ask-password: add support for caching passwords in the kernel keyring

This adds support for caching harddisk passwords in the kernel keyring
if it is available, thus supporting caching without Plymouth being
around.

This is also useful for hooking up "gdm-auto-login" with the collected
boot-time harddisk password, in order to support gnome keyring
passphrase unlocking via the HDD password, if it is the same.

Any passwords added to the kernel keyring this way have a timeout of
2.5min at which time they are purged from the kernel.

1 files changed, 5 insertions, 9 deletions

diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c
index 5d5872b7f4..cc03ad3ca8 100644
--- a/src/cryptsetup/cryptsetup.c
+++ b/src/cryptsetup/cryptsetup.c
@@ -313,14 +313,10 @@ static char *disk_mount_point(const char *label) {
 }
 
 static int get_password(const char *vol, const char *src, usec_t until, bool accept_cached, char ***passwords) {
-        int r = 0;
-        char **p;
-        _cleanup_free_ char *text = NULL;
-        _cleanup_free_ char *escaped_name = NULL;
-        char *id;
+        _cleanup_free_ char *description = NULL, *name_buffer = NULL, *mount_point = NULL, *maj_min = NULL, *text = NULL, *escaped_name = NULL;
         const char *name = NULL;
-        _cleanup_free_ char *description = NULL, *name_buffer = NULL,
-                *mount_point = NULL, *maj_min = NULL;
+        char **p, *id;
+        int r = 0;
 
         assert(vol);
         assert(src);
@@ -364,7 +360,7 @@ static int get_password(const char *vol, const char *src, usec_t until, bool acc
 
         id = strjoina("cryptsetup:", escaped_name);
 
-        r = ask_password_auto(text, "drive-harddisk", id, until, accept_cached, passwords);
+        r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until, ASK_PASSWORD_PUSH_CACHE|(accept_cached ? ASK_PASSWORD_ACCEPT_CACHED : 0), passwords);
         if (r < 0)
                 return log_error_errno(r, "Failed to query password: %m");
 
@@ -378,7 +374,7 @@ static int get_password(const char *vol, const char *src, usec_t until, bool acc
 
                 id = strjoina("cryptsetup-verification:", escaped_name);
 
-                r = ask_password_auto(text, "drive-harddisk", id, until, false, &passwords2);
+                r = ask_password_auto(text, "drive-harddisk", id, "cryptsetup", until, ASK_PASSWORD_PUSH_CACHE, &passwords2);
                 if (r < 0)
                         return log_error_errno(r, "Failed to query verification password: %m");