def pre_callback(self, ldap, dn, *keys, **options):
pkey = self.obj.get_primary_key_from_dn(dn)
if options.get('force', False):
self.add_message(
messages.ServerRemovalWarning(
message=_("Forcing removal of %(hostname)s") %
dict(hostname=pkey)))
# check the topology errors before and after removal
self.context.topology_connectivity = topology.TopologyConnectivity(
self.api)
if options.get('ignore_topology_disconnect', False):
self.add_message(
messages.ServerRemovalWarning(
message=_("Ignoring topology connectivity errors.")))
else:
self._check_topology_connectivity(
self.context.topology_connectivity, pkey)
# ensure that we are not removing last CA/DNS server, DNSSec master and
# CA renewal master
self._ensure_last_of_role(pkey,
ignore_last_of_role=options.get(
'ignore_last_of_role', False))
if self.api.Command.ca_is_enabled()['result']:
try:
with self.api.Backend.ra_securitydomain as domain_api:
domain_api.delete_domain(pkey, 'KRA')
domain_api.delete_domain(pkey, 'CA')
except Exception as e:
self.add_message(
messages.ServerRemovalWarning(message=_(
"Failed to remove server from security domain: %s" %
e)))
# remove the references to master's ldap/http principals
self._remove_server_principal_references(pkey)
# remove Custodia encryption and signing keys
self._remove_server_custodia_keys(ldap, pkey)
# finally destroy all Kerberos principals
self._remove_server_host_services(ldap, pkey)
# try to clean up the leftover DNS entries
self._cleanup_server_dns_records(pkey)
# try to clean up the DNS config from ldap
self._cleanup_server_dns_config(pkey)
return dn
def _remove_server_host_services(self, ldap, master):
"""
delete server kerberos key and all its svc principals
"""
try:
# do not delete ldap principal if server-del command
# has been called on a machine which is being deleted
# since this will break replication.
# ldap principal to be cleaned later by topology plugin
# necessary changes to a topology plugin are tracked
# under https://pagure.io/freeipa/issue/7359
if master == self.api.env.host:
filter = ('(&(krbprincipalname=*/{}@{})'
'(!(krbprincipalname=ldap/*)))'.format(
master, self.api.env.realm))
else:
filter = '(krbprincipalname=*/{}@{})'.format(
master, self.api.env.realm)
entries = ldap.get_entries(self.api.env.basedn,
ldap.SCOPE_SUBTREE,
filter=filter)
if entries:
entries.sort(key=lambda x: len(x.dn), reverse=True)
for entry in entries:
ldap.delete_entry(entry)
except errors.NotFound:
pass
except Exception as e:
self.add_message(
messages.ServerRemovalWarning(
message=_("Failed to cleanup server principals/keys: "
"%(err)s") % dict(err=e)))
def _remove_server_custodia_keys(self, ldap, master):
"""
Delete all Custodia encryption and signing keys
"""
conn = self.Backend.ldap2
env = self.api.env
# search for memberPrincipal=*/fqdn@realm
member_filter = ldap.make_filter_from_attr('memberPrincipal',
"/{}@{}".format(
master, env.realm),
exact=False,
leading_wildcard=True,
trailing_wildcard=False)
custodia_subtree = DN(env.container_custodia, env.basedn)
try:
entries = conn.get_entries(custodia_subtree,
ldap.SCOPE_SUBTREE,
filter=member_filter)
for entry in entries:
conn.delete_entry(entry)
except errors.NotFound:
pass
except Exception as e:
self.add_message(
messages.ServerRemovalWarning(
message=_("Failed to clean up Custodia keys for "
"%(master)s: %(err)s") %
dict(master=master, err=e)))
def exc_callback(self, keys, options, exc, call_func, *call_args,
**call_kwargs):
if (options.get('force', False) and isinstance(exc, errors.NotFound)
and call_func.__name__ == 'delete_entry'):
self.add_message(message=messages.ServerRemovalWarning(
message=_("Server has already been deleted")))
return
raise exc
def _cleanup_server_dns_records(self, hostname, **options):
if not self.api.Command.dns_is_enabled(**options):
return
try:
bindinstance.remove_master_dns_records(hostname,
self.api.env.realm)
dnskeysyncinstance.remove_replica_public_keys(hostname)
except Exception as e:
self.add_message(
messages.ServerRemovalWarning(
message=_("Failed to cleanup %(hostname)s DNS entries: "
"%(err)s") % dict(hostname=hostname, err=e)))
self.add_message(
messages.ServerRemovalWarning(
message=_("You may need to manually remove them from the "
"tree")))
def handler(msg, ignore_last_of_role):
if ignore_last_of_role:
self.add_message(
messages.ServerRemovalWarning(
message=msg
)
)
else:
raise errors.ServerRemovalError(reason=_(msg))
def pre_callback(self, ldap, dn, *keys, **options):
pkey = self.obj.get_primary_key_from_dn(dn)
if options.get('force', False):
self.add_message(
messages.ServerRemovalWarning(
message=_("Forcing removal of %(hostname)s") %
dict(hostname=pkey)))
# check the topology errors before and after removal
self.context.topology_connectivity = topology.TopologyConnectivity(
self.api)
if options.get('ignore_topology_disconnect', False):
self.add_message(
messages.ServerRemovalWarning(
message=_("Ignoring topology connectivity errors.")))
else:
self._check_topology_connectivity(
self.context.topology_connectivity, pkey)
# ensure that we are not removing last CA/DNS server, DNSSec master and
# CA renewal master
self._ensure_last_of_role(pkey,
ignore_last_of_role=options.get(
'ignore_last_of_role', False))
# remove the references to master's ldap/http principals
self._remove_server_principal_references(pkey)
# remove Custodia encryption and signing keys
self._remove_server_custodia_keys(ldap, pkey)
# finally destroy all Kerberos principals
self._remove_server_host_services(ldap, pkey)
# try to clean up the leftover DNS entries
self._cleanup_server_dns_records(pkey)
return dn
def _remove_server_host_services(self, ldap, master):
"""
delete server kerberos key and all its svc principals
"""
try:
entries = ldap.get_entries(
self.api.env.basedn, ldap.SCOPE_SUBTREE,
filter='(krbprincipalname=*/{}@{})'.format(
master, self.api.env.realm))
if entries:
entries.sort(key=lambda x: len(x.dn), reverse=True)
for entry in entries:
ldap.delete_entry(entry)
except errors.NotFound:
pass
except Exception as e:
self.add_message(
messages.ServerRemovalWarning(
message=_("Failed to cleanup server principals/keys: "
"%(err)s") % dict(err=e)))
def wait_for_segment_removal(hostname, master_cns, suffix_name,
orig_errors, new_errors):
i = 0
while True:
left = self.api.Command.topologysegment_find(
suffix_name,
iparepltoposegmentleftnode=hostname,
sizelimit=0)['result']
right = self.api.Command.topologysegment_find(
suffix_name,
iparepltoposegmentrightnode=hostname,
sizelimit=0)['result']
# Relax check if topology was or is disconnected. Disconnected
# topology can contain segments with already deleted servers
# Check only if segments of servers, which can contact this
# server, and the deleted server were removed.
# This code should handle a case where there was a topology
# with a central node(B): A <-> B <-> C, where A is current
# server. After removal of B, topology will be disconnected and
# removal of segment B <-> C won't be replicated back to server
# A, therefore presence of the segment has to be ignored.
if orig_errors or new_errors:
# use errors after deletion because we don't care if some
# server can't contact the deleted one
cant_contact_me = [
e[0] for e in new_errors if starting_host in e[2]
]
can_contact_me = set(master_cns) - set(cant_contact_me)
left = [
s for s in left if s['iparepltoposegmentrightnode'][0]
in can_contact_me
]
right = [
s for s in right
if s['iparepltoposegmentleftnode'][0] in can_contact_me
]
if not left and not right:
self.add_message(
messages.ServerRemovalInfo(
message=_("Agreements deleted")))
return
time.sleep(2)
if i == 2: # taking too long, something is wrong, report
logger.info(
"Waiting for removal of replication agreements")
if i > 90:
logger.info("Taking too long, skipping")
logger.info("Following segments were not deleted:")
self.add_message(
messages.ServerRemovalWarning(
message=_("Following segments were not deleted:")))
for s in left:
self.add_message(
messages.ServerRemovalWarning(message=u" %s" %
s['cn'][0]))
for s in right:
self.add_message(
messages.ServerRemovalWarning(message=u" %s" %
s['cn'][0]))
return
i += 1
def _remove_server_principal_references(self, master):
"""
This method removes information about the replica in parts
of the shared tree that expose it, so clients stop trying to
use this replica.
"""
conn = self.Backend.ldap2
env = self.api.env
master_principal = "{}@{}".format(master, env.realm).encode('utf-8')
# remove replica memberPrincipal from s4u2proxy configuration
s4u2proxy_subtree = DN(env.container_s4u2proxy, env.basedn)
dn1 = DN(('cn', 'ipa-http-delegation'), s4u2proxy_subtree)
member_principal1 = b"HTTP/%s" % master_principal
dn2 = DN(('cn', 'ipa-ldap-delegation-targets'), s4u2proxy_subtree)
member_principal2 = b"ldap/%s" % master_principal
dn3 = DN(('cn', 'ipa-cifs-delegation-targets'), s4u2proxy_subtree)
member_principal3 = b"cifs/%s" % master_principal
for (dn, member_principal) in ((dn1, member_principal1),
(dn2, member_principal2),
(dn3, member_principal3)):
try:
mod = [(ldap.MOD_DELETE, 'memberPrincipal', member_principal)]
conn.conn.modify_s(str(dn), mod)
except (ldap.NO_SUCH_OBJECT, ldap.NO_SUCH_ATTRIBUTE):
logger.debug(
"Replica (%s) memberPrincipal (%s) not found in %s",
master, member_principal.decode('utf-8'), dn)
except Exception as e:
self.add_message(
messages.ServerRemovalWarning(
message=_("Failed to clean memberPrincipal "
"%(principal)s from s4u2proxy entry %(dn)s: "
"%(err)s") %
dict(principal=(member_principal.decode('utf-8')),
dn=dn,
err=e)))
try:
etc_basedn = DN(('cn', 'etc'), env.basedn)
filter = '(dnaHostname=%s)' % master
entries = conn.get_entries(etc_basedn,
ldap.SCOPE_SUBTREE,
filter=filter)
if len(entries) != 0:
for entry in entries:
conn.delete_entry(entry)
except errors.NotFound:
pass
except Exception as e:
self.add_message(
messages.ServerRemovalWarning(
message=_("Failed to clean up DNA hostname entries for "
"%(master)s: %(err)s") %
dict(master=master, err=e)))
try:
dn = DN(('cn', 'default'), ('ou', 'profile'), env.basedn)
ret = conn.get_entry(dn)
srvlist = ret.single_value.get('defaultServerList', '')
srvlist = srvlist.split()
if master in srvlist:
srvlist.remove(master)
if not srvlist:
del ret['defaultServerList']
else:
ret['defaultServerList'] = ' '.join(srvlist)
conn.update_entry(ret)
except (errors.NotFound, errors.MidairCollision, errors.EmptyModlist):
pass
except Exception as e:
self.add_message(
messages.ServerRemovalWarning(
message=_("Failed to remove server %(master)s from server "
"list: %(err)s") % dict(master=master, err=e)))
def _ensure_last_of_role(self, hostname, ignore_last_of_role=False):
"""
1. When deleting server, check if there will be at least one remaining
DNS and CA server.
2. Pick CA renewal master
"""
def handler(msg, ignore_last_of_role):
if ignore_last_of_role:
self.add_message(messages.ServerRemovalWarning(message=msg))
else:
raise errors.ServerRemovalError(reason=_(msg))
ipa_config = self.api.Command.config_show()['result']
ipa_masters = ipa_config['ipa_master_server']
# skip these checks if the last master is being removed
if len(ipa_masters) <= 1:
return
if self.api.Command.dns_is_enabled()['result']:
dns_config = self.api.Command.dnsconfig_show()['result']
dns_servers = dns_config.get('dns_server_server', [])
dnssec_keymaster = dns_config.get('dnssec_key_master_server', [])
if dnssec_keymaster == hostname:
handler(
_("Replica is active DNSSEC key master. Uninstall "
"could break your DNS system. Please disable or "
"replace DNSSEC key master first."), ignore_last_of_role)
if dns_servers == [hostname]:
handler(
_("Deleting this server will leave your installation "
"without a DNS."), ignore_last_of_role)
if self.api.Command.ca_is_enabled()['result']:
try:
vault_config = self.api.Command.vaultconfig_show()['result']
kra_servers = vault_config.get('kra_server_server', [])
except errors.InvocationError:
# KRA is not configured
pass
else:
if kra_servers == [hostname]:
handler(
_("Deleting this server is not allowed as it would "
"leave your installation without a KRA."),
ignore_last_of_role)
ca_servers = ipa_config.get('ca_server_server', [])
ca_renewal_master = ipa_config.get('ca_renewal_master_server', [])
if ca_servers == [hostname]:
handler(
_("Deleting this server is not allowed as it would "
"leave your installation without a CA."),
ignore_last_of_role)
# change the renewal master if there is other master with CA
if ca_renewal_master == hostname:
other_cas = [ca for ca in ca_servers if ca != hostname]
if other_cas:
self.api.Command.config_mod(
ca_renewal_master_server=other_cas[0])
if ignore_last_of_role:
self.add_message(
messages.ServerRemovalWarning(
message=_("Ignoring these warnings and proceeding with "
"removal")))
