Moved credential manager to libstrongswan

src/libstrongswan/credentials/sets/auth_cfg_wrapper.c

@@ -0,0 +1,223 @@
+/*
+ * Copyright (C) 2008-2009 Martin Willi
+ * Copyright (C) 2008 Tobias Brunner
+ * 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 <library.h>
+#include <debug.h>
+
+#include "auth_cfg_wrapper.h"
+
+typedef struct private_auth_cfg_wrapper_t private_auth_cfg_wrapper_t;
+
+/**
+ * private data of auth_cfg_wrapper
+ */
+struct private_auth_cfg_wrapper_t {
+
+	/**
+	 * public functions
+	 */
+	auth_cfg_wrapper_t public;
+
+	/**
+	 * wrapped auth info
+	 */
+	auth_cfg_t *auth;
+};
+
+/**
+ * enumerator for auth_cfg_wrapper_t.create_cert_enumerator()
+ */
+typedef struct {
+	/** implements enumerator_t */
+	enumerator_t public;
+	/** inner enumerator from auth_cfg */
+	enumerator_t *inner;
+	/** wrapped auth round */
+	auth_cfg_t *auth;
+	/** enumerated cert type */
+	certificate_type_t cert;
+	/** enumerated key type */
+	key_type_t key;
+	/** enumerated id */
+	identification_t *id;
+} wrapper_enumerator_t;
+
+/**
+ * Tries to fetch a certificate that was supplied as "Hash and URL"
+ * (replaces rule type and value in place).
+ */
+static bool fetch_cert(wrapper_enumerator_t *enumerator,
+					   auth_rule_t *rule, void **value)
+{
+	char *url = (char*)*value;
+	if (!url)
+	{
+		/* fetching the certificate previously failed */
+		return FALSE;
+	}
+
+	chunk_t data;
+	certificate_t *cert;
+
+	DBG1(DBG_CFG, "  fetching certificate from '%s' ...", url);
+	if (lib->fetcher->fetch(lib->fetcher, url, &data, FETCH_END) != SUCCESS)
+	{
+		DBG1(DBG_CFG, "  fetching certificate failed");
+		/* we set the item to NULL, so we can skip it */
+		enumerator->auth->replace(enumerator->auth, enumerator->inner,
+								  *rule, NULL);
+		return FALSE;
+	}
+
+	cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
+							  BUILD_BLOB_ASN1_DER, data, BUILD_END);
+	free(data.ptr);
+
+	if (!cert)
+	{
+		DBG1(DBG_CFG, "  parsing fetched certificate failed");
+		/* we set the item to NULL, so we can skip it */
+		enumerator->auth->replace(enumerator->auth, enumerator->inner,
+								  *rule, NULL);
+		return FALSE;
+	}
+
+	DBG1(DBG_CFG, "  fetched certificate \"%Y\"", cert->get_subject(cert));
+	lib->credmgr->cache_cert(lib->credmgr, cert);
+
+	if (*rule == AUTH_HELPER_IM_HASH_URL)
+	{
+		*rule = AUTH_HELPER_IM_CERT;
+	}
+	else
+	{
+		*rule = AUTH_HELPER_SUBJECT_CERT;
+	}
+	*value = cert;
+	enumerator->auth->replace(enumerator->auth, enumerator->inner,
+							  *rule, cert->get_ref(cert));
+	return TRUE;
+}
+
+/**
+ * enumerate function for wrapper_enumerator_t
+ */
+static bool enumerate(wrapper_enumerator_t *this, certificate_t **cert)
+{
+	auth_rule_t rule;
+	certificate_t *current;
+	public_key_t *public;
+
+	while (this->inner->enumerate(this->inner, &rule, &current))
+	{
+		if (rule == AUTH_HELPER_IM_HASH_URL ||
+			rule == AUTH_HELPER_SUBJECT_HASH_URL)
+		{	/* on-demand fetching of hash and url certificates */
+			if (!fetch_cert(this, &rule, (void**)&current))
+			{
+				continue;
+			}
+		}
+		else if (rule != AUTH_HELPER_SUBJECT_CERT &&
+				 rule != AUTH_HELPER_IM_CERT)
+		{	/* handle only HELPER certificates */
+			continue;
+		}
+		if (this->cert != CERT_ANY && this->cert != current->get_type(current))
+		{	/* CERT type requested, but does not match */
+			continue;
+		}
+		public = current->get_public_key(current);
+		if (this->key != KEY_ANY && !public)
+		{	/* key type requested, but no public key */
+			DESTROY_IF(public);
+			continue;
+		}
+		if (this->key != KEY_ANY && public && this->key != public->get_type(public))
+		{	/* key type requested, but public key has another type */
+			DESTROY_IF(public);
+			continue;
+		}
+		DESTROY_IF(public);
+		if (this->id && !current->has_subject(current, this->id))
+		{	/* subject requested, but does not match */
+			continue;
+		}
+		*cert = current;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+/**
+ * destroy function for wrapper_enumerator_t
+ */
+static void wrapper_enumerator_destroy(wrapper_enumerator_t *this)
+{
+	this->inner->destroy(this->inner);
+	free(this);
+}
+
+/**
+ * implementation of auth_cfg_wrapper_t.set.create_cert_enumerator
+ */
+static enumerator_t *create_enumerator(private_auth_cfg_wrapper_t *this,
+									   certificate_type_t cert, key_type_t key,
+									   identification_t *id, bool trusted)
+{
+	wrapper_enumerator_t *enumerator;
+
+	if (trusted)
+	{
+		return NULL;
+	}
+	enumerator = malloc_thing(wrapper_enumerator_t);
+	enumerator->auth = this->auth;
+	enumerator->cert = cert;
+	enumerator->key = key;
+	enumerator->id = id;
+	enumerator->inner = this->auth->create_enumerator(this->auth);
+	enumerator->public.enumerate = (void*)enumerate;
+	enumerator->public.destroy = (void*)wrapper_enumerator_destroy;
+	return &enumerator->public;
+}
+
+/**
+ * Implementation of auth_cfg_wrapper_t.destroy
+ */
+static void destroy(private_auth_cfg_wrapper_t *this)
+{
+	free(this);
+}
+
+/*
+ * see header file
+ */
+auth_cfg_wrapper_t *auth_cfg_wrapper_create(auth_cfg_t *auth)
+{
+	private_auth_cfg_wrapper_t *this = malloc_thing(private_auth_cfg_wrapper_t);
+
+	this->public.set.create_private_enumerator = (void*)return_null;
+	this->public.set.create_cert_enumerator = (void*)create_enumerator;
+	this->public.set.create_shared_enumerator = (void*)return_null;
+	this->public.set.create_cdp_enumerator = (void*)return_null;
+	this->public.set.cache_cert = (void*)nop;
+	this->public.destroy = (void(*)(auth_cfg_wrapper_t*))destroy;
+
+	this->auth = auth;
+
+	return &this->public;
+}