/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include "dropin.h" #include "generator.h" #include "hashmap.h" #include "log.h" #include "mkdir.h" #include "path-util.h" #include "fstab-util.h" #include "strv.h" #include "unit-name.h" #include "util.h" typedef struct crypto_device { char *uuid; char *keyfile; char *name; char *options; bool create; } crypto_device; static const char *arg_dest = "/tmp"; static bool arg_enabled = true; static bool arg_read_crypttab = true; static bool arg_whitelist = false; static Hashmap *arg_disks = NULL; static char *arg_default_options = NULL; static char *arg_default_keyfile = NULL; static int create_disk( const char *name, const char *device, const char *password, const char *options) { _cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *to = NULL, *e = NULL, *filtered = NULL; _cleanup_fclose_ FILE *f = NULL; bool noauto, nofail, tmp, swap; char *from; int r; assert(name); assert(device); noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0"); nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0"); tmp = fstab_test_option(options, "tmp\0"); swap = fstab_test_option(options, "swap\0"); if (tmp && swap) { log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name); return -EINVAL; } e = unit_name_escape(name); if (!e) return log_oom(); r = unit_name_build("systemd-cryptsetup", e, ".service", &n); if (r < 0) return log_error_errno(r, "Failed to generate unit name: %m"); p = strjoin(arg_dest, "/", n, NULL); if (!p) return log_oom(); u = fstab_node_to_udev_node(device); if (!u) return log_oom(); r = unit_name_from_path(u, ".device", &d); if (r < 0) return log_error_errno(r, "Failed to generate unit name: %m"); f = fopen(p, "wxe"); if (!f) return log_error_errno(errno, "Failed to create unit file %s: %m", p); fputs( "# Automatically generated by systemd-cryptsetup-generator\n\n" "[Unit]\n" "Description=Cryptography Setup for %I\n" "Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:systemd-cryptsetup@.service(8)\n" "SourcePath=/etc/crypttab\n" "DefaultDependencies=no\n" "Conflicts=umount.target\n" "BindsTo=dev-mapper-%i.device\n" "IgnoreOnIsolate=true\n" "After=cryptsetup-pre.target\n", f); if (!nofail) fprintf(f, "Before=cryptsetup.target\n"); if (password) { if (STR_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random")) fputs("After=systemd-random-seed.service\n", f); else if (!streq(password, "-") && !streq(password, "none")) { _cleanup_free_ char *uu; uu = fstab_node_to_udev_node(password); if (!uu) return log_oom(); if (!path_equal(uu, "/dev/null")) { if (is_device_path(uu)) { _cleanup_free_ char *dd = NULL; r = unit_name_from_path(uu, ".device", &dd); if (r < 0) return log_error_errno(r, "Failed to generate unit name: %m"); fprintf(f, "After=%1$s\nRequires=%1$s\n", dd); } else fprintf(f, "RequiresMountsFor=%s\n", password); } } } if (is_device_path(u)) fprintf(f, "BindsTo=%s\n" "After=%s\n" "Before=umount.target\n", d, d); else fprintf(f, "RequiresMountsFor=%s\n", u); r = generator_write_timeouts(arg_dest, device, name, options, &filtered); if (r < 0) return r; fprintf(f, "\n[Service]\n" "Type=oneshot\n" "RemainAfterExit=yes\n" "TimeoutSec=0\n" /* the binary handles timeouts anyway */ "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", name, u, strempty(password), strempty(filtered), name); if (tmp) fprintf(f, "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", name); if (swap) fprintf(f, "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", name); r = fflush_and_check(f); if (r < 0) return log_error_errno(r, "Failed to write file %s: %m", p); from = strjoina("../", n); if (!noauto) { to = strjoin(arg_dest, "/", d, ".wants/", n, NULL); if (!to) return log_oom(); mkdir_parents_label(to, 0755); if (symlink(from, to) < 0) return log_error_errno(errno, "Failed to create symlink %s: %m", to); free(to); if (!nofail) to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL); else to = strjoin(arg_dest, "/cryptsetup.target.wants/", n, NULL); if (!to) return log_oom(); mkdir_parents_label(to, 0755); if (symlink(from, to) < 0) return log_error_errno(errno, "Failed to create symlink %s: %m", to); } free(to); to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n, NULL); if (!to) return log_oom(); mkdir_parents_label(to, 0755); if (symlink(from, to) < 0) return log_error_errno(errno, "Failed to create symlink %s: %m", to); if (!noauto && !nofail) { _cleanup_free_ char *dmname; dmname = strjoin("dev-mapper-", e, ".device", NULL); if (!dmname) return log_oom(); r = write_drop_in(arg_dest, dmname, 90, "device-timeout", "# Automatically generated by systemd-cryptsetup-generator \n\n" "[Unit]\nJobTimeoutSec=0"); if (r < 0) return log_error_errno(r, "Failed to write device drop-in: %m"); } return 0; } static void free_arg_disks(void) { crypto_device *d; while ((d = hashmap_steal_first(arg_disks))) { free(d->uuid); free(d->keyfile); free(d->name); free(d->options); free(d); } hashmap_free(arg_disks); } static crypto_device *get_crypto_device(const char *uuid) { int r; crypto_device *d; assert(uuid); d = hashmap_get(arg_disks, uuid); if (!d) { d = new0(struct crypto_device, 1); if (!d) return NULL; d->create = false; d->keyfile = d->options = d->name = NULL; d->uuid = strdup(uuid); if (!d->uuid) { free(d); return NULL; } r = hashmap_put(arg_disks, d->uuid, d); if (r < 0) { free(d->uuid); free(d); return NULL; } } return d; } static int parse_proc_cmdline_item(const char *key, const char *value) { int r; crypto_device *d; _cleanup_free_ char *uuid = NULL, *uuid_value = NULL; if (STR_IN_SET(key, "luks", "rd.luks") && value) { r = parse_boolean(value); if (r < 0) log_warning("Failed to parse luks switch %s. Ignoring.", value); else arg_enabled = r; } else if (STR_IN_SET(key, "luks.crypttab", "rd.luks.crypttab") && value) { r = parse_boolean(value); if (r < 0) log_warning("Failed to parse luks crypttab switch %s. Ignoring.", value); else arg_read_crypttab = r; } else if (STR_IN_SET(key, "luks.uuid", "rd.luks.uuid") && value) { d = get_crypto_device(startswith(value, "luks-") ? value+5 : value); if (!d) return log_oom(); d->create = arg_whitelist = true; } else if (STR_IN_SET(key, "luks.options", "rd.luks.options") && value) { r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); if (r == 2) { d = get_crypto_device(uuid); if (!d) return log_oom(); free(d->options); d->options = uuid_value; uuid_value = NULL; } else if (free_and_strdup(&arg_default_options, value) < 0) return log_oom(); } else if (STR_IN_SET(key, "luks.key", "rd.luks.key") && value) { r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); if (r == 2) { d = get_crypto_device(uuid); if (!d) return log_oom(); free(d->keyfile); d->keyfile = uuid_value; uuid_value = NULL; } else if (free_and_strdup(&arg_default_keyfile, value)) return log_oom(); } else if (STR_IN_SET(key, "luks.name", "rd.luks.name") && value) { r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value); if (r == 2) { d = get_crypto_device(uuid); if (!d) return log_oom(); d->create = arg_whitelist = true; free(d->name); d->name = uuid_value; uuid_value = NULL; } else log_warning("Failed to parse luks name switch %s. Ignoring.", value); } return 0; } static int add_crypttab_devices(void) { struct stat st; unsigned crypttab_line = 0; _cleanup_fclose_ FILE *f = NULL; if (!arg_read_crypttab) return 0; f = fopen("/etc/crypttab", "re"); if (!f) { if (errno != ENOENT) log_error_errno(errno, "Failed to open /etc/crypttab: %m"); return 0; } if (fstat(fileno(f), &st) < 0) { log_error_errno(errno, "Failed to stat /etc/crypttab: %m"); return 0; } for (;;) { int r, k; char line[LINE_MAX], *l, *uuid; crypto_device *d = NULL; _cleanup_free_ char *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL; if (!fgets(line, sizeof(line), f)) break; crypttab_line++; l = strstrip(line); if (*l == '#' || *l == 0) continue; k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &keyfile, &options); if (k < 2 || k > 4) { log_error("Failed to parse /etc/crypttab:%u, ignoring.", crypttab_line); continue; } uuid = startswith(device, "UUID="); if (!uuid) uuid = path_startswith(device, "/dev/disk/by-uuid/"); if (!uuid) uuid = startswith(name, "luks-"); if (uuid) d = hashmap_get(arg_disks, uuid); if (arg_whitelist && !d) { log_info("Not creating device '%s' because it was not specified on the kernel command line.", name); continue; } r = create_disk(name, device, keyfile, (d && d->options) ? d->options : options); if (r < 0) return r; if (d) d->create = false; } return 0; } static int add_proc_cmdline_devices(void) { int r; Iterator i; crypto_device *d; HASHMAP_FOREACH(d, arg_disks, i) { const char *options; _cleanup_free_ char *device = NULL; if (!d->create) continue; if (!d->name) { d->name = strappend("luks-", d->uuid); if (!d->name) return log_oom(); } device = strappend("UUID=", d->uuid); if (!device) return log_oom(); if (d->options) options = d->options; else if (arg_default_options) options = arg_default_options; else options = "timeout=0"; r = create_disk(d->name, device, d->keyfile ?: arg_default_keyfile, options); if (r < 0) return r; } return 0; } int main(int argc, char *argv[]) { int r = EXIT_FAILURE; if (argc > 1 && argc != 4) { log_error("This program takes three or no arguments."); return EXIT_FAILURE; } if (argc > 1) arg_dest = argv[1]; log_set_target(LOG_TARGET_SAFE); log_parse_environment(); log_open(); umask(0022); arg_disks = hashmap_new(&string_hash_ops); if (!arg_disks) goto cleanup; r = parse_proc_cmdline(parse_proc_cmdline_item); if (r < 0) { log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); r = EXIT_FAILURE; } if (!arg_enabled) { r = EXIT_SUCCESS; goto cleanup; } if (add_crypttab_devices() < 0) goto cleanup; if (add_proc_cmdline_devices() < 0) goto cleanup; r = EXIT_SUCCESS; cleanup: free_arg_disks(); free(arg_default_options); free(arg_default_keyfile); return r; }