mirror of https://github.com/k3s-io/k3s
660 lines
20 KiB
Go
660 lines
20 KiB
Go
// Package config contains the configuration logic for CFSSL.
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package config
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import (
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"crypto/tls"
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"crypto/x509"
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"encoding/asn1"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"regexp"
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"strconv"
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"strings"
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"time"
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"github.com/cloudflare/cfssl/auth"
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cferr "github.com/cloudflare/cfssl/errors"
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"github.com/cloudflare/cfssl/helpers"
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"github.com/cloudflare/cfssl/log"
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ocspConfig "github.com/cloudflare/cfssl/ocsp/config"
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)
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// A CSRWhitelist stores booleans for fields in the CSR. If a CSRWhitelist is
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// not present in a SigningProfile, all of these fields may be copied from the
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// CSR into the signed certificate. If a CSRWhitelist *is* present in a
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// SigningProfile, only those fields with a `true` value in the CSRWhitelist may
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// be copied from the CSR to the signed certificate. Note that some of these
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// fields, like Subject, can be provided or partially provided through the API.
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// Since API clients are expected to be trusted, but CSRs are not, fields
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// provided through the API are not subject to whitelisting through this
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// mechanism.
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type CSRWhitelist struct {
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Subject, PublicKeyAlgorithm, PublicKey, SignatureAlgorithm bool
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DNSNames, IPAddresses, EmailAddresses bool
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}
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// OID is our own version of asn1's ObjectIdentifier, so we can define a custom
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// JSON marshal / unmarshal.
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type OID asn1.ObjectIdentifier
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// CertificatePolicy represents the ASN.1 PolicyInformation structure from
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// https://tools.ietf.org/html/rfc3280.html#page-106.
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// Valid values of Type are "id-qt-unotice" and "id-qt-cps"
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type CertificatePolicy struct {
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ID OID
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Qualifiers []CertificatePolicyQualifier
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}
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// CertificatePolicyQualifier represents a single qualifier from an ASN.1
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// PolicyInformation structure.
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type CertificatePolicyQualifier struct {
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Type string
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Value string
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}
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// AuthRemote is an authenticated remote signer.
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type AuthRemote struct {
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RemoteName string `json:"remote"`
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AuthKeyName string `json:"auth_key"`
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}
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// CAConstraint specifies various CA constraints on the signed certificate.
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// CAConstraint would verify against (and override) the CA
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// extensions in the given CSR.
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type CAConstraint struct {
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IsCA bool `json:"is_ca"`
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MaxPathLen int `json:"max_path_len"`
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MaxPathLenZero bool `json:"max_path_len_zero"`
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}
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// A SigningProfile stores information that the CA needs to store
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// signature policy.
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type SigningProfile struct {
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Usage []string `json:"usages"`
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IssuerURL []string `json:"issuer_urls"`
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OCSP string `json:"ocsp_url"`
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CRL string `json:"crl_url"`
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CAConstraint CAConstraint `json:"ca_constraint"`
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OCSPNoCheck bool `json:"ocsp_no_check"`
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ExpiryString string `json:"expiry"`
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BackdateString string `json:"backdate"`
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AuthKeyName string `json:"auth_key"`
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RemoteName string `json:"remote"`
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NotBefore time.Time `json:"not_before"`
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NotAfter time.Time `json:"not_after"`
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NameWhitelistString string `json:"name_whitelist"`
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AuthRemote AuthRemote `json:"auth_remote"`
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CTLogServers []string `json:"ct_log_servers"`
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AllowedExtensions []OID `json:"allowed_extensions"`
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CertStore string `json:"cert_store"`
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Policies []CertificatePolicy
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Expiry time.Duration
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Backdate time.Duration
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Provider auth.Provider
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RemoteProvider auth.Provider
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RemoteServer string
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RemoteCAs *x509.CertPool
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ClientCert *tls.Certificate
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CSRWhitelist *CSRWhitelist
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NameWhitelist *regexp.Regexp
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ExtensionWhitelist map[string]bool
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ClientProvidesSerialNumbers bool
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}
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// UnmarshalJSON unmarshals a JSON string into an OID.
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func (oid *OID) UnmarshalJSON(data []byte) (err error) {
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if data[0] != '"' || data[len(data)-1] != '"' {
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return errors.New("OID JSON string not wrapped in quotes." + string(data))
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}
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data = data[1 : len(data)-1]
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parsedOid, err := parseObjectIdentifier(string(data))
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if err != nil {
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return err
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}
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*oid = OID(parsedOid)
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return
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}
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// MarshalJSON marshals an oid into a JSON string.
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func (oid OID) MarshalJSON() ([]byte, error) {
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return []byte(fmt.Sprintf(`"%v"`, asn1.ObjectIdentifier(oid))), nil
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}
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func parseObjectIdentifier(oidString string) (oid asn1.ObjectIdentifier, err error) {
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validOID, err := regexp.MatchString("\\d(\\.\\d+)*", oidString)
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if err != nil {
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return
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}
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if !validOID {
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err = errors.New("Invalid OID")
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return
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}
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segments := strings.Split(oidString, ".")
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oid = make(asn1.ObjectIdentifier, len(segments))
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for i, intString := range segments {
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oid[i], err = strconv.Atoi(intString)
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if err != nil {
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return
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}
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}
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return
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}
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const timeFormat = "2006-01-02T15:04:05"
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// populate is used to fill in the fields that are not in JSON
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//
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// First, the ExpiryString parameter is needed to parse
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// expiration timestamps from JSON. The JSON decoder is not able to
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// decode a string time duration to a time.Duration, so this is called
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// when loading the configuration to properly parse and fill out the
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// Expiry parameter.
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// This function is also used to create references to the auth key
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// and default remote for the profile.
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// It returns true if ExpiryString is a valid representation of a
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// time.Duration, and the AuthKeyString and RemoteName point to
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// valid objects. It returns false otherwise.
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func (p *SigningProfile) populate(cfg *Config) error {
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if p == nil {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("can't parse nil profile"))
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}
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var err error
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if p.RemoteName == "" && p.AuthRemote.RemoteName == "" {
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log.Debugf("parse expiry in profile")
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if p.ExpiryString == "" {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("empty expiry string"))
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}
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dur, err := time.ParseDuration(p.ExpiryString)
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if err != nil {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
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}
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log.Debugf("expiry is valid")
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p.Expiry = dur
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if p.BackdateString != "" {
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dur, err = time.ParseDuration(p.BackdateString)
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if err != nil {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
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}
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p.Backdate = dur
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}
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if !p.NotBefore.IsZero() && !p.NotAfter.IsZero() && p.NotAfter.Before(p.NotBefore) {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, err)
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}
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if len(p.Policies) > 0 {
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for _, policy := range p.Policies {
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for _, qualifier := range policy.Qualifiers {
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if qualifier.Type != "" && qualifier.Type != "id-qt-unotice" && qualifier.Type != "id-qt-cps" {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("invalid policy qualifier type"))
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}
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}
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}
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}
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} else if p.RemoteName != "" {
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log.Debug("match remote in profile to remotes section")
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if p.AuthRemote.RemoteName != "" {
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log.Error("profile has both a remote and an auth remote specified")
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return cferr.New(cferr.PolicyError, cferr.InvalidPolicy)
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}
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if remote := cfg.Remotes[p.RemoteName]; remote != "" {
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if err := p.updateRemote(remote); err != nil {
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return err
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}
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} else {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("failed to find remote in remotes section"))
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}
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} else {
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log.Debug("match auth remote in profile to remotes section")
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if remote := cfg.Remotes[p.AuthRemote.RemoteName]; remote != "" {
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if err := p.updateRemote(remote); err != nil {
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return err
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}
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} else {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("failed to find remote in remotes section"))
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}
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}
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if p.AuthKeyName != "" {
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log.Debug("match auth key in profile to auth_keys section")
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if key, ok := cfg.AuthKeys[p.AuthKeyName]; ok == true {
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if key.Type == "standard" {
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p.Provider, err = auth.New(key.Key, nil)
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if err != nil {
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log.Debugf("failed to create new standard auth provider: %v", err)
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("failed to create new standard auth provider"))
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}
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} else {
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log.Debugf("unknown authentication type %v", key.Type)
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("unknown authentication type"))
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}
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} else {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("failed to find auth_key in auth_keys section"))
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}
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}
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if p.AuthRemote.AuthKeyName != "" {
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log.Debug("match auth remote key in profile to auth_keys section")
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if key, ok := cfg.AuthKeys[p.AuthRemote.AuthKeyName]; ok == true {
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if key.Type == "standard" {
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p.RemoteProvider, err = auth.New(key.Key, nil)
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if err != nil {
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log.Debugf("failed to create new standard auth provider: %v", err)
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("failed to create new standard auth provider"))
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}
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} else {
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log.Debugf("unknown authentication type %v", key.Type)
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("unknown authentication type"))
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}
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} else {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("failed to find auth_remote's auth_key in auth_keys section"))
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}
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}
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if p.NameWhitelistString != "" {
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log.Debug("compiling whitelist regular expression")
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rule, err := regexp.Compile(p.NameWhitelistString)
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if err != nil {
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return cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("failed to compile name whitelist section"))
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}
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p.NameWhitelist = rule
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}
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p.ExtensionWhitelist = map[string]bool{}
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for _, oid := range p.AllowedExtensions {
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p.ExtensionWhitelist[asn1.ObjectIdentifier(oid).String()] = true
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}
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return nil
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}
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// updateRemote takes a signing profile and initializes the remote server object
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// to the hostname:port combination sent by remote.
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func (p *SigningProfile) updateRemote(remote string) error {
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if remote != "" {
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p.RemoteServer = remote
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}
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return nil
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}
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// OverrideRemotes takes a signing configuration and updates the remote server object
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// to the hostname:port combination sent by remote
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func (p *Signing) OverrideRemotes(remote string) error {
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if remote != "" {
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var err error
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for _, profile := range p.Profiles {
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err = profile.updateRemote(remote)
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if err != nil {
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return err
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}
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}
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err = p.Default.updateRemote(remote)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// SetClientCertKeyPairFromFile updates the properties to set client certificates for mutual
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// authenticated TLS remote requests
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func (p *Signing) SetClientCertKeyPairFromFile(certFile string, keyFile string) error {
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if certFile != "" && keyFile != "" {
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cert, err := helpers.LoadClientCertificate(certFile, keyFile)
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if err != nil {
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return err
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}
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for _, profile := range p.Profiles {
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profile.ClientCert = cert
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}
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p.Default.ClientCert = cert
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}
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return nil
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}
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// SetRemoteCAsFromFile reads root CAs from file and updates the properties to set remote CAs for TLS
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// remote requests
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func (p *Signing) SetRemoteCAsFromFile(caFile string) error {
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if caFile != "" {
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remoteCAs, err := helpers.LoadPEMCertPool(caFile)
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if err != nil {
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return err
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}
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p.SetRemoteCAs(remoteCAs)
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}
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return nil
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}
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// SetRemoteCAs updates the properties to set remote CAs for TLS
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// remote requests
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func (p *Signing) SetRemoteCAs(remoteCAs *x509.CertPool) {
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for _, profile := range p.Profiles {
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profile.RemoteCAs = remoteCAs
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}
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p.Default.RemoteCAs = remoteCAs
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}
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// NeedsRemoteSigner returns true if one of the profiles has a remote set
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func (p *Signing) NeedsRemoteSigner() bool {
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for _, profile := range p.Profiles {
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if profile.RemoteServer != "" {
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return true
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}
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}
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if p.Default.RemoteServer != "" {
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return true
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}
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return false
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}
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// NeedsLocalSigner returns true if one of the profiles doe not have a remote set
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func (p *Signing) NeedsLocalSigner() bool {
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for _, profile := range p.Profiles {
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if profile.RemoteServer == "" {
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return true
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}
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}
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if p.Default.RemoteServer == "" {
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return true
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}
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return false
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}
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// Usages parses the list of key uses in the profile, translating them
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// to a list of X.509 key usages and extended key usages. The unknown
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// uses are collected into a slice that is also returned.
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func (p *SigningProfile) Usages() (ku x509.KeyUsage, eku []x509.ExtKeyUsage, unk []string) {
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for _, keyUse := range p.Usage {
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if kuse, ok := KeyUsage[keyUse]; ok {
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ku |= kuse
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} else if ekuse, ok := ExtKeyUsage[keyUse]; ok {
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eku = append(eku, ekuse)
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} else {
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unk = append(unk, keyUse)
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}
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}
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return
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}
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// A valid profile must be a valid local profile or a valid remote profile.
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// A valid local profile has defined at least key usages to be used, and a
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// valid local default profile has defined at least a default expiration.
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// A valid remote profile (default or not) has remote signer initialized.
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// In addition, a remote profile must has a valid auth provider if auth
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// key defined.
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func (p *SigningProfile) validProfile(isDefault bool) bool {
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if p == nil {
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return false
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}
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if p.AuthRemote.RemoteName == "" && p.AuthRemote.AuthKeyName != "" {
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log.Debugf("invalid auth remote profile: no remote signer specified")
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return false
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}
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if p.RemoteName != "" {
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log.Debugf("validate remote profile")
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if p.RemoteServer == "" {
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log.Debugf("invalid remote profile: no remote signer specified")
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return false
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}
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if p.AuthKeyName != "" && p.Provider == nil {
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log.Debugf("invalid remote profile: auth key name is defined but no auth provider is set")
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return false
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}
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if p.AuthRemote.RemoteName != "" {
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log.Debugf("invalid remote profile: auth remote is also specified")
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return false
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}
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} else if p.AuthRemote.RemoteName != "" {
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log.Debugf("validate auth remote profile")
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if p.RemoteServer == "" {
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log.Debugf("invalid auth remote profile: no remote signer specified")
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return false
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}
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if p.AuthRemote.AuthKeyName == "" || p.RemoteProvider == nil {
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log.Debugf("invalid auth remote profile: no auth key is defined")
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return false
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}
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} else {
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log.Debugf("validate local profile")
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if !isDefault {
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if len(p.Usage) == 0 {
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log.Debugf("invalid local profile: no usages specified")
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return false
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} else if _, _, unk := p.Usages(); len(unk) == len(p.Usage) {
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log.Debugf("invalid local profile: no valid usages")
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return false
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}
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} else {
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if p.Expiry == 0 {
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log.Debugf("invalid local profile: no expiry set")
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return false
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}
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}
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}
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log.Debugf("profile is valid")
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return true
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}
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// This checks if the SigningProfile object contains configurations that are only effective with a local signer
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// which has access to CA private key.
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func (p *SigningProfile) hasLocalConfig() bool {
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if p.Usage != nil ||
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p.IssuerURL != nil ||
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p.OCSP != "" ||
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p.ExpiryString != "" ||
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p.BackdateString != "" ||
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p.CAConstraint.IsCA != false ||
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!p.NotBefore.IsZero() ||
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!p.NotAfter.IsZero() ||
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p.NameWhitelistString != "" ||
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len(p.CTLogServers) != 0 {
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return true
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}
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return false
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}
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// warnSkippedSettings prints a log warning message about skipped settings
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// in a SigningProfile, usually due to remote signer.
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func (p *Signing) warnSkippedSettings() {
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const warningMessage = `The configuration value by "usages", "issuer_urls", "ocsp_url", "crl_url", "ca_constraint", "expiry", "backdate", "not_before", "not_after", "cert_store" and "ct_log_servers" are skipped`
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if p == nil {
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return
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}
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if (p.Default.RemoteName != "" || p.Default.AuthRemote.RemoteName != "") && p.Default.hasLocalConfig() {
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log.Warning("default profile points to a remote signer: ", warningMessage)
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}
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for name, profile := range p.Profiles {
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if (profile.RemoteName != "" || profile.AuthRemote.RemoteName != "") && profile.hasLocalConfig() {
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log.Warningf("Profiles[%s] points to a remote signer: %s", name, warningMessage)
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}
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}
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}
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// Signing codifies the signature configuration policy for a CA.
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type Signing struct {
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Profiles map[string]*SigningProfile `json:"profiles"`
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Default *SigningProfile `json:"default"`
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}
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// Config stores configuration information for the CA.
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type Config struct {
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Signing *Signing `json:"signing"`
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OCSP *ocspConfig.Config `json:"ocsp"`
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AuthKeys map[string]AuthKey `json:"auth_keys,omitempty"`
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Remotes map[string]string `json:"remotes,omitempty"`
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}
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// Valid ensures that Config is a valid configuration. It should be
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// called immediately after parsing a configuration file.
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func (c *Config) Valid() bool {
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return c.Signing.Valid()
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}
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// Valid checks the signature policies, ensuring they are valid
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// policies. A policy is valid if it has defined at least key usages
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// to be used, and a valid default profile has defined at least a
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// default expiration.
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func (p *Signing) Valid() bool {
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if p == nil {
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return false
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}
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log.Debugf("validating configuration")
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if !p.Default.validProfile(true) {
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log.Debugf("default profile is invalid")
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return false
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}
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for _, sp := range p.Profiles {
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if !sp.validProfile(false) {
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log.Debugf("invalid profile")
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return false
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}
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}
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p.warnSkippedSettings()
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return true
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}
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// KeyUsage contains a mapping of string names to key usages.
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var KeyUsage = map[string]x509.KeyUsage{
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"signing": x509.KeyUsageDigitalSignature,
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"digital signature": x509.KeyUsageDigitalSignature,
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"content commitment": x509.KeyUsageContentCommitment,
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"key encipherment": x509.KeyUsageKeyEncipherment,
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"key agreement": x509.KeyUsageKeyAgreement,
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"data encipherment": x509.KeyUsageDataEncipherment,
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"cert sign": x509.KeyUsageCertSign,
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"crl sign": x509.KeyUsageCRLSign,
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"encipher only": x509.KeyUsageEncipherOnly,
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"decipher only": x509.KeyUsageDecipherOnly,
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}
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// ExtKeyUsage contains a mapping of string names to extended key
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// usages.
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var ExtKeyUsage = map[string]x509.ExtKeyUsage{
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"any": x509.ExtKeyUsageAny,
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"server auth": x509.ExtKeyUsageServerAuth,
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"client auth": x509.ExtKeyUsageClientAuth,
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"code signing": x509.ExtKeyUsageCodeSigning,
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"email protection": x509.ExtKeyUsageEmailProtection,
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"s/mime": x509.ExtKeyUsageEmailProtection,
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"ipsec end system": x509.ExtKeyUsageIPSECEndSystem,
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"ipsec tunnel": x509.ExtKeyUsageIPSECTunnel,
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"ipsec user": x509.ExtKeyUsageIPSECUser,
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"timestamping": x509.ExtKeyUsageTimeStamping,
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"ocsp signing": x509.ExtKeyUsageOCSPSigning,
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"microsoft sgc": x509.ExtKeyUsageMicrosoftServerGatedCrypto,
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"netscape sgc": x509.ExtKeyUsageNetscapeServerGatedCrypto,
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}
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// An AuthKey contains an entry for a key used for authentication.
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type AuthKey struct {
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// Type contains information needed to select the appropriate
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// constructor. For example, "standard" for HMAC-SHA-256,
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// "standard-ip" for HMAC-SHA-256 incorporating the client's
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// IP.
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Type string `json:"type"`
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// Key contains the key information, such as a hex-encoded
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// HMAC key.
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Key string `json:"key"`
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}
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// DefaultConfig returns a default configuration specifying basic key
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// usage and a 1 year expiration time. The key usages chosen are
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// signing, key encipherment, client auth and server auth.
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func DefaultConfig() *SigningProfile {
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d := helpers.OneYear
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return &SigningProfile{
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Usage: []string{"signing", "key encipherment", "server auth", "client auth"},
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Expiry: d,
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ExpiryString: "8760h",
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}
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}
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// LoadFile attempts to load the configuration file stored at the path
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// and returns the configuration. On error, it returns nil.
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func LoadFile(path string) (*Config, error) {
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log.Debugf("loading configuration file from %s", path)
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if path == "" {
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return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("invalid path"))
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}
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body, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("could not read configuration file"))
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}
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|
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return LoadConfig(body)
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}
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// LoadConfig attempts to load the configuration from a byte slice.
|
|
// On error, it returns nil.
|
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func LoadConfig(config []byte) (*Config, error) {
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var cfg = &Config{}
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err := json.Unmarshal(config, &cfg)
|
|
if err != nil {
|
|
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy,
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errors.New("failed to unmarshal configuration: "+err.Error()))
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}
|
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|
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if cfg.Signing == nil {
|
|
return nil, errors.New("No \"signing\" field present")
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|
}
|
|
|
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if cfg.Signing.Default == nil {
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|
log.Debugf("no default given: using default config")
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cfg.Signing.Default = DefaultConfig()
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} else {
|
|
if err := cfg.Signing.Default.populate(cfg); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
for k := range cfg.Signing.Profiles {
|
|
if err := cfg.Signing.Profiles[k].populate(cfg); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
if !cfg.Valid() {
|
|
return nil, cferr.Wrap(cferr.PolicyError, cferr.InvalidPolicy, errors.New("invalid configuration"))
|
|
}
|
|
|
|
log.Debugf("configuration ok")
|
|
return cfg, nil
|
|
}
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