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Typically if PK is not present we want to treat this as "denied". But
sometimes it makes sense to treat this case as "allowed".
In particular the combination POLKIT_ALWAYS_QUERY and
POLKIT_DEFAULT_ALLOW makes a lot of sense: it means we can enable PK
logic for actions where we so far bypassed the checks for root. With the
new combination we can have a default policy of allowing some operation
but still provide an effective hook to disable it.
Also add some debug logging about PK operations and results as they are ongoing.
When this flag is set we'll disable the local shortcut that skips polkit
checks for clients that are privileged, and assumes they are
authenticated.
Or in other words: if this flag is set, we'll query PK not matter what,
regardless if it's root we talk about or any other user.
This adds a new helper that basically just wraps
async_polkit_query_have_action() and allows calling this without
actually triggering a PK authentication operation: it just checks if we
aleady have acquired an action or not.
- prefix length and preference should be fit in uint8_t, and actually
the kernel and networkd uses uint8_t to store them.
- captive portal is now stored as a NUL-terminated string. Hence, it
is not necessary to also provide its length.
It is not used in this commit, but will be used for parsing NDisc
options in Router Advertisement message and friends.
The parser does mostly equivalent to what currently we do in
sd-ndisc-router.c. Several notable differences are:
- also perse source and target link-layer address,
- refuse multiple captive portals,
- check if the captive portal is in safe characters, as previously we
checked that in networkd-ndisc.c,
- dedup prefixes, routes, and pref64,
- limit the total number of options, for safety.
We may want to propagate O_APPEND, or (try to) keep the current file position,
even if we use fd_reopen() to re-initialize (and "unshare") other file
description status.
For now, used only with --pty to keep/propagate O_APPEND (and/or) position
if set on stdin/stdout.
If we re-open stdout and "drop" the O_APPEND,
we get rather "unexpected" behavior,
for example with repeated "systemd-run --pty >> some-log".
If someone carefully pre-positioned the passed in original file descriptors,
we avoid surprises if we do not reset file postition to zero.
fcntl F_GETFL first, and propagate O_APPEND if present in the existing flags.
Then use lseek to propagate the file position.
This was lost on refactor, and only addons had a default uki
line in the .sbat. Add it back, and differentiate between the
default for UKIs vs the default for addons, so that they can
be revoked separately. These are only defaults and users are
encouraged to provide their own.
Follow-up for a8b645dec8
This is a follow-up for 945a8210c7 and
makes the st_dev check generic, so that we can reuse it some other
places. It also incorporates the non-NULL check now, to be a
comprehensive one-stop solution.
The helper is static inline so that compilers can optimize the redundant
checks away in case it is combined with other checks.
