72 lines
2.3 KiB
Bash
Executable File
72 lines
2.3 KiB
Bash
Executable File
#!/bin/sh
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CERT_PEM="$1" # input (cert.pem)
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CHAIN_PEM="$2" # input (chain.pem)
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OCSP_DER="$3" # output symlink (staple.der)
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OCSP_TMP="" # temporary file
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if [[ -z "$CERT_PEM" ]] || [[ -z "$CHAIN_PEM" ]] || [[ -z "$OCSP_DER" ]] \
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|| [[ ! -f "$CERT_PEM" ]] || [[ ! -f "$CHAIN_PEM" ]]; then
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echo 1>&2 "usage: cert-staple.sh cert.pem chain.pem staple.der"
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exit 1
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fi
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function errexit {
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[[ -n "$OCSP_TMP" ]] && rm -f "$OCSP_TMP"
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exit 1
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}
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# get URI of OCSP responder from certificate
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OCSP_URI=$(openssl x509 -in "$CERT_PEM" -ocsp_uri -noout)
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[[ $? = 0 ]] && [[ -n "$OCSP_URI" ]] || exit 1
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# exception for (unsupported, end-of-life) older versions of OpenSSL
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OCSP_HOST=
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OPENSSL_VERSION=$(openssl version)
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if [[ "${OPENSSL_VERSION}" != "${OPENSSL_VERSION#OpenSSL 1.0.}" ]]; then
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# get authority from URI
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OCSP_HOST=$(echo "$OCSP_URI" | cut -d/ -f3)
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fi
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# get OCSP response from OCSP responder
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OCSP_TMP="$OCSP_DER.$$"
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OCSP_RESP=$(openssl ocsp -issuer "$CHAIN_PEM" -cert "$CERT_PEM" -respout "$OCSP_TMP" -noverify -no_nonce -url "$OCSP_URI" ${OCSP_HOST:+-header Host "$OCSP_HOST"})
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[[ $? = 0 ]] || errexit
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# parse OCSP response from OCSP responder
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#
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#$CERT_PEM: good
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# This Update: Jun 5 21:00:00 2020 GMT
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# Next Update: Jun 12 21:00:00 2020 GMT
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ocsp_status="$(printf %s "$OCSP_RESP" | head -1)"
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[[ "$ocsp_status" = "$CERT_PEM: good" ]] || errexit
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next_update="$(printf %s "$OCSP_RESP" | grep 'Next Update:')"
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next_date="$(printf %s "$next_update" | sed 's/.*Next Update: //')"
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[[ -n "$next_date" ]] || errexit
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ocsp_expire=$(date -d "$next_date" +%s)
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# validate OCSP response
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ocsp_verify=$(openssl ocsp -issuer "$CHAIN_PEM" -verify_other "$CHAIN_PEM" -cert "$CERT_PEM" -respin "$OCSP_TMP" -no_nonce -out /dev/null 2>&1)
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[[ "$ocsp_verify" = "Response verify OK" ]] || errexit
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# rename and update symlink to install OCSP response to be used in OCSP stapling
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OCSP_OUT="$OCSP_DER.$ocsp_expire"
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mv "$OCSP_TMP" "$OCSP_OUT" || errexit
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OCSP_TMP=""
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ln -sf "${OCSP_OUT##*/}" "$OCSP_DER" || errexit
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# debug: display text output of OCSP .der file
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#openssl ocsp -respin "$OCSP_DER" -resp_text -noverify
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# remove old OCSP responses which have expired
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now=$(date +%s)
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for i in "$OCSP_DER".*; do
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ts="${i#${OCSP_DER}.}"
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if [[ -n "$ts" ]] && [[ "$ts" -lt "$now" ]]; then
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rm -f "$i"
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fi
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done
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