diff options
Diffstat (limited to 'synapse/util/stringutils.py')
| -rw-r--r-- | synapse/util/stringutils.py | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/synapse/util/stringutils.py b/synapse/util/stringutils.py index f029432191..ea1032b4fc 100644 --- a/synapse/util/stringutils.py +++ b/synapse/util/stringutils.py @@ -19,6 +19,8 @@ import string from collections.abc import Iterable from typing import Optional, Tuple +from netaddr import valid_ipv6 + from synapse.api.errors import Codes, SynapseError _string_with_symbols = string.digits + string.ascii_letters + ".,;:^&*-_+=#~@" @@ -97,7 +99,10 @@ def parse_server_name(server_name: str) -> Tuple[str, Optional[int]]: raise ValueError("Invalid server name '%s'" % server_name) -VALID_HOST_REGEX = re.compile("\\A[0-9a-zA-Z.-]+\\Z") +# An approximation of the domain name syntax in RFC 1035, section 2.3.1. +# NB: "\Z" is not equivalent to "$". +# The latter will match the position before a "\n" at the end of a string. +VALID_HOST_REGEX = re.compile("\\A[0-9a-zA-Z-]+(?:\\.[0-9a-zA-Z-]+)*\\Z") def parse_and_validate_server_name(server_name: str) -> Tuple[str, Optional[int]]: @@ -122,13 +127,15 @@ def parse_and_validate_server_name(server_name: str) -> Tuple[str, Optional[int] if host[0] == "[": if host[-1] != "]": raise ValueError("Mismatched [...] in server name '%s'" % (server_name,)) - return host, port - # otherwise it should only be alphanumerics. - if not VALID_HOST_REGEX.match(host): - raise ValueError( - "Server name '%s' contains invalid characters" % (server_name,) - ) + # valid_ipv6 raises when given an empty string + ipv6_address = host[1:-1] + if not ipv6_address or not valid_ipv6(ipv6_address): + raise ValueError( + "Server name '%s' is not a valid IPv6 address" % (server_name,) + ) + elif not VALID_HOST_REGEX.match(host): + raise ValueError("Server name '%s' has an invalid format" % (server_name,)) return host, port |