VM::EC2::Security::Token - Temporary security token object
use VM::EC2; use VM::EC2::Security::Policy # under your account $ec2 = VM::EC2->new(...); # as usual my $policy = VM::EC2::Security::Policy->new; $policy->allow('DescribeImages','RunInstances'); my $token = $ec2->get_federation_token(-name => 'TemporaryUser', -duration => 60*60*3, # 3 hrs, as seconds -policy => $policy); print $token->sessionToken,"\n"; print $token->accessKeyId,"\n"; print $token->secretAccessKey,"\n"; print $token->federatedUser,"\n"; my $serialized = $token->credentials->serialize; # get the serialized token to the temporary user send_data_to_user_somehow($serialized); # under the temporary user's account my $serialized = get_data_somehow(); # create a copy of the token from its serialized form my $token = VM::EC2::Security::Credentials->new_from_serialized($serialized); # open a new EC2 connection with this token. User will be # able to run all the methods specified in the policy. my $ec2 = VM::EC2->new(-security_token => $token); print $ec2->describe_images(-owner=>'self');
VM::EC2::Security::Token objects allow you to grant a user access to some or all of your EC2 resources for a limited period of time. The user does not have to have his own AWS account.
Token objects are returned by calls to VM::EC2->get_federation_token() and get_session_token(). The former call is used to create a temporary user with privileges restricted to those listed in the accompanying policy (a VM::EC2::Security::Policy object). The latter call is used in conjunction with multi-factor authentication devices, such as smart cards. The tokens returned by get_session_token() are not associated with a user account nor a policy, and grant privileges to all EC2 actions and resources. Both federation and session tokens have an expiry time between a few seconds and 36 hours.
A VM::EC2::Security::Credentials object contained within the token contains the temporary secret access key, acess key ID, and a session token string that unlocks the access key. The credentials object can be serialized into a form suitable for sending to a user via a secure channel, such as SSL or S/MIME e-mail, and unserialized at the receiving end into a copy of the original credentials object.
Either the token object, or its contained credentials object can be used passed to VM::EC2->new() via the -security_token parameter in order to gain access to EC2 resources.
credentials() -- The VM::EC2::Security::Credentials object that contains the session token, access key ID, and secret key. federatedUser() -- the VM::EC2::Security::FederatedUser object that contains information about the temporary user account. packedPolicySize() -- A percentage value indicating the size of the policy in packed form relative to the maximum allowed size. Policies in excess of 100% will be rejected by the service. secret_access_key()-- Convenience method that calls the credentials object's secret_access_key() method. access_key_id() -- Convenience method that calls the credentials object's access_key_id() method. session_token() -- Convenience method that calls the credentials object's session_token() method.
When used in a string context, this object will interpolate as the session token, and can be used for the -security_token parameter in VM::EC2->new().
Lincoln Stein <firstname.lastname@example.org>.
Copyright (c) 2011 Ontario Institute for Cancer Research
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