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4ecc5461d3
This patch adds DKIM signing using https://github.com/driusan/dkim tools to the example hook. It also adds an optional integration test to exercise signing and verification, and corresponding documentation.
77 lines
2.1 KiB
Bash
Executable File
77 lines
2.1 KiB
Bash
Executable File
#!/bin/bash
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#
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# This file is an example post-data hook that will run standard filtering
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# utilities if they are available.
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#
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# - greylist (from greylistd) to do greylisting.
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# - spamc (from Spamassassin) to filter spam.
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# - clamdscan (from ClamAV) to filter virus.
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# - dkimsign (from driusan/dkim) to do DKIM signing.
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#
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# If it exits with code 20, it will be considered a permanent error.
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# Otherwise, temporary.
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set -e
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# Note greylistd needs you to add the user to the "greylist" group:
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# usermod -a -G greylist mail
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if [ "$AUTH_AS" == "" ] && [ "$SPF_PASS" == "0" ] && \
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command -v greylist >/dev/null && \
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groups | grep -q greylist;
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then
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REMOTE_IP=$(echo "$REMOTE_ADDR" | rev | cut -d : -f 2- | rev)
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if ! greylist update "$REMOTE_IP" "$MAIL_FROM" 1>&2; then
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echo "greylisted, please try again"
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exit 75 # temporary error
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fi
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echo "X-Greylist: pass"
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fi
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TF="$(mktemp --tmpdir post-data-XXXXXXXXXX)"
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trap 'rm "$TF"' EXIT
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# Save the message to the temporary file, so we can pass it on to the various
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# filters.
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cat > "$TF"
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if command -v spamc >/dev/null; then
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if ! SL=$(spamc -c - < "$TF") ; then
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echo "spam detected"
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exit 20 # permanent
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fi
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echo "X-Spam-Score: $SL"
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fi
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if command -v clamdscan >/dev/null; then
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if ! clamdscan --no-summary --infected - < "$TF" 1>&2 ; then
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echo "virus detected"
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exit 20 # permanent
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fi
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echo "X-Virus-Scanned: pass"
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fi
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# DKIM sign with https://github.com/driusan/dkim.
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#
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# Do it only if all the following are true:
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# - User has authenticated.
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# - dkimsign binary exists.
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# - domains/$DOMAIN/dkim_selector file exists.
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# - certs/$DOMAIN/dkim_privkey.pem file exists.
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#
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# Note this has not been thoroughly tested, so might need further adjustments.
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if [ "$AUTH_AS" != "" ] && command -v dkimsign; then
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DOMAIN=$( echo "$MAIL_FROM" | cut -d '@' -f 2 )
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if [ -f "domains/$DOMAIN/dkim_selector" ] \
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&& [ -f "certs/$DOMAIN/dkim_privkey.pem" ]; then
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dkimsign -n -hd \
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-key "certs/$DOMAIN/dkim_privkey.pem" \
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-s $(cat "domains/$DOMAIN/dkim_selector") \
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-d "$DOMAIN" \
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< "$TF"
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fi
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fi
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