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#!/usr/bin/python3
import gettext
import gi
import gnupg
import locale
import os
import requests
import subprocess
import sys
import threading
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, GLib
APP = 'mintstick'
LOCALE_DIR = "/usr/share/locale"
locale.bindtextdomain(APP, LOCALE_DIR)
gettext.bindtextdomain(APP, LOCALE_DIR)
gettext.textdomain(APP)
_ = gettext.gettext
TRUSTED_SIGNATURES = {"27DEB15644C6B3CF3BD7D291300F846BA25BAE09": "Linux Mint",
"C5986B4F1257FFA86632CBA746181433FBB75451": "Ubuntu",
"843938DF228D22F7B3742BC0D94AA3F0EFE21092": "Ubuntu",
"10460DAD76165AD81FBC0CE9988021A964E6EA7D": "Debian",
"DF9B9C49EAA9298432589D76DA87E80D6294BE9B": "Debian",
"F41D30342F3546695F65C66942468F4009EA8AC3": "Debian"}
MINT_MIRROR = "https://mirrors.kernel.org/linuxmint"
CACHE_DIR = os.path.expanduser("~/.cache/mintstick")
subprocess.call(["mkdir", "-p", CACHE_DIR])
PATH_SUMS = os.path.join(CACHE_DIR, "sha256sum.txt")
PATH_GPG = os.path.join(CACHE_DIR, "sha256sum.txt.gpg")
# Used as a decorator to run things in the background
def async_function(func):
def wrapper(*args, **kwargs):
thread = threading.Thread(target=func, args=args, kwargs=kwargs)
thread.daemon = True
thread.start()
return thread
return wrapper
# Used as a decorator to run things in the main loop, from another thread
def idle_function(func):
def wrapper(*args):
GLib.idle_add(func, *args)
return wrapper
# Converts bytes to readable size
def convert_bytes(num):
for x in [_('bytes'), _('KB'), _('MB'), _('GB'), _('TB')]:
if num < 1024.0:
return "%3.1f %s" % (num, x)
num /= 1024.0
class App():
def __init__(self, iso_path_arg=None):
self.gpg = gnupg.GPG()
self.sha256sum = None # the sum of the ISO
self.path = None # path of the ISO
self.filename = None # filename of the ISO
self.builder = Gtk.Builder()
self.builder.set_translation_domain(APP)
self.builder.add_from_file("/usr/share/mintstick/verify.ui")
self.window = self.builder.get_object("main_window")
self.window.connect("destroy", self.quit)
self.window.set_position(Gtk.WindowPosition.CENTER)
self.window.show()
self.filechooser = self.builder.get_object("filechooser")
if iso_path_arg is not None and os.path.isfile(iso_path_arg):
self.filechooser.set_filename(iso_path_arg)
self.file_selected()
self.filechooser.connect("file-set", self.file_selected)
self.builder.get_object("verify_url_button").connect("clicked", self.verify_url)
self.builder.get_object("verify_files_button").connect("clicked", self.verify_files)
self.builder.get_object("verify_checksum_button").connect("clicked", self.verify_checksum)
self.builder.get_object("back_button").connect("clicked", self.go_back)
self.builder.get_object("stack_checksum").connect("notify::visible-child-name", self.update_verify_button)
self.builder.get_object("entry_sum").connect("changed", self.update_verify_button)
# filechoosers
file_filter = Gtk.FileFilter()
file_filter.set_name(_("ISO images"))
file_filter.add_mime_type("application/x-cd-image")
self.filechooser.add_filter(file_filter)
file_filter = Gtk.FileFilter()
file_filter.set_name(_("Checksum files"))
file_filter.add_mime_type("text/plain")
self.builder.get_object("filechooser_sums").add_filter(file_filter)
file_filter = Gtk.FileFilter()
file_filter.set_name(_("GPG signatures"))
file_filter.add_mime_type("application/pgp-encrypted")
file_filter.add_mime_type("application/pgp-signature")
file_filter.add_mime_type("application/pgp-keys")
self.builder.get_object("filechooser_gpg").add_filter(file_filter)
self.builder.get_object("filechooser_sums").connect("file-set", self.update_verify_button)
self.builder.get_object("filechooser_gpg").connect("file-set", self.update_verify_button)
def file_selected(self, widget=None):
self.path = None
self.filename = None
self.sha256sum = None
path = self.filechooser.get_filename()
self.builder.get_object("size_label").set_text(_("Calculating..."))
self.builder.get_object("volume_label").set_text(_("Calculating..."))
self.builder.get_object("checksum_label").set_text(_("Calculating..."))
self.builder.get_object("headerbar").set_subtitle(path)
self.builder.get_object("verify_url_button").set_sensitive(False)
self.builder.get_object("verify_files_button").set_sensitive(False)
self.builder.get_object("verify_checksum_button").set_sensitive(False)
if path is not None and os.path.isfile(path):
self.builder.get_object("result_stack").set_visible_child_name("page_verification")
self.builder.get_object("stack_checksum").set_visible_child_name("page_url")
self.path = path
self.filename = os.path.basename(path)
self.guess_urls()
self.calculate_size()
self.calculate_volume()
self.calculate_checksum()
def guess_urls(self):
# guess the SUMS/GPG URL based on the ISO name
try:
sums = ""
gpg = ""
if self.filename.startswith("linuxmint-"):
if self.filename.endswith("-beta.iso"):
sums = f"{MINT_MIRROR}/testing/sha256sum.txt"
elif self.filename.endswith(".iso"):
# extract version number
version = self.filename.split("-")[1]
sums = f"{MINT_MIRROR}/stable/{version}/sha256sum.txt"
gpg = sums + ".gpg"
elif self.filename.startswith("lmde-"):
if self.filename.endswith("-beta.iso"):
sums = f"{MINT_MIRROR}/testing/sha256sum.txt"
elif self.filename.endswith(".iso"):
# extract version number
sums = f"{MINT_MIRROR}/debian/sha256sum.txt"
gpg = sums + ".gpg"
elif self.filename.startswith("ubuntu-"):
version = self.filename.split("-")[1]
# remove point version from version
major = version.split(".")[0]
minor = version.split(".")[1]
version = f"{major}.{minor}"
sums = f"http://releases.ubuntu.com/{version}/SHA256SUMS"
gpg = sums + ".gpg"
self.builder.get_object("entry_url_sums").set_text(sums)
self.builder.get_object("entry_url_gpg").set_text(gpg)
except Exception as e:
# best effort
print(e)
pass
@async_function
def calculate_size(self):
file_info = os.stat(self.path)
text = convert_bytes(file_info.st_size)
self.set_label("size_label", text)
@async_function
def calculate_volume(self):
volume_id = _("No volume ID found")
try:
stdout = subprocess.check_output(["isoinfo", "-d", "-i", self.path], text=True)
for line in stdout.split("\n"):
if "volume id:" in line.lower():
volume_id = line.split(":")[1].strip()
except Exception as e:
print("Can't get volume id: %s" % str(e))
self.set_label("volume_label", volume_id)
@async_function
def calculate_checksum(self):
print("Checking ", self.path)
try:
checksum = subprocess.check_output(["sha256sum", "-b", self.path], text=True)
checksum = checksum.replace(self.path, "").replace("*", "").strip()
except Exception as e:
checksum = str(e)
self.set_label("checksum_label", checksum)
self.sha256sum = checksum
def update_verify_button(self, *args):
self.builder.get_object("verify_url_button").set_sensitive(False)
self.builder.get_object("verify_files_button").set_sensitive(False)
self.builder.get_object("verify_checksum_button").set_sensitive(False)
if self.sha256sum is None:
return
if self.builder.get_object("entry_url_sums").get_text() != "" and self.builder.get_object("entry_url_gpg").get_text() != "":
self.builder.get_object("verify_url_button").set_sensitive(True)
if self.builder.get_object("filechooser_sums").get_filename() is not None and self.builder.get_object("filechooser_gpg").get_filename() is not None:
self.builder.get_object("verify_files_button").set_sensitive(True)
if (self.builder.get_object("entry_sum").get_text() != ""):
self.builder.get_object("verify_checksum_button").set_sensitive(True)
@idle_function
def set_label(self, label, text):
self.builder.get_object(label).set_text(text)
self.update_verify_button()
def verify_checksum(self, button):
if self.builder.get_object("entry_sum").get_text().lower() == self.sha256sum.lower():
self.show_result("dialog-warning", _("The checksum is correct"),
summary=_("The checksum is correct but the authenticity of the sum was not verified."))
else:
self.show_result("dialog-error", _("Checksum mismatch"),
summary=_("Download the ISO image again. Its checksum does not match."))
def verify_url(self, button):
# Download files
try:
with open(PATH_SUMS, "wb") as file:
url = self.builder.get_object("entry_url_sums").get_text()
response = requests.get(url)
response.raise_for_status()
file.write(response.content)
except:
self.dialog(_("The sums file could not be downloaded. Check the URL."))
return
try:
with open(PATH_GPG, "wb") as file:
url = self.builder.get_object("entry_url_gpg").get_text()
response = requests.get(url)
response.raise_for_status()
file.write(response.content)
except:
self.dialog(_("The gpg file could not be downloaded. Check the URL."))
return
self.verify()
def verify_files(self, button):
# Copy files
try:
with open(PATH_SUMS, "wb") as file:
path = self.builder.get_object("filechooser_sums").get_filename()
subprocess.call(["cp", path, PATH_SUMS])
except:
self.dialog(_("The sums file could not be checked."))
return
try:
with open(PATH_GPG, "wb") as file:
path = self.builder.get_object("filechooser_gpg").get_filename()
subprocess.call(["cp", path, PATH_GPG])
except:
self.dialog(_("The gpg file could not be checked."))
return
self.verify()
def verify(self):
details = []
try:
integrity_ok, explanation = self.check_integrity()
if not integrity_ok:
# Incorrect SUM
self.show_result("dialog-error", _("Integrity check failed"),
summary=explanation)
return
# note: verify_file automatically closes the file handle
verified = self.gpg.verify_file(open(PATH_GPG, "rb"), PATH_SUMS)
if verified.fingerprint is None:
# The GPG file is not signed
self.show_result("dialog-error", _("The SHA256 sums file is not signed."))
return
fingerprint = verified.fingerprint
details.append(_("Signed by: %s") % fingerprint)
for keyserver in ['hkp://keyserver.ubuntu.com', 'hkp://keys.openpgp.org']:
if not verified.valid:
# The key isn't in the keyring, download it from the keyserver
# Note: keyserver.ubuntu.com is fast but unreliable, start with that one
# keys.opengpg.org is reliable but slower, it's a good fallback
print(f"Importing {fingerprint} from {keyserver}")
# re-verify
self.gpg.recv_keys(keyserver, fingerprint)
verified = self.gpg.verify_file(open(PATH_GPG, "rb"), PATH_SUMS)
# Remove it from the keyring
print("Deleting", fingerprint)
self.gpg.delete_keys(fingerprint)
if not verified.valid:
# The key still isn't in the keyring
self.show_result("dialog-warning", _("Unknown signature"),
summary=_("Key not found on keyserver."),
details=details)
return
if verified.username is not None:
details.append(verified.username)
if verified.fingerprint in TRUSTED_SIGNATURES.keys():
name = TRUSTED_SIGNATURES[verified.fingerprint]
logo_name = name.replace(" ", "").lower().strip()
logo_name = f"mintstick-logo-{logo_name}"
self.show_result(logo_name, _("Everything looks good!"),
summary=_("This is an official ISO image."),
details=details)
return
if verified.trust_level is not None and verified.trust_level >= verified.TRUST_FULLY:
self.show_result("application-certificate", _("Everything looks good!"),
summary=_("This ISO image is verified by a trusted signature."),
details=details)
else:
details.append(_("If you trust the signature you can trust the ISO."))
self.show_result("dialog-warning", _("Untrusted signature"),
summary=_("This ISO image is verified by an untrusted signature."),
details=details)
return
except Exception as e:
self.show_result("dialog-error", _("An error occurred"), details=[str(e)])
def check_integrity(self):
with open(PATH_SUMS) as sums_file:
for line in sums_file:
line = line.strip()
if line.endswith(f" *{self.filename}") or line.endswith(f" {self.filename}"):
if line == f"{self.sha256sum} *{self.filename}" or \
line == f"{self.sha256sum} {self.filename}":
return (True, None)
else:
return (False, _("The SHA256 sum of the ISO image is incorrect."))
return (False, _("The SHA256 sums file does not contain sums for this ISO image."))
def show_result(self, icon_name, text, summary=None, details=None):
self.builder.get_object("image_result").set_from_icon_name(icon_name, 64)
self.builder.get_object("label_result").set_text(text)
if summary is not None:
self.builder.get_object("label_result_summary").set_text(summary)
if details is not None:
self.builder.get_object("label_result_details").set_text("\n".join(details))
self.builder.get_object("result_stack").set_visible_child_name("page_result")
# Unselect the summary label
self.builder.get_object("label_result_summary").select_region(0, 0)
self.builder.get_object("back_button").grab_focus()
def dialog(self, text):
dialog = Gtk.MessageDialog(parent=self.window,
modal=True,
message_type=Gtk.MessageType.WARNING,
buttons=Gtk.ButtonsType.OK,
text=text)
dialog.set_default_response(Gtk.ResponseType.OK)
dialog.run()
dialog.destroy()
def go_back(self, button):
self.builder.get_object("result_stack").set_visible_child_name("page_verification")
def quit(self, widget=None):
Gtk.main_quit()
if len(sys.argv) != 2:
print("Usage:\n mint-iso-verify iso_file\n\nExiting.")
sys.exit(1)
filename = sys.argv[1]
if not os.path.exists(filename):
print(f"File not found '{filename}'.\nExiting.")
sys.exit(1)
App(sys.argv[1])
Gtk.main()
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