mirror of
https://github.com/lwip-tcpip/lwip.git
synced 2025-01-30 03:32:50 +00:00
Partly apply Elias Oenal's SNMP V3 patch, part 2: Add SNMPv3 support routines. Crypto does not work yet.
This commit is contained in:
Dirk Ziegelmeier
parent
d0c3baf340
commit
52fdc6bb3e
@ -135,6 +135,7 @@ SNMPFILES=$(LWIPDIR)/apps/snmp/snmp_asn1.c \
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$(LWIPDIR)/apps/snmp/snmp_mib2_tcp.c \
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$(LWIPDIR)/apps/snmp/snmp_mib2_udp.c \
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$(LWIPDIR)/apps/snmp/snmp_msg.c \
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$(LWIPDIR)/apps/snmp/snmpv3.c \
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$(LWIPDIR)/apps/snmp/snmp_netconn.c \
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$(LWIPDIR)/apps/snmp/snmp_pbuf_stream.c \
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$(LWIPDIR)/apps/snmp/snmp_raw.c \
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326
src/apps/snmp/snmpv3.c
Normal file
326
src/apps/snmp/snmpv3.c
Normal file
@ -0,0 +1,326 @@
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/**
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* @file
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* Additional SNMPv3 functionality RFC3414 and RFC3826.
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*/
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/*
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* Copyright (c) 2016 Elias Oenal.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Elias Oenal <lwip@eliasoenal.com>
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*/
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#include "snmpv3.h"
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#include "arch/cc.h"
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#include "snmp_msg.h"
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#include "lwip/sys.h"
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#include <string.h>
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#if LWIP_SNMP && LWIP_SNMP_V3
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#ifdef LWIP_SNMPV3_INCLUDE_ENGINE
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#include LWIP_SNMPV3_INCLUDE_ENGINE
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#endif
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#ifdef LWIP_SNMP_V3_CRYPTO
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#ifdef LWIP_INCLUDE_CRYPTO_LIB
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#include LWIP_INCLUDE_CRYPTO_LIB
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#endif
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#ifdef LWIP_INCLUDE_CRYPTO_MD5
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#include LWIP_INCLUDE_CRYPTO_MD5
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#endif
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#ifdef LWIP_INCLUDE_CRYPTO_SHA
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#include LWIP_INCLUDE_CRYPTO_SHA
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#endif
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#ifdef LWIP_INCLUDE_CRYPTO_DES
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#include LWIP_INCLUDE_CRYPTO_DES
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#endif
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#ifdef LWIP_INCLUDE_CRYPTO_AES
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#include LWIP_INCLUDE_CRYPTO_AES
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#endif
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#endif
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#ifdef LWIP_SNMP_V3_CRYPTO
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#if !defined(LWIP_MD5_HMAC_HANDLE) || !defined(LWIP_MD5_HMAC_INIT) || \
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!defined(LWIP_MD5_HMAC_UPDATE) || !defined(LWIP_MD5_HMAC_FINAL)
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#error LWIP_SNMP_V3_CRYPTO requires MD5 HMAC
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#endif
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#if !defined(LWIP_SHA_HMAC_HANDLE) || !defined(LWIP_SHA_HMAC_INIT) || \
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!defined(LWIP_SHA_HMAC_UPDATE) || !defined(LWIP_SHA_HMAC_FINAL)
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#error LWIP_SNMP_V3_CRYPTO requires SHA HMAC
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#endif
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#if !defined(LWIP_DES_CBC_ENCRYPT_HANDLE) || !defined(LWIP_DES_CBC_ENCRYPT_INIT) || \
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!defined(LWIP_DES_CBC_ENCRYPT_UPDATE) || !defined(LWIP_DES_CBC_ENCRYPT_FINAL) || \
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!defined(LWIP_DES_CBC_DECRYPT_HANDLE) || !defined(LWIP_DES_CBC_DECRYPT_INIT) || \
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!defined(LWIP_DES_CBC_DECRYPT_UPDATE) || !defined(LWIP_DES_CBC_DECRYPT_FINAL)
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#error LWIP_SNMP_V3_CRYPTO requires DES CBC
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#endif
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#if !defined(LWIP_AES_CFB_ENCRYPT_HANDLE) || !defined(LWIP_AES_CFB_ENCRYPT_INIT) || \
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!defined(LWIP_AES_CFB_ENCRYPT_UPDATE) || !defined(LWIP_AES_CFB_ENCRYPT_FINAL) || \
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!defined(LWIP_AES_CFB_DECRYPT_HANDLE) || !defined(LWIP_AES_CFB_DECRYPT_INIT) || \
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!defined(LWIP_AES_CFB_DECRYPT_UPDATE) || !defined(LWIP_AES_CFB_DECRYPT_FINAL)
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#error LWIP_SNMP_V3_CRYPTO requires AES CFB
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#endif
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#endif
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#define SNMP_MAX_TIME_BOOT 2147483647UL
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/* Engine ID, as specified in RFC3411 */
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const char*
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snmpv3_get_engine_id(void)
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{
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return LWIP_SNMPV3_GET_ENGINE_ID();
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}
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/* Has to reset boots, see below */
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void
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snmpv3_engine_id_changed(void)
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{
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LWIP_SNMPV3_SET_ENGINE_BOOTS(0);
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}
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/* According to RFC3414 2.2.2.
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*
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* The number of times that the SNMP engine has
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* (re-)initialized itself since snmpEngineID
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* was last configured.
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*/
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u32_t
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snmpv3_get_engine_boots(void)
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{
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if (LWIP_SNMPV3_GET_ENGINE_BOOTS() == 0 ||
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LWIP_SNMPV3_GET_ENGINE_BOOTS() < SNMP_MAX_TIME_BOOT) {
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return LWIP_SNMPV3_GET_ENGINE_BOOTS();
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}
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LWIP_SNMPV3_SET_ENGINE_BOOTS(SNMP_MAX_TIME_BOOT);
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return LWIP_SNMPV3_GET_ENGINE_BOOTS();
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}
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/* RFC3414 2.2.2.
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*
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* Once the timer reaches 2147483647 it gets reset to zero and the
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* engine boot ups get incremented.
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*/
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u32_t
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snmpv3_get_engine_time(void)
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{
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if (LWIP_SNMPV3_GET_ENGINE_TIME() >= SNMP_MAX_TIME_BOOT) {
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LWIP_SNMPV3_RESET_ENGINE_TIME();
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if (LWIP_SNMPV3_GET_ENGINE_BOOTS() < SNMP_MAX_TIME_BOOT - 1) {
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LWIP_SNMPV3_SET_ENGINE_BOOTS(LWIP_SNMPV3_GET_ENGINE_BOOTS() + 1);
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} else {
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LWIP_SNMPV3_SET_ENGINE_BOOTS(SNMP_MAX_TIME_BOOT);
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}
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}
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return LWIP_SNMPV3_GET_ENGINE_TIME();
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}
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#ifdef LWIP_SNMP_V3_CRYPTO
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err_t
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snmpv3_auth(struct snmp_pbuf_stream* stream, u16_t length,
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const u8_t* key, u8_t algo, u8_t* hmac_out)
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{
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u32_t i;
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u8_t byte;
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struct snmp_pbuf_stream read_stream;
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snmp_pbuf_stream_init(&read_stream, stream->pbuf, stream->offset,
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stream->length);
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if (algo == SNMP_V3_AUTH_ALGO_MD5) {
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LWIP_MD5_HMAC_HANDLE mh;
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if (LWIP_MD5_HMAC_INIT(&mh, key, SNMP_V3_MD5_LEN))
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return ERR_ARG;
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for (i = 0; i < length; i++) {
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if (snmp_pbuf_stream_read(&read_stream, &byte))
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return ERR_ARG;
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if (LWIP_MD5_HMAC_UPDATE(&mh, &byte, 1))
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return ERR_ARG;
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}
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if (LWIP_MD5_HMAC_FINAL(&mh, hmac_out))
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return ERR_ARG;
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} else if (algo == SNMP_V3_AUTH_ALGO_SHA) {
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LWIP_SHA_HMAC_HANDLE sh;
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if (LWIP_SHA_HMAC_INIT(&sh, key, SNMP_V3_SHA_LEN))
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return ERR_ARG;
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for (i = 0; i < length; i++) {
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if (snmp_pbuf_stream_read(&read_stream, &byte))
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return ERR_ARG;
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if (LWIP_SHA_HMAC_UPDATE(&sh, &byte, 1))
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return ERR_ARG;
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}
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if (LWIP_SHA_HMAC_FINAL(&sh, hmac_out))
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return ERR_ARG;
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} else
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return ERR_ARG;
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return ERR_OK;
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}
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err_t
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snmpv3_crypt(struct snmp_pbuf_stream* stream, u16_t length,
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const u8_t* key, const u8_t* priv_param, const u32_t engine_boots,
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const u32_t engine_time, u8_t algo, u8_t mode)
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{
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u8_t in_bytes[8];
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u8_t out_bytes[8];
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u8_t iv_local[16];
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u32_t i, j;
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/* RFC 3414 mandates padding for DES */
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if (algo == SNMP_V3_PRIV_ALGO_DES) {
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if (length % 8)
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return ERR_ARG;
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for (i = 0; i < 8; i++)
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iv_local[i] = priv_param[i] ^ key[i + 8];
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} else if (algo == SNMP_V3_PRIV_ALGO_AES) {
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/*
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* IV is the big endian concatenation of boots,
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* uptime and priv param - see RFC3826.
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*/
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iv_local[0 + 0] = (engine_boots >> 24) & 0xFF;
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iv_local[0 + 1] = (engine_boots >> 16) & 0xFF;
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iv_local[0 + 2] = (engine_boots >> 8) & 0xFF;
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iv_local[0 + 3] = (engine_boots >> 0) & 0xFF;
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iv_local[4 + 0] = (engine_time >> 24) & 0xFF;
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iv_local[4 + 1] = (engine_time >> 16) & 0xFF;
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iv_local[4 + 2] = (engine_time >> 8) & 0xFF;
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iv_local[4 + 3] = (engine_time >> 0) & 0xFF;
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memcpy(iv_local + 8, priv_param, 8);
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}
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struct snmp_pbuf_stream read_stream;
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struct snmp_pbuf_stream write_stream;
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snmp_pbuf_stream_init(&read_stream, stream->pbuf, stream->offset,
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stream->length);
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snmp_pbuf_stream_init(&write_stream, stream->pbuf, stream->offset,
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stream->length);
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if (algo == SNMP_V3_PRIV_ALGO_DES && mode == SNMP_V3_PRIV_MODE_ENCRYPT) {
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LWIP_DES_CBC_ENCRYPT_HANDLE handle;
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LWIP_DES_CBC_ENCRYPT_INIT(&handle, key);
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for (i = 0; i < length; i += 8) {
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for (j = 0; j < 8; j++)
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snmp_pbuf_stream_read(&read_stream, &in_bytes[j]);
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LWIP_DES_CBC_ENCRYPT_UPDATE(&handle, 8, iv_local, in_bytes, out_bytes);
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for (j = 0; j < 8; j++)
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snmp_pbuf_stream_write(&write_stream, out_bytes[j]);
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}
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LWIP_DES_CBC_ENCRYPT_FINAL(&handle);
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} else if (algo == SNMP_V3_PRIV_ALGO_DES && mode == SNMP_V3_PRIV_MODE_DECRYPT) {
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LWIP_DES_CBC_DECRYPT_HANDLE handle;
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LWIP_DES_CBC_DECRYPT_INIT(&handle, key);
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for (i = 0; i < length; i += 8) {
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for (j = 0; j < 8; j++)
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snmp_pbuf_stream_read(&read_stream, &in_bytes[j]);
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LWIP_DES_CBC_DECRYPT_UPDATE(&handle, 8, iv_local, in_bytes, out_bytes);
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for (j = 0; j < 8; j++)
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snmp_pbuf_stream_write(&write_stream, out_bytes[j]);
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}
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LWIP_DES_CBC_DECRYPT_FINAL(&handle);
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} else if (algo == SNMP_V3_PRIV_ALGO_AES && mode == SNMP_V3_PRIV_MODE_ENCRYPT) {
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size_t iv_offset = 0;
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LWIP_AES_CFB_ENCRYPT_HANDLE handle;
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LWIP_AES_CFB_ENCRYPT_INIT(&handle, key);
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for (i = 0; i < length; i++) {
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snmp_pbuf_stream_read(&read_stream, &in_bytes[0]);
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LWIP_AES_CFB_ENCRYPT_UPDATE(&handle, 1, &iv_offset, iv_local, in_bytes,
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out_bytes);
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snmp_pbuf_stream_write(&write_stream, out_bytes[0]);
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}
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LWIP_AES_CFB_ENCRYPT_FINAL(&handle);
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} else if (algo == SNMP_V3_PRIV_ALGO_AES && mode == SNMP_V3_PRIV_MODE_DECRYPT) {
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size_t iv_off = 0;
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LWIP_AES_CFB_DECRYPT_HANDLE handle;
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LWIP_AES_CFB_DECRYPT_INIT(&handle, key);
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for (i = 0; i < length; i++) {
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snmp_pbuf_stream_read(&read_stream, &in_bytes[0]);
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LWIP_AES_CFB_DECRYPT_UPDATE(&handle, 1, &iv_off, iv_local, in_bytes,
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out_bytes);
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snmp_pbuf_stream_write(&write_stream, out_bytes[0]);
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}
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LWIP_AES_CFB_DECRYPT_FINAL(&handle);
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} else
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return ERR_ARG;
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return ERR_OK;
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}
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/* This function ignores the byte order suggestion in RFC3414
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* since it simply doesn't influence the effectiveness of an IV.
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*
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* Implementing RFC3826 priv param algorithm if LWIP_RAND is available.
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*
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* TODO: This is a potential thread safety issue.
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*/
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err_t
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snmpv3_build_priv_param(u8_t* priv_param)
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{
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#ifdef LWIP_RAND /* Based on RFC3826 */
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static u8_t init;
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static u32_t priv1, priv2;
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/* Lazy initialisation */
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if (init == 0) {
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init = 1;
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priv1 = LWIP_RAND();
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priv2 = LWIP_RAND();
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}
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memcpy(&priv_param[0], &priv1, sizeof(priv1));
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memcpy(&priv_param[4], &priv2, sizeof(priv2));
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/* Emulate 64bit increment */
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priv1++;
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if (!priv1) /* Overflow */
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priv2++;
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#else /* Based on RFC3414 */
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static u32_t ctr;
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u32_t boots = LWIP_SNMPV3_GET_ENGINE_BOOTS();
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memcpy(&priv_param[0], &boots, 4);
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memcpy(&priv_param[4], &ctr, 4);
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ctr++;
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#endif
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return ERR_OK;
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}
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#endif /* LWIP_SNMP_V3_CRYPTO */
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#endif
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124
src/apps/snmp/snmpv3.h
Normal file
124
src/apps/snmp/snmpv3.h
Normal file
@ -0,0 +1,124 @@
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/**
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* @file
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* Additional SNMPv3 functionality RFC3414 and RFC3826.
|
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*/
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|
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/*
|
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* Copyright (c) 2016 Elias Oenal.
|
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* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without modification,
|
||||
* are permitted provided that the following conditions are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright notice,
|
||||
* this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
||||
* this list of conditions and the following disclaimer in the documentation
|
||||
* and/or other materials provided with the distribution.
|
||||
* 3. The name of the author may not be used to endorse or promote products
|
||||
* derived from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
||||
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
|
||||
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||||
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
||||
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
||||
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
|
||||
* OF SUCH DAMAGE.
|
||||
*
|
||||
* Author: Elias Oenal <lwip@eliasoenal.com>
|
||||
*/
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|
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#ifndef LWIP_HDR_APPS_SNMP_V3_H
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#define LWIP_HDR_APPS_SNMP_V3_H
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#include "lwip/apps/snmp_opts.h"
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#if LWIP_SNMP && LWIP_SNMP_V3
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#include "snmp_pbuf_stream.h"
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#ifndef LWIP_SNMPV3_GET_ENGINE_BOOTS
|
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/* #warning RFC3414 complicance requires a persistent boot count */
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#define LWIP_SNMPV3_GET_ENGINE_BOOTS() 0
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#endif
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#ifndef LWIP_SNMPV3_SET_ENGINE_BOOTS
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/* #warning RFC3414 complicance requires a method to set boot count */
|
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#define LWIP_SNMPV3_SET_ENGINE_BOOTS(val)
|
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#endif
|
||||
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#ifndef LWIP_SNMPV3_GET_ENGINE_TIME
|
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/* #warning RFC3414 complicance requires the uptime to count until 2147483647 */
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#define LWIP_SNMPV3_GET_ENGINE_TIME() (sys_now() / 10)
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#endif
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|
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#ifndef LWIP_SNMPV3_RESET_ENGINE_TIME
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/* #warning RFC3414 complicance requires a method to reset uptime */
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#define LWIP_SNMPV3_RESET_ENGINE_TIME()
|
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#endif
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#ifndef LWIP_SNMPV3_GET_ENGINE_ID
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/* #warning RFC3414 complicance requires an engine ID */
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||||
/* Using the one from the test vectors from RFC3414 */
|
||||
#define LWIP_SNMPV3_GET_ENGINE_ID() "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02"
|
||||
#endif
|
||||
|
||||
#ifndef LWIP_SNMPV3_GET_ENGINE_ID_LEN
|
||||
/* #warning RFC3414 complicance requires an engine ID */
|
||||
#define LWIP_SNMPV3_GET_ENGINE_ID_LEN() 12
|
||||
#endif
|
||||
|
||||
#ifndef LWIP_SNMPV3_GET_USER
|
||||
/* #warning Implement user handling */
|
||||
/* @param username is a pointer to a string.
|
||||
* @param auth_algo is a pointer to u8_t. The implementation has to set this if user was found.
|
||||
* @param auth_key is a pointer to a pointer to a string. Implementation has to set this if user was found.
|
||||
* @param priv_algo is a pointer to u8_t. The implementation has to set this if user was found.
|
||||
* @param priv_key is a pointer to a pointer to a string. Implementation has to set this if user was found.
|
||||
*/
|
||||
/* Dummy implementation, pretend the user was found if cryptography isn't used */
|
||||
#define LWIP_SNMPV3_GET_USER(username, auth_algo, auth_key, priv_algo, priv_key) ((auth_algo || auth_key \
|
||||
|| priv_algo || priv_key)?1:0)
|
||||
#endif
|
||||
|
||||
/* According to RFC 3411 */
|
||||
#define SNMP_V3_MAX_ENGINE_ID_LENGTH 32
|
||||
#define SNMP_V3_MAX_USER_LENGTH 32
|
||||
|
||||
#define SNMP_V3_MAX_AUTH_PARAM_LENGTH 12
|
||||
#define SNMP_V3_MAX_PRIV_PARAM_LENGTH 8
|
||||
|
||||
#define SNMP_V3_AUTH_FLAG 0x01
|
||||
#define SNMP_V3_PRIV_FLAG 0x02
|
||||
|
||||
#define SNMP_V3_MD5_LEN 16
|
||||
#define SNMP_V3_SHA_LEN 20
|
||||
|
||||
#define SNMP_V3_AUTH_ALGO_INVAL 0
|
||||
#define SNMP_V3_AUTH_ALGO_MD5 1
|
||||
#define SNMP_V3_AUTH_ALGO_SHA 2
|
||||
|
||||
#define SNMP_V3_PRIV_ALGO_INVAL 0
|
||||
#define SNMP_V3_PRIV_ALGO_DES 1
|
||||
#define SNMP_V3_PRIV_ALGO_AES 2
|
||||
|
||||
#define SNMP_V3_PRIV_MODE_DECRYPT 0
|
||||
#define SNMP_V3_PRIV_MODE_ENCRYPT 1
|
||||
|
||||
const char* snmpv3_get_engine_id(void);
|
||||
void snmpv3_set_engine_id(const char* id);
|
||||
u32_t snmpv3_get_engine_boots(void);
|
||||
u32_t snmpv3_get_engine_time(void);
|
||||
void snmpv3_engine_id_changed(void);
|
||||
err_t snmpv3_auth(struct snmp_pbuf_stream* stream, u16_t length, const u8_t* key, u8_t algo, u8_t* hmac_out);
|
||||
err_t snmpv3_crypt(struct snmp_pbuf_stream* stream, u16_t length, const u8_t* key,
|
||||
const u8_t* priv_param, const u32_t engine_boots, const u32_t engine_time, u8_t algo, u8_t mode);
|
||||
err_t snmpv3_build_priv_param(u8_t* priv_param);
|
||||
|
||||
#endif
|
||||
|
||||
#endif /* LWIP_HDR_APPS_SNMP_V3_H */
|
||||
Loading…
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Reference in New Issue
Block a user