[GNUnet-SVN] [gnunet] 121/171: -add ticket DB for IdP

[gnunet]

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martin-schanzenbach pushed a commit to branch master
in repository gnunet.

commit 76817ee408cff4aee534d6016423c8a4ecb5555f
Author: Schanzenbach, Martin <address@hidden>
AuthorDate: Thu Oct 5 19:59:39 2017 +0200

    -add ticket DB for IdP
---
 src/identity-provider/Makefile.am                  |  19 +-
 .../gnunet-service-identity-provider.c             | 411 ++++++++++++-
 src/identity-provider/identity-provider.conf       |   3 +
 src/identity-provider/identity_attribute.c         |  15 +
 src/identity-provider/identity_attribute.h         |   2 +
 src/identity-provider/identity_provider.h          |  64 ++
 .../plugin_identity_provider_sqlite.c              | 669 +++++++++++++++++++++
 src/include/gnunet_identity_provider_plugin.h      | 123 ++++
 src/include/gnunet_identity_provider_service.h     |  20 +-
 src/include/gnunet_protocols.h                     |   6 +
 10 files changed, 1294 insertions(+), 38 deletions(-)

diff --git a/src/identity-provider/Makefile.am 
b/src/identity-provider/Makefile.am
index 106c8a92b..1b35c6c04 100644
--- a/src/identity-provider/Makefile.am
+++ b/src/identity-provider/Makefile.am
@@ -12,6 +12,10 @@ if USE_COVERAGE
   XLIB = -lgcov
 endif
 
+if HAVE_SQLITE
+SQLITE_PLUGIN = libgnunet_plugin_identity_provider_sqlite.la
+endif
+
 pkgcfgdir= $(pkgdatadir)/config.d/
 
 libexecdir= $(pkglibdir)/libexec/
@@ -23,7 +27,8 @@ lib_LTLIBRARIES = \
   libgnunetidentityprovider.la
 plugin_LTLIBRARIES = \
        libgnunet_plugin_rest_identity_provider.la \
-       libgnunet_plugin_gnsrecord_identity_provider.la
+       libgnunet_plugin_gnsrecord_identity_provider.la \
+       $(SQLITE_PLUGIN)
 
 bin_PROGRAMS = \
  gnunet-identity-token \
@@ -40,6 +45,18 @@ libgnunet_plugin_gnsrecord_identity_provider_la_LIBADD = \
 libgnunet_plugin_gnsrecord_identity_provider_la_LDFLAGS = \
  $(GN_PLUGIN_LDFLAGS)
 
+libgnunet_plugin_identity_provider_sqlite_la_SOURCES = \
+  plugin_identity_provider_sqlite.c
+libgnunet_plugin_identity_provider_sqlite_la_LIBADD = \
+  $(top_builddir)/src/identity-provider/libgnunetidentityprovider.la  \
+  $(top_builddir)/src/sq/libgnunetsq.la \
+  $(top_builddir)/src/statistics/libgnunetstatistics.la \
+  $(top_builddir)/src/util/libgnunetutil.la $(XLIBS) -lsqlite3 \
+  $(LTLIBINTL)
+libgnunet_plugin_identity_provider_sqlite_la_LDFLAGS = \
+ $(GN_PLUGIN_LDFLAGS)
+
+
 
 gnunet_service_identity_provider_SOURCES = \
  gnunet-service-identity-provider.c \
diff --git a/src/identity-provider/gnunet-service-identity-provider.c 
b/src/identity-provider/gnunet-service-identity-provider.c
index 9a919102f..f77eebd6d 100644
--- a/src/identity-provider/gnunet-service-identity-provider.c
+++ b/src/identity-provider/gnunet-service-identity-provider.c
@@ -33,6 +33,7 @@
 #include "gnunet_credential_service.h"
 #include "gnunet_statistics_service.h"
 #include "gnunet_gns_service.h"
+#include "gnunet_identity_provider_plugin.h"
 #include "gnunet_signatures.h"
 #include "identity_provider.h"
 #include "identity_token.h"
@@ -65,6 +66,16 @@
 static struct GNUNET_IDENTITY_Handle *identity_handle;
 
 /**
+ * Database handle
+ */
+static struct GNUNET_IDENTITY_PROVIDER_PluginFunctions *TKT_database;
+
+/**
+ * Name of DB plugin
+ */
+static char *db_lib_name;
+
+/**
  * Token expiration interval
  */
 static struct GNUNET_TIME_Relative token_expiration_interval;
@@ -136,6 +147,54 @@ static const struct GNUNET_CONFIGURATION_Handle *cfg;
 struct IdpClient;
 
 /**
+ * A ticket iteration operation.
+ */
+struct TicketIteration
+{
+  /**
+   * DLL
+   */
+  struct TicketIteration *next;
+
+  /**
+   * DLL
+   */
+  struct TicketIteration *prev;
+
+  /**
+   * Client which intiated this zone iteration
+   */
+  struct IdpClient *client;
+
+  /**
+   * Key of the identity we are iterating over.
+   */
+  struct GNUNET_CRYPTO_EcdsaPublicKey identity;
+
+  /**
+   * Identity is audience
+   */
+  uint32_t is_audience;
+
+  /**
+   * The operation id fot the iteration in the response for the client
+   */
+  uint32_t r_id;
+
+  /**
+   * Offset of the iteration used to address next result of the 
+   * iteration in the store
+   *
+   * Initialy set to 0 in handle_iteration_start
+   * Incremented with by every call to handle_iteration_next
+   */
+  uint32_t offset;
+
+};
+
+
+
+/**
  * Callback after an ABE bootstrap
  *
  * @param cls closure
@@ -247,6 +306,16 @@ struct IdpClient
    * in progress initiated by this client
    */
   struct AttributeIterator *op_tail;
+
+  /**
+   * Head of DLL of ticket iteration ops
+   */
+  struct TicketIteration *ticket_iter_head;
+
+  /**
+   * Tail of DLL of ticket iteration ops
+   */
+  struct TicketIteration *ticket_iter_tail;
 };
 
 
@@ -605,7 +674,10 @@ cleanup()
     GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
     stats = NULL;
   }
-
+  GNUNET_break (NULL == GNUNET_PLUGIN_unload (db_lib_name,
+                                              TKT_database)); 
+  GNUNET_free (db_lib_name);
+  db_lib_name = NULL;
   if (NULL != timeout_task)
     GNUNET_SCHEDULER_cancel (timeout_task);
   if (NULL != update_task)
@@ -1666,31 +1738,48 @@ handle_issue_message (void *cls,
 static void
 cleanup_ticket_issue_handle (struct TicketIssueHandle *handle)
 {
-  struct GNUNET_IDENTITY_PROVIDER_AttributeListEntry *le;
-  struct GNUNET_IDENTITY_PROVIDER_AttributeListEntry *tmp_le;
-
-  for (le = handle->attrs->list_head; NULL != le;)
-  {
-    GNUNET_free (le->attribute);
-    tmp_le = le;
-    le = le->next;
-    GNUNET_free (tmp_le);
-  }
-  GNUNET_free (handle->attrs);
+  if (NULL != handle->attrs)
+    attribute_list_destroy (handle->attrs);
   if (NULL != handle->ns_qe)
     GNUNET_NAMESTORE_cancel (handle->ns_qe);
   GNUNET_free (handle);
 }
 
+
+static void
+send_ticket_result (struct IdpClient *client,
+                    uint32_t r_id,
+                    const struct GNUNET_IDENTITY_PROVIDER_Ticket2 *ticket,
+                    const struct GNUNET_IDENTITY_PROVIDER_AttributeList *attrs)
+{
+  struct TicketResultMessage *irm;
+  struct GNUNET_MQ_Envelope *env;
+  size_t attrs_size;
+  struct GNUNET_IDENTITY_PROVIDER_Ticket2 *ticket_buf;
+  char *attrs_buf;
+
+  attrs_size = attribute_list_serialize_get_size (attrs);
+
+  env = GNUNET_MQ_msg_extra (irm,
+                             sizeof (struct GNUNET_IDENTITY_PROVIDER_Ticket2) 
+ attrs_size,
+                       GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_RESULT);
+  ticket_buf = (struct GNUNET_IDENTITY_PROVIDER_Ticket2 *)&irm[1];
+  *ticket_buf = *ticket;
+  attrs_buf = (char*)&ticket_buf[1];
+  attribute_list_serialize (attrs,
+                            attrs_buf);
+  irm->id = htonl (r_id);
+
+  GNUNET_MQ_send (client->mq,
+                  env);
+}
+
 static void
 store_ticket_issue_cont (void *cls,
                         int32_t success,
                         const char *emsg)
 {
-  struct GNUNET_IDENTITY_PROVIDER_Ticket2 *ticket;
   struct TicketIssueHandle *handle = cls;
-  struct TicketResultMessage *irm;
-  struct GNUNET_MQ_Envelope *env;
 
   handle->ns_qe = NULL;
   if (GNUNET_SYSERR == success)
@@ -1701,15 +1790,10 @@ store_ticket_issue_cont (void *cls,
     GNUNET_SCHEDULER_add_now (&do_shutdown, NULL);
     return;
   }
-  env = GNUNET_MQ_msg_extra (irm,
-                             sizeof (struct GNUNET_IDENTITY_PROVIDER_Ticket2),
-                       GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_RESULT);
-  ticket = (struct GNUNET_IDENTITY_PROVIDER_Ticket2 *)&irm[1];
-  *ticket = handle->ticket;
-  irm->id = handle->r_id;
-
-  GNUNET_MQ_send (handle->client->mq,
-                  env);
+  send_ticket_result (handle->client,
+                      handle->r_id,
+                      &handle->ticket,
+                      handle->attrs);
   cleanup_ticket_issue_handle (handle);
 }
 
@@ -1717,9 +1801,9 @@ store_ticket_issue_cont (void *cls,
 
 int
 serialize_abe_keyinfo2 (const struct TicketIssueHandle *handle,
-                 const struct GNUNET_CRYPTO_AbeKey *rp_key,
-                 struct GNUNET_CRYPTO_EcdhePrivateKey **ecdh_privkey,
-                 char **result)
+                        const struct GNUNET_CRYPTO_AbeKey *rp_key,
+                        struct GNUNET_CRYPTO_EcdhePrivateKey **ecdh_privkey,
+                        char **result)
 {
   struct GNUNET_CRYPTO_EcdhePublicKey ecdh_pubkey;
   struct GNUNET_IDENTITY_PROVIDER_AttributeListEntry *le;
@@ -1729,12 +1813,12 @@ serialize_abe_keyinfo2 (const struct TicketIssueHandle 
*handle,
   char *write_ptr;
   char attrs_str_len;
   ssize_t size;
-  
+
   struct GNUNET_CRYPTO_SymmetricSessionKey skey;
   struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
   struct GNUNET_HashCode new_key_hash;
   ssize_t enc_size;
-  
+
   size = GNUNET_CRYPTO_cpabe_serialize_key (rp_key,
                                             (void**)&serialized_key);
   attrs_str_len = 0;
@@ -1889,7 +1973,7 @@ handle_ticket_issue_message (void *cls,
   ih = GNUNET_new (struct TicketIssueHandle);
   attrs_len = ntohs (im->attr_len);
   ih->attrs = attribute_list_deserialize ((char*)&im[1], attrs_len);
-  ih->r_id = im->id;
+  ih->r_id = ntohl (im->id);
   ih->client = idp;
   ih->identity = im->identity;
   GNUNET_CRYPTO_ecdsa_key_get_public (&ih->identity,
@@ -2488,6 +2572,234 @@ handle_iteration_next (void *cls,
   GNUNET_SERVICE_client_continue (idp->client);
 }
 
+/**
+ * Ticket iteration processor result
+ */
+enum ZoneIterationResult
+{
+  /**
+   * Iteration start.
+   */
+  IT_START = 0,
+
+  /**
+   * Found tickets,
+   * Continue to iterate with next iteration_next call
+   */
+  IT_SUCCESS_MORE_AVAILABLE = 1,
+
+  /**
+   * Iteration complete
+   */
+  IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE = 2
+};
+
+
+/**
+ * Context for ticket iteration
+ */
+struct TicketIterationProcResult
+{
+  /**
+   * The ticket iteration handle
+   */
+  struct TicketIteration *ti;
+
+  /**
+   * Iteration result: iteration done?
+   * #IT_SUCCESS_MORE_AVAILABLE:  if there may be more results overall but
+   * we got one for now and have sent it to the client
+   * #IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE: if there are no further results,
+   * #IT_START: if we are still trying to find a result.
+   */
+  int res_iteration_finished;
+
+};
+
+
+
+/**
+ * Process ticket from database
+ *
+ * @param cls struct TicketIterationProcResult
+ * @param ticket the ticket
+ * @param attrs the attributes
+ */
+static void
+ticket_iterate_proc (void *cls,
+                     const struct GNUNET_IDENTITY_PROVIDER_Ticket2 *ticket,
+                     const struct GNUNET_IDENTITY_PROVIDER_AttributeList 
*attrs)
+{
+  struct TicketIterationProcResult *proc = cls;
+
+  if (NULL == ticket)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Iteration done\n");
+    proc->res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
+    return;
+  }
+  if ((NULL == ticket) || (NULL == attrs))
+  {
+    /* error */
+    proc->res_iteration_finished = IT_START;
+    GNUNET_break (0);
+    return;
+  }
+  proc->res_iteration_finished = IT_SUCCESS_MORE_AVAILABLE;
+  send_ticket_result (proc->ti->client,
+                      proc->ti->r_id,
+                      ticket,
+                      attrs);
+
+}
+
+/**
+ * Perform ticket iteration step
+ *
+ * @param ti ticket iterator to process
+ */
+static void
+run_ticket_iteration_round (struct TicketIteration *ti)
+{
+  struct TicketIterationProcResult proc;
+  struct GNUNET_MQ_Envelope *env;
+  struct TicketResultMessage *trm;
+  int ret;
+
+  memset (&proc, 0, sizeof (proc));
+  proc.ti = ti;
+  proc.res_iteration_finished = IT_START;
+  while (IT_START == proc.res_iteration_finished)
+  {
+    if (GNUNET_SYSERR ==
+        (ret = TKT_database->iterate_tickets (TKT_database->cls,
+                                              &ti->identity,
+                                              ti->is_audience,
+                                              ti->offset,
+                                              &ticket_iterate_proc,
+                                              &proc)))
+    {
+      GNUNET_break (0);
+      break;
+    }
+    if (GNUNET_NO == ret)
+      proc.res_iteration_finished = IT_SUCCESS_NOT_MORE_RESULTS_AVAILABLE;
+    ti->offset++;
+  }
+  if (IT_SUCCESS_MORE_AVAILABLE == proc.res_iteration_finished)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "More results available\n");
+    return; /* more later */
+  }
+  /* send empty response to indicate end of list */
+  env = GNUNET_MQ_msg (trm,
+                       GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_RESULT);
+  trm->id = htonl (ti->r_id);
+  GNUNET_MQ_send (ti->client->mq,
+                  env);
+  GNUNET_CONTAINER_DLL_remove (ti->client->ticket_iter_head,
+                               ti->client->ticket_iter_tail,
+                               ti);
+  GNUNET_free (ti);
+}
+
+/**
+ * Handles a #GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_START 
message
+ *
+ * @param cls the client sending the message
+ * @param tis_msg message from the client
+ */
+static void
+handle_ticket_iteration_start (void *cls,
+                        const struct TicketIterationStartMessage *tis_msg)
+{
+  struct IdpClient *client = cls;
+  struct TicketIteration *ti;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Received TICKET_ITERATION_START message\n");
+  ti = GNUNET_new (struct TicketIteration);
+  ti->r_id = ntohl (tis_msg->id);
+  ti->offset = 0;
+  ti->client = client;
+  ti->identity = tis_msg->identity;
+  ti->is_audience = ntohl (tis_msg->is_audience);
+
+  GNUNET_CONTAINER_DLL_insert (client->ticket_iter_head,
+                               client->ticket_iter_tail,
+                               ti);
+  run_ticket_iteration_round (ti);
+  GNUNET_SERVICE_client_continue (client->client);
+}
+
+
+/**
+ * Handles a #GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_STOP 
message
+ *
+ * @param cls the client sending the message
+ * @param tis_msg message from the client
+ */
+static void
+handle_ticket_iteration_stop (void *cls,
+                       const struct TicketIterationStopMessage *tis_msg)
+{
+  struct IdpClient *client = cls;
+  struct TicketIteration *ti;
+  uint32_t rid;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Received `%s' message\n",
+              "TICKET_ITERATION_STOP");
+  rid = ntohl (tis_msg->id);
+  for (ti = client->ticket_iter_head; NULL != ti; ti = ti->next)
+    if (ti->r_id == rid)
+      break;
+  if (NULL == ti)
+  {
+    GNUNET_break (0);
+    GNUNET_SERVICE_client_drop (client->client);
+    return;
+  }
+  GNUNET_CONTAINER_DLL_remove (client->ticket_iter_head,
+                               client->ticket_iter_tail,
+                               ti);
+  GNUNET_free (ti);
+  GNUNET_SERVICE_client_continue (client->client);
+}
+
+
+/**
+ * Handles a #GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_NEXT 
message
+ *
+ * @param cls the client sending the message
+ * @param message message from the client
+ */
+static void
+handle_ticket_iteration_next (void *cls,
+                       const struct TicketIterationNextMessage *tis_msg)
+{
+  struct IdpClient *client = cls;
+  struct TicketIteration *ti;
+  uint32_t rid;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Received TICKET_ITERATION_NEXT message\n");
+  rid = ntohl (tis_msg->id);
+  for (ti = client->ticket_iter_head; NULL != ti; ti = ti->next)
+    if (ti->r_id == rid)
+      break;
+  if (NULL == ti)
+  {
+    GNUNET_break (0);
+    GNUNET_SERVICE_client_drop (client->client);
+    return;
+  }
+  run_ticket_iteration_round (ti);
+  GNUNET_SERVICE_client_continue (client->client);
+}
+
 
 
 
@@ -2504,6 +2816,7 @@ run (void *cls,
      const struct GNUNET_CONFIGURATION_Handle *c,
      struct GNUNET_SERVICE_Handle *server)
 {
+  char *database;
   cfg = c;
 
   stats = GNUNET_STATISTICS_create ("identity-provider", cfg);
@@ -2529,6 +2842,29 @@ run (void *cls,
                                              NULL,
                                              NULL);
 
+  /* Loading DB plugin */
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_string (cfg,
+                                             "identity-provider",
+                                             "database",
+                                             &database))
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "No database backend configured\n");
+  GNUNET_asprintf (&db_lib_name,
+                   "libgnunet_plugin_identity_provider_%s",
+                   database);
+  TKT_database = GNUNET_PLUGIN_load (db_lib_name,
+                                     (void *) cfg);
+  GNUNET_free (database);
+  if (NULL == TKT_database)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Could not load database backend `%s'\n",
+                db_lib_name);
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+
   if (GNUNET_OK ==
       GNUNET_CONFIGURATION_get_value_time (cfg,
                                            "identity-provider",
@@ -2645,5 +2981,18 @@ GNUNET_SERVICE_MAIN
                         GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_CONSUME_TICKET,
                         struct ConsumeTicketMessage,
                         NULL),
+ GNUNET_MQ_hd_fixed_size (ticket_iteration_start, 
+                          
GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_START,
+                          struct TicketIterationStartMessage,
+                          NULL),
+ GNUNET_MQ_hd_fixed_size (ticket_iteration_next, 
+                          
GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_NEXT,
+                          struct TicketIterationNextMessage,
+                          NULL),
+ GNUNET_MQ_hd_fixed_size (ticket_iteration_stop, 
+                          
GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_STOP,
+                          struct TicketIterationStopMessage,
+                          NULL),
+
  GNUNET_MQ_handler_end());
-/* end of gnunet-service-identity-provider.c */
+ /* end of gnunet-service-identity-provider.c */
diff --git a/src/identity-provider/identity-provider.conf 
b/src/identity-provider/identity-provider.conf
index bac8e69ed..826b2419e 100644
--- a/src/identity-provider/identity-provider.conf
+++ b/src/identity-provider/identity-provider.conf
@@ -10,3 +10,6 @@ UNIXPATH = 
$GNUNET_USER_RUNTIME_DIR/gnunet-service-identity-provider.sock
 UNIX_MATCH_UID = NO
 UNIX_MATCH_GID = YES
 TOKEN_EXPIRATION_INTERVAL = 30 m
+
+[identity-provider-sqlite]
+FILENAME = $GNUNET_DATA_HOME/identity-provider/sqlite.db
diff --git a/src/identity-provider/identity_attribute.c 
b/src/identity-provider/identity_attribute.c
index 916386754..1c5654946 100644
--- a/src/identity-provider/identity_attribute.c
+++ b/src/identity-provider/identity_attribute.c
@@ -125,7 +125,22 @@ attribute_list_deserialize (const char* data,
   return attrs;
 }
 
+void
+attribute_list_destroy (struct GNUNET_IDENTITY_PROVIDER_AttributeList *attrs)
+{
+  struct GNUNET_IDENTITY_PROVIDER_AttributeListEntry *le;
+  struct GNUNET_IDENTITY_PROVIDER_AttributeListEntry *tmp_le;
+
+  for (le = attrs->list_head; NULL != le;)
+  {
+    GNUNET_free (le->attribute);
+    tmp_le = le;
+    le = le->next;
+    GNUNET_free (tmp_le);
+  }
+  GNUNET_free (attrs);
 
+}
 
 size_t
 attribute_serialize_get_size (const struct GNUNET_IDENTITY_PROVIDER_Attribute 
*attr)
diff --git a/src/identity-provider/identity_attribute.h 
b/src/identity-provider/identity_attribute.h
index 00e520a38..d44f4c17f 100644
--- a/src/identity-provider/identity_attribute.h
+++ b/src/identity-provider/identity_attribute.h
@@ -58,6 +58,8 @@ struct Attribute
 size_t
 attribute_list_serialize_get_size (const struct 
GNUNET_IDENTITY_PROVIDER_AttributeList *attrs);
 
+void
+attribute_list_destroy (struct GNUNET_IDENTITY_PROVIDER_AttributeList *attrs);
 
 
 /**
diff --git a/src/identity-provider/identity_provider.h 
b/src/identity-provider/identity_provider.h
index dcad35118..434af4d8c 100644
--- a/src/identity-provider/identity_provider.h
+++ b/src/identity-provider/identity_provider.h
@@ -319,6 +319,70 @@ struct AttributeIterationStopMessage
 };
 
 /**
+ * Start a ticket iteration for the given identity
+ */
+struct TicketIterationStartMessage
+{
+  /**
+   * Message
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Unique identifier for this request (for key collisions).
+   */
+  uint32_t id GNUNET_PACKED;
+
+  /**
+   * Identity.
+   */
+  struct GNUNET_CRYPTO_EcdsaPublicKey identity;
+
+  /**
+   * Identity is audience or issuer
+   */
+  uint32_t is_audience GNUNET_PACKED;
+};
+
+
+/**
+ * Ask for next result of ticket iteration for the given operation
+ */
+struct TicketIterationNextMessage
+{
+  /**
+   * Type will be #GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_NEXT
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Unique identifier for this request (for key collisions).
+   */
+  uint32_t id GNUNET_PACKED;
+
+};
+
+
+/**
+ * Stop ticket iteration for the given operation
+ */
+struct TicketIterationStopMessage
+{
+  /**
+   * Type will be #GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_STOP
+   */
+  struct GNUNET_MessageHeader header;
+
+  /**
+   * Unique identifier for this request (for key collisions).
+   */
+  uint32_t id GNUNET_PACKED;
+
+};
+
+
+
+/**
  * Ticket issue message
  */
 struct TicketIssueMessage
diff --git a/src/identity-provider/plugin_identity_provider_sqlite.c 
b/src/identity-provider/plugin_identity_provider_sqlite.c
new file mode 100644
index 000000000..d05baa79d
--- /dev/null
+++ b/src/identity-provider/plugin_identity_provider_sqlite.c
@@ -0,0 +1,669 @@
+ /*
+  * This file is part of GNUnet
+  * Copyright (C) 2009-2017 GNUnet e.V.
+  *
+  * GNUnet is free software; you can redistribute it and/or modify
+  * it under the terms of the GNU General Public License as published
+  * by the Free Software Foundation; either version 3, or (at your
+  * option) any later version.
+  *
+  * GNUnet 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
+  * General Public License for more details.
+  *
+  * You should have received a copy of the GNU General Public License
+  * along with GNUnet; see the file COPYING.  If not, write to the
+  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+  * Boston, MA 02110-1301, USA.
+  */
+
+/**
+ * @file identity-provider/plugin_identity_provider_sqlite.c
+ * @brief sqlite-based idp backend
+ * @author Martin Schanzenbach
+ */
+
+#include "platform.h"
+#include "gnunet_identity_provider_service.h"
+#include "gnunet_identity_provider_plugin.h"
+#include "identity_attribute.h"
+#include "gnunet_sq_lib.h"
+#include <sqlite3.h>
+
+/**
+ * After how many ms "busy" should a DB operation fail for good?  A
+ * low value makes sure that we are more responsive to requests
+ * (especially PUTs).  A high value guarantees a higher success rate
+ * (SELECTs in iterate can take several seconds despite LIMIT=1).
+ *
+ * The default value of 1s should ensure that users do not experience
+ * huge latencies while at the same time allowing operations to
+ * succeed with reasonable probability.
+ */
+#define BUSY_TIMEOUT_MS 1000
+
+
+/**
+ * Log an error message at log-level 'level' that indicates
+ * a failure of the command 'cmd' on file 'filename'
+ * with the message given by strerror(errno).
+ */
+#define LOG_SQLITE(db, level, cmd) do { GNUNET_log_from (level, 
"namestore-identity-provider", _("`%s' failed at %s:%d with error: %s\n"), cmd, 
__FILE__, __LINE__, sqlite3_errmsg(db->dbh)); } while(0)
+
+#define LOG(kind,...) GNUNET_log_from (kind, "namestore-sqlite", __VA_ARGS__)
+
+
+/**
+ * Context for all functions in this plugin.
+ */
+struct Plugin
+{
+
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+  /**
+   * Database filename.
+   */
+  char *fn;
+
+  /**
+   * Native SQLite database handle.
+   */
+  sqlite3 *dbh;
+
+  /**
+   * Precompiled SQL to store ticket.
+   */
+  sqlite3_stmt *store_ticket;
+
+  /**
+   * Precompiled SQL to delete existing ticket.
+   */
+  sqlite3_stmt *delete_ticket;
+
+  /**
+   * Precompiled SQL to iterate tickets.
+   */
+  sqlite3_stmt *iterate_tickets;
+
+  /**
+   * Precompiled SQL to iterate tickets by audience.
+   */
+  sqlite3_stmt *iterate_tickets_by_audience;
+};
+
+
+/**
+ * @brief Prepare a SQL statement
+ *
+ * @param dbh handle to the database
+ * @param zSql SQL statement, UTF-8 encoded
+ * @param ppStmt set to the prepared statement
+ * @return 0 on success
+ */
+static int
+sq_prepare (sqlite3 *dbh,
+            const char *zSql,
+            sqlite3_stmt **ppStmt)
+{
+  char *dummy;
+  int result;
+
+  result =
+      sqlite3_prepare_v2 (dbh,
+                          zSql,
+                          strlen (zSql),
+                          ppStmt,
+                          (const char **) &dummy);
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Prepared `%s' / %p: %d\n",
+       zSql,
+       *ppStmt,
+       result);
+  return result;
+}
+
+/**
+ * Create our database indices.
+ *
+ * @param dbh handle to the database
+ */
+static void
+create_indices (sqlite3 * dbh)
+{
+  /* create indices */
+  if ( (SQLITE_OK !=
+       sqlite3_exec (dbh,
+                      "CREATE INDEX IF NOT EXISTS identity_reverse ON 
identity001tickets (identity,audience)",
+                     NULL, NULL, NULL)) ||
+       (SQLITE_OK !=
+       sqlite3_exec (dbh,
+                      "CREATE INDEX IF NOT EXISTS it_iter ON 
identity001tickets (rnd)",
+                     NULL, NULL, NULL)) )
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+        "Failed to create indices: %s\n",
+         sqlite3_errmsg (dbh));
+}
+
+
+
+#if 0
+#define CHECK(a) GNUNET_break(a)
+#define ENULL NULL
+#else
+#define ENULL &e
+#define ENULL_DEFINED 1
+#define CHECK(a) if (! (a)) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "%s\n", e); 
sqlite3_free(e); }
+#endif
+
+
+/**
+ * Initialize the database connections and associated
+ * data structures (create tables and indices
+ * as needed as well).
+ *
+ * @param plugin the plugin context (state for this module)
+ * @return #GNUNET_OK on success
+ */
+static int
+database_setup (struct Plugin *plugin)
+{
+  sqlite3_stmt *stmt;
+  char *afsdir;
+#if ENULL_DEFINED
+  char *e;
+#endif
+
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_filename (plugin->cfg,
+                                               "identity-provider-sqlite",
+                                               "FILENAME",
+                                               &afsdir))
+  {
+    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+                              "identity-provider-sqlite",
+                               "FILENAME");
+    return GNUNET_SYSERR;
+  }
+  if (GNUNET_OK !=
+      GNUNET_DISK_file_test (afsdir))
+  {
+    if (GNUNET_OK !=
+        GNUNET_DISK_directory_create_for_file (afsdir))
+    {
+      GNUNET_break (0);
+      GNUNET_free (afsdir);
+      return GNUNET_SYSERR;
+    }
+  }
+  /* afsdir should be UTF-8-encoded. If it isn't, it's a bug */
+  plugin->fn = afsdir;
+
+  /* Open database and precompile statements */
+  if (sqlite3_open (plugin->fn, &plugin->dbh) != SQLITE_OK)
+  {
+    LOG (GNUNET_ERROR_TYPE_ERROR,
+        _("Unable to initialize SQLite: %s.\n"),
+        sqlite3_errmsg (plugin->dbh));
+    return GNUNET_SYSERR;
+  }
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh,
+                       "PRAGMA temp_store=MEMORY", NULL, NULL,
+                       ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh,
+                       "PRAGMA synchronous=NORMAL", NULL, NULL,
+                       ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh,
+                       "PRAGMA legacy_file_format=OFF", NULL, NULL,
+                       ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh,
+                       "PRAGMA auto_vacuum=INCREMENTAL", NULL,
+                       NULL, ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh,
+                       "PRAGMA encoding=\"UTF-8\"", NULL,
+                       NULL, ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh,
+                       "PRAGMA locking_mode=EXCLUSIVE", NULL, NULL,
+                       ENULL));
+  CHECK (SQLITE_OK ==
+         sqlite3_exec (plugin->dbh,
+                       "PRAGMA page_size=4092", NULL, NULL,
+                       ENULL));
+
+  CHECK (SQLITE_OK ==
+         sqlite3_busy_timeout (plugin->dbh,
+                               BUSY_TIMEOUT_MS));
+
+
+  /* Create table */
+  CHECK (SQLITE_OK ==
+         sq_prepare (plugin->dbh,
+                     "SELECT 1 FROM sqlite_master WHERE tbl_name = 
'identity001tickets'",
+                     &stmt));
+  if ((sqlite3_step (stmt) == SQLITE_DONE) &&
+      (sqlite3_exec
+       (plugin->dbh,
+        "CREATE TABLE identity001tickets ("
+        " identity BLOB NOT NULL DEFAULT '',"
+        " audience BLOB NOT NULL DEFAULT '',"
+             " rnd INT8 NOT NULL DEFAULT '',"
+        " attributes BLOB NOT NULL DEFAULT ''"
+       ")",
+       NULL, NULL, NULL) != SQLITE_OK))
+  {
+    LOG_SQLITE (plugin, GNUNET_ERROR_TYPE_ERROR,
+                "sqlite3_exec");
+    sqlite3_finalize (stmt);
+    return GNUNET_SYSERR;
+  }
+  sqlite3_finalize (stmt);
+
+  create_indices (plugin->dbh);
+
+  if ( (SQLITE_OK !=
+        sq_prepare (plugin->dbh,
+                    "INSERT INTO identity001tickets (identity, audience, rnd, 
attributes)"
+                    " VALUES (?, ?, ?, ?)",
+                    &plugin->store_ticket)) ||
+       (SQLITE_OK !=
+        sq_prepare (plugin->dbh,
+                    "DELETE FROM identity001tickets WHERE identity=? AND 
rnd=?",
+                    &plugin->delete_ticket)) ||
+       (SQLITE_OK !=
+        sq_prepare (plugin->dbh,
+                    "SELECT identity,audience,rnd,attributes"
+                    " FROM identity001tickets WHERE identity=?"
+                    " ORDER BY rnd LIMIT 1 OFFSET ?",
+                    &plugin->iterate_tickets)) ||
+       (SQLITE_OK !=
+        sq_prepare (plugin->dbh,
+                    "SELECT identity,audience,rnd,attributes"
+                    " FROM identity001tickets WHERE audience=?"
+                    " ORDER BY rnd LIMIT 1 OFFSET ?",
+                    &plugin->iterate_tickets_by_audience)) ) 
+  {
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR,
+                "precompiling");
+    return GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
+}
+
+
+/**
+ * Shutdown database connection and associate data
+ * structures.
+ * @param plugin the plugin context (state for this module)
+ */
+static void
+database_shutdown (struct Plugin *plugin)
+{
+  int result;
+  sqlite3_stmt *stmt;
+
+  if (NULL != plugin->store_ticket)
+    sqlite3_finalize (plugin->store_ticket);
+  if (NULL != plugin->delete_ticket)
+    sqlite3_finalize (plugin->delete_ticket);
+  if (NULL != plugin->iterate_tickets)
+    sqlite3_finalize (plugin->iterate_tickets);
+  result = sqlite3_close (plugin->dbh);
+  if (result == SQLITE_BUSY)
+  {
+    LOG (GNUNET_ERROR_TYPE_WARNING,
+        _("Tried to close sqlite without finalizing all prepared 
statements.\n"));
+    stmt = sqlite3_next_stmt (plugin->dbh,
+                              NULL);
+    while (NULL != stmt)
+    {
+      GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+                       "sqlite",
+                       "Closing statement %p\n",
+                       stmt);
+      result = sqlite3_finalize (stmt);
+      if (result != SQLITE_OK)
+        GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
+                         "sqlite",
+                         "Failed to close statement %p: %d\n",
+                         stmt,
+                         result);
+      stmt = sqlite3_next_stmt (plugin->dbh,
+                                NULL);
+    }
+    result = sqlite3_close (plugin->dbh);
+  }
+  if (SQLITE_OK != result)
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR,
+                "sqlite3_close");
+
+  GNUNET_free_non_null (plugin->fn);
+}
+
+
+/**
+ * Store a ticket in the database.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param ticket the ticket to persist
+ * @param attrs attributes to persist
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+static int
+identity_provider_sqlite_store_ticket (void *cls,
+                                        const struct 
GNUNET_IDENTITY_PROVIDER_Ticket2 *ticket,
+                                        const struct 
GNUNET_IDENTITY_PROVIDER_AttributeList *attrs)
+{
+  struct Plugin *plugin = cls;
+  int n;
+  size_t attrs_size;
+  char *attrs_serialized;
+
+  attrs_size = attribute_list_serialize_get_size (attrs);
+
+  attrs_serialized = GNUNET_malloc (attrs_size);
+
+  attribute_list_serialize (attrs,
+                            attrs_serialized);
+
+  {  
+    struct GNUNET_SQ_QueryParam sparams[] = {
+      GNUNET_SQ_query_param_auto_from_type (&ticket->identity),
+      GNUNET_SQ_query_param_auto_from_type (&ticket->audience),
+      GNUNET_SQ_query_param_uint64 (&ticket->rnd),
+      GNUNET_SQ_query_param_fixed_size (attrs_serialized, attrs_size),
+      GNUNET_SQ_query_param_end
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_SQ_bind (plugin->store_ticket,
+                        sparams))
+    {
+      LOG_SQLITE (plugin,
+                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_bind_XXXX");
+      GNUNET_SQ_reset (plugin->dbh,
+                       plugin->store_ticket);
+      return GNUNET_SYSERR;
+    }
+    n = sqlite3_step (plugin->store_ticket);
+    GNUNET_SQ_reset (plugin->dbh,
+                     plugin->store_ticket);
+  }
+  switch (n)
+  {
+    case SQLITE_DONE:
+      GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+                       "sqlite",
+                       "Ticket stored\n");
+      return GNUNET_OK;
+    case SQLITE_BUSY:
+      LOG_SQLITE (plugin,
+                  GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_step");
+      return GNUNET_NO;
+    default:
+      LOG_SQLITE (plugin,
+                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_step");
+      return GNUNET_SYSERR;
+  }
+}
+
+
+/**
+ * Store a ticket in the database.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param ticket the ticket to delete
+ * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+ */
+static int
+identity_provider_sqlite_delete_ticket (void *cls,
+                                        const struct 
GNUNET_IDENTITY_PROVIDER_Ticket2 *ticket)
+{
+  struct Plugin *plugin = cls;
+  int n;
+
+  {  
+    struct GNUNET_SQ_QueryParam sparams[] = {
+      GNUNET_SQ_query_param_auto_from_type (&ticket->identity),
+      GNUNET_SQ_query_param_uint64 (&ticket->rnd),
+      GNUNET_SQ_query_param_end
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_SQ_bind (plugin->delete_ticket,
+                        sparams))
+    {
+      LOG_SQLITE (plugin,
+                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_bind_XXXX");
+      GNUNET_SQ_reset (plugin->dbh,
+                       plugin->store_ticket);
+      return GNUNET_SYSERR;
+    }
+    n = sqlite3_step (plugin->delete_ticket);
+    GNUNET_SQ_reset (plugin->dbh,
+                     plugin->delete_ticket);
+  }
+  switch (n)
+  {
+    case SQLITE_DONE:
+      GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+                       "sqlite",
+                       "Ticket deleted\n");
+      return GNUNET_OK;
+    case SQLITE_BUSY:
+      LOG_SQLITE (plugin,
+                  GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_step");
+      return GNUNET_NO;
+    default:
+      LOG_SQLITE (plugin,
+                  GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                  "sqlite3_step");
+      return GNUNET_SYSERR;
+  }
+}
+
+
+/**
+ * The given 'sqlite' statement has been prepared to be run.
+ * It will return a record which should be given to the iterator.
+ * Runs the statement and parses the returned record.
+ *
+ * @param plugin plugin context
+ * @param stmt to run (and then clean up)
+ * @param iter iterator to call with the result
+ * @param iter_cls closure for @a iter
+ * @return #GNUNET_OK on success, #GNUNET_NO if there were no results, 
#GNUNET_SYSERR on error
+ */
+static int
+get_ticket_and_call_iterator (struct Plugin *plugin,
+                              sqlite3_stmt *stmt,
+                              GNUNET_IDENTITY_PROVIDER_TicketIterator iter,
+                              void *iter_cls)
+{
+  struct GNUNET_IDENTITY_PROVIDER_Ticket2 ticket;
+  size_t attrs_size;
+  void *attrs_serialized;
+  int ret;
+  int sret;
+
+  ret = GNUNET_NO;
+  if (SQLITE_ROW == (sret = sqlite3_step (stmt)))
+  {
+    struct GNUNET_SQ_ResultSpec rs[] = {
+      GNUNET_SQ_result_spec_auto_from_type (&ticket.identity),
+      GNUNET_SQ_result_spec_auto_from_type (&ticket.audience),
+      GNUNET_SQ_result_spec_uint64 (&ticket.rnd),
+      GNUNET_SQ_result_spec_variable_size (&attrs_serialized, &attrs_size),
+      GNUNET_SQ_result_spec_end
+
+    };
+    ret = GNUNET_SQ_extract_result (stmt,
+                                    rs);
+    if (GNUNET_OK != ret)
+    {
+      GNUNET_break (0);
+      ret = GNUNET_SYSERR;
+    }
+    else
+    {
+      struct GNUNET_IDENTITY_PROVIDER_AttributeList *attrs;
+
+      attrs = attribute_list_deserialize (attrs_serialized, attrs_size);
+
+      if (NULL == attrs)
+      {
+        GNUNET_break (0);
+        ret = GNUNET_SYSERR;
+      }
+      else
+      {
+        if (NULL != iter)
+          iter (iter_cls,
+                &ticket,
+                attrs);
+        ret = GNUNET_YES;
+      }
+    }
+    GNUNET_SQ_cleanup_result (rs);
+  }
+  else
+  {
+    if (SQLITE_DONE != sret)
+      LOG_SQLITE (plugin,
+                  GNUNET_ERROR_TYPE_ERROR,
+                  "sqlite_step");
+  }
+  GNUNET_SQ_reset (plugin->dbh,
+                   stmt);
+  return ret;
+}
+
+/**
+ * Iterate over the results for a particular key and zone in the
+ * datastore.  Will return at most one result to the iterator.
+ *
+ * @param cls closure (internal context for the plugin)
+ * @param identity the issuing identity or audience (depending on audience 
switch)
+ * @param audience GNUNET_YES if identity is audience
+ * @param offset offset in the list of all matching records
+ * @param iter function to call with the result
+ * @param iter_cls closure for @a iter
+ * @return #GNUNET_OK on success, #GNUNET_NO if there were no results, 
#GNUNET_SYSERR on error
+ */
+static int
+identity_provider_sqlite_iterate_tickets (void *cls,
+                                          const struct 
GNUNET_CRYPTO_EcdsaPublicKey *identity,
+                                          int audience,
+                                          uint64_t offset,
+                                          
GNUNET_IDENTITY_PROVIDER_TicketIterator iter,
+                                          void *iter_cls)
+{
+  struct Plugin *plugin = cls;
+  sqlite3_stmt *stmt;
+  int err;
+
+  if (NULL == identity)
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  struct GNUNET_SQ_QueryParam params[] = {
+    GNUNET_SQ_query_param_auto_from_type (identity),
+    GNUNET_SQ_query_param_uint64 (&offset),
+    GNUNET_SQ_query_param_end
+  };
+  if (GNUNET_YES == audience)
+  {
+    stmt = plugin->iterate_tickets_by_audience;
+    err = GNUNET_SQ_bind (stmt,
+                          params);
+  }
+  else
+  {
+    stmt = plugin->iterate_tickets;
+    err = GNUNET_SQ_bind (stmt,
+                          params);
+  }
+  if (GNUNET_OK != err)
+  {
+    LOG_SQLITE (plugin,
+                GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
+                "sqlite3_bind_XXXX");
+    GNUNET_SQ_reset (plugin->dbh,
+                     stmt);
+    return GNUNET_SYSERR;
+  }
+  return get_ticket_and_call_iterator (plugin,
+                                       stmt,
+                                       iter,
+                                       iter_cls);
+}
+
+
+/**
+ * Entry point for the plugin.
+ *
+ * @param cls the "struct GNUNET_IDENTITY_PROVIDER_PluginEnvironment*"
+ * @return NULL on error, otherwise the plugin context
+ */
+void *
+libgnunet_plugin_identity_provider_sqlite_init (void *cls)
+{
+  static struct Plugin plugin;
+  const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
+  struct GNUNET_IDENTITY_PROVIDER_PluginFunctions *api;
+
+  if (NULL != plugin.cfg)
+    return NULL;                /* can only initialize once! */
+  memset (&plugin, 0, sizeof (struct Plugin));
+  plugin.cfg = cfg;
+  if (GNUNET_OK != database_setup (&plugin))
+  {
+    database_shutdown (&plugin);
+    return NULL;
+  }
+  api = GNUNET_new (struct GNUNET_IDENTITY_PROVIDER_PluginFunctions);
+  api->cls = &plugin;
+  api->store_ticket = &identity_provider_sqlite_store_ticket;
+  api->delete_ticket = &identity_provider_sqlite_delete_ticket;
+  api->iterate_tickets = &identity_provider_sqlite_iterate_tickets;
+  LOG (GNUNET_ERROR_TYPE_INFO,
+       _("Sqlite database running\n"));
+  return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ *
+ * @param cls the plugin context (as returned by "init")
+ * @return always NULL
+ */
+void *
+libgnunet_plugin_namestore_sqlite_done (void *cls)
+{
+  struct GNUNET_IDENTITY_PROVIDER_PluginFunctions *api = cls;
+  struct Plugin *plugin = api->cls;
+
+  database_shutdown (plugin);
+  plugin->cfg = NULL;
+  GNUNET_free (api);
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "sqlite plugin is finished\n");
+  return NULL;
+}
+
+/* end of plugin_identity_provider_sqlite.c */
diff --git a/src/include/gnunet_identity_provider_plugin.h 
b/src/include/gnunet_identity_provider_plugin.h
new file mode 100644
index 000000000..5867a5b80
--- /dev/null
+++ b/src/include/gnunet_identity_provider_plugin.h
@@ -0,0 +1,123 @@
+/*
+     This file is part of GNUnet
+     Copyright (C) 2012, 2013 GNUnet e.V.
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet 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
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
+*/
+
+/**
+ * @author Martin Schanzenbach
+ *
+ * @file
+ * Plugin API for the idp database backend
+ *
+ * @defgroup identity-provider-plugin  IdP service plugin API
+ * Plugin API for the idp database backend
+ * @{
+ */
+#ifndef GNUNET_IDENTITY_PROVIDER_PLUGIN_H
+#define GNUNET_IDENTITY_PROVIDER_PLUGIN_H
+
+#include "gnunet_util_lib.h"
+#include "gnunet_identity_provider_service.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#if 0                           /* keep Emacsens' auto-indent happy */
+}
+#endif
+#endif
+
+
+/**
+ * Function called by for each matching ticket.
+ *
+ * @param cls closure
+ * @param ticket the ticket
+ * @prarm attrs the attributes
+ */
+typedef void (*GNUNET_IDENTITY_PROVIDER_TicketIterator) (void *cls,
+                                                const struct 
GNUNET_IDENTITY_PROVIDER_Ticket2 *ticket,
+                                                const struct 
GNUNET_IDENTITY_PROVIDER_AttributeList *attrs);
+
+
+/**
+ * @brief struct returned by the initialization function of the plugin
+ */
+struct GNUNET_IDENTITY_PROVIDER_PluginFunctions
+{
+
+  /**
+   * Closure to pass to all plugin functions.
+   */
+  void *cls;
+
+  /**
+   * Store a ticket in the database.
+   *
+   * @param cls closure (internal context for the plugin)
+   * @param ticket the ticket to store
+   * @param attrs the attributes shared with the ticket
+   * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+   */
+  int (*store_ticket) (void *cls,
+                       const struct GNUNET_IDENTITY_PROVIDER_Ticket2 *ticket,
+      const struct GNUNET_IDENTITY_PROVIDER_AttributeList *attrs);
+
+  /**
+   * Delete a ticket from the database.
+   *
+   * @param cls closure (internal context for the plugin)
+   * @param ticket the ticket to store
+   * @return #GNUNET_OK on success, else #GNUNET_SYSERR
+   */
+  int (*delete_ticket) (void *cls,
+                       const struct GNUNET_IDENTITY_PROVIDER_Ticket2 *ticket);
+
+
+
+  /**
+   * Iterate over all tickets
+   *
+   * @param cls closure (internal context for the plugin)
+   * @param identity the identity
+   * @param audience GNUNET_YES if the identity is the audience of the ticket
+   *                 else it is considered the issuer
+   * @param iter function to call with the result
+   * @param iter_cls closure for @a iter
+   * @return #GNUNET_OK on success, #GNUNET_NO if there were no results, 
#GNUNET_SYSERR on error
+   */
+  int (*iterate_tickets) (void *cls,
+                         const struct GNUNET_CRYPTO_EcdsaPublicKey *identity,
+        int audience,
+                         uint64_t offset,
+                         GNUNET_IDENTITY_PROVIDER_TicketIterator iter, void 
*iter_cls);
+
+
+};
+
+
+#if 0                           /* keep Emacsens' auto-indent happy */
+{
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+/** @} */  /* end of group */
diff --git a/src/include/gnunet_identity_provider_service.h 
b/src/include/gnunet_identity_provider_service.h
index 049f891cc..02cd15959 100644
--- a/src/include/gnunet_identity_provider_service.h
+++ b/src/include/gnunet_identity_provider_service.h
@@ -336,17 +336,25 @@ GNUNET_IDENTITY_PROVIDER_get_attributes_stop (struct 
GNUNET_IDENTITY_PROVIDER_At
  * token
  *
  * @param cls closure
- * @param grant the label in GNS pointing to the token
  * @param ticket the ticket
- * @param token the issued token
- * @param name name assigned by the user for this ego,
- *                   NULL if the user just deleted the ego and it
- *                   must thus no longer be used
  */
 typedef void
 (*GNUNET_IDENTITY_PROVIDER_TicketCallback)(void *cls,
                             const struct GNUNET_IDENTITY_PROVIDER_Ticket2 
*ticket);
 
+/**
+ * Method called when issued tickets are retrieved. Also returns the attributes
+ * that were issued at the time.
+ *
+ * @param cls closure
+ * @param ticket the ticket
+ * @param attrs the attributes as list
+ */
+typedef void
+(*GNUNET_IDENTITY_PROVIDER_TicketResult)(void *cls,
+                            const struct GNUNET_IDENTITY_PROVIDER_Ticket2 
*ticket,
+                            const struct 
GNUNET_IDENTITY_PROVIDER_AttributeList *attrs);
+
 
 /**
  * Issues a ticket to another identity. The identity may use
@@ -389,7 +397,7 @@ GNUNET_IDENTITY_PROVIDER_idp_ticket_revoke (struct 
GNUNET_IDENTITY_PROVIDER_Hand
 
 
 
-/** TODO
+/**
  * Consumes an issued ticket. The ticket is persisted
  * and used to retrieve identity information from the issuer
  *
diff --git a/src/include/gnunet_protocols.h b/src/include/gnunet_protocols.h
index 63afeba8d..743a28946 100644
--- a/src/include/gnunet_protocols.h
+++ b/src/include/gnunet_protocols.h
@@ -2646,6 +2646,12 @@ extern "C"
 
 #define GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_CONSUME_TICKET 973
 
+#define GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_START 974
+
+#define GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_STOP 975
+
+#define GNUNET_MESSAGE_TYPE_IDENTITY_PROVIDER_TICKET_ITERATION_NEXT 976
+
 /**************************************************
  *
  * CREDENTIAL MESSAGE TYPES

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