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extend exchangedb API to allow storing DK revocation information

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This commit is contained in:
Christian Grothoff 2017-04-08 22:01:13 +02:00
parent 5f67d984b2
commit 8e9d6c6fd1
No known key found for this signature in database
GPG Key ID: 939E6BE1E29FC3CC
2 changed files with 174 additions and 0 deletions
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137
src/exchangedb/plugin_exchangedb_postgres.c
View File

@ -312,6 +312,15 @@ postgres_create_tables (void *cls)
",fee_refund_frac INT4 NOT NULL"
",fee_refund_curr VARCHAR("TALER_CURRENCY_LEN_STR") NOT NULL"
")");
/* denomination_revocations table is for remembering which denomination keys have been revoked */
/* TODO (#4981): change denom_pub_hash to REFERENCE 'denominations', and
add denom_pub_hash column to denominations, changing other REFERENCEs
also to the hash!? */
SQLEXEC ("CREATE TABLE IF NOT EXISTS denomination_revocations"
"(denom_pub_hash BYTEA PRIMARY KEY CHECK (LENGTH(denom_pub_hash)=64)"
",master_sig BYTEA NOT NULL CHECK (LENGTH(master_sig)=64)"
")");
/* reserves table is for summarization of a reserve. It is updated when new
funds are added and existing funds are withdrawn. The 'expiration_date'
can be used to eventually get rid of reserves that have not been used
@ -645,6 +654,24 @@ postgres_prepare (PGconn *db_conn)
" WHERE denom_pub=$1;",
1, NULL);
/* Used in #postgres_insert_denomination_revocation() */
PREPARE ("denomination_revocation_insert",
"INSERT INTO denomination_revocations "
"(denom_pub_hash"
",master_sig"
") VALUES "
"($1, $2);",
2, NULL);
/* Used in #postgres_get_denomination_revocation() */
PREPARE ("denomination_revocation_get",
"SELECT"
" master_sig"
" FROM denomination_revocations"
" WHERE denom_pub_hash=$1;",
1, NULL);
/* Used in #postgres_reserve_get() */
PREPARE ("reserve_get",
"SELECT"
@ -5952,6 +5979,114 @@ postgres_get_reserve_by_h_blind (void *cls,
}
/**
* Store information that a denomination key was revoked
* in the database.
*
* @param cls closure
* @param session a session
* @param denom_pub_hash hash of the revoked denomination key
* @param master_sig signature affirming the revocation
* @return #GNUNET_OK on success,
* #GNUNET_NO if the entry already exists
* #GNUNET_SYSERR on DB errors
*/
static int
postgres_insert_denomination_revocation (void *cls,
struct TALER_EXCHANGEDB_Session *session,
const struct GNUNET_HashCode *denom_pub_hash,
const struct TALER_MasterSignatureP *master_sig)
{
PGresult *result;
int ret;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_auto_from_type (denom_pub_hash),
GNUNET_PQ_query_param_auto_from_type (master_sig),
GNUNET_PQ_query_param_end
};
result = GNUNET_PQ_exec_prepared (session->conn,
"denomination_revocation_insert",
params);
if (PGRES_COMMAND_OK != PQresultStatus (result))
{
ret = GNUNET_SYSERR;
BREAK_DB_ERR (result, session->conn);
}
else
{
ret = GNUNET_OK;
}
PQclear (result);
return ret;
}
/**
* Obtain information about a denomination key's revocation from
* the database.
*
* @param cls closure
* @param session a session
* @param denom_pub_hash hash of the revoked denomination key
* @param[out] master_sig signature affirming the revocation
* @return #GNUNET_OK on success,
* #GNUNET_NO no such entry exists
* #GNUNET_SYSERR on DB errors
*/
static int
postgres_get_denomination_revocation (void *cls,
struct TALER_EXCHANGEDB_Session *session,
const struct GNUNET_HashCode *denom_pub_hash,
struct TALER_MasterSignatureP *master_sig)
{
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_auto_from_type (denom_pub_hash),
GNUNET_PQ_query_param_end
};
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_auto_from_type ("master_sig", master_sig),
GNUNET_PQ_result_spec_end
};
PGresult *result;
int nrows;
result = GNUNET_PQ_exec_prepared (session->conn,
"denomination_revocation_get",
params);
if (PGRES_TUPLES_OK !=
PQresultStatus (result))
{
BREAK_DB_ERR (result, session->conn);
PQclear (result);
return GNUNET_SYSERR;
}
nrows = PQntuples (result);
if (0 == nrows)
{
/* no matches found */
PQclear (result);
return GNUNET_NO;
}
if (1 != nrows)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
0))
{
PQclear (result);
GNUNET_break (0);
return GNUNET_SYSERR;
}
PQclear (result);
return GNUNET_OK;
}
/**
* Initialize Postgres database subsystem.
*
@ -6055,6 +6190,8 @@ libtaler_plugin_exchangedb_postgres_init (void *cls)
plugin->select_payback_above_serial_id = &postgres_select_payback_above_serial_id;
plugin->insert_payback_request = &postgres_insert_payback_request;
plugin->get_reserve_by_h_blind = &postgres_get_reserve_by_h_blind;
plugin->insert_denomination_revocation = &postgres_insert_denomination_revocation;
plugin->get_denomination_revocation = &postgres_get_denomination_revocation;
return plugin;
}

37
src/include/taler_exchangedb_plugin.h
View File

@ -2012,6 +2012,43 @@ struct TALER_EXCHANGEDB_Plugin
const struct GNUNET_HashCode *h_blind_ev,
struct TALER_ReservePublicKeyP *reserve_pub);
/**
* Store information that a denomination key was revoked
* in the database.
*
* @param cls closure
* @param session a session
* @param denom_pub_hash hash of the revoked denomination key
* @param master_sig signature affirming the revocation
* @return #GNUNET_OK on success,
* #GNUNET_NO if the entry already exists
* #GNUNET_SYSERR on DB errors
*/
int
(*insert_denomination_revocation)(void *cls,
struct TALER_EXCHANGEDB_Session *session,
const struct GNUNET_HashCode *denom_pub_hash,
const struct TALER_MasterSignatureP *master_sig);
/**
* Obtain information about a denomination key's revocation from
* the database.
*
* @param cls closure
* @param session a session
* @param denom_pub_hash hash of the revoked denomination key
* @param[out] master_sig signature affirming the revocation
* @return #GNUNET_OK on success,
* #GNUNET_NO no such entry exists
* #GNUNET_SYSERR on DB errors
*/
int
(*get_denomination_revocation)(void *cls,
struct TALER_EXCHANGEDB_Session *session,
const struct GNUNET_HashCode *denom_pub_hash,
struct TALER_MasterSignatureP *master_sig);
};