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Validating ssh public keys using sshpubkeys

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M.Ravi 2017-09-07 00:31:09 +02:00
parent dc6fa5428e
commit cf6bd8a7c1
3 changed files with 21 additions and 15 deletions
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27
hosting/forms.py
View file

@ -6,6 +6,8 @@ import struct
from django import forms from django import forms
from django.contrib.auth import authenticate from django.contrib.auth import authenticate
from django.utils.translation import ugettext_lazy as _ from django.utils.translation import ugettext_lazy as _
from sshpubkeys import SSHKey
from sshpubkeys.exceptions import InvalidKeyException
from membership.models import CustomUser from membership.models import CustomUser
from .models import UserHostingKey from .models import UserHostingKey
@ -89,28 +91,25 @@ class UserHostingKeyForm(forms.ModelForm):
def clean_public_key(self): def clean_public_key(self):
""" """
A simple validation of ssh public key A function that validates a public ssh key using sshpubkeys module
See https://www.ietf.org/rfc/rfc4716.txt
:return: :return:
""" """
if 'generate' in self.request.POST: if 'generate' in self.request.POST:
return self.data.get('public_key') return self.data.get('public_key')
KEY_ERROR_MESSAGE = _("Please input a proper SSH key") KEY_ERROR_MESSAGE = _("Please input a proper SSH key")
openssh_pubkey = self.data.get('public_key') openssh_pubkey_str = self.data.get('public_key')
data = None ssh_key = SSHKey(openssh_pubkey_str)
try: try:
key_type, key_string, comment = openssh_pubkey.split() ssh_key.parse()
data = base64.decodebytes(key_string.encode('utf-8')) except InvalidKeyException as err:
except Exception as e: logger.error(
logger.error("Exception while decoding ssh key {}".format(e)) "InvalidKeyException while parsing ssh key {0}".format(err))
raise forms.ValidationError(KEY_ERROR_MESSAGE) raise forms.ValidationError(KEY_ERROR_MESSAGE)
int_len = 4 except NotImplementedError as err:
str_len = struct.unpack('>I', data[:int_len])[0] logger.error(
if str_len != 7: "NotImplementedError while parsing ssh key {0}".format(err))
raise forms.ValidationError(KEY_ERROR_MESSAGE) raise forms.ValidationError(KEY_ERROR_MESSAGE)
if data[int_len:int_len + str_len] != key_type.encode('utf-8'): return openssh_pubkey_str
raise forms.ValidationError(KEY_ERROR_MESSAGE)
return openssh_pubkey
def clean_name(self): def clean_name(self):
return self.data.get('name') return self.data.get('name')

8
hosting/locale/de/LC_MESSAGES/django.po
View file

@ -8,7 +8,7 @@ msgid ""
msgstr "" msgstr ""
"Project-Id-Version: PACKAGE VERSION\n" "Project-Id-Version: PACKAGE VERSION\n"
"Report-Msgid-Bugs-To: \n" "Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2017-09-02 03:08+0530\n" "POT-Creation-Date: 2017-09-06 22:27+0000\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n" "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n" "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: LANGUAGE <LL@li.org>\n" "Language-Team: LANGUAGE <LL@li.org>\n"
@ -24,6 +24,9 @@ msgstr "Dein Benutzername und/oder Dein Passwort ist falsch."
msgid "Your account is not activated yet." msgid "Your account is not activated yet."
msgstr "Dein Account wurde noch nicht aktiviert." msgstr "Dein Account wurde noch nicht aktiviert."
msgid "User does not exist"
msgstr ""
msgid "Paste here your public key" msgid "Paste here your public key"
msgstr "Füge deinen Public Key ein" msgstr "Füge deinen Public Key ein"
@ -33,6 +36,9 @@ msgstr "Gebe deinem SSH-Key einen Name"
msgid "Key name" msgid "Key name"
msgstr "Key-Name" msgstr "Key-Name"
msgid "Please input a proper SSH key"
msgstr ""
msgid "My Virtual Machines" msgid "My Virtual Machines"
msgstr "Meine virtuellen Maschinen" msgstr "Meine virtuellen Maschinen"

1
requirements.txt
View file

@ -97,3 +97,4 @@ billiard==3.5.0.3
amqp==2.2.1 amqp==2.2.1
vine==1.1.4 vine==1.1.4
git+https://github.com/ungleich/cdist.git#egg=cdist git+https://github.com/ungleich/cdist.git#egg=cdist
sshpubkeys