/*-*- 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 <string.h> #include <errno.h> #include <unistd.h> #include "log.h" #include "util.h" #include "unit-name.h" #include "mkdir.h" #include "strv.h" #include "fileio.h" static const char *arg_dest = "/tmp"; static bool arg_enabled = true; static bool arg_read_crypttab = true; static char **arg_disks = NULL; static char **arg_options = NULL; static char *arg_keyfile = NULL; static bool has_option(const char *haystack, const char *needle) { const char *f = haystack; size_t l; assert(needle); if (!haystack) return false; l = strlen(needle); while ((f = strstr(f, needle))) { if (f > haystack && f[-1] != ',') { f++; continue; } if (f[l] != 0 && f[l] != ',') { f++; continue; } return true; } return false; } 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; _cleanup_fclose_ FILE *f = NULL; bool noauto, nofail, tmp, swap; char *from; int r; assert(name); assert(device); noauto = has_option(options, "noauto"); nofail = has_option(options, "nofail"); tmp = has_option(options, "tmp"); swap = has_option(options, "swap"); 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(); n = unit_name_build("systemd-cryptsetup", e, ".service"); if (!n) return log_oom(); p = strjoin(arg_dest, "/", n, NULL); if (!p) return log_oom(); u = fstab_node_to_udev_node(device); if (!u) return log_oom(); d = unit_name_from_path(u, ".device"); if (!d) return log_oom(); f = fopen(p, "wxe"); if (!f) { log_error("Failed to create unit file %s: %m", p); return -errno; } 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=systemd-readahead-collect.service systemd-readahead-replay.service\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 (is_device_path(uu)) { _cleanup_free_ char *dd; dd = unit_name_from_path(uu, ".device"); if (!dd) return log_oom(); 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); 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(options), 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); fflush(f); if (ferror(f)) { log_error("Failed to write file %s: %m", p); return -errno; } from = strappenda("../", 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) { log_error("Failed to create symlink %s: %m", to); return -errno; } 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) { log_error("Failed to create symlink %s: %m", to); return -errno; } } 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) { log_error("Failed to create symlink %s: %m", to); return -errno; } if (!noauto && !nofail) { free(p); p = strjoin(arg_dest, "/dev-mapper-", e, ".device.d/50-job-timeout-sec-0.conf", NULL); if (!p) return log_oom(); mkdir_parents_label(p, 0755); r = write_string_file(p, "# Automatically generated by systemd-cryptsetup-generator\n\n" "[Unit]\n" "JobTimeoutSec=0\n"); /* the binary handles timeouts anyway */ if (r < 0) { log_error("Failed to write device drop-in: %s", strerror(-r)); return r; } } return 0; } static int parse_proc_cmdline_item(const char *key, const char *value) { int r; 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) { if (strv_extend(&arg_disks, value) < 0) return log_oom(); } else if (STR_IN_SET(key, "luks.options", "rd.luks.options") && value) { if (strv_extend(&arg_options, value) < 0) return log_oom(); } else if (STR_IN_SET(key, "luks.key", "rd.luks.key") && value) { free(arg_keyfile); arg_keyfile = strdup(value); if (!arg_keyfile) return log_oom(); } else if (startswith(key, "luks.") || startswith(key, "rd.luks.")) log_warning("Unknown kernel switch %s. Ignoring.", key); return 0; } int main(int argc, char *argv[]) { _cleanup_strv_free_ char **disks_done = NULL; _cleanup_fclose_ FILE *f = NULL; unsigned n = 0; int r = EXIT_FAILURE, r2 = EXIT_FAILURE; char **i; 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); if (parse_proc_cmdline(parse_proc_cmdline_item) < 0) goto cleanup; if (!arg_enabled) { r = r2 = EXIT_SUCCESS; goto cleanup; } strv_uniq(arg_disks); if (arg_read_crypttab) { struct stat st; f = fopen("/etc/crypttab", "re"); if (!f) { if (errno == ENOENT) r = EXIT_SUCCESS; else log_error("Failed to open /etc/crypttab: %m"); goto next; } if (fstat(fileno(f), &st) < 0) { log_error("Failed to stat /etc/crypttab: %m"); goto next; } /* If we readd support for specifying passphrases * directly in crypttabe we should upgrade the warning * below, though possibly only if a passphrase is * specified directly. */ if (st.st_mode & 0005) log_debug("/etc/crypttab is world-readable. This is usually not a good idea."); for (;;) { char line[LINE_MAX], *l; _cleanup_free_ char *name = NULL, *device = NULL, *password = NULL, *options = NULL; int k; if (!fgets(line, sizeof(line), f)) break; n++; l = strstrip(line); if (*l == '#' || *l == 0) continue; k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options); if (k < 2 || k > 4) { log_error("Failed to parse /etc/crypttab:%u, ignoring.", n); continue; } /* If options are specified on the kernel commandline, let them override the ones from crypttab. */ STRV_FOREACH(i, arg_options) { _cleanup_free_ char *proc_uuid = NULL, *proc_options = NULL; const char *p = *i; k = sscanf(p, "%m[0-9a-fA-F-]=%ms", &proc_uuid, &proc_options); if (k == 2 && streq(proc_uuid, device + 5)) { free(options); options = strdup(p); if (!proc_options) { log_oom(); goto cleanup; } } } if (arg_disks) { /* If luks UUIDs are specified on the kernel command line, use them as a filter for /etc/crypttab and only generate units for those. */ STRV_FOREACH(i, arg_disks) { _cleanup_free_ char *proc_device = NULL, *proc_name = NULL; const char *p = *i; if (startswith(p, "luks-")) p += 5; proc_name = strappend("luks-", p); proc_device = strappend("UUID=", p); if (!proc_name || !proc_device) { log_oom(); goto cleanup; } if (streq(proc_device, device) || streq(proc_name, name)) { if (create_disk(name, device, password, options) < 0) goto cleanup; if (strv_extend(&disks_done, p) < 0) { log_oom(); goto cleanup; } } } } else if (create_disk(name, device, password, options) < 0) goto cleanup; } } r = EXIT_SUCCESS; next: STRV_FOREACH(i, arg_disks) { /* Generate units for those UUIDs, which were specified on the kernel command line and not yet written. */ _cleanup_free_ char *name = NULL, *device = NULL, *options = NULL; const char *p = *i; if (startswith(p, "luks-")) p += 5; if (strv_contains(disks_done, p)) continue; name = strappend("luks-", p); device = strappend("UUID=", p); if (!name || !device) { log_oom(); goto cleanup; } if (arg_options) { /* If options are specified on the kernel commandline, use them. */ char **j; STRV_FOREACH(j, arg_options) { _cleanup_free_ char *proc_uuid = NULL, *proc_options = NULL; const char *s = *j; int k; k = sscanf(s, "%m[0-9a-fA-F-]=%ms", &proc_uuid, &proc_options); if (k == 2) { if (streq(proc_uuid, device + 5)) { free(options); options = proc_options; proc_options = NULL; } } else if (!options) { /* Fall back to options without a specified UUID */ options = strdup(s); if (!options) { log_oom(); goto cleanup; }; } } } if (!options) { options = strdup("timeout=0"); if (!options) { log_oom(); goto cleanup; } } if (create_disk(name, device, arg_keyfile, options) < 0) goto cleanup; } r2 = EXIT_SUCCESS; cleanup: strv_free(arg_disks); strv_free(arg_options); free(arg_keyfile); return r != EXIT_SUCCESS ? r : r2; }