Hey Ravish,
To confirm -> it sounds like you want to have a user that is not a Security Analyst (or a traditional SIR user), to have limited access to certain SIR records? Are you potentially re-assigning these SIR records to these "external" folks", or creating Security Response Tasks (SITs)?
I don't believe using <sn_si.external> will solve that for you, however <sn_si.special_access> might partially get you there.
sn_si.external
Using <sn_si.external>, you would need to assign this <role> to SN Groups that you anticipate creating / assigning Security Incident Response Tasks to. So if you have an SIR, you can create multiple SITs (Response Tasks) to External Teams (e.g. Task to block an IP addr, or disable an account, etc).
You would not be assigning an SIR record to these Groups; you would be creating Response Tasks from the SIR, and assigning those to these Teams.
The baseline SIR functionality, is that you must assign the SIT to an actual Assignment group AND Assigned to {user}. Also, these users would not be able to navigate to the SIR record, that the SIT (Response Task) was created for.
There is an ACL entry on Response Tasks for users with <sn_si.external> -> which only allows them to see Response Tasks that are assigned to them at the {user} layer.
They will nav to "My work"... to see their relevant SITs (Response Tasks).
sn_si.special_access
Using <sn_si.special_access>, there is no need to explicitly assign this <role> to a Group or User.
When you navigate to an SIR record, and look at the "special permissions" fields such as `Read access` and `Privileged access` -> by putting a user into these fields, the system will automatically grant them this role. Then, when that user logs into SN, they have a limited view into the SIR app (even without having any sn_si.* <roles>).
These users will only be able either 'read' or 'edit' explicit SIR records, where they have been granted access to -> i.e. `Read access` and `Privileged access`.
They will nav to "Security Incident" -> "Incidents" -> "Visible to me"... to see their relevant SIRs.
Reference - sn_si.special_access
Reference - sn_si.external
