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Code Issues Releases Wiki Activity

management: shell out external programs in a more secure way

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This commit is contained in:
Joshua Tauberer 2014-06-09 08:09:45 -04:00
parent 70bd96f643
commit cecda9cec5
4 changed files with 57 additions and 28 deletions
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42
management/backup.py
View File

@ -12,7 +12,7 @@
import os, os.path, subprocess import os, os.path, subprocess
from utils import exclusive_process, load_environment from utils import exclusive_process, load_environment, shell
env = load_environment() env = load_environment()
@ -24,31 +24,43 @@ rdiff_backup_dir = os.path.join(backup_dir, 'rdiff-history')
os.makedirs(backup_dir, exist_ok=True) os.makedirs(backup_dir, exist_ok=True)
# Stop services. # Stop services.
subprocess.check_call(["service", "dovecot", "stop"]) shell('check_call', ["/usr/sbin/service", "dovecot", "stop"])
subprocess.check_call(["service", "postfix", "stop"]) shell('check_call', ["/usr/sbin/service", "postfix", "stop"])
# Update the backup directory which stores increments. # Update the backup directory which stores increments.
try: try:
subprocess.check_call([ shell('check_call', [
"rdiff-backup", "/usr/bin/rdiff-backup",
"--exclude", backup_dir, "--exclude", backup_dir,
env["STORAGE_ROOT"], env["STORAGE_ROOT"],
rdiff_backup_dir]) rdiff_backup_dir])
except subprocess.CalledProcessError: except subprocess.CalledProcessError:
# Trap the error so we restart services again.
pass pass
# Start services. # Start services.
subprocess.check_call(["service", "dovecot", "start"]) shell('check_call', ["/usr/sbin/service", "dovecot", "start"])
subprocess.check_call(["service", "postfix", "start"]) shell('check_call', ["/usr/sbin/service", "postfix", "start"])
# Tar the rdiff-backup directory into a single file encrypted using the backup private key. # Tar the rdiff-backup directory into a single file.
os.system( shell('check_call', [
"tar -zcC %s . | openssl enc -aes-256-cbc -a -salt -in /dev/stdin -out %s -pass file:%s" "/bin/tar",
% "-zc",
( rdiff_backup_dir, "-f", os.path.join(backup_dir, "latest.tgz"),
os.path.join(backup_dir, "latest.tgz.enc"), "-C", rdiff_backup_dir,
os.path.join(backup_dir, "secret_key.txt"), "."])
))
# Encrypt the backup using the backup private key.
shell('check_call', [
"/usr/bin/openssl",
"enc",
"-aes-256-cbc",
"-a",
"-salt",
"-in", os.path.join(backup_dir, "latest.tgz"),
"-out", os.path.join(backup_dir, "latest.tgz.enc"),
"-pass", "file:%s" % os.path.join(backup_dir, "secret_key.txt"),
])
# The backup can be decrypted with: # The backup can be decrypted with:
# openssl enc -d -aes-256-cbc -a -in latest.tgz.enc -out /dev/stdout -pass file:secret_key.txt | tar -z # openssl enc -d -aes-256-cbc -a -in latest.tgz.enc -out /dev/stdout -pass file:secret_key.txt | tar -z

20
management/daemon.py
View File

@ -1,6 +1,6 @@
#!/usr/bin/python3 #!/usr/bin/python3
import os, os.path, subprocess import os, os.path, re
from flask import Flask, request, render_template from flask import Flask, request, render_template
app = Flask(__name__) app = Flask(__name__)
@ -59,15 +59,21 @@ def dns_update():
@app.route('/system/updates') @app.route('/system/updates')
def show_updates(): def show_updates():
subprocess.check_call("apt-get -qq update", shell=True) utils.shell("check_call", ["/usr/bin/apt-get", "-qq", "update"])
return subprocess.check_output( simulated_install = utils.shell("check_output", ["/usr/bin/apt-get", "-qq", "-s", "upgrade"])
r"""apt-get -qq -s upgrade | grep -v ^Conf | sed "s/^Inst /Updated Package Available: /" | sed "s/\[\(.*\)\] (\(\S*\).*/\(\1 => \2\)/" """, pkgs = []
shell=True) for line in simulated_install.split('\n'):
if re.match(r'^Conf .*', line): continue # remove these lines, not informative
line = re.sub(r'^Inst (.*) \[(.*)\] \((\S*).*', r'Updated Package Available: \1 (\3)', line) # make these lines prettier
pkgs.append(line)
return "\n".join(pkgs)
@app.route('/system/update-packages', methods=["POST"]) @app.route('/system/update-packages', methods=["POST"])
def do_updates(): def do_updates():
subprocess.check_call("apt-get -qq update", shell=True) utils.shell("check_call", ["/usr/bin/apt-get", "-qq", "update"])
return subprocess.check_output("DEBIAN_FRONTEND=noninteractive apt-get -y upgrade", shell=True) return utils.shell("check_output", ["/usr/bin/apt-get", "-y", "upgrade"], env={
"DEBIAN_FRONTEND": "noninteractive"
})
# APP # APP

11
management/mailconfig.py
View File

@ -1,4 +1,5 @@
import subprocess, shutil, os, sqlite3, re import subprocess, shutil, os, sqlite3, re
import utils
def validate_email(email, strict): def validate_email(email, strict):
# There are a lot of characters permitted in email addresses, but # There are a lot of characters permitted in email addresses, but
@ -52,7 +53,7 @@ def add_mail_user(email, pw, env):
conn, c = open_database(env, with_connection=True) conn, c = open_database(env, with_connection=True)
# hash the password # hash the password
pw = subprocess.check_output(["/usr/bin/doveadm", "pw", "-s", "SHA512-CRYPT", "-p", pw]).strip() pw = utils.shell('check_output', ["/usr/bin/doveadm", "pw", "-s", "SHA512-CRYPT", "-p", pw]).strip()
# add the user to the database # add the user to the database
try: try:
@ -68,14 +69,14 @@ def add_mail_user(email, pw, env):
# Check if the mailboxes exist before creating them. When creating a user that had previously # Check if the mailboxes exist before creating them. When creating a user that had previously
# been deleted, the mailboxes will still exist because they are still on disk. # been deleted, the mailboxes will still exist because they are still on disk.
try: try:
existing_mboxes = subprocess.check_output(["doveadm", "mailbox", "list", "-u", email, "-8"], stderr=subprocess.STDOUT).decode("utf8").split("\n") existing_mboxes = utils.shell('check_output', ["doveadm", "mailbox", "list", "-u", email, "-8"], capture_stderr=True).split("\n")
except subprocess.CalledProcessError as e: except subprocess.CalledProcessError as e:
c.execute("DELETE FROM users WHERE email=?", (email,)) c.execute("DELETE FROM users WHERE email=?", (email,))
conn.commit() conn.commit()
return ("Failed to initialize the user: " + e.output.decode("utf8"), 400) return ("Failed to initialize the user: " + e.output.decode("utf8"), 400)
if "INBOX" not in existing_mboxes: subprocess.check_call(["doveadm", "mailbox", "create", "-u", email, "-s", "INBOX"]) if "INBOX" not in existing_mboxes: utils.shell('check_call', ["doveadm", "mailbox", "create", "-u", email, "-s", "INBOX"])
if "Spam" not in existing_mboxes: subprocess.check_call(["doveadm", "mailbox", "create", "-u", email, "-s", "Spam"]) if "Spam" not in existing_mboxes: utils.shell('check_call', ["doveadm", "mailbox", "create", "-u", email, "-s", "Spam"])
# Create the user's sieve script to move spam into the Spam folder, and make it owned by mail. # Create the user's sieve script to move spam into the Spam folder, and make it owned by mail.
maildirstat = os.stat(env["STORAGE_ROOT"] + "/mail/mailboxes") maildirstat = os.stat(env["STORAGE_ROOT"] + "/mail/mailboxes")
@ -93,7 +94,7 @@ def add_mail_user(email, pw, env):
def set_mail_password(email, pw, env): def set_mail_password(email, pw, env):
# hash the password # hash the password
pw = subprocess.check_output(["/usr/bin/doveadm", "pw", "-s", "SHA512-CRYPT", "-p", pw]).strip() pw = utils.shell('check_output', ["/usr/bin/doveadm", "pw", "-s", "SHA512-CRYPT", "-p", pw]).strip()
# update the database # update the database
conn, c = open_database(env, with_connection=True) conn, c = open_database(env, with_connection=True)

10
management/utils.py
View File

@ -75,3 +75,13 @@ def is_pid_valid(pid):
raise raise
else: else:
return True return True
def shell(method, cmd_args, env={}, capture_stderr=False):
# A safe way to execute processes.
# Some processes like apt-get require being given a sane PATH.
import subprocess
env.update({ "PATH": "/sbin:/bin:/usr/sbin:/usr/bin" })
stderr = None if not capture_stderr else subprocess.STDOUT
ret = getattr(subprocess, method)(cmd_args, env=env, stderr=stderr)
if isinstance(ret, bytes): ret = ret.decode("utf8")
return ret