509 lines
18 KiB
Go
509 lines
18 KiB
Go
package agent
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import (
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"encoding/json"
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"fmt"
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"net"
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"net/http"
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"net/http/pprof"
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"net/url"
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"regexp"
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"strconv"
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"strings"
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"time"
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"github.com/armon/go-metrics"
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"github.com/hashicorp/consul/acl"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/mitchellh/mapstructure"
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)
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// MethodNotAllowedError should be returned by a handler when the HTTP method is not allowed.
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type MethodNotAllowedError struct {
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Method string
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Allow []string
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}
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func (e MethodNotAllowedError) Error() string {
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return fmt.Sprintf("method %s not allowed", e.Method)
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}
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// HTTPServer provides an HTTP api for an agent.
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type HTTPServer struct {
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*http.Server
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agent *Agent
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blacklist *Blacklist
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// proto is filled by the agent to "http" or "https".
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proto string
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addr net.Addr
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}
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func NewHTTPServer(addr net.Addr, a *Agent) *HTTPServer {
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s := &HTTPServer{
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Server: &http.Server{Addr: addr.String()},
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agent: a,
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blacklist: NewBlacklist(a.config.HTTPBlockEndpoints),
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addr: addr,
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}
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s.Server.Handler = s.handler(a.config.EnableDebug)
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return s
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}
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// handler is used to attach our handlers to the mux
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func (s *HTTPServer) handler(enableDebug bool) http.Handler {
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mux := http.NewServeMux()
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// handleFuncMetrics takes the given pattern and handler and wraps to produce
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// metrics based on the pattern and request.
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handleFuncMetrics := func(pattern string, handler http.HandlerFunc) {
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// Get the parts of the pattern. We omit any initial empty for the
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// leading slash, and put an underscore as a "thing" placeholder if we
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// see a trailing slash, which means the part after is parsed. This lets
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// us distinguish from things like /v1/query and /v1/query/<query id>.
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var parts []string
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for i, part := range strings.Split(pattern, "/") {
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if part == "" {
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if i == 0 {
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continue
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}
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part = "_"
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}
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parts = append(parts, part)
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}
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// Register the wrapper, which will close over the expensive-to-compute
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// parts from above.
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// TODO (kyhavlov): Convert this to utilize metric labels in a major release
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wrapper := func(resp http.ResponseWriter, req *http.Request) {
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start := time.Now()
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handler(resp, req)
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key := append([]string{"consul", "http", req.Method}, parts...)
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metrics.MeasureSince(key, start)
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}
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mux.HandleFunc(pattern, wrapper)
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}
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mux.HandleFunc("/", s.Index)
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// API V1.
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if s.agent.config.ACLDatacenter != "" {
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handleFuncMetrics("/v1/acl/bootstrap", s.wrap(s.ACLBootstrap))
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handleFuncMetrics("/v1/acl/create", s.wrap(s.ACLCreate))
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handleFuncMetrics("/v1/acl/update", s.wrap(s.ACLUpdate))
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handleFuncMetrics("/v1/acl/destroy/", s.wrap(s.ACLDestroy))
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handleFuncMetrics("/v1/acl/info/", s.wrap(s.ACLGet))
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handleFuncMetrics("/v1/acl/clone/", s.wrap(s.ACLClone))
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handleFuncMetrics("/v1/acl/list", s.wrap(s.ACLList))
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handleFuncMetrics("/v1/acl/replication", s.wrap(s.ACLReplicationStatus))
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handleFuncMetrics("/v1/agent/token/", s.wrap(s.AgentToken))
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} else {
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handleFuncMetrics("/v1/acl/bootstrap", s.wrap(ACLDisabled))
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handleFuncMetrics("/v1/acl/create", s.wrap(ACLDisabled))
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handleFuncMetrics("/v1/acl/update", s.wrap(ACLDisabled))
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handleFuncMetrics("/v1/acl/destroy/", s.wrap(ACLDisabled))
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handleFuncMetrics("/v1/acl/info/", s.wrap(ACLDisabled))
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handleFuncMetrics("/v1/acl/clone/", s.wrap(ACLDisabled))
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handleFuncMetrics("/v1/acl/list", s.wrap(ACLDisabled))
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handleFuncMetrics("/v1/acl/replication", s.wrap(ACLDisabled))
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handleFuncMetrics("/v1/agent/token/", s.wrap(ACLDisabled))
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}
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handleFuncMetrics("/v1/agent/self", s.wrap(s.AgentSelf))
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handleFuncMetrics("/v1/agent/maintenance", s.wrap(s.AgentNodeMaintenance))
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handleFuncMetrics("/v1/agent/reload", s.wrap(s.AgentReload))
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handleFuncMetrics("/v1/agent/monitor", s.wrap(s.AgentMonitor))
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handleFuncMetrics("/v1/agent/metrics", s.wrap(s.AgentMetrics))
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handleFuncMetrics("/v1/agent/services", s.wrap(s.AgentServices))
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handleFuncMetrics("/v1/agent/checks", s.wrap(s.AgentChecks))
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handleFuncMetrics("/v1/agent/members", s.wrap(s.AgentMembers))
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handleFuncMetrics("/v1/agent/join/", s.wrap(s.AgentJoin))
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handleFuncMetrics("/v1/agent/leave", s.wrap(s.AgentLeave))
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handleFuncMetrics("/v1/agent/force-leave/", s.wrap(s.AgentForceLeave))
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handleFuncMetrics("/v1/agent/check/register", s.wrap(s.AgentRegisterCheck))
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handleFuncMetrics("/v1/agent/check/deregister/", s.wrap(s.AgentDeregisterCheck))
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handleFuncMetrics("/v1/agent/check/pass/", s.wrap(s.AgentCheckPass))
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handleFuncMetrics("/v1/agent/check/warn/", s.wrap(s.AgentCheckWarn))
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handleFuncMetrics("/v1/agent/check/fail/", s.wrap(s.AgentCheckFail))
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handleFuncMetrics("/v1/agent/check/update/", s.wrap(s.AgentCheckUpdate))
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handleFuncMetrics("/v1/agent/service/register", s.wrap(s.AgentRegisterService))
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handleFuncMetrics("/v1/agent/service/deregister/", s.wrap(s.AgentDeregisterService))
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handleFuncMetrics("/v1/agent/service/maintenance/", s.wrap(s.AgentServiceMaintenance))
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handleFuncMetrics("/v1/catalog/register", s.wrap(s.CatalogRegister))
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handleFuncMetrics("/v1/catalog/deregister", s.wrap(s.CatalogDeregister))
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handleFuncMetrics("/v1/catalog/datacenters", s.wrap(s.CatalogDatacenters))
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handleFuncMetrics("/v1/catalog/nodes", s.wrap(s.CatalogNodes))
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handleFuncMetrics("/v1/catalog/services", s.wrap(s.CatalogServices))
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handleFuncMetrics("/v1/catalog/service/", s.wrap(s.CatalogServiceNodes))
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handleFuncMetrics("/v1/catalog/node/", s.wrap(s.CatalogNodeServices))
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if !s.agent.config.DisableCoordinates {
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handleFuncMetrics("/v1/coordinate/datacenters", s.wrap(s.CoordinateDatacenters))
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handleFuncMetrics("/v1/coordinate/nodes", s.wrap(s.CoordinateNodes))
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} else {
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handleFuncMetrics("/v1/coordinate/datacenters", s.wrap(coordinateDisabled))
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handleFuncMetrics("/v1/coordinate/nodes", s.wrap(coordinateDisabled))
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}
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handleFuncMetrics("/v1/event/fire/", s.wrap(s.EventFire))
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handleFuncMetrics("/v1/event/list", s.wrap(s.EventList))
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handleFuncMetrics("/v1/health/node/", s.wrap(s.HealthNodeChecks))
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handleFuncMetrics("/v1/health/checks/", s.wrap(s.HealthServiceChecks))
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handleFuncMetrics("/v1/health/state/", s.wrap(s.HealthChecksInState))
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handleFuncMetrics("/v1/health/service/", s.wrap(s.HealthServiceNodes))
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handleFuncMetrics("/v1/internal/ui/nodes", s.wrap(s.UINodes))
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handleFuncMetrics("/v1/internal/ui/node/", s.wrap(s.UINodeInfo))
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handleFuncMetrics("/v1/internal/ui/services", s.wrap(s.UIServices))
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handleFuncMetrics("/v1/kv/", s.wrap(s.KVSEndpoint))
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handleFuncMetrics("/v1/operator/raft/configuration", s.wrap(s.OperatorRaftConfiguration))
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handleFuncMetrics("/v1/operator/raft/peer", s.wrap(s.OperatorRaftPeer))
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handleFuncMetrics("/v1/operator/keyring", s.wrap(s.OperatorKeyringEndpoint))
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handleFuncMetrics("/v1/operator/autopilot/configuration", s.wrap(s.OperatorAutopilotConfiguration))
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handleFuncMetrics("/v1/operator/autopilot/health", s.wrap(s.OperatorServerHealth))
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handleFuncMetrics("/v1/query", s.wrap(s.PreparedQueryGeneral))
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handleFuncMetrics("/v1/query/", s.wrap(s.PreparedQuerySpecific))
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handleFuncMetrics("/v1/session/create", s.wrap(s.SessionCreate))
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handleFuncMetrics("/v1/session/destroy/", s.wrap(s.SessionDestroy))
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handleFuncMetrics("/v1/session/renew/", s.wrap(s.SessionRenew))
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handleFuncMetrics("/v1/session/info/", s.wrap(s.SessionGet))
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handleFuncMetrics("/v1/session/node/", s.wrap(s.SessionsForNode))
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handleFuncMetrics("/v1/session/list", s.wrap(s.SessionList))
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handleFuncMetrics("/v1/status/leader", s.wrap(s.StatusLeader))
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handleFuncMetrics("/v1/status/peers", s.wrap(s.StatusPeers))
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handleFuncMetrics("/v1/snapshot", s.wrap(s.Snapshot))
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handleFuncMetrics("/v1/txn", s.wrap(s.Txn))
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// Debug endpoints.
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if enableDebug {
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handleFuncMetrics("/debug/pprof/", pprof.Index)
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handleFuncMetrics("/debug/pprof/cmdline", pprof.Cmdline)
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handleFuncMetrics("/debug/pprof/profile", pprof.Profile)
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handleFuncMetrics("/debug/pprof/symbol", pprof.Symbol)
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}
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// Use the custom UI dir if provided.
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if s.agent.config.UIDir != "" {
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mux.Handle("/ui/", http.StripPrefix("/ui/", http.FileServer(http.Dir(s.agent.config.UIDir))))
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} else if s.agent.config.EnableUI {
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mux.Handle("/ui/", http.StripPrefix("/ui/", http.FileServer(assetFS())))
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}
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return mux
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}
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// aclEndpointRE is used to find old ACL endpoints that take tokens in the URL
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// so that we can redact them. The ACL endpoints that take the token in the URL
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// are all of the form /v1/acl/<verb>/<token>, and can optionally include query
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// parameters which are indicated by a question mark. We capture the part before
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// the token, the token, and any query parameters after, and then reassemble as
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// $1<hidden>$3 (the token in $2 isn't used), which will give:
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//
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// /v1/acl/clone/foo -> /v1/acl/clone/<hidden>
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// /v1/acl/clone/foo?token=bar -> /v1/acl/clone/<hidden>?token=<hidden>
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//
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// The query parameter in the example above is obfuscated like any other, after
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// this regular expression is applied, so the regular expression substitution
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// results in:
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//
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// /v1/acl/clone/foo?token=bar -> /v1/acl/clone/<hidden>?token=bar
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// ^---- $1 ----^^- $2 -^^-- $3 --^
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//
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// And then the loop that looks for parameters called "token" does the last
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// step to get to the final redacted form.
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var (
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aclEndpointRE = regexp.MustCompile("^(/v1/acl/[^/]+/)([^?]+)([?]?.*)$")
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)
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// wrap is used to wrap functions to make them more convenient
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func (s *HTTPServer) wrap(handler func(resp http.ResponseWriter, req *http.Request) (interface{}, error)) http.HandlerFunc {
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return func(resp http.ResponseWriter, req *http.Request) {
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setHeaders(resp, s.agent.config.HTTPResponseHeaders)
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setTranslateAddr(resp, s.agent.config.TranslateWANAddrs)
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// Obfuscate any tokens from appearing in the logs
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formVals, err := url.ParseQuery(req.URL.RawQuery)
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if err != nil {
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s.agent.logger.Printf("[ERR] http: Failed to decode query: %s from=%s", err, req.RemoteAddr)
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resp.WriteHeader(http.StatusInternalServerError)
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return
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}
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logURL := req.URL.String()
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if tokens, ok := formVals["token"]; ok {
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for _, token := range tokens {
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if token == "" {
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logURL += "<hidden>"
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continue
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}
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logURL = strings.Replace(logURL, token, "<hidden>", -1)
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}
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}
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logURL = aclEndpointRE.ReplaceAllString(logURL, "$1<hidden>$3")
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if s.blacklist.Block(req.URL.Path) {
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errMsg := "Endpoint is blocked by agent configuration"
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s.agent.logger.Printf("[ERR] http: Request %s %v, error: %v from=%s", req.Method, logURL, err, req.RemoteAddr)
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resp.WriteHeader(http.StatusForbidden)
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fmt.Fprint(resp, errMsg)
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return
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}
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isMethodNotAllowed := func(err error) bool {
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_, ok := err.(MethodNotAllowedError)
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return ok
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}
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handleErr := func(err error) {
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s.agent.logger.Printf("[ERR] http: Request %s %v, error: %v from=%s", req.Method, logURL, err, req.RemoteAddr)
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switch {
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case acl.IsErrPermissionDenied(err) || acl.IsErrNotFound(err):
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resp.WriteHeader(http.StatusForbidden)
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fmt.Fprint(resp, err.Error())
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case structs.IsErrRPCRateExceeded(err):
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resp.WriteHeader(http.StatusTooManyRequests)
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case isMethodNotAllowed(err):
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// RFC2616 states that for 405 Method Not Allowed the response
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// MUST include an Allow header containing the list of valid
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// methods for the requested resource.
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// https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
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resp.Header()["Allow"] = err.(MethodNotAllowedError).Allow
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resp.WriteHeader(http.StatusMethodNotAllowed) // 405
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fmt.Fprint(resp, err.Error())
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default:
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resp.WriteHeader(http.StatusInternalServerError)
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fmt.Fprint(resp, err.Error())
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}
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}
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// Invoke the handler
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start := time.Now()
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defer func() {
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s.agent.logger.Printf("[DEBUG] http: Request %s %v (%v) from=%s", req.Method, logURL, time.Since(start), req.RemoteAddr)
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}()
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obj, err := handler(resp, req)
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if err != nil {
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handleErr(err)
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return
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}
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if obj == nil {
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return
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}
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buf, err := s.marshalJSON(req, obj)
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if err != nil {
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handleErr(err)
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return
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}
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resp.Header().Set("Content-Type", "application/json")
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resp.Write(buf)
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}
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}
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// marshalJSON marshals the object into JSON, respecting the user's pretty-ness
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// configuration.
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func (s *HTTPServer) marshalJSON(req *http.Request, obj interface{}) ([]byte, error) {
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if _, ok := req.URL.Query()["pretty"]; ok || s.agent.config.DevMode {
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buf, err := json.MarshalIndent(obj, "", " ")
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if err != nil {
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return nil, err
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}
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buf = append(buf, "\n"...)
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return buf, nil
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}
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buf, err := json.Marshal(obj)
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if err != nil {
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return nil, err
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}
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return buf, err
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}
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// Returns true if the UI is enabled.
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func (s *HTTPServer) IsUIEnabled() bool {
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return s.agent.config.UIDir != "" || s.agent.config.EnableUI
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}
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// Renders a simple index page
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func (s *HTTPServer) Index(resp http.ResponseWriter, req *http.Request) {
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// Check if this is a non-index path
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if req.URL.Path != "/" {
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resp.WriteHeader(http.StatusNotFound)
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return
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}
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// Give them something helpful if there's no UI so they at least know
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// what this server is.
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if !s.IsUIEnabled() {
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fmt.Fprint(resp, "Consul Agent")
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return
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}
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// Redirect to the UI endpoint
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http.Redirect(resp, req, "/ui/", http.StatusMovedPermanently) // 301
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}
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// decodeBody is used to decode a JSON request body
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func decodeBody(req *http.Request, out interface{}, cb func(interface{}) error) error {
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var raw interface{}
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dec := json.NewDecoder(req.Body)
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if err := dec.Decode(&raw); err != nil {
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return err
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}
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// Invoke the callback prior to decode
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if cb != nil {
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if err := cb(raw); err != nil {
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return err
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}
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}
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return mapstructure.Decode(raw, out)
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}
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// setTranslateAddr is used to set the address translation header. This is only
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// present if the feature is active.
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func setTranslateAddr(resp http.ResponseWriter, active bool) {
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if active {
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resp.Header().Set("X-Consul-Translate-Addresses", "true")
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}
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}
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// setIndex is used to set the index response header
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func setIndex(resp http.ResponseWriter, index uint64) {
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resp.Header().Set("X-Consul-Index", strconv.FormatUint(index, 10))
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}
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// setKnownLeader is used to set the known leader header
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func setKnownLeader(resp http.ResponseWriter, known bool) {
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s := "true"
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if !known {
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s = "false"
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}
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resp.Header().Set("X-Consul-KnownLeader", s)
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}
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// setLastContact is used to set the last contact header
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func setLastContact(resp http.ResponseWriter, last time.Duration) {
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if last < 0 {
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last = 0
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}
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lastMsec := uint64(last / time.Millisecond)
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resp.Header().Set("X-Consul-LastContact", strconv.FormatUint(lastMsec, 10))
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}
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// setMeta is used to set the query response meta data
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func setMeta(resp http.ResponseWriter, m *structs.QueryMeta) {
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setIndex(resp, m.Index)
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setLastContact(resp, m.LastContact)
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setKnownLeader(resp, m.KnownLeader)
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}
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// setHeaders is used to set canonical response header fields
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func setHeaders(resp http.ResponseWriter, headers map[string]string) {
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for field, value := range headers {
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resp.Header().Set(http.CanonicalHeaderKey(field), value)
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}
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}
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// parseWait is used to parse the ?wait and ?index query params
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// Returns true on error
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func parseWait(resp http.ResponseWriter, req *http.Request, b *structs.QueryOptions) bool {
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query := req.URL.Query()
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if wait := query.Get("wait"); wait != "" {
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dur, err := time.ParseDuration(wait)
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if err != nil {
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resp.WriteHeader(http.StatusBadRequest)
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fmt.Fprint(resp, "Invalid wait time")
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return true
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}
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b.MaxQueryTime = dur
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}
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if idx := query.Get("index"); idx != "" {
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index, err := strconv.ParseUint(idx, 10, 64)
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if err != nil {
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resp.WriteHeader(http.StatusBadRequest)
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fmt.Fprint(resp, "Invalid index")
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return true
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}
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b.MinQueryIndex = index
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}
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return false
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}
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// parseConsistency is used to parse the ?stale and ?consistent query params.
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// Returns true on error
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func parseConsistency(resp http.ResponseWriter, req *http.Request, b *structs.QueryOptions) bool {
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query := req.URL.Query()
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if _, ok := query["stale"]; ok {
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b.AllowStale = true
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}
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if _, ok := query["consistent"]; ok {
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b.RequireConsistent = true
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}
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if b.AllowStale && b.RequireConsistent {
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resp.WriteHeader(http.StatusBadRequest)
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fmt.Fprint(resp, "Cannot specify ?stale with ?consistent, conflicting semantics.")
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return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// parseDC is used to parse the ?dc query param
|
|
func (s *HTTPServer) parseDC(req *http.Request, dc *string) {
|
|
if other := req.URL.Query().Get("dc"); other != "" {
|
|
*dc = other
|
|
} else if *dc == "" {
|
|
*dc = s.agent.config.Datacenter
|
|
}
|
|
}
|
|
|
|
// parseToken is used to parse the ?token query param or the X-Consul-Token header
|
|
func (s *HTTPServer) parseToken(req *http.Request, token *string) {
|
|
if other := req.URL.Query().Get("token"); other != "" {
|
|
*token = other
|
|
return
|
|
}
|
|
|
|
if other := req.Header.Get("X-Consul-Token"); other != "" {
|
|
*token = other
|
|
return
|
|
}
|
|
|
|
// Set the default ACLToken
|
|
*token = s.agent.tokens.UserToken()
|
|
}
|
|
|
|
// parseSource is used to parse the ?near=<node> query parameter, used for
|
|
// sorting by RTT based on a source node. We set the source's DC to the target
|
|
// DC in the request, if given, or else the agent's DC.
|
|
func (s *HTTPServer) parseSource(req *http.Request, source *structs.QuerySource) {
|
|
s.parseDC(req, &source.Datacenter)
|
|
if node := req.URL.Query().Get("near"); node != "" {
|
|
if node == "_agent" {
|
|
source.Node = s.agent.config.NodeName
|
|
} else {
|
|
source.Node = node
|
|
}
|
|
}
|
|
}
|
|
|
|
// parseMetaFilter is used to parse the ?node-meta=key:value query parameter, used for
|
|
// filtering results to nodes with the given metadata key/value
|
|
func (s *HTTPServer) parseMetaFilter(req *http.Request) map[string]string {
|
|
if filterList, ok := req.URL.Query()["node-meta"]; ok {
|
|
filters := make(map[string]string)
|
|
for _, filter := range filterList {
|
|
key, value := ParseMetaPair(filter)
|
|
filters[key] = value
|
|
}
|
|
return filters
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// parse is a convenience method for endpoints that need
|
|
// to use both parseWait and parseDC.
|
|
func (s *HTTPServer) parse(resp http.ResponseWriter, req *http.Request, dc *string, b *structs.QueryOptions) bool {
|
|
s.parseDC(req, dc)
|
|
s.parseToken(req, &b.Token)
|
|
if parseConsistency(resp, req, b) {
|
|
return true
|
|
}
|
|
return parseWait(resp, req, b)
|
|
}
|