Debugging Samba with Symbols

samba_debug.txt

docker run \
    -it \
    --rm \
    --publish 445:445 \
    --cap-add=SYS_PTRACE \
    --security-opt seccomp=unconfined \
    archlinux:latest \
    /bin/bash


### INSIDE THE CONTAINER ###

pacman -Syu \
    --noconfirm \
    bison \
    flex \
    gcc \
    gdb \
    make \
    perl \
    perl-parse-yapp \
    pkg-config \
    python3 \
    rpcsvc-proto \
    vim \
    wget \
    zlib

export PATH=/usr/bin/vendor_perl:$PATH

wget https://download.samba.org/pub/samba/stable/samba-4.15.0.tar.gz
tar -zxf samba-4.15.0.tar.gz
cd samba-4.15.0

./configure \
    --enable-debug \
    --without-ad-dc \
    --without-json
make -j 16
make install

export PATH=/usr/local/samba/bin/:/usr/local/samba/sbin/:$PATH

cat > /usr/local/samba/etc/smb.conf << EOL
[global]
host msdfs = yes
workgroup = WORKGROUP
valid users = @smbgroup
server signing = mandatory
ea support = yes
store dos attributes = yes
vfs objects = xattr_tdb streams_xattr
log level = 10
panic action = /bin/sleep 9999999

[dfs]
comment = Test Samba DFS Root
path = /srv/samba/dfsroot
browsable = yes
guest ok = no
read only = no
create mask = 0755
msdfs root = yes

[share]
comment = Test Samba Share
path = /srv/samba/share
browsable = yes
guest ok = no
read only = no
create mask = 0755

[share-encrypted]
comment = Test Encrypted Samba Share
path = /srv/samba/share-encrypted
browsable = yes
guest ok = no
read only = no
create mask = 0755
smb encrypt = required
EOL

groupadd smbgroup
useradd smbuser -G smbgroup
(echo smbpass; echo smbpass) | smbpasswd -s -a smbuser

mkdir -p /srv/samba/dfsroot
chmod -R 0755 /srv/samba/dfsroot
chown -R smbuser:smbgroup /srv/samba/dfsroot
ln -s msdfs:localhost\\share /srv/samba/dfsroot/share
ln -s msdfs:localhost\\missing,localhost\\share-encrypted /srv/samba/dfsroot/share-encrypted
ln -s msdfs:localhost\\missing /srv/samba/dfsroot/broken

mkdir -p /srv/samba/share
chmod -R 0755 /srv/samba/share
chown -R smbuser:smbgroup /srv/samba/share

mkdir -p /srv/samba/share-encrypted
chmod -R 0755 /srv/samba/share-encrypted
chown -R smbuser:smbgroup /srv/samba/share-encrypted

smbd --debug-stdout --foreground --no-process-group > /tmp/samba.log


### CODE TO RUN ON WINDOWS ###

$file = "\\server\share\file.txt"
Set-Content -Path $file -Value data
Set-Content -Path $file -Stream ALT -Value data
Get-Item $file -Stream *
Remove-Item -Path $file -Force


### ONCE HUNG ###

docker exec -it CONTAINER_ID /bin/bash
ps -aef --forest

gdb -p PID_OF_SLEEP_PARENT
bt