/*
This file is part of ANASTASIS
Copyright (C) 2014-2019 Anastasis SARL
ANASTASIS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1,
or (at your option) any later version.
ANASTASIS 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with ANASTASIS; see the file COPYING.LGPL. If not,
see
*/
/**
* @file restclient/anastasis_api_policy_lookup.c
* @brief Implementation of the /policy GET and POST
* @author Christian Grothoff
* @author Dennis Neufeld
* @author Dominik Meister
*/
#include "platform.h"
#include
#include
#include /* just for HTTP status codes */
#include "anastasis_service.h"
#include "anastasis_api_curl_defaults.h"
#include
/**
* @brief A Contract Operation Handle
*/
struct ANASTASIS_PolicyLookupOperation
{
/**
* The url for this request, including parameters.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Function to call with the result.
*/
ANASTASIS_PolicyLookupCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Reference to the execution context.
*/
struct GNUNET_CURL_Context *ctx;
/**
* Public key of the account we are downloading from.
*/
struct ANASTASIS_CRYPTO_AccountPublicKeyP account_pub;
/**
* Signature returned in the #ANASTASIS_HTTP_HEADER_POLICY_SIGNATURE
* header, or all zeros for none.
*/
struct ANASTASIS_AccountSignatureP account_sig;
/**
* Version of the policy.
*/
unsigned int version;
};
void
ANASTASIS_policy_lookup_cancel (struct ANASTASIS_PolicyLookupOperation *plo)
{
if (NULL != plo->job)
{
GNUNET_CURL_job_cancel (plo->job);
plo->job = NULL;
}
GNUNET_free (plo->url);
GNUNET_free (plo);
}
/**
* Process GET /policy response
*/
static void
handle_policy_lookup_finished (void *cls,
long response_code,
const void *data,
size_t data_size)
{
struct ANASTASIS_PolicyLookupOperation *plo = cls;
plo->job = NULL;
switch (response_code)
{
case 0:
/* Hard error */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Backend didn't even return from GET /policy\n");
break;
case MHD_HTTP_OK:
{
struct ANASTASIS_DownloadDetails dd;
struct ANASTASIS_UploadSignaturePS usp = {
.purpose.purpose = htonl (TALER_SIGNATURE_ANASTASIS_POLICY_UPLOAD),
.purpose.size = htonl (sizeof (usp)),
};
GNUNET_CRYPTO_hash (data,
data_size,
&usp.new_recovery_data_hash);
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_ANASTASIS_POLICY_UPLOAD,
&usp,
&plo->account_sig.eddsa_sig,
&plo->account_pub.pub))
{
GNUNET_break_op (0);
response_code = 0;
break;
}
/* Success, call callback with all details! */
memset (&dd, 0, sizeof (dd));
dd.sig = plo->account_sig;
dd.curr_policy_hash = usp.new_recovery_data_hash;
dd.policy = data;
dd.policy_size = data_size;
dd.version = plo->version;
plo->cb (plo->cb_cls,
response_code,
&dd);
plo->cb = NULL;
ANASTASIS_policy_lookup_cancel (plo);
return;
}
case MHD_HTTP_BAD_REQUEST:
/* This should never happen, either us or the anastasis server is buggy
(or API version conflict); just pass JSON reply to the application */
break;
case MHD_HTTP_NOT_FOUND:
/* Nothing really to verify */
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
/* Server had an internal issue; we should retry, but this API
leaves this to the application */
break;
default:
/* unexpected response code */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected response code %u\n",
(unsigned int) response_code);
GNUNET_break (0);
response_code = 0;
break;
}
plo->cb (plo->cb_cls,
response_code,
NULL);
plo->cb = NULL;
ANASTASIS_policy_lookup_cancel (plo);
}
/**
* Handle HTTP header received by curl.
*
* @param buffer one line of HTTP header data
* @param size size of an item
* @param nitems number of items passed
* @param userdata our `struct ANASTASIS_PolicyLookupOperation *`
* @return `size * nitems`
*/
static size_t
handle_header (char *buffer,
size_t size,
size_t nitems,
void *userdata)
{
struct ANASTASIS_PolicyLookupOperation *plo = userdata;
size_t total = size * nitems;
char *ndup;
const char *hdr_type;
char *hdr_val;
char *sp;
ndup = GNUNET_strndup (buffer,
total);
hdr_type = strtok_r (ndup,
":",
&sp);
if (NULL == hdr_type)
{
GNUNET_free (ndup);
return total;
}
hdr_val = strtok_r (NULL,
"\n\r",
&sp);
if (NULL == hdr_val)
{
GNUNET_free (ndup);
return total;
}
if (' ' == *hdr_val)
hdr_val++;
if (0 == strcasecmp (hdr_type,
ANASTASIS_HTTP_HEADER_POLICY_SIGNATURE))
{
if (GNUNET_OK !=
GNUNET_STRINGS_string_to_data (
hdr_val,
strlen (hdr_val),
&plo->account_sig,
sizeof (struct ANASTASIS_AccountSignatureP)))
{
GNUNET_break_op (0);
GNUNET_free (ndup);
return 0;
}
}
if (0 == strcasecmp (hdr_type,
ANASTASIS_HTTP_HEADER_POLICY_VERSION))
{
char dummy;
if (1 !=
sscanf (hdr_val,
"%u%c",
&plo->version,
&dummy))
{
GNUNET_break_op (0);
GNUNET_free (ndup);
return 0;
}
}
GNUNET_free (ndup);
return total;
}
struct ANASTASIS_PolicyLookupOperation *
ANASTASIS_policy_lookup (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const struct ANASTASIS_CRYPTO_AccountPublicKeyP *anastasis_pub,
ANASTASIS_PolicyLookupCallback cb,
void *cb_cls)
{
struct ANASTASIS_PolicyLookupOperation *plo;
CURL *eh;
char *acc_pub_str;
char *path;
GNUNET_assert (NULL != cb);
plo = GNUNET_new (struct ANASTASIS_PolicyLookupOperation);
plo->account_pub = *anastasis_pub;
acc_pub_str = GNUNET_STRINGS_data_to_string_alloc (anastasis_pub,
sizeof (*anastasis_pub));
GNUNET_asprintf (&path,
"policy/%s",
acc_pub_str);
GNUNET_free (acc_pub_str);
plo->url = TALER_url_join (backend_url,
path,
NULL);
GNUNET_free (path);
eh = ANASTASIS_curl_easy_get_ (plo->url);
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_HEADERFUNCTION,
&handle_header));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_HEADERDATA,
plo));
plo->cb = cb;
plo->cb_cls = cb_cls;
plo->job = GNUNET_CURL_job_add_raw (ctx,
eh,
NULL,
&handle_policy_lookup_finished,
plo);
return plo;
}
struct ANASTASIS_PolicyLookupOperation *
ANASTASIS_policy_lookup_version (
struct GNUNET_CURL_Context *ctx,
const char *backend_url,
const struct ANASTASIS_CRYPTO_AccountPublicKeyP *anastasis_pub,
ANASTASIS_PolicyLookupCallback cb,
void *cb_cls,
unsigned int version)
{
struct ANASTASIS_PolicyLookupOperation *plo;
CURL *eh;
char *acc_pub_str;
char *path;
char version_s[14];
GNUNET_assert (NULL != cb);
plo = GNUNET_new (struct ANASTASIS_PolicyLookupOperation);
plo->account_pub = *anastasis_pub;
acc_pub_str = GNUNET_STRINGS_data_to_string_alloc (anastasis_pub,
sizeof (*anastasis_pub));
GNUNET_asprintf (&path,
"policy/%s",
acc_pub_str);
GNUNET_free (acc_pub_str);
GNUNET_snprintf (version_s,
sizeof (version_s),
"%u",
version);
plo->url = TALER_url_join (backend_url,
path,
"version",
version_s,
NULL);
GNUNET_free (path);
eh = ANASTASIS_curl_easy_get_ (plo->url);
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_HEADERFUNCTION,
&handle_header));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_HEADERDATA,
plo));
plo->cb = cb;
plo->cb_cls = cb_cls;
plo->job = GNUNET_CURL_job_add_raw (ctx,
eh,
NULL,
&handle_policy_lookup_finished,
plo);
return plo;
}