| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdio_ext.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| #include "alloc-util.h" |
| #include "dropin.h" |
| #include "escape.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "fstab-util.h" |
| #include "generator.h" |
| #include "hashmap.h" |
| #include "id128-util.h" |
| #include "log.h" |
| #include "mkdir.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "proc-cmdline.h" |
| #include "specifier.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "unit-name.h" |
| #include "util.h" |
| |
| typedef struct crypto_device { |
| char *uuid; |
| char *keyfile; |
| char *keydev; |
| char *name; |
| char *options; |
| bool create; |
| } crypto_device; |
| |
| static const char *arg_dest = NULL; |
| 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_DESTRUCTOR_REGISTER(arg_disks, hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_default_options, freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_default_keyfile, freep); |
| |
| static int generate_keydev_mount(const char *name, const char *keydev, char **unit, char **mount) { |
| _cleanup_free_ char *u = NULL, *what = NULL, *where = NULL, *name_escaped = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| int r; |
| |
| assert(name); |
| assert(keydev); |
| assert(unit); |
| assert(mount); |
| |
| r = mkdir_parents("/run/systemd/cryptsetup", 0755); |
| if (r < 0) |
| return r; |
| |
| r = mkdir("/run/systemd/cryptsetup", 0700); |
| if (r < 0 && errno != EEXIST) |
| return -errno; |
| |
| name_escaped = cescape(name); |
| if (!name_escaped) |
| return -ENOMEM; |
| |
| where = strjoin("/run/systemd/cryptsetup/keydev-", name_escaped); |
| if (!where) |
| return -ENOMEM; |
| |
| r = mkdir(where, 0700); |
| if (r < 0 && errno != EEXIST) |
| return -errno; |
| |
| r = unit_name_from_path(where, ".mount", &u); |
| if (r < 0) |
| return r; |
| |
| r = generator_open_unit_file(arg_dest, NULL, u, &f); |
| if (r < 0) |
| return r; |
| |
| what = fstab_node_to_udev_node(keydev); |
| if (!what) |
| return -ENOMEM; |
| |
| fprintf(f, |
| "[Unit]\n" |
| "DefaultDependencies=no\n\n" |
| "[Mount]\n" |
| "What=%s\n" |
| "Where=%s\n" |
| "Options=ro\n", what, where); |
| |
| r = fflush_and_check(f); |
| if (r < 0) |
| return r; |
| |
| *unit = TAKE_PTR(u); |
| *mount = TAKE_PTR(where); |
| |
| return 0; |
| } |
| |
| static int create_disk( |
| const char *name, |
| const char *device, |
| const char *keydev, |
| const char *password, |
| const char *options) { |
| |
| _cleanup_free_ char *n = NULL, *d = NULL, *u = NULL, *e = NULL, |
| *filtered = NULL, *u_escaped = NULL, *password_escaped = NULL, *filtered_escaped = NULL, *name_escaped = NULL, *keydev_mount = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| const char *dmname; |
| bool noauto, nofail, tmp, swap, netdev; |
| 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"); |
| netdev = fstab_test_option(options, "_netdev\0"); |
| |
| if (tmp && swap) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", |
| name); |
| |
| name_escaped = specifier_escape(name); |
| if (!name_escaped) |
| return log_oom(); |
| |
| e = unit_name_escape(name); |
| if (!e) |
| return log_oom(); |
| |
| u = fstab_node_to_udev_node(device); |
| if (!u) |
| 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"); |
| |
| u_escaped = specifier_escape(u); |
| if (!u_escaped) |
| 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"); |
| |
| if (password) { |
| password_escaped = specifier_escape(password); |
| if (!password_escaped) |
| return log_oom(); |
| } |
| |
| if (keydev && !password) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "Key device is specified, but path to the password file is missing."); |
| |
| r = generator_open_unit_file(arg_dest, NULL, n, &f); |
| if (r < 0) |
| return r; |
| |
| fprintf(f, |
| "[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" |
| "IgnoreOnIsolate=true\n" |
| "After=%s\n", |
| netdev ? "remote-fs-pre.target" : "cryptsetup-pre.target"); |
| |
| if (keydev) { |
| _cleanup_free_ char *unit = NULL, *p = NULL; |
| |
| r = generate_keydev_mount(name, keydev, &unit, &keydev_mount); |
| if (r < 0) |
| return log_error_errno(r, "Failed to generate keydev mount unit: %m"); |
| |
| p = prefix_root(keydev_mount, password_escaped); |
| if (!p) |
| return log_oom(); |
| |
| free_and_replace(password_escaped, p); |
| } |
| |
| if (!nofail) |
| fprintf(f, |
| "Before=%s\n", |
| netdev ? "remote-cryptsetup.target" : "cryptsetup.target"); |
| |
| if (password) { |
| if (PATH_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random")) |
| fputs("After=systemd-random-seed.service\n", f); |
| else if (!STR_IN_SET(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 (path_startswith(uu, "/dev/")) { |
| _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_escaped); |
| } |
| } |
| } |
| |
| if (path_startswith(u, "/dev/")) { |
| fprintf(f, |
| "BindsTo=%s\n" |
| "After=%s\n" |
| "Before=umount.target\n", |
| d, d); |
| |
| if (swap) |
| fputs("Before=dev-mapper-%i.swap\n", |
| f); |
| } else |
| /* For loopback devices, add systemd-tmpfiles-setup-dev.service |
| dependency to ensure that loopback support is available in |
| the kernel (/dev/loop-control needs to exist) */ |
| fprintf(f, |
| "RequiresMountsFor=%s\n" |
| "Requires=systemd-tmpfiles-setup-dev.service\n" |
| "After=systemd-tmpfiles-setup-dev.service\n", |
| u_escaped); |
| |
| r = generator_write_timeouts(arg_dest, device, name, options, &filtered); |
| if (r < 0) |
| return r; |
| |
| if (filtered) { |
| filtered_escaped = specifier_escape(filtered); |
| if (!filtered_escaped) |
| return log_oom(); |
| } |
| |
| fprintf(f, |
| "\n[Service]\n" |
| "Type=oneshot\n" |
| "RemainAfterExit=yes\n" |
| "TimeoutSec=0\n" /* the binary handles timeouts anyway */ |
| "KeyringMode=shared\n" /* make sure we can share cached keys among instances */ |
| "OOMScoreAdjust=500\n" /* unlocking can allocate a lot of memory if Argon2 is used */ |
| "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" |
| "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", |
| name_escaped, u_escaped, strempty(password_escaped), strempty(filtered_escaped), |
| name_escaped); |
| |
| if (tmp) |
| fprintf(f, |
| "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", |
| name_escaped); |
| |
| if (swap) |
| fprintf(f, |
| "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", |
| name_escaped); |
| |
| if (keydev) |
| fprintf(f, |
| "ExecStartPost=" UMOUNT_PATH " %s\n\n", |
| keydev_mount); |
| |
| r = fflush_and_check(f); |
| if (r < 0) |
| return log_error_errno(r, "Failed to write unit file %s: %m", n); |
| |
| if (!noauto) { |
| r = generator_add_symlink(arg_dest, |
| netdev ? "remote-cryptsetup.target" : "cryptsetup.target", |
| nofail ? "wants" : "requires", n); |
| if (r < 0) |
| return r; |
| } |
| |
| dmname = strjoina("dev-mapper-", e, ".device"); |
| r = generator_add_symlink(arg_dest, dmname, "requires", n); |
| if (r < 0) |
| return r; |
| |
| if (!noauto && !nofail) { |
| 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 crypto_device* crypt_device_free(crypto_device *d) { |
| if (!d) |
| return NULL; |
| |
| free(d->uuid); |
| free(d->keyfile); |
| free(d->keydev); |
| free(d->name); |
| free(d->options); |
| return mfree(d); |
| } |
| |
| 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) |
| return mfree(d); |
| |
| r = hashmap_put(arg_disks, d->uuid, d); |
| if (r < 0) { |
| free(d->uuid); |
| return mfree(d); |
| } |
| } |
| |
| return d; |
| } |
| |
| static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
| _cleanup_free_ char *uuid = NULL, *uuid_value = NULL; |
| crypto_device *d; |
| int r; |
| |
| if (streq(key, "luks")) { |
| |
| r = value ? parse_boolean(value) : 1; |
| if (r < 0) |
| log_warning("Failed to parse luks= kernel command line switch %s. Ignoring.", value); |
| else |
| arg_enabled = r; |
| |
| } else if (streq(key, "luks.crypttab")) { |
| |
| r = value ? parse_boolean(value) : 1; |
| if (r < 0) |
| log_warning("Failed to parse luks.crypttab= kernel command line switch %s. Ignoring.", value); |
| else |
| arg_read_crypttab = r; |
| |
| } else if (streq(key, "luks.uuid")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| d = get_crypto_device(startswith(value, "luks-") ? value+5 : value); |
| if (!d) |
| return log_oom(); |
| |
| d->create = arg_whitelist = true; |
| |
| } else if (streq(key, "luks.options")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| 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_and_replace(d->options, uuid_value); |
| } else if (free_and_strdup(&arg_default_options, value) < 0) |
| return log_oom(); |
| |
| } else if (streq(key, "luks.key")) { |
| size_t n; |
| _cleanup_free_ char *keyfile = NULL, *keydev = NULL; |
| char *c; |
| const char *keyspec; |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| n = strspn(value, LETTERS DIGITS "-"); |
| if (value[n] != '=') { |
| if (free_and_strdup(&arg_default_keyfile, value) < 0) |
| return log_oom(); |
| return 0; |
| } |
| |
| uuid = strndup(value, n); |
| if (!uuid) |
| return log_oom(); |
| |
| if (!id128_is_valid(uuid)) { |
| log_warning("Failed to parse luks.key= kernel command line switch. UUID is invalid, ignoring."); |
| return 0; |
| } |
| |
| d = get_crypto_device(uuid); |
| if (!d) |
| return log_oom(); |
| |
| keyspec = value + n + 1; |
| c = strrchr(keyspec, ':'); |
| if (c) { |
| *c = '\0'; |
| keyfile = strdup(keyspec); |
| keydev = strdup(c + 1); |
| |
| if (!keyfile || !keydev) |
| return log_oom(); |
| } else { |
| /* No keydev specified */ |
| keyfile = strdup(keyspec); |
| if (!keyfile) |
| return log_oom(); |
| } |
| |
| free_and_replace(d->keyfile, keyfile); |
| free_and_replace(d->keydev, keydev); |
| } else if (streq(key, "luks.name")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| 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_and_replace(d->name, uuid_value); |
| } else |
| log_warning("Failed to parse luks name switch %s. Ignoring.", value); |
| } |
| |
| return 0; |
| } |
| |
| static int add_crypttab_devices(void) { |
| _cleanup_fclose_ FILE *f = NULL; |
| unsigned crypttab_line = 0; |
| struct stat st; |
| int r; |
| |
| 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; |
| } |
| |
| (void) __fsetlocking(f, FSETLOCKING_BYCALLER); |
| |
| if (fstat(fileno(f), &st) < 0) { |
| log_error_errno(errno, "Failed to stat /etc/crypttab: %m"); |
| return 0; |
| } |
| |
| for (;;) { |
| _cleanup_free_ char *line = NULL, *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL; |
| crypto_device *d = NULL; |
| char *l, *uuid; |
| int k; |
| |
| r = read_line(f, LONG_LINE_MAX, &line); |
| if (r < 0) |
| return log_error_errno(r, "Failed to read /etc/crypttab: %m"); |
| if (r == 0) |
| break; |
| |
| crypttab_line++; |
| |
| l = strstrip(line); |
| if (IN_SET(l[0], 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_SET(device, "UUID=", "luks-"); |
| if (!uuid) |
| uuid = path_startswith(device, "/dev/disk/by-uuid/"); |
| 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, NULL, 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->keydev, d->keyfile ?: arg_default_keyfile, options); |
| if (r < 0) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(crypt_device_hash_ops, char, string_hash_func, string_compare_func, |
| crypto_device, crypt_device_free); |
| |
| static int run(const char *dest, const char *dest_early, const char *dest_late) { |
| int r; |
| |
| assert_se(arg_dest = dest); |
| |
| arg_disks = hashmap_new(&crypt_device_hash_ops); |
| if (!arg_disks) |
| return log_oom(); |
| |
| r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX); |
| if (r < 0) |
| return log_warning_errno(r, "Failed to parse kernel command line: %m"); |
| |
| if (!arg_enabled) |
| return 0; |
| |
| r = add_crypttab_devices(); |
| if (r < 0) |
| return r; |
| |
| r = add_proc_cmdline_devices(); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| DEFINE_MAIN_GENERATOR_FUNCTION(run); |