void SASLServerMechanismRegistry::advertiseMechanismNamesForUser(OperationContext* opCtx,
const BSONObj& isMasterCmd,
BSONObjBuilder* builder) {
BSONElement saslSupportedMechs = isMasterCmd["saslSupportedMechs"];
if (saslSupportedMechs.type() == BSONType::String) {
UserName userName = uassertStatusOK(UserName::parse(saslSupportedMechs.String()));
// Authenticating the __system@local user to the admin database on mongos is required
// by the auth passthrough test suite.
if (getTestCommandsEnabled() &&
userName.getUser() == internalSecurity.user->getName().getUser() &&
userName.getDB() == "admin") {
userName = internalSecurity.user->getName();
}
AuthorizationManager* authManager = AuthorizationManager::get(opCtx->getServiceContext());
UserHandle user;
const auto swUser = authManager->acquireUser(opCtx, userName);
if (!swUser.isOK()) {
auto& status = swUser.getStatus();
if (status.code() == ErrorCodes::UserNotFound) {
log() << "Supported SASL mechanisms requested for unknown user '" << userName
<< "'";
return;
}
uassertStatusOK(status);
}
user = std::move(swUser.getValue());
BSONArrayBuilder mechanismsBuilder;
const auto& mechList = _getMapRef(userName.getDB());
for (const auto& factoryIt : mechList) {
SecurityPropertySet properties = factoryIt->properties();
if (!properties.hasAllProperties(SecurityPropertySet{SecurityProperty::kNoPlainText,
SecurityProperty::kMutualAuth}) &&
userName.getDB() != "$external") {
continue;
}
auto mechanismEnabled = _mechanismSupportedByConfig(factoryIt->mechanismName());
if (!mechanismEnabled && userName == internalSecurity.user->getName()) {
mechanismEnabled = factoryIt->isInternalAuthMech();
}
if (mechanismEnabled && factoryIt->canMakeMechanismForUser(user.get())) {
mechanismsBuilder << factoryIt->mechanismName();
}
}
builder->appendArray("saslSupportedMechs", mechanismsBuilder.arr());
}
}
StatusWith<std::tuple<bool, std::string>> SASLPlainServerMechanism::stepImpl(
OperationContext* opCtx, StringData inputData) {
if (_authenticationDatabase == "$external") {
return Status(ErrorCodes::AuthenticationFailed,
"PLAIN mechanism must be used with internal users");
}
AuthorizationManager* authManager = AuthorizationManager::get(opCtx->getServiceContext());
// Expecting user input on the form: [authz-id]\0authn-id\0pwd
std::string input = inputData.toString();
SecureAllocatorAuthDomain::SecureString pwd = "";
try {
size_t firstNull = inputData.find('\0');
if (firstNull == std::string::npos) {
return Status(
ErrorCodes::AuthenticationFailed,
str::stream()
<< "Incorrectly formatted PLAIN client message, missing first NULL delimiter");
}
size_t secondNull = inputData.find('\0', firstNull + 1);
if (secondNull == std::string::npos) {
return Status(
ErrorCodes::AuthenticationFailed,
str::stream()
<< "Incorrectly formatted PLAIN client message, missing second NULL delimiter");
}
std::string authorizationIdentity = input.substr(0, firstNull);
ServerMechanismBase::_principalName =
input.substr(firstNull + 1, (secondNull - firstNull) - 1);
if (ServerMechanismBase::_principalName.empty()) {
return Status(ErrorCodes::AuthenticationFailed,
str::stream()
<< "Incorrectly formatted PLAIN client message, empty username");
} else if (!authorizationIdentity.empty() &&
authorizationIdentity != ServerMechanismBase::_principalName) {
return Status(ErrorCodes::AuthenticationFailed,
str::stream()
<< "SASL authorization identity must match authentication identity");
}
pwd = SecureAllocatorAuthDomain::SecureString(input.substr(secondNull + 1).c_str());
if (pwd->empty()) {
return Status(ErrorCodes::AuthenticationFailed,
str::stream()
<< "Incorrectly formatted PLAIN client message, empty password");
}
} catch (std::out_of_range&) {
return Status(ErrorCodes::AuthenticationFailed,
str::stream() << "Incorrectly formatted PLAIN client message");
}
// The authentication database is also the source database for the user.
auto swUser = authManager->acquireUser(
opCtx, UserName(ServerMechanismBase::_principalName, _authenticationDatabase));
if (!swUser.isOK()) {
return swUser.getStatus();
}
auto userObj = std::move(swUser.getValue());
const auto creds = userObj->getCredentials();
const auto sha256Status = trySCRAM<SHA256Block>(creds, pwd->c_str());
if (!sha256Status.isOK()) {
return sha256Status.getStatus();
}
if (sha256Status.getValue()) {
return std::make_tuple(true, std::string());
}
const auto authDigest = createPasswordDigest(ServerMechanismBase::_principalName, pwd->c_str());
const auto sha1Status = trySCRAM<SHA1Block>(creds, authDigest);
if (!sha1Status.isOK()) {
return sha1Status.getStatus();
}
if (sha1Status.getValue()) {
return std::make_tuple(true, std::string());
}
return Status(ErrorCodes::AuthenticationFailed, str::stream() << "No credentials available.");
return std::make_tuple(true, std::string());
}