diff options
Diffstat (limited to 'src/libcharon/plugins/eap_ttls')
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/Makefile.am | 21 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/Makefile.in | 615 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls.c | 165 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls.h | 59 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls_avp.c | 187 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls_avp.h | 68 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls_peer.c | 316 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls_peer.h | 47 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls_plugin.c | 52 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls_plugin.h | 47 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls_server.c | 365 | ||||
| -rw-r--r-- | src/libcharon/plugins/eap_ttls/eap_ttls_server.h | 47 |
12 files changed, 1989 insertions, 0 deletions
diff --git a/src/libcharon/plugins/eap_ttls/Makefile.am b/src/libcharon/plugins/eap_ttls/Makefile.am new file mode 100644 index 000000000..94ce5cc1e --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/Makefile.am @@ -0,0 +1,21 @@ + +INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/libhydra \ + -I$(top_srcdir)/src/libcharon -I$(top_srcdir)/src/libtls + +AM_CFLAGS = -rdynamic + +if MONOLITHIC +noinst_LTLIBRARIES = libstrongswan-eap-ttls.la +else +plugin_LTLIBRARIES = libstrongswan-eap-ttls.la +libstrongswan_eap_ttls_la_LIBADD = $(top_builddir)/src/libtls/libtls.la +endif + +libstrongswan_eap_ttls_la_SOURCES = \ + eap_ttls_plugin.h eap_ttls_plugin.c \ + eap_ttls_avp.h eap_ttls_avp.c \ + eap_ttls.h eap_ttls.c \ + eap_ttls_peer.h eap_ttls_peer.c \ + eap_ttls_server.h eap_ttls_server.c + +libstrongswan_eap_ttls_la_LDFLAGS = -module -avoid-version diff --git a/src/libcharon/plugins/eap_ttls/Makefile.in b/src/libcharon/plugins/eap_ttls/Makefile.in new file mode 100644 index 000000000..2cdd7701d --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/Makefile.in @@ -0,0 +1,615 @@ +# Makefile.in generated by automake 1.11.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008, 2009 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@ + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkglibexecdir = $(libexecdir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && 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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 "eap_ttls.h" +#include "eap_ttls_peer.h" +#include "eap_ttls_server.h" + +#include <tls_eap.h> + +#include <daemon.h> +#include <library.h> + +typedef struct private_eap_ttls_t private_eap_ttls_t; + +/** + * Private data of an eap_ttls_t object. + */ +struct private_eap_ttls_t { + + /** + * Public interface. + */ + eap_ttls_t public; + + /** + * TLS stack, wrapped by EAP helper + */ + tls_eap_t *tls_eap; +}; + +/** Maximum number of EAP-TTLS messages/fragments allowed */ +#define MAX_MESSAGE_COUNT 32 +/** Default size of a EAP-TTLS fragment */ +#define MAX_FRAGMENT_LEN 1024 + +METHOD(eap_method_t, initiate, status_t, + private_eap_ttls_t *this, eap_payload_t **out) +{ + chunk_t data; + + if (this->tls_eap->initiate(this->tls_eap, &data) == NEED_MORE) + { + *out = eap_payload_create_data(data); + free(data.ptr); + return NEED_MORE; + } + return FAILED; +} + +METHOD(eap_method_t, process, status_t, + private_eap_ttls_t *this, eap_payload_t *in, eap_payload_t **out) +{ + status_t status; + chunk_t data; + + data = in->get_data(in); + status = this->tls_eap->process(this->tls_eap, data, &data); + if (status == NEED_MORE) + { + *out = eap_payload_create_data(data); + free(data.ptr); + } + return status; +} + +METHOD(eap_method_t, get_type, eap_type_t, + private_eap_ttls_t *this, u_int32_t *vendor) +{ + *vendor = 0; + return EAP_TTLS; +} + +METHOD(eap_method_t, get_msk, status_t, + private_eap_ttls_t *this, chunk_t *msk) +{ + *msk = this->tls_eap->get_msk(this->tls_eap); + if (msk->len) + { + return SUCCESS; + } + return FAILED; +} + +METHOD(eap_method_t, is_mutual, bool, + private_eap_ttls_t *this) +{ + return TRUE; +} + +METHOD(eap_method_t, destroy, void, + private_eap_ttls_t *this) +{ + this->tls_eap->destroy(this->tls_eap); + free(this); +} + +/** + * Generic private constructor + */ +static eap_ttls_t *eap_ttls_create(identification_t *server, + identification_t *peer, bool is_server, + tls_application_t *application) +{ + private_eap_ttls_t *this; + size_t frag_size; + int max_msg_count; + tls_t *tls; + + INIT(this, + .public = { + .eap_method = { + .initiate = _initiate, + .process = _process, + .get_type = _get_type, + .is_mutual = _is_mutual, + .get_msk = _get_msk, + .destroy = _destroy, + }, + }, + ); + if (is_server && !lib->settings->get_bool(lib->settings, + "charon.plugins.eap-ttls.request_peer_auth", FALSE)) + { + peer = NULL; + } + frag_size = lib->settings->get_int(lib->settings, + "charon.plugins.eap-ttls.fragment_size", MAX_FRAGMENT_LEN); + max_msg_count = lib->settings->get_int(lib->settings, + "charon.plugins.eap-ttls.max_message_count", MAX_MESSAGE_COUNT); + tls = tls_create(is_server, server, peer, TLS_PURPOSE_EAP_TTLS, application); + this->tls_eap = tls_eap_create(EAP_TTLS, tls, frag_size, max_msg_count); + if (!this->tls_eap) + { + application->destroy(application); + free(this); + return NULL; + } + return &this->public; +} + +eap_ttls_t *eap_ttls_create_server(identification_t *server, + identification_t *peer) +{ + return eap_ttls_create(server, peer, TRUE, + &eap_ttls_server_create(server, peer)->application); +} + +eap_ttls_t *eap_ttls_create_peer(identification_t *server, + identification_t *peer) +{ + return eap_ttls_create(server, peer, FALSE, + &eap_ttls_peer_create(server, peer)->application); +} diff --git a/src/libcharon/plugins/eap_ttls/eap_ttls.h b/src/libcharon/plugins/eap_ttls/eap_ttls.h new file mode 100644 index 000000000..6e3bf2ceb --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/eap_ttls.h @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2010 Andreas Steffen + * Copyright (C) 2010 HSR 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 eap_ttls_i eap_ttls + * @{ @ingroup eap_ttls + */ + +#ifndef EAP_TTLS_H_ +#define EAP_TTLS_H_ + +typedef struct eap_ttls_t eap_ttls_t; + +#include <sa/authenticators/eap/eap_method.h> + +/** + * Implementation of eap_method_t using EAP-TTLS. + */ +struct eap_ttls_t { + + /** + * Implements eap_method_t interface. + */ + eap_method_t eap_method; +}; + +/** + * Creates the EAP method EAP-TTLS acting as server. + * + * @param server ID of the EAP server + * @param peer ID of the EAP client + * @return eap_ttls_t object + */ +eap_ttls_t *eap_ttls_create_server(identification_t *server, + identification_t *peer); + +/** + * Creates the EAP method EAP-TTLS acting as peer. + * + * @param server ID of the EAP server + * @param peer ID of the EAP client + * @return eap_ttls_t object + */ +eap_ttls_t *eap_ttls_create_peer(identification_t *server, + identification_t *peer); + +#endif /** EAP_TTLS_H_ @}*/ diff --git a/src/libcharon/plugins/eap_ttls/eap_ttls_avp.c b/src/libcharon/plugins/eap_ttls/eap_ttls_avp.c new file mode 100644 index 000000000..0eb5e94be --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/eap_ttls_avp.c @@ -0,0 +1,187 @@ +/* + * Copyright (C) 2010 Andreas Steffen + * Copyright (C) 2010 HSR 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 "eap_ttls_avp.h" + +#include <debug.h> + +#define AVP_EAP_MESSAGE 79 +#define AVP_HEADER_LEN 8 + +typedef struct private_eap_ttls_avp_t private_eap_ttls_avp_t; + +/** + * Private data of an eap_ttls_avp_t object. + */ +struct private_eap_ttls_avp_t { + + /** + * Public eap_ttls_avp_t interface. + */ + eap_ttls_avp_t public; + + /** + * AVP input buffer + */ + chunk_t input; + + /** + * Position in input buffer + */ + size_t inpos; + + /** + * process header (TRUE) or body (FALSE) + */ + bool process_header; + + /** + * Size of AVP data + */ + size_t data_len; +}; + +METHOD(eap_ttls_avp_t, build, void, + private_eap_ttls_avp_t *this, tls_writer_t *writer, chunk_t data) +{ + char zero_padding[] = { 0x00, 0x00, 0x00 }; + chunk_t avp_padding; + u_int8_t avp_flags; + u_int32_t avp_len; + + avp_flags = 0x40; + avp_len = 8 + data.len; + avp_padding = chunk_create(zero_padding, (4 - data.len) % 4); + + writer->write_uint32(writer, AVP_EAP_MESSAGE); + writer->write_uint8(writer, avp_flags); + writer->write_uint24(writer, avp_len); + writer->write_data(writer, data); + writer->write_data(writer, avp_padding); +} + +METHOD(eap_ttls_avp_t, process, status_t, + private_eap_ttls_avp_t* this, tls_reader_t *reader, chunk_t *data) +{ + size_t len; + chunk_t buf; + + if (this->process_header) + { + tls_reader_t *header; + u_int32_t avp_code; + u_int8_t avp_flags; + u_int32_t avp_len; + bool success; + + len = min(reader->remaining(reader), AVP_HEADER_LEN - this->inpos); + if (!reader->read_data(reader, len, &buf)) + { + return FAILED; + } + if (this->input.len == 0) + { + /* start of a new AVP header */ + this->input = chunk_alloc(AVP_HEADER_LEN); + memcpy(this->input.ptr, buf.ptr, len); + this->inpos = len; + } + else + { + memcpy(this->input.ptr + this->inpos, buf.ptr, len); + this->inpos += len; + } + + if (this->inpos < AVP_HEADER_LEN) + { + return NEED_MORE; + } + + /* parse AVP header */ + header = tls_reader_create(this->input); + success = header->read_uint32(header, &avp_code) && + header->read_uint8(header, &avp_flags) && + header->read_uint24(header, &avp_len); + header->destroy(header); + chunk_free(&this->input); + this->inpos = 0; + + if (!success) + { + DBG1(DBG_IKE, "received invalid AVP header"); + return FAILED; + } + if (avp_code != AVP_EAP_MESSAGE) + { + DBG1(DBG_IKE, "expected AVP_EAP_MESSAGE but received %u", avp_code); + return FAILED; + } + this->process_header = FALSE; + this->data_len = avp_len - 8; + this->input = chunk_alloc(this->data_len + (4 - avp_len) % 4); + } + + /* process AVP data */ + len = min(reader->remaining(reader), this->input.len - this->inpos); + if (!reader->read_data(reader, len, &buf)) + { + return FAILED; + } + memcpy(this->input.ptr + this->inpos, buf.ptr, len); + this->inpos += len; + if (this->inpos < this->input.len) + { + return NEED_MORE; + } + + *data = this->input; + data->len = this->data_len; + + /* preparing for next AVP */ + this->input = chunk_empty; + this->inpos = 0; + this->process_header = TRUE; + + return SUCCESS; +} + +METHOD(eap_ttls_avp_t, destroy, void, + private_eap_ttls_avp_t *this) +{ + chunk_free(&this->input); + free(this); +} + +/** + * See header + */ +eap_ttls_avp_t *eap_ttls_avp_create(void) +{ + private_eap_ttls_avp_t *this; + + INIT(this, + .public= { + .process = _process, + .build = _build, + .destroy = _destroy, + }, + .input = chunk_empty, + .inpos = 0, + .process_header = TRUE, + .data_len = 0, + ); + + return &this->public; +} diff --git a/src/libcharon/plugins/eap_ttls/eap_ttls_avp.h b/src/libcharon/plugins/eap_ttls/eap_ttls_avp.h new file mode 100644 index 000000000..cad1d9c56 --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/eap_ttls_avp.h @@ -0,0 +1,68 @@ +/* + * Copyright (C) 2010 Andreas Steffen + * Copyright (C) 2010 HSR 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 eap_ttls_avp eap_ttls_avp + * @{ @ingroup eap_ttls + */ + +#ifndef EAP_TTLS_AVP_H_ +#define EAP_TTLS_AVP_H_ + +typedef struct eap_ttls_avp_t eap_ttls_avp_t; + +#include <library.h> + +#include <tls_reader.h> +#include <tls_writer.h> + +/** + * EAP-TTLS Attribute-Value Pair (AVP) handler. + */ +struct eap_ttls_avp_t { + + /** + * Process received EAP-TTLS EAP Message AVP. + * + * @param reader TLS data buffer + * @param data received EAP Message + * @return + * - SUCCESS if AVP processing succeeded + * - FAILED if AVP processing failed + * - NEED_MORE if another invocation of process/build needed + */ + status_t (*process)(eap_ttls_avp_t *this, tls_reader_t *reader, + chunk_t *data); + + /** + * Build EAP-TTLS EAP Message AVP to send out. + * + * @param writer TLS data buffer to write to + * @param data EAP Message to send + */ + void (*build)(eap_ttls_avp_t *this, tls_writer_t *writer, chunk_t data); + + /** + * Destroy a eap_ttls_application_t. + */ + void (*destroy)(eap_ttls_avp_t *this); +}; + +/** + * Create an eap_ttls_avp instance. + */ +eap_ttls_avp_t *eap_ttls_avp_create(void); + +#endif /** EAP_TTLS_AVP_H_ @}*/ diff --git a/src/libcharon/plugins/eap_ttls/eap_ttls_peer.c b/src/libcharon/plugins/eap_ttls/eap_ttls_peer.c new file mode 100644 index 000000000..10d08ca2a --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/eap_ttls_peer.c @@ -0,0 +1,316 @@ +/* + * Copyright (C) 2010 Andreas Steffen + * Copyright (C) 2010 HSR 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 "eap_ttls_peer.h" +#include "eap_ttls_avp.h" + +#include <debug.h> +#include <daemon.h> + +#include <sa/authenticators/eap/eap_method.h> + +typedef struct private_eap_ttls_peer_t private_eap_ttls_peer_t; + +/** + * Private data of an eap_ttls_peer_t object. + */ +struct private_eap_ttls_peer_t { + + /** + * Public eap_ttls_peer_t interface. + */ + eap_ttls_peer_t public; + + /** + * Server identity + */ + identification_t *server; + + /** + * Peer identity + */ + identification_t *peer; + + /** + * Current EAP-TTLS state + */ + bool start_phase2; + + /** + * Current phase 2 EAP method + */ + eap_method_t *method; + + /** + * Pending outbound EAP message + */ + eap_payload_t *out; + + /** + * AVP handler + */ + eap_ttls_avp_t *avp; +}; + +/** + * EAP packet format + */ +typedef struct __attribute__((packed)) { + u_int8_t code; + u_int8_t identifier; + u_int16_t length; + u_int8_t type; + u_int8_t data; +} eap_packet_t; + +#define MAX_RADIUS_ATTRIBUTE_SIZE 253 + +METHOD(tls_application_t, process, status_t, + private_eap_ttls_peer_t *this, tls_reader_t *reader) +{ + chunk_t avp_data = chunk_empty; + chunk_t eap_data = chunk_empty; + status_t status; + payload_t *payload; + eap_payload_t *in; + eap_packet_t *pkt; + eap_code_t code; + eap_type_t type, received_type; + u_int32_t vendor, received_vendor; + u_int16_t eap_len; + size_t eap_pos = 0; + bool concatenated = FALSE; + + do + { + status = this->avp->process(this->avp, reader, &avp_data); + switch (status) + { + case SUCCESS: + break; + case NEED_MORE: + DBG1(DBG_IKE, "need more AVP data"); + return NEED_MORE; + case FAILED: + default: + return FAILED; + } + + if (eap_data.len == 0) + { + if (avp_data.len < 4) + { + DBG1(DBG_IKE, "AVP size to small to contain EAP header"); + chunk_free(&avp_data); + return FAILED; + } + pkt = (eap_packet_t*)avp_data.ptr; + eap_len = untoh16(&pkt->length); + + if (eap_len <= avp_data.len) + { + /* standard: EAP packet contained in a single AVP */ + eap_data = avp_data; + break; + } + else if (avp_data.len == MAX_RADIUS_ATTRIBUTE_SIZE) + { + /* non-standard: EAP packet segmented into multiple AVPs */ + eap_data = chunk_alloc(eap_len); + concatenated = TRUE; + } + else + { + DBG1(DBG_IKE, "non-radius segmentation of EAP packet into AVPs"); + chunk_free(&avp_data); + return FAILED; + } + } + + if (avp_data.len > eap_data.len - eap_pos) + { + DBG1(DBG_IKE, "AVP size to large to fit into EAP packet"); + chunk_free(&avp_data); + chunk_free(&eap_data); + return FAILED; + } + memcpy(eap_data.ptr + eap_pos, avp_data.ptr, avp_data.len); + eap_pos += avp_data.len; + chunk_free(&avp_data); + } + while (eap_pos < eap_data.len); + + in = eap_payload_create_data(eap_data); + chunk_free(&eap_data); + payload = (payload_t*)in; + + if (payload->verify(payload) != SUCCESS) + { + in->destroy(in); + return FAILED; + } + code = in->get_code(in); + received_type = in->get_type(in, &received_vendor); + DBG1(DBG_IKE, "received tunneled EAP-TTLS AVP%s [EAP/%N/%N]", + concatenated ? "s" : "", + eap_code_short_names, code, + eap_type_short_names, received_type); + if (code != EAP_REQUEST) + { + DBG1(DBG_IKE, "%N expected", eap_code_names, EAP_REQUEST); + in->destroy(in); + return FAILED; + } + + if (this->method == NULL) + { + if (received_vendor) + { + DBG1(DBG_IKE, "server requested vendor specific EAP method %d-%d", + received_type, received_vendor); + } + else + { + DBG1(DBG_IKE, "server requested %N authentication", + eap_type_names, received_type); + } + this->method = charon->eap->create_instance(charon->eap, + received_type, received_vendor, + EAP_PEER, this->server, this->peer); + if (!this->method) + { + DBG1(DBG_IKE, "EAP method not supported"); + this->out = eap_payload_create_nak(in->get_identifier(in)); + in->destroy(in); + return NEED_MORE; + } + } + + type = this->method->get_type(this->method, &vendor); + + if (type != received_type || vendor != received_vendor) + { + DBG1(DBG_IKE, "received invalid EAP request"); + in->destroy(in); + return FAILED; + } + + status = this->method->process(this->method, in, &this->out); + in->destroy(in); + + switch (status) + { + case SUCCESS: + this->method->destroy(this->method); + this->method = NULL; + return NEED_MORE; + case NEED_MORE: + if (type != EAP_TNC) + { + this->method->destroy(this->method); + this->method = NULL; + } + return NEED_MORE; + case FAILED: + default: + if (vendor) + { + DBG1(DBG_IKE, "vendor specific EAP method %d-%d failed", + type, vendor); + } + else + { + DBG1(DBG_IKE, "%N method failed", eap_type_names, type); + } + return FAILED; + } +} + +METHOD(tls_application_t, build, status_t, + private_eap_ttls_peer_t *this, tls_writer_t *writer) +{ + chunk_t data; + eap_code_t code; + eap_type_t type; + u_int32_t vendor; + + if (this->method == NULL && this->start_phase2) + { + /* generate an EAP Identity response */ + this->method = charon->eap->create_instance(charon->eap, EAP_IDENTITY, + 0, EAP_PEER, this->server, this->peer); + if (this->method == NULL) + { + DBG1(DBG_IKE, "EAP_IDENTITY method not available"); + return FAILED; + } + this->method->process(this->method, NULL, &this->out); + this->method->destroy(this->method); + this->method = NULL; + this->start_phase2 = FALSE; + } + + if (this->out) + { + code = this->out->get_code(this->out); + type = this->out->get_type(this->out, &vendor); + DBG1(DBG_IKE, "sending tunneled EAP-TTLS AVP [EAP/%N/%N]", + eap_code_short_names, code, eap_type_short_names, type); + + /* get the raw EAP message data */ + data = this->out->get_data(this->out); + this->avp->build(this->avp, writer, data); + + this->out->destroy(this->out); + this->out = NULL; + } + return INVALID_STATE; +} + +METHOD(tls_application_t, destroy, void, + private_eap_ttls_peer_t *this) +{ + this->server->destroy(this->server); + this->peer->destroy(this->peer); + DESTROY_IF(this->method); + DESTROY_IF(this->out); + this->avp->destroy(this->avp); + free(this); +} + +/** + * See header + */ +eap_ttls_peer_t *eap_ttls_peer_create(identification_t *server, + identification_t *peer) +{ + private_eap_ttls_peer_t *this; + + INIT(this, + .public = { + .application = { + .process = _process, + .build = _build, + .destroy = _destroy, + }, + }, + .server = server->clone(server), + .peer = peer->clone(peer), + .start_phase2 = TRUE, + .avp = eap_ttls_avp_create(), + ); + + return &this->public; +} diff --git a/src/libcharon/plugins/eap_ttls/eap_ttls_peer.h b/src/libcharon/plugins/eap_ttls/eap_ttls_peer.h new file mode 100644 index 000000000..31fc0d9db --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/eap_ttls_peer.h @@ -0,0 +1,47 @@ +/* + * Copyright (C) 2010 Andreas Steffen + * Copyright (C) 2010 HSR 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 eap_ttls_peer eap_ttls_peer + * @{ @ingroup eap_ttls + */ + +#ifndef EAP_TTLS_PEER_H_ +#define EAP_TTLS_PEER_H_ + +typedef struct eap_ttls_peer_t eap_ttls_peer_t; + +#include "tls_application.h" + +#include <library.h> + +/** + * TLS application data handler as peer. + */ +struct eap_ttls_peer_t { + + /** + * Implements the TLS application data handler. + */ + tls_application_t application; +}; + +/** + * Create an eap_ttls_peer instance. + */ +eap_ttls_peer_t *eap_ttls_peer_create(identification_t *server, + identification_t *peer); + +#endif /** EAP_TTLS_PEER_H_ @}*/ diff --git a/src/libcharon/plugins/eap_ttls/eap_ttls_plugin.c b/src/libcharon/plugins/eap_ttls/eap_ttls_plugin.c new file mode 100644 index 000000000..48e759dcc --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/eap_ttls_plugin.c @@ -0,0 +1,52 @@ +/* + * Copyright (C) 2010 Andreas Steffen + * Copyright (C) 2010 HSR 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 "eap_ttls_plugin.h" + +#include "eap_ttls.h" + +#include <daemon.h> + + +METHOD(plugin_t, destroy, void, + eap_ttls_plugin_t *this) +{ + charon->eap->remove_method(charon->eap, + (eap_constructor_t)eap_ttls_create_server); + charon->eap->remove_method(charon->eap, + (eap_constructor_t)eap_ttls_create_peer); + free(this); +} + +/* + * see header file + */ +plugin_t *eap_ttls_plugin_create() +{ + eap_ttls_plugin_t *this; + + INIT(this, + .plugin = { + .destroy = _destroy, + }, + ); + + charon->eap->add_method(charon->eap, EAP_TTLS, 0, EAP_SERVER, + (eap_constructor_t)eap_ttls_create_server); + charon->eap->add_method(charon->eap, EAP_TTLS, 0, EAP_PEER, + (eap_constructor_t)eap_ttls_create_peer); + + return &this->plugin; +} diff --git a/src/libcharon/plugins/eap_ttls/eap_ttls_plugin.h b/src/libcharon/plugins/eap_ttls/eap_ttls_plugin.h new file mode 100644 index 000000000..2abc82931 --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/eap_ttls_plugin.h @@ -0,0 +1,47 @@ +/* + * Copyright (C) 2010 Andreas Steffen + * Copyright (C) 2010 HSR 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 eap_ttls eap_ttls + * @ingroup cplugins + * + * @defgroup eap_ttls_plugin eap_ttls_plugin + * @{ @ingroup eap_ttls + */ + +#ifndef EAP_TTLS_PLUGIN_H_ +#define EAP_TTLS_PLUGIN_H_ + +#include <plugins/plugin.h> + +typedef struct eap_ttls_plugin_t eap_ttls_plugin_t; + +/** + * EAP-TTLS plugin + */ +struct eap_ttls_plugin_t { + + /** + * implements plugin interface + */ + plugin_t plugin; +}; + +/** + * Create a eap_ttls_plugin instance. + */ +plugin_t *eap_ttls_plugin_create(); + +#endif /** EAP_TTLS_PLUGIN_H_ @}*/ diff --git a/src/libcharon/plugins/eap_ttls/eap_ttls_server.c b/src/libcharon/plugins/eap_ttls/eap_ttls_server.c new file mode 100644 index 000000000..835cd7306 --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/eap_ttls_server.c @@ -0,0 +1,365 @@ +/* + * Copyright (C) 2010 Andreas Steffen + * Copyright (C) 2010 HSR 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 "eap_ttls_server.h" +#include "eap_ttls_avp.h" + +#include <debug.h> +#include <daemon.h> + +#include <sa/authenticators/eap/eap_method.h> + +typedef struct private_eap_ttls_server_t private_eap_ttls_server_t; + +/** + * Private data of an eap_ttls_server_t object. + */ +struct private_eap_ttls_server_t { + + /** + * Public eap_ttls_server_t interface. + */ + eap_ttls_server_t public; + + /** + * Server identity + */ + identification_t *server; + + /** + * Peer identity + */ + identification_t *peer; + + /** + * Current EAP-TTLS phase2 state + */ + bool start_phase2; + + /** + * Current EAP-TTLS phase2 TNC state + */ + bool start_phase2_tnc; + + /** + * Current phase 2 EAP method + */ + eap_method_t *method; + + /** + * Pending outbound EAP message + */ + eap_payload_t *out; + + /** + * AVP handler + */ + eap_ttls_avp_t *avp; +}; + +/** + * Start EAP client authentication protocol + */ +static status_t start_phase2_auth(private_eap_ttls_server_t *this) +{ + char *eap_type_str; + eap_type_t type; + + eap_type_str = lib->settings->get_str(lib->settings, + "charon.plugins.eap-ttls.phase2_method", "md5"); + type = eap_type_from_string(eap_type_str); + if (type == 0) + { + DBG1(DBG_IKE, "unrecognized phase2 method \"%s\"", eap_type_str); + return FAILED; + } + DBG1(DBG_IKE, "phase2 method %N selected", eap_type_names, type); + this->method = charon->eap->create_instance(charon->eap, type, 0, + EAP_SERVER, this->server, this->peer); + if (this->method == NULL) + { + DBG1(DBG_IKE, "%N method not available", eap_type_names, type); + return FAILED; + } + if (this->method->initiate(this->method, &this->out) == NEED_MORE) + { + return NEED_MORE; + } + else + { + DBG1(DBG_IKE, "%N method failed", eap_type_names, type); + return FAILED; + } +} + +/** + * If configured, start EAP-TNC protocol + */ +static status_t start_phase2_tnc(private_eap_ttls_server_t *this) +{ + if (this->start_phase2_tnc && lib->settings->get_bool(lib->settings, + "charon.plugins.eap-ttls.phase2_tnc", FALSE)) + { + DBG1(DBG_IKE, "phase2 method %N selected", eap_type_names, EAP_TNC); + this->method = charon->eap->create_instance(charon->eap, EAP_TNC, + 0, EAP_SERVER, this->server, this->peer); + if (this->method == NULL) + { + DBG1(DBG_IKE, "%N method not available", eap_type_names, EAP_TNC); + return FAILED; + } + this->start_phase2_tnc = FALSE; + if (this->method->initiate(this->method, &this->out) == NEED_MORE) + { + return NEED_MORE; + } + else + { + DBG1(DBG_IKE, "%N method failed", eap_type_names, EAP_TNC); + return FAILED; + } + } + return SUCCESS; +} + +METHOD(tls_application_t, process, status_t, + private_eap_ttls_server_t *this, tls_reader_t *reader) +{ + chunk_t data = chunk_empty; + status_t status; + payload_t *payload; + eap_payload_t *in; + eap_code_t code; + eap_type_t type = EAP_NAK, received_type; + u_int32_t vendor, received_vendor; + + status = this->avp->process(this->avp, reader, &data); + switch (status) + { + case SUCCESS: + break; + case NEED_MORE: + return NEED_MORE; + case FAILED: + default: + return FAILED; + } + in = eap_payload_create_data(data); + chunk_free(&data); + payload = (payload_t*)in; + + if (payload->verify(payload) != SUCCESS) + { + in->destroy(in); + return FAILED; + } + code = in->get_code(in); + received_type = in->get_type(in, &received_vendor); + DBG1(DBG_IKE, "received tunneled EAP-TTLS AVP [EAP/%N/%N]", + eap_code_short_names, code, + eap_type_short_names, received_type); + if (code != EAP_RESPONSE) + { + DBG1(DBG_IKE, "%N expected", eap_code_names, EAP_RESPONSE); + in->destroy(in); + return FAILED; + } + + if (this->method) + { + type = this->method->get_type(this->method, &vendor); + + if (type != received_type || vendor != received_vendor) + { + if (received_vendor == 0 && received_type == EAP_NAK) + { + DBG1(DBG_IKE, "peer does not support %N", eap_type_names, type); + } + else + { + DBG1(DBG_IKE, "received invalid EAP response"); + } + in->destroy(in); + return FAILED; + } + } + + if (!received_vendor && received_type == EAP_IDENTITY) + { + chunk_t eap_id; + + if (this->method == NULL) + { + /* Received an EAP Identity response without a matching request */ + this->method = charon->eap->create_instance(charon->eap, + EAP_IDENTITY, 0, EAP_SERVER, + this->server, this->peer); + if (this->method == NULL) + { + DBG1(DBG_IKE, "%N method not available", + eap_type_names, EAP_IDENTITY); + return FAILED; + } + } + + if (this->method->process(this->method, in, &this->out) != SUCCESS) + { + + DBG1(DBG_IKE, "%N method failed", eap_type_names, EAP_IDENTITY); + return FAILED; + } + + if (this->method->get_msk(this->method, &eap_id) == SUCCESS) + { + this->peer->destroy(this->peer); + this->peer = identification_create_from_data(eap_id); + DBG1(DBG_IKE, "received EAP identity '%Y'", this->peer); + } + + in->destroy(in); + this->method->destroy(this->method); + this->method = NULL; + + /* Start Phase 2 of EAP-TTLS authentication */ + if (lib->settings->get_bool(lib->settings, + "charon.plugins.eap-ttls.request_peer_auth", FALSE)) + { + return start_phase2_tnc(this); + } + else + { + return start_phase2_auth(this); + } + } + + if (this->method == 0) + { + DBG1(DBG_IKE, "no %N phase2 method installed", eap_type_names, EAP_TTLS); + in->destroy(in); + return FAILED; + } + + status = this->method->process(this->method, in, &this->out); + in->destroy(in); + + switch (status) + { + case SUCCESS: + DBG1(DBG_IKE, "%N phase2 authentication of '%Y' with %N successful", + eap_type_names, EAP_TTLS, this->peer, + eap_type_names, type); + this->method->destroy(this->method); + this->method = NULL; + + /* continue phase2 with EAP-TNC? */ + return start_phase2_tnc(this); + case NEED_MORE: + break; + case FAILED: + default: + if (vendor) + { + DBG1(DBG_IKE, "vendor specific EAP method %d-%d failed", + type, vendor); + } + else + { + DBG1(DBG_IKE, "%N method failed", eap_type_names, type); + } + return FAILED; + } + return status; +} + +METHOD(tls_application_t, build, status_t, + private_eap_ttls_server_t *this, tls_writer_t *writer) +{ + chunk_t data; + eap_code_t code; + eap_type_t type; + u_int32_t vendor; + + if (this->method == NULL && this->start_phase2 && + lib->settings->get_bool(lib->settings, + "charon.plugins.eap-ttls.phase2_piggyback", FALSE)) + { + /* generate an EAP Identity request which will be piggybacked right + * onto the TLS Finished message thus initiating EAP-TTLS phase2 + */ + this->method = charon->eap->create_instance(charon->eap, EAP_IDENTITY, + 0, EAP_SERVER, this->server, this->peer); + if (this->method == NULL) + { + DBG1(DBG_IKE, "%N method not available", + eap_type_names, EAP_IDENTITY); + return FAILED; + } + this->method->initiate(this->method, &this->out); + this->start_phase2 = FALSE; + } + + if (this->out) + { + code = this->out->get_code(this->out); + type = this->out->get_type(this->out, &vendor); + DBG1(DBG_IKE, "sending tunneled EAP-TTLS AVP [EAP/%N/%N]", + eap_code_short_names, code, eap_type_short_names, type); + + /* get the raw EAP message data */ + data = this->out->get_data(this->out); + this->avp->build(this->avp, writer, data); + + this->out->destroy(this->out); + this->out = NULL; + } + return INVALID_STATE; +} + +METHOD(tls_application_t, destroy, void, + private_eap_ttls_server_t *this) +{ + this->server->destroy(this->server); + this->peer->destroy(this->peer); + DESTROY_IF(this->method); + DESTROY_IF(this->out); + this->avp->destroy(this->avp); + free(this); +} + +/** + * See header + */ +eap_ttls_server_t *eap_ttls_server_create(identification_t *server, + identification_t *peer) +{ + private_eap_ttls_server_t *this; + + INIT(this, + .public = { + .application = { + .process = _process, + .build = _build, + .destroy = _destroy, + }, + }, + .server = server->clone(server), + .peer = peer->clone(peer), + .start_phase2 = TRUE, + .start_phase2_tnc = TRUE, + .avp = eap_ttls_avp_create(), + ); + + return &this->public; +} diff --git a/src/libcharon/plugins/eap_ttls/eap_ttls_server.h b/src/libcharon/plugins/eap_ttls/eap_ttls_server.h new file mode 100644 index 000000000..a66a813ec --- /dev/null +++ b/src/libcharon/plugins/eap_ttls/eap_ttls_server.h @@ -0,0 +1,47 @@ +/* + * Copyright (C) 2010 Andreas Steffen + * Copyright (C) 2010 HSR 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 eap_ttls_server eap_ttls_server + * @{ @ingroup eap_ttls + */ + +#ifndef EAP_TTLS_SERVER_H_ +#define EAP_TTLS_SERVER_H_ + +typedef struct eap_ttls_server_t eap_ttls_server_t; + +#include "tls_application.h" + +#include <library.h> + +/** + * TLS application data handler as server. + */ +struct eap_ttls_server_t { + + /** + * Implements the TLS application data handler. + */ + tls_application_t application; +}; + +/** + * Create an eap_ttls_server instance. + */ +eap_ttls_server_t *eap_ttls_server_create(identification_t *server, + identification_t *peer); + +#endif /** EAP_TTLS_SERVER_H_ @}*/ |