src/cryptsetup.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <string.h>
  23 #include <errno.h>
  24
  25 #include <libcryptsetup.h>
  26
  27 #include "log.h"
  28 #include "util.h"
  29 #include "ask-password-api.h"
  30
  31 static unsigned opt_tries = 0;
  32 static char *opt_cipher = NULL;
  33 static unsigned opt_size = 0;
  34 static char *opt_hash = NULL;
  35 static bool opt_readonly = false;
  36 static bool opt_verify = false;
  37 static usec_t arg_timeout = 0;
  38
  39 static int parse_one_option(const char *option) {
  40         assert(option);
  41
  42         /* Handled outside of this tool */
  43         if (streq(option, "swap") ||
  44             streq(option, "tmp") ||
  45             streq(option, "noauto"))
  46                 return 0;
  47
  48         if (startswith(option, "cipher=")) {
  49                 char *t;
  50
  51                 if (!(t = strdup(option+7)))
  52                         return -ENOMEM;
  53
  54                 free(opt_cipher);
  55                 opt_cipher = t;
  56
  57         } else if (startswith(option, "size=")) {
  58
  59                 if (safe_atou(option+5, &opt_size) < 0) {
  60                         log_error("size= parse failure, ignoring.");
  61                         return 0;
  62                 }
  63
  64         } else if (startswith(option, "hash=")) {
  65                 char *t;
  66
  67                 if (!(t = strdup(option+5)))
  68                         return -ENOMEM;
  69
  70                 free(opt_hash);
  71                 opt_hash = t;
  72
  73         } else if (startswith(option, "tries=")) {
  74
  75                 if (safe_atou(option+6, &opt_tries) < 0) {
  76                         log_error("tries= parse failure, ignoring.");
  77                         return 0;
  78                 }
  79
  80         } else if (streq(option, "readonly"))
  81                 opt_readonly = true;
  82         else if (streq(option, "verify"))
  83                 opt_verify = true;
  84         else if (startswith(option, "timeout=")) {
  85
  86                 if (parse_usec(option+8, &arg_timeout) < 0) {
  87                         log_error("timeout= parse failure, ignoring.");
  88                         return 0;
  89                 }
  90
  91         } else
  92                 log_error("Encountered unknown /etc/crypttab option '%s', ignoring.", option);
  93
  94         return 0;
  95 }
  96
  97 static int parse_options(const char *options) {
  98         char *state;
  99         char *w;
 100         size_t l;
 101
 102         assert(options);
 103
 104         FOREACH_WORD_SEPARATOR(w, l, options, ",", state) {
 105                 char *o;
 106                 int r;
 107
 108                 if (!(o = strndup(w, l)))
 109                         return -ENOMEM;
 110
 111                 r = parse_one_option(o);
 112                 free(o);
 113
 114                 if (r < 0)
 115                         return r;
 116         }
 117
 118         return 0;
 119 }
 120
 121 static void log_glue(int level, const char *msg, void *usrptr) {
 122
 123         log_full(level == CRYPT_LOG_ERROR   ? LOG_ERR :
 124                  level == CRYPT_LOG_VERBOSE ? LOG_INFO :
 125                  level == CRYPT_LOG_DEBUG   ? LOG_DEBUG :
 126                                               LOG_NOTICE,
 127                  "%s", msg);
 128 }
 129
 130 static int password_glue(const char *msg, char *buf, size_t length, void *usrptr) {
 131         usec_t until;
 132         char *password = NULL;
 133         int k;
 134
 135         until = now(CLOCK_MONOTONIC) + (arg_timeout > 0 ? arg_timeout : 60 * USEC_PER_SEC);
 136
 137         if ((k = ask_password_agent(msg, "drive-harddisk", until, &password)) < 0)
 138                 return k;
 139
 140         strncpy(buf, password, length-1);
 141         buf[length-1] = 0;
 142
 143         free(password);
 144
 145         return strlen(buf);
 146 }
 147
 148 int main(int argc, char *argv[]) {
 149         int r = EXIT_FAILURE;
 150         struct crypt_device *cd = NULL;
 151
 152         if (argc < 3) {
 153                 log_error("This program requires at least two arguments.");
 154                 return EXIT_FAILURE;
 155         }
 156
 157         log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
 158         log_parse_environment();
 159         log_open();
 160
 161         if (streq(argv[1], "attach") ||
 162             streq(argv[1], "format-and-attach")) {
 163                 uint32_t flags = 0;
 164                 int k;
 165                 const char *key_file = NULL;
 166
 167                 if (argc < 4) {
 168                         log_error("attach requires at least two arguments.");
 169                         goto finish;
 170                 }
 171
 172                 if (argc >= 5 && argv[4][0] && !streq(argv[4], "-")) {
 173
 174                         if (!path_is_absolute(argv[4]))
 175                                 log_error("Password file path %s is not absolute. Ignoring.", argv[4]);
 176                         else
 177                                 key_file = argv[4];
 178                 }
 179
 180                 if (argc >= 6 && argv[5][0] && !streq(argv[5], "-"))
 181                         parse_options(argv[5]);
 182
 183                 if ((k = crypt_init(&cd, argv[3]))) {
 184                         log_error("crypt_init() failed: %s", strerror(-k));
 185                         goto finish;
 186                 }
 187
 188                 crypt_set_log_callback(cd, log_glue, NULL);
 189                 crypt_set_password_callback(cd, password_glue, NULL);
 190
 191                 if (streq(argv[1], "format-and-attach")) {
 192
 193                         /* Format with random key and attach */
 194
 195                         log_error("Formatting not yet supported.");
 196                         goto finish;
 197
 198                 } else if ((k = crypt_load(cd, CRYPT_LUKS1, NULL))) {
 199                         log_error("crypt_load() failed: %s", strerror(-k));
 200                         goto finish;
 201                 }
 202
 203                 if (opt_readonly)
 204                         flags |= CRYPT_ACTIVATE_READONLY;
 205
 206                 if (key_file) {
 207                         crypt_set_password_retry(cd, 1);
 208                         k = crypt_activate_by_keyfile(cd, argv[2], CRYPT_ANY_SLOT, key_file, 0, flags);
 209                 } else  {
 210                         crypt_set_password_retry(cd, opt_tries > 0 ? opt_tries : 3);
 211                         k = crypt_activate_by_passphrase(cd, argv[2], CRYPT_ANY_SLOT, NULL, 0, flags);
 212                 }
 213
 214                 if (k < 0) {
 215                         log_error("Failed to activate: %s", strerror(-k));
 216                         goto finish;
 217                 }
 218
 219         } else if (streq(argv[1], "detach")) {
 220                 int k;
 221
 222                 if ((k = crypt_init_by_name(&cd, argv[2]))) {
 223                         log_error("crypt_init() failed: %s", strerror(-k));
 224                         goto finish;
 225                 }
 226
 227                 crypt_set_log_callback(cd, log_glue, NULL);
 228
 229                 if ((k = crypt_deactivate(cd, argv[2])) < 0) {
 230                         log_error("Failed to deactivate: %s", strerror(-k));
 231                         goto finish;
 232                 }
 233
 234         } else {
 235                 log_error("Unknown verb %s.", argv[1]);
 236                 goto finish;
 237         }
 238
 239         r = EXIT_SUCCESS;
 240
 241 finish:
 242
 243         if (cd)
 244                 crypt_free(cd);
 245
 246         return r;
 247 }