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Feature: Detection STARTTLS throtteling via code 421/SMTP

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For this anotehr variable needed to be passed to starttls_full_read()
via starttls_smtp_dialog, where the variable is defined.

Handling of the connection problem will occur at the calling level, fd_socket(),
so that in the future this can be extended if another STARTTLS problem signals
that we're too fast.

Fixes #2098.
This commit is contained in:
Dirk 2025-01-31 11:26:44 +01:00
parent aa4e9a4d41
commit e73a2a9d53
1 changed files with 23 additions and 6 deletions
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25
testssl.sh
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@ -11466,6 +11466,7 @@ starttls_full_read(){
local end_pattern="$2"
local starttls_regex="$3" # optional: pattern we search for in the server's response
local debug_str="$4" # optional
local problem_pattern="$5" # optional: used currently only for 421 code
local starttls_read_data=()
local one_line=""
local ret=0
@ -11486,7 +11487,7 @@ starttls_full_read(){
while read -r -t $STARTTLS_SLEEP one_line; ret=$?; (exit $ret); do
debugme tmln_out "S: ${one_line}"
if [[ $DEBUG -ge 5 ]]; then
echo "end_pattern/cont_pattern: ${end_pattern} / ${cont_pattern}"
echo "end / cont problem pattern: ${end_pattern} / ${cont_pattern} / ${problem_pattern}"
fi
if [[ -n "$starttls_regex" ]]; then
if [[ ${one_line} =~ $starttls_regex ]]; then
@ -11494,6 +11495,13 @@ starttls_full_read(){
# We don't exit here as the buffer is not empty. So we continue reading but save the status:
ret_found=0
fi
elif [[ -n "$problem_pattern" ]]; then
if [[ ${one_line} =~ ${problem_pattern} ]]; then
debugme echo "=== matches ${problem_pattern} ==="
IFS="${oldIFS}"
ret_found=4
break
fi
fi
starttls_read_data+=("${one_line}")
if [[ ${one_line} =~ ${end_pattern} ]]; then
@ -11542,6 +11550,7 @@ starttls_smtp_dialog() {
local greet_str="EHLO testssl.sh"
local proto="smtp"
local reSTARTTLS='^250[ -]STARTTLS'
local reToofast='^421 ' # 421 4.7.0 .* Error: too many connections, see #2098
local starttls="STARTTLS"
local -i ret=0
@ -11553,13 +11562,14 @@ starttls_smtp_dialog() {
fi
debugme echo "=== starting $proto STARTTLS dialog ==="
starttls_full_read '^220-' '^220 ' '' "received server greeting" &&
starttls_full_read '^220-' '^220 ' '' "received server greeting" "${reToofast}" &&
starttls_just_send "$greet_str" "sent $greet_str" &&
starttls_full_read '^250-' '^250 ' "${reSTARTTLS}" "received server capabilities and checked STARTTLS availability" &&
starttls_just_send "$starttls" "initiated STARTTLS" &&
starttls_full_read '^220-' '^220 ' '' "received ack for STARTTLS"
ret=$?
debugme echo "=== finished $proto STARTTLS dialog with ${ret} ==="
# ret will be 4 if $reToofast matches
return $ret
}
@ -11781,9 +11791,13 @@ starttls_telnet_dialog() {
return $ret
}
# arg1: fd for socket -- which we don't use yes as it is a hassle (not clear whether it works under every bash version)
# arg1: fd for socket (which we don't use yet. It's a hassle, not clear whether it works under every bash version
# arg2: optional: for STARTTLS additional command to be injected
# returns 6 if opening the socket caused a problem, 1 if STARTTLS handshake failed, 0: all ok
# return values:
# 0: all ok
# 1: STARTTLS handshake failed
# 4: throtteling on STARTTLS level encountered
# 6: if opening the socket caused a problem
#
fd_socket() {
local fd="$1"
@ -11902,6 +11916,9 @@ fd_socket() {
case $ret in
0) return 0 ;;
3) fatal "No STARTTLS found in handshake" $ERR_CONNECT ;;
4) ((NR_STARTTLS_FAIL++))
connectivity_problem $NR_STARTTLS_FAIL $MAX_STARTTLS_FAIL "Throtteling detected (STARTTLS server msg 421)" "repeated STARTTLS problems due to throtteling, giving up"
return 4 ;;
*) if [[ $ret -eq 2 ]] && [[ -n "$payload" ]]; then
# We don't want this handling for STARTTLS injection
return 0