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# frozen_string_literal: true
module Aws
# A credential provider that executes a given process and attempts
# to read its stdout to recieve a JSON payload containing the credentials
#
# Automatically handles refreshing credentials if an Expiration time is
# provided in the credentials payload
#
# credentials = Aws::ProcessCredentials.new('/usr/bin/credential_proc').credentials
#
# ec2 = Aws::EC2::Client.new(credentials: credentials)
#
# More documentation on process based credentials can be found here:
# https://docs.aws.amazon.com/cli/latest/topic/config-vars.html#sourcing-credentials-from-external-processes
class ProcessCredentials
include CredentialProvider
include RefreshingCredentials
# Creates a new ProcessCredentials object, which allows an
# external process to be used as a credential provider.
#
# @param [String] process Invocation string for process
# credentials provider.
def initialize(process)
@process = process
@credentials = credentials_from_process(@process)
super
end
private
def credentials_from_process(proc_invocation)
begin
raw_out = `#{proc_invocation}`
process_status = $?
rescue Errno::ENOENT
raise Errors::InvalidProcessCredentialsPayload.new("Could not find process #{proc_invocation}")
end
if process_status.success?
begin
creds_json = JSON.parse(raw_out)
rescue JSON::ParserError
raise Errors::InvalidProcessCredentialsPayload.new("Invalid JSON response")
end
payload_version = creds_json['Version']
if payload_version == 1
_parse_payload_format_v1(creds_json)
else
raise Errors::InvalidProcessCredentialsPayload.new("Invalid version #{payload_version} for credentials payload")
end
else
raise Errors::InvalidProcessCredentialsPayload.new('credential_process provider failure, the credential process had non zero exit status and failed to provide credentials')
end
end
def _parse_payload_format_v1(creds_json)
creds = Credentials.new(
creds_json['AccessKeyId'],
creds_json['SecretAccessKey'],
creds_json['SessionToken']
)
@expiration = creds_json['Expiration'] ? Time.iso8601(creds_json['Expiration']) : nil
return creds if creds.set?
raise Errors::InvalidProcessCredentialsPayload.new("Invalid payload for JSON credentials version 1")
end
def refresh
@credentials = credentials_from_process(@process)
end
def near_expiration?
# are we within 5 minutes of expiration?
@expiration && (Time.now.to_i + 5 * 60) > @expiration.to_i
end
end
end
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