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Merge pull request #2716 from testssl/sanitze_http_header_better

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Sanitze HTTP header early and better
This commit is contained in:
Dirk Wetter
2025-03-20 15:44:28 +01:00
committed by GitHub
parent 692b9c9260 a17bb42a37
commit 5359befc60
1 changed files with 14 additions and 16 deletions
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30
testssl.sh
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@@ -2490,6 +2490,16 @@ connectivity_problem() {
fi
}
sanitze_http_header() {
# sed implementations tested were sometime not fine with header containing x0d x0a (CRLF) which is the usual
# case. Also we use tr here to remove any crtl chars which the server side offers --> possible security problem
# Only allowed now is LF + CR. See #2337. awk, see above, doesn't seem to care -- but not under MacOS.
sed -e '/^$/q' -e '/^[^a-zA-Z_0-9]$/q' $HEADERFILE | tr -d '\000-\011\013\014\016-\037' >$HEADERFILE.tmp
# Now to be more sure we delete from '<' or '{' maybe with a leading blank until the end
sed -e '/^ *<.*$/d' -e '/^ *{.*$/d' $HEADERFILE.tmp >$HEADERFILE
debugme echo -e "---\n $(< $HEADERFILE) \n---"
}
#problems not handled: chunked
run_http_header() {
@@ -2520,16 +2530,14 @@ run_http_header() {
# Doing it again in the foreground to get an accurate header time
tm_out "$GET_REQ11" | $OPENSSL s_client $(s_client_options "$OPTIMAL_PROTO $BUGS -quiet -ign_eof -connect $NODEIP:$PORT $PROXY $SNI") >$HEADERFILE 2>$ERRFILE
NOW_TIME=$(date "+%s")
HTTP_TIME=$(awk -F': ' '/^date:/ { print $2 } /^Date:/ { print $2 }' $HEADERFILE)
HTTP_AGE=$(awk -F': ' '/^[aA][gG][eE]: / { print $2 }' $HEADERFILE)
HAD_SLEPT=0
sanitze_http_header
else
sanitze_http_header
# 1st GET request hung and needed to be killed. Check whether it succeeded anyway:
if grep -Eiaq "XML|HTML|DOCTYPE|HTTP|Connection" $HEADERFILE; then
# correct by seconds we slept, HAD_SLEPT comes from wait_kill()
NOW_TIME=$(($(date "+%s") - HAD_SLEPT))
HTTP_TIME=$(awk -F': ' '/^date:/ { print $2 } /^Date:/ { print $2 }' $HEADERFILE)
HTTP_AGE=$(awk -F': ' '/^[aA][gG][eE]: / { print $2 }' $HEADERFILE)
else
prln_warning " likely HTTP header requests failed (#lines: $(wc -l $HEADERFILE | awk '{ print $1 }'))"
[[ "$DEBUG" -lt 1 ]] && outln "Rerun with DEBUG>=1 and inspect $HEADERFILE\n"
@@ -2538,6 +2546,8 @@ run_http_header() {
((NR_HEADER_FAIL++))
fi
fi
HTTP_TIME=$(awk -F': ' '/^date:/ { print $2 } /^Date:/ { print $2 }' $HEADERFILE)
HTTP_AGE=$(awk -F': ' '/^[aA][gG][eE]: / { print $2 }' $HEADERFILE)
if [[ ! -s $HEADERFILE ]]; then
((NR_HEADER_FAIL++))
if [[ $NR_HEADER_FAIL -ge $MAX_HEADER_FAIL ]]; then
@@ -2565,18 +2575,6 @@ run_http_header() {
[[ -n "$HTTP_TIME" ]] && HTTP_TIME="$(strip_lf "$HTTP_TIME")"
debugme echo "NOW_TIME: $NOW_TIME | HTTP_AGE: $HTTP_AGE | HTTP_TIME: $HTTP_TIME"
# Quit on first empty line to catch 98% of the cases. Next pattern is there because the SEDs tested
# so far seem not to be fine with header containing x0d x0a (CRLF) which is the usual case.
# So we also trigger also on any sign on a single line which is not alphanumeric (plus _)
#
# Also we use tr here to remove any crtl chars which the server side offers --> possible security problem
# Only allowed now is LF + CR. See #2337
# awk, see above, doesn't seem to care
sed -e '/^$/q' -e '/^[^a-zA-Z_0-9]$/q' $HEADERFILE | tr -d '\000-\011\013\014\016-\037' >$HEADERFILE.tmp
# Now to be more sure we delete from '<' or '{' maybe with a leading blank until the end
sed -e '/^ *<.*$/d' -e '/^ *{.*$/d' $HEADERFILE.tmp >$HEADERFILE
debugme echo -e "---\n $(< $HEADERFILE) \n---"
HTTP_STATUS_CODE=$(awk '/^HTTP\// { print $2 }' $HEADERFILE 2>>$ERRFILE)
msg_thereafter=$(awk -F"$HTTP_STATUS_CODE" '/^HTTP\// { print $2 }' $HEADERFILE 2>>$ERRFILE) # dirty trick to use the status code as a
msg_thereafter=$(strip_lf "$msg_thereafter") # field separator, otherwise we need a loop with awk