GNUnet 0.21.2
fs_publish_ublock.c File Reference

publish a UBLOCK in GNUnet More...

#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_signatures.h"
#include "fs_publish_ublock.h"
#include "fs_api.h"
#include "fs_tree.h"
Include dependency graph for fs_publish_ublock.c:

Go to the source code of this file.

Data Structures

struct  GNUNET_FS_PublishUblockContext
 Context for 'ublock_put_cont'. More...


static void derive_ublock_encryption_key (struct GNUNET_CRYPTO_SymmetricSessionKey *skey, struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, const char *label, const struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
 Derive the key for symmetric encryption/decryption from the public key and the label. More...
void GNUNET_FS_ublock_decrypt_ (const void *input, size_t input_len, const struct GNUNET_CRYPTO_EcdsaPublicKey *ns, const char *label, void *output)
 Decrypt the given UBlock, storing the result in output. More...
static void ublock_put_cont (void *cls, int32_t success, struct GNUNET_TIME_Absolute min_expiration, const char *msg)
 Continuation of GNUNET_FS_publish_ublock_(). More...
static void run_cont (void *cls)
 Run the continuation. More...
struct GNUNET_FS_PublishUblockContextGNUNET_FS_publish_ublock_ (struct GNUNET_FS_Handle *h, struct GNUNET_DATASTORE_Handle *dsh, const char *label, const char *ulabel, const struct GNUNET_CRYPTO_EcdsaPrivateKey *ns, const struct GNUNET_FS_MetaData *meta, const struct GNUNET_FS_Uri *uri, const struct GNUNET_FS_BlockOptions *bo, enum GNUNET_FS_PublishOptions options, GNUNET_FS_UBlockContinuation cont, void *cont_cls)
 Publish a UBlock. More...
void GNUNET_FS_publish_ublock_cancel_ (struct GNUNET_FS_PublishUblockContext *uc)
 Abort UBlock publishing operation. More...

Detailed Description

publish a UBLOCK in GNUnet

See also and #2564
Krista Bennett
Christian Grothoff

Definition in file fs_publish_ublock.c.

Function Documentation

◆ derive_ublock_encryption_key()

static void derive_ublock_encryption_key ( struct GNUNET_CRYPTO_SymmetricSessionKey skey,
struct GNUNET_CRYPTO_SymmetricInitializationVector iv,
const char *  label,
const struct GNUNET_CRYPTO_EcdsaPublicKey pub 

Derive the key for symmetric encryption/decryption from the public key and the label.

skeywhere to store symmetric key
ivwhere to store the IV
labellabel to use for key derivation
pubpublic key to use for key derivation

Definition at line 46 of file fs_publish_ublock.c.

52 struct GNUNET_HashCode key;
54 /* derive key from 'label' and public key of the namespace */
56 GNUNET_CRYPTO_kdf (&key, sizeof(key),
57 "UBLOCK-ENC", strlen ("UBLOCK-ENC"),
58 label, strlen (label),
59 pub, sizeof(*pub),
60 NULL, 0));
struct GNUNET_HashCode key
The key used in the DHT.
static struct GNUNET_CRYPTO_EddsaPublicKey pub
Definition: gnunet-scrypt.c:47
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_kdf(void *result, size_t out_len, const void *xts, size_t xts_len, const void *skm, size_t skm_len,...)
Derive key.
Definition: crypto_kdf.c:62
void GNUNET_CRYPTO_hash_to_aes_key(const struct GNUNET_HashCode *hc, struct GNUNET_CRYPTO_SymmetricSessionKey *skey, struct GNUNET_CRYPTO_SymmetricInitializationVector *iv)
Convert a hashcode into a key.
Definition: crypto_hash.c:152
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
A 512-bit hashcode.

References GNUNET_assert, GNUNET_CRYPTO_hash_to_aes_key(), GNUNET_CRYPTO_kdf(), GNUNET_YES, key, and pub.

Referenced by GNUNET_FS_publish_ublock_(), and GNUNET_FS_ublock_decrypt_().

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◆ GNUNET_FS_ublock_decrypt_()

void GNUNET_FS_ublock_decrypt_ ( const void *  input,
size_t  input_len,
const struct GNUNET_CRYPTO_EcdsaPublicKey ns,
const char *  label,
void *  output 

Decrypt the given UBlock, storing the result in output.

inputinput data
input_lennumber of bytes in input
nspublic key under which the UBlock was stored
labellabel under which the UBlock was stored
outputwhere to write the result, has input_len bytes

Definition at line 66 of file fs_publish_ublock.c.

76 label, ns);
77 GNUNET_CRYPTO_symmetric_decrypt (input, input_len,
78 &skey, &iv,
79 output);
static void derive_ublock_encryption_key(struct GNUNET_CRYPTO_SymmetricSessionKey *skey, struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, const char *label, const struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
Derive the key for symmetric encryption/decryption from the public key and the label.
static struct GNUNET_NAMECACHE_Handle * ns
Handle to the namecache.
ssize_t GNUNET_CRYPTO_symmetric_decrypt(const void *block, size_t size, const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey, const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, void *result)
Decrypt a given block using a symmetric sessionkey.

References derive_ublock_encryption_key(), GNUNET_CRYPTO_symmetric_decrypt(), and ns.

Referenced by decrypt_block_with_keyword(), process_kblock_for_unindex(), and process_sblock().

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◆ ublock_put_cont()

static void ublock_put_cont ( void *  cls,
int32_t  success,
struct GNUNET_TIME_Absolute  min_expiration,
const char *  msg 

Continuation of GNUNET_FS_publish_ublock_().

clsclosure of type "struct GNUNET_FS_PublishUblockContext*"
successGNUNET_SYSERR on failure (including timeout/queue drop) GNUNET_NO if content was already there GNUNET_YES (or other positive value) on success
min_expirationminimum expiration time required for 0-priority content to be stored by the datacache at this time, zero for unknown, forever if we have no space for 0-priority content
msgNULL on success, otherwise an error message

Definition at line 123 of file fs_publish_ublock.c.

130 uc->qre = NULL;
131 uc->cont (uc->cont_cls, msg);
132 GNUNET_free (uc);
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
static struct GNUNET_FS_UnindexContext * uc
#define GNUNET_free(ptr)
Wrapper around free.
Context for 'ublock_put_cont'.

References GNUNET_free, msg, and uc.

Referenced by GNUNET_FS_publish_ublock_().

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◆ run_cont()

static void run_cont ( void *  cls)

Run the continuation.

clsthe struct GNUNET_FS_PublishUblockContext *

Definition at line 142 of file fs_publish_ublock.c.

146 uc->task = NULL;
147 uc->cont (uc->cont_cls, NULL);
148 GNUNET_free (uc);

References GNUNET_free, and uc.

Referenced by GNUNET_FS_publish_ublock_().

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◆ GNUNET_FS_publish_ublock_()

struct GNUNET_FS_PublishUblockContext * GNUNET_FS_publish_ublock_ ( struct GNUNET_FS_Handle h,
struct GNUNET_DATASTORE_Handle dsh,
const char *  label,
const char *  ulabel,
const struct GNUNET_CRYPTO_EcdsaPrivateKey ns,
const struct GNUNET_FS_MetaData meta,
const struct GNUNET_FS_Uri uri,
const struct GNUNET_FS_BlockOptions bo,
enum GNUNET_FS_PublishOptions  options,
GNUNET_FS_UBlockContinuation  cont,
void *  cont_cls 

Publish a UBlock.

hhandle to the file sharing subsystem
dshdatastore handle to use for storage operation
labelidentifier to use
ulabelupdate label to use, may be an empty string for none
nsnamespace to publish in
metametadata to use
uriURI to refer to in the UBlock
boper-block options
optionspublication options
cont_clsclosure for cont
NULL on error (cont will still be called)

Definition at line 153 of file fs_publish_ublock.c.

165 struct GNUNET_HashCode query;
170 char *uris;
171 size_t size;
172 char *kbe;
173 char *sptr;
174 ssize_t mdsize;
175 size_t slen;
176 size_t ulen;
177 struct UBlock *ub_plain;
178 struct UBlock *ub_enc;
180 /* compute ublock to publish */
181 if (NULL == meta)
182 mdsize = 0;
183 else
185 GNUNET_assert (mdsize >= 0);
187 slen = strlen (uris) + 1;
188 if (NULL == ulabel)
189 ulen = 1;
190 else
191 ulen = strlen (ulabel) + 1;
192 size = mdsize + sizeof(struct UBlock) + slen + ulen;
193 if (size > MAX_UBLOCK_SIZE)
194 {
196 mdsize = size - sizeof(struct UBlock) - (slen + ulen);
197 }
198 ub_plain = GNUNET_malloc (size);
199 kbe = (char *) &ub_plain[1];
200 if (NULL != ulabel)
201 GNUNET_memcpy (kbe, ulabel, ulen);
202 kbe += ulen;
203 GNUNET_memcpy (kbe, uris, slen);
204 kbe += slen;
205 GNUNET_free (uris);
206 sptr = kbe;
207 if (NULL != meta)
208 mdsize =
209 GNUNET_FS_meta_data_serialize (meta, &sptr, mdsize,
211 if (-1 == mdsize)
212 {
213 GNUNET_break (0);
214 GNUNET_free (ub_plain);
215 cont (cont_cls, _ ("Internal error."));
216 return NULL;
217 }
218 size = sizeof(struct UBlock) + slen + mdsize + ulen;
221 "Publishing under identifier `%s'\n",
222 label);
223 /* get public key of the namespace */
225 &pub);
227 label, &pub);
229 /* encrypt ublock */
230 ub_enc = GNUNET_malloc (size);
232 ulen + slen + mdsize,
233 &skey, &iv,
234 &ub_enc[1]);
235 GNUNET_free (ub_plain);
236 ub_enc->purpose.size = htonl (ulen + slen + mdsize
237 + sizeof(struct UBlock)
238 - sizeof(struct GNUNET_CRYPTO_EcdsaSignature));
241 /* derive signing-key from 'label' and public key of the namespace */
242 nsd = GNUNET_CRYPTO_ecdsa_private_key_derive (ns, label, "fs-ublock");
244 &ub_enc->verification_key);
247 &ub_enc->purpose,
248 &ub_enc->signature));
250 sizeof(ub_enc->verification_key),
251 &query);
252 GNUNET_free (nsd);
255 uc->cont = cont;
256 uc->cont_cls = cont_cls;
257 if (NULL != dsh)
258 {
259 uc->qre =
261 0,
262 &query,
263 ulen + slen + mdsize + sizeof(struct UBlock),
264 ub_enc,
270 -2, 1,
272 }
273 else
274 {
276 uc);
277 }
278 GNUNET_free (ub_enc);
279 return uc;
static void run_cont(void *cls)
Run the continuation.
static void ublock_put_cont(void *cls, int32_t success, struct GNUNET_TIME_Absolute min_expiration, const char *msg)
Continuation of GNUNET_FS_publish_ublock_().
static struct GNUNET_FS_Uri * uri
Value of URI provided on command-line (when not publishing a file but just creating UBlocks to refer ...
static struct GNUNET_FS_MetaData * meta
Meta-data provided via command-line option.
static struct GNUNET_FS_BlockOptions bo
Options we set for published blocks.
static struct GNUNET_DATASTORE_Handle * dsh
Datastore handle.
Maximum legal size for a ublock.
Definition: block_fs.h:45
struct GNUNET_CRYPTO_EcdsaPrivateKey * GNUNET_CRYPTO_ecdsa_private_key_derive(const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, const char *label, const char *context)
Derive a private key from a given private key and a label.
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecdsa_sign_(const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EcdsaSignature *sig)
ECDSA Sign a given block.
Definition: crypto_ecc.c:554
ssize_t GNUNET_CRYPTO_symmetric_encrypt(const void *block, size_t size, const struct GNUNET_CRYPTO_SymmetricSessionKey *sessionkey, const struct GNUNET_CRYPTO_SymmetricInitializationVector *iv, void *result)
Encrypt a block using a symmetric sessionkey.
void GNUNET_CRYPTO_ecdsa_key_get_public(const struct GNUNET_CRYPTO_EcdsaPrivateKey *priv, struct GNUNET_CRYPTO_EcdsaPublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:190
struct GNUNET_DATASTORE_QueueEntry * GNUNET_DATASTORE_put(struct GNUNET_DATASTORE_Handle *h, uint32_t rid, const struct GNUNET_HashCode *key, size_t size, const void *data, enum GNUNET_BLOCK_Type type, uint32_t priority, uint32_t anonymity, uint32_t replication, struct GNUNET_TIME_Absolute expiration, unsigned int queue_priority, unsigned int max_queue_size, GNUNET_DATASTORE_ContinuationWithStatus cont, void *cont_cls)
Store an item in the datastore.
char * GNUNET_FS_uri_to_string(const struct GNUNET_FS_Uri *uri)
Convert a URI to a UTF-8 String.
Definition: fs_uri.c:2034
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:41
#define GNUNET_log(kind,...)
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_malloc(size)
Wrapper around malloc.
ssize_t GNUNET_FS_meta_data_get_serialized_size(const struct GNUNET_FS_MetaData *md)
Get the size of the full meta-data in serialized form.
Definition: meta_data.c:858
ssize_t GNUNET_FS_meta_data_serialize(const struct GNUNET_FS_MetaData *md, char **target, size_t max, enum GNUNET_FS_MetaDataSerializationOptions opt)
Serialize meta-data to target.
Definition: meta_data.c:637
If not enough space is available, it is acceptable to only serialize some of the metadata.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1305
static unsigned int size
Size of the "table".
Definition: peer.c:68
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
Type of a block representing any type of search result (universal).
UBlock Signature, done using DSS, not ECC (GNUnet-FS)
uint32_t size
How many bytes does this signature sign? (including this purpose header); in network byte order (!...
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
Private ECC key encoded for transmission.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and ECDS...
an ECC signature using ECDSA
uint32_t anonymity_level
At which anonymity level should the block be shared? (0: no anonymity, 1: normal GAP,...
uint32_t content_priority
How important is it for us to store the block? If we run out of space, the highest-priority,...
uint32_t replication_level
How often should we try to migrate the block to other peers? Only used if "CONTENT_PUSHING" is set to...
struct GNUNET_TIME_Absolute expiration_time
At what time should the block expire? Data blocks (DBLOCKS and IBLOCKS) may still be used even if the...
universal block for keyword and namespace search results
Definition: block_fs.h:54
struct GNUNET_CRYPTO_EcdsaPublicKey verification_key
Public key used to sign this block.
Definition: block_fs.h:68
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
What is being signed and why?
Definition: block_fs.h:63
struct GNUNET_CRYPTO_EcdsaSignature signature
Signature using pseudonym and search keyword / identifier.
Definition: block_fs.h:58

References _, GNUNET_FS_BlockOptions::anonymity_level, bo, GNUNET_FS_BlockOptions::content_priority, derive_ublock_encryption_key(), dsh, GNUNET_FS_BlockOptions::expiration_time, GNUNET_assert, GNUNET_BLOCK_TYPE_FS_UBLOCK, GNUNET_break, GNUNET_CRYPTO_ecdsa_key_get_public(), GNUNET_CRYPTO_ecdsa_private_key_derive(), GNUNET_CRYPTO_ecdsa_sign_(), GNUNET_CRYPTO_hash(), GNUNET_CRYPTO_symmetric_encrypt(), GNUNET_DATASTORE_put(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_FS_meta_data_get_serialized_size(), GNUNET_FS_meta_data_serialize(), GNUNET_FS_META_DATA_SERIALIZE_PART, GNUNET_FS_uri_to_string(), GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_SIGNATURE_PURPOSE_FS_UBLOCK, MAX_UBLOCK_SIZE, meta, ns, pub, UBlock::purpose, GNUNET_CRYPTO_EccSignaturePurpose::purpose, GNUNET_FS_BlockOptions::replication_level, run_cont(), UBlock::signature, GNUNET_CRYPTO_EccSignaturePurpose::size, size, ublock_put_cont(), uc, uri, and UBlock::verification_key.

Referenced by GNUNET_FS_publish_sks(), and publish_ksk_cont().

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◆ GNUNET_FS_publish_ublock_cancel_()

void GNUNET_FS_publish_ublock_cancel_ ( struct GNUNET_FS_PublishUblockContext uc)

Abort UBlock publishing operation.

ucoperation to abort.

Definition at line 289 of file fs_publish_ublock.c.

291 if (NULL != uc->qre)
293 if (NULL != uc->task)
295 GNUNET_free (uc);
void GNUNET_DATASTORE_cancel(struct GNUNET_DATASTORE_QueueEntry *qe)
Cancel a datastore operation.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:981

References GNUNET_DATASTORE_cancel(), GNUNET_free, GNUNET_SCHEDULER_cancel(), and uc.

Referenced by GNUNET_FS_publish_ksk_cancel(), and GNUNET_FS_publish_sks_cancel().

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