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failregex.py
# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: t -*- # vi: set ft=python sts=4 ts=4 sw=4 noet : # This file is part of Fail2Ban. # # Fail2Ban is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # Fail2Ban is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with Fail2Ban; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. __author__ = "Cyril Jaquier" __copyright__ = "Copyright (c) 2004 Cyril Jaquier" __license__ = "GPL" import re import sre_constants import sys from .ipdns import IPAddr FTAG_CRE = re.compile(r'</?[\w\-]+/?>') FCUSTNAME_CRE = re.compile(r'^(/?)F-([A-Z0-9_\-]+)$'); # currently uppercase only R_HOST = [ # separated ipv4: r"""(?:::f{4,6}:)?(?P<ip4>%s)""" % (IPAddr.IP_4_RE,), # separated ipv6: r"""(?P<ip6>%s)""" % (IPAddr.IP_6_RE,), # separated dns: r"""(?P<dns>[\w\-.^_]*\w)""", # place-holder for ADDR tag-replacement (joined): "", # place-holder for HOST tag replacement (joined): "", # CIDR in simplest integer form: r"(?P<cidr>\d+)", # place-holder for SUBNET tag-replacement "", ] RI_IPV4 = 0 RI_IPV6 = 1 RI_DNS = 2 RI_ADDR = 3 RI_HOST = 4 RI_CIDR = 5 RI_SUBNET = 6 R_HOST[RI_ADDR] = r"\[?(?:%s|%s)\]?" % (R_HOST[RI_IPV4], R_HOST[RI_IPV6],) R_HOST[RI_HOST] = r"(?:%s|%s)" % (R_HOST[RI_ADDR], R_HOST[RI_DNS],) R_HOST[RI_SUBNET] = r"\[?(?:%s|%s)(?:/%s)?\]?" % (R_HOST[RI_IPV4], R_HOST[RI_IPV6], R_HOST[RI_CIDR],) RH4TAG = { # separated ipv4 (self closed, closed): "IP4": R_HOST[RI_IPV4], "F-IP4/": R_HOST[RI_IPV4], # separated ipv6 (self closed, closed): "IP6": R_HOST[RI_IPV6], "F-IP6/": R_HOST[RI_IPV6], # 2 address groups instead of <ADDR> - in opposition to `<HOST>`, # for separate usage of 2 address groups only (regardless of `usedns`), `ip4` and `ip6` together "ADDR": R_HOST[RI_ADDR], "F-ADDR/": R_HOST[RI_ADDR], # subnet tags for usage as `<ADDR>/<CIDR>` or `<SUBNET>`: "CIDR": R_HOST[RI_CIDR], "F-CIDR/": R_HOST[RI_CIDR], "SUBNET": R_HOST[RI_SUBNET], "F-SUBNET/":R_HOST[RI_SUBNET], # separated dns (self closed, closed): "DNS": R_HOST[RI_DNS], "F-DNS/": R_HOST[RI_DNS], # default failure-id as no space tag: "F-ID/": r"""(?P<fid>\S+)""", # default failure port, like 80 or http : "F-PORT/": r"""(?P<fport>\w+)""", } # default failure groups map for customizable expressions (with different group-id): R_MAP = { "id": "fid", "port": "fport", } # map global flags like ((?i)xxx) or (?:(?i)xxx) to local flags (?i:xxx) if supported by RE-engine in this python version: try: re.search("^re(?i:val)$", "reVAL") R_GLOB2LOCFLAGS = ( re.compile(r"(?<!\\)\((?:\?:)?(\(\?[a-z]+)\)"), r"\1:" ) except: R_GLOB2LOCFLAGS = () def mapTag2Opt(tag): tag = tag.lower() return R_MAP.get(tag, tag) # complex names: # ALT_ - alternate names to be merged, e. g. alt_user_1 -> user ... ALTNAME_PRE = 'alt_' # TUPLE_ - names of parts to be combined to single value as tuple TUPNAME_PRE = 'tuple_' COMPLNAME_PRE = (ALTNAME_PRE, TUPNAME_PRE) COMPLNAME_CRE = re.compile(r'^(' + '|'.join(COMPLNAME_PRE) + r')(.*?)(?:_\d+)?$') ## # Regular expression class. # # This class represents a regular expression with its compiled version. class Regex: ## # Constructor. # # Creates a new object. This method can throw RegexException in order to # avoid construction of invalid object. # @param value the regular expression def __init__(self, regex, multiline=False, **kwargs): self._matchCache = None # Perform shortcuts expansions. # Replace standard f2b-tags (like "<HOST>", etc) using default regular expressions: regex = Regex._resolveHostTag(regex, **kwargs) # if regex.lstrip() == '': raise RegexException("Cannot add empty regex") # special handling wrapping global flags to local flags: if R_GLOB2LOCFLAGS: regex = R_GLOB2LOCFLAGS[0].sub(R_GLOB2LOCFLAGS[1], regex) try: self._regexObj = re.compile(regex, re.MULTILINE if multiline else 0) self._regex = regex self._altValues = [] self._tupleValues = [] for k in [k for k in self._regexObj.groupindex if len(k) > len(COMPLNAME_PRE[0])]: n = COMPLNAME_CRE.match(k) if n: g, n = n.group(1), mapTag2Opt(n.group(2)) if g == ALTNAME_PRE: self._altValues.append((k,n)) else: self._tupleValues.append((k,n)) self._altValues.sort() self._tupleValues.sort() self._altValues = self._altValues if len(self._altValues) else None self._tupleValues = self._tupleValues if len(self._tupleValues) else None except sre_constants.error as e: raise RegexException("Unable to compile regular expression '%s':\n%s" % (regex, e)) # set fetch handler depending on presence of alternate (or tuple) tags: self.getGroups = self._getGroupsWithAlt if (self._altValues or self._tupleValues) else self._getGroups def __str__(self): return "%s(%r)" % (self.__class__.__name__, self._regex) ## # Replaces "<HOST>", "<IP4>", "<IP6>", "<FID>" with default regular expression for host # # (see gh-1374 for the discussion about other candidates) # @return the replaced regular expression as string @staticmethod def _resolveHostTag(regex, useDns="yes"): openTags = dict() props = { 'nl': 0, # new lines counter by <SKIPLINES> tag; } # tag interpolation callable: def substTag(m): tag = m.group() tn = tag[1:-1] # 3 groups instead of <HOST> - separated ipv4, ipv6 and host (dns) if tn == "HOST": return R_HOST[RI_HOST if useDns not in ("no",) else RI_ADDR] # replace "<SKIPLINES>" with regular expression for multiple lines (by buffering with maxlines) if tn == "SKIPLINES": nl = props['nl'] props['nl'] = nl + 1 return r"\n(?P<skiplines%i>(?:(?:.*\n)*?))" % (nl,) # static replacement from RH4TAG: try: return RH4TAG[tn] except KeyError: pass # (begin / end tag) for customizable expressions, additionally used as # user custom tags (match will be stored in ticket data, can be used in actions): m = FCUSTNAME_CRE.match(tn) if m: # match F-... m = m.groups() tn = m[1] # close tag: if m[0]: # check it was already open: if openTags.get(tn): return ")" return tag; # tag not opened, use original # open tag: openTags[tn] = 1 # if should be mapped: tn = mapTag2Opt(tn) return "(?P<%s>" % (tn,) # original, no replacement: return tag # substitute tags: return FTAG_CRE.sub(substTag, regex) ## # Gets the regular expression. # # The effective regular expression used is returned. # @return the regular expression def getRegex(self): return self._regex ## # Returns string buffer using join of the tupleLines. # @staticmethod def _tupleLinesBuf(tupleLines): return "\n".join(["".join(v[::2]) for v in tupleLines]) + "\n" ## # Searches the regular expression. # # Sets an internal cache (match object) in order to avoid searching for # the pattern again. This method must be called before calling any other # method of this object. # @param a list of tupples. The tupples are ( prematch, datematch, postdatematch ) def search(self, tupleLines, orgLines=None): buf = tupleLines if not isinstance(tupleLines, str): buf = Regex._tupleLinesBuf(tupleLines) self._matchCache = self._regexObj.search(buf) if self._matchCache: if orgLines is None: orgLines = tupleLines # if single-line: if len(orgLines) <= 1: self._matchedTupleLines = orgLines self._unmatchedTupleLines = [] else: # Find start of the first line where the match was found try: matchLineStart = self._matchCache.string.rindex( "\n", 0, self._matchCache.start() +1 ) + 1 except ValueError: matchLineStart = 0 # Find end of the last line where the match was found try: matchLineEnd = self._matchCache.string.index( "\n", self._matchCache.end() - 1) + 1 except ValueError: matchLineEnd = len(self._matchCache.string) lineCount1 = self._matchCache.string.count( "\n", 0, matchLineStart) lineCount2 = self._matchCache.string.count( "\n", 0, matchLineEnd) self._matchedTupleLines = orgLines[lineCount1:lineCount2] self._unmatchedTupleLines = orgLines[:lineCount1] n = 0 for skippedLine in self.getSkippedLines(): for m, matchedTupleLine in enumerate( self._matchedTupleLines[n:]): if "".join(matchedTupleLine[::2]) == skippedLine: self._unmatchedTupleLines.append( self._matchedTupleLines.pop(n+m)) n += m break self._unmatchedTupleLines.extend(orgLines[lineCount2:]) # Checks if the previous call to search() matched. # # @return True if a match was found, False otherwise def hasMatched(self): if self._matchCache: return True else: return False ## # Returns all matched groups. # def _getGroups(self): return self._matchCache.groupdict() def _getGroupsWithAlt(self): fail = self._matchCache.groupdict() #fail = fail.copy() # merge alternate values (e. g. 'alt_user_1' -> 'user' or 'alt_host' -> 'host'): if self._altValues: for k,n in self._altValues: v = fail.get(k) if v and not fail.get(n): fail[n] = v # combine tuple values (e. g. 'id', 'tuple_id' ... 'tuple_id_N' -> 'id'): if self._tupleValues: for k,n in self._tupleValues: v = fail.get(k) t = fail.get(n) if isinstance(t, tuple): t += (v,) else: t = (t,v,) fail[n] = t return fail def getGroups(self): # pragma: no cover - abstract function (replaced in __init__) pass ## # Returns skipped lines. # # This returns skipped lines captured by the <SKIPLINES> tag. # @return list of skipped lines def getSkippedLines(self): if not self._matchCache: return [] skippedLines = "" n = 0 while True: try: if self._matchCache.group("skiplines%i" % n) is not None: skippedLines += self._matchCache.group("skiplines%i" % n) n += 1 except IndexError: break # KeyError is because of PyPy issue1665 affecting pypy <= 2.2.1 except KeyError: if 'PyPy' not in sys.version: # pragma: no cover - not sure this is even reachable raise break return skippedLines.splitlines(False) ## # Returns unmatched lines. # # This returns unmatched lines including captured by the <SKIPLINES> tag. # @return list of unmatched lines def getUnmatchedTupleLines(self): if not self.hasMatched(): return [] else: return self._unmatchedTupleLines def getUnmatchedLines(self): if not self.hasMatched(): return [] else: return ["".join(line) for line in self._unmatchedTupleLines] ## # Returns matched lines. # # This returns matched lines by excluding those captured # by the <SKIPLINES> tag. # @return list of matched lines def getMatchedTupleLines(self): if not self.hasMatched(): return [] else: return self._matchedTupleLines def getMatchedLines(self): if not self.hasMatched(): return [] else: return ["".join(line) for line in self._matchedTupleLines] ## # Exception dedicated to the class Regex. class RegexException(Exception): pass ## # Groups used as failure identifier. # # The order of this tuple is important while searching for failure-id # FAILURE_ID_GROPS = ("fid", "ip4", "ip6", "dns") # Additionally allows multi-line failure-id (used for wrapping e. g. conn-id to host) # FAILURE_ID_PRESENTS = FAILURE_ID_GROPS + ("mlfid",) ## # Regular expression class. # # This class represents a regular expression with its compiled version. class FailRegex(Regex): ## # Constructor. # # Creates a new object. This method can throw RegexException in order to # avoid construction of invalid object. # @param value the regular expression def __init__(self, regex, prefRegex=None, **kwargs): # Initializes the parent. Regex.__init__(self, regex, **kwargs) # Check for group "dns", "ip4", "ip6", "fid" if (not [grp for grp in FAILURE_ID_PRESENTS if grp in self._regexObj.groupindex] and (prefRegex is None or not [grp for grp in FAILURE_ID_PRESENTS if grp in prefRegex._regexObj.groupindex]) ): raise RegexException("No failure-id group in '%s'" % self._regex) ## # Returns the matched failure id. # # This corresponds to the pattern matched by the named group from given groups. # @return the matched failure-id def getFailID(self, groups=FAILURE_ID_GROPS): fid = None for grp in groups: try: fid = self._matchCache.group(grp) except (IndexError, KeyError): continue if fid is not None: break if fid is None: # Gets a few information. s = self._matchCache.string r = self._matchCache.re raise RegexException("No group found in '%s' using '%s'" % (s, r)) return str(fid) ## # Returns the matched host. # # This corresponds to the pattern matched by the named group "ip4", "ip6" or "dns". # @return the matched host def getHost(self): return self.getFailID(("ip4", "ip6", "dns")) def getIP(self): fail = self.getGroups() return IPAddr(self.getFailID(("ip4", "ip6")), int(fail.get("cidr") or IPAddr.CIDR_UNSPEC))
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