diff options
Diffstat (limited to 'src/mint-lib/mint_api_wire.c')
| -rw-r--r-- | src/mint-lib/mint_api_wire.c | 620 |
1 files changed, 0 insertions, 620 deletions
diff --git a/src/mint-lib/mint_api_wire.c b/src/mint-lib/mint_api_wire.c deleted file mode 100644 index 0947354ad..000000000 --- a/src/mint-lib/mint_api_wire.c +++ /dev/null @@ -1,620 +0,0 @@ -/* - This file is part of TALER - Copyright (C) 2014, 2015 GNUnet e.V. - - 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, If not, see - <http://www.gnu.org/licenses/> -*/ -/** - * @file mint-lib/mint_api_wire.c - * @brief Implementation of the /wire request of the mint's HTTP API - * @author Christian Grothoff - */ -#include "platform.h" -#include <curl/curl.h> -#include <jansson.h> -#include <microhttpd.h> /* just for HTTP status codes */ -#include <gnunet/gnunet_util_lib.h> -#include "taler_mint_service.h" -#include "mint_api_common.h" -#include "mint_api_json.h" -#include "mint_api_context.h" -#include "mint_api_handle.h" -#include "taler_signatures.h" - - -/** - * @brief A Wire Handle - */ -struct TALER_MINT_WireHandle -{ - - /** - * The connection to mint this request handle will use - */ - struct TALER_MINT_Handle *mint; - - /** - * The url for this request. - */ - char *url; - - /** - * Handle for the request. - */ - struct MAC_Job *job; - - /** - * Function to call with the result. - */ - TALER_MINT_WireResultCallback cb; - - /** - * Closure for @a cb. - */ - void *cb_cls; - - /** - * Download buffer - */ - struct MAC_DownloadBuffer db; - - /** - * Set to the "methods" JSON array returned by the - * /wire request. - */ - json_t *methods; - - /** - * Current iteration offset in the @e methods array. - */ - unsigned int methods_off; - -}; - - -/** - * Verify that the signature on the "200 OK" response - * for /wire/sepa from the mint is valid. - * - * @param wh wire handle - * @param json json reply with the signature - * @return #GNUNET_SYSERR if @a json is invalid, - * #GNUNET_NO if the method is unknown, - * #GNUNET_OK if the json is valid - */ -static int -verify_wire_sepa_signature_ok (const struct TALER_MINT_WireHandle *wh, - json_t *json) -{ - struct TALER_MasterSignatureP mint_sig; - struct TALER_MasterWireSepaDetailsPS mp; - const char *receiver_name; - const char *iban; - const char *bic; - const struct TALER_MINT_Keys *key_state; - struct GNUNET_HashContext *hc; - struct MAJ_Specification spec[] = { - MAJ_spec_fixed_auto ("sig", &mint_sig), - MAJ_spec_string ("receiver_name", &receiver_name), - MAJ_spec_string ("iban", &iban), - MAJ_spec_string ("bic", &bic), - MAJ_spec_end - }; - - if (GNUNET_OK != - MAJ_parse_json (json, - spec)) - { - GNUNET_break_op (0); - return GNUNET_SYSERR; - } - - key_state = TALER_MINT_get_keys (wh->mint); - mp.purpose.purpose = htonl (TALER_SIGNATURE_MASTER_SEPA_DETAILS); - mp.purpose.size = htonl (sizeof (struct TALER_MasterWireSepaDetailsPS)); - hc = GNUNET_CRYPTO_hash_context_start (); - GNUNET_CRYPTO_hash_context_read (hc, - receiver_name, - strlen (receiver_name) + 1); - GNUNET_CRYPTO_hash_context_read (hc, - iban, - strlen (iban) + 1); - GNUNET_CRYPTO_hash_context_read (hc, - bic, - strlen (bic) + 1); - GNUNET_CRYPTO_hash_context_finish (hc, - &mp.h_sepa_details); - - if (GNUNET_OK != - GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MASTER_SEPA_DETAILS, - &mp.purpose, - &mint_sig.eddsa_signature, - &key_state->master_pub.eddsa_pub)) - { - GNUNET_break_op (0); - MAJ_parse_free (spec); - return GNUNET_SYSERR; - } - MAJ_parse_free (spec); - return GNUNET_OK; -} - - -/** - * Verify that the signature on the "200 OK" response - * for /wire/METHOD from the mint is valid. - * - * @param wh wire handle with key material - * @param method method to verify the reply for - * @param json json reply with the signature - * @return #GNUNET_SYSERR if @a json is invalid, - * #GNUNET_NO if the method is unknown, - * #GNUNET_OK if the json is valid - */ -static int -verify_wire_method_signature_ok (const struct TALER_MINT_WireHandle *wh, - const char *method, - json_t *json) -{ - struct - { - /** - * Name fo the method. - */ - const char *method; - - /** - * Handler to invoke to verify signature. - * - * @param wh wire handle with key material - * @param json json reply with signature to verify - */ - int (*handler)(const struct TALER_MINT_WireHandle *wh, - json_t *json); - } handlers[] = { - { "sepa", &verify_wire_sepa_signature_ok }, - { NULL, NULL } - }; - unsigned int i; - - for (i=0;NULL != handlers[i].method; i++) - if (0 == strcasecmp (handlers[i].method, - method)) - return handlers[i].handler (wh, - json); - GNUNET_log (GNUNET_ERROR_TYPE_INFO, - "Wire transfer method `%s' not supported\n", - method); - return GNUNET_NO; -} - - -/** - * Perform the next /wire/method request or signal - * the end of the iteration. - * - * @param wh the wire handle - * @return a handle for this request - */ -static void -request_wire_method (struct TALER_MINT_WireHandle *wh); - - -/** - * Function called when we're done processing the - * HTTP /wire/METHOD request. - * - * @param cls the `struct TALER_MINT_WireHandle` - * @param eh the curl request handle - */ -static void -handle_wire_method_finished (void *cls, - CURL *eh) -{ - struct TALER_MINT_WireHandle *wh = cls; - long response_code; - json_t *json; - - wh->job = NULL; - json = MAC_download_get_result (&wh->db, - eh, - &response_code); - switch (response_code) - { - case 0: - break; - case MHD_HTTP_OK: - { - const char *method; - - method = json_string_value (json_array_get (wh->methods, - wh->methods_off - 1)); - if (GNUNET_OK != - verify_wire_method_signature_ok (wh, - method, - json)) - { - GNUNET_break_op (0); - response_code = 0; - break; - } - break; - } - case MHD_HTTP_FOUND: - /* /wire/test returns a 302 redirect, we should just give - this information back to the callback below */ - break; - case MHD_HTTP_BAD_REQUEST: - /* This should never happen, either us or the mint is buggy - (or API version conflict); just pass JSON reply to the application */ - break; - case MHD_HTTP_NOT_FOUND: - /* Nothing really to verify, this should never - happen, we should pass the JSON reply to the application */ - 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", - response_code); - GNUNET_break (0); - response_code = 0; - break; - } - if (0 == response_code) - { - /* signal end of iteration */ - wh->cb (wh->cb_cls, - 0, - NULL, - NULL); - json_decref (json); - TALER_MINT_wire_cancel (wh); - return; - } - /* pass on successful reply */ - wh->cb (wh->cb_cls, - response_code, - json_string_value (json_array_get (wh->methods, - wh->methods_off-1)), - json); - /* trigger request for the next /wire/method */ - request_wire_method (wh); -} - - -/** - * Perform the next /wire/method request or signal - * the end of the iteration. - * - * @param wh the wire handle - * @return a handle for this request - */ -static void -request_wire_method (struct TALER_MINT_WireHandle *wh) -{ - struct TALER_MINT_Context *ctx; - CURL *eh; - char *path; - - if (json_array_size (wh->methods) <= wh->methods_off) - { - /* we are done, signal end of iteration */ - wh->cb (wh->cb_cls, - 0, - NULL, - NULL); - TALER_MINT_wire_cancel (wh); - return; - } - GNUNET_free_non_null (wh->db.buf); - wh->db.buf = NULL; - wh->db.buf_size = 0; - wh->db.eno = 0; - GNUNET_free_non_null (wh->url); - GNUNET_asprintf (&path, - "/wire/%s", - json_string_value (json_array_get (wh->methods, - wh->methods_off++))); - wh->url = MAH_path_to_url (wh->mint, - path); - GNUNET_free (path); - - eh = curl_easy_init (); - GNUNET_assert (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_URL, - wh->url)); - GNUNET_assert (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_WRITEFUNCTION, - &MAC_download_cb)); - GNUNET_assert (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_WRITEDATA, - &wh->db)); - /* The default is 'disabled', but let's be sure */ - GNUNET_assert (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_FOLLOWLOCATION, - (long) 0)); - ctx = MAH_handle_to_context (wh->mint); - wh->job = MAC_job_add (ctx, - eh, - GNUNET_YES, - &handle_wire_method_finished, - wh); - TALER_MINT_perform (ctx); -} - - -/** - * Verify that the signature on the "200 OK" response - * for /wire from the mint is valid. - * - * @param wh wire handle - * @param json json reply with the signature - * @return NULL if @a json is invalid, otherwise the - * "methods" array (with an RC of 1) - */ -static json_t * -verify_wire_signature_ok (const struct TALER_MINT_WireHandle *wh, - json_t *json) -{ - struct TALER_MintSignatureP mint_sig; - struct TALER_MintPublicKeyP mint_pub; - struct TALER_MintWireSupportMethodsPS mp; - json_t *methods; - const struct TALER_MINT_Keys *key_state; - struct GNUNET_HashContext *hc; - struct MAJ_Specification spec[] = { - MAJ_spec_fixed_auto ("sig", &mint_sig), - MAJ_spec_fixed_auto ("pub", &mint_pub), - MAJ_spec_json ("methods", &methods), - MAJ_spec_end - }; - unsigned int i; - - if (GNUNET_OK != - MAJ_parse_json (json, - spec)) - { - GNUNET_break_op (0); - return NULL; - } - if (! json_is_array (methods)) - { - GNUNET_break_op (0); - MAJ_parse_free (spec); - return NULL; - } - - key_state = TALER_MINT_get_keys (wh->mint); - if (GNUNET_OK != - TALER_MINT_test_signing_key (key_state, - &mint_pub)) - { - GNUNET_break_op (0); - return NULL; - } - hc = GNUNET_CRYPTO_hash_context_start (); - for (i=0;i<json_array_size (methods);i++) - { - const json_t *element = json_array_get (methods, i); - const char *method; - - if (! json_is_string (element)) - { - GNUNET_CRYPTO_hash_context_abort (hc); - GNUNET_break_op (0); - MAJ_parse_free (spec); - return NULL; - } - method = json_string_value (element); - GNUNET_CRYPTO_hash_context_read (hc, - method, - strlen (method) + 1); - } - mp.purpose.purpose = htonl (TALER_SIGNATURE_MINT_WIRE_TYPES); - mp.purpose.size = htonl (sizeof (struct TALER_MintWireSupportMethodsPS)); - GNUNET_CRYPTO_hash_context_finish (hc, - &mp.h_wire_types); - - if (GNUNET_OK != - GNUNET_CRYPTO_eddsa_verify (TALER_SIGNATURE_MINT_WIRE_TYPES, - &mp.purpose, - &mint_sig.eddsa_signature, - &mint_pub.eddsa_pub)) - { - GNUNET_break_op (0); - MAJ_parse_free (spec); - return NULL; - } - return methods; -} - - -/** - * Function called when we're done processing the - * HTTP /wire request. - * - * @param cls the `struct TALER_MINT_WireHandle` - * @param eh the curl request handle - */ -static void -handle_wire_finished (void *cls, - CURL *eh) -{ - struct TALER_MINT_WireHandle *wh = cls; - long response_code; - json_t *json; - - wh->job = NULL; - json = MAC_download_get_result (&wh->db, - eh, - &response_code); - switch (response_code) - { - case 0: - break; - case MHD_HTTP_OK: - { - json_t *methods; - - if (NULL == - (methods = verify_wire_signature_ok (wh, - json))) - { - GNUNET_break_op (0); - response_code = 0; - break; - } - wh->methods = methods; - request_wire_method (wh); - return; - } - break; - case MHD_HTTP_BAD_REQUEST: - /* This should never happen, either us or the mint is buggy - (or API version conflict); just pass JSON reply to the application */ - break; - case MHD_HTTP_NOT_FOUND: - /* Nothing really to verify, this should never - happen, we should pass the JSON reply to the application */ - 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", - response_code); - GNUNET_break (0); - response_code = 0; - break; - } - if (0 != response_code) - { - /* pass on successful reply */ - wh->cb (wh->cb_cls, - response_code, - NULL, - json); - } - /* signal end of iteration */ - wh->cb (wh->cb_cls, - 0, - NULL, - NULL); - if (NULL != json) - json_decref (json); - TALER_MINT_wire_cancel (wh); -} - - -/** - * Obtain information about a mint's wire instructions. - * A mint may provide wire instructions for creating - * a reserve. The wire instructions also indicate - * which wire formats merchants may use with the mint. - * This API is typically used by a wallet for wiring - * funds, and possibly by a merchant to determine - * supported wire formats. - * - * Note that while we return the (main) response verbatim to the - * caller for further processing, we do already verify that the - * response is well-formed (i.e. that signatures included in the - * response are all valid). If the mint's reply is not well-formed, - * we return an HTTP status code of zero to @a cb. - * - * @param mint the mint handle; the mint must be ready to operate - * @param wire_cb the callback to call when a reply for this request is available - * @param wire_cb_cls closure for the above callback - * @return a handle for this request - */ -struct TALER_MINT_WireHandle * -TALER_MINT_wire (struct TALER_MINT_Handle *mint, - TALER_MINT_WireResultCallback wire_cb, - void *wire_cb_cls) -{ - struct TALER_MINT_WireHandle *wh; - struct TALER_MINT_Context *ctx; - CURL *eh; - - if (GNUNET_YES != - MAH_handle_is_ready (mint)) - { - GNUNET_break (0); - return NULL; - } - wh = GNUNET_new (struct TALER_MINT_WireHandle); - wh->mint = mint; - wh->cb = wire_cb; - wh->cb_cls = wire_cb_cls; - wh->url = MAH_path_to_url (mint, "/wire"); - - eh = curl_easy_init (); - GNUNET_assert (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_URL, - wh->url)); - GNUNET_assert (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_WRITEFUNCTION, - &MAC_download_cb)); - GNUNET_assert (CURLE_OK == - curl_easy_setopt (eh, - CURLOPT_WRITEDATA, - &wh->db)); - ctx = MAH_handle_to_context (mint); - wh->job = MAC_job_add (ctx, - eh, - GNUNET_YES, - &handle_wire_finished, - wh); - return wh; -} - - -/** - * Cancel a wire information request. This function cannot be used - * on a request handle if a response is already served for it. - * - * @param wh the wire information request handle - */ -void -TALER_MINT_wire_cancel (struct TALER_MINT_WireHandle *wh) -{ - if (NULL != wh->job) - { - MAC_job_cancel (wh->job); - wh->job = NULL; - } - if (NULL != wh->methods) - { - json_decref (wh->methods); - wh->methods = NULL; - } - GNUNET_free_non_null (wh->db.buf); - GNUNET_free (wh->url); - GNUNET_free (wh); -} - - -/* end of mint_api_wire.c */ |