├── .gitignore ├── Cargo.toml ├── src └── main.rs ├── README.md ├── Cargo.lock └── LICENSE.md /.gitignore: -------------------------------------------------------------------------------- 1 | /target 2 | /debug 3 | [._]*.s[a-v][a-z] 4 | *.json 5 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "matrix-message-decrypter" 3 | version = "0.1.0" 4 | edition = "2021" 5 | license = "GPLv3" 6 | 7 | [dependencies] 8 | base64 = "0.21.4" 9 | clap = { version = "4.4.6", features = ["derive"]} 10 | serde = "1.0.188" 11 | serde_json = "1.0.107" 12 | vodozemac = "0.5.0" 13 | -------------------------------------------------------------------------------- /src/main.rs: -------------------------------------------------------------------------------- 1 | use base64::Engine; 2 | use clap::Parser; 3 | use serde_json::Value; 4 | use std::collections::HashMap; 5 | use std::fs; 6 | use std::io::Write; 7 | 8 | #[derive(Parser)] 9 | #[command(author, version, about, long_about = None)] 10 | struct Args { 11 | /// Path of the decrypted E2E Room key export 12 | #[arg(short, long)] 13 | keyfile: String, 14 | 15 | /// Path of the JSON file containing the messages 16 | #[arg(short, long)] 17 | messagefile: String, 18 | 19 | /// Path to write the output JSON file (default: stdout) 20 | #[arg(short, long)] 21 | output: Option, 22 | } 23 | 24 | fn main() { 25 | let args = Args::parse(); 26 | 27 | let keyfile_data = fs::read_to_string(args.keyfile).expect("Unable to read keyfile"); 28 | let mut messagefile_reader = 29 | std::io::BufReader::new(fs::File::open(args.messagefile).expect("Unable to read messagefile")); 30 | let sessionkeys = get_sessionkeys_from_json(keyfile_data); 31 | 32 | let messages_stream = serde_json::Deserializer::from_reader(&mut messagefile_reader).into_iter().map(Result::unwrap); 33 | 34 | let mut output_file = args.output.map(|output| { 35 | std::io::BufWriter::new(std::fs::File::create(output).expect("Failed creating output file")) 36 | }); 37 | 38 | for decrypted_message in get_decrypted_messages(messages_stream, sessionkeys) { 39 | let serialized = serde_json::to_string(&decrypted_message).expect("Failed serlializing finished data to json"); 40 | 41 | if let Some(ref mut out) = output_file { 42 | out 43 | .write_all(serialized.as_bytes()) 44 | .expect("Failed writing to output file"); 45 | out 46 | .write_all(b"\n") 47 | .expect("Failed writing to output file"); 48 | } else { 49 | println!("{}", serialized); 50 | } 51 | } 52 | } 53 | 54 | fn get_decrypted_messages( 55 | messages: impl Iterator>, 56 | sessionkeys: HashMap, 57 | ) -> impl Iterator> { 58 | messages.map(move |mut m| { 59 | let message_id = m["event_id"].as_str().unwrap(); 60 | let j: HashMap = serde_json::from_str(&(m["json"].as_str().unwrap())) 61 | .expect(&format!("Error parsing message {message_id}")); 62 | 63 | let content = j["content"].as_object().unwrap(); 64 | 65 | if content.contains_key("session_id") && content.contains_key("ciphertext") { 66 | let session_id = content["session_id"].as_str().unwrap(); 67 | if sessionkeys.contains_key(session_id) { 68 | eprintln!("Message {message_id}: Decrypting using key {session_id}"); 69 | 70 | // we have to disable padding in the base64 decoder 71 | let sessionkey = base64::engine::general_purpose::STANDARD_NO_PAD 72 | .decode(&sessionkeys[session_id]) 73 | .unwrap(); 74 | let message = base64::engine::general_purpose::STANDARD_NO_PAD 75 | .decode(&content["ciphertext"].as_str().unwrap()) 76 | .unwrap(); 77 | if let Some(decrypted_message) = get_decrypted_ciphertext(sessionkey, message) { 78 | m.insert("content_decrypted".to_string(), serde_json::from_str(&decrypted_message).expect("Parsing decrypted message failed")); 79 | } else { 80 | eprintln!("Message {message_id}: Decrypting message failed unexpectedly"); 81 | } 82 | } else { 83 | eprintln!("Message {message_id}: No matching key found, skipping"); 84 | } 85 | } else { 86 | eprintln!("Message {message_id}: No encrypted payload, skipping"); 87 | } 88 | m 89 | }) 90 | } 91 | 92 | fn get_sessionkeys_from_json(keys_raw: String) -> HashMap { 93 | eprintln!("Loading Sessionkeys"); 94 | 95 | let keys: Vec> = 96 | serde_json::from_str(&keys_raw).expect("Parsing keyfile failed: invalid format"); 97 | keys.iter().fold(HashMap::new(), |mut m, i| { 98 | m.insert( 99 | i["session_id"].as_str().unwrap().to_string(), 100 | i["session_key"].as_str().unwrap().to_string(), 101 | ); 102 | m 103 | }) 104 | } 105 | 106 | fn get_decrypted_ciphertext(sessionkey: Vec, ciphertext: Vec) -> Option { 107 | let session_key = vodozemac::megolm::ExportedSessionKey::from_bytes(&sessionkey).unwrap(); 108 | let mut session = vodozemac::megolm::InboundGroupSession::import( 109 | &session_key, 110 | vodozemac::megolm::SessionConfig::version_1(), 111 | ); 112 | 113 | let decrypted = session 114 | .decrypt(&vodozemac::megolm::MegolmMessage::from_bytes(&ciphertext).unwrap()) 115 | .ok()?; 116 | 117 | Some(String::from_utf8(decrypted.plaintext).unwrap()) 118 | } 119 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Matrix Message Decrypter 2 | 3 | Decrypt Matrix Megolm messages using E2E key backups 4 | 5 | ## What? 6 | 7 | It's a small Rust utility that allows you to use your E2E Room backup keys to decrypt Megolm encrypted messages sent via the Matrix protocol. 8 | 9 | There are some special use cases for this tool, let's say you want to recover messages from your homeserver that went potatoes, or you need to access old messages from a blocked user. 10 | Normally you don't need this, except for when things went wrong. 11 | 12 | If you work in law enforcement: stop reading and find a better job. 13 | 14 | This tool is my first Rust project and I wrote it in two evenings, there is no proper error handling, etc., be warned. I don't think it will eat your homework, but if it does it's your own fault. 15 | 16 | ## Credits 17 | 18 | The [vodozemac](https://github.com/matrix-org/vodozemac) crate does all the heavy lifting here. Thanks! 19 | 20 | ## Usage 21 | ``` 22 | Usage: matrix-message-decrypter [OPTIONS] --keyfile --messagefile 23 | 24 | Options: 25 | -k, --keyfile Path of the decrypted E2E Room key export 26 | -m, --messagefile Path of the json file containing the messages 27 | -o, --output Path to write the output json file (default: stdout) 28 | -h, --help Print help 29 | -V, --version Print version 30 | ``` 31 | 32 | ## User Guide 33 | 34 | We need to perform multiple steps to decrypt our messages: 35 | 1. Gather the messages we want to decrypt from the Homeserver database 36 | 2. Back up session keys 37 | 3. Decrypt session keys 38 | 4. Use this tool to decrypt messages 39 | 40 | ### Create Key Backup 41 | 42 | Element Desktop: 43 | 1. Click on your profile picture 44 | 2. Security and Privacy 45 | 3. Cryptography -> Export E2E room keys 46 | 4. Set a passphrase and save the file 47 | 48 | ### Decrypt Key Backup 49 | 50 | There's a handy [Python tool to decrypt the key backup](https://github.com/cyphar/matrix-utils/) 51 | It needs the Python package `PyCryptodome`. You'll figure it how to get this to work. 52 | 53 | Decrypt your E2E key file using the passphrase you just set: 54 | ```bash 55 | # python megolm_backup.py --from element-keys.txt > element-keys-decrypted.json 56 | Backup passphrase [mode=decrypt]: 57 | ``` 58 | 59 | ### Export Encrypted Messages 60 | 61 | First we need to gather a dump of/ all messages. 62 | In this example we use the JSON export feature of Postgres to export events from the Synapse database. 63 | 64 | Export all events: 65 | `psql -d matrix-synapse -qAtX -c "select row_to_json(event_json) from event_json;" -o messages.json` 66 | 67 | Export all events from specific room: 68 | `psql -d matrix-synapse -qAtX -c "select row_to_json(event_json) FROM event_json WHERE room_id = '!dfKadcascAbtdeeJdb:example.com';" -o messages.json` 69 | 70 | ### Using this tool 71 | 72 | Clone and build: 73 | ```bash 74 | git clone https://github.com/vidister/matrix-message-decrypter 75 | cd matrix-message-decrypter 76 | cargo build --release 77 | ``` 78 | 79 | Usage example: 80 | ```bash 81 | # ./target/release/matrix-message-decrypter --keyfile keys.json --messagefile messages.json --output messages_decrypted.json 82 | 83 | Loading Sessionkeys 84 | Message $pcUildviZA99Sg-RwSaEhVoZzWAjHmdg_u2Dgo7R1yG: Decrypting using key QE9ZaUEayIlJ+V7FPAqvGUlyuSE4MYw+HOvXEZCBOhk 85 | Message $bq1td7Onf2bFCfk3VdYuQS8PHnu5RqAwpwU4y5Het-0: No encrypted payload, skipping 86 | Message $Rbci30NE6oOdhzly-G0Px8XVHwp9QeadZuY98NJu0IM: No encrypted payload, skipping 87 | Message $aAWJHX2QRO_HVBFQiAfe7dQvdWZrCGdOwOFRFkFenIk: Decrypting using key Gl4Bk49rdv+u691gAJlaDlPdYnwIaY+q69MHn17qUpg 88 | Message $kBaxX3l6ctnCDiu6NPdDNNsEgaDkSC6yPb-1-Y3dLqg: No encrypted payload, skipping 89 | [...] 90 | ``` 91 | 92 | Decrypted messages in the output file have a new entry `content_decrypted`. 93 | Example: 94 | ```json 95 | { 96 | "content_decrypted": { 97 | "content": { 98 | "body": "This is the decrypted message body", 99 | "msgtype": "m.text" 100 | }, 101 | "room_id": "!eCCElDaZUXYYYMJTl:example.com", 102 | "type": "m.room.message" 103 | }, 104 | "internal_metadata": "{}", 105 | "format_version": 3, 106 | "event_id": "$pcUildviZA99Sg-RwSaEhVoZzWAjHmdg_u2Dgo7R1yG", 107 | "json": [...], 108 | "room_id": "!eCCmkElZUXYYYMJTl:example.com" 109 | } 110 | { 111 | [...] 112 | ``` 113 | 114 | You can use [jq](https://jqlang.github.io/jq/) to remove clutter: 115 | ```bash 116 | jq -s '[map(select(.content_decrypted))[] | { meta: .json|fromjson|pick(.room_id,.sender,.origin_server_ts), body: .content_decrypted.content.body }] | sort_by(.meta.origin_server_ts)' messages_decrypted.json 117 | 118 | [ 119 | { 120 | "meta": { 121 | "room_id": "!eCCElDaZUXYYYMJTl:example.com", 122 | "sender": "@bob:example.com", 123 | "origin_server_ts": 1639166427121 124 | }, 125 | "body": "This is the decrypted message body" 126 | } 127 | ] 128 | ``` 129 | 130 | ## License 131 | 132 | This software is licensed under the GNU General Public License version 3 or 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"ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69" 910 | dependencies = [ 911 | "proc-macro2", 912 | "quote", 913 | "syn", 914 | ] 915 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | # GNU GENERAL PUBLIC LICENSE 2 | 3 | Version 3, 29 June 2007 4 | 5 | Copyright (C) 2007 Free Software Foundation, Inc. 6 | 7 | 8 | Everyone is permitted to copy and distribute verbatim copies of this 9 | license document, but changing it is not allowed. 10 | 11 | ## Preamble 12 | 13 | The GNU General Public License is a free, copyleft license for 14 | software and other kinds of works. 15 | 16 | The licenses for most software and other practical works are designed 17 | to take away your freedom to share and change the works. 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Such new versions 564 | will be similar in spirit to the present version, but may differ in 565 | detail to address new problems or concerns. 566 | 567 | Each version is given a distinguishing version number. If the Program 568 | specifies that a certain numbered version of the GNU General Public 569 | License "or any later version" applies to it, you have the option of 570 | following the terms and conditions either of that numbered version or 571 | of any later version published by the Free Software Foundation. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 590 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT 591 | WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT 592 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 593 | A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND 594 | PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE 595 | DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR 596 | CORRECTION. 597 | 598 | ### 16. 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 602 | CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 603 | INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES 604 | ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT 605 | NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR 606 | LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM 607 | TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER 608 | PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 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 626 | terms. 627 | 628 | To do so, attach the following notices to the program. It is safest to 629 | attach them to the start of each source file to most effectively state 630 | the exclusion of warranty; and each file should have at least the 631 | "copyright" line and a pointer to where the full notice is found. 632 | 633 | 634 | Copyright (C) 635 | 636 | This program is free software: you can redistribute it and/or modify 637 | it under the terms of the GNU General Public License as published by 638 | the Free Software Foundation, either version 3 of the License, or 639 | (at your option) any later version. 640 | 641 | This program is distributed in the hope that it will be useful, 642 | but WITHOUT ANY WARRANTY; without even the implied warranty of 643 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 644 | GNU General Public License for more details. 645 | 646 | You should have received a copy of the GNU General Public License 647 | along with this program. If not, see . 648 | 649 | Also add information on how to contact you by electronic and paper 650 | mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands \`show w' and \`show c' should show the 661 | appropriate parts of the General Public License. Of course, your 662 | program's commands might be different; for a GUI interface, you would 663 | use an "about box". 664 | 665 | You should also get your employer (if you work as a programmer) or 666 | school, if any, to sign a "copyright disclaimer" for the program, if 667 | necessary. For more information on this, and how to apply and follow 668 | the GNU GPL, see . 669 | 670 | The GNU General Public License does not permit incorporating your 671 | program into proprietary programs. If your program is a subroutine 672 | library, you may consider it more useful to permit linking proprietary 673 | applications with the library. If this is what you want to do, use the 674 | GNU Lesser General Public License instead of this License. But first, 675 | please read . 676 | --------------------------------------------------------------------------------