package config import ( "encoding/json" "fmt" "net" "os" "time" "github.com/pkg/errors" "github.com/smallstep/certificates/authority/provisioner" cas "github.com/smallstep/certificates/cas/apiv1" "github.com/smallstep/certificates/db" kms "github.com/smallstep/certificates/kms/apiv1" "github.com/smallstep/certificates/templates" "go.step.sm/linkedca" ) const ( legacyAuthority = "step-certificate-authority" ) var ( // DefaultBackdate length of time to backdate certificates to avoid // clock skew validation issues. DefaultBackdate = time.Minute // DefaultDisableRenewal disables renewals per provisioner. DefaultDisableRenewal = false // DefaultEnableSSHCA enable SSH CA features per provisioner or globally // for all provisioners. DefaultEnableSSHCA = false // GlobalProvisionerClaims default claims for the Authority. Can be overridden // by provisioner specific claims. GlobalProvisionerClaims = provisioner.Claims{ MinTLSDur: &provisioner.Duration{Duration: 5 * time.Minute}, // TLS certs MaxTLSDur: &provisioner.Duration{Duration: 24 * time.Hour}, DefaultTLSDur: &provisioner.Duration{Duration: 24 * time.Hour}, DisableRenewal: &DefaultDisableRenewal, MinUserSSHDur: &provisioner.Duration{Duration: 5 * time.Minute}, // User SSH certs MaxUserSSHDur: &provisioner.Duration{Duration: 24 * time.Hour}, DefaultUserSSHDur: &provisioner.Duration{Duration: 16 * time.Hour}, MinHostSSHDur: &provisioner.Duration{Duration: 5 * time.Minute}, // Host SSH certs MaxHostSSHDur: &provisioner.Duration{Duration: 30 * 24 * time.Hour}, DefaultHostSSHDur: &provisioner.Duration{Duration: 30 * 24 * time.Hour}, EnableSSHCA: &DefaultEnableSSHCA, } ) // Config represents the CA configuration and it's mapped to a JSON object. type Config struct { Root multiString `json:"root"` FederatedRoots []string `json:"federatedRoots"` IntermediateCert string `json:"crt"` IntermediateKey string `json:"key"` Address string `json:"address"` InsecureAddress string `json:"insecureAddress"` DNSNames []string `json:"dnsNames"` KMS *kms.Options `json:"kms,omitempty"` SSH *SSHConfig `json:"ssh,omitempty"` Logger json.RawMessage `json:"logger,omitempty"` DB *db.Config `json:"db,omitempty"` Monitoring json.RawMessage `json:"monitoring,omitempty"` AuthorityConfig *AuthConfig `json:"authority,omitempty"` TLS *TLSOptions `json:"tls,omitempty"` Password string `json:"password,omitempty"` Templates *templates.Templates `json:"templates,omitempty"` } // ASN1DN contains ASN1.DN attributes that are used in Subject and Issuer // x509 Certificate blocks. type ASN1DN struct { Country string `json:"country,omitempty"` Organization string `json:"organization,omitempty"` OrganizationalUnit string `json:"organizationalUnit,omitempty"` Locality string `json:"locality,omitempty"` Province string `json:"province,omitempty"` StreetAddress string `json:"streetAddress,omitempty"` SerialNumber string `json:"serialNumber,omitempty"` CommonName string `json:"commonName,omitempty"` } // AuthConfig represents the configuration options for the authority. An // underlaying registration authority can also be configured using the // cas.Options. type AuthConfig struct { *cas.Options AuthorityID string `json:"authorityId,omitempty"` DeploymentType string `json:"deploymentType,omitempty"` Provisioners provisioner.List `json:"provisioners,omitempty"` Admins []*linkedca.Admin `json:"-"` Template *ASN1DN `json:"template,omitempty"` Claims *provisioner.Claims `json:"claims,omitempty"` DisableIssuedAtCheck bool `json:"disableIssuedAtCheck,omitempty"` Backdate *provisioner.Duration `json:"backdate,omitempty"` EnableAdmin bool `json:"enableAdmin,omitempty"` } // init initializes the required fields in the AuthConfig if they are not // provided. func (c *AuthConfig) init() { if c.Provisioners == nil { c.Provisioners = provisioner.List{} } if c.Template == nil { c.Template = &ASN1DN{} } if c.Backdate == nil { c.Backdate = &provisioner.Duration{ Duration: DefaultBackdate, } } } // Validate validates the authority configuration. func (c *AuthConfig) Validate(audiences provisioner.Audiences) error { if c == nil { return errors.New("authority cannot be undefined") } // Initialize required fields. c.init() // Check that only one K8sSA is enabled var k8sCount int for _, p := range c.Provisioners { if p.GetType() == provisioner.TypeK8sSA { k8sCount++ } } if k8sCount > 1 { return errors.New("cannot have more than one kubernetes service account provisioner") } if c.Backdate.Duration < 0 { return errors.New("authority.backdate cannot be less than 0") } return nil } // LoadConfiguration parses the given filename in JSON format and returns the // configuration struct. func LoadConfiguration(filename string) (*Config, error) { f, err := os.Open(filename) if err != nil { return nil, errors.Wrapf(err, "error opening %s", filename) } defer f.Close() var c Config if err := json.NewDecoder(f).Decode(&c); err != nil { return nil, errors.Wrapf(err, "error parsing %s", filename) } c.Init() return &c, nil } // Init initializes the minimal configuration required to create an authority. This // is mainly used on embedded authorities. func (c *Config) Init() { if c.DNSNames == nil { c.DNSNames = []string{"localhost", "127.0.0.1", "::1"} } if c.TLS == nil { c.TLS = &DefaultTLSOptions } if c.AuthorityConfig == nil { c.AuthorityConfig = &AuthConfig{} } c.AuthorityConfig.init() } // Save saves the configuration to the given filename. func (c *Config) Save(filename string) error { f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600) if err != nil { return errors.Wrapf(err, "error opening %s", filename) } defer f.Close() enc := json.NewEncoder(f) enc.SetIndent("", "\t") return errors.Wrapf(enc.Encode(c), "error writing %s", filename) } // Validate validates the configuration. func (c *Config) Validate() error { switch { case c.Address == "": return errors.New("address cannot be empty") case len(c.DNSNames) == 0: return errors.New("dnsNames cannot be empty") case c.AuthorityConfig == nil: return errors.New("authority cannot be nil") } // Options holds the RA/CAS configuration. ra := c.AuthorityConfig.Options // The default RA/CAS requires root, crt and key. if ra.Is(cas.SoftCAS) { switch { case c.Root.HasEmpties(): return errors.New("root cannot be empty") case c.IntermediateCert == "": return errors.New("crt cannot be empty") case c.IntermediateKey == "": return errors.New("key cannot be empty") } } // Validate address (a port is required) if _, _, err := net.SplitHostPort(c.Address); err != nil { return errors.Errorf("invalid address %s", c.Address) } if c.TLS == nil { c.TLS = &DefaultTLSOptions } else { if len(c.TLS.CipherSuites) == 0 { c.TLS.CipherSuites = DefaultTLSOptions.CipherSuites } if c.TLS.MaxVersion == 0 { c.TLS.MaxVersion = DefaultTLSOptions.MaxVersion } if c.TLS.MinVersion == 0 { c.TLS.MinVersion = DefaultTLSOptions.MinVersion } if c.TLS.MinVersion > c.TLS.MaxVersion { return errors.New("tls minVersion cannot exceed tls maxVersion") } c.TLS.Renegotiation = c.TLS.Renegotiation || DefaultTLSOptions.Renegotiation } // Validate KMS options, nil is ok. if err := c.KMS.Validate(); err != nil { return err } // Validate RA/CAS options, nil is ok. if err := ra.Validate(); err != nil { return err } // Validate ssh: nil is ok if err := c.SSH.Validate(); err != nil { return err } // Validate templates: nil is ok if err := c.Templates.Validate(); err != nil { return err } return c.AuthorityConfig.Validate(c.GetAudiences()) } // GetAudiences returns the legacy and possible urls without the ports that will // be used as the default provisioner audiences. The CA might have proxies in // front so we cannot rely on the port. func (c *Config) GetAudiences() provisioner.Audiences { audiences := provisioner.Audiences{ Sign: []string{legacyAuthority}, Revoke: []string{legacyAuthority}, SSHSign: []string{}, SSHRevoke: []string{}, SSHRenew: []string{}, } for _, name := range c.DNSNames { audiences.Sign = append(audiences.Sign, fmt.Sprintf("https://%s/1.0/sign", toHostname(name)), fmt.Sprintf("https://%s/sign", toHostname(name)), fmt.Sprintf("https://%s/1.0/ssh/sign", toHostname(name)), fmt.Sprintf("https://%s/ssh/sign", toHostname(name))) audiences.Revoke = append(audiences.Revoke, fmt.Sprintf("https://%s/1.0/revoke", toHostname(name)), fmt.Sprintf("https://%s/revoke", toHostname(name))) audiences.SSHSign = append(audiences.SSHSign, fmt.Sprintf("https://%s/1.0/ssh/sign", toHostname(name)), fmt.Sprintf("https://%s/ssh/sign", toHostname(name)), fmt.Sprintf("https://%s/1.0/sign", toHostname(name)), fmt.Sprintf("https://%s/sign", toHostname(name))) audiences.SSHRevoke = append(audiences.SSHRevoke, fmt.Sprintf("https://%s/1.0/ssh/revoke", toHostname(name)), fmt.Sprintf("https://%s/ssh/revoke", toHostname(name))) audiences.SSHRenew = append(audiences.SSHRenew, fmt.Sprintf("https://%s/1.0/ssh/renew", toHostname(name)), fmt.Sprintf("https://%s/ssh/renew", toHostname(name))) audiences.SSHRekey = append(audiences.SSHRekey, fmt.Sprintf("https://%s/1.0/ssh/rekey", toHostname(name)), fmt.Sprintf("https://%s/ssh/rekey", toHostname(name))) } return audiences } func toHostname(name string) string { // ensure an IPv6 address is represented with square brackets when used as hostname if ip := net.ParseIP(name); ip != nil && ip.To4() == nil { name = "[" + name + "]" } return name }