1 files changed, 447 insertions, 0 deletions
diff --git a/src/libcharon/plugins/nm/nm_creds.c b/src/libcharon/plugins/nm/nm_creds.c
new file mode 100644
index 000000000..193838e6b
--- /dev/null
+++ b/src/libcharon/plugins/nm/nm_creds.c
@@ -0,0 +1,447 @@
+/*
+ * Copyright (C) 2008 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 "nm_creds.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <daemon.h>
+#include <threading/rwlock.h>
+#include <credentials/certificates/x509.h>
+
+typedef struct private_nm_creds_t private_nm_creds_t;
+
+/**
+ * private data of nm_creds
+ */
+struct private_nm_creds_t {
+
+	/**
+	 * public functions
+	 */
+	nm_creds_t public;
+
+	/**
+	 * List of trusted certificates, certificate_t*
+	 */
+	linked_list_t *certs;
+
+	/**
+	 * User name
+	 */
+	identification_t *user;
+
+	/**
+	 * User password
+	 */
+	char *pass;
+
+	/**
+	 * users certificate
+	 */
+	certificate_t *usercert;
+
+	/**
+	 * users private key
+	 */
+	private_key_t *key;
+
+	/**
+	 * read/write lock
+	 */
+	rwlock_t *lock;
+};
+
+/**
+ * Enumerator for user certificate
+ */
+static enumerator_t *create_usercert_enumerator(private_nm_creds_t *this,
+							certificate_type_t cert, key_type_t key)
+{
+	public_key_t *public;
+
+	if (cert != CERT_ANY && cert != this->usercert->get_type(this->usercert))
+	{
+		return NULL;
+	}
+	if (key != KEY_ANY)
+	{
+		public = this->usercert->get_public_key(this->usercert);
+		if (!public)
+		{
+			return NULL;
+		}
+		if (public->get_type(public) != key)
+		{
+			public->destroy(public);
+			return NULL;
+		}
+		public->destroy(public);
+	}
+	this->lock->read_lock(this->lock);
+	return enumerator_create_cleaner(
+								enumerator_create_single(this->usercert, NULL),
+								(void*)this->lock->unlock, this->lock);
+}
+
+/**
+ * CA certificate enumerator data
+ */
+typedef struct {
+	/** ref to credential credential store */
+	private_nm_creds_t *this;
+	/** type of key we are looking for */
+	key_type_t key;
+	/** CA certificate ID */
+	identification_t *id;
+} cert_data_t;
+
+/**
+ * Destroy CA certificate enumerator data
+ */
+static void cert_data_destroy(cert_data_t *data)
+{
+	data->this->lock->unlock(data->this->lock);
+	free(data);
+}
+
+/**
+ * Filter function for certificates enumerator
+ */
+static bool cert_filter(cert_data_t *data, certificate_t **in,
+						 certificate_t **out)
+{
+	certificate_t *cert = *in;
+	public_key_t *public;
+
+	public = cert->get_public_key(cert);
+	if (!public)
+	{
+		return FALSE;
+	}
+	if (data->key != KEY_ANY && public->get_type(public) != data->key)
+	{
+		public->destroy(public);
+		return FALSE;
+	}
+	if (data->id && data->id->get_type(data->id) == ID_KEY_ID &&
+		public->has_fingerprint(public, data->id->get_encoding(data->id)))
+	{
+		public->destroy(public);
+		*out = cert;
+		return TRUE;
+	}
+	public->destroy(public);
+	if (data->id && !cert->has_subject(cert, data->id))
+	{
+		return FALSE;
+	}
+	*out = cert;
+	return TRUE;
+}
+
+/**
+ * Create enumerator for trusted certificates
+ */
+static enumerator_t *create_trusted_cert_enumerator(private_nm_creds_t *this,
+										key_type_t key, identification_t *id)
+{
+	cert_data_t *data = malloc_thing(cert_data_t);
+
+	data->this = this;
+	data->id = id;
+	data->key = key;
+
+	this->lock->read_lock(this->lock);
+	return enumerator_create_filter(
+					this->certs->create_enumerator(this->certs),
+					(void*)cert_filter, data, (void*)cert_data_destroy);
+}
+
+/**
+ * Implements credential_set_t.create_cert_enumerator
+ */
+static enumerator_t* create_cert_enumerator(private_nm_creds_t *this,
+							certificate_type_t cert, key_type_t key,
+							identification_t *id, bool trusted)
+{
+	if (id && this->usercert &&
+		id->equals(id, this->usercert->get_subject(this->usercert)))
+	{
+		return create_usercert_enumerator(this, cert, key);
+	}
+	if (cert == CERT_X509 || cert == CERT_ANY)
+	{
+		return create_trusted_cert_enumerator(this, key, id);
+	}
+	return NULL;
+}
+
+/**
+ * Implements credential_set_t.create_cert_enumerator
+ */
+static enumerator_t* create_private_enumerator(private_nm_creds_t *this,
+										key_type_t type, identification_t *id)
+{
+	if (this->key == NULL)
+	{
+		return NULL;
+	}
+	if (type != KEY_ANY && type != this->key->get_type(this->key))
+	{
+		return NULL;
+	}
+	if (id && id->get_type(id) != ID_ANY)
+	{
+		if (id->get_type(id) != ID_KEY_ID ||
+			!this->key->has_fingerprint(this->key, id->get_encoding(id)))
+		{
+			return NULL;
+		}
+	}
+	this->lock->read_lock(this->lock);
+	return enumerator_create_cleaner(enumerator_create_single(this->key, NULL),
+									 (void*)this->lock->unlock, this->lock);
+}
+
+/**
+ * shared key enumerator implementation
+ */
+typedef struct {
+	enumerator_t public;
+	private_nm_creds_t *this;
+	shared_key_t *key;
+	bool done;
+} shared_enumerator_t;
+
+/**
+ * enumerate function for shared enumerator
+ */
+static bool shared_enumerate(shared_enumerator_t *this, shared_key_t **key,
+							 id_match_t *me, id_match_t *other)
+{
+	if (this->done)
+	{
+		return FALSE;
+	}
+	*key = this->key;
+	*me = ID_MATCH_PERFECT;
+	*other = ID_MATCH_ANY;
+	this->done = TRUE;
+	return TRUE;
+}
+
+/**
+ * Destroy function for shared enumerator
+ */
+static void shared_destroy(shared_enumerator_t *this)
+{
+	this->key->destroy(this->key);
+	this->this->lock->unlock(this->this->lock);
+	free(this);
+}
+/**
+ * Implements credential_set_t.create_cert_enumerator
+ */
+static enumerator_t* create_shared_enumerator(private_nm_creds_t *this,
+							shared_key_type_t type,	identification_t *me,
+							identification_t *other)
+{
+	shared_enumerator_t *enumerator;
+
+	if (!this->pass || !this->user)
+	{
+		return NULL;
+	}
+	if (type != SHARED_EAP && type != SHARED_IKE)
+	{
+		return NULL;
+	}
+	if (me && !me->equals(me, this->user))
+	{
+		return NULL;
+	}
+
+	enumerator = malloc_thing(shared_enumerator_t);
+	enumerator->public.enumerate = (void*)shared_enumerate;
+	enumerator->public.destroy = (void*)shared_destroy;
+	enumerator->this = this;
+	enumerator->done = FALSE;
+	this->lock->read_lock(this->lock);
+	enumerator->key = shared_key_create(type,
+										chunk_clone(chunk_create(this->pass,
+													strlen(this->pass))));
+	return &enumerator->public;
+}
+
+/**
+ * Implementation of nm_creds_t.add_certificate
+ */
+static void add_certificate(private_nm_creds_t *this, certificate_t *cert)
+{
+	this->lock->write_lock(this->lock);
+	this->certs->insert_last(this->certs, cert);
+	this->lock->unlock(this->lock);
+}
+
+/**
+ * Load a certificate file
+ */
+static void load_ca_file(private_nm_creds_t *this, char *file)
+{
+	certificate_t *cert;
+
+	/* We add the CA constraint, as many CAs miss it */
+	cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
+							  BUILD_FROM_FILE, file, BUILD_END);
+	if (!cert)
+	{
+		DBG1(DBG_CFG, "loading CA certificate '%s' failed", file);
+	}
+	else
+	{
+		DBG2(DBG_CFG, "loaded CA certificate '%Y'", cert->get_subject(cert));
+		x509_t *x509 = (x509_t*)cert;
+		if (!(x509->get_flags(x509) & X509_SELF_SIGNED))
+		{
+			DBG1(DBG_CFG, "%Y is not self signed", cert->get_subject(cert));
+		}
+		this->certs->insert_last(this->certs, cert);
+	}
+}
+
+/**
+ * Implementation of nm_creds_t.load_ca_dir
+ */
+static void load_ca_dir(private_nm_creds_t *this, char *dir)
+{
+	enumerator_t *enumerator;
+	char *rel, *abs;
+	struct stat st;
+
+	enumerator = enumerator_create_directory(dir);
+	if (enumerator)
+	{
+		while (enumerator->enumerate(enumerator, &rel, &abs, &st))
+		{
+			/* skip '.', '..' and hidden files */
+			if (rel[0] != '.')
+			{
+				if (S_ISDIR(st.st_mode))
+				{
+					load_ca_dir(this, abs);
+				}
+				else if (S_ISREG(st.st_mode))
+				{
+					load_ca_file(this, abs);
+				}
+			}
+		}
+		enumerator->destroy(enumerator);
+	}
+}
+
+/**
+ * Implementation of nm_creds_t.set_password
+ */
+static void set_username_password(private_nm_creds_t *this, identification_t *id,
+						 char *password)
+{
+	this->lock->write_lock(this->lock);
+	DESTROY_IF(this->user);
+	this->user = id->clone(id);
+	free(this->pass);
+	this->pass = password ? strdup(password) : NULL;
+	this->lock->unlock(this->lock);
+}
+
+/**
+ * Implementation of nm_creds_t.set_cert_and_key
+ */
+static void set_cert_and_key(private_nm_creds_t *this, certificate_t *cert,
+							 private_key_t *key)
+{
+	this->lock->write_lock(this->lock);
+	DESTROY_IF(this->key);
+	DESTROY_IF(this->usercert);
+	this->key = key;
+	this->usercert = cert;
+	this->lock->unlock(this->lock);
+}
+
+/**
+ * Implementation of nm_creds_t.clear
+ */
+static void clear(private_nm_creds_t *this)
+{
+	certificate_t *cert;
+
+	while (this->certs->remove_last(this->certs, (void**)&cert) == SUCCESS)
+	{
+		cert->destroy(cert);
+	}
+	DESTROY_IF(this->user);
+	free(this->pass);
+	DESTROY_IF(this->usercert);
+	DESTROY_IF(this->key);
+	this->key = NULL;
+	this->usercert = NULL;
+	this->pass = NULL;
+	this->user = NULL;
+}
+
+/**
+ * Implementation of nm_creds_t.destroy
+ */
+static void destroy(private_nm_creds_t *this)
+{
+	clear(this);
+	this->certs->destroy(this->certs);
+	this->lock->destroy(this->lock);
+	free(this);
+}
+
+/*
+ * see header file
+ */
+nm_creds_t *nm_creds_create()
+{
+	private_nm_creds_t *this = malloc_thing(private_nm_creds_t);
+
+	this->public.set.create_private_enumerator = (void*)create_private_enumerator;
+	this->public.set.create_cert_enumerator = (void*)create_cert_enumerator;
+	this->public.set.create_shared_enumerator = (void*)create_shared_enumerator;
+	this->public.set.create_cdp_enumerator = (void*)return_null;
+	this->public.set.cache_cert = (void*)nop;
+	this->public.add_certificate = (void(*)(nm_creds_t*, certificate_t *cert))add_certificate;
+	this->public.load_ca_dir = (void(*)(nm_creds_t*, char *dir))load_ca_dir;
+	this->public.set_username_password = (void(*)(nm_creds_t*, identification_t *id, char *password))set_username_password;
+	this->public.set_cert_and_key = (void(*)(nm_creds_t*, certificate_t *cert, private_key_t *key))set_cert_and_key;
+	this->public.clear = (void(*)(nm_creds_t*))clear;
+	this->public.destroy = (void(*)(nm_creds_t*))destroy;
+
+	this->lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
+
+	this->certs = linked_list_create();
+	this->user = NULL;
+	this->pass = NULL;
+	this->usercert = NULL;
+	this->key = NULL;
+
+	return &this->public;
+}
+