Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ 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
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ 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 "log.h"
#include "util.h"
#include "unit-name.h"
+#include "mkdir.h"
+#include "strv.h"
+#include "fileio.h"
-const char *arg_dest = "/tmp";
+static const char *arg_dest = "/tmp";
+static bool arg_enabled = true;
+static bool arg_read_crypttab = true;
static bool has_option(const char *haystack, const char *needle) {
const char *f = haystack;
const char *password,
const char *options) {
- char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL;
- int r;
- FILE *f = NULL;
- bool noauto, nofail;
+ _cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ bool noauto, nofail, tmp, swap;
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 (!(n = unit_name_build_escape("cryptsetup", name, ".service"))) {
- r = -ENOMEM;
- log_error("Failed to allocate unit name.");
- goto fail;
+ if (tmp && swap) {
+ log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name);
+ return -EINVAL;
}
- if (asprintf(&p, "%s/%s", arg_dest, n) < 0) {
- r = -ENOMEM;
- log_error("Failed to allocate unit file name.");
- goto fail;
- }
+ n = unit_name_from_path_instance("systemd-cryptsetup", name, ".service");
+ if (!n)
+ return log_oom();
- if (!(u = fstab_node_to_udev_node(device))) {
- r = -ENOMEM;
- log_error("Failed to allocate device node.");
- goto fail;
- }
+ p = strjoin(arg_dest, "/", n, NULL);
+ if (!p)
+ return log_oom();
- if (!(d = unit_name_from_path(u, ".device"))) {
- r = -ENOMEM;
- log_error("Failed to allocate device name.");
- goto fail;
- }
+ u = fstab_node_to_udev_node(device);
+ if (!u)
+ return log_oom();
+
+ d = unit_name_from_path(u, ".device");
+ if (!d)
+ return log_oom();
- if (!(f = fopen(p, "wxe"))) {
- r = -errno;
- log_error("Failed to create unit file: %m");
- goto fail;
+ f = fopen(p, "wxe");
+ if (!f) {
+ log_error("Failed to create unit file %s: %m", p);
+ return -errno;
}
- fprintf(f,
+ fputs(
+ "# Automatically generated by systemd-cryptsetup-generator\n\n"
"[Unit]\n"
- "Description=Cryptography Setup for %%I\n"
+ "Description=Cryptography Setup for %I\n"
+ "Documentation=man:systemd-cryptsetup@.service(8) man:crypttab(5)\n"
+ "SourcePath=/etc/crypttab\n"
"Conflicts=umount.target\n"
"DefaultDependencies=no\n"
- "BindTo=%s dev-mapper-%%i.device\n"
- "After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n"
- "Before=umount.target\n",
- d, d);
+ "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 && (streq(password, "/dev/urandom") ||
- streq(password, "/dev/random") ||
- streq(password, "/dev/hw_random")))
+ if (password) {
+ if (streq(password, "/dev/urandom") ||
+ streq(password, "/dev/random") ||
+ streq(password, "/dev/hw_random"))
+ fputs("After=systemd-random-seed.service\n", f);
+ else if (!streq(password, "-") &&
+ !streq(password, "none"))
+ fprintf(f,
+ "RequiresMountsFor=%s\n",
+ password);
+ }
+
+ if (is_device_path(u))
fprintf(f,
- "After=systemd-random-seed-load.service\n");
+ "BindsTo=%s\n"
+ "After=%s\n"
+ "Before=umount.target\n",
+ d, d);
else
fprintf(f,
- "Before=local-fs.target\n");
+ "RequiresMountsFor=%s\n",
+ u);
fprintf(f,
"\n[Service]\n"
name, u, strempty(password), strempty(options),
name);
- if (has_option(options, "tmp"))
+ if (tmp)
fprintf(f,
"ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
name);
- if (has_option(options, "swap"))
+ if (swap)
fprintf(f,
"ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
name);
fflush(f);
if (ferror(f)) {
- r = -errno;
- log_error("Failed to write file: %m");
- goto fail;
+ log_error("Failed to write file %s: %m", p);
+ return -errno;
}
- if (asprintf(&from, "../%s", n) < 0) {
- r = -ENOMEM;
- goto fail;
- }
+ if (asprintf(&from, "../%s", n) < 0)
+ return log_oom();
if (!noauto) {
- if (asprintf(&to, "%s/%s.wants/%s", arg_dest, d, n) < 0) {
- r = -ENOMEM;
- goto fail;
- }
-
- mkdir_parents(to, 0755);
+ 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' to '%s': %m", from, to);
- r = -errno;
- goto fail;
+ log_error("Failed to create symlink %s: %m", to);
+ return -errno;
}
free(to);
- to = NULL;
-
if (!nofail)
- asprintf(&to, "%s/cryptsetup.target.requires/%s", arg_dest, n);
+ to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL);
else
- asprintf(&to, "%s/cryptsetup.target.wants/%s", arg_dest, n);
-
- if (!to) {
- r = -ENOMEM;
- goto fail;
- }
-
- mkdir_parents(to, 0755);
+ 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' to '%s': %m", from, to);
- r = -errno;
- goto fail;
+ log_error("Failed to create symlink %s: %m", to);
+ return -errno;
}
}
- free(to);
- to = NULL;
-
e = unit_name_escape(name);
- if (asprintf(&to, "%s/dev-mapper-%s.device.requires/%s", arg_dest, e, n) < 0) {
- r = -ENOMEM;
- goto fail;
- }
+ if (!e)
+ return log_oom();
- mkdir_parents(to, 0755);
+ 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' to '%s': %m", from, to);
- r = -errno;
- goto fail;
+ log_error("Failed to create symlink %s: %m", to);
+ return -errno;
}
- r = 0;
+ if (!noauto && !nofail) {
+ int r;
+ 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)
+ return r;
+ }
-fail:
- free(p);
- free(n);
- free(d);
- free(e);
+ return 0;
+}
- free(from);
- free(to);
+static int parse_proc_cmdline(
+ char ***arg_proc_cmdline_disks,
+ char ***arg_proc_cmdline_options,
+ char **arg_proc_cmdline_keyfile) {
- if (f)
- fclose(f);
+ _cleanup_free_ char *line = NULL;
+ char *w = NULL, *state = NULL;
+ size_t l;
+ int r;
- return r;
+ r = proc_cmdline(&line);
+ if (r < 0)
+ log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
+ if (r <= 0)
+ return 0;
+
+ FOREACH_WORD_QUOTED(w, l, line, state) {
+ _cleanup_free_ char *word = NULL;
+
+ word = strndup(w, l);
+ if (!word)
+ return log_oom();
+
+ if (startswith(word, "luks=")) {
+ r = parse_boolean(word + 5);
+ if (r < 0)
+ log_warning("Failed to parse luks switch %s. Ignoring.", word + 5);
+ else
+ arg_enabled = r;
+
+ } else if (startswith(word, "rd.luks=")) {
+
+ if (in_initrd()) {
+ r = parse_boolean(word + 8);
+ if (r < 0)
+ log_warning("Failed to parse luks switch %s. Ignoring.", word + 8);
+ else
+ arg_enabled = r;
+ }
+
+ } else if (startswith(word, "luks.crypttab=")) {
+ r = parse_boolean(word + 14);
+ if (r < 0)
+ log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word + 14);
+ else
+ arg_read_crypttab = r;
+
+ } else if (startswith(word, "rd.luks.crypttab=")) {
+
+ if (in_initrd()) {
+ r = parse_boolean(word + 17);
+ if (r < 0)
+ log_warning("Failed to parse luks crypttab switch %s. Ignoring.", word + 17);
+ else
+ arg_read_crypttab = r;
+ }
+
+ } else if (startswith(word, "luks.uuid=")) {
+ if (strv_extend(arg_proc_cmdline_disks, word + 10) < 0)
+ return log_oom();
+
+ } else if (startswith(word, "rd.luks.uuid=")) {
+
+ if (in_initrd()) {
+ if (strv_extend(arg_proc_cmdline_disks, word + 13) < 0)
+ return log_oom();
+ }
+
+ } else if (startswith(word, "luks.options=")) {
+ if (strv_extend(arg_proc_cmdline_options, word + 13) < 0)
+ return log_oom();
+
+ } else if (startswith(word, "rd.luks.options=")) {
+
+ if (in_initrd()) {
+ if (strv_extend(arg_proc_cmdline_options, word + 16) < 0)
+ return log_oom();
+ }
+
+ } else if (startswith(word, "luks.key=")) {
+ if (*arg_proc_cmdline_keyfile)
+ free(*arg_proc_cmdline_keyfile);
+ *arg_proc_cmdline_keyfile = strdup(word + 9);
+ if (!*arg_proc_cmdline_keyfile)
+ return log_oom();
+
+ } else if (startswith(word, "rd.luks.key=")) {
+
+ if (in_initrd()) {
+ if (*arg_proc_cmdline_keyfile)
+ free(*arg_proc_cmdline_keyfile);
+ *arg_proc_cmdline_keyfile = strdup(word + 12);
+ if (!*arg_proc_cmdline_keyfile)
+ return log_oom();
+ }
+
+ } else if (startswith(word, "luks.") ||
+ (in_initrd() && startswith(word, "rd.luks."))) {
+
+ log_warning("Unknown kernel switch %s. Ignoring.", word);
+ }
+ }
+
+ strv_uniq(*arg_proc_cmdline_disks);
+
+ return 0;
}
int main(int argc, char *argv[]) {
- FILE *f;
- int r = EXIT_SUCCESS;
+ _cleanup_strv_free_ char **arg_proc_cmdline_disks_done = NULL;
+ _cleanup_strv_free_ char **arg_proc_cmdline_disks = NULL;
+ _cleanup_strv_free_ char **arg_proc_cmdline_options = NULL;
+ _cleanup_free_ char *arg_proc_cmdline_keyfile = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
unsigned n = 0;
+ int r = EXIT_SUCCESS;
+ char **i;
- if (argc > 2) {
- log_error("This program takes one or no arguments.");
+ 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_SYSLOG_OR_KMSG);
+ log_set_target(LOG_TARGET_SAFE);
log_parse_environment();
log_open();
umask(0022);
- if (!(f = fopen("/etc/crypttab", "re"))) {
+ if (parse_proc_cmdline(&arg_proc_cmdline_disks, &arg_proc_cmdline_options, &arg_proc_cmdline_keyfile) < 0)
+ return EXIT_FAILURE;
+
+ if (!arg_enabled)
+ return EXIT_SUCCESS;
+
+ if (arg_read_crypttab) {
+ struct stat st;
- if (errno == ENOENT)
- r = EXIT_SUCCESS;
- else {
+ f = fopen("/etc/crypttab", "re");
+ if (!f) {
+ if (errno == ENOENT)
+ r = EXIT_SUCCESS;
+ else {
+ r = EXIT_FAILURE;
+ log_error("Failed to open /etc/crypttab: %m");
+ }
+
+ goto next;
+ }
+
+ if (fstat(fileno(f), &st) < 0) {
+ log_error("Failed to stat /etc/crypttab: %m");
r = EXIT_FAILURE;
- log_error("Failed to open /etc/crypttab: %m");
+ goto next;
}
- goto finish;
+ /* 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);
+ r = EXIT_FAILURE;
+ continue;
+ }
+
+ if (arg_proc_cmdline_options) {
+ /*
+ If options are specified on the kernel commandline, let them override
+ the ones from crypttab.
+ */
+ STRV_FOREACH(i, arg_proc_cmdline_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)) {
+ if (options)
+ free(options);
+ options = strdup(p);
+ if (!proc_options)
+ return log_oom();
+ }
+ }
+ }
+
+ if (arg_proc_cmdline_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_proc_cmdline_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)
+ return log_oom();
+
+ if (streq(proc_device, device) || streq(proc_name, name)) {
+ if (create_disk(name, device, password, options) < 0)
+ r = EXIT_FAILURE;
+
+ if (strv_extend(&arg_proc_cmdline_disks_done, p) < 0)
+ return log_oom();
+ }
+ }
+ } else {
+ if (create_disk(name, device, password, options) < 0)
+ r = EXIT_FAILURE;
+ }
+ }
}
- for (;;) {
- char line[LINE_MAX], *l;
- char *name = NULL, *device = NULL, *password = NULL, *options = NULL;
- int k;
+next:
+ STRV_FOREACH(i, arg_proc_cmdline_disks) {
+ /*
+ Generate units for those UUIDs, which were specified
+ on the kernel command line and not yet written.
+ */
- if (!(fgets(line, sizeof(line), f)))
- break;
+ _cleanup_free_ char *name = NULL, *device = NULL, *options = NULL;
+ const char *p = *i;
- n++;
+ if (startswith(p, "luks-"))
+ p += 5;
- l = strstrip(line);
- if (*l == '#' || *l == 0)
+ if (strv_contains(arg_proc_cmdline_disks_done, p))
continue;
- if ((k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options)) < 2 || k > 4) {
- log_error("Failed to parse /etc/crypttab:%u, ignoring.", n);
- r = EXIT_FAILURE;
- goto next;
+ name = strappend("luks-", p);
+ device = strappend("UUID=", p);
+
+ if (!name || !device)
+ return log_oom();
+
+ if (arg_proc_cmdline_options) {
+ /*
+ If options are specified on the kernel commandline, use them.
+ */
+ char **j;
+
+ STRV_FOREACH(j, arg_proc_cmdline_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)) {
+ if (options)
+ free(options);
+ options = strdup(proc_options);
+ if (!options)
+ return log_oom();
+ }
+ } else if (!options) {
+ /*
+ Fall back to options without a specified UUID
+ */
+ options = strdup(s);
+ if (!options)
+ return log_oom();
+ }
+ }
}
- if (create_disk(name, device, password, options) < 0)
- r = EXIT_FAILURE;
+ if (!options) {
+ options = strdup("timeout=0");
+ if (!options)
+ return log_oom();
+ }
- next:
- free(name);
- free(device);
- free(password);
- free(options);
+ if (create_disk(name, device, arg_proc_cmdline_keyfile, options) < 0)
+ r = EXIT_FAILURE;
}
-finish:
return r;
}