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Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

features/mbedtls/src/ssl_cookie.c@1:f30bdcd2b33b, 2017-02-27 (annotated)

Committer:
jacobjohnson
Date:
Mon Feb 27 17:45:05 2017 +0000
Revision:
1:f30bdcd2b33b
Parent:
0:098463de4c5d 
changed the inputscale from 1 to 7 in analogin_api.c.  This will need to be changed later, and accessed from the main level, but for now this allows the  adc to read a value from 0 to 3.7V, instead of just up to 1V.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /*
group-onsemi 0:098463de4c5d 2 * DTLS cookie callbacks implementation
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
group-onsemi 0:098463de4c5d 5 * SPDX-License-Identifier: Apache-2.0
group-onsemi 0:098463de4c5d 6 *
group-onsemi 0:098463de4c5d 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
group-onsemi 0:098463de4c5d 8 * not use this file except in compliance with the License.
group-onsemi 0:098463de4c5d 9 * You may obtain a copy of the License at
group-onsemi 0:098463de4c5d 10 *
group-onsemi 0:098463de4c5d 11 * http://www.apache.org/licenses/LICENSE-2.0
group-onsemi 0:098463de4c5d 12 *
group-onsemi 0:098463de4c5d 13 * Unless required by applicable law or agreed to in writing, software
group-onsemi 0:098463de4c5d 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
group-onsemi 0:098463de4c5d 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-onsemi 0:098463de4c5d 16 * See the License for the specific language governing permissions and
group-onsemi 0:098463de4c5d 17 * limitations under the License.
group-onsemi 0:098463de4c5d 18 *
group-onsemi 0:098463de4c5d 19 * This file is part of mbed TLS (https://tls.mbed.org)
group-onsemi 0:098463de4c5d 20 */
group-onsemi 0:098463de4c5d 21 /*
group-onsemi 0:098463de4c5d 22 * These session callbacks use a simple chained list
group-onsemi 0:098463de4c5d 23 * to store and retrieve the session information.
group-onsemi 0:098463de4c5d 24 */
group-onsemi 0:098463de4c5d 25
group-onsemi 0:098463de4c5d 26 #if !defined(MBEDTLS_CONFIG_FILE)
group-onsemi 0:098463de4c5d 27 #include "mbedtls/config.h"
group-onsemi 0:098463de4c5d 28 #else
group-onsemi 0:098463de4c5d 29 #include MBEDTLS_CONFIG_FILE
group-onsemi 0:098463de4c5d 30 #endif
group-onsemi 0:098463de4c5d 31
group-onsemi 0:098463de4c5d 32 #if defined(MBEDTLS_SSL_COOKIE_C)
group-onsemi 0:098463de4c5d 33
group-onsemi 0:098463de4c5d 34 #if defined(MBEDTLS_PLATFORM_C)
group-onsemi 0:098463de4c5d 35 #include "mbedtls/platform.h"
group-onsemi 0:098463de4c5d 36 #else
group-onsemi 0:098463de4c5d 37 #define mbedtls_calloc calloc
group-onsemi 0:098463de4c5d 38 #define mbedtls_free free
group-onsemi 0:098463de4c5d 39 #endif
group-onsemi 0:098463de4c5d 40
group-onsemi 0:098463de4c5d 41 #include "mbedtls/ssl_cookie.h"
group-onsemi 0:098463de4c5d 42 #include "mbedtls/ssl_internal.h"
group-onsemi 0:098463de4c5d 43
group-onsemi 0:098463de4c5d 44 #include <string.h>
group-onsemi 0:098463de4c5d 45
group-onsemi 0:098463de4c5d 46 /* Implementation that should never be optimized out by the compiler */
group-onsemi 0:098463de4c5d 47 static void mbedtls_zeroize( void *v, size_t n ) {
group-onsemi 0:098463de4c5d 48 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
group-onsemi 0:098463de4c5d 49 }
group-onsemi 0:098463de4c5d 50
group-onsemi 0:098463de4c5d 51 /*
group-onsemi 0:098463de4c5d 52 * If DTLS is in use, then at least one of SHA-1, SHA-256, SHA-512 is
group-onsemi 0:098463de4c5d 53 * available. Try SHA-256 first, 512 wastes resources since we need to stay
group-onsemi 0:098463de4c5d 54 * with max 32 bytes of cookie for DTLS 1.0
group-onsemi 0:098463de4c5d 55 */
group-onsemi 0:098463de4c5d 56 #if defined(MBEDTLS_SHA256_C)
group-onsemi 0:098463de4c5d 57 #define COOKIE_MD MBEDTLS_MD_SHA224
group-onsemi 0:098463de4c5d 58 #define COOKIE_MD_OUTLEN 32
group-onsemi 0:098463de4c5d 59 #define COOKIE_HMAC_LEN 28
group-onsemi 0:098463de4c5d 60 #elif defined(MBEDTLS_SHA512_C)
group-onsemi 0:098463de4c5d 61 #define COOKIE_MD MBEDTLS_MD_SHA384
group-onsemi 0:098463de4c5d 62 #define COOKIE_MD_OUTLEN 48
group-onsemi 0:098463de4c5d 63 #define COOKIE_HMAC_LEN 28
group-onsemi 0:098463de4c5d 64 #elif defined(MBEDTLS_SHA1_C)
group-onsemi 0:098463de4c5d 65 #define COOKIE_MD MBEDTLS_MD_SHA1
group-onsemi 0:098463de4c5d 66 #define COOKIE_MD_OUTLEN 20
group-onsemi 0:098463de4c5d 67 #define COOKIE_HMAC_LEN 20
group-onsemi 0:098463de4c5d 68 #else
group-onsemi 0:098463de4c5d 69 #error "DTLS hello verify needs SHA-1 or SHA-2"
group-onsemi 0:098463de4c5d 70 #endif
group-onsemi 0:098463de4c5d 71
group-onsemi 0:098463de4c5d 72 /*
group-onsemi 0:098463de4c5d 73 * Cookies are formed of a 4-bytes timestamp (or serial number) and
group-onsemi 0:098463de4c5d 74 * an HMAC of timestemp and client ID.
group-onsemi 0:098463de4c5d 75 */
group-onsemi 0:098463de4c5d 76 #define COOKIE_LEN ( 4 + COOKIE_HMAC_LEN )
group-onsemi 0:098463de4c5d 77
group-onsemi 0:098463de4c5d 78 void mbedtls_ssl_cookie_init( mbedtls_ssl_cookie_ctx *ctx )
group-onsemi 0:098463de4c5d 79 {
group-onsemi 0:098463de4c5d 80 mbedtls_md_init( &ctx->hmac_ctx );
group-onsemi 0:098463de4c5d 81 #if !defined(MBEDTLS_HAVE_TIME)
group-onsemi 0:098463de4c5d 82 ctx->serial = 0;
group-onsemi 0:098463de4c5d 83 #endif
group-onsemi 0:098463de4c5d 84 ctx->timeout = MBEDTLS_SSL_COOKIE_TIMEOUT;
group-onsemi 0:098463de4c5d 85
group-onsemi 0:098463de4c5d 86 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 87 mbedtls_mutex_init( &ctx->mutex );
group-onsemi 0:098463de4c5d 88 #endif
group-onsemi 0:098463de4c5d 89 }
group-onsemi 0:098463de4c5d 90
group-onsemi 0:098463de4c5d 91 void mbedtls_ssl_cookie_set_timeout( mbedtls_ssl_cookie_ctx *ctx, unsigned long delay )
group-onsemi 0:098463de4c5d 92 {
group-onsemi 0:098463de4c5d 93 ctx->timeout = delay;
group-onsemi 0:098463de4c5d 94 }
group-onsemi 0:098463de4c5d 95
group-onsemi 0:098463de4c5d 96 void mbedtls_ssl_cookie_free( mbedtls_ssl_cookie_ctx *ctx )
group-onsemi 0:098463de4c5d 97 {
group-onsemi 0:098463de4c5d 98 mbedtls_md_free( &ctx->hmac_ctx );
group-onsemi 0:098463de4c5d 99
group-onsemi 0:098463de4c5d 100 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 101 mbedtls_mutex_init( &ctx->mutex );
group-onsemi 0:098463de4c5d 102 #endif
group-onsemi 0:098463de4c5d 103
group-onsemi 0:098463de4c5d 104 mbedtls_zeroize( ctx, sizeof( mbedtls_ssl_cookie_ctx ) );
group-onsemi 0:098463de4c5d 105 }
group-onsemi 0:098463de4c5d 106
group-onsemi 0:098463de4c5d 107 int mbedtls_ssl_cookie_setup( mbedtls_ssl_cookie_ctx *ctx,
group-onsemi 0:098463de4c5d 108 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 109 void *p_rng )
group-onsemi 0:098463de4c5d 110 {
group-onsemi 0:098463de4c5d 111 int ret;
group-onsemi 0:098463de4c5d 112 unsigned char key[COOKIE_MD_OUTLEN];
group-onsemi 0:098463de4c5d 113
group-onsemi 0:098463de4c5d 114 if( ( ret = f_rng( p_rng, key, sizeof( key ) ) ) != 0 )
group-onsemi 0:098463de4c5d 115 return( ret );
group-onsemi 0:098463de4c5d 116
group-onsemi 0:098463de4c5d 117 ret = mbedtls_md_setup( &ctx->hmac_ctx, mbedtls_md_info_from_type( COOKIE_MD ), 1 );
group-onsemi 0:098463de4c5d 118 if( ret != 0 )
group-onsemi 0:098463de4c5d 119 return( ret );
group-onsemi 0:098463de4c5d 120
group-onsemi 0:098463de4c5d 121 ret = mbedtls_md_hmac_starts( &ctx->hmac_ctx, key, sizeof( key ) );
group-onsemi 0:098463de4c5d 122 if( ret != 0 )
group-onsemi 0:098463de4c5d 123 return( ret );
group-onsemi 0:098463de4c5d 124
group-onsemi 0:098463de4c5d 125 mbedtls_zeroize( key, sizeof( key ) );
group-onsemi 0:098463de4c5d 126
group-onsemi 0:098463de4c5d 127 return( 0 );
group-onsemi 0:098463de4c5d 128 }
group-onsemi 0:098463de4c5d 129
group-onsemi 0:098463de4c5d 130 /*
group-onsemi 0:098463de4c5d 131 * Generate the HMAC part of a cookie
group-onsemi 0:098463de4c5d 132 */
group-onsemi 0:098463de4c5d 133 static int ssl_cookie_hmac( mbedtls_md_context_t *hmac_ctx,
group-onsemi 0:098463de4c5d 134 const unsigned char time[4],
group-onsemi 0:098463de4c5d 135 unsigned char **p, unsigned char *end,
group-onsemi 0:098463de4c5d 136 const unsigned char *cli_id, size_t cli_id_len )
group-onsemi 0:098463de4c5d 137 {
group-onsemi 0:098463de4c5d 138 unsigned char hmac_out[COOKIE_MD_OUTLEN];
group-onsemi 0:098463de4c5d 139
group-onsemi 0:098463de4c5d 140 if( (size_t)( end - *p ) < COOKIE_HMAC_LEN )
group-onsemi 0:098463de4c5d 141 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
group-onsemi 0:098463de4c5d 142
group-onsemi 0:098463de4c5d 143 if( mbedtls_md_hmac_reset( hmac_ctx ) != 0 ||
group-onsemi 0:098463de4c5d 144 mbedtls_md_hmac_update( hmac_ctx, time, 4 ) != 0 ||
group-onsemi 0:098463de4c5d 145 mbedtls_md_hmac_update( hmac_ctx, cli_id, cli_id_len ) != 0 ||
group-onsemi 0:098463de4c5d 146 mbedtls_md_hmac_finish( hmac_ctx, hmac_out ) != 0 )
group-onsemi 0:098463de4c5d 147 {
group-onsemi 0:098463de4c5d 148 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
group-onsemi 0:098463de4c5d 149 }
group-onsemi 0:098463de4c5d 150
group-onsemi 0:098463de4c5d 151 memcpy( *p, hmac_out, COOKIE_HMAC_LEN );
group-onsemi 0:098463de4c5d 152 *p += COOKIE_HMAC_LEN;
group-onsemi 0:098463de4c5d 153
group-onsemi 0:098463de4c5d 154 return( 0 );
group-onsemi 0:098463de4c5d 155 }
group-onsemi 0:098463de4c5d 156
group-onsemi 0:098463de4c5d 157 /*
group-onsemi 0:098463de4c5d 158 * Generate cookie for DTLS ClientHello verification
group-onsemi 0:098463de4c5d 159 */
group-onsemi 0:098463de4c5d 160 int mbedtls_ssl_cookie_write( void *p_ctx,
group-onsemi 0:098463de4c5d 161 unsigned char **p, unsigned char *end,
group-onsemi 0:098463de4c5d 162 const unsigned char *cli_id, size_t cli_id_len )
group-onsemi 0:098463de4c5d 163 {
group-onsemi 0:098463de4c5d 164 int ret;
group-onsemi 0:098463de4c5d 165 mbedtls_ssl_cookie_ctx *ctx = (mbedtls_ssl_cookie_ctx *) p_ctx;
group-onsemi 0:098463de4c5d 166 unsigned long t;
group-onsemi 0:098463de4c5d 167
group-onsemi 0:098463de4c5d 168 if( ctx == NULL || cli_id == NULL )
group-onsemi 0:098463de4c5d 169 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 170
group-onsemi 0:098463de4c5d 171 if( (size_t)( end - *p ) < COOKIE_LEN )
group-onsemi 0:098463de4c5d 172 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
group-onsemi 0:098463de4c5d 173
group-onsemi 0:098463de4c5d 174 #if defined(MBEDTLS_HAVE_TIME)
group-onsemi 0:098463de4c5d 175 t = (unsigned long) mbedtls_time( NULL );
group-onsemi 0:098463de4c5d 176 #else
group-onsemi 0:098463de4c5d 177 t = ctx->serial++;
group-onsemi 0:098463de4c5d 178 #endif
group-onsemi 0:098463de4c5d 179
group-onsemi 0:098463de4c5d 180 (*p)[0] = (unsigned char)( t >> 24 );
group-onsemi 0:098463de4c5d 181 (*p)[1] = (unsigned char)( t >> 16 );
group-onsemi 0:098463de4c5d 182 (*p)[2] = (unsigned char)( t >> 8 );
group-onsemi 0:098463de4c5d 183 (*p)[3] = (unsigned char)( t );
group-onsemi 0:098463de4c5d 184 *p += 4;
group-onsemi 0:098463de4c5d 185
group-onsemi 0:098463de4c5d 186 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 187 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
group-onsemi 0:098463de4c5d 188 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR + ret );
group-onsemi 0:098463de4c5d 189 #endif
group-onsemi 0:098463de4c5d 190
group-onsemi 0:098463de4c5d 191 ret = ssl_cookie_hmac( &ctx->hmac_ctx, *p - 4,
group-onsemi 0:098463de4c5d 192 p, end, cli_id, cli_id_len );
group-onsemi 0:098463de4c5d 193
group-onsemi 0:098463de4c5d 194 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 195 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
group-onsemi 0:098463de4c5d 196 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR +
group-onsemi 0:098463de4c5d 197 MBEDTLS_ERR_THREADING_MUTEX_ERROR );
group-onsemi 0:098463de4c5d 198 #endif
group-onsemi 0:098463de4c5d 199
group-onsemi 0:098463de4c5d 200 return( ret );
group-onsemi 0:098463de4c5d 201 }
group-onsemi 0:098463de4c5d 202
group-onsemi 0:098463de4c5d 203 /*
group-onsemi 0:098463de4c5d 204 * Check a cookie
group-onsemi 0:098463de4c5d 205 */
group-onsemi 0:098463de4c5d 206 int mbedtls_ssl_cookie_check( void *p_ctx,
group-onsemi 0:098463de4c5d 207 const unsigned char *cookie, size_t cookie_len,
group-onsemi 0:098463de4c5d 208 const unsigned char *cli_id, size_t cli_id_len )
group-onsemi 0:098463de4c5d 209 {
group-onsemi 0:098463de4c5d 210 unsigned char ref_hmac[COOKIE_HMAC_LEN];
group-onsemi 0:098463de4c5d 211 int ret = 0;
group-onsemi 0:098463de4c5d 212 unsigned char *p = ref_hmac;
group-onsemi 0:098463de4c5d 213 mbedtls_ssl_cookie_ctx *ctx = (mbedtls_ssl_cookie_ctx *) p_ctx;
group-onsemi 0:098463de4c5d 214 unsigned long cur_time, cookie_time;
group-onsemi 0:098463de4c5d 215
group-onsemi 0:098463de4c5d 216 if( ctx == NULL || cli_id == NULL )
group-onsemi 0:098463de4c5d 217 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 218
group-onsemi 0:098463de4c5d 219 if( cookie_len != COOKIE_LEN )
group-onsemi 0:098463de4c5d 220 return( -1 );
group-onsemi 0:098463de4c5d 221
group-onsemi 0:098463de4c5d 222 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 223 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
group-onsemi 0:098463de4c5d 224 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR + ret );
group-onsemi 0:098463de4c5d 225 #endif
group-onsemi 0:098463de4c5d 226
group-onsemi 0:098463de4c5d 227 if( ssl_cookie_hmac( &ctx->hmac_ctx, cookie,
group-onsemi 0:098463de4c5d 228 &p, p + sizeof( ref_hmac ),
group-onsemi 0:098463de4c5d 229 cli_id, cli_id_len ) != 0 )
group-onsemi 0:098463de4c5d 230 ret = -1;
group-onsemi 0:098463de4c5d 231
group-onsemi 0:098463de4c5d 232 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 233 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
group-onsemi 0:098463de4c5d 234 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR +
group-onsemi 0:098463de4c5d 235 MBEDTLS_ERR_THREADING_MUTEX_ERROR );
group-onsemi 0:098463de4c5d 236 #endif
group-onsemi 0:098463de4c5d 237
group-onsemi 0:098463de4c5d 238 if( ret != 0 )
group-onsemi 0:098463de4c5d 239 return( ret );
group-onsemi 0:098463de4c5d 240
group-onsemi 0:098463de4c5d 241 if( mbedtls_ssl_safer_memcmp( cookie + 4, ref_hmac, sizeof( ref_hmac ) ) != 0 )
group-onsemi 0:098463de4c5d 242 return( -1 );
group-onsemi 0:098463de4c5d 243
group-onsemi 0:098463de4c5d 244 #if defined(MBEDTLS_HAVE_TIME)
group-onsemi 0:098463de4c5d 245 cur_time = (unsigned long) mbedtls_time( NULL );
group-onsemi 0:098463de4c5d 246 #else
group-onsemi 0:098463de4c5d 247 cur_time = ctx->serial;
group-onsemi 0:098463de4c5d 248 #endif
group-onsemi 0:098463de4c5d 249
group-onsemi 0:098463de4c5d 250 cookie_time = ( (unsigned long) cookie[0] << 24 ) |
group-onsemi 0:098463de4c5d 251 ( (unsigned long) cookie[1] << 16 ) |
group-onsemi 0:098463de4c5d 252 ( (unsigned long) cookie[2] << 8 ) |
group-onsemi 0:098463de4c5d 253 ( (unsigned long) cookie[3] );
group-onsemi 0:098463de4c5d 254
group-onsemi 0:098463de4c5d 255 if( ctx->timeout != 0 && cur_time - cookie_time > ctx->timeout )
group-onsemi 0:098463de4c5d 256 return( -1 );
group-onsemi 0:098463de4c5d 257
group-onsemi 0:098463de4c5d 258 return( 0 );
group-onsemi 0:098463de4c5d 259 }
group-onsemi 0:098463de4c5d 260 #endif /* MBEDTLS_SSL_COOKIE_C */