Include roles in ACL DIGEST - #4694
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A user line names the roles it holds but not their rules, so editing a role left the digest where it was even though the permissions of every member had changed. A client reading the digest to confirm which revision of an ACL a server is running would miss the edit. Walk the Roles radix tree as well, and hash the ACL LIST line of each entry with its leading keyword. The keyword matters once roles join the XOR: role names are checked for valid characters only, so a role and a user can carry the same name, and hashing name and rules alone would let such a pair cancel each other out. Signed-off-by: melancholictheory <selimvhorst@gmail.com>
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ChangesACL digest updates
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Severity of issue fixed: Medium Suggested reviewers: Merge Risk: ⚪ Minimal · up to The digest now covers role and user ACL entries without collisions, with matching metadata and focused tests; the change is ready to merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@tests/unit/acl.tcl`:
- Around line 1093-1094: Add a focused C++ unit test around ACLDigestAddTable
that verifies role and user entries remain distinguishable at the hash boundary,
including their role/user discriminators. Construct the entries through
ACLCreateUser and ACLDescribeUser as needed, and assert the digest table does
not treat them as identical; leave the existing Tcl command tests unchanged.
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| # user can carry the same name. Their lines must not cancel out. | ||
| set before [r ACL DIGEST] | ||
| r ACL setrole digesttwin ~twin:* +get | ||
| r ACL setuser digesttwin on >twinpass ~twin:* +get |
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This does not exercise the keyword that separates the two namespaces. This user’s description contains on and a password hash, while ACLDescribeUser omits flags and passwords for the role (src/acl.c:1206-1226), so their pre-keyword hash inputs are already different. An implementation that walks Roles but removes both keyword updates still passes these assertions. Make this check depend on the prefix, for example by comparing the digest of this controlled state with the expected hash of the complete ACL LIST lines.
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Confirmed, and I took your suggestion. Removing the keyword update while still walking Roles left both tests green, so they were not covering the prefix.
The new test in 0218015 compares the digest with the XOR of the SHA256 of every complete ACL LIST line. SHA256 comes from the server, because ACL SETUSER u >s stores the hex digest of s, so the check stays in Tcl and needs nothing exported from acl.c. Dropping either keyword now fails it.
Review pointed out that the two tests added here pass even when the role and user keywords are dropped from what gets hashed. They cannot collide today, because a user line carries flags and a password hash while a role line carries neither, so the keyword is what keeps the two namespaces apart if that ever stops holding. Add a test that compares the digest against the XOR of the SHA256 of every ACL LIST line, computed through the server, so the hashed content is pinned whole. It fails when a keyword is dropped, which neither of the other two does. The complexity in acl-digest.json counted users only. Walking the roles as well makes the runtime grow with the role count too. Signed-off-by: melancholictheory <selimvhorst@gmail.com>
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## unstable #4694 +/- ##
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+ Coverage 80.36% 80.47% +0.11%
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Files 191 191
Lines 99299 99361 +62
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+ Hits 79799 79965 +166
+ Misses 19500 19396 -104
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2 participants
Closes #4666.
ACL DIGESThashes theACL LISTline of each user and XORs the results together. A user line names the roles it holds but not what those roles allow, andACLDigestonly walkedUsers, so editing a role left the digest untouched while the permissions of every member changed. On unstable at 6163991:Alice gained
SETandACL LISTshows it, but the digest does not move. A client reading the digest to confirm which revision of an ACL a server is running would miss that edit.This walks
Rolesas well and hashes each entry as the lineACL LISTprints, keyword included. The keyword matters once roles join the XOR:ACLRoleNameErrorchecks characters only, sorole dupanduser dupcan both exist, and hashing name and rules alone would let the pair cancel out.Testing
Two cases in
tests/unit/acl.tcl: the digest follows a role's rules and returns to the previous value when the rule is put back, and a role and a user sharing a name do not cancel each other out. Without the change both fail and nothing else does, which is how I checked they test what they claim.unit/aclandunit/acl-rolerun green together, 219 tests.