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-rw-r--r--src/cryptsetup/cryptsetup-generator.c929
1 files changed, 929 insertions, 0 deletions
diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c
new file mode 100644
index 0000000..07903f1
--- /dev/null
+++ b/src/cryptsetup/cryptsetup-generator.c
@@ -0,0 +1,929 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <fcntl.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 *headerdev;
+ char *datadev;
+ 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 const char *arg_crypttab = NULL;
+static const char *arg_runtime_directory = NULL;
+static bool arg_allow_list = 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 split_locationspec(const char *locationspec, char **ret_file, char **ret_device) {
+ _cleanup_free_ char *file = NULL, *device = NULL;
+ const char *c;
+
+ assert(ret_file);
+ assert(ret_device);
+
+ if (!locationspec) {
+ *ret_file = *ret_device = NULL;
+ return 0;
+ }
+
+ c = strrchr(locationspec, ':');
+ if (c) {
+ /* The device part has to be either an absolute path to device node (/dev/something,
+ * /dev/foo/something, or even possibly /dev/foo/something:part), or a fstab device
+ * specification starting with LABEL= or similar. The file part has the same syntax.
+ *
+ * Let's try to guess if the second part looks like a device specification, or just part of a
+ * filename with a colon. fstab_node_to_udev_node() will convert the fstab device syntax to
+ * an absolute path. If we didn't get an absolute path, assume that it is just part of the
+ * first file argument. */
+
+ device = fstab_node_to_udev_node(c + 1);
+ if (!device)
+ return log_oom();
+
+ if (path_is_absolute(device))
+ file = strndup(locationspec, c-locationspec);
+ else {
+ log_debug("Location specification argument contains a colon, but \"%s\" doesn't look like a device specification.\n"
+ "Assuming that \"%s\" is a single device specification.",
+ c + 1, locationspec);
+ device = mfree(device);
+ c = NULL;
+ }
+ }
+
+ if (!c)
+ /* No device specified */
+ file = strdup(locationspec);
+
+ if (!file)
+ return log_oom();
+
+ *ret_file = TAKE_PTR(file);
+ *ret_device = TAKE_PTR(device);
+
+ return 0;
+}
+
+static int generate_device_mount(
+ const char *name,
+ const char *device,
+ const char *type_prefix, /* "keydev" or "headerdev" */
+ const char *device_timeout,
+ bool canfail,
+ bool readonly,
+ char **unit,
+ char **mount) {
+
+ _cleanup_free_ char *u = NULL, *where = NULL, *name_escaped = NULL, *device_unit = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+ usec_t timeout_us;
+
+ assert(name);
+ assert(device);
+ assert(unit);
+ assert(mount);
+
+ r = mkdir_parents(arg_runtime_directory, 0755);
+ if (r < 0)
+ return r;
+
+ r = mkdir(arg_runtime_directory, 0700);
+ if (r < 0 && errno != EEXIST)
+ return -errno;
+
+ name_escaped = cescape(name);
+ if (!name_escaped)
+ return -ENOMEM;
+
+ where = strjoin(arg_runtime_directory, "/", type_prefix, "-", 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;
+
+ fprintf(f,
+ "[Unit]\n"
+ "DefaultDependencies=no\n\n"
+ "[Mount]\n"
+ "What=%s\n"
+ "Where=%s\n"
+ "Options=%s%s\n", device, where, readonly ? "ro" : "rw", canfail ? ",nofail" : "");
+
+ if (device_timeout) {
+ r = parse_sec_fix_0(device_timeout, &timeout_us);
+ if (r >= 0) {
+ r = unit_name_from_path(device, ".device", &device_unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ r = write_drop_in_format(arg_dest, device_unit, 90, "device-timeout",
+ "# Automatically generated by systemd-cryptsetup-generator \n\n"
+ "[Unit]\nJobRunningTimeoutSec=%s", device_timeout);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write device drop-in: %m");
+
+ } else
+ log_warning_errno(r, "Failed to parse %s, ignoring: %m", device_timeout);
+
+ }
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return r;
+
+ *unit = TAKE_PTR(u);
+ *mount = TAKE_PTR(where);
+
+ return 0;
+}
+
+static int generate_device_umount(const char *name,
+ const char *device_mount,
+ const char *type_prefix, /* "keydev" or "headerdev" */
+ char **ret_umount_unit) {
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_free_ char *u = NULL, *name_escaped = NULL, *mount = NULL;
+ int r;
+
+ assert(name);
+ assert(ret_umount_unit);
+
+ name_escaped = cescape(name);
+ if (!name_escaped)
+ return -ENOMEM;
+
+ u = strjoin(type_prefix, "-", name_escaped, "-umount.service");
+ if (!u)
+ return -ENOMEM;
+
+ r = unit_name_from_path(device_mount, ".mount", &mount);
+ if (r < 0)
+ return r;
+
+ r = generator_open_unit_file(arg_dest, NULL, u, &f);
+ if (r < 0)
+ return r;
+
+ fprintf(f,
+ "[Unit]\n"
+ "DefaultDependencies=no\n"
+ "After=%s\n\n"
+ "[Service]\n"
+ "ExecStart=-" UMOUNT_PATH " %s\n\n", mount, device_mount);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return r;
+
+ *ret_umount_unit = TAKE_PTR(u);
+ return 0;
+}
+
+static int print_dependencies(FILE *f, const char* device_path, const char* timeout_value, bool canfail) {
+ int r;
+
+ assert(!canfail || timeout_value);
+
+ if (STR_IN_SET(device_path, "-", "none"))
+ /* None, nothing to do */
+ return 0;
+
+ if (PATH_IN_SET(device_path,
+ "/dev/urandom",
+ "/dev/random",
+ "/dev/hw_random",
+ "/dev/hwrng")) {
+ /* RNG device, add random dep */
+ fputs("After=systemd-random-seed.service\n", f);
+ return 0;
+ }
+
+ _cleanup_free_ char *udev_node = fstab_node_to_udev_node(device_path);
+ if (!udev_node)
+ return log_oom();
+
+ if (path_equal(udev_node, "/dev/null"))
+ return 0;
+
+ if (path_startswith(udev_node, "/dev/")) {
+ /* We are dealing with a block device, add dependency for corresponding unit */
+ _cleanup_free_ char *unit = NULL;
+
+ r = unit_name_from_path(udev_node, ".device", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ fprintf(f, "After=%1$s\n", unit);
+ if (canfail) {
+ fprintf(f, "Wants=%1$s\n", unit);
+ r = write_drop_in_format(arg_dest, unit, 90, "device-timeout",
+ "# Automatically generated by systemd-cryptsetup-generator \n\n"
+ "[Unit]\nJobRunningTimeoutSec=%s", timeout_value);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write device drop-in: %m");
+ } else
+ fprintf(f, "Requires=%1$s\n", unit);
+ } else {
+ /* Regular file, add mount dependency */
+ _cleanup_free_ char *escaped_path = specifier_escape(device_path);
+ if (!escaped_path)
+ return log_oom();
+
+ fprintf(f, "RequiresMountsFor=%s\n", escaped_path);
+ }
+
+ return 0;
+}
+
+static int create_disk(
+ const char *name,
+ const char *device,
+ const char *key_file,
+ const char *keydev,
+ const char *headerdev,
+ const char *options,
+ const char *source) {
+
+ _cleanup_free_ char *n = NULL, *d = NULL, *u = NULL, *e = NULL,
+ *keydev_mount = NULL, *keyfile_timeout_value = NULL,
+ *filtered = NULL, *u_escaped = NULL, *name_escaped = NULL, *header_path = NULL, *key_file_buffer = NULL,
+ *tmp_fstype = NULL, *filtered_header = NULL, *headerdev_mount = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ const char *dmname;
+ bool noauto, nofail, swap, netdev, attach_in_initrd;
+ int r, detached_header, keyfile_can_timeout, tmp;
+
+ 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");
+ swap = fstab_test_option(options, "swap\0");
+ netdev = fstab_test_option(options, "_netdev\0");
+ attach_in_initrd = fstab_test_option(options, "x-initrd.attach\0");
+
+ keyfile_can_timeout = fstab_filter_options(options,
+ "keyfile-timeout\0",
+ NULL, &keyfile_timeout_value, NULL, NULL);
+ if (keyfile_can_timeout < 0)
+ return log_error_errno(keyfile_can_timeout, "Failed to parse keyfile-timeout= option value: %m");
+
+ detached_header = fstab_filter_options(
+ options,
+ "header\0",
+ NULL,
+ &header_path,
+ NULL,
+ headerdev ? &filtered_header : NULL);
+ if (detached_header < 0)
+ return log_error_errno(detached_header, "Failed to parse header= option value: %m");
+
+ tmp = fstab_filter_options(options, "tmp\0", NULL, &tmp_fstype, NULL, NULL);
+ if (tmp < 0)
+ return log_error_errno(tmp, "Failed to parse tmp= option value: %m");
+
+ 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 (keydev && !key_file)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Key device is specified, but path to the key file is missing.");
+
+ r = generator_open_unit_file(arg_dest, NULL, n, &f);
+ if (r < 0)
+ return r;
+
+ r = generator_write_cryptsetup_unit_section(f, source);
+ if (r < 0)
+ return r;
+
+ if (netdev)
+ fprintf(f, "After=remote-fs-pre.target\n");
+
+ /* If initrd takes care of attaching the disk then it should also detach it during shutdown. */
+ if (!attach_in_initrd)
+ fprintf(f, "Conflicts=umount.target\n");
+
+ if (keydev) {
+ _cleanup_free_ char *unit = NULL, *umount_unit = NULL;
+
+ r = generate_device_mount(
+ name,
+ keydev,
+ "keydev",
+ keyfile_timeout_value,
+ /* canfail = */ keyfile_can_timeout > 0,
+ /* readonly= */ true,
+ &unit,
+ &keydev_mount);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate keydev mount unit: %m");
+
+ r = generate_device_umount(name, keydev_mount, "keydev", &umount_unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate keydev umount unit: %m");
+
+ key_file_buffer = path_join(keydev_mount, key_file);
+ if (!key_file_buffer)
+ return log_oom();
+
+ key_file = key_file_buffer;
+
+ fprintf(f, "After=%s\n", unit);
+ if (keyfile_can_timeout > 0)
+ fprintf(f, "Wants=%s\n", unit);
+ else
+ fprintf(f, "Requires=%s\n", unit);
+
+ if (umount_unit)
+ fprintf(f,
+ "Wants=%s\n"
+ "Before=%s\n",
+ umount_unit,
+ umount_unit
+ );
+ }
+
+ if (headerdev) {
+ _cleanup_free_ char *unit = NULL, *umount_unit = NULL, *p = NULL;
+
+ r = generate_device_mount(
+ name,
+ headerdev,
+ "headerdev",
+ NULL,
+ /* canfail= */ false, /* header is always necessary */
+ /* readonly= */ false, /* LUKS2 recovery requires rw header access */
+ &unit,
+ &headerdev_mount);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate header device mount unit: %m");
+
+ r = generate_device_umount(name, headerdev_mount, "headerdev", &umount_unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate header device umount unit: %m");
+
+ p = path_join(headerdev_mount, header_path);
+ if (!p)
+ return log_oom();
+
+ free_and_replace(header_path, p);
+
+ if (isempty(filtered_header))
+ p = strjoin("header=", header_path);
+ else
+ p = strjoin(filtered_header, ",header=", header_path);
+
+ if (!p)
+ return log_oom();
+
+ free_and_replace(filtered_header, p);
+ options = filtered_header;
+
+ fprintf(f, "After=%s\n"
+ "Requires=%s\n", unit, unit);
+
+ if (umount_unit)
+ fprintf(f,
+ "Wants=%s\n"
+ "Before=%s\n",
+ umount_unit,
+ umount_unit
+ );
+ }
+
+ if (!nofail)
+ fprintf(f,
+ "Before=%s\n",
+ netdev ? "remote-cryptsetup.target" : "cryptsetup.target");
+
+ if (key_file && !keydev) {
+ r = print_dependencies(f, key_file,
+ keyfile_timeout_value,
+ /* canfail= */ keyfile_can_timeout > 0);
+ if (r < 0)
+ return r;
+ }
+
+ /* Check if a header option was specified */
+ if (detached_header > 0 && !headerdev) {
+ r = print_dependencies(f, header_path,
+ NULL,
+ /* canfail= */ false); /* header is always necessary */
+ if (r < 0)
+ return r;
+ }
+
+ if (path_startswith(u, "/dev/"))
+ fprintf(f,
+ "BindsTo=%s\n"
+ "After=%s\n"
+ "Before=umount.target\n",
+ d, d);
+ 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)
+ log_warning_errno(r, "Failed to write device timeout drop-in: %m");
+
+ r = generator_write_cryptsetup_service_section(f, name, u, key_file, filtered);
+ if (r < 0)
+ return r;
+
+ if (tmp) {
+ _cleanup_free_ char *tmp_fstype_escaped = NULL;
+
+ if (tmp_fstype) {
+ tmp_fstype_escaped = specifier_escape(tmp_fstype);
+ if (!tmp_fstype_escaped)
+ return log_oom();
+ }
+
+ fprintf(f,
+ "ExecStartPost=" ROOTLIBEXECDIR "/systemd-makefs '%s' '/dev/mapper/%s'\n",
+ tmp_fstype_escaped ?: "ext4", name_escaped);
+ }
+
+ if (swap)
+ fprintf(f,
+ "ExecStartPost=" ROOTLIBEXECDIR "/systemd-makefs swap '/dev/mapper/%s'\n",
+ name_escaped);
+
+ 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, 40, "device-timeout",
+ "# Automatically generated by systemd-cryptsetup-generator\n\n"
+ "[Unit]\nJobTimeoutSec=0");
+ if (r < 0)
+ log_warning_errno(r, "Failed to write device timeout 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->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 bool warn_uuid_invalid(const char *uuid, const char *key) {
+ assert(key);
+
+ if (!id128_is_valid(uuid)) {
+ log_warning("Failed to parse %s= kernel command line switch. UUID is invalid, ignoring.", key);
+ return true;
+ }
+
+ return false;
+}
+
+static int filter_header_device(const char *options,
+ char **ret_headerdev,
+ char **ret_filtered_headerdev_options) {
+ int r;
+ _cleanup_free_ char *headerfile = NULL, *headerdev = NULL, *headerspec = NULL,
+ *filtered_headerdev = NULL, *filtered_headerspec = NULL;
+
+ assert(ret_headerdev);
+ assert(ret_filtered_headerdev_options);
+
+ r = fstab_filter_options(options, "header\0", NULL, &headerspec, NULL, &filtered_headerspec);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse header= option value: %m");
+
+ if (r > 0) {
+ r = split_locationspec(headerspec, &headerfile, &headerdev);
+ if (r < 0)
+ return r;
+
+ if (isempty(filtered_headerspec))
+ filtered_headerdev = strjoin("header=", headerfile);
+ else
+ filtered_headerdev = strjoin(filtered_headerspec, ",header=", headerfile);
+
+ if (!filtered_headerdev)
+ return log_oom();
+ } else
+ filtered_headerdev = TAKE_PTR(filtered_headerspec);
+
+ *ret_filtered_headerdev_options = TAKE_PTR(filtered_headerdev);
+ *ret_headerdev = TAKE_PTR(headerdev);
+
+ return 0;
+}
+
+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);
+ if (!d)
+ return log_oom();
+
+ d->create = arg_allow_list = true;
+
+ } else if (streq(key, "luks.options")) {
+ _cleanup_free_ char *headerdev = NULL, *filtered_headerdev_options = NULL;
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ r = sscanf(value, "%m[0-9a-fA-F-]=%ms", &uuid, &uuid_value);
+ if (r != 2)
+ return free_and_strdup_warn(&arg_default_options, value);
+
+ if (warn_uuid_invalid(uuid, key))
+ return 0;
+
+ d = get_crypto_device(uuid);
+ if (!d)
+ return log_oom();
+
+ r = filter_header_device(uuid_value, &headerdev, &filtered_headerdev_options);
+ if (r < 0)
+ return r;
+
+ free_and_replace(d->options, filtered_headerdev_options);
+ free_and_replace(d->headerdev, headerdev);
+ } else if (streq(key, "luks.key")) {
+ size_t n;
+ _cleanup_free_ char *keyfile = NULL, *keydev = NULL;
+ const char *keyspec;
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ n = strspn(value, ALPHANUMERICAL "-");
+ if (value[n] != '=')
+ return free_and_strdup_warn(&arg_default_keyfile, value);
+
+ uuid = strndup(value, n);
+ if (!uuid)
+ return log_oom();
+
+ if (warn_uuid_invalid(uuid, key))
+ return 0;
+
+ d = get_crypto_device(uuid);
+ if (!d)
+ return log_oom();
+
+ keyspec = value + n + 1;
+ r = split_locationspec(keyspec, &keyfile, &keydev);
+ if (r < 0)
+ return r;
+
+ free_and_replace(d->keyfile, keyfile);
+ free_and_replace(d->keydev, keydev);
+ } else if (streq(key, "luks.data")) {
+ size_t n;
+ _cleanup_free_ char *datadev = NULL;
+
+ if (proc_cmdline_value_missing(key, value))
+ return 0;
+
+ n = strspn(value, ALPHANUMERICAL "-");
+ if (value[n] != '=') {
+ log_warning("Failed to parse luks.data= kernel command line switch. UUID is invalid, ignoring.");
+ return 0;
+ }
+
+ uuid = strndup(value, n);
+ if (!uuid)
+ return log_oom();
+
+ if (warn_uuid_invalid(uuid, key))
+ return 0;
+
+ d = get_crypto_device(uuid);
+ if (!d)
+ return log_oom();
+
+ datadev = fstab_node_to_udev_node(value + n + 1);
+ if (!datadev)
+ return log_oom();
+
+ free_and_replace(d->datadev, datadev);
+ } 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_allow_list = 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;
+ int r;
+
+ if (!arg_read_crypttab)
+ return 0;
+
+ r = fopen_unlocked(arg_crypttab, "re", &f);
+ if (r < 0) {
+ if (errno != ENOENT)
+ log_error_errno(errno, "Failed to open %s: %m", arg_crypttab);
+ return 0;
+ }
+
+ for (;;) {
+ _cleanup_free_ char *line = NULL, *name = NULL, *device = NULL, *keyspec = NULL, *options = NULL,
+ *keyfile = NULL, *keydev = NULL, *headerdev = NULL, *filtered_header = 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 %s: %m", arg_crypttab);
+ 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, &keyspec, &options);
+ if (k < 2 || k > 4) {
+ log_error("Failed to parse %s:%u, ignoring.", arg_crypttab, 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_allow_list && !d) {
+ log_info("Not creating device '%s' because it was not specified on the kernel command line.", name);
+ continue;
+ }
+
+ r = split_locationspec(keyspec, &keyfile, &keydev);
+ if (r < 0)
+ return r;
+
+ if (options && (!d || !d->options)) {
+ r = filter_header_device(options, &headerdev, &filtered_header);
+ if (r < 0)
+ return r;
+ free_and_replace(options, filtered_header);
+ }
+
+ r = create_disk(name,
+ device,
+ keyfile,
+ keydev,
+ (d && d->options) ? d->headerdev : headerdev,
+ (d && d->options) ? d->options : options,
+ arg_crypttab);
+ if (r < 0)
+ return r;
+
+ if (d)
+ d->create = false;
+ }
+
+ return 0;
+}
+
+static int add_proc_cmdline_devices(void) {
+ int r;
+ crypto_device *d;
+
+ HASHMAP_FOREACH(d, arg_disks) {
+ _cleanup_free_ char *device = NULL;
+
+ if (!d->create)
+ continue;
+
+ if (!d->name) {
+ d->name = strjoin("luks-", d->uuid);
+ if (!d->name)
+ return log_oom();
+ }
+
+ device = strjoin("UUID=", d->uuid);
+ if (!device)
+ return log_oom();
+
+ r = create_disk(d->name,
+ d->datadev ?: device,
+ d->keyfile ?: arg_default_keyfile,
+ d->keydev,
+ d->headerdev,
+ d->options ?: arg_default_options,
+ "/proc/cmdline");
+ 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_crypttab = getenv("SYSTEMD_CRYPTTAB") ?: "/etc/crypttab";
+ arg_runtime_directory = getenv("RUNTIME_DIRECTORY") ?: "/run/systemd/cryptsetup";
+
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 03:34:12 +0000