cups/upgrade_get_document.py.in

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@PYTHON_SHEBANG@
"""
Upgrade script to enable authentication for CUPS-Get-Document in
default policy
"""
import os
import sys
from shutil import copy
def get_cupsd_conf():
"""
Get all lines from cupsd.conf
"""
if not os.path.exists('/etc/cups/cupsd.conf'):
return None
lines = []
with open('/etc/cups/cupsd.conf', 'r') as conf:
lines = conf.readlines()
return lines
def get_default_policy(lines):
"""
Get the default policy lines
:param list lines: lines from cupsd.conf
"""
default_policy = []
in_policy = False
for line in lines:
if not in_policy and not line.lstrip().startswith('<Policy default>'):
continue
default_policy.append(line)
if line.lstrip().startswith('</Policy>'):
return default_policy
in_policy = True
return default_policy
def get_limit_with_document(lines):
"""
Get <Limit> scope which defines CUPS-Get-Document operation
:param list lines: Lines containing the default policy
"""
limit = []
in_limit = False
for line in lines:
if not in_limit and not line.lstrip().startswith('<Limit'):
continue
if (not in_limit and line.lstrip().startswith('<Limit') and
not 'CUPS-Get-Document' in line.lstrip().split('#')[0][1:-1]):
continue
limit.append(line)
if line.lstrip().startswith('</Limit>'):
return limit
in_limit = True
return limit
def check_for_authtype(lines):
"""
Check if <Limit> defining CUPS-Get-Document defines
any authentication
:param list lines: Lines of <Limit> scope which defines CUPS-Get-Document
"""
for line in lines:
if line.lstrip().startswith('AuthType'):
return True
return False
def migrate_cupsd_conf(lines):
"""
Make changes to cupsd.conf contents to use authentication
for CUPS-Get-Document
:param list lines: Lines from cupsd.conf
"""
new_lines = []
in_policy = False
create_document_limit = False
for line in lines:
if (in_policy and line.lstrip().startswith('<Limit') and
not line.lstrip().startswith('<Limit CUPS-Get-Document>') and
'CUPS-Get-Document' in line.lstrip().split('#')[0][1:-1]):
line = line.replace(' CUPS-Get-Document', '')
create_document_limit = True
if in_policy and line.lstrip().startswith('</Policy>') and create_document_limit:
new_lines.append('\n')
new_lines.append((len(line) - len(line.lstrip()) + 2) * ' ' +
'# added during upgrade\n')
new_lines.append((len(line) - len(line.lstrip()) + 2) * ' ' +
'<Limit CUPS-Get-Document>\n')
new_lines.append((len(line) - len(line.lstrip()) + 4) * ' ' +
'AuthType Default\n')
new_lines.append((len(line) - len(line.lstrip()) + 4) * ' ' +
'Require user @OWNER @SYSTEM\n')
new_lines.append((len(line) - len(line.lstrip()) + 4) * ' ' +
'Order deny,allow\n')
new_lines.append((len(line) - len(line.lstrip()) + 2) * ' ' +
'</Limit>\n')
create_document_limit = False
new_lines.append(line)
if not in_policy:
if line.lstrip().startswith('<Policy default>'):
in_policy = True
continue
if line.lstrip().startswith('<Limit CUPS-Get-Document>'):
new_lines.append((len(line) - len(line.lstrip()) + 2) * ' ' +
'# added during upgrade\n')
new_lines.append((len(line) - len(line.lstrip()) + 2) * ' ' +
'AuthType Default\n')
continue
if line.lstrip().startswith('</Policy>'):
in_policy = False
continue
return new_lines
def apply_changes(lines):
"""
Backup the original file if there is no .rpmsave already and
apply changes to the actual cupsd.conf
:param list lines: New lines for cupsd.conf
"""
if not os.path.exists('/etc/cups/cupsd.conf.rpmsave'):
copy('/etc/cups/cupsd.conf', '/etc/cups/cupsd.conf.rpmsave')
with open('/etc/cups/cupsd.conf', 'w') as conf:
conf.writelines(lines)
content = get_cupsd_conf()
if content is None:
sys.exit(1)
if check_for_authtype(get_limit_with_document(get_default_policy(content))):
sys.exit(0)
new_content = migrate_cupsd_conf(content)
apply_changes(new_content)
sys.exit(0)