Resolves access control error visibility issues where 500 errors were
returned instead of proper 403 responses with actionable error messages.
• Enhance AccessDeniedError with detailed context and improve exception
handling
• Enhanced AccessDeniedError class to include user, action, and resource
context
- Added constructor parameters for action, resource, and user
- Generate detailed error messages showing user principal, attributes,
and attempted resource
- Backward compatible with existing usage (falls back to generic
message)
• Updated exception handling in server.py
- Import AccessDeniedError from access_control module
- Return proper 403 status codes with detailed error messages
- Separate handling for PermissionError (generic) vs AccessDeniedError
(detailed)
• Enhanced error context at raise sites
- Updated routing_tables/common.py to pass action, resource, and user
context
- Updated agents persistence to include context in access denied errors
- Provides better debugging information for access control issues
• Added comprehensive unit tests
- Created tests/unit/server/test_server.py with 13 test cases
- Covers AccessDeniedError with and without context
- Tests all exception types (ValidationError, BadRequestError,
AuthenticationRequiredError, etc.)
- Validates proper HTTP status codes and error message formats
# What does this PR do?
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relevant issues if applicable. -->
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## Test Plan
```
server:
port: 8321
access_policy:
- permit:
principal: admin
actions: [create, read, delete]
when: user with admin in groups
- permit:
actions: [read]
when: user with system:authenticated in roles
```
then:
```
curl --request POST --url http://localhost:8321/v1/vector-dbs \
--header "Authorization: Bearer your-bearer" \
--data '{
"vector_db_id": "my_demo_vector_db",
"embedding_model": "ibm-granite/granite-embedding-125m-english",
"embedding_dimension": 768,
"provider_id": "milvus"
}'
```
depending if user is in group admin or not, you should get the
`AccessDeniedError`. Before this PR, this was leading to an error 500
and `Traceback` displayed in the logs.
After the PR, logs display a simpler error (unless DEBUG logging is set)
and a 403 Forbidden error is returned on the HTTP side.
---------
Signed-off-by: Akram Ben Aissi <<akram.benaissi@gmail.com>>
This allows a set of rules to be defined for determining access to
resources. The rules are (loosely) based on the cedar policy format.
A rule defines a list of action either to permit or to forbid. It may
specify a principal or a resource that must match for the rule to take
effect. It may also specify a condition, either a 'when' or an 'unless',
with additional constraints as to where the rule applies.
A list of rules is held for each type to be protected and tried in order
to find a match. If a match is found, the request is permitted or
forbidden depening on the type of rule. If no match is found, the
request is denied. If no rules are specified for a given type, a rule
that allows any action as long as the resource attributes match the user
attributes is added (i.e. the previous behaviour is the default.
Some examples in yaml:
```
model:
- permit:
principal: user-1
actions: [create, read, delete]
comment: user-1 has full access to all models
- permit:
principal: user-2
actions: [read]
resource: model-1
comment: user-2 has read access to model-1 only
- permit:
actions: [read]
when:
user_in: resource.namespaces
comment: any user has read access to models with matching attributes
vector_db:
- forbid:
actions: [create, read, delete]
unless:
user_in: role::admin
comment: only user with admin role can use vector_db resources
```
---------
Signed-off-by: Gordon Sim <gsim@redhat.com>
