456 lines
14 KiB
Go
456 lines
14 KiB
Go
package vault
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import (
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"fmt"
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"strings"
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"time"
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"github.com/armon/go-metrics"
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"github.com/hashicorp/go-multierror"
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"github.com/hashicorp/vault/helper/consts"
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"github.com/hashicorp/vault/helper/jsonutil"
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"github.com/hashicorp/vault/helper/policyutil"
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"github.com/hashicorp/vault/helper/strutil"
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"github.com/hashicorp/vault/helper/wrapping"
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"github.com/hashicorp/vault/logical"
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)
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// HandleRequest is used to handle a new incoming request
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func (c *Core) HandleRequest(req *logical.Request) (resp *logical.Response, err error) {
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c.stateLock.RLock()
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defer c.stateLock.RUnlock()
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if c.sealed {
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return nil, consts.ErrSealed
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}
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if c.standby {
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return nil, consts.ErrStandby
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}
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// Allowing writing to a path ending in / makes it extremely difficult to
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// understand user intent for the filesystem-like backends (generic,
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// cubbyhole) -- did they want a key named foo/ or did they want to write
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// to a directory foo/ with no (or forgotten) key, or...? It also affects
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// lookup, because paths ending in / are considered prefixes by some
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// backends. Basically, it's all just terrible, so don't allow it.
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if strings.HasSuffix(req.Path, "/") &&
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(req.Operation == logical.UpdateOperation ||
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req.Operation == logical.CreateOperation) {
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return logical.ErrorResponse("cannot write to a path ending in '/'"), nil
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}
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var auth *logical.Auth
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if c.router.LoginPath(req.Path) {
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resp, auth, err = c.handleLoginRequest(req)
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} else {
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resp, auth, err = c.handleRequest(req)
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}
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// Ensure we don't leak internal data
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if resp != nil {
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if resp.Secret != nil {
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resp.Secret.InternalData = nil
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}
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if resp.Auth != nil {
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resp.Auth.InternalData = nil
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}
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}
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// We are wrapping if there is anything to wrap (not a nil response) and a
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// TTL was specified for the token. Errors on a call should be returned to
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// the caller, so wrapping is turned off if an error is hit and the error
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// is logged to the audit log.
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wrapping := resp != nil &&
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err == nil &&
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!resp.IsError() &&
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resp.WrapInfo != nil &&
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resp.WrapInfo.TTL != 0
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if wrapping {
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cubbyResp, cubbyErr := c.wrapInCubbyhole(req, resp)
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// If not successful, returns either an error response from the
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// cubbyhole backend or an error; if either is set, set resp and err to
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// those and continue so that that's what we audit log. Otherwise
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// finish the wrapping and audit log that.
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if cubbyResp != nil || cubbyErr != nil {
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resp = cubbyResp
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err = cubbyErr
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} else {
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wrappingResp := &logical.Response{
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WrapInfo: resp.WrapInfo,
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Warnings: resp.Warnings,
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}
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resp = wrappingResp
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}
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}
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auditResp := resp
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// When unwrapping we want to log the actual response that will be written
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// out. We still want to return the raw value to avoid automatic updating
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// to any of it.
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if req.Path == "sys/wrapping/unwrap" &&
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resp != nil &&
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resp.Data != nil &&
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resp.Data[logical.HTTPRawBody] != nil {
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// Decode the JSON
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httpResp := &logical.HTTPResponse{}
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err := jsonutil.DecodeJSON(resp.Data[logical.HTTPRawBody].([]byte), httpResp)
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if err != nil {
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c.logger.Error("core: failed to unmarshal wrapped HTTP response for audit logging", "error", err)
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return nil, ErrInternalError
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}
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auditResp = logical.HTTPResponseToLogicalResponse(httpResp)
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}
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// Create an audit trail of the response
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if auditErr := c.auditBroker.LogResponse(auth, req, auditResp, c.auditedHeaders, err); auditErr != nil {
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c.logger.Error("core: failed to audit response", "request_path", req.Path, "error", auditErr)
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return nil, ErrInternalError
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}
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return
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}
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func (c *Core) handleRequest(req *logical.Request) (retResp *logical.Response, retAuth *logical.Auth, retErr error) {
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defer metrics.MeasureSince([]string{"core", "handle_request"}, time.Now())
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// Validate the token
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auth, te, ctErr := c.checkToken(req)
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// We run this logic first because we want to decrement the use count even in the case of an error
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if te != nil {
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// Attempt to use the token (decrement NumUses)
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var err error
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te, err = c.tokenStore.UseToken(te)
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if err != nil {
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c.logger.Error("core: failed to use token", "error", err)
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retErr = multierror.Append(retErr, ErrInternalError)
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return nil, nil, retErr
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}
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if te == nil {
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// Token has been revoked by this point
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retErr = multierror.Append(retErr, logical.ErrPermissionDenied)
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return nil, nil, retErr
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}
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if te.NumUses == -1 {
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// We defer a revocation until after logic has run, since this is a
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// valid request (this is the token's final use). We pass the ID in
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// directly just to be safe in case something else modifies te later.
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defer func(id string) {
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err = c.tokenStore.Revoke(id)
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if err != nil {
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c.logger.Error("core: failed to revoke token", "error", err)
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retResp = nil
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retAuth = nil
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retErr = multierror.Append(retErr, ErrInternalError)
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}
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if retResp != nil && retResp.Secret != nil &&
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// Some backends return a TTL even without a Lease ID
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retResp.Secret.LeaseID != "" {
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retResp = logical.ErrorResponse("Secret cannot be returned; token had one use left, so leased credentials were immediately revoked.")
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return
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}
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}(te.ID)
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}
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}
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if ctErr != nil {
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// If it is an internal error we return that, otherwise we
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// return invalid request so that the status codes can be correct
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var errType error
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switch ctErr {
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case ErrInternalError, logical.ErrPermissionDenied:
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errType = ctErr
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default:
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errType = logical.ErrInvalidRequest
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}
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if err := c.auditBroker.LogRequest(auth, req, c.auditedHeaders, ctErr); err != nil {
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c.logger.Error("core: failed to audit request", "path", req.Path, "error", err)
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}
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if errType != nil {
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retErr = multierror.Append(retErr, errType)
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}
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return logical.ErrorResponse(ctErr.Error()), auth, retErr
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}
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// Attach the display name
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req.DisplayName = auth.DisplayName
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// Create an audit trail of the request
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if err := c.auditBroker.LogRequest(auth, req, c.auditedHeaders, nil); err != nil {
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c.logger.Error("core: failed to audit request", "path", req.Path, "error", err)
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retErr = multierror.Append(retErr, ErrInternalError)
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return nil, auth, retErr
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}
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// Route the request
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resp, routeErr := c.router.Route(req)
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if resp != nil {
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// If wrapping is used, use the shortest between the request and response
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var wrapTTL time.Duration
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var wrapFormat string
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// Ensure no wrap info information is set other than, possibly, the TTL
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if resp.WrapInfo != nil {
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if resp.WrapInfo.TTL > 0 {
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wrapTTL = resp.WrapInfo.TTL
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}
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wrapFormat = resp.WrapInfo.Format
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resp.WrapInfo = nil
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}
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if req.WrapInfo != nil {
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if req.WrapInfo.TTL > 0 {
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switch {
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case wrapTTL == 0:
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wrapTTL = req.WrapInfo.TTL
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case req.WrapInfo.TTL < wrapTTL:
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wrapTTL = req.WrapInfo.TTL
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}
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}
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// If the wrap format hasn't been set by the response, set it to
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// the request format
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if req.WrapInfo.Format != "" && wrapFormat == "" {
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wrapFormat = req.WrapInfo.Format
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}
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}
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if wrapTTL > 0 {
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resp.WrapInfo = &wrapping.ResponseWrapInfo{
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TTL: wrapTTL,
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Format: wrapFormat,
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}
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}
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}
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// If there is a secret, we must register it with the expiration manager.
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// We exclude renewal of a lease, since it does not need to be re-registered
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if resp != nil && resp.Secret != nil && !strings.HasPrefix(req.Path, "sys/renew") &&
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!strings.HasPrefix(req.Path, "sys/leases/renew") {
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// Get the SystemView for the mount
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sysView := c.router.MatchingSystemView(req.Path)
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if sysView == nil {
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c.logger.Error("core: unable to retrieve system view from router")
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retErr = multierror.Append(retErr, ErrInternalError)
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return nil, auth, retErr
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}
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// Apply the default lease if none given
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if resp.Secret.TTL == 0 {
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resp.Secret.TTL = sysView.DefaultLeaseTTL()
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}
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// Limit the lease duration
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maxTTL := sysView.MaxLeaseTTL()
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if resp.Secret.TTL > maxTTL {
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resp.Secret.TTL = maxTTL
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}
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// Generic mounts should return the TTL but not register
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// for a lease as this provides a massive slowdown
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registerLease := true
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matchingBackend := c.router.MatchingBackend(req.Path)
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if matchingBackend == nil {
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c.logger.Error("core: unable to retrieve generic backend from router")
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retErr = multierror.Append(retErr, ErrInternalError)
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return nil, auth, retErr
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}
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if ptbe, ok := matchingBackend.(*PassthroughBackend); ok {
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if !ptbe.GeneratesLeases() {
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registerLease = false
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resp.Secret.Renewable = false
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}
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}
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if registerLease {
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leaseID, err := c.expiration.Register(req, resp)
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if err != nil {
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c.logger.Error("core: failed to register lease", "request_path", req.Path, "error", err)
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retErr = multierror.Append(retErr, ErrInternalError)
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return nil, auth, retErr
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}
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resp.Secret.LeaseID = leaseID
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}
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}
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// Only the token store is allowed to return an auth block, for any
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// other request this is an internal error. We exclude renewal of a token,
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// since it does not need to be re-registered
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if resp != nil && resp.Auth != nil && !strings.HasPrefix(req.Path, "auth/token/renew") {
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if !strings.HasPrefix(req.Path, "auth/token/") {
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c.logger.Error("core: unexpected Auth response for non-token backend", "request_path", req.Path)
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retErr = multierror.Append(retErr, ErrInternalError)
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return nil, auth, retErr
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}
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// Register with the expiration manager. We use the token's actual path
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// here because roles allow suffixes.
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te, err := c.tokenStore.Lookup(resp.Auth.ClientToken)
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if err != nil {
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c.logger.Error("core: failed to look up token", "error", err)
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retErr = multierror.Append(retErr, ErrInternalError)
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return nil, auth, retErr
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}
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if err := c.expiration.RegisterAuth(te.Path, resp.Auth); err != nil {
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c.tokenStore.Revoke(te.ID)
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c.logger.Error("core: failed to register token lease", "request_path", req.Path, "error", err)
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retErr = multierror.Append(retErr, ErrInternalError)
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return nil, auth, retErr
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}
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}
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if resp != nil &&
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req.Path == "cubbyhole/response" &&
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len(te.Policies) == 1 &&
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te.Policies[0] == responseWrappingPolicyName {
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resp.AddWarning("Reading from 'cubbyhole/response' is deprecated. Please use sys/wrapping/unwrap to unwrap responses, as it provides additional security checks and other benefits.")
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}
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// Return the response and error
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if routeErr != nil {
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retErr = multierror.Append(retErr, routeErr)
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}
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return resp, auth, retErr
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}
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// handleLoginRequest is used to handle a login request, which is an
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// unauthenticated request to the backend.
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func (c *Core) handleLoginRequest(req *logical.Request) (*logical.Response, *logical.Auth, error) {
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defer metrics.MeasureSince([]string{"core", "handle_login_request"}, time.Now())
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// Create an audit trail of the request, auth is not available on login requests
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if err := c.auditBroker.LogRequest(nil, req, c.auditedHeaders, nil); err != nil {
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c.logger.Error("core: failed to audit request", "path", req.Path, "error", err)
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return nil, nil, ErrInternalError
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}
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// The token store uses authentication even when creating a new token,
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// so it's handled in handleRequest. It should not be reached here.
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if strings.HasPrefix(req.Path, "auth/token/") {
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c.logger.Error("core: unexpected login request for token backend", "request_path", req.Path)
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return nil, nil, ErrInternalError
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}
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// Route the request
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resp, routeErr := c.router.Route(req)
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if resp != nil {
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// If wrapping is used, use the shortest between the request and response
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var wrapTTL time.Duration
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var wrapFormat string
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// Ensure no wrap info information is set other than, possibly, the TTL
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if resp.WrapInfo != nil {
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if resp.WrapInfo.TTL > 0 {
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wrapTTL = resp.WrapInfo.TTL
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}
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wrapFormat = resp.WrapInfo.Format
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resp.WrapInfo = nil
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}
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if req.WrapInfo != nil {
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if req.WrapInfo.TTL > 0 {
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switch {
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case wrapTTL == 0:
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wrapTTL = req.WrapInfo.TTL
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case req.WrapInfo.TTL < wrapTTL:
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wrapTTL = req.WrapInfo.TTL
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}
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}
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if req.WrapInfo.Format != "" && wrapFormat == "" {
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wrapFormat = req.WrapInfo.Format
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}
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}
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if wrapTTL > 0 {
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resp.WrapInfo = &wrapping.ResponseWrapInfo{
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TTL: wrapTTL,
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Format: wrapFormat,
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}
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}
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}
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// A login request should never return a secret!
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if resp != nil && resp.Secret != nil {
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c.logger.Error("core: unexpected Secret response for login path", "request_path", req.Path)
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return nil, nil, ErrInternalError
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}
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// If the response generated an authentication, then generate the token
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var auth *logical.Auth
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if resp != nil && resp.Auth != nil {
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auth = resp.Auth
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if strutil.StrListSubset(auth.Policies, []string{"root"}) {
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return logical.ErrorResponse("authentication backends cannot create root tokens"), nil, logical.ErrInvalidRequest
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}
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// Determine the source of the login
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source := c.router.MatchingMount(req.Path)
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source = strings.TrimPrefix(source, credentialRoutePrefix)
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source = strings.Replace(source, "/", "-", -1)
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// Prepend the source to the display name
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auth.DisplayName = strings.TrimSuffix(source+auth.DisplayName, "-")
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sysView := c.router.MatchingSystemView(req.Path)
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if sysView == nil {
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c.logger.Error("core: unable to look up sys view for login path", "request_path", req.Path)
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return nil, nil, ErrInternalError
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}
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// Set the default lease if not provided
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if auth.TTL == 0 {
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auth.TTL = sysView.DefaultLeaseTTL()
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}
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// Limit the lease duration
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if auth.TTL > sysView.MaxLeaseTTL() {
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auth.TTL = sysView.MaxLeaseTTL()
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}
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// Generate a token
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te := TokenEntry{
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Path: req.Path,
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Policies: auth.Policies,
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Meta: auth.Metadata,
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DisplayName: auth.DisplayName,
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CreationTime: time.Now().Unix(),
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TTL: auth.TTL,
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NumUses: auth.NumUses,
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}
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te.Policies = policyutil.SanitizePolicies(te.Policies, true)
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// Prevent internal policies from being assigned to tokens
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for _, policy := range te.Policies {
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if strutil.StrListContains(nonAssignablePolicies, policy) {
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return logical.ErrorResponse(fmt.Sprintf("cannot assign policy %q", policy)), nil, logical.ErrInvalidRequest
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}
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}
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if err := c.tokenStore.create(&te); err != nil {
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c.logger.Error("core: failed to create token", "error", err)
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return nil, auth, ErrInternalError
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}
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// Populate the client token and accessor
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auth.ClientToken = te.ID
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auth.Accessor = te.Accessor
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auth.Policies = te.Policies
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// Register with the expiration manager
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if err := c.expiration.RegisterAuth(te.Path, auth); err != nil {
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c.tokenStore.Revoke(te.ID)
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c.logger.Error("core: failed to register token lease", "request_path", req.Path, "error", err)
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return nil, auth, ErrInternalError
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}
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// Attach the display name, might be used by audit backends
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req.DisplayName = auth.DisplayName
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}
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return resp, auth, routeErr
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}
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