It's more natural than using a zero-secret when something goes wrong.
Also note that the HSM will actually kill the connection if the ECDH
fails, which is fortunately statistically unlikely.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is prep work for when we sign htlc txs with
SIGHASH_SINGLE|SIGHASH_ANYONECANPAY.
We still deal with raw signatures for the htlc txs at the moment, since
we send them like that across the wire, and changing that was simply too
painful (for the moment?).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It means an extra allocation at startup, but it means we can hide the definition,
and use standard patterns (new_daemon_conn and typesafe callbacks).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Have c-lightning nodes send out the largest value for
`htlc_maximum_msat` that makes sense, ie the lesser of
the peer's max_inflight_htlc value or the total channel
capacity minus the total channel reserve.
BOLT 7's been updated to split the flags field in `channel_update`
into two: `channel_flags` and `message_flags`. This changeset does the
minimal necessary to get to building with the new flags.
We used to use it to complain about bad requests, but we use the status conn
now, so it's unused except for tests and asserts.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It offers them a DoS vector, if they don't read the replies. We really want
to use raw ccan/io so we can avoid buffering for this.
It makes the handing of fds for new clients a bit more complex
(callback based), but it's not too bad.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Thanks greatly to the four people who I *know* have read this:
@wythe, @ZmnSCPxj, @SimonVrouwe, and @cdecker
Your feedback will help future developers seeking enlightenment!
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
That matches the other CSV names (HSM was the first, so it was written
before the pattern emerged).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The current code sends hsmstatus_client_bad_request via the req fd;
this won't work, since lightningd uses that synchronously and only
expects a reply to its commands. So send it via status_conn.
We also enhance hsmstatus_client_bad_request to include details, and
create convenience functions for it. Our previous handling was ad-hoc;
we sometimes just closed on the client without telling lightningd,
and sometimes we didn't tell lightningd *which* client was broken.
Also make every handler the exact same prototype, so they now use the
exact same patterns (hsmd *only* handles requests, makes replies).
I tested this manually by corrupting a request to hsmd.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
@renepickhardt: why is it actually lightningd.c with a d but hsm.c without d ?
And delete unused gossipd/gossip.h.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This means we make sure that we only have one fd per dbid, but more importantly
it enables leak detection, since we can iterate the clients we have.
If we get a second hsmfd request for the same dbid, we free the old
one: sometimes we get the new request before we notice the old daemon
died. We also have to handle the three 0-value dbid daemons a bit
specially.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
1. The handle pointer is always set to handle_client: just call direclty.
2. Call the root 'client' variable master.
3. We never exit the io_loop: we exit via master_gone instead, so cleanup there.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Currently it works for any secret (we don't know the current secret),
but importantly it doesn't leak timing information when checking.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
I managed to crash the HSM by asking for point -1 (shachain_index has an
assert). Fail in this case, instead.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
tal_count() is used where there's a type, even if it's char or u8, and
tal_bytelen() is going to replace tal_len() for clarity: it's only needed
where a pointer is void.
We shim tal_bytelen() for now.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This will be used by onchaind for now, but also for openingd and channeld
in future, so it returns the old revocation secret as well.
Of course, the HSM should refuse to sign a commitment transaction if it
has handed out the revocation secret previously!
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
I crashed the HSMD, and it gave no output at all. That's because we
were only reading the status fd when we were waiting for a reply.
Fix this by using a separate request fd and status fd, which also means
that hsm_sync_read() is no longer required.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We need this later, to generate its seed. When we switch to lnd's key system,
we'll only need this, and not peerid.
Note also that the peerid is not just for messages any more, too.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Originally we were supposed to tell the HSM we had just created the directory,
otherwise it wouldn't create a new seed. But we modified it to check if
there was a seed file anyway: just move that logic into a branch of hsmd.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
In particular, the main daemon and subdaemons share the backtrace code,
with hooks for logging.
The daemon hook inserts the io_poll override, which means we no longer
need io_debug.[ch]. Though most daemons don't need it, they still link
against ccan/io, so it's harmess (suggested by @ZmnSCPxj).
This was tested manually to make sure we get backtraces still.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
If we're going to simply take() a pointer, don't allocate it off a random
object. Using NULL makes our intent clear, particularly with allocating
packets we're going to take() onto a queue.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Rusty Russell
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