/* Release a reference to SA. */
void
sa_release(struct sa *sa)
{
struct cert_handler *handler;
struct proto *proto;
LOG_DBG((LOG_SA, 80, "sa_release: SA %p had %d references",
sa, sa->refcnt));
if (--sa->refcnt)
return;
LOG_DBG((LOG_SA, 60, "sa_release: freeing SA %p", sa));
while ((proto = TAILQ_FIRST(&sa->protos)) != 0)
proto_free(proto);
if (sa->data) {
if (sa->doi && sa->doi->free_sa_data)
sa->doi->free_sa_data(sa->data);
free(sa->data);
}
free(sa->id_i);
free(sa->id_r);
if (sa->recv_cert) {
handler = cert_get(sa->recv_certtype);
if (handler)
handler->cert_free(sa->recv_cert);
}
if (sa->sent_cert) {
handler = cert_get(sa->sent_certtype);
if (handler)
handler->cert_free(sa->sent_cert);
}
if (sa->recv_key)
key_free(sa->recv_keytype, ISAKMP_KEYTYPE_PUBLIC,
sa->recv_key);
free(sa->keynote_key); /* This is just a string */
if (sa->policy_id != -1)
kn_close(sa->policy_id);
free(sa->name);
free(sa->keystate);
if (sa->nat_t_keepalive)
timer_remove_event(sa->nat_t_keepalive);
if (sa->dpd_event)
timer_remove_event(sa->dpd_event);
if (sa->transport)
transport_release(sa->transport);
free(sa->tag);
free(sa);
}
/*
* Decode the certificate request of type TYPE contained in DATA extending
* DATALEN bytes. Return a certreq_aca structure which the caller is
* responsible for deallocating.
*/
struct certreq_aca *
certreq_decode(u_int16_t type, u_int8_t *data, u_int32_t datalen)
{
struct cert_handler *handler;
struct certreq_aca aca, *ret;
handler = cert_get(type);
if (!handler)
return 0;
aca.id = type;
aca.handler = handler;
aca.data = aca.raw_ca = NULL;
if (datalen > 0) {
int rc;
rc = handler->certreq_decode(&aca.data, data, datalen);
if (!rc)
return 0;
aca.raw_ca = malloc(datalen);
if (aca.raw_ca == NULL) {
log_error("certreq_decode: malloc (%lu) failed",
(unsigned long)datalen);
handler->free_aca(aca.data);
return 0;
}
memcpy(aca.raw_ca, data, datalen);
}
aca.raw_ca_len = datalen;
ret = malloc(sizeof aca);
if (!ret) {
log_error("certreq_decode: malloc (%lu) failed",
(unsigned long)sizeof aca);
free(aca.raw_ca);
handler->free_aca(aca.data);
return 0;
}
memcpy(ret, &aca, sizeof aca);
return ret;
}
/* Encrypt the HASH into a SIG type. */
static int
rsa_sig_encode_hash (struct message *msg)
{
struct exchange *exchange = msg->exchange;
struct ipsec_exch *ie = exchange->data;
size_t hashsize = ie->hash->hashsize;
struct cert_handler *handler;
char header[80];
int initiator = exchange->initiator;
u_int8_t *buf, *data, *buf2;
u_int32_t datalen;
u_int8_t *id;
size_t id_len;
int idtype;
void *sent_key;
id = initiator ? exchange->id_i : exchange->id_r;
id_len = initiator ? exchange->id_i_len : exchange->id_r_len;
/* We may have been provided these by the kernel */
buf = (u_int8_t *)conf_get_str (exchange->name, "Credentials");
if (buf
&& (idtype = conf_get_num (exchange->name, "Credential_Type", -1) != -1))
{
exchange->sent_certtype = idtype;
handler = cert_get (idtype);
if (!handler)
{
log_print ("rsa_sig_encode_hash: cert_get (%d) failed", idtype);
return -1;
}
exchange->sent_cert = handler->cert_from_printable ((char *)buf);
if (!exchange->sent_cert)
{
log_print ("rsa_sig_encode_hash: failed to retrieve certificate");
return -1;
}
handler->cert_serialize (exchange->sent_cert, &data, &datalen);
if (!data)
{
log_print ("rsa_sig_encode_hash: cert serialization failed");
return -1;
}
goto aftercert; /* Skip all the certificate discovery */
}
/* XXX This needs to be configurable. */
idtype = ISAKMP_CERTENC_KEYNOTE;
/* Find a certificate with subjectAltName = id. */
handler = cert_get (idtype);
if (!handler)
{
idtype = ISAKMP_CERTENC_X509_SIG;
handler = cert_get (idtype);
if (!handler)
{
log_print ("rsa_sig_encode_hash: cert_get(%d) failed", idtype);
return -1;
}
}
if (handler->cert_obtain (id, id_len, 0, &data, &datalen) == 0)
{
if (idtype == ISAKMP_CERTENC_KEYNOTE)
{
idtype = ISAKMP_CERTENC_X509_SIG;
handler = cert_get (idtype);
if (!handler)
{
log_print ("rsa_sig_encode_hash: cert_get(%d) failed", idtype);
return -1;
}
if (handler->cert_obtain (id, id_len, 0, &data, &datalen) == 0)
{
LOG_DBG ((LOG_MISC, 10,
"rsa_sig_encode_hash: no certificate to send"));
goto skipcert;
}
}
else
{
LOG_DBG ((LOG_MISC, 10,
"rsa_sig_encode_hash: no certificate to send"));
goto skipcert;
}
}
/* Let's store the certificate we are going to use */
exchange->sent_certtype = idtype;
exchange->sent_cert = handler->cert_get (data, datalen);
if (!exchange->sent_cert)
{
free (data);
log_print ("rsa_sig_encode_hash: failed to get certificate from wire "
"encoding");
return -1;
}
aftercert:
buf = realloc (data, ISAKMP_CERT_SZ + datalen);
if (!buf)
{
log_error ("rsa_sig_encode_hash: realloc (%p, %d) failed", data,
ISAKMP_CERT_SZ + datalen);
free (data);
return -1;
}
memmove (buf + ISAKMP_CERT_SZ, buf, datalen);
SET_ISAKMP_CERT_ENCODING (buf, idtype);
if (message_add_payload (msg, ISAKMP_PAYLOAD_CERT, buf,
ISAKMP_CERT_SZ + datalen, 1))
{
free (buf);
return -1;
}
skipcert:
/* Again, we may have these from the kernel */
buf = (u_int8_t *)conf_get_str (exchange->name, "PKAuthentication");
if (buf)
{
key_from_printable (ISAKMP_KEY_RSA, ISAKMP_KEYTYPE_PRIVATE, (char *)buf,
&data, &datalen);
if (!data || datalen == -1)
{
log_print ("rsa_sig_encode_hash: badly formatted RSA private key");
return 0;
}
sent_key = key_internalize (ISAKMP_KEY_RSA, ISAKMP_KEYTYPE_PRIVATE, data,
datalen);
if (!sent_key)
{
log_print ("rsa_sig_encode_hash: bad RSA private key from dynamic "
"SA acquisition subsystem");
return 0;
}
#if defined (USE_PRIVSEP)
{
/* With USE_PRIVSEP, the sent_key should be a key number. */
void *key = sent_key;
sent_key = monitor_RSA_upload_key (key);
}
#endif
}
else /* Try through the regular means. */
{
switch (id[ISAKMP_ID_TYPE_OFF - ISAKMP_GEN_SZ])
{
case IPSEC_ID_IPV4_ADDR:
case IPSEC_ID_IPV6_ADDR:
util_ntoa ((char **)&buf2,
id[ISAKMP_ID_TYPE_OFF - ISAKMP_GEN_SZ] == IPSEC_ID_IPV4_ADDR
? AF_INET : AF_INET6,
id + ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ);
if (!buf2)
return 0;
break;
case IPSEC_ID_FQDN:
case IPSEC_ID_USER_FQDN:
buf2 = calloc (id_len - ISAKMP_ID_DATA_OFF + ISAKMP_GEN_SZ + 1,
sizeof (char));
if (!buf2)
{
log_print ("rsa_sig_encode_hash: malloc (%lu) failed",
(unsigned long)id_len - ISAKMP_ID_DATA_OFF + ISAKMP_GEN_SZ + 1);
return 0;
}
memcpy (buf2, id + ISAKMP_ID_DATA_OFF - ISAKMP_GEN_SZ,
id_len - ISAKMP_ID_DATA_OFF + ISAKMP_GEN_SZ);
break;
/* XXX Support more ID types? */
default:
buf2 = 0;
return 0;
}
#if defined (USE_PRIVSEP)
sent_key = monitor_RSA_get_private_key (exchange->name, (char *)buf2);
#else
sent_key = ike_auth_get_key (IKE_AUTH_RSA_SIG, exchange->name,
(char *)buf2, 0);
#endif
free (buf2);
/* Did we find a key? */
if (!sent_key)
{
log_print ("rsa_sig_encode_hash: could not get private key");
return -1;
}
}
#if !defined (USE_PRIVSEP)
/* Enable RSA blinding. */
if (RSA_blinding_on (sent_key, NULL) != 1)
{
log_error ("rsa_sig_encode_hash: RSA_blinding_on () failed.");
return -1;
}
#endif
/* XXX hashsize is not necessarily prf->blocksize. */
buf = malloc (hashsize);
if (!buf)
{
log_error ("rsa_sig_encode_hash: malloc (%lu) failed",
(unsigned long)hashsize);
return -1;
}
if (ike_auth_hash (exchange, buf) == -1)
{
free (buf);
return -1;
}
snprintf (header, sizeof header, "rsa_sig_encode_hash: HASH_%c",
initiator ? 'I' : 'R');
LOG_DBG_BUF ((LOG_MISC, 80, header, buf, hashsize));
#if !defined (USE_PRIVSEP)
data = malloc (RSA_size (sent_key));
if (!data)
{
log_error ("rsa_sig_encode_hash: malloc (%d) failed",
RSA_size (sent_key));
return -1;
}
datalen = RSA_private_encrypt (hashsize, buf, data, sent_key,
RSA_PKCS1_PADDING);
#else
datalen = monitor_RSA_private_encrypt (hashsize, buf, &data, sent_key,
RSA_PKCS1_PADDING);
#endif /* USE_PRIVSEP */
if (datalen == -1)
{
log_print ("rsa_sig_encode_hash: RSA_private_encrypt () failed");
if (data)
free (data);
free (buf);
monitor_RSA_free (sent_key);
return -1;
}
free (buf);
buf = realloc (data, ISAKMP_SIG_SZ + datalen);
if (!buf)
{
log_error ("rsa_sig_encode_hash: realloc (%p, %d) failed", data,
ISAKMP_SIG_SZ + datalen);
free (data);
return -1;
}
memmove (buf + ISAKMP_SIG_SZ, buf, datalen);
snprintf (header, sizeof header, "rsa_sig_encode_hash: SIG_%c",
initiator ? 'I' : 'R');
LOG_DBG_BUF ((LOG_MISC, 80, header, buf + ISAKMP_SIG_DATA_OFF, datalen));
if (message_add_payload (msg, ISAKMP_PAYLOAD_SIG, buf,
ISAKMP_SIG_SZ + datalen, 1))
{
free (buf);
return -1;
}
return 0;
}
/* Decrypt the HASH in SIG, we already need a parsed ID payload. */
static int
rsa_sig_decode_hash (struct message *msg)
{
struct cert_handler *handler;
struct exchange *exchange = msg->exchange;
struct ipsec_exch *ie = exchange->data;
struct payload *p;
void *cert = 0;
u_int8_t *rawcert = 0;
u_int32_t rawcertlen;
RSA *key = 0;
size_t hashsize = ie->hash->hashsize;
char header[80];
int len;
int initiator = exchange->initiator;
u_int8_t **hash_p, **id_cert, *id;
u_int32_t *id_cert_len;
size_t id_len;
int found = 0, n, i, id_found;
#if defined (USE_DNSSEC)
u_int8_t *rawkey = 0;
u_int32_t rawkeylen;
#endif
/* Choose the right fields to fill-in. */
hash_p = initiator ? &ie->hash_r : &ie->hash_i;
id = initiator ? exchange->id_r : exchange->id_i;
id_len = initiator ? exchange->id_r_len : exchange->id_i_len;
if (!id || id_len == 0)
{
log_print ("rsa_sig_decode_hash: ID is missing");
return -1;
}
/*
* XXX Assume we should use the same kind of certification as the remote...
* moreover, just use the first CERT payload to decide what to use.
*/
p = TAILQ_FIRST (&msg->payload[ISAKMP_PAYLOAD_CERT]);
if (!p)
handler = cert_get (ISAKMP_CERTENC_KEYNOTE);
else
handler = cert_get (GET_ISAKMP_CERT_ENCODING (p->p));
if (!handler)
{
log_print ("rsa_sig_decode_hash: cert_get (%d) failed",
p ? GET_ISAKMP_CERT_ENCODING (p->p) : -1);
return -1;
}
#if defined (USE_POLICY) && defined (USE_KEYNOTE)
/*
* We need the policy session initialized now, so we can add
* credentials etc.
*/
exchange->policy_id = kn_init ();
if (exchange->policy_id == -1)
{
log_print ("rsa_sig_decode_hash: failed to initialize policy session");
return -1;
}
#endif /* USE_POLICY || USE_KEYNOTE */
/* Obtain a certificate from our certificate storage. */
if (handler->cert_obtain (id, id_len, 0, &rawcert, &rawcertlen))
{
if (handler->id == ISAKMP_CERTENC_X509_SIG)
{
cert = handler->cert_get (rawcert, rawcertlen);
if (!cert)
LOG_DBG ((LOG_CRYPTO, 50,
"rsa_sig_decode_hash: certificate malformed"));
else
{
if (!handler->cert_get_key (cert, &key))
{
log_print ("rsa_sig_decode_hash: "
"decoding certificate failed");
handler->cert_free (cert);
}
else
{
found++;
LOG_DBG ((LOG_CRYPTO, 40,
"rsa_sig_decode_hash: using cert of type %d",
handler->id));
exchange->recv_cert = cert;
exchange->recv_certtype = handler->id;
#if defined (USE_POLICY)
x509_generate_kn (exchange->policy_id, cert);
#endif /* USE_POLICY */
}
}
}
else if (handler->id == ISAKMP_CERTENC_KEYNOTE)
handler->cert_insert (exchange->policy_id, rawcert);
free (rawcert);
}
/*
* Walk over potential CERT payloads in this message.
* XXX I believe this is the wrong spot for this. CERTs can appear
* anytime.
*/
for (p = TAILQ_FIRST (&msg->payload[ISAKMP_PAYLOAD_CERT]); p;
p = TAILQ_NEXT (p, link))
{
p->flags |= PL_MARK;
/* When we have found a key, just walk over the rest, marking them. */
if (found)
continue;
handler = cert_get (GET_ISAKMP_CERT_ENCODING (p->p));
if (!handler)
{
LOG_DBG ((LOG_MISC, 30,
"rsa_sig_decode_hash: no handler for %s CERT encoding",
constant_name (isakmp_certenc_cst,
GET_ISAKMP_CERT_ENCODING (p->p))));
continue;
}
cert = handler->cert_get (p->p + ISAKMP_CERT_DATA_OFF,
GET_ISAKMP_GEN_LENGTH (p->p)
- ISAKMP_CERT_DATA_OFF);
if (!cert)
{
log_print ("rsa_sig_decode_hash: can not get data from CERT");
continue;
}
if (!handler->cert_validate (cert))
{
handler->cert_free (cert);
log_print ("rsa_sig_decode_hash: received CERT can't be validated");
continue;
}
if (GET_ISAKMP_CERT_ENCODING (p->p) == ISAKMP_CERTENC_X509_SIG)
{
if (!handler->cert_get_subjects (cert, &n, &id_cert, &id_cert_len))
{
handler->cert_free (cert);
log_print ("rsa_sig_decode_hash: can not get subject from CERT");
continue;
}
id_found = 0;
for (i = 0; i < n; i++)
if (id_cert_len[i] == id_len
&& id[0] == id_cert[i][0]
&& memcmp (id + 4, id_cert[i] + 4, id_len - 4) == 0)
{
id_found++;
break;
}
if (!id_found)
{
handler->cert_free (cert);
log_print ("rsa_sig_decode_hash: no CERT subject match the ID");
free (id_cert);
continue;
}
cert_free_subjects (n, id_cert, id_cert_len);
}
if (!handler->cert_get_key (cert, &key))
{
handler->cert_free (cert);
log_print ("rsa_sig_decode_hash: decoding payload CERT failed");
continue;
}
/* We validated the cert, cache it for later use. */
handler->cert_insert (exchange->policy_id, cert);
exchange->recv_cert = cert;
exchange->recv_certtype = GET_ISAKMP_CERT_ENCODING (p->p);
#if defined (USE_POLICY) && defined (USE_KEYNOTE)
if (exchange->recv_certtype == ISAKMP_CERTENC_KEYNOTE)
{
struct keynote_deckey dc;
char *pp;
int dclen;
dc.dec_algorithm = KEYNOTE_ALGORITHM_RSA;
dc.dec_key = key;
pp = kn_encode_key (&dc, INTERNAL_ENC_PKCS1, ENCODING_HEX,
KEYNOTE_PUBLIC_KEY);
if (pp == NULL)
{
kn_free_key (&dc);
log_print ("rsa_sig_decode_hash: failed to ASCII-encode key");
return -1;
}
dclen = strlen (pp) + sizeof "rsa-hex:";
exchange->keynote_key = calloc (dclen, sizeof (char));
if (!exchange->keynote_key)
{
free (pp);
kn_free_key (&dc);
log_print ("rsa_sig_decode_hash: failed to allocate %d bytes",
dclen);
return -1;
}
snprintf (exchange->keynote_key, dclen, "rsa-hex:%s", pp);
free (pp);
}
#endif
found++;
}
#if defined (USE_DNSSEC)
/* If no certificate provided a key, try to find a validated DNSSEC KEY. */
if (!found)
{
rawkey = dns_get_key (IKE_AUTH_RSA_SIG, msg, &rawkeylen);
/* We need to convert 'void *rawkey' into 'RSA *key'. */
if (dns_RSA_dns_to_x509 (rawkey, rawkeylen, &key) == 0)
found++;
else
log_print ("rsa_sig_decode_hash: KEY to RSA key conversion failed");
if (rawkey)
free (rawkey);
}
#endif /* USE_DNSSEC */
#if defined (USE_RAWKEY)
/* If we still have not found a key, try to read it from a file. */
if (!found)
if (get_raw_key_from_file (IKE_AUTH_RSA_SIG, id, id_len, &key) != -1)
found++;
#endif
if (!found)
{
log_print ("rsa_sig_decode_hash: no public key found");
return -1;
}
p = TAILQ_FIRST (&msg->payload[ISAKMP_PAYLOAD_SIG]);
if (!p)
{
log_print ("rsa_sig_decode_hash: missing signature payload");
RSA_free (key);
return -1;
}
/* Check that the sig is of the correct size. */
len = GET_ISAKMP_GEN_LENGTH (p->p) - ISAKMP_SIG_SZ;
if (len != RSA_size (key))
{
RSA_free (key);
log_print ("rsa_sig_decode_hash: "
"SIG payload length does not match public key");
return -1;
}
*hash_p = malloc (len);
if (!*hash_p)
{
RSA_free (key);
log_error ("rsa_sig_decode_hash: malloc (%d) failed", len);
return -1;
}
len = RSA_public_decrypt (len, p->p + ISAKMP_SIG_DATA_OFF, *hash_p, key,
RSA_PKCS1_PADDING);
if (len == -1)
{
RSA_free (key);
log_print ("rsa_sig_decode_hash: RSA_public_decrypt () failed");
return -1;
}
/* Store key for later use */
exchange->recv_key = key;
exchange->recv_keytype = ISAKMP_KEY_RSA;
if (len != hashsize)
{
free (*hash_p);
*hash_p = 0;
log_print ("rsa_sig_decode_hash: len %lu != hashsize %lu",
(unsigned long)len, (unsigned long)hashsize);
return -1;
}
snprintf (header, sizeof header, "rsa_sig_decode_hash: HASH_%c",
initiator ? 'R' : 'I');
LOG_DBG_BUF ((LOG_MISC, 80, header, *hash_p, hashsize));
p->flags |= PL_MARK;
return 0;
}
