78 lines
3.5 KiB
Python
78 lines
3.5 KiB
Python
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#
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# regexes.py: anaconda regular expressions
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#
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# Copyright (C) 2013 Red Hat, Inc. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): David Shea <dshea@redhat.com>
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#
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import re
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# Validation expressions
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# The full name field can contain anything except a colon.
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# The empty string allowed.
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GECOS_VALID = re.compile(r'^[^:]*$')
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# Everyone has different ideas for what can go in a username. Here's ours:
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# POSIX recommends that user and group names use only the characters within
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# the portable filesystem character set (ASCII alnum plus dot, underscore,
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# and hyphen), with the additional restriction that names not start with a
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# hyphen. The Red Hat modification to shadow-utils starts with these rules
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# and additionally allows a final $, because Samba.
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#
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# shadow-utils also defines length limits for names: 32 for group names,
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# and UT_NAMESIZE for user names (which is defined as 32 bits/utmp.h). This
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# expression captures all of that: the initial character, followed by either
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# up to 30 portable characters and a dollar sign or up to 31 portable characters,
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# both for a maximum total of 32. The empty string is not allowed. "root" is not
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# allowed.
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# a base expression without anchors, helpful for building other expressions
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# If the string is the right length to match "root", use a lookback expression
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# to make sure it isn't.
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_USERNAME_BASE = r'[a-zA-Z0-9._](([a-zA-Z0-9._-]{0,2})|([a-zA-Z0-9._-]{3}(?<!root))|([a-zA-Z0-9._-]{4,31})|([a-zA-Z0-9._-]{,30}\$))'
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USERNAME_VALID = re.compile(r'^' + _USERNAME_BASE + '$')
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GROUPNAME_VALID = USERNAME_VALID
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# A comma-separated list of groups, validated as in GROUPNAME_VALID
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# Any number of spaces are allowed at the start and end of the list and
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# before and after the commas. The empty string is allowed.
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GROUPLIST_SIMPLE_VALID = re.compile(r'^\s*(' + _USERNAME_BASE + r'(\s*,\s*' + _USERNAME_BASE + r')*)?\s*$')
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# Parse the <gr-name> (<gid>) strings in the group list.
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#
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# The name match is non-greedy so that it doesn't match the whitespace betweeen
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# the name and ID.
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#
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# There's some non-capturing groups ("clusters" in the perlre parlance) thrown
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# in there, and, haha, wow, that's confusing to look at. There are two groups
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# that actually end up in the match object, and they're named to try to make
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# it a little easier: the first is "name", and the second is "gid".
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#
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# EVERY STRING IS MATCHED. This expression cannot be used for validation.
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# If there is no GID, or the GID contains non-digits, everything except
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# leading or trailing whitespace ends up in the name group. The result needs to
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# be validated with GROUPNAME_VALID.
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GROUPLIST_FANCY_PARSE = re.compile(r'^(?:\s*)(?P<name>.*?)\s*(?:\((?P<gid>\d+)\))?(?:\s*)$')
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# Proxy parsing
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PROXY_URL_PARSE = re.compile("([A-Za-z]+://)?(([A-Za-z0-9]+)(:[^:@]+)?@)?([^:/]+)(:[0-9]+)?(/.*)?")
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# IPv4 address without anchors
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IPV4_PATTERN_WITHOUT_ANCHORS = r'(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)'
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