Reject invalid quoted strings

String which ended in an unfinished quote were accepted, potentially
with bad memory accesses.

Reject anything which ends in a unfished quote, or contains
non-whitespace characters right after the closing quote.

_FOREACH_WORD now returns the invalid character in *state. But this return
value is not checked anywhere yet.

Also, make 'word' and 'state' variables const pointers, and rename 'w'
to 'word' in various places. Things are easier to read if the same name
is used consistently.

mbiebl_> am I correct that something like this doesn't work
mbiebl_> ExecStart=/usr/bin/encfs --extpass='/bin/systemd-ask-passwd "Unlock EncFS"'
mbiebl_> systemd seems to strip of the quotes
mbiebl_> systemctl status shows
mbiebl_> ExecStart=/usr/bin/encfs --extpass='/bin/systemd-ask-password Unlock EncFS  $RootDir $MountPoint
mbiebl_> which is pretty weird

1 files changed, 9 insertions, 9 deletions

diff --git a/src/login/logind-inhibit.c b/src/login/logind-inhibit.c
index 64a62ffeae..a9e14af8db 100644
--- a/src/login/logind-inhibit.c
+++ b/src/login/logind-inhibit.c
@@ -439,23 +439,23 @@ const char *inhibit_what_to_string(InhibitWhat w) {
 
 InhibitWhat inhibit_what_from_string(const char *s) {
         InhibitWhat what = 0;
-        char *w, *state;
+        const char *word, *state;
         size_t l;
 
-        FOREACH_WORD_SEPARATOR(w, l, s, ":", state) {
-                if (l == 8 && strneq(w, "shutdown", l))
+        FOREACH_WORD_SEPARATOR(word, l, s, ":", state) {
+                if (l == 8 && strneq(word, "shutdown", l))
                         what |= INHIBIT_SHUTDOWN;
-                else if (l == 5 && strneq(w, "sleep", l))
+                else if (l == 5 && strneq(word, "sleep", l))
                         what |= INHIBIT_SLEEP;
-                else if (l == 4 && strneq(w, "idle", l))
+                else if (l == 4 && strneq(word, "idle", l))
                         what |= INHIBIT_IDLE;
-                else if (l == 16 && strneq(w, "handle-power-key", l))
+                else if (l == 16 && strneq(word, "handle-power-key", l))
                         what |= INHIBIT_HANDLE_POWER_KEY;
-                else if (l == 18 && strneq(w, "handle-suspend-key", l))
+                else if (l == 18 && strneq(word, "handle-suspend-key", l))
                         what |= INHIBIT_HANDLE_SUSPEND_KEY;
-                else if (l == 20 && strneq(w, "handle-hibernate-key", l))
+                else if (l == 20 && strneq(word, "handle-hibernate-key", l))
                         what |= INHIBIT_HANDLE_HIBERNATE_KEY;
-                else if (l == 17 && strneq(w, "handle-lid-switch", l))
+                else if (l == 17 && strneq(word, "handle-lid-switch", l))
                         what |= INHIBIT_HANDLE_LID_SWITCH;
                 else
                         return _INHIBIT_WHAT_INVALID;