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Review 2.2: swap_document forgot every signature. After dropping
changes taken unjudged (or a rejoin into the same epoch), the node
could vouch for none of the changes it kept: under signatures required,
those building on an actor waited for that actor's next signature, and
for an actor that stopped writing, forever.
Signatures::kept_for keeps the signatures of the changes the new
document holds, checks each actor's latest again, and keeps those
waiting for their changes. This node's replayed changes are signed at
once, as before.
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A node refusing a member as a whole sent it nothing, and lifted that
only when a change of the member's was taken again. But a member that
dropped what was refused (REFUSALS) starts its sync sessions over, and
a fresh session sends no changes until the other side answers: the two
waited for each other, and the member stayed refused.
The refusal now notes the member's run and epoch_seq when it began; a
member with another document since (it dropped what was refused, or
rejoined) is synced with again.
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The API checks the path a request asks for; the rules judge everything
the change does. Where they disagreed, the honest node's change was
refused by every other node, and with signatures required the node was
refused as a whole. The plan had both gates run the same judgement.
Under a policy, each change a node makes (its own writes and those
through the API) is now judged by rules::judge as receivers will judge
it, before it is signed or sent; one every node would refuse is rolled
back (the document forked at the heads before it, same actor: the
change never left) and the request refused with 403 (StoreError::
Refused). rules::judge_held, judging a change the document holds,
moves from swarm::refusals to access::rules for both.
The simulations that play a member past its own checks write with a
helper that bypasses them (forge).
Review finding 3 (the same judgement at both gates).
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A REFUSALS naming the swarm's first change made the node receiving it
judge that change again in a document that isn't empty, refuse it as
"a change without dependencies that isn't the epoch's root", and drop
it with everything built on it: its whole document.
The first epoch's root is now the first change a document holds, as it
comes to an empty one or as it is in one; a change judged again on a
peer's word is never refused for having no dependencies; and
drop_taken refuses to drop an epoch's root, or anything that would
leave nothing kept, logging an error instead.
Review finding 1 (critical).
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A node refusing changes a peer brought tells it which broke a rule; the
peer judges them itself, and if its rules refuse them too, drops them
with all built on them (its document forked without them, a fresh
actor), quarantining its own writes among them. Wire version 42.
Auth plan M6 (rejoin on taint).
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POST /auth/challenge and /auth/login/key: a node-signed challenge,
valid five minutes and taken once, signed with one of the user's SSH
keys (ssh-keygen -Y sign -n continuum-login), for a token.
Auth plan M7 (key login, M2b).
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Under a policy, a change by a node that isn't a member is refused with
all built on it: a node's registration is written before any write of
its own or through the API, not after (the registration itself
exempt).
Auth plan M6 (fix).
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"signatures": "required": a change counts only once a signature by its
committer vouches for it, and waits until then; every node then signs
every change it makes.
Auth plan M6.
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_continuum/access/policy ({"version": 1}) has every node screen every
change it receives, on every path changes come in. A policy a node
doesn't know stops its writes through the API. GET /admin/refused.
Auth plan M6.
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Forget records and released quarantines name the user who made them,
so they are judged by its capabilities.
Auth plan M6.
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Sync messages carry, for each actor's writes, the latest signature the
sender checked; the receiver checks it once it holds the change.
Auth plan M5.
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Changes left unsigned are vouched for by the node's next signature:
--sign-every 1s (default) signs the latest within a second, all signs
every change, none only those that must be.
Auth plan M5.
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Every node signs the changes it commits with its node key, an Ed25519
signature over the change's hash, kept beside the document. One
signature on an actor's latest change vouches for its earlier ones.
Protocol data and paths listed in _continuum/access/signed are signed,
and writes with ?signed=true.
Auth plan M5.
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The dashboard reads every member's links from the members themselves;
LINKS and LINKS_REPLY, swarm::links and their wire tags go (wire
version bumped). Nodes the browser can't reach are drawn from what the
reachable ones measure.
Auth plan M3.
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GET /admin/dashboard/links/own and its event stream: a node's own links,
as LINKS_REPLY carried them, for other members' dashboards with a
token. CORS for the members' dashboard origins and --cors-origins,
without credentials.
Auth plan M3.
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POST /auth/login (by htpasswd or the proxy), /auth/refresh,
/auth/logout, GET /auth/whoami; every request may bring
Authorization: Bearer instead of a password. --token-lifetime and
--session-lifetime.
Auth plan M2.
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--bootstrap-users gives a new swarm a registry from its first change,
each first user with everything; other users may do nothing until
added. Without it the swarm has no registry and works as before.
Auth plan M1.
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While we wait for a peer's HELLO_REPLY, anything else that comes from it
makes our HELLO go again at once, at most once a second, instead of when
the backoff says.
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The heal clock now also restarts when our heads and the peer's have both
changed since the last STATUS that showed them differing. While writes
go on, two neighbours's heads differ because of changes still on their
way, and that alone no longer leads to a heal.
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An overdue sync answer is now followed by a PING too, and the peer stays
reached once it answers the PING.
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