Need of Custom Role(s) in SSRS Security Model

1)  
Predefined
Role(s) in SSRS

Reporting Services installs with
predefined roles that you can use to grant access to report server operations.
Each predefined role describes a collection of related tasks. You can assign
groups and user accounts to predefined roles to provide immediate access to
report server operations.

We can assign user accounts/groups to predefined roles to
provide immediate access to report server operations. Following is the pre-defined role(s) available
in SSRS

Role	Type	Description
Browser Role	Item	If user or group would like to view folders, reports and subscribe to reports, you can add them to Browser role.
Content Manager	Item	If user or group need to manage contents in Report Server you can add them to Content Manager Role. They will be able to manager folders, reports and other resources.
My Reports	Item	If user or group is added to this role, they will be able to publish report, create linked reports, manager folders, reports and resources in user’s My Report Folder.
Publisher	Item	If we want our user/group to have publish permissions, we can add user/group to this role and they will be able to publish report and linked report to report server.
Report Builder	Item	If we have users who often need to view the definition of reports by using Report Builder, we can add those users in this role.
System Administrator	System	Users who are assigned to this role can enable features and set defaults, set site-wide security, create role definitions in Management Studio, and manage jobs.
System User Role	System	Users who are assigned to this role can view basic information about the report server such as the schedule information in a shared schedule.

2)  
Need of
Custom Role(s) in SSRS

Based on the business requirement(s), we may need to create some
unique roles with specific set of permissions e.g . Schedule Administrator who should be responsible for
subscription, Report Caching, Report Snapshot & Report History only. In this
case, we need to create a role with only those permission required for
subscription, snapshot/caching.

3)  
How to
create  custom Role in SSRS

      
Following are the steps to create a role in SSRS

            1.       Connect to
SQL Server Reporting Service instance using Management studio

            2.       Go to
Security FolderèRoles

          3.       Right
Click on the Rolesè New Role

        4.       Type a
unique name for the role & optionally type a description.

      5.       Select
the tasks that members of this role can perform. Click Ok

                 
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