src/veritysetup/veritysetup.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2016 Lennart Poettering
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <sys/stat.h>
  24
  25 #include "alloc-util.h"
  26 #include "crypt-util.h"
  27 #include "hexdecoct.h"
  28 #include "log.h"
  29 #include "string-util.h"
  30
  31 static char *arg_root_hash = NULL;
  32 static char *arg_data_what = NULL;
  33 static char *arg_hash_what = NULL;
  34
  35 static int help(void) {
  36         printf("%s attach VOLUME DATADEVICE HASHDEVICE ROOTHASH\n"
  37                "%s detach VOLUME\n\n"
  38                "Attaches or detaches an integrity protected block device.\n",
  39                program_invocation_short_name,
  40                program_invocation_short_name);
  41
  42         return 0;
  43 }
  44
  45 int main(int argc, char *argv[]) {
  46         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
  47         int r;
  48
  49         if (argc <= 1) {
  50                 r = help();
  51                 goto finish;
  52         }
  53
  54         if (argc < 3) {
  55                 log_error("This program requires at least two arguments.");
  56                 r = -EINVAL;
  57                 goto finish;
  58         }
  59
  60         log_set_target(LOG_TARGET_AUTO);
  61         log_parse_environment();
  62         log_open();
  63
  64         umask(0022);
  65
  66         if (streq(argv[1], "attach")) {
  67                 _cleanup_free_ void *m = NULL;
  68                 crypt_status_info status;
  69                 size_t l;
  70
  71                 if (argc < 6) {
  72                         log_error("attach requires at least two arguments.");
  73                         r = -EINVAL;
  74                         goto finish;
  75                 }
  76
  77                 r = unhexmem(argv[5], strlen(argv[5]), &m, &l);
  78                 if (r < 0) {
  79                         log_error("Failed to parse root hash.");
  80                         goto finish;
  81                 }
  82
  83                 r = crypt_init(&cd, argv[4]);
  84                 if (r < 0) {
  85                         log_error_errno(r, "Failed to open verity device %s: %m", argv[4]);
  86                         goto finish;
  87                 }
  88
  89                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
  90
  91                 status = crypt_status(cd, argv[2]);
  92                 if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
  93                         log_info("Volume %s already active.", argv[2]);
  94                         r = 0;
  95                         goto finish;
  96                 }
  97
  98                 r = crypt_load(cd, CRYPT_VERITY, NULL);
  99                 if (r < 0) {
 100                         log_error_errno(r, "Failed to load verity superblock: %m");
 101                         goto finish;
 102                 }
 103
 104                 r = crypt_set_data_device(cd, argv[3]);
 105                 if (r < 0) {
 106                         log_error_errno(r, "Failed to configure data device: %m");
 107                         goto finish;
 108                 }
 109
 110                 r = crypt_activate_by_volume_key(cd, argv[2], m, l, CRYPT_ACTIVATE_READONLY);
 111                 if (r < 0) {
 112                         log_error_errno(r, "Failed to set up verity device: %m");
 113                         goto finish;
 114                 }
 115
 116         } else if (streq(argv[1], "detach")) {
 117
 118                 r = crypt_init_by_name(&cd, argv[2]);
 119                 if (r == -ENODEV) {
 120                         log_info("Volume %s already inactive.", argv[2]);
 121                         goto finish;
 122                 } else if (r < 0) {
 123                         log_error_errno(r, "crypt_init_by_name() failed: %m");
 124                         goto finish;
 125                 }
 126
 127                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 128
 129                 r = crypt_deactivate(cd, argv[2]);
 130                 if (r < 0) {
 131                         log_error_errno(r, "Failed to deactivate: %m");
 132                         goto finish;
 133                 }
 134
 135         } else {
 136                 log_error("Unknown verb %s.", argv[1]);
 137                 r = -EINVAL;
 138                 goto finish;
 139         }
 140
 141         r = 0;
 142
 143 finish:
 144         free(arg_root_hash);
 145         free(arg_data_what);
 146         free(arg_hash_what);
 147
 148         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 149 }