Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2015-2026 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-management-keys.c
19 : * @brief functions to affirm the validity of exchange keys using the master private key
20 : * @author Christian Grothoff
21 : */
22 : #include "taler/taler_json_lib.h"
23 : #include <gnunet/gnunet_curl_lib.h>
24 : #include <microhttpd.h>
25 : #include "taler/exchange/post-management-keys.h"
26 : #include "exchange_api_curl_defaults.h"
27 : #include "taler/taler_curl_lib.h"
28 :
29 :
30 : /**
31 : * @brief Handle for a POST /management/keys request.
32 : */
33 : struct TALER_EXCHANGE_PostManagementKeysHandle
34 : {
35 :
36 : /**
37 : * The base URL for this request.
38 : */
39 : char *base_url;
40 :
41 : /**
42 : * The full URL for this request, set during _start.
43 : */
44 : char *url;
45 :
46 : /**
47 : * Minor context that holds body and headers.
48 : */
49 : struct TALER_CURL_PostContext post_ctx;
50 :
51 : /**
52 : * Handle for the request.
53 : */
54 : struct GNUNET_CURL_Job *job;
55 :
56 : /**
57 : * Function to call with the result.
58 : */
59 : TALER_EXCHANGE_PostManagementKeysCallback cb;
60 :
61 : /**
62 : * Closure for @a cb.
63 : */
64 : TALER_EXCHANGE_POST_MANAGEMENT_KEYS_RESULT_CLOSURE *cb_cls;
65 :
66 : /**
67 : * Reference to the execution context.
68 : */
69 : struct GNUNET_CURL_Context *ctx;
70 :
71 : /**
72 : * Array of master signatures for the exchange's online signing keys.
73 : */
74 : struct TALER_EXCHANGE_SigningKeySignature *sign_sigs;
75 :
76 : /**
77 : * Length of the @e sign_sigs array.
78 : */
79 : unsigned int num_sign_sigs;
80 :
81 : /**
82 : * Array of master signatures for the exchange's denomination keys.
83 : */
84 : struct TALER_EXCHANGE_DenominationKeySignature *denom_sigs;
85 :
86 : /**
87 : * Length of the @e denom_sigs array.
88 : */
89 : unsigned int num_denom_sigs;
90 :
91 : };
92 :
93 :
94 : /**
95 : * Function called when we're done processing the
96 : * HTTP POST /management/keys request.
97 : *
98 : * @param cls the `struct TALER_EXCHANGE_PostManagementKeysHandle`
99 : * @param response_code HTTP response code, 0 on error
100 : * @param response response body, NULL if not in JSON
101 : */
102 : static void
103 19 : handle_post_keys_finished (void *cls,
104 : long response_code,
105 : const void *response)
106 : {
107 19 : struct TALER_EXCHANGE_PostManagementKeysHandle *pmkh = cls;
108 19 : const json_t *json = response;
109 19 : struct TALER_EXCHANGE_PostManagementKeysResponse res = {
110 19 : .hr.http_status = (unsigned int) response_code,
111 : .hr.reply = json
112 : };
113 :
114 19 : pmkh->job = NULL;
115 19 : switch (response_code)
116 : {
117 19 : case MHD_HTTP_NO_CONTENT:
118 19 : break;
119 0 : case MHD_HTTP_FORBIDDEN:
120 0 : res.hr.ec = TALER_JSON_get_error_code (json);
121 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
122 0 : break;
123 0 : case MHD_HTTP_NOT_FOUND:
124 0 : res.hr.ec = TALER_JSON_get_error_code (json);
125 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
126 0 : break;
127 0 : case MHD_HTTP_CONFLICT:
128 0 : res.hr.ec = TALER_JSON_get_error_code (json);
129 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
130 0 : break;
131 0 : case MHD_HTTP_CONTENT_TOO_LARGE:
132 0 : res.hr.ec = TALER_JSON_get_error_code (json);
133 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
134 0 : break;
135 0 : default:
136 : /* unexpected response code */
137 0 : GNUNET_break_op (0);
138 0 : res.hr.ec = TALER_JSON_get_error_code (json);
139 0 : res.hr.hint = TALER_JSON_get_error_hint (json);
140 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
141 : "Unexpected response code %u/%d for exchange management post keys\n",
142 : (unsigned int) response_code,
143 : (int) res.hr.ec);
144 0 : break;
145 : }
146 19 : if (NULL != pmkh->cb)
147 : {
148 19 : pmkh->cb (pmkh->cb_cls,
149 : &res);
150 19 : pmkh->cb = NULL;
151 : }
152 19 : TALER_EXCHANGE_post_management_keys_cancel (pmkh);
153 19 : }
154 :
155 :
156 : struct TALER_EXCHANGE_PostManagementKeysHandle *
157 19 : TALER_EXCHANGE_post_management_keys_create (
158 : struct GNUNET_CURL_Context *ctx,
159 : const char *url,
160 : const struct TALER_EXCHANGE_ManagementPostKeysData *pkd)
161 : {
162 : struct TALER_EXCHANGE_PostManagementKeysHandle *pmkh;
163 :
164 19 : pmkh = GNUNET_new (struct TALER_EXCHANGE_PostManagementKeysHandle);
165 19 : pmkh->ctx = ctx;
166 19 : pmkh->base_url = GNUNET_strdup (url);
167 19 : pmkh->num_sign_sigs = pkd->num_sign_sigs;
168 19 : pmkh->num_denom_sigs = pkd->num_denom_sigs;
169 19 : pmkh->sign_sigs = GNUNET_memdup (pkd->sign_sigs,
170 : pkd->num_sign_sigs
171 : * sizeof (struct
172 : TALER_EXCHANGE_SigningKeySignature)
173 : );
174 19 : pmkh->denom_sigs = GNUNET_memdup (pkd->denom_sigs,
175 : pkd->num_denom_sigs
176 : * sizeof (struct
177 : TALER_EXCHANGE_DenominationKeySignature));
178 19 : return pmkh;
179 : }
180 :
181 :
182 : enum TALER_ErrorCode
183 19 : TALER_EXCHANGE_post_management_keys_start (
184 : struct TALER_EXCHANGE_PostManagementKeysHandle *pmkh,
185 : TALER_EXCHANGE_PostManagementKeysCallback cb,
186 : TALER_EXCHANGE_POST_MANAGEMENT_KEYS_RESULT_CLOSURE *cb_cls)
187 : {
188 : CURL *eh;
189 : json_t *body;
190 : json_t *denom_sigs;
191 : json_t *signkey_sigs;
192 :
193 19 : pmkh->cb = cb;
194 19 : pmkh->cb_cls = cb_cls;
195 19 : pmkh->url = TALER_url_join (pmkh->base_url,
196 : "management/keys",
197 : NULL);
198 19 : if (NULL == pmkh->url)
199 : {
200 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
201 : "Could not construct request URL.\n");
202 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
203 : }
204 19 : denom_sigs = json_array ();
205 19 : GNUNET_assert (NULL != denom_sigs);
206 488 : for (unsigned int i = 0; i < pmkh->num_denom_sigs; i++)
207 : {
208 469 : const struct TALER_EXCHANGE_DenominationKeySignature *dks
209 469 : = &pmkh->denom_sigs[i];
210 :
211 469 : GNUNET_assert (0 ==
212 : json_array_append_new (
213 : denom_sigs,
214 : GNUNET_JSON_PACK (
215 : GNUNET_JSON_pack_data_auto ("h_denom_pub",
216 : &dks->h_denom_pub),
217 : GNUNET_JSON_pack_data_auto ("master_sig",
218 : &dks->master_sig))));
219 : }
220 19 : signkey_sigs = json_array ();
221 19 : GNUNET_assert (NULL != signkey_sigs);
222 40 : for (unsigned int i = 0; i < pmkh->num_sign_sigs; i++)
223 : {
224 21 : const struct TALER_EXCHANGE_SigningKeySignature *sks
225 21 : = &pmkh->sign_sigs[i];
226 :
227 21 : GNUNET_assert (0 ==
228 : json_array_append_new (
229 : signkey_sigs,
230 : GNUNET_JSON_PACK (
231 : GNUNET_JSON_pack_data_auto ("exchange_pub",
232 : &sks->exchange_pub),
233 : GNUNET_JSON_pack_data_auto ("master_sig",
234 : &sks->master_sig))));
235 : }
236 19 : body = GNUNET_JSON_PACK (
237 : GNUNET_JSON_pack_array_steal ("denom_sigs",
238 : denom_sigs),
239 : GNUNET_JSON_pack_array_steal ("signkey_sigs",
240 : signkey_sigs));
241 19 : eh = TALER_EXCHANGE_curl_easy_get_ (pmkh->url);
242 38 : if ( (NULL == eh) ||
243 : (GNUNET_OK !=
244 19 : TALER_curl_easy_post (&pmkh->post_ctx,
245 : eh,
246 : body)) )
247 : {
248 0 : GNUNET_break (0);
249 0 : if (NULL != eh)
250 0 : curl_easy_cleanup (eh);
251 0 : json_decref (body);
252 0 : GNUNET_free (pmkh->url);
253 0 : pmkh->url = NULL;
254 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
255 : }
256 19 : json_decref (body);
257 19 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
258 : "Requesting URL '%s'\n",
259 : pmkh->url);
260 38 : pmkh->job = GNUNET_CURL_job_add2 (pmkh->ctx,
261 : eh,
262 19 : pmkh->post_ctx.headers,
263 : &handle_post_keys_finished,
264 : pmkh);
265 19 : if (NULL == pmkh->job)
266 : {
267 0 : TALER_curl_easy_post_finished (&pmkh->post_ctx);
268 0 : GNUNET_free (pmkh->url);
269 0 : pmkh->url = NULL;
270 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
271 : }
272 19 : return TALER_EC_NONE;
273 : }
274 :
275 :
276 : void
277 19 : TALER_EXCHANGE_post_management_keys_cancel (
278 : struct TALER_EXCHANGE_PostManagementKeysHandle *pmkh)
279 : {
280 19 : if (NULL != pmkh->job)
281 : {
282 0 : GNUNET_CURL_job_cancel (pmkh->job);
283 0 : pmkh->job = NULL;
284 : }
285 19 : TALER_curl_easy_post_finished (&pmkh->post_ctx);
286 19 : GNUNET_free (pmkh->sign_sigs);
287 19 : GNUNET_free (pmkh->denom_sigs);
288 19 : GNUNET_free (pmkh->url);
289 19 : GNUNET_free (pmkh->base_url);
290 19 : GNUNET_free (pmkh);
291 19 : }
292 :
293 :
294 : /* end of exchange_api_post-management-keys.c */
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