GNUnet  0.10.x
Data Structures | Macros | Functions
plugin_block_revocation.c File Reference
#include "platform.h"
#include "gnunet_signatures.h"
#include "gnunet_block_plugin.h"
#include "gnunet_block_group_lib.h"
#include "revocation.h"
#include "gnunet_revocation_service.h"
Include dependency graph for plugin_block_revocation.c:

Go to the source code of this file.

Data Structures

struct  InternalContext
 Context used inside the plugin. More...
 

Macros

#define DEBUG_REVOCATION   GNUNET_EXTRA_LOGGING
 
#define BLOOMFILTER_K   16
 Number of bits we set per entry in the bloomfilter. More...
 
#define REVOCATION_BF_SIZE   8
 How big is the BF we use for DHT blocks? More...
 

Functions

static struct GNUNET_BLOCK_Groupblock_plugin_revocation_create_group (void *cls, enum GNUNET_BLOCK_Type type, uint32_t nonce, const void *raw_data, size_t raw_data_size, va_list va)
 Create a new block group. More...
 
static enum GNUNET_BLOCK_EvaluationResult block_plugin_revocation_evaluate (void *cls, struct GNUNET_BLOCK_Context *ctx, enum GNUNET_BLOCK_Type type, struct GNUNET_BLOCK_Group *group, enum GNUNET_BLOCK_EvaluationOptions eo, const struct GNUNET_HashCode *query, const void *xquery, size_t xquery_size, const void *reply_block, size_t reply_block_size)
 Function called to validate a reply or a request. More...
 
static int block_plugin_revocation_get_key (void *cls, enum GNUNET_BLOCK_Type type, const void *block, size_t block_size, struct GNUNET_HashCode *key)
 Function called to obtain the key for a block. More...
 
void * libgnunet_plugin_block_revocation_init (void *cls)
 Entry point for the plugin. More...
 
void * libgnunet_plugin_block_revocation_done (void *cls)
 Exit point from the plugin. More...
 

Macro Definition Documentation

◆ DEBUG_REVOCATION

#define DEBUG_REVOCATION   GNUNET_EXTRA_LOGGING

Definition at line 34 of file plugin_block_revocation.c.

◆ BLOOMFILTER_K

#define BLOOMFILTER_K   16

Number of bits we set per entry in the bloomfilter.

Do not change!

Definition at line 40 of file plugin_block_revocation.c.

Referenced by block_plugin_revocation_create_group().

◆ REVOCATION_BF_SIZE

#define REVOCATION_BF_SIZE   8

How big is the BF we use for DHT blocks?

Definition at line 46 of file plugin_block_revocation.c.

Referenced by block_plugin_revocation_create_group().

Function Documentation

◆ block_plugin_revocation_create_group()

static struct GNUNET_BLOCK_Group* block_plugin_revocation_create_group ( void *  cls,
enum GNUNET_BLOCK_Type  type,
uint32_t  nonce,
const void *  raw_data,
size_t  raw_data_size,
va_list  va 
)
static

Create a new block group.

Parameters
ctxblock context in which the block group is created
typetype of the block for which we are creating the group
noncerandom value used to seed the group creation
raw_dataoptional serialized prior state of the group, NULL if unavailable/fresh
raw_data_sizenumber of bytes in raw_data, 0 if unavailable/fresh
vavariable arguments specific to type
Returns
block group handle, NULL if block groups are not supported by this type of block (this is not an error)

Definition at line 70 of file plugin_block_revocation.c.

References BLOOMFILTER_K, GNUNET_BLOCK_GROUP_bf_create(), GNUNET_BLOCK_GROUP_compute_bloomfilter_size(), GNUNET_break, and REVOCATION_BF_SIZE.

Referenced by libgnunet_plugin_block_revocation_init().

76 {
77  unsigned int bf_size;
78  const char *guard;
79 
80  guard = va_arg(va, const char *);
81  if (0 == strcmp(guard,
82  "seen-set-size"))
83  bf_size = GNUNET_BLOCK_GROUP_compute_bloomfilter_size(va_arg(va, unsigned int),
85  else if (0 == strcmp(guard,
86  "filter-size"))
87  bf_size = va_arg(va, unsigned int);
88  else
89  {
90  GNUNET_break(0);
91  bf_size = REVOCATION_BF_SIZE;
92  }
93  GNUNET_break(NULL == va_arg(va, const char *));
95  bf_size,
97  type,
98  nonce,
99  raw_data,
100  raw_data_size);
101 }
#define REVOCATION_BF_SIZE
How big is the BF we use for DHT blocks?
struct GNUNET_BLOCK_Group * GNUNET_BLOCK_GROUP_bf_create(void *cls, size_t bf_size, unsigned int bf_k, enum GNUNET_BLOCK_Type type, uint32_t nonce, const void *raw_data, size_t raw_data_size)
Create a new block group that filters duplicates using a Bloom filter.
Definition: bg_bf.c:173
size_t GNUNET_BLOCK_GROUP_compute_bloomfilter_size(unsigned int entry_count, unsigned int k)
How many bytes should a bloomfilter be if we have already seen entry_count responses? Sized so that do not have to re-size the filter too often (to keep it cheap).
Definition: bg_bf.c:248
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define BLOOMFILTER_K
Number of bits we set per entry in the bloomfilter.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
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◆ block_plugin_revocation_evaluate()

static enum GNUNET_BLOCK_EvaluationResult block_plugin_revocation_evaluate ( void *  cls,
struct GNUNET_BLOCK_Context ctx,
enum GNUNET_BLOCK_Type  type,
struct GNUNET_BLOCK_Group group,
enum GNUNET_BLOCK_EvaluationOptions  eo,
const struct GNUNET_HashCode query,
const void *  xquery,
size_t  xquery_size,
const void *  reply_block,
size_t  reply_block_size 
)
static

Function called to validate a reply or a request.

For request evaluation, simply pass "NULL" for the reply_block.

Parameters
clsour struct InternalContext
ctxcontext
typeblock type
groupblock group to use
eocontrol flags
queryoriginal query (hash)
xqueryextrended query data (can be NULL, depending on type)
xquery_sizenumber of bytes in xquery
reply_blockresponse to validate
reply_block_sizenumber of bytes in reply block
Returns
characterization of result

Definition at line 121 of file plugin_block_revocation.c.

References GNUNET_BLOCK_EVALUATION_OK_DUPLICATE, GNUNET_BLOCK_EVALUATION_REQUEST_VALID, GNUNET_BLOCK_EVALUATION_RESULT_INVALID, GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED, GNUNET_BLOCK_GROUP_bf_test_and_set(), GNUNET_break_op, GNUNET_CRYPTO_ecdsa_verify(), GNUNET_CRYPTO_hash(), GNUNET_OK, GNUNET_REVOCATION_check_pow(), GNUNET_SIGNATURE_PURPOSE_REVOCATION, GNUNET_YES, InternalContext::matching_bits, RevokeMessage::proof_of_work, RevokeMessage::public_key, RevokeMessage::purpose, and RevokeMessage::signature.

Referenced by libgnunet_plugin_block_revocation_init().

131 {
132  struct InternalContext *ic = cls;
133  struct GNUNET_HashCode chash;
134  const struct RevokeMessage *rm = reply_block;
135 
136  if (NULL == reply_block)
138  if (reply_block_size != sizeof(*rm))
139  {
140  GNUNET_break_op(0);
142  }
143  if (GNUNET_YES !=
145  rm->proof_of_work,
146  ic->matching_bits))
147  {
148  GNUNET_break_op(0);
150  }
151  if (GNUNET_OK !=
153  &rm->purpose,
154  &rm->signature,
155  &rm->public_key))
156  {
157  GNUNET_break_op(0);
159  }
161  sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey),
162  &chash);
163  if (GNUNET_YES ==
165  &chash))
168 }
Block does not match query (invalid result)
struct GNUNET_CRYPTO_EcdsaSignature signature
Signature confirming revocation.
Definition: revocation.h:96
int GNUNET_CRYPTO_ecdsa_verify(uint32_t purpose, const struct GNUNET_CRYPTO_EccSignaturePurpose *validate, const struct GNUNET_CRYPTO_EcdsaSignature *sig, const struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
Verify ECDSA signature.
Definition: crypto_ecc.c:1048
Context used inside the plugin.
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Must have purpose GNUNET_SIGNATURE_PURPOSE_REVOCATION, size expands over the public key...
Definition: revocation.h:102
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
Revoke key.
Definition: revocation.h:77
Valid result, but suppressed because it is a duplicate.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:44
uint64_t proof_of_work
Number that causes a hash collision with the public_key.
Definition: revocation.h:91
A 512-bit hashcode.
#define GNUNET_SIGNATURE_PURPOSE_REVOCATION
Signature for confirming a key revocation.
Specified block type not supported by this plugin.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and ECDS...
struct GNUNET_CRYPTO_EcdsaPublicKey public_key
Key to revoke.
Definition: revocation.h:107
#define GNUNET_YES
Definition: gnunet_common.h:77
int GNUNET_BLOCK_GROUP_bf_test_and_set(struct GNUNET_BLOCK_Group *bg, const struct GNUNET_HashCode *hc)
Test if hc is contained in the Bloom filter of bg.
Definition: bg_bf.c:212
Query is valid, no reply given.
int GNUNET_REVOCATION_check_pow(const struct GNUNET_CRYPTO_EcdsaPublicKey *key, uint64_t pow, unsigned int matching_bits)
Check if the given proof-of-work value would be acceptable for revoking the given key...
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◆ block_plugin_revocation_get_key()

static int block_plugin_revocation_get_key ( void *  cls,
enum GNUNET_BLOCK_Type  type,
const void *  block,
size_t  block_size,
struct GNUNET_HashCode key 
)
static

Function called to obtain the key for a block.

Parameters
clsclosure
typeblock type
blockblock to get the key for
block_sizenumber of bytes in block
keyset to the key (query) for the given block
Returns
GNUNET_OK on success, GNUNET_SYSERR if type not supported (or if extracting a key from a block of this type does not work)

Definition at line 183 of file plugin_block_revocation.c.

References GNUNET_break_op, GNUNET_CRYPTO_hash(), GNUNET_OK, GNUNET_SYSERR, and RevokeMessage::public_key.

Referenced by libgnunet_plugin_block_revocation_init().

188 {
189  const struct RevokeMessage *rm = block;
190 
191  if (block_size != sizeof(*rm))
192  {
193  GNUNET_break_op(0);
194  return GNUNET_SYSERR;
195  }
197  sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey),
198  key);
199  return GNUNET_OK;
200 }
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
Revoke key.
Definition: revocation.h:77
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:44
#define GNUNET_SYSERR
Definition: gnunet_common.h:76
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and ECDS...
struct GNUNET_CRYPTO_EcdsaPublicKey public_key
Key to revoke.
Definition: revocation.h:107
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◆ libgnunet_plugin_block_revocation_init()

void* libgnunet_plugin_block_revocation_init ( void *  cls)

Entry point for the plugin.

Parameters
clsthe configuration to use

Definition at line 209 of file plugin_block_revocation.c.

References block_plugin_revocation_create_group(), block_plugin_revocation_evaluate(), block_plugin_revocation_get_key(), cfg, GNUNET_BLOCK_PluginFunctions::cls, GNUNET_BLOCK_PluginFunctions::create_group, GNUNET_BLOCK_PluginFunctions::evaluate, GNUNET_BLOCK_PluginFunctions::get_key, GNUNET_BLOCK_TYPE_ANY, GNUNET_BLOCK_TYPE_REVOCATION, GNUNET_CONFIGURATION_get_value_number(), GNUNET_new, GNUNET_OK, InternalContext::matching_bits, and GNUNET_BLOCK_PluginFunctions::types.

210 {
211  static enum GNUNET_BLOCK_Type types[] =
212  {
214  GNUNET_BLOCK_TYPE_ANY /* end of list */
215  };
216  const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
217  struct GNUNET_BLOCK_PluginFunctions *api;
218  struct InternalContext *ic;
219  unsigned long long matching_bits;
220 
221  if (GNUNET_OK !=
223  "REVOCATION",
224  "WORKBITS",
225  &matching_bits))
226  return NULL;
227 
232  api->types = types;
233  ic = GNUNET_new(struct InternalContext);
234  ic->matching_bits = (unsigned int)matching_bits;
235  api->cls = ic;
236  return api;
237 }
static struct GNUNET_BLOCK_Group * block_plugin_revocation_create_group(void *cls, enum GNUNET_BLOCK_Type type, uint32_t nonce, const void *raw_data, size_t raw_data_size, va_list va)
Create a new block group.
int GNUNET_CONFIGURATION_get_value_number(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, unsigned long long *number)
Get a configuration value that should be a number.
enum GNUNET_BLOCK_Type * types
0-terminated array of block types supported by this plugin.
Any type of block, used as a wildcard when searching.
static enum GNUNET_BLOCK_EvaluationResult block_plugin_revocation_evaluate(void *cls, struct GNUNET_BLOCK_Context *ctx, enum GNUNET_BLOCK_Type type, struct GNUNET_BLOCK_Group *group, enum GNUNET_BLOCK_EvaluationOptions eo, const struct GNUNET_HashCode *query, const void *xquery, size_t xquery_size, const void *reply_block, size_t reply_block_size)
Function called to validate a reply or a request.
GNUNET_BLOCK_EvaluationFunction evaluate
Main function of a block plugin.
GNUNET_BLOCK_Type
Blocks in the datastore and the datacache must have a unique type.
Block type for a revocation message by which a key is revoked.
Each plugin is required to return a pointer to a struct of this type as the return value from its ent...
Context used inside the plugin.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static int block_plugin_revocation_get_key(void *cls, enum GNUNET_BLOCK_Type type, const void *block, size_t block_size, struct GNUNET_HashCode *key)
Function called to obtain the key for a block.
static struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
Definition: gnunet-arm.c:104
GNUNET_BLOCK_GroupCreateFunction create_group
Create a block group to process a bunch of blocks in a shared context (i.e.
GNUNET_BLOCK_GetKeyFunction get_key
Obtain the key for a given block (if possible).
configuration data
Definition: configuration.c:83
static unsigned long long matching_bits
Number of matching bits required for revocation.
void * cls
Closure for all of the callbacks.
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◆ libgnunet_plugin_block_revocation_done()

void* libgnunet_plugin_block_revocation_done ( void *  cls)

Exit point from the plugin.

Definition at line 244 of file plugin_block_revocation.c.

References GNUNET_BLOCK_PluginFunctions::cls, and GNUNET_free.

245 {
246  struct GNUNET_BLOCK_PluginFunctions *api = cls;
247  struct InternalContext *ic = api->cls;
248 
249  GNUNET_free(ic);
250  GNUNET_free(api);
251  return NULL;
252 }
Each plugin is required to return a pointer to a struct of this type as the return value from its ent...
Context used inside the plugin.
void * cls
Closure for all of the callbacks.
#define GNUNET_free(ptr)
Wrapper around free.