package db import ( "crypto/x509" "encoding/json" "strconv" "strings" "time" "github.com/pkg/errors" "github.com/smallstep/nosql" "github.com/smallstep/nosql/database" "golang.org/x/crypto/ssh" ) var ( certsTable = []byte("x509_certs") revokedCertsTable = []byte("revoked_x509_certs") revokedSSHCertsTable = []byte("revoked_ssh_certs") usedOTTTable = []byte("used_ott") sshCertsTable = []byte("ssh_certs") sshHostsTable = []byte("ssh_hosts") sshUsersTable = []byte("ssh_users") sshHostPrincipalsTable = []byte("ssh_host_principals") ) // ErrAlreadyExists can be returned if the DB attempts to set a key that has // been previously set. var ErrAlreadyExists = errors.New("already exists") // Config represents the JSON attributes used for configuring a step-ca DB. type Config struct { Type string `json:"type"` DataSource string `json:"dataSource"` ValueDir string `json:"valueDir,omitempty"` Database string `json:"database,omitempty"` } // AuthDB is an interface over an Authority DB client that implements a nosql.DB interface. type AuthDB interface { IsRevoked(sn string) (bool, error) IsSSHRevoked(sn string) (bool, error) Revoke(rci *RevokedCertificateInfo) error RevokeSSH(rci *RevokedCertificateInfo) error StoreCertificate(crt *x509.Certificate) error UseToken(id, tok string) (bool, error) IsSSHHost(name string) (bool, error) StoreSSHCertificate(crt *ssh.Certificate) error GetSSHHostPrincipals() ([]string, error) Shutdown() error } // DB is a wrapper over the nosql.DB interface. type DB struct { nosql.DB isUp bool } // New returns a new database client that implements the AuthDB interface. func New(c *Config) (AuthDB, error) { if c == nil { return newSimpleDB(c) } db, err := nosql.New(c.Type, c.DataSource, nosql.WithDatabase(c.Database), nosql.WithValueDir(c.ValueDir)) if err != nil { return nil, errors.Wrapf(err, "Error opening database of Type %s with source %s", c.Type, c.DataSource) } tables := [][]byte{ revokedCertsTable, certsTable, usedOTTTable, sshCertsTable, sshHostsTable, sshHostPrincipalsTable, sshUsersTable, revokedSSHCertsTable, } for _, b := range tables { if err := db.CreateTable(b); err != nil { return nil, errors.Wrapf(err, "error creating table %s", string(b)) } } return &DB{db, true}, nil } // RevokedCertificateInfo contains information regarding the certificate // revocation action. type RevokedCertificateInfo struct { Serial string ProvisionerID string ReasonCode int Reason string RevokedAt time.Time TokenID string MTLS bool } // IsRevoked returns whether or not a certificate with the given identifier // has been revoked. // In the case of an X509 Certificate the `id` should be the Serial Number of // the Certificate. func (db *DB) IsRevoked(sn string) (bool, error) { // If the DB is nil then act as pass through. if db == nil { return false, nil } // If the error is `Not Found` then the certificate has not been revoked. // Any other error should be propagated to the caller. if _, err := db.Get(revokedCertsTable, []byte(sn)); err != nil { if nosql.IsErrNotFound(err) { return false, nil } return false, errors.Wrap(err, "error checking revocation bucket") } // This certificate has been revoked. return true, nil } // IsSSHRevoked returns whether or not a certificate with the given identifier // has been revoked. // In the case of an X509 Certificate the `id` should be the Serial Number of // the Certificate. func (db *DB) IsSSHRevoked(sn string) (bool, error) { // If the DB is nil then act as pass through. if db == nil { return false, nil } // If the error is `Not Found` then the certificate has not been revoked. // Any other error should be propagated to the caller. if _, err := db.Get(revokedSSHCertsTable, []byte(sn)); err != nil { if nosql.IsErrNotFound(err) { return false, nil } return false, errors.Wrap(err, "error checking revocation bucket") } // This certificate has been revoked. return true, nil } // Revoke adds a certificate to the revocation table. func (db *DB) Revoke(rci *RevokedCertificateInfo) error { rcib, err := json.Marshal(rci) if err != nil { return errors.Wrap(err, "error marshaling revoked certificate info") } _, swapped, err := db.CmpAndSwap(revokedCertsTable, []byte(rci.Serial), nil, rcib) switch { case err != nil: return errors.Wrap(err, "error AuthDB CmpAndSwap") case !swapped: return ErrAlreadyExists default: return nil } } // RevokeSSH adds a SSH certificate to the revocation table. func (db *DB) RevokeSSH(rci *RevokedCertificateInfo) error { rcib, err := json.Marshal(rci) if err != nil { return errors.Wrap(err, "error marshaling revoked certificate info") } _, swapped, err := db.CmpAndSwap(revokedSSHCertsTable, []byte(rci.Serial), nil, rcib) switch { case err != nil: return errors.Wrap(err, "error AuthDB CmpAndSwap") case !swapped: return ErrAlreadyExists default: return nil } } // StoreCertificate stores a certificate PEM. func (db *DB) StoreCertificate(crt *x509.Certificate) error { if err := db.Set(certsTable, []byte(crt.SerialNumber.String()), crt.Raw); err != nil { return errors.Wrap(err, "database Set error") } return nil } // UseToken returns true if we were able to successfully store the token for // for the first time, false otherwise. func (db *DB) UseToken(id, tok string) (bool, error) { _, swapped, err := db.CmpAndSwap(usedOTTTable, []byte(id), nil, []byte(tok)) if err != nil { return false, errors.Wrapf(err, "error storing used token %s/%s", string(usedOTTTable), id) } return swapped, nil } // IsSSHHost returns if a principal is present in the ssh hosts table. func (db *DB) IsSSHHost(principal string) (bool, error) { if _, err := db.Get(sshHostsTable, []byte(strings.ToLower(principal))); err != nil { if database.IsErrNotFound(err) { return false, nil } return false, errors.Wrap(err, "database Get error") } return true, nil } type sshHostPrincipalData struct { Serial string Expiry uint64 } // StoreSSHCertificate stores an SSH certificate. func (db *DB) StoreSSHCertificate(crt *ssh.Certificate) error { serial := strconv.FormatUint(crt.Serial, 10) tx := new(database.Tx) tx.Set(sshCertsTable, []byte(serial), crt.Marshal()) if crt.CertType == ssh.HostCert { for _, p := range crt.ValidPrincipals { hostPrincipalData, err := json.Marshal(sshHostPrincipalData{ Serial: serial, Expiry: crt.ValidBefore, }) if err != nil { return err } tx.Set(sshHostsTable, []byte(strings.ToLower(p)), []byte(serial)) tx.Set(sshHostPrincipalsTable, []byte(strings.ToLower(p)), hostPrincipalData) } } else { for _, p := range crt.ValidPrincipals { tx.Set(sshUsersTable, []byte(strings.ToLower(p)), []byte(serial)) } } if err := db.Update(tx); err != nil { return errors.Wrap(err, "database Update error") } return nil } // GetSSHHostPrincipals gets a list of all valid host principals. func (db *DB) GetSSHHostPrincipals() ([]string, error) { entries, err := db.List(sshHostPrincipalsTable) if err != nil { return nil, err } var principals []string for _, e := range entries { var data sshHostPrincipalData if err := json.Unmarshal(e.Value, &data); err != nil { return nil, err } if time.Unix(int64(data.Expiry), 0).After(time.Now()) { principals = append(principals, string(e.Key)) } } return principals, nil } // Shutdown sends a shutdown message to the database. func (db *DB) Shutdown() error { if db.isUp { if err := db.Close(); err != nil { return errors.Wrap(err, "database shutdown error") } db.isUp = false } return nil } // MockNoSQLDB // type MockNoSQLDB struct { Err error Ret1, Ret2 interface{} MGet func(bucket, key []byte) ([]byte, error) MSet func(bucket, key, value []byte) error MOpen func(dataSourceName string, opt ...database.Option) error MClose func() error MCreateTable func(bucket []byte) error MDeleteTable func(bucket []byte) error MDel func(bucket, key []byte) error MList func(bucket []byte) ([]*database.Entry, error) MUpdate func(tx *database.Tx) error MCmpAndSwap func(bucket, key, old, newval []byte) ([]byte, bool, error) } // CmpAndSwap mock func (m *MockNoSQLDB) CmpAndSwap(bucket, key, old, newval []byte) ([]byte, bool, error) { if m.MCmpAndSwap != nil { return m.MCmpAndSwap(bucket, key, old, newval) } if m.Ret1 == nil { return nil, false, m.Err } return m.Ret1.([]byte), m.Ret2.(bool), m.Err } // Get mock func (m *MockNoSQLDB) Get(bucket, key []byte) ([]byte, error) { if m.MGet != nil { return m.MGet(bucket, key) } if m.Ret1 == nil { return nil, m.Err } return m.Ret1.([]byte), m.Err } // Set mock func (m *MockNoSQLDB) Set(bucket, key, value []byte) error { if m.MSet != nil { return m.MSet(bucket, key, value) } return m.Err } // Open mock func (m *MockNoSQLDB) Open(dataSourceName string, opt ...database.Option) error { if m.MOpen != nil { return m.MOpen(dataSourceName, opt...) } return m.Err } // Close mock func (m *MockNoSQLDB) Close() error { if m.MClose != nil { return m.MClose() } return m.Err } // CreateTable mock func (m *MockNoSQLDB) CreateTable(bucket []byte) error { if m.MCreateTable != nil { return m.MCreateTable(bucket) } return m.Err } // DeleteTable mock func (m *MockNoSQLDB) DeleteTable(bucket []byte) error { if m.MDeleteTable != nil { return m.MDeleteTable(bucket) } return m.Err } // Del mock func (m *MockNoSQLDB) Del(bucket, key []byte) error { if m.MDel != nil { return m.MDel(bucket, key) } return m.Err } // List mock func (m *MockNoSQLDB) List(bucket []byte) ([]*database.Entry, error) { if m.MList != nil { return m.MList(bucket) } return m.Ret1.([]*database.Entry), m.Err } // Update mock func (m *MockNoSQLDB) Update(tx *database.Tx) error { if m.MUpdate != nil { return m.MUpdate(tx) } return m.Err }