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Add LDAP feature support
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@davidpil2002
davidpil2002 committed Oct 23, 2023
1 parent 3022c1b commit a62b5a0
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Showing 6 changed files with 391 additions and 9 deletions.
224 changes: 218 additions & 6 deletions scripts/hostcfgd
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,10 @@ from sonic_py_common.general import check_output_pipe
from swsscommon.swsscommon import ConfigDBConnector, DBConnector, Table
from swsscommon import swsscommon
from sonic_installer import bootloader
hostcfg_file_path = os.path.abspath(__file__)
hostcfg_dir_path = os.path.dirname(hostcfg_file_path)
sys.path.append(hostcfg_dir_path)
import ldap

# FILE
PAM_AUTH_CONF = "/etc/pam.d/common-auth-sonic"
Expand All @@ -31,6 +35,16 @@ NSS_RADIUS_CONF = "/etc/radius_nss.conf"
NSS_RADIUS_CONF_TEMPLATE = "/usr/share/sonic/templates/radius_nss.conf.j2"
PAM_RADIUS_AUTH_CONF_TEMPLATE = "/usr/share/sonic/templates/pam_radius_auth.conf.j2"
NSS_CONF = "/etc/nsswitch.conf"
LDAP_CONF_TEMPLATE = "/usr/share/sonic/templates/ldap.conf.j2"
LDAP_CONF = "/etc/ldap/ldap.conf"
NSLCD_CONF_TEMPLATE = "/usr/share/sonic/templates/nslcd.conf.j2"
NSLCD_CONF = "/etc/nslcd.conf"
PAM_SESSION_CONF = "/etc/pam.d/common-session"
PAM_SESSION_NONINT_CONF = "/etc/pam.d/common-session-noninteractive"
PAM_SESSION_LAST_LINE = '# end of pam-auth-update config'
MKHOME_DIR_RULE = 'session required pam_mkhomedir.so skel=/etc/skel/ umask=0022 silent'
MKHOME_DIR_LIB = 'pam_mkhomedir.so'
MKHOME_DIR_LIB_REG = r'.*pam_mkhomedir'
ETC_PAMD_SSHD = "/etc/pam.d/sshd"
ETC_PAMD_LOGIN = "/etc/pam.d/login"
ETC_LOGIN_DEF = "/etc/login.defs"
Expand Down Expand Up @@ -147,6 +161,79 @@ def obfuscate(data):
return data


def run_cmd_output_custom_log(cmd, custom_log_func=None):
syslog.syslog(syslog.LOG_INFO, "run_cmd_output_custom_log - Executing cmd: {}".format(cmd))
cmd_output = b''
try:
if not isinstance(cmd, list):
raise TypeError(f'{cmd} is not list')
cmd_output = subprocess.check_output(cmd)
syslog.syslog(syslog.LOG_INFO, f"cmd_output: {cmd_output.decode()}")
except subprocess.CalledProcessError as err:
err_log_msg = f"cmd: {err.cmd}, return code: {err.returncode}, output: {err.output}"
if not custom_log_func:
syslog.syslog(syslog.LOG_ERR, err_log_msg)
else:
custom_log_func(err, err_log_msg)
cmd_output = err.output

return cmd_output


def generate_file_from_template(template_j2, file_conf_output, permission, kwargs):
try:
syslog.syslog(syslog.LOG_INFO, f'generate_file_from_template template_j2={template_j2}'
f'file_conf_output={file_conf_output} kwargs={kwargs}')
template_j2_abspath = os.path.abspath(template_j2)
env = jinja2.Environment(loader=jinja2.FileSystemLoader('/'), trim_blocks=True)
env.filters['sub'] = sub
template_j2_ob = env.get_template(template_j2_abspath)
file_conf = template_j2_ob.render(**kwargs)

with open(file_conf_output + ".tmp", 'w') as f:
f.write(file_conf)
os.chmod(file_conf_output + ".tmp", permission)
os.rename(file_conf_output + ".tmp", file_conf_output)
except Exception as e:
log_msg = f'Failed generate_file_from_template error={e}'
syslog.syslog(syslog.LOG_ERR, log_msg)

def custom_service_en_log_func(err, err_log_msg):
"""
function checks if there are some log messages from cmd
that decided to modify the log level to INFO instead ERROR.
"""
# Omit error response when checking if a service is enabled.
syslog.syslog(syslog.LOG_DEBUG, f"err: {err}, err_log_msg: {err_log_msg}")
if 'is-enabled' in err.cmd and 'masked' in err.output.decode():
syslog.syslog(syslog.LOG_INFO, err_log_msg)
else:
syslog.syslog(syslog.LOG_ERR, err_log_msg)

def restart_service(service_name):
cmd_service_return = run_cmd_output_custom_log(['systemctl', 'is-enabled', service_name], custom_service_en_log_func)
if 'masked' in cmd_service_return.decode():
syslog.syslog(syslog.LOG_DEBUG, f"{service_name}: unmask & starting")
run_cmd_output_custom_log(['systemctl', 'unmask', service_name])
run_cmd_output_custom_log(['systemctl', 'start', service_name])
else:
syslog.syslog(syslog.LOG_DEBUG, f"{service_name}: restarting")
run_cmd_output_custom_log(['systemctl', 'restart', service_name])


def handle_nslcd_service(is_ldap_config_complete):
if is_ldap_config_complete:
# nslcd service should be restart after any ldap configuration.
restart_service("nslcd")
else:
# stopping nslcd service when Ldap feature disabled
cmd_nslcd_return = run_cmd_output_custom_log(['systemctl', 'is-enabled', 'nslcd'], custom_service_en_log_func)
if 'enabled' in cmd_nslcd_return.decode():
syslog.syslog(syslog.LOG_DEBUG, "nslcd: deactivating (Ldap disabled)")
run_cmd_output_custom_log(['systemctl', 'stop', 'nslcd'])
run_cmd_output_custom_log(['systemctl', 'mask', 'nslcd'])


def get_pid(procname):
for dirname in os.listdir('/proc'):
if dirname == 'curproc':
Expand All @@ -161,6 +248,18 @@ def get_pid(procname):
return ""


def is_match(pattern, file_path):
syslog.syslog(syslog.LOG_DEBUG, "looking for pattern {} line in file {}".format(pattern, file_path))
res_match = False
with open(file_path, 'r') as f:
for (i, line) in enumerate(f):
if re.match(pattern, line):
syslog.syslog(syslog.LOG_INFO, "matched pattern {} in line {}".format(pattern, str(i)))
res_match = True
break
return res_match


class Iptables(object):
def __init__(self):
'''
Expand Down Expand Up @@ -265,6 +364,10 @@ class AaaCfg(object):
self.radius_global = {}
self.radius_servers = {}

self.ldap_global_default = {}
self.ldap_global = {}
self.ldap_servers = {}

self.authentication = {}
self.authorization = {}
self.accounting = {}
Expand All @@ -274,7 +377,7 @@ class AaaCfg(object):
self.hostname = ""

# Load conf from ConfigDb
def load(self, aaa_conf, tac_global_conf, tacplus_conf, rad_global_conf, radius_conf):
def load(self, aaa_conf, tac_global_conf, tacplus_conf, rad_global_conf, radius_conf, ldap_global_conf, ldap_conf):
for row in aaa_conf:
self.aaa_update(row, aaa_conf[row], modify_conf=False)
for row in tac_global_conf:
Expand All @@ -287,6 +390,11 @@ class AaaCfg(object):
for row in radius_conf:
self.radius_server_update(row, radius_conf[row], modify_conf=False)

for row in ldap_global_conf:
self.ldap_global_update(row, ldap_global_conf[row], modify_conf=False)
for row in ldap_conf:
self.ldap_server_update(row, ldap_conf[row], modify_conf=False)

self.modify_conf_file()

def aaa_update(self, key, data, modify_conf=True):
Expand All @@ -302,6 +410,17 @@ class AaaCfg(object):
self.accounting = data
if modify_conf:
self.modify_conf_file()

if key == 'authentication':
# Enable/Disable LDAP service (nslcd) according LDAP configuration.
handle_nslcd_service(self.is_ldap_config_complete())

def is_ldap_config_complete(self):
if self.ldap_global == {}:
return False
return self.ldap_global.get('bind_dn', "") and self.ldap_global.get('base_dn', "") and \
self.ldap_global.get('bind_password', "") and 'ldap' in self.authentication['login'] and \
self.ldap_servers

def pick_src_intf_ipaddrs(self, keys, src_intf):
new_ipv4_addr = ""
Expand Down Expand Up @@ -404,6 +523,25 @@ class AaaCfg(object):
if modify_conf:
self.modify_conf_file()

def ldap_global_update(self, key, data, modify_conf=True):
if key == 'global':
self.ldap_global = data

if modify_conf:
self.modify_conf_file()
handle_nslcd_service(self.is_ldap_config_complete())

def ldap_server_update(self, key, data, modify_conf=True):
if data == {}:
if key in self.ldap_servers:
del self.ldap_servers[key]
else:
self.ldap_servers[key] = data

if modify_conf:
self.modify_conf_file()
handle_nslcd_service(self.is_ldap_config_complete())

def hostname_update(self, hostname, modify_conf=True):
if self.hostname == hostname:
return
Expand Down Expand Up @@ -468,7 +606,6 @@ class AaaCfg(object):

syslog.syslog(syslog.LOG_INFO, "file size check pass: {} size is ({}) bytes".format(filename, size))


def modify_single_file(self, filename, operations=None):
if operations:
e_list = ['-e'] * len(operations)
Expand All @@ -489,6 +626,9 @@ class AaaCfg(object):
accounting.update(self.accounting)
tacplus_global = self.tacplus_global_default.copy()
tacplus_global.update(self.tacplus_global)
ldap_global = self.ldap_global_default.copy()
ldap_global.update(self.ldap_global)

if 'src_ip' in tacplus_global:
src_ip = tacplus_global['src_ip']
else:
Expand Down Expand Up @@ -541,10 +681,23 @@ class AaaCfg(object):
radsrvs_conf.append(server)
radsrvs_conf = sorted(radsrvs_conf, key=lambda t: int(t['priority']), reverse=True)

# LDAP server configuration
ldapsrvs_conf = []
if self.ldap_servers:
for addr in self.ldap_servers:
server = ldap_global.copy()
server['ip'] = addr
server.update(self.ldap_servers[addr])
ldapsrvs_conf.append(server)
ldapsrvs_conf = sorted(ldapsrvs_conf, key=lambda t: int(t['priority']), reverse=True)

template_file = os.path.abspath(PAM_AUTH_CONF_TEMPLATE)
env = jinja2.Environment(loader=jinja2.FileSystemLoader('/'), trim_blocks=True)
env.filters['sub'] = sub
template = env.get_template(template_file)

if 'ldap' in authentication['login']:
pam_conf = template.render(debug=self.debug, trace=self.trace, auth=authentication, servers=ldapsrvs_conf)
if 'radius' in authentication['login']:
pam_conf = template.render(debug=self.debug, trace=self.trace, auth=authentication, servers=radsrvs_conf)
else:
Expand All @@ -556,6 +709,17 @@ class AaaCfg(object):
os.chmod(PAM_AUTH_CONF + ".tmp", 0o644)
os.rename(PAM_AUTH_CONF + ".tmp", PAM_AUTH_CONF)

if os.path.isfile(PAM_SESSION_CONF):
# Support to add home directory to LDAP AAA users
if 'ldap' in authentication['login']:
if not is_match(MKHOME_DIR_LIB_REG, PAM_SESSION_CONF):
modify_single_file_inplace(PAM_SESSION_CONF, [f"\'/^{PAM_SESSION_LAST_LINE}/i {MKHOME_DIR_RULE}\'"])
modify_single_file_inplace(PAM_SESSION_NONINT_CONF, [f"\'/^{PAM_SESSION_LAST_LINE}/i {MKHOME_DIR_RULE}\'"])
else: # login without ldap
syslog.syslog(syslog.LOG_DEBUG, f"auth login: not ldap type - rm {MKHOME_DIR_RULE} from {PAM_SESSION_CONF} file.")
modify_single_file_inplace(PAM_SESSION_CONF, [ f"'/{MKHOME_DIR_LIB}/d'" ])
modify_single_file_inplace(PAM_SESSION_NONINT_CONF, [ f"'/{MKHOME_DIR_LIB}/d'" ])

# Modify common-auth include file in /etc/pam.d/login, sshd.
# /etc/pam.d/sudo is not handled, because it would change the existing
# behavior. It can be modified once a config knob is added for sudo.
Expand All @@ -566,19 +730,36 @@ class AaaCfg(object):
self.modify_single_file(ETC_PAMD_SSHD, [ "/^@include/s/common-auth-sonic$/common-auth/" ])
self.modify_single_file(ETC_PAMD_LOGIN, [ "/^@include/s/common-auth-sonic$/common-auth/" ])

# Add tacplus/radius in nsswitch.conf if TACACS+/RADIUS enable
if 'tacacs+' in authentication['login']:
# Add tacplus/radius/ldap in nsswitch.conf if TACACS+/RADIUS enable
if 'tacacs+' in authentication['login'] and servers_conf:
if os.path.isfile(NSS_CONF):
self.modify_single_file(NSS_CONF, [ "/^passwd/s/ radius//" ])
self.modify_single_file(NSS_CONF, [ "/^passwd/s/ ldap//" ])
self.modify_single_file(NSS_CONF, [ "/tacplus/b", "/^passwd/s/compat/tacplus &/", "/^passwd/s/files/tacplus &/" ])
self.modify_single_file(NSS_CONF, [ "/^group/s/ ldap//" ])
self.modify_single_file(NSS_CONF, [ "/^shadow/s/ ldap//" ])

elif 'radius' in authentication['login']:
if os.path.isfile(NSS_CONF):
self.modify_single_file(NSS_CONF, [ "'/^passwd/s/tacplus //'" ])
self.modify_single_file(NSS_CONF, [ "/^passwd/s/tacplus //" ])
self.modify_single_file(NSS_CONF, [ "/^passwd/s/ ldap//" ])
self.modify_single_file(NSS_CONF, [ "/radius/b", "/^passwd/s/compat/& radius/", "/^passwd/s/files/& radius/" ])
self.modify_single_file(NSS_CONF, [ "/^group/s/ ldap//" ])
self.modify_single_file(NSS_CONF, [ "/^shadow/s/ ldap//" ])
elif 'ldap' in authentication['login']:
if os.path.isfile(NSS_CONF):
self.modify_single_file(NSS_CONF, [ "/^passwd/s/tacplus //" ])
self.modify_single_file(NSS_CONF, [ "/^passwd/s/ radius//" ])
self.modify_single_file(NSS_CONF, [ "/ldap/b", "/^passwd/s/compat/& ldap/", "/^passwd/s/files/& ldap/" ])
self.modify_single_file(NSS_CONF, [ "/ldap/b", "/^group/s/compat/& ldap/", "/^group/s/files/& ldap/" ])
self.modify_single_file(NSS_CONF, [ "/ldap/b", "/^shadow/s/compat/& ldap/", "/^shadow/s/files/& ldap/" ])
else:
if os.path.isfile(NSS_CONF):
self.modify_single_file(NSS_CONF, [ "/^passwd/s/tacplus //g" ])
self.modify_single_file(NSS_CONF, [ "/^passwd/s/ radius//" ])
self.modify_single_file(NSS_CONF, [ "/^passwd/s/ ldap//" ])
self.modify_single_file(NSS_CONF, [ "/^group/s/ ldap//" ])
self.modify_single_file(NSS_CONF, [ "/^shadow/s/ ldap//" ])

# Add tacplus authorization configration in nsswitch.conf
tacacs_authorization_conf = None
Expand Down Expand Up @@ -648,6 +829,19 @@ class AaaCfg(object):
"{} - failed: return code - {}, output:\n{}"
.format(err.cmd, err.returncode, err.output))


# Set NSLCD conf (LDAP)
generate_file_from_template(NSLCD_CONF_TEMPLATE, NSLCD_CONF, 0o640, {'servers': ldapsrvs_conf, 'ldap_cfg': ldap.LdapCfg})

# Set LDAP conf
if not os.path.exists(LDAP_CONF):
try:
os.makedirs(os.path.dirname(LDAP_CONF))
except Exception as err:
syslog.syslog(syslog.LOG_ERR, "Error occurred when using cmd makedirs: {}".format(err))
generate_file_from_template(LDAP_CONF_TEMPLATE, LDAP_CONF, 0o644, {'servers': ldapsrvs_conf, 'ldap_cfg': ldap.LdapCfg})


def modify_single_file_inplace(filename, operations=None):
if operations:
cmd = ["sed", '-i'] + operations + [filename]
Expand Down Expand Up @@ -1500,6 +1694,8 @@ class HostConfigDaemon:
tacacs_server = init_data['TACPLUS_SERVER']
radius_global = init_data['RADIUS']
radius_server = init_data['RADIUS_SERVER']
ldap_global = init_data['LDAP']
ldap_server = init_data['LDAP_SERVER']
lpbk_table = init_data['LOOPBACK_INTERFACE']
ntp_server = init_data['NTP_SERVER']
ntp_global = init_data['NTP']
Expand All @@ -1514,7 +1710,7 @@ class HostConfigDaemon:
dns = init_data.get('DNS_NAMESERVER', {})
fips_cfg = init_data.get('FIPS', {})

self.aaacfg.load(aaa, tacacs_global, tacacs_server, radius_global, radius_server)
self.aaacfg.load(aaa, tacacs_global, tacacs_server, radius_global, radius_server, ldap_global, ldap_server)
self.iptables.load(lpbk_table)
self.ntpcfg.load(ntp_global, ntp_server)
self.kdumpCfg.load(kdump)
Expand Down Expand Up @@ -1577,6 +1773,20 @@ class HostConfigDaemon:
log_data['passkey'] = obfuscate(log_data['passkey'])
syslog.syslog(syslog.LOG_INFO, 'RADIUS Global update: key: {}, op: {}, data: {}'.format(key, op, log_data))

def ldap_global_handler(self, key, op, data):
self.aaacfg.ldap_global_update(key, data)
log_data = copy.deepcopy(data)
if 'passkey' in log_data:
log_data['passkey'] = obfuscate(log_data['passkey'])
syslog.syslog(syslog.LOG_INFO, 'LDAP Global update: key: {}, op: {}, data: {}'.format(key, op, log_data))

def ldap_server_handler(self, key, op, data):
self.aaacfg.ldap_server_update(key, data)
log_data = copy.deepcopy(data)
if 'passkey' in log_data:
log_data['passkey'] = obfuscate(log_data['passkey'])
syslog.syslog(syslog.LOG_INFO, 'LDAP_SERVER update: key: {}, op: {}, data: {}'.format(key, op, log_data))

def mgmt_intf_handler(self, key, op, data):
key = ConfigDBConnector.deserialize_key(key)
mgmt_intf_name = self.__get_intf_name(key)
Expand Down Expand Up @@ -1678,6 +1888,8 @@ class HostConfigDaemon:
self.config_db.subscribe('TACPLUS_SERVER', make_callback(self.tacacs_server_handler))
self.config_db.subscribe('RADIUS', make_callback(self.radius_global_handler))
self.config_db.subscribe('RADIUS_SERVER', make_callback(self.radius_server_handler))
self.config_db.subscribe('LDAP', make_callback(self.ldap_global_handler))
self.config_db.subscribe('LDAP_SERVER', make_callback(self.ldap_server_handler))
self.config_db.subscribe('PASSW_HARDENING', make_callback(self.passwh_handler))
self.config_db.subscribe('SSH_SERVER', make_callback(self.ssh_handler))
# Handle IPTables configuration
Expand Down
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