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dns_update: dont restart the opendkim process if nothing changed

This commit is contained in:
Joshua Tauberer 2014-08-17 20:42:17 +00:00
parent 919a5a8f0b
commit ba8e015795
1 changed files with 49 additions and 25 deletions
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70
management/dns_update.py
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@ -115,10 +115,12 @@ def do_dns_update(env, force=False):
shell('check_call', ["/usr/sbin/service", "nsd", "restart"])
# Write the OpenDKIM configuration tables.
write_opendkim_tables(zonefiles, env)
# Kick opendkim.
if write_opendkim_tables(zonefiles, env):
# Settings changed. Kick opendkim.
shell('check_call', ["/usr/sbin/service", "opendkim", "restart"])
if len(updated_domains) == 0:
# If this is the only thing that changed?
updated_domains.append("OpenDKIM configuration")
if len(updated_domains) == 0:
# if nothing was updated (except maybe OpenDKIM's files), don't show any output
@ -512,31 +514,53 @@ def get_ds_records(env):
def write_opendkim_tables(zonefiles, env):
# Append a record to OpenDKIM's KeyTable and SigningTable for each domain.
#
# The SigningTable maps email addresses to signing information. The KeyTable
# maps specify the hostname, the selector, and the path to the private key.
#
# DKIM ADSP and DMARC both only support policies where the signing domain matches
# the From address, so the KeyTable must specify that the signing domain for a
# sender matches the sender's domain.
#
# In SigningTable, we map every email address to a key record named after the domain.
# Then we specify for the key record its domain, selector, and key.
opendkim_key_file = os.path.join(env['STORAGE_ROOT'], 'mail/dkim/mail.private')
if not os.path.exists(opendkim_key_file): return
with open("/etc/opendkim/KeyTable", "w") as f:
f.write("\n".join(
"{domain} {domain}:mail:{key_file}".format(domain=domain, key_file=opendkim_key_file)
for domain, zonefile in zonefiles
))
if not os.path.exists(opendkim_key_file):
# Looks like OpenDKIM is not installed.
return False
with open("/etc/opendkim/SigningTable", "w") as f:
f.write("\n".join(
"*@{domain} {domain}".format(domain=domain)
config = {
# The SigningTable maps email addresses to a key in the KeyTable that
# specifies signing information for matching email addresses. Here we
# map each domain to a same-named key.
#
# Elsewhere we set the DMARC policy for each domain such that mail claiming
# to be From: the domain must be signed with a DKIM key on the same domain.
# So we must have a separate KeyTable entry for each domain.
"SigningTable":
"".join(
"*@{domain} {domain}\n".format(domain=domain)
for domain, zonefile in zonefiles
))
),
# The KeyTable specifies the signing domain, the DKIM selector, and the
# path to the private key to use for signing some mail. Per DMARC, the
# signing domain must match the sender's From: domain.
"KeyTable":
"".join(
"{domain} {domain}:mail:{key_file}\n".format(domain=domain, key_file=opendkim_key_file)
for domain, zonefile in zonefiles
),
}
did_update = False
for filename, content in config.items():
# Don't write the file if it doesn't need an update.
if os.path.exists("/etc/opendkim/" + filename):
with open("/etc/opendkim/" + filename) as f:
if f.read() == content:
continue
# The contents needs to change.
with open("/etc/opendkim/" + filename, "w") as f:
f.write(content)
did_update = True
# Return whether the files changed. If they didn't change, there's
# no need to kick the opendkim process.
return did_update
########################################################################