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Diffstat (limited to 'src/charon/encoding/payloads/eap_payload.c')
-rw-r--r--src/charon/encoding/payloads/eap_payload.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/src/charon/encoding/payloads/eap_payload.c b/src/charon/encoding/payloads/eap_payload.c
new file mode 100644
index 000000000..79ab32fe5
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+++ b/src/charon/encoding/payloads/eap_payload.c
@@ -0,0 +1,331 @@
+/**
+ * @file eap_payload.c
+ *
+ * @brief Implementation of eap_payload_t.
+ *
+ */
+
+/*
+ * Copyright (C) 2005-2006 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.
+ *
+ */
+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...
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
+*/
+
+/**
+ * Implementation of payload_t.verify.
+ */
+static status_t verify(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;
+ }
+ code = *this->data.ptr;
+ length = htons(*(u_int16_t*)(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;
+ }
+ 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;
+}
+
+/**
+ * Implementation of eap_payload_t.get_encoding_rules.
+ */
+static void get_encoding_rules(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);
+}
+
+/**
+ * Implementation of payload_t.get_type.
+ */
+static payload_type_t get_payload_type(private_eap_payload_t *this)
+{
+ return EXTENSIBLE_AUTHENTICATION;
+}
+
+/**
+ * Implementation of payload_t.get_next_type.
+ */
+static payload_type_t get_next_type(private_eap_payload_t *this)
+{
+ return (this->next_payload);
+}
+
+/**
+ * Implementation of payload_t.set_next_type.
+ */
+static void set_next_type(private_eap_payload_t *this,payload_type_t type)
+{
+ this->next_payload = type;
+}
+
+/**
+ * Implementation of payload_t.get_length.
+ */
+static size_t get_length(private_eap_payload_t *this)
+{
+ return this->payload_length;
+}
+
+/**
+ * Implementation of eap_payload_t.get_data.
+ */
+static chunk_t get_data(private_eap_payload_t *this)
+{
+ return this->data;
+}
+
+/**
+ * Implementation of eap_payload_t.set_data.
+ */
+static void set_data(private_eap_payload_t *this, chunk_t data)
+{
+ chunk_free(&this->data);
+ this->data = chunk_clone(data);
+ this->payload_length = this->data.len + 4;
+}
+
+/**
+ * Implementation of eap_payload_t.get_code.
+ */
+static eap_code_t get_code(private_eap_payload_t *this)
+{
+ if (this->data.len > 0)
+ {
+ return *this->data.ptr;
+ }
+ /* should not happen, as it is verified */
+ return 0;
+}
+
+/**
+ * Implementation of eap_payload_t.get_identifier.
+ */
+static u_int8_t get_identifier(private_eap_payload_t *this)
+{
+ if (this->data.len > 1)
+ {
+ return *(this->data.ptr + 1);
+ }
+ /* should not happen, as it is verified */
+ return 0;
+}
+
+/**
+ * Implementation of eap_payload_t.get_type.
+ */
+static eap_type_t get_type(private_eap_payload_t *this)
+{
+ if (this->data.len > 4)
+ {
+ return *(this->data.ptr + 4);
+ }
+ return 0;
+}
+
+/**
+ * Implementation of payload_t.destroy and eap_payload_t.destroy.
+ */
+static void destroy(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 = malloc_thing(private_eap_payload_t);
+
+ /* interface functions */
+ this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
+ this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
+ this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
+ this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
+ this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;
+ this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_payload_type;
+ this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
+
+ /* public functions */
+ this->public.destroy = (void (*) (eap_payload_t *)) destroy;
+ this->public.get_data = (chunk_t (*) (eap_payload_t*))get_data;
+ this->public.set_data = (void (*) (eap_payload_t *,chunk_t))set_data;
+ this->public.get_code = (eap_code_t (*) (eap_payload_t*))get_code;
+ this->public.get_identifier = (u_int8_t (*) (eap_payload_t*))get_identifier;
+ this->public.get_type = (eap_type_t (*) (eap_payload_t*))get_type;
+
+ /* private variables */
+ this->critical = FALSE;
+ this->next_payload = NO_PAYLOAD;
+ this->payload_length = EAP_PAYLOAD_HEADER_LENGTH;
+ this->data = chunk_empty;
+
+ 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)
+{
+ eap_payload_t *this = eap_payload_create();
+ chunk_t data = chunk_alloca(4);
+
+ *(data.ptr + 0) = code;
+ *(data.ptr + 1) = 0;
+ *(u_int16_t*)(data.ptr + 2) = htons(data.len);
+
+ this->set_data(this, data);
+ return this;
+}
+
+/*
+ * Described in header
+ */
+eap_payload_t *eap_payload_create_nak()
+{
+ eap_payload_t *this = eap_payload_create();
+ chunk_t data = chunk_alloca(5);
+
+ *(data.ptr + 0) = EAP_RESPONSE;
+ *(data.ptr + 1) = 0;
+ *(u_int16_t*)(data.ptr + 2) = htons(data.len);
+ *(data.ptr + 4) = EAP_NAK;
+
+ this->set_data(this, data);
+ return this;
+}
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