passlib.apache - Apache Password Files

This module provides utilities for reading and writing Apache’s htpasswd and htdigest files; though the use of two helper classes.

Changed in version 1.6: The api for this module was updated to be more flexible, and to have less ambiguous method names. The old method and keyword names are deprecated, and will be removed in Passlib 1.8. No more backwards-incompatible changes are currently planned for these classes.

Htpasswd Files

The HTpasswdFile class allows managing of htpasswd files. A quick summary of it’s usage:

>>> from passlib.apache import HtpasswdFile

>>> # when creating a new file, set to new=True, add entries, and save.
>>> ht = HtpasswdFile("test.htpasswd", new=True)
>>> ht.set_password("someuser", "really secret password")
>>> ht.save()

>>> # loading an existing file to update a password
>>> ht = HtpasswdFile("test.htpasswd")
>>> ht.set_password("someuser", "new secret password")
>>> ht.save()

>>> # examining file, verifying user's password
>>> ht = HtpasswdFile("test.htpasswd")
>>> ht.users()
[ "someuser" ]
>>> ht.check_password("someuser", "wrong password")
False
>>> ht.check_password("someuser", "new secret password")
True

>>> # making in-memory changes and exporting to string
>>> ht = HtpasswdFile()
>>> ht.set_password("someuser", "mypass")
>>> ht.set_password("someuser", "anotherpass")
>>> print ht.to_string()
someuser:$apr1$T4f7D9ly$EobZDROnHblCNPCtrgh5i/
anotheruser:$apr1$vBdPWvh1$GrhfbyGvN/7HalW5cS9XB1

class passlib.apache.HtpasswdFile(path=None, new=False, autosave=False, ...)

class for reading & writing Htpasswd files.

The class constructor accepts the following arguments:

Parameters:

• path (filepath) –

  Specifies path to htpasswd file, use to implicitly load from and save to.

  This class has two modes of operation:

  1. It can be “bound” to a local file by passing a path to the class constructor. In this case it will load the contents of the file when created, and the load() and save() methods will automatically load from and save to that file if they are called without arguments.
  2. Alternately, it can exist as an independant object, in which case load() and save() will require an explicit path to be provided whenever they are called. As well, autosave behavior will not be available.

     This feature is new in Passlib 1.6, and is the default if no path value is provided to the constructor.

  This is also exposed as a readonly instance attribute.

• new (bool) –

  Normally, if path is specified, HtpasswdFile will immediately load the contents of the file. However, when creating a new htpasswd file, applications can set new=True so that the existing file (if any) will not be loaded.

  New in version 1.6: This feature was previously enabled by setting autoload=False. That alias has been deprecated, and will be removed in Passlib 1.8

• autosave (bool) –

  Normally, any changes made to an HtpasswdFile instance will not be saved until save() is explicitly called. However, if autosave=True is specified, any changes made will be saved to disk immediately (assuming path has been set).

  This is also exposed as a writeable instance attribute.

• encoding (str) –

  Optionally specify character encoding used to read/write file and hash passwords. Defaults to utf-8, though latin-1 is the only other commonly encountered encoding.

  This is also exposed as a readonly instance attribute.

• default_scheme (str) –

  Optionally specify default scheme to use when encoding new passwords. Must be one of "apr_md5_crypt", "des_crypt", "ldap_sha1", "plaintext". It defaults to "apr_md5_crypt".

  New in version 1.6: This keyword was previously named default. That alias has been deprecated, and will be removed in Passlib 1.8.

• context (CryptContext) –

  CryptContext instance used to encrypt and verify the hashes found in the htpasswd file. The default value is a pre-built context which supports all of the hashes officially allowed in an htpasswd file.

  This is also exposed as a readonly instance attribute.

  Warning

  This option may be used to add support for non-standard hash formats to an htpasswd file. However, the resulting file will probably not be usuable by another application, and particularly not by Apache.

• autoload –

  Set to False to prevent the constructor from automatically loaded the file from disk.

  Deprecated since version 1.6: This has been replaced by the new keyword. Instead of setting autoload=False, you should use new=True. Support for this keyword will be removed in Passlib 1.8.

• default –

  Change the default algorithm used to encrypt new passwords.

  Deprecated since version 1.6: This has been renamed to default_scheme for clarity. Support for this alias will be removed in Passlib 1.8.

Loading & Saving

load(path=None, force=True)

Load state from local file. If no path is specified, attempts to load from self.path.

Parameters:

• path (str) – local file to load from
• force (bool) –

  if force=False, only load from self.path if file has changed since last load.

  Deprecated since version 1.6: This keyword will be removed in Passlib 1.8; Applications should use load_if_changed() instead.

load_if_changed()

Reload from self.path only if file has changed since last load

load_string(data)

Load state from unicode or bytes string, replacing current state

save(path=None)

Save current state to file. If no path is specified, attempts to save to self.path.

to_string()

Export current state as a string of bytes

Inspection

users()

Return list of all users in database

check_password(user, password)

Verify password for specified user.

Returns:

• None if user not found.
• False if user found, but password does not match.
• True if user found and password matches.

Changed in version 1.6: This method was previously called verify, it was renamed to prevent ambiguity with the CryptContext method. The old alias is deprecated, and will be removed in Passlib 1.8.

get_hash(user)

Return hash stored for user, or None if user not found.

Changed in version 1.6: This method was previously named find, it was renamed for clarity. The old name is deprecated, and will be removed in Passlib 1.8.

Modification

set_password(user, password)

Set password for user; adds user if needed.

Returns:

• True if existing user was updated.
• False if user account was added.

Changed in version 1.6: This method was previously called update, it was renamed to prevent ambiguity with the dictionary method. The old alias is deprecated, and will be removed in Passlib 1.8.

delete(user)

Delete user’s entry.

Returns:

• True if user deleted.
• False if user not found.

Alternate Constructors

classmethod from_string(data, **kwds)

create new object from raw string.

Parameters:

• data (unicode or bytes) – database to load, as single string.
• **kwds – all other keywords are the same as in the class constructor

Attributes

path

Path to local file that will be used as the default for all load() and save() operations. May be written to, initialized by the path constructor keyword.

autosave

Writeable flag indicating whether changes will be automatically written to path.

Errors

raises ValueError:  All of the methods in this class will raise a ValueError if any user name contains a forbidden character (one of :\r\n\t\x00), or is longer than 255 characters.

Htdigest Files

The HtdigestFile class allows management of htdigest files in a similar fashion to HtpasswdFile.

class passlib.apache.HtdigestFile(path, default_realm=None, new=False, autosave=False, ...)

class for reading & writing Htdigest files.

The class constructor accepts the following arguments:

Parameters:

• path (filepath) –

  Specifies path to htdigest file, use to implicitly load from and save to.

  This class has two modes of operation:

  1. It can be “bound” to a local file by passing a path to the class constructor. In this case it will load the contents of the file when created, and the load() and save() methods will automatically load from and save to that file if they are called without arguments.
  2. Alternately, it can exist as an independant object, in which case load() and save() will require an explicit path to be provided whenever they are called. As well, autosave behavior will not be available.

     This feature is new in Passlib 1.6, and is the default if no path value is provided to the constructor.

  This is also exposed as a readonly instance attribute.

• default_realm (str) –

  If default_realm is set, all the HtdigestFile methods that require a realm will use this value if one is not provided explicitly. If unset, they will raise an error stating that an explicit realm is required.

  This is also exposed as a writeable instance attribute.

  New in version 1.6.

• new (bool) –

  Normally, if path is specified, HtdigestFile will immediately load the contents of the file. However, when creating a new htpasswd file, applications can set new=True so that the existing file (if any) will not be loaded.

  New in version 1.6: This feature was previously enabled by setting autoload=False. That alias has been deprecated, and will be removed in Passlib 1.8

• autosave (bool) –

  Normally, any changes made to an HtdigestFile instance will not be saved until save() is explicitly called. However, if autosave=True is specified, any changes made will be saved to disk immediately (assuming path has been set).

  This is also exposed as a writeable instance attribute.

• encoding (str) –

  Optionally specify character encoding used to read/write file and hash passwords. Defaults to utf-8, though latin-1 is the only other commonly encountered encoding.

  This is also exposed as a readonly instance attribute.

• autoload –

  Set to False to prevent the constructor from automatically loaded the file from disk.

  Deprecated since version 1.6: This has been replaced by the new keyword. Instead of setting autoload=False, you should use new=True. Support for this keyword will be removed in Passlib 1.8.

Loading & Saving

load(path=None, force=True)

Load state from local file. If no path is specified, attempts to load from self.path.

Parameters:

• path (str) – local file to load from
• force (bool) –

  if force=False, only load from self.path if file has changed since last load.

  Deprecated since version 1.6: This keyword will be removed in Passlib 1.8; Applications should use load_if_changed() instead.

load_if_changed()

Reload from self.path only if file has changed since last load

load_string(data)

Load state from unicode or bytes string, replacing current state

save(path=None)

Save current state to file. If no path is specified, attempts to save to self.path.

to_string()

Export current state as a string of bytes

Inspection

realms()

Return list of all realms in database

users(realm=None)

Return list of all users in specified realm.

• uses self.default_realm if no realm explicitly provided.
• returns empty list if realm not found.

check_password(user[, realm], password)

Verify password for specified user + realm.

If self.default_realm has been set, this may be called with the syntax check_password(user, password), otherwise it must be called with all three arguments: check_password(user, realm, password).

Returns:

• None if user or realm not found.
• False if user found, but password does not match.
• True if user found and password matches.

Changed in version 1.6: This method was previously called verify, it was renamed to prevent ambiguity with the CryptContext method. The old alias is deprecated, and will be removed in Passlib 1.8.

get_hash(user, realm=None)

Return htdigest hash stored for user.

• uses self.default_realm if no realm explicitly provided.
• returns None if user or realm not found.

Changed in version 1.6: This method was previously named find, it was renamed for clarity. The old name is deprecated, and will be removed in Passlib 1.8.

Modification

set_password(user[, realm], password)

Set password for user; adds user & realm if needed.

If self.default_realm has been set, this may be called with the syntax set_password(user, password), otherwise it must be called with all three arguments: set_password(user, realm, password).

Returns:

• True if existing user was updated
• False if user account added.

delete(user, realm=None)

Delete user’s entry for specified realm.

if realm is not specified, uses self.default_realm.

Returns:

• True if user deleted,
• False if user not found in realm.

delete_realm(realm)

Delete all users for specified realm.

if realm is not specified, uses self.default_realm.

Returns:number of users deleted (0 if realm not found)

Alternate Constructors

classmethod from_string(data, **kwds)

create new object from raw string.

Parameters:

• data (unicode or bytes) – database to load, as single string.
• **kwds – all other keywords are the same as in the class constructor

Attributes

default_realm

The default realm that will be used if one is not provided to methods that require it. By default this is None, in which case an explicit realm must be provided for every method call. Can be written to.

path

Path to local file that will be used as the default for all load() and save() operations. May be written to, initialized by the path constructor keyword.

autosave

Writeable flag indicating whether changes will be automatically written to path.

Errors

raises ValueError:  All of the methods in this class will raise a ValueError if any user name or realm contains a forbidden character (one of :\r\n\t\x00), or is longer than 255 characters.

Footnotes

[1]	Htpasswd Manual - http://httpd.apache.org/docs/current/programs/htpasswd.html

[2]	Apache Auth Configuration - http://httpd.apache.org/docs/current/howto/auth.html