Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2022-2023 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_purse_merge.c
19 : * @brief Implementation of the client to merge a purse
20 : * into an account
21 : * @author Christian Grothoff
22 : */
23 : #include "platform.h"
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_json_lib.h>
28 : #include <gnunet/gnunet_curl_lib.h>
29 : #include "taler_json_lib.h"
30 : #include "taler_exchange_service.h"
31 : #include "exchange_api_handle.h"
32 : #include "exchange_api_common.h"
33 : #include "taler_signatures.h"
34 : #include "exchange_api_curl_defaults.h"
35 :
36 :
37 : /**
38 : * @brief A purse merge with deposit handle
39 : */
40 : struct TALER_EXCHANGE_AccountMergeHandle
41 : {
42 :
43 : /**
44 : * The keys of the exchange this request handle will use
45 : */
46 : struct TALER_EXCHANGE_Keys *keys;
47 :
48 : /**
49 : * The url for this request.
50 : */
51 : char *url;
52 :
53 : /**
54 : * Context for #TEH_curl_easy_post(). Keeps the data that must
55 : * persist for Curl to make the upload.
56 : */
57 : struct TALER_CURL_PostContext ctx;
58 :
59 : /**
60 : * Handle for the request.
61 : */
62 : struct GNUNET_CURL_Job *job;
63 :
64 : /**
65 : * Function to call with the result.
66 : */
67 : TALER_EXCHANGE_AccountMergeCallback cb;
68 :
69 : /**
70 : * Closure for @a cb.
71 : */
72 : void *cb_cls;
73 :
74 : /**
75 : * Base URL of the provider hosting the @e reserve_pub.
76 : */
77 : char *provider_url;
78 :
79 : /**
80 : * Signature for our operation.
81 : */
82 : struct TALER_PurseMergeSignatureP merge_sig;
83 :
84 : /**
85 : * Expected value in the purse after fees.
86 : */
87 : struct TALER_Amount purse_value_after_fees;
88 :
89 : /**
90 : * Public key of the reserve public key.
91 : */
92 : struct TALER_ReservePublicKeyP reserve_pub;
93 :
94 : /**
95 : * Public key of the purse.
96 : */
97 : struct TALER_PurseContractPublicKeyP purse_pub;
98 :
99 : /**
100 : * Hash over the purse's contrac terms.
101 : */
102 : struct TALER_PrivateContractHashP h_contract_terms;
103 :
104 : /**
105 : * When does the purse expire.
106 : */
107 : struct GNUNET_TIME_Timestamp purse_expiration;
108 :
109 : /**
110 : * Our merge key.
111 : */
112 : struct TALER_PurseMergePrivateKeyP merge_priv;
113 :
114 : /**
115 : * Reserve signature affirming the merge.
116 : */
117 : struct TALER_ReserveSignatureP reserve_sig;
118 :
119 : };
120 :
121 :
122 : /**
123 : * Function called when we're done processing the
124 : * HTTP /purse/$PID/merge request.
125 : *
126 : * @param cls the `struct TALER_EXCHANGE_AccountMergeHandle`
127 : * @param response_code HTTP response code, 0 on error
128 : * @param response parsed JSON result, NULL on error
129 : */
130 : static void
131 6 : handle_purse_merge_finished (void *cls,
132 : long response_code,
133 : const void *response)
134 : {
135 6 : struct TALER_EXCHANGE_AccountMergeHandle *pch = cls;
136 6 : const json_t *j = response;
137 6 : struct TALER_EXCHANGE_AccountMergeResponse dr = {
138 : .hr.reply = j,
139 6 : .hr.http_status = (unsigned int) response_code,
140 6 : .reserve_sig = &pch->reserve_sig
141 : };
142 :
143 6 : pch->job = NULL;
144 6 : switch (response_code)
145 : {
146 0 : case 0:
147 0 : dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
148 0 : break;
149 3 : case MHD_HTTP_OK:
150 : {
151 : struct TALER_Amount total_deposited;
152 : struct GNUNET_JSON_Specification spec[] = {
153 3 : GNUNET_JSON_spec_fixed_auto ("exchange_sig",
154 : &dr.details.ok.exchange_sig),
155 3 : GNUNET_JSON_spec_fixed_auto ("exchange_pub",
156 : &dr.details.ok.exchange_pub),
157 3 : GNUNET_JSON_spec_timestamp ("exchange_timestamp",
158 : &dr.details.ok.etime),
159 3 : TALER_JSON_spec_amount ("merge_amount",
160 3 : pch->purse_value_after_fees.currency,
161 : &total_deposited),
162 3 : GNUNET_JSON_spec_end ()
163 : };
164 :
165 3 : if (GNUNET_OK !=
166 3 : GNUNET_JSON_parse (j,
167 : spec,
168 : NULL, NULL))
169 : {
170 0 : GNUNET_break_op (0);
171 0 : dr.hr.http_status = 0;
172 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
173 0 : break;
174 : }
175 3 : if (GNUNET_OK !=
176 3 : TALER_EXCHANGE_test_signing_key (pch->keys,
177 : &dr.details.ok.exchange_pub))
178 : {
179 0 : GNUNET_break_op (0);
180 0 : dr.hr.http_status = 0;
181 0 : dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
182 0 : break;
183 : }
184 3 : if (GNUNET_OK !=
185 3 : TALER_exchange_online_purse_merged_verify (
186 : dr.details.ok.etime,
187 : pch->purse_expiration,
188 3 : &pch->purse_value_after_fees,
189 3 : &pch->purse_pub,
190 3 : &pch->h_contract_terms,
191 3 : &pch->reserve_pub,
192 3 : pch->provider_url,
193 : &dr.details.ok.exchange_pub,
194 : &dr.details.ok.exchange_sig))
195 : {
196 0 : GNUNET_break_op (0);
197 0 : dr.hr.http_status = 0;
198 0 : dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
199 0 : break;
200 : }
201 : }
202 3 : break;
203 0 : case MHD_HTTP_BAD_REQUEST:
204 : /* This should never happen, either us or the exchange is buggy
205 : (or API version conflict); just pass JSON reply to the application */
206 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
207 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
208 0 : break;
209 0 : case MHD_HTTP_PAYMENT_REQUIRED:
210 : /* purse was not (yet) full */
211 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
212 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
213 0 : break;
214 0 : case MHD_HTTP_FORBIDDEN:
215 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
216 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
217 : /* Nothing really to verify, exchange says one of the signatures is
218 : invalid; as we checked them, this should never happen, we
219 : should pass the JSON reply to the application */
220 0 : break;
221 0 : case MHD_HTTP_NOT_FOUND:
222 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
223 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
224 : /* Nothing really to verify, this should never
225 : happen, we should pass the JSON reply to the application */
226 0 : break;
227 2 : case MHD_HTTP_CONFLICT:
228 : {
229 : struct TALER_PurseMergePublicKeyP merge_pub;
230 :
231 2 : GNUNET_CRYPTO_eddsa_key_get_public (&pch->merge_priv.eddsa_priv,
232 : &merge_pub.eddsa_pub);
233 2 : if (GNUNET_OK !=
234 2 : TALER_EXCHANGE_check_purse_merge_conflict_ (
235 2 : &pch->merge_sig,
236 : &merge_pub,
237 2 : &pch->purse_pub,
238 2 : pch->provider_url,
239 : j))
240 : {
241 0 : GNUNET_break_op (0);
242 0 : dr.hr.http_status = 0;
243 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
244 0 : break;
245 : }
246 2 : break;
247 : }
248 : break;
249 0 : case MHD_HTTP_GONE:
250 : /* could happen if denomination was revoked */
251 : /* Note: one might want to check /keys for revocation
252 : signature here, alas tricky in case our /keys
253 : is outdated => left to clients */
254 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
255 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
256 0 : break;
257 1 : case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
258 : {
259 : struct GNUNET_JSON_Specification spec[] = {
260 1 : GNUNET_JSON_spec_uint64 (
261 : "requirement_row",
262 : &dr.details.unavailable_for_legal_reasons.requirement_row),
263 1 : GNUNET_JSON_spec_end ()
264 : };
265 :
266 1 : if (GNUNET_OK !=
267 1 : GNUNET_JSON_parse (j,
268 : spec,
269 : NULL, NULL))
270 : {
271 0 : GNUNET_break_op (0);
272 0 : dr.hr.http_status = 0;
273 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
274 0 : break;
275 : }
276 : }
277 1 : break;
278 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
279 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
280 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
281 : /* Server had an internal issue; we should retry, but this API
282 : leaves this to the application */
283 0 : break;
284 0 : default:
285 : /* unexpected response code */
286 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
287 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
288 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
289 : "Unexpected response code %u/%d for exchange deposit\n",
290 : (unsigned int) response_code,
291 : dr.hr.ec);
292 0 : GNUNET_break_op (0);
293 0 : break;
294 : }
295 6 : pch->cb (pch->cb_cls,
296 : &dr);
297 6 : TALER_EXCHANGE_account_merge_cancel (pch);
298 6 : }
299 :
300 :
301 : struct TALER_EXCHANGE_AccountMergeHandle *
302 6 : TALER_EXCHANGE_account_merge (
303 : struct GNUNET_CURL_Context *ctx,
304 : const char *url,
305 : struct TALER_EXCHANGE_Keys *keys,
306 : const char *reserve_exchange_url,
307 : const struct TALER_ReservePrivateKeyP *reserve_priv,
308 : const struct TALER_PurseContractPublicKeyP *purse_pub,
309 : const struct TALER_PurseMergePrivateKeyP *merge_priv,
310 : const struct TALER_PrivateContractHashP *h_contract_terms,
311 : uint8_t min_age,
312 : const struct TALER_Amount *purse_value_after_fees,
313 : struct GNUNET_TIME_Timestamp purse_expiration,
314 : struct GNUNET_TIME_Timestamp merge_timestamp,
315 : TALER_EXCHANGE_AccountMergeCallback cb,
316 : void *cb_cls)
317 : {
318 : struct TALER_EXCHANGE_AccountMergeHandle *pch;
319 : json_t *merge_obj;
320 : CURL *eh;
321 : char arg_str[sizeof (pch->purse_pub) * 2 + 32];
322 : struct TALER_NormalizedPayto reserve_url;
323 :
324 6 : pch = GNUNET_new (struct TALER_EXCHANGE_AccountMergeHandle);
325 6 : pch->merge_priv = *merge_priv;
326 6 : pch->cb = cb;
327 6 : pch->cb_cls = cb_cls;
328 6 : pch->purse_pub = *purse_pub;
329 6 : pch->h_contract_terms = *h_contract_terms;
330 6 : pch->purse_expiration = purse_expiration;
331 6 : pch->purse_value_after_fees = *purse_value_after_fees;
332 6 : if (NULL == reserve_exchange_url)
333 6 : pch->provider_url = GNUNET_strdup (url);
334 : else
335 0 : pch->provider_url = GNUNET_strdup (reserve_exchange_url);
336 6 : GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
337 : &pch->reserve_pub.eddsa_pub);
338 :
339 : {
340 : char pub_str[sizeof (*purse_pub) * 2];
341 : char *end;
342 :
343 6 : end = GNUNET_STRINGS_data_to_string (
344 : purse_pub,
345 : sizeof (*purse_pub),
346 : pub_str,
347 : sizeof (pub_str));
348 6 : *end = '\0';
349 6 : GNUNET_snprintf (arg_str,
350 : sizeof (arg_str),
351 : "purses/%s/merge",
352 : pub_str);
353 : }
354 6 : reserve_url = TALER_reserve_make_payto (pch->provider_url,
355 6 : &pch->reserve_pub);
356 6 : if (NULL == reserve_url.normalized_payto)
357 : {
358 0 : GNUNET_break (0);
359 0 : GNUNET_free (pch->provider_url);
360 0 : GNUNET_free (pch);
361 0 : return NULL;
362 : }
363 6 : pch->url = TALER_url_join (url,
364 : arg_str,
365 : NULL);
366 6 : if (NULL == pch->url)
367 : {
368 0 : GNUNET_break (0);
369 0 : GNUNET_free (reserve_url.normalized_payto);
370 0 : GNUNET_free (pch->provider_url);
371 0 : GNUNET_free (pch);
372 0 : return NULL;
373 : }
374 6 : TALER_wallet_purse_merge_sign (reserve_url,
375 : merge_timestamp,
376 : purse_pub,
377 : merge_priv,
378 : &pch->merge_sig);
379 : {
380 : struct TALER_Amount zero_purse_fee;
381 :
382 6 : GNUNET_assert (GNUNET_OK ==
383 : TALER_amount_set_zero (purse_value_after_fees->currency,
384 : &zero_purse_fee));
385 6 : TALER_wallet_account_merge_sign (merge_timestamp,
386 : purse_pub,
387 : purse_expiration,
388 : h_contract_terms,
389 : purse_value_after_fees,
390 : &zero_purse_fee,
391 : min_age,
392 : TALER_WAMF_MODE_MERGE_FULLY_PAID_PURSE,
393 : reserve_priv,
394 : &pch->reserve_sig);
395 : }
396 6 : merge_obj = GNUNET_JSON_PACK (
397 : TALER_JSON_pack_normalized_payto ("payto_uri",
398 : reserve_url),
399 : GNUNET_JSON_pack_data_auto ("merge_sig",
400 : &pch->merge_sig),
401 : GNUNET_JSON_pack_data_auto ("reserve_sig",
402 : &pch->reserve_sig),
403 : GNUNET_JSON_pack_timestamp ("merge_timestamp",
404 : merge_timestamp));
405 6 : GNUNET_assert (NULL != merge_obj);
406 6 : GNUNET_free (reserve_url.normalized_payto);
407 6 : eh = TALER_EXCHANGE_curl_easy_get_ (pch->url);
408 12 : if ( (NULL == eh) ||
409 : (GNUNET_OK !=
410 6 : TALER_curl_easy_post (&pch->ctx,
411 : eh,
412 : merge_obj)) )
413 : {
414 0 : GNUNET_break (0);
415 0 : if (NULL != eh)
416 0 : curl_easy_cleanup (eh);
417 0 : json_decref (merge_obj);
418 0 : GNUNET_free (pch->provider_url);
419 0 : GNUNET_free (pch->url);
420 0 : GNUNET_free (pch);
421 0 : return NULL;
422 : }
423 6 : json_decref (merge_obj);
424 6 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
425 : "URL for purse merge: `%s'\n",
426 : pch->url);
427 6 : pch->keys = TALER_EXCHANGE_keys_incref (keys);
428 12 : pch->job = GNUNET_CURL_job_add2 (ctx,
429 : eh,
430 6 : pch->ctx.headers,
431 : &handle_purse_merge_finished,
432 : pch);
433 6 : return pch;
434 : }
435 :
436 :
437 : void
438 6 : TALER_EXCHANGE_account_merge_cancel (
439 : struct TALER_EXCHANGE_AccountMergeHandle *pch)
440 : {
441 6 : if (NULL != pch->job)
442 : {
443 0 : GNUNET_CURL_job_cancel (pch->job);
444 0 : pch->job = NULL;
445 : }
446 6 : GNUNET_free (pch->url);
447 6 : GNUNET_free (pch->provider_url);
448 6 : TALER_curl_easy_post_finished (&pch->ctx);
449 6 : TALER_EXCHANGE_keys_decref (pch->keys);
450 6 : GNUNET_free (pch);
451 6 : }
452 :
453 :
454 : /* end of exchange_api_purse_merge.c */
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