certificates/authority/config.go

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package authority
import (
"encoding/json"
"fmt"
"net"
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"os"
"time"
"github.com/pkg/errors"
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"github.com/smallstep/certificates/authority/provisioner"
"github.com/smallstep/certificates/db"
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"github.com/smallstep/cli/crypto/tlsutil"
"github.com/smallstep/cli/crypto/x509util"
)
var (
// DefaultTLSOptions represents the default TLS version as well as the cipher
// suites used in the TLS certificates.
DefaultTLSOptions = tlsutil.TLSOptions{
CipherSuites: x509util.CipherSuites{
"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
},
MinVersion: 1.2,
MaxVersion: 1.2,
Renegotiation: false,
}
defaultDisableRenewal = false
defaultEnableSSHCA = false
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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: 4 * 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,
}
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)
// Config represents the CA configuration and it's mapped to a JSON object.
type Config struct {
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Root multiString `json:"root"`
FederatedRoots []string `json:"federatedRoots"`
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IntermediateCert string `json:"crt"`
IntermediateKey string `json:"key"`
Address string `json:"address"`
DNSNames []string `json:"dnsNames"`
SSH *SSHConfig `json:"ssh,omitempty"`
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Logger json.RawMessage `json:"logger,omitempty"`
DB *db.Config `json:"db,omitempty"`
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Monitoring json.RawMessage `json:"monitoring,omitempty"`
AuthorityConfig *AuthConfig `json:"authority,omitempty"`
TLS *tlsutil.TLSOptions `json:"tls,omitempty"`
Password string `json:"password,omitempty"`
}
// AuthConfig represents the configuration options for the authority.
type AuthConfig struct {
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Provisioners provisioner.List `json:"provisioners"`
Template *x509util.ASN1DN `json:"template,omitempty"`
Claims *provisioner.Claims `json:"claims,omitempty"`
DisableIssuedAtCheck bool `json:"disableIssuedAtCheck,omitempty"`
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}
// Validate validates the authority configuration.
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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}
if len(c.Provisioners) == 0 {
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return errors.New("authority.provisioners cannot be empty")
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}
// Merge global and configuration claims
claimer, err := provisioner.NewClaimer(c.Claims, globalProvisionerClaims)
if err != nil {
return err
}
// Initialize provisioners
config := provisioner.Config{
Claims: claimer.Claims(),
Audiences: audiences,
}
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for _, p := range c.Provisioners {
if err := p.Init(config); err != nil {
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return err
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}
}
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if c.Template == nil {
c.Template = &x509util.ASN1DN{}
}
return nil
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}
// SSHConfig contains the user and host keys.
type SSHConfig struct {
HostKey string `json:"hostKey"`
UserKey string `json:"userKey"`
AddUserPrincipal string `json:"addUserPrincipal"`
AddUserCommand string `json:"addUserCommand"`
}
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// 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)
}
return &c, nil
}
// 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")
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case c.Root.HasEmpties():
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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")
case len(c.DNSNames) == 0:
return errors.New("dnsNames 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)
}
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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 = c.TLS.MaxVersion
}
if c.TLS.MinVersion > c.TLS.MaxVersion {
return errors.New("tls minVersion cannot exceed tls maxVersion")
}
c.TLS.Renegotiation = c.TLS.Renegotiation || DefaultTLSOptions.Renegotiation
}
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},
}
for _, name := range c.DNSNames {
audiences.Sign = append(audiences.Sign,
fmt.Sprintf("https://%s/sign", name), fmt.Sprintf("https://%s/1.0/sign", name))
audiences.Revoke = append(audiences.Revoke,
fmt.Sprintf("https://%s/revoke", name), fmt.Sprintf("https://%s/1.0/revoke", name))
}
return audiences
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}