6b000af4f2
https://tools.ietf.org/html/draft-knodel-terminology-02 https://lwn.net/Articles/823224/ This gets rid of most but not occasions of these loaded terms: 1. scsi_id and friends are something that is supposed to be removed from our tree (see #7594) 2. The test suite defines an API used by the ubuntu CI. We can remove this too later, but this needs to be done in sync with the ubuntu CI. 3. In some cases the terms are part of APIs we call or where we expose concepts the kernel names the way it names them. (In particular all remaining uses of the word "slave" in our codebase are like this, it's used by the POSIX PTY layer, by the network subsystem, the mount API and the block device subsystem). Getting rid of the term in these contexts would mean doing some major fixes of the kernel ABI first. Regarding the replacements: when whitelist/blacklist is used as noun we replace with with allow list/deny list, and when used as verb with allow-list/deny-list.
712 lines
24 KiB
C
712 lines
24 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "alloc-util.h"
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#include "dropin.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fstab-util.h"
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#include "generator.h"
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#include "hashmap.h"
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#include "id128-util.h"
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#include "log.h"
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#include "mkdir.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "proc-cmdline.h"
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#include "specifier.h"
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#include "string-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "util.h"
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typedef struct crypto_device {
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char *uuid;
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char *keyfile;
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char *keydev;
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char *name;
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char *options;
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bool create;
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} crypto_device;
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static const char *arg_dest = NULL;
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static bool arg_enabled = true;
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static bool arg_read_crypttab = true;
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static const char *arg_crypttab = NULL;
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static const char *arg_runtime_directory = NULL;
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static bool arg_allow_list = false;
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static Hashmap *arg_disks = NULL;
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static char *arg_default_options = NULL;
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static char *arg_default_keyfile = NULL;
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STATIC_DESTRUCTOR_REGISTER(arg_disks, hashmap_freep);
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STATIC_DESTRUCTOR_REGISTER(arg_default_options, freep);
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STATIC_DESTRUCTOR_REGISTER(arg_default_keyfile, freep);
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static int split_keyspec(const char *keyspec, char **ret_keyfile, char **ret_keydev) {
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_cleanup_free_ char *keyfile = NULL, *keydev = NULL;
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const char *c;
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assert(ret_keyfile);
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assert(ret_keydev);
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if (!keyspec) {
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*ret_keyfile = *ret_keydev = NULL;
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return 0;
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}
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c = strrchr(keyspec, ':');
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if (c) {
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/* The keydev part has to be either an absolute path to device node (/dev/something,
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* /dev/foo/something, or even possibly /dev/foo/something:part), or a fstab device
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* specification starting with LABEL= or similar. The keyfile part has the same syntax.
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*
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* Let's try to guess if the second part looks like a keydev specification, or just part of a
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* filename with a colon. fstab_node_to_udev_node() will convert the fstab device syntax to
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* an absolute path. If we didn't get an absolute path, assume that it is just part of the
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* first keyfile argument. */
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keydev = fstab_node_to_udev_node(c + 1);
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if (!keydev)
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return log_oom();
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if (path_is_absolute(keydev))
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keyfile = strndup(keyspec, c-keyspec);
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else {
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log_debug("Keyspec argument contains a colon, but \"%s\" doesn't look like a device specification.\n"
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"Assuming that \"%s\" is a single device specification.",
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c + 1, keyspec);
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keydev = mfree(keydev);
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c = NULL;
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}
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}
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if (!c)
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/* No keydev specified */
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keyfile = strdup(keyspec);
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if (!keyfile)
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return log_oom();
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*ret_keyfile = TAKE_PTR(keyfile);
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*ret_keydev = TAKE_PTR(keydev);
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return 0;
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}
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static int generate_keydev_mount(
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const char *name,
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const char *keydev,
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const char *keydev_timeout,
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bool canfail,
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char **unit,
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char **mount) {
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_cleanup_free_ char *u = NULL, *where = NULL, *name_escaped = NULL, *device_unit = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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usec_t timeout_us;
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assert(name);
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assert(keydev);
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assert(unit);
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assert(mount);
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r = mkdir_parents(arg_runtime_directory, 0755);
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if (r < 0)
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return r;
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r = mkdir(arg_runtime_directory, 0700);
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if (r < 0 && errno != EEXIST)
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return -errno;
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name_escaped = cescape(name);
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if (!name_escaped)
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return -ENOMEM;
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where = strjoin(arg_runtime_directory, "/keydev-", name_escaped);
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if (!where)
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return -ENOMEM;
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r = mkdir(where, 0700);
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if (r < 0 && errno != EEXIST)
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return -errno;
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r = unit_name_from_path(where, ".mount", &u);
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if (r < 0)
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return r;
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r = generator_open_unit_file(arg_dest, NULL, u, &f);
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if (r < 0)
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return r;
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fprintf(f,
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"[Unit]\n"
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"DefaultDependencies=no\n\n"
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"[Mount]\n"
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"What=%s\n"
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"Where=%s\n"
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"Options=ro%s\n", keydev, where, canfail ? ",nofail" : "");
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if (keydev_timeout) {
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r = parse_sec_fix_0(keydev_timeout, &timeout_us);
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if (r >= 0) {
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r = unit_name_from_path(keydev, ".device", &device_unit);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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r = write_drop_in_format(arg_dest, device_unit, 90, "device-timeout",
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"# Automatically generated by systemd-cryptsetup-generator \n\n"
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"[Unit]\nJobRunningTimeoutSec=%s", keydev_timeout);
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if (r < 0)
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return log_error_errno(r, "Failed to write device drop-in: %m");
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} else
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log_warning_errno(r, "Failed to parse %s, ignoring: %m", keydev_timeout);
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}
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r = fflush_and_check(f);
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if (r < 0)
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return r;
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*unit = TAKE_PTR(u);
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*mount = TAKE_PTR(where);
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return 0;
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}
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static int print_dependencies(FILE *f, const char* device_path) {
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int r;
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if (STR_IN_SET(device_path, "-", "none"))
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/* None, nothing to do */
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return 0;
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if (PATH_IN_SET(device_path,
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"/dev/urandom",
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"/dev/random",
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"/dev/hw_random",
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"/dev/hwrng")) {
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/* RNG device, add random dep */
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fputs("After=systemd-random-seed.service\n", f);
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return 0;
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}
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_cleanup_free_ char *udev_node = fstab_node_to_udev_node(device_path);
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if (!udev_node)
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return log_oom();
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if (path_equal(udev_node, "/dev/null"))
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return 0;
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if (path_startswith(udev_node, "/dev/")) {
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/* We are dealing with a block device, add dependency for corresponding unit */
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_cleanup_free_ char *unit = NULL;
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r = unit_name_from_path(udev_node, ".device", &unit);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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fprintf(f,
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"After=%1$s\n"
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"Requires=%1$s\n", unit);
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} else {
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/* Regular file, add mount dependency */
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_cleanup_free_ char *escaped_path = specifier_escape(device_path);
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if (!escaped_path)
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return log_oom();
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fprintf(f, "RequiresMountsFor=%s\n", escaped_path);
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}
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return 0;
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}
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static int create_disk(
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const char *name,
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const char *device,
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const char *password,
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const char *keydev,
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const char *options) {
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_cleanup_free_ char *n = NULL, *d = NULL, *u = NULL, *e = NULL,
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*keydev_mount = NULL, *keyfile_timeout_value = NULL,
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*filtered = NULL, *u_escaped = NULL, *name_escaped = NULL, *header_path = NULL, *password_buffer = NULL,
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*tmp_fstype = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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const char *dmname;
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bool noauto, nofail, swap, netdev, attach_in_initrd;
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int r, detached_header, keyfile_can_timeout, tmp;
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assert(name);
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assert(device);
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noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0");
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nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0");
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swap = fstab_test_option(options, "swap\0");
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netdev = fstab_test_option(options, "_netdev\0");
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attach_in_initrd = fstab_test_option(options, "x-initrd.attach\0");
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keyfile_can_timeout = fstab_filter_options(options, "keyfile-timeout\0", NULL, &keyfile_timeout_value, NULL);
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if (keyfile_can_timeout < 0)
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return log_error_errno(keyfile_can_timeout, "Failed to parse keyfile-timeout= option value: %m");
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detached_header = fstab_filter_options(options, "header\0", NULL, &header_path, NULL);
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if (detached_header < 0)
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return log_error_errno(detached_header, "Failed to parse header= option value: %m");
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tmp = fstab_filter_options(options, "tmp\0", NULL, &tmp_fstype, NULL);
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if (tmp < 0)
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return log_error_errno(tmp, "Failed to parse tmp= option value: %m");
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if (tmp && swap)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.",
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name);
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name_escaped = specifier_escape(name);
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if (!name_escaped)
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return log_oom();
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e = unit_name_escape(name);
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if (!e)
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return log_oom();
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u = fstab_node_to_udev_node(device);
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if (!u)
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return log_oom();
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r = unit_name_build("systemd-cryptsetup", e, ".service", &n);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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u_escaped = specifier_escape(u);
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if (!u_escaped)
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return log_oom();
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r = unit_name_from_path(u, ".device", &d);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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if (keydev && !password)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Key device is specified, but path to the password file is missing.");
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r = generator_open_unit_file(arg_dest, NULL, n, &f);
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if (r < 0)
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return r;
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r = generator_write_cryptsetup_unit_section(f, arg_crypttab);
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if (r < 0)
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return r;
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if (netdev)
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fprintf(f, "After=remote-fs-pre.target\n");
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/* If initrd takes care of attaching the disk then it should also detach it during shutdown. */
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if (!attach_in_initrd)
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fprintf(f, "Conflicts=umount.target\n");
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if (keydev) {
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_cleanup_free_ char *unit = NULL;
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r = generate_keydev_mount(name, keydev, keyfile_timeout_value, keyfile_can_timeout > 0, &unit, &keydev_mount);
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if (r < 0)
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return log_error_errno(r, "Failed to generate keydev mount unit: %m");
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password_buffer = path_join(keydev_mount, password);
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if (!password_buffer)
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return log_oom();
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password = password_buffer;
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fprintf(f, "After=%s\n", unit);
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if (keyfile_can_timeout > 0)
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fprintf(f, "Wants=%s\n", unit);
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else
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fprintf(f, "Requires=%s\n", unit);
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}
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if (!nofail)
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fprintf(f,
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"Before=%s\n",
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netdev ? "remote-cryptsetup.target" : "cryptsetup.target");
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if (password && !keydev) {
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r = print_dependencies(f, password);
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if (r < 0)
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return r;
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}
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/* Check if a header option was specified */
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if (detached_header > 0) {
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r = print_dependencies(f, header_path);
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if (r < 0)
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return r;
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}
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if (path_startswith(u, "/dev/"))
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fprintf(f,
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"BindsTo=%s\n"
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"After=%s\n"
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"Before=umount.target\n",
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d, d);
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else
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/* For loopback devices, add systemd-tmpfiles-setup-dev.service
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dependency to ensure that loopback support is available in
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the kernel (/dev/loop-control needs to exist) */
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fprintf(f,
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"RequiresMountsFor=%s\n"
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"Requires=systemd-tmpfiles-setup-dev.service\n"
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"After=systemd-tmpfiles-setup-dev.service\n",
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u_escaped);
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r = generator_write_timeouts(arg_dest, device, name, options, &filtered);
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if (r < 0)
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log_warning_errno(r, "Failed to write device timeout drop-in: %m");
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r = generator_write_cryptsetup_service_section(f, name, u, password, filtered);
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if (r < 0)
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return r;
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if (tmp) {
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_cleanup_free_ char *tmp_fstype_escaped = NULL;
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if (tmp_fstype) {
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tmp_fstype_escaped = specifier_escape(tmp_fstype);
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if (!tmp_fstype_escaped)
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return log_oom();
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}
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fprintf(f,
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"ExecStartPost=" ROOTLIBEXECDIR "/systemd-makefs '%s' '/dev/mapper/%s'\n",
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tmp_fstype_escaped ?: "ext4", name_escaped);
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}
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if (swap)
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fprintf(f,
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"ExecStartPost=" ROOTLIBEXECDIR "/systemd-makefs swap '/dev/mapper/%s'\n",
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name_escaped);
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if (keydev)
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fprintf(f,
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"ExecStartPost=-" UMOUNT_PATH " %s\n\n",
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keydev_mount);
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r = fflush_and_check(f);
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if (r < 0)
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return log_error_errno(r, "Failed to write unit file %s: %m", n);
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if (!noauto) {
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r = generator_add_symlink(arg_dest,
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netdev ? "remote-cryptsetup.target" : "cryptsetup.target",
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nofail ? "wants" : "requires", n);
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if (r < 0)
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return r;
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}
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dmname = strjoina("dev-mapper-", e, ".device");
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r = generator_add_symlink(arg_dest, dmname, "requires", n);
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if (r < 0)
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return r;
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if (!noauto && !nofail) {
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r = write_drop_in(arg_dest, dmname, 40, "device-timeout",
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"# Automatically generated by systemd-cryptsetup-generator\n\n"
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"[Unit]\nJobTimeoutSec=0");
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if (r < 0)
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log_warning_errno(r, "Failed to write device timeout drop-in: %m");
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}
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return 0;
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}
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static crypto_device* crypt_device_free(crypto_device *d) {
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if (!d)
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return NULL;
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free(d->uuid);
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free(d->keyfile);
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free(d->keydev);
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free(d->name);
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free(d->options);
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return mfree(d);
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}
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static crypto_device *get_crypto_device(const char *uuid) {
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int r;
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crypto_device *d;
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assert(uuid);
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d = hashmap_get(arg_disks, uuid);
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if (!d) {
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d = new0(struct crypto_device, 1);
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if (!d)
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return NULL;
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d->uuid = strdup(uuid);
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if (!d->uuid)
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return mfree(d);
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r = hashmap_put(arg_disks, d->uuid, d);
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if (r < 0) {
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free(d->uuid);
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return mfree(d);
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}
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}
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return d;
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}
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static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
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_cleanup_free_ char *uuid = NULL, *uuid_value = NULL;
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crypto_device *d;
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int r;
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if (streq(key, "luks")) {
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r = value ? parse_boolean(value) : 1;
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if (r < 0)
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log_warning("Failed to parse luks= kernel command line switch %s. Ignoring.", value);
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else
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arg_enabled = r;
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} else if (streq(key, "luks.crypttab")) {
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r = value ? parse_boolean(value) : 1;
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if (r < 0)
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log_warning("Failed to parse luks.crypttab= kernel command line switch %s. Ignoring.", value);
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else
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arg_read_crypttab = r;
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} else if (streq(key, "luks.uuid")) {
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if (proc_cmdline_value_missing(key, value))
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return 0;
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d = get_crypto_device(startswith(value, "luks-") ? value+5 : value);
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if (!d)
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return log_oom();
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d->create = arg_allow_list = true;
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} else if (streq(key, "luks.options")) {
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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;
|
|
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;
|
|
r = split_keyspec(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.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;
|
|
struct stat st;
|
|
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;
|
|
}
|
|
|
|
if (fstat(fileno(f), &st) < 0) {
|
|
log_error_errno(errno, "Failed to stat %s: %m", arg_crypttab);
|
|
return 0;
|
|
}
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *line = NULL, *name = NULL, *device = NULL, *keyspec = NULL, *options = NULL, *keyfile = NULL, *keydev = 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_keyspec(keyspec, &keyfile, &keydev);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = create_disk(name, device, keyfile, keydev, (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) {
|
|
_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,
|
|
device,
|
|
d->keyfile ?: arg_default_keyfile,
|
|
d->keydev,
|
|
d->options ?: arg_default_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_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);
|