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Diffstat (limited to 'src/charon/encoding/payloads/sa_payload.c')
-rw-r--r--src/charon/encoding/payloads/sa_payload.c375
1 files changed, 375 insertions, 0 deletions
diff --git a/src/charon/encoding/payloads/sa_payload.c b/src/charon/encoding/payloads/sa_payload.c
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+++ b/src/charon/encoding/payloads/sa_payload.c
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+/**
+ * @file sa_payload.c
+ *
+ * @brief Implementation of sa_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 "sa_payload.h"
+
+#include <encoding/payloads/encodings.h>
+#include <utils/linked_list.h>
+#include <daemon.h>
+
+
+typedef struct private_sa_payload_t private_sa_payload_t;
+
+/**
+ * Private data of an sa_payload_t object.
+ *
+ */
+struct private_sa_payload_t {
+ /**
+ * Public sa_payload_t interface.
+ */
+ sa_payload_t public;
+
+ /**
+ * Next payload type.
+ */
+ u_int8_t next_payload;
+
+ /**
+ * Critical flag.
+ */
+ bool critical;
+
+ /**
+ * Length of this payload.
+ */
+ u_int16_t payload_length;
+
+ /**
+ * Proposals in this payload are stored in a linked_list_t.
+ */
+ linked_list_t * proposals;
+};
+
+/**
+ * Encoding rules to parse or generate a IKEv2-SA Payload
+ *
+ * The defined offsets are the positions in a object of type
+ * private_sa_payload_t.
+ *
+ */
+encoding_rule_t sa_payload_encodings[] = {
+ /* 1 Byte next payload type, stored in the field next_payload */
+ { U_INT_8, offsetof(private_sa_payload_t, next_payload) },
+ /* the critical bit */
+ { FLAG, offsetof(private_sa_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 SA payload*/
+ { PAYLOAD_LENGTH, offsetof(private_sa_payload_t, payload_length) },
+ /* Proposals are stored in a proposal substructure,
+ offset points to a linked_list_t pointer */
+ { PROPOSALS, offsetof(private_sa_payload_t, proposals) }
+};
+
+/*
+ 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 !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! !
+ ~ <Proposals> ~
+ ! !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+/**
+ * Implementation of payload_t.verify.
+ */
+static status_t verify(private_sa_payload_t *this)
+{
+ int expected_number = 1, current_number;
+ status_t status = SUCCESS;
+ iterator_t *iterator;
+ proposal_substructure_t *current_proposal;
+ bool first = TRUE;
+
+ /* check proposal numbering */
+ iterator = this->proposals->create_iterator(this->proposals,TRUE);
+
+ while(iterator->iterate(iterator, (void**)&current_proposal))
+ {
+ current_number = current_proposal->get_proposal_number(current_proposal);
+ if (current_number < expected_number)
+ {
+ if (current_number != (expected_number + 1))
+ {
+ DBG1(DBG_ENC, "proposal number is %d, excepted %d or %d",
+ current_number, expected_number, expected_number + 1);
+ status = FAILED;
+ break;
+ }
+ }
+ else if (current_number < expected_number)
+ {
+ /* must not be smaller then proceeding one */
+ DBG1(DBG_ENC, "proposal number smaller than that of previous proposal");
+ status = FAILED;
+ break;
+ }
+
+ status = current_proposal->payload_interface.verify(&(current_proposal->payload_interface));
+ if (status != SUCCESS)
+ {
+ DBG1(DBG_ENC, "PROPOSAL_SUBSTRUCTURE verification failed");
+ break;
+ }
+ first = FALSE;
+ expected_number = current_number;
+ }
+
+ iterator->destroy(iterator);
+ return status;
+}
+
+
+/**
+ * Implementation of payload_t.destroy and sa_payload_t.destroy.
+ */
+static status_t destroy(private_sa_payload_t *this)
+{
+ this->proposals->destroy_offset(this->proposals,
+ offsetof(proposal_substructure_t, destroy));
+ free(this);
+ return SUCCESS;
+}
+
+/**
+ * Implementation of payload_t.get_encoding_rules.
+ */
+static void get_encoding_rules(private_sa_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
+{
+ *rules = sa_payload_encodings;
+ *rule_count = sizeof(sa_payload_encodings) / sizeof(encoding_rule_t);
+}
+
+/**
+ * Implementation of payload_t.get_type.
+ */
+static payload_type_t get_type(private_sa_payload_t *this)
+{
+ return SECURITY_ASSOCIATION;
+}
+
+/**
+ * Implementation of payload_t.get_next_type.
+ */
+static payload_type_t get_next_type(private_sa_payload_t *this)
+{
+ return (this->next_payload);
+}
+
+/**
+ * Implementation of payload_t.set_next_type.
+ */
+static void set_next_type(private_sa_payload_t *this,payload_type_t type)
+{
+ this->next_payload = type;
+}
+
+/**
+ * recompute length of the payload.
+ */
+static void compute_length (private_sa_payload_t *this)
+{
+ iterator_t *iterator;
+ payload_t *current_proposal;
+ size_t length = SA_PAYLOAD_HEADER_LENGTH;
+
+ iterator = this->proposals->create_iterator(this->proposals,TRUE);
+ while (iterator->iterate(iterator, (void **)&current_proposal))
+ {
+ length += current_proposal->get_length(current_proposal);
+ }
+ iterator->destroy(iterator);
+
+ this->payload_length = length;
+}
+
+/**
+ * Implementation of payload_t.get_length.
+ */
+static size_t get_length(private_sa_payload_t *this)
+{
+ compute_length(this);
+ return this->payload_length;
+}
+
+/**
+ * Implementation of sa_payload_t.create_proposal_substructure_iterator.
+ */
+static iterator_t *create_proposal_substructure_iterator (private_sa_payload_t *this,bool forward)
+{
+ return this->proposals->create_iterator(this->proposals,forward);
+}
+
+/**
+ * Implementation of sa_payload_t.add_proposal_substructure.
+ */
+static void add_proposal_substructure(private_sa_payload_t *this,proposal_substructure_t *proposal)
+{
+ status_t status;
+ u_int proposal_count = this->proposals->get_count(this->proposals);
+
+ if (proposal_count > 0)
+ {
+ proposal_substructure_t *last_proposal;
+ status = this->proposals->get_last(this->proposals,(void **) &last_proposal);
+ /* last transform is now not anymore last one */
+ last_proposal->set_is_last_proposal(last_proposal, FALSE);
+ }
+ proposal->set_is_last_proposal(proposal, TRUE);
+ proposal->set_proposal_number(proposal, proposal_count + 1);
+ this->proposals->insert_last(this->proposals,(void *) proposal);
+ compute_length(this);
+}
+
+/**
+ * Implementation of sa_payload_t.add_proposal.
+ */
+static void add_proposal(private_sa_payload_t *this, proposal_t *proposal)
+{
+ proposal_substructure_t *substructure;
+
+ substructure = proposal_substructure_create_from_proposal(proposal);
+ add_proposal_substructure(this, substructure);
+}
+
+/**
+ * Implementation of sa_payload_t.get_proposals.
+ */
+static linked_list_t *get_proposals(private_sa_payload_t *this)
+{
+ int struct_number = 0;
+ int ignore_struct_number = 0;
+ iterator_t *iterator;
+ proposal_substructure_t *proposal_struct;
+ linked_list_t *proposal_list;
+
+ /* this list will hold our proposals */
+ proposal_list = linked_list_create();
+
+ /* we do not support proposals split up to two proposal substructures, as
+ * AH+ESP bundles are not supported in RFC4301 anymore.
+ * To handle such structures safely, we just skip proposals with multiple
+ * protocols.
+ */
+ iterator = this->proposals->create_iterator(this->proposals, TRUE);
+ while (iterator->iterate(iterator, (void **)&proposal_struct))
+ {
+ proposal_t *proposal;
+
+ /* check if a proposal has a single protocol */
+ if (proposal_struct->get_proposal_number(proposal_struct) == struct_number)
+ {
+ if (ignore_struct_number < struct_number)
+ {
+ /* remova an already added, if first of series */
+ proposal_list->remove_last(proposal_list, (void**)&proposal);
+ proposal->destroy(proposal);
+ ignore_struct_number = struct_number;
+ }
+ continue;
+ }
+ struct_number++;
+ proposal = proposal_struct->get_proposal(proposal_struct);
+ if (proposal)
+ {
+ proposal_list->insert_last(proposal_list, proposal);
+ }
+ }
+ iterator->destroy(iterator);
+ return proposal_list;
+}
+
+/*
+ * Described in header.
+ */
+sa_payload_t *sa_payload_create()
+{
+ private_sa_payload_t *this = malloc_thing(private_sa_payload_t);
+
+ /* public interface */
+ 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_proposal_substructure_iterator = (iterator_t* (*) (sa_payload_t *,bool)) create_proposal_substructure_iterator;
+ this->public.add_proposal_substructure = (void (*) (sa_payload_t *,proposal_substructure_t *)) add_proposal_substructure;
+ this->public.add_proposal = (void (*) (sa_payload_t*,proposal_t*))add_proposal;
+ this->public.get_proposals = (linked_list_t* (*) (sa_payload_t *)) get_proposals;
+ this->public.destroy = (void (*) (sa_payload_t *)) destroy;
+
+ /* set default values of the fields */
+ this->critical = FALSE;
+ this->next_payload = NO_PAYLOAD;
+ this->payload_length = SA_PAYLOAD_HEADER_LENGTH;
+ this->proposals = linked_list_create();
+ return &this->public;
+}
+
+/*
+ * Described in header.
+ */
+sa_payload_t *sa_payload_create_from_proposal_list(linked_list_t *proposals)
+{
+ iterator_t *iterator;
+ proposal_t *proposal;
+ sa_payload_t *sa_payload = sa_payload_create();
+
+ /* add every payload from the list */
+ iterator = proposals->create_iterator(proposals, TRUE);
+ while (iterator->iterate(iterator, (void**)&proposal))
+ {
+ add_proposal((private_sa_payload_t*)sa_payload, proposal);
+ }
+ iterator->destroy(iterator);
+
+ return sa_payload;
+}
+
+/*
+ * Described in header.
+ */
+sa_payload_t *sa_payload_create_from_proposal(proposal_t *proposal)
+{
+ sa_payload_t *sa_payload = sa_payload_create();
+
+ add_proposal((private_sa_payload_t*)sa_payload, proposal);
+
+ return sa_payload;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-20 02:45:58 +0000