From a7bcd67e33f4b56f0a286c587ea088eb626a969b Mon Sep 17 00:00:00 2001 From: "mergify[bot]" <37929162+mergify[bot]@users.noreply.github.com> Date: Thu, 17 Feb 2022 23:50:35 +0100 Subject: [PATCH] [8.1](backport #30382) [Filebeat] [auditd]: Support EXECVE events with truncated argument list (#30457) * [Filebeat] [auditd]: Support EXECVE events with truncated argument list (#30382) This modifies Filebeat's auditd pipeline to support parsing of EXECVE records with truncated argument lists. When such a log is found, the arguments will be appended to process.args with a leading entry informing about the truncation. This is to prevent a mapping explosion in Filebeat when a lot of these logs are ingested with the previous pipeline version. (cherry picked from commit 79229e7e79ed65e37b0746b306e6ee2e0e6d0690) Co-authored-by: Adrian Serrano --- CHANGELOG.next.asciidoc | 1 + .../module/auditd/log/ingest/pipeline.yml | 58 +++-- filebeat/module/auditd/log/test/rare.log | 4 + .../auditd/log/test/rare.log-expected.json | 226 ++++++++++++++++++ 4 files changed, 274 insertions(+), 15 deletions(-) create mode 100644 filebeat/module/auditd/log/test/rare.log create mode 100644 filebeat/module/auditd/log/test/rare.log-expected.json diff --git a/CHANGELOG.next.asciidoc b/CHANGELOG.next.asciidoc index 5adc32b7915e..75055db456e5 100644 --- a/CHANGELOG.next.asciidoc +++ b/CHANGELOG.next.asciidoc @@ -52,6 +52,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d *Filebeat* - Fix broken Kafka input {issue}29746[29746] {pull}30277[30277] +- auditd: Prevent mapping explosion when truncated EXECVE records are ingested. {pull}30382[30382] *Heartbeat* diff --git a/filebeat/module/auditd/log/ingest/pipeline.yml b/filebeat/module/auditd/log/ingest/pipeline.yml index b169fb4dd581..544098f291e8 100644 --- a/filebeat/module/auditd/log/ingest/pipeline.yml +++ b/filebeat/module/auditd/log/ingest/pipeline.yml @@ -2102,28 +2102,56 @@ processors: ignore_failure: true field: auditd.log.msg target_field: message + +# The processor below populates process.args list from argN fields. +# +# It handles the common case of a complete record: Contains argc=N and a0 to aN-1, +# and the truncated case: Contains aI, aI+1, ..., aN-1, for I>0, and no argc. - script: lang: painless - description: Extracts process information from execve calls - if: 'ctx.process?.args_count != null && ctx.auditd?.log != null' + description: Extracts process arguments from EXECVE calls. + if: 'ctx.auditd?.log?.record_type == "EXECVE"' source: >- - long argc = ctx.process.args_count; - List args = new ArrayList(); - def[] fmt = new def[] {0}; - for (long i=0; i argRegex.matcher(x)) + /* Drop elements that didn't match the regex */ + .filter(x -> x.matches()) + /* Must save to a list because it needs to remove keys in auditd.log, + which cannot be done while streaming from this source */ + .collect(Collectors.toList()); + + List args = keys.stream() + /* List to List<[Matcher, Value for given key]> + with side effect of removing the key */ + .map(x -> [x, ctx.auditd.log.remove(x.group(0))]) + /* Drop elements that end in _len, just wanted to remove them */ + .filter(x -> x[0].group(2) != "_len") + /* List to List<[Int, Value]> + where the Int is the argument index */ + .map(x -> [Integer.parseInt(x[0].group(1)), x[1]]) + /* Sort by numeric argument index */ + .sorted((lhs, rhs) -> lhs[0].compareTo(rhs[0])) + /* Save as List<[Index, Value]> */ + .collect(Collectors.toList()); + + if (args.isEmpty()) return; + if (ctx.process == null) ctx.process = new HashMap(); + ctx.process.args = args.stream().map(x -> x[1]).collect(Collectors.toList()); + def firstIndex = args[0][0]; + if (firstIndex == 0) { + ctx.process.executable = ctx.process.args[0]; + } else { + ctx.process.args.add(0, "[... " + firstIndex + " truncated arguments ...]"); } - if (args.size() == 0) return; - ctx.process.put("args", args); - ctx.process.put("executable", args[0]); + on_failure: - append: field: error.message - value: "failed extracting process arguments: {{ _ingest.on_failure_message }}" + value: "failed extracting process arguments: {{{ _ingest.on_failure_message }}}" - rename: ignore_failure: true diff --git a/filebeat/module/auditd/log/test/rare.log b/filebeat/module/auditd/log/test/rare.log new file mode 100644 index 000000000000..2cbeb78addbb --- /dev/null +++ b/filebeat/module/auditd/log/test/rare.log @@ -0,0 +1,4 @@ +type=EXECVE msg=audit(1643025668.518:5009988): a8_len=1 a8[0]=8 a9=9 a10=10 a11[1]=11 +type=EXECVE msg=audit(1643025668.518:5009988): a10517="/redacted/path/for/arg10517" a10518="/redacted/path/for/arg10518" a10519="/redacted/path/for/arg10519" a10520="/redacted/path/for/arg10520" a10521="/redacted/path/for/arg10521" a10522="/redacted/path/for/arg10522" a10523="/redacted/path/for/arg10523" a10524="/redacted/path/for/arg10524" a10525="/redacted/path/for/arg10525" a10526="/redacted/path/for/arg10526" a10527="/redacted/path/for/arg10527" a10528="/redacted/path/for/arg10528" a10529="/redacted/path/for/arg10529" a10530="/redacted/path/for/arg10530" a10531="/redacted/path/for/arg10531" a10532="/redacted/path/for/arg10532" a10533="/redacted/path/for/arg10533" a10534="/redacted/path/for/arg10534" a10535="/redacted/path/for/arg10535" a10536="/redacted/path/for/arg10536" a10537="/redacted/path/for/arg10537" a10538="/redacted/path/for/arg10538" a10539="/redacted/path/for/arg10539" a10540="/redacted/path/for/arg10540" a10541="/redacted/path/for/arg10541" a10542="/redacted/path/for/arg10542" a10543="/redacted/path/for/arg10543" a10544="/redacted/path/for/arg10544" a10545="/redacted/path/for/arg10545" a10546="/redacted/path/for/arg10546" a10547="/redacted/path/for/arg10547" a10548="/redacted/path/for/arg10548" a10549="/redacted/path/for/arg10549" a10550="/redacted/path/for/arg10550" a10551="/redacted/path/for/arg10551" a10552="/redacted/path/for/arg10552" a10553="/redacted/path/for/arg10553" a10554="/redacted/path/for/arg10554" a10555="/redacted/path/for/arg10555" a10556="/redacted/path/for/arg10556" a10557="/redacted/path/for/arg10557" a10558="/redacted/path/for/arg10558" a10559="/redacted/path/for/arg10559" a10560="/redacted/path/for/arg10560" a10561="/redacted/path/for/arg10561" a10562="/redacted/path/for/arg10562" a10563="/redacted/path/for/arg10563" a10564="/redacted/path/for/arg10564" a10565="/redacted/path/for/arg10565" a10566="/redacted/path/for/arg10566" a10567="/redacted/path/for/arg10567" a10568="/redacted/path/for/arg10568" a10569="/redacted/path/for/arg10569" a10570="/redacted/path/for/arg10570" a10571="/redacted/path/for/arg10571" a10572="/redacted/path/for/arg10572" a10573="/redacted/path/for/arg10573" a10574="/redacted/path/for/arg10574" a10575="/redacted/path/for/arg10575" a10576="/redacted/path/for/arg10576" a10577="/redacted/path/for/arg10577" a10578="/redacted/path/for/arg10578" a10579="/redacted/path/for/arg10579" a10580="/redacted/path/for/arg10580" a10581="/redacted/path/for/arg10581" a10582="/redacted/path/for/arg10582" a10583="/redacted/path/for/arg10583" a10584="/redacted/path/for/arg10584" a10585="/redacted/path/for/arg10585" a10586="/redacted/path/for/arg10586" a10587_len=95 a10587[0]="/redacted/path" +type=EXECVE msg=audit(1643025668.518:5009988): a10091="/redacted/path/for/arg10091" a10092="/redacted/path/for/arg10092" a10093="/redacted/path/for/arg10093" a10094="/redacted/path/for/arg10094" a10095="/redacted/path/for/arg10095" a10096="/redacted/path/for/arg10096" a10097="/redacted/path/for/arg10097" a10098="/redacted/path/for/arg10098" a10099="/redacted/path/for/arg10099" a10100="/redacted/path/for/arg10100" a10101="/redacted/path/for/arg10101" a10102="/redacted/path/for/arg10102" a10103="/redacted/path/for/arg10103" a10104="/redacted/path/for/arg10104" a10105="/redacted/path/for/arg10105" a10106="/redacted/path/for/arg10106" a10107="/redacted/path/for/arg10107" a10108="/redacted/path/for/arg10108" a10109="/redacted/path/for/arg10109" a10110="/redacted/path/for/arg10110" a10111="/redacted/path/for/arg10111" a10112="/redacted/path/for/arg10112" a10113="/redacted/path/for/arg10113" a10114="/redacted/path/for/arg10114" a10115="/redacted/path/for/arg10115" a10116="/redacted/path/for/arg10116" a10117="/redacted/path/for/arg10117" a10118="/redacted/path/for/arg10118" a10119="/redacted/path/for/arg10119" a10120="/redacted/path/for/arg10120" a10121="/redacted/path/for/arg10121" a10122="/redacted/path/for/arg10122" a10123="/redacted/path/for/arg10123" a10124="/redacted/path/for/arg10124" a10125="/redacted/path/for/arg10125" a10126="/redacted/path/for/arg10126" a10127="/redacted/path/for/arg10127" a10128="/redacted/path/for/arg10128" a10129="/redacted/path/for/arg10129" a10130="/redacted/path/for/arg10130" a10131="/redacted/path/for/arg10131" a10132="/redacted/path/for/arg10132" a10133="/redacted/path/for/arg10133" a10134="/redacted/path/for/arg10134" a10135="/redacted/path/for/arg10135" a10136="/redacted/path/for/arg10136" a10137="/redacted/path/for/arg10137" a10138="/redacted/path/for/arg10138" a10139="/redacted/path/for/arg10139" a10140="/redacted/path/for/arg10140" a10141="/redacted/path/for/arg10141" a10142="/redacted/path/for/arg10142" a10143="/redacted/path/for/arg10143" a10144="/redacted/path/for/arg10144" a10145="/redacted/path/for/arg10145" a10146="/redacted/path/for/arg10146" a10147="/redacted/path/for/arg10147" a10148="/redacted/path/for/arg10148" a10149="/redacted/path/for/arg10149" a10150="/redacted/path/for/arg10150" a10151="/redacted/path/for/arg10151" a10152="/redacted/path/for/arg10152" a10153="/redacted/path/for/arg10153" a10154="/redacted/path/for/arg10154" a10155="/redacted/path/for/arg10155" a10156="/redacted/path/for/arg10156" a10157="/redacted/path/for/arg10157" a10158="/redacted/path/for/arg10158" a10159="/redacted/path/for/arg10159" a10160="/redacted/path/for/arg10160" a10161_len=95 a10161[0]="/redacted/path" +type=EXECVE msg=audit(1644323462.830:9381969): a73[1]="arg73.gz" a74="/redacted/path/for/arg74" a75="/redacted/path/for/arg75" a76="/redacted/path/for/arg76" a77="/redacted/path/for/arg77" a78="/redacted/path/for/arg78" a79="/redacted/path/for/arg79" a80="/redacted/path/for/arg80" a81="/redacted/path/for/arg81" a82="/redacted/path/for/arg82" a83="/redacted/path/for/arg83" a84="/redacted/path/for/arg84" a85="/redacted/path/for/arg85" a86="/redacted/path/for/arg86" a87="/redacted/path/for/arg87" diff --git a/filebeat/module/auditd/log/test/rare.log-expected.json b/filebeat/module/auditd/log/test/rare.log-expected.json new file mode 100644 index 000000000000..6d0fb82937bd --- /dev/null +++ b/filebeat/module/auditd/log/test/rare.log-expected.json @@ -0,0 +1,226 @@ +[ + { + "@timestamp": "2022-01-24T12:01:08.518Z", + "auditd.log.sequence": 5009988, + "event.action": "execve", + "event.dataset": "auditd.log", + "event.kind": "event", + "event.module": "auditd", + "event.original": "type=EXECVE msg=audit(1643025668.518:5009988): a8_len=1 a8[0]=8 a9=9 a10=10 a11[1]=11", + "fileset.name": "log", + "input.type": "log", + "log.offset": 0, + "process.args": [ + "[... 8 truncated arguments ...]", + "8", + "9", + "10", + "11" + ], + "service.type": "auditd" + }, + { + "@timestamp": "2022-01-24T12:01:08.518Z", + "auditd.log.sequence": 5009988, + "event.action": "execve", + "event.dataset": "auditd.log", + "event.kind": "event", + "event.module": "auditd", + "event.original": "type=EXECVE msg=audit(1643025668.518:5009988): a10517=\"/redacted/path/for/arg10517\" a10518=\"/redacted/path/for/arg10518\" a10519=\"/redacted/path/for/arg10519\" a10520=\"/redacted/path/for/arg10520\" a10521=\"/redacted/path/for/arg10521\" a10522=\"/redacted/path/for/arg10522\" a10523=\"/redacted/path/for/arg10523\" a10524=\"/redacted/path/for/arg10524\" a10525=\"/redacted/path/for/arg10525\" a10526=\"/redacted/path/for/arg10526\" a10527=\"/redacted/path/for/arg10527\" a10528=\"/redacted/path/for/arg10528\" a10529=\"/redacted/path/for/arg10529\" a10530=\"/redacted/path/for/arg10530\" a10531=\"/redacted/path/for/arg10531\" a10532=\"/redacted/path/for/arg10532\" a10533=\"/redacted/path/for/arg10533\" a10534=\"/redacted/path/for/arg10534\" a10535=\"/redacted/path/for/arg10535\" a10536=\"/redacted/path/for/arg10536\" a10537=\"/redacted/path/for/arg10537\" a10538=\"/redacted/path/for/arg10538\" a10539=\"/redacted/path/for/arg10539\" a10540=\"/redacted/path/for/arg10540\" a10541=\"/redacted/path/for/arg10541\" a10542=\"/redacted/path/for/arg10542\" a10543=\"/redacted/path/for/arg10543\" a10544=\"/redacted/path/for/arg10544\" a10545=\"/redacted/path/for/arg10545\" a10546=\"/redacted/path/for/arg10546\" a10547=\"/redacted/path/for/arg10547\" a10548=\"/redacted/path/for/arg10548\" a10549=\"/redacted/path/for/arg10549\" a10550=\"/redacted/path/for/arg10550\" a10551=\"/redacted/path/for/arg10551\" a10552=\"/redacted/path/for/arg10552\" a10553=\"/redacted/path/for/arg10553\" a10554=\"/redacted/path/for/arg10554\" a10555=\"/redacted/path/for/arg10555\" a10556=\"/redacted/path/for/arg10556\" a10557=\"/redacted/path/for/arg10557\" a10558=\"/redacted/path/for/arg10558\" a10559=\"/redacted/path/for/arg10559\" a10560=\"/redacted/path/for/arg10560\" a10561=\"/redacted/path/for/arg10561\" a10562=\"/redacted/path/for/arg10562\" a10563=\"/redacted/path/for/arg10563\" a10564=\"/redacted/path/for/arg10564\" a10565=\"/redacted/path/for/arg10565\" a10566=\"/redacted/path/for/arg10566\" a10567=\"/redacted/path/for/arg10567\" a10568=\"/redacted/path/for/arg10568\" a10569=\"/redacted/path/for/arg10569\" a10570=\"/redacted/path/for/arg10570\" a10571=\"/redacted/path/for/arg10571\" a10572=\"/redacted/path/for/arg10572\" a10573=\"/redacted/path/for/arg10573\" a10574=\"/redacted/path/for/arg10574\" a10575=\"/redacted/path/for/arg10575\" a10576=\"/redacted/path/for/arg10576\" a10577=\"/redacted/path/for/arg10577\" a10578=\"/redacted/path/for/arg10578\" a10579=\"/redacted/path/for/arg10579\" a10580=\"/redacted/path/for/arg10580\" a10581=\"/redacted/path/for/arg10581\" a10582=\"/redacted/path/for/arg10582\" a10583=\"/redacted/path/for/arg10583\" a10584=\"/redacted/path/for/arg10584\" a10585=\"/redacted/path/for/arg10585\" a10586=\"/redacted/path/for/arg10586\" a10587_len=95 a10587[0]=\"/redacted/path\"", + "fileset.name": "log", + "input.type": "log", + "log.offset": 86, + "process.args": [ + "[... 10517 truncated arguments ...]", + "/redacted/path/for/arg10517", + "/redacted/path/for/arg10518", + "/redacted/path/for/arg10519", + "/redacted/path/for/arg10520", + "/redacted/path/for/arg10521", + "/redacted/path/for/arg10522", + "/redacted/path/for/arg10523", + "/redacted/path/for/arg10524", + "/redacted/path/for/arg10525", + "/redacted/path/for/arg10526", + "/redacted/path/for/arg10527", + "/redacted/path/for/arg10528", + "/redacted/path/for/arg10529", + "/redacted/path/for/arg10530", + "/redacted/path/for/arg10531", + "/redacted/path/for/arg10532", + "/redacted/path/for/arg10533", + "/redacted/path/for/arg10534", + "/redacted/path/for/arg10535", + "/redacted/path/for/arg10536", + "/redacted/path/for/arg10537", + "/redacted/path/for/arg10538", + "/redacted/path/for/arg10539", + "/redacted/path/for/arg10540", + "/redacted/path/for/arg10541", + "/redacted/path/for/arg10542", + "/redacted/path/for/arg10543", + "/redacted/path/for/arg10544", + "/redacted/path/for/arg10545", + "/redacted/path/for/arg10546", + "/redacted/path/for/arg10547", + "/redacted/path/for/arg10548", + "/redacted/path/for/arg10549", + "/redacted/path/for/arg10550", + "/redacted/path/for/arg10551", + "/redacted/path/for/arg10552", + "/redacted/path/for/arg10553", + "/redacted/path/for/arg10554", + "/redacted/path/for/arg10555", + "/redacted/path/for/arg10556", + "/redacted/path/for/arg10557", + "/redacted/path/for/arg10558", + "/redacted/path/for/arg10559", + "/redacted/path/for/arg10560", + "/redacted/path/for/arg10561", + "/redacted/path/for/arg10562", + "/redacted/path/for/arg10563", + "/redacted/path/for/arg10564", + "/redacted/path/for/arg10565", + "/redacted/path/for/arg10566", + "/redacted/path/for/arg10567", + "/redacted/path/for/arg10568", + "/redacted/path/for/arg10569", + "/redacted/path/for/arg10570", + "/redacted/path/for/arg10571", + "/redacted/path/for/arg10572", + "/redacted/path/for/arg10573", + "/redacted/path/for/arg10574", + "/redacted/path/for/arg10575", + "/redacted/path/for/arg10576", + "/redacted/path/for/arg10577", + "/redacted/path/for/arg10578", + "/redacted/path/for/arg10579", + "/redacted/path/for/arg10580", + "/redacted/path/for/arg10581", + "/redacted/path/for/arg10582", + "/redacted/path/for/arg10583", + "/redacted/path/for/arg10584", + "/redacted/path/for/arg10585", + "/redacted/path/for/arg10586", + "/redacted/path" + ], + "service.type": "auditd" + }, + { + "@timestamp": "2022-01-24T12:01:08.518Z", + "auditd.log.sequence": 5009988, + "event.action": "execve", + "event.dataset": "auditd.log", + "event.kind": "event", + "event.module": "auditd", + "event.original": "type=EXECVE msg=audit(1643025668.518:5009988): a10091=\"/redacted/path/for/arg10091\" a10092=\"/redacted/path/for/arg10092\" a10093=\"/redacted/path/for/arg10093\" a10094=\"/redacted/path/for/arg10094\" a10095=\"/redacted/path/for/arg10095\" a10096=\"/redacted/path/for/arg10096\" a10097=\"/redacted/path/for/arg10097\" a10098=\"/redacted/path/for/arg10098\" a10099=\"/redacted/path/for/arg10099\" a10100=\"/redacted/path/for/arg10100\" a10101=\"/redacted/path/for/arg10101\" a10102=\"/redacted/path/for/arg10102\" a10103=\"/redacted/path/for/arg10103\" a10104=\"/redacted/path/for/arg10104\" a10105=\"/redacted/path/for/arg10105\" a10106=\"/redacted/path/for/arg10106\" a10107=\"/redacted/path/for/arg10107\" a10108=\"/redacted/path/for/arg10108\" a10109=\"/redacted/path/for/arg10109\" a10110=\"/redacted/path/for/arg10110\" a10111=\"/redacted/path/for/arg10111\" a10112=\"/redacted/path/for/arg10112\" a10113=\"/redacted/path/for/arg10113\" a10114=\"/redacted/path/for/arg10114\" a10115=\"/redacted/path/for/arg10115\" a10116=\"/redacted/path/for/arg10116\" a10117=\"/redacted/path/for/arg10117\" a10118=\"/redacted/path/for/arg10118\" a10119=\"/redacted/path/for/arg10119\" a10120=\"/redacted/path/for/arg10120\" a10121=\"/redacted/path/for/arg10121\" a10122=\"/redacted/path/for/arg10122\" a10123=\"/redacted/path/for/arg10123\" a10124=\"/redacted/path/for/arg10124\" a10125=\"/redacted/path/for/arg10125\" a10126=\"/redacted/path/for/arg10126\" a10127=\"/redacted/path/for/arg10127\" a10128=\"/redacted/path/for/arg10128\" a10129=\"/redacted/path/for/arg10129\" a10130=\"/redacted/path/for/arg10130\" a10131=\"/redacted/path/for/arg10131\" a10132=\"/redacted/path/for/arg10132\" a10133=\"/redacted/path/for/arg10133\" a10134=\"/redacted/path/for/arg10134\" 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a10160=\"/redacted/path/for/arg10160\" a10161_len=95 a10161[0]=\"/redacted/path\"", + "fileset.name": "log", + "input.type": "log", + "log.offset": 2764, + "process.args": [ + "[... 10091 truncated arguments ...]", + "/redacted/path/for/arg10091", + "/redacted/path/for/arg10092", + "/redacted/path/for/arg10093", + "/redacted/path/for/arg10094", + "/redacted/path/for/arg10095", + "/redacted/path/for/arg10096", + "/redacted/path/for/arg10097", + "/redacted/path/for/arg10098", + "/redacted/path/for/arg10099", + "/redacted/path/for/arg10100", + "/redacted/path/for/arg10101", + "/redacted/path/for/arg10102", + "/redacted/path/for/arg10103", + "/redacted/path/for/arg10104", + "/redacted/path/for/arg10105", + "/redacted/path/for/arg10106", + "/redacted/path/for/arg10107", + "/redacted/path/for/arg10108", + "/redacted/path/for/arg10109", + "/redacted/path/for/arg10110", + "/redacted/path/for/arg10111", + "/redacted/path/for/arg10112", + "/redacted/path/for/arg10113", + 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