Cause (Documented platform behavior): SSRF/credential-abuse hardening: client-supplied api_base and AWS identity selectors could redirect or sign requests with proxy credentials, so they require admin opt-in.
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/BerriAI/litellm/22b36cbcf6583e2d6b552cc0e87ae6ab82c46341/litellm/proxy/auth/auth_utils.py (official_docs, unknown, documented_behavior): _BANNED_REQUEST_BODY_PARAMS includes api_base, base_url, user_config and AWS identity selectors; raises ValueError unless allow_client_side_credentials or configurable_clientside_auth_params permits the param.
- https://raw.githubusercontent.com/BerriAI/litellm-docs/main/docs/proxy/clientside_auth.md (official_docs, unknown, documented_behavior): Clientside auth docs: enable per-provider configurable_clientside_auth_params (api_base with regex, api_key, base_url) to let users pass their own keys/base URLs.
Search phrasings: litellm Rejected Request api_base is not allowed in request body; litellm allow_client_side_credentials; litellm configurable_clientside_auth_params
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Requests from SDKs/agents that forward per-request provider base URLs or AWS identity fields are rejected by the proxy.
- Context
- Product: LiteLLM Proxy Component: proxy auth_utils banned request-body params Operation: Client sends api_base, base_url, user_config, aws_role_name/aws_profile_name/aws_sts_endpoint etc. in a /chat/completions body Affected versions: unknown Environment: unknown Exception: ValueError Packages: litellm source checked at main (see source SHA) Trigger: Request body contains a banned client-side credential/routing param without proxy-wide or per-deployment opt-in.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- is not allowed in request body. Clientside passthrough requires explicit admin opt-in via either `general_settings.allow_client_side_credentials = true` (proxy-wide) or `configurable_clientside_auth_params` on the deployment in your proxy config.yaml.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [LiteLLM Proxy] ValueError "Rejected Request: api_base is not allowed in request body. Clientside passthrough requires explicit admin opt-in" (api_base/base_url/aws_* in request body)
Recommended action: Remove these fields from client requests, or allow specific params per deployment with configurable_clientside_auth_params (supports regex for api_base); allow_client_side_credentials=true only if all clients are trusted.
Option: Opt in per deployment with configurable_clientside_auth_params [evidence: official_recommended_action]
Applies when: Deployments that must accept user base URLs/keys
Steps:
1. model_list[].litellm_params.configurable_clientside_auth_params: [{"api_base": "^https://trusted\\.example/v1$"}]
Expected: Only matching client-side params accepted
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- bf9dc621-f7ee-4dbb-9fe4-caca57aab029
- Proposed action
- Recommended action: Remove these fields from client requests, or allow specific params per deployment with configurable_clientside_auth_params (supports regex for api_base); allow_client_side_credentials=true only if all clients are trusted. Option: Opt in per deployment with configurable_clientside_auth_params [evidence: official_recommended_action] Applies when: Deployments that must accept user base URLs/keys Steps: 1. model_list[].litellm_params.configurable_clientside_auth_params: [{"api_base": "^https://trusted\\.example/v1$"}] Expected: Only matching client-side params accepted
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.