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Add logic for STARTTLS enabled AD servers

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There are two different scenarios. x0C is the buffsize reply from openldap-like servers
whereas AD servers probably have x84 and return also the OID. The following is kind of
hackish as ldap_ExtendedResponse_parse() in apps/s_client.c of openssl is kind of hard
to understand. It was deducted from a number of hosts.
Bottom line: We'll look at the 9th byte or at the 17th when retrieving the result code

AD:
30 84 00 00 00 7d 02 01 01 78 84 00 00 00 74 0a 01 34 04 00 04 55 30 30 30 30 30 30 30 30 3a 20 [ failed AD .. LdapErr + OID..]
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 ..]
   ^^ bufflen                                      ^^ resultcode

30 0C 02 01 01 78 07 0A 01 00 04 00 04 00
   ^^ bufflen              ^^ result code
This commit is contained in:
Dirk Wetter
2023-01-17 11:16:05 +01:00
parent c67cefaf8e
commit fc2a020294
1 changed files with 25 additions and 11 deletions
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36
testssl.sh
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@@ -11429,7 +11429,7 @@ starttls_ldap_dialog() {
local -i ret=0
local msg_lenstr=""
local -i msg_len=0
local result=""
local result="" buffsize=""
local starttls_init=",
x30, x1d, x02, x01, # LDAP extendedReq
x01, # messageID: 1
@@ -11441,13 +11441,26 @@ starttls_ldap_dialog() {
result=$(sockread_fast 256)
[[ $DEBUG -ge 4 ]] && safe_echo "$debugpad $result\n"
# response is typically 30 0c 02 01 01 78 07 0a 01 00 04 00 04 00
# ^^ 0 would be success in 9th byte
#
# For ~ OpenLDAP: response is typically 30 0c 02 01 01 78 07 0a 01 00 04 00 04 00
# ^^ buffsize ^^ ret value (0 -> success)
# see https://git.openldap.org/openldap/openldap/-/blob/master/include/ldap.h
# return values in https://www.rfc-editor.org/rfc/rfc2251#page-45 and e.g.
# https://git.openldap.org/openldap/openldap/-/blob/master/include/ldap.h
case "${result:18:2}" in
# We have two different scenarios though. x0C is the buffsize reply from openldap-like servers
# whereas AD servers probably have x84 and return also the OID. The following is kind of
# hackish as ldap_ExtendedResponse_parse() in apps/s_client.c of openssl is kind of hard
# to understand. It was deducted from a number of hosts.
# Bottom line: We'll look at the 9th byte or at the 17th when retrieving the result code
buffsize="${result:2:2}"
case $buffsize in
0C) result_code="${result:18:2}" ;;
84) result_code="${result:34:2}" ;;
esac
[[ $DEBUG -ge 2 ]] && safe_echo "$debugpad buffsize: $buffsize / LDAP result_code: $result_code \n"
case $result_code in
00) ret=0 ;;
# success
01) ret=1 ;;
@@ -11459,12 +11472,13 @@ starttls_ldap_dialog() {
msg_len=$((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}")"
fi ;;
34) [[ $DEBUG -ge 2 ]] && safe_echo " seems AD server with no STARTTLS\n"
ret=52 ;;
*) [[ $DEBUG -ge 2 ]] && safe_echo "$debugpad $(hex2dec "${result:28:2}")"
ret=127 ;;
esac
debugme echo "=== finished LDAP STARTTLS dialog with ${ret} ==="
return $ret
}