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# -*- test-case-name: twisted.conch.test.test_ckeygen -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Implementation module for the `ckeygen` command.
"""
import sys, os, getpass, socket
if getpass.getpass == getpass.unix_getpass:
try:
import termios # hack around broken termios
termios.tcgetattr, termios.tcsetattr
except (ImportError, AttributeError):
sys.modules['termios'] = None
reload(getpass)
from twisted.conch.ssh import keys
from twisted.python import filepath, log, usage, randbytes
class GeneralOptions(usage.Options):
synopsis = """Usage: ckeygen [options]
"""
longdesc = "ckeygen manipulates public/private keys in various ways."
optParameters = [['bits', 'b', 1024, 'Number of bits in the key to create.'],
['filename', 'f', None, 'Filename of the key file.'],
['type', 't', None, 'Specify type of key to create.'],
['comment', 'C', None, 'Provide new comment.'],
['newpass', 'N', None, 'Provide new passphrase.'],
['pass', 'P', None, 'Provide old passphrase']]
optFlags = [['fingerprint', 'l', 'Show fingerprint of key file.'],
['changepass', 'p', 'Change passphrase of private key file.'],
['quiet', 'q', 'Quiet.'],
['showpub', 'y', 'Read private key file and print public key.']]
compData = usage.Completions(
optActions={"type": usage.CompleteList(["rsa", "dsa"])})
def run():
options = GeneralOptions()
try:
options.parseOptions(sys.argv[1:])
except usage.UsageError, u:
print 'ERROR: %s' % u
options.opt_help()
sys.exit(1)
log.discardLogs()
log.deferr = handleError # HACK
if options['type']:
if options['type'] == 'rsa':
generateRSAkey(options)
elif options['type'] == 'dsa':
generateDSAkey(options)
else:
sys.exit('Key type was %s, must be one of: rsa, dsa' % options['type'])
elif options['fingerprint']:
printFingerprint(options)
elif options['changepass']:
changePassPhrase(options)
elif options['showpub']:
displayPublicKey(options)
else:
options.opt_help()
sys.exit(1)
def handleError():
from twisted.python import failure
global exitStatus
exitStatus = 2
log.err(failure.Failure())
reactor.stop()
raise
def generateRSAkey(options):
from Crypto.PublicKey import RSA
print 'Generating public/private rsa key pair.'
key = RSA.generate(int(options['bits']), randbytes.secureRandom)
_saveKey(key, options)
def generateDSAkey(options):
from Crypto.PublicKey import DSA
print 'Generating public/private dsa key pair.'
key = DSA.generate(int(options['bits']), randbytes.secureRandom)
_saveKey(key, options)
def printFingerprint(options):
if not options['filename']:
filename = os.path.expanduser('~/.ssh/id_rsa')
options['filename'] = raw_input('Enter file in which the key is (%s): ' % filename)
if os.path.exists(options['filename']+'.pub'):
options['filename'] += '.pub'
try:
key = keys.Key.fromFile(options['filename'])
obj = key.keyObject
string = key.blob()
print '%s %s %s' % (
obj.size() + 1,
key.fingerprint(),
os.path.basename(options['filename']))
except:
sys.exit('bad key')
def changePassPhrase(options):
if not options['filename']:
filename = os.path.expanduser('~/.ssh/id_rsa')
options['filename'] = raw_input('Enter file in which the key is (%s): ' % filename)
try:
key = keys.Key.fromFile(options['filename']).keyObject
except keys.BadKeyError, e:
if e.args[0] != 'encrypted key with no passphrase':
raise
else:
if not options['pass']:
options['pass'] = getpass.getpass('Enter old passphrase: ')
key = keys.Key.fromFile(
options['filename'], passphrase = options['pass']).keyObject
if not options['newpass']:
while 1:
p1 = getpass.getpass('Enter new passphrase (empty for no passphrase): ')
p2 = getpass.getpass('Enter same passphrase again: ')
if p1 == p2:
break
print 'Passphrases do not match. Try again.'
options['newpass'] = p1
open(options['filename'], 'w').write(
keys.Key(key).toString(passphrase=options['newpass']))
print 'Your identification has been saved with the new passphrase.'
def displayPublicKey(options):
if not options['filename']:
filename = os.path.expanduser('~/.ssh/id_rsa')
options['filename'] = raw_input('Enter file in which the key is (%s): ' % filename)
try:
key = keys.Key.fromFile(options['filename']).keyObject
except keys.BadKeyError, e:
if e.args[0] != 'encrypted key with no passphrase':
raise
else:
if not options['pass']:
options['pass'] = getpass.getpass('Enter passphrase: ')
key = keys.Key.fromFile(
options['filename'], passphrase = options['pass']).keyObject
print keys.Key(key).public().toString()
def _saveKey(key, options):
if not options['filename']:
kind = keys.objectType(key)
kind = {'ssh-rsa':'rsa','ssh-dss':'dsa'}[kind]
filename = os.path.expanduser('~/.ssh/id_%s'%kind)
options['filename'] = raw_input('Enter file in which to save the key (%s): '%filename).strip() or filename
if os.path.exists(options['filename']):
print '%s already exists.' % options['filename']
yn = raw_input('Overwrite (y/n)? ')
if yn[0].lower() != 'y':
sys.exit()
if not options['pass']:
while 1:
p1 = getpass.getpass('Enter passphrase (empty for no passphrase): ')
p2 = getpass.getpass('Enter same passphrase again: ')
if p1 == p2:
break
print 'Passphrases do not match. Try again.'
options['pass'] = p1
keyObj = keys.Key(key)
comment = '%s@%s' % (getpass.getuser(), socket.gethostname())
filepath.FilePath(options['filename']).setContent(
keyObj.toString('openssh', options['pass']))
os.chmod(options['filename'], 33152)
filepath.FilePath(options['filename'] + '.pub').setContent(
keyObj.public().toString('openssh', comment))
print 'Your identification has been saved in %s' % options['filename']
print 'Your public key has been saved in %s.pub' % options['filename']
print 'The key fingerprint is:'
print keyObj.fingerprint()
if __name__ == '__main__':
run()
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