add the ability to generate a QR code for 2fa secrets

Cargo.lock

@@ -135,6 +135,12 @@ version = "3.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37ccbd214614c6783386c1af30caf03192f17891059cecc394b4fb119e363de3"
 
+[[package]]
+name = "bytemuck"
+version = "1.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aaa3a8d9a1ca92e282c96a32d6511b695d7d994d1d102ba85d279f9b2756947f"
+
 [[package]]
 name = "byteorder"
 version = "1.4.3"
@@ -159,6 +165,12 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "checked_int_cast"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17cc5e6b5ab06331c33589842070416baa137e8b0eb912b008cfd4a78ada7919"
+
 [[package]]
 name = "chrono"
 version = "0.4.19"
@@ -229,6 +241,12 @@ dependencies = [
  "os_str_bytes",
 ]
 
+[[package]]
+name = "color_quant"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
+
 [[package]]
 name = "const-oid"
 version = "0.6.2"
@@ -748,6 +766,20 @@ dependencies = [
  "unicode-normalization",
 ]
 
+[[package]]
+name = "image"
+version = "0.23.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24ffcb7e7244a9bf19d35bf2883b9c080c4ced3c07a9895572178cdb8f13f6a1"
+dependencies = [
+ "bytemuck",
+ "byteorder",
+ "color_quant",
+ "num-iter",
+ "num-rational",
+ "num-traits",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.8.2"
@@ -956,6 +988,17 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-rational"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12ac428b1cb17fce6f731001d307d351ec70a6d202fc2e60f7d4c5e42d8f4f07"
+dependencies = [
+ "autocfg 1.1.0",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.15"
@@ -1236,6 +1279,16 @@ dependencies = [
  "psl-types",
 ]
 
+[[package]]
+name = "qrcode"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16d2f1455f3630c6e5107b4f2b94e74d76dea80736de0981fd27644216cff57f"
+dependencies = [
+ "checked_int_cast",
+ "image",
+]
+
 [[package]]
 name = "quick-error"
 version = "1.2.3"
@@ -1933,6 +1986,7 @@ dependencies = [
  "lazy_static 1.4.0",
  "log",
  "proptest",
+ "qrcode",
  "rand 0.8.5",
  "regex",
  "reqwest",

Cargo.toml

@@ -15,6 +15,10 @@ categories = ["command-line-utilities"]
 repository = "https://github.com/dyc3/steamguard-cli"
 license = "GPL-3.0-or-later"
 
+[features]
+default = ["qr"]
+qr = ["qrcode"]
+
 [[bin]]
 name = "steamguard-cli"
 # filename = "steamguard" # TODO: uncomment when https://github.com/rust-lang/cargo/issues/9778 is stablized.
@@ -48,6 +52,7 @@ aes = "0.7.4"
 block-modes = "0.8.1"
 thiserror = "1.0.26"
 crossterm = { version = "0.23.2", features = ["event-stream"] }
+qrcode = { version = "0.12.0", optional = true }
 
 [dev-dependencies]
 tempdir = "0.3"

README.md

@@ -55,7 +55,18 @@ steamguard-cli | xclip -selection clipboard
 
 ## Importing 2FA Secret Into Other Applications
 
-It's possible to import your 2FA secret into other applications, like Google Authenticator or KeeWeb. The `uri` field contains a URI in that starts with `otpauth://...`, which you can create a QR code for.
+It's possible to import your 2FA secret into other applications. This is useful if you want to use a password manager to generate your 2FA codes, like KeeWeb.
+
+To make this easy, steamguard-cli can generate a QR code for your 2FA secret. You can then scan this QR code with your password manager.
+
+```bash
+steamguard qr # print QR code for the first account in your maFiles
+steamguard -u <account name> qr # print QR code for a specific account
+```
+
+There are some applications that do not generate correct 2fa codes from the secret, so **do not use them**:
+- Google Authenticator
+- Authy
 
 # Contributing
 

src/cli.rs

@@ -55,6 +55,8 @@ pub(crate) enum Subcommands {
 	Encrypt(ArgsEncrypt),
 	Decrypt(ArgsDecrypt),
 	Code(ArgsCode),
+	#[cfg(feature = "qr")]
+	Qr(ArgsQr),
 }
 
 #[derive(Debug, Clone, Copy, ArgEnum)]
@@ -174,3 +176,14 @@ impl From<Args> for ArgsCode {
 		args.code
 	}
 }
+
+#[derive(Debug, Clone, Parser)]
+#[clap(about = "Generate QR codes. This *will* print sensitive data to stdout.")]
+#[cfg(feature = "qr")]
+pub(crate) struct ArgsQr {
+	#[clap(
+		long,
+		help = "Force using ASCII chars to generate QR codes. Useful for terminals that don't support unicode."
+	)]
+	pub ascii: bool,
+}

src/main.rs

@@ -2,6 +2,8 @@ extern crate rpassword;
 use clap::{IntoApp, Parser};
 use crossterm::tty::IsTty;
 use log::*;
+#[cfg(feature = "qr")]
+use qrcode::QrCode;
 use std::time::{SystemTime, UNIX_EPOCH};
 use std::{
 	io::{stdout, Write},
@@ -179,6 +181,10 @@ fn run() -> anyhow::Result<()> {
 		cli::Subcommands::Code(args) => {
 			return do_subcmd_code(args, selected_accounts);
 		}
+		#[cfg(feature = "qr")]
+		cli::Subcommands::Qr(args) => {
+			return do_subcmd_qr(args, selected_accounts);
+		}
 		s => {
 			error!("Unknown subcommand: {:?}", s);
 			return Err(errors::UserError::UnknownSubcommand.into());
@@ -690,3 +696,40 @@ fn do_subcmd_code(
 	}
 	return Ok(());
 }
+
+#[cfg(feature = "qr")]
+fn do_subcmd_qr(
+	args: cli::ArgsQr,
+	selected_accounts: Vec<Arc<Mutex<SteamGuardAccount>>>,
+) -> anyhow::Result<()> {
+	use anyhow::Context;
+
+	info!(
+		"Generating QR codes for {} accounts",
+		selected_accounts.len()
+	);
+
+	for account in selected_accounts {
+		let account = account.lock().unwrap();
+		let qr = QrCode::new(account.uri.expose_secret())
+			.context(format!("generating qr code for {}", account.account_name))?;
+
+		info!("Printing QR code for {}", account.account_name);
+		let qr_string = if args.ascii {
+			qr.render()
+				.light_color(' ')
+				.dark_color('#')
+				.module_dimensions(2, 1)
+				.build()
+		} else {
+			use qrcode::render::unicode;
+			qr.render::<unicode::Dense1x2>()
+				.dark_color(unicode::Dense1x2::Light)
+				.light_color(unicode::Dense1x2::Dark)
+				.build()
+		};
+
+		println!("{}", qr_string);
+	}
+	return Ok(());
+}