| Commit message (Collapse) | Author | Age | Files | Lines |
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A strict remake takes a majority of members whose --strict-keys take
its manifest's signer: no node votes for one without, so
--follow-strict-remakes (1173) goes. A node that doesn't vote still
switches once the others commit, as with any remake.
So that an operator can tell why one fails: a strict remake aborted
for want of a majority (the voting period over, or a majority out of
reach) says in its reason (GET /admin/remakes/{id}, and the
coordinator's log) which members didn't vote, and that a member votes
for one only with its manifest signed by a key of its --strict-keys.
Each of those logs why itself (`Not voting for a strict remake`).
The sim a_strict_remake_too_few_take: only a takes the manifest; the
remake aborts, naming b and c.
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Until a swarm is strict, the user a change names is its node's word, so
any member could have planted registry entries, policy, bans or
user-signed values as any user, plain or signed by a key it put there
itself; writing the strict policy trusted all of it as it was.
A remake of a new kind, `strict`, turns a swarm strict instead:
* Its content is a manifest (access::strict): the swarm, the strict
policy, and each value kept at the places values are signed, by the
SHA-256 of its JSON, signed by an operator (ssh-keygen -Y sign -n
continuum-strict).
* Every node builds the next epoch as compaction does, keeping at the
signed places only the values the manifest names, as they were at
the base, and writing its policy (RemakeKind::protocol, the one kind
that changes protocol data). Writes after the base reach the new
epoch only by replays, judged by the strict policy.
* A node votes for one only with its manifest signed by one of
--strict-keys, keys given out of the document; without any, for none
(logged once, `Not voting for a strict remake`), unless
--follow-strict-remakes. A coordinator proposes only what it would
vote for (403). Once a majority commits one, every node switches, as
with any remake: refusing to switch would only cut a node off.
* GET /admin/strict-manifest gives the manifest keeping everything held
now, the values for review and the heads they are at;
continuum-signed strict shows them, signs once confirmed and proposes
at those heads.
The sim a_swarm_turning_strict_through_a_remake: a member plants a
registry entry as a manager; the operator's manifest leaves it out; a
and b, given the key, commit; c, without, follows; the entry is gone
and the policy strict everywhere.
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Review 6: a node remembers the challenges used until they expire, 10 000
at most, and refused every login by key once full. One user holding a
key could make 10 000 logins within five minutes and keep everyone else
out.
A user may now log in by key at most --key-logins-per-user times (100)
on a node within a challenge's lifetime, past which that user waits and
others don't; the 10 000 stay as the cap for all users together. The
lifetime, five minutes until now, is --challenge-lifetime.
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Simulations backing what the review's fixes changed, beyond their unit
tests:
* a_change_forged_under_another_members_actor (1145): a change made
under b's actor at the seq of b's last change, judged by a: refused
as forged, b not refused as a whole, b's next write taken.
* an_expired_remake_aborted_by_any_member (1150): under the policy, a
coordinator gone before it decides; b aborts its remake once it
expired a grace period ago, c takes the abort, nothing refused.
* a_strict_swarm (1155): a value alice signed for another swarm,
replacing the one there, is refused as such.
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Review 3.1, part of finding 12: a signed value's payload bound path,
user, time and prev, but not the swarm. A user with the same name and
key in two swarms could have an envelope replayed from one into the
other, wherever the path holds no envelope yet (prev "").
The payload now names the swarm (`swarm`), and a node takes an envelope
only for its own. /auth/whoami says the swarm, and continuum-signed and
the example in api.md sign it. Wire version 44: nodes before this
refuse such envelopes, and those after refuse the old ones.
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a_swarm_judging_every_change waited for c's forged write to be refused
by a, b and d each. The first to judge it tells c, which drops it before
the others may have it: wait for a refusal on any of them, then for c to
drop it.
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In a_strict_swarm and sealed_values, c's forged writes were waited for
to be refused by a and by b. Whichever judges them first tells c, which
drops them before the other may have judged them (it waits for their
signature, or never gets them): wait for a refusal on either, then for
c to drop them.
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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 member writing past its API's checks is refused, told, drops its
change and is taken again; a node under a policy it doesn't know
takes no writes and syncs on.
Auth plan M6 (tests).
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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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With signatures required, a member whose own change broke a rule is
refused as a whole: sent nothing, shown in /peers (refused), in stats
(sync.refusedPeers) and on the dashboard, until a change of its is
taken again or the epoch changes.
Auth plan M6 (diverged standing).
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A value sealed for its declared readers goes everywhere; one sealed
for a stranger too, or plain, gets nothing past the others.
Auth plan M8.
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Signed values everywhere, carried over by a remake and replaced after
it; a member writing the registry or a signed path plain gets nothing
past the others.
Auth plan M7.
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The first users' SSH keys, recorded at genesis with their entries, so a
swarm can be strict from its start.
Auth plan M7.
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A swarm judging every change: honest writes everywhere, a joining node
registers, a forged write stays where it was made; a compaction under
the policy refuses nothing honest.
Auth plan M6.
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Every change vouched for on every node within a second; a forged
signature vouches for nothing.
Auth plan M5.
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Signatures no sync message took go on their own within a second, to
each peer not sent them yet (wire version bumped).
Auth plan M5.
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A node's signatures are saved with its document (--document-file) and
loaded with it.
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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