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;
u_int8_t *buf;
size_t len;
struct iked_sa *sa = msg->msg_sa;
u_int8_t *msgbuf = ibuf_data(msg->msg_data);
if (ikev2_validate_auth(msg, offset, left, pld, &auth))
return (-1);
offset += sizeof(auth);
buf = msgbuf + offset;
len = betoh16(pld->pld_length) - sizeof(*pld) - 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);
/* The AUTH payload indicates if the responder wants EAP or not */
if (!sa_stateok(sa, IKEV2_STATE_EAP))
sa_state(env, sa, IKEV2_STATE_AUTH_REQUEST);
idp = &msg->msg_parent->msg_auth;
if (idp->id_type) {
log_debug("%s: duplicate auth payload", __func__);
return (-1);
}
ibuf_release(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
eap_mschap(struct iked *env, struct iked_sa *sa, struct eap_message *eap)
{
struct iked_user *usr;
struct eap_message *resp;
struct eap_mschap_response *msr;
struct eap_mschap_peer *msp;
struct eap_mschap *ms;
struct eap_mschap_success *mss;
u_int8_t *ptr, *pass;
size_t len, passlen;
char *name, *msg;
u_int8_t ntresponse[EAP_MSCHAP_NTRESPONSE_SZ];
u_int8_t successmsg[EAP_MSCHAP_SUCCESS_SZ];
struct ibuf *eapmsg = NULL;
int ret = -1;
if (!sa_stateok(sa, IKEV2_STATE_EAP)) {
log_debug("%s: unexpected EAP", __func__);
return (0); /* ignore */
}
if (sa->sa_hdr.sh_initiator) {
log_debug("%s: initiator EAP not supported", __func__);
return (-1);
}
/* Only MSCHAP-V2 */
if (eap->eap_type != EAP_TYPE_MSCHAP_V2) {
log_debug("%s: unsupported type EAP-%s", __func__,
print_map(eap->eap_type, eap_type_map));
return (-1);
}
if (betoh16(eap->eap_length) < (sizeof(*eap) + sizeof(*ms))) {
log_debug("%s: short message", __func__);
return (-1);
}
ms = (struct eap_mschap *)(eap + 1);
ptr = (u_int8_t *)(eap + 1);
switch (ms->ms_opcode) {
case EAP_MSOPCODE_RESPONSE:
msr = (struct eap_mschap_response *)ms;
if (betoh16(eap->eap_length) < (sizeof(*eap) + sizeof(*msr))) {
log_debug("%s: short response", __func__);
return (-1);
}
ptr += sizeof(*msr);
len = betoh16(eap->eap_length) -
sizeof(*eap) - sizeof(*msr);
if (len == 0 && sa->sa_eapid != NULL)
name = strdup(sa->sa_eapid);
else
name = get_string(ptr, len);
if (name == NULL) {
log_debug("%s: invalid response name", __func__);
return (-1);
}
if ((usr = user_lookup(env, name)) == NULL) {
log_debug("%s: unknown user '%s'", __func__, name);
free(name);
return (-1);
}
free(name);
if ((pass = string2unicode(usr->usr_pass, &passlen)) == NULL)
return (-1);
msp = &msr->msr_response.resp_peer;
mschap_nt_response(ibuf_data(sa->sa_eap.id_buf),
msp->msp_challenge, usr->usr_name, strlen(usr->usr_name),
pass, passlen, ntresponse);
if (memcmp(ntresponse, msp->msp_ntresponse,
sizeof(ntresponse)) != 0) {
log_debug("%s: '%s' authentication failed", __func__,
usr->usr_name);
free(pass);
/* XXX should we send an EAP failure packet? */
return (-1);
}
bzero(&successmsg, sizeof(successmsg));
mschap_auth_response(pass, passlen,
ntresponse, ibuf_data(sa->sa_eap.id_buf),
msp->msp_challenge, usr->usr_name, strlen(usr->usr_name),
successmsg);
if ((sa->sa_eapmsk = ibuf_new(NULL, MSCHAP_MSK_SZ)) == NULL) {
log_debug("%s: failed to get MSK", __func__);
free(pass);
return (-1);
}
mschap_msk(pass, passlen, ntresponse,
ibuf_data(sa->sa_eapmsk));
free(pass);
log_info("%s: '%s' authenticated", __func__, usr->usr_name);
if ((eapmsg = ibuf_static()) == NULL)
return (-1);
msg = " M=Welcome";
if ((resp = ibuf_advance(eapmsg, sizeof(*resp))) == NULL)
goto done;
resp->eap_code = EAP_CODE_REQUEST;
resp->eap_id = eap->eap_id + 1;
resp->eap_length = htobe16(sizeof(*resp) + sizeof(*mss) +
sizeof(successmsg) + strlen(msg));
resp->eap_type = EAP_TYPE_MSCHAP_V2;
if ((mss = ibuf_advance(eapmsg, sizeof(*mss))) == NULL)
goto done;
mss->mss_opcode = EAP_MSOPCODE_SUCCESS;
mss->mss_id = msr->msr_id;
mss->mss_length = htobe16(sizeof(*mss) +
sizeof(successmsg) + strlen(msg));
if (ibuf_add(eapmsg, successmsg, sizeof(successmsg)) != 0)
goto done;
if (ibuf_add(eapmsg, msg, strlen(msg)) != 0)
goto done;
break;
case EAP_MSOPCODE_SUCCESS:
if ((eapmsg = ibuf_static()) == NULL)
return (-1);
if ((resp = ibuf_advance(eapmsg, sizeof(*resp))) == NULL)
goto done;
resp->eap_code = EAP_CODE_RESPONSE;
resp->eap_id = eap->eap_id;
resp->eap_length = htobe16(sizeof(*resp) + sizeof(*ms));
resp->eap_type = EAP_TYPE_MSCHAP_V2;
if ((ms = ibuf_advance(eapmsg, sizeof(*ms))) == NULL)
goto done;
ms->ms_opcode = EAP_MSOPCODE_SUCCESS;
break;
case EAP_MSOPCODE_FAILURE:
case EAP_MSOPCODE_CHANGE_PASSWORD:
case EAP_MSOPCODE_CHALLENGE:
default:
log_debug("%s: EAP-%s unsupported "
"responder operation %s", __func__,
print_map(eap->eap_type, eap_type_map),
print_map(ms->ms_opcode, eap_msopcode_map));
return (-1);
}
if (eapmsg != NULL)
ret = ikev2_send_ike_e(env, sa, eapmsg,
IKEV2_PAYLOAD_EAP, IKEV2_EXCHANGE_IKE_AUTH, 1);
if (ret == 0)
sa_state(env, sa, IKEV2_STATE_AUTH_SUCCESS);
done:
ibuf_release(eapmsg);
return (ret);
}
int
ikev2_pld_delete(struct iked *env, struct ikev2_payload *pld,
struct iked_message *msg, off_t offset)
{
struct iked_childsa **peersas = NULL;
struct iked_sa *sa = msg->msg_sa;
struct ikev2_delete *del, *localdel;
struct ibuf *resp = NULL;
u_int64_t *localspi = NULL;
u_int64_t spi64, spi = 0;
u_int32_t spi32;
u_int8_t *buf, *msgbuf = ibuf_data(msg->msg_data);
size_t found = 0, failed = 0;
int cnt, i, len, sz, ret = -1;
/* Skip if it's a reply and we don't have to deal with it */
if (ikev2_msg_frompeer(msg) && sa &&
(sa->sa_stateflags & IKED_REQ_INF)) {
sa->sa_stateflags &= ~IKED_REQ_INF;
if ((sa->sa_stateflags & IKED_REQ_DELETE) == 0)
return (0);
}
if ((del = ibuf_seek(msg->msg_data, offset, sizeof(*del))) == NULL)
return (-1);
cnt = betoh16(del->del_nspi);
sz = del->del_spisize;
log_debug("%s: proto %s spisize %d nspi %d",
__func__, print_map(del->del_protoid, ikev2_saproto_map),
sz, cnt);
buf = msgbuf + offset + sizeof(*del);
len = betoh16(pld->pld_length) - sizeof(*pld) - sizeof(*del);
print_hex(buf, 0, len);
switch (sz) {
case 4:
case 8:
break;
default:
if (ikev2_msg_frompeer(msg) &&
del->del_protoid == IKEV2_SAPROTO_IKE) {
/* Send an empty informational response */
if ((resp = ibuf_static()) == NULL)
goto done;
ret = ikev2_send_ike_e(env, sa, resp,
IKEV2_PAYLOAD_NONE,
IKEV2_EXCHANGE_INFORMATIONAL, 1);
ibuf_release(resp);
sa_state(env, sa, IKEV2_STATE_CLOSED);
return (ret);
}
log_debug("%s: invalid SPI size", __func__);
return (-1);
}
if ((len / sz) != cnt) {
log_debug("%s: invalid payload length %d/%d != %d",
__func__, len, sz, cnt);
return (-1);
}
if (ikev2_msg_frompeer(msg) &&
((peersas = calloc(cnt, sizeof(struct iked_childsa *))) == NULL ||
(localspi = calloc(cnt, sizeof(u_int64_t))) == NULL)) {
log_warn("%s", __func__);
goto done;
}
for (i = 0; i < cnt; i++) {
switch (sz) {
case 4:
memcpy(&spi32, buf + (i * sz), sizeof(spi32));
spi = betoh32(spi32);
break;
case 8:
memcpy(&spi64, buf + (i * sz), sizeof(spi64));
spi = betoh64(spi64);
break;
}
log_debug("%s: spi %s", __func__, print_spi(spi, sz));
if (peersas == NULL || sa == NULL)
continue;
if ((peersas[i] = childsa_lookup(sa, spi,
del->del_protoid)) == NULL) {
log_warnx("%s: CHILD SA doesn't exist for spi %s",
__func__, print_spi(spi, del->del_spisize));
goto done;
}
if (ikev2_childsa_delete(env, sa, del->del_protoid, spi,
&localspi[i], 0) == -1)
failed++;
else
found++;
/*
* Flows are left in the require mode so that it would be
* possible to quickly negotiate a new Child SA
*/
}
/* Parsed outgoing message? */
if (!ikev2_msg_frompeer(msg))
goto done;
if (sa && (sa->sa_stateflags & IKED_REQ_DELETE)) {
/* Finish rekeying */
sa->sa_stateflags &= ~IKED_REQ_DELETE;
ret = 0;
goto done;
}
/* Response to the INFORMATIONAL with Delete payload */
if ((resp = ibuf_static()) == NULL)
goto done;
if (found) {
if ((localdel = ibuf_advance(resp, sizeof(*localdel))) == NULL)
goto done;
localdel->del_protoid = del->del_protoid;
localdel->del_spisize = del->del_spisize;
localdel->del_nspi = htobe16(found);
for (i = 0; i < cnt; i++) {
switch (sz) {
case 4:
spi32 = htobe32(localspi[i]);
if (ibuf_add(resp, &spi32, sizeof(spi32)) != 0)
goto done;
break;
case 8:
spi64 = htobe64(localspi[i]);
if (ibuf_add(resp, &spi64, sizeof(spi64)) != 0)
goto done;
break;
}
}
log_warnx("%s: deleted %d spis", __func__, found);
}
if (found) {
ret = ikev2_send_ike_e(env, sa, resp, IKEV2_PAYLOAD_DELETE,
IKEV2_EXCHANGE_INFORMATIONAL, 1);
} else {
/* XXX should we send an INVALID_SPI notification? */
ret = 0;
}
done:
if (localspi)
free(localspi);
if (peersas)
free(peersas);
ibuf_release(resp);
return (ret);
}
int
ikev2_msg_authverify(struct iked *env, struct iked_sa *sa,
struct iked_auth *auth, uint8_t *buf, size_t len, struct ibuf *authmsg)
{
uint8_t *key, *psk = NULL;
ssize_t keylen;
struct iked_id *id;
struct iked_dsa *dsa = NULL;
int ret = -1;
uint8_t keytype;
if (sa->sa_hdr.sh_initiator)
id = &sa->sa_rcert;
else
id = &sa->sa_icert;
if ((dsa = dsa_verify_new(auth->auth_method, sa->sa_prf)) == NULL) {
log_debug("%s: invalid auth method", __func__);
return (-1);
}
switch (auth->auth_method) {
case IKEV2_AUTH_SHARED_KEY_MIC:
if (!auth->auth_length) {
log_debug("%s: no pre-shared key found", __func__);
goto done;
}
if ((keylen = ikev2_psk(sa, auth->auth_data,
auth->auth_length, &psk)) == -1) {
log_debug("%s: failed to get PSK", __func__);
goto done;
}
key = psk;
keytype = 0;
break;
default:
if (!id->id_type || !ibuf_length(id->id_buf)) {
log_debug("%s: no cert found", __func__);
goto done;
}
key = ibuf_data(id->id_buf);
keylen = ibuf_size(id->id_buf);
keytype = id->id_type;
break;
}
log_debug("%s: method %s keylen %zd type %s", __func__,
print_map(auth->auth_method, ikev2_auth_map), keylen,
print_map(id->id_type, ikev2_cert_map));
if (dsa_setkey(dsa, key, keylen, keytype) == NULL ||
dsa_init(dsa, buf, len) != 0 ||
dsa_update(dsa, ibuf_data(authmsg), ibuf_size(authmsg))) {
log_debug("%s: failed to compute digital signature", __func__);
goto done;
}
if ((ret = dsa_verify_final(dsa, buf, len)) == 0) {
log_debug("%s: authentication successful", __func__);
sa_state(env, sa, IKEV2_STATE_AUTH_SUCCESS);
sa_stateflags(sa, IKED_REQ_AUTHVALID);
} else {
log_debug("%s: authentication failed", __func__);
sa_state(env, sa, IKEV2_STATE_AUTH_REQUEST);
}
done:
free(psk);
dsa_free(dsa);
return (ret);
}
