forked from nmcspadden/ProfileSigner
/
profile_signer.py
executable file
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/
profile_signer.py
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#!/usr/bin/python
import argparse
import subprocess
import os
import sys
import tempfile
from Foundation import NSPropertyListSerialization, NSData, NSPropertyListXMLFormat_v1_0, NSPropertyListMutableContainers
#Copied from FoundationPlist
class FoundationPlistException(Exception):
"""Basic exception for plist errors"""
pass
class NSPropertyListSerializationException(FoundationPlistException):
"""Read/parse error for plists"""
pass
class NSPropertyListWriteException(FoundationPlistException):
"""Write error for plists"""
pass
def readPlist(filepath):
"""
Read a .plist file from filepath. Return the unpacked root object
(which is usually a dictionary).
"""
plistData = NSData.dataWithContentsOfFile_(filepath)
dataObject, dummy_plistFormat, error = (
NSPropertyListSerialization.
propertyListFromData_mutabilityOption_format_errorDescription_(
plistData, NSPropertyListMutableContainers, None, None))
if dataObject is None:
if error:
error = error.encode('ascii', 'ignore')
else:
error = "Unknown error"
errmsg = "%s in file %s" % (error, filepath)
raise NSPropertyListSerializationException(errmsg)
else:
return dataObject
def readPlistFromString(data):
'''Read a plist data from a string. Return the root object.'''
try:
plistData = buffer(data)
except TypeError, err:
raise NSPropertyListSerializationException(err)
dataObject, dummy_plistFormat, error = (
NSPropertyListSerialization.
propertyListFromData_mutabilityOption_format_errorDescription_(
plistData, NSPropertyListMutableContainers, None, None))
if dataObject is None:
if error:
error = error.encode('ascii', 'ignore')
else:
error = "Unknown error"
raise NSPropertyListSerializationException(error)
else:
return dataObject
def writePlist(dataObject, filepath):
'''
Write 'rootObject' as a plist to filepath.
'''
plistData, error = (
NSPropertyListSerialization.
dataFromPropertyList_format_errorDescription_(
dataObject, NSPropertyListXMLFormat_v1_0, None))
if plistData is None:
if error:
error = error.encode('ascii', 'ignore')
else:
error = "Unknown error"
raise NSPropertyListSerializationException(error)
else:
if plistData.writeToFile_atomically_(filepath, True):
return
else:
raise NSPropertyListWriteException(
"Failed to write plist data to %s" % filepath)
def writePlistToString(rootObject):
'''Return 'rootObject' as a plist-formatted string.'''
plistData, error = (
NSPropertyListSerialization.
dataFromPropertyList_format_errorDescription_(
rootObject, NSPropertyListXMLFormat_v1_0, None))
if plistData is None:
if error:
error = error.encode('ascii', 'ignore')
else:
error = "Unknown error"
raise NSPropertyListSerializationException(error)
else:
return str(plistData)
def main():
parser = argparse.ArgumentParser(description='Sign or encrypt mobileconfig profiles, using either a cert + key file, or a keychain certificate.')
parser.add_argument('sign', choices=('sign', 'encrypt', 'both'), help='Choose to sign, encrypt, or do both on a profile.')
key_group = parser.add_argument_group('Keychain arguments', description='Use these if you wish to sign with a Keychain certificate.')
key_group.add_argument('-k', '--keychain', help='Name of keychain to search for cert. Defaults to login.keychain',
default='login.keychain')
key_group.add_argument('-n', '--name', help='Common name of certificate to use from keychain.', required=True)
parser.add_argument('infile', help='Path to input .mobileconfig file')
parser.add_argument('outfile', help='Path to output .mobileconfig file. Defaults to outputting into the same directory.')
args = parser.parse_args()
if args.sign == 'encrypt' or args.sign == 'both':
if args.sign == 'both':
outputFile = args.outfile + '_unsigned'
else:
outputFile = args.outfile
# encrypt the profile only, do not sign
# Encrypting a profile:
# 1. Extract payload content into its own file
# 2. Serial that file as its own plist
# 3. CMS-envelope that content (using openssl for now)
# 4. Remove "PayloadContent" key and replace with "EncryptedPayloadContent" key
# 5. Replace the PayloadContent <array> with <data> tags instead
# Step 1: Extract payload content into its own file
myProfile = readPlist(args.infile)
payloadContent = myProfile['PayloadContent']
# Step 2: Serialize that file into its own plist
(pContentFile, pContentPath) = tempfile.mkstemp()
#print "pContentPath: %s" % pContentPath
writePlist(payloadContent, pContentPath)
# Step 3: Use openssl to encrypt that content
# First, we need to extract the certificate we want to use from the keychain
security_cmd = ['/usr/bin/security', 'find-certificate', '-c', args.name, '-p' ]
if args.keychain:
security_cmd += [args.keychain]
proc = subprocess.Popen(security_cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(sout, serr) = proc.communicate()
if serr:
print >> sys.stderr, "Error: %s" % serr
sys.exit(1)
# Now write the certificate to a temp file
(certfile, certpath) = tempfile.mkstemp('.der')
#print "Certpath: %s" % certpath
try:
with open(certpath, 'wb') as f:
f.write(sout)
except IOError:
print >> sys.stderr, "Could not write to file!"
sys.exit(1)
# Now use openssl to encrypt the payload content using that certificate
(encPContentfile, encPContentPath) = tempfile.mkstemp('.plist')
#print "encPContentPath: %s" % encPContentPath
enc_cmd = ['/usr/bin/openssl', 'smime', '-encrypt', '-aes256', '-outform', 'der',
'-in', pContentPath, '-out', encPContentPath]
enc_cmd += [certpath]
proc = subprocess.Popen(enc_cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(encout, encerr) = proc.communicate()
if encerr:
print >> sys.stderr, "Error: %s" % encerr
sys.exit(1)
# openssl smime -encrypt produces no output if successful
# Step 4: Add the new encrypted payload content back into the plist
with open(encPContentPath, 'rb') as f:
binaryEncPayload = f.read()
del myProfile['PayloadContent']
wrapped_data = NSData.dataWithBytes_length_(binaryEncPayload, len(binaryEncPayload))
myProfile['EncryptedPayloadContent'] = wrapped_data
# Step 5: Replace the plist with the new content
plistData, error = NSPropertyListSerialization.dataFromPropertyList_format_errorDescription_(myProfile, NSPropertyListXMLFormat_v1_0, None)
plistData.writeToFile_atomically_(outputFile, True)
# Now clean up after ourselves
os.remove(pContentPath)
os.remove(certpath)
os.remove(encPContentPath)
if args.sign == 'sign' or args.sign == 'both':
# Keychain check:
if not args.name:
print >> sys.stderr, 'Error: A certificate common name is required to sign profiles with the Keychain.'
sys.exit(22)
if args.sign == 'both':
# If we already encrypted it, then the correct file is already in outputFile
inputFile = outputFile
else:
inputFile = args.infile
cmd = ['/usr/bin/security', 'cms', '-S', '-N', args.name, '-i', inputFile, '-o', args.outfile ]
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(sout, serr) = proc.communicate()
if serr:
print >> sys.stderr, 'Error: %s' % serr
sys.exit(1)
if args.sign == 'both':
os.remove(outputFile)
if __name__ == '__main__':
main()