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add aspect resulting from our discussion

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Michael Jerger 2024-02-01 15:48:56 +01:00
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docs/unsure-where-to-put/adr-map-federated-person.md
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@ -6,10 +6,17 @@
- [Decision](#decision)
- [Choices](#choices)
- [1. Map to plain forgejo User](#1-map-to-plain-forgejo-user)
- [1. Pro](#1-pro)
- [1. Con](#1-con)
- [2. Map to User-\&-ExternalLoginUser](#2-map-to-user--externalloginuser)
- [2. Pro](#2-pro)
- [2. Con](#2-con)
- [3. Map to User-\&-FederatedUser](#3-map-to-user--federateduser)
- [3. Pro](#3-pro)
- [3. Con](#3-con)
- [4. Map to new FederatedPerson and introduce a common User interface](#4-map-to-new-federatedperson-and-introduce-a-common-user-interface)
- [4. Pro](#4-pro)
- [4. Con](#4-con)
## Status
@ -41,11 +48,21 @@ tbd
4. User is not Admin
5. User is not Active
We can use forgejo code (like star / unstar fkt.) without changes.
#### 1. Pro
No new model & persistence is introduced.
1. We can use forgejo code (like star / unstar fkt.) without changes.
2. No new model & persistence is introduced, architectural change is small.
But we use fields against their semantic and see some problems / limitations for mapping arise.
#### 1. Con
1. But we use fields against their semantic and see some problems / limitations for mapping arise.
1. generating email having the source fqdn is impacted by email whitelists.
1. loginName is used for mapping, but e.g. @ is not allowed.
1. password is generated headless.
2. Maybe the large User table gets even larger (see https://git.exozy.me/a/gitea/issues/2)
3. Occasional contributors may not understand the difference in level of trust implied by federated user. This may promote errors with security impact.
4. Understanding federated users entries being kind of cache would conflict with user table entries.
5. LoginNames may be occupied by federated users. This may leak information and increase attack surface.
```mermaid
classDiagram
@ -112,15 +129,26 @@ classDiagram
4. User is not Admin
5. User is not Active
3. Created ExternalLoginUser is limited
1. Login via fediverse is not intended and will not work
1. Login via fediverse is not intended and will not work. This is distinct to the F3 usecase.
We can use forgejo code (like star / unstar fkt.) without changes.
#### 2. Pro
No new model & persistence is introduced, no need for refactorings.
1. We can use forgejo code (like star / unstar fkt.) without changes.
2. No new model & persistence is introduced, architectural change is small. Comparable to option 1.
3. This option was taken by the F3-Export/Import-Feature
4. Mapping may be more reliable compared to option 1.
But we use fields against their semantic (User.EMail, User.Password, User.LoginSource, ExternalLoginUser.Login*) and see some problems / limitations for login functionality arise.
#### 2. Con
Mapping may be more reliable compared to option 1.
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.
1. generating email having the source fqdn is impacted by email whitelists.
2. password is generated headless.
3. TODO: How would we map/generate User.LoginName ?
4. TODO: How would we generate ExternalLoginUser.Login* fields?
2. Getting a larger User table applies to this solution comparable to option 1.
3. Occasional contributors may not understand the difference in level of trust implied by federated user, this may promote errors with security impact.
4. Understanding federated users entries being kind of cache would conflict with user table entries.
5. LoginNames may be occupied by federated users. This may leak information and increase attack surface.
```mermaid
classDiagram
@ -209,13 +237,23 @@ classDiagram
4. User is not Admin
5. User is not Active
We can use forgejo code (like star / unstar fkt.) without changes.
#### 3. Pro
Introduce FederatedUser as new model & persistence.
1. We can use forgejo code (like star / unstar fkt.) without changes.
2. Introduce FederatedUser as new model & persistence, architectural change is medium.
3. We will be able to have a reliable mapping. Better than option 1 & 2.
But we use fields (User.EMail, User.Password) against their semantic, but we probably can handle the problems arising.
#### 3. Con
We will be able to have a reliable mapping.
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.
1. generating email having the source fqdn is impacted by email whitelists.
2. password is generated headless.
3. TODO: How would we map/generate User.LoginName ?
2. Getting a larger User table applies to this solution comparable to option 1.
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.
4. Getting a larger User table applies to this solution comparable to option 1.
5. Understanding federated users entries being kind of cache would conflict with user table entries.
6. LoginNames may be occupied by federated users. This may leak information and increase attack surface.
```mermaid
classDiagram
@ -302,11 +340,20 @@ classDiagram
1. We map PersonId.asWbfinger() to FederatedPerson.ExternalID (e.g. 13@some.instan.ce).
2. We will have no semantic mismatch.
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.
#### 4. Pro
We introduce new model & persistence.
1. We will be able to have a reliable mapping.
2. We will not use fields against their semantics.
3. We do not enhance user table with "cache entries". Forgejo stays scalable, no additional DOS surface.
4. Occasional contributors may understand a clear difference between user and federated user.
5. No LoginNames where occupied
6. Caching aspects of federated users (like refresh, evict) may be easier to implement.
We will be able to have a reliable mapping.
#### 4. Con
1. We can use forgejo code (like star / unstar fkt.) after refactorings only.
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.
3. We introduce new model & persistence.
```mermaid
classDiagram
@ -380,4 +427,4 @@ classDiagram
FederationHost *-- NodeInfo
FederatedPerson -- FederationHost
FederatedPerson ..<| CommonUser
```
```