LittleNellie/cipherscan
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don't calculate sha sums for the certificates over and over

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we can use cksum to calculate simple checksum much faster than
with using openssl, so we can compute sums only once
This commit is contained in:
Hubert Kario 2014-07-12 14:17:52 +02:00
parent 1eae0cc71b
commit 0f576c1fbc
1 changed files with 23 additions and 7 deletions
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cipherscan
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@ -48,6 +48,10 @@ TIMEOUT=30
# trust anchors are stored
CAPATH=""
SAVECRT=""
unset known_certs
declare -A known_certs
unset cert_checksums
declare -A cert_checksums
# because running external commands like sleep incurs a fork penalty, we
# first check if it is necessary
@ -184,15 +188,25 @@ test_cipher_on_target() {
for ((i=0; i<$certificate_count; i=i+1 )); do
# extract i'th certificate
local cert=$(awk -v i=$i 'split_after == 1 {n++;split_after=0}
/-----END CERTIFICATE-----/ {split_after=1}
{if (n == i) print }
' <<<"$tmp")
# clean up the cert from junk before BEGIN CERTIFICATE
cert=$(${OPENSSLBIN} x509 <<<"$cert" 2>/dev/null)
local cert=$(awk -v i=$i 'BEGIN { output=0;n=0 }
/-----BEGIN CERTIFICATE-----/ { output=1 }
output==1 { if (n==i) print }
/-----END CERTIFICATE-----/ { output=0; n++ }' <<<"$tmp")
# put the output to an array instead awk '{print $1}'
local cksum=($(cksum <<<"$cert"))
# compare the values not just checksums so that eventual collision
# doesn't mess up results
if [[ ${known_certs[$cksum]} == $cert ]]; then
if [ -n "${current_certificates}" ]; then
current_certificates+=","
fi
current_certificates+="\"${cert_checksums[$cksum]}\""
continue
fi
# compute sha256 fingerprint of the certificate
local sha256sum=$(${OPENSSLBIN} x509 -outform DER <<<"$cert" 2>/dev/null |\
local sha256sum=$(${OPENSSLBIN} x509 -outform DER\
<<<"$cert" 2>/dev/null |\
${OPENSSLBIN} dgst -sha256 -r 2>/dev/null| awk '{print $1}')
# check if it is a CA certificate
@ -238,6 +252,8 @@ test_cipher_on_target() {
current_certificates+=","
fi
current_certificates+="\"${sha256sum}\""
known_certs[$cksum]="$cert"
cert_checksums[$cksum]="$sha256sum"
done
debug "current_certificates: $current_certificates"