donau

donau-secmod-rsa.c (7821B)

---

 /*
   This file is part of TALER
   Copyright (C) 2014-2025 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 util/donau-secmod-rsa.c
  * @brief Standalone process to perform private key RSA operations
  * @author Christian Grothoff
  *
  * Key design points:
  * - EVERY thread of the exchange will have its own pair of connections to the
  *   crypto helpers.  This way, every thread will also have its own /keys state
  *   and avoid the need to synchronize on those.
  * - auditor signatures and master signatures are to be kept in the exchange DB,
  *   and merged with the public keys of the helper by the exchange HTTPD!
  * - the main loop of the helper is SINGLE-THREADED, but there are
  *   threads for crypto-workers which do the signing in parallel, one per client.
  * - thread-safety: signing happens in parallel, thus when REMOVING private keys,
  *   we must ensure that all signers are done before we fully free() the
  *   private key. This is done by reference counting (as work is always
  *   assigned and collected by the main thread).
  */
 #include "donau_config.h"
 #include <sys/stat.h>
 #include <taler/taler_util.h>
 #include "donau_util.h"
 
 /* LSB-style exit status codes */
 #ifndef EXIT_INVALIDARGUMENT
 /**
  * Command-line arguments are invalid.
  * Restarting useless.
  */
 #define EXIT_INVALIDARGUMENT 2
 #endif
 
 #ifndef EXIT_NOTCONFIGURED
 /**
  * Key configuration settings are missing or invalid.
  * Restarting useless.
  */
 #define EXIT_NOTCONFIGURED 6
 #endif
 
 
 /**
  * Set to true if the configuration is invalid.
  */
 static bool config_invalid;
 
 /**
  * Configuration we use.
  */
 static const struct GNUNET_CONFIGURATION_Handle *my_cfg;
 
 /**
  * Checks the donau configuration section settings.
  * denomination_alias.
  *
  * @param cls must point to a `struct TALER_SECMOD_Options *`
  * @param denomination_alias name of the denomination's section in the configuration
  */
 static void
 load_denominations (void *cls,
                     const char *denomination_alias)
 {
   struct TALER_SECMOD_Options *opts = cls;
   struct GNUNET_TIME_Relative r;
 
   if (0 != strncasecmp (denomination_alias,
                         opts->cprefix,
                         strlen (opts->cprefix)))
     return; /* not a denomination type definition */
 
   if (GNUNET_OK !=
       GNUNET_CONFIGURATION_get_value_time (my_cfg,
                                            denomination_alias,
                                            "DURATION_WITHDRAW",
                                            &r))
   {
     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
                                denomination_alias,
                                "DURATION_WITHDRAW");
     config_invalid = true;
     opts->global_ret = EXIT_NOTCONFIGURED;
     return;
   }
   if (GNUNET_TIME_relative_cmp (r,
                                 !=,
                                 GNUNET_TIME_UNIT_YEARS))
   {
     GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
                                denomination_alias,
                                "DURATION_WITHDRAW",
                                "Must be exactly 1 year for Donau");
     config_invalid = true;
     opts->global_ret = EXIT_NOTCONFIGURED;
     return;
   }
   if (GNUNET_OK !=
       GNUNET_CONFIGURATION_get_value_time (my_cfg,
                                            denomination_alias,
                                            "ANCHOR_ROUND",
                                            &r))
   {
     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
                                denomination_alias,
                                "ANCHOR_ROUND");
     config_invalid = true;
     opts->global_ret = EXIT_NOTCONFIGURED;
     return;
   }
   if (GNUNET_TIME_relative_cmp (r,
                                 !=,
                                 GNUNET_TIME_UNIT_YEARS))
   {
     GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
                                denomination_alias,
                                "ANCHOR_ROUND",
                                "Must be exactly 1 year for Donau");
     config_invalid = true;
     opts->global_ret = EXIT_NOTCONFIGURED;
     return;
   }
 }
 
 
 /**
  * Wrapper around #TALER_SECMOD_rsa_run() that checks that the
  * configuration abides by the Donau-constraints.
  *
  * @param cls must point to a `struct TALER_SECMOD_Options *`
  * @param args remaining command-line arguments
  * @param cfgfile name of the configuration file used (for saving, can be NULL!)
  * @param cfg configuration
  */
 static void
 donau_rsa_run (void *cls,
                char *const *args,
                const char *cfgfile,
                const struct GNUNET_CONFIGURATION_Handle *cfg)
 {
   struct TALER_SECMOD_Options *opts = cls;
   char *secname;
   struct GNUNET_TIME_Relative overlap_duration;
 
   my_cfg = cfg;
   GNUNET_asprintf (&secname,
                    "%s-secmod-rsa",
                    opts->section);
   if (GNUNET_OK !=
       GNUNET_CONFIGURATION_get_value_time (cfg,
                                            secname,
                                            "OVERLAP_DURATION",
                                            &overlap_duration))
   {
     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
                                secname,
                                "OVERLAP_DURATION");
     opts->global_ret = EXIT_NOTCONFIGURED;
     GNUNET_free (secname);
     return;
   }
   if (! GNUNET_TIME_relative_is_zero (overlap_duration))
   {
     GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
                                secname,
                                "OVERLAP_DURATION",
                                "must be zero for Donau");
     opts->global_ret = EXIT_NOTCONFIGURED;
     GNUNET_free (secname);
     return;
   }
   GNUNET_free (secname);
   GNUNET_CONFIGURATION_iterate_sections (cfg,
                                          &load_denominations,
                                          opts);
   if (config_invalid)
   {
     opts->global_ret = EXIT_NOTCONFIGURED;
     return;
   }
   TALER_SECMOD_rsa_run (cls,
                         args,
                         cfgfile,
                         cfg);
 }
 
 
 /**
  * The entry point.
  *
  * @param argc number of arguments in @a argv
  * @param argv command-line arguments
  * @return 0 on normal termination
  */
 int
 main (int argc,
       char **argv)
 {
   struct TALER_SECMOD_Options opts = {
     .max_workers = 16,
     .section = "donau",
     .cprefix = "doco_"
   };
   struct GNUNET_GETOPT_CommandLineOption options[] = {
     TALER_SECMOD_OPTIONS (&opts),
     GNUNET_GETOPT_OPTION_END
   };
   enum GNUNET_GenericReturnValue ret;
 
   /* Restrict permissions for the key files that we create. */
   (void) umask (S_IWGRP | S_IROTH | S_IWOTH | S_IXOTH);
   opts.global_now_tmp
     = opts.global_now
       = GNUNET_TIME_timestamp_get ();
   ret = GNUNET_PROGRAM_run (DONAU_project_data (),
                             argc, argv,
                             "taler-exchange-secmod-rsa",
                             "Handle private RSA key operations for a Donau",
                             options,
                             &donau_rsa_run,
                             &opts);
   if (GNUNET_NO == ret)
     return EXIT_SUCCESS;
   if (GNUNET_SYSERR == ret)
     return EXIT_INVALIDARGUMENT;
   return opts.global_ret;
 }