def delete_account(self, user):
"""
Delete the 'user'.
Clear utmp first, to avoid error.
Removes the /etc/sudoers.d/waagent file.
"""
userentry = None
try:
userentry = pwd.getpwnam(user)
except (EnvironmentError, KeyError):
pass
if userentry is None:
logger.error("DeleteAccount: " + user + " not found.")
return
uidmin = None
try:
if os.path.isfile("/etc/login.defs"):
uidmin = int(
ext_utils.get_line_starting_with("UID_MIN", "/etc/login.defs").split()[1])
except (ValueError, KeyError, AttributeError, EnvironmentError):
pass
if uidmin is None:
uidmin = 100
if userentry[2] < uidmin:
logger.error(
"DeleteAccount: " + user + " is a system user. Will not delete account.")
return
# empty contents of utmp to prevent error if we are the 'user' deleted
ext_utils.run_command_and_write_stdout_to_file(['echo'], '/var/run/utmp')
ext_utils.run(['rmuser', '-y', user], chk_err=False)
try:
os.remove(self.sudoers_dir_base + "/sudoers.d/waagent")
except EnvironmentError:
pass
return
def test_code_injection2(self):
self.setup()
self.addCleanup(self.cleanup)
# failure cases
out_file = self.get_random_filename()
exit_code = ext_utils.run_command_and_write_stdout_to_file(
"echo hello; echo world", out_file)
self.assertNotEqual(0, exit_code, "exit code != 0")
out_file = self.get_random_filename()
exit_code = ext_utils.run_command_and_write_stdout_to_file(
["echo hello; echo world"], out_file)
self.assertNotEqual(0, exit_code, "exit code != 0")
# success case
out_file = self.get_random_filename()
exit_code = ext_utils.run_command_and_write_stdout_to_file(
["echo", "hello", ";", "echo", "world"], out_file)
self.assertEqual(0, exit_code, "exit code == 0")
file_contents = ext_utils.get_file_contents(out_file)
self.assertEqual("hello ; echo world\n", file_contents,
"unexpected output")
out_file = self.get_random_filename()
exit_code = ext_utils.run_command_and_write_stdout_to_file(
["echo", "hello", "world"], out_file)
self.assertEqual(0, exit_code, "exit code == 0")
file_contents = ext_utils.get_file_contents(out_file)
self.assertEqual("hello world\n", file_contents, "unexpected output")
def create_account(self, user, password, expiration, thumbprint):
"""
Create a user account, with 'user', 'password', 'expiration', ssh keys
and sudo permissions.
Returns None if successful, error string on failure.
"""
userentry = None
try:
userentry = pwd.getpwnam(user)
except (EnvironmentError, KeyError):
pass
uidmin = None
try:
uidmin = int(ext_utils.get_line_starting_with("UID_MIN", "/etc/login.defs").split()[1])
except (ValueError, KeyError, AttributeError, EnvironmentError):
pass
if uidmin is None:
uidmin = 100
if userentry is not None and userentry[2] < uidmin and userentry[2] != self.CORE_UID:
logger.error(
"CreateAccount: " + user + " is a system user. Will not set password.")
return "Failed to set password for system user: "******" (0x06)."
if userentry is None:
command = ['useradd', '--create-home', '--password', '*', user]
if expiration is not None:
command += ['--expiredate', expiration.split('.')[0]]
if ext_utils.run(command):
logger.error("Failed to create user account: " + user)
return "Failed to create user account: " + user + " (0x07)."
else:
logger.log("CreateAccount: " + user + " already exists. Will update password.")
if password is not None:
self.change_password(user, password)
try:
if password is None:
ext_utils.set_file_contents("/etc/sudoers.d/waagent", user + " ALL = (ALL) NOPASSWD: ALL\n")
else:
ext_utils.set_file_contents("/etc/sudoers.d/waagent", user + " ALL = (ALL) ALL\n")
os.chmod("/etc/sudoers.d/waagent", 0o440)
except EnvironmentError:
logger.error("CreateAccount: Failed to configure sudo access for user.")
return "Failed to configure sudo privileges (0x08)."
home = self.get_home()
if thumbprint is not None:
ssh_dir = home + "/" + user + "/.ssh"
ext_utils.create_dir(ssh_dir, user, 0o700)
pub = ssh_dir + "/id_rsa.pub"
prv = ssh_dir + "/id_rsa"
ext_utils.run_command_and_write_stdout_to_file(['ssh-keygen', '-y', '-f', thumbprint + '.prv'], pub)
ext_utils.set_file_contents(prv, ext_utils.get_file_contents(thumbprint + ".prv"))
for f in [pub, prv]:
os.chmod(f, 0o600)
ext_utils.change_owner(f, user)
ext_utils.set_file_contents(ssh_dir + "/authorized_keys", ext_utils.get_file_contents(pub))
ext_utils.change_owner(ssh_dir + "/authorized_keys", user)
logger.log("Created user account: " + user)
return None
def ssh_deploy_public_key(self, fprint, path):
"""
Generic sshDeployPublicKey - over-ridden in some concrete Distro classes due to minor differences
in openssl packages deployed
"""
keygen_retcode = ext_utils.run_command_and_write_stdout_to_file(
['ssh-keygen', '-i', '-m', 'PKCS8', '-f', fprint], path)
if keygen_retcode:
return 1
else:
return 0
def _set_user_account_pub_key(protect_settings, hutil):
ovf_xml = None
ovf_env = None
try:
ovf_xml = ext_utils.get_file_contents('/var/lib/waagent/ovf-env.xml')
ovf_env = ovf_utils.OvfEnv.parse(ovf_xml, Configuration)
except (EnvironmentError, ValueError, KeyError, AttributeError):
pass
if ovf_xml is None or ovf_env is None:
# default ovf_env with empty data
ovf_env = ovf_utils.OvfEnv()
logger.log("could not load ovf-env.xml")
# user name must be provided if set ssh key or password
if not protect_settings or 'username' not in protect_settings:
return
user_name = protect_settings['username']
user_pass = protect_settings.get('password')
cert_txt = protect_settings.get('ssh_key')
expiration = protect_settings.get('expiration')
no_convert = False
if not user_pass and not cert_txt and not ovf_env.SshPublicKeys:
raise Exception("No password or ssh_key is specified.")
if user_pass is not None and len(user_pass) == 0:
user_pass = None
hutil.log("empty passwords are not allowed, ignoring password reset")
# Reset user account and password, password could be empty
sudoers = _get_other_sudoers(user_name)
error_string = MyDistro.create_account(user_name, user_pass, expiration,
None)
_save_other_sudoers(sudoers)
if error_string is not None:
err_msg = "Failed to create the account or set the password"
ext_utils.add_extension_event(name=hutil.get_name(),
op=constants.WALAEventOperation.Enable,
is_success=False,
message="(02101)" + err_msg)
raise Exception(err_msg + " with " + error_string)
hutil.log("Succeeded in creating the account or setting the password.")
# Allow password authentication if user_pass is provided
if user_pass is not None:
ext_utils.add_extension_event(name=hutil.get_name(),
op="scenario",
is_success=True,
message="create-user-with-password")
_allow_password_auth()
# Reset ssh key with the new public key passed in or reuse old public key.
if cert_txt:
if cert_txt and cert_txt.strip().lower().startswith("ssh-rsa"):
no_convert = True
try:
pub_path = os.path.join('/home/', user_name, '.ssh',
'authorized_keys')
ovf_env.UserName = user_name
if no_convert:
if cert_txt:
pub_path = ovf_env.prepare_dir(pub_path, MyDistro)
final_cert_txt = cert_txt
if not cert_txt.endswith("\n"):
final_cert_txt = final_cert_txt + "\n"
ext_utils.append_file_contents(pub_path, final_cert_txt)
MyDistro.set_se_linux_context(
pub_path, 'unconfined_u:object_r:ssh_home_t:s0')
ext_utils.change_owner(pub_path, user_name)
ext_utils.add_extension_event(name=hutil.get_name(),
op="scenario",
is_success=True,
message="create-user")
hutil.log("Succeeded in resetting ssh_key.")
else:
err_msg = "Failed to reset ssh key because the cert content is empty."
ext_utils.add_extension_event(
name=hutil.get_name(),
op=constants.WALAEventOperation.Enable,
is_success=False,
message="(02100)" + err_msg)
else:
# do the certificate conversion
# we support PKCS8 certificates besides ssh-rsa public keys
_save_cert_str_as_file(cert_txt, 'temp.crt')
pub_path = ovf_env.prepare_dir(pub_path, MyDistro)
retcode = ext_utils.run_command_and_write_stdout_to_file([
constants.Openssl, 'x509', '-in', 'temp.crt', '-noout',
'-pubkey'
], "temp.pub")
if retcode > 0:
raise Exception("Failed to generate public key file.")
MyDistro.ssh_deploy_public_key('temp.pub', pub_path)
os.remove('temp.pub')
os.remove('temp.crt')
ext_utils.add_extension_event(name=hutil.get_name(),
op="scenario",
is_success=True,
message="create-user")
hutil.log("Succeeded in resetting ssh_key.")
except Exception as e:
hutil.log(str(e))
ext_utils.add_extension_event(
name=hutil.get_name(),
op=constants.WALAEventOperation.Enable,
is_success=False,
message="(02100)Failed to reset ssh key.")
raise e