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serverrequestcontext.go
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serverrequestcontext.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package lib
import (
"crypto/x509"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"strconv"
"strings"
"github.com/jmoiron/sqlx"
"github.com/cloudflare/cfssl/config"
"github.com/cloudflare/cfssl/log"
"github.com/cloudflare/cfssl/revoke"
"github.com/cloudflare/cfssl/signer"
gmux "github.com/gorilla/mux"
"github.com/hyperledger/fabric-ca/api"
"github.com/hyperledger/fabric-ca/lib/attr"
"github.com/hyperledger/fabric-ca/lib/server"
"github.com/hyperledger/fabric-ca/lib/server/idemix"
"github.com/hyperledger/fabric-ca/lib/spi"
"github.com/hyperledger/fabric-ca/util"
"github.com/hyperledger/fabric/common/attrmgr"
"github.com/pkg/errors"
)
// ServerRequestContext defines the functionality of a server request context object
type ServerRequestContext interface {
BasicAuthentication() (string, error)
TokenAuthentication() (string, error)
GetCaller() (spi.User, error)
HasRole(role string) error
ChunksToDeliver(string) (int, error)
GetReq() *http.Request
GetQueryParm(name string) string
GetBoolQueryParm(name string) (bool, error)
GetResp() http.ResponseWriter
GetCertificates(server.CertificateRequest, string) (*sqlx.Rows, error)
}
// serverRequestContextImpl represents an HTTP request/response context in the server
type serverRequestContextImpl struct {
req *http.Request
resp http.ResponseWriter
endpoint *serverEndpoint
ca *CA
enrollmentID string
enrollmentCert *x509.Certificate
ui spi.User
caller spi.User
body struct {
read bool // true after body is read
buf []byte // the body itself
err error // any error from reading the body
}
callerRoles map[string]bool
}
const (
registrarRole = "hf.Registrar.Roles"
)
// newServerRequestContext is the constructor for a serverRequestContextImpl
func newServerRequestContext(r *http.Request, w http.ResponseWriter, se *serverEndpoint) *serverRequestContextImpl {
return &serverRequestContextImpl{
req: r,
resp: w,
endpoint: se,
}
}
// BasicAuthentication authenticates the caller's username and password
// found in the authorization header and returns the username
func (ctx *serverRequestContextImpl) BasicAuthentication() (string, error) {
r := ctx.req
// Get the authorization header
authHdr := r.Header.Get("authorization")
if authHdr == "" {
return "", newHTTPErr(401, ErrNoAuthHdr, "No authorization header")
}
// Extract the username and password from the header
username, password, ok := r.BasicAuth()
if !ok {
return "", newAuthErr(ErrNoUserPass, "No user/pass in authorization header")
}
// Get the CA that is targeted by this request
ca, err := ctx.GetCA()
if err != nil {
return "", err
}
// Error if max enrollments is disabled for this CA
log.Debugf("ca.Config: %+v", ca.Config)
caMaxEnrollments := ca.Config.Registry.MaxEnrollments
if caMaxEnrollments == 0 {
return "", newAuthErr(ErrEnrollDisabled, "Enroll is disabled")
}
// Get the user info object for this user
ctx.ui, err = ca.registry.GetUser(username, nil)
if err != nil {
return "", newAuthErr(ErrInvalidUser, "Failed to get user: %s", err)
}
// Check the user's password and max enrollments if supported by registry
err = ctx.ui.Login(password, caMaxEnrollments)
if err != nil {
return "", newAuthErr(ErrInvalidPass, "Login failure: %s", err)
}
// Store the enrollment ID associated with this server request context
ctx.enrollmentID = username
ctx.caller, err = ctx.GetCaller()
if err != nil {
return "", err
}
// Return the username
return username, nil
}
// TokenAuthentication authenticates the caller by token
// in the authorization header.
// Returns the enrollment ID or error.
func (ctx *serverRequestContextImpl) TokenAuthentication() (string, error) {
r := ctx.req
// Get the authorization header
authHdr := r.Header.Get("authorization")
if authHdr == "" {
return "", newHTTPErr(401, ErrNoAuthHdr, "No authorization header")
}
// Get the CA
ca, err := ctx.GetCA()
if err != nil {
return "", err
}
// Get the request body
body, err := ctx.ReadBodyBytes()
if err != nil {
return "", err
}
if idemix.IsToken(authHdr) {
return ctx.ca.issuer.VerifyToken(authHdr, body)
}
return ctx.verifyX509Token(ca, authHdr, body)
}
func (ctx *serverRequestContextImpl) verifyX509Token(ca *CA, authHdr string, body []byte) (string, error) {
// Verify the token; the signature is over the header and body
cert, err2 := util.VerifyToken(ca.csp, authHdr, body)
if err2 != nil {
return "", newAuthErr(ErrInvalidToken, "Invalid token in authorization header: %s", err2)
}
// Make sure the caller's cert was issued by this CA
err2 = ca.VerifyCertificate(cert)
if err2 != nil {
return "", newAuthErr(ErrUntrustedCertificate, "Untrusted certificate: %s", err2)
}
id := util.GetEnrollmentIDFromX509Certificate(cert)
log.Debugf("Checking for revocation/expiration of certificate owned by '%s'", id)
// VerifyCertificate ensures that the certificate passed in hasn't
// expired and checks the CRL for the server.
expired, checked := revoke.VerifyCertificate(cert)
if !checked {
return "", newHTTPErr(401, ErrCertRevokeCheckFailure, "Failed while checking for revocation")
}
if expired {
return "", newAuthErr(ErrCertExpired,
"The certificate in the authorization header is a revoked or expired certificate")
}
aki := hex.EncodeToString(cert.AuthorityKeyId)
serial := util.GetSerialAsHex(cert.SerialNumber)
aki = strings.ToLower(strings.TrimLeft(aki, "0"))
serial = strings.ToLower(strings.TrimLeft(serial, "0"))
certs, err := ca.CertDBAccessor().GetCertificate(serial, aki)
if err != nil {
return "", newHTTPErr(500, ErrCertNotFound, "Failed searching certificates: %s", err)
}
if len(certs) == 0 {
return "", newAuthErr(ErrCertNotFound, "Certificate not found with AKI '%s' and serial '%s'", aki, serial)
}
for _, certificate := range certs {
if certificate.Status == "revoked" {
return "", newAuthErr(ErrCertRevoked, "The certificate in the authorization header is a revoked certificate")
}
}
ctx.enrollmentID = id
ctx.enrollmentCert = cert
ctx.caller, err = ctx.GetCaller()
if err != nil {
return "", err
}
log.Debugf("Successful token authentication of '%s'", id)
return id, nil
}
// GetECert returns the enrollment certificate of the caller, assuming
// token authentication was successful.
func (ctx *serverRequestContextImpl) GetECert() *x509.Certificate {
return ctx.enrollmentCert
}
// GetCA returns the CA to which this request is targeted and checks to make sure the database has been initialized
func (ctx *serverRequestContextImpl) GetCA() (*CA, error) {
_, err := ctx.getCA()
if err != nil {
return nil, errors.WithMessage(err, "Failed to get CA instance")
}
if ctx.ca.db == nil || !ctx.ca.db.IsInitialized() {
err := ctx.ca.initDB()
if err != nil {
return nil, errors.WithMessage(err, fmt.Sprintf("%s handler failed to initialize DB", strings.TrimLeft(ctx.req.URL.String(), "/")))
}
err = ctx.ca.issuer.Init(false, ctx.ca.db, ctx.ca.levels)
if err != nil {
return nil, nil
}
}
return ctx.ca, nil
}
// GetCA returns the CA to which this request is targeted
func (ctx *serverRequestContextImpl) getCA() (*CA, error) {
if ctx.ca == nil {
// Get the CA name
name, err := ctx.getCAName()
if err != nil {
return nil, err
}
// Get the CA by its name
ctx.ca, err = ctx.endpoint.Server.GetCA(name)
if err != nil {
return nil, err
}
}
return ctx.ca, nil
}
// GetAttrExtension returns an attribute extension to place into a signing request
func (ctx *serverRequestContextImpl) GetAttrExtension(attrReqs []*api.AttributeRequest, profile string) (*signer.Extension, error) {
ca, err := ctx.GetCA()
if err != nil {
return nil, err
}
ui, err := ca.registry.GetUser(ctx.enrollmentID, nil)
if err != nil {
return nil, err
}
allAttrs, _ := ui.GetAttributes(nil)
if attrReqs == nil {
attrReqs = getDefaultAttrReqs(allAttrs)
if attrReqs == nil {
// No attributes are being requested, so we are done
return nil, nil
}
}
attrs, err := ca.attrMgr.ProcessAttributeRequests(
convertAttrReqs(attrReqs),
convertAttrs(allAttrs),
)
if err != nil {
return nil, err
}
if attrs != nil {
buf, err := json.Marshal(attrs)
if err != nil {
errors.Wrap(err, "Failed to marshal attributes")
}
ext := &signer.Extension{
ID: config.OID(attrmgr.AttrOID),
Critical: false,
Value: hex.EncodeToString(buf),
}
log.Debugf("Attribute extension being added to certificate is: %+v", ext)
return ext, nil
}
return nil, nil
}
// caNameReqBody is a sparse request body to unmarshal only the CA name
type caNameReqBody struct {
CAName string `json:"caname,omitempty"`
}
// getCAName returns the targeted CA name for this request
func (ctx *serverRequestContextImpl) getCAName() (string, error) {
// Check the query parameters first
ca := ctx.req.URL.Query().Get("ca")
if ca != "" {
return ca, nil
}
// Next, check the request body, if there is one
var body caNameReqBody
_, err := ctx.TryReadBody(&body)
if err != nil {
return "", err
}
if body.CAName != "" {
return body.CAName, nil
}
// No CA name in the request body either, so use the default CA name
return ctx.endpoint.Server.CA.Config.CA.Name, nil
}
// ReadBody reads the request body and JSON unmarshals into 'body'
func (ctx *serverRequestContextImpl) ReadBody(body interface{}) error {
empty, err := ctx.TryReadBody(body)
if err != nil {
return err
}
if empty {
return newHTTPErr(400, ErrEmptyReqBody, "Empty request body")
}
return nil
}
// TryReadBody reads the request body into 'body' if not empty
func (ctx *serverRequestContextImpl) TryReadBody(body interface{}) (bool, error) {
buf, err := ctx.ReadBodyBytes()
if err != nil {
return false, err
}
empty := len(buf) == 0
if !empty {
err = json.Unmarshal(buf, body)
if err != nil {
return true, newHTTPErr(400, ErrBadReqBody, "Invalid request body: %s; body=%s",
err, string(buf))
}
}
return empty, nil
}
// ReadBodyBytes reads the request body and returns bytes
func (ctx *serverRequestContextImpl) ReadBodyBytes() ([]byte, error) {
if !ctx.body.read {
r := ctx.req
buf, err := ioutil.ReadAll(r.Body)
ctx.body.buf = buf
ctx.body.err = err
ctx.body.read = true
}
err := ctx.body.err
if err != nil {
return nil, newHTTPErr(400, ErrReadingReqBody, "Failed reading request body: %s", err)
}
return ctx.body.buf, nil
}
func (ctx *serverRequestContextImpl) GetUser(userName string) (spi.User, error) {
ca, err := ctx.getCA()
if err != nil {
return nil, err
}
registry := ca.registry
user, err := registry.GetUser(userName, nil)
if err != nil {
return nil, err
}
err = ctx.CanManageUser(user)
if err != nil {
return nil, err
}
return user, nil
}
// CanManageUser determines if the caller has the right type and affiliation to act on on a user
func (ctx *serverRequestContextImpl) CanManageUser(user spi.User) error {
userAff := strings.Join(user.GetAffiliationPath(), ".")
err := ctx.ContainsAffiliation(userAff)
if err != nil {
return err
}
userType := user.GetType()
err = ctx.CanActOnType(userType)
if err != nil {
return err
}
return nil
}
// CanModifyUser determines if the modifications to the user are allowed
func (ctx *serverRequestContextImpl) CanModifyUser(req *api.ModifyIdentityRequest, checkAff bool, checkType bool, checkAttrs bool, userToModify spi.User) error {
if checkAff {
reqAff := req.Affiliation
log.Debugf("Checking if caller is authorized to change affiliation to '%s'", reqAff)
err := ctx.ContainsAffiliation(reqAff)
if err != nil {
return err
}
}
if checkType {
reqType := req.Type
log.Debugf("Checking if caller is authorized to change type to '%s'", reqType)
err := ctx.CanActOnType(reqType)
if err != nil {
return err
}
}
if checkAttrs {
reqAttrs := req.Attributes
log.Debugf("Checking if caller is authorized to change attributes to %+v", reqAttrs)
err := attr.CanRegisterRequestedAttributes(reqAttrs, userToModify, ctx.caller)
if err != nil {
return newAuthErr(ErrRegAttrAuth, "Failed to register attributes: %s", err)
}
}
return nil
}
// GetCaller gets the user who is making this server request
func (ctx *serverRequestContextImpl) GetCaller() (spi.User, error) {
if ctx.caller != nil {
return ctx.caller, nil
}
var err error
id := ctx.enrollmentID
if id == "" {
return nil, newAuthErr(ErrCallerIsNotAuthenticated, "Caller is not authenticated")
}
ca, err := ctx.GetCA()
if err != nil {
return nil, err
}
// Get the user info object for this user
ctx.caller, err = ca.registry.GetUser(id, nil)
if err != nil {
return nil, newAuthErr(ErrGettingUser, "Failed to get user")
}
return ctx.caller, nil
}
// ContainsAffiliation returns an error if the requested affiliation does not contain the caller's affiliation
func (ctx *serverRequestContextImpl) ContainsAffiliation(affiliation string) error {
validAffiliation, err := ctx.containsAffiliation(affiliation)
if err != nil {
return newHTTPErr(500, ErrGettingAffiliation, "Failed to validate if caller has authority to get ID: %s", err)
}
if !validAffiliation {
return newAuthErr(ErrCallerNotAffiliated, "Caller does not have authority to act on affiliation '%s'", affiliation)
}
return nil
}
// containsAffiliation returns true if the requested affiliation contains the caller's affiliation
func (ctx *serverRequestContextImpl) containsAffiliation(affiliation string) (bool, error) {
caller, err := ctx.GetCaller()
if err != nil {
return false, err
}
callerAffiliationPath := GetUserAffiliation(caller)
log.Debugf("Checking to see if affiliation '%s' contains caller's affiliation '%s'", affiliation, callerAffiliationPath)
// If the caller has root affiliation return "true"
if callerAffiliationPath == "" {
log.Debug("Caller has root affiliation")
return true, nil
}
if affiliation == callerAffiliationPath {
return true, nil
}
callerAffiliationPath = callerAffiliationPath + "."
if strings.HasPrefix(affiliation, callerAffiliationPath) {
return true, nil
}
return false, nil
}
// IsRegistrar returns an error if the caller is not a registrar
func (ctx *serverRequestContextImpl) IsRegistrar() error {
_, isRegistrar, err := ctx.isRegistrar()
if err != nil {
return err
}
if !isRegistrar {
return newAuthErr(ErrMissingRegAttr, "Caller is not a registrar")
}
return nil
}
// isRegistrar returns back true if the caller is a registrar along with the types the registrar is allowed to register
func (ctx *serverRequestContextImpl) isRegistrar() (string, bool, error) {
caller, err := ctx.GetCaller()
if err != nil {
return "", false, err
}
log.Debugf("Checking to see if caller '%s' is a registrar", caller.GetName())
rolesStr, err := caller.GetAttribute("hf.Registrar.Roles")
if err != nil {
return "", false, newAuthErr(ErrRegAttrAuth, "'%s' is not a registrar", caller.GetName())
}
// Has some value for attribute 'hf.Registrar.Roles' then user is a registrar
if rolesStr.Value != "" {
return rolesStr.Value, true, nil
}
return "", false, nil
}
// CanActOnType returns true if the caller has the proper authority to take action on specific type
func (ctx *serverRequestContextImpl) CanActOnType(userType string) error {
canAct, err := ctx.canActOnType(userType)
if err != nil {
return newHTTPErr(500, ErrGettingType, "Failed to verify if user can act on type '%s': %s", userType, err)
}
if !canAct {
return newAuthErr(ErrCallerNotAffiliated, "Registrar does not have authority to act on type '%s'", userType)
}
return nil
}
func (ctx *serverRequestContextImpl) canActOnType(requestedType string) (bool, error) {
caller, err := ctx.GetCaller()
if err != nil {
return false, err
}
log.Debugf("Checking to see if caller '%s' can act on type '%s'", caller.GetName(), requestedType)
typesStr, isRegistrar, err := ctx.isRegistrar()
if err != nil {
return false, err
}
if !isRegistrar {
return false, newAuthErr(ErrRegAttrAuth, "'%s' is not allowed to manage users", caller.GetName())
}
if util.ListContains(typesStr, "*") {
return true, nil
}
var types []string
if typesStr != "" {
types = strings.Split(typesStr, ",")
} else {
types = make([]string, 0)
}
if requestedType == "" {
requestedType = "client"
}
if !util.StrContained(requestedType, types) {
log.Debugf("Caller with types '%s' is not authorized to act on '%s'", types, requestedType)
return false, nil
}
return true, nil
}
// HasRole returns an error if the caller does not have the attribute or the value is false for a boolean attribute
func (ctx *serverRequestContextImpl) HasRole(role string) error {
hasRole, err := ctx.hasRole(role)
if err != nil {
return err
}
if !hasRole {
return newHTTPErr(400, ErrMissingRole, "Caller has a value of 'false' for attribute/role '%s'", role)
}
return nil
}
// HasRole returns true if the caller has the attribute and value of the attribute is true
func (ctx *serverRequestContextImpl) hasRole(role string) (bool, error) {
if ctx.callerRoles == nil {
ctx.callerRoles = make(map[string]bool)
}
roleStatus, hasRole := ctx.callerRoles[role]
if hasRole {
return roleStatus, nil
}
caller, err := ctx.GetCaller()
if err != nil {
return false, err
}
roleAttr, err := caller.GetAttribute(role)
if err != nil {
return false, err
}
roleStatus, err = strconv.ParseBool(roleAttr.Value)
if err != nil {
return false, errors.Wrap(err, fmt.Sprintf("Failed to get boolean value of '%s'", role))
}
ctx.callerRoles[role] = roleStatus
return ctx.callerRoles[role], nil
}
// GetVar returns the parameter path variable from the URL
func (ctx *serverRequestContextImpl) GetVar(name string) (string, error) {
vars := gmux.Vars(ctx.req)
if vars == nil {
return "", newHTTPErr(500, ErrHTTPRequest, "Failed to correctly handle HTTP request")
}
value := vars[name]
return value, nil
}
// GetBoolQueryParm returns query parameter from the URL
func (ctx *serverRequestContextImpl) GetBoolQueryParm(name string) (bool, error) {
var err error
value := false
param := ctx.req.URL.Query().Get(name)
if param != "" {
value, err = strconv.ParseBool(strings.ToLower(param))
if err != nil {
return false, newHTTPErr(400, ErrUpdateConfigRemoveAff, "Failed to correctly parse value of '%s' query parameter: %s", name, err)
}
}
return value, nil
}
// GetQueryParm returns the value of query param based on name
func (ctx *serverRequestContextImpl) GetQueryParm(name string) string {
return ctx.req.URL.Query().Get(name)
}
// GetReq returns the http.Request
func (ctx *serverRequestContextImpl) GetReq() *http.Request {
return ctx.req
}
// GetResp returns the http.ResponseWriter
func (ctx *serverRequestContextImpl) GetResp() http.ResponseWriter {
return ctx.resp
}
// GetCertificates executes the DB query to get back certificates based on the filters passed in
func (ctx *serverRequestContextImpl) GetCertificates(req server.CertificateRequest, callerAff string) (*sqlx.Rows, error) {
return ctx.ca.certDBAccessor.GetCertificates(req, callerAff)
}
// ChunksToDeliver returns the number of chunks to deliver per flush
func (ctx *serverRequestContextImpl) ChunksToDeliver(envVar string) (int, error) {
var chunkSize int
var err error
if envVar == "" {
chunkSize = 100
} else {
chunkSize, err = strconv.Atoi(envVar)
if err != nil {
return 0, newHTTPErr(500, ErrParsingIntEnvVar, "Incorrect format specified for environment variable '%s', an integer value is required: %s", envVar, err)
}
}
return chunkSize, nil
}
// Registry returns the registry for the ca
func (ctx *serverRequestContextImpl) GetRegistry() spi.UserRegistry {
return ctx.ca.registry
}
func (ctx *serverRequestContextImpl) GetCAConfig() *CAConfig {
return ctx.ca.Config
}
func convertAttrReqs(attrReqs []*api.AttributeRequest) []attrmgr.AttributeRequest {
rtn := make([]attrmgr.AttributeRequest, len(attrReqs))
for i := range attrReqs {
rtn[i] = attrmgr.AttributeRequest(attrReqs[i])
}
return rtn
}
func convertAttrs(attrs []api.Attribute) []attrmgr.Attribute {
rtn := make([]attrmgr.Attribute, len(attrs))
for i := range attrs {
rtn[i] = attrmgr.Attribute(&attrs[i])
}
return rtn
}
// Return attribute requests for attributes which should by default be added to an ECert
func getDefaultAttrReqs(attrs []api.Attribute) []*api.AttributeRequest {
count := 0
for _, attr := range attrs {
if attr.ECert {
count++
}
}
if count == 0 {
return nil
}
reqs := make([]*api.AttributeRequest, count)
count = 0
for _, attr := range attrs {
if attr.ECert {
reqs[count] = &api.AttributeRequest{Name: attr.Name}
count++
}
}
return reqs
}