Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2017-2026 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU General Public License as published by the Free Software
7 : Foundation; either version 3, or (at your option) any later version.
8 :
9 : TALER is distributed in the hope that it will be useful, but WITHOUT ANY
10 : WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11 : A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12 :
13 : You should have received a copy of the GNU General Public License along with
14 : TALER; see the file COPYING. If not, see
15 : <http://www.gnu.org/licenses/>
16 : */
17 : /**
18 : * @file lib/exchange_api_post-recoup-refresh.c
19 : * @brief Implementation of the /recoup-refresh request of the exchange's HTTP API
20 : * @author Christian Grothoff
21 : */
22 : #include <jansson.h>
23 : #include <microhttpd.h> /* just for HTTP status codes */
24 : #include <gnunet/gnunet_util_lib.h>
25 : #include <gnunet/gnunet_json_lib.h>
26 : #include <gnunet/gnunet_curl_lib.h>
27 : #include "taler/taler_json_lib.h"
28 : #include "exchange_api_common.h"
29 : #include "exchange_api_handle.h"
30 : #include "taler/taler_signatures.h"
31 : #include "exchange_api_curl_defaults.h"
32 :
33 :
34 : /**
35 : * @brief A Recoup-Refresh Handle
36 : */
37 : struct TALER_EXCHANGE_PostRecoupRefreshHandle
38 : {
39 :
40 : /**
41 : * The base URL for this request.
42 : */
43 : char *base_url;
44 :
45 : /**
46 : * The full URL for this request, set during _start.
47 : */
48 : char *url;
49 :
50 : /**
51 : * Minor context that holds body and headers.
52 : */
53 : struct TALER_CURL_PostContext post_ctx;
54 :
55 : /**
56 : * Handle for the request.
57 : */
58 : struct GNUNET_CURL_Job *job;
59 :
60 : /**
61 : * Function to call with the result.
62 : */
63 : TALER_EXCHANGE_PostRecoupRefreshCallback cb;
64 :
65 : /**
66 : * Closure for @a cb.
67 : */
68 : TALER_EXCHANGE_POST_RECOUP_REFRESH_RESULT_CLOSURE *cb_cls;
69 :
70 : /**
71 : * Reference to the execution context.
72 : */
73 : struct GNUNET_CURL_Context *ctx;
74 :
75 : /**
76 : * The keys of the exchange this request handle will use.
77 : */
78 : struct TALER_EXCHANGE_Keys *keys;
79 :
80 : /**
81 : * Public key of the coin we are trying to get paid back.
82 : */
83 : struct TALER_CoinSpendPublicKeyP coin_pub;
84 :
85 : /**
86 : * Pre-built request body.
87 : */
88 : json_t *body;
89 :
90 : };
91 :
92 :
93 : /**
94 : * Parse a recoup-refresh response. If it is valid, call the callback.
95 : *
96 : * @param ph recoup-refresh handle
97 : * @param json json reply with the signature
98 : * @return #GNUNET_OK if the signature is valid and we called the callback;
99 : * #GNUNET_SYSERR if not (callback must still be called)
100 : */
101 : static enum GNUNET_GenericReturnValue
102 0 : process_recoup_response (
103 : const struct TALER_EXCHANGE_PostRecoupRefreshHandle *ph,
104 : const json_t *json)
105 : {
106 0 : struct TALER_EXCHANGE_PostRecoupRefreshResponse rrr = {
107 : .hr.reply = json,
108 : .hr.http_status = MHD_HTTP_OK
109 : };
110 : struct GNUNET_JSON_Specification spec_refresh[] = {
111 0 : GNUNET_JSON_spec_fixed_auto ("old_coin_pub",
112 : &rrr.details.ok.old_coin_pub),
113 0 : GNUNET_JSON_spec_end ()
114 : };
115 :
116 0 : if (GNUNET_OK !=
117 0 : GNUNET_JSON_parse (json,
118 : spec_refresh,
119 : NULL, NULL))
120 : {
121 0 : GNUNET_break_op (0);
122 0 : return GNUNET_SYSERR;
123 : }
124 0 : ph->cb (ph->cb_cls,
125 : &rrr);
126 0 : return GNUNET_OK;
127 : }
128 :
129 :
130 : /**
131 : * Function called when we're done processing the
132 : * HTTP /recoup-refresh request.
133 : *
134 : * @param cls the `struct TALER_EXCHANGE_PostRecoupRefreshHandle`
135 : * @param response_code HTTP response code, 0 on error
136 : * @param response parsed JSON result, NULL on error
137 : */
138 : static void
139 0 : handle_recoup_refresh_finished (void *cls,
140 : long response_code,
141 : const void *response)
142 : {
143 0 : struct TALER_EXCHANGE_PostRecoupRefreshHandle *ph = cls;
144 0 : const json_t *j = response;
145 0 : struct TALER_EXCHANGE_PostRecoupRefreshResponse rrr = {
146 : .hr.reply = j,
147 0 : .hr.http_status = (unsigned int) response_code
148 : };
149 :
150 0 : ph->job = NULL;
151 0 : switch (response_code)
152 : {
153 0 : case 0:
154 0 : rrr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
155 0 : break;
156 0 : case MHD_HTTP_OK:
157 0 : if (GNUNET_OK !=
158 0 : process_recoup_response (ph,
159 : j))
160 : {
161 0 : GNUNET_break_op (0);
162 0 : rrr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
163 0 : rrr.hr.http_status = 0;
164 0 : break;
165 : }
166 0 : TALER_EXCHANGE_post_recoup_refresh_cancel (ph);
167 0 : return;
168 0 : case MHD_HTTP_BAD_REQUEST:
169 : /* This should never happen, either us or the exchange is buggy
170 : (or API version conflict); just pass JSON reply to the application */
171 0 : rrr.hr.ec = TALER_JSON_get_error_code (j);
172 0 : rrr.hr.hint = TALER_JSON_get_error_hint (j);
173 0 : break;
174 0 : case MHD_HTTP_FORBIDDEN:
175 : /* Nothing really to verify, exchange says one of the signatures is
176 : invalid; as we checked them, this should never happen, we
177 : should pass the JSON reply to the application */
178 0 : rrr.hr.ec = TALER_JSON_get_error_code (j);
179 0 : rrr.hr.hint = TALER_JSON_get_error_hint (j);
180 0 : break;
181 0 : case MHD_HTTP_NOT_FOUND:
182 : /* Nothing really to verify, this should never
183 : happen, we should pass the JSON reply to the application */
184 0 : rrr.hr.ec = TALER_JSON_get_error_code (j);
185 0 : rrr.hr.hint = TALER_JSON_get_error_hint (j);
186 0 : break;
187 0 : case MHD_HTTP_CONFLICT:
188 0 : rrr.hr.ec = TALER_JSON_get_error_code (j);
189 0 : rrr.hr.hint = TALER_JSON_get_error_hint (j);
190 0 : break;
191 0 : case MHD_HTTP_GONE:
192 : /* Kind of normal: the money was already sent to the merchant
193 : (it was too late for the refund). */
194 0 : rrr.hr.ec = TALER_JSON_get_error_code (j);
195 0 : rrr.hr.hint = TALER_JSON_get_error_hint (j);
196 0 : break;
197 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
198 : /* Server had an internal issue; we should retry, but this API
199 : leaves this to the application */
200 0 : rrr.hr.ec = TALER_JSON_get_error_code (j);
201 0 : rrr.hr.hint = TALER_JSON_get_error_hint (j);
202 0 : break;
203 0 : default:
204 : /* unexpected response code */
205 0 : rrr.hr.ec = TALER_JSON_get_error_code (j);
206 0 : rrr.hr.hint = TALER_JSON_get_error_hint (j);
207 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
208 : "Unexpected response code %u/%d for exchange recoup-refresh\n",
209 : (unsigned int) response_code,
210 : (int) rrr.hr.ec);
211 0 : GNUNET_break (0);
212 0 : break;
213 : }
214 0 : ph->cb (ph->cb_cls,
215 : &rrr);
216 0 : TALER_EXCHANGE_post_recoup_refresh_cancel (ph);
217 : }
218 :
219 :
220 : struct TALER_EXCHANGE_PostRecoupRefreshHandle *
221 0 : TALER_EXCHANGE_post_recoup_refresh_create (
222 : struct GNUNET_CURL_Context *ctx,
223 : const char *url,
224 : struct TALER_EXCHANGE_Keys *keys,
225 : const struct TALER_EXCHANGE_DenomPublicKey *pk,
226 : const struct TALER_DenominationSignature *denom_sig,
227 : const struct TALER_ExchangeBlindingValues *exchange_vals,
228 : const struct TALER_PublicRefreshMasterSeedP *rms,
229 : const struct TALER_PlanchetMasterSecretP *ps,
230 : unsigned int idx)
231 : {
232 : struct TALER_EXCHANGE_PostRecoupRefreshHandle *ph;
233 : struct TALER_DenominationHashP h_denom_pub;
234 : struct TALER_CoinSpendPrivateKeyP coin_priv;
235 : union GNUNET_CRYPTO_BlindingSecretP bks;
236 : struct TALER_CoinSpendSignatureP coin_sig;
237 :
238 : (void) rms; // FIXME: why did we pass this again?
239 : (void) idx; // FIXME: why did we pass this again?
240 0 : ph = GNUNET_new (struct TALER_EXCHANGE_PostRecoupRefreshHandle);
241 0 : ph->ctx = ctx;
242 0 : ph->base_url = GNUNET_strdup (url);
243 0 : ph->keys = TALER_EXCHANGE_keys_incref (keys);
244 0 : TALER_planchet_setup_coin_priv (ps,
245 : exchange_vals,
246 : &coin_priv);
247 0 : TALER_planchet_blinding_secret_create (ps,
248 : exchange_vals,
249 : &bks);
250 0 : GNUNET_CRYPTO_eddsa_key_get_public (&coin_priv.eddsa_priv,
251 : &ph->coin_pub.eddsa_pub);
252 0 : TALER_denom_pub_hash (&pk->key,
253 : &h_denom_pub);
254 0 : TALER_wallet_recoup_refresh_sign (&h_denom_pub,
255 : &bks,
256 : &coin_priv,
257 : &coin_sig);
258 0 : ph->body = GNUNET_JSON_PACK (
259 : GNUNET_JSON_pack_data_auto ("denom_pub_hash",
260 : &h_denom_pub),
261 : TALER_JSON_pack_denom_sig ("denom_sig",
262 : denom_sig),
263 : TALER_JSON_pack_exchange_blinding_values ("ewv",
264 : exchange_vals),
265 : GNUNET_JSON_pack_data_auto ("coin_sig",
266 : &coin_sig),
267 : GNUNET_JSON_pack_data_auto ("coin_blind_key_secret",
268 : &bks));
269 : // FIXME: nonce and h_age_commitment never sent here, but required
270 : // by spec and server (if used with age commentment or CS cipher!)
271 0 : switch (denom_sig->unblinded_sig->cipher)
272 : {
273 0 : case GNUNET_CRYPTO_BSA_INVALID:
274 0 : json_decref (ph->body);
275 0 : GNUNET_free (ph->base_url);
276 0 : TALER_EXCHANGE_keys_decref (ph->keys);
277 0 : GNUNET_free (ph);
278 0 : GNUNET_break (0);
279 0 : return NULL;
280 0 : case GNUNET_CRYPTO_BSA_RSA:
281 0 : break;
282 0 : case GNUNET_CRYPTO_BSA_CS:
283 0 : break;
284 : }
285 0 : return ph;
286 : }
287 :
288 :
289 : enum TALER_ErrorCode
290 0 : TALER_EXCHANGE_post_recoup_refresh_start (
291 : struct TALER_EXCHANGE_PostRecoupRefreshHandle *ph,
292 : TALER_EXCHANGE_PostRecoupRefreshCallback cb,
293 : TALER_EXCHANGE_POST_RECOUP_REFRESH_RESULT_CLOSURE *cb_cls)
294 : {
295 : CURL *eh;
296 : char arg_str[sizeof (struct TALER_CoinSpendPublicKeyP) * 2 + 32];
297 :
298 0 : ph->cb = cb;
299 0 : ph->cb_cls = cb_cls;
300 : {
301 : char pub_str[sizeof (struct TALER_CoinSpendPublicKeyP) * 2];
302 : char *end;
303 :
304 0 : end = GNUNET_STRINGS_data_to_string (
305 0 : &ph->coin_pub,
306 : sizeof (struct TALER_CoinSpendPublicKeyP),
307 : pub_str,
308 : sizeof (pub_str));
309 0 : *end = '\0';
310 0 : GNUNET_snprintf (arg_str,
311 : sizeof (arg_str),
312 : "coins/%s/recoup-refresh",
313 : pub_str);
314 : }
315 0 : ph->url = TALER_url_join (ph->base_url,
316 : arg_str,
317 : NULL);
318 0 : if (NULL == ph->url)
319 : {
320 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
321 : "Could not construct request URL.\n");
322 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
323 : }
324 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
325 : "URL for recoup-refresh: `%s'\n",
326 : ph->url);
327 0 : eh = TALER_EXCHANGE_curl_easy_get_ (ph->url);
328 0 : if ( (NULL == eh) ||
329 : (GNUNET_OK !=
330 0 : TALER_curl_easy_post (&ph->post_ctx,
331 : eh,
332 0 : ph->body)) )
333 : {
334 0 : GNUNET_break (0);
335 0 : if (NULL != eh)
336 0 : curl_easy_cleanup (eh);
337 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
338 : }
339 0 : ph->job = GNUNET_CURL_job_add2 (ph->ctx,
340 : eh,
341 0 : ph->post_ctx.headers,
342 : &handle_recoup_refresh_finished,
343 : ph);
344 0 : if (NULL == ph->job)
345 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
346 0 : return TALER_EC_NONE;
347 : }
348 :
349 :
350 : void
351 0 : TALER_EXCHANGE_post_recoup_refresh_cancel (
352 : struct TALER_EXCHANGE_PostRecoupRefreshHandle *ph)
353 : {
354 0 : if (NULL != ph->job)
355 : {
356 0 : GNUNET_CURL_job_cancel (ph->job);
357 0 : ph->job = NULL;
358 : }
359 0 : TALER_curl_easy_post_finished (&ph->post_ctx);
360 0 : GNUNET_free (ph->url);
361 0 : GNUNET_free (ph->base_url);
362 0 : json_decref (ph->body);
363 0 : TALER_EXCHANGE_keys_decref (ph->keys);
364 0 : GNUNET_free (ph);
365 0 : }
366 :
367 :
368 : /* end of exchange_api_post-recoup-refresh.c */
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