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dendrite/common/config/appservice.go
mohit kumar singh 2c43e222bd
support non-exclusive namespaces for AS (#828)
Signed-off-by: MohitKS5 <mohitkumarsingh907@gmail.com>

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>
Co-authored-by: Kegsay <kegan@matrix.org>
2020-04-14 15:31:27 +01:00

329 lines
11 KiB
Go

// Copyright 2017 Andrew Morgan <andrew@amorgan.xyz>
//
// 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 config
import (
"fmt"
"io/ioutil"
"path/filepath"
"regexp"
"strings"
log "github.com/sirupsen/logrus"
yaml "gopkg.in/yaml.v2"
)
// ApplicationServiceNamespace is the namespace that a specific application
// service has management over.
type ApplicationServiceNamespace struct {
// Whether or not the namespace is managed solely by this application service
Exclusive bool `yaml:"exclusive"`
// A regex pattern that represents the namespace
Regex string `yaml:"regex"`
// The ID of an existing group that all users of this application service will
// be added to. This field is only relevant to the `users` namespace.
// Note that users who are joined to this group through an application service
// are not to be listed when querying for the group's members, however the
// group should be listed when querying an application service user's groups.
// This is to prevent making spamming all users of an application service
// trivial.
GroupID string `yaml:"group_id"`
// Regex object representing our pattern. Saves having to recompile every time
RegexpObject *regexp.Regexp
}
// ApplicationService represents a Matrix application service.
// https://matrix.org/docs/spec/application_service/unstable.html
type ApplicationService struct {
// User-defined, unique, persistent ID of the application service
ID string `yaml:"id"`
// Base URL of the application service
URL string `yaml:"url"`
// Application service token provided in requests to a homeserver
ASToken string `yaml:"as_token"`
// Homeserver token provided in requests to an application service
HSToken string `yaml:"hs_token"`
// Localpart of application service user
SenderLocalpart string `yaml:"sender_localpart"`
// Information about an application service's namespaces. Key is either
// "users", "aliases" or "rooms"
NamespaceMap map[string][]ApplicationServiceNamespace `yaml:"namespaces"`
// Whether rate limiting is applied to each application service user
RateLimited bool `yaml:"rate_limited"`
// Any custom protocols that this application service provides (e.g. IRC)
Protocols []string `yaml:"protocols"`
}
// IsInterestedInRoomID returns a bool on whether an application service's
// namespace includes the given room ID
func (a *ApplicationService) IsInterestedInRoomID(
roomID string,
) bool {
if namespaceSlice, ok := a.NamespaceMap["rooms"]; ok {
for _, namespace := range namespaceSlice {
if namespace.RegexpObject.MatchString(roomID) {
return true
}
}
}
return false
}
// IsInterestedInUserID returns a bool on whether an application service's
// namespace includes the given user ID
func (a *ApplicationService) IsInterestedInUserID(
userID string,
) bool {
if namespaceSlice, ok := a.NamespaceMap["users"]; ok {
for _, namespace := range namespaceSlice {
if namespace.RegexpObject.MatchString(userID) {
return true
}
}
}
return false
}
// OwnsNamespaceCoveringUserId returns a bool on whether an application service's
// namespace is exclusive and includes the given user ID
func (a *ApplicationService) OwnsNamespaceCoveringUserId(
userID string,
) bool {
if namespaceSlice, ok := a.NamespaceMap["users"]; ok {
for _, namespace := range namespaceSlice {
if namespace.Exclusive && namespace.RegexpObject.MatchString(userID) {
return true
}
}
}
return false
}
// IsInterestedInRoomAlias returns a bool on whether an application service's
// namespace includes the given room alias
func (a *ApplicationService) IsInterestedInRoomAlias(
roomAlias string,
) bool {
if namespaceSlice, ok := a.NamespaceMap["aliases"]; ok {
for _, namespace := range namespaceSlice {
if namespace.RegexpObject.MatchString(roomAlias) {
return true
}
}
}
return false
}
// loadAppServices iterates through all application service config files
// and loads their data into the config object for later access.
func loadAppServices(config *Dendrite) error {
for _, configPath := range config.ApplicationServices.ConfigFiles {
// Create a new application service with default options
appservice := ApplicationService{
RateLimited: true,
}
// Create an absolute path from a potentially relative path
absPath, err := filepath.Abs(configPath)
if err != nil {
return err
}
// Read the application service's config file
configData, err := ioutil.ReadFile(absPath)
if err != nil {
return err
}
// Load the config data into our struct
if err = yaml.UnmarshalStrict(configData, &appservice); err != nil {
return err
}
// Append the parsed application service to the global config
config.Derived.ApplicationServices = append(
config.Derived.ApplicationServices, appservice,
)
}
// Check for any errors in the loaded application services
return checkErrors(config)
}
// setupRegexps will create regex objects for exclusive and non-exclusive
// usernames, aliases and rooms of all application services, so that other
// methods can quickly check if a particular string matches any of them.
func setupRegexps(cfg *Dendrite) (err error) {
// Combine all exclusive namespaces for later string checking
var exclusiveUsernameStrings, exclusiveAliasStrings []string
// If an application service's regex is marked as exclusive, add
// its contents to the overall exlusive regex string. Room regex
// not necessary as we aren't denying exclusive room ID creation
for _, appservice := range cfg.Derived.ApplicationServices {
for key, namespaceSlice := range appservice.NamespaceMap {
switch key {
case "users":
appendExclusiveNamespaceRegexs(&exclusiveUsernameStrings, namespaceSlice)
case "aliases":
appendExclusiveNamespaceRegexs(&exclusiveAliasStrings, namespaceSlice)
}
}
}
// Join the regexes together into one big regex.
// i.e. "app1.*", "app2.*" -> "(app1.*)|(app2.*)"
// Later we can check if a username or alias matches any exclusive regex and
// deny access if it isn't from an application service
exclusiveUsernames := strings.Join(exclusiveUsernameStrings, "|")
exclusiveAliases := strings.Join(exclusiveAliasStrings, "|")
// If there are no exclusive regexes, compile string so that it will not match
// any valid usernames/aliases/roomIDs
if exclusiveUsernames == "" {
exclusiveUsernames = "^$"
}
if exclusiveAliases == "" {
exclusiveAliases = "^$"
}
// Store compiled Regex
if cfg.Derived.ExclusiveApplicationServicesUsernameRegexp, err = regexp.Compile(exclusiveUsernames); err != nil {
return err
}
if cfg.Derived.ExclusiveApplicationServicesAliasRegexp, err = regexp.Compile(exclusiveAliases); err != nil {
return err
}
return nil
}
// appendExclusiveNamespaceRegexs takes a slice of strings and a slice of
// namespaces and will append the regexes of only the exclusive namespaces
// into the string slice
func appendExclusiveNamespaceRegexs(
exclusiveStrings *[]string, namespaces []ApplicationServiceNamespace,
) {
for index, namespace := range namespaces {
if namespace.Exclusive {
// We append parenthesis to later separate each regex when we compile
// i.e. "app1.*", "app2.*" -> "(app1.*)|(app2.*)"
*exclusiveStrings = append(*exclusiveStrings, "("+namespace.Regex+")")
}
// Compile this regex into a Regexp object for later use
namespaces[index].RegexpObject, _ = regexp.Compile(namespace.Regex)
}
}
// checkErrors checks for any configuration errors amongst the loaded
// application services according to the application service spec.
func checkErrors(config *Dendrite) (err error) {
var idMap = make(map[string]bool)
var tokenMap = make(map[string]bool)
// Compile regexp object for checking groupIDs
groupIDRegexp := regexp.MustCompile(`\+.*:.*`)
// Check each application service for any config errors
for _, appservice := range config.Derived.ApplicationServices {
// Namespace-related checks
for key, namespaceSlice := range appservice.NamespaceMap {
for _, namespace := range namespaceSlice {
if err := validateNamespace(&appservice, key, &namespace, groupIDRegexp); err != nil {
return err
}
}
}
// Check if the url has trailing /'s. If so, remove them
appservice.URL = strings.TrimRight(appservice.URL, "/")
// Check if we've already seen this ID. No two application services
// can have the same ID or token.
if idMap[appservice.ID] {
return configErrors([]string{fmt.Sprintf(
"Application service ID %s must be unique", appservice.ID,
)})
}
// Check if we've already seen this token
if tokenMap[appservice.ASToken] {
return configErrors([]string{fmt.Sprintf(
"Application service Token %s must be unique", appservice.ASToken,
)})
}
// Add the id/token to their respective maps if we haven't already
// seen them.
idMap[appservice.ID] = true
tokenMap[appservice.ASToken] = true
// TODO: Remove once rate_limited is implemented
if appservice.RateLimited {
log.Warn("WARNING: Application service option rate_limited is currently unimplemented")
}
// TODO: Remove once protocols is implemented
if len(appservice.Protocols) > 0 {
log.Warn("WARNING: Application service option protocols is currently unimplemented")
}
}
return setupRegexps(config)
}
// validateNamespace returns nil or an error based on whether a given
// application service namespace is valid. A namespace is valid if it has the
// required fields, and its regex is correct.
func validateNamespace(
appservice *ApplicationService,
key string,
namespace *ApplicationServiceNamespace,
groupIDRegexp *regexp.Regexp,
) error {
// Check that namespace(s) are valid regex
if !IsValidRegex(namespace.Regex) {
return configErrors([]string{fmt.Sprintf(
"Invalid regex string for Application Service %s", appservice.ID,
)})
}
// Check if GroupID for the users namespace is in the correct format
if key == "users" && namespace.GroupID != "" {
// TODO: Remove once group_id is implemented
log.Warn("WARNING: Application service option group_id is currently unimplemented")
correctFormat := groupIDRegexp.MatchString(namespace.GroupID)
if !correctFormat {
return configErrors([]string{fmt.Sprintf(
"Invalid user group_id field for application service %s.",
appservice.ID,
)})
}
}
return nil
}
// IsValidRegex returns true or false based on whether the
// given string is valid regex or not
func IsValidRegex(regexString string) bool {
_, err := regexp.Compile(regexString)
return err == nil
}