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sign-request.py modified for python 3.x
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#!/usr/bin/env python | |
# -What------------------------------------------------------------------------- | |
# This script creates a request to the AWS Security Token Service API | |
# with the action "GetCallerIdentity" and then signs the request using the | |
# AWS credentials. It was modified from the python 2.x example published by | |
# J. Thompson, the author of the Vault IAM auth method, at the vault support | |
# mailing list. https://groups.google.com/forum/#!topic/vault-tool/Mfi3O-lW60I | |
# -Why-------------------------------------------------------------------------- | |
# We are using python here instead of bash to take advantage of the boto3 library | |
# which facilitates this work by an order of magnitude | |
# -What-for--------------------------------------------------------------------- | |
# This is useful for authenticating to Vault, because a client can use | |
# this script to generate this request and this request is sent with the | |
# login attempt to the Vault server. Vault then executes this request and gets | |
# the response from GetCallerIdentity, which tells who is trying to authenticate | |
# ------------------------------------------------------------------------------ | |
import base64 | |
import botocore.session | |
import json | |
import sys | |
def headers_to_go_style(headers): | |
retval = {} | |
for k, v in headers.items(): | |
if isinstance(v, bytes): | |
retval[k] = [str(v, 'utf-8')] | |
else: | |
retval[k] = [v] | |
return retval | |
def generate_vault_request(awsIamServerId): | |
session = botocore.session.get_session() | |
client = session.create_client('sts') | |
endpoint = client._endpoint | |
operation_model = client._service_model.operation_model('GetCallerIdentity') | |
request_dict = client._convert_to_request_dict({}, operation_model) | |
request_dict['headers']['X-Vault-AWS-IAM-Server-ID'] = awsIamServerId | |
request = endpoint.create_request(request_dict, operation_model) | |
return { | |
'iam_http_request_method': request.method, | |
'iam_request_url': str(base64.b64encode(bytes(request.url, 'utf-8')), 'utf-8'), | |
'iam_request_body': str(base64.b64encode(bytes(request.body, 'utf-8')), 'utf-8'), | |
'iam_request_headers': str(base64.b64encode(bytes(json.dumps(headers_to_go_style(dict(request.headers))), 'utf-8')), 'utf-8') # It's a CaseInsensitiveDict, which is not JSON-serializable | |
} | |
if __name__ == "__main__": | |
awsIamServerId = sys.argv[1] | |
print json.dumps(generate_vault_request(awsIamServerId)) |
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