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_post-purses-PURSE_PUB-merge.c
19 : * @brief Implementation of the client to merge a purse
20 : * into an account
21 : * @author Christian Grothoff
22 : */
23 : #include <jansson.h>
24 : #include <microhttpd.h> /* just for HTTP status codes */
25 : #include <gnunet/gnunet_util_lib.h>
26 : #include <gnunet/gnunet_json_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler/taler_json_lib.h"
29 : #include "exchange_api_handle.h"
30 : #include "exchange_api_common.h"
31 : #include "taler/taler_signatures.h"
32 : #include "exchange_api_curl_defaults.h"
33 :
34 :
35 : /**
36 : * @brief A purse merge with deposit handle
37 : */
38 : struct TALER_EXCHANGE_PostPursesMergeHandle
39 : {
40 :
41 : /**
42 : * The curl context for this request.
43 : */
44 : struct GNUNET_CURL_Context *ctx;
45 :
46 : /**
47 : * The base URL of the exchange.
48 : */
49 : char *base_url;
50 :
51 : /**
52 : * The keys of the exchange this request handle will use
53 : */
54 : struct TALER_EXCHANGE_Keys *keys;
55 :
56 : /**
57 : * The url for this request, set during _start.
58 : */
59 : char *url;
60 :
61 : /**
62 : * Context for #TEH_curl_easy_post(). Keeps the data that must
63 : * persist for Curl to make the upload.
64 : */
65 : struct TALER_CURL_PostContext post_ctx;
66 :
67 : /**
68 : * Handle for the request.
69 : */
70 : struct GNUNET_CURL_Job *job;
71 :
72 : /**
73 : * Function to call with the result.
74 : */
75 : TALER_EXCHANGE_PostPursesMergeCallback cb;
76 :
77 : /**
78 : * Closure for @a cb.
79 : */
80 : TALER_EXCHANGE_POST_PURSES_MERGE_RESULT_CLOSURE *cb_cls;
81 :
82 : /**
83 : * Base URL of the provider hosting the @e reserve_pub.
84 : */
85 : char *provider_url;
86 :
87 : /**
88 : * Signature for our operation.
89 : */
90 : struct TALER_PurseMergeSignatureP merge_sig;
91 :
92 : /**
93 : * Expected value in the purse after fees.
94 : */
95 : struct TALER_Amount purse_value_after_fees;
96 :
97 : /**
98 : * Public key of the reserve public key.
99 : */
100 : struct TALER_ReservePublicKeyP reserve_pub;
101 :
102 : /**
103 : * Public key of the purse.
104 : */
105 : struct TALER_PurseContractPublicKeyP purse_pub;
106 :
107 : /**
108 : * Hash over the purse's contract terms.
109 : */
110 : struct TALER_PrivateContractHashP h_contract_terms;
111 :
112 : /**
113 : * When does the purse expire.
114 : */
115 : struct GNUNET_TIME_Timestamp purse_expiration;
116 :
117 : /**
118 : * Time of the merge.
119 : */
120 : struct GNUNET_TIME_Timestamp merge_timestamp;
121 :
122 : /**
123 : * Our merge key.
124 : */
125 : struct TALER_PurseMergePrivateKeyP merge_priv;
126 :
127 : /**
128 : * Reserve signature affirming the merge.
129 : */
130 : struct TALER_ReserveSignatureP reserve_sig;
131 :
132 : /**
133 : * The JSON body to post, built during _create and posted during _start.
134 : */
135 : json_t *body;
136 :
137 : };
138 :
139 :
140 : /**
141 : * Function called when we're done processing the
142 : * HTTP /purse/$PID/merge request.
143 : *
144 : * @param cls the `struct TALER_EXCHANGE_PostPursesMergeHandle`
145 : * @param response_code HTTP response code, 0 on error
146 : * @param response parsed JSON result, NULL on error
147 : */
148 : static void
149 6 : handle_purse_merge_finished (void *cls,
150 : long response_code,
151 : const void *response)
152 : {
153 6 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch = cls;
154 6 : const json_t *j = response;
155 6 : struct TALER_EXCHANGE_PostPursesMergeResponse dr = {
156 : .hr.reply = j,
157 6 : .hr.http_status = (unsigned int) response_code,
158 6 : .reserve_sig = &pch->reserve_sig
159 : };
160 :
161 6 : pch->job = NULL;
162 6 : switch (response_code)
163 : {
164 0 : case 0:
165 0 : dr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
166 0 : break;
167 3 : case MHD_HTTP_OK:
168 : {
169 : struct GNUNET_JSON_Specification spec[] = {
170 3 : GNUNET_JSON_spec_fixed_auto ("exchange_sig",
171 : &dr.details.ok.exchange_sig),
172 3 : GNUNET_JSON_spec_fixed_auto ("exchange_pub",
173 : &dr.details.ok.exchange_pub),
174 3 : GNUNET_JSON_spec_timestamp ("exchange_timestamp",
175 : &dr.details.ok.etime),
176 3 : TALER_JSON_spec_amount ("merge_amount",
177 3 : pch->purse_value_after_fees.currency,
178 : &dr.details.ok.merge_amount),
179 3 : GNUNET_JSON_spec_end ()
180 : };
181 :
182 3 : if (GNUNET_OK !=
183 3 : GNUNET_JSON_parse (j,
184 : spec,
185 : NULL, NULL))
186 : {
187 0 : GNUNET_break_op (0);
188 0 : dr.hr.http_status = 0;
189 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
190 0 : break;
191 : }
192 3 : if (GNUNET_OK !=
193 3 : TALER_EXCHANGE_test_signing_key (pch->keys,
194 : &dr.details.ok.exchange_pub))
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 3 : if (GNUNET_OK !=
202 3 : TALER_exchange_online_purse_merged_verify (
203 : dr.details.ok.etime,
204 : pch->purse_expiration,
205 3 : &pch->purse_value_after_fees,
206 3 : &pch->purse_pub,
207 3 : &pch->h_contract_terms,
208 3 : &pch->reserve_pub,
209 3 : pch->provider_url,
210 : &dr.details.ok.exchange_pub,
211 : &dr.details.ok.exchange_sig))
212 : {
213 0 : GNUNET_break_op (0);
214 0 : dr.hr.http_status = 0;
215 0 : dr.hr.ec = TALER_EC_EXCHANGE_PURSE_MERGE_EXCHANGE_SIGNATURE_INVALID;
216 0 : break;
217 : }
218 : }
219 3 : break;
220 0 : case MHD_HTTP_BAD_REQUEST:
221 : /* This should never happen, either us or the exchange is buggy
222 : (or API version conflict); just pass JSON reply to the application */
223 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
224 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
225 0 : break;
226 0 : case MHD_HTTP_PAYMENT_REQUIRED:
227 : /* purse was not (yet) full */
228 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
229 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
230 0 : break;
231 0 : case MHD_HTTP_FORBIDDEN:
232 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
233 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
234 : /* Nothing really to verify, exchange says one of the signatures is
235 : invalid; as we checked them, this should never happen, we
236 : should pass the JSON reply to the application */
237 0 : break;
238 0 : case MHD_HTTP_NOT_FOUND:
239 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
240 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
241 : /* Nothing really to verify, this should never
242 : happen, we should pass the JSON reply to the application */
243 0 : break;
244 2 : case MHD_HTTP_CONFLICT:
245 : {
246 : struct TALER_PurseMergePublicKeyP merge_pub;
247 :
248 2 : GNUNET_CRYPTO_eddsa_key_get_public (&pch->merge_priv.eddsa_priv,
249 : &merge_pub.eddsa_pub);
250 2 : if (GNUNET_OK !=
251 2 : TALER_EXCHANGE_check_purse_merge_conflict_ (
252 2 : &pch->merge_sig,
253 : &merge_pub,
254 2 : &pch->purse_pub,
255 2 : pch->provider_url,
256 : j))
257 : {
258 0 : GNUNET_break_op (0);
259 0 : dr.hr.http_status = 0;
260 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
261 0 : break;
262 : }
263 2 : break;
264 : }
265 : break;
266 0 : case MHD_HTTP_GONE:
267 : /* could happen if denomination was revoked */
268 : /* Note: one might want to check /keys for revocation
269 : signature here, alas tricky in case our /keys
270 : is outdated => left to clients */
271 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
272 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
273 0 : break;
274 1 : case MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS:
275 1 : dr.hr.ec = TALER_JSON_get_error_code (j);
276 1 : dr.hr.hint = TALER_JSON_get_error_hint (j);
277 1 : if (GNUNET_OK !=
278 1 : TALER_EXCHANGE_parse_451 (&dr.details.unavailable_for_legal_reasons,
279 : j))
280 : {
281 0 : GNUNET_break_op (0);
282 0 : dr.hr.http_status = 0;
283 0 : dr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
284 0 : break;
285 : }
286 1 : break;
287 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
288 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
289 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
290 : /* Server had an internal issue; we should retry, but this API
291 : leaves this to the application */
292 0 : break;
293 0 : default:
294 : /* unexpected response code */
295 0 : dr.hr.ec = TALER_JSON_get_error_code (j);
296 0 : dr.hr.hint = TALER_JSON_get_error_hint (j);
297 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
298 : "Unexpected response code %u/%d for exchange deposit\n",
299 : (unsigned int) response_code,
300 : dr.hr.ec);
301 0 : GNUNET_break_op (0);
302 0 : break;
303 : }
304 6 : if (NULL != pch->cb)
305 : {
306 6 : pch->cb (pch->cb_cls,
307 : &dr);
308 6 : pch->cb = NULL;
309 : }
310 6 : TALER_EXCHANGE_post_purses_merge_cancel (pch);
311 6 : }
312 :
313 :
314 : struct TALER_EXCHANGE_PostPursesMergeHandle *
315 6 : TALER_EXCHANGE_post_purses_merge_create (
316 : struct GNUNET_CURL_Context *ctx,
317 : const char *url,
318 : struct TALER_EXCHANGE_Keys *keys,
319 : const char *reserve_exchange_url,
320 : const struct TALER_ReservePrivateKeyP *reserve_priv,
321 : const struct TALER_PurseContractPublicKeyP *purse_pub,
322 : const struct TALER_PurseMergePrivateKeyP *merge_priv,
323 : const struct TALER_PrivateContractHashP *h_contract_terms,
324 : uint8_t min_age,
325 : const struct TALER_Amount *purse_value_after_fees,
326 : struct GNUNET_TIME_Timestamp purse_expiration,
327 : struct GNUNET_TIME_Timestamp merge_timestamp)
328 : {
329 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch;
330 :
331 6 : pch = GNUNET_new (struct TALER_EXCHANGE_PostPursesMergeHandle);
332 6 : pch->ctx = ctx;
333 6 : pch->base_url = GNUNET_strdup (url);
334 6 : pch->merge_priv = *merge_priv;
335 6 : pch->purse_pub = *purse_pub;
336 6 : pch->h_contract_terms = *h_contract_terms;
337 6 : pch->purse_expiration = purse_expiration;
338 6 : pch->purse_value_after_fees = *purse_value_after_fees;
339 6 : pch->merge_timestamp = merge_timestamp;
340 6 : if (NULL == reserve_exchange_url)
341 6 : pch->provider_url = GNUNET_strdup (url);
342 : else
343 0 : pch->provider_url = GNUNET_strdup (reserve_exchange_url);
344 6 : GNUNET_CRYPTO_eddsa_key_get_public (&reserve_priv->eddsa_priv,
345 : &pch->reserve_pub.eddsa_pub);
346 :
347 : {
348 : struct TALER_Amount zero_purse_fee;
349 :
350 6 : GNUNET_assert (GNUNET_OK ==
351 : TALER_amount_set_zero (purse_value_after_fees->currency,
352 : &zero_purse_fee));
353 6 : TALER_wallet_account_merge_sign (pch->merge_timestamp,
354 6 : &pch->purse_pub,
355 : purse_expiration,
356 : h_contract_terms,
357 : purse_value_after_fees,
358 : &zero_purse_fee,
359 : min_age,
360 : TALER_WAMF_MODE_MERGE_FULLY_PAID_PURSE,
361 : reserve_priv,
362 : &pch->reserve_sig);
363 : }
364 6 : pch->keys = TALER_EXCHANGE_keys_incref (keys);
365 6 : return pch;
366 : }
367 :
368 :
369 : enum TALER_ErrorCode
370 6 : TALER_EXCHANGE_post_purses_merge_start (
371 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch,
372 : TALER_EXCHANGE_PostPursesMergeCallback cb,
373 : TALER_EXCHANGE_POST_PURSES_MERGE_RESULT_CLOSURE *cb_cls)
374 : {
375 : char arg_str[sizeof (pch->purse_pub) * 2 + 32];
376 : CURL *eh;
377 :
378 6 : pch->cb = cb;
379 6 : pch->cb_cls = cb_cls;
380 :
381 : {
382 : char pub_str[sizeof (pch->purse_pub) * 2];
383 : char *end;
384 :
385 6 : end = GNUNET_STRINGS_data_to_string (
386 6 : &pch->purse_pub,
387 : sizeof (pch->purse_pub),
388 : pub_str,
389 : sizeof (pub_str));
390 6 : *end = '\0';
391 6 : GNUNET_snprintf (arg_str,
392 : sizeof (arg_str),
393 : "purses/%s/merge",
394 : pub_str);
395 : }
396 6 : pch->url = TALER_url_join (pch->base_url,
397 : arg_str,
398 : NULL);
399 6 : if (NULL == pch->url)
400 : {
401 0 : GNUNET_break (0);
402 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
403 : }
404 6 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
405 : "URL for purse merge: `%s'\n",
406 : pch->url);
407 : {
408 : struct TALER_NormalizedPayto reserve_url;
409 :
410 6 : reserve_url = TALER_reserve_make_payto (pch->provider_url,
411 6 : &pch->reserve_pub);
412 6 : if (NULL == reserve_url.normalized_payto)
413 : {
414 0 : GNUNET_break (0);
415 0 : return TALER_EC_GENERIC_ALLOCATION_FAILURE;
416 : }
417 6 : TALER_wallet_purse_merge_sign (reserve_url,
418 : pch->merge_timestamp,
419 6 : &pch->purse_pub,
420 6 : &pch->merge_priv,
421 : &pch->merge_sig);
422 6 : pch->body = GNUNET_JSON_PACK (
423 : TALER_JSON_pack_normalized_payto ("payto_uri",
424 : reserve_url),
425 : GNUNET_JSON_pack_data_auto ("merge_sig",
426 : &pch->merge_sig),
427 : GNUNET_JSON_pack_data_auto ("reserve_sig",
428 : &pch->reserve_sig),
429 : GNUNET_JSON_pack_timestamp ("merge_timestamp",
430 : pch->merge_timestamp));
431 6 : GNUNET_free (reserve_url.normalized_payto);
432 : }
433 :
434 6 : eh = TALER_EXCHANGE_curl_easy_get_ (pch->url);
435 12 : if ( (NULL == eh) ||
436 : (GNUNET_OK !=
437 6 : TALER_curl_easy_post (&pch->post_ctx,
438 : eh,
439 6 : pch->body)) )
440 : {
441 0 : GNUNET_break (0);
442 0 : if (NULL != eh)
443 0 : curl_easy_cleanup (eh);
444 0 : return TALER_EC_GENERIC_CURL_ALLOCATION_FAILURE;
445 : }
446 12 : pch->job = GNUNET_CURL_job_add2 (pch->ctx,
447 : eh,
448 6 : pch->post_ctx.headers,
449 : &handle_purse_merge_finished,
450 : pch);
451 6 : if (NULL == pch->job)
452 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
453 6 : return TALER_EC_NONE;
454 : }
455 :
456 :
457 : void
458 6 : TALER_EXCHANGE_post_purses_merge_cancel (
459 : struct TALER_EXCHANGE_PostPursesMergeHandle *pch)
460 : {
461 6 : if (NULL != pch->job)
462 : {
463 0 : GNUNET_CURL_job_cancel (pch->job);
464 0 : pch->job = NULL;
465 : }
466 6 : GNUNET_free (pch->url);
467 6 : GNUNET_free (pch->base_url);
468 6 : GNUNET_free (pch->provider_url);
469 6 : TALER_curl_easy_post_finished (&pch->post_ctx);
470 6 : TALER_EXCHANGE_keys_decref (pch->keys);
471 6 : json_decref (pch->body);
472 6 : GNUNET_free (pch);
473 6 : }
474 :
475 :
476 : /* end of exchange_api_post-purses-PURSE_PUB-merge.c */
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