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middleware.go
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middleware.go
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package gateway
import (
"context"
"errors"
"net/http"
"regexp"
"strconv"
"strings"
"time"
"github.com/treeverse/lakefs/pkg/auth"
"github.com/treeverse/lakefs/pkg/catalog"
gatewayerrors "github.com/treeverse/lakefs/pkg/gateway/errors"
"github.com/treeverse/lakefs/pkg/gateway/operations"
"github.com/treeverse/lakefs/pkg/gateway/path"
"github.com/treeverse/lakefs/pkg/gateway/sig"
"github.com/treeverse/lakefs/pkg/graveler"
"github.com/treeverse/lakefs/pkg/httputil"
"github.com/treeverse/lakefs/pkg/logging"
"github.com/treeverse/lakefs/pkg/permissions"
"github.com/treeverse/lakefs/pkg/stats"
)
func AuthenticationHandler(authService auth.GatewayService, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
user, err := auth.GetUser(ctx)
if err == nil {
ctx = logging.AddFields(ctx, logging.Fields{logging.UserFieldKey: user.Username})
req = req.WithContext(auth.WithUser(ctx, user))
next.ServeHTTP(w, req)
return
}
o := ctx.Value(ContextKeyOperation).(*operations.Operation)
authenticator := sig.ChainedAuthenticator(
sig.NewV4Authenticator(req),
sig.NewV2SigAuthenticator(req))
authContext, err := authenticator.Parse(req.Context())
if err != nil {
o.Log(req).WithError(err).Warn("failed to parse signature")
_ = o.EncodeError(w, req, getAPIErrOrDefault(err, gatewayerrors.ErrAccessDenied))
return
}
accessKeyID := authContext.GetAccessKeyID()
creds, err := authService.GetCredentials(ctx, accessKeyID)
logger := o.Log(req).WithField("key", accessKeyID)
if err != nil {
if !errors.Is(err, auth.ErrNotFound) {
logger.WithError(err).Warn("error getting access key")
_ = o.EncodeError(w, req, gatewayerrors.ErrInternalError.ToAPIErr())
} else {
logger.WithError(err).Warn("could not find access key")
_ = o.EncodeError(w, req, gatewayerrors.ErrAccessDenied.ToAPIErr())
}
return
}
err = authenticator.Verify(creds, o.FQDN)
logger = logger.WithField("authenticator", authenticator)
if err != nil {
logger.WithError(err).Warn("error verifying credentials for key")
_ = o.EncodeError(w, req, getAPIErrOrDefault(err, gatewayerrors.ErrAccessDenied))
return
}
user, err = authService.GetUser(ctx, creds.Username)
if err != nil {
logger.WithError(err).Warn("could not get user for credentials key")
_ = o.EncodeError(w, req, gatewayerrors.ErrAccessDenied.ToAPIErr())
return
}
ctx = logging.AddFields(ctx, logging.Fields{logging.UserFieldKey: user.Username})
ctx = auth.WithUser(ctx, user)
ctx = context.WithValue(ctx, ContextKeyAuthContext, authContext)
req = req.WithContext(ctx)
next.ServeHTTP(w, req)
})
}
func EnrichWithParts(bareDomains []string, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
parts := ParseRequestParts(req.Host, req.URL.Path, bareDomains)
ctx = context.WithValue(ctx, ContextKeyRepositoryID, parts.Repository)
ctx = context.WithValue(ctx, ContextKeyRef, parts.Ref)
ctx = context.WithValue(ctx, ContextKeyPath, parts.Path)
ctx = context.WithValue(ctx, ContextKeyMatchedHost, parts.MatchedHost)
req = req.WithContext(ctx)
next.ServeHTTP(w, req)
})
}
func getBareDomain(hostname string, bareDomains []string) string {
for _, bd := range bareDomains {
if hostname == stripPort(bd) || strings.HasSuffix(hostname, "."+stripPort(bd)) {
return bd
}
}
// If no matching bare domain found, assume no gateways.s3.domain_name setting existing,
// and we're using path-based routing, with whichever domain our Host header specifies.
return hostname
}
var trailingPortRegexp = regexp.MustCompile(`:\d+$`)
func stripPort(host string) string {
return trailingPortRegexp.ReplaceAllString(host, "")
}
func EnrichWithOperation(sc *ServerContext, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
client := httputil.GetRequestLakeFSClient(req)
o := &operations.Operation{
Region: sc.region,
FQDN: getBareDomain(stripPort(req.Host), sc.bareDomains),
Catalog: sc.catalog,
MultipartTracker: sc.multipartTracker,
BlockStore: sc.blockStore,
Auth: sc.authService,
Incr: func(action, userID, repository, ref string) {
logging.FromContext(ctx).
WithFields(logging.Fields{
"action": action,
"message_type": "action",
"repository": repository,
"ref": ref,
"user_id": userID,
}).
Debug("performing S3 action")
sc.stats.CollectEvent(stats.Event{
Class: "s3_gateway",
Name: action,
Repository: repository,
Ref: ref,
UserID: userID,
Client: client,
})
},
PathProvider: sc.pathProvider,
}
next.ServeHTTP(w, req.WithContext(context.WithValue(ctx, ContextKeyOperation, o)))
})
}
func DurationHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
o := ctx.Value(ContextKeyOperation).(*operations.Operation)
start := time.Now()
mrw := httputil.NewMetricResponseWriter(w)
next.ServeHTTP(mrw, req)
requestHistograms.WithLabelValues(string(o.OperationID), strconv.Itoa(mrw.StatusCode)).Observe(time.Since(start).Seconds())
})
}
func EnrichWithRepositoryOrFallback(c catalog.Interface, authService auth.GatewayService, fallbackProxy http.Handler, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
repoID := ctx.Value(ContextKeyRepositoryID).(string)
user, _ := auth.GetUser(ctx)
username := user.Username
o := ctx.Value(ContextKeyOperation).(*operations.Operation)
if repoID == "" {
// action without repo
next.ServeHTTP(w, req)
return
}
repo, err := c.GetRepository(ctx, repoID)
if errors.Is(err, graveler.ErrNotFound) {
authResp, authErr := authService.Authorize(ctx, &auth.AuthorizationRequest{
Username: username,
RequiredPermissions: permissions.Node{
Permission: permissions.Permission{Action: permissions.ListRepositoriesAction, Resource: "*"},
},
})
if authErr != nil || authResp.Error != nil || !authResp.Allowed {
_ = o.EncodeError(w, req, gatewayerrors.ErrAccessDenied.ToAPIErr())
return
}
if fallbackProxy != nil {
fallbackProxy.ServeHTTP(w, req)
return
}
_ = o.EncodeError(w, req, gatewayerrors.ErrNoSuchBucket.ToAPIErr())
return
}
if repo == nil {
_ = o.EncodeError(w, req, gatewayerrors.ErrInternalError.ToAPIErr())
return
}
req = req.WithContext(context.WithValue(ctx, ContextKeyRepository, repo))
next.ServeHTTP(w, req)
})
}
func OperationLookupHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
o := ctx.Value(ContextKeyOperation).(*operations.Operation)
repoID := ctx.Value(ContextKeyRepositoryID).(string)
o.OperationID = operations.OperationIDOperationNotFound
if repoID == "" {
if req.Method == http.MethodGet {
o.OperationID = operations.OperationIDListBuckets
} else {
_ = o.EncodeError(w, req, gatewayerrors.ERRLakeFSNotSupported.ToAPIErr())
return
}
} else {
ref := ctx.Value(ContextKeyRef).(string)
pth := ctx.Value(ContextKeyPath).(string)
switch {
case ref != "" && pth != "":
req = req.WithContext(ctx)
o.OperationID = pathBasedOperationID(req.Method)
case ref == "" && pth == "":
o.OperationID = repositoryBasedOperationID(req.Method)
default:
w.WriteHeader(http.StatusNotFound)
return
}
}
req = req.WithContext(logging.AddFields(ctx, logging.Fields{"operation_id": o.OperationID}))
next.ServeHTTP(w, req)
})
}
// memberFold returns true if 'a' is equal case-folded to a member of bs.
func memberFold(a string, bs []string) bool {
for _, b := range bs {
if strings.EqualFold(a, b) {
return true
}
}
return false
}
type RequestParts struct {
Repository string
Ref string
Path string
MatchedHost bool
}
// ParseRequestParts returns the repo id, ref and path according to whether the request is path-style or virtual-host-style.
func ParseRequestParts(host string, urlPath string, bareDomains []string) RequestParts {
var parts RequestParts
urlPath = strings.TrimPrefix(urlPath, path.Separator)
var p []string
ourHosts := httputil.HostsOnly(bareDomains)
// we need to check using this order:
// 1. if exact hosts, path based
// 2. if suffixes, virtual host
// 3. none of the above, path based
if memberFold(httputil.HostOnly(host), ourHosts) {
// path style: extract repo from first part
p = strings.SplitN(urlPath, path.Separator, 3) //nolint: gomnd
parts.Repository = p[0]
if len(p) >= 1 {
p = p[1:]
}
parts.MatchedHost = true
} else {
// virtual host style: extract repo from subdomain
host := httputil.HostOnly(host)
for _, ourHost := range ourHosts {
if strings.HasSuffix(host, ourHost) {
parts.Repository = strings.TrimSuffix(host, "."+ourHost)
parts.MatchedHost = true
break
}
}
if parts.MatchedHost {
p = strings.SplitN(urlPath, path.Separator, 2) //nolint: gomnd
}
}
if !parts.MatchedHost {
// assume path based for domains we don't explicitly know
p = strings.SplitN(urlPath, path.Separator, 3) //nolint: gomnd
parts.Repository = p[0]
if len(p) >= 1 {
p = p[1:]
}
}
// extract ref and path from remaining parts
if len(p) > 0 {
parts.Ref = p[0]
}
if len(p) > 1 {
parts.Path = p[1]
}
return parts
}
func pathBasedOperationID(method string) operations.OperationID {
switch method {
case http.MethodDelete:
return operations.OperationIDDeleteObject
case http.MethodPost:
return operations.OperationIDPostObject
case http.MethodGet:
return operations.OperationIDGetObject
case http.MethodHead:
return operations.OperationIDHeadObject
case http.MethodPut:
return operations.OperationIDPutObject
default:
return operations.OperationIDOperationNotFound
}
}
func repositoryBasedOperationID(method string) operations.OperationID {
switch method {
case http.MethodDelete:
return operations.OperationIDUnsupportedOperation
case http.MethodPut:
return operations.OperationIDPutBucket
case http.MethodHead:
return operations.OperationIDHeadBucket
case http.MethodPost:
return operations.OperationIDDeleteObjects
case http.MethodGet:
return operations.OperationIDListObjects
default:
return operations.OperationIDOperationNotFound
}
}