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> 49fcf59617SAndrey V. Elsukov #include <sys/mutex.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 97c2fd516fSJohn Baldwin static struct timeval deswarn, blfwarn, castwarn, camelliawarn; 98c2fd516fSJohn Baldwin 9988768458SSam Leffler static int esp_input_cb(struct cryptop *op); 10088768458SSam Leffler static int esp_output_cb(struct cryptop *crp); 101bfe1aba4SMarko Zec 10288768458SSam Leffler size_t 10388768458SSam Leffler esp_hdrsiz(struct secasvar *sav) 10488768458SSam Leffler { 10588768458SSam Leffler size_t size; 10688768458SSam Leffler 10788768458SSam Leffler if (sav != NULL) { 10888768458SSam Leffler /*XXX not right for null algorithm--does it matter??*/ 1099ffa9677SSam Leffler IPSEC_ASSERT(sav->tdb_encalgxform != NULL, 1109ffa9677SSam Leffler ("SA with null xform")); 11188768458SSam Leffler if (sav->flags & SADB_X_EXT_OLD) 11288768458SSam Leffler size = sizeof (struct esp); 11388768458SSam Leffler else 11488768458SSam Leffler size = sizeof (struct newesp); 11588768458SSam Leffler size += sav->tdb_encalgxform->blocksize + 9; 11688768458SSam Leffler /*XXX need alg check???*/ 11788768458SSam Leffler if (sav->tdb_authalgxform != NULL && sav->replay) 11888768458SSam Leffler size += ah_hdrsiz(sav); 11988768458SSam Leffler } else { 12088768458SSam Leffler /* 12188768458SSam Leffler * base header size 12288768458SSam Leffler * + max iv length for CBC mode 12388768458SSam Leffler * + max pad length 12488768458SSam Leffler * + sizeof (pad length field) 12588768458SSam Leffler * + sizeof (next header field) 12688768458SSam Leffler * + max icv supported. 12788768458SSam Leffler */ 128cdb7ebe3SPawel Jakub Dawidek size = sizeof (struct newesp) + EALG_MAX_BLOCK_LEN + 9 + 16; 12988768458SSam Leffler } 13088768458SSam Leffler return size; 13188768458SSam Leffler } 13288768458SSam Leffler 13388768458SSam Leffler /* 13488768458SSam Leffler * esp_init() is called when an SPI is being set up. 13588768458SSam Leffler */ 13688768458SSam Leffler static int 13788768458SSam Leffler esp_init(struct secasvar *sav, struct xformsw *xsp) 13888768458SSam Leffler { 139fcf59617SAndrey V. Elsukov const struct enc_xform *txform; 14088768458SSam Leffler struct cryptoini cria, crie; 14188768458SSam Leffler int keylen; 14288768458SSam Leffler int error; 14388768458SSam Leffler 144fcf59617SAndrey V. Elsukov txform = enc_algorithm_lookup(sav->alg_enc); 14588768458SSam Leffler if (txform == NULL) { 1469ffa9677SSam Leffler DPRINTF(("%s: unsupported encryption algorithm %d\n", 1479ffa9677SSam Leffler __func__, sav->alg_enc)); 14888768458SSam Leffler return EINVAL; 14988768458SSam Leffler } 15088768458SSam Leffler if (sav->key_enc == NULL) { 1519ffa9677SSam Leffler DPRINTF(("%s: no encoding key for %s algorithm\n", 1529ffa9677SSam Leffler __func__, txform->name)); 15388768458SSam Leffler return EINVAL; 15488768458SSam Leffler } 155a2bc81bfSJohn-Mark Gurney if ((sav->flags & (SADB_X_EXT_OLD | SADB_X_EXT_IV4B)) == 156a2bc81bfSJohn-Mark Gurney SADB_X_EXT_IV4B) { 1579ffa9677SSam Leffler DPRINTF(("%s: 4-byte IV not supported with protocol\n", 1589ffa9677SSam Leffler __func__)); 15988768458SSam Leffler return EINVAL; 16088768458SSam Leffler } 161c2fd516fSJohn Baldwin 162c2fd516fSJohn Baldwin switch (sav->alg_enc) { 163c2fd516fSJohn Baldwin case SADB_EALG_DESCBC: 1640f702183SJohn Baldwin if (ratecheck(&deswarn, &ipsec_warn_interval)) 165c2fd516fSJohn Baldwin gone_in(13, "DES cipher for IPsec"); 166c2fd516fSJohn Baldwin break; 167c2fd516fSJohn Baldwin case SADB_X_EALG_BLOWFISHCBC: 1680f702183SJohn Baldwin if (ratecheck(&blfwarn, &ipsec_warn_interval)) 169c2fd516fSJohn Baldwin gone_in(13, "Blowfish cipher for IPsec"); 170c2fd516fSJohn Baldwin break; 171c2fd516fSJohn Baldwin case SADB_X_EALG_CAST128CBC: 1720f702183SJohn Baldwin if (ratecheck(&castwarn, &ipsec_warn_interval)) 173c2fd516fSJohn Baldwin gone_in(13, "CAST cipher for IPsec"); 174c2fd516fSJohn Baldwin break; 175c2fd516fSJohn Baldwin case SADB_X_EALG_CAMELLIACBC: 1760f702183SJohn Baldwin if (ratecheck(&camelliawarn, &ipsec_warn_interval)) 177c2fd516fSJohn Baldwin gone_in(13, "Camellia cipher for IPsec"); 178c2fd516fSJohn Baldwin break; 179c2fd516fSJohn Baldwin } 180c2fd516fSJohn Baldwin 181a2bc81bfSJohn-Mark Gurney /* subtract off the salt, RFC4106, 8.1 and RFC3686, 5.1 */ 182a2bc81bfSJohn-Mark Gurney keylen = _KEYLEN(sav->key_enc) - SAV_ISCTRORGCM(sav) * 4; 18388768458SSam Leffler if (txform->minkey > keylen || keylen > txform->maxkey) { 1849ffa9677SSam Leffler DPRINTF(("%s: invalid key length %u, must be in the range " 1859ffa9677SSam Leffler "[%u..%u] for algorithm %s\n", __func__, 18688768458SSam Leffler keylen, txform->minkey, txform->maxkey, 18788768458SSam Leffler txform->name)); 18888768458SSam Leffler return EINVAL; 18988768458SSam Leffler } 19088768458SSam Leffler 191a2bc81bfSJohn-Mark Gurney if (SAV_ISCTRORGCM(sav)) 192a2bc81bfSJohn-Mark Gurney sav->ivlen = 8; /* RFC4106 3.1 and RFC3686 3.1 */ 193a2bc81bfSJohn-Mark Gurney else 1940c80e7dfSAndrey V. Elsukov sav->ivlen = txform->ivsize; 19588768458SSam Leffler 19688768458SSam Leffler /* 19788768458SSam Leffler * Setup AH-related state. 19888768458SSam Leffler */ 19988768458SSam Leffler if (sav->alg_auth != 0) { 20088768458SSam Leffler error = ah_init0(sav, xsp, &cria); 20188768458SSam Leffler if (error) 20288768458SSam Leffler return error; 20388768458SSam Leffler } 20488768458SSam Leffler 20588768458SSam Leffler /* NB: override anything set in ah_init0 */ 20688768458SSam Leffler sav->tdb_xform = xsp; 20788768458SSam Leffler sav->tdb_encalgxform = txform; 20888768458SSam Leffler 20916de9ac1SGeorge V. Neville-Neil /* 21016de9ac1SGeorge V. Neville-Neil * Whenever AES-GCM is used for encryption, one 21116de9ac1SGeorge V. Neville-Neil * of the AES authentication algorithms is chosen 21216de9ac1SGeorge V. Neville-Neil * as well, based on the key size. 21316de9ac1SGeorge V. Neville-Neil */ 21416de9ac1SGeorge V. Neville-Neil if (sav->alg_enc == SADB_X_EALG_AESGCM16) { 21516de9ac1SGeorge V. Neville-Neil switch (keylen) { 216a2bc81bfSJohn-Mark Gurney case AES_128_GMAC_KEY_LEN: 21716de9ac1SGeorge V. Neville-Neil sav->alg_auth = SADB_X_AALG_AES128GMAC; 21816de9ac1SGeorge V. Neville-Neil sav->tdb_authalgxform = &auth_hash_nist_gmac_aes_128; 21916de9ac1SGeorge V. Neville-Neil break; 220a2bc81bfSJohn-Mark Gurney case AES_192_GMAC_KEY_LEN: 22116de9ac1SGeorge V. Neville-Neil sav->alg_auth = SADB_X_AALG_AES192GMAC; 22216de9ac1SGeorge V. Neville-Neil sav->tdb_authalgxform = &auth_hash_nist_gmac_aes_192; 22316de9ac1SGeorge V. Neville-Neil break; 224a2bc81bfSJohn-Mark Gurney case AES_256_GMAC_KEY_LEN: 22516de9ac1SGeorge V. Neville-Neil sav->alg_auth = SADB_X_AALG_AES256GMAC; 22616de9ac1SGeorge V. Neville-Neil sav->tdb_authalgxform = &auth_hash_nist_gmac_aes_256; 22716de9ac1SGeorge V. Neville-Neil break; 22816de9ac1SGeorge V. Neville-Neil default: 22916de9ac1SGeorge V. Neville-Neil DPRINTF(("%s: invalid key length %u" 23016de9ac1SGeorge V. Neville-Neil "for algorithm %s\n", __func__, 23116de9ac1SGeorge V. Neville-Neil keylen, txform->name)); 23216de9ac1SGeorge V. Neville-Neil return EINVAL; 23316de9ac1SGeorge V. Neville-Neil } 23416de9ac1SGeorge V. Neville-Neil bzero(&cria, sizeof(cria)); 23516de9ac1SGeorge V. Neville-Neil cria.cri_alg = sav->tdb_authalgxform->type; 23616de9ac1SGeorge V. Neville-Neil cria.cri_key = sav->key_enc->key_data; 237a2bc81bfSJohn-Mark Gurney cria.cri_klen = _KEYBITS(sav->key_enc) - SAV_ISGCM(sav) * 32; 23816de9ac1SGeorge V. Neville-Neil } 23916de9ac1SGeorge V. Neville-Neil 24088768458SSam Leffler /* Initialize crypto session. */ 24188768458SSam Leffler bzero(&crie, sizeof(crie)); 24288768458SSam Leffler crie.cri_alg = sav->tdb_encalgxform->type; 243a0196c3cSGeorge V. Neville-Neil crie.cri_key = sav->key_enc->key_data; 244a2bc81bfSJohn-Mark Gurney crie.cri_klen = _KEYBITS(sav->key_enc) - SAV_ISCTRORGCM(sav) * 32; 24588768458SSam Leffler 24688768458SSam Leffler if (sav->tdb_authalgxform && sav->tdb_encalgxform) { 24788768458SSam Leffler /* init both auth & enc */ 24888768458SSam Leffler crie.cri_next = &cria; 24988768458SSam Leffler error = crypto_newsession(&sav->tdb_cryptoid, 250603724d3SBjoern A. Zeeb &crie, V_crypto_support); 25188768458SSam Leffler } else if (sav->tdb_encalgxform) { 25288768458SSam Leffler error = crypto_newsession(&sav->tdb_cryptoid, 253603724d3SBjoern A. Zeeb &crie, V_crypto_support); 25488768458SSam Leffler } else if (sav->tdb_authalgxform) { 25588768458SSam Leffler error = crypto_newsession(&sav->tdb_cryptoid, 256603724d3SBjoern A. Zeeb &cria, V_crypto_support); 25788768458SSam Leffler } else { 25888768458SSam Leffler /* XXX cannot happen? */ 2599ffa9677SSam Leffler DPRINTF(("%s: no encoding OR authentication xform!\n", 2609ffa9677SSam Leffler __func__)); 26188768458SSam Leffler error = EINVAL; 26288768458SSam Leffler } 26388768458SSam Leffler return error; 26488768458SSam Leffler } 26588768458SSam Leffler 26688768458SSam Leffler /* 26788768458SSam Leffler * Paranoia. 26888768458SSam Leffler */ 26988768458SSam Leffler static int 27088768458SSam Leffler esp_zeroize(struct secasvar *sav) 27188768458SSam Leffler { 27288768458SSam Leffler /* NB: ah_zerorize free's the crypto session state */ 27388768458SSam Leffler int error = ah_zeroize(sav); 27488768458SSam Leffler 27588768458SSam Leffler if (sav->key_enc) 276a0196c3cSGeorge V. Neville-Neil bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 27788768458SSam Leffler sav->tdb_encalgxform = NULL; 27888768458SSam Leffler sav->tdb_xform = NULL; 27988768458SSam Leffler return error; 28088768458SSam Leffler } 28188768458SSam Leffler 28288768458SSam Leffler /* 28388768458SSam Leffler * ESP input processing, called (eventually) through the protocol switch. 28488768458SSam Leffler */ 28588768458SSam Leffler static int 28688768458SSam Leffler esp_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 28788768458SSam Leffler { 2887f1f6591SAndrey V. Elsukov IPSEC_DEBUG_DECLARE(char buf[128]); 289fcf59617SAndrey V. Elsukov const struct auth_hash *esph; 290fcf59617SAndrey V. Elsukov const struct enc_xform *espx; 291fcf59617SAndrey V. Elsukov struct xform_data *xd; 29288768458SSam Leffler struct cryptodesc *crde; 29388768458SSam Leffler struct cryptop *crp; 294fcf59617SAndrey V. Elsukov struct newesp *esp; 295fcf59617SAndrey V. Elsukov uint8_t *ivp; 2962e08e39fSConrad Meyer crypto_session_t cryptoid; 2975f7c516fSAndrey V. Elsukov int alen, error, hlen, plen; 29888768458SSam Leffler 2999ffa9677SSam Leffler IPSEC_ASSERT(sav != NULL, ("null SA")); 3009ffa9677SSam Leffler IPSEC_ASSERT(sav->tdb_encalgxform != NULL, ("null encoding xform")); 301a45bff04SVANHULLEBUS Yvan 3025f7c516fSAndrey V. Elsukov error = EINVAL; 303a45bff04SVANHULLEBUS Yvan /* Valid IP Packet length ? */ 304a45bff04SVANHULLEBUS Yvan if ( (skip&3) || (m->m_pkthdr.len&3) ){ 305a45bff04SVANHULLEBUS Yvan DPRINTF(("%s: misaligned packet, skip %u pkt len %u", 306a45bff04SVANHULLEBUS Yvan __func__, skip, m->m_pkthdr.len)); 307a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_badilen); 3085f7c516fSAndrey V. Elsukov goto bad; 309a45bff04SVANHULLEBUS Yvan } 310*63abacc2SBjoern A. Zeeb 311*63abacc2SBjoern A. Zeeb m = m_pullup(m, skip + sizeof(*esp)); 312*63abacc2SBjoern A. Zeeb if (m == NULL) { 313*63abacc2SBjoern A. Zeeb DPRINTF(("%s: cannot pullup header\n", __func__)); 314*63abacc2SBjoern A. Zeeb ESPSTAT_INC(esps_hdrops); /*XXX*/ 315*63abacc2SBjoern A. Zeeb error = ENOBUFS; 316*63abacc2SBjoern A. Zeeb goto bad; 317*63abacc2SBjoern A. Zeeb } 318*63abacc2SBjoern A. Zeeb esp = (struct newesp *)(mtod(m, caddr_t) + skip); 31988768458SSam Leffler 32088768458SSam Leffler esph = sav->tdb_authalgxform; 32188768458SSam Leffler espx = sav->tdb_encalgxform; 32288768458SSam Leffler 323a09a7146SJohn-Mark Gurney /* Determine the ESP header and auth length */ 32488768458SSam Leffler if (sav->flags & SADB_X_EXT_OLD) 32588768458SSam Leffler hlen = sizeof (struct esp) + sav->ivlen; 32688768458SSam Leffler else 32788768458SSam Leffler hlen = sizeof (struct newesp) + sav->ivlen; 328a09a7146SJohn-Mark Gurney 329a09a7146SJohn-Mark Gurney alen = xform_ah_authsize(esph); 33088768458SSam Leffler 33188768458SSam Leffler /* 33288768458SSam Leffler * Verify payload length is multiple of encryption algorithm 33388768458SSam Leffler * block size. 33488768458SSam Leffler * 33588768458SSam Leffler * NB: This works for the null algorithm because the blocksize 33688768458SSam Leffler * is 4 and all packets must be 4-byte aligned regardless 33788768458SSam Leffler * of the algorithm. 33888768458SSam Leffler */ 33988768458SSam Leffler plen = m->m_pkthdr.len - (skip + hlen + alen); 34088768458SSam Leffler if ((plen & (espx->blocksize - 1)) || (plen <= 0)) { 3419ffa9677SSam Leffler DPRINTF(("%s: payload of %d octets not a multiple of %d octets," 342a2bc81bfSJohn-Mark Gurney " SA %s/%08lx\n", __func__, plen, espx->blocksize, 343a2bc81bfSJohn-Mark Gurney ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), 344a2bc81bfSJohn-Mark Gurney (u_long)ntohl(sav->spi))); 345a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_badilen); 3465f7c516fSAndrey V. Elsukov goto bad; 34788768458SSam Leffler } 34888768458SSam Leffler 34988768458SSam Leffler /* 35088768458SSam Leffler * Check sequence number. 35188768458SSam Leffler */ 352fcf59617SAndrey V. Elsukov SECASVAR_LOCK(sav); 353fcf59617SAndrey V. Elsukov if (esph != NULL && sav->replay != NULL && sav->replay->wsize != 0) { 354fcf59617SAndrey V. Elsukov if (ipsec_chkreplay(ntohl(esp->esp_seq), sav) == 0) { 355fcf59617SAndrey V. Elsukov SECASVAR_UNLOCK(sav); 3569ffa9677SSam Leffler DPRINTF(("%s: packet replay check for %s\n", __func__, 357fcf59617SAndrey V. Elsukov ipsec_sa2str(sav, buf, sizeof(buf)))); 358a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_replay); 3595f7c516fSAndrey V. Elsukov error = EACCES; 3605f7c516fSAndrey V. Elsukov goto bad; 36188768458SSam Leffler } 362fcf59617SAndrey V. Elsukov } 363fcf59617SAndrey V. Elsukov cryptoid = sav->tdb_cryptoid; 364fcf59617SAndrey V. Elsukov SECASVAR_UNLOCK(sav); 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); 3755f7c516fSAndrey V. Elsukov error = ENOBUFS; 3765f7c516fSAndrey V. Elsukov goto bad; 37788768458SSam Leffler } 37888768458SSam Leffler 37988768458SSam Leffler /* Get IPsec-specific opaque pointer */ 380fcf59617SAndrey V. Elsukov xd = malloc(sizeof(*xd) + alen, M_XDATA, M_NOWAIT | M_ZERO); 381fcf59617SAndrey V. Elsukov if (xd == NULL) { 382fcf59617SAndrey V. Elsukov DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 383a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_crypto); 384fcf59617SAndrey V. Elsukov crypto_freereq(crp); 3855f7c516fSAndrey V. Elsukov error = ENOBUFS; 3865f7c516fSAndrey V. Elsukov goto bad; 38788768458SSam Leffler } 38888768458SSam Leffler 38908537f45SAndrey V. Elsukov if (esph != NULL) { 39088768458SSam Leffler struct cryptodesc *crda = crp->crp_desc; 39188768458SSam Leffler 3929ffa9677SSam Leffler IPSEC_ASSERT(crda != NULL, ("null ah crypto descriptor")); 39388768458SSam Leffler 39488768458SSam Leffler /* Authentication descriptor */ 39588768458SSam Leffler crda->crd_skip = skip; 396a2bc81bfSJohn-Mark Gurney if (SAV_ISGCM(sav)) 397a2bc81bfSJohn-Mark Gurney crda->crd_len = 8; /* RFC4106 5, SPI + SN */ 39816de9ac1SGeorge V. Neville-Neil else 39988768458SSam Leffler crda->crd_len = m->m_pkthdr.len - (skip + alen); 40088768458SSam Leffler crda->crd_inject = m->m_pkthdr.len - alen; 40188768458SSam Leffler 40288768458SSam Leffler crda->crd_alg = esph->type; 40388768458SSam Leffler 40488768458SSam Leffler /* Copy the authenticator */ 40588768458SSam Leffler m_copydata(m, m->m_pkthdr.len - alen, alen, 406fcf59617SAndrey V. Elsukov (caddr_t) (xd + 1)); 40788768458SSam Leffler 40888768458SSam Leffler /* Chain authentication request */ 40988768458SSam Leffler crde = crda->crd_next; 41088768458SSam Leffler } else { 41188768458SSam Leffler crde = crp->crp_desc; 41288768458SSam Leffler } 41388768458SSam Leffler 41488768458SSam Leffler /* Crypto operation descriptor */ 41588768458SSam Leffler crp->crp_ilen = m->m_pkthdr.len; /* Total input length */ 416d8409aafSSam Leffler crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 41739bbca6fSFabien Thomas if (V_async_crypto) 41839bbca6fSFabien Thomas crp->crp_flags |= CRYPTO_F_ASYNC | CRYPTO_F_ASYNC_KEEPORDER; 41988768458SSam Leffler crp->crp_buf = (caddr_t) m; 42088768458SSam Leffler crp->crp_callback = esp_input_cb; 4211b0909d5SConrad Meyer crp->crp_session = cryptoid; 422fcf59617SAndrey V. Elsukov crp->crp_opaque = (caddr_t) xd; 42388768458SSam Leffler 42488768458SSam Leffler /* These are passed as-is to the callback */ 425fcf59617SAndrey V. Elsukov xd->sav = sav; 426fcf59617SAndrey V. Elsukov xd->protoff = protoff; 427fcf59617SAndrey V. Elsukov xd->skip = skip; 428fcf59617SAndrey V. Elsukov xd->cryptoid = cryptoid; 429fd40ecf3SJohn Baldwin xd->vnet = curvnet; 43088768458SSam Leffler 43188768458SSam Leffler /* Decryption descriptor */ 4329ffa9677SSam Leffler IPSEC_ASSERT(crde != NULL, ("null esp crypto descriptor")); 43388768458SSam Leffler crde->crd_skip = skip + hlen; 43488768458SSam Leffler crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen); 43588768458SSam Leffler crde->crd_inject = skip + hlen - sav->ivlen; 43688768458SSam Leffler 437a2bc81bfSJohn-Mark Gurney if (SAV_ISCTRORGCM(sav)) { 438a2bc81bfSJohn-Mark Gurney ivp = &crde->crd_iv[0]; 43916de9ac1SGeorge V. Neville-Neil 440a2bc81bfSJohn-Mark Gurney /* GCM IV Format: RFC4106 4 */ 441a2bc81bfSJohn-Mark Gurney /* CTR IV Format: RFC3686 4 */ 442a2bc81bfSJohn-Mark Gurney /* Salt is last four bytes of key, RFC4106 8.1 */ 443a2bc81bfSJohn-Mark Gurney /* Nonce is last four bytes of key, RFC3686 5.1 */ 444a2bc81bfSJohn-Mark Gurney memcpy(ivp, sav->key_enc->key_data + 445a2bc81bfSJohn-Mark Gurney _KEYLEN(sav->key_enc) - 4, 4); 446a2bc81bfSJohn-Mark Gurney 447a2bc81bfSJohn-Mark Gurney if (SAV_ISCTR(sav)) { 448a2bc81bfSJohn-Mark Gurney /* Initial block counter is 1, RFC3686 4 */ 449a2bc81bfSJohn-Mark Gurney be32enc(&ivp[sav->ivlen + 4], 1); 450a2bc81bfSJohn-Mark Gurney } 451a2bc81bfSJohn-Mark Gurney 452a2bc81bfSJohn-Mark Gurney m_copydata(m, skip + hlen - sav->ivlen, sav->ivlen, &ivp[4]); 453a2bc81bfSJohn-Mark Gurney crde->crd_flags |= CRD_F_IV_EXPLICIT; 454a2bc81bfSJohn-Mark Gurney } 455a2bc81bfSJohn-Mark Gurney 456a2bc81bfSJohn-Mark Gurney crde->crd_alg = espx->type; 45788768458SSam Leffler 45808537f45SAndrey V. Elsukov return (crypto_dispatch(crp)); 4595f7c516fSAndrey V. Elsukov bad: 4605f7c516fSAndrey V. Elsukov m_freem(m); 4615f7c516fSAndrey V. Elsukov key_freesav(&sav); 4625f7c516fSAndrey V. Elsukov return (error); 46388768458SSam Leffler } 46488768458SSam Leffler 46588768458SSam Leffler /* 46688768458SSam Leffler * ESP input callback from the crypto driver. 46788768458SSam Leffler */ 46888768458SSam Leffler static int 46988768458SSam Leffler esp_input_cb(struct cryptop *crp) 47088768458SSam Leffler { 4717f1f6591SAndrey V. Elsukov IPSEC_DEBUG_DECLARE(char buf[128]); 472442da28aSVANHULLEBUS Yvan u_int8_t lastthree[3], aalg[AH_HMAC_MAXHASHLEN]; 473fcf59617SAndrey V. Elsukov const struct auth_hash *esph; 47488768458SSam Leffler struct mbuf *m; 47588768458SSam Leffler struct cryptodesc *crd; 476fcf59617SAndrey V. Elsukov struct xform_data *xd; 47788768458SSam Leffler struct secasvar *sav; 47888768458SSam Leffler struct secasindex *saidx; 47988768458SSam Leffler caddr_t ptr; 4802e08e39fSConrad Meyer crypto_session_t cryptoid; 481fcf59617SAndrey V. Elsukov int hlen, skip, protoff, error, alen; 48288768458SSam Leffler 48388768458SSam Leffler crd = crp->crp_desc; 4849ffa9677SSam Leffler IPSEC_ASSERT(crd != NULL, ("null crypto descriptor!")); 48588768458SSam Leffler 48688768458SSam Leffler m = (struct mbuf *) crp->crp_buf; 487fcf59617SAndrey V. Elsukov xd = (struct xform_data *) crp->crp_opaque; 488fd40ecf3SJohn Baldwin CURVNET_SET(xd->vnet); 489fcf59617SAndrey V. Elsukov sav = xd->sav; 490fcf59617SAndrey V. Elsukov skip = xd->skip; 491fcf59617SAndrey V. Elsukov protoff = xd->protoff; 492fcf59617SAndrey V. Elsukov cryptoid = xd->cryptoid; 49388768458SSam Leffler saidx = &sav->sah->saidx; 49488768458SSam Leffler esph = sav->tdb_authalgxform; 49588768458SSam Leffler 49688768458SSam Leffler /* Check for crypto errors */ 49788768458SSam Leffler if (crp->crp_etype) { 498fcf59617SAndrey V. Elsukov if (crp->crp_etype == EAGAIN) { 49988768458SSam Leffler /* Reset the session ID */ 5001b0909d5SConrad Meyer if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 501fcf59617SAndrey V. Elsukov crypto_freesession(cryptoid); 5021b0909d5SConrad Meyer xd->cryptoid = crp->crp_session; 503fd40ecf3SJohn Baldwin CURVNET_RESTORE(); 5040a95a08eSPawel Jakub Dawidek return (crypto_dispatch(crp)); 505fcf59617SAndrey V. Elsukov } 506a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_noxform); 5079ffa9677SSam Leffler DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 50888768458SSam Leffler error = crp->crp_etype; 50988768458SSam Leffler goto bad; 51088768458SSam Leffler } 51188768458SSam Leffler 51288768458SSam Leffler /* Shouldn't happen... */ 51388768458SSam Leffler if (m == NULL) { 514a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_crypto); 5159ffa9677SSam Leffler DPRINTF(("%s: bogus returned buffer from crypto\n", __func__)); 51688768458SSam Leffler error = EINVAL; 51788768458SSam Leffler goto bad; 51888768458SSam Leffler } 519a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_hist[sav->alg_enc]); 52088768458SSam Leffler 52188768458SSam Leffler /* If authentication was performed, check now. */ 52288768458SSam Leffler if (esph != NULL) { 523a09a7146SJohn-Mark Gurney alen = xform_ah_authsize(esph); 524a04d64d8SAndrey V. Elsukov AHSTAT_INC(ahs_hist[sav->alg_auth]); 52588768458SSam Leffler /* Copy the authenticator from the packet */ 52608537f45SAndrey V. Elsukov m_copydata(m, m->m_pkthdr.len - alen, alen, aalg); 527fcf59617SAndrey V. Elsukov ptr = (caddr_t) (xd + 1); 52888768458SSam Leffler 52988768458SSam Leffler /* Verify authenticator */ 53042e5fcbfSJohn-Mark Gurney if (timingsafe_bcmp(ptr, aalg, alen) != 0) { 53108537f45SAndrey V. Elsukov DPRINTF(("%s: authentication hash mismatch for " 53208537f45SAndrey V. Elsukov "packet in SA %s/%08lx\n", __func__, 533962ac6c7SAndrey V. Elsukov ipsec_address(&saidx->dst, buf, sizeof(buf)), 53488768458SSam Leffler (u_long) ntohl(sav->spi))); 535a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_badauth); 53688768458SSam Leffler error = EACCES; 53788768458SSam Leffler goto bad; 53888768458SSam Leffler } 539fcf59617SAndrey V. Elsukov m->m_flags |= M_AUTHIPDGM; 54088768458SSam Leffler /* Remove trailing authenticator */ 541442da28aSVANHULLEBUS Yvan m_adj(m, -alen); 54288768458SSam Leffler } 54388768458SSam Leffler 54488768458SSam Leffler /* Release the crypto descriptors */ 545fcf59617SAndrey V. Elsukov free(xd, M_XDATA), xd = NULL; 54688768458SSam Leffler crypto_freereq(crp), crp = NULL; 54788768458SSam Leffler 54888768458SSam Leffler /* 54988768458SSam Leffler * Packet is now decrypted. 55088768458SSam Leffler */ 55188768458SSam Leffler m->m_flags |= M_DECRYPTED; 55288768458SSam Leffler 553d16f6f50SColin Percival /* 554d16f6f50SColin Percival * Update replay sequence number, if appropriate. 555d16f6f50SColin Percival */ 556d16f6f50SColin Percival if (sav->replay) { 557d16f6f50SColin Percival u_int32_t seq; 558d16f6f50SColin Percival 559d16f6f50SColin Percival m_copydata(m, skip + offsetof(struct newesp, esp_seq), 560d16f6f50SColin Percival sizeof (seq), (caddr_t) &seq); 561fcf59617SAndrey V. Elsukov SECASVAR_LOCK(sav); 562d16f6f50SColin Percival if (ipsec_updatereplay(ntohl(seq), sav)) { 563fcf59617SAndrey V. Elsukov SECASVAR_UNLOCK(sav); 564d16f6f50SColin Percival DPRINTF(("%s: packet replay check for %s\n", __func__, 565fcf59617SAndrey V. Elsukov ipsec_sa2str(sav, buf, sizeof(buf)))); 566a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_replay); 567fcf59617SAndrey V. Elsukov error = EACCES; 568d16f6f50SColin Percival goto bad; 569d16f6f50SColin Percival } 570fcf59617SAndrey V. Elsukov SECASVAR_UNLOCK(sav); 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 } 638fd40ecf3SJohn Baldwin CURVNET_RESTORE(); 63988768458SSam Leffler return error; 64088768458SSam Leffler bad: 641fd40ecf3SJohn Baldwin CURVNET_RESTORE(); 642fcf59617SAndrey V. Elsukov if (sav != NULL) 643fcf59617SAndrey V. Elsukov key_freesav(&sav); 64488768458SSam Leffler if (m != NULL) 64588768458SSam Leffler m_freem(m); 646fcf59617SAndrey V. Elsukov if (xd != NULL) 647fcf59617SAndrey V. Elsukov free(xd, M_XDATA); 64888768458SSam Leffler if (crp != NULL) 64988768458SSam Leffler crypto_freereq(crp); 65088768458SSam Leffler return error; 65188768458SSam Leffler } 65288768458SSam Leffler /* 653fcf59617SAndrey V. Elsukov * ESP output routine, called by ipsec[46]_perform_request(). 65488768458SSam Leffler */ 65588768458SSam Leffler static int 656fcf59617SAndrey V. Elsukov esp_output(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav, 657fcf59617SAndrey V. Elsukov u_int idx, int skip, int protoff) 65888768458SSam Leffler { 6597f1f6591SAndrey V. Elsukov IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 66088768458SSam Leffler struct cryptodesc *crde = NULL, *crda = NULL; 66188768458SSam Leffler struct cryptop *crp; 662fcf59617SAndrey V. Elsukov const struct auth_hash *esph; 663fcf59617SAndrey V. Elsukov const struct enc_xform *espx; 664fcf59617SAndrey V. Elsukov struct mbuf *mo = NULL; 665fcf59617SAndrey V. Elsukov struct xform_data *xd; 666fcf59617SAndrey V. Elsukov struct secasindex *saidx; 667fcf59617SAndrey V. Elsukov unsigned char *pad; 668fcf59617SAndrey V. Elsukov uint8_t *ivp; 6692e08e39fSConrad Meyer uint64_t cntr; 6702e08e39fSConrad Meyer crypto_session_t cryptoid; 671fcf59617SAndrey V. Elsukov int hlen, rlen, padding, blks, alen, i, roff; 672fcf59617SAndrey V. Elsukov int error, maxpacketsize; 673fcf59617SAndrey V. Elsukov uint8_t prot; 67488768458SSam Leffler 6759ffa9677SSam Leffler IPSEC_ASSERT(sav != NULL, ("null SA")); 67688768458SSam Leffler esph = sav->tdb_authalgxform; 67788768458SSam Leffler espx = sav->tdb_encalgxform; 6789ffa9677SSam Leffler IPSEC_ASSERT(espx != NULL, ("null encoding xform")); 67988768458SSam Leffler 68088768458SSam Leffler if (sav->flags & SADB_X_EXT_OLD) 68188768458SSam Leffler hlen = sizeof (struct esp) + sav->ivlen; 68288768458SSam Leffler else 68388768458SSam Leffler hlen = sizeof (struct newesp) + sav->ivlen; 68488768458SSam Leffler 68588768458SSam Leffler rlen = m->m_pkthdr.len - skip; /* Raw payload length. */ 68688768458SSam Leffler /* 687a2bc81bfSJohn-Mark Gurney * RFC4303 2.4 Requires 4 byte alignment. 68888768458SSam Leffler */ 689a2bc81bfSJohn-Mark Gurney blks = MAX(4, espx->blocksize); /* Cipher blocksize */ 69088768458SSam Leffler 69188768458SSam Leffler /* XXX clamp padding length a la KAME??? */ 69288768458SSam Leffler padding = ((blks - ((rlen + 2) % blks)) % blks) + 2; 69388768458SSam Leffler 694a09a7146SJohn-Mark Gurney alen = xform_ah_authsize(esph); 69588768458SSam Leffler 696a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_output); 69788768458SSam Leffler 69888768458SSam Leffler saidx = &sav->sah->saidx; 69988768458SSam Leffler /* Check for maximum packet size violations. */ 70088768458SSam Leffler switch (saidx->dst.sa.sa_family) { 70188768458SSam Leffler #ifdef INET 70288768458SSam Leffler case AF_INET: 70388768458SSam Leffler maxpacketsize = IP_MAXPACKET; 70488768458SSam Leffler break; 70588768458SSam Leffler #endif /* INET */ 70688768458SSam Leffler #ifdef INET6 70788768458SSam Leffler case AF_INET6: 70888768458SSam Leffler maxpacketsize = IPV6_MAXPACKET; 70988768458SSam Leffler break; 71088768458SSam Leffler #endif /* INET6 */ 71188768458SSam Leffler default: 7129ffa9677SSam Leffler DPRINTF(("%s: unknown/unsupported protocol " 7139ffa9677SSam Leffler "family %d, SA %s/%08lx\n", __func__, 714962ac6c7SAndrey V. Elsukov saidx->dst.sa.sa_family, ipsec_address(&saidx->dst, 715962ac6c7SAndrey V. Elsukov buf, sizeof(buf)), (u_long) ntohl(sav->spi))); 716a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_nopf); 71788768458SSam Leffler error = EPFNOSUPPORT; 71888768458SSam Leffler goto bad; 71988768458SSam Leffler } 720fcf59617SAndrey V. Elsukov /* 72116de9ac1SGeorge V. Neville-Neil DPRINTF(("%s: skip %d hlen %d rlen %d padding %d alen %d blksd %d\n", 722fcf59617SAndrey V. Elsukov __func__, skip, hlen, rlen, padding, alen, blks)); */ 72388768458SSam Leffler if (skip + hlen + rlen + padding + alen > maxpacketsize) { 7249ffa9677SSam Leffler DPRINTF(("%s: packet in SA %s/%08lx got too big " 7259ffa9677SSam Leffler "(len %u, max len %u)\n", __func__, 726962ac6c7SAndrey V. Elsukov ipsec_address(&saidx->dst, buf, sizeof(buf)), 727962ac6c7SAndrey V. Elsukov (u_long) ntohl(sav->spi), 72888768458SSam Leffler skip + hlen + rlen + padding + alen, maxpacketsize)); 729a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_toobig); 73088768458SSam Leffler error = EMSGSIZE; 73188768458SSam Leffler goto bad; 73288768458SSam Leffler } 73388768458SSam Leffler 73488768458SSam Leffler /* Update the counters. */ 735a04d64d8SAndrey V. Elsukov ESPSTAT_ADD(esps_obytes, m->m_pkthdr.len - skip); 73688768458SSam Leffler 73747e2996eSSam Leffler m = m_unshare(m, M_NOWAIT); 73888768458SSam Leffler if (m == NULL) { 7399ffa9677SSam Leffler DPRINTF(("%s: cannot clone mbuf chain, SA %s/%08lx\n", __func__, 740962ac6c7SAndrey V. Elsukov ipsec_address(&saidx->dst, buf, sizeof(buf)), 741962ac6c7SAndrey V. Elsukov (u_long) ntohl(sav->spi))); 742a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_hdrops); 74388768458SSam Leffler error = ENOBUFS; 74488768458SSam Leffler goto bad; 74588768458SSam Leffler } 74688768458SSam Leffler 74788768458SSam Leffler /* Inject ESP header. */ 74888768458SSam Leffler mo = m_makespace(m, skip, hlen, &roff); 74988768458SSam Leffler if (mo == NULL) { 7509ffa9677SSam Leffler DPRINTF(("%s: %u byte ESP hdr inject failed for SA %s/%08lx\n", 751962ac6c7SAndrey V. Elsukov __func__, hlen, ipsec_address(&saidx->dst, buf, 752962ac6c7SAndrey V. Elsukov sizeof(buf)), (u_long) ntohl(sav->spi))); 753a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_hdrops); /* XXX diffs from openbsd */ 75488768458SSam Leffler error = ENOBUFS; 75588768458SSam Leffler goto bad; 75688768458SSam Leffler } 75788768458SSam Leffler 75888768458SSam Leffler /* Initialize ESP header. */ 759fcf59617SAndrey V. Elsukov bcopy((caddr_t) &sav->spi, mtod(mo, caddr_t) + roff, 760fcf59617SAndrey V. Elsukov sizeof(uint32_t)); 761bf435626SFabien Thomas SECASVAR_LOCK(sav); 762fcf59617SAndrey V. Elsukov if (sav->replay) { 763fcf59617SAndrey V. Elsukov uint32_t replay; 764fcf59617SAndrey V. Elsukov 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); 771fcf59617SAndrey V. Elsukov 772fcf59617SAndrey V. Elsukov bcopy((caddr_t) &replay, mtod(mo, caddr_t) + roff + 773fcf59617SAndrey V. Elsukov sizeof(uint32_t), sizeof(uint32_t)); 77488768458SSam Leffler } 775fcf59617SAndrey V. Elsukov cryptoid = sav->tdb_cryptoid; 776fcf59617SAndrey V. Elsukov if (SAV_ISCTRORGCM(sav)) 777fcf59617SAndrey V. Elsukov cntr = sav->cntr++; 778fcf59617SAndrey V. Elsukov SECASVAR_UNLOCK(sav); 77988768458SSam Leffler 78088768458SSam Leffler /* 78188768458SSam Leffler * Add padding -- better to do it ourselves than use the crypto engine, 78288768458SSam Leffler * although if/when we support compression, we'd have to do that. 78388768458SSam Leffler */ 78488768458SSam Leffler pad = (u_char *) m_pad(m, padding + alen); 78588768458SSam Leffler if (pad == NULL) { 7869ffa9677SSam Leffler DPRINTF(("%s: m_pad failed for SA %s/%08lx\n", __func__, 787962ac6c7SAndrey V. Elsukov ipsec_address(&saidx->dst, buf, sizeof(buf)), 788962ac6c7SAndrey V. Elsukov (u_long) ntohl(sav->spi))); 78988768458SSam Leffler m = NULL; /* NB: free'd by m_pad */ 79088768458SSam Leffler error = ENOBUFS; 79188768458SSam Leffler goto bad; 79288768458SSam Leffler } 79388768458SSam Leffler 79488768458SSam Leffler /* 79588768458SSam Leffler * Add padding: random, zero, or self-describing. 79688768458SSam Leffler * XXX catch unexpected setting 79788768458SSam Leffler */ 79888768458SSam Leffler switch (sav->flags & SADB_X_EXT_PMASK) { 79988768458SSam Leffler case SADB_X_EXT_PRAND: 800a8a16c71SConrad Meyer arc4random_buf(pad, padding - 2); 80188768458SSam Leffler break; 80288768458SSam Leffler case SADB_X_EXT_PZERO: 80388768458SSam Leffler bzero(pad, padding - 2); 80488768458SSam Leffler break; 80588768458SSam Leffler case SADB_X_EXT_PSEQ: 80688768458SSam Leffler for (i = 0; i < padding - 2; i++) 80788768458SSam Leffler pad[i] = i+1; 80888768458SSam Leffler break; 80988768458SSam Leffler } 81088768458SSam Leffler 81188768458SSam Leffler /* Fix padding length and Next Protocol in padding itself. */ 81288768458SSam Leffler pad[padding - 2] = padding - 2; 81388768458SSam Leffler m_copydata(m, protoff, sizeof(u_int8_t), pad + padding - 1); 81488768458SSam Leffler 81588768458SSam Leffler /* Fix Next Protocol in IPv4/IPv6 header. */ 81688768458SSam Leffler prot = IPPROTO_ESP; 81788768458SSam Leffler m_copyback(m, protoff, sizeof(u_int8_t), (u_char *) &prot); 81888768458SSam Leffler 81988768458SSam Leffler /* Get crypto descriptors. */ 820a2bc81bfSJohn-Mark Gurney crp = crypto_getreq(esph != NULL ? 2 : 1); 82188768458SSam Leffler if (crp == NULL) { 8229ffa9677SSam Leffler DPRINTF(("%s: failed to acquire crypto descriptors\n", 8239ffa9677SSam Leffler __func__)); 824a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_crypto); 82588768458SSam Leffler error = ENOBUFS; 82688768458SSam Leffler goto bad; 82788768458SSam Leffler } 82888768458SSam Leffler 829a2bc81bfSJohn-Mark Gurney /* IPsec-specific opaque crypto info. */ 830fcf59617SAndrey V. Elsukov xd = malloc(sizeof(struct xform_data), M_XDATA, M_NOWAIT | M_ZERO); 831fcf59617SAndrey V. Elsukov if (xd == NULL) { 832a2bc81bfSJohn-Mark Gurney crypto_freereq(crp); 833fcf59617SAndrey V. Elsukov DPRINTF(("%s: failed to allocate xform_data\n", __func__)); 834a2bc81bfSJohn-Mark Gurney ESPSTAT_INC(esps_crypto); 835a2bc81bfSJohn-Mark Gurney error = ENOBUFS; 836a2bc81bfSJohn-Mark Gurney goto bad; 837a2bc81bfSJohn-Mark Gurney } 838a2bc81bfSJohn-Mark Gurney 83988768458SSam Leffler crde = crp->crp_desc; 84088768458SSam Leffler crda = crde->crd_next; 84188768458SSam Leffler 84288768458SSam Leffler /* Encryption descriptor. */ 84388768458SSam Leffler crde->crd_skip = skip + hlen; 84488768458SSam Leffler crde->crd_len = m->m_pkthdr.len - (skip + hlen + alen); 84588768458SSam Leffler crde->crd_flags = CRD_F_ENCRYPT; 84688768458SSam Leffler crde->crd_inject = skip + hlen - sav->ivlen; 84788768458SSam Leffler 84888768458SSam Leffler /* Encryption operation. */ 84988768458SSam Leffler crde->crd_alg = espx->type; 850a2bc81bfSJohn-Mark Gurney if (SAV_ISCTRORGCM(sav)) { 851a2bc81bfSJohn-Mark Gurney ivp = &crde->crd_iv[0]; 85288768458SSam Leffler 853a2bc81bfSJohn-Mark Gurney /* GCM IV Format: RFC4106 4 */ 854a2bc81bfSJohn-Mark Gurney /* CTR IV Format: RFC3686 4 */ 855a2bc81bfSJohn-Mark Gurney /* Salt is last four bytes of key, RFC4106 8.1 */ 856a2bc81bfSJohn-Mark Gurney /* Nonce is last four bytes of key, RFC3686 5.1 */ 857a2bc81bfSJohn-Mark Gurney memcpy(ivp, sav->key_enc->key_data + 858a2bc81bfSJohn-Mark Gurney _KEYLEN(sav->key_enc) - 4, 4); 859a2bc81bfSJohn-Mark Gurney be64enc(&ivp[4], cntr); 860a2bc81bfSJohn-Mark Gurney if (SAV_ISCTR(sav)) { 861a2bc81bfSJohn-Mark Gurney /* Initial block counter is 1, RFC3686 4 */ 862fcf59617SAndrey V. Elsukov /* XXXAE: should we use this only for first packet? */ 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 */ 871fcf59617SAndrey V. Elsukov xd->sp = sp; 872fcf59617SAndrey V. Elsukov xd->sav = sav; 873fcf59617SAndrey V. Elsukov xd->idx = idx; 874fcf59617SAndrey V. Elsukov xd->cryptoid = cryptoid; 875fd40ecf3SJohn Baldwin xd->vnet = curvnet; 87688768458SSam Leffler 87788768458SSam Leffler /* Crypto operation descriptor. */ 87888768458SSam Leffler crp->crp_ilen = m->m_pkthdr.len; /* Total input length. */ 879d8409aafSSam Leffler crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC; 88039bbca6fSFabien Thomas if (V_async_crypto) 88139bbca6fSFabien Thomas crp->crp_flags |= CRYPTO_F_ASYNC | CRYPTO_F_ASYNC_KEEPORDER; 88288768458SSam Leffler crp->crp_buf = (caddr_t) m; 88388768458SSam Leffler crp->crp_callback = esp_output_cb; 884fcf59617SAndrey V. Elsukov crp->crp_opaque = (caddr_t) xd; 8851b0909d5SConrad Meyer crp->crp_session = 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); 9023aee7099SAndrey V. Elsukov key_freesav(&sav); 9033aee7099SAndrey V. Elsukov key_freesp(&sp); 90488768458SSam Leffler return (error); 90588768458SSam Leffler } 90688768458SSam Leffler /* 90788768458SSam Leffler * ESP output callback from the crypto driver. 90888768458SSam Leffler */ 90988768458SSam Leffler static int 91088768458SSam Leffler esp_output_cb(struct cryptop *crp) 91188768458SSam Leffler { 912fcf59617SAndrey V. Elsukov struct xform_data *xd; 913fcf59617SAndrey V. Elsukov struct secpolicy *sp; 91488768458SSam Leffler struct secasvar *sav; 91588768458SSam Leffler struct mbuf *m; 9162e08e39fSConrad Meyer crypto_session_t cryptoid; 917fcf59617SAndrey V. Elsukov u_int idx; 9180e4fb1dbSPawel Jakub Dawidek int error; 91988768458SSam Leffler 920fcf59617SAndrey V. Elsukov xd = (struct xform_data *) crp->crp_opaque; 921fd40ecf3SJohn Baldwin CURVNET_SET(xd->vnet); 92288768458SSam Leffler m = (struct mbuf *) crp->crp_buf; 923fcf59617SAndrey V. Elsukov sp = xd->sp; 924fcf59617SAndrey V. Elsukov sav = xd->sav; 925fcf59617SAndrey V. Elsukov idx = xd->idx; 926fcf59617SAndrey V. Elsukov cryptoid = xd->cryptoid; 92788768458SSam Leffler 92888768458SSam Leffler /* Check for crypto errors. */ 92988768458SSam Leffler if (crp->crp_etype) { 93088768458SSam Leffler if (crp->crp_etype == EAGAIN) { 931fcf59617SAndrey V. Elsukov /* Reset the session ID */ 9321b0909d5SConrad Meyer if (ipsec_updateid(sav, &crp->crp_session, &cryptoid) != 0) 933fcf59617SAndrey V. Elsukov crypto_freesession(cryptoid); 9341b0909d5SConrad Meyer xd->cryptoid = crp->crp_session; 935fd40ecf3SJohn Baldwin CURVNET_RESTORE(); 9360a95a08eSPawel Jakub Dawidek return (crypto_dispatch(crp)); 93788768458SSam Leffler } 938a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_noxform); 9399ffa9677SSam Leffler DPRINTF(("%s: crypto error %d\n", __func__, crp->crp_etype)); 94088768458SSam Leffler error = crp->crp_etype; 941fcf59617SAndrey V. Elsukov m_freem(m); 94288768458SSam Leffler goto bad; 94388768458SSam Leffler } 94488768458SSam Leffler 94588768458SSam Leffler /* Shouldn't happen... */ 94688768458SSam Leffler if (m == NULL) { 947a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_crypto); 9489ffa9677SSam Leffler DPRINTF(("%s: bogus returned buffer from crypto\n", __func__)); 94988768458SSam Leffler error = EINVAL; 95088768458SSam Leffler goto bad; 95188768458SSam Leffler } 952fcf59617SAndrey V. Elsukov free(xd, M_XDATA); 953fcf59617SAndrey V. Elsukov crypto_freereq(crp); 954a04d64d8SAndrey V. Elsukov ESPSTAT_INC(esps_hist[sav->alg_enc]); 95588768458SSam Leffler if (sav->tdb_authalgxform != NULL) 956a04d64d8SAndrey V. Elsukov AHSTAT_INC(ahs_hist[sav->alg_auth]); 95788768458SSam Leffler 9586131838bSPawel Jakub Dawidek #ifdef REGRESSION 959dfa9422bSPawel Jakub Dawidek /* Emulate man-in-the-middle attack when ipsec_integrity is TRUE. */ 960603724d3SBjoern A. Zeeb if (V_ipsec_integrity) { 961442da28aSVANHULLEBUS Yvan static unsigned char ipseczeroes[AH_HMAC_MAXHASHLEN]; 962fcf59617SAndrey V. Elsukov const struct auth_hash *esph; 963dfa9422bSPawel Jakub Dawidek 964dfa9422bSPawel Jakub Dawidek /* 965dfa9422bSPawel Jakub Dawidek * Corrupt HMAC if we want to test integrity verification of 966dfa9422bSPawel Jakub Dawidek * the other side. 967dfa9422bSPawel Jakub Dawidek */ 968dfa9422bSPawel Jakub Dawidek esph = sav->tdb_authalgxform; 969dfa9422bSPawel Jakub Dawidek if (esph != NULL) { 970442da28aSVANHULLEBUS Yvan int alen; 971442da28aSVANHULLEBUS Yvan 972a09a7146SJohn-Mark Gurney alen = xform_ah_authsize(esph); 973442da28aSVANHULLEBUS Yvan m_copyback(m, m->m_pkthdr.len - alen, 974442da28aSVANHULLEBUS Yvan alen, ipseczeroes); 975dfa9422bSPawel Jakub Dawidek } 976dfa9422bSPawel Jakub Dawidek } 9776131838bSPawel Jakub Dawidek #endif 978dfa9422bSPawel Jakub Dawidek 97988768458SSam Leffler /* NB: m is reclaimed by ipsec_process_done. */ 980fcf59617SAndrey V. Elsukov error = ipsec_process_done(m, sp, sav, idx); 981fd40ecf3SJohn Baldwin CURVNET_RESTORE(); 9823d80e82dSAndrey V. Elsukov return (error); 98388768458SSam Leffler bad: 984fd40ecf3SJohn Baldwin CURVNET_RESTORE(); 985fcf59617SAndrey V. Elsukov free(xd, M_XDATA); 98688768458SSam Leffler crypto_freereq(crp); 987fcf59617SAndrey V. Elsukov key_freesav(&sav); 988fcf59617SAndrey V. Elsukov key_freesp(&sp); 9893d80e82dSAndrey V. Elsukov return (error); 99088768458SSam Leffler } 99188768458SSam Leffler 99288768458SSam Leffler static struct xformsw esp_xformsw = { 993fcf59617SAndrey V. Elsukov .xf_type = XF_ESP, 994fcf59617SAndrey V. Elsukov .xf_name = "IPsec ESP", 995fcf59617SAndrey V. Elsukov .xf_init = esp_init, 996fcf59617SAndrey V. Elsukov .xf_zeroize = esp_zeroize, 997fcf59617SAndrey V. Elsukov .xf_input = esp_input, 998fcf59617SAndrey V. Elsukov .xf_output = esp_output, 99988768458SSam Leffler }; 100088768458SSam Leffler 1001fcf59617SAndrey V. Elsukov SYSINIT(esp_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 1002fcf59617SAndrey V. Elsukov xform_attach, &esp_xformsw); 1003fcf59617SAndrey V. Elsukov SYSUNINIT(esp_xform_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 1004fcf59617SAndrey V. Elsukov xform_detach, &esp_xformsw); 1005