2 This file is part of GNUnet
3 Copyright (C) 2017 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 * @file block/plugin_block_revocation.c
21 * @brief revocation for a block plugin
22 * @author Christian Grothoff
26 #include "gnunet_signatures.h"
27 #include "gnunet_block_plugin.h"
28 #include "gnunet_block_group_lib.h"
29 #include "revocation.h"
30 #include "gnunet_revocation_service.h"
32 #define DEBUG_REVOCATION GNUNET_EXTRA_LOGGING
35 * Number of bits we set per entry in the bloomfilter.
38 #define BLOOMFILTER_K 16
42 * How big is the BF we use for DHT blocks?
44 #define REVOCATION_BF_SIZE 8
48 * Context used inside the plugin.
50 struct InternalContext
53 unsigned int matching_bits;
59 * Create a new block group.
61 * @param ctx block context in which the block group is created
62 * @param type type of the block for which we are creating the group
63 * @param nonce random value used to seed the group creation
64 * @param raw_data optional serialized prior state of the group, NULL if unavailable/fresh
65 * @param raw_data_size number of bytes in @a raw_data, 0 if unavailable/fresh
66 * @param va variable arguments specific to @a type
67 * @return block group handle, NULL if block groups are not supported
68 * by this @a type of block (this is not an error)
70 static struct GNUNET_BLOCK_Group *
71 block_plugin_revocation_create_group (void *cls,
72 enum GNUNET_BLOCK_Type type,
81 guard = va_arg (va, const char *);
82 if (0 == strcmp (guard,
84 bf_size = GNUNET_BLOCK_GROUP_compute_bloomfilter_size (va_arg (va, unsigned int),
86 else if (0 == strcmp (guard,
88 bf_size = va_arg (va, unsigned int);
92 bf_size = REVOCATION_BF_SIZE;
94 GNUNET_break (NULL == va_arg (va, const char *));
95 return GNUNET_BLOCK_GROUP_bf_create (cls,
106 * Function called to validate a reply or a request. For
107 * request evaluation, simply pass "NULL" for the reply_block.
109 * @param cls our `struct InternalContext`
111 * @param type block type
112 * @param group block group to use
113 * @param eo control flags
114 * @param query original query (hash)
115 * @param xquery extrended query data (can be NULL, depending on type)
116 * @param xquery_size number of bytes in xquery
117 * @param reply_block response to validate
118 * @param reply_block_size number of bytes in reply block
119 * @return characterization of result
121 static enum GNUNET_BLOCK_EvaluationResult
122 block_plugin_revocation_evaluate (void *cls,
123 struct GNUNET_BLOCK_Context *ctx,
124 enum GNUNET_BLOCK_Type type,
125 struct GNUNET_BLOCK_Group *group,
126 enum GNUNET_BLOCK_EvaluationOptions eo,
127 const struct GNUNET_HashCode *query,
130 const void *reply_block,
131 size_t reply_block_size)
133 struct InternalContext *ic = cls;
134 struct GNUNET_HashCode chash;
135 const struct RevokeMessage *rm = reply_block;
137 if (NULL == reply_block)
138 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
139 if (reply_block_size != sizeof (*rm))
142 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
145 GNUNET_REVOCATION_check_pow (&rm->public_key,
150 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
153 GNUNET_CRYPTO_ecdsa_verify (GNUNET_SIGNATURE_PURPOSE_REVOCATION,
159 return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
161 GNUNET_CRYPTO_hash (&rm->public_key,
162 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
165 GNUNET_BLOCK_GROUP_bf_test_and_set (group,
167 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
168 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
173 * Function called to obtain the key for a block.
176 * @param type block type
177 * @param block block to get the key for
178 * @param block_size number of bytes in block
179 * @param key set to the key (query) for the given block
180 * @return #GNUNET_OK on success, #GNUNET_SYSERR if type not supported
181 * (or if extracting a key from a block of this type does not work)
184 block_plugin_revocation_get_key (void *cls,
185 enum GNUNET_BLOCK_Type type,
188 struct GNUNET_HashCode *key)
190 const struct RevokeMessage *rm = block;
192 if (block_size != sizeof (*rm))
195 return GNUNET_SYSERR;
197 GNUNET_CRYPTO_hash (&rm->public_key,
198 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
205 * Entry point for the plugin.
207 * @param cls the configuration to use
210 libgnunet_plugin_block_revocation_init (void *cls)
212 static enum GNUNET_BLOCK_Type types[] =
214 GNUNET_BLOCK_TYPE_REVOCATION,
215 GNUNET_BLOCK_TYPE_ANY /* end of list */
217 const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
218 struct GNUNET_BLOCK_PluginFunctions *api;
219 struct InternalContext *ic;
220 unsigned long long matching_bits;
223 GNUNET_CONFIGURATION_get_value_number (cfg,
229 api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
230 api->evaluate = &block_plugin_revocation_evaluate;
231 api->get_key = &block_plugin_revocation_get_key;
232 api->create_group = &block_plugin_revocation_create_group;
234 ic = GNUNET_new (struct InternalContext);
235 ic->matching_bits = (unsigned int) matching_bits;
242 * Exit point from the plugin.
245 libgnunet_plugin_block_revocation_done (void *cls)
247 struct GNUNET_BLOCK_PluginFunctions *api = cls;
248 struct InternalContext *ic = api->cls;
255 /* end of plugin_block_revocation.c */