Ensure Hostname verification for TLS communication is enabled

高レベル 1自動websphere

説明

Hostname verification is a server identity check that is used to ensure that a client is talking to the correct server. The check is performed on the client side of an SSL communication and involves looking at the server’s certificate Subject Alternative Name (or the SubjectDN) to see if it matches the host part of the URL that was used to make the outbound request. Audit: reads server.xml, configDropins/defaults/*.xml, configDropins/overrides/*.xml and files pulled in with <include> for every Liberty server found under WLP_USER_DIR, /opt/ibm/wlp/usr, /opt/IBM/WebSphere/Liberty/usr, /opt/ol/wlp/usr, /usr/local/wlp/usr or /config; it ignores XML comments and fails if no server.xml is readable. Every <ssl> must set verifyHostname="true" and any <webTarget> must not set disableCNCheck="true".

チェック方法

監査方法: シェルコマンド

shell

bad=0; n=0; nl='
'
r=""
for b in "${WLP_USER_DIR:-}" /opt/ibm/wlp/usr /opt/IBM/WebSphere/Liberty/usr /opt/ol/wlp/usr /usr/local/wlp/usr; do
  [ -n "$b" ] && [ -d "$b/servers" ] || continue
  for s in "$b"/servers/*/; do [ -f "${s}server.xml" ] && r="$r$s$nl"; done
done
[ -f /config/server.xml ] && r="$r/config/$nl"
strip(){ awk 'BEGIN{RS="<!--"} NR==1{printf "%s",$0; next} {i=index($0,"-->"); if(i) printf "%s",substr($0,i+3)}'; }
gather(){ s=$1; { cat "${s}server.xml" "${s}"configDropins/defaults/*.xml "${s}"configDropins/overrides/*.xml; } 2>/dev/null | strip
  for loc in $(cat "${s}server.xml" "${s}"configDropins/defaults/*.xml "${s}"configDropins/overrides/*.xml 2>/dev/null | strip | tr '\r\n\t' '   ' | grep -oE '<include[[:space:]][^>]*>' | sed -n 's/.*location[[:space:]]*=[[:space:]]*"\([^"]*\)".*/\1/p'); do
    case $loc in http*) continue;; esac; loc=$(printf '%s' "$loc" | sed "s#\${server.config.dir}/*##"); case $loc in /*) f=$loc;; *) f=$s$loc;; esac
    [ -f "$f" ] && strip < "$f"; done; }
tag(){ printf '%s\n' "$X" | grep -oE "<$1([[:space:]][^>]*)?>"; }
chk(){ t=$(tag "$1"); if [ -z "$t" ]; then [ "$5" = na ] && return 0; [ "$4" = y ] && return 0; return 1; fi
  tot=$(printf '%s\n' "$t" | grep -c ''); v=$(printf '%s\n' "$t" | sed -n "s/.*[[:space:]]$2[[:space:]]*=[[:space:]]*[\"']\([^\"']*\)[\"'].*/\1/p"); st=0
  [ -n "$v" ] && st=$(printf '%s\n' "$v" | grep -c ''); case " config httpSession webAppSecurity jwtSso webContainer httpDispatcher applicationMonitor sslDefault httpOptions ltpa mpMetrics samesite transportLayer authenticationLayer attributeLayer " in *" $1 "*) [ "$st" -gt 0 ] && tot=$st;; esac; ok=$3; neg=n; case $ok in '!'*) neg=y; ok=${ok#!};; esac
  if [ "$st" -gt 0 ]; then m=$(printf '%s\n' "$v" | grep -ciE "^($ok)\$"); if [ "$neg" = n ]; then [ "$m" -eq "$st" ] || return 1; else [ "$m" -eq 0 ] || return 1; fi; fi
  [ "$st" -lt "$tot" ] && [ "$4" != y ] && return 1; return 0; }
IFS="$nl"; for s in $r; do n=$((n+1)); X=$(gather "$s" | tr '\r\n\t' '   ' | tr -s ' ')
chk ssl verifyHostname true n d || bad=1
chk webTarget disableCNCheck false y na || bad=1
done; unset IFS; [ "$n" -gt 0 ] || exit 1; [ "$bad" -eq 0 ] && echo compliant || echo noncompliant

期待される出力: compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

Enable hostname verification in the SSL configuration by adding the verifyHostname attribute to the ssl configuration element in ${server.config.dir}/configDropins/overrides/<any file name>.xml <ssl ... verifyHostname="true" /> For JAX-RS client, enable hostname verification in the webTarget element by adding the disableCNCheck attribute in ${server.config.dir}/configDropins/overrides/<any file name>.xml <webTarget ... disableCNCheck="false" />

プロパティ

オペレーティングシステム: すべて
タグ: webspheretls
参照: CIS IBM WebSphere Liberty Benchmark v1.0.0 - 4.2.7 Ensure Hostname verification for TLS communication is enabled

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監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

shell

tmaegis scan --target websphere