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oidc-exchange: render claims if exchange fails

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Signed-off-by: William Woodruff <william@trailofbits.com>
This commit is contained in:
William Woodruff 2023-08-09 15:08:47 -04:00
parent 413a8d5d62
commit 71a0032909
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1 changed files with 45 additions and 1 deletions
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46
oidc-exchange.py
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@ -1,3 +1,5 @@
import base64
import json
import os
import sys
from http import HTTPStatus
@ -50,6 +52,25 @@ _SERVER_REFUSED_TOKEN_EXCHANGE_MESSAGE = """
Token request failed: the server refused the request for the following reasons:
{reasons}
This generally indicates a trusted publisher configuration error, but could
also indicate an internal error on GitHub or PyPI's part.
{rendered_claims}
"""
_RENDERED_CLAIMS = """
The claims rendered below are **for debugging purposes only**. You should **not**
use them to configure a trusted publisher unless they already match your expectations.
If a claim is not present in the claim set, then it is rendered as `MISSING`.
* `sub`: `{sub}`
* `repository`: `{repository}`
* `repository_owner`: `{repository_owner}`
* `repository_owner_id`: `{repository_owner_id}`
* `job_workflow_ref`: `{job_workflow_ref}`
* `ref`: `{ref}`
"""
# Rendered if the package index's token response isn't valid JSON.
@ -121,6 +142,23 @@ def assert_successful_audience_call(resp: requests.Response, domain: str):
)
def render_claims(oidc_token: str) -> str:
_, payload, _ = oidc_token.split(".", 2)
claims = json.loads(base64.urlsafe_b64decode(payload))
def _get(name: str) -> str:
return claims.get(name, "MISSING")
return _RENDERED_CLAIMS.format(
sub=_get("sub"),
repository=_get("repository"),
repository_owner=_get("repository_owner"),
repository_owner_id=_get("repository_owner_id"),
job_workflow_ref=_get("job_workflow_ref"),
ref=_get("ref"),
)
repository_url = get_normalized_input("repository-url")
repository_domain = urlparse(repository_url).netloc
token_exchange_url = f"https://{repository_domain}/_/oidc/github/mint-token"
@ -165,7 +203,13 @@ if not mint_token_resp.ok:
for error in mint_token_payload["errors"]
)
die(_SERVER_REFUSED_TOKEN_EXCHANGE_MESSAGE.format(reasons=reasons))
rendered_claims = render_claims(oidc_token)
die(
_SERVER_REFUSED_TOKEN_EXCHANGE_MESSAGE.format(
reasons=reasons, rendered_claims=rendered_claims
)
)
pypi_token = mint_token_payload.get("token")
if pypi_token is None: