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exchange/src/kyclogic/plugin_kyclogic_persona.c

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-first sketch of persona kyclogic
2022-08-17 21:35:30 +02:00
/*
This file is part of GNU Taler
Copyright (C) 2022 Taler Systems SA
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.GPL. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file plugin_kyclogic_persona.c
* @brief persona for an authentication flow logic
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_kyclogic_plugin.h"
#include "taler_mhd_lib.h"
#include "taler_curl_lib.h"
#include "taler_json_lib.h"
#include <regex.h>
#include "taler_util.h"
/**
* Which version of the persona API are we implementing?
*/
#define PERSONA_VERSION "2021-07-05"
/**
* Saves the state of a plugin.
*/
struct PluginState
{
/**
* Our base URL.
*/
char *exchange_base_url;
/**
* Our global configuration.
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Context for CURL operations (useful to the event loop)
*/
struct GNUNET_CURL_Context *curl_ctx;
/**
* Context for integrating @e curl_ctx with the
* GNUnet event loop.
*/
struct GNUNET_CURL_RescheduleContext *curl_rc;
};
/**
* Keeps the plugin-specific state for
* a given configuration section.
*/
struct TALER_KYCLOGIC_ProviderDetails
{
/**
* Overall plugin state.
*/
struct PluginState *ps;
/**
* Configuration section that configured us.
*/
char *section;
/**
* Authorization token to use when talking
* to the service.
*/
char *auth_token;
/**
* Template ID for the KYC check to perform.
*/
char *template_id;
/**
* Subdomain to use.
*/
char *subdomain;
/**
* Where to redirect the client upon completion.
*/
char *post_kyc_redirect_url;
/**
* Validity time for a successful KYC process.
*/
struct GNUNET_TIME_Relative validity;
/**
* Curl-ready authentication header to use.
*/
struct curl_slist *slist;
};
/**
* Handle for an initiation operation.
*/
struct TALER_KYCLOGIC_InitiateHandle
{
/**
* Hash of the payto:// URI we are initiating the KYC for.
*/
struct TALER_PaytoHashP h_payto;
/**
* UUID being checked.
*/
uint64_t legitimization_uuid;
/**
* Our configuration details.
*/
const struct TALER_KYCLOGIC_ProviderDetails *pd;
/**
* Continuation to call.
*/
TALER_KYCLOGIC_InitiateCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Context for #TEH_curl_easy_post(). Keeps the data that must
* persist for Curl to make the upload.
*/
struct TALER_CURL_PostContext ctx;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* URL of the cURL request.
*/
char *url;
};
/**
* Handle for an KYC proof operation.
*/
struct TALER_KYCLOGIC_ProofHandle
{
/**
* Overall plugin state.
*/
struct PluginState *ps;
/**
* Our configuration details.
*/
const struct TALER_KYCLOGIC_ProviderDetails *pd;
/**
* Continuation to call.
*/
TALER_KYCLOGIC_ProofCallback cb;
/**
* Closure for @e cb.
*/
void *cb_cls;
/**
* Connection we are handling.
*/
struct MHD_Connection *connection;
/**
* Task for asynchronous execution.
*/
struct GNUNET_SCHEDULER_Task *task;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* URL of the cURL request.
*/
char *url;
/**
* Hash of the payto:// URI we are checking the KYC for.
*/
struct TALER_PaytoHashP h_payto;
/**
* UUID being checked.
*/
uint64_t legitimization_uuid;
/**
* Account ID at the provider.
*/
char *provider_user_id;
/**
* Inquiry ID at the provider.
*/
char *provider_legitimization_id;
};
/**
* Handle for an KYC Web hook operation.
*/
struct TALER_KYCLOGIC_WebhookHandle
{
/**
* Continuation to call when done.
*/
TALER_KYCLOGIC_WebhookCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Task for asynchronous execution.
*/
struct GNUNET_SCHEDULER_Task *task;
/**
* Overall plugin state.
*/
struct PluginState *ps;
/**
* Our configuration details.
*/
const struct TALER_KYCLOGIC_ProviderDetails *pd;
/**
* Connection we are handling.
*/
struct MHD_Connection *connection;
/**
* Verification ID from the service.
*/
char *inquiry_id;
/**
* URL of the cURL request.
*/
char *url;
/**
* Handle for the request.
*/
struct GNUNET_CURL_Job *job;
/**
* Response to return asynchronously.
*/
struct MHD_Response *resp;
/**
* Our account ID.
*/
struct TALER_PaytoHashP h_payto;
/**
* Row in legitimizations for the given
* @e verification_id.
*/
uint64_t legi_row;
/**
* HTTP response code to return asynchronously.
*/
unsigned int response_code;
};
/**
* Release configuration resources previously loaded
*
* @param[in] pd configuration to release
*/
static void
persona_unload_configuration (struct TALER_KYCLOGIC_ProviderDetails *pd)
{
curl_slist_free_all (pd->slist);
GNUNET_free (pd->auth_token);
GNUNET_free (pd->template_id);
GNUNET_free (pd->section);
GNUNET_free (pd->post_kyc_redirect_url);
GNUNET_free (pd);
}
/**
* Load the configuration of the KYC provider.
*
* @param cls closure
* @param provider_section_name configuration section to parse
* @return NULL if configuration is invalid
*/
static struct TALER_KYCLOGIC_ProviderDetails *
persona_load_configuration (void *cls,
const char *provider_section_name)
{
struct PluginState *ps = cls;
struct TALER_KYCLOGIC_ProviderDetails *pd;
pd = GNUNET_new (struct TALER_KYCLOGIC_ProviderDetails);
pd->ps = ps;
pd->section = GNUNET_strdup (provider_section_name);
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_time (ps->cfg,
provider_section_name,
"PERSONA_VALIDITY",
&pd->validity))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
provider_section_name,
"PERSONA_VALIDITY");
persona_unload_configuration (pd);
return NULL;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (ps->cfg,
provider_section_name,
"PERSONA_AUTH_TOKEN",
&pd->auth_token))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
provider_section_name,
"PERSONA_AUTH_TOKEN");
persona_unload_configuration (pd);
return NULL;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (ps->cfg,
provider_section_name,
"PERSONA_SUBDOMAIN",
&pd->subdomain))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
provider_section_name,
"PERSONA_SUBDOMAIN");
persona_unload_configuration (pd);
return NULL;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (ps->cfg,
provider_section_name,
"KYC_POST_URL",
&pd->post_kyc_redirect_url))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
provider_section_name,
"KYC_POST_URL");
persona_unload_configuration (pd);
return NULL;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (ps->cfg,
provider_section_name,
"PERSONA_TEMPLATE_ID",
&pd->template_id))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
provider_section_name,
"PERSONA_TEMPLATE_ID");
persona_unload_configuration (pd);
return NULL;
}
{
char *auth;
GNUNET_asprintf (&auth,
"%s: Bearer %s",
MHD_HTTP_HEADER_AUTHORIZATION,
pd->auth_token);
pd->slist = curl_slist_append (NULL,
auth);
GNUNET_free (auth);
GNUNET_asprintf (&auth,
"%s: %s",
MHD_HTTP_HEADER_ACCEPT,
"application/json");
pd->slist = curl_slist_append (pd->slist,
"Persona-Version: "
PERSONA_VERSION);
GNUNET_free (auth);
}
return pd;
}
/**
* Cancel KYC check initiation.
*
* @param[in] ih handle of operation to cancel
*/
static void
persona_initiate_cancel (struct TALER_KYCLOGIC_InitiateHandle *ih)
{
if (NULL != ih->job)
{
GNUNET_CURL_job_cancel (ih->job);
ih->job = NULL;
}
GNUNET_free (ih->url);
GNUNET_free (ih);
}
/**
* Function called when we're done processing the
* HTTP POST "/api/v1/inquiries" request.
*
* @param cls the `struct TALER_KYCLOGIC_InitiateHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_initiate_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_KYCLOGIC_InitiateHandle *ih = cls;
const struct TALER_KYCLOGIC_ProviderDetails *pd = ih->pd;
const json_t *j = response;
char *url;
json_t *data;
const char *type;
const char *inquiry_id;
const char *persona_account_id;
const char *ename;
unsigned int eline;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("type",
&type),
GNUNET_JSON_spec_string ("id",
&inquiry_id),
GNUNET_JSON_spec_end ()
};
ih->job = NULL;
switch (response_code)
{
case MHD_HTTP_CREATED:
/* handled below */
break;
case MHD_HTTP_UNAUTHORIZED:
case MHD_HTTP_FORBIDDEN:
{
const char *msg;
msg = json_string_value (
json_object_get (
json_array_get (
json_object_get (j,
"errors"),
0),
"title"));
ih->cb (ih->cb_cls,
TALER_EC_EXCHANGE_KYC_CHECK_AUTHORIZATION_FAILED,
NULL,
NULL,
NULL,
msg);
persona_initiate_cancel (ih);
return;
}
case MHD_HTTP_NOT_FOUND:
case MHD_HTTP_CONFLICT:
{
const char *msg;
msg = json_string_value (
json_object_get (
json_array_get (
json_object_get (j,
"errors"),
0),
"title"));
ih->cb (ih->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_PROVIDER_UNEXPECTED_REPLY,
NULL,
NULL,
NULL,
msg);
persona_initiate_cancel (ih);
return;
}
default:
{
char *err;
GNUNET_break_op (0);
json_dumpf (j,
stderr,
JSON_INDENT (2));
GNUNET_asprintf (&err,
"Unexpected HTTP status %u from Persona\n",
(unsigned int) response_code);
ih->cb (ih->cb_cls,
TALER_EC_NONE,
NULL,
NULL,
NULL,
err);
GNUNET_free (err);
persona_initiate_cancel (ih);
return;
}
}
data = json_object_get (j,
"data");
if (NULL == data)
{
GNUNET_break_op (0);
json_dumpf (j,
stderr,
JSON_INDENT (2));
persona_initiate_cancel (ih);
return;
}
if (GNUNET_OK !=
GNUNET_JSON_parse (data,
spec,
&ename,
&eline))
{
GNUNET_break_op (0);
json_dumpf (j,
stderr,
JSON_INDENT (2));
ih->cb (ih->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_PROVIDER_UNEXPECTED_REPLY,
NULL,
NULL,
NULL,
ename);
persona_initiate_cancel (ih);
return;
}
persona_account_id
= json_string_value (
json_object_get (
json_object_get (
json_object_get (
json_object_get (data,
"relationships"),
"account"),
"data"),
"id"));
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Starting inquiry %s for Persona account %s\n",
inquiry_id,
persona_account_id);
GNUNET_asprintf (&url,
"https://%s.withpersona.com/verify"
"?inquiry-id=%s",
pd->subdomain,
inquiry_id);
ih->cb (ih->cb_cls,
TALER_EC_NONE,
url,
persona_account_id,
inquiry_id,
NULL);
GNUNET_free (url);
persona_initiate_cancel (ih);
}
/**
* Initiate KYC check.
*
* @param cls the @e cls of this struct with the plugin-specific state
* @param pd provider configuration details
* @param account_id which account to trigger process for
* @param legitimization_uuid unique ID for the legitimization process
* @param cb function to call with the result
* @param cb_cls closure for @a cb
* @return handle to cancel operation early
*/
static struct TALER_KYCLOGIC_InitiateHandle *
persona_initiate (void *cls,
const struct TALER_KYCLOGIC_ProviderDetails *pd,
const struct TALER_PaytoHashP *account_id,
uint64_t legitimization_uuid,
TALER_KYCLOGIC_InitiateCallback cb,
void *cb_cls)
{
struct PluginState *ps = cls;
struct TALER_KYCLOGIC_InitiateHandle *ih;
json_t *body;
CURL *eh;
eh = curl_easy_init ();
if (NULL == eh)
{
GNUNET_break (0);
return NULL;
}
ih = GNUNET_new (struct TALER_KYCLOGIC_InitiateHandle);
ih->legitimization_uuid = legitimization_uuid;
ih->cb = cb;
ih->cb_cls = cb_cls;
ih->h_payto = *account_id;
ih->pd = pd;
GNUNET_asprintf (&ih->url,
"https://withpersona.com/api/v1/inquiries");
{
char *payto_s;
char *proof_url;
char ref_s[24];
GNUNET_snprintf (ref_s,
sizeof (ref_s),
"%llu",
(unsigned long long) ih->legitimization_uuid);
payto_s = GNUNET_STRINGS_data_to_string_alloc (&ih->h_payto,
sizeof (ih->h_payto));
GNUNET_asprintf (&proof_url,
"%s/kyc-proof/%s/%s",
pd->ps->exchange_base_url,
payto_s,
pd->section);
body = GNUNET_JSON_PACK (
GNUNET_JSON_pack_string ("inquiry_template_id",
pd->template_id),
GNUNET_JSON_pack_string ("account_id",
payto_s),
GNUNET_JSON_pack_string ("reference_id",
ref_s),
GNUNET_JSON_pack_string ("redirect_uri",
proof_url)
);
GNUNET_free (payto_s);
GNUNET_free (proof_url);
}
GNUNET_break (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_VERBOSE,
1));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_MAXREDIRS,
1L));
GNUNET_break (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
ih->url));
if (GNUNET_OK !=
TALER_curl_easy_post (&ih->ctx,
eh,
body))
{
GNUNET_break (0);
GNUNET_free (ih->url);
GNUNET_free (ih);
curl_easy_cleanup (eh);
json_decref (body);
return NULL;
}
ih->job = GNUNET_CURL_job_add2 (ps->curl_ctx,
eh,
ih->ctx.headers,
&handle_initiate_finished,
ih);
GNUNET_CURL_extend_headers (ih->job,
pd->slist);
return ih;
}
/**
* Cancel KYC proof.
*
* @param[in] ph handle of operation to cancel
*/
static void
persona_proof_cancel (struct TALER_KYCLOGIC_ProofHandle *ph)
{
if (NULL != ph->job)
{
GNUNET_CURL_job_cancel (ph->job);
ph->job = NULL;
}
GNUNET_free (ph->url);
GNUNET_free (ph->provider_user_id);
GNUNET_free (ph->provider_legitimization_id);
GNUNET_free (ph);
}
/**
* Function called when we're done processing the
* HTTP "/api/v1/verifications/{verification-id}" request.
*
* @param cls the `struct TALER_KYCLOGIC_InitiateHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_proof_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_KYCLOGIC_ProofHandle *ph = cls;
const json_t *j = response;
ph->job = NULL;
json_dumpf (j,
stderr,
JSON_INDENT (2));
#if 0
switch (response_code)
{
case MHD_HTTP_OK:
{
const char *verification_id;
const char *form_url;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("verification_id",
&verification_id),
GNUNET_JSON_spec_string ("form_url",
&form_url),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
json_dumpf (j,
stderr,
JSON_INDENT (2));
ph->cb (ph->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_PROVIDER_UNEXPECTED_REPLY,
NULL,
NULL,
NULL,
json_string_value (json_object_get (j,
"type")));
break;
}
ph->cb (ph->cb_cls,
TALER_EC_NONE,
form_url,
NULL, /* no provider_user_id */
verification_id,
NULL /* no error */);
GNUNET_JSON_parse_free (spec);
}
break;
case MHD_HTTP_BAD_REQUEST:
case MHD_HTTP_NOT_FOUND:
case MHD_HTTP_CONFLICT:
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"PERSONA failed with response %u:\n",
(unsigned int) response_code);
json_dumpf (j,
stderr,
JSON_INDENT (2));
ph->cb (ph->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_LOGIC_BUG,
NULL,
NULL,
NULL,
json_string_value (json_object_get (j,
"type")));
break;
case MHD_HTTP_UNAUTHORIZED:
case MHD_HTTP_PAYMENT_REQUIRED:
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Refused access with HTTP status code %u\n",
(unsigned int) response_code);
ph->cb (ph->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_PROVIDER_ACCESS_REFUSED,
NULL,
NULL,
NULL,
json_string_value (json_object_get (j,
"type")));
break;
case MHD_HTTP_REQUEST_TIMEOUT:
ph->cb (ph->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_PROVIDER_TIMEOUT,
NULL,
NULL,
NULL,
json_string_value (json_object_get (j,
"type")));
break;
case MHD_HTTP_UNPROCESSABLE_ENTITY: /* validation */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"PERSONA failed with response %u:\n",
(unsigned int) response_code);
json_dumpf (j,
stderr,
JSON_INDENT (2));
ph->cb (ph->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_PROVIDER_UNEXPECTED_REPLY,
NULL,
NULL,
NULL,
json_string_value (json_object_get (j,
"type")));
break;
case MHD_HTTP_TOO_MANY_REQUESTS:
ph->cb (ph->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_PROVIDER_RATE_LIMIT_EXCEEDED,
NULL,
NULL,
NULL,
json_string_value (json_object_get (j,
"type")));
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
ph->cb (ph->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_PROVIDER_UNEXPECTED_REPLY,
NULL,
NULL,
NULL,
json_string_value (json_object_get (j,
"type")));
break;
default:
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected PERSONA response %u:\n",
(unsigned int) response_code);
json_dumpf (j,
stderr,
JSON_INDENT (2));
ph->cb (ph->cb_cls,
TALER_EC_EXCHANGE_KYC_GENERIC_PROVIDER_UNEXPECTED_REPLY,
NULL,
NULL,
NULL,
json_string_value (json_object_get (j,
"type")));
break;
}
#endif
persona_proof_cancel (ph);
}
/**
* Check KYC status and return final result to human.
*
* @param cls the @e cls of this struct with the plugin-specific state
* @param pd provider configuration details
* @param url_path rest of the URL after `/kyc-webhook/`
* @param connection MHD connection object (for HTTP headers)
* @param account_id which account to trigger process for
* @param legi_row row in the table the legitimization is for
* @param provider_user_id user ID (or NULL) the proof is for
* @param provider_legitimization_id legitimization ID the proof is for
* @param cb function to call with the result
* @param cb_cls closure for @a cb
* @return handle to cancel operation early
*/
static struct TALER_KYCLOGIC_ProofHandle *
persona_proof (void *cls,
const struct TALER_KYCLOGIC_ProviderDetails *pd,
const char *const url_path[],
struct MHD_Connection *connection,
const struct TALER_PaytoHashP *account_id,
uint64_t legi_row,
const char *provider_user_id,
const char *provider_legitimization_id,
TALER_KYCLOGIC_ProofCallback cb,
void *cb_cls)
{
struct PluginState *ps = cls;
struct TALER_KYCLOGIC_ProofHandle *ph;
CURL *eh;
eh = curl_easy_init ();
if (NULL == eh)
{
GNUNET_break (0);
return NULL;
}
ph = GNUNET_new (struct TALER_KYCLOGIC_ProofHandle);
ph->ps = ps;
ph->pd = pd;
ph->cb = cb;
ph->cb_cls = cb_cls;
ph->connection = connection;
ph->legitimization_uuid = legi_row;
ph->h_payto = *account_id;
if (NULL != provider_user_id)
ph->provider_user_id = GNUNET_strdup (provider_user_id);
if (NULL != provider_legitimization_id)
ph->provider_legitimization_id = GNUNET_strdup (provider_legitimization_id);
GNUNET_asprintf (&ph->url,
"https://withpersona.com/api/v1/inquiries/%s",
provider_legitimization_id);
GNUNET_break (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_VERBOSE,
1));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_MAXREDIRS,
1L));
GNUNET_break (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
ph->url));
ph->job = GNUNET_CURL_job_add2 (ps->curl_ctx,
eh,
pd->slist,
&handle_proof_finished,
ph);
return ph;
}
/**
* Cancel KYC webhook execution.
*
* @param[in] wh handle of operation to cancel
*/
static void
persona_webhook_cancel (struct TALER_KYCLOGIC_WebhookHandle *wh)
{
if (NULL != wh->task)
{
GNUNET_SCHEDULER_cancel (wh->task);
wh->task = NULL;
}
if (NULL != wh->job)
{
GNUNET_CURL_job_cancel (wh->job);
wh->job = NULL;
}
GNUNET_free (wh->inquiry_id);
GNUNET_free (wh->url);
GNUNET_free (wh);
}
/**
* Function called when we're done processing the
* HTTP "/verifications/{verification_id}" request.
*
* @param cls the `struct TALER_KYCLOGIC_WebhookHandle`
* @param response_code HTTP response code, 0 on error
* @param response parsed JSON result, NULL on error
*/
static void
handle_webhook_finished (void *cls,
long response_code,
const void *response)
{
struct TALER_KYCLOGIC_WebhookHandle *wh = cls;
const json_t *j = response;
wh->job = NULL;
json_dumpf (j,
stderr,
JSON_INDENT (2));
#if 0
struct MHD_Response *resp;
switch (response_code)
{
case MHD_HTTP_OK:
{
const char *applicant_id;
const char *verification_id;
const char *status;
bool verified;
json_t *verifications;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("applicant_id",
&applicant_id),
GNUNET_JSON_spec_string ("verification_id",
&verification_id),
GNUNET_JSON_spec_string ("status",
&status), /* completed, pending, ... */
GNUNET_JSON_spec_bool ("verified",
&verified),
GNUNET_JSON_spec_json ("verifications",
&verifications),
GNUNET_JSON_spec_end ()
};
struct GNUNET_TIME_Absolute expiration;
if (GNUNET_OK !=
GNUNET_JSON_parse (j,
spec,
NULL, NULL))
{
GNUNET_break_op (0);
json_dumpf (j,
stderr,
JSON_INDENT (2));
resp = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_uint64 ("persona_http_status",
response_code),
GNUNET_JSON_pack_object_incref ("persona_body",
(json_t *) j));
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_PROVIDER_FAILED,
GNUNET_TIME_UNIT_ZERO_ABS, /* expiration */
MHD_HTTP_BAD_GATEWAY,
resp);
break;
}
if (! verified)
{
log_failure (verifications);
}
resp = MHD_create_response_from_buffer (0,
"",
MHD_RESPMEM_PERSISTENT);
if (verified)
{
expiration = GNUNET_TIME_relative_to_absolute (wh->pd->validity);
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_SUCCESS,
expiration,
MHD_HTTP_NO_CONTENT,
resp);
}
else
{
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_USER_ABORTED,
GNUNET_TIME_UNIT_ZERO_ABS,
MHD_HTTP_NO_CONTENT,
resp);
}
GNUNET_JSON_parse_free (spec);
}
break;
case MHD_HTTP_BAD_REQUEST:
case MHD_HTTP_NOT_FOUND:
case MHD_HTTP_CONFLICT:
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"PERSONA failed with response %u:\n",
(unsigned int) response_code);
json_dumpf (j,
stderr,
JSON_INDENT (2));
resp = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_uint64 ("persona_http_status",
response_code));
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_PROVIDER_FAILED,
GNUNET_TIME_UNIT_ZERO_ABS, /* expiration */
MHD_HTTP_INTERNAL_SERVER_ERROR,
resp);
break;
case MHD_HTTP_UNAUTHORIZED:
case MHD_HTTP_PAYMENT_REQUIRED:
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Refused access with HTTP status code %u\n",
(unsigned int) response_code);
resp = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_uint64 ("persona_http_status",
response_code),
GNUNET_JSON_pack_object_incref ("persona_body",
(json_t *) j));
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_PROVIDER_FAILED,
GNUNET_TIME_UNIT_ZERO_ABS, /* expiration */
MHD_HTTP_NETWORK_AUTHENTICATION_REQUIRED,
resp);
break;
case MHD_HTTP_REQUEST_TIMEOUT:
resp = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_uint64 ("persona_http_status",
response_code),
GNUNET_JSON_pack_object_incref ("persona_body",
(json_t *) j));
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_PROVIDER_FAILED,
GNUNET_TIME_UNIT_ZERO_ABS, /* expiration */
MHD_HTTP_GATEWAY_TIMEOUT,
resp);
break;
case MHD_HTTP_UNPROCESSABLE_ENTITY: /* validation */
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"PERSONA failed with response %u:\n",
(unsigned int) response_code);
json_dumpf (j,
stderr,
JSON_INDENT (2));
resp = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_uint64 ("persona_http_status",
response_code),
GNUNET_JSON_pack_object_incref ("persona_body",
(json_t *) j));
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_PROVIDER_FAILED,
GNUNET_TIME_UNIT_ZERO_ABS, /* expiration */
MHD_HTTP_BAD_GATEWAY,
resp);
break;
case MHD_HTTP_TOO_MANY_REQUESTS:
resp = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_uint64 ("persona_http_status",
response_code),
GNUNET_JSON_pack_object_incref ("persona_body",
(json_t *) j));
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_PROVIDER_FAILED,
GNUNET_TIME_UNIT_ZERO_ABS, /* expiration */
MHD_HTTP_SERVICE_UNAVAILABLE,
resp);
break;
case MHD_HTTP_INTERNAL_SERVER_ERROR:
resp = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_uint64 ("persona_http_status",
response_code),
GNUNET_JSON_pack_object_incref ("persona_body",
(json_t *) j));
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_PROVIDER_FAILED,
GNUNET_TIME_UNIT_ZERO_ABS, /* expiration */
MHD_HTTP_BAD_GATEWAY,
resp);
break;
default:
resp = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_uint64 ("persona_http_status",
response_code),
GNUNET_JSON_pack_object_incref ("persona_body",
(json_t *) j));
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Unexpected PERSONA response %u:\n",
(unsigned int) response_code);
json_dumpf (j,
stderr,
JSON_INDENT (2));
wh->cb (wh->cb_cls,
wh->legi_row,
&wh->h_payto,
wh->applicant_id,
wh->verification_id,
TALER_KYCLOGIC_STATUS_PROVIDER_FAILED,
GNUNET_TIME_UNIT_ZERO_ABS, /* expiration */
MHD_HTTP_BAD_GATEWAY,
resp);
break;
}
#endif
persona_webhook_cancel (wh);
}
/**
* Asynchronously return a reply for the webhook.
*
* @param cls a `struct TALER_KYCLOGIC_WebhookHandle *`
*/
static void
async_webhook_reply (void *cls)
{
struct TALER_KYCLOGIC_WebhookHandle *wh = cls;
wh->cb (wh->cb_cls,
wh->legi_row,
(0 == wh->legi_row)
? NULL
: &wh->h_payto,
NULL, /* FIXME: never known here, but maybe prevent clearing it in the DB as it should already be there? */
wh->inquiry_id, /* provider legi ID */
TALER_KYCLOGIC_STATUS_PROVIDER_FAILED,
GNUNET_TIME_UNIT_ZERO_ABS, /* expiration */
wh->response_code,
wh->resp);
persona_webhook_cancel (wh);
}
/**
* Check KYC status and return result for Webhook. We do NOT implement the
* authentication check proposed by the PERSONA documentation, as it would
* allow an attacker who learns the access token to easily bypass the KYC
* checks. Instead, we insist on explicitly requesting the KYC status from the
* provider (at least on success).
*
* @param cls the @e cls of this struct with the plugin-specific state
* @param pd provider configuration details
* @param plc callback to lookup accounts with
* @param plc_cls closure for @a plc
* @param http_method HTTP method used for the webhook
* @param url_path rest of the URL after `/kyc-webhook/`
* @param connection MHD connection object (for HTTP headers)
* @param body HTTP request body
* @param cb function to call with the result
* @param cb_cls closure for @a cb
* @return handle to cancel operation early
*/
static struct TALER_KYCLOGIC_WebhookHandle *
persona_webhook (void *cls,
const struct TALER_KYCLOGIC_ProviderDetails *pd,
TALER_KYCLOGIC_ProviderLookupCallback plc,
void *plc_cls,
const char *http_method,
const char *const url_path[],
struct MHD_Connection *connection,
const json_t *body,
TALER_KYCLOGIC_WebhookCallback cb,
void *cb_cls)
{
struct PluginState *ps = cls;
struct TALER_KYCLOGIC_WebhookHandle *wh;
CURL *eh;
enum GNUNET_DB_QueryStatus qs;
const char *persona_inquiry_id;
wh = GNUNET_new (struct TALER_KYCLOGIC_WebhookHandle);
wh->cb = cb;
wh->cb_cls = cb_cls;
wh->ps = ps;
wh->pd = pd;
wh->connection = connection;
persona_inquiry_id
= json_string_value (
json_object_get (
json_object_get (
json_object_get (
json_object_get (
json_object_get (
body,
"data"),
"attributes"),
"payload"),
"data"),
"id"));
if (NULL == persona_inquiry_id)
{
GNUNET_break_op (0);
json_dumpf (body,
stderr,
JSON_INDENT (2));
wh->resp = TALER_MHD_MAKE_JSON_PACK (
GNUNET_JSON_pack_object_incref ("webhook_body",
(json_t *) body));
wh->response_code = MHD_HTTP_BAD_REQUEST;
wh->task = GNUNET_SCHEDULER_add_now (&async_webhook_reply,
wh);
return wh;
}
qs = plc (plc_cls,
pd->section,
persona_inquiry_id,
&wh->h_payto,
&wh->legi_row);
if (qs < 0)
{
wh->resp = TALER_MHD_make_error (TALER_EC_GENERIC_DB_FETCH_FAILED,
"provider-legitimization-lookup");
wh->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
wh->task = GNUNET_SCHEDULER_add_now (&async_webhook_reply,
wh);
return wh;
}
if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Received webhook for unknown verification ID `%s'\n",
persona_inquiry_id);
wh->resp = TALER_MHD_make_error (
TALER_EC_EXCHANGE_KYC_PROOF_REQUEST_UNKNOWN,
persona_inquiry_id);
wh->response_code = MHD_HTTP_NOT_FOUND;
wh->task = GNUNET_SCHEDULER_add_now (&async_webhook_reply,
wh);
return wh;
}
wh->inquiry_id = GNUNET_strdup (persona_inquiry_id);
eh = curl_easy_init ();
if (NULL == eh)
{
GNUNET_break (0);
wh->resp = TALER_MHD_make_error (
TALER_EC_GENERIC_ALLOCATION_FAILURE,
NULL);
wh->response_code = MHD_HTTP_INTERNAL_SERVER_ERROR;
wh->task = GNUNET_SCHEDULER_add_now (&async_webhook_reply,
wh);
return wh;
}
GNUNET_asprintf (&wh->url,
"https://withpersona.com/api/v1/inquiries/%s",
persona_inquiry_id);
GNUNET_break (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_VERBOSE,
1));
GNUNET_assert (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_MAXREDIRS,
1L));
GNUNET_break (CURLE_OK ==
curl_easy_setopt (eh,
CURLOPT_URL,
wh->url));
wh->job = GNUNET_CURL_job_add2 (ps->curl_ctx,
eh,
pd->slist,
&handle_webhook_finished,
wh);
return wh;
}
/**
* Initialize persona logic plugin
*
* @param cls a configuration instance
* @return NULL on error, otherwise a `struct TALER_KYCLOGIC_Plugin`
*/
void *
libtaler_plugin_kyclogic_persona_init (void *cls)
{
const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
struct TALER_KYCLOGIC_Plugin *plugin;
struct PluginState *ps;
ps = GNUNET_new (struct PluginState);
ps->cfg = cfg;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
"exchange",
"BASE_URL",
&ps->exchange_base_url))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"exchange",
"BASE_URL");
GNUNET_free (ps);
return NULL;
}
ps->curl_ctx
= GNUNET_CURL_init (&GNUNET_CURL_gnunet_scheduler_reschedule,
&ps->curl_rc);
if (NULL == ps->curl_ctx)
{
GNUNET_break (0);
GNUNET_free (ps->exchange_base_url);
GNUNET_free (ps);
return NULL;
}
ps->curl_rc = GNUNET_CURL_gnunet_rc_create (ps->curl_ctx);
plugin = GNUNET_new (struct TALER_KYCLOGIC_Plugin);
plugin->cls = ps;
plugin->load_configuration
= &persona_load_configuration;
plugin->unload_configuration
= &persona_unload_configuration;
plugin->initiate
= &persona_initiate;
plugin->initiate_cancel
= &persona_initiate_cancel;
plugin->proof
= &persona_proof;
plugin->proof_cancel
= &persona_proof_cancel;
plugin->webhook
= &persona_webhook;
plugin->webhook_cancel
= &persona_webhook_cancel;
return plugin;
}
/**
* Unload authorization plugin
*
* @param cls a `struct TALER_KYCLOGIC_Plugin`
* @return NULL (always)
*/
void *
libtaler_plugin_kyclogic_persona_done (void *cls)
{
struct TALER_KYCLOGIC_Plugin *plugin = cls;
struct PluginState *ps = plugin->cls;
if (NULL != ps->curl_ctx)
{
GNUNET_CURL_fini (ps->curl_ctx);
ps->curl_ctx = NULL;
}
if (NULL != ps->curl_rc)
{
GNUNET_CURL_gnunet_rc_destroy (ps->curl_rc);
ps->curl_rc = NULL;
}
GNUNET_free (ps->exchange_base_url);
GNUNET_free (ps);
GNUNET_free (plugin);
return NULL;
}
/* end of plugin_kyclogic_persona.c */
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