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446 lines
12 KiB
446 lines
12 KiB
/*
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* gfsecret - Secret sharing tools
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* Copyright (C) 2016,2017,2018,2019,2020 Damien Goutte-Gattat
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#include <locale.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <err.h>
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#include <gcrypt.h>
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#include <xmem.h>
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#include "util.h"
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#include "secretcfg.h"
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#include "scheme-module.h"
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static void
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usage(int status)
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{
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puts(_("Usage: gfsec-split [options] file uri...\n\
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Split the specified file for later use with gfsec-use.\n"));
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puts(_("Options:\n\
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-h, --help Display this help message.\n\
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-v, --version Display the version message.\n"));
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puts(_("\
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-n, --threshold N Specify the minimal number of shares\n\
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required to re-assemble the secret.\n\
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Default is 2.\n\
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-s, --share URI Add a share.\n\
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-i, --interactive Prompt the user for share URIs.\n"));
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puts(_("\
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-c, --config FILE Write configuration to the specified\n\
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file. Default is the basename of the\n\
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split file in gfsecret's configuration\n\
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directory.\n"));
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puts(_("\
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-k, --keep Do not delete the original file.\n"));
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puts(_("\
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-o, --output FILE Specify the location where the file will\n\
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be reconstructed by gfsec-use. The default\n\
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is to reconstruct the file at its original\n\
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location.\n\
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-r, --restore-cmd CMD Specify the command to restore the secret.\n\
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-d, --destroy-cmd CMD Specify the command to delete the secret.\n"));
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puts(_("\
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-l, --list-supports List available supports and exit.\n"));
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printf(_("Report bugs to <%s>.\n"), PACKAGE_BUGREPORT);
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exit(status);
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}
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static void
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info(void)
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{
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printf(_("\
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gfsec-split (%s %s)\n\
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Copyright (C) 2020 Damien Goutte-Gattat\n\
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\n\
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This program is released under the GNU General Public License.\n\
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See the COPYING file or <http://www.gnu.org/licenses/gpl.html>.\n\
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"), PACKAGE_NAME, VERSION);
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exit(EXIT_SUCCESS);
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}
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static char *
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ask(const char *prompt)
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{
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char *buffer = NULL;
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size_t len = 0;
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ssize_t n;
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printf("%s ", prompt);
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if ( (n = getline(&buffer, &len, stdin)) == -1 )
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err(EXIT_FAILURE, _("Cannot read from standard input"));
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else if ( n > 0 && buffer[n - 1] == '\n' )
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buffer[n - 1] = '\0';
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return buffer;
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}
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static char *
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ask_nonempty(const char *prompt)
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{
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char *answer;
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int done = 0;
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do {
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answer = ask(prompt);
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if ( ! (done = *answer != '\0') )
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free(answer);
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} while ( ! done );
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return answer;
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}
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static int
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ask_confirmation(const char *prompt)
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{
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int rc = 0;
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char *answer;
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answer = ask(prompt);
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if ( (*answer == 'y' || *answer == 'Y') && *(answer + 1) == '\0' )
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rc = 1;
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free(answer);
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return rc;
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}
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static int
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prompt_for_share(gfsec_secret_t *cfg, gfsec_supports_list_t *list, unsigned number)
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{
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int i, rc;
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char *answer, *path;
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gfsec_share_t *share;
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rc = -1;
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printf(_("Select a support for share #%u:\n\n"), number);
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for ( i = 0; (unsigned)i < list->count; i++ )
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printf(" (%d) %s\n", i+1, list->supports[i].description);
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printf(_(" (x) Done\n\n"));
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while ( rc == -1 ) {
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answer = ask (_("Your choice?"));
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if ( (*answer == 'x' || *answer == 'X') && *(answer + 1) == '\0' )
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rc = 1; /* We're done selecting supports. */
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else {
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int selected;
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selected = strtol(answer, NULL, 10);
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if ( selected > 0 && (unsigned)selected < list->count + 1 ) {
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path = ask_nonempty(_("Specify a pathname on this support:"));
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share = gfsec_share_new();
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gfsec_share_set_info(share, GFSEC_SHARE_NUMBER_AUTOASSIGN,
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list->supports[selected - 1].scheme,
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list->supports[selected - 1].authority,
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path, NULL);
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if ( (i = gfsec_secret_add_share(cfg, share)) != 0 )
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errx(EXIT_FAILURE, _("Cannot add share: %s"), gfsec_error_string(i));
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rc = 0; /* Done for this share. */
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free(path);
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}
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}
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free(answer);
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}
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return rc;
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}
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static void
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interactive_loop(gfsec_secret_t *cfg)
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{
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gfsec_supports_list_t *list;
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int i;
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char buffer[255];
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list = gfsec_scheme_module_get_supports();
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i = 0;
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while ( ! prompt_for_share(cfg, list, ++i) ) ;
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gfsec_support_destroy_list(list);
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printf(_("\nThe following shares will be created:\n"));
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for ( i = 0; i < cfg->n_shares; i++ ) {
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gfsec_share_get_uri(cfg->shares[i], buffer, sizeof(buffer));
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printf(" %s\n", buffer);
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}
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putchar('\n');
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if ( ! ask_confirmation(_("Proceed (y/N)?")) )
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errx(EXIT_FAILURE, _("Split cancelled"));
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}
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static void
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transform_config_pathname(char **cfg, const char *secret)
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{
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char *base = NULL;
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if ( ! *cfg )
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base = get_file_basename(secret);
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else if ( ! strchr(*cfg, '/') && ! strchr(*cfg, '.') )
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base = xstrdup(*cfg);
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if ( base ) {
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const char *env_info;
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char *config_dir = NULL;
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if ( (env_info = getenv("XDG_CONFIG_HOME")) && *env_info)
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xasprintf(&config_dir, "%s/gfsecret", env_info);
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else if ( (env_info = getenv("HOME")) && *env_info )
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xasprintf(&config_dir, "%s/.config/gfsecret", env_info);
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if ( config_dir ) {
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if ( makedir(config_dir, 0700) == -1 )
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err(EXIT_FAILURE, "Cannot create configuration directory");
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xasprintf(cfg, "%s/%s.conf", config_dir, base);
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free(config_dir);
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}
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else
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xasprintf(cfg, "%s.conf", base);
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free(base);
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}
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}
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static unsigned
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get_uinteger_or_die(const char *arg)
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{
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unsigned val;
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char *endptr;
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errno = 0;
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val = strtoul(arg, &endptr, 10);
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if ( errno != 0 || endptr == arg )
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errx(EXIT_FAILURE, _("Invalid argument, unsigned integer expected: %s"), arg);
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return val;
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}
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int
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main(int argc, char **argv)
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{
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int c, list_mode, interactive;
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unsigned threshold, keep_original;
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char *config_path, *secret_file, *output_file;
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gfsec_secret_t *cfg;
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struct option options[] = {
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{ "help", 0, NULL, 'h' },
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{ "version", 0, NULL, 'v' },
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{ "threshold", 1, NULL, 'n' },
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/* Keep bogus spelling for compatibility. */
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{ "treshold", 1, NULL, 'n' },
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{ "share", 1, NULL, 's' },
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{ "interactive", 0, NULL, 'i' },
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{ "config", 1, NULL, 'c' },
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{ "keep", 0, NULL, 'k' },
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{ "output", 1, NULL, 'o' },
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{ "restore-cmd", 1, NULL, 'r' },
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{ "destroy-cmd", 1, NULL, 'd' },
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{ "list-supports", 0, NULL, 'l' },
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{ NULL, 0, NULL, 0 }
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};
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setprogname(argv[0]);
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threshold = 2;
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keep_original = list_mode = interactive = 0;
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config_path = output_file = NULL;
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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srandom(time(NULL));
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cfg = gfsec_secret_new();
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while ( (c = getopt_long(argc, argv, "hvn:s:ic:ko:r:d:l",
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options, NULL)) != -1 ) {
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switch ( c ) {
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case 'h':
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usage(EXIT_SUCCESS);
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break;
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case '?':
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usage(EXIT_FAILURE);
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break;
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case 'v':
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info();
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break;
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case 'n':
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threshold = get_uinteger_or_die(optarg);
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break;
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case 's':
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if ( (c = gfsec_parse_uri(optarg, cfg, 1)) != 0 )
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errx(EXIT_FAILURE, _("Cannot add share: %s"), gfsec_error_string(c));
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break;
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case 'i':
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interactive = 1;
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break;
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case 'c':
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config_path = optarg;
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break;
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case 'k':
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keep_original = 1;
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break;
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case 'o':
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output_file = optarg;
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break;
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case 'r':
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cfg->restore = xstrdup(optarg);
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break;
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case 'd':
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cfg->destroy = xstrdup(optarg);
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break;
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case 'l':
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list_mode = 1;
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break;
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}
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}
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gfsec_scheme_module_init();
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if ( list_mode ) {
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gfsec_supports_list_t *list;
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char *schemes[] = { "file", "uuid", "label", "mtp" };
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char fmt[32], name[64];
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unsigned i, len, max_len;
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list = gfsec_scheme_module_get_supports();
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for ( i = max_len = 0; i < list->count; i++ ) {
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len = snprintf(NULL, 0, "%s://%s/ ",
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schemes[list->supports[i].scheme],
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list->supports[i].authority);
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if ( len > max_len )
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max_len = len;
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}
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snprintf(fmt, sizeof(fmt), "%%-%ds%%s\n", max_len);
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for ( i = 0; i < list->count; i++ ) {
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snprintf(name, sizeof(name), "%s://%s/",
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schemes[list->supports[i].scheme],
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list->supports[i].authority);
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printf(fmt, name, list->supports[i].description);
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}
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gfsec_support_destroy_list(list);
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exit(EXIT_SUCCESS);
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}
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if ( ! gcry_check_version(GCRYPT_VERSION) )
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errx(EXIT_FAILURE, _("libgcrypt version mismatch"));
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gcry_control(GCRYCTL_DISABLE_SECMEM, 0);
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gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
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if ( optind >= argc )
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errx(EXIT_FAILURE, _("Missing secret file"));
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secret_file = argv[optind++];
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transform_config_pathname(&config_path, secret_file);
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if ( file_exists(config_path) != -1 ) {
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warn(_("Configuration file %s already exists"), config_path);
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if ( ! ask_confirmation(_("Overwrite (y/N)?")) )
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errx(EXIT_FAILURE, _("Split cancelled"));
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}
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if ( (c = gfsec_secret_set_secret_file(cfg, secret_file, output_file)) != 0 )
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errx(EXIT_FAILURE, _("Cannot set secret: %s"), gfsec_error_string(c));
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while ( optind < argc ) {
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if ( (c = gfsec_parse_uri(argv[optind++], cfg, 1)) != 0 )
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errx(EXIT_FAILURE, _("Cannot add share: %s"), gfsec_error_string(c));
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}
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if ( interactive )
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interactive_loop(cfg);
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if ( (c = gfsec_secret_split(cfg, threshold)) != 0 )
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errx(EXIT_FAILURE, _("Cannot split secret: %s"), gfsec_error_string(c));
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for ( c = 0; c < cfg->n_shares; c++ ) {
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gfsec_share_t *share;
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share = cfg->shares[c];
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if ( gfsec_scheme_module_put_file(share->scheme, share->authority,
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share->path, share->data, share->len)
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!= GFSEC_SCHEME_STATUS_SUCCESS )
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errx(EXIT_FAILURE, _("Cannot write share"));
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}
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if ( (c = gfsec_write_config(cfg, config_path)) != 0 )
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errx(EXIT_FAILURE, _("Cannot write configuration file: %s"),
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gfsec_error_string(c));
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if ( ! keep_original ) {
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if ( cfg->destroy ) {
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int status;
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status = system(cfg->destroy);
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if ( ! WIFEXITED(status) )
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errx(EXIT_FAILURE, _("Delete command terminated anormally"));
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}
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if ( unlink(secret_file) == -1 )
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err(EXIT_FAILURE, _("Cannot delete original file"));
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}
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gfsec_secret_free(cfg);
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return EXIT_SUCCESS;
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}
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