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-rw-r--r--man/systemd-cryptsetup-generator.xml9
-rw-r--r--src/cryptsetup/cryptsetup-generator.c380
2 files changed, 199 insertions, 190 deletions
diff --git a/man/systemd-cryptsetup-generator.xml b/man/systemd-cryptsetup-generator.xml
index 3abb39d550..ff94e88f99 100644
--- a/man/systemd-cryptsetup-generator.xml
+++ b/man/systemd-cryptsetup-generator.xml
@@ -120,7 +120,7 @@
activate the specified device as part
of the boot process as if it was
listed in
- <filename>/etc/fstab</filename>. This
+ <filename>/etc/crypttab</filename>. This
option may be specified more than once
in order to set up multiple
devices. <varname>rd.luks.uuid=</varname>
@@ -130,9 +130,10 @@
honored by both the main system and
the initrd.</para>
<para>If /etc/crypttab contains entries with
- the same UUID, then the options for this entry
- will be used.</para>
- <para>If /etc/crypttab exists, only those UUID
+ the same UUID, then the name, keyfile and options
+ specified there will be used. Otherwise the device
+ will have the name <literal>luks-UUID</literal>.</para>
+ <para>If /etc/crypttab exists, only those UUIDs
specified on the kernel command line
will be activated in the initrd or the real root.</para>
</listitem>
diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c
index 45c23bb323..c1581ef9c8 100644
--- a/src/cryptsetup/cryptsetup-generator.c
+++ b/src/cryptsetup/cryptsetup-generator.c
@@ -19,26 +19,34 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <string.h>
#include <errno.h>
+#include <string.h>
#include <unistd.h>
+#include "dropin.h"
+#include "fileio.h"
+#include "generator.h"
+#include "hashmap.h"
#include "log.h"
-#include "util.h"
-#include "unit-name.h"
#include "mkdir.h"
-#include "strv.h"
-#include "fileio.h"
#include "path-util.h"
-#include "dropin.h"
-#include "generator.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "util.h"
+
+typedef struct crypto_device {
+ char *uuid;
+ char *options;
+ bool create;
+} crypto_device;
static const char *arg_dest = "/tmp";
static bool arg_enabled = true;
static bool arg_read_crypttab = true;
-static char **arg_disks = NULL;
-static char **arg_options = NULL;
-static char *arg_keyfile = NULL;
+static bool arg_whitelist = false;
+static Hashmap *arg_disks = NULL;
+static char *arg_default_options = NULL;
+static char *arg_default_keyfile = NULL;
static bool has_option(const char *haystack, const char *needle) {
const char *f = haystack;
@@ -251,8 +259,54 @@ static int create_disk(
return 0;
}
+static void free_arg_disks(void) {
+ crypto_device *d;
+
+ while ((d = hashmap_steal_first(arg_disks))) {
+ free(d->uuid);
+ free(d->options);
+ free(d);
+ }
+
+ hashmap_free(arg_disks);
+}
+
+static crypto_device *get_crypto_device(const char *uuid) {
+ int r;
+ crypto_device *d;
+
+ assert(uuid);
+
+ d = hashmap_get(arg_disks, uuid);
+ if (!d) {
+ d = new0(struct crypto_device, 1);
+ if (!d)
+ return NULL;
+
+ d->create = false;
+ d->options = NULL;
+
+ d->uuid = strdup(uuid);
+ if (!d->uuid) {
+ free(d);
+ return NULL;
+ }
+
+ r = hashmap_put(arg_disks, d->uuid, d);
+ if (r < 0) {
+ free(d->uuid);
+ free(d);
+ return NULL;
+ }
+ }
+
+ return d;
+}
+
static int parse_proc_cmdline_item(const char *key, const char *value) {
int r;
+ crypto_device *d;
+ _cleanup_free_ char *uuid = NULL, *uuid_value = NULL;
if (STR_IN_SET(key, "luks", "rd.luks") && value) {
@@ -272,19 +326,29 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
} else if (STR_IN_SET(key, "luks.uuid", "rd.luks.uuid") && value) {
- if (strv_extend(&arg_disks, value) < 0)
+ d = get_crypto_device(startswith(value, "luks-") ? value+5 : value);
+ if (!d)
return log_oom();
+ d->create = arg_whitelist = true;
+
} else if (STR_IN_SET(key, "luks.options", "rd.luks.options") && value) {
- if (strv_extend(&arg_options, value) < 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(d->options);
+ d->options = uuid_value;
+ uuid_value = NULL;
+ } else if (free_and_strdup(&arg_default_options, value) < 0)
return log_oom();
} else if (STR_IN_SET(key, "luks.key", "rd.luks.key") && value) {
- free(arg_keyfile);
- arg_keyfile = strdup(value);
- if (!arg_keyfile)
+ if (free_and_strdup(&arg_default_keyfile, value))
return log_oom();
}
@@ -292,213 +356,157 @@ static int parse_proc_cmdline_item(const char *key, const char *value) {
return 0;
}
-int main(int argc, char *argv[]) {
- _cleanup_strv_free_ char **disks_done = NULL;
+static int add_crypttab_devices(void) {
+ struct stat st;
+ unsigned crypttab_line = 0;
_cleanup_fclose_ FILE *f = NULL;
- unsigned n = 0;
- int r = EXIT_FAILURE, r2 = EXIT_FAILURE, z;
- char **i;
- if (argc > 1 && argc != 4) {
- log_error("This program takes three or no arguments.");
- return EXIT_FAILURE;
+ if (!arg_read_crypttab)
+ return 0;
+
+ f = fopen("/etc/crypttab", "re");
+ if (!f) {
+ if (errno != ENOENT)
+ log_error_errno(errno, "Failed to open /etc/crypttab: %m");
+ return 0;
}
- if (argc > 1)
- arg_dest = argv[1];
+ if (fstat(fileno(f), &st) < 0) {
+ log_error_errno(errno, "Failed to stat /etc/crypttab: %m");
+ return 0;
+ }
- log_set_target(LOG_TARGET_SAFE);
- log_parse_environment();
- log_open();
+ /* If we readd support for specifying passphrases
+ * directly in crypttab 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.");
- umask(0022);
+ for (;;) {
+ int r, k;
+ char line[LINE_MAX], *l, *uuid;
+ crypto_device *d = NULL;
+ _cleanup_free_ char *name = NULL, *device = NULL, *keyfile = NULL, *options = NULL;
- z = parse_proc_cmdline(parse_proc_cmdline_item);
- if (z < 0)
- log_warning_errno(z, "Failed to parse kernel command line, ignoring: %m");
+ if (!fgets(line, sizeof(line), f))
+ break;
- if (!arg_enabled) {
- r = r2 = EXIT_SUCCESS;
- goto cleanup;
- }
+ crypttab_line++;
- strv_uniq(arg_disks);
+ l = strstrip(line);
+ if (*l == '#' || *l == 0)
+ continue;
- if (arg_read_crypttab) {
- struct stat st;
+ 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;
+ }
- f = fopen("/etc/crypttab", "re");
- if (!f) {
- if (errno == ENOENT)
- r = EXIT_SUCCESS;
- else
- log_error_errno(errno, "Failed to open /etc/crypttab: %m");
+ 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);
- goto next;
+ if (arg_whitelist && !d) {
+ log_info("Not creating device '%s' because it was not specified on the kernel command line.", name);
+ continue;
}
- if (fstat(fileno(f), &st) < 0) {
- log_error_errno(errno, "Failed to stat /etc/crypttab: %m");
- goto next;
- }
+ r = create_disk(name, device, keyfile, (d && d->options) ? d->options : options);
+ if (r < 0)
+ return r;
- /* 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.");
+ if (d)
+ d->create = false;
+ }
- for (;;) {
- char line[LINE_MAX], *l;
- _cleanup_free_ char *name = NULL, *device = NULL, *password = NULL, *options = NULL;
- int k;
+ return 0;
+}
- if (!fgets(line, sizeof(line), f))
- break;
+static int add_proc_cmdline_devices(void) {
+ int r;
+ Iterator i;
+ crypto_device *d;
- n++;
+ HASHMAP_FOREACH(d, arg_disks, i) {
+ const char *options;
+ _cleanup_free_ char *name = NULL, *device = NULL;
- l = strstrip(line);
- if (*l == '#' || *l == 0)
- continue;
+ if (!d->create)
+ 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);
- continue;
- }
+ name = strappend("luks-", d->uuid);
+ if (!name)
+ return log_oom();
- /*
- If options are specified on the kernel command line, let them override
- the ones from crypttab.
- */
- STRV_FOREACH(i, arg_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)) {
- free(options);
- options = strdup(p);
- if (!options) {
- log_oom();
- goto cleanup;
- }
- }
- }
+ device = strappend("UUID=", d->uuid);
+ if (!device)
+ return log_oom();
- if (arg_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_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) {
- log_oom();
- goto cleanup;
- }
-
- if (streq(proc_device, device) || streq(proc_name, name)) {
- if (create_disk(name, device, password, options) < 0)
- goto cleanup;
-
- if (strv_extend(&disks_done, p) < 0) {
- log_oom();
- goto cleanup;
- }
- }
- }
- } else if (create_disk(name, device, password, options) < 0)
- goto cleanup;
+ if (d->options)
+ options = d->options;
+ else if (arg_default_options)
+ options = arg_default_options;
+ else
+ options = "timeout=0";
- }
+ r = create_disk(name, device, arg_default_keyfile, options);
+ if (r < 0)
+ return r;
}
- r = EXIT_SUCCESS;
-
-next:
- STRV_FOREACH(i, arg_disks) {
- /*
- Generate units for those UUIDs, which were specified
- on the kernel command line and not yet written.
- */
+ return 0;
+}
- _cleanup_free_ char *name = NULL, *device = NULL, *options = NULL;
- const char *p = *i;
+int main(int argc, char *argv[]) {
+ int r = EXIT_FAILURE;
- if (startswith(p, "luks-"))
- p += 5;
+ if (argc > 1 && argc != 4) {
+ log_error("This program takes three or no arguments.");
+ return EXIT_FAILURE;
+ }
- if (strv_contains(disks_done, p))
- continue;
+ if (argc > 1)
+ arg_dest = argv[1];
- name = strappend("luks-", p);
- device = strappend("UUID=", p);
+ log_set_target(LOG_TARGET_SAFE);
+ log_parse_environment();
+ log_open();
- if (!name || !device) {
- log_oom();
- goto cleanup;
- }
+ umask(0022);
- if (arg_options) {
- /*
- If options are specified on the kernel command line, use them.
- */
- char **j;
-
- STRV_FOREACH(j, arg_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)) {
- free(options);
- options = proc_options;
- proc_options = NULL;
- }
- } else if (!options) {
- /*
- Fall back to options without a specified UUID
- */
- options = strdup(s);
- if (!options) {
- log_oom();
- goto cleanup;
- };
- }
- }
- }
+ arg_disks = hashmap_new(&string_hash_ops);
+ if (!arg_disks)
+ goto cleanup;
- if (!options) {
- options = strdup("timeout=0");
- if (!options) {
- log_oom();
- goto cleanup;
- }
- }
+ r = parse_proc_cmdline(parse_proc_cmdline_item);
+ if (r < 0) {
+ log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+ r = EXIT_FAILURE;
+ }
- if (create_disk(name, device, arg_keyfile, options) < 0)
- goto cleanup;
+ if (!arg_enabled) {
+ r = EXIT_SUCCESS;
+ goto cleanup;
}
- r2 = EXIT_SUCCESS;
+ if (add_crypttab_devices() < 0)
+ goto cleanup;
+
+ if (add_proc_cmdline_devices() < 0)
+ goto cleanup;
+
+ r = EXIT_SUCCESS;
cleanup:
- strv_free(arg_disks);
- strv_free(arg_options);
- free(arg_keyfile);
+ free_arg_disks();
+ free(arg_default_options);
+ free(arg_default_keyfile);
- return r != EXIT_SUCCESS ? r : r2;
+ return r;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-21 21:00:03 +0000