vendor
This commit is contained in:
Mikaël Cluseau
432
vendor/github.com/cloudflare/cfssl/csr/csr.go
generated
vendored
Normal file
432
vendor/github.com/cloudflare/cfssl/csr/csr.go
generated
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// Package csr implements certificate requests for CFSSL.
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package csr
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/asn1"
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"encoding/pem"
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"errors"
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"net"
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"net/mail"
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"strings"
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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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)
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const (
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curveP256 = 256
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curveP384 = 384
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curveP521 = 521
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)
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// A Name contains the SubjectInfo fields.
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type Name struct {
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C string // Country
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ST string // State
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L string // Locality
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O string // OrganisationName
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OU string // OrganisationalUnitName
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SerialNumber string
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}
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// A KeyRequest is a generic request for a new key.
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type KeyRequest interface {
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Algo() string
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Size() int
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Generate() (crypto.PrivateKey, error)
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SigAlgo() x509.SignatureAlgorithm
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}
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// A BasicKeyRequest contains the algorithm and key size for a new private key.
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type BasicKeyRequest struct {
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A string `json:"algo" yaml:"algo"`
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S int `json:"size" yaml:"size"`
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}
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// NewBasicKeyRequest returns a default BasicKeyRequest.
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func NewBasicKeyRequest() *BasicKeyRequest {
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return &BasicKeyRequest{"ecdsa", curveP256}
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}
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// Algo returns the requested key algorithm represented as a string.
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func (kr *BasicKeyRequest) Algo() string {
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return kr.A
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}
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// Size returns the requested key size.
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func (kr *BasicKeyRequest) Size() int {
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return kr.S
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}
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// Generate generates a key as specified in the request. Currently,
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// only ECDSA and RSA are supported.
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func (kr *BasicKeyRequest) Generate() (crypto.PrivateKey, error) {
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log.Debugf("generate key from request: algo=%s, size=%d", kr.Algo(), kr.Size())
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switch kr.Algo() {
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case "rsa":
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if kr.Size() < 2048 {
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return nil, errors.New("RSA key is too weak")
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}
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if kr.Size() > 8192 {
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return nil, errors.New("RSA key size too large")
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}
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return rsa.GenerateKey(rand.Reader, kr.Size())
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case "ecdsa":
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var curve elliptic.Curve
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switch kr.Size() {
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case curveP256:
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curve = elliptic.P256()
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case curveP384:
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curve = elliptic.P384()
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case curveP521:
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curve = elliptic.P521()
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default:
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return nil, errors.New("invalid curve")
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}
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return ecdsa.GenerateKey(curve, rand.Reader)
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default:
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return nil, errors.New("invalid algorithm")
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}
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}
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// SigAlgo returns an appropriate X.509 signature algorithm given the
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// key request's type and size.
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func (kr *BasicKeyRequest) SigAlgo() x509.SignatureAlgorithm {
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switch kr.Algo() {
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case "rsa":
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switch {
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case kr.Size() >= 4096:
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return x509.SHA512WithRSA
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case kr.Size() >= 3072:
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return x509.SHA384WithRSA
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case kr.Size() >= 2048:
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return x509.SHA256WithRSA
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default:
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return x509.SHA1WithRSA
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}
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case "ecdsa":
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switch kr.Size() {
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case curveP521:
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return x509.ECDSAWithSHA512
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case curveP384:
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return x509.ECDSAWithSHA384
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case curveP256:
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return x509.ECDSAWithSHA256
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default:
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return x509.ECDSAWithSHA1
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}
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default:
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return x509.UnknownSignatureAlgorithm
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}
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}
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// CAConfig is a section used in the requests initialising a new CA.
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type CAConfig struct {
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PathLength int `json:"pathlen" yaml:"pathlen"`
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PathLenZero bool `json:"pathlenzero" yaml:"pathlenzero"`
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Expiry string `json:"expiry" yaml:"expiry"`
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Backdate string `json:"backdate" yaml:"backdate"`
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}
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// A CertificateRequest encapsulates the API interface to the
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// certificate request functionality.
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type CertificateRequest struct {
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CN string
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Names []Name `json:"names" yaml:"names"`
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Hosts []string `json:"hosts" yaml:"hosts"`
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KeyRequest KeyRequest `json:"key,omitempty" yaml:"key,omitempty"`
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CA *CAConfig `json:"ca,omitempty" yaml:"ca,omitempty"`
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SerialNumber string `json:"serialnumber,omitempty" yaml:"serialnumber,omitempty"`
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}
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// New returns a new, empty CertificateRequest with a
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// BasicKeyRequest.
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func New() *CertificateRequest {
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return &CertificateRequest{
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KeyRequest: NewBasicKeyRequest(),
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}
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}
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// appendIf appends to a if s is not an empty string.
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func appendIf(s string, a *[]string) {
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if s != "" {
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*a = append(*a, s)
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}
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}
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// Name returns the PKIX name for the request.
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func (cr *CertificateRequest) Name() pkix.Name {
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var name pkix.Name
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name.CommonName = cr.CN
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for _, n := range cr.Names {
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appendIf(n.C, &name.Country)
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appendIf(n.ST, &name.Province)
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appendIf(n.L, &name.Locality)
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appendIf(n.O, &name.Organization)
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appendIf(n.OU, &name.OrganizationalUnit)
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}
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name.SerialNumber = cr.SerialNumber
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return name
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}
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// BasicConstraints CSR information RFC 5280, 4.2.1.9
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type BasicConstraints struct {
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IsCA bool `asn1:"optional"`
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MaxPathLen int `asn1:"optional,default:-1"`
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}
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// ParseRequest takes a certificate request and generates a key and
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// CSR from it. It does no validation -- caveat emptor. It will,
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// however, fail if the key request is not valid (i.e., an unsupported
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// curve or RSA key size). The lack of validation was specifically
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// chosen to allow the end user to define a policy and validate the
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// request appropriately before calling this function.
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func ParseRequest(req *CertificateRequest) (csr, key []byte, err error) {
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log.Info("received CSR")
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if req.KeyRequest == nil {
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req.KeyRequest = NewBasicKeyRequest()
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}
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log.Infof("generating key: %s-%d", req.KeyRequest.Algo(), req.KeyRequest.Size())
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priv, err := req.KeyRequest.Generate()
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if err != nil {
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err = cferr.Wrap(cferr.PrivateKeyError, cferr.GenerationFailed, err)
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return
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}
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switch priv := priv.(type) {
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case *rsa.PrivateKey:
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key = x509.MarshalPKCS1PrivateKey(priv)
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block := pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: key,
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}
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key = pem.EncodeToMemory(&block)
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case *ecdsa.PrivateKey:
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key, err = x509.MarshalECPrivateKey(priv)
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if err != nil {
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err = cferr.Wrap(cferr.PrivateKeyError, cferr.Unknown, err)
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return
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}
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block := pem.Block{
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Type: "EC PRIVATE KEY",
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Bytes: key,
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}
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key = pem.EncodeToMemory(&block)
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default:
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panic("Generate should have failed to produce a valid key.")
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}
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csr, err = Generate(priv.(crypto.Signer), req)
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if err != nil {
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log.Errorf("failed to generate a CSR: %v", err)
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err = cferr.Wrap(cferr.CSRError, cferr.BadRequest, err)
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}
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return
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}
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// ExtractCertificateRequest extracts a CertificateRequest from
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// x509.Certificate. It is aimed to used for generating a new certificate
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// from an existing certificate. For a root certificate, the CA expiry
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// length is calculated as the duration between cert.NotAfter and cert.NotBefore.
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func ExtractCertificateRequest(cert *x509.Certificate) *CertificateRequest {
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req := New()
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req.CN = cert.Subject.CommonName
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req.Names = getNames(cert.Subject)
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req.Hosts = getHosts(cert)
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req.SerialNumber = cert.Subject.SerialNumber
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if cert.IsCA {
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req.CA = new(CAConfig)
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// CA expiry length is calculated based on the input cert
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// issue date and expiry date.
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req.CA.Expiry = cert.NotAfter.Sub(cert.NotBefore).String()
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req.CA.PathLength = cert.MaxPathLen
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req.CA.PathLenZero = cert.MaxPathLenZero
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}
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return req
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}
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func getHosts(cert *x509.Certificate) []string {
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var hosts []string
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for _, ip := range cert.IPAddresses {
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hosts = append(hosts, ip.String())
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}
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for _, dns := range cert.DNSNames {
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hosts = append(hosts, dns)
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}
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for _, email := range cert.EmailAddresses {
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hosts = append(hosts, email)
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}
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return hosts
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}
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// getNames returns an array of Names from the certificate
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// It onnly cares about Country, Organization, OrganizationalUnit, Locality, Province
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func getNames(sub pkix.Name) []Name {
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// anonymous func for finding the max of a list of interger
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max := func(v1 int, vn ...int) (max int) {
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max = v1
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for i := 0; i < len(vn); i++ {
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if vn[i] > max {
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max = vn[i]
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}
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}
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return max
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}
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nc := len(sub.Country)
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norg := len(sub.Organization)
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nou := len(sub.OrganizationalUnit)
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nl := len(sub.Locality)
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np := len(sub.Province)
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n := max(nc, norg, nou, nl, np)
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names := make([]Name, n)
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for i := range names {
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if i < nc {
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names[i].C = sub.Country[i]
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}
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if i < norg {
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names[i].O = sub.Organization[i]
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}
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if i < nou {
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names[i].OU = sub.OrganizationalUnit[i]
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}
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if i < nl {
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names[i].L = sub.Locality[i]
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}
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if i < np {
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names[i].ST = sub.Province[i]
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}
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}
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return names
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}
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// A Generator is responsible for validating certificate requests.
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type Generator struct {
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Validator func(*CertificateRequest) error
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}
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// ProcessRequest validates and processes the incoming request. It is
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// a wrapper around a validator and the ParseRequest function.
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func (g *Generator) ProcessRequest(req *CertificateRequest) (csr, key []byte, err error) {
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log.Info("generate received request")
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err = g.Validator(req)
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if err != nil {
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log.Warningf("invalid request: %v", err)
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return nil, nil, err
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}
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csr, key, err = ParseRequest(req)
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if err != nil {
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return nil, nil, err
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}
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return
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}
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// IsNameEmpty returns true if the name has no identifying information in it.
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func IsNameEmpty(n Name) bool {
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empty := func(s string) bool { return strings.TrimSpace(s) == "" }
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if empty(n.C) && empty(n.ST) && empty(n.L) && empty(n.O) && empty(n.OU) {
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return true
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}
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return false
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}
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// Regenerate uses the provided CSR as a template for signing a new
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// CSR using priv.
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func Regenerate(priv crypto.Signer, csr []byte) ([]byte, error) {
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req, extra, err := helpers.ParseCSR(csr)
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if err != nil {
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return nil, err
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} else if len(extra) > 0 {
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return nil, errors.New("csr: trailing data in certificate request")
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}
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return x509.CreateCertificateRequest(rand.Reader, req, priv)
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}
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// Generate creates a new CSR from a CertificateRequest structure and
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// an existing key. The KeyRequest field is ignored.
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func Generate(priv crypto.Signer, req *CertificateRequest) (csr []byte, err error) {
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sigAlgo := helpers.SignerAlgo(priv)
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if sigAlgo == x509.UnknownSignatureAlgorithm {
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return nil, cferr.New(cferr.PrivateKeyError, cferr.Unavailable)
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}
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var tpl = x509.CertificateRequest{
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Subject: req.Name(),
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SignatureAlgorithm: sigAlgo,
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}
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for i := range req.Hosts {
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if ip := net.ParseIP(req.Hosts[i]); ip != nil {
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tpl.IPAddresses = append(tpl.IPAddresses, ip)
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} else if email, err := mail.ParseAddress(req.Hosts[i]); err == nil && email != nil {
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tpl.EmailAddresses = append(tpl.EmailAddresses, email.Address)
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} else {
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tpl.DNSNames = append(tpl.DNSNames, req.Hosts[i])
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}
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}
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if req.CA != nil {
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err = appendCAInfoToCSR(req.CA, &tpl)
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if err != nil {
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err = cferr.Wrap(cferr.CSRError, cferr.GenerationFailed, err)
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return
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}
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}
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csr, err = x509.CreateCertificateRequest(rand.Reader, &tpl, priv)
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if err != nil {
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log.Errorf("failed to generate a CSR: %v", err)
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err = cferr.Wrap(cferr.CSRError, cferr.BadRequest, err)
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return
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}
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block := pem.Block{
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Type: "CERTIFICATE REQUEST",
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Bytes: csr,
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}
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log.Info("encoded CSR")
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csr = pem.EncodeToMemory(&block)
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return
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}
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// appendCAInfoToCSR appends CAConfig BasicConstraint extension to a CSR
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func appendCAInfoToCSR(reqConf *CAConfig, csr *x509.CertificateRequest) error {
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pathlen := reqConf.PathLength
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if pathlen == 0 && !reqConf.PathLenZero {
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pathlen = -1
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}
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val, err := asn1.Marshal(BasicConstraints{true, pathlen})
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if err != nil {
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return err
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}
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csr.ExtraExtensions = []pkix.Extension{
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{
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Id: asn1.ObjectIdentifier{2, 5, 29, 19},
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Value: val,
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Critical: true,
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},
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}
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return nil
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}
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