Ubuntu Manpage: WebAuth - Perl extension for WebAuth

Provided by: libwebauth-perl_4.5.5-2_amd64

NAME

       WebAuth - Perl extension for WebAuth

SYNOPSIS

           use WebAuth;

           my $wa = WebAuth->new;
           eval {
               $key = $wa->random_key(WebAuth::WA_AES_128);
               ...
           };
           if ($@) {
               # handle exception
           }

DESCRIPTION

       WebAuth is a low-level Perl interface into the WebAuth C API.  It mostly follows the C API
       but rearranges the calls into an object-oriented structure and changes the behavior of
       some methods to be more Perl-like.

       Before calling any of the functions, obtain a new WebAuth object with "WebAuth->new".  All
       subsequent functions take that object as their first parameter, or should be called as
       methods on that object, and other returned objects will normally have that context as
       hidden data.  This object represents the WebAuth context.  If the WebAuth object goes out
       of scope, all other objects created from it, such as keys and keyrings, will also become
       invalid.  The caller therefore must be careful to ensure that no references to other
       objects are kept around after the WebAuth object is destroyed.

       All and methods functions have the potential to croak with a WebAuth::Exception object, so
       an eval block should be placed around calls to WebAuth functions if you intend to recover
       from errors.  See WebAuth::Exception for more information.

       In some cases, objects in other classes may be returned by methods.  Those classes are
       documented in their own manual or POD pages.

EXPORT

       Nothing is exported by default, but the following export tags are available:

       const   Exports the WA_* constants.  For a complete list, see "CONSTANTS".

       To import all constants, use:

           use WebAuth qw(:const);

       Individual constants can be imported instead, of course.

CLASS METHODS

       As described above, on any error not explicitly documented below, these methods will throw
       a WebAuth::Exception object.

       new ()
           Create a new WebAuth context object and return it.  Remember that all other objects
           created from this context, such as keys, keyrings, and tokens, will be destroyed when
           this context is destroyed, even though Perl isn't aware of this.

INSTANCE METHODS

As described above, on any error not explicitly documented below, these methods will throw
a WebAuth::Exception object.

error_message (STATUS)
Returns an error message string corresponding to STATUS, which should be one of the
WA_ERR_* values. It's rare to need to use this method, since generally any error
return from the WebAuth C API is converted into a WebAuth::Exception and thrown
instead, and the WebAuth::Exception object will contain a more detailed error message.

key_create (TYPE, SIZE[, KEY_MATERIAL])
Create a new WebAuth::Key object. TYPE currently must be WA_KEY_AES, and SIZE must be
one of WA_AES_128, WA_AES_192, or WA_AES_256. This may change in the future if
WebAuth gains support for additional key types.

If KEY_MATERIAL is given, it should contain SIZE bytes of data, which will be used as
the key. If KEY_MATERIAL is not given or is undef, a new random key of the specified
TYPE and SIZE will be generated.

The WebAuth::Key object will be destroyed when the WebAuth context used to create it
is destroyed, and subsequent accesses to it may cause memory access errors or other
serious bugs. Be careful not to retain a copy of a WebAuth::Key object after the
WebAuth object that created it has been destroyed.

keyring_new (KEY)
keyring_new (SIZE)
Create a new WebAuth::Keyring object. This object holds WebAuth::Key objects and is
used for token encryption and decryption.

The argument to this method may be either a WebAuth::Key object or a numeric size. If
a WebAuth::Key object is provided, a new keyring containing only that key will be
created and returned. If a size is provided, a new, empty keyring with space
preallocated to hold that many keys is created and returned. (Regardless of the
allocated size of a keyring, keyrings will always dynamically expand to hold any new
keys that are added to them.)

The WebAuth::Keyring object will be destroyed when the WebAuth context used to create
it is destroyed, and subsequent accesses to it may cause memory access errors or other
serious bugs. Be careful not to retain a copy of a WebAuth::Keyring object after the
WebAuth object that created it has been destroyed.

keyring_decode (DATA)
Create a new WebAuth::Keyring object by decoding DATA, which should be a keyring in
its serialization format (as read from a file written by WebAuth::Keyring->write or
encoded with WebAuth::Keyring->encode). All the caveats about the lifetime of the
WebAuth::Keyring object mentioned for keyring_new() also apply here.

keyring_read (FILE)
Create a new WebAuth::Keyring object by reading its contents from the provided file.
The created keyring object will have no association with the file after being created;
it won't automatically be saved, or updated when the file changes. All the caveats
about the lifetime of the WebAuth::Keyring object mentioned for keyring_new() also
apply here.

krb5_new ()
Create a new WebAuth::Krb5 object and return it. This is used as a context for all
Kerberos-related WebAuth calls. See WebAuth::Krb5 for supported methods.

token_decode (INPUT, KEYRING)
Given an encrypted and base64-encoded token, decode and decrypt it using the provided
WebAuth::Keyring object. The return value will be a subclass of WebAuth::Token. See
WebAuth::Token for common methods and a list of possible token object types.

Callers will normally want to check via isa() whether the returned token is of the
type that the caller expected. Not performing that check can lead to security issues.

token_decrypt (INPUT, KEYRING)
Decrypt the input string, which should be raw encrypted token data (not
base64-encoded), using the provided keyring and return the decrypted data.

This provides access to the low-level token decryption routine and should not normally
be used. It's primarily available to aid in constructing test suites. token_decode()
should normally be used instead.

token_encrypt (INPUT, KEYRING)
Encrypt the input string, which should be raw token attribute data, using the provided
keyring and return the encrypted data. The encryption key used will be the one
returned by the best_key() method of WebAuth::Keyring on that KEYRING.

This provides access to the low-level token encryption routine and should not normally
be used. It's primarily available to aid in constructing test suites. A
WebAuth::Token subclass and its encode() method should normally be used instead.

CONSTANTS

       This module also provides a variety of API constants for the WebAuth library.  WebAuth API
       status codes used both for API calls and for login errors and error tokens:

           WA_PEC_SERVICE_TOKEN_EXPIRED
           WA_PEC_SERVICE_TOKEN_INVALID
           WA_PEC_PROXY_TOKEN_EXPIRED
           WA_PEC_PROXY_TOKEN_INVALID
           WA_PEC_INVALID_REQUEST
           WA_PEC_UNAUTHORIZED
           WA_PEC_SERVER_FAILURE
           WA_PEC_REQUEST_TOKEN_STALE
           WA_PEC_REQUEST_TOKEN_INVALID
           WA_PEC_GET_CRED_FAILURE
           WA_PEC_REQUESTER_KRB5_CRED_INVALID
           WA_PEC_LOGIN_TOKEN_STALE
           WA_PEC_LOGIN_TOKEN_INVALID
           WA_PEC_LOGIN_FAILED
           WA_PEC_PROXY_TOKEN_REQUIRED
           WA_PEC_LOGIN_CANCELED
           WA_PEC_LOGIN_FORCED
           WA_PEC_USER_REJECTED
           WA_PEC_CREDS_EXPIRED
           WA_PEC_MULTIFACTOR_REQUIRED
           WA_PEC_MULTIFACTOR_UNAVAILABLE
           WA_PEC_LOGIN_REJECTED
           WA_PEC_LOA_UNAVAILABLE
           WA_PEC_AUTH_REJECTED
           WA_PEC_AUTH_REPLAY
           WA_PEC_AUTH_LOCKOUT

       Status codes used only for API calls:

           WA_ERR_NONE
           WA_ERR_NO_ROOM
           WA_ERR_CORRUPT
           WA_ERR_NO_MEM
           WA_ERR_BAD_HMAC
           WA_ERR_RAND_FAILURE
           WA_ERR_BAD_KEY
           WA_ERR_FILE_OPENWRITE
           WA_ERR_FILE_WRITE
           WA_ERR_FILE_OPENREAD
           WA_ERR_FILE_READ
           WA_ERR_FILE_VERSION
           WA_ERR_NOT_FOUND
           WA_ERR_KRB5
           WA_ERR_INVALID_CONTEXT
           WA_ERR_TOKEN_EXPIRED
           WA_ERR_TOKEN_STALE
           WA_ERR_APR
           WA_ERR_UNIMPLEMENTED
           WA_ERR_INVALID
           WA_ERR_REMOTE_FAILURE
           WA_ERR_FILE_NOT_FOUND
           WA_ERR_TOKEN_REJECTED

       Key types for key_create() and "WebAuth::Key->new":

           WA_KEY_AES

       Key sizes for key_create() and "WebAuth::Key->new":

           WA_AES_128
           WA_AES_192
           WA_AES_256

       Key usages for the best_key() method of WebAuth::Keyring:

           WA_KEY_DECRYPT
           WA_KEY_ENCRYPT

       Canonicalization modes for the get_principal() and read_auth() methods of WebAuth::Krb5:

           WA_KRB5_CANON_NONE
           WA_KRB5_CANON_LOCAL
           WA_KRB5_CANON_STRIP

AUTHOR

       Roland Schemers, Jon Robertson <jonrober@stanford.edu>, and Russ Allbery
       <rra@stanford.edu>.