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Taikun OCP Guide

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Case-Insensitivity in keystone

Keystone currently handles the case-sensitivity for the naming of
each resource a bit differently, depending on the resource itself, and
the backend used. For example, depending on whether a user is backed by
local SQL or LDAP, the case-sensitivity can be different. When it is
case-insensitive, the casing will be preserved. For instance, a project
with the name “myProject” will not end up changing to either all lower
or upper case.

Resources in keystone

Below are examples of case-insensitivity in keystone for users,
projects, and roles.

Users

If a user with the name “MyUser” already exists, then the following
call which creates a new user by the name of “myuser” will return a
409 Conflict:

POST /v3/users
{
    "user": {
        "name": "myuser"
    }
}

Projects

If a project with the name “Foobar” already exists, then the
following call which creates a new project by the name of “foobar” will
return a 409 Conflict:

POST /v3/projects
{
    "project": {
        "name": "foobar"
    }
}

Project Tags

While project names are case-insensitive, project tags are
case-sensitive. A tag with the value of mytag is different
than MyTag, and both values can be stored in the same
project.

Roles

Role names are case-insensitive. for example, when keystone
bootstraps default roles, it creates “admin”, “member”, and “reader”. If
another role, “Member” (note the upper case ‘M’) is created, keystone
will return a 409 Conflict since it considers the name
“Member” equivalent to “member”. Note that case is preserved in this
event.

Note

As of the Rocky release, keystone will create three default roles
when keystone-manage bootstrap is run:
(admin, member, reader). For
existing deployments, this can cause issues if an existing role matches
one of these roles. Even if the casing is not an exact match
(member vs Member), it will report an error
since roles are considered case-insensitive.

Backends

For each of these examples, we will refer to an existing project with
the name “mYpRoJeCt” and user with the name “mYuSeR”. The examples here
are exaggerated to help display the case handling for each backend.

MySQL & SQLite

By default, MySQL/SQLite are case-insensitive but case-preserving for
varchar. This means that setting a
project name of “mYpRoJeCt” will cause attempting to create a new
project named “myproject” to fail with keystone returning a
409 Conflict. However, the original value of “mYpRoJeCt”
will still be returned since case is preserved.

Users will be treated the same, if another user is added with the
name “myuser”, keystone will respond with 409 Conflict
since another user with the (same) name exists (“mYuSeR”).

PostgreSQL

PostgreSQL is case-sensitive by default, so if a project by the name
of “myproject” is created with the existing “mYpRoJeCt”, it will be
created successfully.

LDAP

By default, LDAP DNs are case-insensitive, so the example with users
under MySQL will apply here as well.

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