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check exchange signature on /wire/deposit response (#4135)

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This commit is contained in:
Christian Grothoff 2016-04-11 20:16:58 +02:00
parent ce9dd3365d
commit cb987575c1
4 changed files with 55 additions and 17 deletions
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1
src/exchange-lib/exchange_api_common.c
View File

@ -119,7 +119,6 @@ TALER_EXCHANGE_verify_coin_history_ (const char *currency,
return GNUNET_SYSERR;
}
// FIXME: check sig!
TALER_amount_ntoh (&dr_amount,
&dr->amount_with_fee);
if (0 != TALER_amount_cmp (&dr_amount,

49
src/exchange-lib/exchange_api_wire_deposits.c
View File

@ -101,12 +101,12 @@ handle_wire_deposits_finished (void *cls,
struct TALER_Amount total_amount;
struct TALER_MerchantPublicKeyP merchant_pub;
unsigned int num_details;
struct TALER_ExchangePublicKeyP pub;
struct TALER_ExchangeSignatureP sig;
struct TALER_ExchangePublicKeyP exchange_pub;
struct TALER_ExchangeSignatureP exchange_sig;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("H_wire", &h_wire),
GNUNET_JSON_spec_fixed_auto ("exchange_pub", &pub),
GNUNET_JSON_spec_fixed_auto ("exchange_sig", &sig),
GNUNET_JSON_spec_fixed_auto ("exchange_pub", &exchange_pub),
GNUNET_JSON_spec_fixed_auto ("exchange_sig", &exchange_sig),
GNUNET_JSON_spec_fixed_auto ("merchant_pub", &merchant_pub),
TALER_JSON_spec_amount ("total_amount", &total_amount),
GNUNET_JSON_spec_json ("details", &details_j),
@ -126,7 +126,11 @@ handle_wire_deposits_finished (void *cls,
{
struct TALER_WireDepositDetails details[num_details];
unsigned int i;
struct GNUNET_HashContext *hash_context;
struct TALER_WireDepositDetailP dd;
struct TALER_WireDepositDataPS wdp;
hash_context = GNUNET_CRYPTO_hash_context_start ();
for (i=0;i<num_details;i++)
{
struct TALER_WireDepositDetails *detail = &details[i];
@ -149,10 +153,45 @@ handle_wire_deposits_finished (void *cls,
response_code = 0;
break;
}
/* build up big hash for signature checking later */
dd.h_contract = detail->h_contract;
dd.transaction_id = GNUNET_htonll (detail->transaction_id);
dd.coin_pub = detail->coin_pub;
TALER_amount_hton (&dd.deposit_value,
&detail->coin_value);
TALER_amount_hton (&dd.deposit_fee,
&detail->coin_fee);
GNUNET_CRYPTO_hash_context_read (hash_context,
&dd,
sizeof (struct TALER_WireDepositDetailP));
}
/* Check signature */
wdp.purpose.purpose = htonl (TALER_SIGNATURE_EXCHANGE_CONFIRM_WIRE_DEPOSIT);
wdp.purpose.size = htonl (sizeof (struct TALER_WireDepositDataPS));
TALER_amount_hton (&wdp.total,
&total_amount);
wdp.merchant_pub = merchant_pub;
wdp.h_wire = h_wire;
GNUNET_CRYPTO_hash_context_finish (hash_context,
&wdp.h_details);
if ( (0 == response_code /* avoid crypto if things are already wrong */) &&
(GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (TALER_EXCHANGE_get_keys (wdh->exchange),
&exchange_pub)) )
{
GNUNET_break_op (0);
response_code = 0;
}
if ( (0 == response_code /* avoid crypto if things are already wrong */) &&
(GNUNET_OK !=
TALER_EXCHANGE_test_signing_key (TALER_EXCHANGE_get_keys (wdh->exchange),
&exchange_pub)) )
{
GNUNET_break_op (0);
response_code = 0;
}
if (0 == response_code)
break;
/* FIXME: check signature (#4135) */
wdh->cb (wdh->cb_cls,
response_code,
json,