95 lines
3.5 KiB
Python
95 lines
3.5 KiB
Python
"""SSL tools."""
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import os
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from . import utils
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class CertificateBackend(object):
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"""Base class."""
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def __init__(self, config):
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"""Set path to certificates."""
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self.config = config
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def overwrite_existing_certificate(self):
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"""Check if certificate already exists."""
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if os.path.exists(self.config.get("general", "tls_key_file")):
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if not self.config.getboolean("general", "force"):
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answer = utils.user_input(
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"Overwrite the existing SSL certificate? (y/N) ")
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if not answer.lower().startswith("y"):
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return False
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return True
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class SelfSignedCertificate(CertificateBackend):
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"""Create a self signed certificate."""
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def __init__(self, *args, **kwargs):
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"""Sanity checks."""
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super(SelfSignedCertificate, self).__init__(*args, **kwargs)
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if self.config.has_option("general", "tls_key_file"):
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# Compatibility
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return
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for base_dir in ["/etc/pki/tls", "/etc/ssl"]:
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if os.path.exists(base_dir):
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self.config.set(
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"general", "tls_key_file",
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"{}/private/%(hostname)s.key".format(base_dir))
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self.config.set(
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"general", "tls_cert_file",
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"{}/certs/%(hostname)s.cert".format(base_dir))
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return
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raise RuntimeError("Cannot find a directory to store certificate")
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def create(self):
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"""Create a certificate."""
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if not self.overwrite_existing_certificate():
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return
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utils.printcolor(
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"Generating new self-signed certificate", utils.YELLOW)
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utils.exec_cmd(
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"openssl req -new -newkey rsa:4096 -days 365 -nodes -x509 "
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"-subj '/CN={}' -keyout {} -out {}".format(
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self.config.get("general", "hostname"),
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self.config.get("general", "tls_key_file"),
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self.config.get("general", "tls_cert_file"))
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)
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class LetsEncryptCertificate(CertificateBackend):
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"""Create a certificate using letsencrypt."""
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def create(self):
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"""Create a certificate."""
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utils.printcolor(
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"Generating new certificate using letsencrypt", utils.YELLOW)
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hostname = self.config.get("general", "hostname")
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utils.exec_cmd(
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"wget https://dl.eff.org/certbot-auto; chmod a+x certbot-auto",
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cwd="/opt")
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utils.exec_cmd(
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"/opt/certbot-auto certonly -n --standalone -d {} "
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"-m {} --agree-tos".format(
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hostname, self.config.get("letsencrypt", "email")))
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self.config.set("general", "tls_cert_file", (
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"/etc/letsencrypt/live/{}/fullchain.pem".format(hostname)))
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self.config.set("general", "tls_key_file", (
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"/etc/letsencrypt/live/{}/privkey.pem".format(hostname)))
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with open("/etc/cron.d/letsencrypt", "w") as fp:
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fp.write("0 */12 * * * root /opt/certbot-auto renew "
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"--quiet --no-self-upgrade && "
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"service nginx reload && "
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"service postfix reload && "
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"service dovecot reload")
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def get_backend(config):
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"""Return the appropriate backend."""
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if not config.getboolean("certificate", "generate"):
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return None
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if config.get("certificate", "type") == "letsencrypt":
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return LetsEncryptCertificate(config)
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return SelfSignedCertificate(config)
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