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-rw-r--r--Source/charon/encoding/payloads/ke_payload.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/Source/charon/encoding/payloads/ke_payload.c b/Source/charon/encoding/payloads/ke_payload.c
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+++ b/Source/charon/encoding/payloads/ke_payload.c
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+/**
+ * @file ke_payload.c
+ *
+ * @brief Declaration of the class ke_payload_t.
+ *
+ * An object of this type represents an IKEv2 KE-Payload.
+ *
+ * See section 3.4 of RFC for details of this payload type.
+ *
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, 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.
+ */
+
+/* offsetof macro */
+#include <stddef.h>
+
+#include "ke_payload.h"
+
+#include <encoding/payloads/encodings.h>
+#include <utils/allocator.h>
+
+
+/**
+ * Private data of an ke_payload_t Object
+ *
+ */
+typedef struct private_ke_payload_s private_ke_payload_t;
+
+struct private_ke_payload_s {
+ /**
+ * public ke_payload_t interface
+ */
+ ke_payload_t public;
+
+ /**
+ * next payload type
+ */
+ u_int8_t next_payload;
+
+ /**
+ * Critical flag
+ */
+ bool critical;
+
+ /**
+ * Length of this payload
+ */
+ u_int16_t payload_length;
+
+
+ /**
+ * DH Group Number
+ */
+ diffie_hellman_group_t dh_group_number;
+
+ /**
+ * Key Exchange Data of this KE payload
+ */
+ chunk_t key_exchange_data;
+
+ /**
+ * @brief Computes the length of this payload.
+ *
+ * @param this calling private_ke_payload_t object
+ * @return
+ * SUCCESS in any case
+ */
+ status_t (*compute_length) (private_ke_payload_t *this);
+};
+
+/**
+ * Encoding rules to parse or generate a IKEv2-KE Payload
+ *
+ * The defined offsets are the positions in a object of type
+ * private_ke_payload_t.
+ *
+ */
+encoding_rule_t ke_payload_encodings[] = {
+ /* 1 Byte next payload type, stored in the field next_payload */
+ { U_INT_8, offsetof(private_ke_payload_t, next_payload) },
+ /* the critical bit */
+ { FLAG, offsetof(private_ke_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_ke_payload_t, payload_length) },
+ /* DH Group number as 16 bit field*/
+ { U_INT_16, offsetof(private_ke_payload_t, dh_group_number) },
+ { RESERVED_BYTE, 0 },
+ { RESERVED_BYTE, 0 },
+ /* Key Exchange Data is from variable size */
+ { KEY_EXCHANGE_DATA, offsetof(private_ke_payload_t, key_exchange_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 !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! DH Group # ! RESERVED !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! !
+ ~ Key Exchange Data ~
+ ! !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+/**
+ * Implements payload_t's verify function.
+ * See #payload_s.verify for description.
+ */
+static status_t verify(private_ke_payload_t *this)
+{
+ if (this->critical)
+ {
+ /* critical bit is set! */
+ return FAILED;
+ }
+
+ /* dh group is not verified in here */
+ return SUCCESS;
+}
+
+/**
+ * Implements payload_t's and ke_payload_t's destroy function.
+ * See #payload_s.destroy or ke_payload_s.destroy for description.
+ */
+static status_t destroy(private_ke_payload_t *this)
+{
+ if (this->key_exchange_data.ptr != NULL)
+ {
+ allocator_free(this->key_exchange_data.ptr);
+ }
+ allocator_free(this);
+ return SUCCESS;
+}
+
+/**
+ * Implements payload_t's get_encoding_rules function.
+ * See #payload_s.get_encoding_rules for description.
+ */
+static status_t get_encoding_rules(private_ke_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
+{
+ *rules = ke_payload_encodings;
+ *rule_count = sizeof(ke_payload_encodings) / sizeof(encoding_rule_t);
+
+ return SUCCESS;
+}
+
+/**
+ * Implements payload_t's get_type function.
+ * See #payload_s.get_type for description.
+ */
+static payload_type_t get_type(private_ke_payload_t *this)
+{
+ return KEY_EXCHANGE;
+}
+
+/**
+ * Implements payload_t's get_next_type function.
+ * See #payload_s.get_next_type for description.
+ */
+static payload_type_t get_next_type(private_ke_payload_t *this)
+{
+ return (this->next_payload);
+}
+
+/**
+ * Implements payload_t's set_next_type function.
+ * See #payload_s.set_next_type for description.
+ */
+static status_t set_next_type(private_ke_payload_t *this,payload_type_t type)
+{
+ this->next_payload = type;
+ return SUCCESS;
+}
+
+/**
+ * Implements payload_t's get_length function.
+ * See #payload_s.get_length for description.
+ */
+static size_t get_length(private_ke_payload_t *this)
+{
+ this->compute_length(this);
+ return this->payload_length;
+}
+
+/**
+ * Implements private_ke_payload_t's compute_length function.
+ * See #private_ke_payload_s.compute_length for description.
+ */
+static status_t compute_length (private_ke_payload_t *this)
+{
+ size_t length = KE_PAYLOAD_HEADER_LENGTH;
+ if (this->key_exchange_data.ptr != NULL)
+ {
+ length += this->key_exchange_data.len;
+ }
+
+ this->payload_length = length;
+
+ return SUCCESS;
+}
+
+
+/**
+ * Implements ke_payload_t's get_key_exchange_data function.
+ * See #ke_payload_t.get_key_exchange_data for description.
+ */
+chunk_t get_key_exchange_data(private_ke_payload_t *this)
+{
+ return (this->key_exchange_data);
+}
+
+/**
+ * Implements ke_payload_t's set_key_exchange_data function.
+ * See #ke_payload_t.set_key_exchange_data for description.
+ */
+status_t set_key_exchange_data(private_ke_payload_t *this, chunk_t key_exchange_data)
+{
+ /* destroy existing data first */
+ if (this->key_exchange_data.ptr != NULL)
+ {
+ /* free existing value */
+ allocator_free(this->key_exchange_data.ptr);
+ this->key_exchange_data.ptr = NULL;
+ this->key_exchange_data.len = 0;
+
+ }
+
+ this->key_exchange_data.ptr = allocator_clone_bytes(key_exchange_data.ptr,key_exchange_data.len);
+ if (this->key_exchange_data.ptr == NULL)
+ {
+ return OUT_OF_RES;
+ }
+ this->key_exchange_data.len = key_exchange_data.len;
+ this->compute_length(this);
+
+ return SUCCESS;
+}
+
+/**
+ * Implements ke_payload_t's get_dh_group_number function.
+ * See #ke_payload_t.get_dh_group_number for description.
+ */
+diffie_hellman_group_t get_dh_group_number(private_ke_payload_t *this)
+{
+ return this->dh_group_number;
+}
+
+/**
+ * Implements ke_payload_t's set_dh_group_number function.
+ * See #ke_payload_t.set_dh_group_number for description.
+ */
+status_t set_dh_group_number(private_ke_payload_t *this, diffie_hellman_group_t dh_group_number)
+{
+ this->dh_group_number = dh_group_number;
+ return SUCCESS;
+}
+
+/*
+ * Described in header
+ */
+ke_payload_t *ke_payload_create()
+{
+ private_ke_payload_t *this = allocator_alloc_thing(private_ke_payload_t);
+ if (this == NULL)
+ {
+ return NULL;
+ }
+ /* interface functions */
+ this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
+ this->public.payload_interface.get_encoding_rules = (status_t (*) (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 = (status_t (*) (payload_t *,payload_type_t)) set_next_type;
+ this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
+ this->public.payload_interface.destroy = (status_t (*) (payload_t *))destroy;
+
+ /* public functions */
+ this->public.get_key_exchange_data = (chunk_t (*) (ke_payload_t *)) get_key_exchange_data;
+ this->public.set_key_exchange_data = (status_t (*) (ke_payload_t *,chunk_t)) set_key_exchange_data;
+ this->public.get_dh_group_number = (diffie_hellman_group_t (*) (ke_payload_t *)) get_dh_group_number;
+ this->public.set_dh_group_number =(status_t (*) (ke_payload_t *,diffie_hellman_group_t)) set_dh_group_number;
+ this->public.destroy = (status_t (*) (ke_payload_t *)) destroy;
+
+ /* private functions */
+ this->compute_length = compute_length;
+
+ /* set default values of the fields */
+ this->critical = KE_PAYLOAD_CRITICAL_FLAG;
+ this->next_payload = NO_PAYLOAD;
+ this->payload_length = KE_PAYLOAD_HEADER_LENGTH;
+ this->key_exchange_data.ptr = NULL;
+ this->key_exchange_data.len = 0;
+ this->dh_group_number = 0;
+
+ return (&(this->public));
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-21 09:09:10 +0000