Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2015-2021 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_management_post_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/platform.h"
23 : #include "taler/taler_json_lib.h"
24 : #include <gnunet/gnunet_curl_lib.h>
25 : #include <microhttpd.h>
26 : #include "taler/taler_exchange_service.h"
27 : #include "exchange_api_curl_defaults.h"
28 : #include "taler/taler_signatures.h"
29 : #include "taler/taler_curl_lib.h"
30 : #include "taler/taler_json_lib.h"
31 :
32 :
33 : /**
34 : * @brief Handle for a POST /management/keys request.
35 : */
36 : struct TALER_EXCHANGE_ManagementPostKeysHandle
37 : {
38 :
39 : /**
40 : * The url for this request.
41 : */
42 : char *url;
43 :
44 : /**
45 : * Minor context that holds body and headers.
46 : */
47 : struct TALER_CURL_PostContext post_ctx;
48 :
49 : /**
50 : * Handle for the request.
51 : */
52 : struct GNUNET_CURL_Job *job;
53 :
54 : /**
55 : * Function to call with the result.
56 : */
57 : TALER_EXCHANGE_ManagementPostKeysCallback cb;
58 :
59 : /**
60 : * Closure for @a cb.
61 : */
62 : void *cb_cls;
63 :
64 : /**
65 : * Reference to the execution context.
66 : */
67 : struct GNUNET_CURL_Context *ctx;
68 : };
69 :
70 :
71 : /**
72 : * Function called when we're done processing the
73 : * HTTP POST /management/keys request.
74 : *
75 : * @param cls the `struct TALER_EXCHANGE_ManagementPostKeysHandle *`
76 : * @param response_code HTTP response code, 0 on error
77 : * @param response response body, NULL if not in JSON
78 : */
79 : static void
80 21 : handle_post_keys_finished (void *cls,
81 : long response_code,
82 : const void *response)
83 : {
84 21 : struct TALER_EXCHANGE_ManagementPostKeysHandle *ph = cls;
85 21 : const json_t *json = response;
86 21 : struct TALER_EXCHANGE_ManagementPostKeysResponse pkr = {
87 21 : .hr.http_status = (unsigned int) response_code,
88 : .hr.reply = json
89 : };
90 :
91 21 : ph->job = NULL;
92 21 : switch (response_code)
93 : {
94 21 : case MHD_HTTP_NO_CONTENT:
95 21 : break;
96 0 : case MHD_HTTP_FORBIDDEN:
97 0 : pkr.hr.ec = TALER_JSON_get_error_code (json);
98 0 : pkr.hr.hint = TALER_JSON_get_error_hint (json);
99 0 : break;
100 0 : case MHD_HTTP_NOT_FOUND:
101 0 : pkr.hr.ec = TALER_JSON_get_error_code (json);
102 0 : pkr.hr.hint = TALER_JSON_get_error_hint (json);
103 0 : break;
104 0 : case MHD_HTTP_REQUEST_ENTITY_TOO_LARGE:
105 0 : pkr.hr.ec = TALER_JSON_get_error_code (json);
106 0 : pkr.hr.hint = TALER_JSON_get_error_hint (json);
107 0 : break;
108 0 : default:
109 : /* unexpected response code */
110 0 : GNUNET_break_op (0);
111 0 : pkr.hr.ec = TALER_JSON_get_error_code (json);
112 0 : pkr.hr.hint = TALER_JSON_get_error_hint (json);
113 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
114 : "Unexpected response code %u/%d for exchange management post keys\n",
115 : (unsigned int) response_code,
116 : (int) pkr.hr.ec);
117 0 : break;
118 : }
119 21 : if (NULL != ph->cb)
120 : {
121 21 : ph->cb (ph->cb_cls,
122 : &pkr);
123 21 : ph->cb = NULL;
124 : }
125 21 : TALER_EXCHANGE_post_management_keys_cancel (ph);
126 21 : }
127 :
128 :
129 : struct TALER_EXCHANGE_ManagementPostKeysHandle *
130 21 : TALER_EXCHANGE_post_management_keys (
131 : struct GNUNET_CURL_Context *ctx,
132 : const char *url,
133 : const struct TALER_EXCHANGE_ManagementPostKeysData *pkd,
134 : TALER_EXCHANGE_ManagementPostKeysCallback cb,
135 : void *cb_cls)
136 : {
137 : struct TALER_EXCHANGE_ManagementPostKeysHandle *ph;
138 : CURL *eh;
139 : json_t *body;
140 : json_t *denom_sigs;
141 : json_t *signkey_sigs;
142 :
143 21 : ph = GNUNET_new (struct TALER_EXCHANGE_ManagementPostKeysHandle);
144 21 : ph->cb = cb;
145 21 : ph->cb_cls = cb_cls;
146 21 : ph->ctx = ctx;
147 21 : ph->url = TALER_url_join (url,
148 : "management/keys",
149 : NULL);
150 21 : if (NULL == ph->url)
151 : {
152 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
153 : "Could not construct request URL.\n");
154 0 : GNUNET_free (ph);
155 0 : return NULL;
156 : }
157 21 : denom_sigs = json_array ();
158 21 : GNUNET_assert (NULL != denom_sigs);
159 6241 : for (unsigned int i = 0; i<pkd->num_denom_sigs; i++)
160 : {
161 6220 : const struct TALER_EXCHANGE_DenominationKeySignature *dks
162 6220 : = &pkd->denom_sigs[i];
163 :
164 6220 : GNUNET_assert (0 ==
165 : json_array_append_new (
166 : denom_sigs,
167 : GNUNET_JSON_PACK (
168 : GNUNET_JSON_pack_data_auto ("h_denom_pub",
169 : &dks->h_denom_pub),
170 : GNUNET_JSON_pack_data_auto ("master_sig",
171 : &dks->master_sig))));
172 : }
173 21 : signkey_sigs = json_array ();
174 21 : GNUNET_assert (NULL != signkey_sigs);
175 88 : for (unsigned int i = 0; i<pkd->num_sign_sigs; i++)
176 : {
177 67 : const struct TALER_EXCHANGE_SigningKeySignature *sks
178 67 : = &pkd->sign_sigs[i];
179 :
180 67 : GNUNET_assert (0 ==
181 : json_array_append_new (
182 : signkey_sigs,
183 : GNUNET_JSON_PACK (
184 : GNUNET_JSON_pack_data_auto ("exchange_pub",
185 : &sks->exchange_pub),
186 : GNUNET_JSON_pack_data_auto ("master_sig",
187 : &sks->master_sig))));
188 : }
189 21 : body = GNUNET_JSON_PACK (
190 : GNUNET_JSON_pack_array_steal ("denom_sigs",
191 : denom_sigs),
192 : GNUNET_JSON_pack_array_steal ("signkey_sigs",
193 : signkey_sigs));
194 21 : eh = TALER_EXCHANGE_curl_easy_get_ (ph->url);
195 42 : if ( (NULL == eh) ||
196 : (GNUNET_OK !=
197 21 : TALER_curl_easy_post (&ph->post_ctx,
198 : eh,
199 : body)) )
200 : {
201 0 : GNUNET_break (0);
202 0 : if (NULL != eh)
203 0 : curl_easy_cleanup (eh);
204 0 : json_decref (body);
205 0 : GNUNET_free (ph->url);
206 0 : return NULL;
207 : }
208 21 : json_decref (body);
209 21 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
210 : "Requesting URL '%s'\n",
211 : ph->url);
212 42 : ph->job = GNUNET_CURL_job_add2 (ctx,
213 : eh,
214 21 : ph->post_ctx.headers,
215 : &handle_post_keys_finished,
216 : ph);
217 21 : if (NULL == ph->job)
218 : {
219 0 : TALER_EXCHANGE_post_management_keys_cancel (ph);
220 0 : return NULL;
221 : }
222 21 : return ph;
223 : }
224 :
225 :
226 : void
227 21 : TALER_EXCHANGE_post_management_keys_cancel (
228 : struct TALER_EXCHANGE_ManagementPostKeysHandle *ph)
229 : {
230 21 : if (NULL != ph->job)
231 : {
232 0 : GNUNET_CURL_job_cancel (ph->job);
233 0 : ph->job = NULL;
234 : }
235 21 : TALER_curl_easy_post_finished (&ph->post_ctx);
236 21 : GNUNET_free (ph->url);
237 21 : GNUNET_free (ph);
238 21 : }
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