mirror of
https://blitiri.com.ar/repos/chasquid
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7e38a877e8
When running a diff for dkimpy's output, we expect that diff to exit with non-zero code. Unfortunately, the way we set that expectation (by prefixing the diff invocation with `!` is incorrect. Running `! diff ...` will not cause the hook to fail if diff exits with 0, instead `!` will cause the exit code to be ignored. This patch fixes the problem by running `diff ... && exit 1` instead. This was caught by shellcheck, https://www.shellcheck.net/wiki/SC2251.
124 lines
3.7 KiB
Bash
Executable File
124 lines
3.7 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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# - rspamc (from rspamd) or chasquid-rspamd to filter spam.
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# - clamdscan (from ClamAV) to filter virus.
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# - dkimsign (from driusan/dkim or dkimpy) 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: $SL"
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fi
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# Spam filter through rspamd.
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#
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# Use chasquid-rspamd (from https://github.com/Thor77/chasquid-rspamd) if
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# available, otherwise fall back to rspamc.
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if command -v chasquid-rspamd >/dev/null; then
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chasquid-rspamd < "$TF" 2>/dev/null
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elif command -v rspamc >/dev/null; then
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# Note the actions emitted by rspamc come from the thresholds
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# configured in /etc/rspamd/actions.conf.
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# The ones handled here are common defaults, but they might require
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# adjusting to match your rspamd configuration.
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# Note that greylisting is disabled in rspamc by design, so the
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# "greylist" action is ignored here to prevent false rejections.
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ACTION=$( rspamc < "$TF" 2>/dev/null | grep Action: | cut -d " " -f 2- )
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case "$ACTION" in
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reject)
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echo "spam detected"
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exit 20 # permanent error
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;;
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esac
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echo "X-Spam-Action:" "$ACTION"
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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 - < "$TF" 1>&2 ; then
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echo "virus detected"
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exit 20 # permanent
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fi
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echo "X-Virus-Scanned: pass"
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fi
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# DKIM sign with either driusan/dkim or dkimpy.
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#
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# Do it only if all the following are true:
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# - User has authenticated.
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# - dkimsign binary exists.
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# - domains/$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 >/dev/null; 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" ];
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then
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# driusan/dkim and dkimpy both provide the same binary (dkimsign) but
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# take different arguments, so we need to tell them apart.
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# This is awful but it should work reasonably well.
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if dkimsign --help 2>&1 | grep -q -- --identity; then
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# dkimpy
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dkimsign \
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"$(cat "domains/$DOMAIN/dkim_selector")" \
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"$DOMAIN" \
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"certs/$DOMAIN/dkim_privkey.pem" \
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< "$TF" > "$TF.dkimout"
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# dkimpy doesn't provide a way to just show the new
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# headers, so we have to compute the difference.
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# ALSOCHANGE(test/t-19-dkimpy/config/hooks/post-data)
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diff --changed-group-format='%>' \
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--unchanged-group-format='' \
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"$TF" "$TF.dkimout" && exit 1
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rm "$TF.dkimout"
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else
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# driusan/dkim
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dkimsign -n -hd \
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-key "certs/$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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fi
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