keytool importing multiple certificates in single file

Question

How to import multiple certificates in a single file with keytool [to cert store]?

keytool -importcert only imports the first one.

Answer 1

A bash script that will import all certificates from a PEM file:

#!/bin/bash
PEM_FILE=$1
PASSWORD=$2
KEYSTORE=$3
# number of certs in the PEM file
CERTS=$(grep 'END CERTIFICATE' $PEM_FILE| wc -l)

# For every cert in the PEM file, extract it and import into the JKS keystore
# awk command: step 1, if line is in the desired cert, print the line
#              step 2, increment counter when last line of cert is found
for N in $(seq 0 $(($CERTS - 1))); do
  ALIAS="${PEM_FILE%.*}-$N"
  cat $PEM_FILE |
    awk "n==$N { print }; /END CERTIFICATE/ { n++ }" |
    keytool -noprompt -import -trustcacerts \
            -alias $ALIAS -keystore $KEYSTORE -storepass $PASSWORD
done

For example:

./jks_import_pem TrustedCAs.PEM changeit truststore.jks