models.py 3.6 KB
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# Copyright (c) 2014, Clemson University
# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the following disclaimer in the documentation
#   and/or other materials provided with the distribution.
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#
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# * Neither the name of the {organization} nor the names of its
#   contributors may be used to endorse or promote products derived from
#   this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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from django.db import models
from django.contrib.auth.models import User
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from django.core.exceptions import ValidationError
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from django_sshkey.util import sshkey_re, sshkey_fingerprint
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class UserKey(models.Model):
  user = models.ForeignKey(User, db_index=True)
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  name = models.CharField(max_length=50, blank=True)
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  key = models.TextField(max_length=2000)
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  fingerprint = models.CharField(max_length=47, blank=True, db_index=True)
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  created = models.DateTimeField(auto_now_add=True, null=True)
  last_modified = models.DateTimeField(auto_now=True, null=True)
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  class Meta:
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    db_table = 'sshkey_userkey'
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    unique_together = [
      ('user', 'name'),
    ]

  def __unicode__(self):
    return unicode(self.user) + u': ' + self.name

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  def clean_fields(self, exclude=None):
    if not exclude or 'key' not in exclude:
      self.key = self.key.strip()

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  def clean(self):
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    m = sshkey_re.match(self.key)
    errmsg = 'Key is not a valid SSH protocol 2 base64-encoded key'
    if not m:
      raise ValidationError(errmsg)
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    try:
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      self.fingerprint = sshkey_fingerprint(m.group('b64key'))
    except TypeError:
      raise ValidationError(errmsg)
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    if not self.name:
      comment = m.group('comment')
      if not comment:
        raise ValidationError('Name or key comment required')
      self.name = comment
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  def validate_unique(self, exclude=None):
    if self.pk is None:
      objects = type(self).objects
    else:
      objects = type(self).objects.exclude(pk=self.pk)
    if exclude is None or 'name' not in exclude:
      if objects.filter(user=self.user, name=self.name).count():
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        message = 'You already have a key with that name'
        raise ValidationError({'name': [message]})
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    if exclude is None or 'key' not in exclude:
      try:
        other = objects.get(fingerprint=self.fingerprint, key=self.key)
        if self.user == other.user:
          message = 'You already have that key on file (%s)' % other.name
        else:
          message = 'Somebody else already has that key on file'
        raise ValidationError({'key': [message]})
      except type(self).DoesNotExist:
        pass