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add aspect resulting from our discussion
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Michael Jerger
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1 changed files with 64 additions and 17 deletions
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@ -6,10 +6,17 @@
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- [Decision](#decision)
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- [Choices](#choices)
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- [1. Map to plain forgejo User](#1-map-to-plain-forgejo-user)
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- [1. Pro](#1-pro)
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- [1. Con](#1-con)
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- [2. Map to User-\&-ExternalLoginUser](#2-map-to-user--externalloginuser)
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- [2. Pro](#2-pro)
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- [2. Con](#2-con)
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- [3. Map to User-\&-FederatedUser](#3-map-to-user--federateduser)
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- [3. Pro](#3-pro)
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- [3. Con](#3-con)
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- [4. Map to new FederatedPerson and introduce a common User interface](#4-map-to-new-federatedperson-and-introduce-a-common-user-interface)
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- [4. Pro](#4-pro)
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- [4. Con](#4-con)
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## Status
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@ -41,11 +48,21 @@ tbd
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4. User is not Admin
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5. User is not Active
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We can use forgejo code (like star / unstar fkt.) without changes.
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#### 1. Pro
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No new model & persistence is introduced.
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1. We can use forgejo code (like star / unstar fkt.) without changes.
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2. No new model & persistence is introduced, architectural change is small.
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But we use fields against their semantic and see some problems / limitations for mapping arise.
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#### 1. Con
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1. But we use fields against their semantic and see some problems / limitations for mapping arise.
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1. generating email having the source fqdn is impacted by email whitelists.
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1. loginName is used for mapping, but e.g. @ is not allowed.
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1. password is generated headless.
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2. Maybe the large User table gets even larger (see https://git.exozy.me/a/gitea/issues/2)
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3. Occasional contributors may not understand the difference in level of trust implied by federated user. This may promote errors with security impact.
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4. Understanding federated users entries being kind of cache would conflict with user table entries.
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5. LoginNames may be occupied by federated users. This may leak information and increase attack surface.
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```mermaid
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classDiagram
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@ -112,15 +129,26 @@ classDiagram
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4. User is not Admin
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5. User is not Active
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3. Created ExternalLoginUser is limited
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1. Login via fediverse is not intended and will not work
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1. Login via fediverse is not intended and will not work. This is distinct to the F3 usecase.
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We can use forgejo code (like star / unstar fkt.) without changes.
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#### 2. Pro
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No new model & persistence is introduced, no need for refactorings.
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1. We can use forgejo code (like star / unstar fkt.) without changes.
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2. No new model & persistence is introduced, architectural change is small. Comparable to option 1.
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3. This option was taken by the F3-Export/Import-Feature
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4. Mapping may be more reliable compared to option 1.
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But we use fields against their semantic (User.EMail, User.Password, User.LoginSource, ExternalLoginUser.Login*) and see some problems / limitations for login functionality arise.
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#### 2. Con
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Mapping may be more reliable compared to option 1.
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1. We use fields against their semantic (User.EMail, User.Password, User.LoginSource, ExternalLoginUser.Login*) and see some problems / limitations for login functionality arise. Situation is worse than option 1.
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1. generating email having the source fqdn is impacted by email whitelists.
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2. password is generated headless.
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3. TODO: How would we map/generate User.LoginName ?
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4. TODO: How would we generate ExternalLoginUser.Login* fields?
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2. Getting a larger User table applies to this solution comparable to option 1.
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3. Occasional contributors may not understand the difference in level of trust implied by federated user, this may promote errors with security impact.
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4. Understanding federated users entries being kind of cache would conflict with user table entries.
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5. LoginNames may be occupied by federated users. This may leak information and increase attack surface.
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```mermaid
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classDiagram
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@ -209,13 +237,23 @@ classDiagram
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4. User is not Admin
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5. User is not Active
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We can use forgejo code (like star / unstar fkt.) without changes.
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#### 3. Pro
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Introduce FederatedUser as new model & persistence.
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1. We can use forgejo code (like star / unstar fkt.) without changes.
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2. Introduce FederatedUser as new model & persistence, architectural change is medium.
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3. We will be able to have a reliable mapping. Better than option 1 & 2.
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But we use fields (User.EMail, User.Password) against their semantic, but we probably can handle the problems arising.
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#### 3. Con
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We will be able to have a reliable mapping.
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1. But we use fields (User.EMail, User.Password) against their semantic, but we probably can handle the problems arising. Situation is comparable to option 1.
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1. generating email having the source fqdn is impacted by email whitelists.
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2. password is generated headless.
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3. TODO: How would we map/generate User.LoginName ?
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2. Getting a larger User table applies to this solution comparable to option 1.
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3. Occasional contributors may not understand the difference in level of trust implied by federated user, this may promote errors with security impact, comparable to option 1.
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4. Getting a larger User table applies to this solution comparable to option 1.
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5. Understanding federated users entries being kind of cache would conflict with user table entries.
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6. LoginNames may be occupied by federated users. This may leak information and increase attack surface.
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```mermaid
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classDiagram
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@ -302,11 +340,20 @@ classDiagram
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1. We map PersonId.asWbfinger() to FederatedPerson.ExternalID (e.g. 13@some.instan.ce).
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2. We will have no semantic mismatch.
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We can use forgejo code (like star / unstar fkt.) after refactorings only. At every place of interaction we have to enhance persistence (e.g. a find may have to query two tables now) & introduce a common User interface.
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#### 4. Pro
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We introduce new model & persistence.
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1. We will be able to have a reliable mapping.
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2. We will not use fields against their semantics.
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3. We do not enhance user table with "cache entries". Forgejo stays scalable, no additional DOS surface.
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4. Occasional contributors may understand a clear difference between user and federated user.
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5. No LoginNames where occupied
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6. Caching aspects of federated users (like refresh, evict) may be easier to implement.
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We will be able to have a reliable mapping.
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#### 4. Con
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1. We can use forgejo code (like star / unstar fkt.) after refactorings only.
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2. At every place of interaction we have to enhance persistence (e.g. a find may have to query two tables now) & introduce a common User interface.
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3. We introduce new model & persistence.
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```mermaid
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classDiagram
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@ -380,4 +427,4 @@ classDiagram
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FederationHost *-- NodeInfo
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FederatedPerson -- FederationHost
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FederatedPerson ..<| CommonUser
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```
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```
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