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diff --git a/src/charon/encoding/payloads/proposal_substructure.c b/src/charon/encoding/payloads/proposal_substructure.c
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+++ b/src/charon/encoding/payloads/proposal_substructure.c
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+/**
+ * @file proposal_substructure.h
+ *
+ * @brief Implementation of proposal_substructure_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 "proposal_substructure.h"
+
+#include <encoding/payloads/encodings.h>
+#include <encoding/payloads/transform_substructure.h>
+#include <library.h>
+#include <utils/linked_list.h>
+#include <daemon.h>
+
+
+/**
+ * IKEv1 Value for a proposal payload.
+ */
+#define PROPOSAL_TYPE_VALUE 2
+
+
+typedef struct private_proposal_substructure_t private_proposal_substructure_t;
+
+/**
+ * Private data of an proposal_substructure_t object.
+ *
+ */
+struct private_proposal_substructure_t {
+ /**
+ * Public proposal_substructure_t interface.
+ */
+ proposal_substructure_t public;
+
+ /**
+ * Next payload type.
+ */
+ u_int8_t next_payload;
+
+ /**
+ * Length of this payload.
+ */
+ u_int16_t proposal_length;
+
+ /**
+ * Proposal number.
+ */
+ u_int8_t proposal_number;
+
+ /**
+ * Protocol ID.
+ */
+ u_int8_t protocol_id;
+
+ /**
+ * SPI size of the following SPI.
+ */
+ u_int8_t spi_size;
+
+ /**
+ * Number of transforms.
+ */
+ u_int8_t transforms_count;
+
+ /**
+ * SPI is stored as chunk.
+ */
+ chunk_t spi;
+
+ /**
+ * Transforms are stored in a linked_list_t.
+ */
+ linked_list_t * transforms;
+};
+
+/**
+ * Encoding rules to parse or generate a Proposal substructure.
+ *
+ * The defined offsets are the positions in a object of type
+ * private_proposal_substructure_t.
+ */
+encoding_rule_t proposal_substructure_encodings[] = {
+ /* 1 Byte next payload type, stored in the field next_payload */
+ { U_INT_8, offsetof(private_proposal_substructure_t, next_payload) },
+ /* Reserved Byte is skipped */
+ { RESERVED_BYTE, 0 },
+ /* Length of the whole proposal substructure payload*/
+ { PAYLOAD_LENGTH, offsetof(private_proposal_substructure_t, proposal_length) },
+ /* proposal number is a number of 8 bit */
+ { U_INT_8, offsetof(private_proposal_substructure_t, proposal_number) },
+ /* protocol ID is a number of 8 bit */
+ { U_INT_8, offsetof(private_proposal_substructure_t, protocol_id) },
+ /* SPI Size has its own type */
+ { SPI_SIZE, offsetof(private_proposal_substructure_t, spi_size) },
+ /* Number of transforms is a number of 8 bit */
+ { U_INT_8, offsetof(private_proposal_substructure_t, transforms_count) },
+ /* SPI is a chunk of variable size*/
+ { SPI, offsetof(private_proposal_substructure_t, spi) },
+ /* Transforms are stored in a transform substructure,
+ offset points to a linked_list_t pointer */
+ { TRANSFORMS, offsetof(private_proposal_substructure_t, transforms) }
+};
+
+/*
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! 0 (last) or 2 ! RESERVED ! Proposal Length !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Proposal # ! Protocol ID ! SPI Size !# of Transforms!
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ~ SPI (variable) ~
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! !
+ ~ <Transforms> ~
+ ! !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+/**
+ * Implementation of payload_t.verify.
+ */
+static status_t verify(private_proposal_substructure_t *this)
+{
+ status_t status = SUCCESS;
+ iterator_t *iterator;
+ payload_t *current_transform;
+
+ if ((this->next_payload != NO_PAYLOAD) && (this->next_payload != 2))
+ {
+ /* must be 0 or 2 */
+ DBG1(DBG_ENC, "inconsistent next payload");
+ return FAILED;
+ }
+ if (this->transforms_count != this->transforms->get_count(this->transforms))
+ {
+ /* must be the same! */
+ DBG1(DBG_ENC, "transform count invalid");
+ return FAILED;
+ }
+
+ switch (this->protocol_id)
+ {
+ case PROTO_AH:
+ case PROTO_ESP:
+ if (this->spi.len != 4)
+ {
+ DBG1(DBG_ENC, "invalid SPI length in %N proposal",
+ protocol_id_names, this->protocol_id);
+ return FAILED;
+ }
+ break;
+ case PROTO_IKE:
+ if (this->spi.len != 0 && this->spi.len != 8)
+ {
+ DBG1(DBG_ENC, "invalid SPI length in IKE proposal");
+ return FAILED;
+ }
+ break;
+ default:
+ DBG1(DBG_ENC, "invalid proposal protocol (%d)", this->protocol_id);
+ return FAILED;
+ }
+ if ((this->protocol_id == 0) || (this->protocol_id >= 4))
+ {
+ /* reserved are not supported */
+ DBG1(DBG_ENC, "invalid protocol");
+ return FAILED;
+ }
+
+ iterator = this->transforms->create_iterator(this->transforms,TRUE);
+ while(iterator->iterate(iterator, (void**)&current_transform))
+ {
+ status = current_transform->verify(current_transform);
+ if (status != SUCCESS)
+ {
+ DBG1(DBG_ENC, "TRANSFORM_SUBSTRUCTURE verification failed");
+ break;
+ }
+ }
+ iterator->destroy(iterator);
+
+ /* proposal number is checked in SA payload */
+ return status;
+}
+
+/**
+ * Implementation of payload_t.get_encoding_rules.
+ */
+static void get_encoding_rules(private_proposal_substructure_t *this, encoding_rule_t **rules, size_t *rule_count)
+{
+ *rules = proposal_substructure_encodings;
+ *rule_count = sizeof(proposal_substructure_encodings) / sizeof(encoding_rule_t);
+}
+
+/**
+ * Implementation of payload_t.get_type.
+ */
+static payload_type_t get_type(private_proposal_substructure_t *this)
+{
+ return PROPOSAL_SUBSTRUCTURE;
+}
+
+/**
+ * Implementation of payload_t.get_next_type.
+ */
+static payload_type_t get_next_type(private_proposal_substructure_t *this)
+{
+ return (this->next_payload);
+}
+
+/**
+ * Implementation of payload_t.set_next_type.
+ */
+static void set_next_type(private_proposal_substructure_t *this,payload_type_t type)
+{
+}
+
+/**
+ * (re-)compute the length of the payload.
+ */
+static void compute_length(private_proposal_substructure_t *this)
+{
+ iterator_t *iterator;
+ payload_t *current_transform;
+ size_t transforms_count = 0;
+ size_t length = PROPOSAL_SUBSTRUCTURE_HEADER_LENGTH;
+
+ iterator = this->transforms->create_iterator(this->transforms,TRUE);
+ while (iterator->iterate(iterator, (void**)&current_transform))
+ {
+ length += current_transform->get_length(current_transform);
+ transforms_count++;
+ }
+ iterator->destroy(iterator);
+
+ length += this->spi.len;
+ this->transforms_count = transforms_count;
+ this->proposal_length = length;
+}
+
+/**
+ * Implementation of payload_t.get_length.
+ */
+static size_t get_length(private_proposal_substructure_t *this)
+{
+ compute_length(this);
+ return this->proposal_length;
+}
+
+/**
+ * Implementation of proposal_substructure_t.create_transform_substructure_iterator.
+ */
+static iterator_t *create_transform_substructure_iterator (private_proposal_substructure_t *this,bool forward)
+{
+ return (this->transforms->create_iterator(this->transforms,forward));
+}
+
+/**
+ * Implementation of proposal_substructure_t.add_transform_substructure.
+ */
+static void add_transform_substructure (private_proposal_substructure_t *this,transform_substructure_t *transform)
+{
+ status_t status;
+ if (this->transforms->get_count(this->transforms) > 0)
+ {
+ transform_substructure_t *last_transform;
+ status = this->transforms->get_last(this->transforms,(void **) &last_transform);
+ /* last transform is now not anymore last one */
+ last_transform->set_is_last_transform(last_transform,FALSE);
+
+ }
+ transform->set_is_last_transform(transform,TRUE);
+
+ this->transforms->insert_last(this->transforms,(void *) transform);
+ compute_length(this);
+}
+
+/**
+ * Implementation of proposal_substructure_t.proposal_substructure_t.
+ */
+static void set_is_last_proposal (private_proposal_substructure_t *this, bool is_last)
+{
+ this->next_payload = (is_last) ? 0: PROPOSAL_TYPE_VALUE;
+}
+
+/**
+ * Implementation of proposal_substructure_t.set_proposal_number.
+ */
+static void set_proposal_number(private_proposal_substructure_t *this,u_int8_t proposal_number)
+{
+ this->proposal_number = proposal_number;
+}
+
+/**
+ * Implementation of proposal_substructure_t.get_proposal_number.
+ */
+static u_int8_t get_proposal_number (private_proposal_substructure_t *this)
+{
+ return (this->proposal_number);
+}
+
+/**
+ * Implementation of proposal_substructure_t.set_protocol_id.
+ */
+static void set_protocol_id(private_proposal_substructure_t *this,u_int8_t protocol_id)
+{
+ this->protocol_id = protocol_id;
+}
+
+/**
+ * Implementation of proposal_substructure_t.get_protocol_id.
+ */
+static u_int8_t get_protocol_id(private_proposal_substructure_t *this)
+{
+ return (this->protocol_id);
+}
+
+/**
+ * Implementation of proposal_substructure_t.set_spi.
+ */
+static void set_spi(private_proposal_substructure_t *this, chunk_t spi)
+{
+ /* first delete already set spi value */
+ if (this->spi.ptr != NULL)
+ {
+ free(this->spi.ptr);
+ this->spi.ptr = NULL;
+ this->spi.len = 0;
+ compute_length(this);
+ }
+
+ this->spi.ptr = clalloc(spi.ptr,spi.len);
+ this->spi.len = spi.len;
+ this->spi_size = spi.len;
+ compute_length(this);
+}
+
+/**
+ * Implementation of proposal_substructure_t.get_spi.
+ */
+static chunk_t get_spi(private_proposal_substructure_t *this)
+{
+ chunk_t spi;
+ spi.ptr = this->spi.ptr;
+ spi.len = this->spi.len;
+
+ return spi;
+}
+
+/**
+ * Implementation of proposal_substructure_t.get_transform_count.
+ */
+static size_t get_transform_count (private_proposal_substructure_t *this)
+{
+ return this->transforms->get_count(this->transforms);
+}
+
+/**
+ * Implementation of proposal_substructure_t.get_spi_size.
+ */
+static size_t get_spi_size (private_proposal_substructure_t *this)
+{
+ return this->spi.len;
+}
+
+/**
+ * Implementation of proposal_substructure_t.get_proposal.
+ */
+proposal_t* get_proposal(private_proposal_substructure_t *this)
+{
+ iterator_t *iterator;
+ transform_substructure_t *transform;
+ proposal_t *proposal;
+ u_int64_t spi;
+
+ proposal = proposal_create(this->protocol_id);
+
+ iterator = this->transforms->create_iterator(this->transforms, TRUE);
+ while (iterator->iterate(iterator, (void**)&transform))
+ {
+ transform_type_t transform_type;
+ u_int16_t transform_id;
+ u_int16_t key_length = 0;
+
+ transform_type = transform->get_transform_type(transform);
+ transform_id = transform->get_transform_id(transform);
+ transform->get_key_length(transform, &key_length);
+
+ proposal->add_algorithm(proposal, transform_type, transform_id, key_length);
+ }
+ iterator->destroy(iterator);
+
+ switch (this->spi.len)
+ {
+ case 4:
+ spi = *((u_int32_t*)this->spi.ptr);
+ break;
+ case 8:
+ spi = *((u_int64_t*)this->spi.ptr);
+ break;
+ default:
+ spi = 0;
+ }
+ proposal->set_spi(proposal, spi);
+
+ return proposal;
+}
+
+/**
+ * Implementation of proposal_substructure_t.clone.
+ */
+static private_proposal_substructure_t* clone_(private_proposal_substructure_t *this)
+{
+ private_proposal_substructure_t *clone;
+ iterator_t *transforms;
+ transform_substructure_t *current_transform;
+
+ clone = (private_proposal_substructure_t *) proposal_substructure_create();
+ clone->next_payload = this->next_payload;
+ clone->proposal_number = this->proposal_number;
+ clone->protocol_id = this->protocol_id;
+ clone->spi_size = this->spi_size;
+ if (this->spi.ptr != NULL)
+ {
+ clone->spi.ptr = clalloc(this->spi.ptr,this->spi.len);
+ clone->spi.len = this->spi.len;
+ }
+
+ transforms = this->transforms->create_iterator(this->transforms,FALSE);
+ while (transforms->iterate(transforms, (void**)&current_transform))
+ {
+ current_transform = current_transform->clone(current_transform);
+ clone->public.add_transform_substructure(&clone->public, current_transform);
+ }
+ transforms->destroy(transforms);
+
+ return clone;
+}
+
+/**
+ * Implements payload_t's and proposal_substructure_t's destroy function.
+ * See #payload_s.destroy or proposal_substructure_s.destroy for description.
+ */
+static void destroy(private_proposal_substructure_t *this)
+{
+ this->transforms->destroy_offset(this->transforms,
+ offsetof(transform_substructure_t, destroy));
+ chunk_free(&this->spi);
+ free(this);
+}
+
+/*
+ * Described in header.
+ */
+proposal_substructure_t *proposal_substructure_create()
+{
+ private_proposal_substructure_t *this = malloc_thing(private_proposal_substructure_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.create_transform_substructure_iterator = (iterator_t* (*) (proposal_substructure_t *,bool)) create_transform_substructure_iterator;
+ this->public.add_transform_substructure = (void (*) (proposal_substructure_t *,transform_substructure_t *)) add_transform_substructure;
+ this->public.set_proposal_number = (void (*) (proposal_substructure_t *,u_int8_t))set_proposal_number;
+ this->public.get_proposal_number = (u_int8_t (*) (proposal_substructure_t *)) get_proposal_number;
+ this->public.set_protocol_id = (void (*) (proposal_substructure_t *,u_int8_t))set_protocol_id;
+ this->public.get_protocol_id = (u_int8_t (*) (proposal_substructure_t *)) get_protocol_id;
+ this->public.set_is_last_proposal = (void (*) (proposal_substructure_t *,bool)) set_is_last_proposal;
+ this->public.get_proposal = (proposal_t* (*) (proposal_substructure_t*))get_proposal;
+ this->public.set_spi = (void (*) (proposal_substructure_t *,chunk_t))set_spi;
+ this->public.get_spi = (chunk_t (*) (proposal_substructure_t *)) get_spi;
+ this->public.get_transform_count = (size_t (*) (proposal_substructure_t *)) get_transform_count;
+ this->public.get_spi_size = (size_t (*) (proposal_substructure_t *)) get_spi_size;
+ this->public.clone = (proposal_substructure_t * (*) (proposal_substructure_t *)) clone_;
+ this->public.destroy = (void (*) (proposal_substructure_t *)) destroy;
+
+ /* set default values of the fields */
+ this->next_payload = NO_PAYLOAD;
+ this->proposal_length = 0;
+ this->proposal_number = 0;
+ this->protocol_id = 0;
+ this->transforms_count = 0;
+ this->spi_size = 0;
+ this->spi.ptr = NULL;
+ this->spi.len = 0;
+
+ this->transforms = linked_list_create();
+
+ return (&(this->public));
+}
+
+/*
+ * Described in header.
+ */
+proposal_substructure_t *proposal_substructure_create_from_proposal(proposal_t *proposal)
+{
+ private_proposal_substructure_t *this = (private_proposal_substructure_t*)
+ proposal_substructure_create();
+ iterator_t *iterator;
+ algorithm_t *algo;
+ transform_substructure_t *transform;
+
+ /* encryption algorithm is only availble in ESP */
+ iterator = proposal->create_algorithm_iterator(proposal, ENCRYPTION_ALGORITHM);
+ while (iterator->iterate(iterator, (void**)&algo))
+ {
+ transform = transform_substructure_create_type(ENCRYPTION_ALGORITHM,
+ algo->algorithm, algo->key_size);
+ this->public.add_transform_substructure(&(this->public), transform);
+ }
+ iterator->destroy(iterator);
+
+ /* integrity algorithms */
+ iterator = proposal->create_algorithm_iterator(proposal, INTEGRITY_ALGORITHM);
+ while (iterator->iterate(iterator, (void**)&algo))
+ {
+ transform = transform_substructure_create_type(INTEGRITY_ALGORITHM,
+ algo->algorithm, algo->key_size);
+ this->public.add_transform_substructure(&(this->public), transform);
+ }
+ iterator->destroy(iterator);
+
+ /* prf algorithms */
+ iterator = proposal->create_algorithm_iterator(proposal, PSEUDO_RANDOM_FUNCTION);
+ while (iterator->iterate(iterator, (void**)&algo))
+ {
+ transform = transform_substructure_create_type(PSEUDO_RANDOM_FUNCTION,
+ algo->algorithm, algo->key_size);
+ this->public.add_transform_substructure(&(this->public), transform);
+ }
+ iterator->destroy(iterator);
+
+ /* dh groups */
+ iterator = proposal->create_algorithm_iterator(proposal, DIFFIE_HELLMAN_GROUP);
+ while (iterator->iterate(iterator, (void**)&algo))
+ {
+ transform = transform_substructure_create_type(DIFFIE_HELLMAN_GROUP, algo->algorithm, 0);
+ this->public.add_transform_substructure(&(this->public), transform);
+ }
+ iterator->destroy(iterator);
+
+ /* extended sequence numbers */
+ iterator = proposal->create_algorithm_iterator(proposal, EXTENDED_SEQUENCE_NUMBERS);
+ while (iterator->iterate(iterator, (void**)&algo))
+ {
+ transform = transform_substructure_create_type(EXTENDED_SEQUENCE_NUMBERS,
+ algo->algorithm, 0);
+ this->public.add_transform_substructure(&(this->public), transform);
+ }
+ iterator->destroy(iterator);
+
+ /* add SPI, if necessary */
+ switch (proposal->get_protocol(proposal))
+ {
+ case PROTO_AH:
+ case PROTO_ESP:
+ this->spi_size = this->spi.len = 4;
+ this->spi.ptr = malloc(this->spi_size);
+ *((u_int32_t*)this->spi.ptr) = proposal->get_spi(proposal);
+ break;
+ case PROTO_IKE:
+ if (proposal->get_spi(proposal))
+ { /* IKE only uses SPIS when rekeying, but on initial setup */
+ this->spi_size = this->spi.len = 8;
+ this->spi.ptr = malloc(this->spi_size);
+ *((u_int64_t*)this->spi.ptr) = proposal->get_spi(proposal);
+ }
+ break;
+ default:
+ break;
+ }
+ this->proposal_number = 0;
+ this->protocol_id = proposal->get_protocol(proposal);
+
+ return &this->public;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 05:40:20 +0000