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authorChristian Poessinger <christian@poessinger.com>2018-06-04 19:08:20 +0200
committerChristian Poessinger <christian@poessinger.com>2018-06-04 20:22:37 +0200
commit6900ac9213903f239f915624553d986f4fdbe0d4 (patch)
treeb4bba51d210587dd8540478613f819ef2d4249f6 /src/conf_mode/snmp.py
parent3f553cf6effe76cafb031051b3aa3ca87e7b84a1 (diff)
downloadvyos-1x-6900ac9213903f239f915624553d986f4fdbe0d4.tar.gz
vyos-1x-6900ac9213903f239f915624553d986f4fdbe0d4.zip
T652: Add SNMPv3 TSM handling and commit verification
Diffstat (limited to 'src/conf_mode/snmp.py')
-rwxr-xr-xsrc/conf_mode/snmp.py151
1 files changed, 129 insertions, 22 deletions
diff --git a/src/conf_mode/snmp.py b/src/conf_mode/snmp.py
index ef7ac12fc..429181550 100755
--- a/src/conf_mode/snmp.py
+++ b/src/conf_mode/snmp.py
@@ -18,12 +18,14 @@
import sys
import os
+import stat
+import pwd
import jinja2
import ipaddress
import random
import binascii
-import os
+import re
import vyos.version
@@ -104,7 +106,11 @@ monitor -r 10 -e linkDownTrap "Generate linkDown" ifOperStatus == 2
# configurable section #
########################
-# Version
+{% if v3_tsm_key %}
+[snmp] localCert {{ v3_tsm_key }}
+{% endif %}
+
+# Default system description is VyOS version
sysDescr VyOS {{ version }}
{% if description -%}
@@ -113,7 +119,7 @@ SysDescr {{ description }}
{% endif %}
# Listen
-agentaddress unix:/run/snmpd.socket{% for li in listen_on %},{{ li }}{% endfor %}
+agentaddress unix:/run/snmpd.socket{% for li in listen_on %},{{ li }}{% endfor %}{% if v3_tsm_key %},tlstcp:{{ v3_tsm_port }},dtlsudp::{{ v3_tsm_port }}{% endif %}
# SNMP communities
@@ -179,7 +185,7 @@ access {{ g.name }} "" tsm {{ g.seclevel }} exact {{ g.view }} none none
# trap-target
{% if v3_traps -%}
{% for t in v3_traps %}
-trapsess -v 3 -e {{ t.engineID }} -u {{ t.secName }} -l {{ t.secLevel }} -a {{ t.authProtocol }} {% if t.authPassword %}-A {{ t.authPassword }}{% elif t.authMasterKey %}-3m {{ t.authMasterKey }}{% endif %} -x {{ t.privProtocol }} {% if t.privPassword %}-X {{ t.privPassword }}{% elif t.privMasterKey %}-3M {{ t.privMasterKey }}{% endif %} {{ t.ipProto }}:{{ t.ipAddr }}:{{ t.ipPort }}
+trapsess -v 3 {{ '-Ci' if t.type == 'inform' }} -e {{ t.engineID }} -u {{ t.secName }} -l {{ t.secLevel }} -a {{ t.authProtocol }} {% if t.authPassword %}-A {{ t.authPassword }}{% elif t.authMasterKey %}-3m {{ t.authMasterKey }}{% endif %} -x {{ t.privProtocol }} {% if t.privPassword %}-X {{ t.privPassword }}{% elif t.privMasterKey %}-3M {{ t.privMasterKey }}{% endif %} {{ t.ipProto }}:{{ t.ipAddr }}:{{ t.ipPort }}
{% endfor -%}
{% endif %}
@@ -217,6 +223,10 @@ default_config_data = {
'v3_views': []
}
+def rmfile(file):
+ if os.path.isfile(file):
+ os.unlink(file)
+
def get_config():
snmp = default_config_data
conf = Config()
@@ -408,12 +418,7 @@ def get_config():
trap_cfg['ipPort'] = conf.return_value('v3 trap-target {0} port'.format(trap))
if conf.exists('v3 trap-target {0} type'.format(trap)):
- tmp = conf.return_value('v3 trap-target {0} type'.format(trap))
- # see http://www.net-snmp.org/docs/man/snmpd.conf.html
- # The option -Ci can be used (with -v2c or -v3) to generate an INFORM
- # notification rather than an unacknowledged TRAP.
- if tmp == 'inform':
- trap_cfg['type'] = ' -Ci'
+ trap_cfg['type'] = conf.return_value('v3 trap-target {0} type'.format(trap))
# Determine securityLevel used for SNMPv3 messages (noAuthNoPriv|authNoPriv|authPriv).
# Appropriate pass phrase(s) must provided when using any level higher than noAuthNoPriv.
@@ -444,14 +449,14 @@ def get_config():
'name': user,
'authMasterKey': '',
'authPassword': '',
- 'authProtocol': 'md5',
+ 'authProtocol': '',
'engineID': '',
'group': '',
'mode': 'ro',
'privMasterKey': '',
'privPassword': '',
'privTsmKey': '',
- 'privProtocol': 'des'
+ 'privProtocol': ''
}
#
@@ -525,24 +530,117 @@ def verify(snmp):
if snmp is None:
return None
+ # bail out early if SNMP v3 is not configured
+ if not snmp['v3_enabled']:
+ return None
+
+ tsmKeyPattern = re.compile('^[0-9A-F]{2}(:[0-9A-F]{2}){19}$', re.IGNORECASE)
+
+ if snmp['v3_tsm_key']:
+ if not tsmKeyPattern.match(snmp['v3_tsm_key']):
+ if not os.path.isfile('/etc/snmp/tls/certs/' + snmp['v3_tsm_key']):
+ if not os.path.isfile('/config/snmp/tls/certs/' + snmp['v3_tsm_key']):
+ raise ConfigError('TSM key must be fingerprint or filename in "/config/snmp/tls/certs/" folder')
+
+ if 'v3_groups' in snmp.keys():
+ for group in snmp['v3_groups']:
+ #
+ # A view must exist prior to mapping it into a group
+ #
+ if 'view' in group.keys():
+ error = True
+ if 'v3_views' in snmp.keys():
+ for view in snmp['v3_views']:
+ if view['name'] == group['view']:
+ error = False
+ if error:
+ raise ConfigError('You must create view "{0}" first'.format(group['view']))
+ else:
+ raise ConfigError('"view" must be specified')
+
+ if not 'mode' in group.keys():
+ raise ConfigError('"mode" must be specified')
+
+ if not 'seclevel' in group.keys():
+ raise ConfigError('"seclevel" must be specified')
+
+
if 'v3_traps' in snmp.keys():
for trap in snmp['v3_traps']:
if trap['authPassword'] and trap['authMasterKey']:
- raise ConfigError('Can not mix "encrypted-key" and "plaintext-key" for trap auth')
+ raise ConfigError('Must specify only one of encrypted-key/plaintext-key for trap auth')
+
+ if trap['authPassword'] == '' and trap['authMasterKey'] == '':
+ raise ConfigError('Must specify encrypted-key or plaintext-key for trap auth')
+
if trap['privPassword'] and trap['privMasterKey']:
- raise ConfigError('Can not mix "encrypted-key" and "plaintext-key" for trap privacy')
+ raise ConfigError('Must specify only one of encrypted-key/plaintext-key for trap privacy')
+
+ if trap['privPassword'] == '' and trap['privMasterKey'] == '':
+ raise ConfigError('Must specify encrypted-key or plaintext-key for trap privacy')
+
+ if not 'type' in trap.keys():
+ raise ConfigError('v3 trap: "type" must be specified')
+
+ if not 'authPassword' and 'authMasterKey' in trap.keys():
+ raise ConfigError('v3 trap: "auth" must be specified')
+
+ if not 'authProtocol' in trap.keys():
+ raise ConfigError('v3 trap: "protocol" must be specified')
+
+ if not 'privPassword' and 'privMasterKey' in trap.keys():
+ raise ConfigError('v3 trap: "user" must be specified')
+
+ if 'type' in trap.keys():
+ if trap['type'] == 'trap' and trap['engineID'] == '':
+ raise ConfigError('must specify engineid if type is "trap"')
+ else:
+ raise ConfigError('"type" must be specified')
+
if 'v3_users' in snmp.keys():
for user in snmp['v3_users']:
if user['authPassword'] and user['authMasterKey']:
raise ConfigError('Can not mix "encrypted-key" and "plaintext-key" for user auth')
+
if user['privPassword'] and user['privMasterKey']:
raise ConfigError('Can not mix "encrypted-key" and "plaintext-key" for user privacy')
- if 'v3_group' in snmp.keys():
- for group in snmp['v3_group']:
- if not group['view']:
- raise ConfigError('You must create a view first')
+ if user['privPassword'] == '' and user['privMasterKey'] == '':
+ raise ConfigError('Must specify encrypted-key or plaintext-key for user privacy')
+
+ if user['authPassword'] == '' and user['authMasterKey'] == '' and user['privTsmKey'] == '':
+ raise ConfigError('Must specify auth or tsm-key for user auth')
+
+ if user['privProtocol'] == '':
+ raise ConfigError('Must specify privacy type')
+
+ if user['mode'] == '':
+ raise ConfigError('Must specify user mode ro/rw')
+
+ if user['privTsmKey']:
+ if not tsmKeyPattern.match(snmp['v3_tsm_key']):
+ if not os.path.isfile('/etc/snmp/tls/certs/' + snmp['v3_tsm_key']):
+ if not os.path.isfile('/config/snmp/tls/certs/' + snmp['v3_tsm_key']):
+ raise ConfigError('User TSM key must be fingerprint or filename in "/config/snmp/tls/certs/" folder')
+
+ if user['group']:
+ #
+ # Group must exist prior to mapping it into a group
+ #
+ error = True
+ if 'v3_groups' in snmp.keys():
+ for group in snmp['v3_groups']:
+ if group['name'] == user['group']:
+ error = False
+ if error:
+ raise ConfigError('You must create group "{0}" first'.format(user['group']))
+
+
+ if 'v3_views' in snmp.keys():
+ for view in snmp['v3_views']:
+ if not view['oids']:
+ raise ConfigError('Must configure an oid')
return None
@@ -551,10 +649,10 @@ def generate(snmp):
# As we are manipulating the snmpd user database we have to stop it first!
# This is even save if service is going to be removed
os.system("sudo systemctl stop snmpd.service")
- os.unlink(config_file_client)
- os.unlink(config_file_daemon)
- os.unlink(config_file_access)
- os.unlink(config_file_user)
+ rmfile(config_file_client)
+ rmfile(config_file_daemon)
+ rmfile(config_file_access)
+ rmfile(config_file_user)
if snmp is None:
return None
@@ -587,6 +685,15 @@ def generate(snmp):
def apply(snmp):
if snmp is not None:
+
+ if not os.path.exists('/config/snmp/tls'):
+ os.makedirs('/config/snmp/tls')
+ os.chmod('/config/snmp/tls', stat.S_IWUSR | stat.S_IRUSR)
+ # get uid for user 'snmp'
+ snmp_uid = pwd.getpwnam('snmp').pw_uid
+ os.chown('/config/snmp/tls', snmp_uid, -1)
+
+ # start SNMP daemon
os.system("sudo systemctl restart snmpd.service")
return None