`strings.to_cstring` previously would not check if the buffer could
handle the extra null byte and could lead to segmentation violations
when using the resulting string in an API expecting the terminator.
Adds a directory walker, a method of exposing and retrieving errors from
the existing read directory iterator, allows reusing of the existing
read directory iterator, and adds a file clone procedure
This fixes some vulnerabilities in the resolver that make spoofing DNS
queries somewhat trivial due to the code failing to randomize xid, as
well as match the reply xid with the query, and the origin of the packet:
- xid of the query was fixed at zero
- xid from the reply was never checked
- source address of the reply was never checked
This means anyone can flood the host with a fake reply with xid 0,
guessing the source port is trivial as it's less than 16bits (2^16 -
1024), which would cause odin to resolve a hostname to whatever an
attacker wanted.
While here also plug in two memory leaks.
Since this is CVE material, I've contacted @kelimion before hand which
instructed to put it in a PR.
There are also more bugs as the code conflates answer section,
authority section and aditional section into one, while in reality
only the anwer section should be taken into consideration.
This allows `*` to be used in C fashion, without specifying an argument
index to use. Like C, this results in the argument *preceding* the value
for the format specifier itself.
- A compression pointer is when the two higher bits are set, the code was
considering only 0xC0 as a pointer, where in reality anything from 0xC0-0xFF is
a pointer, probably went unnoticed since you need big packets to have long pointers.
- Make sure we can access the lower byte of the pointer by checking len, the
code was careful to not access past the first byte, but ignored the second.
- As per RFC9267 make sure a pointer only points backwards, this one is not so
bad, as the code had a iteration_max that ended up guarding against infinite jumps.
Lightly tested, some eyes are welcome, but these are remote DOSable.
