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Merge pull request #2297 from drwetter/ldap_starttls_improvements

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Add logic for STARTTLS enabled AD servers
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Dirk Wetter 2023-01-17 14:27:01 +01:00 committed by GitHub
commit 8099dc0106
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1 changed files with 41 additions and 16 deletions
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testssl.sh
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@ -11429,7 +11429,8 @@ starttls_ldap_dialog() {
local -i ret=0
local msg_lenstr=""
local -i msg_len=0
local result=""
local buffer="" buffsize=""
local result_code="00"
local starttls_init=",
x30, x1d, x02, x01, # LDAP extendedReq
x01, # messageID: 1
@ -11438,33 +11439,57 @@ starttls_ldap_dialog() {
debugme echo "=== starting LDAP STARTTLS dialog ==="
socksend "${starttls_init}" 0 && debugme echo "${debugpad}initiated STARTTLS" &&
result=$(sockread_fast 256)
[[ $DEBUG -ge 4 ]] && safe_echo "$debugpad $result\n"
buffer=$(sockread_fast 256)
[[ $DEBUG -ge 4 ]] && safe_echo "$debugpad $buffer\n"
# response is typically 30 0c 02 01 01 78 07 0a 01 00 04 00 04 00
# ^^ 0 would be success in 9th byte
# We have two different scenarios: AD and OpenLDAP. And maybe more we don't more of yet.
# OpenLDAP-like reply is
# 30 0c 02 01 01 78 07 0a 01 00 04 00 04 00
# ^^ buffsize ^^ LDAP result code (0 -> success)
#
# see https://git.openldap.org/openldap/openldap/-/blob/master/include/ldap.h
# return values in https://www.rfc-editor.org/rfc/rfc2251#page-45 and e.g.
# https://git.openldap.org/openldap/openldap/-/blob/master/include/ldap.h
case "${result:18:2}" in
# AD-like is
# error: 30 84 00 00 00 7d 02 01 01 78 84 00 00 00 74 0a 01 34 04 00 04 55 30 30 [.. LdapErr, string, OID.. ]
# success 30 84 00 00 00 28 02 01 01 78 84 00 00 00 1F 0A 01 00 04 00 04 00 8A 16 [ .. OID .. ]
# ^^ buffsize ^^ LDAP result code (0 -> success)
# We assume that AD servers probably all have x84. It was deducted from a number of hosts.
# It maybe needs to be amended for other implementations.
# Basically using ldap_ExtendedResponse_parse() in apps/s_client.c of openssl would be
# more robust but it is kind of hard to understand.
#
# Bottom line: We'll look at the 9th or the 17th byte when retrieving the result code
# depending what the buffsize is.
buffsize="${buffer:2:2}"
case $buffsize in
0C) result_code="${buffer:18:2}" ;;
84) result_code="${buffer:34:2}" ;;
esac
[[ $DEBUG -ge 2 ]] && safe_echo "$debugpad buffsize: $buffsize / LDAP result code: $result_code \n"
case $result_code in
00) ret=0 ;;
# success
01) ret=1 ;;
# operationsError
# OpenLDAP: operationsError
02) ret=2
# protocolError (text msg: "unsupported extended operation") e.g. when STARTTLS not supported
# OpenLDAP: protocolError (text msg: "unsupported extended operation") e.g. when STARTTLS not supported
if [[ $DEBUG -ge 2 ]]; then
msg_lenstr=$(hex2dec ${result:26:02})
msg_lenstr=$(hex2dec ${buffer:26:02})
msg_len=$((2 * msg_lenstr))
safe_echo "$debugpad $(hex2binary "${result:28:$msg_len}")"
fi ;;
*)
ret=127
if [[ $DEBUG -ge 2 ]]; then
safe_echo "$debugpad $(hex2dec "${result:28:2}")"
safe_echo "$debugpad $(hex2binary "${buffer:28:$msg_len}")"
fi ;;
34) # This (52 in dec) seems to be the error code for AD when there's no STARTTLS
[[ $DEBUG -ge 2 ]] && safe_echo " seems AD server with no STARTTLS\n"
ret=52 ;;
*) [[ $DEBUG -ge 2 ]] && safe_echo "$debugpad $(hex2dec "${buffer:28:2}")"
ret=127 ;;
esac
debugme echo "=== finished LDAP STARTTLS dialog with ${ret} ==="
return $ret
}