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-rw-r--r--src/exchange/taler-exchange-httpd_common_deposit.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/src/exchange/taler-exchange-httpd_common_deposit.c b/src/exchange/taler-exchange-httpd_common_deposit.c
new file mode 100644
index 000000000..898e23dd9
--- /dev/null
+++ b/src/exchange/taler-exchange-httpd_common_deposit.c
@@ -0,0 +1,268 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2022 Taler Systems SA
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU Affero General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License along with
+ TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file taler-exchange-httpd_common_deposit.c
+ * @brief shared logic for handling deposited coins
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler-exchange-httpd_common_deposit.h"
+#include "taler-exchange-httpd.h"
+#include "taler-exchange-httpd_keys.h"
+
+
+enum GNUNET_GenericReturnValue
+TEH_common_purse_deposit_parse_coin (
+ struct MHD_Connection *connection,
+ struct TEH_PurseDepositedCoin *coin,
+ const json_t *jcoin)
+{
+ struct GNUNET_JSON_Specification spec[] = {
+ TALER_JSON_spec_amount ("amount",
+ TEH_currency,
+ &coin->amount),
+ GNUNET_JSON_spec_fixed_auto ("denom_pub_hash",
+ &coin->cpi.denom_pub_hash),
+ TALER_JSON_spec_denom_sig ("ub_sig",
+ &coin->cpi.denom_sig),
+ GNUNET_JSON_spec_mark_optional (
+ GNUNET_JSON_spec_fixed_auto ("attest",
+ &coin->attest),
+ &coin->no_attest),
+ GNUNET_JSON_spec_mark_optional (
+ TALER_JSON_spec_age_commitment ("age_commitment",
+ &coin->age_commitment),
+ &coin->cpi.no_age_commitment),
+ GNUNET_JSON_spec_fixed_auto ("coin_sig",
+ &coin->coin_sig),
+ GNUNET_JSON_spec_fixed_auto ("coin_pub",
+ &coin->cpi.coin_pub),
+ GNUNET_JSON_spec_end ()
+ };
+
+ memset (coin,
+ 0,
+ sizeof (*coin));
+ coin->cpi.no_age_commitment = true;
+ coin->no_attest = true;
+ {
+ enum GNUNET_GenericReturnValue res;
+
+ res = TALER_MHD_parse_json_data (connection,
+ jcoin,
+ spec);
+ if (GNUNET_OK != res)
+ return res;
+ }
+
+ /* check denomination exists and is valid */
+ {
+ struct TEH_DenominationKey *dk;
+ MHD_RESULT mret;
+
+ dk = TEH_keys_denomination_by_hash (&coin->cpi.denom_pub_hash,
+ connection,
+ &mret);
+ if (NULL == dk)
+ {
+ GNUNET_JSON_parse_free (spec);
+ return (MHD_YES == mret) ? GNUNET_NO : GNUNET_SYSERR;
+ }
+ if (! coin->cpi.no_age_commitment)
+ {
+ coin->age_commitment.mask = dk->meta.age_mask;
+ TALER_age_commitment_hash (&coin->age_commitment,
+ &coin->cpi.h_age_commitment);
+ }
+ if (0 > TALER_amount_cmp (&dk->meta.value,
+ &coin->amount))
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ return (MHD_YES ==
+ TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_BAD_REQUEST,
+ TALER_EC_EXCHANGE_GENERIC_AMOUNT_EXCEEDS_DENOMINATION_VALUE,
+ NULL))
+ ? GNUNET_NO : GNUNET_SYSERR;
+ }
+ if (GNUNET_TIME_absolute_is_past (dk->meta.expire_deposit.abs_time))
+ {
+ /* This denomination is past the expiration time for deposits */
+ GNUNET_JSON_parse_free (spec);
+ return (MHD_YES ==
+ TEH_RESPONSE_reply_expired_denom_pub_hash (
+ connection,
+ &coin->cpi.denom_pub_hash,
+ TALER_EC_EXCHANGE_GENERIC_DENOMINATION_EXPIRED,
+ "PURSE CREATE"))
+ ? GNUNET_NO : GNUNET_SYSERR;
+ }
+ if (GNUNET_TIME_absolute_is_future (dk->meta.start.abs_time))
+ {
+ /* This denomination is not yet valid */
+ GNUNET_JSON_parse_free (spec);
+ return (MHD_YES ==
+ TEH_RESPONSE_reply_expired_denom_pub_hash (
+ connection,
+ &coin->cpi.denom_pub_hash,
+ TALER_EC_EXCHANGE_GENERIC_DENOMINATION_VALIDITY_IN_FUTURE,
+ "PURSE CREATE"))
+ ? GNUNET_NO : GNUNET_SYSERR;
+ }
+ if (dk->recoup_possible)
+ {
+ /* This denomination has been revoked */
+ GNUNET_JSON_parse_free (spec);
+ return (MHD_YES ==
+ TEH_RESPONSE_reply_expired_denom_pub_hash (
+ connection,
+ &coin->cpi.denom_pub_hash,
+ TALER_EC_EXCHANGE_GENERIC_DENOMINATION_REVOKED,
+ "PURSE CREATE"))
+ ? GNUNET_NO : GNUNET_SYSERR;
+ }
+ if (dk->denom_pub.bsign_pub_key->cipher !=
+ coin->cpi.denom_sig.unblinded_sig->cipher)
+ {
+ /* denomination cipher and denomination signature cipher not the same */
+ GNUNET_JSON_parse_free (spec);
+ return (MHD_YES ==
+ TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_BAD_REQUEST,
+ TALER_EC_EXCHANGE_GENERIC_CIPHER_MISMATCH,
+ NULL))
+ ? GNUNET_NO : GNUNET_SYSERR;
+ }
+
+ coin->deposit_fee = dk->meta.fees.deposit;
+ if (0 < TALER_amount_cmp (&coin->deposit_fee,
+ &coin->amount))
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_BAD_REQUEST,
+ TALER_EC_EXCHANGE_DEPOSIT_NEGATIVE_VALUE_AFTER_FEE,
+ NULL);
+ }
+ GNUNET_assert (0 <=
+ TALER_amount_subtract (&coin->amount_minus_fee,
+ &coin->amount,
+ &coin->deposit_fee));
+
+ /* check coin signature */
+ switch (dk->denom_pub.bsign_pub_key->cipher)
+ {
+ case GNUNET_CRYPTO_BSA_RSA:
+ TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_RSA]++;
+ break;
+ case GNUNET_CRYPTO_BSA_CS:
+ TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_CS]++;
+ break;
+ default:
+ break;
+ }
+ if (GNUNET_YES !=
+ TALER_test_coin_valid (&coin->cpi,
+ &dk->denom_pub))
+ {
+ TALER_LOG_WARNING ("Invalid coin passed for /deposit\n");
+ GNUNET_JSON_parse_free (spec);
+ return (MHD_YES ==
+ TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_FORBIDDEN,
+ TALER_EC_EXCHANGE_DENOMINATION_SIGNATURE_INVALID,
+ NULL))
+ ? GNUNET_NO : GNUNET_SYSERR;
+ }
+ }
+ return GNUNET_OK;
+}
+
+
+enum GNUNET_GenericReturnValue
+TEH_common_deposit_check_purse_deposit (
+ struct MHD_Connection *connection,
+ const struct TEH_PurseDepositedCoin *coin,
+ const struct TALER_PurseContractPublicKeyP *purse_pub,
+ uint32_t min_age)
+{
+ if (GNUNET_OK !=
+ TALER_wallet_purse_deposit_verify (TEH_base_url,
+ purse_pub,
+ &coin->amount,
+ &coin->cpi.denom_pub_hash,
+ &coin->cpi.h_age_commitment,
+ &coin->cpi.coin_pub,
+ &coin->coin_sig))
+ {
+ TALER_LOG_WARNING (
+ "Invalid coin signature to deposit into purse\n");
+ return (MHD_YES ==
+ TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_FORBIDDEN,
+ TALER_EC_EXCHANGE_PURSE_DEPOSIT_COIN_SIGNATURE_INVALID,
+ TEH_base_url))
+ ? GNUNET_NO
+ : GNUNET_SYSERR;
+ }
+
+ if (0 == min_age)
+ return GNUNET_OK; /* no need to apply age checks */
+
+ /* Check and verify the age restriction. */
+ if (coin->no_attest != coin->cpi.no_age_commitment)
+ {
+ GNUNET_break_op (0);
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_BAD_REQUEST,
+ TALER_EC_EXCHANGE_PURSE_DEPOSIT_COIN_CONFLICTING_ATTEST_VS_AGE_COMMITMENT,
+ "mismatch of attest and age_commitment");
+ }
+
+ if (coin->cpi.no_age_commitment)
+ return GNUNET_OK; /* unrestricted coin */
+
+ /* age attestation must be valid */
+ if (GNUNET_OK !=
+ TALER_age_commitment_verify (&coin->age_commitment,
+ min_age,
+ &coin->attest))
+ {
+ GNUNET_break_op (0);
+ return TALER_MHD_reply_with_error (connection,
+ MHD_HTTP_BAD_REQUEST,
+ TALER_EC_EXCHANGE_PURSE_DEPOSIT_COIN_AGE_ATTESTATION_FAILURE,
+ "invalid attest for minimum age");
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Release data structures of @a coin. Note that
+ * @a coin itself is NOT freed.
+ *
+ * @param[in] coin information to release
+ */
+void
+TEH_common_purse_deposit_free_coin (struct TEH_PurseDepositedCoin *coin)
+{
+ TALER_denom_sig_free (&coin->cpi.denom_sig);
+ if (! coin->cpi.no_age_commitment)
+ GNUNET_free (coin->age_commitment.keys); /* Only the keys have been allocated */
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-23 16:06:49 +0000