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re-do the backup script to use the duplicity program
Duplicity will manage the process of creating incremental backups for us. Although duplicity can both encrypt & copy files to a remote host, I really don't like PGP and so I don't want to use that. Instead, we'll back up to a local directory unencrypted, then manually encrypt the full & incremental backup files. Synchronizing the encrypted backup directory to a remote host is a TODO.
This commit is contained in:
Joshua Tauberer
parent
cecda9cec5
commit
5490142df5
@ -10,57 +10,100 @@
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# 4) The backup directory is compressed into a single file using tar.
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# 5) That file is encrypted with a long password stored in backup/secret_key.txt.
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import os, os.path, subprocess
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import sys, os, os.path, shutil
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from utils import exclusive_process, load_environment, shell
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# settings
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full_backup = "--full" in sys.argv
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keep_backups_for = "31D" # destroy backups older than 31 days
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env = load_environment()
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exclusive_process("backup")
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# Ensure the backup directory exists.
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backup_dir = os.path.join(env["STORAGE_ROOT"], 'backup')
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rdiff_backup_dir = os.path.join(backup_dir, 'rdiff-history')
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backup_duplicity_dir = os.path.join(backup_dir, 'duplicity')
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os.makedirs(backup_dir, exist_ok=True)
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# Stop services.
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shell('check_call', ["/usr/sbin/service", "dovecot", "stop"])
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shell('check_call', ["/usr/sbin/service", "postfix", "stop"])
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# Update the backup directory which stores increments.
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# Update the backup mirror directory which mirrors the current
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# STORAGE_ROOT (but excluding the backups themselves!).
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try:
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shell('check_call', [
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"/usr/bin/rdiff-backup",
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"/usr/bin/duplicity",
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"full" if full_backup else "incr",
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"--no-encryption",
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"--archive-dir", "/tmp/duplicity-archive-dir",
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"--name", "mailinabox",
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"--exclude", backup_dir,
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env["STORAGE_ROOT"],
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rdiff_backup_dir])
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except subprocess.CalledProcessError:
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# Trap the error so we restart services again.
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pass
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"--verbosity", "warning",
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env["STORAGE_ROOT"],
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"file://" + backup_duplicity_dir
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])
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finally:
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# Start services again.
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shell('check_call', ["/usr/sbin/service", "dovecot", "start"])
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shell('check_call', ["/usr/sbin/service", "postfix", "start"])
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# Start services.
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shell('check_call', ["/usr/sbin/service", "dovecot", "start"])
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shell('check_call', ["/usr/sbin/service", "postfix", "start"])
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# Tar the rdiff-backup directory into a single file.
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# Remove old backups. This deletes all backup data no longer needed
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# from more than 31 days ago. Must do this before destroying the
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# cache directory or else this command will re-create it.
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shell('check_call', [
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"/bin/tar",
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"-zc",
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"-f", os.path.join(backup_dir, "latest.tgz"),
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"-C", rdiff_backup_dir,
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"."])
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# Encrypt the backup using the backup private key.
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shell('check_call', [
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"/usr/bin/openssl",
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"enc",
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"-aes-256-cbc",
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"-a",
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"-salt",
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"-in", os.path.join(backup_dir, "latest.tgz"),
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"-out", os.path.join(backup_dir, "latest.tgz.enc"),
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"-pass", "file:%s" % os.path.join(backup_dir, "secret_key.txt"),
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"/usr/bin/duplicity",
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"remove-older-than",
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keep_backups_for,
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"--archive-dir", "/tmp/duplicity-archive-dir",
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"--name", "mailinabox",
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"--force",
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"--verbosity", "warning",
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"file://" + backup_duplicity_dir
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])
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# The backup can be decrypted with:
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# openssl enc -d -aes-256-cbc -a -in latest.tgz.enc -out /dev/stdout -pass file:secret_key.txt | tar -z
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# Remove old increments. This deletes incremental data obsoleted by
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# any subsequent full backups.
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shell('check_call', [
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"/usr/bin/duplicity",
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"remove-all-inc-of-but-n-full",
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"1",
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"--archive-dir", "/tmp/duplicity-archive-dir",
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"--name", "mailinabox",
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"--force",
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"--verbosity", "warning",
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"file://" + backup_duplicity_dir
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])
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# Remove duplicity's cache directory because it's redundant with our backup directory.
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shutil.rmtree("/tmp/duplicity-archive-dir")
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# Encrypt all of the new files.
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backup_encrypted_dir = os.path.join(backup_dir, 'encrypted')
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os.makedirs(backup_encrypted_dir, exist_ok=True)
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for fn in os.listdir(backup_duplicity_dir):
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fn2 = os.path.join(backup_encrypted_dir, fn) + ".enc"
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if os.path.exists(fn2): continue
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# Encrypt the backup using the backup private key.
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shell('check_call', [
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"/usr/bin/openssl",
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"enc",
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"-aes-256-cbc",
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"-a",
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"-salt",
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"-in", os.path.join(backup_duplicity_dir, fn),
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"-out", fn2,
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"-pass", "file:%s" % os.path.join(backup_dir, "secret_key.txt"),
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])
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# The backup can be decrypted with:
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# openssl enc -d -aes-256-cbc -a -in latest.tgz.enc -out /dev/stdout -pass file:secret_key.txt | tar -z
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# Remove encrypted backups that are no longer needed.
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for fn in os.listdir(backup_encrypted_dir):
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fn2 = os.path.join(backup_duplicity_dir, fn.replace(".enc", ""))
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if os.path.exists(fn2): continue
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os.unlink(os.path.join(backup_encrypted_dir, fn))
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@ -2,7 +2,7 @@
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source setup/functions.sh
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apt_install python3-flask links rdiff-backup
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apt_install python3-flask links duplicity
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# Create a backup directory and a random key for encrypting backups.
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mkdir -p $STORAGE_ROOT/backup
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