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-rw-r--r--src/libcharon/encoding/payloads/eap_payload.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/src/libcharon/encoding/payloads/eap_payload.c b/src/libcharon/encoding/payloads/eap_payload.c
new file mode 100644
index 000000000..21f34a642
--- /dev/null
+++ b/src/libcharon/encoding/payloads/eap_payload.c
@@ -0,0 +1,302 @@
+/*
+ * Copyright (C) 2005-2010 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * 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 <stddef.h>
+
+#include "eap_payload.h"
+
+#include <daemon.h>
+
+typedef struct private_eap_payload_t private_eap_payload_t;
+
+/**
+ * Private data of an eap_payload_t object.
+ *
+ */
+struct private_eap_payload_t {
+ /**
+ * Public eap_payload_t interface.
+ */
+ eap_payload_t public;
+
+ /**
+ * Next payload type.
+ */
+ u_int8_t next_payload;
+
+ /**
+ * Critical flag.
+ */
+ bool critical;
+
+ /**
+ * Length of this payload.
+ */
+ u_int16_t payload_length;
+
+ /**
+ * EAP message data, if available
+ */
+ chunk_t data;
+};
+
+/**
+ * Encoding rules to parse or generate a EAP payload.
+ *
+ * The defined offsets are the positions in a object of type
+ * private_eap_payload_t.
+ *
+ */
+static encoding_rule_t eap_payload_encodings[] = {
+ /* 1 Byte next payload type, stored in the field next_payload */
+ { U_INT_8, offsetof(private_eap_payload_t, next_payload) },
+ /* the critical bit */
+ { FLAG, offsetof(private_eap_payload_t, critical) },
+ /* 7 Bit reserved bits, nowhere stored */
+ { RESERVED_BIT, 0 },
+ { RESERVED_BIT, 0 },
+ { RESERVED_BIT, 0 },
+ { RESERVED_BIT, 0 },
+ { RESERVED_BIT, 0 },
+ { RESERVED_BIT, 0 },
+ { RESERVED_BIT, 0 },
+ /* Length of the whole payload*/
+ { PAYLOAD_LENGTH, offsetof(private_eap_payload_t, payload_length) },
+ /* chunt to data, starting at "code" */
+ { EAP_DATA, offsetof(private_eap_payload_t, data) },
+};
+
+/*
+ 1 2 3
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Next Payload !C! RESERVED ! Payload Length !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Code ! Identifier ! Length !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Type ! Type_Data...
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
+*/
+
+METHOD(payload_t, verify, status_t,
+ private_eap_payload_t *this)
+{
+ u_int16_t length;
+ u_int8_t code;
+
+ if (this->data.len < 4)
+ {
+ DBG1(DBG_ENC, "EAP payloads EAP message too short (%d)", this->data.len);
+ return FAILED;
+ }
+ length = untoh16(this->data.ptr + 2);
+ if (this->data.len != length)
+ {
+ DBG1(DBG_ENC, "EAP payload length (%d) does not match contained "
+ "message length (%d)", this->data.len, length);
+ return FAILED;
+ }
+ code = this->data.ptr[0];
+ switch (code)
+ {
+ case EAP_REQUEST:
+ case EAP_RESPONSE:
+ {
+ if (this->data.len < 4)
+ {
+ DBG1(DBG_ENC, "EAP Request/Response does not have any data");
+ return FAILED;
+ }
+ break;
+ }
+ case EAP_SUCCESS:
+ case EAP_FAILURE:
+ {
+ if (this->data.len != 4)
+ {
+ DBG1(DBG_ENC, "EAP Success/Failure has data");
+ return FAILED;
+ }
+ break;
+ }
+ default:
+ return FAILED;
+ }
+ return SUCCESS;
+}
+
+METHOD(payload_t, get_encoding_rules, void,
+ private_eap_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
+{
+ *rules = eap_payload_encodings;
+ *rule_count = sizeof(eap_payload_encodings) / sizeof(encoding_rule_t);
+}
+
+METHOD(payload_t, get_payload_type, payload_type_t,
+ private_eap_payload_t *this)
+{
+ return EXTENSIBLE_AUTHENTICATION;
+}
+
+METHOD(payload_t, get_next_type, payload_type_t,
+ private_eap_payload_t *this)
+{
+ return (this->next_payload);
+}
+
+METHOD(payload_t, set_next_type, void,
+ private_eap_payload_t *this, payload_type_t type)
+{
+ this->next_payload = type;
+}
+
+METHOD(payload_t, get_length, size_t,
+ private_eap_payload_t *this)
+{
+ return this->payload_length;
+}
+
+METHOD(eap_payload_t, get_data, chunk_t,
+ private_eap_payload_t *this)
+{
+ return this->data;
+}
+
+METHOD(eap_payload_t, set_data, void,
+ private_eap_payload_t *this, chunk_t data)
+{
+ free(this->data.ptr);
+ this->data = chunk_clone(data);
+ this->payload_length = this->data.len + 4;
+}
+
+METHOD(eap_payload_t, get_code, eap_code_t,
+ private_eap_payload_t *this)
+{
+ if (this->data.len > 0)
+ {
+ return this->data.ptr[0];
+ }
+ /* should not happen, as it is verified */
+ return 0;
+}
+
+METHOD(eap_payload_t, get_identifier, u_int8_t,
+ private_eap_payload_t *this)
+{
+ if (this->data.len > 1)
+ {
+ return this->data.ptr[1];
+ }
+ /* should not happen, as it is verified */
+ return 0;
+}
+
+METHOD(eap_payload_t, get_type, eap_type_t,
+ private_eap_payload_t *this, u_int32_t *vendor)
+{
+ eap_type_t type;
+
+ *vendor = 0;
+ if (this->data.len > 4)
+ {
+ type = this->data.ptr[4];
+ if (type != EAP_EXPANDED)
+ {
+ return type;
+ }
+ if (this->data.len >= 12)
+ {
+ *vendor = untoh32(this->data.ptr + 4) & 0x00FFFFFF;
+ return untoh32(this->data.ptr + 8);
+ }
+ }
+ return 0;
+}
+
+METHOD2(payload_t, eap_payload_t, destroy, void,
+ private_eap_payload_t *this)
+{
+ chunk_free(&this->data);
+ free(this);
+}
+
+/*
+ * Described in header
+ */
+eap_payload_t *eap_payload_create()
+{
+ private_eap_payload_t *this;
+
+ INIT(this,
+ .public = {
+ .payload_interface = {
+ .verify = _verify,
+ .get_encoding_rules = _get_encoding_rules,
+ .get_length = _get_length,
+ .get_next_type = _get_next_type,
+ .set_next_type = _set_next_type,
+ .get_type = _get_payload_type,
+ .destroy = _destroy,
+ },
+ .get_data = _get_data,
+ .set_data = _set_data,
+ .get_code = _get_code,
+ .get_identifier = _get_identifier,
+ .get_type = _get_type,
+ .destroy = _destroy,
+ },
+ .next_payload = NO_PAYLOAD,
+ .payload_length = EAP_PAYLOAD_HEADER_LENGTH,
+ );
+ return &this->public;
+}
+
+/*
+ * Described in header
+ */
+eap_payload_t *eap_payload_create_data(chunk_t data)
+{
+ eap_payload_t *this = eap_payload_create();
+
+ this->set_data(this, data);
+ return this;
+}
+
+/*
+ * Described in header
+ */
+eap_payload_t *eap_payload_create_code(eap_code_t code, u_int8_t identifier)
+{
+ chunk_t data;
+
+ data = chunk_from_chars(code, identifier, 0, 0);
+ htoun16(data.ptr + 2, data.len);
+ return eap_payload_create_data(data);
+}
+
+/*
+ * Described in header
+ */
+eap_payload_t *eap_payload_create_nak(u_int8_t identifier)
+{
+ chunk_t data;
+
+ data = chunk_from_chars(EAP_RESPONSE, identifier, 0, 0, EAP_NAK);
+ htoun16(data.ptr + 2, data.len);
+ return eap_payload_create_data(data);
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-23 22:37:09 +0000