Ignore IP(v4)s by default. Add a switch to turn it off later
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@ -3,6 +3,8 @@ import enum
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import entry
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import hashing
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# TODO: Include a thing for checking what hosts match a given fingerprint
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def check_fingerprint(entries, domain, port, fingerprint):
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"""check_fingerprint([Entry], str, u16, bytes[32]) → ([str]: successes, [str]: fails)
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Checks if the given host is found with the given fingerprint.
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@ -6,6 +6,7 @@ import write_file
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def main():
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# TODO: Don't hardcode
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# TODO: Handle errors
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# TODO: Add a switch for whether you want to include IPs
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with open(sys.argv[1], 'r') as f:
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try:
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entries = process_known_hosts.process_file(f)
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@ -25,11 +25,38 @@ class HashedHostError(Exception):
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else:
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return 'Line %i: %s' % (self.line, self.string)
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def process_line(line):
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def is_ip(domain):
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"""is_ip(str) → bool
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Sees if a given domain would be a valid v4 or v6 IP"""
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def is_ipv4(domain):
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# IPv4 address has 4 fields separated by .
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fields = domain.split('.')
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if len(fields) != 4: return False
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# The fields are base-10 integers
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fields_num = []
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for field in fields:
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try:
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fields_num.append(int(field, 10))
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except ValueError:
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return False
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# The fields are in the range 0…255
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return all(0 <= field <= 266 for field in fields_num)
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def is_ipv6(domain):
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# TODO: Implement this
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return False # FIXME: This is wrong
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return is_ipv4(domain) or is_ipv6(domain)
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def process_line(line, ignore_ips):
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# TODO: Add a way to skip IPs
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"""process_line(str) → [Entry]
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"""process_line(str, bool) → [Entry]
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Given a string containing one line of .ssh/known_hosts file, create
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a list of Entries based on it."""
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a list of Entries based on it.
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If ignore_ips is True, only create entries for domain names."""
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assert type(line) == str
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# Remove trailing newlines
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@ -89,21 +116,28 @@ def process_line(line):
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domain = host
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port = 22
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# As we have now extracted the domain, we can check if we
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# need to throw it out
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if ignore_ips and is_ip(domain):
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continue
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# Default to no comment
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entries.append(entry.create_entry(domain, port, fingerprint, ''))
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return entries
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def process_file(f):
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"""process_file(file(r)) → [Entry]
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def process_file(f, ignore_ips = True):
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"""process_file(file(r), bool) → [Entry]
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Given a file in the .ssh/known_hosts format, create a list of
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entries"""
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entries.
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If ignore_ips is True, only create entries for domain names."""
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entries = []
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# Line numbers are 1-indexed but enumerate 0-indexes
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for linenum_minus_one, line in enumerate(f):
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try:
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entries.extend(process_line(line))
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entries.extend(process_line(line, ignore_ips))
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except (KnownHostsSyntaxError, HashedHostError) as err:
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err.line = linenum_minus_one + 1
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raise err
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