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cryptsetup-generator: guess whether the keyfile argument is two items or one

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Fixes #13615.

See the inline comment for documentation.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2019-11-13 10:32:30 +01:00
parent 3f5ac3038e
commit 32c6237a7c
1 changed files with 30 additions and 15 deletions
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45
src/cryptsetup/cryptsetup-generator.c
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@ -62,17 +62,36 @@ 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);
@ -81,7 +100,7 @@ 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;
@ -119,22 +138,18 @@ 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");