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Make sanity checking of bridges a reusable component in cli.Common, so we can reuse it for automatic bridge fetching in censorship circumvention

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This commit is contained in:
Miguel Jacq 2021-11-30 10:01:14 +11:00
parent 51895d0683
commit dc717cad30
3 changed files with 41 additions and 35 deletions
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35
cli/onionshare_cli/common.py
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@ -28,6 +28,7 @@ import sys
import threading
import time
import shutil
import re
from pkg_resources import resource_filename
import colorama
@ -432,6 +433,40 @@ class Common:
r = random.SystemRandom()
return "-".join(r.choice(wordlist) for _ in range(word_count))
def check_bridges_valid(self, bridges):
"""
Does a regex check against a supplied list of bridges, to make sure they
are valid strings depending on the bridge type.
"""
valid_bridges = []
self.log("Common", "check_bridges_valid", "Checking bridge syntax")
for bridge in bridges:
if bridge != "":
# Check the syntax of the custom bridge to make sure it looks legitimate
ipv4_pattern = re.compile(
"(obfs4\s+)?(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]):([0-9]+)(\s+)([A-Z0-9]+)(.+)$"
)
ipv6_pattern = re.compile(
"(obfs4\s+)?\[(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))\]:[0-9]+\s+[A-Z0-9]+(.+)$"
)
meek_lite_pattern = re.compile(
"(meek_lite)(\s)+([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+)(\s)+([0-9A-Z]+)(\s)+url=(.+)(\s)+front=(.+)"
)
snowflake_pattern = re.compile(
"(snowflake)(\s)+([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]+)(\s)+([0-9A-Z]+)"
)
if (
ipv4_pattern.match(bridge)
or ipv6_pattern.match(bridge)
or meek_lite_pattern.match(bridge)
or snowflake_pattern.match(bridge)
):
valid_bridges.append(bridge)
if valid_bridges:
return valid_bridges
else:
return False
@staticmethod
def random_string(num_bytes, output_len=None):
"""