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api.go
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api.go
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/*
Copyright 2015 Gravitational, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package events
import (
"context"
"fmt"
"io"
"time"
"github.com/gravitational/teleport/lib/session"
)
const (
// EventType is event type/kind
EventType = "event"
// EventID is a unique event identifier
EventID = "uid"
// EventTime is event time
EventTime = "time"
// EventLogin is OS login
EventLogin = "login"
// EventUser is teleport user name
EventUser = "user"
// EventProtocol specifies protocol that was captured
EventProtocol = "proto"
// EventProtocolsSSH specifies SSH as a type of captured protocol
EventProtocolSSH = "ssh"
// EventProtocolKube specifies kubernetes as a type of captured protocol
EventProtocolKube = "kube"
// LocalAddr is a target address on the host
LocalAddr = "addr.local"
// RemoteAddr is a client (user's) address
RemoteAddr = "addr.remote"
// EventCursor is an event ID (used as cursor value for enumeration, not stored)
EventCursor = "id"
// EventIndex is an event index as received from the logging server
EventIndex = "ei"
// EventNamespace is a namespace of the session event
EventNamespace = "namespace"
// SessionPrintEvent event happens every time a write occurs to
// temirnal I/O during a session
SessionPrintEvent = "print"
// SessionPrintEventBytes says how many bytes have been written into the session
// during "print" event
SessionPrintEventBytes = "bytes"
// SessionEventTimestamp is an offset (in milliseconds) since the beginning of the
// session when the terminal IO event happened
SessionEventTimestamp = "ms"
// SessionEvent indicates that session has been initiated
// or updated by a joining party on the server
SessionStartEvent = "session.start"
// SessionEndEvent indicates that a session has ended
SessionEndEvent = "session.end"
// SessionUploadEvent indicates that session has been uploaded to the external storage
SessionUploadEvent = "session.upload"
// URL is used for a session upload URL
URL = "url"
SessionEventID = "sid"
SessionServerID = "server_id"
// SessionByteOffset is the number of bytes written to session stream since
// the beginning
SessionByteOffset = "offset"
// SessionJoinEvent indicates that someone joined a session
SessionJoinEvent = "session.join"
// SessionLeaveEvent indicates that someone left a session
SessionLeaveEvent = "session.leave"
// ClientDisconnectEvent is emitted when client is disconnected
// by the server due to inactivity or any other reason
ClientDisconnectEvent = "client.disconnect"
// Reason is a field that specifies reason for event, e.g. in disconnect
// event it explains why server disconnected the client
Reason = "reason"
// UserLoginEvent indicates that a user logged into web UI or via tsh
UserLoginEvent = "user.login"
// LoginMethod is the event field indicating how the login was performed
LoginMethod = "method"
// LoginMethodLocal represents login with username/password
LoginMethodLocal = "local"
// LoginMethodOIDC represents login with OIDC
LoginMethodOIDC = "oidc"
// LoginMethodSAML represents login with SAML
LoginMethodSAML = "saml"
// LoginMethodGithub represents login with Github
LoginMethodGithub = "github"
// ExecEvent is an exec command executed by script or user on
// the server side
ExecEvent = "exec"
ExecEventCommand = "command"
ExecEventCode = "exitCode"
ExecEventError = "exitError"
// SubsystemEvent is the result of the execution of a subsystem.
SubsystemEvent = "subsystem"
SubsystemName = "name"
SubsystemError = "exitError"
// Port forwarding event
PortForwardEvent = "port"
PortForwardAddr = "addr"
PortForwardSuccess = "success"
PortForwardErr = "error"
// AuthAttemptEvent is authentication attempt that either
// succeeded or failed based on event status
AuthAttemptEvent = "auth"
AuthAttemptSuccess = "success"
AuthAttemptErr = "error"
AuthAttemptMessage = "message"
// SCPEvent means data transfer that occurred on the server
SCPEvent = "scp"
SCPPath = "path"
SCPLengh = "len"
SCPAction = "action"
SCPUpload = "upload"
SCPDownload = "download"
// ResizeEvent means that some user resized PTY on the client
ResizeEvent = "resize"
TerminalSize = "size" // expressed as 'W:H'
)
const (
// MaxChunkBytes defines the maximum size of a session stream chunk that
// can be requested via AuditLog.GetSessionChunk(). Set to 5MB
MaxChunkBytes = 1024 * 1024 * 5
)
const (
// V1 is the V1 version of slice chunks API,
// it is 0 because it was not defined before
V1 = 0
// V2 is the V2 version of slice chunks API
V2 = 2
// V3 is almost like V2, but it assumes
// that session recordings are being uploaded
// at the end of the session, so it skips writing session event index
// on the fly
V3 = 3
)
// IAuditLog is the primary (and the only external-facing) interface for AuditLogger.
// If you wish to implement a different kind of logger (not filesystem-based), you
// have to implement this interface
type IAuditLog interface {
// Closer releases connection and resources associated with log if any
io.Closer
// EmitAuditEvent emits audit event
EmitAuditEvent(eventType string, fields EventFields) error
// DELETE IN: 2.7.0
// This method is no longer necessary as nodes and proxies >= 2.7.0
// use UploadSessionRecording method.
// PostSessionSlice sends chunks of recorded session to the event log
PostSessionSlice(SessionSlice) error
// UploadSessionRecording uploads session recording to the audit server
UploadSessionRecording(r SessionRecording) error
// GetSessionChunk returns a reader which can be used to read a byte stream
// of a recorded session starting from 'offsetBytes' (pass 0 to start from the
// beginning) up to maxBytes bytes.
//
// If maxBytes > MaxChunkBytes, it gets rounded down to MaxChunkBytes
GetSessionChunk(namespace string, sid session.ID, offsetBytes, maxBytes int) ([]byte, error)
// Returns all events that happen during a session sorted by time
// (oldest first).
//
// after tells to use only return events after a specified cursor Id
//
// This function is usually used in conjunction with GetSessionReader to
// replay recorded session streams.
GetSessionEvents(namespace string, sid session.ID, after int, includePrintEvents bool) ([]EventFields, error)
// SearchEvents is a flexible way to find events. The format of a query string
// depends on the implementing backend. A recommended format is urlencoded
// (good enough for Lucene/Solr)
//
// Pagination is also defined via backend-specific query format.
//
// The only mandatory requirement is a date range (UTC). Results must always
// show up sorted by date (newest first)
SearchEvents(fromUTC, toUTC time.Time, query string, limit int) ([]EventFields, error)
// SearchSessionEvents returns session related events only. This is used to
// find completed session.
SearchSessionEvents(fromUTC time.Time, toUTC time.Time, limit int) ([]EventFields, error)
// WaitForDelivery waits for resources to be released and outstanding requests to
// complete after calling Close method
WaitForDelivery(context.Context) error
}
// EventFields instance is attached to every logged event
type EventFields map[string]interface{}
// String returns a string representation of an event structure
func (f EventFields) AsString() string {
return fmt.Sprintf("%s: login=%s, id=%v, bytes=%v",
f.GetString(EventType),
f.GetString(EventLogin),
f.GetInt(EventCursor),
f.GetInt(SessionPrintEventBytes))
}
// GetType returns the type (string) of the event
func (f EventFields) GetType() string {
return f.GetString(EventType)
}
// GetID returns the unique event ID
func (f EventFields) GetID() string {
return f.GetString(EventID)
}
// GetString returns a string representation of a logged field
func (f EventFields) GetString(key string) string {
val, found := f[key]
if !found {
return ""
}
v, _ := val.(string)
return v
}
// GetString returns an int representation of a logged field
func (f EventFields) GetInt(key string) int {
val, found := f[key]
if !found {
return 0
}
v, ok := val.(int)
if !ok {
f, ok := val.(float64)
if ok {
v = int(f)
}
}
return v
}
// GetString returns an int representation of a logged field
func (f EventFields) GetTime(key string) time.Time {
val, found := f[key]
if !found {
return time.Time{}
}
v, ok := val.(time.Time)
if !ok {
s := f.GetString(key)
v, _ = time.Parse(time.RFC3339, s)
}
return v
}