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dir-sim plan: V17 mailbox delegation, V18 document access (design) - #344
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Merge Risk: 🔵 Low · up to Clarify how SendOnBehalf grants are read before implementing the design. This documentation ambiguity does not currently block a running workflow. Pre-merge checks |
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A rabbit reads the rights in rows,
FullAccess, SendAs, and more.
Through fields of notes, the models grow,
While links mark every door.
It nibbles on a design,
Then hops along the line.
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Review from the HubSPO-rs side (the consumer whose comms API map started V17/V18). V17 covers the delegation ask, and covers it more precisely than the HubSPO-rs handover (#345, merged). The three rights stay distinct, grants are relations, group trustees are covered, and each grant records the witness that asserted it. V18 states the document-access gap correctly. Five points to settle before implementation:
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…endOnBehalf The HubSPO-rs handover listed a group as owner as a violation for every mailbox right; it holds for FullAccess only. Adds the deny-entry and nested-group dependencies raised on #344. Appended, not edited. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPcakjk7ioQsnasmNDtc5z
V17 models Exchange's three mailbox rights (FullAccess, SendAs, SendOnBehalf) as (object, trustee, right) relations with their witness, resolved through group membership. V18 records the SharePoint/OneDrive document-access proposal as open. Both answer gaps HubSPO-rs listed in its comms API map. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg
…lwart sends; two document regimes Folds in the HubSPO-rs review on #344: - FullAccess needs a mailbox; SendAs and SendOnBehalf also apply to a distribution group. - group trustees reach users through nested-group expansion, which dir-sim does not have yet (lance-graph W-4); until then only direct members. - a deny from any witness removes the right and is reported; grants alone would fail open. - sending through Stalwart: an identity may only carry its own account's addresses, so SendOnBehalf goes from the trustee's account with Sender set, and SendAs goes to the object's account by master-user impersonation after the V17 check. - V18: record attachments take access from their record; only library and OneDrive files follow the SharePoint model. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg
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All five points are folded into V17/V18 in 93d048e:
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Review comments at @docs/DIRECTORY-SIMULATION-POC.md:
- Around line 492-494: Update the Exchange permission-source description for the
read-only encoder to distinguish the three grant types: identify the permission
cmdlets as the sources for FullAccess and SendAs, and specify that SendOnBehalf
trustees are read from recipients’ GrantSendOnBehalfTo property. Do not present
GrantSendOnBehalfTo as a read cmdlet.
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… scope Graph does not return inheritedFrom for SharePoint and OneDrive for Business, so inheritance is read from the parentReference walk and SharePoint's HasUniqueRoleAssignments flag. A sharing link keeps its scope: only anonymous links admit any holder; organization links need a user signed in to the tenant; users links admit only their named identities. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg
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…Behalf source, link scope and expiry Review findings left open when #344 merged: - FullAccess and SendAs need a user or a security-enabled group; SendOnBehalf also accepts mail-enabled distribution groups and is reached through the delivery closure. - Denies follow Windows canonical ACE order with IsInherited kept; an explicit allow outranks an inherited deny; an unreported level is treated as explicit. - SendOnBehalf is read from the GrantSendOnBehalfTo property via Get-Mailbox / Get-DistributionGroup / Get-DynamicDistributionGroup. - SendAs on a distribution group has no impersonation target; the consumer refuses it until a group-sending path exists. - existingAccess links grant nothing; expired grants are refused; caller-scoped Graph permission reads never decide others' access. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg
Design entries for two gaps HubSPO-rs listed in its comms API map (
.claude/knowledge/comms-api-surface.md§2, items 2 and 4). Docs only.V17 — mailbox delegation. Exchange's three rights on a recipient, kept distinct:
Decisions:
(object, trustee, right), like a membership. It is never a node property.publicDelegates, and the automapped subset of FullAccess.V18 — document access. Open. It records the SharePoint/OneDrive model (roles granted on site, library, folder or item, inheritance until broken, sharing links) and a proposal:
The open questions are listed with it.
Implementation follows V17 in OGAR (relation type and changes), lance-graph dir-sim (relation and effective-right resolution) and Spear (mailbox IAM).
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