485 lines
12 KiB
C
485 lines
12 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2014, 2015 GNUnet e.V.
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU Affero General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License along with
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TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file mint-lib/mint_api_json.c
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* @brief functions to parse incoming requests (JSON snippets)
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* @author Florian Dold
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* @author Benedikt Mueller
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include "mint_api_json.h"
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/**
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* Navigate and parse data in a JSON tree.
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*
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* @param root the JSON node to start the navigation at.
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* @param spec parse specification array
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* @return offset in @a spec where parsing failed, -1 on success (!)
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*/
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static int
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parse_json (json_t *root,
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struct MAJ_Specification *spec)
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{
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int i;
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json_t *pos; /* what's our current position? */
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pos = root;
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for (i=0;MAJ_CMD_END != spec[i].cmd;i++)
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{
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pos = json_object_get (root,
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spec[i].field);
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if (NULL == pos)
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{
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GNUNET_break_op (0);
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return i;
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}
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switch (spec[i].cmd)
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{
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case MAJ_CMD_END:
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GNUNET_assert (0);
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return i;
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case MAJ_CMD_AMOUNT:
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if (GNUNET_OK !=
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TALER_json_to_amount (pos,
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spec[i].details.amount))
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{
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GNUNET_break_op (0);
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return i;
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}
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break;
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case MAJ_CMD_TIME_ABSOLUTE:
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if (GNUNET_OK !=
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TALER_json_to_abs (pos,
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spec[i].details.abs_time))
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{
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GNUNET_break_op (0);
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return i;
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}
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break;
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case MAJ_CMD_STRING:
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{
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const char *str;
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str = json_string_value (pos);
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if (NULL == str)
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{
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GNUNET_break_op (0);
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return i;
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}
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*spec[i].details.strptr = str;
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}
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break;
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case MAJ_CMD_BINARY_FIXED:
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{
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const char *str;
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int res;
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str = json_string_value (pos);
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if (NULL == str)
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{
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GNUNET_break_op (0);
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return i;
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}
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res = GNUNET_STRINGS_string_to_data (str, strlen (str),
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spec[i].details.fixed_data.dest,
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spec[i].details.fixed_data.dest_size);
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if (GNUNET_OK != res)
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{
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GNUNET_break_op (0);
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return i;
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}
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}
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break;
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case MAJ_CMD_BINARY_VARIABLE:
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{
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const char *str;
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size_t size;
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void *data;
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int res;
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str = json_string_value (pos);
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if (NULL == str)
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{
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GNUNET_break_op (0);
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return i;
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}
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size = (strlen (str) * 5) / 8;
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if (size >= 1024)
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{
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GNUNET_break_op (0);
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return i;
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}
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data = GNUNET_malloc (size);
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res = GNUNET_STRINGS_string_to_data (str,
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strlen (str),
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data,
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size);
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if (GNUNET_OK != res)
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{
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GNUNET_break_op (0);
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GNUNET_free (data);
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return i;
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}
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*spec[i].details.variable_data.dest_p = data;
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*spec[i].details.variable_data.dest_size_p = size;
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}
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break;
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case MAJ_CMD_RSA_PUBLIC_KEY:
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{
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size_t size;
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const char *str;
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int res;
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void *buf;
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str = json_string_value (pos);
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if (NULL == str)
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{
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GNUNET_break_op (0);
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return i;
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}
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size = (strlen (str) * 5) / 8;
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buf = GNUNET_malloc (size);
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res = GNUNET_STRINGS_string_to_data (str,
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strlen (str),
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buf,
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size);
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if (GNUNET_OK != res)
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{
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GNUNET_free (buf);
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GNUNET_break_op (0);
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return i;
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}
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*spec[i].details.rsa_public_key
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= GNUNET_CRYPTO_rsa_public_key_decode (buf,
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size);
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GNUNET_free (buf);
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if (NULL == spec[i].details.rsa_public_key)
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{
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GNUNET_break_op (0);
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return i;
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}
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}
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break;
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case MAJ_CMD_RSA_SIGNATURE:
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{
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size_t size;
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const char *str;
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int res;
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void *buf;
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str = json_string_value (pos);
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if (NULL == str)
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{
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GNUNET_break_op (0);
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return i;
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}
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size = (strlen (str) * 5) / 8;
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buf = GNUNET_malloc (size);
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res = GNUNET_STRINGS_string_to_data (str,
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strlen (str),
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buf,
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size);
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if (GNUNET_OK != res)
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{
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GNUNET_free (buf);
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GNUNET_break_op (0);
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return i;
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}
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*spec[i].details.rsa_signature
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= GNUNET_CRYPTO_rsa_signature_decode (buf,
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size);
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GNUNET_free (buf);
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if (NULL == spec[i].details.rsa_signature)
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return i;
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}
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break;
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case MAJ_CMD_EDDSA_SIGNATURE:
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{
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struct TALER_CoinSpendSignatureP sig;
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struct GNUNET_CRYPTO_EccSignaturePurpose *purpose;
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size_t size;
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struct MAJ_Specification sig_spec[] = {
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MAJ_spec_fixed_auto ("eddsa_sig", &sig),
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MAJ_spec_varsize ("eddsa_val", (void**) &purpose, &size),
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MAJ_spec_end
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};
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if (GNUNET_OK !=
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MAJ_parse_json (pos,
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sig_spec))
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{
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GNUNET_break_op (0);
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MAJ_parse_free (sig_spec);
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return i;
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}
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if (size != ntohl (purpose->size))
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{
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GNUNET_break_op (0);
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MAJ_parse_free (sig_spec);
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return i;
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}
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if (GNUNET_OK !=
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GNUNET_CRYPTO_eddsa_verify (ntohl (purpose->purpose),
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purpose,
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&sig.eddsa_signature,
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spec[i].details.eddsa_signature.pub_key))
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{
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GNUNET_break_op (0);
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MAJ_parse_free (sig_spec);
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return i;
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}
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*spec[i].details.eddsa_signature.purpose_p = purpose;
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}
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break;
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default:
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GNUNET_break (0);
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return i;
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}
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}
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return -1; /* all OK! */
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}
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/**
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* Free all elements allocated during a
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* #MAJ_parse_json() operation.
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*
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* @param spec specification of the parse operation
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* @param end number of elements in @a spec to process
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*/
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static void
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parse_free (struct MAJ_Specification *spec,
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int end)
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{
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int i;
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for (i=0;i<end;i++)
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{
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switch (spec[i].cmd)
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{
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case MAJ_CMD_END:
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GNUNET_assert (0);
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return;
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case MAJ_CMD_AMOUNT:
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break;
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case MAJ_CMD_TIME_ABSOLUTE:
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break;
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case MAJ_CMD_BINARY_FIXED:
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break;
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case MAJ_CMD_STRING:
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break;
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case MAJ_CMD_BINARY_VARIABLE:
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GNUNET_free (*spec[i].details.variable_data.dest_p);
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*spec[i].details.variable_data.dest_p = NULL;
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*spec[i].details.variable_data.dest_size_p = 0;
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break;
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case MAJ_CMD_RSA_PUBLIC_KEY:
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GNUNET_CRYPTO_rsa_public_key_free (*spec[i].details.rsa_public_key);
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*spec[i].details.rsa_public_key = NULL;
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break;
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case MAJ_CMD_RSA_SIGNATURE:
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GNUNET_CRYPTO_rsa_signature_free (*spec[i].details.rsa_signature);
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*spec[i].details.rsa_signature = NULL;
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break;
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case MAJ_CMD_EDDSA_SIGNATURE:
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GNUNET_free (*spec[i].details.eddsa_signature.purpose_p);
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*spec[i].details.eddsa_signature.purpose_p = NULL;
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break;
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default:
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GNUNET_break (0);
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break;
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}
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}
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}
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/**
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* Navigate and parse data in a JSON tree.
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*
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* @param root the JSON node to start the navigation at.
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* @param spec parse specification array
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* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
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*/
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int
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MAJ_parse_json (const json_t *root,
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struct MAJ_Specification *spec)
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{
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int ret;
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ret = parse_json ((json_t *) root,
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spec);
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if (-1 == ret)
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return GNUNET_OK;
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"JSON field `%s` (%d) had unexpected value\n",
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spec[ret].field,
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ret);
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parse_free (spec, ret);
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return GNUNET_SYSERR;
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}
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/**
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* Free all elements allocated during a
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* #MAJ_parse_json() operation.
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*
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* @param spec specification of the parse operation
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*/
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void
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MAJ_parse_free (struct MAJ_Specification *spec)
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{
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int i;
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for (i=0;MAJ_CMD_END != spec[i].cmd;i++) ;
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parse_free (spec, i);
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}
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/**
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* The expected field stores a string.
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*
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* @param name name of the JSON field
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* @param strptr where to store a pointer to the field
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*/
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struct MAJ_Specification
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MAJ_spec_string (const char *name,
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const char **strptr)
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{
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struct MAJ_Specification ret =
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{
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.cmd = MAJ_CMD_STRING,
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.field = name,
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.details.strptr = strptr
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};
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return ret;
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}
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/**
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* Specification for parsing an absolute time value.
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*
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* @param name name of the JSON field
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* @param at where to store the absolute time found under @a name
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*/
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struct MAJ_Specification
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MAJ_spec_absolute_time (const char *name,
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struct GNUNET_TIME_Absolute *at)
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{
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struct MAJ_Specification ret =
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{
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.cmd = MAJ_CMD_TIME_ABSOLUTE,
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.field = name,
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.details.abs_time = at
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};
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return ret;
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}
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/**
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* Specification for parsing an amount value.
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*
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* @param name name of the JSON field
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* @param amount where to store the amount found under @a name
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*/
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struct MAJ_Specification
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MAJ_spec_amount (const char *name,
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struct TALER_Amount *amount)
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{
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struct MAJ_Specification ret =
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{
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.cmd = MAJ_CMD_AMOUNT,
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.field = name,
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.details.amount = amount
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};
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return ret;
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}
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/**
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* Specification for parsing an RSA public key.
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*
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* @param name name of the JSON field
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* @param pk where to store the RSA key found under @a name
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*/
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struct MAJ_Specification
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MAJ_spec_rsa_public_key (const char *name,
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struct GNUNET_CRYPTO_rsa_PublicKey **pk)
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{
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struct MAJ_Specification ret =
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{
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.cmd = MAJ_CMD_RSA_PUBLIC_KEY,
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.field = name,
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.details.rsa_public_key = pk
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};
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return ret;
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}
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/**
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* Specification for parsing an RSA signature.
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*
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* @param name name of the JSON field
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* @param sig where to store the RSA signature found under @a name
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*/
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struct MAJ_Specification
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MAJ_spec_rsa_signature (const char *name,
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struct GNUNET_CRYPTO_rsa_Signature **sig)
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{
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struct MAJ_Specification ret =
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{
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.cmd = MAJ_CMD_RSA_SIGNATURE,
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.field = name,
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.details.rsa_signature = sig
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};
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return ret;
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}
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/**
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* Specification for parsing an EdDSA object signature with purpose.
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* Also validates the signature (!).
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*
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* @param name name of the JSON field
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* @param purpose_p where to store the purpose
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* @param pub_key public key to use for validation
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*/
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struct MAJ_Specification
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MAJ_spec_eddsa_signed_purpose (const char *name,
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struct GNUNET_CRYPTO_EccSignaturePurpose **purpose_p,
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const struct GNUNET_CRYPTO_EddsaPublicKey *pub_key)
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{
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struct MAJ_Specification ret =
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{
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.cmd = MAJ_CMD_EDDSA_SIGNATURE,
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.field = name,
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.details.eddsa_signature.purpose_p = purpose_p,
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.details.eddsa_signature.pub_key = pub_key
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};
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return ret;
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}
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/* end of mint_api_json.c */
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