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swarm-bao: let the controller list linked-account dirs

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OpenBao checks a LIST against the directory with a trailing slash, so
the controller's LIST on secret/metadata/swarm/agents/<a>/matrix is
checked as .../matrix/. Its empty last segment matches the `+` in the
delete stanza .../agents/+/matrix/+ (added by bbf93120), which then is
the only non-exact rule matching, and its ["delete"] denies the LIST
before acl.go's trimmed-path fallback reaches .../+/matrix ["list"].
The forge directory fails the same way against .../+/forge/+.

Writing the list stanzas as .../+/matrix/ and .../+/forge/ makes them
match the slashed request too, and with one `+` segment against two
they outrank the delete stanzas. Deletes on .../matrix/<id> still
resolve to .../+/matrix/+, which the slashed list path does not match.

Reproduced by iris against a local bao server -dev with a non-root
token: list stanza alone allowed, plus the delete stanza denied, list
stanza with trailing slash plus the delete stanza allowed.

Closes #4919
This commit is contained in:
atlas 2026-10-04 16:58:51 +02:00 • committed by mara
commit 4356dc82a4
2 changed files with 13 additions and 7 deletions
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11
nix/module-eval/bao-grants.nix
View file

@ -1197,9 +1197,10 @@ let
}
{
# `linked_accounts` names an agent's matrix accounts and forge labels by
# listing their two directories. A LIST matches the directory path
# itself, so each stanza reaches that one directory: not the agent's
# other keys, not `agents/` itself, not anything below. Pinned as whole
# listing their two directories. bao checks a LIST against the directory
# with a trailing slash, so each stanza names that slashed path and
# reaches that one directory: not the agent's other keys, not `agents/`
# itself, not anything below. Pinned as whole
# stanzas, and as the only metadata stanzas under `agents/` beside the
# queue revocation and the account deletes, so a widened path or an added
# capability fails.
@ -1209,8 +1210,8 @@ let
s = baoGrantHere.systemd.services.swarm-bao-controller-policy.script;
stanzas = lib.length (lib.splitString "path \"secret/metadata/swarm/agents/" s) - 1;
in
lib.hasInfix "path \"secret/metadata/swarm/agents/+/matrix\" {\n capabilities = [\"list\"]\n}" s
&& lib.hasInfix "path \"secret/metadata/swarm/agents/+/forge\" {\n capabilities = [\"list\"]\n}" s
lib.hasInfix "path \"secret/metadata/swarm/agents/+/matrix/\" {\n capabilities = [\"list\"]\n}" s
&& lib.hasInfix "path \"secret/metadata/swarm/agents/+/forge/\" {\n capabilities = [\"list\"]\n}" s
&& stanzas == 6;
}
{