/* * Copyright (C) 2005-2010 Martin Willi * Copyright (C) 2010 revosec AG * 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 . * * 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 #include "transform_substructure.h" #include #include #include #include #include typedef struct private_transform_substructure_t private_transform_substructure_t; /** * Private data of an transform_substructure_t object. */ struct private_transform_substructure_t { /** * Public transform_substructure_t interface. */ transform_substructure_t public; /** * Next payload type. */ uint8_t next_payload; /** * Reserved byte */ uint8_t reserved[3]; /** * Length of this payload. */ uint16_t transform_length; /** * Type or number, Type of the transform in IKEv2, number in IKEv2. */ uint8_t transform_ton; /** * Transform ID, as encoded in IKEv1. */ uint8_t transform_id_v1; /** * Transform ID, as encoded in IKEv2. */ uint16_t transform_id_v2; /** * Transforms Attributes are stored in a linked_list_t. */ linked_list_t *attributes; /** * Payload type, PLV2_TRANSFORM_SUBSTRUCTURE or PLV1_TRANSFORM_SUBSTRUCTURE */ payload_type_t type; }; /** * Encoding rules for PLV2_TRANSFORM_SUBSTRUCTURE */ static encoding_rule_t encodings_v2[] = { /* 1 Byte next payload type, stored in the field next_payload */ { U_INT_8, offsetof(private_transform_substructure_t, next_payload) }, /* 1 Reserved Byte */ { RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[0]) }, /* Length of the whole transform substructure*/ { PAYLOAD_LENGTH, offsetof(private_transform_substructure_t, transform_length)}, /* transform type */ { U_INT_8, offsetof(private_transform_substructure_t, transform_ton) }, /* transform identifier, as used by IKEv1 */ { RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[1]) }, /* transform identifier, as used by IKEv2 */ { U_INT_16, offsetof(private_transform_substructure_t, transform_id_v2) }, /* Attributes in a transform attribute list */ { PAYLOAD_LIST + PLV2_TRANSFORM_ATTRIBUTE, offsetof(private_transform_substructure_t, attributes) } }; /** * Encoding rules for PLV1_TRANSFORM_SUBSTRUCTURE */ static encoding_rule_t encodings_v1[] = { /* 1 Byte next payload type, stored in the field next_payload */ { U_INT_8, offsetof(private_transform_substructure_t, next_payload) }, /* 1 Reserved Byte */ { RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[0]) }, /* Length of the whole transform substructure*/ { PAYLOAD_LENGTH, offsetof(private_transform_substructure_t, transform_length)}, /* transform number */ { U_INT_8, offsetof(private_transform_substructure_t, transform_ton)}, /* transform identifier, as used by IKEv1 */ { U_INT_8, offsetof(private_transform_substructure_t, transform_id_v1) }, /* transform identifier, as used by IKEv2 */ { RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[1]) }, { RESERVED_BYTE, offsetof(private_transform_substructure_t, reserved[2]) }, /* Attributes in a transform attribute list */ { PAYLOAD_LIST + PLV1_TRANSFORM_ATTRIBUTE, offsetof(private_transform_substructure_t, attributes) } }; /* 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 3 ! RESERVED ! Transform Length ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Tfrm Typ or # ! Tfrm ID IKEv1 ! Transform ID IKEv2 ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! ! ~ Transform Attributes ~ ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ METHOD(payload_t, verify, status_t, private_transform_substructure_t *this) { status_t status = SUCCESS; enumerator_t *enumerator; payload_t *attribute; if (this->next_payload != PL_NONE && this->next_payload != 3) { DBG1(DBG_ENC, "inconsistent next payload"); return FAILED; } enumerator = this->attributes->create_enumerator(this->attributes); while (enumerator->enumerate(enumerator, &attribute)) { status = attribute->verify(attribute); if (status != SUCCESS) { DBG1(DBG_ENC, "TRANSFORM_ATTRIBUTE verification failed"); break; } } enumerator->destroy(enumerator); /* proposal number is checked in SA payload */ return status; } METHOD(payload_t, get_encoding_rules, int, private_transform_substructure_t *this, encoding_rule_t **rules) { if (this->type == PLV2_TRANSFORM_SUBSTRUCTURE) { *rules = encodings_v2; return countof(encodings_v2); } *rules = encodings_v1; return countof(encodings_v1); } METHOD(payload_t, get_header_length, int, private_transform_substructure_t *this) { return 8; } METHOD(payload_t, get_type, payload_type_t, private_transform_substructure_t *this) { return this->type; } METHOD(payload_t, get_next_type, payload_type_t, private_transform_substructure_t *this) { return this->next_payload; } /** * recompute the length of the payload. */ static void compute_length(private_transform_substructure_t *this) { enumerator_t *enumerator; payload_t *attribute; this->transform_length = get_header_length(this); enumerator = this->attributes->create_enumerator(this->attributes); while (enumerator->enumerate(enumerator, &attribute)) { this->transform_length += attribute->get_length(attribute); } enumerator->destroy(enumerator); } METHOD(payload_t, get_length, size_t, private_transform_substructure_t *this) { return this->transform_length; } METHOD(transform_substructure_t, add_transform_attribute, void, private_transform_substructure_t *this, transform_attribute_t *attribute) { this->attributes->insert_last(this->attributes, attribute); compute_length(this); } METHOD(transform_substructure_t, set_is_last_transform, void, private_transform_substructure_t *this, bool is_last) { this->next_payload = is_last ? 0: TRANSFORM_TYPE_VALUE; } METHOD(payload_t, set_next_type, void, private_transform_substructure_t *this,payload_type_t type) { } METHOD(transform_substructure_t, get_transform_type_or_number, uint8_t, private_transform_substructure_t *this) { return this->transform_ton; } METHOD(transform_substructure_t, get_transform_id, uint16_t, private_transform_substructure_t *this) { if (this->type == PLV2_TRANSFORM_SUBSTRUCTURE) { return this->transform_id_v2; } return this->transform_id_v1; } METHOD(transform_substructure_t, create_attribute_enumerator, enumerator_t*, private_transform_substructure_t *this) { return this->attributes->create_enumerator(this->attributes); } METHOD2(payload_t, transform_substructure_t, destroy, void, private_transform_substructure_t *this) { this->attributes->destroy_offset(this->attributes, offsetof(payload_t, destroy)); free(this); } /* * Described in header. */ transform_substructure_t *transform_substructure_create(payload_type_t type) { private_transform_substructure_t *this; INIT(this, .public = { .payload_interface = { .verify = _verify, .get_encoding_rules = _get_encoding_rules, .get_header_length = _get_header_length, .get_length = _get_length, .get_next_type = _get_next_type, .set_next_type = _set_next_type, .get_type = _get_type, .destroy = _destroy, }, .add_transform_attribute = _add_transform_attribute, .set_is_last_transform = _set_is_last_transform, .get_transform_type_or_number = _get_transform_type_or_number, .get_transform_id = _get_transform_id, .create_attribute_enumerator = _create_attribute_enumerator, .destroy = _destroy, }, .next_payload = PL_NONE, .transform_length = get_header_length(this), .attributes = linked_list_create(), .type = type, ); return &this->public; } /* * Described in header */ transform_substructure_t *transform_substructure_create_type(payload_type_t type, uint8_t type_or_number, uint16_t id) { private_transform_substructure_t *this; this = (private_transform_substructure_t*)transform_substructure_create(type); this->transform_ton = type_or_number; if (type == PLV2_TRANSFORM_SUBSTRUCTURE) { this->transform_id_v2 = id; } else { this->transform_id_v1 = id; } return &this->public; }