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Move to callback for session tickets

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This commit is contained in:
Manuel Pégourié-Gonnard
2015-05-19 15:28:00 +02:00
parent 2ff873c0fa
commit d59675d92c
6 changed files with 257 additions and 132 deletions
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68
library/ssl_ticket.c
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@ -39,6 +39,56 @@
#include <string.h>
/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
/*
* Initialze context
*/
void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx )
{
memset( ctx, 0, sizeof( mbedtls_ssl_ticket_context ) );
}
/*
* Setup context for actual use
*/
int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
uint32_t lifetime )
{
int ret;
unsigned char buf[16];
ctx->f_rng = f_rng;
ctx->p_rng = p_rng;
ctx->ticket_lifetime = lifetime;
mbedtls_aes_init( &ctx->enc );
mbedtls_aes_init( &ctx->dec );
if( ( ret = f_rng( p_rng, ctx->key_name, 16 ) != 0 ) ||
( ret = f_rng( p_rng, ctx->mac_key, 16 ) != 0 ) ||
( ret = f_rng( p_rng, buf, 16 ) != 0 ) )
{
return( ret );
}
if( ( ret = mbedtls_aes_setkey_enc( &ctx->enc, buf, 128 ) ) != 0 ||
( ret = mbedtls_aes_setkey_dec( &ctx->dec, buf, 128 ) ) != 0 )
{
mbedtls_ssl_ticket_free( ctx );
return( ret );
}
mbedtls_zeroize( buf, sizeof( buf ) );
return( 0 );
}
/*
* Serialize a session in the following format:
* 0 . n-1 session structure, n = sizeof(mbedtls_ssl_session)
@ -170,7 +220,7 @@ int mbedtls_ssl_ticket_write( void *p_ticket,
uint32_t *ticket_lifetime )
{
int ret;
mbedtls_ssl_ticket_keys *ctx = p_ticket;
mbedtls_ssl_ticket_context *ctx = p_ticket;
unsigned char *p = start;
unsigned char *state;
unsigned char iv[16];
@ -194,7 +244,8 @@ int mbedtls_ssl_ticket_write( void *p_ticket,
p += 16;
/* Generate and write IV (with a copy for aes_crypt) */
memset( p, 0x2a, 16 ); /* Temporary WIP */
if( ( ret = ctx->f_rng( ctx->p_rng, p, 16 ) ) != 0 )
return( ret );
memcpy( iv, p, 16 );
p += 16;
@ -244,7 +295,7 @@ int mbedtls_ssl_ticket_parse( void *p_ticket,
size_t len )
{
int ret;
mbedtls_ssl_ticket_keys *ctx = p_ticket;
mbedtls_ssl_ticket_context *ctx = p_ticket;
unsigned char *key_name = buf;
unsigned char *iv = buf + 16;
unsigned char *enc_len_p = iv + 16;
@ -317,4 +368,15 @@ int mbedtls_ssl_ticket_parse( void *p_ticket,
return( 0 );
}
/*
* Free context
*/
void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx )
{
mbedtls_aes_free( &ctx->enc );
mbedtls_aes_free( &ctx->dec );
mbedtls_zeroize( ctx, sizeof( mbedtls_ssl_ticket_context ) );
}
#endif /* MBEDTLS_SSL_TICKET_C */