diff options
| -rwxr-xr-x | ansible/roles/postfix/files/services/fortune-reply.sh | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/ansible/roles/postfix/files/services/fortune-reply.sh b/ansible/roles/postfix/files/services/fortune-reply.sh new file mode 100755 index 0000000..6dbfe9b --- /dev/null +++ b/ansible/roles/postfix/files/services/fortune-reply.sh @@ -0,0 +1,45 @@ +#!/bin/bash + +# Read the entire email into a variable +EMAIL=$(cat) + +# Extract the sender's email address +SENDER=$(echo "$EMAIL" | grep -i "^From:" | head -n 1 | sed -E 's/.*<([^>]+)>.*/\1/;t;s/^From:[[:space:]]*//') + +# Filter for invalid emails or attempted spoofs that were injected into the From header +if ! echo "$SENDER" | grep -qE '^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$'; then + echo "Attempted spoof detected, quitting." + exit 1 +fi + +# Extract the Message-ID of the original email +MESSAGE_ID=$(echo "$EMAIL" | grep -i "^Message-ID:" | head -n 1 | awk '{print $2}') + +# Extract the original Subject and prefix it with "Re: " if necessary +ORIGINAL_SUBJECT=$(echo "$EMAIL" | grep -i "^Subject:" | head -n 1 | sed -E 's/Subject: (Re: )?(.+)/\2/') + +# Construct the reply subject +REPLY_SUBJECT="Re: $ORIGINAL_SUBJECT" + +# Extract the To address +TO_ADDRESS=$(echo "$EMAIL" | grep -i "^To:" | sed -E 's/To: (.*)/\1/') + +# Generate the fortune output +if [[ "$TO_ADDRESS" =~ "fortune+cowsay" ]]; then + FORTUNE_OUTPUT=$(/usr/games/fortune | /usr/games/cowsay) +else + FORTUNE_OUTPUT=$(/usr/games/fortune) +fi + +# Send a reply with the proper headers +( + echo "Subject: $REPLY_SUBJECT" + echo "From: Fortunes by Python Discord <[email protected]>" + echo "To: $SENDER" + echo "In-Reply-To: $MESSAGE_ID" + echo "References: $MESSAGE_ID" + echo + echo "Here's your fortune:" + echo + echo "$FORTUNE_OUTPUT" +) | /usr/sbin/sendmail -t |