler * Packet is now decrypted. 55388768458SSam Leffler */ 55488768458SSam Leffler m->m_flags |= M_DECRYPTED; 55588768458SSam Leffler 556d16f6f50SColin Percival /* 557d16f6f50SColin Percival * Update replay sequence number, if appropriate. 558d16f6f50SColin Percival */ 559d16f6f50SColin Percival if (sav->replay) { 560d16f6f50SColin Percival u_int32_t seq; 561d16f6f50SColin Percival 562d16f6f50SColin Percival m_copydata(m, skip + offsetof(struct newesp, esp_seq), 563d16f6f50SColin Percival sizeof (seq), (caddr_t) &seq); 564d16f6f50SColin Percival if (ipsec_updatereplay(ntohl(seq), sav)) { 565d16f6f50SColin Percival DPRINTF(("%s: packet replay check for %s\n", __func__, 566962ac6c7SAndrey V. Elsukov ipsec_logsastr(sav, buf, sizeof(buf)))); 567a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_replay); 568d16f6f50SColin Percival error = ENOBUFS; 569d16f6f50SColin Percival goto bad; 570d16f6f50SColin Percival } 571d16f6f50SColin Percival } 572d16f6f50SColin Percival 57388768458SSam Leffler /* Determine the ESP header length */ 57488768458SSam Leffler if (sav->flags & SADB_X_EXT_OLD) 57588768458SSam Leffler hlen = sizeof (struct esp) + sav->ivlen; 57688768458SSam Leffler else 57788768458SSam Leffler hlen = sizeof (struct newesp) + sav->ivlen; 57888768458SSam Leffler 57988768458SSam Leffler /* Remove the ESP header and IV from the mbuf. */ 58088768458SSam Leffler error = m_striphdr(m, skip, hlen); 58188768458SSam Leffler if (error) { 582a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_hdrops); 5839ffa9677SSam Leffler DPRINTF(("%s: bad mbuf chain, SA %s/%08lx\n", __func__, 584962ac6c7SAndrey V. Elsukov ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 58588768458SSam Leffler (u_long) ntohl(sav->spi))); 58688768458SSam Leffler goto bad; 58788768458SSam Leffler } 58888768458SSam Leffler 58988768458SSam Leffler /* Save the last three bytes of decrypted data */ 59088768458SSam Leffler m_copydata(m, m->m_pkthdr.len - 3, 3, lastthree); 59188768458SSam Leffler 59288768458SSam Leffler /* Verify pad length */ 59388768458SSam Leffler if (lastthree[1] + 2 > m->m_pkthdr.len - skip) { 594a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_badilen); 5959ffa9677SSam Leffler DPRINTF(("%s: invalid padding length %d for %u byte packet " 596962ac6c7SAndrey V. Elsukov "in SA %s/%08lx\n", __func__, lastthree[1], 597962ac6c7SAndrey V. Elsukov m->m_pkthdr.len - skip, 598962ac6c7SAndrey V. Elsukov ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 59988768458SSam Leffler (u_long) ntohl(sav->spi))); 60088768458SSam Leffler error = EINVAL; 60188768458SSam Leffler goto bad; 60288768458SSam Leffler } 60388768458SSam Leffler 60488768458SSam Leffler /* Verify correct decryption by checking the last padding bytes */ 60588768458SSam Leffler if ((sav->flags & SADB_X_EXT_PMASK) != SADB_X_EXT_PRAND) { 60688768458SSam Leffler if (lastthree[1] != lastthree[0] && lastthree[1] != 0) { 607a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_badenc); 6089ffa9677SSam Leffler DPRINTF(("%s: decryption failed for packet in " 609962ac6c7SAndrey V. Elsukov "SA %s/%08lx\n", __func__, ipsec_address( 610962ac6c7SAndrey V. Elsukov &sav->sah->saidx.dst, buf, sizeof(buf)), 61188768458SSam Leffler (u_long) ntohl(sav->spi))); 61288768458SSam Leffler error = EINVAL; 61388768458SSam Leffler goto bad; 61488768458SSam Leffler } 61588768458SSam Leffler } 61688768458SSam Leffler 61788768458SSam Leffler /* Trim the mbuf chain to remove trailing authenticator and padding */ 61888768458SSam Leffler m_adj(m, -(lastthree[1] + 2)); 61988768458SSam Leffler 62088768458SSam Leffler /* Restore the Next Protocol field */ 62188768458SSam Leffler m_copyback(m, protoff, sizeof (u_int8_t), lastthree + 2); 62288768458SSam Leffler 623db178eb8SBjoern A. Zeeb switch (saidx->dst.sa.sa_family) { 624db178eb8SBjoern A. Zeeb #ifdef INET6 625db178eb8SBjoern A. Zeeb case AF_INET6: 626f0514a8bSAndrey V. Elsukov error = ipsec6_common_input_cb(m, sav, skip, protoff); 627db178eb8SBjoern A. Zeeb break; 628db178eb8SBjoern A. Zeeb #endif 629db178eb8SBjoern A. Zeeb #ifdef INET 630db178eb8SBjoern A. Zeeb case AF_INET: 631f0514a8bSAndrey V. Elsukov error = ipsec4_common_input_cb(m, sav, skip, protoff); 632db178eb8SBjoern A. Zeeb break; 633db178eb8SBjoern A. Zeeb #endif 634db178eb8SBjoern A. Zeeb default: 635db178eb8SBjoern A. Zeeb panic("%s: Unexpected address family: %d saidx=%p", __func__, 636db178eb8SBjoern A. Zeeb saidx->dst.sa.sa_family, saidx); 637db178eb8SBjoern A. Zeeb } 63888768458SSam Leffler 63988768458SSam Leffler KEY_FREESAV(&sav); 64088768458SSam Leffler return error; 64188768458SSam Leffler bad: 64288768458SSam Leffler if (sav) 64388768458SSam Leffler KEY_FREESAV(&sav); 64488768458SSam Leffler if (m != NULL) 64588768458SSam Leffler m_freem(m); 64688768458SSam Leffler if (tc != NULL) 64788768458SSam Leffler free(tc, M_XDATA); 64888768458SSam Leffler if (crp != NULL) 64988768458SSam Leffler crypto_freereq(crp); 65088768458SSam Leffler return error; 65188768458SSam Leffler } 65288768458SSam Leffler 65388768458SSam Leffler /* 65488768458SSam Leffler * ESP output routine, called by ipsec[46]_process_packet(). 65588768458SSam Leffler */ 65688768458SSam Leffler static int 657962ac6c7SAndrey V. Elsukov esp_output(struct mbuf *m, struct ipsecrequest *isr, struct mbuf **mp, 658962ac6c7SAndrey V. Elsukov int skip, int protoff) 65988768458SSam Leffler { 660962ac6c7SAndrey V. Elsukov char buf[INET6_ADDRSTRLEN]; 66188768458SSam Leffler struct enc_xform *espx; 66288768458SSam Leffler struct auth_hash *esph; 663a2bc81bfSJohn-Mark Gurney uint8_t *ivp; 664a2bc81bfSJohn-Mark Gurney uint64_t cntr; 665d3e8e66dSPawel Jakub Dawidek int hlen, rlen, padding, blks, alen, i, roff; 66688768458SSam Leffler struct mbuf *mo = (struct mbuf *) NULL; 66788768458SSam Leffler struct tdb_crypto *tc; 66888768458SSam Leffler struct secasvar *sav; 66988768458SSam Leffler struct secasindex *saidx; 67088768458SSam Leffler unsigned char *pad; 67188768458SSam Leffler u_int8_t prot; 67288768458SSam Leffler int error, maxpacketsize; 67388768458SSam Leffler 67488768458SSam Leffler struct cryptodesc *crde = NULL, *crda = NULL; 67588768458SSam Leffler struct cryptop *crp; 67688768458SSam Leffler 67788768458SSam Leffler sav = isr->sav; 6789ffa9677SSam Leffler IPSEC_ASSERT(sav != NULL, ("null SA")); 67988768458SSam Leffler esph = sav->tdb_authalgxform; 68088768458SSam Leffler espx = sav->tdb_encalgxform; 6819ffa9677SSam Leffler IPSEC_ASSERT(espx != NULL, ("null encoding xform")); 68288768458SSam Leffler 68388768458SSam Leffler if (sav->flags & SADB_X_EXT_OLD) 68488768458SSam Leffler hlen = sizeof (struct esp) + sav->ivlen; 68588768458SSam Leffler else 68688768458SSam Leffler hlen = sizeof (struct newesp) + sav->ivlen; 68788768458SSam Leffler 68888768458SSam Leffler rlen = m->m_pkthdr.len - skip; /* Raw payload length. */ 68988768458SSam Leffler /* 690a2bc81bfSJohn-Mark Gurney * RFC4303 2.4 Requires 4 byte alignment. 69188768458SSam Leffler */ 692a2bc81bfSJohn-Mark Gurney blks = MAX(4, espx->blocksize); /* Cipher blocksize */ 69388768458SSam Leffler 69488768458SSam Leffler /* XXX clamp padding length a la KAME??? */ 69588768458SSam Leffler padding = ((blks - ((rlen + 2) % blks)) % blks) + 2; 69688768458SSam Leffler 697a09a7146SJohn-Mark Gurney alen = xform_ah_authsize(esph); 69888768458SSam Leffler 699a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_output); 70088768458SSam Leffler 70188768458SSam Leffler saidx = &sav->sah->saidx; 70288768458SSam Leffler /* Check for maximum packet size violations. */ 70388768458SSam Leffler switch (saidx->dst.sa.sa_family) { 70488768458SSam Leffler #ifdef INET 70588768458SSam Leffler case AF_INET: 70688768458SSam Leffler maxpacketsize = IP_MAXPACKET; 70788768458SSam Leffler break; 70888768458SSam Leffler #endif /* INET */ 70988768458SSam Leffler #ifdef INET6 71088768458SSam Leffler case AF_INET6: 71188768458SSam Leffler maxpacketsize = IPV6_MAXPACKET; 71288768458SSam Leffler break; 71388768458SSam Leffler #endif /* INET6 */ 71488768458SSam Leffler default: 7159ffa9677SSam Leffler DPRINTF(("%s: unknown/unsupported protocol " 7169ffa9677SSam Leffler "family %d, SA %s/%08lx\n", __func__, 717962ac6c7SAndrey V. Elsukov saidx->dst.sa.sa_family, ipsec_address(&saidx->dst, 718962ac6c7SAndrey V. Elsukov buf, sizeof(buf)), (u_long) ntohl(sav->spi))); 719a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_nopf); 72088768458SSam Leffler error = EPFNOSUPPORT; 72188768458SSam Leffler goto bad; 72288768458SSam Leffler } 72316de9ac1SGeorge V. Neville-Neil DPRINTF(("%s: skip %d hlen %d rlen %d padding %d alen %d blksd %d\n", 72416de9ac1SGeorge V. Neville-Neil __func__, skip, hlen, rlen, padding, alen, blks)); 72588768458SSam Leffler if (skip + hlen + rlen + padding + alen > maxpacketsize) { 7269ffa9677SSam Leffler DPRINTF(("%s: packet in SA %s/%08lx got too big " 7279ffa9677SSam Leffler "(len %u, max len %u)\n", __func__, 728962ac6c7SAndrey V. Elsukov ipsec_address(&saidx->dst, buf, sizeof(buf)), 729962ac6c7SAndrey V. Elsukov (u_long) ntohl(sav->spi), 73088768458SSam Leffler skip + hlen + rlen + padding + alen, maxpacketsize)); 731a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_toobig); 73288768458SSam Leffler error = EMSGSIZE; 73388768458SSam Leffler goto bad; 73488768458SSam Leffler } 73588768458SSam Leffler 73688768458SSam Leffler /* Update the counters. */ 737a04d64d8SAndrey V. Elsukov ESPSTAT_ADD(esps_obytes, m->m_pkthdr.len - skip); 73888768458SSam Leffler 73947e2996eSSam Leffler m = m_unshare(m, M_NOWAIT); 74088768458SSam Leffler if (m == NULL) { 7419ffa9677SSam Leffler DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__, 742962ac6c7SAndrey V. Elsukov ipsec_address(&saidx->dst, buf, sizeof(buf)), 743962ac6c7SAndrey V. Elsukov (u_long) ntohl(sav->spi))); 744a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_hdrops); 74588768458SSam Leffler error = ENOBUFS; 74688768458SSam Leffler goto bad; 74788768458SSam Leffler } 74888768458SSam Leffler 74988768458SSam Leffler /* Inject ESP header. */ 75088768458SSam Leffler mo = m_makespace(m, skip, hlen, &roff); 75188768458SSam Leffler if (mo == NULL) { 7529ffa9677SSam Leffler DPRINTF(("%s: %u byte ESP hdr inject failed for SA %s/%08lx\n", 753962ac6c7SAndrey V. Elsukov __func__, hlen, ipsec_address(&saidx->dst, buf, 754962ac6c7SAndrey V. Elsukov sizeof(buf)), (u_long) ntohl(sav->spi))); 755a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_hdrops); /* XXX diffs from openbsd */ 75688768458SSam Leffler error = ENOBUFS; 75788768458SSam Leffler goto bad; 75888768458SSam Leffler } 75988768458SSam Leffler 76088768458SSam Leffler /* Initialize ESP header. */ 76188768458SSam Leffler bcopy((caddr_t) &sav->spi, mtod(mo, caddr_t) + roff, sizeof(u_int32_t)); 76288768458SSam Leffler if (sav->replay) { 763dfa9422bSPawel Jakub Dawidek u_int32_t replay; 764dfa9422bSPawel Jakub Dawidek 7656131838bSPawel Jakub Dawidek #ifdef REGRESSION 766dfa9422bSPawel Jakub Dawidek /* Emulate replay attack when ipsec_replay is TRUE. */ 767603724d3SBjoern A. Zeeb if (!V_ipsec_replay) 7686131838bSPawel Jakub Dawidek #endif 769dfa9422bSPawel Jakub Dawidek sav->replay->count++; 770dfa9422bSPawel Jakub Dawidek replay = htonl(sav->replay->count); 77188768458SSam Leffler bcopy((caddr_t) &replay, 77288768458SSam Leffler mtod(mo, caddr_t) + roff + sizeof(u_int32_t), 77388768458SSam Leffler sizeof(u_int32_t)); 77488768458SSam Leffler } 77588768458SSam Leffler 77688768458SSam Leffler /* 77788768458SSam Leffler * Add padding -- better to do it ourselves than use the crypto engine, 77888768458SSam Leffler * although if/when we support compression, we'd have to do that. 77988768458SSam Leffler */ 78088768458SSam Leffler pad = (u_char *) m_pad(m, padding + alen); 78188768458SSam Leffler if (pad == NULL) { 7829ffa9677SSam Leffler DPRINTF(("%s: m_pad failed for SA %s/%08lx\n", __func__, 783962ac6c7SAndrey V. Elsukov ipsec_address(&saidx->dst, buf, sizeof(buf)), 784962ac6c7SAndrey V. Elsukov (u_long) ntohl(sav->spi))); 78588768458SSam Leffler m = NULL; /* NB: free'd by m_pad */ 78688768458SSam Leffler error = ENOBUFS; 78788768458SSam Leffler goto bad; 78888768458SSam Leffler } 78988768458SSam Leffler 79088768458SSam Leffler /* 79188768458SSam Leffler * Add padding: random, zero, or self-describing. 79288768458SSam Leffler * XXX catch unexpected setting 79388768458SSam Leffler */ 79488768458SSam Leffler switch (sav->flags & SADB_X_EXT_PMASK) { 79588768458SSam Leffler case SADB_X_EXT_PRAND: 79688768458SSam Leffler (void) read_random(pad, padding - 2); 79788768458SSam Leffler break; 79888768458SSam Leffler case SADB_X_EXT_PZERO: 79988768458SSam Leffler bzero(pad, padding - 2); 80088768458SSam Leffler break; 80188768458SSam Leffler case SADB_X_EXT_PSEQ: 80288768458SSam Leffler for (i = 0; i < padding - 2; i++) 80388768458SSam Leffler pad[i] = i+1; 80488768458SSam Leffler break; 80588768458SSam Leffler } 80688768458SSam Leffler 80788768458SSam Leffler /* Fix padding length and Next Protocol in padding itself. */ 80888768458SSam Leffler pad[padding - 2] = padding - 2; 80988768458SSam Leffler m_copydata(m, protoff, sizeof(u_int8_t), pad + padding - 1); 81088768458SSam Leffler 81188768458SSam Leffler /* Fix Next Protocol in IPv4/IPv6 header. */ 81288768458SSam Leffler prot = IPPROTO_ESP; 81388768458SSam Leffler m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot); 81488768458SSam Leffler 81588768458SSam Leffler /* Get crypto descriptors. */ 816a2bc81bfSJohn-Mark Gurney crp = crypto_getreq(esph != NULL ? 2 : 1); 81788768458SSam Leffler if (crp == NULL) { 8189ffa9677SSam Leffler DPRINTF(("%s: failed to acquire crypto descriptors\n", 8199ffa9677SSam Leffler __func__)); 820a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_crypto); 82188768458SSam Leffler error = ENOBUFS; 82288768458SSam Leffler goto bad; 82388768458SSam Leffler } 82488768458SSam Leffler 825a2bc81bfSJohn-Mark Gurney /* IPsec-specific opaque crypto info. */ 826a2bc81bfSJohn-Mark Gurney tc = (struct tdb_crypto *) malloc(sizeof(struct tdb_crypto), 827a2bc81bfSJohn-Mark Gurney M_XDATA, M_NOWAIT|M_ZERO); 828a2bc81bfSJohn-Mark Gurney if (tc == NULL) { 829a2bc81bfSJohn-Mark Gurney crypto_freereq(crp); 830a2bc81bfSJohn-Mark Gurney DPRINTF(("%s: failed to allocate tdb_crypto\n", __func__)); 831a2bc81bfSJohn-Mark Gurney ESPSTAT_INC(esps_crypto); 832a2bc81bfSJohn-Mark Gurney error = ENOBUFS; 833a2bc81bfSJohn-Mark Gurney goto bad; 834a2bc81bfSJohn-Mark Gurney } 835a2bc81bfSJohn-Mark Gurney 83688768458SSam Leffler crde = crp->crp_desc; 83788768458SSam Leffler crda = crde->crd_next; 83888768458SSam Leffler 83988768458SSam Leffler /* Encryption descriptor. */ 84088768458SSam Leffler crde->crd_skip = skip + hlen; 84188768458SSam Leffler crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen); 84288768458SSam Leffler crde->crd_flags = CRD_F_ENCRYPT; 84388768458SSam Leffler crde->crd_inject = skip + hlen - sav->ivlen; 84488768458SSam Leffler 84588768458SSam Leffler /* Encryption operation. */ 84688768458SSam Leffler crde->crd_alg = espx->type; 847a2bc81bfSJohn-Mark Gurney if (SAV_ISCTRORGCM(sav)) { 848a2bc81bfSJohn-Mark Gurney ivp = &crde->crd_iv[0]; 84988768458SSam Leffler 850a2bc81bfSJohn-Mark Gurney /* GCM IV Format: RFC4106 4 */ 851a2bc81bfSJohn-Mark Gurney /* CTR IV Format: RFC3686 4 */ 852a2bc81bfSJohn-Mark Gurney /* Salt is last four bytes of key, RFC4106 8.1 */ 853a2bc81bfSJohn-Mark Gurney /* Nonce is last four bytes of key, RFC3686 5.1 */ 854a2bc81bfSJohn-Mark Gurney memcpy(ivp, sav->key_enc->key_data + 855a2bc81bfSJohn-Mark Gurney _KEYLEN(sav->key_enc) - 4, 4); 856a2bc81bfSJohn-Mark Gurney SECASVAR_LOCK(sav); 857a2bc81bfSJohn-Mark Gurney cntr = sav->cntr++; 858a2bc81bfSJohn-Mark Gurney SECASVAR_UNLOCK(sav); 859a2bc81bfSJohn-Mark Gurney be64enc(&ivp[4], cntr); 860a2bc81bfSJohn-Mark Gurney 861a2bc81bfSJohn-Mark Gurney if (SAV_ISCTR(sav)) { 862a2bc81bfSJohn-Mark Gurney /* Initial block counter is 1, RFC3686 4 */ 863a2bc81bfSJohn-Mark Gurney be32enc(&ivp[sav->ivlen + 4], 1); 864a2bc81bfSJohn-Mark Gurney } 865a2bc81bfSJohn-Mark Gurney 866a2bc81bfSJohn-Mark Gurney m_copyback(m, skip + hlen - sav->ivlen, sav->ivlen, &ivp[4]); 867a2bc81bfSJohn-Mark Gurney crde->crd_flags |= CRD_F_IV_EXPLICIT|CRD_F_IV_PRESENT; 86888768458SSam Leffler } 86988768458SSam Leffler 87088768458SSam Leffler /* Callback parameters */ 871f3677984SAndrey V. Elsukov key_addref(isr->sp); 87288768458SSam Leffler tc->tc_isr = isr; 87373171433SFabien Thomas KEY_ADDREFSA(sav); 87473171433SFabien Thomas tc->tc_sav = sav; 87588768458SSam Leffler tc->tc_spi = sav->spi; 87688768458SSam Leffler tc->tc_dst = saidx->dst; 87788768458SSam Leffler tc->tc_proto = saidx->proto; 87888768458SSam Leffler 87988768458SSam Leffler /* Crypto operation descriptor. */ 88088768458SSam Leffler crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */ 881d8409aafSSam Leffler crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 88288768458SSam Leffler crp->crp_buf = (caddr_t) m; 88388768458SSam Leffler crp->crp_callback = esp_output_cb; 88488768458SSam Leffler crp->crp_opaque = (caddr_t) tc; 88588768458SSam Leffler crp->crp_sid = sav->tdb_cryptoid; 88688768458SSam Leffler 88788768458SSam Leffler if (esph) { 88888768458SSam Leffler /* Authentication descriptor. */ 889a2bc81bfSJohn-Mark Gurney crda->crd_alg = esph->type; 89088768458SSam Leffler crda->crd_skip = skip; 891a2bc81bfSJohn-Mark Gurney if (SAV_ISGCM(sav)) 892a2bc81bfSJohn-Mark Gurney crda->crd_len = 8; /* RFC4106 5, SPI + SN */ 89316de9ac1SGeorge V. Neville-Neil else 89488768458SSam Leffler crda->crd_len = m->m_pkthdr.len - (skip + alen); 89588768458SSam Leffler crda->crd_inject = m->m_pkthdr.len - alen; 89616de9ac1SGeorge V. Neville-Neil } 89716de9ac1SGeorge V. Neville-Neil 89888768458SSam Leffler return crypto_dispatch(crp); 89988768458SSam Leffler bad: 90088768458SSam Leffler if (m) 90188768458SSam Leffler m_freem(m); 90288768458SSam Leffler return (error); 90388768458SSam Leffler } 90488768458SSam Leffler 90588768458SSam Leffler /* 90688768458SSam Leffler * ESP output callback from the crypto driver. 90788768458SSam Leffler */ 90888768458SSam Leffler static int 90988768458SSam Leffler esp_output_cb(struct cryptop *crp) 91088768458SSam Leffler { 911962ac6c7SAndrey V. Elsukov char buf[INET6_ADDRSTRLEN]; 91288768458SSam Leffler struct tdb_crypto *tc; 91388768458SSam Leffler struct ipsecrequest *isr; 91488768458SSam Leffler struct secasvar *sav; 91588768458SSam Leffler struct mbuf *m; 9160e4fb1dbSPawel Jakub Dawidek int error; 91788768458SSam Leffler 91888768458SSam Leffler tc = (struct tdb_crypto *) crp->crp_opaque; 9199ffa9677SSam Leffler IPSEC_ASSERT(tc != NULL, ("null opaque data area!")); 92088768458SSam Leffler m = (struct mbuf *) crp->crp_buf; 92188768458SSam Leffler 92288768458SSam Leffler isr = tc->tc_isr; 9233d80e82dSAndrey V. Elsukov IPSEC_ASSERT(isr->sp != NULL, ("NULL isr->sp")); 9249ffa9677SSam Leffler IPSECREQUEST_LOCK(isr); 92573171433SFabien Thomas sav = tc->tc_sav; 926a2bc81bfSJohn-Mark Gurney 927a2bc81bfSJohn-Mark Gurney /* With the isr lock released, SA pointer may have changed. */ 92873171433SFabien Thomas if (sav != isr->sav) { 929a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_notdb); 9309ffa9677SSam Leffler DPRINTF(("%s: SA gone during crypto (SA %s/%08lx proto %u)\n", 931962ac6c7SAndrey V. Elsukov __func__, ipsec_address(&tc->tc_dst, buf, sizeof(buf)), 93288768458SSam Leffler (u_long) ntohl(tc->tc_spi), tc->tc_proto)); 93388768458SSam Leffler error = ENOBUFS; /*XXX*/ 93488768458SSam Leffler goto bad; 93588768458SSam Leffler } 93688768458SSam Leffler 93788768458SSam Leffler /* Check for crypto errors. */ 93888768458SSam Leffler if (crp->crp_etype) { 93988768458SSam Leffler /* Reset session ID. */ 94088768458SSam Leffler if (sav->tdb_cryptoid != 0) 94188768458SSam Leffler sav->tdb_cryptoid = crp->crp_sid; 94288768458SSam Leffler 94388768458SSam Leffler if (crp->crp_etype == EAGAIN) { 9449ffa9677SSam Leffler IPSECREQUEST_UNLOCK(isr); 9450a95a08eSPawel Jakub Dawidek return (crypto_dispatch(crp)); 94688768458SSam Leffler } 94788768458SSam Leffler 948a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_noxform); 9499ffa9677SSam Leffler DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 95088768458SSam Leffler error = crp->crp_etype; 95188768458SSam Leffler goto bad; 95288768458SSam Leffler } 95388768458SSam Leffler 95488768458SSam Leffler /* Shouldn't happen... */ 95588768458SSam Leffler if (m == NULL) { 956a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_crypto); 9579ffa9677SSam Leffler DPRINTF(("%s: bogus returned buffer from crypto\n", __func__)); 95888768458SSam Leffler error = EINVAL; 95988768458SSam Leffler goto bad; 96088768458SSam Leffler } 961a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_hist[sav->alg_enc]); 96288768458SSam Leffler if (sav->tdb_authalgxform != NULL) 963a04d64d8SAndrey V. Elsukov AHSTAT_INC(ahs_hist[sav->alg_auth]); 96488768458SSam Leffler 96588768458SSam Leffler /* Release crypto descriptors. */ 96688768458SSam Leffler free(tc, M_XDATA); 96788768458SSam Leffler crypto_freereq(crp); 96888768458SSam Leffler 9696131838bSPawel Jakub Dawidek #ifdef REGRESSION 970dfa9422bSPawel Jakub Dawidek /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */ 971603724d3SBjoern A. Zeeb if (V_ipsec_integrity) { 972442da28aSVANHULLEBUS Yvan static unsigned char ipseczeroes[AH_HMAC_MAXHASHLEN]; 973dfa9422bSPawel Jakub Dawidek struct auth_hash *esph; 974dfa9422bSPawel Jakub Dawidek 975dfa9422bSPawel Jakub Dawidek /* 976dfa9422bSPawel Jakub Dawidek * Corrupt HMAC if we want to test integrity verification of 977dfa9422bSPawel Jakub Dawidek * the other side. 978dfa9422bSPawel Jakub Dawidek */ 979dfa9422bSPawel Jakub Dawidek esph = sav->tdb_authalgxform; 980dfa9422bSPawel Jakub Dawidek if (esph != NULL) { 981442da28aSVANHULLEBUS Yvan int alen; 982442da28aSVANHULLEBUS Yvan 983a09a7146SJohn-Mark Gurney alen = xform_ah_authsize(esph); 984442da28aSVANHULLEBUS Yvan m_copyback(m, m->m_pkthdr.len - alen, 985442da28aSVANHULLEBUS Yvan alen, ipseczeroes); 986dfa9422bSPawel Jakub Dawidek } 987dfa9422bSPawel Jakub Dawidek } 9886131838bSPawel Jakub Dawidek #endif 989dfa9422bSPawel Jakub Dawidek 99088768458SSam Leffler /* NB: m is reclaimed by ipsec_process_done. */ 9910e4fb1dbSPawel Jakub Dawidek error = ipsec_process_done(m, isr); 99288768458SSam Leffler KEY_FREESAV(&sav); 9939ffa9677SSam Leffler IPSECREQUEST_UNLOCK(isr); 9943d80e82dSAndrey V. Elsukov KEY_FREESP(&isr->sp); 9953d80e82dSAndrey V. Elsukov return (error); 99688768458SSam Leffler bad: 99788768458SSam Leffler if (sav) 99888768458SSam Leffler KEY_FREESAV(&sav); 9999ffa9677SSam Leffler IPSECREQUEST_UNLOCK(isr); 10003d80e82dSAndrey V. Elsukov KEY_FREESP(&isr->sp); 100188768458SSam Leffler if (m) 100288768458SSam Leffler m_freem(m); 100388768458SSam Leffler free(tc, M_XDATA); 100488768458SSam Leffler crypto_freereq(crp); 10053d80e82dSAndrey V. Elsukov return (error); 100688768458SSam Leffler } 100788768458SSam Leffler 100888768458SSam Leffler static struct xformsw esp_xformsw = { 100988768458SSam Leffler XF_ESP, XFT_CONF|XFT_AUTH, "IPsec ESP", 101088768458SSam Leffler esp_init, esp_zeroize, esp_input, 101188768458SSam Leffler esp_output 101288768458SSam Leffler }; 101388768458SSam Leffler 101488768458SSam Leffler static void 101588768458SSam Leffler esp_attach(void) 101688768458SSam Leffler { 10171ed81b73SMarko Zec 1018eddfbb76SRobert Watson xform_register(&esp_xformsw); 101988768458SSam Leffler } 10208976be94SSam Leffler SYSINIT(esp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, esp_attach, NULL); 1021