From f90caa452953aa14b05305dadcf254d289d73386 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Wed, 11 May 2022 00:22:05 +0200
Subject: [PATCH] use acls for attachemnt permissions, proper forking of
 background conversions

---
 attachment.sh | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/attachment.sh b/attachment.sh
index 89b90ae..43e70c5 100755
--- a/attachment.sh
+++ b/attachment.sh
@@ -39,7 +39,8 @@ attachment_convert(){
       res=$(ffprobe -show_entries stream=width "$attpath" 2>&-)
       res="${res#*width=}" res="${res%%${BR}*}"
       if [ "$res" -gt 1280 ]; then
-        ( ffmpeg -y -nostdin -i "$attpath" \
+        ( exec >&- 2>&1;
+          ffmpeg -y -nostdin -i "$attpath" \
           -c:v libvpx -vf scale=1280:-2 -crf 28 -b:v 0 \
           -c:a libvorbis -q:a 6 \
           "${cachepath%.*}.tmp.webm" \
@@ -47,7 +48,8 @@ attachment_convert(){
         & ) &
        
       else
-        ( ffmpeg -y -nostdin -i "$attpath" \
+        ( exec >&- 2>&1;
+          ffmpeg -y -nostdin -i "$attpath" \
           -c:v libvpx -crf 28 -b:v 0 \
           -c:a libvorbis -q:a 6 \
           "${cachepath%.*}.tmp.webm" \
@@ -62,7 +64,9 @@ attachment_convert(){
 
 if [ "${PATH_INFO%/\[attachment\]/}"  != "${PATH_INFO}" ]; then
   . "$_EXEC/multipart.sh"
-  if multipart_cache; then
+
+  if [ "${CONTENT_TYPE%%;*}" = "multipart/form-data" ] && acl_write "${PATH_INFO%\[attachment\]/}"; then
+    multipart_cache
     mkdir -p "$_DATA/pages/${PATH_INFO%/\[attachment\]/}/#attachments/"
     n=1; while filename=$(multipart_filename "file" "$n"); do
       filename="$(printf %s "$filename" |tr /\\0 __)"
@@ -71,13 +75,20 @@ if [ "${PATH_INFO%/\[attachment\]/}"  != "${PATH_INFO}" ]; then
     done
     rm -- "$multipart_cachefile"
     REDIRECT "${_BASE}${PATH_INFO}"
-  else
+  elif [ "${CONTENT_TYPE%%;*}" = "multipart/form-data" ]; then
+    theme_403
+  elif acl_read "${PATH_INFO%\[attachment\]/}"; then
     theme_attachments "${PATH_INFO%\[attachment\]/}"
+  else
+    theme_404
   fi
 
 elif [ "${PATH_INFO%/\[attachment\]/*}" != "${PATH_INFO}" ]; then
   attpath="${PATH_INFO%/\[attachment\]/*}/#attachments/${PATH_INFO##*/}"
-  if [ -f "$_DATA/pages/$attpath" ]; then
+
+  if ! acl_read "${PATH_INFO%/\[attachment\]/*}"; then
+    theme_403
+  elif [ -f "$_DATA/pages/$attpath" ]; then
     FILE "$_DATA/pages/$attpath"
   elif [ -f "$_EXEC/pages/$attpath" ]; then
     FILE "$_EXEC/pages/$attpath"
@@ -88,12 +99,17 @@ elif [ "${PATH_INFO%/\[attachment\]/*}" != "${PATH_INFO}" ]; then
   
 elif [ "${PATH_INFO%/}" = "${PATH_INFO}" ]; then
   attpath="${PATH_INFO%/*}/#attachments/${PATH_INFO##*/}"
-  if [ -f "$_DATA/pages/$attpath" ]; then
+
+  if ! acl_read "${PATH_INFO%/*}/"; then
+    theme_403
+  elif [ -f "$_DATA/pages/$attpath" ]; then
     FILE "$(attachment_convert "$_DATA/pages/$attpath")"
   elif [ -f "$_EXEC/pages/$attpath" ]; then
     FILE "$(attachment_convert "$_EXEC/pages/$attpath")"
   elif [ -d "$_DATA/pages/${PATH_INFO}" -o -d "$_EXEC/pages/${PATH_INFO}" ]; then
     REDIRECT "${_BASE}${PATH_INFO}/"
+  else
+    theme_404
   fi
   exit 0
 
-- 
2.39.2