- New upstream release.

6 files changed, 1255 insertions, 0 deletions

diff --git a/src/libstrongswan/plugins/agent/Makefile.am b/src/libstrongswan/plugins/agent/Makefile.am
new file mode 100644
index 000000000..bc022aa26
--- /dev/null
+++ b/src/libstrongswan/plugins/agent/Makefile.am
@@ -0,0 +1,12 @@
+
+INCLUDES = -I$(top_srcdir)/src/libstrongswan
+
+AM_CFLAGS = -rdynamic
+
+plugin_LTLIBRARIES = libstrongswan-agent.la
+
+libstrongswan_agent_la_SOURCES = agent_plugin.h agent_plugin.c \
+  agent_private_key.c agent_private_key.h
+
+libstrongswan_agent_la_LDFLAGS = -module
+
diff --git a/src/libstrongswan/plugins/agent/Makefile.in b/src/libstrongswan/plugins/agent/Makefile.in
new file mode 100644
index 000000000..eb38b537a
--- /dev/null
+++ b/src/libstrongswan/plugins/agent/Makefile.in
@@ -0,0 +1,499 @@
+# Makefile.in generated by automake 1.10.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005, 2006, 2007, 2008  Free Software Foundation, Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
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+am_libstrongswan_agent_la_OBJECTS = agent_plugin.lo \
+	agent_private_key.lo
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+AM_CFLAGS = -rdynamic
+plugin_LTLIBRARIES = libstrongswan-agent.la
+libstrongswan_agent_la_SOURCES = agent_plugin.h agent_plugin.c \
+  agent_private_key.c agent_private_key.h
+
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+
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+	  esac; \
+	done; \
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+	cd $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu  src/libstrongswan/plugins/agent/Makefile
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+	  *config.status*) \
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+	    $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(pluginLTLIBRARIES_INSTALL) $(INSTALL_STRIP_FLAG) "$$p" "$(DESTDIR)$(plugindir)/$$f"; \
+	  else :; fi; \
+	done
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+	@list='$(plugin_LTLIBRARIES)'; for p in $$list; do \
+	  p=$(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(plugindir)/$$p'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(plugindir)/$$p"; \
+	done
+
+clean-pluginLTLIBRARIES:
+	-test -z "$(plugin_LTLIBRARIES)" || rm -f $(plugin_LTLIBRARIES)
+	@list='$(plugin_LTLIBRARIES)'; for p in $$list; do \
+	  dir="`echo $$p | sed -e 's|/[^/]*$$||'`"; \
+	  test "$$dir" != "$$p" || dir=.; \
+	  echo "rm -f \"$${dir}/so_locations\""; \
+	  rm -f "$${dir}/so_locations"; \
+	done
+libstrongswan-agent.la: $(libstrongswan_agent_la_OBJECTS) $(libstrongswan_agent_la_DEPENDENCIES) 
+	$(libstrongswan_agent_la_LINK) -rpath $(plugindir) $(libstrongswan_agent_la_OBJECTS) $(libstrongswan_agent_la_LIBADD) $(LIBS)
+
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+@am__fastdepCC_TRUE@	mv -f $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
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+	-rm -rf .libs _libs
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+	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+	  done | \
+	  $(AWK) '{ files[$$0] = 1; nonemtpy = 1; } \
+	      END { if (nonempty) { for (i in files) print i; }; }'`; \
+	mkid -fID $$unique
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+
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+	    fi; \
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+	    || cp -p $$d/$$file $(distdir)/$$file \
+	    || exit 1; \
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+	  `test -z '$(STRIP)' || \
+	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
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+uninstall-am: uninstall-pluginLTLIBRARIES
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+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
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diff --git a/src/libstrongswan/plugins/agent/agent_plugin.c b/src/libstrongswan/plugins/agent/agent_plugin.c
new file mode 100644
index 000000000..474171ad1
--- /dev/null
+++ b/src/libstrongswan/plugins/agent/agent_plugin.c
@@ -0,0 +1,59 @@
+/*
+ * 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.
+ *
+ * $Id$
+ */
+
+#include "agent_plugin.h"
+
+#include <library.h>
+#include "agent_private_key.h"
+
+typedef struct private_agent_plugin_t private_agent_plugin_t;
+
+/**
+ * private data of agent_plugin
+ */
+struct private_agent_plugin_t {
+
+	/**
+	 * public functions
+	 */
+	agent_plugin_t public;
+};
+
+/**
+ * Implementation of agent_plugin_t.agenttroy
+ */
+static void destroy(private_agent_plugin_t *this)
+{
+	lib->creds->remove_builder(lib->creds,
+							   (builder_constructor_t)agent_private_key_builder);
+	free(this);
+}
+
+/*
+ * see header file
+ */
+plugin_t *plugin_create()
+{
+	private_agent_plugin_t *this = malloc_thing(private_agent_plugin_t);
+	
+	this->public.plugin.destroy = (void(*)(plugin_t*))destroy;
+	
+	lib->creds->add_builder(lib->creds, CRED_PRIVATE_KEY, KEY_RSA,
+							(builder_constructor_t)agent_private_key_builder);
+	return &this->public.plugin;
+}
+
diff --git a/src/libstrongswan/plugins/agent/agent_plugin.h b/src/libstrongswan/plugins/agent/agent_plugin.h
new file mode 100644
index 000000000..d12dd44ac
--- /dev/null
+++ b/src/libstrongswan/plugins/agent/agent_plugin.h
@@ -0,0 +1,47 @@
+/*
+ * 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.
+ */
+
+/**
+ * @defgroup agent_p agent
+ * @ingroup plugins
+ * 
+ * @defgroup agent_plugin agent_plugin
+ * @{ @ingroup agent_p
+ */
+
+#ifndef AGENT_PLUGIN_H_
+#define AGENT_PLUGIN_H_
+
+#include <plugins/plugin.h>
+
+typedef struct agent_plugin_t agent_plugin_t;
+
+/**
+ * Plugin to use private keys loaded in a ssh-agent.
+ */
+struct agent_plugin_t {
+
+	/**
+	 * implements plugin interface
+	 */
+	plugin_t plugin;
+};
+
+/**
+ * Create a agent_plugin instance.
+ */
+plugin_t *plugin_create();
+
+#endif /* AGENT_PLUGIN_H_ @}*/
diff --git a/src/libstrongswan/plugins/agent/agent_private_key.c b/src/libstrongswan/plugins/agent/agent_private_key.c
new file mode 100644
index 000000000..a3b8eebf3
--- /dev/null
+++ b/src/libstrongswan/plugins/agent/agent_private_key.c
@@ -0,0 +1,590 @@
+/*
+ * 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.
+ *
+ * $Id$
+ */
+
+#include "agent_private_key.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <arpa/inet.h>
+#include <errno.h>
+
+#include <library.h>
+#include <chunk.h>
+#include <debug.h>
+#include <asn1/asn1.h>
+#include <asn1/oid.h>
+
+#ifndef UNIX_PATH_MAX
+#define UNIX_PATH_MAX 108
+#endif /* UNIX_PATH_MAX */
+
+typedef struct private_agent_private_key_t private_agent_private_key_t;
+typedef enum agent_msg_type_t agent_msg_type_t;
+
+/**
+ * Private data of a agent_private_key_t object.
+ */
+struct private_agent_private_key_t {
+	/**
+	 * Public interface for this signer.
+	 */
+	agent_private_key_t public;
+	
+	/**
+	 * ssh-agent unix socket connection
+	 */
+	int socket;
+	
+	/**
+	 * key identity blob in ssh format
+	 */
+	chunk_t key;
+	
+	/**
+	 * keysize in bytes
+	 */
+	size_t key_size;
+	
+	/**
+	 * Keyid formed as a SHA-1 hash of a publicKey object
+	 */
+	identification_t* keyid;
+
+	/**
+	 * Keyid formed as a SHA-1 hash of a publicKeyInfo object
+	 */
+	identification_t* keyid_info;
+	
+	/**
+	 * reference count
+	 */
+	refcount_t ref;	
+};
+
+/**
+ * Message types for ssh-agent protocol
+ */
+enum agent_msg_type_t {
+	SSH_AGENT_FAILURE = 5,
+	SSH_AGENT_SUCCESS =	6,
+	SSH_AGENT_ID_REQUEST = 11,
+	SSH_AGENT_ID_RESPONSE = 12,
+	SSH_AGENT_SIGN_REQUEST = 13,
+	SSH_AGENT_SIGN_RESPONSE = 14,
+};
+
+/**
+ * read a byte from a blob
+ */
+static u_char read_byte(chunk_t *blob)
+{
+	u_char val;
+
+	if (blob->len < sizeof(u_char))
+	{
+		return 0;
+	}
+	val = *(blob->ptr);
+	*blob = chunk_skip(*blob, sizeof(u_char));
+	return val;
+}
+
+/**
+ * read a u_int32_t from a blob
+ */
+static u_int32_t read_uint32(chunk_t *blob)
+{
+	u_int32_t val;
+
+	if (blob->len < sizeof(u_int32_t))
+	{
+		return 0;
+	}
+	val = ntohl(*(u_int32_t*)blob->ptr);
+	*blob = chunk_skip(*blob, sizeof(u_int32_t));
+	return val;
+}
+
+/**
+ * read a ssh-agent "string" length/value from a blob
+ */
+static chunk_t read_string(chunk_t *blob)
+{
+	int len;
+	chunk_t str;
+	
+	len = read_uint32(blob);
+	if (len > blob->len)
+	{
+		return chunk_empty;
+	}
+	str = chunk_create(blob->ptr, len);
+	*blob = chunk_skip(*blob, + len);
+	return str;
+}
+
+/**
+ * open socket connection to the ssh-agent
+ */
+static int open_connection(char *path)
+{
+	struct sockaddr_un addr;
+	int s;
+
+	s = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (s == -1)
+	{
+		DBG1("opening ssh-agent socket %s failed: %s:", path, strerror(errno));
+		return -1;
+	}
+	
+	addr.sun_family = AF_UNIX;
+	addr.sun_path[UNIX_PATH_MAX - 1] = '\0';
+	strncpy(addr.sun_path, path, UNIX_PATH_MAX - 1);
+	
+	if (connect(s, (struct sockaddr*)&addr, SUN_LEN(&addr)) != 0)
+	{
+		DBG1("connecting to ssh-agent socket failed: %s", strerror(errno));
+		close(s);
+		return -1;
+	}
+	return s;
+}
+
+/**
+ * check if the ssh agent key blob matches to our public key
+ */
+static bool matches_pubkey(chunk_t key, public_key_t *pubkey)
+{
+	chunk_t pubkeydata, hash, n, e;
+	hasher_t *hasher;
+	identification_t *id;
+	bool match;
+	
+	if (!pubkey)
+	{
+		return TRUE;
+	}
+	read_string(&key);
+	e = read_string(&key);
+	n = read_string(&key);
+	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
+	if (hasher == NULL)
+	{
+		return FALSE;
+	}
+	pubkeydata = asn1_wrap(ASN1_SEQUENCE, "mm", 
+						asn1_wrap(ASN1_INTEGER, "c", n),
+						asn1_wrap(ASN1_INTEGER, "c", e));
+	hasher->allocate_hash(hasher, pubkeydata, &hash);
+	free(pubkeydata.ptr);
+	id = pubkey->get_id(pubkey, ID_PUBKEY_SHA1);
+	if (!id)
+	{
+		return FALSE;
+	}
+	match = chunk_equals(id->get_encoding(id), hash);
+	free(hash.ptr);
+	return match;
+}
+
+/** 
+ * Get the first usable key from the agent
+ */
+static bool read_key(private_agent_private_key_t *this, public_key_t *pubkey)
+{
+	int len, count;
+	char buf[2048];
+	chunk_t blob = chunk_from_buf(buf), key, type, tmp;
+	
+	len = htonl(1);
+	write(this->socket, &len, sizeof(len));
+	buf[0] = SSH_AGENT_ID_REQUEST;
+	write(this->socket, &buf, 1);
+	
+	blob.len = read(this->socket, blob.ptr, blob.len);
+	
+	if (blob.len < sizeof(u_int32_t) + sizeof(u_char) ||
+		read_uint32(&blob) != blob.len ||
+		read_byte(&blob) != SSH_AGENT_ID_RESPONSE)
+	{
+		DBG1("received invalid ssh-agent identity response");
+		return FALSE;
+	}
+	count = read_uint32(&blob);
+	
+	while (blob.len)
+	{
+		key = read_string(&blob);
+		if (key.len)
+		{
+			tmp = key;
+			type = read_string(&tmp);
+			read_string(&tmp);
+			tmp = read_string(&tmp);
+			if (type.len && strneq("ssh-rsa", type.ptr, type.len) &&
+				tmp.len >= 512/8 && matches_pubkey(key, pubkey))
+			{
+				this->key = chunk_clone(key);
+				this->key_size = tmp.len;
+				if (tmp.ptr[0] == 0)
+				{
+					this->key_size--;
+				}
+				return TRUE;
+			}
+			continue;
+		}
+		break;
+	}
+	return FALSE;
+}
+
+/**
+ * Implementation of agent_private_key.destroy.
+ */
+static bool sign(private_agent_private_key_t *this, signature_scheme_t scheme, 
+				 chunk_t data, chunk_t *signature)
+{
+	u_int32_t len, flags;
+	char buf[2048];
+	chunk_t blob = chunk_from_buf(buf);
+	
+	if (scheme != SIGN_DEFAULT && scheme != SIGN_RSA_EMSA_PKCS1_SHA1)
+	{
+		DBG1("signature scheme %N not supported by ssh-agent",
+			 signature_scheme_names, scheme);
+		return FALSE;
+	}
+	
+	len = htonl(1 + sizeof(u_int32_t) * 3 + this->key.len + data.len);
+	write(this->socket, &len, sizeof(len));
+	buf[0] = SSH_AGENT_SIGN_REQUEST;
+	write(this->socket, &buf, 1);
+	
+	len = htonl(this->key.len);
+	write(this->socket, &len, sizeof(len));
+	write(this->socket, this->key.ptr, this->key.len);
+	
+	len = htonl(data.len);
+	write(this->socket, &len, sizeof(len));
+	write(this->socket, data.ptr, data.len);
+	
+	flags = htonl(0);
+	write(this->socket, &flags, sizeof(flags));
+	
+	blob.len = read(this->socket, blob.ptr, blob.len);
+	if (blob.len < sizeof(u_int32_t) + sizeof(u_char) ||
+		read_uint32(&blob) != blob.len ||
+		read_byte(&blob) != SSH_AGENT_SIGN_RESPONSE)
+	{
+		DBG1("received invalid ssh-agent signature response");
+		return FALSE;
+	}
+	/* parse length */
+	blob = read_string(&blob);
+	/* skip sig type */
+	read_string(&blob);
+	/* parse length */
+	blob = read_string(&blob);
+	if (!blob.len)
+	{
+		DBG1("received invalid ssh-agent signature response");
+		return FALSE;
+	}
+	*signature =  chunk_clone(blob);
+	return TRUE;
+}
+
+/**
+ * Implementation of agent_private_key.destroy.
+ */
+static key_type_t get_type(private_agent_private_key_t *this)
+{
+	return KEY_RSA;
+}
+
+/**
+ * Implementation of agent_private_key.destroy.
+ */
+static bool decrypt(private_agent_private_key_t *this,
+					chunk_t crypto, chunk_t *plain)
+{
+	DBG1("private key decryption not supported by ssh-agent");
+	return FALSE;
+}
+
+/**
+ * Implementation of agent_private_key.destroy.
+ */
+static size_t get_keysize(private_agent_private_key_t *this)
+{
+	return this->key_size;
+}
+
+/**
+ * Implementation of agent_private_key.destroy.
+ */
+static identification_t* get_id(private_agent_private_key_t *this,
+								id_type_t type)
+{
+	switch (type)
+	{
+		case ID_PUBKEY_INFO_SHA1:
+			return this->keyid_info;
+		case ID_PUBKEY_SHA1:
+			return this->keyid;
+		default:
+			return NULL;
+	}
+}
+
+/**
+ * Implementation of agent_private_key.get_public_key.
+ */
+static public_key_t* get_public_key(private_agent_private_key_t *this)
+{
+	chunk_t key, n, e, encoded;
+	public_key_t *public;
+	
+	key = this->key;
+	read_string(&key);
+	e = read_string(&key);
+	n = read_string(&key);
+	encoded = asn1_wrap(ASN1_SEQUENCE, "mm", 
+					asn1_wrap(ASN1_INTEGER, "c", n),
+					asn1_wrap(ASN1_INTEGER, "c", e));
+
+	public = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_RSA, 
+								BUILD_BLOB_ASN1_DER, encoded, BUILD_END);
+	free(encoded.ptr);
+	return public;
+}
+
+/**
+ * Implementation of agent_private_key.belongs_to.
+ */
+static bool belongs_to(private_agent_private_key_t *this, public_key_t *public)
+{
+	identification_t *keyid;
+
+	if (public->get_type(public) != KEY_RSA)
+	{
+		return FALSE;
+	}
+	keyid = public->get_id(public, ID_PUBKEY_SHA1);
+	if (keyid && keyid->equals(keyid, this->keyid))
+	{
+		return TRUE;
+	}
+	keyid = public->get_id(public, ID_PUBKEY_INFO_SHA1);
+	if (keyid && keyid->equals(keyid, this->keyid_info))
+	{
+		return TRUE;
+	}
+	return FALSE;
+}
+
+/**
+ * Build the RSA key identifier from n and e using SHA1 hashed publicKey(Info).
+ */
+static bool build_ids(private_agent_private_key_t *this)
+{
+	chunk_t publicKeyInfo, publicKey, hash, key, n, e;
+	hasher_t *hasher;
+	
+	key = this->key;
+	read_string(&key);
+	e = read_string(&key);
+	n = read_string(&key);
+	
+	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
+	if (hasher == NULL)
+	{
+		DBG1("SHA1 hash algorithm not supported, unable to use RSA");
+		return FALSE;
+	}
+	publicKey = asn1_wrap(ASN1_SEQUENCE, "mm", 
+					asn1_wrap(ASN1_INTEGER, "c", n),
+					asn1_wrap(ASN1_INTEGER, "c", e));
+	hasher->allocate_hash(hasher, publicKey, &hash);
+	this->keyid = identification_create_from_encoding(ID_PUBKEY_SHA1, hash);
+	chunk_free(&hash);
+	
+	publicKeyInfo = asn1_wrap(ASN1_SEQUENCE, "cm",
+						asn1_algorithmIdentifier(OID_RSA_ENCRYPTION),
+						asn1_bitstring("m", publicKey));
+	hasher->allocate_hash(hasher, publicKeyInfo, &hash);
+	this->keyid_info = identification_create_from_encoding(ID_PUBKEY_INFO_SHA1, hash);
+	chunk_free(&hash);
+	
+	hasher->destroy(hasher);
+	chunk_free(&publicKeyInfo);
+	return TRUE;
+}
+
+/**
+ * Implementation of private_key_t.get_encoding.
+ */
+static chunk_t get_encoding(private_agent_private_key_t *this)
+{
+	return chunk_empty;
+}
+
+/**
+ * Implementation of agent_private_key.get_ref.
+ */
+static private_agent_private_key_t* get_ref(private_agent_private_key_t *this)
+{
+	ref_get(&this->ref);
+	return this;
+}
+
+/**
+ * Implementation of agent_private_key.destroy.
+ */
+static void destroy(private_agent_private_key_t *this)
+{
+	if (ref_put(&this->ref))
+	{
+		close(this->socket);
+		DESTROY_IF(this->keyid);
+		DESTROY_IF(this->keyid_info);
+		free(this->key.ptr);
+		free(this);
+	}
+}
+
+/**
+ * Internal constructor
+ */
+static agent_private_key_t *agent_private_key_create(char *path,
+													 public_key_t *pubkey)
+{
+	private_agent_private_key_t *this = malloc_thing(private_agent_private_key_t);
+	
+	this->public.interface.get_type = (key_type_t (*)(private_key_t *this))get_type;
+	this->public.interface.sign = (bool (*)(private_key_t *this, signature_scheme_t scheme, chunk_t data, chunk_t *signature))sign;
+	this->public.interface.decrypt = (bool (*)(private_key_t *this, chunk_t crypto, chunk_t *plain))decrypt;
+	this->public.interface.get_keysize = (size_t (*) (private_key_t *this))get_keysize;
+	this->public.interface.get_id = (identification_t* (*) (private_key_t *this,id_type_t))get_id;
+	this->public.interface.get_public_key = (public_key_t* (*)(private_key_t *this))get_public_key;
+	this->public.interface.belongs_to = (bool (*) (private_key_t *this, public_key_t *public))belongs_to;
+	this->public.interface.get_encoding = (chunk_t(*)(private_key_t*))get_encoding;
+	this->public.interface.get_ref = (private_key_t* (*)(private_key_t *this))get_ref;
+	this->public.interface.destroy = (void (*)(private_key_t *this))destroy;
+	
+	this->socket = open_connection(path);
+	if (this->socket < 0)
+	{
+		free(this);
+		return NULL;
+	}
+	this->key = chunk_empty;
+	this->keyid = NULL;
+	this->keyid_info = NULL;
+	this->ref = 1;
+	if (!read_key(this, pubkey) || !build_ids(this))
+	{
+		destroy(this);
+		return NULL;
+	}
+	return &this->public;
+}
+
+typedef struct private_builder_t private_builder_t;
+/**
+ * Builder implementation for key loading/generation
+ */
+struct private_builder_t {
+	/** implements the builder interface */
+	builder_t public;
+	/** agent unix socket */
+	char *socket;
+	/** matching public key */
+	public_key_t *pubkey;
+};
+
+/**
+ * Implementation of builder_t.build
+ */
+static agent_private_key_t *build(private_builder_t *this)
+{
+	agent_private_key_t *key = NULL;
+	
+	if (this->socket)
+	{
+		key = agent_private_key_create(this->socket, this->pubkey);
+	}
+	free(this);
+	return key;
+}
+
+/**
+ * Implementation of builder_t.add
+ */
+static void add(private_builder_t *this, builder_part_t part, ...)
+{
+	va_list args;
+	
+	switch (part)
+	{
+		case BUILD_AGENT_SOCKET:
+		{
+			va_start(args, part);
+			this->socket = va_arg(args, char*);
+			va_end(args);
+			return;
+		}
+		case BUILD_PUBLIC_KEY:
+		{
+			va_start(args, part);
+			this->pubkey = va_arg(args, public_key_t*);
+			va_end(args);
+			return;
+		}
+		default:
+			break;
+	}
+	builder_cancel(&this->public);
+}
+
+/**
+ * Builder construction function
+ */
+builder_t *agent_private_key_builder(key_type_t type)
+{
+	private_builder_t *this;
+	
+	if (type != KEY_RSA)
+	{
+		return NULL;
+	}
+	
+	this = malloc_thing(private_builder_t);
+	
+	this->pubkey = NULL;
+	this->socket = NULL;
+	this->public.add = (void(*)(builder_t *this, builder_part_t part, ...))add;
+	this->public.build = (void*(*)(builder_t *this))build;
+	
+	return &this->public;
+}
+
diff --git a/src/libstrongswan/plugins/agent/agent_private_key.h b/src/libstrongswan/plugins/agent/agent_private_key.h
new file mode 100644
index 000000000..4d678dd08
--- /dev/null
+++ b/src/libstrongswan/plugins/agent/agent_private_key.h
@@ -0,0 +1,48 @@
+/*
+ * 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.
+ */
+
+/**
+ * @defgroup agent_private_key agent_private_key
+ * @{ @ingroup agent_p
+ */
+
+#ifndef AGENT_PRIVATE_KEY_H_
+#define AGENT_PRIVATE_KEY_H_
+
+#include <credentials/keys/private_key.h>
+
+typedef struct agent_private_key_t agent_private_key_t;
+
+/**
+ * private_key_t implementation using an ssh-agent.
+ */
+struct agent_private_key_t {
+
+	/**
+	 * Implements private_key_t interface
+	 */
+	private_key_t interface;
+};
+
+/**
+ * Create the builder for a private key.
+ *
+ * @param type		type of the key
+ * @return 			builder instance
+ */
+builder_t *agent_private_key_builder(key_type_t type);
+
+#endif /*AGENT_PRIVATE_KEY_H_ @}*/
+