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Revert #1113

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This PR removes the changes that were added in #1113. As noted in the conversation for #1113, it was eventually determined that the actual bug was related to the first message fragment being too short rather than the overall length of the message. So, the warning message that is displayed by the code is misleading. In addition, if changes are made to avoid TCP fragmentation, then this code will no longer even test for intolerance to short message fragments.
This commit is contained in:
David Cooper 2018-09-25 14:16:00 -04:00 committed by GitHub
parent 305eefc9e8
commit 83a9302718
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1 changed files with 2 additions and 61 deletions
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testssl.sh
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@ -14532,12 +14532,12 @@ run_tls_truncation() {
run_grease() {
local -i success
local bug_found=false
local normal_hello_ok=false clienthello_size_bug=false
local normal_hello_ok=false
local cipher_list proto selected_cipher selected_cipher_hex="" extn rnd_bytes
local alpn_proto alpn alpn_list_len_hex extn_len_hex
local selected_alpn_protocol grease_selected_alpn_protocol
local ciph list temp curve_found
local -i i j rnd alpn_list_len extn_len base_len clienthello_len debug_level=""
local -i i j rnd alpn_list_len extn_len debug_level=""
local -i ret=0
# Note: The following values were taken from https://datatracker.ietf.org/doc/draft-ietf-tls-grease.
# These arrays may need to be updated if the values change in the final version of this document.
@ -14738,68 +14738,9 @@ run_grease() {
prln_svrty_medium " Server fails if ClientHello is between 256 and 511 bytes in length."
fileout "$jsonID" "MEDIUM" "Server fails if ClientHello is between 256 and 511 bytes in length."
bug_found=true
clienthello_size_bug=true
fi
fi
# Some servers fail if the length of the ClientHello is 522, 778, 1034, 1290, ... bytes.
# A few servers also fail if the length is 526, 782, 1038, 1294, ... bytes.
# So, send a number of ClientHello messages of extactly these lengths to see whether
# the connection fails.
if "$normal_hello_ok" && [[ "$proto" != "00" ]] && [[ ${#SNI} -le 92 ]]; then
if [[ "$proto" == "03" ]]; then
if [[ -z "$SNI" ]]; then
base_len=426
else
base_len=423+${#SNI}
fi
else
if [[ -z "$SNI" ]]; then
base_len=294
else
base_len=291+${#SNI}
fi
fi
for clienthello_len in 266 522 526 778 782 1034 1290 1546 1802 2058; do
if [[ $clienthello_len -eq 266 ]]; then
# If the server cannot handle ClientHello message lengths between
# 256 and 511, there is no need to test a ClientHello message of
# length 266.
"$clienthello_size_bug" && continue
# In order to create a message of length 266, need to send a message
# with fewer cipher suites, so the "true" base length of the messsage
# will be shorter.
extn_len=$((clienthello_len+250-base_len))
else
extn_len=$((clienthello_len-base_len))
fi
extn=""
for (( i=0; i < extn_len; i++ )); do
extn+=",00"
done
extn_len_hex=$(printf "%04x" $extn_len)
debugme echo -e "\nSending ClientHello with length $clienthello_len bytes"
if [[ $clienthello_len -eq 266 ]]; then
# Some extensions are only included if the ClientHello includes a TLS_ECDHE cipher suite.
# So, add one (either c0,01 or c0,02 in order to ensure that the message length will
# be correct.
if [[ "$selected_cipher_hex" == "C0,01" ]]; then
tls_sockets "$proto" "$selected_cipher_hex, c0,02, 00,ff" "" "00,15,${extn_len_hex:0:2},${extn_len_hex:2:2}${extn}"
else
tls_sockets "$proto" "$selected_cipher_hex, c0,01, 00,ff" "" "00,15,${extn_len_hex:0:2},${extn_len_hex:2:2}${extn}"
fi
else
tls_sockets "$proto" "$cipher_list" "" "00,15,${extn_len_hex:0:2},${extn_len_hex:2:2}${extn}"
fi
success=$?
if [[ $success -ne 0 ]] && [[ $success -ne 2 ]]; then
prln_svrty_medium " Server fails if ClientHello is $clienthello_len bytes in length."
fileout "$jsonID" "MEDIUM" "Server fails if ClientHello is $clienthello_len bytes in length."
bug_found=true
fi
done
fi
# Check that server ignores unrecognized cipher suite values
# see https://datatracker.ietf.org/doc/draft-ietf-tls-grease
if "$normal_hello_ok"; then