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src/sbin/iked/ikev2_pld.c

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/* $OpenBSD: ikev2_pld.c,v 1.135 2024/04/02 19:58:28 tobhe Exp $ */
/*
* Copyright (c) 2019 Tobias Heider <tobias.heider@stusta.de>
* Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2014 Hans-Joerg Hoexer
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <endian.h>
#include <errno.h>
#include <err.h>
#include <event.h>
#include <openssl/sha.h>
#include <openssl/evp.h>
#include "iked.h"
#include "ikev2.h"
#include "eap.h"
#include "dh.h"
int ikev2_validate_pld(struct iked_message *, size_t, size_t,
struct ikev2_payload *);
int ikev2_pld_payloads(struct iked *, struct iked_message *,
size_t, size_t, unsigned int);
int ikev2_validate_sa(struct iked_message *, size_t, size_t,
struct ikev2_sa_proposal *);
int ikev2_pld_sa(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_validate_xform(struct iked_message *, size_t, size_t,
struct ikev2_transform *);
int ikev2_pld_xform(struct iked *, struct iked_message *,
size_t, size_t);
int ikev2_validate_attr(struct iked_message *, size_t, size_t,
struct ikev2_attribute *);
int ikev2_pld_attr(struct iked *, struct ikev2_transform *,
struct iked_message *, size_t, size_t);
int ikev2_validate_ke(struct iked_message *, size_t, size_t,
struct ikev2_keyexchange *);
int ikev2_pld_ke(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_validate_id(struct iked_message *, size_t, size_t,
struct ikev2_id *);
int ikev2_pld_id(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t, unsigned int);
int ikev2_validate_cert(struct iked_message *, size_t, size_t,
struct ikev2_cert *);
int ikev2_pld_cert(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_validate_certreq(struct iked_message *, size_t, size_t,
struct ikev2_cert *);
int ikev2_pld_certreq(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_pld_nonce(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_validate_notify(struct iked_message *, size_t, size_t,
struct ikev2_notify *);
int ikev2_pld_notify(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_validate_delete(struct iked_message *, size_t, size_t,
struct ikev2_delete *);
int ikev2_pld_delete(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_validate_tss(struct iked_message *, size_t, size_t,
struct ikev2_tsp *);
int ikev2_pld_tss(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_validate_ts(struct iked_message *, size_t, size_t,
struct ikev2_ts *);
int ikev2_pld_ts(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t, unsigned int);
int ikev2_validate_auth(struct iked_message *, size_t, size_t,
struct ikev2_auth *);
int ikev2_pld_auth(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_pld_e(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_pld_ef(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left);
int ikev2_frags_reassemble(struct iked *env,
struct ikev2_payload *pld, struct iked_message *msg);
int ikev2_validate_cp(struct iked_message *, size_t, size_t,
struct ikev2_cp *);
int ikev2_pld_cp(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int ikev2_validate_eap(struct iked_message *, size_t, size_t,
struct eap_header *);
int ikev2_pld_eap(struct iked *, struct ikev2_payload *,
struct iked_message *, size_t, size_t);
int
ikev2_pld_parse(struct iked *env, struct ike_header *hdr,
struct iked_message *msg, size_t offset)
{
log_debug("%s: header ispi %s rspi %s"
" nextpayload %s version 0x%02x exchange %s flags 0x%02x"
" msgid %d length %u response %d", __func__,
print_spi(betoh64(hdr->ike_ispi), 8),
print_spi(betoh64(hdr->ike_rspi), 8),
print_map(hdr->ike_nextpayload, ikev2_payload_map),
hdr->ike_version,
print_map(hdr->ike_exchange, ikev2_exchange_map),
hdr->ike_flags,
betoh32(hdr->ike_msgid),
betoh32(hdr->ike_length),
msg->msg_response);
if (ibuf_size(msg->msg_data) < betoh32(hdr->ike_length)) {
log_debug("%s: short message", __func__);
return (-1);
}
offset += sizeof(*hdr);
return (ikev2_pld_payloads(env, msg, offset,
betoh32(hdr->ike_length), hdr->ike_nextpayload));
}
int
ikev2_validate_pld(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_payload *pld)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
size_t pld_length;
/* We need at least the generic header. */
if (left < sizeof(*pld)) {
log_debug("%s: malformed payload: too short for generic "
"header (%zu < %zu)", __func__, left, sizeof(*pld));
return (-1);
}
memcpy(pld, msgbuf + offset, sizeof(*pld));
/*
* We need at least the specified number of bytes.
* pld_length is the full size of the payload including
* the generic payload header.
*/
pld_length = betoh16(pld->pld_length);
if (left < pld_length) {
log_debug("%s: malformed payload: shorter than specified "
"(%zu < %zu)", __func__, left, pld_length);
return (-1);
}
/*
* Sanity check the specified payload size, it must
* be at least the size of the generic payload header.
*/
if (pld_length < sizeof(*pld)) {
log_debug("%s: malformed payload: shorter than minimum "
"header size (%zu < %zu)", __func__, pld_length,
sizeof(*pld));
return (-1);
}
return (0);
}
int
ikev2_pld_payloads(struct iked *env, struct iked_message *msg,
size_t offset, size_t length, unsigned int payload)
{
struct ikev2_payload pld;
unsigned int e;
int ret;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
size_t total, left;
/* Check if message was decrypted in an E payload */
e = msg->msg_e ? IKED_E : 0;
/* Bytes left in datagram. */
total = length - offset;
while (payload != 0 && offset < length) {
if (ikev2_validate_pld(msg, offset, total, &pld))
return (-1);
log_debug("%s: %spayload %s"
" nextpayload %s critical 0x%02x length %d",
__func__, e ? "decrypted " : "",
print_map(payload, ikev2_payload_map),
print_map(pld.pld_nextpayload, ikev2_payload_map),
pld.pld_reserved & IKEV2_CRITICAL_PAYLOAD,
betoh16(pld.pld_length));
/* Skip over generic payload header. */
offset += sizeof(pld);
total -= sizeof(pld);
left = betoh16(pld.pld_length) - sizeof(pld);
ret = 0;
switch (payload | e) {
case IKEV2_PAYLOAD_SA:
case IKEV2_PAYLOAD_SA | IKED_E:
ret = ikev2_pld_sa(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_KE:
case IKEV2_PAYLOAD_KE | IKED_E:
ret = ikev2_pld_ke(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_IDi | IKED_E:
case IKEV2_PAYLOAD_IDr | IKED_E:
ret = ikev2_pld_id(env, &pld, msg, offset, left,
payload);
break;
case IKEV2_PAYLOAD_CERT | IKED_E:
ret = ikev2_pld_cert(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_CERTREQ:
case IKEV2_PAYLOAD_CERTREQ | IKED_E:
ret = ikev2_pld_certreq(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_AUTH | IKED_E:
ret = ikev2_pld_auth(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_NONCE:
case IKEV2_PAYLOAD_NONCE | IKED_E:
ret = ikev2_pld_nonce(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_NOTIFY:
case IKEV2_PAYLOAD_NOTIFY | IKED_E:
ret = ikev2_pld_notify(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_DELETE | IKED_E:
ret = ikev2_pld_delete(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_TSi | IKED_E:
case IKEV2_PAYLOAD_TSr | IKED_E:
ret = ikev2_pld_tss(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_SK:
ret = ikev2_pld_e(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_SKF:
ret = ikev2_pld_ef(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_CP | IKED_E:
ret = ikev2_pld_cp(env, &pld, msg, offset, left);
break;
case IKEV2_PAYLOAD_EAP | IKED_E:
ret = ikev2_pld_eap(env, &pld, msg, offset, left);
break;
default:
print_hex(msgbuf, offset,
betoh16(pld.pld_length) - sizeof(pld));
break;
}
if (ret != 0 && ikev2_msg_frompeer(msg)) {
(void)ikev2_send_informational(env, msg);
return (-1);
}
/* Encrypted payloads must appear last */
if ((payload == IKEV2_PAYLOAD_SK) ||
(payload == IKEV2_PAYLOAD_SKF))
return (0);
payload = pld.pld_nextpayload;
offset += left;
total -= left;
}
return (0);
}
int
ikev2_validate_sa(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_sa_proposal *sap)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
size_t sap_length;
if (left < sizeof(*sap)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*sap));
return (-1);
}
memcpy(sap, msgbuf + offset, sizeof(*sap));
sap_length = betoh16(sap->sap_length);
if (sap_length < sizeof(*sap)) {
log_debug("%s: malformed payload: shorter than minimum header "
"size (%zu < %zu)", __func__, sap_length, sizeof(*sap));
return (-1);
}
if (left < sap_length) {
log_debug("%s: malformed payload: too long for actual payload "
"size (%zu < %zu)", __func__, left, sap_length);
return (-1);
}
/*
* If there is only one proposal, sap_length must be the
* total payload size.
*/
if (!sap->sap_more && left != sap_length) {
log_debug("%s: malformed payload: SA payload length mismatches "
"single proposal substructure length (%zu != %zu)",
__func__, left, sap_length);
return (-1);
}
/*
* If there are more than one proposal, there must be bytes
* left in the payload.
*/
if (sap->sap_more && left <= sap_length) {
log_debug("%s: malformed payload: SA payload too small for "
"further proposals (%zu <= %zu)", __func__,
left, sap_length);
return (-1);
}
return (0);
}
int
ikev2_pld_sa(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct ikev2_sa_proposal sap;
struct iked_proposal *prop = NULL;
uint32_t spi32;
uint64_t spi = 0, spi64;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
int r;
struct iked_proposals *props;
size_t total;
do {
if (ikev2_validate_sa(msg, offset, left, &sap))
return (-1);
/* Assumed size of the first proposals, including SPI if present. */
total = (betoh16(sap.sap_length) - sizeof(sap));
props = &msg->msg_parent->msg_proposals;
offset += sizeof(sap);
left -= sizeof(sap);
if (sap.sap_spisize) {
if (left < sap.sap_spisize) {
log_debug("%s: malformed payload: SPI larger than "
"actual payload (%zu < %d)", __func__, left,
sap.sap_spisize);
return (-1);
}
if (total < sap.sap_spisize) {
log_debug("%s: malformed payload: SPI larger than "
"proposal (%zu < %d)", __func__, total,
sap.sap_spisize);
return (-1);
}
switch (sap.sap_spisize) {
case 4:
memcpy(&spi32, msgbuf + offset, 4);
spi = betoh32(spi32);
break;
case 8:
memcpy(&spi64, msgbuf + offset, 8);
spi = betoh64(spi64);
break;
default:
log_debug("%s: unsupported SPI size %d",
__func__, sap.sap_spisize);
return (-1);
}
offset += sap.sap_spisize;
left -= sap.sap_spisize;
/* Assumed size of the proposal, now without SPI. */
total -= sap.sap_spisize;
}
/*
* As we verified sanity of packet headers, this check will
* be always false, but just to be sure we keep it.
*/
if (left < total) {
log_debug("%s: malformed payload: too long for payload "
"(%zu < %zu)", __func__, left, total);
return (-1);
}
log_debug("%s: more %d reserved %d length %d"
" proposal #%d protoid %s spisize %d xforms %d spi %s",
__func__, sap.sap_more, sap.sap_reserved,
betoh16(sap.sap_length), sap.sap_proposalnr,
print_map(sap.sap_protoid, ikev2_saproto_map), sap.sap_spisize,
sap.sap_transforms, print_spi(spi, sap.sap_spisize));
if (ikev2_msg_frompeer(msg)) {
if ((msg->msg_parent->msg_prop = config_add_proposal(props,
sap.sap_proposalnr, sap.sap_protoid)) == NULL) {
log_debug("%s: invalid proposal", __func__);
return (-1);
}
prop = msg->msg_parent->msg_prop;
prop->prop_peerspi.spi = spi;
prop->prop_peerspi.spi_protoid = sap.sap_protoid;
prop->prop_peerspi.spi_size = sap.sap_spisize;
prop->prop_localspi.spi_protoid = sap.sap_protoid;
prop->prop_localspi.spi_size = sap.sap_spisize;
}
/*
* Parse the attached transforms
*/
if (sap.sap_transforms) {
r = ikev2_pld_xform(env, msg, offset, total);
if ((r == -2) && ikev2_msg_frompeer(msg)) {
log_debug("%s: invalid proposal transform",
__func__);
/* cleanup and ignore proposal */
config_free_proposal(props, prop);
prop = msg->msg_parent->msg_prop = NULL;
} else if (r != 0) {
log_debug("%s: invalid proposal transforms",
__func__);
return (-1);
}
}
offset += total;
left -= total;
} while (sap.sap_more);
return (0);
}
int
ikev2_validate_xform(struct iked_message *msg, size_t offset, size_t total,
struct ikev2_transform *xfrm)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
size_t xfrm_length;
if (total < sizeof(*xfrm)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, total, sizeof(*xfrm));
return (-1);
}
memcpy(xfrm, msgbuf + offset, sizeof(*xfrm));
xfrm_length = betoh16(xfrm->xfrm_length);
if (xfrm_length < sizeof(*xfrm)) {
log_debug("%s: malformed payload: shorter than minimum header "
"size (%zu < %zu)", __func__, xfrm_length, sizeof(*xfrm));
return (-1);
}
if (total < xfrm_length) {
log_debug("%s: malformed payload: too long for payload size "
"(%zu < %zu)", __func__, total, xfrm_length);
return (-1);
}
return (0);
}
int
ikev2_pld_xform(struct iked *env, struct iked_message *msg,
size_t offset, size_t total)
{
struct ikev2_transform xfrm;
char id[BUFSIZ];
int ret = 0;
int r;
size_t xfrm_length;
if (ikev2_validate_xform(msg, offset, total, &xfrm))
return (-1);
xfrm_length = betoh16(xfrm.xfrm_length);
switch (xfrm.xfrm_type) {
case IKEV2_XFORMTYPE_ENCR:
strlcpy(id, print_map(betoh16(xfrm.xfrm_id),
ikev2_xformencr_map), sizeof(id));
break;
case IKEV2_XFORMTYPE_PRF:
strlcpy(id, print_map(betoh16(xfrm.xfrm_id),
ikev2_xformprf_map), sizeof(id));
break;
case IKEV2_XFORMTYPE_INTEGR:
strlcpy(id, print_map(betoh16(xfrm.xfrm_id),
ikev2_xformauth_map), sizeof(id));
break;
case IKEV2_XFORMTYPE_DH:
strlcpy(id, print_map(betoh16(xfrm.xfrm_id),
ikev2_xformdh_map), sizeof(id));
break;
case IKEV2_XFORMTYPE_ESN:
strlcpy(id, print_map(betoh16(xfrm.xfrm_id),
ikev2_xformesn_map), sizeof(id));
break;
default:
snprintf(id, sizeof(id), "<%d>", betoh16(xfrm.xfrm_id));
break;
}
log_debug("%s: more %d reserved %d length %zu"
" type %s id %s",
__func__, xfrm.xfrm_more, xfrm.xfrm_reserved, xfrm_length,
print_map(xfrm.xfrm_type, ikev2_xformtype_map), id);
/*
* Parse transform attributes, if available
*/
msg->msg_attrlength = 0;
if (xfrm_length > sizeof(xfrm)) {
if (ikev2_pld_attr(env, &xfrm, msg, offset + sizeof(xfrm),
xfrm_length - sizeof(xfrm)) != 0) {
return (-1);
}
}
if (ikev2_msg_frompeer(msg)) {
r = config_add_transform(msg->msg_parent->msg_prop,
xfrm.xfrm_type, betoh16(xfrm.xfrm_id),
msg->msg_attrlength, msg->msg_attrlength);
if (r == -1) {
log_debug("%s: failed to add transform: alloc error",
__func__);
return (r);
} else if (r == -2) {
log_debug("%s: failed to add transform: unknown type",
__func__);
return (r);
}
}
/* Next transform */
offset += xfrm_length;
total -= xfrm_length;
if (xfrm.xfrm_more == IKEV2_XFORM_MORE)
ret = ikev2_pld_xform(env, msg, offset, total);
else if (total != 0) {
/* No more transforms but still some data left. */
log_debug("%s: less data than specified, %zu bytes left",
__func__, total);
ret = -1;
}
return (ret);
}
int
ikev2_validate_attr(struct iked_message *msg, size_t offset, size_t total,
struct ikev2_attribute *attr)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (total < sizeof(*attr)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, total, sizeof(*attr));
return (-1);
}
memcpy(attr, msgbuf + offset, sizeof(*attr));
return (0);
}
int
ikev2_pld_attr(struct iked *env, struct ikev2_transform *xfrm,
struct iked_message *msg, size_t offset, size_t total)
{
struct ikev2_attribute attr;
unsigned int type;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
int ret = 0;
size_t attr_length;
if (ikev2_validate_attr(msg, offset, total, &attr))
return (-1);
type = betoh16(attr.attr_type) & ~IKEV2_ATTRAF_TV;
log_debug("%s: attribute type %s length %d total %zu",
__func__, print_map(type, ikev2_attrtype_map),
betoh16(attr.attr_length), total);
if (betoh16(attr.attr_type) & IKEV2_ATTRAF_TV) {
/* Type-Value attribute */
offset += sizeof(attr);
total -= sizeof(attr);
if (type == IKEV2_ATTRTYPE_KEY_LENGTH)
msg->msg_attrlength = betoh16(attr.attr_length);
} else {
/* Type-Length-Value attribute */
attr_length = betoh16(attr.attr_length);
if (attr_length < sizeof(attr)) {
log_debug("%s: malformed payload: shorter than "
"minimum header size (%zu < %zu)", __func__,
attr_length, sizeof(attr));
return (-1);
}
if (total < attr_length) {
log_debug("%s: malformed payload: attribute larger "
"than actual payload (%zu < %zu)", __func__,
total, attr_length);
return (-1);
}
print_hex(msgbuf, offset + sizeof(attr),
attr_length - sizeof(attr));
offset += attr_length;
total -= attr_length;
}
if (total > 0) {
/* Next attribute */
ret = ikev2_pld_attr(env, xfrm, msg, offset, total);
}
return (ret);
}
int
ikev2_validate_ke(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_keyexchange *kex)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*kex)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*kex));
return (-1);
}
memcpy(kex, msgbuf + offset, sizeof(*kex));
return (0);
}
int
ikev2_pld_ke(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct ikev2_keyexchange kex;
uint8_t *buf;
size_t len;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (ikev2_validate_ke(msg, offset, left, &kex))
return (-1);
log_debug("%s: dh group %s reserved %d", __func__,
print_map(betoh16(kex.kex_dhgroup), ikev2_xformdh_map),
betoh16(kex.kex_reserved));
buf = msgbuf + offset + sizeof(kex);
len = left - sizeof(kex);
if (len == 0) {
log_debug("%s: malformed payload: no KE data given", __func__);
return (-1);
}
print_hex(buf, 0, len);
if (ikev2_msg_frompeer(msg)) {
if (msg->msg_parent->msg_ke != NULL) {
log_info("%s: duplicate KE payload", __func__);
return (-1);
}
if ((msg->msg_parent->msg_ke = ibuf_new(buf, len)) == NULL) {
log_debug("%s: failed to get exchange", __func__);
return (-1);
}
msg->msg_parent->msg_dhgroup = betoh16(kex.kex_dhgroup);
}
return (0);
}
int
ikev2_validate_id(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_id *id)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*id)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*id));
return (-1);
}
memcpy(id, msgbuf + offset, sizeof(*id));
if (id->id_type == IKEV2_ID_NONE) {
log_debug("%s: malformed payload: invalid ID type.",
__func__);
return (-1);
}
return (0);
}
int
ikev2_pld_id(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left, unsigned int payload)
{
uint8_t *ptr;
struct ikev2_id id;
size_t len;
struct iked_id *idp, idb;
const struct iked_sa *sa = msg->msg_sa;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
char idstr[IKED_ID_SIZE];
if (ikev2_validate_id(msg, offset, left, &id))
return (-1);
bzero(&idb, sizeof(idb));
/* Don't strip the Id payload header */
ptr = msgbuf + offset;
len = left;
idb.id_type = id.id_type;
idb.id_offset = sizeof(id);
if ((idb.id_buf = ibuf_new(ptr, len)) == NULL)
return (-1);
if (ikev2_print_id(&idb, idstr, sizeof(idstr)) == -1) {
ibuf_free(idb.id_buf);
log_debug("%s: malformed id", __func__);
return (-1);
}
log_debug("%s: id %s length %zu", __func__, idstr, len);
if (!ikev2_msg_frompeer(msg)) {
ibuf_free(idb.id_buf);
return (0);
}
if (((sa->sa_hdr.sh_initiator && payload == IKEV2_PAYLOAD_IDr) ||
(!sa->sa_hdr.sh_initiator && payload == IKEV2_PAYLOAD_IDi)))
idp = &msg->msg_parent->msg_peerid;
else if (!sa->sa_hdr.sh_initiator && payload == IKEV2_PAYLOAD_IDr)
idp = &msg->msg_parent->msg_localid;
else {
ibuf_free(idb.id_buf);
log_debug("%s: unexpected id payload", __func__);
return (0);
}
if (idp->id_type) {
ibuf_free(idb.id_buf);
log_debug("%s: duplicate id payload", __func__);
return (-1);
}
idp->id_buf = idb.id_buf;
idp->id_offset = idb.id_offset;
idp->id_type = idb.id_type;
return (0);
}
int
ikev2_validate_cert(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_cert *cert)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*cert)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*cert));
return (-1);
}
memcpy(cert, msgbuf + offset, sizeof(*cert));
if (cert->cert_type == IKEV2_CERT_NONE) {
log_debug("%s: malformed payload: invalid cert type", __func__);
return (-1);
}
return (0);
}
int
ikev2_pld_cert(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct ikev2_cert cert;
uint8_t *buf;
size_t len;
struct iked_id *certid;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
const struct iked_sa *sa = msg->msg_sa;
int i;
if (ikev2_validate_cert(msg, offset, left, &cert))
return (-1);
offset += sizeof(cert);
buf = msgbuf + offset;
len = left - sizeof(cert);
log_debug("%s: type %s length %zu",
__func__, print_map(cert.cert_type, ikev2_cert_map), len);
print_hex(buf, 0, len);
if (!ikev2_msg_frompeer(msg))
return (0);
/* do not accept internal encoding in the wire */
if (cert.cert_type == IKEV2_CERT_BUNDLE) {
log_debug("%s: ignoring IKEV2_CERT_BUNDLE",
SPI_SA(sa, __func__));
return (0);
}
certid = &msg->msg_parent->msg_cert;
if (certid->id_type) {
/* try to set supplemental certs */
for (i = 0; i < IKED_SCERT_MAX; i++) {
certid = &msg->msg_parent->msg_scert[i];
if (!certid->id_type)
break;
}
if (certid->id_type) {
log_debug("%s: too many cert payloads, ignoring",
SPI_SA(sa, __func__));
return (0);
}
}
if ((certid->id_buf = ibuf_new(buf, len)) == NULL) {
log_debug("%s: failed to save cert", __func__);
return (-1);
}
certid->id_type = cert.cert_type;
certid->id_offset = 0;
return (0);
}
int
ikev2_validate_certreq(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_cert *cert)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*cert)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*cert));
return (-1);
}
memcpy(cert, msgbuf + offset, sizeof(*cert));
return (0);
}
int
ikev2_pld_certreq(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct ikev2_cert cert;
struct iked_certreq *cr;
uint8_t *buf;
ssize_t len;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (ikev2_validate_certreq(msg, offset, left, &cert))
return (-1);
offset += sizeof(cert);
buf = msgbuf + offset;
len = left - sizeof(cert);
log_debug("%s: type %s length %zd",
__func__, print_map(cert.cert_type, ikev2_cert_map), len);
print_hex(buf, 0, len);
if (!ikev2_msg_frompeer(msg))
return (0);
if (cert.cert_type == IKEV2_CERT_X509_CERT) {
if (len == 0) {
log_info("%s: invalid length 0", __func__);
return (0);
}
if ((len % SHA_DIGEST_LENGTH) != 0) {
log_info("%s: invalid certificate request",
__func__);
return (-1);
}
}
if ((cr = calloc(1, sizeof(struct iked_certreq))) == NULL) {
log_info("%s: failed to allocate certreq.", __func__);
return (-1);
}
if ((cr->cr_data = ibuf_new(buf, len)) == NULL) {
log_info("%s: failed to allocate buffer.", __func__);
free(cr);
return (-1);
}
cr->cr_type = cert.cert_type;
SIMPLEQ_INSERT_TAIL(&msg->msg_parent->msg_certreqs, cr, cr_entry);
return (0);
}
int
ikev2_validate_auth(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_auth *auth)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*auth)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*auth));
return (-1);
}
memcpy(auth, msgbuf + offset, sizeof(*auth));
if (auth->auth_method == 0) {
log_info("%s: malformed payload: invalid auth method",
__func__);
return (-1);
}
return (0);
}
int
ikev2_pld_auth(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct ikev2_auth auth;
struct iked_id *idp;
uint8_t *buf;
size_t len;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (ikev2_validate_auth(msg, offset, left, &auth))
return (-1);
offset += sizeof(auth);
buf = msgbuf + offset;
len = left - sizeof(auth);
log_debug("%s: method %s length %zu",
__func__, print_map(auth.auth_method, ikev2_auth_map), len);
print_hex(buf, 0, len);
if (!ikev2_msg_frompeer(msg))
return (0);
idp = &msg->msg_parent->msg_auth;
if (idp->id_type) {
log_debug("%s: duplicate auth payload", __func__);
return (-1);
}
ibuf_free(idp->id_buf);
idp->id_type = auth.auth_method;
idp->id_offset = 0;
if ((idp->id_buf = ibuf_new(buf, len)) == NULL)
return (-1);
return (0);
}
int
ikev2_pld_nonce(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
size_t len;
uint8_t *buf;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
buf = msgbuf + offset;
len = left;
if (len == 0) {
log_debug("%s: malformed payload: no NONCE given", __func__);
return (-1);
}
print_hex(buf, 0, len);
if (ikev2_msg_frompeer(msg)) {
if (msg->msg_parent->msg_nonce != NULL) {
log_info("%s: duplicate NONCE payload", __func__);
return (-1);
}
if ((msg->msg_nonce = ibuf_new(buf, len)) == NULL) {
log_debug("%s: failed to get peer nonce", __func__);
return (-1);
}
msg->msg_parent->msg_nonce = msg->msg_nonce;
}
return (0);
}
int
ikev2_validate_notify(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_notify *n)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*n)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*n));
return (-1);
}
memcpy(n, msgbuf + offset, sizeof(*n));
return (0);
}
int
ikev2_pld_notify(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct ikev2_notify n;
const struct iked_sa *sa = msg->msg_sa;
uint8_t *buf, md[SHA_DIGEST_LENGTH];
uint32_t spi32;
uint64_t spi64;
struct iked_spi *rekey;
uint16_t type;
uint16_t signature_hash;
if (ikev2_validate_notify(msg, offset, left, &n))
return (-1);
type = betoh16(n.n_type);
log_debug("%s: protoid %s spisize %d type %s",
__func__,
print_map(n.n_protoid, ikev2_saproto_map), n.n_spisize,
print_map(type, ikev2_n_map));
left -= sizeof(n);
if ((buf = ibuf_seek(msg->msg_data, offset + sizeof(n), left)) == NULL)
return (-1);
print_hex(buf, 0, left);
if (!ikev2_msg_frompeer(msg))
return (0);
switch (type) {
case IKEV2_N_NAT_DETECTION_SOURCE_IP:
case IKEV2_N_NAT_DETECTION_DESTINATION_IP:
if (left != sizeof(md)) {
log_debug("%s: malformed payload: hash size mismatch"
" (%zu != %zu)", __func__, left, sizeof(md));
return (-1);
}
if (ikev2_nat_detection(env, msg, md, sizeof(md), type,
ikev2_msg_frompeer(msg)) == -1)
return (-1);
if (memcmp(buf, md, left) != 0) {
log_debug("%s: %s detected NAT", __func__,
print_map(type, ikev2_n_map));
if (type == IKEV2_N_NAT_DETECTION_SOURCE_IP)
msg->msg_parent->msg_nat_detected
|= IKED_MSG_NAT_SRC_IP;
else
msg->msg_parent->msg_nat_detected
|= IKED_MSG_NAT_DST_IP;
}
print_hex(md, 0, sizeof(md));
/* remember for MOBIKE */
msg->msg_parent->msg_natt_rcvd = 1;
break;
case IKEV2_N_AUTHENTICATION_FAILED:
if (!msg->msg_e) {
log_debug("%s: AUTHENTICATION_FAILED not encrypted",
__func__);
return (-1);
}
/*
* If we are the responder, then we only accept
* AUTHENTICATION_FAILED from authenticated peers.
* If we are the initiator, the peer cannot be authenticated.
*/
if (!sa->sa_hdr.sh_initiator) {
if (!sa_stateok(sa, IKEV2_STATE_VALID)) {
log_debug("%s: ignoring AUTHENTICATION_FAILED"
" from unauthenticated initiator",
__func__);
return (-1);
}
} else {
if (sa_stateok(sa, IKEV2_STATE_VALID)) {
log_debug("%s: ignoring AUTHENTICATION_FAILED"
" from authenticated responder",
__func__);
return (-1);
}
}
msg->msg_parent->msg_flags
|= IKED_MSG_FLAGS_AUTHENTICATION_FAILED;
break;
case IKEV2_N_INVALID_KE_PAYLOAD:
if (sa_stateok(sa, IKEV2_STATE_VALID) &&
!msg->msg_e) {
log_debug("%s: INVALID_KE_PAYLOAD not encrypted",
__func__);
return (-1);
}
if (left != sizeof(msg->msg_parent->msg_group)) {
log_debug("%s: malformed payload: group size mismatch"
" (%zu != %zu)", __func__, left,
sizeof(msg->msg_parent->msg_group));
return (-1);
}
memcpy(&msg->msg_parent->msg_group, buf, left);
msg->msg_parent->msg_flags |= IKED_MSG_FLAGS_INVALID_KE;
break;
case IKEV2_N_NO_ADDITIONAL_SAS:
if (!msg->msg_e) {
log_debug("%s: NO_ADDITIONAL_SAS not encrypted",
__func__);
return (-1);
}
msg->msg_parent->msg_flags |= IKED_MSG_FLAGS_NO_ADDITIONAL_SAS;
break;
case IKEV2_N_REKEY_SA:
if (!msg->msg_e) {
log_debug("%s: N_REKEY_SA not encrypted", __func__);
return (-1);
}
if (left != n.n_spisize) {
log_debug("%s: malformed notification", __func__);
return (-1);
}
rekey = &msg->msg_parent->msg_rekey;
if (rekey->spi != 0) {
log_debug("%s: rekeying of multiple SAs not supported",
__func__);
return (-1);
}
switch (n.n_spisize) {
case 4:
memcpy(&spi32, buf, left);
rekey->spi = betoh32(spi32);
break;
case 8:
memcpy(&spi64, buf, left);
rekey->spi = betoh64(spi64);
break;
default:
log_debug("%s: invalid spi size %d", __func__,
n.n_spisize);
return (-1);
}
rekey->spi_size = n.n_spisize;
rekey->spi_protoid = n.n_protoid;
log_debug("%s: rekey %s spi %s", __func__,
print_map(n.n_protoid, ikev2_saproto_map),
print_spi(rekey->spi, n.n_spisize));
break;
case IKEV2_N_TEMPORARY_FAILURE:
if (!msg->msg_e) {
log_debug("%s: IKEV2_N_TEMPORARY_FAILURE not encrypted",
__func__);
return (-1);
}
msg->msg_parent->msg_flags |= IKED_MSG_FLAGS_TEMPORARY_FAILURE;
break;
case IKEV2_N_IPCOMP_SUPPORTED:
if (!msg->msg_e) {
log_debug("%s: N_IPCOMP_SUPPORTED not encrypted",
__func__);
return (-1);
}
if (left < sizeof(msg->msg_parent->msg_cpi) +
sizeof(msg->msg_parent->msg_transform)) {
log_debug("%s: ignoring malformed ipcomp notification",
__func__);
return (0);
}
memcpy(&msg->msg_parent->msg_cpi, buf,
sizeof(msg->msg_parent->msg_cpi));
memcpy(&msg->msg_parent->msg_transform,
buf + sizeof(msg->msg_parent->msg_cpi),
sizeof(msg->msg_parent->msg_transform));
log_debug("%s: %s cpi 0x%x, transform %s, length %zu", __func__,
msg->msg_parent->msg_response ? "res" : "req",
betoh16(msg->msg_parent->msg_cpi),
print_map(msg->msg_parent->msg_transform,
ikev2_ipcomp_map), left);
msg->msg_parent->msg_flags |= IKED_MSG_FLAGS_IPCOMP_SUPPORTED;
break;
case IKEV2_N_CHILD_SA_NOT_FOUND:
if (!msg->msg_e) {
log_debug("%s: N_CHILD_SA_NOT_FOUND not encrypted",
__func__);
return (-1);
}
msg->msg_parent->msg_flags |= IKED_MSG_FLAGS_CHILD_SA_NOT_FOUND;
break;
case IKEV2_N_NO_PROPOSAL_CHOSEN:
msg->msg_parent->msg_flags |= IKED_MSG_FLAGS_NO_PROPOSAL_CHOSEN;
break;
case IKEV2_N_MOBIKE_SUPPORTED:
if (!msg->msg_e) {
log_debug("%s: N_MOBIKE_SUPPORTED not encrypted",
__func__);
return (-1);
}
if (left != 0) {
log_debug("%s: ignoring malformed mobike"
" notification: %zu", __func__, left);
return (0);
}
msg->msg_parent->msg_flags |= IKED_MSG_FLAGS_MOBIKE;
break;
case IKEV2_N_USE_TRANSPORT_MODE:
if (!msg->msg_e) {
log_debug("%s: N_USE_TRANSPORT_MODE not encrypted",
__func__);
return (-1);
}
if (left != 0) {
log_debug("%s: ignoring malformed transport mode"
" notification: %zu", __func__, left);
return (0);
}
if (msg->msg_parent->msg_response) {
if (!(msg->msg_policy->pol_flags & IKED_POLICY_TRANSPORT)) {
log_debug("%s: ignoring transport mode"
" notification (policy)", __func__);
return (0);
}
}
msg->msg_parent->msg_flags |= IKED_MSG_FLAGS_USE_TRANSPORT;
break;
case IKEV2_N_UPDATE_SA_ADDRESSES:
if (!msg->msg_e) {
log_debug("%s: N_UPDATE_SA_ADDRESSES not encrypted",
__func__);
return (-1);
}
if (!sa->sa_mobike) {
log_debug("%s: ignoring update sa addresses"
" notification w/o mobike: %zu", __func__, left);
return (0);
}
if (left != 0) {
log_debug("%s: ignoring malformed update sa addresses"
" notification: %zu", __func__, left);
return (0);
}
msg->msg_parent->msg_update_sa_addresses = 1;
break;
case IKEV2_N_COOKIE2:
if (!msg->msg_e) {
log_debug("%s: N_COOKIE2 not encrypted",
__func__);
return (-1);
}
if (!sa->sa_mobike) {
log_debug("%s: ignoring cookie2 notification"
" w/o mobike: %zu", __func__, left);
return (0);
}
if (left < IKED_COOKIE2_MIN || left > IKED_COOKIE2_MAX) {
log_debug("%s: ignoring malformed cookie2"
" notification: %zu", __func__, left);
return (0);
}
ibuf_free(msg->msg_cookie2); /* should not happen */
if ((msg->msg_cookie2 = ibuf_new(buf, left)) == NULL) {
log_debug("%s: failed to get peer cookie2", __func__);
return (-1);
}
msg->msg_parent->msg_cookie2 = msg->msg_cookie2;
break;
case IKEV2_N_COOKIE:
if (msg->msg_e) {
log_debug("%s: N_COOKIE encrypted",
__func__);
return (-1);
}
if (left < IKED_COOKIE_MIN || left > IKED_COOKIE_MAX) {
log_debug("%s: ignoring malformed cookie"
" notification: %zu", __func__, left);
return (0);
}
log_debug("%s: received cookie, len %zu", __func__, left);
print_hex(buf, 0, left);
ibuf_free(msg->msg_cookie);
if ((msg->msg_cookie = ibuf_new(buf, left)) == NULL) {
log_debug("%s: failed to get peer cookie", __func__);
return (-1);
}
msg->msg_parent->msg_cookie = msg->msg_cookie;
break;
case IKEV2_N_FRAGMENTATION_SUPPORTED:
if (msg->msg_e) {
log_debug("%s: N_FRAGMENTATION_SUPPORTED encrypted",
__func__);
return (-1);
}
if (left != 0) {
log_debug("%s: ignoring malformed fragmentation"
" notification: %zu", __func__, left);
return (0);
}
msg->msg_parent->msg_flags |= IKED_MSG_FLAGS_FRAGMENTATION;
break;
case IKEV2_N_SIGNATURE_HASH_ALGORITHMS:
if (msg->msg_e) {
log_debug("%s: SIGNATURE_HASH_ALGORITHMS: encrypted",
__func__);
return (-1);
}
if (sa == NULL) {
log_debug("%s: SIGNATURE_HASH_ALGORITHMS: no SA",
__func__);
return (-1);
}
if (sa->sa_sigsha2) {
log_debug("%s: SIGNATURE_HASH_ALGORITHMS: "
"duplicate notify", __func__);
return (0);
}
if (left < sizeof(signature_hash) ||
left % sizeof(signature_hash)) {
log_debug("%s: malformed signature hash notification"
"(%zu bytes)", __func__, left);
return (0);
}
while (left >= sizeof(signature_hash)) {
memcpy(&signature_hash, buf, sizeof(signature_hash));
signature_hash = betoh16(signature_hash);
log_debug("%s: signature hash %s (%x)", __func__,
print_map(signature_hash, ikev2_sighash_map),
signature_hash);
left -= sizeof(signature_hash);
buf += sizeof(signature_hash);
if (signature_hash == IKEV2_SIGHASH_SHA2_256)
msg->msg_parent->msg_flags
|= IKED_MSG_FLAGS_SIGSHA2;
}
break;
}
return (0);
}
int
ikev2_validate_delete(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_delete *del)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*del)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*del));
return (-1);
}
memcpy(del, msgbuf + offset, sizeof(*del));
if (del->del_protoid == 0) {
log_info("%s: malformed payload: invalid protoid", __func__);
return (-1);
}
return (0);
}
int
ikev2_pld_delete(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct ikev2_delete del;
uint8_t *buf, *msgbuf = ibuf_data(msg->msg_data);
size_t cnt, sz, len;
if (ikev2_validate_delete(msg, offset, left, &del))
return (-1);
/* Skip if it's a response, then we don't have to deal with it */
if (ikev2_msg_frompeer(msg) &&
msg->msg_parent->msg_response)
return (0);
cnt = betoh16(del.del_nspi);
sz = del.del_spisize;
log_debug("%s: proto %s spisize %zu nspi %zu",
__func__, print_map(del.del_protoid, ikev2_saproto_map),
sz, cnt);
if (msg->msg_parent->msg_del_protoid) {
log_debug("%s: duplicate delete payload", __func__);
return (0);
}
msg->msg_parent->msg_del_protoid = del.del_protoid;
msg->msg_parent->msg_del_cnt = cnt;
msg->msg_parent->msg_del_spisize = sz;
buf = msgbuf + offset + sizeof(del);
len = left - sizeof(del);
if (len == 0 || sz == 0 || cnt == 0)
return (0);
if ((len / sz) != cnt) {
log_debug("%s: invalid payload length %zu/%zu != %zu",
__func__, len, sz, cnt);
return (-1);
}
print_hex(buf, 0, len);
msg->msg_parent->msg_del_buf = ibuf_new(buf, len);
return (0);
}
int
ikev2_validate_tss(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_tsp *tsp)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*tsp)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*tsp));
return (-1);
}
memcpy(tsp, msgbuf + offset, sizeof(*tsp));
return (0);
}
int
ikev2_pld_tss(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct ikev2_tsp tsp;
struct ikev2_ts ts;
size_t ts_len, i;
if (ikev2_validate_tss(msg, offset, left, &tsp))
return (-1);
offset += sizeof(tsp);
left -= sizeof(tsp);
log_debug("%s: count %d length %zu", __func__,
tsp.tsp_count, left);
for (i = 0; i < tsp.tsp_count; i++) {
if (ikev2_validate_ts(msg, offset, left, &ts))
return (-1);
log_debug("%s: type %s protoid %u length %d "
"startport %u endport %u", __func__,
print_map(ts.ts_type, ikev2_ts_map),
ts.ts_protoid, betoh16(ts.ts_length),
betoh16(ts.ts_startport),
betoh16(ts.ts_endport));
offset += sizeof(ts);
left -= sizeof(ts);
ts_len = betoh16(ts.ts_length) - sizeof(ts);
if (ikev2_pld_ts(env, pld, msg, offset, ts_len, ts.ts_type))
return (-1);
offset += ts_len;
left -= ts_len;
}
return (0);
}
int
ikev2_validate_ts(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_ts *ts)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
size_t ts_length;
if (left < sizeof(*ts)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*ts));
return (-1);
}
memcpy(ts, msgbuf + offset, sizeof(*ts));
ts_length = betoh16(ts->ts_length);
if (ts_length < sizeof(*ts)) {
log_debug("%s: malformed payload: shorter than minimum header "
"size (%zu < %zu)", __func__, ts_length, sizeof(*ts));
return (-1);
}
if (left < ts_length) {
log_debug("%s: malformed payload: too long for payload size "
"(%zu < %zu)", __func__, left, ts_length);
return (-1);
}
return (0);
}
int
ikev2_pld_ts(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left, unsigned int type)
{
struct sockaddr_in start4, end4;
struct sockaddr_in6 start6, end6;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
uint8_t *ptr;
ptr = msgbuf + offset;
switch (type) {
case IKEV2_TS_IPV4_ADDR_RANGE:
if (left < 2 * 4) {
log_debug("%s: malformed payload: too short "
"for ipv4 addr range (%zu < %u)",
__func__, left, 2 * 4);
return (-1);
}
bzero(&start4, sizeof(start4));
start4.sin_family = AF_INET;
start4.sin_len = sizeof(start4);
memcpy(&start4.sin_addr.s_addr, ptr, 4);
ptr += 4;
left -= 4;
bzero(&end4, sizeof(end4));
end4.sin_family = AF_INET;
end4.sin_len = sizeof(end4);
memcpy(&end4.sin_addr.s_addr, ptr, 4);
left -= 4;
log_debug("%s: start %s end %s", __func__,
print_addr(&start4), print_addr(&end4));
break;
case IKEV2_TS_IPV6_ADDR_RANGE:
if (left < 2 * 16) {
log_debug("%s: malformed payload: too short "
"for ipv6 addr range (%zu < %u)",
__func__, left, 2 * 16);
return (-1);
}
bzero(&start6, sizeof(start6));
start6.sin6_family = AF_INET6;
start6.sin6_len = sizeof(start6);
memcpy(&start6.sin6_addr, ptr, 16);
ptr += 16;
left -= 16;
bzero(&end6, sizeof(end6));
end6.sin6_family = AF_INET6;
end6.sin6_len = sizeof(end6);
memcpy(&end6.sin6_addr, ptr, 16);
left -= 16;
log_debug("%s: start %s end %s", __func__,
print_addr(&start6), print_addr(&end6));
break;
default:
log_debug("%s: ignoring unknown TS type %u", __func__, type);
return (0);
}
if (left > 0) {
log_debug("%s: malformed payload: left (%zu) > 0",
__func__, left);
return (-1);
}
return (0);
}
int
ikev2_pld_ef(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct iked_sa *sa = msg->msg_sa;
struct iked_frag *sa_frag = &sa->sa_fragments;
struct iked_frag_entry *el;
struct ikev2_frag_payload frag;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
uint8_t *buf;
struct ibuf *e = NULL;
size_t frag_num, frag_total;
size_t len;
int ret = -1;
int processed = 0;
ssize_t elen;
buf = msgbuf + offset;
memcpy(&frag, buf, sizeof(frag));
frag_num = betoh16(frag.frag_num);
frag_total = betoh16(frag.frag_total);
offset += sizeof(frag);
buf = msgbuf + offset;
len = left - sizeof(frag);
ikestat_inc(env, ikes_frag_rcvd);
/* Limit number of total fragments to avoid DOS */
if (frag_total > IKED_FRAG_TOTAL_MAX ) {
log_debug("%s: Total Fragments too big %zu",
__func__, frag_total);
goto dropall;
}
/* Check sanity of fragment header */
if (frag_num == 0 || frag_total == 0) {
log_debug("%s: Malformed fragment received: %zu of %zu",
__func__, frag_num, frag_total);
goto done;
}
log_debug("%s: Received fragment: %zu of %zu",
__func__, frag_num, frag_total);
/* Drop fragment if frag_num and frag_total don't match */
if (frag_num > frag_total)
goto done;
/* Decrypt fragment */
if ((e = ibuf_new(buf, len)) == NULL)
goto done;
if ((e = ikev2_msg_decrypt(env, msg->msg_sa, msg->msg_data, e))
== NULL ) {
log_debug("%s: Failed to decrypt fragment: %zu of %zu",
__func__, frag_num, frag_total);
goto done;
}
elen = ibuf_size(e);
/* Check new fragmented message */
if (sa_frag->frag_arr == NULL) {
sa_frag->frag_arr = recallocarray(NULL, 0, frag_total,
sizeof(struct iked_frag_entry*));
if (sa_frag->frag_arr == NULL) {
log_info("%s: recallocarray sa_frag->frag_arr.", __func__);
goto done;
}
sa_frag->frag_total = frag_total;
} else {
/* Drop all fragments if frag_total doesn't match previous */
if (frag_total != sa_frag->frag_total)
goto dropall;
/* Silent drop if fragment already stored */
if (sa_frag->frag_arr[frag_num-1] != NULL)
goto done;
}
/* The first fragments IKE header determines pld_nextpayload */
if (frag_num == 1)
sa_frag->frag_nextpayload = pld->pld_nextpayload;
/* Insert new list element */
el = calloc(1, sizeof(struct iked_frag_entry));
if (el == NULL) {
log_info("%s: Failed allocating new fragment: %zu of %zu",
__func__, frag_num, frag_total);
goto done;
}
sa_frag->frag_arr[frag_num-1] = el;
el->frag_size = elen;
el->frag_data = calloc(1, elen);
if (el->frag_data == NULL) {
log_debug("%s: Failed allocating new fragment data: %zu of %zu",
__func__, frag_num, frag_total);
goto done;
}
/* Copy plaintext to fragment */
memcpy(el->frag_data, ibuf_seek(e, 0, 0), elen);
sa_frag->frag_total_size += elen;
sa_frag->frag_count++;
/* If all frags are received start reassembly */
if (sa_frag->frag_count == sa_frag->frag_total) {
log_debug("%s: All fragments received: %zu of %zu",
__func__, frag_num, frag_total);
ret = ikev2_frags_reassemble(env, pld, msg);
} else {
ret = 0;
}
processed = 1;
done:
if (!processed)
ikestat_inc(env, ikes_frag_rcvd_drop);
ibuf_free(e);
return (ret);
dropall:
ikestat_add(env, ikes_frag_rcvd_drop, sa_frag->frag_count + 1);
config_free_fragments(sa_frag);
ibuf_free(e);
return -1;
}
int
ikev2_frags_reassemble(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg)
{
struct iked_frag *sa_frag = &msg->msg_sa->sa_fragments;
struct ibuf *e = NULL;
struct iked_frag_entry *el;
uint8_t *ptr;
size_t offset;
size_t i;
struct iked_message emsg;
int ret = -1;
int processed = 0;
/* Reassemble fragments to single buffer */
if ((e = ibuf_new(NULL, sa_frag->frag_total_size)) == NULL) {
log_debug("%s: Failed allocating SK buffer.", __func__);
goto done;
}
/* Empty queue to new buffer */
offset = 0;
for (i = 0; i < sa_frag->frag_total; i++) {
if ((el = sa_frag->frag_arr[i]) == NULL)
fatalx("Tried to reassemble shallow frag_arr");
ptr = ibuf_seek(e, offset, el->frag_size);
if (ptr == NULL) {
log_info("%s: failed to reassemble fragments", __func__);
goto done;
}
memcpy(ptr, el->frag_data, el->frag_size);
offset += el->frag_size;
}
log_debug("%s: Defragmented length %zd", __func__,
sa_frag->frag_total_size);
print_hex(ibuf_data(e), 0, sa_frag->frag_total_size);
/* Drop the original request's packets from the retransmit queue */
if (msg->msg_response)
ikev2_msg_dispose(env, &msg->msg_sa->sa_requests,
ikev2_msg_lookup(env, &msg->msg_sa->sa_requests, msg,
msg->msg_exchange));
/*
* Parse decrypted payload
*/
bzero(&emsg, sizeof(emsg));
memcpy(&emsg, msg, sizeof(*msg));
emsg.msg_data = e;
emsg.msg_e = 1;
emsg.msg_parent = msg;
TAILQ_INIT(&emsg.msg_proposals);
ret = ikev2_pld_payloads(env, &emsg, 0, ibuf_size(e),
sa_frag->frag_nextpayload);
processed = 1;
done:
if (processed)
ikestat_add(env, ikes_frag_reass_ok, sa_frag->frag_total);
else
ikestat_add(env, ikes_frag_reass_drop, sa_frag->frag_total);
config_free_fragments(sa_frag);
ibuf_free(e);
return (ret);
}
int
ikev2_pld_e(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct iked_sa *sa = msg->msg_sa;
struct ibuf *e = NULL;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
struct iked_message emsg;
uint8_t *buf;
size_t len;
int ret = -1;
if (sa->sa_fragments.frag_arr != NULL) {
log_warn("%s: Received SK payload when SKFs are in queue.",
__func__);
config_free_fragments(&sa->sa_fragments);
return (ret);
}
buf = msgbuf + offset;
len = left;
if ((e = ibuf_new(buf, len)) == NULL)
goto done;
if (ikev2_msg_frompeer(msg)) {
e = ikev2_msg_decrypt(env, msg->msg_sa, msg->msg_data, e);
} else {
sa->sa_hdr.sh_initiator = sa->sa_hdr.sh_initiator ? 0 : 1;
e = ikev2_msg_decrypt(env, msg->msg_sa, msg->msg_data, e);
sa->sa_hdr.sh_initiator = sa->sa_hdr.sh_initiator ? 0 : 1;
}
if (e == NULL)
goto done;
/*
* Parse decrypted payload
*/
bzero(&emsg, sizeof(emsg));
memcpy(&emsg, msg, sizeof(*msg));
emsg.msg_data = e;
emsg.msg_e = 1;
emsg.msg_parent = msg;
TAILQ_INIT(&emsg.msg_proposals);
ret = ikev2_pld_payloads(env, &emsg, 0, ibuf_size(e),
pld->pld_nextpayload);
done:
ibuf_free(e);
return (ret);
}
int
ikev2_validate_cp(struct iked_message *msg, size_t offset, size_t left,
struct ikev2_cp *cp)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*cp)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*cp));
return (-1);
}
memcpy(cp, msgbuf + offset, sizeof(*cp));
return (0);
}
int
ikev2_pld_cp(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct ikev2_cp cp;
struct ikev2_cfg *cfg;
struct iked_addr *addr;
struct sockaddr_in *in4;
struct sockaddr_in6 *in6;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
uint8_t *ptr;
size_t len;
int cfg_type;
if (ikev2_validate_cp(msg, offset, left, &cp))
return (-1);
ptr = msgbuf + offset + sizeof(cp);
len = left - sizeof(cp);
log_debug("%s: type %s length %zu",
__func__, print_map(cp.cp_type, ikev2_cp_map), len);
print_hex(ptr, 0, len);
while (len > 0) {
if (len < sizeof(*cfg)) {
log_debug("%s: malformed payload: too short for cfg "
"(%zu < %zu)", __func__, len, sizeof(*cfg));
return (-1);
}
cfg = (struct ikev2_cfg *)ptr;
log_debug("%s: %s 0x%04x length %d", __func__,
print_map(betoh16(cfg->cfg_type), ikev2_cfg_map),
betoh16(cfg->cfg_type),
betoh16(cfg->cfg_length));
ptr += sizeof(*cfg);
len -= sizeof(*cfg);
if (len < betoh16(cfg->cfg_length)) {
log_debug("%s: malformed payload: too short for "
"cfg_length (%zu < %u)", __func__, len,
betoh16(cfg->cfg_length));
return (-1);
}
print_hex(ptr, sizeof(*cfg), betoh16(cfg->cfg_length));
cfg_type = betoh16(cfg->cfg_type);
switch (cfg_type) {
case IKEV2_CFG_INTERNAL_IP4_ADDRESS:
case IKEV2_CFG_INTERNAL_IP4_DNS:
if (!ikev2_msg_frompeer(msg))
break;
if (betoh16(cfg->cfg_length) == 0)
break;
/* XXX multiple-valued */
if (betoh16(cfg->cfg_length) < 4) {
log_debug("%s: malformed payload: too short "
"for ipv4 addr (%u < %u)",
__func__, betoh16(cfg->cfg_length), 4);
return (-1);
}
switch(cfg_type) {
case IKEV2_CFG_INTERNAL_IP4_ADDRESS:
if (msg->msg_parent->msg_cp_addr != NULL) {
log_debug("%s: address already set", __func__);
goto skip;
}
break;
case IKEV2_CFG_INTERNAL_IP4_DNS:
if (msg->msg_parent->msg_cp_dns != NULL) {
log_debug("%s: dns already set", __func__);
goto skip;
}
break;
default:
break;
}
if ((addr = calloc(1, sizeof(*addr))) == NULL) {
log_debug("%s: malloc failed", __func__);
break;
}
addr->addr_af = AF_INET;
in4 = (struct sockaddr_in *)&addr->addr;
in4->sin_family = AF_INET;
in4->sin_len = sizeof(*in4);
memcpy(&in4->sin_addr.s_addr, ptr, 4);
switch(cfg_type) {
case IKEV2_CFG_INTERNAL_IP4_ADDRESS:
msg->msg_parent->msg_cp_addr = addr;
log_debug("%s: IP4_ADDRESS %s", __func__,
print_addr(&addr->addr));
break;
case IKEV2_CFG_INTERNAL_IP4_DNS:
msg->msg_parent->msg_cp_dns = addr;
log_debug("%s: IP4_DNS %s", __func__,
print_addr(&addr->addr));
break;
default:
log_debug("%s: cfg %s", __func__,
print_addr(&addr->addr));
break;
}
break;
case IKEV2_CFG_INTERNAL_IP6_ADDRESS:
case IKEV2_CFG_INTERNAL_IP6_DNS:
if (!ikev2_msg_frompeer(msg))
break;
if (betoh16(cfg->cfg_length) == 0)
break;
/* XXX multiple-valued */
if (betoh16(cfg->cfg_length) < 16) {
log_debug("%s: malformed payload: too short "
"for ipv6 addr w/prefixlen (%u < %u)",
__func__, betoh16(cfg->cfg_length), 16);
return (-1);
}
switch(cfg_type) {
case IKEV2_CFG_INTERNAL_IP6_ADDRESS:
if (msg->msg_parent->msg_cp_addr6 != NULL) {
log_debug("%s: address6 already set", __func__);
goto skip;
}
break;
case IKEV2_CFG_INTERNAL_IP6_DNS:
if (msg->msg_parent->msg_cp_dns != NULL) {
log_debug("%s: dns already set", __func__);
goto skip;
}
break;
}
if ((addr = calloc(1, sizeof(*addr))) == NULL) {
log_debug("%s: malloc failed", __func__);
break;
}
addr->addr_af = AF_INET6;
in6 = (struct sockaddr_in6 *)&addr->addr;
in6->sin6_family = AF_INET6;
in6->sin6_len = sizeof(*in6);
memcpy(&in6->sin6_addr, ptr, 16);
switch(cfg_type) {
case IKEV2_CFG_INTERNAL_IP6_ADDRESS:
msg->msg_parent->msg_cp_addr6 = addr;
log_debug("%s: IP6_ADDRESS %s", __func__,
print_addr(&addr->addr));
break;
case IKEV2_CFG_INTERNAL_IP6_DNS:
msg->msg_parent->msg_cp_dns = addr;
log_debug("%s: IP6_DNS %s", __func__,
print_addr(&addr->addr));
break;
default:
log_debug("%s: cfg %s/%d", __func__,
print_addr(&addr->addr), ptr[16]);
break;
}
break;
}
skip:
ptr += betoh16(cfg->cfg_length);
len -= betoh16(cfg->cfg_length);
}
if (!ikev2_msg_frompeer(msg))
return (0);
msg->msg_parent->msg_cp = cp.cp_type;
return (0);
}
int
ikev2_validate_eap(struct iked_message *msg, size_t offset, size_t left,
struct eap_header *hdr)
{
uint8_t *msgbuf = ibuf_data(msg->msg_data);
if (left < sizeof(*hdr)) {
log_debug("%s: malformed payload: too short for header "
"(%zu < %zu)", __func__, left, sizeof(*hdr));
return (-1);
}
memcpy(hdr, msgbuf + offset, sizeof(*hdr));
return (0);
}
int
ikev2_pld_eap(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, size_t offset, size_t left)
{
struct eap_header hdr;
struct eap_message *eap = NULL;
const struct iked_sa *sa = msg->msg_sa;
size_t eap_len;
if (ikev2_validate_eap(msg, offset, left, &hdr))
return (-1);
eap_len = betoh16(hdr.eap_length);
if (left != eap_len) {
log_info("%s: malformed payload: EAP length does not match"
" payload length (%zu != %zu)", __func__, left, eap_len);
return (-1);
}
if (eap_len < sizeof(*eap)) {
log_info("%s: %s id %d length %d", SPI_SA(sa, __func__),
print_map(hdr.eap_code, eap_code_map),
hdr.eap_id, betoh16(hdr.eap_length));
} else {
/* Now try to get the indicated length */
if ((eap = ibuf_seek(msg->msg_data, offset, eap_len)) == NULL) {
log_debug("%s: invalid EAP length", __func__);
return (-1);
}
log_info("%s: %s id %d length %d EAP-%s", SPI_SA(sa, __func__),
print_map(eap->eap_code, eap_code_map),
eap->eap_id, betoh16(eap->eap_length),
print_map(eap->eap_type, eap_type_map));
if (eap_parse(env, sa, msg, eap, msg->msg_response) == -1)
return (-1);
msg->msg_parent->msg_eap.eam_found = 1;
}
return (0);
}
/* parser for the initial IKE_AUTH payload, does not require msg_sa */
int
ikev2_pld_parse_quick(struct iked *env, struct ike_header *hdr,
struct iked_message *msg, size_t offset)
{
struct ikev2_payload pld;
struct ikev2_frag_payload frag;
uint8_t *msgbuf = ibuf_data(msg->msg_data);
uint8_t *buf;
size_t len, total, left;
size_t length;
unsigned int payload;
log_debug("%s: header ispi %s rspi %s"
" nextpayload %s version 0x%02x exchange %s flags 0x%02x"
" msgid %d length %u response %d", __func__,
print_spi(betoh64(hdr->ike_ispi), 8),
print_spi(betoh64(hdr->ike_rspi), 8),
print_map(hdr->ike_nextpayload, ikev2_payload_map),
hdr->ike_version,
print_map(hdr->ike_exchange, ikev2_exchange_map),
hdr->ike_flags,
betoh32(hdr->ike_msgid),
betoh32(hdr->ike_length),
msg->msg_response);
length = betoh32(hdr->ike_length);
if (ibuf_size(msg->msg_data) < length) {
log_debug("%s: short message", __func__);
return (-1);
}
offset += sizeof(*hdr);
/* Bytes left in datagram. */
total = length - offset;
payload = hdr->ike_nextpayload;
while (payload != 0 && offset < length) {
if (ikev2_validate_pld(msg, offset, total, &pld))
return (-1);
log_debug("%s: %spayload %s"
" nextpayload %s critical 0x%02x length %d",
__func__, msg->msg_e ? "decrypted " : "",
print_map(payload, ikev2_payload_map),
print_map(pld.pld_nextpayload, ikev2_payload_map),
pld.pld_reserved & IKEV2_CRITICAL_PAYLOAD,
betoh16(pld.pld_length));
/* Skip over generic payload header. */
offset += sizeof(pld);
total -= sizeof(pld);
left = betoh16(pld.pld_length) - sizeof(pld);
switch (payload) {
case IKEV2_PAYLOAD_SKF:
len = left;
buf = msgbuf + offset;
if (len < sizeof(frag))
return (-1);
memcpy(&frag, buf, sizeof(frag));
msg->msg_frag_num = betoh16(frag.frag_num);
break;
}
payload = pld.pld_nextpayload;
offset += left;
total -= left;
}
return (0);
}
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