GNUnet 0.21.0
fs_publish_ublock.c
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2009, 2010, 2012, 2013 GNUnet e.V.
4
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.
9
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.
14
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/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
28#include "platform.h"
29#include "gnunet_constants.h"
30#include "gnunet_signatures.h"
31#include "fs_publish_ublock.h"
32#include "fs_api.h"
33#include "fs_tree.h"
34
35
45static void
48 *iv,
49 const char *label,
51{
52 struct GNUNET_HashCode key;
53
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));
62}
63
64
65void
66GNUNET_FS_ublock_decrypt_ (const void *input,
67 size_t input_len,
68 const struct GNUNET_CRYPTO_EcdsaPublicKey *ns,
69 const char *label,
70 void *output)
71{
74
76 label, ns);
77 GNUNET_CRYPTO_symmetric_decrypt (input, input_len,
78 &skey, &iv,
79 output);
80}
81
82
87{
92
96 void *cont_cls;
97
102
107};
108
109
122static void
124 int32_t success,
126 const char *msg)
127{
129
130 uc->qre = NULL;
131 uc->cont (uc->cont_cls, msg);
132 GNUNET_free (uc);
133}
134
135
141static void
142run_cont (void *cls)
143{
145
146 uc->task = NULL;
147 uc->cont (uc->cont_cls, NULL);
148 GNUNET_free (uc);
149}
150
151
155 const char *label,
156 const char *ulabel,
157 const struct GNUNET_CRYPTO_EcdsaPrivateKey *ns,
158 const struct GNUNET_FS_MetaData *meta,
159 const struct GNUNET_FS_Uri *uri,
160 const struct GNUNET_FS_BlockOptions *bo,
163{
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;
179
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;
219
221 "Publishing under identifier `%s'\n",
222 label);
223 /* get public key of the namespace */
225 &pub);
227 label, &pub);
228
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));
240
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);
253
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;
280}
281
282
288void
290{
291 if (NULL != uc->qre)
293 if (NULL != uc->task)
295 GNUNET_free (uc);
296}
297
298
299/* end of fs_publish_ublock.c */
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
shared definitions for the FS library
static void run_cont(void *cls)
Run the continuation.
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.
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.
void GNUNET_FS_publish_ublock_cancel_(struct GNUNET_FS_PublishUblockContext *uc)
Abort UBlock publishing operation.
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_().
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.
publish a UBLOCK in GNUnet
void(* GNUNET_FS_UBlockContinuation)(void *cls, const char *emsg)
Signature of a function called as the continuation of a UBlock publication.
Merkle-tree-ish-CHK file encoding for GNUnet.
static struct GNUNET_ARM_Handle * h
Connection with ARM.
Definition: gnunet-arm.c:99
struct GNUNET_HashCode key
The key used in the DHT.
static struct GNUNET_NAMECACHE_Handle * ns
Handle to the namecache.
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_CRYPTO_EddsaPublicKey pub
Definition: gnunet-scrypt.c:47
static struct GNUNET_TIME_Absolute min_expiration
Minimum time that content should have to not be discarded instantly (time stamp of any content that w...
static struct GNUNET_DATASTORE_Handle * dsh
Datastore handle.
static struct GNUNET_FS_UnindexContext * uc
#define MAX_UBLOCK_SIZE
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:536
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:187
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.
void GNUNET_DATASTORE_cancel(struct GNUNET_DATASTORE_QueueEntry *qe)
Cancel a datastore operation.
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.
GNUNET_FS_PublishOptions
Options for publishing.
char * GNUNET_FS_uri_to_string(const struct GNUNET_FS_Uri *uri)
Convert a URI to a UTF-8 String.
Definition: fs_uri.c:2017
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
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:70
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_log(kind,...)
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
@ GNUNET_OK
@ GNUNET_YES
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
@ GNUNET_ERROR_TYPE_DEBUG
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
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
@ GNUNET_FS_META_DATA_SERIALIZE_PART
If not enough space is available, it is acceptable to only serialize some of the metadata.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:975
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:1299
static unsigned int size
Size of the "table".
Definition: peer.c:68
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
@ GNUNET_BLOCK_TYPE_FS_UBLOCK
Type of a block representing any type of search result (universal).
#define GNUNET_SIGNATURE_PURPOSE_FS_UBLOCK
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
Handle to the datastore service.
Entry in our priority queue.
Settings for publishing a block (which may of course also apply to an entire directory or file).
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...
Master context for most FS operations.
Definition: fs_api.h:1070
Meta data to associate with a file, directory or namespace.
Definition: meta_data.c:92
Context for 'ublock_put_cont'.
struct GNUNET_DATASTORE_QueueEntry * qre
Handle for active datastore operation.
void * cont_cls
Closure of 'cont'.
struct GNUNET_SCHEDULER_Task * task
Task to run continuation asynchronously.
GNUNET_FS_UBlockContinuation cont
Function to call when done.
A Universal Resource Identifier (URI), opaque.
Definition: fs_api.h:167
A 512-bit hashcode.
Entry in list of pending tasks.
Definition: scheduler.c:136
Time for absolute times used by GNUnet, in microseconds.
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