From 9040e15cd3cba546b47aeae0ea133afa1a6ad292 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Wed, 13 Nov 2019 10:32:30 +0100
Subject: [PATCH] cryptsetup-generator: guess whether the keyfile argument is
two items or one
Fixes #13615.
See the inline comment for documentation.
(cherry picked from commit 32c6237a7c2e697d2fc4f3403319db16858fb8e3)
Related: #1763155
---
src/cryptsetup/cryptsetup-generator.c | 45 ++++++++++++++++++---------
1 file changed, 30 insertions(+), 15 deletions(-)
diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c
index a09983b576..4117930925 100644
--- a/src/cryptsetup/cryptsetup-generator.c
+++ b/src/cryptsetup/cryptsetup-generator.c
@@ -54,17 +54,36 @@ static int split_keyspec(const char *keyspec, char **ret_keyfile, char **ret_key
c = strrchr(keyspec, ':');
if (c) {
- keyfile = strndup(keyspec, c-keyspec);
- keydev = strdup(c + 1);
- if (!keyfile || !keydev)
+ /* The keydev 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 keyfile part has the same syntax.
+ *
+ * Let's try to guess if the second part looks like a keydev 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 keyfile argument. */
+
+ keydev = fstab_node_to_udev_node(c + 1);
+ if (!keydev)
return log_oom();
- } else {
+
+ if (path_is_absolute(keydev))
+ keyfile = strndup(keyspec, c-keyspec);
+ else {
+ log_debug("Keyspec argument contains a colon, but \"%s\" doesn't look like a device specification.\n"
+ "Assuming that \"%s\" is a single device specification.",
+ c + 1, keyspec);
+ keydev = mfree(keydev);
+ c = NULL;
+ }
+ }
+
+ if (!c)
/* No keydev specified */
keyfile = strdup(keyspec);
- keydev = NULL;
- if (!keyfile)
- return log_oom();
- }
+
+ if (!keyfile)
+ return log_oom();
*ret_keyfile = TAKE_PTR(keyfile);
*ret_keydev = TAKE_PTR(keydev);
@@ -73,7 +92,7 @@ static int split_keyspec(const char *keyspec, char **ret_keyfile, char **ret_key
}
static int generate_keydev_mount(const char *name, const char *keydev, const char *keydev_timeout, bool canfail, char **unit, char **mount) {
- _cleanup_free_ char *u = NULL, *what = NULL, *where = NULL, *name_escaped = NULL, *device_unit = NULL;
+ _cleanup_free_ char *u = NULL, *where = NULL, *name_escaped = NULL, *device_unit = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
usec_t timeout_us;
@@ -111,22 +130,18 @@ static int generate_keydev_mount(const char *name, const char *keydev, const cha
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%s\n", what, where, canfail ? ",nofail" : "");
+ "Options=ro%s\n", keydev, where, canfail ? ",nofail" : "");
if (keydev_timeout) {
r = parse_sec_fix_0(keydev_timeout, &timeout_us);
if (r >= 0) {
- r = unit_name_from_path(what, ".device", &device_unit);
+ r = unit_name_from_path(keydev, ".device", &device_unit);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");