diff options
Diffstat (limited to 'src/cryptsetup/cryptsetup-generator.c')
| -rw-r--r-- | src/cryptsetup/cryptsetup-generator.c | 509 |
1 files changed, 0 insertions, 509 deletions
diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c deleted file mode 100644 index 8ac5ab730a..0000000000 --- a/src/cryptsetup/cryptsetup-generator.c +++ /dev/null @@ -1,509 +0,0 @@ -/*** - 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 "alloc-util.h" -#include "dropin.h" -#include "fd-util.h" -#include "fileio.h" -#include "fstab-util.h" -#include "generator.h" -#include "hashmap.h" -#include "log.h" -#include "mkdir.h" -#include "parse-util.h" -#include "path-util.h" -#include "proc-cmdline.h" -#include "string-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) < 0) - 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; -} |