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infrastructure/app/secretmgr.py

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#!/usr/bin/env python3
# DEPENDENCY: python-consul
import consul
# DEPENDENCY: python-ldap
import ldap
# DEPENDENCY: passlib
from passlib.hash import ldap_salted_sha1
import os
import sys
import glob
import subprocess
import getpass
import base64
from secrets import token_bytes
"""
TODO: this will be a utility to handle secrets in the Consul database
for the various components of the Deuxfleurs infrastructure
Functionnalities:
- check that secrets are correctly configured
- help user fill in secrets
- create LDAP service users and fill in corresponding secrets
- maybe one day: manage SSL certificates and keys
It uses files placed in <module_name>/secrets/* to know what secrets
it should handle. These secret files contain directives for what to do
about these secrets.
Example directives:
USER <description>
(a secret that must be filled in by the user)
USER_LONG <description>
(the same, indicates that the secret fits on several lines)
CMD <command>
(a secret that is generated by running this command)
CONST <constant value>
(the secret has a constant value set here)
CONST_LONG
<constant value, several lines>
(same)
SERVICE_DN <service name> <service description>
(the LDAP DN of a service user)
SERVICE_PASSWORD <service name>
(the LDAP password for the corresponding service user)
SSL_CERT <cert name> <list of domains>
(a SSL domain for the given domains)
SSL_KEY <cert name>
(the SSL key going with corresponding certificate)
RSA_PUBLIC_KEY <key name> <key description>
(a public RSA key)
RSA_PRIVATE_KEY <key name>
(the corresponding private RSA key)
"""
# Parameters
LDAP_URL = "ldap://localhost:1389"
SERVICE_DN_SUFFIX = "ou=services,ou=users,dc=deuxfleurs,dc=fr"
consul_server = consul.Consul()
# ----
USER = "USER"
USER_LONG = "USER_LONG"
CMD = "CMD"
CONST = "CONST"
CONST_LONG = "CONST_LONG"
SERVICE_DN = "SERVICE_DN"
SERVICE_PASSWORD = "SERVICE_PASSWORD"
SSL_CERT = "SSL_CERT"
SSL_KEY = "SSL_KEY"
RSA_PUBLIC_KEY = "RSA_PUBLIC_KEY"
RSA_PRIVATE_KEY = "RSA_PRIVATE_KEY"
class bcolors:
HEADER = '\033[95m'
OKBLUE = '\033[94m'
OKCYAN = '\033[96m'
OKGREEN = '\033[92m'
WARNING = '\033[93m'
FAIL = '\033[91m'
ENDC = '\033[0m'
BOLD = '\033[1m'
UNDERLINE = '\033[4m'
def read_secret(key, file_path):
lines = [l.strip() for l in open(file_path, "r")]
l0 = lines[0].split(" ")
stype = l0[0]
secret = {"type": stype, "key": key}
if stype in [USER, USER_LONG]:
secret["desc"] = " ".join(l0[1:])
elif stype == CMD:
secret["cmd"] = " ".join(l0[1:])
elif stype == CONST:
secret["value"] = " ".join(l0[1:])
elif stype == CONST_LONG:
secret["value"] = "\n".join(lines[1:])
elif stype in [SERVICE_DN, SERVICE_PASSWORD]:
secret["service"] = l0[1]
if stype == SERVICE_DN:
secret["service_desc"] = " ".join(l0[2:])
elif stype in [SSL_CERT, SSL_KEY]:
secret["cert_name"] = l0[1]
if stype == SSL_CERT:
secret["cert_domains"] = l0[2:]
elif stype in [RSA_PUBLIC_KEY, RSA_PRIVATE_KEY]:
secret["key_name"] = l0[1]
if stype == RSA_PUBLIC_KEY:
secret["key_desc"] = " ".join(l0[2:])
else:
print(bcolors.FAIL, "ERROR:", bcolors.ENDC, "Invalid secret type", stype, "in", file_path)
sys.exit(-1)
return secret
def read_secrets(module_list):
secrets = {}
for mod in module_list:
for file_path in glob.glob(mod.strip('/') + "/secrets/**", recursive=True):
if os.path.isfile(file_path):
key = '/'.join(file_path.split("/")[1:])
secrets[key] = read_secret(key, file_path)
return secrets
def get_secrets_services(secrets):
services = {}
for key, secret in secrets.items():
if secret["type"] not in [SERVICE_DN, SERVICE_PASSWORD]:
continue
svc = secret["service"]
print(svc, "@", key, bcolors.OKCYAN, "...", bcolors.ENDC)
if svc not in services:
services[svc] = {
"dn": "cn=%s,%s"%(svc, SERVICE_DN_SUFFIX),
"pass": None,
"dn_at": [],
"pass_at": [],
}
if secret["type"] == SERVICE_DN:
services[svc]["dn_at"].append(key)
services[svc]["desc"] = secret["service_desc"]
if secret["type"] == SERVICE_PASSWORD:
services[svc]["pass_at"].append(key)
_, data = consul_server.kv.get(key)
if data is not None:
if services[svc]["pass"] is None:
services[svc]["pass"] = data["Value"].decode('ascii').strip()
return services
ldap_admin_conn = None
def get_ldap_admin_conn():
global ldap_admin_conn
if ldap_admin_conn is None:
ldap_admin_conn = ldap.initialize(LDAP_URL)
ldap_user = input("LDAP admin user (full DN, please!): ")
ldap_pass = getpass.getpass("LDAP admin password: ")
ldap_admin_conn.simple_bind_s(ldap_user, ldap_pass)
return ldap_admin_conn
# ---- CHECK COMMAND ----
def check_secrets(module_list):
secrets = read_secrets(module_list)
print("Found", len(secrets), "secrets to check")
print()
check_secrets_presence(secrets)
check_secrets_services(secrets)
def check_secrets_presence(secrets):
print("Checking secrets presence...")
for key in secrets.keys():
_, data = consul_server.kv.get(key)
if data is None:
print(key, bcolors.FAIL, "x", bcolors.ENDC)
else:
print(key, bcolors.OKGREEN, "✓", bcolors.ENDC)
print()
def check_secrets_services(secrets):
print("Checking secrets for LDAP service users...")
services = get_secrets_services(secrets)
for svc_name, svc in services.items():
for dn_key in svc["dn_at"]:
_, data = consul_server.kv.get(dn_key)
if data is not None:
got_val = data["Value"].decode('ascii').strip()
if got_val != svc["dn"]:
print(svc_name, "wrong DN at", dn_key, bcolors.FAIL, "x", bcolors.ENDC)
print("got:", got_val, "instead of:", svc["dn"])
if svc["pass"] is None:
print(svc_name, bcolors.FAIL, "no password stored", bcolors.ENDC)
else:
for pass_key in svc["pass_at"]:
_, data = consul_server.kv.get(pass_key)
if data is not None:
got_val = data["Value"].decode('ascii').strip()
if got_val != svc["pass"]:
print(svc_name, "wrong pass at", dn_key, bcolors.FAIL, "x", bcolors.ENDC)
l = ldap.initialize(LDAP_URL)
try:
l.simple_bind_s(svc["dn"], svc["pass"])
print(svc_name, bcolors.OKGREEN, "✓", bcolors.ENDC)
except Exception as e:
print(svc_name, bcolors.FAIL, e, bcolors.ENDC)
print()
# ---- GEN COMMAND ----
def gen_secrets(module_list, regen):
secrets = read_secrets(module_list)
print("Found", len(secrets), "secrets to check and maybe generate")
print()
gen_secrets_base(secrets, regen)
gen_secrets_services(secrets, regen)
check_secrets_presence(secrets)
check_secrets_services(secrets)
def gen_secrets_base(secrets, regen):
print("Filling in user secrets and cmd secrets...")
for key, secret in secrets.items():
_, data = consul_server.kv.get(key)
if data is not None and not regen:
continue
if secret["type"] == USER:
print("----")
print(key)
print("Description:", secret["desc"])
print("Enter value for secret, or ^C to skip:")
try:
val = input().strip()
consul_server.kv.put(key, val)
print(bcolors.OKCYAN, "Value set.", bcolors.ENDC)
except KeyboardInterrupt:
print(bcolors.WARNING, "Skipped.", bcolors.ENDC)
if secret["type"] == USER_LONG:
print("----")
print(key)
print("Description:", secret["desc"])
print("Enter value for secret, or ^C to skip:")
print("THIS IS A LONG VALUE, ENTER SEVERAL LINES AND FINISH WITH A LINE CONTAINING A SINGLE .")
try:
lines = []
while True:
line = input().strip()
if line == ".":
break
vals.append(line)
val = "\n".join(lines)
consul_server.kv.put(key, val)
print(bcolors.OKCYAN, "Value set.", bcolors.ENDC)
except KeyboardInterrupt:
print(bcolors.WARNING, "Skipped.", bcolors.ENDC)
if secret["type"] in [CONST, CONST_LONG]:
print("----")
print(key)
print("Resetting to constant value.")
consul_server.kv.put(key, secret["value"])
print(bcolors.OKCYAN, "Value set.", bcolors.ENDC)
if secret["type"] == CMD:
print("----")
print(key)
print("Executing command:", secret["cmd"])
val = subprocess.check_output(["sh", "-c", secret["cmd"]])
consul_server.kv.put(key, val)
print(bcolors.OKCYAN, "Value set.", bcolors.ENDC)
print()
def gen_secrets_services(secrets, regen):
print("Generating LDAP service accounts...")
services = get_secrets_services(secrets)
for svc_name, svc in services.items():
print("----")
print("Service:", svc_name)
print("Description:", svc["desc"])
for dn_key in svc["dn_at"]:
_, data = consul_server.kv.get(dn_key)
if data is None or data["Value"].decode('ascii').strip() != svc["dn"]:
print(bcolors.OKCYAN, "Setting DN", bcolors.ENDC, "at", dn_key)
consul_server.kv.put(dn_key, svc["dn"])
if svc["pass"] is None or regen:
print(bcolors.OKCYAN, "Generating new password", bcolors.ENDC)
svc["pass"] = base64.urlsafe_b64encode(token_bytes(12)).decode('ascii')
l = ldap.initialize(LDAP_URL)
try:
l.simple_bind_s(svc["dn"], svc["pass"])
except:
fix_service_user(svc)
for pass_key in svc["pass_at"]:
_, data = consul_server.kv.get(pass_key)
if data is None or data["Value"].decode('ascii').strip() != svc["pass"]:
print(bcolors.OKCYAN, "Setting password", bcolors.ENDC, "at", pass_key)
consul_server.kv.put(pass_key, svc["pass"])
print()
def fix_service_user(svc):
print("Fixing service user", svc["dn"], "...")
l = get_ldap_admin_conn()
res = l.search_s(svc["dn"], ldap.SCOPE_BASE, "objectclass=*")
pass_crypt = ldap_salted_sha1.hash(svc["pass"])
if res is None or len(res) == 0:
print(bcolors.OKCYAN, "Creating entity...", bcolors.ENDC)
l.add_s(svc["dn"],
[
("objectclass", [b"person", b"top"]),
("displayname", [svc["desc"].encode('ascii')]),
("userpassword", [pass_crypt.encode('ascii')]),
])
else:
print(bcolors.OKCYAN, "Resetting entity password", bcolors.ENDC)
l.modify_s(svc["dn"],
[
(ldap.MOD_REPLACE, "userpassword", [pass_crypt.encode('ascii')])
])
# ---- MAIN ----
if __name__ == "__main__":
for i, val in enumerate(sys.argv):
if val == "check":
check_secrets(sys.argv[i+1:])
break
elif val == "gen":
gen_secrets(sys.argv[i+1:], False)
break
elif val == "regen":
gen_secrets(sys.argv[i+1:], True)
break
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