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Refactor PSK parsing in ssl_server2

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Manuel Pégourié-Gonnard 2014-06-09 19:06:00 +02:00
parent 0cc7e31ad1
commit 9e27163acd
1 changed files with 46 additions and 39 deletions
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85
programs/ssl/ssl_server2.c
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@ -108,6 +108,8 @@
"<h2>PolarSSL Test Server</h2>\r\n" \ "<h2>PolarSSL Test Server</h2>\r\n" \
"<p>Successful connection using: %s</p>\r\n" // LONG_RESPONSE "<p>Successful connection using: %s</p>\r\n" // LONG_RESPONSE
#define MAX_PSK_LEN 256
/* /*
* global options * global options
*/ */
@ -433,6 +435,47 @@ int sni_callback( void *p_info, ssl_context *ssl,
#endif /* POLARSSL_SNI */ #endif /* POLARSSL_SNI */
#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
#define HEX2NUM( c ) \
if( c >= '0' && c <= '9' ) \
c -= '0'; \
else if( c >= 'a' && c <= 'f' ) \
c -= 'a' - 10; \
else if( c >= 'A' && c <= 'F' ) \
c -= 'A' - 10; \
else \
return( -1 );
/*
* Convert a hex string to bytes.
* Return 0 on success, -1 on error.
*/
int unhexify( unsigned char *output, const char *input, size_t *olen )
{
unsigned char c;
size_t j;
*olen = strlen( input );
if( *olen % 2 != 0 || *olen / 2 > MAX_PSK_LEN )
return( -1 );
*olen /= 2;
for( j = 0; j < *olen * 2; j += 2 )
{
c = input[j];
HEX2NUM( c );
output[ j / 2 ] = c << 4;
c = input[j + 1];
HEX2NUM( c );
output[ j / 2 ] |= c;
}
return( 0 );
}
#endif /* POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED */
int main( int argc, char *argv[] ) int main( int argc, char *argv[] )
{ {
int ret = 0, len, written, frags; int ret = 0, len, written, frags;
@ -440,7 +483,7 @@ int main( int argc, char *argv[] )
int client_fd = -1; int client_fd = -1;
unsigned char buf[SSL_MAX_CONTENT_LEN + 1]; unsigned char buf[SSL_MAX_CONTENT_LEN + 1];
#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED) #if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
unsigned char psk[256]; unsigned char psk[MAX_PSK_LEN];
size_t psk_len = 0; size_t psk_len = 0;
#endif #endif
const char *pers = "ssl_server2"; const char *pers = "ssl_server2";
@ -771,49 +814,13 @@ int main( int argc, char *argv[] )
/* /*
* Unhexify the pre-shared key if any is given * Unhexify the pre-shared key if any is given
*/ */
if( strlen( opt.psk ) ) if( opt.psk != NULL )
{ {
unsigned char c; if( unhexify( psk, opt.psk, &psk_len ) != 0 )
size_t j;
if( strlen( opt.psk ) % 2 != 0 )
{ {
printf("pre-shared key not valid hex\n"); printf("pre-shared key not valid hex\n");
goto exit; goto exit;
} }
psk_len = strlen( opt.psk ) / 2;
for( j = 0; j < strlen( opt.psk ); j += 2 )
{
c = opt.psk[j];
if( c >= '0' && c <= '9' )
c -= '0';
else if( c >= 'a' && c <= 'f' )
c -= 'a' - 10;
else if( c >= 'A' && c <= 'F' )
c -= 'A' - 10;
else
{
printf("pre-shared key not valid hex\n");
goto exit;
}
psk[ j / 2 ] = c << 4;
c = opt.psk[j + 1];
if( c >= '0' && c <= '9' )
c -= '0';
else if( c >= 'a' && c <= 'f' )
c -= 'a' - 10;
else if( c >= 'A' && c <= 'F' )
c -= 'A' - 10;
else
{
printf("pre-shared key not valid hex\n");
goto exit;
}
psk[ j / 2 ] |= c;
}
} }
#endif /* POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED */ #endif /* POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED */