err

.drone.yml

@@ -12,7 +12,7 @@ steps:
    environment:
     DEBIAN_FRONTEND: noninteractive
    commands:
-    - apt update && apt install -y cargo libkeyutils-dev libclang-dev clang pkg-config libcryptsetup-dev 
+    - apt update && apt install -y cargo libkeyutils-dev libclang-dev clang pkg-config libcryptsetup-dev libpam-dev 
     - cargo test --locked
  - name: publish
    image: ubuntu:focal
@@ -22,7 +22,7 @@ steps:
      from_secret: cargo_tkn
    commands:
     - grep -E 'version ?= ?"${DRONE_TAG}"' -i Cargo.toml || (printf "incorrect crate/tag version" && exit 1)
-    - apt update && apt install -y cargo libkeyutils-dev libclang-dev clang pkg-config libcryptsetup-dev 
+    - apt update && apt install -y cargo libkeyutils-dev libclang-dev clang pkg-config libcryptsetup-dev libpam-dev
     - cargo package --all-features
     - cargo publish --all-features
    when:

Cargo.lock

@@ -86,7 +86,7 @@ dependencies = [
  "lazycell",
  "log",
  "peeking_take_while",
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
  "regex",
  "rustc-hash",
@@ -100,18 +100,6 @@ version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
-[[package]]
-name = "bstr"
-version = "0.2.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "31accafdb70df7871592c058eca3985b71104e15ac32f64706022c58867da931"
-dependencies = [
- "lazy_static",
- "memchr",
- "regex-automata",
- "serde",
-]
-
 [[package]]
 name = "byteorder"
 version = "1.3.4"
@@ -130,9 +118,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.60"
+version = "1.0.59"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef611cc68ff783f18535d77ddd080185275713d852c4f5cbb6122c462a7a825c"
+checksum = "66120af515773fb005778dc07c261bd201ec8ce50bd6e7144c927753fe013381"
 
 [[package]]
 name = "cexpr"
@@ -256,19 +244,6 @@ dependencies = [
  "lazy_static",
 ]
 
-[[package]]
-name = "csv"
-version = "1.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00affe7f6ab566df61b4be3ce8cf16bc2576bca0963ceb0955e45d514bf9a279"
-dependencies = [
- "bstr",
- "csv-core",
- "itoa",
- "ryu",
- "serde",
-]
-
 [[package]]
 name = "csv-core"
 version = "0.1.10"
@@ -280,14 +255,14 @@ dependencies = [
 
 [[package]]
 name = "ctap_hmac"
-version = "0.4.3"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33ccc28f298181e943187fa63805e652bc4806ad43708beebd22c230fbe0baa3"
+checksum = "c5fec79b66e3a7bc6a7ace0f4c98f0748892b36d3c5c317fadfce0344fd185dc"
 dependencies = [
  "byteorder",
  "cbor-codec",
  "crossbeam",
- "csv",
+ "csv-core",
  "derive_builder",
  "failure",
  "failure_derive",
@@ -296,8 +271,6 @@ dependencies = [
  "rand 0.6.5",
  "ring",
  "rust-crypto",
- "serde",
- "serde_derive",
  "untrusted",
 ]
 
@@ -319,10 +292,10 @@ checksum = "f0c960ae2da4de88a91b2d920c2a7233b400bc33cb28453a2987822d8392519b"
 dependencies = [
  "fnv",
  "ident_case",
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
  "strsim 0.9.3",
- "syn 1.0.41",
+ "syn 1.0.40",
 ]
 
 [[package]]
@@ -333,7 +306,7 @@ checksum = "d9b5a2f4ac4969822c62224815d069952656cadc7084fdca9751e6d959189b72"
 dependencies = [
  "darling_core",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.40",
 ]
 
 [[package]]
@@ -344,9 +317,9 @@ checksum = "a2658621297f2cf68762a6f7dc0bb7e1ff2cfd6583daef8ee0fed6f7ec468ec0"
 dependencies = [
  "darling",
  "derive_builder_core",
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.40",
 ]
 
 [[package]]
@@ -356,16 +329,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2791ea3e372c8495c0bc2033991d76b512cd799d07491fbd6890124db9458bef"
 dependencies = [
  "darling",
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.40",
 ]
 
 [[package]]
 name = "either"
-version = "1.6.1"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+checksum = "cd56b59865bce947ac5958779cfa508f6c3b9497cc762b7e24a12d11ccde2c4f"
 
 [[package]]
 name = "env_logger"
@@ -396,26 +369,28 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa4da3c766cd7a0db8242e326e9e4e081edd567072893ed320008189715366a4"
 dependencies = [
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.40",
  "synstructure",
 ]
 
 [[package]]
 name = "fido2luks"
-version = "0.2.14"
+version = "0.2.15"
 dependencies = [
  "ctap_hmac",
  "failure",
  "hex",
  "libcryptsetup-rs",
+ "pamsm",
  "ring",
  "rpassword",
  "serde",
  "serde_derive",
  "serde_json",
  "structopt",
+ "sudo",
 ]
 
 [[package]]
@@ -459,9 +434,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.16"
+version = "0.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c30f6d0bc6b00693347368a67d41b58f2fb851215ff1da49e90fe2c5c667151"
+checksum = "3deed196b6e7f9e44a2ae8d94225d80302d81208b1bb673fd21fe634645c85a9"
 dependencies = [
  "libc",
 ]
@@ -507,9 +482,9 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "libc"
-version = "0.2.77"
+version = "0.2.76"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
+checksum = "755456fae044e6fa1ebbbd1b3e902ae19e73097ed4ed87bb79934a867c007bc3"
 
 [[package]]
 name = "libcryptsetup-rs"
@@ -571,21 +546,20 @@ checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
 
 [[package]]
 name = "memoffset"
-version = "0.5.6"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "043175f069eda7b85febe4a74abbaeff828d9f8b448515d3151a14a3542811aa"
+checksum = "c198b026e1bbf08a937e94c6c60f9ec4a2267f5b0d2eec9c1b21b061ce2be55f"
 dependencies = [
  "autocfg 1.0.1",
 ]
 
 [[package]]
 name = "miniz_oxide"
-version = "0.4.2"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c60c0dfe32c10b43a144bad8fc83538c52f58302c92300ea7ec7bf7b38d5a7b9"
+checksum = "4d7559a8a40d0f97e1edea3220f698f78b1c5ab67532e49f68fde3910323b722"
 dependencies = [
  "adler",
- "autocfg 1.0.1",
 ]
 
 [[package]]
@@ -624,6 +598,12 @@ version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ab52be62400ca80aa00285d25253d7f7c437b7375c4de678f5405d3afe82ca5"
 
+[[package]]
+name = "pamsm"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3580ed2ebe075c74db583233318abf4b07bc8d9a40c7691d0ae9c186e19e43dd"
+
 [[package]]
 name = "peeking_take_while"
 version = "0.1.2"
@@ -643,9 +623,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
 dependencies = [
  "proc-macro-error-attr",
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.40",
  "version_check",
 ]
 
@@ -655,7 +635,7 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
 dependencies = [
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
  "version_check",
 ]
@@ -671,9 +651,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.21"
+version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36e28516df94f3dd551a587da5357459d9b36d945a7c37c3557928c1c2ff2a2c"
+checksum = "175c513d55719db99da20232b06cda8bab6b83ec2d04e3283edf0213c37c1a29"
 dependencies = [
  "unicode-xid 0.2.1",
 ]
@@ -699,7 +679,7 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
 dependencies = [
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
 ]
 
 [[package]]
@@ -852,15 +832,6 @@ dependencies = [
  "thread_local",
 ]
 
-[[package]]
-name = "regex-automata"
-version = "0.1.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae1ded71d66a4a97f5e961fd0cb25a5f366a42a41570d16a763a69c092c26ae4"
-dependencies = [
- "byteorder",
-]
-
 [[package]]
 name = "regex-syntax"
 version = "0.6.18"
@@ -949,19 +920,19 @@ checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 
 [[package]]
 name = "serde"
-version = "1.0.116"
+version = "1.0.115"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96fe57af81d28386a513cbc6858332abc6117cfdb5999647c6444b8f43a370a5"
+checksum = "e54c9a88f2da7238af84b5101443f0c0d0a3bbdc455e34a5c9497b1903ed55d5"
 
 [[package]]
 name = "serde_derive"
-version = "1.0.116"
+version = "1.0.115"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f630a6370fd8e457873b4bd2ffdae75408bc291ba72be773772a4c2a065d9ae8"
+checksum = "609feed1d0a73cc36a0182a840a9b37b4a82f0b1150369f0536a9e3f2a31dc48"
 dependencies = [
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.40",
 ]
 
 [[package]]
@@ -995,9 +966,9 @@ checksum = "6446ced80d6c486436db5c078dde11a9f73d42b57fb273121e160b84f63d894c"
 
 [[package]]
 name = "structopt"
-version = "0.3.18"
+version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a33f6461027d7f08a13715659b2948e1602c31a3756aeae9378bfe7518c72e82"
+checksum = "6cc388d94ffabf39b5ed5fadddc40147cb21e605f53db6f8f36a625d27489ac5"
 dependencies = [
  "clap",
  "lazy_static",
@@ -1006,15 +977,25 @@ dependencies = [
 
 [[package]]
 name = "structopt-derive"
-version = "0.4.11"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c92e775028122a4b3dd55d58f14fc5120289c69bee99df1d117ae30f84b225c9"
+checksum = "5e2513111825077552a6751dfad9e11ce0fba07d7276a3943a037d7e93e64c5f"
 dependencies = [
  "heck",
  "proc-macro-error",
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.40",
+]
+
+[[package]]
+name = "sudo"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a88e74edf206f281aff2820aa2066c781331044c770626dcafe19491f214e05"
+dependencies = [
+ "libc",
+ "log",
 ]
 
 [[package]]
@@ -1030,11 +1011,11 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.41"
+version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6690e3e9f692504b941dc6c3b188fd28df054f7fb8469ab40680df52fdcc842b"
+checksum = "963f7d3cc59b59b9325165add223142bbf1df27655d07789f109896d353d8350"
 dependencies = [
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
  "unicode-xid 0.2.1",
 ]
@@ -1045,9 +1026,9 @@ version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b834f2d66f734cb897113e34aaff2f1ab4719ca946f9a7358dba8f8064148701"
 dependencies = [
- "proc-macro2 1.0.21",
+ "proc-macro2 1.0.20",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.40",
  "unicode-xid 0.2.1",
 ]
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fido2luks"
-version = "0.2.14"
+version = "0.2.15"
 authors = ["shimunn <shimun@shimun.net>"]
 edition = "2018"
 
@@ -24,6 +24,8 @@ libcryptsetup-rs = "0.4.1"
 serde_json = "1.0.51"
 serde_derive = "1.0.106"
 serde = "1.0.106"
+pamsm = { version = "0.4.1", features = ["libpam"] }
+sudo = "0.5.0"
 
 [build-dependencies]
 ctap_hmac = { version="0.4.2", features = ["request_multiple"] }
@@ -32,6 +34,7 @@ ring = "0.13.5"
 failure = "0.1.5"
 rpassword = "4.0.1"
 libcryptsetup-rs = "0.4.1"
+pamsm = { version = "0.4.1", features = ["libpam"] }
 structopt = "0.3.2"
 
 [profile.release]
@@ -41,12 +44,22 @@ panic = 'abort'
 incremental = false
 overflow-checks = false
 
+[[bin]]
+name = "fido2luks"
+path = "src/main.rs"
+
+[lib]
+name = "fido2luks_pam"
+path = "src/lib.rs"
+crate-type = ["cdylib"]
+
 [package.metadata.deb]
 depends = "$auto, cryptsetup"
-build-depends = "libclang-dev, libcryptsetup-dev"
+build-depends = "libclang-dev, libcryptsetup-dev, libpam-dev"
 extended-description = "Decrypt your LUKS partition using a FIDO2 compatible authenticator"
 assets = [
     ["target/release/fido2luks", "usr/bin/", "755"],
+    ["target/release/libfido2luks_pam.so", "usr/lib/x86_64-linux-gnu/security/pam_fido2luks.so", "755"],
     ["fido2luks.bash", "usr/share/bash-completion/completions/fido2luks", "644"],
     ["initramfs-tools/keyscript.sh", "/lib/cryptsetup/scripts/fido2luks", "755" ],
     ["initramfs-tools/hook/fido2luks.sh", "etc/initramfs-tools/hooks/", "755" ],

src/cli_args/mod.rs

@@ -5,8 +5,6 @@ use structopt::clap::AppSettings;
 use structopt::StructOpt;
 
 mod config;
-#[cfg(any(feature = "setup", test))]
-mod setup;
 
 pub use config::*;
 

src/cli_args/setup.rs

@@ -1,94 +0,0 @@
-use crate::cli_args::SecretInput;
-use crate::error::Fido2LuksResult;
-use crate::luks::LuksDevice;
-use std::io::{stdin, BufRead, BufReader};
-use std::path::{Path, PathBuf};
-
-enum Setup {
-    Welcome,
-    Disks {
-        disks: Vec<PathBuf>,
-    },
-    Unlocked {
-        disks: Vec<LuksDevice>,
-        current_secrets: Vec<Vec<u8>>,
-    },
-    Salt {
-        disks: Vec<PathBuf>,
-        current_secrets: Vec<Vec<u8>>,
-        salt: SecretInput,
-    },
-    Config {
-        salt: SecretInput,
-    },
-}
-
-impl Setup {
-    fn description(&self) -> String {
-        match self {
-            Self::Welcome => {
-                "Please enter the device path for all disks you want to protect".into()
-            }
-            _ => "".into(),
-        }
-    }
-
-    fn next(self) -> Fido2LuksResult<Self> {
-        println!("{}", self.description());
-        Ok(match self {
-            Self::Welcome => {
-                let mut disks = Vec::new();
-                for path in BufReader::new(stdin()).lines() {
-                    let path_string = path?;
-                    let path = match path_string.as_str() {
-                        "" => break,
-                        path => Path::new(path),
-                    };
-                    if path.exists() {
-                        disks.push(path.to_path_buf());
-                    } else {
-                        eprintln!(
-                            "{} does not exist, try again or hit enter to finish",
-                            path.display()
-                        );
-                    }
-                }
-                Self::Disks { disks }
-            }
-            Self::Disks { disks } => {
-                let mut luks_devs = Vec::new();
-                let add_dev = |path: &Path| -> Fido2LuksResult<Option<LuksDevice>> {
-                    match LuksDevice::load(path) {
-                        Ok(luks) => return Ok(Some(luks)),
-                        Err(dev) => {
-                            let mut ans = String::new();
-                            loop {
-                                eprint!("Failed to open {}\nIs it an LUKS device or could it be the mounted block device? Skip/Replace (s,r): ");
-                                stdin().read_line(&mut ans)?;
-                                match ans.as_str() {
-                                    "s" => return Ok(None),
-                                    "r" => {
-                                        print!("Enter an new device path: ");
-                                        stdin().read_line(&mut ans)?;
-                                        let path = PathBuf::from(&ans);
-                                        return add_dev(path.as_path());
-                                    }
-                                    _ => (),
-                                }
-                            }
-                        }
-                    }
-                    Ok(None)
-                };
-                for dev in disks.iter() {
-                    let path = PathBuf::from(&dev);
-                    if let Some(luks) = add_dev(path.as_path()) {
-                        luks_devs.push(luks);
-                    }
-                }
-                unreachable!()
-            }
-            _ => unreachable!(),
-        })
-    }
-}

src/error.rs

@@ -1,10 +1,10 @@
 use ctap::FidoError;
 use libcryptsetup_rs::LibcryptErr;
+use pamsm::PamError;
 use std::io;
 use std::io::ErrorKind;
 use std::string::FromUtf8Error;
 use Fido2LuksError::*;
-
 pub type Fido2LuksResult<T> = Result<T, Fido2LuksError>;
 
 #[derive(Debug, Fail)]
@@ -29,6 +29,10 @@ pub enum Fido2LuksError {
     WrongSecret,
     #[fail(display = "not an utf8 string")]
     StringEncodingError { cause: FromUtf8Error },
+    #[fail(display = "elevated privileges required")]
+    MissingPrivileges,
+    #[fail(display = "{}", cause)]
+    Configuration { cause: ConfigurationError },
 }
 
 impl Fido2LuksError {
@@ -50,6 +54,26 @@ pub enum AskPassError {
     IO(io::Error),
     #[fail(display = "provided passwords don't match")]
     Mismatch,
+    #[fail(display = "unable to retrieve password: {}", _0)]
+    Pam(PamError),
+}
+
+impl From<PamError> for AskPassError {
+    fn from(e: PamError) -> Self {
+        AskPassError::Pam(e)
+    }
+}
+
+impl From<io::Error> for AskPassError {
+    fn from(e: io::Error) -> Self {
+        AskPassError::IO(e)
+    }
+}
+
+impl From<AskPassError> for Fido2LuksError {
+    fn from(cause: AskPassError) -> Self {
+        Fido2LuksError::AskPassError { cause }
+    }
 }
 
 #[derive(Debug, Fail)]
@@ -112,3 +136,16 @@ impl From<FromUtf8Error> for Fido2LuksError {
         StringEncodingError { cause: e }
     }
 }
+#[derive(Debug, Fail)]
+pub enum ConfigurationError {
+    #[fail(display = "config is missing some values: {:?}", _0)]
+    Missing(Vec<String>),
+    #[fail(display = "config attribute {} contains an invalid value: {}", _1, _0)]
+    InvalidValue(String, String),
+}
+
+impl From<ConfigurationError> for Fido2LuksError {
+    fn from(cause: ConfigurationError) -> Fido2LuksError {
+        Fido2LuksError::Configuration { cause }
+    }
+}

src/lib.rs

@@ -0,0 +1,183 @@
+#[macro_use]
+extern crate failure;
+extern crate ctap_hmac as ctap;
+#[macro_use]
+extern crate serde_derive;
+use crate::cli_args::{CommaSeparated, HexEncoded};
+use crate::device::*;
+use crate::error::*;
+use crate::luks::*;
+use ctap::FidoCredential;
+use failure::_core::time::Duration;
+use pamsm::PamLibExt;
+use pamsm::*;
+use std::collections::{HashMap, HashSet};
+use std::path::Path;
+use std::str::FromStr;
+use sudo::{self, RunningAs};
+
+pub mod cli_args;
+pub mod device;
+pub mod error;
+pub mod luks;
+pub mod util;
+
+struct PamFido2Luks;
+
+impl PamFido2Luks {
+    fn open(
+        &self,
+        user: String,
+        mut password: impl FnMut(&str) -> PamResult<String>,
+        args: Vec<String>,
+    ) -> Fido2LuksResult<()> {
+        let args: HashMap<String, String> = args
+            .into_iter()
+            .filter_map(|arg| {
+                let mut parts = arg.split("=");
+                parts
+                    .by_ref()
+                    .next()
+                    .map(|key| (key.to_string(), parts.collect::<Vec<_>>().join("=")))
+            })
+            .collect();
+
+        let credentials = match args.get("credentials").map(|creds| {
+            <CommaSeparated<String>>::from_str(creds)
+                .map(|cs| cs.0)
+                .map_err(|_| ConfigurationError::InvalidValue("credentials".into(), creds.into()))
+        }) {
+            Some(creds) => creds?,
+            _ => Vec::new(),
+        };
+        let pin = args.get("pin");
+        let pin_prefix = args
+            .get("pin-prefix")
+            .map(|p| p.parse::<bool>().unwrap_or_default())
+            .unwrap_or_default();
+        let device = args
+            .get("device")
+            .map(|device| device.replace("%user%", user.as_str()));
+        let name = args
+            .get("name")
+            .map(|name| name.replace("%user%", user.as_str()));
+
+        let mut attempts = args
+            .get("attempts")
+            .and_then(|a| a.parse::<usize>().ok())
+            .unwrap_or(3);
+
+        if let (Some(device), Some(name)) = (device, name) {
+            if !Path::new(&device).exists() || Path::new(&format!("/dev/mapper/{}", name)).exists()
+            {
+                return Ok(());
+            }
+            // root required to mount luks
+            match sudo::check() {
+                RunningAs::User => return Err(Fido2LuksError::MissingPrivileges),
+                _ => {
+                    sudo::escalate_if_needed().map_err(|_| Fido2LuksError::MissingPrivileges)?;
+                }
+            }
+            let mut device = LuksDevice::load(device)?;
+            let mut additional_credentials: HashSet<String> = HashSet::new();
+            if device.is_luks2()? {
+                for token in device.tokens()? {
+                    let (_, token) = token?;
+                    additional_credentials.extend(token.credential.into_iter());
+                }
+            }
+            let credentials: Vec<FidoCredential> = credentials
+                .into_iter()
+                .chain(additional_credentials.into_iter())
+                .map(|cred| HexEncoded::from_str(cred.as_str()))
+                .map(|cred| FidoCredential {
+                    id: cred.unwrap().0,
+                    public_key: None,
+                })
+                .collect();
+            let credentials: Vec<&FidoCredential> = credentials.iter().collect();
+            if !credentials.is_empty() {
+                loop {
+                    let (pin, pass) = if pin_prefix {
+                        let password = password("PIN + FIDO2 salt (pin:password):")
+                            .map_err(|e| Fido2LuksError::AskPassError { cause: e.into() })?;
+                        let mut parts = password.split(":");
+                        (
+                            parts.next().map(|p| p.to_string()).or(pin.cloned()),
+                            parts.collect::<Vec<_>>().join(":"),
+                        )
+                    } else {
+                        (
+                            pin.cloned(),
+                            password("FIDO2 salt: ")
+                                .map_err(|e| Fido2LuksError::AskPassError { cause: e.into() })?,
+                        )
+                    };
+
+                    let salt = util::sha256(&[pass.as_bytes()]);
+                    let secret = util::sha256(&[
+                        &salt,
+                        &perform_challenge(
+                            &credentials[..],
+                            &salt,
+                            Duration::from_secs(15),
+                            pin.as_ref().map(String::as_str),
+                        )?
+                        .0[..],
+                    ]);
+                    match device.activate(name.as_str(), &secret[..], None) {
+                        Ok(_) => return Ok(()),
+                        _ if attempts > 0 => {
+                            attempts -= 1;
+                            continue;
+                        }
+                        Err(e) => break Err(e),
+                    }
+                }
+            } else {
+                Err(ConfigurationError::Missing(vec!["credentials".into()]).into())
+            }
+        } else {
+            Ok(())
+        }
+    }
+}
+
+impl PamServiceModule for PamFido2Luks {
+    fn authenticate(pamh: Pam, _flag: PamFlag, args: Vec<String>) -> PamError {
+        let perfrom_authenticate = move || -> Fido2LuksResult<()> {
+            let user = match pamh.get_cached_user() {
+                Err(e) => Err(AskPassError::Pam(e))?,
+                Ok(p) => p.map(|s| s.to_str().map(str::to_string).unwrap()),
+            };
+            let mut password = match pamh.get_authtok(None) {
+                Err(e) => Err(AskPassError::Pam(e))?,
+                Ok(p) => p.map(|s| s.to_str().map(str::to_string).unwrap()),
+            };
+            if let Some(user) = user {
+                PamFido2Luks.open(
+                    user,
+                    move |q: &str| match password.take() {
+                        Some(pass) => Ok(pass),
+                        None => pamh
+                            .conv(Some(q), PamMsgStyle::PROMPT_ECHO_OFF)
+                            .map(|s| s.map(|s| s.to_str().unwrap()).unwrap_or("").to_string()),
+                    },
+                    args,
+                )
+            } else {
+                Err(AskPassError::Pam(PamError::AUTH_ERR))?
+            }
+        };
+        match perfrom_authenticate() {
+            Ok(_) => PamError::SUCCESS,
+            Err(e) => {
+                eprintln!("{}", e);
+                PamError::AUTH_ERR
+            }
+        }
+    }
+}
+
+pam_module!(PamFido2Luks);