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strongswan/src/libcharon/encoding/payloads/notify_payload.c

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/*
* Copyright (C) 2006-2008 Tobias Brunner
* Copyright (C) 2006 Daniel Roethlisberger
* 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 "notify_payload.h"
#include <daemon.h>
#include <encoding/payloads/encodings.h>
#include <crypto/hashers/hasher.h>
ENUM_BEGIN(notify_type_names, UNSUPPORTED_CRITICAL_PAYLOAD, UNSUPPORTED_CRITICAL_PAYLOAD,
"UNSUPPORTED_CRITICAL_PAYLOAD");
ENUM_NEXT(notify_type_names, INVALID_IKE_SPI, INVALID_MAJOR_VERSION, UNSUPPORTED_CRITICAL_PAYLOAD,
"INVALID_IKE_SPI",
"INVALID_MAJOR_VERSION");
ENUM_NEXT(notify_type_names, INVALID_SYNTAX, INVALID_SYNTAX, INVALID_MAJOR_VERSION,
"INVALID_SYNTAX");
ENUM_NEXT(notify_type_names, INVALID_MESSAGE_ID, INVALID_MESSAGE_ID, INVALID_SYNTAX,
"INVALID_MESSAGE_ID");
ENUM_NEXT(notify_type_names, INVALID_SPI, INVALID_SPI, INVALID_MESSAGE_ID,
"INVALID_SPI");
ENUM_NEXT(notify_type_names, NO_PROPOSAL_CHOSEN, NO_PROPOSAL_CHOSEN, INVALID_SPI,
"NO_PROPOSAL_CHOSEN");
ENUM_NEXT(notify_type_names, INVALID_KE_PAYLOAD, INVALID_KE_PAYLOAD, NO_PROPOSAL_CHOSEN,
"INVALID_KE_PAYLOAD");
ENUM_NEXT(notify_type_names, AUTHENTICATION_FAILED, AUTHENTICATION_FAILED, INVALID_KE_PAYLOAD,
"AUTHENTICATION_FAILED");
ENUM_NEXT(notify_type_names, SINGLE_PAIR_REQUIRED, CHILD_SA_NOT_FOUND, AUTHENTICATION_FAILED,
"SINGLE_PAIR_REQUIRED",
"NO_ADDITIONAL_SAS",
"INTERNAL_ADDRESS_FAILURE",
"FAILED_CP_REQUIRED",
"TS_UNACCEPTABLE",
"INVALID_SELECTORS",
"UNACCEPTABLE_ADDRESSES",
"UNEXPECTED_NAT_DETECTED",
"USE_ASSIGNED_HoA",
"TEMPORARY_FAILURE",
"CHILD_SA_NOT_FOUND");
ENUM_NEXT(notify_type_names, ME_CONNECT_FAILED, ME_CONNECT_FAILED, CHILD_SA_NOT_FOUND,
"ME_CONNECT_FAILED");
ENUM_NEXT(notify_type_names, INITIAL_CONTACT, EAP_ONLY_AUTHENTICATION, ME_CONNECT_FAILED,
"INITIAL_CONTACT",
"SET_WINDOW_SIZE",
"ADDITIONAL_TS_POSSIBLE",
"IPCOMP_SUPPORTED",
"NAT_DETECTION_SOURCE_IP",
"NAT_DETECTION_DESTINATION_IP",
"COOKIE",
"USE_TRANSPORT_MODE",
"HTTP_CERT_LOOKUP_SUPPORTED",
"REKEY_SA",
"ESP_TFC_PADDING_NOT_SUPPORTED",
"NON_FIRST_FRAGMENTS_ALSO",
"MOBIKE_SUPPORTED",
"ADDITIONAL_IP4_ADDRESS",
"ADDITIONAL_IP6_ADDRESS",
"NO_ADDITIONAL_ADDRESSES",
"UPDATE_SA_ADDRESSES",
"COOKIE2",
"NO_NATS_ALLOWED",
"AUTH_LIFETIME",
"MULTIPLE_AUTH_SUPPORTED",
"ANOTHER_AUTH_FOLLOWS",
"REDIRECT_SUPPORTED",
"REDIRECT",
"REDIRECTED_FROM",
"TICKET_LT_OPAQUE",
"TICKET_REQUEST",
"TICKET_ACK",
"TICKET_NACK",
"TICKET_OPAQUE",
"LINK_ID",
"USE_WESP_MODE",
"ROHC_SUPPORTED",
"EAP_ONLY_AUTHENTICATION");
ENUM_NEXT(notify_type_names, USE_BEET_MODE, USE_BEET_MODE, EAP_ONLY_AUTHENTICATION,
"USE_BEET_MODE");
ENUM_NEXT(notify_type_names, ME_MEDIATION, ME_RESPONSE, USE_BEET_MODE,
"ME_MEDIATION",
"ME_ENDPOINT",
"ME_CALLBACK",
"ME_CONNECTID",
"ME_CONNECTKEY",
"ME_CONNECTAUTH",
"ME_RESPONSE");
ENUM_END(notify_type_names, ME_RESPONSE);
ENUM_BEGIN(notify_type_short_names, UNSUPPORTED_CRITICAL_PAYLOAD, UNSUPPORTED_CRITICAL_PAYLOAD,
"CRIT");
ENUM_NEXT(notify_type_short_names, INVALID_IKE_SPI, INVALID_MAJOR_VERSION, UNSUPPORTED_CRITICAL_PAYLOAD,
"INVAL_IKE_SPI",
"INVAL_MAJOR");
ENUM_NEXT(notify_type_short_names, INVALID_SYNTAX, INVALID_SYNTAX, INVALID_MAJOR_VERSION,
"INVAL_SYN");
ENUM_NEXT(notify_type_short_names, INVALID_MESSAGE_ID, INVALID_MESSAGE_ID, INVALID_SYNTAX,
"INVAL_MID");
ENUM_NEXT(notify_type_short_names, INVALID_SPI, INVALID_SPI, INVALID_MESSAGE_ID,
"INVAL_SPI");
ENUM_NEXT(notify_type_short_names, NO_PROPOSAL_CHOSEN, NO_PROPOSAL_CHOSEN, INVALID_SPI,
"NO_PROP");
ENUM_NEXT(notify_type_short_names, INVALID_KE_PAYLOAD, INVALID_KE_PAYLOAD, NO_PROPOSAL_CHOSEN,
"INVAL_KE");
ENUM_NEXT(notify_type_short_names, AUTHENTICATION_FAILED, AUTHENTICATION_FAILED, INVALID_KE_PAYLOAD,
"AUTH_FAILED");
ENUM_NEXT(notify_type_short_names, SINGLE_PAIR_REQUIRED, CHILD_SA_NOT_FOUND, AUTHENTICATION_FAILED,
"SINGLE_PAIR",
"NO_ADD_SAS",
"INT_ADDR_FAIL",
"FAIL_CP_REQ",
"TS_UNACCEPT",
"INVAL_SEL",
"UNACCEPT_ADDR",
"UNEXPECT_NAT",
"ASSIGNED_HoA",
"TEMP_FAIL",
"NO_CHILD_SA");
ENUM_NEXT(notify_type_short_names, ME_CONNECT_FAILED, ME_CONNECT_FAILED, CHILD_SA_NOT_FOUND,
"ME_CONN_FAIL");
ENUM_NEXT(notify_type_short_names, INITIAL_CONTACT, EAP_ONLY_AUTHENTICATION, ME_CONNECT_FAILED,
"INIT_CONTACT",
"SET_WINSIZE",
"ADD_TS_POSS",
"IPCOMP_SUPP",
"NATD_S_IP",
"NATD_D_IP",
"COOKIE",
"USE_TRANSP",
"HTTP_CERT_LOOK",
"REKEY_SA",
"ESP_TFC_PAD_N",
"NON_FIRST_FRAG",
"MOBIKE_SUP",
"ADD_4_ADDR",
"ADD_6_ADDR",
"NO_ADD_ADDR",
"UPD_SA_ADDR",
"COOKIE2",
"NO_NATS",
"AUTH_LFT",
"MULT_AUTH",
"AUTH_FOLLOWS",
"REDIR_SUP",
"REDIR",
"REDIR_FROM",
"TKT_LT_OPAK",
"TKT_REQ",
"TKT_ACK",
"TKT_NACK",
"TKT_OPAK",
"LINK_ID",
"WESP_MODE",
"ROHC_SUP",
"EAP_ONLY");
ENUM_NEXT(notify_type_short_names, USE_BEET_MODE, USE_BEET_MODE, EAP_ONLY_AUTHENTICATION,
"BEET_MODE");
ENUM_NEXT(notify_type_short_names, ME_MEDIATION, ME_RESPONSE, USE_BEET_MODE,
"ME_MED",
"ME_EP",
"ME_CB",
"ME_CID",
"ME_CKEY",
"ME_CAUTH",
"ME_R");
ENUM_END(notify_type_short_names, ME_RESPONSE);
typedef struct private_notify_payload_t private_notify_payload_t;
/**
* Private data of an notify_payload_t object.
*
*/
struct private_notify_payload_t {
/**
* Public notify_payload_t interface.
*/
notify_payload_t public;
/**
* Next payload type.
*/
u_int8_t next_payload;
/**
* Critical flag.
*/
bool critical;
/**
* Length of this payload.
*/
u_int16_t payload_length;
/**
* Protocol id.
*/
u_int8_t protocol_id;
/**
* Spi size.
*/
u_int8_t spi_size;
/**
* Notify message type.
*/
u_int16_t notify_type;
/**
* Security parameter index (spi).
*/
chunk_t spi;
/**
* Notification data.
*/
chunk_t notification_data;
};
/**
* Encoding rules to parse or generate a IKEv2-Notify Payload.
*
* The defined offsets are the positions in a object of type
* private_notify_payload_t.
*
*/
encoding_rule_t notify_payload_encodings[] = {
/* 1 Byte next payload type, stored in the field next_payload */
{ U_INT_8, offsetof(private_notify_payload_t, next_payload) },
/* the critical bit */
{ FLAG, offsetof(private_notify_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_notify_payload_t, payload_length) },
/* Protocol ID as 8 bit field*/
{ U_INT_8, offsetof(private_notify_payload_t, protocol_id) },
/* SPI Size as 8 bit field*/
{ SPI_SIZE, offsetof(private_notify_payload_t, spi_size) },
/* Notify message type as 16 bit field*/
{ U_INT_16, offsetof(private_notify_payload_t, notify_type) },
/* SPI as variable length field*/
{ SPI, offsetof(private_notify_payload_t, spi) },
/* Key Exchange Data is from variable size */
{ NOTIFICATION_DATA, offsetof(private_notify_payload_t, notification_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 !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! Protocol ID ! SPI Size ! Notify Message Type !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Security Parameter Index (SPI) ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
! !
~ Notification Data ~
! !
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/**
* Implementation of payload_t.verify.
*/
static status_t verify(private_notify_payload_t *this)
{
bool bad_length = FALSE;
switch (this->protocol_id)
{
case PROTO_NONE:
case PROTO_IKE:
case PROTO_AH:
case PROTO_ESP:
break;
default:
DBG1(DBG_ENC, "Unknown protocol (%d)", this->protocol_id);
return FAILED;
}
switch (this->notify_type)
{
case INVALID_KE_PAYLOAD:
{
if (this->notification_data.len != 2)
{
bad_length = TRUE;
}
break;
}
case NAT_DETECTION_SOURCE_IP:
case NAT_DETECTION_DESTINATION_IP:
case ME_CONNECTAUTH:
{
if (this->notification_data.len != HASH_SIZE_SHA1)
{
bad_length = TRUE;
}
break;
}
case INVALID_SYNTAX:
case INVALID_MAJOR_VERSION:
case NO_PROPOSAL_CHOSEN:
{
if (this->notification_data.len != 0)
{
bad_length = TRUE;
}
break;
}
case ADDITIONAL_IP4_ADDRESS:
{
if (this->notification_data.len != 4)
{
bad_length = TRUE;
}
break;
}
case ADDITIONAL_IP6_ADDRESS:
{
if (this->notification_data.len != 16)
{
bad_length = TRUE;
}
break;
}
case AUTH_LIFETIME:
{
if (this->notification_data.len != 4)
{
bad_length = TRUE;
}
break;
}
case IPCOMP_SUPPORTED:
{
if (this->notification_data.len != 3)
{
bad_length = TRUE;
}
break;
}
case ME_ENDPOINT:
if (this->notification_data.len != 8 &&
this->notification_data.len != 12 &&
this->notification_data.len != 24)
{
bad_length = TRUE;
}
break;
case ME_CONNECTID:
if (this->notification_data.len < 4 ||
this->notification_data.len > 16)
{
bad_length = TRUE;
}
break;
case ME_CONNECTKEY:
if (this->notification_data.len < 16 ||
this->notification_data.len > 32)
{
bad_length = TRUE;
}
break;
default:
/* TODO: verify */
break;
}
if (bad_length)
{
DBG1(DBG_ENC, "invalid notify data length for %N (%d)",
notify_type_names, this->notify_type,
this->notification_data.len);
return FAILED;
}
return SUCCESS;
}
/**
* Implementation of payload_t.get_encoding_rules.
*/
static void get_encoding_rules(private_notify_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
{
*rules = notify_payload_encodings;
*rule_count = sizeof(notify_payload_encodings) / sizeof(encoding_rule_t);
}
/**
* Implementation of payload_t.get_type.
*/
static payload_type_t get_type(private_notify_payload_t *this)
{
return NOTIFY;
}
/**
* Implementation of payload_t.get_next_type.
*/
static payload_type_t get_next_type(private_notify_payload_t *this)
{
return (this->next_payload);
}
/**
* Implementation of payload_t.set_next_type.
*/
static void set_next_type(private_notify_payload_t *this,payload_type_t type)
{
this->next_payload = type;
}
/**
* recompute the payloads length.
*/
static void compute_length (private_notify_payload_t *this)
{
size_t length = NOTIFY_PAYLOAD_HEADER_LENGTH;
if (this->notification_data.ptr != NULL)
{
length += this->notification_data.len;
}
if (this->spi.ptr != NULL)
{
length += this->spi.len;
}
this->payload_length = length;
}
/**
* Implementation of payload_t.get_length.
*/
static size_t get_length(private_notify_payload_t *this)
{
compute_length(this);
return this->payload_length;
}
/**
* Implementation of notify_payload_t.get_protocol_id.
*/
static u_int8_t get_protocol_id(private_notify_payload_t *this)
{
return this->protocol_id;
}
/**
* Implementation of notify_payload_t.set_protocol_id.
*/
static void set_protocol_id(private_notify_payload_t *this, u_int8_t protocol_id)
{
this->protocol_id = protocol_id;
}
/**
* Implementation of notify_payload_t.get_notify_type.
*/
static notify_type_t get_notify_type(private_notify_payload_t *this)
{
return this->notify_type;
}
/**
* Implementation of notify_payload_t.set_notify_type.
*/
static void set_notify_type(private_notify_payload_t *this, u_int16_t notify_type)
{
this->notify_type = notify_type;
}
/**
* Implementation of notify_payload_t.get_spi.
*/
static u_int32_t get_spi(private_notify_payload_t *this)
{
switch (this->protocol_id)
{
case PROTO_AH:
case PROTO_ESP:
if (this->spi.len == 4)
{
return *((u_int32_t*)this->spi.ptr);
}
default:
break;
}
return 0;
}
/**
* Implementation of notify_payload_t.set_spi.
*/
static void set_spi(private_notify_payload_t *this, u_int32_t spi)
{
chunk_free(&this->spi);
switch (this->protocol_id)
{
case PROTO_AH:
case PROTO_ESP:
this->spi = chunk_alloc(4);
*((u_int32_t*)this->spi.ptr) = spi;
break;
default:
break;
}
this->spi_size = this->spi.len;
compute_length(this);
}
/**
* Implementation of notify_payload_t.get_notification_data.
*/
static chunk_t get_notification_data(private_notify_payload_t *this)
{
return (this->notification_data);
}
/**
* Implementation of notify_payload_t.set_notification_data.
*/
static status_t set_notification_data(private_notify_payload_t *this, chunk_t notification_data)
{
chunk_free(&this->notification_data);
if (notification_data.len > 0)
{
this->notification_data = chunk_clone(notification_data);
}
compute_length(this);
return SUCCESS;
}
/**
* Implementation of notify_payload_t.destroy and notify_payload_t.destroy.
*/
static status_t destroy(private_notify_payload_t *this)
{
chunk_free(&this->notification_data);
chunk_free(&this->spi);
free(this);
return SUCCESS;
}
/*
* Described in header
*/
notify_payload_t *notify_payload_create()
{
private_notify_payload_t *this = malloc_thing(private_notify_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_protocol_id = (u_int8_t (*) (notify_payload_t *)) get_protocol_id;
this->public.set_protocol_id = (void (*) (notify_payload_t *,u_int8_t)) set_protocol_id;
this->public.get_notify_type = (notify_type_t (*) (notify_payload_t *)) get_notify_type;
this->public.set_notify_type = (void (*) (notify_payload_t *,notify_type_t)) set_notify_type;
this->public.get_spi = (u_int32_t (*) (notify_payload_t *)) get_spi;
this->public.set_spi = (void (*) (notify_payload_t *,u_int32_t)) set_spi;
this->public.get_notification_data = (chunk_t (*) (notify_payload_t *)) get_notification_data;
this->public.set_notification_data = (void (*) (notify_payload_t *,chunk_t)) set_notification_data;
this->public.destroy = (void (*) (notify_payload_t *)) destroy;
/* set default values of the fields */
this->critical = FALSE;
this->next_payload = NO_PAYLOAD;
this->payload_length = NOTIFY_PAYLOAD_HEADER_LENGTH;
this->protocol_id = 0;
this->notify_type = 0;
this->spi.ptr = NULL;
this->spi.len = 0;
this->spi_size = 0;
this->notification_data.ptr = NULL;
this->notification_data.len = 0;
return &this->public;
}
/*
* Described in header.
*/
notify_payload_t *notify_payload_create_from_protocol_and_type(protocol_id_t protocol_id, notify_type_t notify_type)
{
notify_payload_t *notify = notify_payload_create();
notify->set_notify_type(notify,notify_type);
notify->set_protocol_id(notify,protocol_id);
return notify;
}
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