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267 lines
11 KiB
267 lines
11 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=1Gi
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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.${DOMAINNAME:-"kaz.bzh"}
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JIRAFEAU_LOCAL=http://depot
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JIRAFEAU_TIME=month
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MD5_CMD=/usr/bin/md5sum
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DISCLAMER_CMD=altermime
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MAX_FINAL_SIZE=204800 # 200ki
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ARCHIVE_TITLE="archive_content"
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ARCHIVE_MIME="text/kaz_email_archive"
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#################### FONCTIONS ############################################
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BOLD='[1m'
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RED='[0;31m'
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GREEN='[0;32m'
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YELLOW='[0;33m'
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BLUE='[0;34m'
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MAGENTA='[0;35m'
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CYAN='[0;36m'
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NC='[0m' # No Color
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NL='
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'
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#--------------------- Fichier de LOG -------------------
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LOG_FIC() {
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echo "${BLUE}$(date +%d-%m-%Y-%H-%M-%S)${NC} : $*" >> "${FIC_LOG}"
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}
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quitFilter () {
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LOG_FIC "${GREEN}######################################## filter stop${NC}"
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exit $1
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}
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#################### MAIN #################################################
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echo "${NL}" >> "${FIC_LOG}"
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LOG_FIC "${GREEN}######################################## filter start${NC}"
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if ! mkdir -p "${MAILS}"; then
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LOG_FIC "${RED}Can't mkdir ${MAILS} ${NC}"
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quitFilter "${EX_UNAVAILABLE}"
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fi
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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="${MAILS}/${DATE_TEMPS}_${MAIL_SOURCE}_$$"
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TRACK=$(curl "${JIRAFEAU_LOCAL}/a.php?r=${MAIL_SOURCE}" 2>/dev/null)
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PERIOD=$(curl "${JIRAFEAU_LOCAL}/a.php?p=${MAIL_SOURCE}" 2>/dev/null)
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if [ -n "$(echo "${PERIOD}" | grep -e minute -e hour -e day -e week -e month -e quarter 2>/dev/null)" ]; then
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JIRAFEAU_TIME="${PERIOD}"
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fi
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LOG_FIC "\n" \
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" MAIL_SOURCE : ${YELLOW}${MAIL_SOURCE}${NC}\n" \
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" DATE_TEMPS : ${YELLOW}${DATE_TEMPS=}${NC}\n" \
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" TRACK : ${YELLOW}${TRACK}${NC}\n" \
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" PERIOD : ${YELLOW}${PERIOD}${NC}\n" \
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" JIRAFEAU_TIME: ${YELLOW}${JIRAFEAU_TIME}${NC}"
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if ! cd "${INSPECT_DIR}"; then
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echo "${INSPECT_DIR} does not exist"
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quitFilter "${EX_TEMPFAIL}"
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fi
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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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# create if error
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JIRAFEAU_ERROR="${REP_PIECE_JOINTE}/jirafeau-error.txt"
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# Clean up when done or when aborting.
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trap "rm -rf in.$$ in.$$.altered ${REP_PIECE_JOINTE}" 0 1 2 3 15
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if ! cat > "in.$$"; then
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LOG_FIC "${RED}Cannot save mail to file${NC}"
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quitFilter "${EX_TEMPFAIL}"
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fi
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LOG_FIC "\n" \
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" size: ${YELLOW}$(wc -c < "${INSPECT_DIR}/in.$$")${NC}"
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# XXX trace
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# cp "${INSPECT_DIR}/in.$$" "${INSPECT_DIR}/in.$$.bak"
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mkdir -p "${REP_PIECE_JOINTE}/"
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>"${OLD_LINKS}"
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>"${ARCHIVE_CONTENT}"
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# Etape de rafraichissement des anciens fichiers inclus
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echo "time: ${DATE_TEMPS}\nid: $(date +%s)" > "${ARCHIVE_CONTENT}"
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[ -n "${TRACK}" ] && echo "sender: ${MAIL_SOURCE}" >> "${ARCHIVE_CONTENT}"
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LOG_FIC "${CYAN}${SHRINK_CMD} -u \"${INSPECT_DIR}/in.$$\" 2>> \"${FIC_LOG}\" > \"${OLD_LINKS}\"${NC}"
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"${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 " - ${CYAN}\"${JIRAFEAU_CMD}\" -f \"${JIRAFEAU_LOCAL}\" -t \"${JIRAFEAU_TIME}\" update \"${REMOTE_REF}\" 2>&1 >> \"${FIC_LOG}\"${NC}"
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"${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: ${NL}${YELLOW}$(cat ${ARCHIVE_CONTENT})${NC}"
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# Etape extraction des pieces jointes
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LOG_FIC "${CYAN}${SHRINK_CMD} -s ${MAX_KEEP_IN_MAIL} -d ${REP_PIECE_JOINTE} ${INSPECT_DIR}/in.$$ ${NC}"
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"${SHRINK_CMD}" -s "${MAX_KEEP_IN_MAIL}" -d "${REP_PIECE_JOINTE}" "${INSPECT_DIR}/in.$$" 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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LOG_FIC " - ${RED}no ATTACH_TMP_NAME (${ATTACH_TMP_NAME}) ${NC}"
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# XXX error
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continue
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fi
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# Etape de televersement des pieces jointes
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PASSWORD=$(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 " - ${CYAN}\"${JIRAFEAU_CMD}\" -f \"${JIRAFEAU_LOCAL}\" -t \"${JIRAFEAU_TIME}\" -s \"${MAX_UPLOAD_SIZE}\" -c \"${ATTACH_CONTENT_TYPE}\" -n \"${ATTACH_NAME}\" send \"${ATTACH_MEDIA}\" \"${PASSWORD}\" 2>> \"${FIC_LOG}\" > \"${ONE_LINK}\"${NC}"
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"${JIRAFEAU_CMD}" -f "${JIRAFEAU_LOCAL}" -t "${JIRAFEAU_TIME}" -s "${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 " - return code ${YELLOW}${JIR_TOKEN}${NC} / ${YELLOW}${JIR_CODE}${NC}"
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case "${JIR_TOKEN}" in
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"" | no | *Error* | \<* )
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LOG_FIC " - ${RED}Can't upload <${ATTACH_NAME}> <${ATTACH_CONTENT_TYPE}> <$(wc -c < "${ATTACH_MEDIA}")> (${JIR_TOKEN}) <in.$$.bak>. It will be not change in e-mail.${NC}"
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echo "new:"
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cp "${INSPECT_DIR}/in.$$" "${INSPECT_DIR}/in.$$.bak"
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echo "UPLOAD_FAIL" >> "${JIRAFEAU_ERROR}"
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;;
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* )
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LOG_FIC " - change by link ${YELLOW}${JIRAFEAU_URL}/f.php?d=1&h=${JIR_TOKEN}&k=${PASSWORD_MD5}${NC}"
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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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done
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# Création de l'archive
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NB_ATTACH=$(grep -e "^old: " -e "^new: " "${ARCHIVE_CONTENT}" | wc -l)
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if [ \( -n "${TRACK}" -a "${NB_ATTACH}" -gt 0 \) -o "${NB_ATTACH}" -gt 1 ]; then
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PASSWORD=$(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 " - ${MAGENTA}upload archive${NC}"
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LOG_FIC " - ${CYAN}\"${JIRAFEAU_CMD}\" -f \"${JIRAFEAU_LOCAL}\" -t \"${JIRAFEAU_TIME}\" -s \"${MAX_UPLOAD_SIZE}\" -c \"${ARCHIVE_MIME}\" -n \"${ARCHIVE_TITLE}\" send \"${ARCHIVE_CONTENT}\" \"${PASSWORD}\" 2>> \"${FIC_LOG}\" > \"${ONE_LINK}\"${NC}"
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"${JIRAFEAU_CMD}" -f "${JIRAFEAU_LOCAL}" -t "${JIRAFEAU_TIME}" -s "${MAX_UPLOAD_SIZE}" -c "${ARCHIVE_MIME}" -n "${ARCHIVE_TITLE}" send "${ARCHIVE_CONTENT}" "${PASSWORD}" 2>> "${FIC_LOG}" > "${ONE_LINK}"
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fi
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LOG_FIC " - final archive content: ${NL}${YELLOW}$(cat ${ARCHIVE_CONTENT})${NC}"
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if [ "${NB_ATTACH}" -gt 1 ]; then
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cat "${ONE_LINK}" | {
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read JIR_TOKEN
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read JIR_CODE
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LOG_FIC " - return code ${YELLOW}${JIR_TOKEN}${NC} / ${YELLOW}${JIR_CODE}${NC}"
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case "${JIR_TOKEN}" in
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"" | no | *Error* | \<* )
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LOG_FIC " - ${RED}can't upload archive (${JIR_TOKEN}) <in.$$.bak>, substitution couldn't be done${NC}"
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echo "arch: bad"
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cp "${INSPECT_DIR}/in.$$" "${INSPECT_DIR}/in.$$.bak"
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echo "ARCHIVE_FAIL" >> "${JIRAFEAU_ERROR}"
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;;
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* )
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LOG_FIC " - add archive ${YELLOW}${JIRAFEAU_URL}/a.php?g=${JIR_TOKEN}~${PASSWORD_MD5}${NC}"
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echo "arch: ${JIRAFEAU_URL}/a.php?g=${JIR_TOKEN}~${PASSWORD_MD5}"
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;;
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esac
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}
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else
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LOG_FIC " - no archive (less than 2 attach file)"
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echo "arch: none"
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fi
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# Etape de substitution
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LOG_FIC "${CYAN}${SHRINK_CMD} -s \"${MAX_KEEP_IN_MAIL}\" \"${INSPECT_DIR}/in.$$\" \"${INSPECT_DIR}/in.$$.altered\" 2>> \"${FIC_LOG}\"${NC}"
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} | "${SHRINK_CMD}" -s "${MAX_KEEP_IN_MAIL}" "${INSPECT_DIR}/in.$$" "${INSPECT_DIR}/in.$$.altered" 2>> "${FIC_LOG}"
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# XXX trace
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# cp "${INSPECT_DIR}/in.$$" "${INSPECT_DIR}/in.$$.altered" /var/mail/tmp/
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if [ -s "${JIRAFEAU_ERROR}" ]; then
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LOG_FIC " - ${RED}upload fail${NC}"
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quitFilter "${EX_TEMPFAIL}"
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fi
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# Etape choix de modification du message d'origine
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if [ "$(wc -l < "${ARCHIVE_CONTENT}")" -ge 3 ]; then
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# verification de taille finale
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actualSize=$(wc -c < "${INSPECT_DIR}/in.$$.altered")
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if [ ${actualSize} -ge $MAX_FINAL_SIZE ]; then
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LOG_FIC " - ${RED}too big even after diet ${INSPECT_DIR}/in.$$.altered (${actualSize})${NC}"
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quitFilter "${EX_TOO_LARGE}"
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fi
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LOG_FIC " - ${GREEN}send with : ${SENDMAIL} $@ ${INSPECT_DIR}/in.$$.altered ${NC}"
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${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 " - ${RED}too big without diet ${INSPECT_DIR}/in.$$ (${actualSize}) ${NC}"
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quitFilter "${EX_TOO_LARGE}"
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fi
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LOG_FIC " - ${GREEN}send without attach file${NC}"
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${SENDMAIL} "$@" < "in.$$"
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fi
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quitFilter 0
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##########################################################################
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