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privacy-guides/how-to-self-host-a-hardened-borg-backup-server-and-configure-macos-client/README.md
Sun Knudsen 30832095cc
Improved Borg guide
2020-11-23 08:29:09 -05:00

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How to self-host a hardened Borg backup server and configure macOS client

Requirements

  • Virtual private server (VPS) or dedicated server running Debian 10 (buster)
  • Computer running macOS Mojave or Catalina

Caveats

  • When copy/pasting commands that start with $, strip out $ as this character is not part of the command
  • When copy/pasting commands that start with cat << "EOF", select all lines at once (from cat << "EOF" to EOF inclusively) as they are part of the same (single) command

Setup guide

Step 1: create server SSH key pair (on Mac)

When asked for file in which to save key, enter server.

When asked for passphrase, use output from openssl rand -base64 24 (and store passphrase in password manager).

Use server.pub public key when setting up server.

$ mkdir -p ~/.ssh

$ cd ~/.ssh

$ ssh-keygen -t rsa -C "server"
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/sunknudsen/.ssh/id_rsa): server
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in server.
Your public key has been saved in server.pub.
The key fingerprint is:
SHA256:rZFDBWi8f6BcRR2gqzIWmWtBiLdk89znOSpZkZGOQH8 server
The key's randomart image is:
+---[RSA 3072]----+
| ..  . o.o+o..   |
| ..o  *  o. .    |
|. *.o+E+o.       |
| + *.==.o+       |
|  . B..=S..      |
|     +++.=.      |
|    *o. =.       |
|   ooo . .       |
|     ..          |
+----[SHA256]-----+

$ cat server.pub
ssh-rsa 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 server

Step 2: create borg SSH key pair (on Mac)

When asked for file in which to save key, enter borg.

When asked for passphrase, leave field empty for no passphrase.

$ ssh-keygen -t rsa -C "borg"
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/sunknudsen/.ssh/id_rsa): borg
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in borg.
Your public key has been saved in borg.pub.
The key fingerprint is:
SHA256:ZB293/YueacLtg2a5anHe/PXruP8YwZXwU/caebReSk borg
The key's randomart image is:
+---[RSA 3072]----+
|          ..  ..*|
|         . ..E X*|
|        o .  .=.=|
|       o    .  .o|
|        S    . ..|
|             ...o|
|           .= ooo|
|           *oB*+*|
|          +o=+X&O|
+----[SHA256]-----+

$ cat borg.pub
ssh-rsa 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 borg

Step 3: generate SSH authorized keys heredoc (on Mac)

Set temporary environment variable

BORG_STORAGE_QUOTA backup storage quota

BORG_STORAGE_QUOTA="10G"

Generate heredoc (the output of following command will be used at step 21)

cat << _EOF
cat << EOF > /home/borg/.ssh/authorized_keys
command="borg serve --append-only --restrict-to-repository /home/borg/backup --storage-quota $BORG_STORAGE_QUOTA",restrict $(cat ~/.ssh/borg.pub)"
command="borg serve --restrict-to-repository /home/borg/backup --storage-quota $BORG_STORAGE_QUOTA",restrict $(cat ~/.ssh/server.pub)"
EOF
_EOF

Step 4: log in to server as root

Replace 185.112.144.30 with IP of server.

ssh root@185.112.144.30 -i ~/.ssh/server

Step 5: create server-admin user

When asked for password, use output from openssl rand -base64 24 (and store password in password manager).

All other fields are optional, press enter to skip them and then press Y.

$ adduser server-admin
Adding user `server-admin' ...
Adding new group `server-admin' (1000) ...
Adding new user `server-admin' (1000) with group `server-admin' ...
Creating home directory `/home/server-admin' ...
Copying files from `/etc/skel' ...
New password:
Retype new password:
passwd: password updated successfully
Changing the user information for server-admin
Enter the new value, or press ENTER for the default
	Full Name []:
	Room Number []:
	Work Phone []:
	Home Phone []:
	Other []:
Is the information correct? [Y/n] Y

Step 6: create borg user

When asked for password, use output from openssl rand -base64 24 (and store password in password manager).

All other fields are optional, press enter to skip them and then press Y.

$ adduser borg
Adding user `borg' ...
Adding new group `borg' (1000) ...
Adding new user `borg' (1000) with group `borg' ...
Creating home directory `/home/borg' ...
Copying files from `/etc/skel' ...
New password:
Retype new password:
passwd: password updated successfully
Changing the user information for borg
Enter the new value, or press ENTER for the default
	Full Name []:
	Room Number []:
	Work Phone []:
	Home Phone []:
	Other []:
Is the information correct? [Y/n] Y

Step 7: copy root’s authorized_keys file to server-admin’s home folder

mkdir /home/server-admin/.ssh
cp /root/.ssh/authorized_keys /home/server-admin/.ssh/authorized_keys
chown -R server-admin:server-admin /home/server-admin/.ssh

Step 8: set root password

When asked for password, use output from openssl rand -base64 24 (and store password in password manager).

passwd

Step 9: log out

exit

Step 10: log in as server-admin

Replace 185.112.144.30 with IP of server.

ssh server-admin@185.112.144.30 -i ~/.ssh/server

Step 11: switch to root

When asked, enter root password.

su -

Step 12: update SSH config to disable root login and password authentication and restart SSH

sed -i -E 's/(#)?PermitRootLogin (prohibit-password|yes)/PermitRootLogin no/' /etc/ssh/sshd_config
sed -i -E 's/(#)?PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config
systemctl restart ssh

Step 13: update APT index and upgrade packages

Update APT index

apt update

Upgrade packages

apt upgrade -y

Step 14: install and configure Vim

Install Vim

apt install -y vim

Configure Vim

cat << "EOF" > ~/.vimrc
set encoding=UTF-8
set termencoding=UTF-8
set nocompatible
set backspace=indent,eol,start
set autoindent
set tabstop=2
set shiftwidth=2
set expandtab
set smarttab
set ruler
set paste
syntax on
EOF

Step 15: set timezone (the following is for Montreal time)

See https://en.wikipedia.org/wiki/List_of_tz_database_time_zones for available timezones.

timedatectl set-timezone America/Montreal

Step 16: install iptables-persistent

When asked to save current IPv4 or IPv6 rules, answer Yes.

apt install -y iptables-persistent

Step 17: configure iptables

iptables -N SSH_BRUTE_FORCE_MITIGATION
iptables -A SSH_BRUTE_FORCE_MITIGATION -m recent --name SSH --set
iptables -A SSH_BRUTE_FORCE_MITIGATION -m recent --name SSH --update --seconds 300 --hitcount 10 -m limit --limit 1/second --limit-burst 100 -j LOG --log-prefix "iptables[ssh-brute-force]: "
iptables -A SSH_BRUTE_FORCE_MITIGATION -m recent --name SSH --update --seconds 300 --hitcount 10 -j DROP
iptables -A SSH_BRUTE_FORCE_MITIGATION -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -p tcp --dport 22 --syn -m conntrack --ctstate NEW -j SSH_BRUTE_FORCE_MITIGATION
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
iptables -A OUTPUT -p tcp --dport 53 -m state --state NEW -j ACCEPT
iptables -A OUTPUT -p udp --dport 53 -m state --state NEW -j ACCEPT
iptables -A OUTPUT -p tcp --dport 80 -m state --state NEW -j ACCEPT
iptables -A OUTPUT -p udp --dport 123 -m state --state NEW -j ACCEPT
iptables -A OUTPUT -p tcp --dport 443 -m state --state NEW -j ACCEPT
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -P FORWARD DROP
iptables -P INPUT DROP
iptables -P OUTPUT DROP

If the server is IPv4-only, run:

ip6tables -P FORWARD DROP
ip6tables -P INPUT DROP
ip6tables -P OUTPUT DROP

If the server is dual stack (IPv4 + IPv6) run:

ip6tables -A INPUT -i lo -j ACCEPT
ip6tables -A INPUT -p ipv6-icmp --icmpv6-type destination-unreachable -j ACCEPT
ip6tables -A INPUT -p ipv6-icmp --icmpv6-type packet-too-big -j ACCEPT
ip6tables -A INPUT -p ipv6-icmp --icmpv6-type time-exceeded -j ACCEPT
ip6tables -A INPUT -p ipv6-icmp --icmpv6-type parameter-problem -j ACCEPT
ip6tables -A INPUT -p ipv6-icmp --icmpv6-type router-advertisement -m hl --hl-eq 255 -j ACCEPT
ip6tables -A INPUT -p ipv6-icmp --icmpv6-type neighbor-solicitation -m hl --hl-eq 255 -j ACCEPT
ip6tables -A INPUT -p ipv6-icmp --icmpv6-type neighbor-advertisement -m hl --hl-eq 255 -j ACCEPT
ip6tables -A INPUT -p ipv6-icmp --icmpv6-type redirect -m hl --hl-eq 255 -j ACCEPT
ip6tables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
ip6tables -A OUTPUT -o lo -j ACCEPT
ip6tables -A OUTPUT -p ipv6-icmp --icmpv6-type destination-unreachable -j ACCEPT
ip6tables -A OUTPUT -p ipv6-icmp --icmpv6-type packet-too-big -j ACCEPT
ip6tables -A OUTPUT -p ipv6-icmp --icmpv6-type time-exceeded -j ACCEPT
ip6tables -A OUTPUT -p ipv6-icmp --icmpv6-type parameter-problem -j ACCEPT
ip6tables -A OUTPUT -p ipv6-icmp --icmpv6-type router-solicitation -m hl --hl-eq 255 -j ACCEPT
ip6tables -A OUTPUT -p ipv6-icmp --icmpv6-type neighbour-solicitation -m hl --hl-eq 255 -j ACCEPT
ip6tables -A OUTPUT -p ipv6-icmp --icmpv6-type neighbour-advertisement -m hl --hl-eq 255 -j ACCEPT
ip6tables -A OUTPUT -p tcp --dport 53 -m state --state NEW -j ACCEPT
ip6tables -A OUTPUT -p udp --dport 53 -m state --state NEW -j ACCEPT
ip6tables -A OUTPUT -p tcp --dport 80 -m state --state NEW -j ACCEPT
ip6tables -A OUTPUT -p udp --dport 123 -m state --state NEW -j ACCEPT
ip6tables -A OUTPUT -p tcp --dport 443 -m state --state NEW -j ACCEPT
ip6tables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
ip6tables -P FORWARD DROP
ip6tables -P INPUT DROP
ip6tables -P OUTPUT DROP

Step 18: log out and log in to confirm iptables didn’t block SSH

Log out

exit
exit

Log in

Replace 185.112.144.30 with IP of server.

ssh server-admin@185.112.144.30 -i ~/.ssh/server

Switch to root

When asked, enter root password.

su -

Step 19: make iptables rules persistent

iptables-save > /etc/iptables/rules.v4
ip6tables-save > /etc/iptables/rules.v6

Step 20: install Borg

apt install -y borgbackup

Step 21: configure borg’s SSH authorized keys

Switch to borg

su - borg

Create .ssh folder

mkdir -p /home/borg/.ssh

Create /home/borg/.ssh/authorized_keys using heredoc generated at step 3

cat << EOF > /home/borg/.ssh/authorized_keys
command="borg serve --append-only --restrict-to-repository /home/borg/backup --storage-quota 10G",restrict ssh-rsa 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 borg"
command="borg serve --restrict-to-repository /home/borg/backup --storage-quota 10G",restrict ssh-rsa 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 server"
EOF

Heads-up: the following steps are done on Mac.

Step 22: download and install FUSE for macOS

Go to https://osxfuse.github.io/, download and install latest release.

Step 23: install Homebrew

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

Step 24: disable Homebrew analytics

brew analytics off

Step 25: install Borg

brew install borgbackup

Step 26: configure Borg

Generate Borg passphrase using openssl and add passphrase to “Keychain Access”

security add-generic-password -D secret -U -a $USER -s borg-passphrase -w $(openssl rand -base64 24)

Initialize Borg repo

Replace 185.112.144.30 with IP of server.

$ export BORG_PASSCOMMAND="security find-generic-password -a $USER -s borg-passphrase -w"

$ export BORG_RSH="ssh -i ~/.ssh/borg"

$ borg init --encryption=keyfile-blake2 "borg@185.112.144.30:backup"

By default repositories initialized with this version will produce security
errors if written to with an older version (up to and including Borg 1.0.8).

If you want to use these older versions, you can disable the check by running:
borg upgrade --disable-tam ssh://borg@185.112.144.30/./backup

See https://borgbackup.readthedocs.io/en/stable/changes.html#pre-1-0-9-manifest-spoofing-vulnerability for details about the security implications.

IMPORTANT: you will need both KEY AND PASSPHRASE to access this repo!
Use "borg key export" to export the key, optionally in printable format.
Write down the passphrase. Store both at safe place(s).

Backup ~/.config/borg and ~/Library/Keychains folders

Heads-up: both key (stored in ~/.config/borg) and passphrase (stored in ~/Library/Keychains) are required to decrypt backup.

Step 27: set temporary environment variables

Replace 185.112.144.30 with IP of server and set backup name.

SERVER_IP="185.112.144.30"
BACKUP_NAME="$USER-macbook-pro"

Step 28: create /usr/local/bin/borg-backup.sh script

cat << EOF > /usr/local/bin/borg-backup.sh
#! /bin/sh

set -e

repo="borg@$SERVER_IP:backup"
prefix="$BACKUP_NAME-"

export BORG_PASSCOMMAND="security find-generic-password -a $USER -s borg-passphrase -w"
export BORG_RSH="ssh -i ~/.ssh/borg"

borg create \\
  --filter "AME" \\
  --list \\
  --stats \\
  --verbose \\
  "\$repo::\$prefix{now:%F-%H%M%S}" \\
  "/Users/$USER/.gnupg" \\
  "/Users/$USER/.ssh" \\
  "/Users/$USER/Library/Keychains"

printf "%s\n" "Done"
EOF
chmod +x /usr/local/bin/borg-backup.sh

Step 29: edit /usr/local/bin/borg-backup.sh script

vi /usr/local/bin/borg-backup.sh

Step 30: create /usr/local/bin/borg-list.sh script

cat << EOF > /usr/local/bin/borg-list.sh
#! /bin/sh

set -e

prefix="$BACKUP_NAME-"
repo="borg@$SERVER_IP:backup"

export BORG_PASSCOMMAND="security find-generic-password -a $USER -s borg-passphrase -w"
export BORG_RSH="ssh -i ~/.ssh/borg"

borg list --prefix "\$prefix" "\$repo"

printf "%s\n" "Done"
EOF
chmod +x /usr/local/bin/borg-list.sh

Step 31: create /usr/local/bin/borg-prune.sh script

cat << EOF > /usr/local/bin/borg-prune.sh
#! /bin/sh

set -e

prefix="$BACKUP_NAME-"
repo="borg@$SERVER_IP:backup"

export BORG_PASSCOMMAND="security find-generic-password -a $USER -s borg-passphrase -w"
export BORG_RSH="ssh -i ~/.ssh/server"

borg prune --keep-daily 7 --keep-weekly 4 --keep-monthly 12 --list --prefix "\$prefix" --stats "\$repo"

printf "%s\n" "Done"
EOF
chmod +x /usr/local/bin/borg-prune.sh

Step 32: create /usr/local/bin/borg-restore.sh script

cat << EOF > /usr/local/bin/borg-restore.sh
#! /bin/sh

set -e

function umount()
{
  if [ -d "\$mount_point" ]; then
    borg umount \$mount_point
  fi
}

trap umount ERR INT

mount_point="\${TMPDIR}borg"
prefix="$BACKUP_NAME-"
repo="borg@$SERVER_IP:backup"

mkdir -p \$mount_point

export BORG_PASSCOMMAND="security find-generic-password -a $USER -s borg-passphrase -w"
export BORG_RSH="ssh -i ~/.ssh/borg"

borg mount --prefix "\$prefix" "\$repo" "\$mount_point"

open \$mount_point

printf "Restore data and press enter"

read -r answer

umount

printf "%s\n" "Done"
EOF
chmod +x /usr/local/bin/borg-restore.sh

Step 33: install Borg Backup

Go to https://github.com/sunknudsen/borg-backup/releases and download latest .dmg release (PGP public key)

Double-click .dmg release and drag and drop “Borg Backup” to the “Applications” folder

Step 34: create /usr/local/var/log folder

mkdir -p /usr/local/var/log

Step 35: run “Borg Backup”

open /Applications/Borg\ Backup.app

Heads-up: given “Borg Backup” is developed outside the Apple Developer Program, macOS prevents opening the app without explicit user consent (clicking “Open Anyway” in “System Preferences” / “Privacy & Security”).

Allow app step 1

Allow app step 2

Allow app step 3

Step 36: schedule backup every hour using launchd

mkdir -p ~/Library/LaunchAgents
cat << EOF > ~/Library/LaunchAgents/local.borg-backup.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>Label</key>
    <string>Borg Backup.app</string>

    <key>ProgramArguments</key>
    <array>
      <string>open</string>
      <string>/Applications/Borg Backup.app</string>
    </array>

    <key>RunAtLoad</key>
    <false/>

    <key>StartCalendarInterval</key>
    <dict>
      <key>Minute</key>
      <integer>0</integer>
    </dict>
  </dict>
</plist>
EOF
launchctl load ~/Library/LaunchAgents/local.borg-backup.plist

Usage guide

Backup

$ borg-backup.sh
Creating archive at "borg@185.112.144.30:backup::sunknudsen-macbook-pro-{now:%F-%H%M%S}"
A /Users/sunknudsen/Library/Keychains/4FD89B1C-70AF-58EC-8026-35E97A08F9FE/keychain-2.db-wal
Remote: Storage quota: 667.73 kB out of 10.00 GB used.
Remote: Storage quota: 671.72 kB out of 10.00 GB used.
------------------------------------------------------------------------------
Archive name: sunknudsen-macbook-pro-2020-11-12-095711
Archive fingerprint: 943420e2bfd0154a953c7dc84a6c42f1ab49888e17453df0c63518b65512d718
Time (start): Thu, 2020-11-12 09:57:14
Time (end):   Thu, 2020-11-12 09:57:15
Duration: 0.39 seconds
Number of files: 29
Utilization of max. archive size: 0%
------------------------------------------------------------------------------
                       Original size      Compressed size    Deduplicated size
This archive:                8.43 MB            666.16 kB              3.84 kB
All archives:               16.87 MB              1.33 MB            669.77 kB

                       Unique chunks         Total chunks
Chunk index:                      31                   62
------------------------------------------------------------------------------
Done

Done

👍

List

$ borg-list.sh
sunknudsen-macbook-pro-2020-11-12-095625 Thu, 2020-11-12 09:56:28 [a8f8ef592501cc240da7f000b23626a4371719565d8c9e5ce55855b1fe465742]
sunknudsen-macbook-pro-2020-11-12-095711 Thu, 2020-11-12 09:57:14 [943420e2bfd0154a953c7dc84a6c42f1ab49888e17453df0c63518b65512d718]
Done

Done

👍

Prune

$ borg-prune.sh
Enter passphrase for key '/Users/sunknudsen/.ssh/server':
Keeping archive: sunknudsen-macbook-pro-2020-11-12-095711 Thu, 2020-11-12 09:57:14 [943420e2bfd0154a953c7dc84a6c42f1ab49888e17453df0c63518b65512d718]
Pruning archive: sunknudsen-macbook-pro-2020-11-12-095625 Thu, 2020-11-12 09:56:28 [a8f8ef592501cc240da7f000b23626a4371719565d8c9e5ce55855b1fe465742] (1/1)
------------------------------------------------------------------------------
                       Original size      Compressed size    Deduplicated size
Deleted data:               -8.43 MB           -666.16 kB             -3.84 kB
All archives:                8.43 MB            666.16 kB            665.93 kB

                       Unique chunks         Total chunks
Chunk index:                      29                   31
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Done

Done

👍

Restore

$ borg-restore.sh
Restore data and press enter
Done

Done

👍