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-rw-r--r--src/mint-lib/mint_api_refresh_link.c482
1 files changed, 0 insertions, 482 deletions
diff --git a/src/mint-lib/mint_api_refresh_link.c b/src/mint-lib/mint_api_refresh_link.c
deleted file mode 100644
index dcd2326ca..000000000
--- a/src/mint-lib/mint_api_refresh_link.c
+++ /dev/null
@@ -1,482 +0,0 @@
-/*
- This file is part of TALER
- Copyright (C) 2015, 2016 GNUnet e.V.
-
- TALER 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.
-
- TALER 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
- TALER; see the file COPYING. If not, If not, see
- <http://www.gnu.org/licenses/>
-*/
-/**
- * @file mint-lib/mint_api_refresh_link.c
- * @brief Implementation of the /refresh/link request of the mint's HTTP API
- * @author Christian Grothoff
- */
-#include "platform.h"
-#include <curl/curl.h>
-#include <jansson.h>
-#include <microhttpd.h> /* just for HTTP status codes */
-#include <gnunet/gnunet_util_lib.h>
-#include "taler_mint_service.h"
-#include "mint_api_json.h"
-#include "mint_api_context.h"
-#include "mint_api_handle.h"
-#include "taler_signatures.h"
-
-
-/**
- * @brief A /refresh/link Handle
- */
-struct TALER_MINT_RefreshLinkHandle
-{
-
- /**
- * The connection to mint this request handle will use
- */
- struct TALER_MINT_Handle *mint;
-
- /**
- * The url for this request.
- */
- char *url;
-
- /**
- * Handle for the request.
- */
- struct MAC_Job *job;
-
- /**
- * Function to call with the result.
- */
- TALER_MINT_RefreshLinkCallback link_cb;
-
- /**
- * Closure for @e cb.
- */
- void *link_cb_cls;
-
- /**
- * Download buffer
- */
- struct MAC_DownloadBuffer db;
-
- /**
- * Private key of the coin, required to decode link information.
- */
- struct TALER_CoinSpendPrivateKeyP coin_priv;
-
-};
-
-
-/**
- * Parse the provided linkage data from the "200 OK" response
- * for one of the coins.
- *
- * @param rlh refresh link handle
- * @param json json reply with the data for one coin
- * @param trans_pub our transfer public key
- * @param secret_enc encrypted key to decrypt link data
- * @param[out] coin_priv where to return private coin key
- * @param[out] sig where to return private coin signature
- * @param[out] pub where to return the public key for the coin
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
- */
-static int
-parse_refresh_link_coin (const struct TALER_MINT_RefreshLinkHandle *rlh,
- json_t *json,
- const struct TALER_TransferPublicKeyP *trans_pub,
- const struct TALER_EncryptedLinkSecretP *secret_enc,
- struct TALER_CoinSpendPrivateKeyP *coin_priv,
- struct TALER_DenominationSignature *sig,
- struct TALER_DenominationPublicKey *pub)
-{
- void *link_enc;
- size_t link_enc_size;
- struct GNUNET_CRYPTO_rsa_Signature *bsig;
- struct GNUNET_CRYPTO_rsa_PublicKey *rpub;
- struct MAJ_Specification spec[] = {
- MAJ_spec_varsize ("link_enc", &link_enc, &link_enc_size),
- MAJ_spec_rsa_public_key ("denom_pub", &rpub),
- MAJ_spec_rsa_signature ("ev_sig", &bsig),
- MAJ_spec_end
- };
- struct TALER_RefreshLinkEncrypted *rle;
- struct TALER_RefreshLinkDecrypted *rld;
- struct TALER_LinkSecretP secret;
-
- /* parse reply */
- if (GNUNET_OK !=
- MAJ_parse_json (json,
- spec))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
-
- /* decode and decrypt link data */
- rle = TALER_refresh_link_encrypted_decode (link_enc,
- link_enc_size);
- if (NULL == rle)
- {
- GNUNET_break_op (0);
- MAJ_parse_free (spec);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- TALER_link_decrypt_secret2 (secret_enc,
- trans_pub,
- &rlh->coin_priv,
- &secret))
- {
- GNUNET_break_op (0);
- MAJ_parse_free (spec);
- return GNUNET_SYSERR;
- }
- rld = TALER_refresh_decrypt (rle,
- &secret);
- if (NULL == rld)
- {
- GNUNET_break_op (0);
- MAJ_parse_free (spec);
- return GNUNET_SYSERR;
- }
-
- /* extract coin and signature */
- *coin_priv = rld->coin_priv;
- sig->rsa_signature
- = GNUNET_CRYPTO_rsa_unblind (bsig,
- rld->blinding_key.rsa_blinding_key,
- rpub);
-
- /* clean up */
- GNUNET_free (rld);
- pub->rsa_public_key = GNUNET_CRYPTO_rsa_public_key_dup (rpub);
- MAJ_parse_free (spec);
- return GNUNET_OK;
-}
-
-
-/**
- * Parse the provided linkage data from the "200 OK" response
- * for one of the coins.
- *
- * @param[in,out] rlh refresh link handle (callback may be zero'ed out)
- * @param json json reply with the data for one coin
- * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
- */
-static int
-parse_refresh_link_ok (struct TALER_MINT_RefreshLinkHandle *rlh,
- json_t *json)
-{
- unsigned int session;
- unsigned int num_coins;
- int ret;
-
- if (! json_is_array (json))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- num_coins = 0;
- /* Theoretically, a coin may have been melted repeatedly
- into different sessions; so the response is an array
- which contains information by melting session. That
- array contains another array. However, our API returns
- a single 1d array, so we flatten the 2d array that is
- returned into a single array. Note that usually a coin
- is melted at most once, and so we'll only run this
- loop once for 'session=0' in most cases.
-
- num_coins tracks the size of the 1d array we return,
- whilst 'i' and 'session' track the 2d array. */
- for (session=0;session<json_array_size (json); session++)
- {
- json_t *jsona;
- struct MAJ_Specification spec[] = {
- MAJ_spec_json ("new_coins", &jsona),
- MAJ_spec_end
- };
-
- if (GNUNET_OK !=
- MAJ_parse_json (json_array_get (json,
- session),
- spec))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (! json_is_array (jsona))
- {
- GNUNET_break_op (0);
- MAJ_parse_free (spec);
- return GNUNET_SYSERR;
- }
-
- /* count all coins over all sessions */
- num_coins += json_array_size (jsona);
- MAJ_parse_free (spec);
- }
- /* Now that we know how big the 1d array is, allocate
- and fill it. */
- {
- unsigned int off_coin; /* index into 1d array */
- unsigned int i;
- struct TALER_CoinSpendPrivateKeyP coin_privs[num_coins];
- struct TALER_DenominationSignature sigs[num_coins];
- struct TALER_DenominationPublicKey pubs[num_coins];
-
- memset (sigs, 0, sizeof (sigs));
- memset (pubs, 0, sizeof (pubs));
- off_coin = 0;
- for (session=0;session<json_array_size (json); session++)
- {
- json_t *jsona;
- struct TALER_TransferPublicKeyP trans_pub;
- struct TALER_EncryptedLinkSecretP secret_enc;
- struct MAJ_Specification spec[] = {
- MAJ_spec_json ("new_coins", &jsona),
- MAJ_spec_fixed_auto ("transfer_pub", &trans_pub),
- MAJ_spec_fixed_auto ("secret_enc", &secret_enc),
- MAJ_spec_end
- };
-
- if (GNUNET_OK !=
- MAJ_parse_json (json_array_get (json,
- session),
- spec))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (! json_is_array (jsona))
- {
- GNUNET_break_op (0);
- MAJ_parse_free (spec);
- return GNUNET_SYSERR;
- }
-
- /* decode all coins */
- for (i=0;i<json_array_size (jsona);i++)
- {
- if (GNUNET_OK !=
- parse_refresh_link_coin (rlh,
- json_array_get (jsona,
- i),
- &trans_pub,
- &secret_enc,
- &coin_privs[i+off_coin],
- &sigs[i+off_coin],
- &pubs[i+off_coin]))
- {
- GNUNET_break_op (0);
- break;
- }
- }
- /* check if we really got all, then invoke callback */
- off_coin += i;
- if (i != json_array_size (jsona))
- {
- GNUNET_break_op (0);
- ret = GNUNET_SYSERR;
- MAJ_parse_free (spec);
- break;
- }
- MAJ_parse_free (spec);
- } /* end of for (session) */
-
- if (off_coin == num_coins)
- {
- rlh->link_cb (rlh->link_cb_cls,
- MHD_HTTP_OK,
- num_coins,
- coin_privs,
- sigs,
- pubs,
- json);
- rlh->link_cb = NULL;
- ret = GNUNET_OK;
- }
- else
- {
- GNUNET_break_op (0);
- ret = GNUNET_SYSERR;
- }
-
- /* clean up */
- for (i=0;i<off_coin;i++)
- {
- if (NULL != sigs[i].rsa_signature)
- GNUNET_CRYPTO_rsa_signature_free (sigs[i].rsa_signature);
- if (NULL != pubs[i].rsa_public_key)
- GNUNET_CRYPTO_rsa_public_key_free (pubs[i].rsa_public_key);
- }
- }
- return ret;
-}
-
-
-/**
- * Function called when we're done processing the
- * HTTP /refresh/link request.
- *
- * @param cls the `struct TALER_MINT_RefreshLinkHandle`
- * @param eh the curl request handle
- */
-static void
-handle_refresh_link_finished (void *cls,
- CURL *eh)
-{
- struct TALER_MINT_RefreshLinkHandle *rlh = cls;
- long response_code;
- json_t *json;
-
- rlh->job = NULL;
- json = MAC_download_get_result (&rlh->db,
- eh,
- &response_code);
- switch (response_code)
- {
- case 0:
- break;
- case MHD_HTTP_OK:
- if (GNUNET_OK !=
- parse_refresh_link_ok (rlh,
- json))
- {
- GNUNET_break_op (0);
- response_code = 0;
- }
- break;
- case MHD_HTTP_BAD_REQUEST:
- /* This should never happen, either us or the mint is buggy
- (or API version conflict); just pass JSON reply to the application */
- break;
- case MHD_HTTP_NOT_FOUND:
- /* Nothing really to verify, mint says this coin was not melted; we
- should pass the JSON reply to the application */
- break;
- case MHD_HTTP_INTERNAL_SERVER_ERROR:
- /* Server had an internal issue; we should retry, but this API
- leaves this to the application */
- break;
- default:
- /* unexpected response code */
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Unexpected response code %u\n",
- response_code);
- GNUNET_break (0);
- response_code = 0;
- break;
- }
- if (NULL != rlh->link_cb)
- rlh->link_cb (rlh->link_cb_cls,
- response_code,
- 0, NULL, NULL, NULL,
- json);
- json_decref (json);
- TALER_MINT_refresh_link_cancel (rlh);
-}
-
-
-/**
- * Submit a link request to the mint and get the mint's response.
- *
- * This API is typically not used by anyone, it is more a threat
- * against those trying to receive a funds transfer by abusing the
- * /refresh protocol.
- *
- * @param mint the mint handle; the mint must be ready to operate
- * @param coin_priv private key to request link data for
- * @param link_cb the callback to call with the useful result of the
- * refresh operation the @a coin_priv was involved in (if any)
- * @param link_cb_cls closure for @a link_cb
- * @return a handle for this request
- */
-struct TALER_MINT_RefreshLinkHandle *
-TALER_MINT_refresh_link (struct TALER_MINT_Handle *mint,
- const struct TALER_CoinSpendPrivateKeyP *coin_priv,
- TALER_MINT_RefreshLinkCallback link_cb,
- void *link_cb_cls)
-{
- struct TALER_MINT_RefreshLinkHandle *rlh;
- CURL *eh;
- struct TALER_MINT_Context *ctx;
- struct TALER_CoinSpendPublicKeyP coin_pub;
- char *pub_str;
- char *arg_str;
-
- if (GNUNET_YES !=
- MAH_handle_is_ready (mint))
- {
- GNUNET_break (0);
- return NULL;
- }
-
- GNUNET_CRYPTO_eddsa_key_get_public (&coin_priv->eddsa_priv,
- &coin_pub.eddsa_pub);
- pub_str = GNUNET_STRINGS_data_to_string_alloc (&coin_pub,
- sizeof (struct TALER_CoinSpendPublicKeyP));
- GNUNET_asprintf (&arg_str,
- "/refresh/link?coin_pub=%s",
- pub_str);
- GNUNET_free (pub_str);
-
- rlh = GNUNET_new (struct TALER_MINT_RefreshLinkHandle);
- rlh->mint = mint;
- rlh->link_cb = link_cb;
- rlh->link_cb_cls = link_cb_cls;
- rlh->coin_priv = *coin_priv;
- rlh->url = MAH_path_to_url (mint, arg_str);
- GNUNET_free (arg_str);
-
- eh = curl_easy_init ();
- GNUNET_assert (CURLE_OK ==
- curl_easy_setopt (eh,
- CURLOPT_URL,
- rlh->url));
- GNUNET_assert (CURLE_OK ==
- curl_easy_setopt (eh,
- CURLOPT_WRITEFUNCTION,
- &MAC_download_cb));
- GNUNET_assert (CURLE_OK ==
- curl_easy_setopt (eh,
- CURLOPT_WRITEDATA,
- &rlh->db));
- ctx = MAH_handle_to_context (mint);
- rlh->job = MAC_job_add (ctx,
- eh,
- GNUNET_YES,
- &handle_refresh_link_finished,
- rlh);
- return rlh;
-}
-
-
-/**
- * Cancel a refresh link request. This function cannot be used
- * on a request handle if the callback was already invoked.
- *
- * @param rlh the refresh link handle
- */
-void
-TALER_MINT_refresh_link_cancel (struct TALER_MINT_RefreshLinkHandle *rlh)
-{
- if (NULL != rlh->job)
- {
- MAC_job_cancel (rlh->job);
- rlh->job = NULL;
- }
- GNUNET_free_non_null (rlh->db.buf);
- GNUNET_free (rlh->url);
- GNUNET_free (rlh);
-}
-
-
-/* end of mint_api_refresh_link.c */