forked from TrueCloudLab/certificates
298 lines
9.5 KiB
Go
298 lines
9.5 KiB
Go
package authority
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import (
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"encoding/json"
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"fmt"
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"net"
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"os"
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"time"
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"github.com/pkg/errors"
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"github.com/smallstep/certificates/authority/provisioner"
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cas "github.com/smallstep/certificates/cas/apiv1"
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"github.com/smallstep/certificates/db"
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kms "github.com/smallstep/certificates/kms/apiv1"
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"github.com/smallstep/certificates/templates"
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)
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var (
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// DefaultTLSOptions represents the default TLS version as well as the cipher
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// suites used in the TLS certificates.
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DefaultTLSOptions = TLSOptions{
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CipherSuites: CipherSuites{
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"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
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"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
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"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
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},
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MinVersion: 1.2,
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MaxVersion: 1.2,
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Renegotiation: false,
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}
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defaultBackdate = time.Minute
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defaultDisableRenewal = false
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defaultEnableSSHCA = false
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globalProvisionerClaims = provisioner.Claims{
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MinTLSDur: &provisioner.Duration{Duration: 5 * time.Minute}, // TLS certs
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MaxTLSDur: &provisioner.Duration{Duration: 24 * time.Hour},
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DefaultTLSDur: &provisioner.Duration{Duration: 24 * time.Hour},
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DisableRenewal: &defaultDisableRenewal,
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MinUserSSHDur: &provisioner.Duration{Duration: 5 * time.Minute}, // User SSH certs
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MaxUserSSHDur: &provisioner.Duration{Duration: 24 * time.Hour},
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DefaultUserSSHDur: &provisioner.Duration{Duration: 16 * time.Hour},
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MinHostSSHDur: &provisioner.Duration{Duration: 5 * time.Minute}, // Host SSH certs
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MaxHostSSHDur: &provisioner.Duration{Duration: 30 * 24 * time.Hour},
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DefaultHostSSHDur: &provisioner.Duration{Duration: 30 * 24 * time.Hour},
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EnableSSHCA: &defaultEnableSSHCA,
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}
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)
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// Config represents the CA configuration and it's mapped to a JSON object.
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type Config struct {
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Root multiString `json:"root"`
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FederatedRoots []string `json:"federatedRoots"`
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IntermediateCert string `json:"crt"`
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IntermediateKey string `json:"key"`
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Address string `json:"address"`
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InsecureAddress string `json:"insecureAddress"`
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DNSNames []string `json:"dnsNames"`
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KMS *kms.Options `json:"kms,omitempty"`
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SSH *SSHConfig `json:"ssh,omitempty"`
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Logger json.RawMessage `json:"logger,omitempty"`
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DB *db.Config `json:"db,omitempty"`
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Monitoring json.RawMessage `json:"monitoring,omitempty"`
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AuthorityConfig *AuthConfig `json:"authority,omitempty"`
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TLS *TLSOptions `json:"tls,omitempty"`
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Password string `json:"password,omitempty"`
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Templates *templates.Templates `json:"templates,omitempty"`
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}
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// ASN1DN contains ASN1.DN attributes that are used in Subject and Issuer
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// x509 Certificate blocks.
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type ASN1DN struct {
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Country string `json:"country,omitempty" step:"country"`
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Organization string `json:"organization,omitempty" step:"organization"`
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OrganizationalUnit string `json:"organizationalUnit,omitempty" step:"organizationalUnit"`
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Locality string `json:"locality,omitempty" step:"locality"`
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Province string `json:"province,omitempty" step:"province"`
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StreetAddress string `json:"streetAddress,omitempty" step:"streetAddress"`
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CommonName string `json:"commonName,omitempty" step:"commonName"`
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}
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// AuthConfig represents the configuration options for the authority. An
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// underlaying registration authority can also be configured using the
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// cas.Options.
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type AuthConfig struct {
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*cas.Options
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Provisioners provisioner.List `json:"provisioners"`
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Template *ASN1DN `json:"template,omitempty"`
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Claims *provisioner.Claims `json:"claims,omitempty"`
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DisableIssuedAtCheck bool `json:"disableIssuedAtCheck,omitempty"`
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Backdate *provisioner.Duration `json:"backdate,omitempty"`
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}
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// init initializes the required fields in the AuthConfig if they are not
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// provided.
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func (c *AuthConfig) init() {
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if c.Provisioners == nil {
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c.Provisioners = provisioner.List{}
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}
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if c.Template == nil {
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c.Template = &ASN1DN{}
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}
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if c.Backdate == nil {
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c.Backdate = &provisioner.Duration{
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Duration: defaultBackdate,
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}
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}
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}
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// Validate validates the authority configuration.
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func (c *AuthConfig) Validate(audiences provisioner.Audiences) error {
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if c == nil {
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return errors.New("authority cannot be undefined")
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}
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// Initialize required fields.
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c.init()
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// Check that only one K8sSA is enabled
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var k8sCount int
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for _, p := range c.Provisioners {
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if p.GetType() == provisioner.TypeK8sSA {
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k8sCount++
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}
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}
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if k8sCount > 1 {
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return errors.New("cannot have more than one kubernetes service account provisioner")
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}
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if c.Backdate.Duration < 0 {
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return errors.New("authority.backdate cannot be less than 0")
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}
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return nil
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}
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// LoadConfiguration parses the given filename in JSON format and returns the
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// configuration struct.
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func LoadConfiguration(filename string) (*Config, error) {
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f, err := os.Open(filename)
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if err != nil {
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return nil, errors.Wrapf(err, "error opening %s", filename)
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}
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defer f.Close()
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var c Config
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if err := json.NewDecoder(f).Decode(&c); err != nil {
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return nil, errors.Wrapf(err, "error parsing %s", filename)
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}
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c.init()
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return &c, nil
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}
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// initializes the minimal configuration required to create an authority. This
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// is mainly used on embedded authorities.
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func (c *Config) init() {
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if c.DNSNames == nil {
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c.DNSNames = []string{"localhost", "127.0.0.1", "::1"}
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}
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if c.TLS == nil {
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c.TLS = &DefaultTLSOptions
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}
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if c.AuthorityConfig == nil {
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c.AuthorityConfig = &AuthConfig{}
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}
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c.AuthorityConfig.init()
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}
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// Save saves the configuration to the given filename.
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func (c *Config) Save(filename string) error {
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f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return errors.Wrapf(err, "error opening %s", filename)
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}
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defer f.Close()
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enc := json.NewEncoder(f)
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enc.SetIndent("", "\t")
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return errors.Wrapf(enc.Encode(c), "error writing %s", filename)
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}
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// Validate validates the configuration.
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func (c *Config) Validate() error {
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switch {
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case c.Address == "":
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return errors.New("address cannot be empty")
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case len(c.DNSNames) == 0:
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return errors.New("dnsNames cannot be empty")
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}
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// Options holds the RA/CAS configuration.
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ra := c.AuthorityConfig.Options
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// The default RA/CAS requires root, crt and key.
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if ra.Is(cas.SoftCAS) {
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switch {
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case c.Root.HasEmpties():
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return errors.New("root cannot be empty")
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case c.IntermediateCert == "":
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return errors.New("crt cannot be empty")
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case c.IntermediateKey == "":
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return errors.New("key cannot be empty")
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}
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}
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// Validate address (a port is required)
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if _, _, err := net.SplitHostPort(c.Address); err != nil {
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return errors.Errorf("invalid address %s", c.Address)
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}
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// Validate insecure address if it is configured
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if c.InsecureAddress != "" {
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if _, _, err := net.SplitHostPort(c.InsecureAddress); err != nil {
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return errors.Errorf("invalid address %s", c.InsecureAddress)
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}
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}
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if c.TLS == nil {
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c.TLS = &DefaultTLSOptions
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} else {
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if len(c.TLS.CipherSuites) == 0 {
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c.TLS.CipherSuites = DefaultTLSOptions.CipherSuites
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}
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if c.TLS.MaxVersion == 0 {
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c.TLS.MaxVersion = DefaultTLSOptions.MaxVersion
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}
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if c.TLS.MinVersion == 0 {
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c.TLS.MinVersion = c.TLS.MaxVersion
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}
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if c.TLS.MinVersion > c.TLS.MaxVersion {
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return errors.New("tls minVersion cannot exceed tls maxVersion")
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}
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c.TLS.Renegotiation = c.TLS.Renegotiation || DefaultTLSOptions.Renegotiation
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}
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// Validate KMS options, nil is ok.
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if err := c.KMS.Validate(); err != nil {
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return err
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}
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// Validate RA/CAS options, nil is ok.
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if err := ra.Validate(); err != nil {
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return err
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}
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// Validate ssh: nil is ok
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if err := c.SSH.Validate(); err != nil {
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return err
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}
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// Validate templates: nil is ok
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if err := c.Templates.Validate(); err != nil {
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return err
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}
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return c.AuthorityConfig.Validate(c.getAudiences())
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}
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// getAudiences returns the legacy and possible urls without the ports that will
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// be used as the default provisioner audiences. The CA might have proxies in
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// front so we cannot rely on the port.
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func (c *Config) getAudiences() provisioner.Audiences {
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audiences := provisioner.Audiences{
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Sign: []string{legacyAuthority},
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Revoke: []string{legacyAuthority},
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SSHSign: []string{},
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SSHRevoke: []string{},
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SSHRenew: []string{},
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}
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for _, name := range c.DNSNames {
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audiences.Sign = append(audiences.Sign,
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fmt.Sprintf("https://%s/1.0/sign", name),
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fmt.Sprintf("https://%s/sign", name),
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fmt.Sprintf("https://%s/1.0/ssh/sign", name),
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fmt.Sprintf("https://%s/ssh/sign", name))
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audiences.Revoke = append(audiences.Revoke,
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fmt.Sprintf("https://%s/1.0/revoke", name),
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fmt.Sprintf("https://%s/revoke", name))
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audiences.SSHSign = append(audiences.SSHSign,
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fmt.Sprintf("https://%s/1.0/ssh/sign", name),
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fmt.Sprintf("https://%s/ssh/sign", name),
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fmt.Sprintf("https://%s/1.0/sign", name),
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fmt.Sprintf("https://%s/sign", name))
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audiences.SSHRevoke = append(audiences.SSHRevoke,
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fmt.Sprintf("https://%s/1.0/ssh/revoke", name),
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fmt.Sprintf("https://%s/ssh/revoke", name))
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audiences.SSHRenew = append(audiences.SSHRenew,
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fmt.Sprintf("https://%s/1.0/ssh/renew", name),
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fmt.Sprintf("https://%s/ssh/renew", name))
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audiences.SSHRekey = append(audiences.SSHRekey,
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fmt.Sprintf("https://%s/1.0/ssh/rekey", name),
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fmt.Sprintf("https://%s/ssh/rekey", name))
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}
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return audiences
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}
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