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212 lines
9.2 KiB
212 lines
9.2 KiB
#!/bin/sh
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##########################################################################
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# Copyright KAZ 2021 #
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# #
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# contact (at) kaz.bzh #
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# #
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# This software is a filter to shrink email by attachment extraction. #
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# #
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# This software is governed by the CeCILL-B license under French law and #
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# abiding by the rules of distribution of free software. You can use, #
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# modify and/or redistribute the software under the terms of the #
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# CeCILL-B license as circulated by CEA, CNRS and INRIA at the following #
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# URL "http://www.cecill.info". #
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# #
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# As a counterpart to the access to the source code and rights to copy, #
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# modify and redistribute granted by the license, users are provided #
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# only with a limited warranty and the software's author, the holder of #
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# the economic rights, and the successive licensors have only limited #
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# liability. #
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# #
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# In this respect, the user's attention is drawn to the risks associated #
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# with loading, using, modifying and/or developing or reproducing the #
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# software by the user in light of its specific status of free software, #
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# that may mean that it is complicated to manipulate, and that also #
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# therefore means that it is reserved for developers and experienced #
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# professionals having in-depth computer knowledge. Users are therefore #
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# encouraged to load and test the software's suitability as regards #
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# their requirements in conditions enabling the security of their #
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# systems and/or data to be ensured and, more generally, to use and #
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# operate it in the same conditions as regards security. #
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# #
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# The fact that you are presently reading this means that you have had #
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# knowledge of the CeCILL-B license and that you accept its terms. #
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##########################################################################
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##########################################################################
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# - installer l' utilitaire apg pour génération de mot de passes
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# - le contenu de INSPECT_DIR doit être accessible en écriture pour le
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# proriétaire du script
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# - shrinkEMail et jirafeau.sh doivent être accessible en execution pour
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# le roriétaire du script
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##########################################################################
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cd $(dirname $0)
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DOMAINNAME=$(cat domainname)
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# Exit codes from <sysexits.h>
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EX_TEMPFAIL=75
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EX_UNAVAILABLE=69
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EX_TOO_LARGE=552
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INSPECT_DIR=/var/spool/filter
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FIC_LOG=/var/log/mail/filter.log
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SENDMAIL="/usr/sbin/sendmail -G -i"
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MAILS=/tmp/FILTER
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MAX_KEEP_IN_MAIL=5ki
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MAX_UPLOAD_SIZE=100Mi
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SHRINK_CMD=/home/filter/eMailShrinker
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JIRAFEAU_CMD=/home/filter/jirafeauAPI
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JIRAFEAU_URL=https://depot.${DOMAINNAME:-"kaz.bzh"}
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JIRAFEAU_LOCAL=http://depot
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JIRAFEAU_TIME=month
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MD5_CMD=/usr/bin/md5sum
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DISCLAMER_CMD=altermime
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MAX_FINAL_SIZE=204800 # 200ki
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#################### FONCTIONS ############################################
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#--------------------- Fichier de LOG -------------------
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LOG_FIC() {
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echo "$(date +%d-%m-%Y-%H-%M-%S) : $*" >> "${FIC_LOG}"
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}
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#################### MAIN #################################################
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LOG_FIC "------------------------------------------------------"
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LOG_FIC "--------------- debut de programme -------------------"
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mkdir -p "${MAILS}" || { LOG_FIC "impossible de creer ce dossier"; exit "${EX_UNAVAILABLE}"; }
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MAIL_SOURCE=$(echo $@ | awk 'BEGIN{FS=" "} {print $2}')
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DATE_TEMPS=$(date "+%Y-%m-%d-%H:%M:%S")
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REP_PIECE_JOINTE=$(echo "${MAILS}/${DATE_TEMPS}_${MAIL_SOURCE}_$$")
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cd "${INSPECT_DIR}" || { echo "${INSPECT_DIR} does not exist"; exit "${EX_TEMPFAIL}"; }
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# lien renvoyé par le téléverssement
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ONE_LINK="${REP_PIECE_JOINTE}/one.txt"
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# anciens liens à réactiver
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OLD_LINKS="${REP_PIECE_JOINTE}/url-to-refresh.txt"
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# contenu de l'archive
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ARCHIVE_CONTENT="${REP_PIECE_JOINTE}/archive-content.txt"
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# Clean up when done or when aborting.
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trap "rm -rf in.$$ in.$$.altered ${REP_PIECE_JOINTE}" 0 1 2 3 15
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cat > "in.$$" || { LOG_FIC "Cannot save mail to file"; exit "${EX_TEMPFAIL}"; }
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# XXX trace
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# cp "${INSPECT_DIR}/in.$$" "${INSPECT_DIR}/in.$$.bak"
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mkdir -p "${REP_PIECE_JOINTE}/"
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>"${OLD_LINKS}"
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>"${ARCHIVE_CONTENT}"
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# Etape de rafraichissement des anciens fichiers inclus
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cat > "${ARCHIVE_CONTENT}" <<EOF
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src: ${MAIL_SOURCE}
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time: ${DATE_TEMPS}
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EOF
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LOG_FIC "${SHRINK_CMD} -u \"${INSPECT_DIR}/in.$$\" 2>> \"${FIC_LOG}\" > \"${OLD_LINKS}\""
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"${SHRINK_CMD}" -u "${INSPECT_DIR}/in.$$" 2>> "${FIC_LOG}" > "${OLD_LINKS}"
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cat "${OLD_LINKS}" | grep "${JIRAFEAU_URL}" | while read REMOTE_LINK
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do
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REMOTE_REF=$(echo "${REMOTE_LINK}" | sed -e 's/.*h=\([^&]*\).*/\1/' -e 's/.*http.*//')
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[ -z "${REMOTE_REF}" ] && continue
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REMOTE_KEY=$(echo "${REMOTE_LINK}" | grep "k=" | sed 's%.*k=\([^&]*\).*%\1%')
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# update periode for download
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LOG_FIC " - \"${JIRAFEAU_CMD}\" -f \"${JIRAFEAU_LOCAL}\" -t \"${JIRAFEAU_TIME}\" update \"${REMOTE_REF}\" 2>&1 >> \"${FIC_LOG}\""
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"${JIRAFEAU_CMD}" -f "${JIRAFEAU_LOCAL}" -t "${JIRAFEAU_TIME}" update "${REMOTE_REF}" 2>&1 >> "${FIC_LOG}"
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echo "old: ${REMOTE_REF} ${REMOTE_KEY}" >> "${ARCHIVE_CONTENT}"
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done
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LOG_FIC " - archive starts with: $(cat ${ARCHIVE_CONTENT})"
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# Etape extraction des pieces jointes
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LOG_FIC "${SHRINK_CMD} -s ${MAX_KEEP_IN_MAIL} -d ${REP_PIECE_JOINTE} ${INSPECT_DIR}/in.$$"
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"${SHRINK_CMD}" -s "${MAX_KEEP_IN_MAIL}" -d "${REP_PIECE_JOINTE}" "${INSPECT_DIR}/in.$$" 2>> "${FIC_LOG}" | {
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while read ATTACH_TMP_NAME
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do
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if [ -d "${ATTACH_TMP_NAME}" ]
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then
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ATTACH_MEDIA="${ATTACH_TMP_NAME}/media"
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ATTACH_NAME=$(grep "^Name: " "${ATTACH_TMP_NAME}/meta" | cut -c 7- )
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ATTACH_CONTENT_TYPE=$(grep "^Content-Type: " "${ATTACH_TMP_NAME}/meta" | cut -c 15- )
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else
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# XXX error
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continue
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fi
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# Etape de televersement des pieces jointes
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PASSWORD=$(apg -n 1 -m 12)
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PASSWORD_MD5=$(echo -n ${PASSWORD} | ${MD5_CMD} | cut -d \ -f 1)
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LOG_FIC " - \"${JIRAFEAU_CMD}\" -f \"${JIRAFEAU_LOCAL}\" -s \"${MAX_UPLOAD_SIZE}\" -c \"${ATTACH_CONTENT_TYPE}\" -n \"${ATTACH_NAME}\" send \"${ATTACH_MEDIA}\" \"${PASSWORD}\" 2>> \"${FIC_LOG}\" > \"${ONE_LINK}\""
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"${JIRAFEAU_CMD}" -f "${JIRAFEAU_LOCAL}" -s "${MAX_UPLOAD_SIZE}" -c "${ATTACH_CONTENT_TYPE}" -n "${ATTACH_NAME}" send "${ATTACH_MEDIA}" "${PASSWORD}" 2>> "${FIC_LOG}" > "${ONE_LINK}"
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cat "${ONE_LINK}" | {
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read JIR_TOKEN
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read JIR_CODE
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LOG_FIC " - Jirafeau retourne ${JIR_TOKEN} et ${JIR_CODE}"
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case "${JIR_TOKEN}" in
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"" | no | *Error* | \<* )
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LOG_FIC " - impossible de televerser ${ATTACH_TMP_FILE} (${JIR_TOKEN}), il ne sera pas remplace dans le message"
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echo "new:"
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;;
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* )
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LOG_FIC " - substitution par ${JIRAFEAU_URL}/f.php?d=1&h=${JIR_TOKEN}&k=${PASSWORD_MD5}"
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echo "url: ${JIRAFEAU_URL}/f.php?d=1&h=${JIR_TOKEN}&k=${PASSWORD_MD5}"
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echo "new: ${JIR_TOKEN} ${PASSWORD_MD5}" >> "${ARCHIVE_CONTENT}"
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;;
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esac
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}
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LOG_FIC " - supprimer l'extraction ${ATTACH_TMP_FILE}"
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rm -f "${ATTACH_TMP_FILE}"
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done
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# Création de l'archive
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if [ "$(wc -l < "${ARCHIVE_CONTENT}")" -ge 4 ]; then
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PASSWORD=$(apg -n 1 -m 12)
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PASSWORD_MD5=$(echo -n ${PASSWORD} | ${MD5_CMD} | cut -d \ -f 1)
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LOG_FIC " - \"${JIRAFEAU_CMD}\" -f \"${JIRAFEAU_LOCAL}\" -s \"${MAX_UPLOAD_SIZE}\" -c \"text/plain\" -n \"archive_content\" send \"${ARCHIVE_CONTENT}\" \"${PASSWORD}\" 2>> \"${FIC_LOG}\" > \"${ONE_LINK}\""
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"${JIRAFEAU_CMD}" -f "${JIRAFEAU_LOCAL}" -s "${MAX_UPLOAD_SIZE}" -c "text/plain" -n "archive_content" send "${ARCHIVE_CONTENT}" "${PASSWORD}" 2>> "${FIC_LOG}" > "${ONE_LINK}"
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cat "${ONE_LINK}" | {
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read JIR_TOKEN
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read JIR_CODE
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LOG_FIC " - Jirafeau retourne ${JIR_TOKEN} et ${JIR_CODE}"
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case "${JIR_TOKEN}" in
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"" | no | *Error* | \<* )
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LOG_FIC " - impossible de televerser l'archive (${JIR_TOKEN}), il ne sera pas remplace dans le message"
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echo "arch: bad"
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;;
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* )
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LOG_FIC " - ajoute de l'archive ${JIRAFEAU_URL}/a.php?g=${JIR_TOKEN}~${PASSWORD_MD5}"
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echo "arch: ${JIRAFEAU_URL}/a.php?g=${JIR_TOKEN}~${PASSWORD_MD5}"
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;;
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esac
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}
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else
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LOG_FIC " - pas d'archive (moins de 2 PJ)"
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echo "arch: none"
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fi
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# Etape de substitution
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LOG_FIC "${SHRINK_CMD} -s \"${MAX_KEEP_IN_MAIL}\" \"${INSPECT_DIR}/in.$$\" \"${INSPECT_DIR}/in.$$.altered\" 2>> \"${FIC_LOG}\""
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} | "${SHRINK_CMD}" -s "${MAX_KEEP_IN_MAIL}" "${INSPECT_DIR}/in.$$" "${INSPECT_DIR}/in.$$.altered" 2>> "${FIC_LOG}"
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# XXX trace
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# cp "${INSPECT_DIR}/in.$$" "${INSPECT_DIR}/in.$$.altered" /var/mail/tmp/
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# Etape choix de modification du message d'origine
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if [ "$(wc -l < "${ARCHIVE_CONTENT}")" -ge 3 ]; then
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# verification de taille finale
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actualSize=$(wc -c < "${INSPECT_DIR}/in.$$.altered")
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if [ ${actualSize} -ge $MAX_FINAL_SIZE ]; then
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LOG_FIC " - message trop gros apres regime ${INSPECT_DIR}/in.$$.altered (${actualSize})"
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exit "${EX_TOO_LARGE}";
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fi
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LOG_FIC " - envoi de la commande : ${SENDMAIL} $@ ${INSPECT_DIR}/in.$$.altered"
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${SENDMAIL} "$@" < "${INSPECT_DIR}/in.$$.altered"
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else
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# verification de taille finale
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actualSize=$(wc -c < "${INSPECT_DIR}/in.$$")
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if [ ${actualSize} -ge $MAX_FINAL_SIZE ]; then
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LOG_FIC " - message trop gros sans regime ${INSPECT_DIR}/in.$$ (${actualSize})"
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exit "${EX_TOO_LARGE}";
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fi
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LOG_FIC " - pas de piece jointe"
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${SENDMAIL} "$@" < "in.$$"
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fi
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exit 0
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##########################################################################
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