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 <stdio.h>
  22 #include <sys/stat.h>
  23
  24 #include "crypt-util.h"
  25 #include "log.h"
  26 #include "hexdecoct.h"
  27 #include "string-util.h"
  28 #include "alloc-util.h"
  29
  30 static char *arg_root_hash = NULL;
  31 static char *arg_data_what = NULL;
  32 static char *arg_hash_what = NULL;
  33
  34 static int help(void) {
  35         printf("%s attach VOLUME DATADEVICE HASHDEVICE ROOTHASH\n"
  36                "%s detach VOLUME\n\n"
  37                "Attaches or detaches an integrity protected block device.\n",
  38                program_invocation_short_name,
  39                program_invocation_short_name);
  40
  41         return 0;
  42 }
  43
  44 int main(int argc, char *argv[]) {
  45         _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
  46         int r;
  47
  48         if (argc <= 1) {
  49                 r = help();
  50                 goto finish;
  51         }
  52
  53         if (argc < 3) {
  54                 log_error("This program requires at least two arguments.");
  55                 r = -EINVAL;
  56                 goto finish;
  57         }
  58
  59         log_set_target(LOG_TARGET_AUTO);
  60         log_parse_environment();
  61         log_open();
  62
  63         umask(0022);
  64
  65         if (streq(argv[1], "attach")) {
  66                 _cleanup_free_ void *m = NULL;
  67                 crypt_status_info status;
  68                 size_t l;
  69
  70                 if (argc < 6) {
  71                         log_error("attach requires at least two arguments.");
  72                         r = -EINVAL;
  73                         goto finish;
  74                 }
  75
  76                 r = unhexmem(argv[5], strlen(argv[5]), &m, &l);
  77                 if (r < 0) {
  78                         log_error("Failed to parse root hash.");
  79                         goto finish;
  80                 }
  81
  82                 r = crypt_init(&cd, argv[4]);
  83                 if (r < 0) {
  84                         log_error_errno(r, "Failed to open verity device %s: %m", argv[4]);
  85                         goto finish;
  86                 }
  87
  88                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
  89
  90                 status = crypt_status(cd, argv[2]);
  91                 if (IN_SET(status, CRYPT_ACTIVE, CRYPT_BUSY)) {
  92                         log_info("Volume %s already active.", argv[2]);
  93                         r = 0;
  94                         goto finish;
  95                 }
  96
  97                 r = crypt_load(cd, CRYPT_VERITY, NULL);
  98                 if (r < 0) {
  99                         log_error_errno(r, "Failed to load verity superblock: %m");
 100                         goto finish;
 101                 }
 102
 103                 r = crypt_set_data_device(cd, argv[3]);
 104                 if (r < 0) {
 105                         log_error_errno(r, "Failed to configure data device: %m");
 106                         goto finish;
 107                 }
 108
 109                 r = crypt_activate_by_volume_key(cd, argv[2], m, l, CRYPT_ACTIVATE_READONLY);
 110                 if (r < 0) {
 111                         log_error_errno(r, "Failed to set up verity device: %m");
 112                         goto finish;
 113                 }
 114
 115         } else if (streq(argv[1], "detach")) {
 116
 117                 r = crypt_init_by_name(&cd, argv[2]);
 118                 if (r == -ENODEV) {
 119                         log_info("Volume %s already inactive.", argv[2]);
 120                         goto finish;
 121                 } else if (r < 0) {
 122                         log_error_errno(r, "crypt_init_by_name() failed: %m");
 123                         goto finish;
 124                 }
 125
 126                 crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
 127
 128                 r = crypt_deactivate(cd, argv[2]);
 129                 if (r < 0) {
 130                         log_error_errno(r, "Failed to deactivate: %m");
 131                         goto finish;
 132                 }
 133
 134         } else {
 135                 log_error("Unknown verb %s.", argv[1]);
 136                 r = -EINVAL;
 137                 goto finish;
 138         }
 139
 140         r = 0;
 141
 142 finish:
 143         free(arg_root_hash);
 144         free(arg_data_what);
 145         free(arg_hash_what);
 146
 147         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 148 }