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-rw-r--r--src/libcharon/encoding/payloads/ke_payload.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/src/libcharon/encoding/payloads/ke_payload.c b/src/libcharon/encoding/payloads/ke_payload.c
new file mode 100644
index 000000000..1bc79f084
--- /dev/null
+++ b/src/libcharon/encoding/payloads/ke_payload.c
@@ -0,0 +1,270 @@
+/*
+ * 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 "ke_payload.h"
+
+#include <encoding/payloads/encodings.h>
+
+
+typedef struct private_ke_payload_t private_ke_payload_t;
+
+/**
+ * Private data of an ke_payload_t object.
+ *
+ */
+struct private_ke_payload_t {
+ /**
+ * 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.
+ */
+ u_int16_t dh_group_number;
+
+ /**
+ * Key Exchange Data of this KE payload.
+ */
+ chunk_t key_exchange_data;
+};
+
+/**
+ * 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 ~
+ ! !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+/**
+ * Implementation of payload_t.verify.
+ */
+static status_t verify(private_ke_payload_t *this)
+{
+ /* dh group is not verified in here */
+ return SUCCESS;
+}
+
+/**
+ * Implementation of payload_t.destroy.
+ */
+static void destroy(private_ke_payload_t *this)
+{
+ if (this->key_exchange_data.ptr != NULL)
+ {
+ free(this->key_exchange_data.ptr);
+ }
+ free(this);
+}
+
+/**
+ * Implementation of payload_t.get_encoding_rules.
+ */
+static void 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);
+}
+
+/**
+ * Implementation of payload_t.get_type.
+ */
+static payload_type_t get_type(private_ke_payload_t *this)
+{
+ return KEY_EXCHANGE;
+}
+
+/**
+ * Implementation of payload_t.get_next_type.
+ */
+static payload_type_t get_next_type(private_ke_payload_t *this)
+{
+ return (this->next_payload);
+}
+
+/**
+ * Implementation of payload_t.set_next_type.
+ */
+static void set_next_type(private_ke_payload_t *this,payload_type_t type)
+{
+ this->next_payload = type;
+}
+
+/**
+ * recompute the length of the payload.
+ */
+static void 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;
+}
+
+/**
+ * Implementation of payload_t.get_length.
+ */
+static size_t get_length(private_ke_payload_t *this)
+{
+ compute_length(this);
+ return this->payload_length;
+}
+
+/**
+ * Implementation of ke_payload_t.get_key_exchange_data.
+ */
+static chunk_t get_key_exchange_data(private_ke_payload_t *this)
+{
+ return (this->key_exchange_data);
+}
+
+/**
+ * Implementation of ke_payload_t.set_key_exchange_data.
+ */
+static void 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 */
+ free(this->key_exchange_data.ptr);
+ this->key_exchange_data.ptr = NULL;
+ this->key_exchange_data.len = 0;
+
+ }
+
+ this->key_exchange_data = chunk_clone(key_exchange_data);
+ compute_length(this);
+}
+
+/**
+ * Implementation of ke_payload_t.get_dh_group_number.
+ */
+static diffie_hellman_group_t get_dh_group_number(private_ke_payload_t *this)
+{
+ return this->dh_group_number;
+}
+
+/**
+ * Implementation of ke_payload_t.set_dh_group_number.
+ */
+static void set_dh_group_number(private_ke_payload_t *this, diffie_hellman_group_t dh_group_number)
+{
+ this->dh_group_number = dh_group_number;
+}
+
+/*
+ * Described in header
+ */
+ke_payload_t *ke_payload_create()
+{
+ private_ke_payload_t *this = malloc_thing(private_ke_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_type;
+ this->public.payload_interface.destroy = (void (*) (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 = (void (*) (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 =(void (*) (ke_payload_t *,diffie_hellman_group_t)) set_dh_group_number;
+ this->public.destroy = (void (*) (ke_payload_t *)) destroy;
+
+ /* set default values of the fields */
+ this->critical = FALSE;
+ this->next_payload = NO_PAYLOAD;
+ this->payload_length = KE_PAYLOAD_HEADER_LENGTH;
+ this->key_exchange_data = chunk_empty;
+ this->dh_group_number = MODP_NONE;
+
+ return &this->public;
+}
+
+/*
+ * Described in header
+ */
+ke_payload_t *ke_payload_create_from_diffie_hellman(diffie_hellman_t *dh)
+{
+ private_ke_payload_t *this = (private_ke_payload_t*)ke_payload_create();
+
+ dh->get_my_public_value(dh, &this->key_exchange_data);
+ this->dh_group_number = dh->get_dh_group(dh);
+ compute_length(this);
+
+ return &this->public;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 07:12:57 +0000