Arch Linux

WangYilin

Member

From: Beijing

Registered: 2016-12-15

Posts: 8

when mounting a folder from a prooted jail, permission denied

Hello everyone!

What could be the cause of the following error?

ip.of.my.phone:path/to/my/shared/folder: Permission denied

Where could I find the log for sshfs?

This error appeared when I tried to mount a folder from a prooted jail.

First, I run the following script in termux to start sshd in a prooted jail from my android phone (not rooted).

     1 #!/bin/bash
     2 export JailDir="$HOME/proot-fs"
     3 export FTPFiles="path/to/my/shared/folder"
     4 export ff="/data/data/com.termux/files"
     5
     6 [ -d $JailDir$ff/home ] || mkdir -p $JailDir/data/data/com.termux/files/home
     7 [ -d $JailDir$ff/home/FTPFiles ] || mkdir -p $JailDir/data/data/com.termux/files/home/FTPFiles
     8 [ -d $JailDir$ff/home/.ssh ] || mkdir -p $JailDir$ff/home/.ssh
     9 [ -f $JailDir$ff/home/.ssh/authorized_keys ] || cp $HOME/.ssh/authorized_keys $JailDir$ff/home/.ssh/authorized_keys
    10 [ -d $JailDir/home/bin ] || mkdir -p $JailDir/home/bin
    11 #generating .ssh/sshd_config
    12 cat > $JailDir$ff/home/.ssh/sshd_config <<-_EOF_
    13         PrintMotd no
    14         PasswordAuthentication yes
    15         #AuthorizedKeysFile /home/.ssh/authorized_keys
    16         PubkeyAcceptedKeyTypes +ssh-dss
    17         Subsystem sftp /data/data/com.termux/files/usr/libexec/sftp-server
    18         ListenAddress ip.of.my.phone
    19 _EOF_
    20 unset LD_PRELOAD
    21 export LD_PRELOAD=$PREFIX/lib/libtermux-exec.so
    22 ARGS="-r $JailDir"
    23 #ARGS="$ARGS -b /system/bin"
    24 #ARGS="$ARGS -b /system/lib64"
    25 ARGS="$ARGS -b /system"
    26 ARGS="$ARGS -b /etc"
    27 ARGS="$ARGS -b /dev"
    28 ARGS="$ARGS -b /sys"
    29 ARGS="$ARGS -b /proc"
    30 ARGS="$ARGS -b $PREFIX"
    31 ARGS="$ARGS -b $FTPFiles"
    32 case $1 in
    33   off) PROGRAM="pkill sshd"
    34   ;;
    35   *) cat $JailDir$ff/home/.ssh/sshd_config | grep ListenAddress
    36   PROGRAM="sshd"
    37   ;;
    38 esac
    39 #PROGRAM="bash"
    40 PROGRAM="sshd"
    41 ARGS="$ARGS $PROGRAM"
    42 proot $ARGS

Then I sshfs from my archlinux computer using the following command

 sshfs ip.of.my.phone:path/to/my/shared/folder -p port 

Then I get the following error.

ip.of.my.phone:path/to/my/shared/folder: Permission denied

However I can ssh into the prooted jail with the following command without any problem.

ssh ip.of.my.phome -p port

I searched around and found that permission errors usually occur when trying to read or write the remote folder after it has been successfully mounted.

what caused it to happen when mounting?

Any idea?

Thanks!

Last edited by WangYilin (2019-08-17 02:33:15)