Weather Transfer Files

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Development

1. Build the container via

docker-compose build

2. Boot the container via

docker-compose up

3. Go to localhost in your browser to see the app landing page.

4. Go to localhost/ to see the upload files by group.

5. Connect to the server via sftp to test connection.

sftp -P 22 group_b@localhost
# verify server fingerprint
# enter group b's password as seen in the sftp/users.conf file

Production

1. Duplicate the example sftp/users.conf.example file and edit as desired.

cp sftp/users.conf.example sftp/users.conf
nano sftp/users.conf

2. Generate a ed25519 and rsa key files via:

ssh-keygen -t ed25519 -f sftp/ssh_host_ed25519_key < /dev/null
ssh-keygen -t rsa -b 4096 -f sftp/ssh_host_rsa_key < /dev/null

4. You can generate a fingerprint for a public key using ssh-keygen like so:

# sha256 fingerprint
ssh-keygen -lf sftp/ssh_host_ed25519_key.pub > files/sha256-server-fingerprint.txt

# or md5 fingerprint
ssh-keygen -l -E md5 -f sftp/ssh_host_ed25519_key.pub > files/md5-server-fingerprint.txt

5. (optional) Auto-load public keys for a specific user by adding the key to the sftp/keys_by_user folder. The format is keys_by_user/user-name/.ssh/keys/id_ed25519_key.pub, as seen in the sftp/keys_by_user/example_user folder.

6. Boot the app via docker-compose up -d --build

7. (optional) For passwordless login, load public ssh keys for a given user via:

Only needed if you didn't auto-load the keys earlier.

container_id=$(docker ps -q --filter name="sftp")

docker cp ~/.ssh/id_ed25519.pub $container_id:/tmp/
docker-compose exec sftp bash

# inside the container
# create an .ssh director owned by root
user="group_a"
uid="$(id -u "$user")"
user_ssh_folder="/home/$user/.ssh"
mkdir -p "$user_ssh_folder"

# add key to the authorized keys file and set owner to appropriate user
user_authorized_keys_file="$user_ssh_folder/authorized_keys"
cat "/tmp/id_ed25519.pub" >> "$user_authorized_keys_file"
chown "$uid" "$user_authorized_keys_file"
chmod 600 "$user_authorized_keys_file"

For End-Users

1. Set up an example .ssh/config.

Host weather-transfer-files
    HostName some-host-name
    USER group_a
    Port 22