summaryrefslogtreecommitdiff
path: root/src/mint/taler-mint-httpd_deposit.c
blob: 1e496d5a5cbe5c2a685d9f2a920b4470bd8a80ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
/*
  This file is part of TALER
  (C) 2014 GNUnet e.V.

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU Affero General Public License as published by the Free Software
  Foundation; either version 3, or (at your option) any later version.

  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License along with
  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file taler-mint-httpd_deposit.c
 * @brief Handle /deposit requests; parses the POST and JSON and
 *        verifies the coin signature before handing things off
 *        to the database.
 * @author Florian Dold
 * @author Benedikt Mueller
 * @author Christian Grothoff
 *
 * TODO:
 * - missing 'wire' format check (well-formed SEPA-details)
 * - ugliy if-construction for deposit type
 */
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <jansson.h>
#include <microhttpd.h>
#include <libpq-fe.h>
#include <pthread.h>
#include "mint.h"
#include "mint_db.h"
#include "taler_signatures.h"
#include "taler_util.h"
#include "taler-mint-httpd_parsing.h"
#include "taler-mint-httpd_keys.h"
#include "taler-mint-httpd_db.h"
#include "taler-mint-httpd_deposit.h"
#include "taler-mint-httpd_responses.h"
#include "taler-mint-httpd_keystate.h"


/**
 * We have parsed the JSON information about the deposit, do some
 * basic sanity checks (especially that the signature on the coin is
 * valid, and that this type of coin exists) and then execute the
 * deposit.
 *
 * @param connection the MHD connection to handle
 * @param deposit information about the deposit
 * @return MHD result code
 */
static int
verify_and_execute_deposit (struct MHD_Connection *connection,
                            const struct Deposit *deposit)
{
  struct MintKeyState *key_state;
  struct TALER_DepositRequest dr;
  struct TALER_MINT_DenomKeyIssuePriv *dki;

  dr.purpose.purpose = htonl (TALER_SIGNATURE_WALLET_DEPOSIT);
  dr.purpose.size = htonl (sizeof (struct TALER_DepositRequest));
  dr.h_contract = deposit->h_contract;
  dr.h_wire = deposit->h_wire;
  dr.transaction_id = GNUNET_htonll (deposit->transaction_id);
  dr.amount = TALER_amount_hton (deposit->amount);
  dr.coin_pub = deposit->coin.coin_pub;
  if (GNUNET_OK !=
      GNUNET_CRYPTO_ecdsa_verify (TALER_SIGNATURE_WALLET_DEPOSIT,
                                  &dr.purpose,
                                  &deposit->csig,
                                  &deposit->coin.coin_pub))
  {
    LOG_WARNING ("Invalid signature on /deposit request\n");
    return TALER_MINT_reply_arg_invalid (connection,
                                         "csig");
  }
  /* check denomination exists and is valid */
  key_state = TALER_MINT_key_state_acquire ();
  dki = TALER_MINT_get_denom_key (key_state,
                                  deposit->coin.denom_pub);
  if (NULL == dki)
  {
    TALER_MINT_key_state_release (key_state);
    LOG_WARNING ("Unknown denomination key in /deposit request\n");
    return TALER_MINT_reply_arg_invalid (connection,
                                         "denom_pub");
  }
  /* check coin signature */
  if (GNUNET_YES !=
      TALER_test_coin_valid (&deposit->coin))
  {
    LOG_WARNING ("Invalid coin passed for /deposit\n");
    TALER_MINT_key_state_release (key_state);
    return TALER_MINT_reply_coin_invalid (connection);
  }
  TALER_MINT_key_state_release (key_state);

  return TALER_MINT_db_execute_deposit (connection,
                                        deposit);
}


/**
 * Handle a "/deposit" request.  This function parses the
 * JSON information and then calls #verify_and_execute_deposit()
 * to verify the signatures and execute the deposit.
 *
 * @param connection the MHD connection to handle
 * @param root root of the posted JSON
 * @param purpose is this a #TALER_SIGNATURE_WALLET_DEPOSIT or
 *           #TALER_SIGNATURE_INCREMENTAL_WALLET_DEPOSIT // FIXME: bad type, use enum!
 * @param amount how much should be deposited
 * @param wire json describing the wire details (?)
 * @return MHD result code
  */
static int
parse_and_handle_deposit_request (struct MHD_Connection *connection,
                                  const json_t *root,
                                  uint32_t purpose,
                                  const struct TALER_Amount *amount,
                                  const json_t *wire)
{
  int res;
  struct Deposit deposit;
  char *wire_enc;
  size_t len;
  struct GNUNET_MINT_ParseFieldSpec spec[] = {
    TALER_MINT_PARSE_VARIABLE ("denom_pub"),
    TALER_MINT_PARSE_VARIABLE ("ubsig"),
    TALER_MINT_PARSE_FIXED ("coin_pub", &deposit.coin.coin_pub),
    TALER_MINT_PARSE_FIXED ("merchant_pub", &deposit.merchant_pub),
    TALER_MINT_PARSE_FIXED ("H_a", &deposit.h_contract),
    TALER_MINT_PARSE_FIXED ("H_wire", &deposit.h_wire),
    TALER_MINT_PARSE_FIXED ("csig",  &deposit.csig),
    TALER_MINT_PARSE_FIXED ("transaction_id", &deposit.transaction_id),
    TALER_MINT_PARSE_END
  };

  memset (&deposit, 0, sizeof (deposit));
  res = TALER_MINT_parse_json_data (connection,
                                    root,
                                    spec);
  if (GNUNET_SYSERR == res)
    return MHD_NO; /* hard failure */
  if (GNUNET_NO == res)
    return MHD_YES; /* failure */
  deposit.coin.denom_pub
    = GNUNET_CRYPTO_rsa_public_key_decode (spec[0].destination,
                                           spec[0].destination_size_out);
  if (NULL == deposit.coin.denom_pub)
  {
    LOG_WARNING ("Failed to parse denomination key for /deposit request\n");
    TALER_MINT_release_parsed_data (spec);
    return TALER_MINT_reply_arg_invalid (connection,
                                         "denom_pub");
  }
  deposit.coin.denom_sig
    = GNUNET_CRYPTO_rsa_signature_decode (spec[1].destination,
                                          spec[1].destination_size_out);
  if (NULL == deposit.coin.denom_sig)
  {
    LOG_WARNING ("Failed to parse unblinded signature for /deposit request\n");
    GNUNET_CRYPTO_rsa_public_key_free (deposit.coin.denom_pub);
    TALER_MINT_release_parsed_data (spec);
    return TALER_MINT_reply_arg_invalid (connection,
                                         "denom_pub");
  }
  /* FIXME: check that "wire" is formatted correctly */
  if (NULL == (wire_enc = json_dumps (wire, JSON_COMPACT | JSON_SORT_KEYS)))
  {
    GNUNET_CRYPTO_rsa_public_key_free (deposit.coin.denom_pub);
    GNUNET_CRYPTO_rsa_signature_free (deposit.coin.denom_sig);
    LOG_WARNING ("Failed to parse JSON wire format specification for /deposit request\n");
    TALER_MINT_release_parsed_data (spec);
    return TALER_MINT_reply_arg_invalid (connection,
                                         "wire");
  }
  len = strlen (wire_enc) + 1;
  GNUNET_CRYPTO_hash (wire_enc,
                      len,
                      &deposit.h_wire);
  GNUNET_free (wire_enc);

  deposit.wire = wire;
  deposit.purpose = purpose;
  deposit.amount = *amount;
  res = verify_and_execute_deposit (connection,
                                    &deposit);
  GNUNET_CRYPTO_rsa_public_key_free (deposit.coin.denom_pub);
  GNUNET_CRYPTO_rsa_signature_free (deposit.coin.denom_sig);
  TALER_MINT_release_parsed_data (spec);
  return res;
}


/**
 * Handle a "/deposit" request.  Parses the JSON in the post to find
 * the "type" (either DIRECT_DEPOSIT or INCREMENTAL_DEPOSIT), and, if
 * successful, passes the JSON data to
 * #parse_and_handle_deposit_request() to further check the details
 * of the operation specified in the "wire" field of the JSON data.
 * If everything checks out, this will ultimately lead to the
 * "/deposit" being executed, or rejected.
 *
 * @param rh context of the handler
 * @param connection the MHD connection to handle
 * @param[IN|OUT] connection_cls the connection's closure (can be updated)
 * @param upload_data upload data
 * @param[IN|OUT] upload_data_size number of bytes (left) in @a upload_data
 * @return MHD result code
  */
int
TALER_MINT_handler_deposit (struct RequestHandler *rh,
                            struct MHD_Connection *connection,
                            void **connection_cls,
                            const char *upload_data,
                            size_t *upload_data_size)
{
  json_t *json;
  json_t *wire;
  const char *deposit_type;
  int res;
  uint32_t purpose;
  struct TALER_Amount amount;
  json_t *f;

  res = TALER_MINT_parse_post_json (connection,
                                    connection_cls,
                                    upload_data,
                                    upload_data_size,
                                    &json);
  if (GNUNET_SYSERR == res)
    return MHD_NO;
  if ( (GNUNET_NO == res) || (NULL == json) )
    return MHD_YES;
  if (-1 == json_unpack (json,
                         "{s:s, s:o, f:o}",
                         "type", &deposit_type,
                         "wire", &wire,
                         "f", &f))
  {
    GNUNET_break_op (0);
    json_decref (json);
    return TALER_MINT_reply_json_pack (connection,
                                       MHD_HTTP_BAD_REQUEST,
                                       "{s:s}",
                                       "error", "Bad format");
  }
  res = TALER_MINT_parse_amount_json (connection,
                                      f,
                                      &amount);
  json_decref (f);
  if (GNUNET_SYSERR == res)
  {
    json_decref (wire);
    json_decref (json);
    return MHD_NO;
  }
  if (GNUNET_NO == res)
  {
    json_decref (wire);
    json_decref (json);
    return MHD_YES;
  }
  /* FIXME: use array search and enum, this is ugly */
  if (0 == strcmp ("DIRECT_DEPOSIT", deposit_type))
    purpose = TALER_SIGNATURE_WALLET_DEPOSIT;
  else if (0 == strcmp ("INCREMENTAL_DEPOSIT", deposit_type))
    purpose = TALER_SIGNATURE_INCREMENTAL_WALLET_DEPOSIT;
  else
  {
    GNUNET_break_op (0);
    json_decref (wire);
    json_decref (json);
    return TALER_MINT_reply_json_pack (connection,
                                       MHD_HTTP_BAD_REQUEST,
                                       "{s:s}",
                                       "error", "Bad format");
  }
  res = parse_and_handle_deposit_request (connection,
                                          json,
                                          purpose,
                                          &amount,
                                          wire);
  json_decref (wire);
  json_decref (json);
  return res;
}


/* end of taler-mint-httpd_deposit.c */