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|
/*
This file is part of TALER
Copyright (C) 2014, 2015, 2016, 2020, 2021 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file json/json.c
* @brief helper functions for JSON processing using libjansson
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler_util.h"
#include "taler_json_lib.h"
#include <unistr.h>
/**
* Check if @a json contains a 'real' value anywhere.
*
* @param json json to check
* @return true if a real is in it somewhere
*/
static bool
contains_real (const json_t *json)
{
if (json_is_real (json))
return true;
if (json_is_object (json))
{
json_t *member;
const char *name;
json_object_foreach ((json_t *) json, name, member)
if (contains_real (member))
return true;
return false;
}
if (json_is_array (json))
{
json_t *member;
size_t index;
json_array_foreach ((json_t *) json, index, member)
if (contains_real (member))
return true;
return false;
}
return false;
}
/**
* Dump character in the low range into @a buf
* following RFC 8785.
*
* @param[in,out] buf buffer to modify
* @param val value to dump
*/
static void
lowdump (struct GNUNET_Buffer *buf,
unsigned char val)
{
char scratch[7];
switch (val)
{
case 0x8:
GNUNET_buffer_write (buf,
"\\b",
2);
break;
case 0x9:
GNUNET_buffer_write (buf,
"\\t",
2);
break;
case 0xA:
GNUNET_buffer_write (buf,
"\\n",
2);
break;
case 0xC:
GNUNET_buffer_write (buf,
"\\f",
2);
break;
case 0xD:
GNUNET_buffer_write (buf,
"\\r",
2);
break;
default:
GNUNET_snprintf (scratch,
sizeof (scratch),
"\\u%04x",
(unsigned int) val);
GNUNET_buffer_write (buf,
scratch,
6);
break;
}
}
/**
* Re-encode string at @a inp to match RFC 8785 (section 3.2.2.2).
*
* @param[in,out] inp pointer to string to re-encode
* @return number of bytes in resulting @a inp
*/
static size_t
rfc8785encode (char **inp)
{
struct GNUNET_Buffer buf = { 0 };
size_t left = strlen (*inp) + 1;
size_t olen;
char *in = *inp;
const char *pos = in;
GNUNET_buffer_prealloc (&buf,
left + 40);
buf.warn_grow = 0; /* disable, + 40 is just a wild guess */
while (1)
{
int mbl = u8_mblen ((unsigned char *) pos,
left);
unsigned char val;
if (0 == mbl)
break;
val = (unsigned char) *pos;
if ( (1 == mbl) &&
(val <= 0x1F) )
{
lowdump (&buf,
val);
}
else if ( (1 == mbl) && ('\\' == *pos) )
{
switch (*(pos + 1))
{
case '\\':
mbl = 2;
GNUNET_buffer_write (&buf,
pos,
mbl);
break;
case 'u':
{
unsigned int num;
uint32_t n32;
unsigned char res[8];
size_t rlen;
GNUNET_assert ( (1 ==
sscanf (pos + 2,
"%4x",
&num)) ||
(1 ==
sscanf (pos + 2,
"%4X",
&num)) );
mbl = 6;
n32 = (uint32_t) num;
rlen = sizeof (res);
u32_to_u8 (&n32,
1,
res,
&rlen);
if ( (1 == rlen) &&
(res[0] <= 0x1F) )
{
lowdump (&buf,
res[0]);
}
else
{
GNUNET_buffer_write (&buf,
(const char *) res,
rlen);
}
}
break;
}
}
else
{
GNUNET_buffer_write (&buf,
pos,
mbl);
}
left -= mbl;
pos += mbl;
}
/* 0-terminate buffer */
GNUNET_buffer_write (&buf,
"",
1);
GNUNET_free (in);
*inp = GNUNET_buffer_reap (&buf,
&olen);
return olen;
}
/**
* Dump the @a json to a string and hash it.
*
* @param json value to hash
* @param salt salt value to include when using HKDF,
* NULL to not use any salt and to use SHA512
* @param[out] hc where to store the hash
* @return #GNUNET_OK on success,
* #GNUNET_NO if @a json was not hash-able
* #GNUNET_SYSERR on failure
*/
static enum GNUNET_GenericReturnValue
dump_and_hash (const json_t *json,
const char *salt,
struct GNUNET_HashCode *hc)
{
char *wire_enc;
size_t len;
if (NULL == json)
{
GNUNET_break_op (0);
return GNUNET_NO;
}
if (contains_real (json))
{
GNUNET_break_op (0);
return GNUNET_NO;
}
if (NULL == (wire_enc = json_dumps (json,
JSON_ENCODE_ANY
| JSON_COMPACT
| JSON_SORT_KEYS)))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
len = rfc8785encode (&wire_enc);
if (NULL == salt)
{
GNUNET_CRYPTO_hash (wire_enc,
len,
hc);
}
else
{
if (GNUNET_YES !=
GNUNET_CRYPTO_kdf (hc,
sizeof (*hc),
salt,
strlen (salt) + 1,
wire_enc,
len,
NULL,
0))
{
GNUNET_break (0);
free (wire_enc);
return GNUNET_SYSERR;
}
}
free (wire_enc);
return GNUNET_OK;
}
/**
* Replace "forgettable" parts of a JSON object with their salted hash.
*
* @param[in] in some JSON value
* @param[out] out resulting JSON value
* @return #GNUNET_OK on success,
* #GNUNET_NO if @a json was not hash-able
* #GNUNET_SYSERR on failure
*/
static enum GNUNET_GenericReturnValue
forget (const json_t *in,
json_t **out)
{
if (json_is_real (in))
{
/* floating point is not allowed! */
GNUNET_break_op (0);
return GNUNET_NO;
}
if (json_is_array (in))
{
/* array is a JSON array */
size_t index;
json_t *value;
json_t *ret;
ret = json_array ();
if (NULL == ret)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
json_array_foreach (in, index, value) {
enum GNUNET_GenericReturnValue iret;
json_t *t;
iret = forget (value,
&t);
if (GNUNET_OK != iret)
{
json_decref (ret);
return iret;
}
if (0 != json_array_append_new (ret,
t))
{
GNUNET_break (0);
json_decref (ret);
return GNUNET_SYSERR;
}
}
*out = ret;
return GNUNET_OK;
}
if (json_is_object (in))
{
json_t *ret;
const char *key;
json_t *value;
json_t *fg;
json_t *rx;
fg = json_object_get (in,
"$forgettable");
rx = json_object_get (in,
"$forgotten");
if (NULL != rx)
{
rx = json_deep_copy (rx); /* should be shallow
by structure, but
deep copy is safer */
if (NULL == rx)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
}
ret = json_object ();
if (NULL == ret)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
json_object_foreach ((json_t*) in, key, value) {
json_t *t;
json_t *salt;
enum GNUNET_GenericReturnValue iret;
if (fg == value)
continue; /* skip! */
if (rx == value)
continue; /* skip! */
if ( (NULL != rx) &&
(NULL !=
json_object_get (rx,
key)) )
{
(void) json_object_del (ret,
key);
continue; /* already forgotten earlier */
}
iret = forget (value,
&t);
if (GNUNET_OK != iret)
{
json_decref (ret);
json_decref (rx);
return iret;
}
if ( (NULL != fg) &&
(NULL != (salt = json_object_get (fg,
key))) )
{
/* 't' is to be forgotten! */
struct GNUNET_HashCode hc;
if (! json_is_string (salt))
{
GNUNET_break_op (0);
json_decref (ret);
json_decref (rx);
json_decref (t);
return GNUNET_NO;
}
iret = dump_and_hash (t,
json_string_value (salt),
&hc);
if (GNUNET_OK != iret)
{
json_decref (ret);
json_decref (rx);
json_decref (t);
return iret;
}
json_decref (t);
/* scrub salt */
if (0 !=
json_object_del (fg,
key))
{
GNUNET_break_op (0);
json_decref (ret);
json_decref (rx);
return GNUNET_NO;
}
if (NULL == rx)
rx = json_object ();
if (NULL == rx)
{
GNUNET_break (0);
json_decref (ret);
return GNUNET_SYSERR;
}
if (0 !=
json_object_set_new (rx,
key,
GNUNET_JSON_from_data_auto (&hc)))
{
GNUNET_break (0);
json_decref (ret);
json_decref (rx);
return GNUNET_SYSERR;
}
}
else
{
/* 't' to be used without 'forgetting' */
if (0 !=
json_object_set_new (ret,
key,
t))
{
GNUNET_break (0);
json_decref (ret);
json_decref (rx);
return GNUNET_SYSERR;
}
}
} /* json_object_foreach */
if ( (NULL != rx) &&
(0 !=
json_object_set_new (ret,
"$forgotten",
rx)) )
{
GNUNET_break (0);
json_decref (ret);
return GNUNET_SYSERR;
}
*out = ret;
return GNUNET_OK;
}
*out = json_incref ((json_t *) in);
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_JSON_contract_hash (const json_t *json,
struct TALER_PrivateContractHash *hc)
{
enum GNUNET_GenericReturnValue ret;
json_t *cjson;
json_t *dc;
dc = json_deep_copy (json);
ret = forget (dc,
&cjson);
json_decref (dc);
if (GNUNET_OK != ret)
return ret;
ret = dump_and_hash (cjson,
NULL,
&hc->hash);
json_decref (cjson);
return ret;
}
enum GNUNET_GenericReturnValue
TALER_JSON_contract_mark_forgettable (json_t *json,
const char *field)
{
json_t *fg;
struct GNUNET_ShortHashCode salt;
if (! json_is_object (json))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
/* check field name is legal for forgettable field */
for (const char *f = field; '\0' != *f; f++)
{
char c = *f;
if ( (c >= 'a') && (c <= 'z') )
continue;
if ( (c >= 'A') && (c <= 'Z') )
continue;
if ( (c >= '0') && (c <= '9') )
continue;
if ('_' == c)
continue;
GNUNET_break (0);
return GNUNET_SYSERR;
}
if (NULL == json_object_get (json,
field))
{
/* field must exist */
GNUNET_break (0);
return GNUNET_SYSERR;
}
fg = json_object_get (json,
"$forgettable");
if (NULL == fg)
{
fg = json_object ();
if (0 !=
json_object_set_new (json,
"$forgettable",
fg))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
}
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
&salt,
sizeof (salt));
if (0 !=
json_object_set_new (fg,
field,
GNUNET_JSON_from_data_auto (&salt)))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_JSON_contract_part_forget (json_t *json,
const char *field)
{
json_t *fg;
const json_t *part;
json_t *fp;
json_t *rx;
struct GNUNET_HashCode hc;
const char *salt;
enum GNUNET_GenericReturnValue ret;
if (! json_is_object (json))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
if (NULL == (part = json_object_get (json,
field)))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Did not find field `%s' we were asked to forget\n",
field);
return GNUNET_SYSERR;
}
fg = json_object_get (json,
"$forgettable");
if (NULL == fg)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Did not find '$forgettable' attribute trying to forget field `%s'\n",
field);
return GNUNET_SYSERR;
}
rx = json_object_get (json,
"$forgotten");
if (NULL == rx)
{
rx = json_object ();
if (0 !=
json_object_set_new (json,
"$forgotten",
rx))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
}
if (NULL !=
json_object_get (rx,
field))
{
if (! json_is_null (json_object_get (json,
field)))
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Field `%s' market as forgotten, but still exists!\n",
field);
return GNUNET_SYSERR;
}
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Already forgot field `%s'\n",
field);
return GNUNET_NO;
}
salt = json_string_value (json_object_get (fg,
field));
if (NULL == salt)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Did not find required salt to forget field `%s'\n",
field);
return GNUNET_SYSERR;
}
/* need to recursively forget to compute 'hc' */
ret = forget (part,
&fp);
if (GNUNET_OK != ret)
return ret;
if (GNUNET_OK !=
dump_and_hash (fp,
salt,
&hc))
{
json_decref (fp);
GNUNET_break (0);
return GNUNET_SYSERR;
}
json_decref (fp);
/* drop salt */
if (0 !=
json_object_del (fg,
field))
{
json_decref (fp);
GNUNET_break (0);
return GNUNET_SYSERR;
}
/* remember field as 'forgotten' */
if (0 !=
json_object_set_new (rx,
field,
GNUNET_JSON_from_data_auto (&hc)))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
/* finally, set 'forgotten' field to null */
if (0 !=
json_object_del (json,
field))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Look over all of the values of a '$forgettable' object. Replace 'True'
* values with proper random salts. Fails if any forgettable values are
* neither 'True' nor valid salts (strings).
*
* @param[in,out] f JSON to transform
* @return #GNUNET_OK on success
*/
static enum GNUNET_GenericReturnValue
seed_forgettable (json_t *f)
{
const char *key;
json_t *val;
json_object_foreach (f,
key,
val)
{
if (json_is_string (val))
continue;
if (json_is_true (val))
{
struct GNUNET_ShortHashCode sh;
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
&sh,
sizeof (sh));
if (0 !=
json_object_set_new (f,
key,
GNUNET_JSON_from_data_auto (&sh)))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
continue;
}
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Forgettable field `%s' has invalid value\n",
key);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Take a given contract with "forgettable" fields marked
* but with 'True' instead of a real salt. Replaces all
* 'True' values with proper random salts. Fails if any
* forgettable markers are neither 'True' nor valid salts.
*
* @param[in,out] json JSON to transform
* @return #GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
TALER_JSON_contract_seed_forgettable (json_t *json)
{
if (json_is_object (json))
{
const char *key;
json_t *val;
json_object_foreach (json,
key,
val)
{
if (0 == strcmp ("$forgettable",
key))
{
if (GNUNET_OK !=
seed_forgettable (val))
return GNUNET_SYSERR;
continue;
}
if (GNUNET_OK !=
TALER_JSON_contract_seed_forgettable (val))
return GNUNET_SYSERR;
}
}
if (json_is_array (json))
{
size_t index;
json_t *val;
json_array_foreach (json,
index,
val)
{
if (GNUNET_OK !=
TALER_JSON_contract_seed_forgettable (val))
return GNUNET_SYSERR;
}
}
return GNUNET_OK;
}
/**
* Parse a json path.
*
* @param obj the object that the path is relative to.
* @param prev the parent of @e obj.
* @param path the path to parse.
* @param cb the callback to call, if we get to the end of @e path.
* @param cb_cls the closure for the callback.
* @return #GNUNET_OK on success, #GNUNET_SYSERR if @e path is malformed.
*/
static enum GNUNET_GenericReturnValue
parse_path (json_t *obj,
json_t *prev,
const char *path,
TALER_JSON_ExpandPathCallback cb,
void *cb_cls)
{
char *id = GNUNET_strdup (path);
char *next_id = strchr (id,
'.');
char *next_path;
char *bracket;
json_t *next_obj = NULL;
char *next_dot;
if (NULL == next_id)
{
cb (cb_cls,
id,
prev);
GNUNET_free (id);
return GNUNET_OK;
}
bracket = strchr (next_id,
'[');
*next_id = '\0';
next_id++;
next_path = GNUNET_strdup (next_id);
next_dot = strchr (next_id,
'.');
if (NULL != next_dot)
*next_dot = '\0';
/* If this is the first time this is called, make sure id is "$" */
if ( (NULL == prev) &&
(0 != strcmp (id,
"$")))
{
GNUNET_free (id);
GNUNET_free (next_path);
return GNUNET_SYSERR;
}
/* Check for bracketed indices */
if (NULL != bracket)
{
char *end_bracket = strchr (bracket,
']');
if (NULL == end_bracket)
{
GNUNET_free (id);
GNUNET_free (next_path);
return GNUNET_SYSERR;
}
*end_bracket = '\0';
*bracket = '\0';
bracket++;
json_t *array = json_object_get (obj,
next_id);
if (0 == strcmp (bracket,
"*"))
{
size_t index;
json_t *value;
int ret = GNUNET_OK;
json_array_foreach (array, index, value) {
ret = parse_path (value,
obj,
next_path,
cb,
cb_cls);
if (GNUNET_OK != ret)
{
GNUNET_free (id);
GNUNET_free (next_path);
return ret;
}
}
}
else
{
unsigned int index;
char dummy;
if (1 != sscanf (bracket,
"%u%c",
&index,
&dummy))
{
GNUNET_free (id);
GNUNET_free (next_path);
return GNUNET_SYSERR;
}
next_obj = json_array_get (array,
index);
}
}
else
{
/* No brackets, so just fetch the object by name */
next_obj = json_object_get (obj,
next_id);
}
if (NULL != next_obj)
{
int ret = parse_path (next_obj,
obj,
next_path,
cb,
cb_cls);
GNUNET_free (id);
GNUNET_free (next_path);
return ret;
}
GNUNET_free (id);
GNUNET_free (next_path);
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TALER_JSON_expand_path (json_t *json,
const char *path,
TALER_JSON_ExpandPathCallback cb,
void *cb_cls)
{
return parse_path (json,
NULL,
path,
cb,
cb_cls);
}
enum TALER_ErrorCode
TALER_JSON_get_error_code (const json_t *json)
{
const json_t *jc;
if (NULL == json)
return TALER_EC_GENERIC_INVALID_RESPONSE;
jc = json_object_get (json, "code");
/* The caller already knows that the JSON represents an error,
so we are dealing with a missing error code here. */
if (NULL == jc)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Expected Taler error code `code' in JSON, but field does not exist!\n");
return TALER_EC_INVALID;
}
if (json_is_integer (jc))
return (enum TALER_ErrorCode) json_integer_value (jc);
GNUNET_break_op (0);
return TALER_EC_INVALID;
}
const char *
TALER_JSON_get_error_hint (const json_t *json)
{
const json_t *jc;
if (NULL == json)
return NULL;
jc = json_object_get (json,
"hint");
if (NULL == jc)
return NULL; /* no hint, is allowed */
if (! json_is_string (jc))
{
/* Hints must be strings */
GNUNET_break_op (0);
return NULL;
}
return json_string_value (jc);
}
enum TALER_ErrorCode
TALER_JSON_get_error_code2 (const void *data,
size_t data_size)
{
json_t *json;
enum TALER_ErrorCode ec;
json_error_t err;
json = json_loadb (data,
data_size,
JSON_REJECT_DUPLICATES,
&err);
if (NULL == json)
return TALER_EC_INVALID;
ec = TALER_JSON_get_error_code (json);
json_decref (json);
if (ec == TALER_EC_NONE)
return TALER_EC_INVALID;
return ec;
}
void
TALER_deposit_extension_hash (const json_t *extensions,
struct TALER_ExtensionContractHash *ech)
{
GNUNET_assert (GNUNET_OK ==
dump_and_hash (extensions,
"taler-contract-extensions",
&ech->hash));
}
enum GNUNET_GenericReturnValue
TALER_JSON_extensions_config_hash (const json_t *config,
struct TALER_ExtensionConfigHash *ech)
{
return dump_and_hash (config,
"taler-extension-configuration",
&ech->hash);
}
/* End of json/json.c */
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