Imported Upstream version 5.0.1

1 files changed, 529 insertions, 0 deletions

diff --git a/src/libcharon/sa/ikev2/tasks/ike_cert_pre.c b/src/libcharon/sa/ikev2/tasks/ike_cert_pre.c
new file mode 100644
index 000000000..60e878777
--- /dev/null
+++ b/src/libcharon/sa/ikev2/tasks/ike_cert_pre.c
@@ -0,0 +1,529 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2006-2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_cert_pre.h"
+
+#include <daemon.h>
+#include <sa/ike_sa.h>
+#include <encoding/payloads/cert_payload.h>
+#include <encoding/payloads/certreq_payload.h>
+#include <credentials/certificates/x509.h>
+
+
+typedef struct private_ike_cert_pre_t private_ike_cert_pre_t;
+
+/**
+ * Private members of a ike_cert_pre_t task.
+ */
+struct private_ike_cert_pre_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_cert_pre_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * Do we accept HTTP certificate lookup requests
+	 */
+	bool do_http_lookup;
+
+	/**
+	 * whether this is the final authentication round
+	 */
+	bool final;
+};
+
+/**
+ * read certificate requests
+ */
+static void process_certreqs(private_ike_cert_pre_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	auth_cfg_t *auth;
+
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		switch (payload->get_type(payload))
+		{
+			case CERTIFICATE_REQUEST:
+			{
+				certreq_payload_t *certreq = (certreq_payload_t*)payload;
+				enumerator_t *enumerator;
+				u_int unknown = 0;
+				chunk_t keyid;
+
+				this->ike_sa->set_condition(this->ike_sa, COND_CERTREQ_SEEN, TRUE);
+
+				if (certreq->get_cert_type(certreq) != CERT_X509)
+				{
+					DBG1(DBG_IKE, "cert payload %N not supported - ignored",
+						 certificate_type_names, certreq->get_cert_type(certreq));
+					break;
+				}
+				enumerator = certreq->create_keyid_enumerator(certreq);
+				while (enumerator->enumerate(enumerator, &keyid))
+				{
+					identification_t *id;
+					certificate_t *cert;
+
+					id = identification_create_from_encoding(ID_KEY_ID, keyid);
+					cert = lib->credmgr->get_cert(lib->credmgr,
+												  CERT_X509, KEY_ANY, id, TRUE);
+					if (cert)
+					{
+						DBG1(DBG_IKE, "received cert request for \"%Y\"",
+							 cert->get_subject(cert));
+						auth->add(auth, AUTH_RULE_CA_CERT, cert);
+					}
+					else
+					{
+						DBG2(DBG_IKE, "received cert request for unknown ca "
+									  "with keyid %Y", id);
+						unknown++;
+					}
+					id->destroy(id);
+				}
+				enumerator->destroy(enumerator);
+				if (unknown)
+				{
+					DBG1(DBG_IKE, "received %u cert requests for an unknown ca",
+						 unknown);
+				}
+				break;
+			}
+			case NOTIFY:
+			{
+				notify_payload_t *notify = (notify_payload_t*)payload;
+
+				/* we only handle one type of notify here */
+				if (notify->get_notify_type(notify) == HTTP_CERT_LOOKUP_SUPPORTED)
+				{
+					this->ike_sa->enable_extension(this->ike_sa, EXT_HASH_AND_URL);
+				}
+				break;
+			}
+			default:
+				/* ignore other payloads here, these are handled elsewhere */
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * tries to extract a certificate from the cert payload or the credential
+ * manager (based on the hash of a "Hash and URL" encoded cert).
+ * Note: the returned certificate (if any) has to be destroyed
+ */
+static certificate_t *try_get_cert(cert_payload_t *cert_payload)
+{
+	certificate_t *cert = NULL;
+
+	switch (cert_payload->get_cert_encoding(cert_payload))
+	{
+		case ENC_X509_SIGNATURE:
+		{
+			cert = cert_payload->get_cert(cert_payload);
+			break;
+		}
+		case ENC_X509_HASH_AND_URL:
+		{
+			identification_t *id;
+			chunk_t hash = cert_payload->get_hash(cert_payload);
+			if (!hash.ptr)
+			{
+				/* invalid "Hash and URL" data (logged elsewhere) */
+				break;
+			}
+			id = identification_create_from_encoding(ID_KEY_ID, hash);
+			cert = lib->credmgr->get_cert(lib->credmgr,
+										  CERT_X509, KEY_ANY, id, FALSE);
+			id->destroy(id);
+			break;
+		}
+		default:
+		{
+			break;
+		}
+	}
+	return cert;
+}
+
+/**
+ * import certificates
+ */
+static void process_certs(private_ike_cert_pre_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	auth_cfg_t *auth;
+	bool first = TRUE;
+
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == CERTIFICATE)
+		{
+			cert_payload_t *cert_payload;
+			cert_encoding_t encoding;
+			certificate_t *cert;
+			char *url;
+
+			cert_payload = (cert_payload_t*)payload;
+			encoding = cert_payload->get_cert_encoding(cert_payload);
+
+			switch (encoding)
+			{
+				case ENC_X509_HASH_AND_URL:
+				{
+					if (!this->do_http_lookup)
+					{
+						DBG1(DBG_IKE, "received hash-and-url encoded cert, but"
+								" we don't accept them, ignore");
+						break;
+					}
+					/* FALL */
+				}
+				case ENC_X509_SIGNATURE:
+				{
+					cert = try_get_cert(cert_payload);
+					if (cert)
+					{
+						if (first)
+						{	/* the first is an end entity certificate */
+							DBG1(DBG_IKE, "received end entity cert \"%Y\"",
+								 cert->get_subject(cert));
+							auth->add(auth, AUTH_HELPER_SUBJECT_CERT, cert);
+							first = FALSE;
+						}
+						else
+						{
+							DBG1(DBG_IKE, "received issuer cert \"%Y\"",
+								 cert->get_subject(cert));
+							auth->add(auth, AUTH_HELPER_IM_CERT, cert);
+						}
+					}
+					else if (encoding == ENC_X509_HASH_AND_URL)
+					{
+						/* we fetch the certificate not yet, but only if
+						 * it is really needed during authentication */
+						url = cert_payload->get_url(cert_payload);
+						if (!url)
+						{
+							DBG1(DBG_IKE, "received invalid hash-and-url "
+								 "encoded cert, ignore");
+							break;
+						}
+						url = strdup(url);
+						if (first)
+						{	/* first URL is for an end entity certificate */
+							DBG1(DBG_IKE, "received hash-and-url for end"
+								 " entity cert \"%s\"", url);
+							auth->add(auth, AUTH_HELPER_SUBJECT_HASH_URL, url);
+							first = FALSE;
+						}
+						else
+						{
+							DBG1(DBG_IKE, "received hash-and-url for issuer"
+									" cert \"%s\"", url);
+							auth->add(auth, AUTH_HELPER_IM_HASH_URL, url);
+						}
+					}
+					break;
+				}
+				case ENC_CRL:
+					cert = cert_payload->get_cert(cert_payload);
+					if (cert)
+					{
+						DBG1(DBG_IKE, "received CRL \"%Y\"",
+							 cert->get_subject(cert));
+						auth->add(auth, AUTH_HELPER_REVOCATION_CERT, cert);
+					}
+					break;
+				case ENC_PKCS7_WRAPPED_X509:
+				case ENC_PGP:
+				case ENC_DNS_SIGNED_KEY:
+				case ENC_KERBEROS_TOKEN:
+				case ENC_ARL:
+				case ENC_SPKI:
+				case ENC_X509_ATTRIBUTE:
+				case ENC_RAW_RSA_KEY:
+				case ENC_X509_HASH_AND_URL_BUNDLE:
+				case ENC_OCSP_CONTENT:
+				default:
+					DBG1(DBG_ENC, "certificate encoding %N not supported",
+						 cert_encoding_names, encoding);
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * add the keyid of a certificate to the certificate request payload
+ */
+static void add_certreq(certreq_payload_t **req, certificate_t *cert)
+{
+	switch (cert->get_type(cert))
+	{
+		case CERT_X509:
+		{
+			public_key_t *public;
+			chunk_t keyid;
+			x509_t *x509 = (x509_t*)cert;
+
+			if (!(x509->get_flags(x509) & X509_CA))
+			{	/* no CA cert, skip */
+				break;
+			}
+			public = cert->get_public_key(cert);
+			if (!public)
+			{
+				break;
+			}
+			if (*req == NULL)
+			{
+				*req = certreq_payload_create_type(CERT_X509);
+			}
+			if (public->get_fingerprint(public, KEYID_PUBKEY_INFO_SHA1, &keyid))
+			{
+				(*req)->add_keyid(*req, keyid);
+				DBG1(DBG_IKE, "sending cert request for \"%Y\"",
+					 cert->get_subject(cert));
+			}
+			public->destroy(public);
+			break;
+		}
+		default:
+			break;
+	}
+}
+
+/**
+ * add a auth_cfg's CA certificates to the certificate request
+ */
+static void add_certreqs(certreq_payload_t **req, auth_cfg_t *auth)
+{
+	enumerator_t *enumerator;
+	auth_rule_t type;
+	void *value;
+
+	enumerator = auth->create_enumerator(auth);
+	while (enumerator->enumerate(enumerator, &type, &value))
+	{
+		switch (type)
+		{
+			case AUTH_RULE_CA_CERT:
+				add_certreq(req, (certificate_t*)value);
+				break;
+			default:
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * build certificate requests
+ */
+static void build_certreqs(private_ike_cert_pre_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	ike_cfg_t *ike_cfg;
+	peer_cfg_t *peer_cfg;
+	certificate_t *cert;
+	auth_cfg_t *auth;
+	certreq_payload_t *req = NULL;
+
+	ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
+	if (!ike_cfg->send_certreq(ike_cfg))
+	{
+		return;
+	}
+
+	/* check if we require a specific CA for that peer */
+	peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+	if (peer_cfg)
+	{
+		enumerator = peer_cfg->create_auth_cfg_enumerator(peer_cfg, FALSE);
+		while (enumerator->enumerate(enumerator, &auth))
+		{
+			add_certreqs(&req, auth);
+		}
+		enumerator->destroy(enumerator);
+	}
+
+	if (!req)
+	{
+		/* otherwise add all trusted CA certificates */
+		enumerator = lib->credmgr->create_cert_enumerator(lib->credmgr,
+												CERT_ANY, KEY_ANY, NULL, TRUE);
+		while (enumerator->enumerate(enumerator, &cert))
+		{
+			add_certreq(&req, cert);
+		}
+		enumerator->destroy(enumerator);
+	}
+
+	if (req)
+	{
+		message->add_payload(message, (payload_t*)req);
+
+		if (lib->settings->get_bool(lib->settings,
+									"%s.hash_and_url", FALSE, charon->name))
+		{
+			message->add_notify(message, FALSE, HTTP_CERT_LOOKUP_SUPPORTED,
+								chunk_empty);
+			this->do_http_lookup = TRUE;
+		}
+	}
+}
+
+/**
+ * Check if this is the final authentication round
+ */
+static bool final_auth(message_t *message)
+{
+	/* we check for an AUTH payload without a ANOTHER_AUTH_FOLLOWS notify */
+	if (message->get_payload(message, AUTHENTICATION) == NULL)
+	{
+		return FALSE;
+	}
+	if (message->get_notify(message, ANOTHER_AUTH_FOLLOWS))
+	{
+		return FALSE;
+	}
+	return TRUE;
+}
+
+METHOD(task_t, build_i, status_t,
+	private_ike_cert_pre_t *this, message_t *message)
+{
+	if (message->get_message_id(message) == 1)
+	{	/* initiator sends CERTREQs in first IKE_AUTH */
+		build_certreqs(this, message);
+	}
+	return NEED_MORE;
+}
+
+METHOD(task_t, process_r, status_t,
+	private_ike_cert_pre_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) != IKE_SA_INIT)
+	{	/* handle certreqs/certs in any IKE_AUTH, just in case */
+		process_certreqs(this, message);
+		process_certs(this, message);
+	}
+	this->final = final_auth(message);
+	return NEED_MORE;
+}
+
+METHOD(task_t, build_r, status_t,
+	private_ike_cert_pre_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		build_certreqs(this, message);
+	}
+	if (this->final)
+	{
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+METHOD(task_t, process_i, status_t,
+	private_ike_cert_pre_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		process_certreqs(this, message);
+	}
+	process_certs(this, message);
+
+	if (final_auth(message))
+	{
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+METHOD(task_t, get_type, task_type_t,
+	private_ike_cert_pre_t *this)
+{
+	return TASK_IKE_CERT_PRE;
+}
+
+METHOD(task_t, migrate, void,
+	private_ike_cert_pre_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+}
+
+METHOD(task_t, destroy, void,
+	private_ike_cert_pre_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_cert_pre_t *ike_cert_pre_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_cert_pre_t *this;
+
+	INIT(this,
+		.public = {
+			.task = {
+				.get_type = _get_type,
+				.migrate = _migrate,
+				.destroy = _destroy,
+			},
+		},
+		.ike_sa = ike_sa,
+		.initiator = initiator,
+	);
+
+	if (initiator)
+	{
+		this->public.task.build = _build_i;
+		this->public.task.process = _process_i;
+	}
+	else
+	{
+		this->public.task.build = _build_r;
+		this->public.task.process = _process_r;
+	}
+
+	return &this->public;
+}