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Copyright (c) 2013 Isis Lovecruft
Copyright (c) 2008-2012 by Vinay Sajip.
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# python-gnupg # # python-gnupg #
================
Fork of python-gnupg-0.3.2, patched to remove ```Popen([...], shell=True)```. Fork of [python-gnupg-0.3.2](https://code.google.com/p/python-gnupg/), patched
to fix a potential vulnerability which could result in remote code execution,
do to unsanitised inputs being passed to ```subprocess.Popen([...], shell=True)```.
### Installation ### ### Installation ###
#### From [PyPI](https://pypi.python.org) ####
It's simple. Just do:
```
[sudo] pip install gnupg
```
#### From this git repository #### #### From this git repository ####
To install this package from this git repository, do: To install this package from this git repository, do:
@ -50,14 +57,15 @@ Name-Real: Autogenerated Key
``` ```
#### From PyPI ####
Hold your horses, boy. I haven't finished development, so the packages on
[PyPI](https://pypi.python.org) are still the old versions belonging to the
other authors.
### Bug Reports & Feature Requests ### ### Bug Reports & Feature Requests ###
Our bugtracker is [here](https://leap.se/code/projects/eip_server/issue/new).
Please use that for bug reports and feature requests instead of github's Currently, the bugtracker is
tracker. We're using github for code commenting and review between [here](https://github.com/isislovecruft/python-gnupg/issues) on Github. This
collaborators. may change in the future, but for now please feel free to use it to make
bugreports and feature requests.
Public comments and discussions are also welcome on the bugtracker, or as
[tweets](https://twitter.com/isislovecruft).
Patches are greatly appreciated, and if unsuitable for merging I will make
improvement suggestions based on code review until the patch is acceptable.

1
TODO
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@ -1 +0,0 @@
docs/TODO

114
TODO 100644
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@ -0,0 +1,114 @@
-*- mode: org -*-
* Keyring separation :keyseparation:
** TODO in GPG.gen_key() :keyseparation:gen_key:
It would be nice to have an option for gen_key() [[gnupg.py:927]] to
automatically switch before key generation to a new tempfile.mkdtemp()
directory, with a new keyring and secring, and then to rename either the
directory or the keyrings with the long keyid of the key which was freshly
generated.
* I/O :io:
** TODO in GPG.__make_args() :io:makeargs:
It would be nice to make the file descriptors for communication with the GnuPG
process configurable, and not the default, hard-coded 0=stdin 1=stdout
2=stderr.
** TODO look into RDBMS/ORM for public key storage :io:db:
see http://stackoverflow.com/q/1235594 and http://elixir.ematia.de/trac/wiki
memcached and pymemcached were the first ones I looked at, then I discovered
redis, which seemed better. At some point we should look into using elixer,
mentioned in the above SO post, so that the backend DB can be chosen freely
and we´re not restricting users to only memcached/cassandra/redis/sqlite/etc.
* Key editing :editkey:
** TODO add '--edit-key' feature :editkey:
see :compatibility:gen__key_input:
* Compatibility between GnuPG versions :compatibility:
** TODO GnuPG>=2.1.0 won't allow key generation with preset passphrase
*** TODO in GPG.gen__key_input() :compatibility:gen_key_input:
In the docstring of GPG.gen__key_input() [[gnupg.py:1068]], for the parameter
'passphrase', it is explained that:
:param str passphrase: The passphrase for the new key. The default is
to not use any passphrase. Note that
GnuPG>=2.1.x will not allow you to specify a
passphrase for batch key generation -- GnuPG
will ignore the ``passphrase`` parameter, stop,
and ask the user for the new passphrase.
However, we can put the command '%no-protection'
into the batch key generation file to allow a
passwordless key to be created, which can then
have its passphrase set later with '--edit-key'.
If we add a GnuPG version detection feature (the version string is already
obtained in GPG.___init___() [[gnupg.py:407]]), then we can automatically chain
GPG.gen__key_input() to another new feature for '--edit-key'. This chaining
would likely need to happen here [[gnupg.py:1146]].
*** TODO add '--edit-key' feature :editkey:
This would be necessary for adding a passphrase to the key after passwordless
generation in GnuPG>=2.1.0.
** TODO GnuPG==1.4.12 doesn't process "Key-Type: default" in batch files
(python-gnupg)∃!isisⒶwintermute:~/code/riseup/python-gnupg ∴ ipython
WARNING: Attempting to work in a virtualenv. If you encounter problems, please install IPython inside the virtualenv.
In [1]: import gnupg
GnuPG logging disabled...
In [2]: gpg = gnupg.GPG(homedir='./tests/doctests')
In [3]: key_input = gpg.gen_key_input()
In [4]: print key_input
Key-Type: default
Key-Length: 4096
Subkey-Type: default
Name-Email: isis@wintermute
Expire-Date: 2014-05-28
Name-Real: Autogenerated Key
%commit
In [5]: key = gpg.gen_key(key_input)
In [6]: print key.stderr
gpg: -:1: invalid algorithm
[GNUPG:] KEY_NOT_CREATED
In [7]: quit()
(python-gnupg)∃!isisⒶwintermute:~/code/riseup/python-gnupg ∴ which gpg
/usr/bin/gpg
(python-gnupg)∃!isisⒶwintermute:~/code/riseup/python-gnupg ∴ gpg --version
gpg (GnuPG) 1.4.12
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Home: ~/.gnupg
Supported algorithms:
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA
Cipher: 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH, CAMELLIA128,
CAMELLIA192, CAMELLIA256
Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
Compression: Uncompressed, ZIP, ZLIB, BZIP2
(python-gnupg)∃!isisⒶwintermute:~/code/riseup/python-gnupg ∴
* Code cleanup :cleanup:
** TODO in parsers.__sanitise() :cleanup:sanitise:
Ughh...this is the ugliest code I think I've ever written. It works, but I
worry that it is fragile, not to mention *I* have trouble reading it, and I
fucking wrote the damn thing. There's probably not much that could be done to
make it more Pythonic, because type checks and input validation are pretty much
intrinsically non-Pythonic. But did i mention that it's ugly? I'm sure these
functions would be pretty glad to get a shower, shave, and haircut.
** TODO in parsers.__is_allowed() :cleanup:is_allowed:
There is a lot of madness dealing with stupid things like hyphens
vs. underscores, and lists of options vs. strings. This can *definitely* be
cleaned up.

655
docs/LICENSE
View File

@ -1,655 +0,0 @@
Copyright (c) 2013 Isis Lovecruft
Copyright (c) 2008-2012 by Vinay Sajip.
All rights reserved.
GNU AFFERO GENERAL PUBLIC LICENSE
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-*- mode: org; epa-file-encrypt-to: ("lunar@anargeek.net") -*-
#+TITLE: python-gnupg audit
#+AUTHOR: isis
#+EMAIL: isis@leap.se
#+DATE: 2013-02-01 Fri
#+DESCRIPTION:
#+KEYWORDS:
#+LANGUAGE: en
#+OPTIONS: H:3 num:t toc:t \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
#+OPTIONS: TeX:t LaTeX:t skip:nil d:nil todo:t pri:nil tags:not-in-toc
#+INFOJS_OPT: view:nil toc:2 ltoc:t mouse:underline buttons:0 path:http://orgmode.org/org-info.js
#+EXPORT_SELECT_TAGS: export
#+EXPORT_EXCLUDE_TAGS: noexport
#+LINK_UP:
#+LINK_HOME:
#+XSLT:
[2013-02-01 Fri]
* gnugp.__main__()
** comments
L58 NullHandler?? see self._write_passphrase
L61 there nifty check for p3k
** def _copy_data(instream, outstream) :cleanup:
copies data from one stream to another, 1024 bytes at a time.
*** L79: :bad_logic:
instream is apparently a file descriptor, but is not checked nor
encased in a try/except block.
*** L78: :hanging_fd:bad_logic:
while True: loop, should be
: with open(instream) as instrm:
*** L88: :bad_exception_handling:
: except:
should catch an IOError, or whatever specific error is raised for broken
pipes.
** def _threaded_copy_data(instream, outstream):
*** L99:
this just wraps self._copy_data in a thread
** def _write_passphrase(stream, passphrase, encoding): :vuln:cleanup:
*** L110: :writes_passphrase_to_disk:
logger writes passphrase into debug log. this should be patched.
* class Verify(object)
basic parsing class, no errors found
* class ImportResult(object)
basic parsing class, no errors found
* class ListKeys(list):
basic parsing class, no errors found
* class Crypt(Verify):
basic parsing class, no errors found
** def __init__(self, gpg) :cleanup:
*** L338 :mro_conflict:
#+BEGIN_SRC python
Verify.__init__(self,gpg)
#+END_SRC
should be changed to:
#+BEGIN_SRC python
super(Verify, self).__init__(gpg)
#+END_SRC
* class GenKey(object)
basic parsing class, no errors found
* class DeleteResult(object)
basic parsing class, no errors found
* class Sign(object)
basic parsing class, no errors found
* class GPG(object) :exploitable:
*** L474: :cleanup:
: cls.__doc__
should go directly underneath class signature
** def __init__(self, gpgbinary='gpg', gnupghome=None, verbose=False, use_agent=False, keyring=None) :bug:
*** L494-495: :type_error:
#+BEGIN_SRC python
if gnupghome and not os.path.isdir(self.gnupghome):
os.makedirs(self.gnupghome,0x1C0)
#+END_SRC
#+BEGIN_EXAMPLE
In [20]: os.makedirs?
Type: function
String Form:<function makedirs at 0x7f8ddeb6cc08>
File: /usr/lib/python2.7/os.py
Definition: os.makedirs(name, mode=511)
Docstring:
makedirs(path [, mode=0777])
Super-mkdir; create a leaf directory and all intermediate ones.
Works like mkdir, except that any intermediate path segment (not
just the rightmost) will be created if it does not exist. This is
recursive.
setting mode=0x1c0 is equivalent to mode=hex(0700), which
may cause bugs on some systems, see
http://ubuntuforums.org/showthread.php?t=2044879
this could be do to the complete lack of input validation in
os.makedirs, and it's calling of the os.mkdir() built-in, which
may vary depending on the python compilation:
#+END_EXAMPLE
#+BEGIN_SRC python
Source:
def makedirs(name, mode=0777):
"""makedirs(path [, mode=0777])
Super-mkdir; create a leaf directory and all intermediate ones.
Works like mkdir, except that any intermediate path segment (not
just the rightmost) will be created if it does not exist. This is
recursive.
"""
head, tail = path.split(name)
if not tail:
head, tail = path.split(head)
if head and tail and not path.exists(head):
try:
makedirs(head, mode)
except OSError, e:
# be happy if someone already created the path
if e.errno != errno.EEXIST:
raise
if tail == curdir: # xxx/newdir/. exists if xxx/newdir exists
return
mkdir(name, mode)
#+END_SRC
** def _open_subprocess(self, args, passphrase=False) :vuln:
*** L515: :unvalidated_user_input:
: cmd.extend(args)
cmd is a list of strings, eventually joined with cmd=' '.join(cmd), and
the args are unvalidated in this function. Then this concatenation of args
is fed directly into subprocess.Popen(cmd, shell=True, stdin=PIPE,
stdout=PIPE, stderr=PIPE). THIS SHOULD BE PATCHED.
** def _collect_output(self, process, result, writer=None, stdin=None)
sends stdout to self._read_data() and stderr to self._read_response()
** def _handle_io(self, args, file, result, passphrase=None, binary=False) :vuln:cleanup:
*** L601: :unvalidated_user_input:type_check_in_call:
: p = self._open_subprocess(args, passphrase is not None)
you shouldn't assign or type check in a function call
** def sign(self, message, **kwargs) :cleanup:
*** L617-619: :hanging_fd:
calls self._make_binary_stream(), which leaves the file descriptor for
the encoded message to be encrypted hanging between scopes.
** def sign_file(self, file, keyid=None, passphrase=None, clearsign=True, detach=False, binary=False) :cleanup:
*** L632-635: :bad_logic:
#+BEGIN_SRC python
if detach:
args.append("--detach-sign")
elif clearsign:
args.append("--clearsign")
#+END_SRC
the logic here allows that if a user erroneously specifies both options,
rather than doing what the system gnupg would do (that is, do --clearsign,
and ignore the --attach-sign), python-gnupg would ignore both.
*** L626-641:
input 'args' into self._open_subprocess() is defined as static strings.
** def verify(self, data): :cleanup:
*** L668-670: :hanging_fd:
same hanging file descriptor problem as in self.sign()
** def verify_file(self, file, data_filename=None) :vuln:cleanup:
*** L683: :hanging_fd:
more potentially hanging file descriptors...
*** L684: :hanging_fd:
oh look, another hanging file descriptor. imagine that.
*** L690: :unvalidated_user_input:
: args.append('"%s"' % data_filename)
well, there's the exploit. see included POC script.
** def import_keys(self, key_data) :vuln:
*** L749: :unvalidated_user_input:
this function could potentially allow an attacker with a GPG exploit to
use it, because it passes key generation parameter directly into the
internal packet parsers of GPG. however, without a GPG exploit for one of
the GPG packet parsers (for explanation of GPG packets look into pgpdump),
this function alone is not exploitable.
** def recieve_keys(self, keyserver, *keyids) :vuln:
*** L770: :unvalidated_user_input:
: args.extend(keyids)
** def export_keys(self, keyids, secret=False) :vuln:
*** L795-796: :unvalidated_user_input:
args problem again. exploitable though parameter ``keyids``.
** def list_keys(self, secret=False)
*** L827:
args is static string.
** def gen_key(self, input) :cleanup:
*** L864:
args, passed to self._handle_io(), which in turn passes args directly to
Popen(), is set to a static string. this function is halfway okay, though
it really could be more careful with the ``input`` parameter.
** def gen_key_input(self, **kwargs) :vuln:
*** L981-983: :unvalidated_user_input:
this function could potentially allow an attacker with a GPG exploit to
use it, because it passes key generation parameter directly into the
internal packet parsers of GPG. however, without a GPG exploit for one of
the GPG packet parsers (for explanation of GPG packets look into pgpdump),
this function alone is not exploitable.
** def encrypt_file(self, file, recipiencts, sign=None, ...) :vuln:
*** L939: :unvalidated_user_input:
several of the inputs to this function are unvalidated, turned into
strings, and passed to Popen(). exploitable.
** def encrypt(self, data, recipients, **kwargs): :vuln:
*** L997: :unvalidated_user_input:
exploitable, passes kwargs to self.encrypt_file()
** def decrypt(self, message **kwargs): :vuln:
*** L1003: :unvalidated_user_input:
kwargs are passed to self.decrypt_file(), unvalidated, making this
function also exploitable
** def decrypt_file(self, file, always_trust=False, passphrase=None, output=None) :vuln:
*** L1013: :unvalidated_user_input:
unvalidated user input: this function is also exploitable
* POC
#+INCLUDE: "../python-gnupg-0.3.1/python-gnupg-exploit.py" python

114
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@ -1,114 +0,0 @@
-*- mode: org -*-
* Keyring separation :keyseparation:
** TODO in GPG.gen_key() :keyseparation:gen_key:
It would be nice to have an option for gen_key() [[gnupg.py:927]] to
automatically switch before key generation to a new tempfile.mkdtemp()
directory, with a new keyring and secring, and then to rename either the
directory or the keyrings with the long keyid of the key which was freshly
generated.
* I/O :io:
** TODO in GPG.__make_args() :io:makeargs:
It would be nice to make the file descriptors for communication with the GnuPG
process configurable, and not the default, hard-coded 0=stdin 1=stdout
2=stderr.
** TODO look into RDBMS/ORM for public key storage :io:db:
see http://stackoverflow.com/q/1235594 and http://elixir.ematia.de/trac/wiki
memcached and pymemcached were the first ones I looked at, then I discovered
redis, which seemed better. At some point we should look into using elixer,
mentioned in the above SO post, so that the backend DB can be chosen freely
and we´re not restricting users to only memcached/cassandra/redis/sqlite/etc.
* Key editing :editkey:
** TODO add '--edit-key' feature :editkey:
see :compatibility:gen__key_input:
* Compatibility between GnuPG versions :compatibility:
** TODO GnuPG>=2.1.0 won't allow key generation with preset passphrase
*** TODO in GPG.gen__key_input() :compatibility:gen_key_input:
In the docstring of GPG.gen__key_input() [[gnupg.py:1068]], for the parameter
'passphrase', it is explained that:
:param str passphrase: The passphrase for the new key. The default is
to not use any passphrase. Note that
GnuPG>=2.1.x will not allow you to specify a
passphrase for batch key generation -- GnuPG
will ignore the ``passphrase`` parameter, stop,
and ask the user for the new passphrase.
However, we can put the command '%no-protection'
into the batch key generation file to allow a
passwordless key to be created, which can then
have its passphrase set later with '--edit-key'.
If we add a GnuPG version detection feature (the version string is already
obtained in GPG.___init___() [[gnupg.py:407]]), then we can automatically chain
GPG.gen__key_input() to another new feature for '--edit-key'. This chaining
would likely need to happen here [[gnupg.py:1146]].
*** TODO add '--edit-key' feature :editkey:
This would be necessary for adding a passphrase to the key after passwordless
generation in GnuPG>=2.1.0.
** TODO GnuPG==1.4.12 doesn't process "Key-Type: default" in batch files
(python-gnupg)∃!isisⒶwintermute:~/code/riseup/python-gnupg ∴ ipython
WARNING: Attempting to work in a virtualenv. If you encounter problems, please install IPython inside the virtualenv.
In [1]: import gnupg
GnuPG logging disabled...
In [2]: gpg = gnupg.GPG(homedir='./tests/doctests')
In [3]: key_input = gpg.gen_key_input()
In [4]: print key_input
Key-Type: default
Key-Length: 4096
Subkey-Type: default
Name-Email: isis@wintermute
Expire-Date: 2014-05-28
Name-Real: Autogenerated Key
%commit
In [5]: key = gpg.gen_key(key_input)
In [6]: print key.stderr
gpg: -:1: invalid algorithm
[GNUPG:] KEY_NOT_CREATED
In [7]: quit()
(python-gnupg)∃!isisⒶwintermute:~/code/riseup/python-gnupg ∴ which gpg
/usr/bin/gpg
(python-gnupg)∃!isisⒶwintermute:~/code/riseup/python-gnupg ∴ gpg --version
gpg (GnuPG) 1.4.12
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Home: ~/.gnupg
Supported algorithms:
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA
Cipher: 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH, CAMELLIA128,
CAMELLIA192, CAMELLIA256
Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
Compression: Uncompressed, ZIP, ZLIB, BZIP2
(python-gnupg)∃!isisⒶwintermute:~/code/riseup/python-gnupg ∴
* Code cleanup :cleanup:
** TODO in parsers.__sanitise() :cleanup:sanitise:
Ughh...this is the ugliest code I think I've ever written. It works, but I
worry that it is fragile, not to mention *I* have trouble reading it, and I
fucking wrote the damn thing. There's probably not much that could be done to
make it more Pythonic, because type checks and input validation are pretty much
intrinsically non-Pythonic. But did i mention that it's ugly? I'm sure these
functions would be pretty glad to get a shower, shave, and haircut.
** TODO in parsers.__is_allowed() :cleanup:is_allowed:
There is a lot of madness dealing with stupid things like hyphens
vs. underscores, and lists of options vs. strings. This can *definitely* be
cleaned up.