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clean up KS keystate logic

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This commit is contained in:
Christian Grothoff 2020-01-17 18:55:26 +01:00
parent 7378b5a081
commit 33d71e7280
No known key found for this signature in database
GPG Key ID: 939E6BE1E29FC3CC
4 changed files with 318 additions and 313 deletions
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140
src/exchange/taler-exchange-httpd_deposit.c
View File

@ -256,7 +256,6 @@ verify_and_execute_deposit (struct MHD_Connection *connection,
int mhd_ret;
struct TALER_Amount amount_without_fee;
struct DepositContext dc;
struct TEH_KS_StateHandle *mks;
const struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
enum TALER_ErrorCode ec;
unsigned int hc;
@ -288,32 +287,35 @@ verify_and_execute_deposit (struct MHD_Connection *connection,
}
/* check denomination */
mks = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == mks)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
}
dki = TEH_KS_denomination_key_lookup_by_hash (mks,
&deposit->coin.denom_pub_hash,
TEH_KS_DKU_DEPOSIT,
&ec,
&hc);
if (NULL == dki)
{
TEH_KS_release (mks);
return TALER_MHD_reply_with_error (connection,
hc,
ec,
"Could not find denomination key used in deposit");
}
TALER_amount_ntoh (&dc.value,
&dki->issue.properties.value);
TEH_KS_release (mks);
struct TEH_KS_StateHandle *mks;
mks = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == mks)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
}
dki = TEH_KS_denomination_key_lookup_by_hash (mks,
&deposit->coin.denom_pub_hash,
TEH_KS_DKU_DEPOSIT,
&ec,
&hc);
if (NULL == dki)
{
TEH_KS_release (mks);
return TALER_MHD_reply_with_error (connection,
hc,
ec,
"Could not find denomination key used in deposit");
}
TALER_amount_ntoh (&dc.value,
&dki->issue.properties.value);
TEH_KS_release (mks);
}
/* execute transaction */
dc.deposit = deposit;
if (GNUNET_OK !=
@ -406,7 +408,6 @@ TEH_DEPOSIT_handler_deposit (struct TEH_RequestHandler *rh,
unsigned int hc;
struct TALER_EXCHANGEDB_Deposit deposit;
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
struct TEH_KS_StateHandle *key_state;
struct GNUNET_HashCode my_h_wire;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_json ("wire", &wire),
@ -503,50 +504,53 @@ TEH_DEPOSIT_handler_deposit (struct TEH_RequestHandler *rh,
}
/* check denomination exists and is valid */
key_state = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == key_state)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
GNUNET_JSON_parse_free (spec);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
}
dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&deposit.coin.denom_pub_hash,
TEH_KS_DKU_DEPOSIT,
&ec,
&hc);
if (NULL == dki)
{
TEH_KS_release (key_state);
TALER_LOG_WARNING ("Unknown denomination key in /deposit request\n");
GNUNET_JSON_parse_free (spec);
return TALER_MHD_reply_with_error (connection,
hc,
ec,
"Could not find denomination key used in deposit");
}
TALER_amount_ntoh (&deposit.deposit_fee,
&dki->issue.properties.fee_deposit);
/* check coin signature */
if (GNUNET_YES !=
TALER_test_coin_valid (&deposit.coin,
&dki->denom_pub))
{
TALER_LOG_WARNING ("Invalid coin passed for /deposit\n");
TEH_KS_release (key_state);
GNUNET_JSON_parse_free (spec);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_UNAUTHORIZED,
TALER_EC_DEPOSIT_DENOMINATION_SIGNATURE_INVALID,
"ub_sig");
}
TALER_amount_ntoh (&deposit.deposit_fee,
&dki->issue.properties.fee_deposit);
TEH_KS_release (key_state);
struct TEH_KS_StateHandle *key_state;
key_state = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == key_state)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
GNUNET_JSON_parse_free (spec);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
}
dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&deposit.coin.denom_pub_hash,
TEH_KS_DKU_DEPOSIT,
&ec,
&hc);
if (NULL == dki)
{
TEH_KS_release (key_state);
TALER_LOG_WARNING ("Unknown denomination key in /deposit request\n");
GNUNET_JSON_parse_free (spec);
return TALER_MHD_reply_with_error (connection,
hc,
ec,
"Could not find denomination key used in deposit");
}
TALER_amount_ntoh (&deposit.deposit_fee,
&dki->issue.properties.fee_deposit);
/* check coin signature */
if (GNUNET_YES !=
TALER_test_coin_valid (&deposit.coin,
&dki->denom_pub))
{
TALER_LOG_WARNING ("Invalid coin passed for /deposit\n");
TEH_KS_release (key_state);
GNUNET_JSON_parse_free (spec);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_UNAUTHORIZED,
TALER_EC_DEPOSIT_DENOMINATION_SIGNATURE_INVALID,
"ub_sig");
}
TALER_amount_ntoh (&deposit.deposit_fee,
&dki->issue.properties.fee_deposit);
TEH_KS_release (key_state);
}
if (0 < TALER_amount_cmp (&deposit.deposit_fee,
&deposit.amount_with_fee))
{

3
src/exchange/taler-exchange-httpd_keystate.c
View File

@ -448,6 +448,7 @@ ks_release (struct TEH_KS_StateHandle *key_state)
key_state->refcnt--;
if (0 == key_state->refcnt)
{
GNUNET_assert (key_state != internal_key_state);
if (NULL != key_state->denomkey_map)
{
GNUNET_CONTAINER_multihashmap_iterate (key_state->denomkey_map,
@ -476,7 +477,6 @@ ks_release (struct TEH_KS_StateHandle *key_state)
GNUNET_array_grow (key_state->krd_array,
key_state->krd_array_length,
0);
GNUNET_assert (key_state != internal_key_state);
GNUNET_free (key_state);
}
}
@ -1261,6 +1261,7 @@ setup_general_response_headers (const struct TEH_KS_StateHandle *key_state,
m = GNUNET_TIME_relative_to_absolute (TEH_max_keys_caching);
m = GNUNET_TIME_absolute_min (m,
key_state->next_reload);
m = GNUNET_TIME_UNIT_FOREVER_ABS;
get_date_string (m,
dat);
// FIXME: setting 'm' to FOREVER here exposes

157
src/exchange/taler-exchange-httpd_payback.c
View File

@ -420,7 +420,6 @@ verify_and_execute_payback (struct MHD_Connection *connection,
int refreshed)
{
struct PaybackContext pc;
struct TEH_KS_StateHandle *key_state;
const struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
struct TALER_PaybackRequestPS pr;
struct GNUNET_HashCode c_hash;
@ -430,86 +429,88 @@ verify_and_execute_payback (struct MHD_Connection *connection,
unsigned int hc;
/* check denomination exists and is in payback mode */
key_state = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == key_state)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
}
dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&coin->denom_pub_hash,
TEH_KS_DKU_PAYBACK,
&ec,
&hc);
if (NULL == dki)
{
struct TEH_KS_StateHandle *key_state;
key_state = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == key_state)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
}
dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&coin->denom_pub_hash,
TEH_KS_DKU_PAYBACK,
&ec,
&hc);
if (NULL == dki)
{
TEH_KS_release (key_state);
TALER_LOG_WARNING (
"Denomination key in /payback request not in payback mode\n");
return TALER_MHD_reply_with_error (connection,
hc,
ec,
"denomination not allowing payback");
}
TALER_amount_ntoh (&pc.value,
&dki->issue.properties.value);
/* check denomination signature */
if (GNUNET_YES !=
TALER_test_coin_valid (coin,
&dki->denom_pub))
{
TALER_LOG_WARNING ("Invalid coin passed for /payback\n");
TEH_KS_release (key_state);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_PAYBACK_DENOMINATION_SIGNATURE_INVALID,
"denom_sig");
}
/* check payback request signature */
pr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_PAYBACK);
pr.purpose.size = htonl (sizeof (struct TALER_PaybackRequestPS));
pr.coin_pub = coin->coin_pub;
pr.h_denom_pub = dki->issue.properties.denom_hash;
pr.coin_blind = *coin_bks;
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_PAYBACK,
&pr.purpose,
&coin_sig->eddsa_signature,
&coin->coin_pub.eddsa_pub))
{
TALER_LOG_WARNING ("Invalid signature on /payback request\n");
TEH_KS_release (key_state);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_PAYBACK_SIGNATURE_INVALID,
"coin_sig");
}
GNUNET_CRYPTO_hash (&coin->coin_pub.eddsa_pub,
sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
&c_hash);
if (GNUNET_YES !=
GNUNET_CRYPTO_rsa_blind (&c_hash,
&coin_bks->bks,
dki->denom_pub.rsa_public_key,
&coin_ev,
&coin_ev_size))
{
GNUNET_break (0);
TEH_KS_release (key_state);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_PAYBACK_BLINDING_FAILED,
"coin_bks");
}
TEH_KS_release (key_state);
TALER_LOG_WARNING (
"Denomination key in /payback request not in payback mode\n");
return TALER_MHD_reply_with_error (connection,
hc,
ec,
"denomination not allowing payback");
}
TALER_amount_ntoh (&pc.value,
&dki->issue.properties.value);
/* check denomination signature */
if (GNUNET_YES !=
TALER_test_coin_valid (coin,
&dki->denom_pub))
{
TALER_LOG_WARNING ("Invalid coin passed for /payback\n");
TEH_KS_release (key_state);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_PAYBACK_DENOMINATION_SIGNATURE_INVALID,
"denom_sig");
}
/* check payback request signature */
pr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_COIN_PAYBACK);
pr.purpose.size = htonl (sizeof (struct TALER_PaybackRequestPS));
pr.coin_pub = coin->coin_pub;
pr.h_denom_pub = dki->issue.properties.denom_hash;
pr.coin_blind = *coin_bks;
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_WALLET_COIN_PAYBACK,
&pr.purpose,
&coin_sig->eddsa_signature,
&coin->coin_pub.eddsa_pub))
{
TALER_LOG_WARNING ("Invalid signature on /payback request\n");
TEH_KS_release (key_state);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_PAYBACK_SIGNATURE_INVALID,
"coin_sig");
}
GNUNET_CRYPTO_hash (&coin->coin_pub.eddsa_pub,
sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
&c_hash);
if (GNUNET_YES !=
GNUNET_CRYPTO_rsa_blind (&c_hash,
&coin_bks->bks,
dki->denom_pub.rsa_public_key,
&coin_ev,
&coin_ev_size))
{
GNUNET_break (0);
TEH_KS_release (key_state);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_PAYBACK_BLINDING_FAILED,
"coin_bks");
}
TEH_KS_release (key_state);
GNUNET_CRYPTO_hash (coin_ev,
coin_ev_size,
&pc.h_blind);

331
src/exchange/taler-exchange-httpd_refresh_melt.c
View File

@ -51,7 +51,7 @@ static int
reply_refresh_melt_insufficient_funds (struct MHD_Connection *connection,
const struct
TALER_CoinSpendPublicKeyP *coin_pub,
struct TALER_Amount coin_value,
const struct TALER_Amount *coin_value,
struct TALER_EXCHANGEDB_TransactionList *
tl,
const struct TALER_Amount *requested,
@ -77,7 +77,7 @@ reply_refresh_melt_insufficient_funds (struct MHD_Connection *connection,
"coin_pub",
GNUNET_JSON_from_data_auto (coin_pub),
"original_value",
TALER_JSON_from_amount (&coin_value),
TALER_JSON_from_amount (coin_value),
"residual_value",
TALER_JSON_from_amount (residual),
"requested_value",
@ -144,12 +144,17 @@ struct RefreshMeltContext
struct TALER_EXCHANGEDB_RefreshSession refresh_session;
/**
* Information about the @e coin's denomination.
* Information about the @e coin's value.
*/
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
struct TALER_Amount coin_value;
/**
* Set to #GNUNET_YES if this @a dki was revoked and the operation
* Information about the @e coin's refresh fee.
*/
struct TALER_Amount coin_refresh_fee;
/**
* Set to #GNUNET_YES if this coin's denomination was revoked and the operation
* is thus only allowed for zombie coins where the transaction
* history includes a #TALER_EXCHANGEDB_TT_OLD_COIN_PAYBACK.
*/
@ -175,12 +180,9 @@ refresh_check_melt (struct MHD_Connection *connection,
int *mhd_ret)
{
struct TALER_EXCHANGEDB_TransactionList *tl;
struct TALER_Amount coin_value;
struct TALER_Amount spent;
enum GNUNET_DB_QueryStatus qs;
TALER_amount_ntoh (&coin_value,
&rmc->dki->issue.properties.value);
/* Start with cost of this melt transaction */
spent = rmc->refresh_session.amount_with_fee;
@ -242,7 +244,7 @@ refresh_check_melt (struct MHD_Connection *connection,
/* Refuse to refresh when the coin's value is insufficient
for the cost of all transactions. */
if (TALER_amount_cmp (&coin_value,
if (TALER_amount_cmp (&rmc->coin_value,
&spent) < 0)
{
struct TALER_Amount coin_residual;
@ -254,7 +256,7 @@ refresh_check_melt (struct MHD_Connection *connection,
*mhd_ret = reply_refresh_melt_insufficient_funds (connection,
&rmc->refresh_session.coin
.coin_pub,
coin_value,
&rmc->coin_value,
tl,
&rmc->refresh_session.
amount_with_fee,
@ -374,22 +376,6 @@ static int
handle_refresh_melt (struct MHD_Connection *connection,
struct RefreshMeltContext *rmc)
{
/* sanity-check that "total melt amount > melt fee" */
{
struct TALER_Amount fee_refresh;
TALER_amount_ntoh (&fee_refresh,
&rmc->dki->issue.properties.fee_refresh);
if (TALER_amount_cmp (&fee_refresh,
&rmc->refresh_session.amount_with_fee) > 0)
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_REFRESH_MELT_FEES_EXCEED_CONTRIBUTION,
"melt amount smaller than melting fee");
}
}
/* verify signature of coin for melt operation */
{
@ -401,7 +387,8 @@ handle_refresh_melt (struct MHD_Connection *connection,
body.rc = rmc->refresh_session.rc;
TALER_amount_hton (&body.amount_with_fee,
&rmc->refresh_session.amount_with_fee);
body.melt_fee = rmc->dki->issue.properties.fee_refresh;
TALER_amount_hton (&body.melt_fee,
&rmc->coin_refresh_fee);
body.coin_pub = rmc->refresh_session.coin.coin_pub;
if (GNUNET_OK !=
@ -440,6 +427,155 @@ handle_refresh_melt (struct MHD_Connection *connection,
}
/**
* Check for information about the melted coin's denomination,
* extracting its validity status and fee structure.
*
* @param connection HTTP connection we are handling
* @param rmc parsed request information
* @return MHD status code
*/
static int
check_for_denomination_key (struct MHD_Connection *connection,
struct RefreshMeltContext *rmc)
{
struct TEH_KS_StateHandle *key_state;
key_state = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == key_state)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
}
{
/* Baseline: check if deposits/refreshs are generally
simply still allowed for this denomination */
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
unsigned int hc;
enum TALER_ErrorCode ec;
dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&rmc->refresh_session.coin.
denom_pub_hash,
TEH_KS_DKU_DEPOSIT,
&ec,
&hc);
/* Consider case that denomination was revoked but
this coin was already seen and thus refresh is OK. */
if (NULL == dki)
{
dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&rmc->refresh_session.coin.
denom_pub_hash,
TEH_KS_DKU_PAYBACK,
&ec,
&hc);
if (NULL != dki)
{
struct GNUNET_HashCode denom_hash;
enum GNUNET_DB_QueryStatus qs;
qs = TEH_plugin->get_coin_denomination (TEH_plugin->cls,
NULL,
&rmc->refresh_session.coin.
coin_pub,
&denom_hash);
if (0 > qs)
{
TEH_KS_release (key_state);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_REFRESH_MELT_DB_FETCH_ERROR,
"failed to find information about old coin");
}
GNUNET_break (0 ==
GNUNET_memcmp (&denom_hash,
&rmc->refresh_session.coin.denom_pub_hash));
if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != qs)
{
/* We never saw this coin before, so _this_ justification is not OK */
dki = NULL;
}
}
}
/* Consider the case that the denomination expired for deposits,
but /refresh/payback refilled the balance of the 'zombie' coin
and we should thus allow the refresh during the legal period. */
if (NULL == dki)
{
dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&rmc->refresh_session.coin.
denom_pub_hash,
TEH_KS_DKU_ZOMBIE,
&ec,
&hc);
if (NULL != dki)
rmc->zombie_required = GNUNET_YES;
}
if (NULL == dki)
{
TEH_KS_release (key_state);
TALER_LOG_WARNING ("Unknown denomination key in /refresh/melt request\n");
return TALER_MHD_reply_with_error (connection,
hc,
ec,
"unknown denomination");
}
TALER_amount_ntoh (&rmc->coin_refresh_fee,
&dki->issue.properties.fee_refresh);
TALER_amount_ntoh (&rmc->coin_value,
&dki->issue.properties.value);
if (GNUNET_OK !=
TALER_test_coin_valid (&rmc->refresh_session.coin,
&dki->denom_pub))
{
GNUNET_break_op (0);
TEH_KS_release (key_state);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_REFRESH_MELT_DENOMINATION_SIGNATURE_INVALID,
"denom_sig");
}
}
TEH_KS_release (key_state);
/* run actual logic, now that the request was parsed */
/* make sure coin is 'known' in database */
{
struct TEH_DB_KnowCoinContext kcc;
int mhd_ret;
kcc.coin = &rmc->refresh_session.coin;
kcc.connection = connection;
if (GNUNET_OK !=
TEH_DB_run_transaction (connection,
"know coin for refresh-melt",
&mhd_ret,
&TEH_DB_know_coin_transaction,
&kcc))
return mhd_ret;
}
/* sanity-check that "total melt amount > melt fee" */
if (TALER_amount_cmp (&rmc->coin_refresh_fee,
&rmc->refresh_session.amount_with_fee) > 0)
{
GNUNET_break_op (0);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_BAD_REQUEST,
TALER_EC_REFRESH_MELT_FEES_EXCEED_CONTRIBUTION,
"melt amount smaller than melting fee");
}
return handle_refresh_melt (connection,
rmc);
}
/**
* Handle a "/refresh/melt" request. Parses the request into the JSON
* components and then hands things of to #handle_refresh_melt_json()
@ -463,9 +599,6 @@ TEH_REFRESH_handler_refresh_melt (struct TEH_RequestHandler *rh,
json_t *root;
struct RefreshMeltContext rmc;
int res;
unsigned int hc;
enum TALER_ErrorCode ec;
struct TEH_KS_StateHandle *key_state;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_fixed_auto ("coin_pub",
&rmc.refresh_session.coin.coin_pub),
@ -504,143 +637,9 @@ TEH_REFRESH_handler_refresh_melt (struct TEH_RequestHandler *rh,
if (GNUNET_OK != res)
return (GNUNET_SYSERR == res) ? MHD_NO : MHD_YES;
key_state = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == key_state)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
res = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
goto cleanup;
}
/* Baseline: check if deposits/refreshs are generally
simply still allowed for this denomination */
rmc.dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&rmc.refresh_session.coin.
denom_pub_hash,
TEH_KS_DKU_DEPOSIT,
&ec,
&hc);
/* Consider case that denomination was revoked but
this coin was already seen and thus refresh is OK. */
if (NULL == rmc.dki)
{
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&rmc.refresh_session.coin.
denom_pub_hash,
TEH_KS_DKU_PAYBACK,
&ec,
&hc);
if (NULL != dki)
{
struct TALER_CoinPublicInfo coin_info;
enum GNUNET_DB_QueryStatus qs;
qs = TEH_plugin->get_known_coin (TEH_plugin->cls,
NULL,
&rmc.refresh_session.coin.coin_pub,
&coin_info);
if (0 > qs)
{
GNUNET_break (0);
res = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_REFRESH_MELT_DB_FETCH_ERROR,
"failed to find information about old coin");
goto cleanup;
}
if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
{
/* Coin was known beforehand, so we should allow the refresh */
rmc.dki = dki;
GNUNET_CRYPTO_rsa_signature_free (coin_info.denom_sig.rsa_signature);
}
}
}
/* Consider the case that the denomination expired for deposits,
but /refresh/payback refilled the balance of the 'zombie' coin
and we should thus allow the refresh during the legal period. */
if (NULL == rmc.dki)
{
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
dki = TEH_KS_denomination_key_lookup_by_hash (key_state,
&rmc.refresh_session.coin.
denom_pub_hash,
TEH_KS_DKU_ZOMBIE,
&ec,
&hc);
if (NULL != dki)
{
rmc.dki = dki;
rmc.zombie_required = GNUNET_YES;
}
}
if (NULL == rmc.dki)
{
TALER_LOG_WARNING ("Unknown denomination key in /refresh/melt request\n");
res = TALER_MHD_reply_with_error (connection,
hc,
ec,
"unknown denomination");
goto cleanup;
}
if (GNUNET_OK !=
TALER_test_coin_valid (&rmc.refresh_session.coin,
&rmc.dki->denom_pub))
{
GNUNET_break_op (0);
GNUNET_JSON_parse_free (spec);
TEH_KS_release (key_state);
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_FORBIDDEN,
TALER_EC_REFRESH_MELT_DENOMINATION_SIGNATURE_INVALID,
"denom_sig");
}
/* run actual logic, now that the request was parsed */
/* make sure coin is 'known' in database */
{
struct TEH_DB_KnowCoinContext kcc;
int mhd_ret;
kcc.coin = &rmc.refresh_session.coin;
kcc.connection = connection;
if (GNUNET_OK !=
TEH_DB_run_transaction (connection,
"know coin for refresh-melt",
&mhd_ret,
&TEH_DB_know_coin_transaction,
&kcc))
return mhd_ret;
}
res = handle_refresh_melt (connection,
&rmc);
cleanup:
if (NULL != key_state)
{
TEH_KS_release (key_state);
key_state = NULL;
}
if (NULL != rmc.refresh_session.coin.denom_sig.rsa_signature)
{
GNUNET_CRYPTO_rsa_signature_free (
rmc.refresh_session.coin.denom_sig.rsa_signature);
rmc.refresh_session.coin.denom_sig.rsa_signature = NULL;
}
res = check_for_denomination_key (connection,
&rmc);
GNUNET_JSON_parse_free (spec);
return res;
}