├── .editorconfig ├── .gitignore ├── .gitlab-ci.yml ├── Dockerfile ├── LICENSE ├── README.md ├── example-config.yaml ├── go.mod ├── go.sum └── mauliasproxy.go /.editorconfig: -------------------------------------------------------------------------------- 1 | root = true 2 | 3 | [*] 4 | indent_style = tab 5 | indent_size = 4 6 | end_of_line = lf 7 | charset = utf-8 8 | trim_trailing_whitespace = true 9 | insert_final_newline = true 10 | 11 | [*.{yaml,yml}] 12 | indent_style = space 13 | 14 | [.gitlab-ci.yml] 15 | indent_size = 2 16 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | config.yaml 2 | -------------------------------------------------------------------------------- /.gitlab-ci.yml: -------------------------------------------------------------------------------- 1 | build docker: 2 | image: docker:stable 3 | stage: build 4 | before_script: 5 | - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY 6 | script: 7 | - docker build -t $CI_REGISTRY_IMAGE:latest . 8 | - docker push $CI_REGISTRY_IMAGE:latest 9 | only: 10 | - master 11 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM golang:1-alpine AS builder 2 | 3 | RUN apk add --no-cache ca-certificates 4 | WORKDIR /build/mauliasproxy 5 | COPY . /build/mauliasproxy 6 | ENV CGO_ENABLED=0 7 | RUN go build -o /usr/bin/mauliasproxy 8 | 9 | FROM scratch 10 | 11 | COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ 12 | COPY --from=builder /usr/bin/mauliasproxy /usr/bin/mauliasproxy 13 | 14 | VOLUME /data 15 | WORKDIR /data 16 | CMD ["/usr/bin/mauliasproxy"] 17 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 602 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 603 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 604 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 605 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 606 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 607 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 608 | SUCH DAMAGES. 609 | 610 | 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published by 637 | the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Maunium Matrix room alias proxy 2 | This is a simple room alias proxy that can respond to the [federation alias 3 | query endpoint]. The purpose is to allow creating room addresses with vanity 4 | domains without having to run a full-blown Matrix homeserver. 5 | 6 | Discussion room: [#maunium:mau.dev](https://matrix.to/#/#maunium:mau.dev) 7 | 8 | [federation alias query endpoint]: https://spec.matrix.org/v1.7/server-server-api/#get_matrixfederationv1querydirectory 9 | 10 | ## Setup 11 | You can either build the Go program yourself (just `git clone` + `go build`), 12 | or use the docker image `dock.mau.dev/tulir/mauliasproxy`. 13 | 14 | After that, copy [example-config.yaml](example-config.yaml) to `config.yaml` 15 | and fill out the details you want. If using docker, mount the directory with 16 | `config.yaml` at `/data`. 17 | 18 | Finally set up your reverse proxy to proxy `/_matrix/federation/v1/query/directory` 19 | on the alias domains to mauliasproxy. 20 | 21 | Optionally, you may also proxy: 22 | * `/.well-known/matrix/server` to have mauliasproxy handle delegation to 443. 23 | * `/_matrix/federation/v1/version` and `/_matrix/key/v2/server` to make the federation tester pass. 24 | * To enable the key server endpoint, fill the `server_keys` section in the config. 25 | * `/_matrix/federation/*` to respond with a proper `M_NOT_FOUND` code to make old Synapses work. 26 | -------------------------------------------------------------------------------- /example-config.yaml: -------------------------------------------------------------------------------- 1 | # Homeserver URL to resolve aliases with. 2 | homeserver_url: https://matrix-client.matrix.org 3 | # Alias mapping. The key is the local alias, the value is the alias that's resolved to get the room ID and server list. 4 | aliases: 5 | "#matrix:example.com": "#matrix:matrix.org" 6 | # Pattern mappings. The key is a regular expression (RE2 syntax) and the value is a replacement. 7 | # If an alias doesn't match any of the static mappings, each pattern here is tested in order. The first matching regex 8 | # is used to replace the input alias with the replacement here, and the result is resolved to get the room ID. 9 | patterns: 10 | "^#(.+):freenode.net$": "#freenode_#$1:matrix.org" 11 | # How long (in seconds) should resolved room IDs and server lists be cached? 12 | cache_ttl: 3600 13 | # IP and port to listen on 14 | listen: :8008 15 | # What address to serve in the /.well-known/matrix/server file 16 | server_well_known: example.com:443 17 | # Optionally, server names and signing keys to respond to /_matrix/key/v2/server 18 | server_keys: 19 | # The key is the Host header that mauliasproxy should expect. 20 | # `default` is used for everything that doesn't match another key. 21 | default: 22 | # The server name to respond with. Optional, defaults to host. 23 | server_name: example.com 24 | # The signing key to use in Synapse format (`ed25519 keyid base64key`) 25 | # Can be set to `env:NAME` to read the value from `NAME` in the environment. 26 | # A random key can be generated with `mauliasproxy genkey` 27 | signing_key: ed25519 0 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 28 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module maunium.net/go/mauliasproxy 2 | 3 | go 1.23.0 4 | 5 | toolchain go1.24.0 6 | 7 | require gopkg.in/yaml.v2 v2.3.0 8 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM= 2 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 3 | gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU= 4 | gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 5 | -------------------------------------------------------------------------------- /mauliasproxy.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "crypto/ed25519" 5 | "crypto/rand" 6 | "encoding/base64" 7 | "encoding/json" 8 | "fmt" 9 | "net/http" 10 | "net/url" 11 | "os" 12 | "regexp" 13 | "strings" 14 | "time" 15 | 16 | "gopkg.in/yaml.v2" 17 | ) 18 | 19 | type RegexRule struct { 20 | Pattern *regexp.Regexp 21 | Replacement string 22 | } 23 | 24 | type Config struct { 25 | HomeserverURL string `yaml:"homeserver_url"` 26 | Aliases map[string]string `yaml:"aliases"` 27 | RawPatterns yaml.MapSlice `yaml:"patterns"` 28 | Patterns []RegexRule `yaml:"-"` 29 | CacheTTL int64 `yaml:"cache_ttl"` 30 | 31 | Listen string `yaml:"listen"` 32 | ServerWellKnown string `yaml:"server_well_known"` 33 | 34 | ServerKeys map[string]*ServerKey `yaml:"server_keys"` 35 | } 36 | 37 | type ServerKey struct { 38 | ServerName string `yaml:"server_name"` 39 | SigningKey string `yaml:"signing_key"` 40 | 41 | signingKeyID string `yaml:"-"` 42 | signingKeyPubB64 string `yaml:"-"` 43 | signingKeyPriv ed25519.PrivateKey `yaml:"-"` 44 | } 45 | 46 | type WellKnownResponse struct { 47 | ServerName string `json:"m.server"` 48 | } 49 | 50 | type ErrorResponse struct { 51 | Code string `json:"errcode"` 52 | Message string `json:"error"` 53 | } 54 | 55 | const MNotFound = "M_NOT_FOUND" 56 | const MUnrecognized = "M_UNRECOGNIZED" 57 | 58 | type RoomDirectoryResponse struct { 59 | RoomID string `json:"room_id"` 60 | Servers []string `json:"servers"` 61 | 62 | FetchedAt int64 `json:"-"` 63 | Exists bool `json:"-"` 64 | } 65 | 66 | var cfg Config 67 | var homeserverURL *url.URL 68 | var cache = make(map[string]RoomDirectoryResponse) 69 | 70 | func resolveAlias(alias string) (respData RoomDirectoryResponse) { 71 | existingData, ok := cache[alias] 72 | if ok && existingData.FetchedAt+cfg.CacheTTL > time.Now().Unix() { 73 | return existingData 74 | } 75 | resp, err := http.Get((&url.URL{ 76 | Scheme: homeserverURL.Scheme, 77 | User: homeserverURL.User, 78 | Host: homeserverURL.Host, 79 | Path: fmt.Sprintf("/_matrix/client/v3/directory/room/%s", alias), 80 | RawPath: fmt.Sprintf("/_matrix/client/v3/directory/room/%s", url.PathEscape(alias)), 81 | }).String()) 82 | if err != nil { 83 | fmt.Printf("Failed to resolve %s: %v\n", alias, err) 84 | } else if resp.StatusCode != http.StatusOK { 85 | fmt.Printf("Resolving %s responded with HTTP %d %s\n", alias, resp.StatusCode, resp.Status) 86 | } else if err = json.NewDecoder(resp.Body).Decode(&respData); err != nil { 87 | fmt.Printf("Failed to parse response when resolving %s: %v\n", alias, err) 88 | } else { 89 | respData.Exists = true 90 | fmt.Printf("Successfully resolved %s -> %s with %d servers\n", alias, respData.RoomID, len(respData.Servers)) 91 | } 92 | if existingData.Exists && !respData.Exists { 93 | fmt.Printf("Using expired cached result for %s as new resolving failed\n", alias) 94 | return existingData 95 | } 96 | respData.FetchedAt = time.Now().Unix() 97 | cache[alias] = respData 98 | return 99 | } 100 | 101 | func findAliasTarget(alias string) (string, bool) { 102 | target, ok := cfg.Aliases[alias] 103 | if ok { 104 | return target, true 105 | } 106 | for _, rule := range cfg.Patterns { 107 | if rule.Pattern.MatchString(alias) { 108 | return rule.Pattern.ReplaceAllString(alias, rule.Replacement), true 109 | } 110 | } 111 | return "", false 112 | } 113 | 114 | func queryDirectory(w http.ResponseWriter, req *http.Request) { 115 | w.Header().Add("Content-Type", "application/json") 116 | alias := req.URL.Query().Get("room_alias") 117 | target, ok := findAliasTarget(alias) 118 | if !ok { 119 | w.WriteHeader(http.StatusNotFound) 120 | _ = json.NewEncoder(w).Encode(ErrorResponse{ 121 | Code: MNotFound, 122 | Message: fmt.Sprintf("Room alias %s not found", alias), 123 | }) 124 | return 125 | } 126 | resp := resolveAlias(target) 127 | if !resp.Exists { 128 | w.WriteHeader(http.StatusNotFound) 129 | _ = json.NewEncoder(w).Encode(ErrorResponse{ 130 | Code: MNotFound, 131 | Message: fmt.Sprintf("Failed to resolve %s", target), 132 | }) 133 | return 134 | } 135 | w.WriteHeader(http.StatusOK) 136 | _ = json.NewEncoder(w).Encode(resp) 137 | } 138 | 139 | func serverWellKnown(w http.ResponseWriter, _ *http.Request) { 140 | w.Header().Add("Content-Type", "application/json") 141 | _ = json.NewEncoder(w).Encode(WellKnownResponse{ServerName: cfg.ServerWellKnown}) 142 | } 143 | 144 | func serverVersion(w http.ResponseWriter, _ *http.Request) { 145 | w.Header().Add("Content-Type", "application/json") 146 | _ = json.NewEncoder(w).Encode(map[string]any{ 147 | "server": map[string]any{ 148 | "name": "mauliasproxy", 149 | "version": "1.1.0", 150 | "🐈‍⬛": "https://github.com/tulir/mauliasproxy", 151 | }, 152 | }) 153 | } 154 | 155 | type ServerKeyResponse struct { 156 | OldVerifyKeys map[string]any `json:"old_verify_keys"` 157 | ServerName string `json:"server_name"` 158 | Signatures map[string]map[string]string `json:"signatures,omitempty"` 159 | ValidUntilTS int64 `json:"valid_until_ts"` 160 | VerifyKeys map[string]map[string]string `json:"verify_keys"` 161 | } 162 | 163 | func generateServerKey(domain string) *ServerKeyResponse { 164 | keys, ok := cfg.ServerKeys[domain] 165 | if !ok { 166 | keys, ok = cfg.ServerKeys["default"] 167 | if !ok { 168 | return nil 169 | } 170 | } 171 | var resp ServerKeyResponse 172 | if keys.ServerName == "" { 173 | resp.ServerName = domain 174 | } else { 175 | resp.ServerName = keys.ServerName 176 | } 177 | resp.OldVerifyKeys = map[string]any{} 178 | resp.ValidUntilTS = time.Now().Add(time.Hour * 24).UnixMilli() 179 | resp.VerifyKeys = map[string]map[string]string{ 180 | keys.signingKeyID: { 181 | "key": keys.signingKeyPubB64, 182 | }, 183 | } 184 | payload, _ := json.Marshal(&resp) 185 | resp.Signatures = map[string]map[string]string{ 186 | resp.ServerName: { 187 | keys.signingKeyID: base64.RawURLEncoding.EncodeToString(ed25519.Sign(keys.signingKeyPriv, payload)), 188 | }, 189 | } 190 | return &resp 191 | } 192 | 193 | func serverKey(w http.ResponseWriter, r *http.Request) { 194 | r.URL.Host = r.Host 195 | w.Header().Add("Content-Type", "application/json") 196 | resp := generateServerKey(r.URL.Hostname()) 197 | if resp == nil { 198 | w.WriteHeader(http.StatusNotFound) 199 | _ = json.NewEncoder(w).Encode(ErrorResponse{ 200 | Code: MNotFound, 201 | Message: "No server keys found", 202 | }) 203 | return 204 | } else { 205 | _ = json.NewEncoder(w).Encode(&resp) 206 | } 207 | } 208 | 209 | func queryKey(w http.ResponseWriter, r *http.Request) { 210 | serverName := strings.TrimPrefix(r.URL.Path, "/_matrix/key/v2/query/") 211 | if strings.ContainsRune(serverName, '/') { 212 | notFound(w, r) 213 | return 214 | } 215 | w.Header().Add("Content-Type", "application/json") 216 | resp := generateServerKey(serverName) 217 | if resp == nil { 218 | w.WriteHeader(http.StatusNotFound) 219 | _ = json.NewEncoder(w).Encode(ErrorResponse{ 220 | Code: MNotFound, 221 | Message: "No server keys found", 222 | }) 223 | } else { 224 | _ = json.NewEncoder(w).Encode(map[string]any{ 225 | "server_keys": []any{resp}, 226 | }) 227 | } 228 | } 229 | 230 | func notFound(w http.ResponseWriter, _ *http.Request) { 231 | w.Header().Add("Content-Type", "application/json") 232 | w.WriteHeader(http.StatusNotFound) 233 | _ = json.NewEncoder(w).Encode(ErrorResponse{ 234 | Code: MUnrecognized, 235 | Message: "This is a mauliasproxy instance that doesn't handle anything other than federation alias queries", 236 | }) 237 | } 238 | 239 | func main() { 240 | if len(os.Args) > 0 && os.Args[len(os.Args)-1] == "genkey" { 241 | pub, priv, err := ed25519.GenerateKey(rand.Reader) 242 | if err != nil { 243 | panic(err) 244 | } 245 | fmt.Println("ed25519", base64.RawURLEncoding.EncodeToString(pub[:4]), base64.RawStdEncoding.EncodeToString(priv.Seed())) 246 | os.Exit(0) 247 | } 248 | data, err := os.ReadFile("config.yaml") 249 | if err != nil { 250 | _, _ = fmt.Fprintln(os.Stderr, "Failed to read config.yaml:", err) 251 | os.Exit(2) 252 | } 253 | err = yaml.Unmarshal(data, &cfg) 254 | if err != nil { 255 | _, _ = fmt.Fprintln(os.Stderr, "Failed to parse config.yaml:", err) 256 | os.Exit(3) 257 | } 258 | for host, key := range cfg.ServerKeys { 259 | if key.SigningKey == "ed25519 0 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" { 260 | _, _ = fmt.Fprintln(os.Stderr, "Ignoring example server key") 261 | delete(cfg.ServerKeys, host) 262 | continue 263 | } 264 | if strings.HasPrefix(key.SigningKey, "env:") { 265 | key.SigningKey = os.Getenv(strings.ToUpper(strings.TrimPrefix(key.SigningKey, "env:"))) 266 | } 267 | parts := strings.Split(key.SigningKey, " ") 268 | if len(parts) != 3 || parts[0] != "ed25519" { 269 | _, _ = fmt.Fprintln(os.Stderr, "Invalid signing key for", key.ServerName) 270 | os.Exit(4) 271 | } 272 | decoded, err := base64.RawStdEncoding.DecodeString(parts[2]) 273 | if err != nil { 274 | _, _ = fmt.Fprintf(os.Stderr, "Invalid signing key for %s: %v\n", key.ServerName, err) 275 | os.Exit(4) 276 | } 277 | if key.ServerName == "" && host != "default" { 278 | key.ServerName = host 279 | } 280 | key.signingKeyID = "ed25519:" + parts[1] 281 | key.signingKeyPriv = ed25519.NewKeyFromSeed(decoded) 282 | key.signingKeyPubB64 = base64.RawStdEncoding.EncodeToString(key.signingKeyPriv.Public().(ed25519.PublicKey)) 283 | } 284 | cfg.Patterns = make([]RegexRule, len(cfg.RawPatterns)) 285 | for index, rawPattern := range cfg.RawPatterns { 286 | match := rawPattern.Key.(string) 287 | compiled, err := regexp.Compile(match) 288 | if err != nil { 289 | _, _ = fmt.Fprintf(os.Stderr, "Failed to compile pattern '%s': %v", match, err) 290 | os.Exit(4) 291 | } 292 | cfg.Patterns[index] = RegexRule{ 293 | Pattern: compiled, 294 | Replacement: rawPattern.Value.(string), 295 | } 296 | } 297 | homeserverURL, err = url.Parse(cfg.HomeserverURL) 298 | if err != nil { 299 | _, _ = fmt.Fprintln(os.Stderr, "Failed to parse homeserver URL:", err) 300 | os.Exit(5) 301 | } 302 | 303 | http.HandleFunc("/_matrix/federation/v1/query/directory", queryDirectory) 304 | http.HandleFunc("/.well-known/matrix/server", serverWellKnown) 305 | http.HandleFunc("/_matrix/federation/v1/version", serverVersion) 306 | if len(cfg.ServerKeys) > 0 { 307 | http.HandleFunc("/_matrix/key/v2/server", serverKey) 308 | //http.HandleFunc("/_matrix/key/v2/query/", queryKey) 309 | } 310 | http.HandleFunc("/", notFound) 311 | 312 | fmt.Println("Listening on", cfg.Listen) 313 | err = http.ListenAndServe(cfg.Listen, nil) 314 | if err != nil { 315 | _, _ = fmt.Fprintln(os.Stderr, "Error in HTTP listener:", err) 316 | os.Exit(10) 317 | } 318 | } 319 | --------------------------------------------------------------------------------