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10 Commits

Author SHA1 Message Date
210da1ce0f
added --allow-discards flag 2021-12-28 13:35:34 +01:00
4509cacd6d
update deps 2021-12-28 13:32:29 +01:00
cbachert
67136f2405
Add Ubuntu fallback to passphrase, add defaults (#35)
Co-authored-by: cbachert <1316659-cbachert@users.noreply.gitlab.com>
2021-09-11 16:33:14 +02:00
b2e4950db5
update ctap_hmac 2021-07-26 18:46:10 +02:00
5496c4e61b
always set credential name 2021-07-14 15:47:23 +02:00
51fa26b7d5
bump version 2021-07-14 12:24:58 +02:00
Vyacheslav Konovalov
a3696962e8
Support for initcpio (#31)
* Add initcpio hook and install script

* Make PIN optional

* Add README for initcpio

* Fix PKGBUILD, add install of initcpio

* Fix README for initcpio
2021-07-14 12:23:32 +02:00
shimunn
7e6b33ae7f
Theory of operation (#30)
All checks were successful
continuous-integration/drone/push Build is passing
2021-02-28 12:56:57 +01:00
b3495c45f3
add nix flake 2021-02-08 16:06:56 +01:00
shimunn
17ca487b85
Obvious password promt (#29)
* obvious password promt

* prompt interaction with FIDO device
2021-02-08 15:58:41 +01:00
17 changed files with 682 additions and 222 deletions

4
.gitignore vendored
View File

@ -5,4 +5,6 @@
fido2luks.bash
fido2luks.elv
fido2luks.fish
fido2luks.zsh
fido2luks.zsh
result
result-*

459
Cargo.lock generated
View File

@ -2,33 +2,33 @@
# It is not intended for manual editing.
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checksum = "4d7559a8a40d0f97e1edea3220f698f78b1c5ab67532e49f68fde3910323b722"
checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
[[package]]
name = "miniz_oxide"
version = "0.4.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a92518e98c078586bc6c934028adcca4c92a53d6a958196de835170a01d84e4b"
dependencies = [
"adler",
"autocfg 1.0.1",
]
[[package]]
name = "nom"
version = "5.1.2"
version = "7.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ffb4262d26ed83a1c0a33a38fe2bb15797329c85770da05e6b828ddb782627af"
checksum = "1b1d11e1ef389c76fe5b81bcaf2ea32cf88b62bc494e19f493d0b30e7a930109"
dependencies = [
"memchr",
"minimal-lexical",
"version_check",
]
@ -583,18 +638,21 @@ dependencies = [
[[package]]
name = "num-traits"
version = "0.2.12"
version = "0.2.14"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ac267bcc07f48ee5f8935ab0d24f316fb722d7a1292e2913f0cc196b29ffd611"
checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
dependencies = [
"autocfg 1.0.1",
]
[[package]]
name = "object"
version = "0.20.0"
version = "0.27.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1ab52be62400ca80aa00285d25253d7f7c437b7375c4de678f5405d3afe82ca5"
checksum = "67ac1d3f9a1d3616fd9a60c8d74296f22406a238b6a72f5cc1e6f314df4ffbf9"
dependencies = [
"memchr",
]
[[package]]
name = "peeking_take_while"
@ -603,10 +661,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "19b17cddbe7ec3f8bc800887bab5e717348c95ea2ca0b1bf0837fb964dc67099"
[[package]]
name = "pkg-config"
version = "0.3.18"
name = "pest"
version = "2.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d36492546b6af1463394d46f0c834346f31548646f6ba10849802c9c9a27ac33"
checksum = "10f4872ae94d7b90ae48754df22fd42ad52ce740b8f370b03da4835417403e53"
dependencies = [
"ucd-trie",
]
[[package]]
name = "pkg-config"
version = "0.3.24"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "58893f751c9b0412871a09abd62ecd2a00298c6c83befa223ef98c52aef40cbe"
[[package]]
name = "proc-macro-error"
@ -615,9 +682,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
dependencies = [
"proc-macro-error-attr",
"proc-macro2 1.0.20",
"quote 1.0.7",
"syn 1.0.40",
"proc-macro2 1.0.36",
"quote 1.0.14",
"syn 1.0.84",
"version_check",
]
@ -627,8 +694,8 @@ version = "1.0.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
dependencies = [
"proc-macro2 1.0.20",
"quote 1.0.7",
"proc-macro2 1.0.36",
"quote 1.0.14",
"version_check",
]
@ -643,19 +710,13 @@ dependencies = [
[[package]]
name = "proc-macro2"
version = "1.0.20"
version = "1.0.36"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "175c513d55719db99da20232b06cda8bab6b83ec2d04e3283edf0213c37c1a29"
checksum = "c7342d5883fbccae1cc37a2353b09c87c9b0f3afd73f5fb9bba687a1f733b029"
dependencies = [
"unicode-xid 0.2.1",
"unicode-xid 0.2.2",
]
[[package]]
name = "quick-error"
version = "1.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
[[package]]
name = "quote"
version = "0.6.13"
@ -667,11 +728,11 @@ dependencies = [
[[package]]
name = "quote"
version = "1.0.7"
version = "1.0.14"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
checksum = "47aa80447ce4daf1717500037052af176af5d38cc3e571d9ec1c7353fc10c87d"
dependencies = [
"proc-macro2 1.0.20",
"proc-macro2 1.0.36",
]
[[package]]
@ -814,21 +875,26 @@ dependencies = [
[[package]]
name = "regex"
version = "1.3.9"
version = "1.5.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9c3780fcf44b193bc4d09f36d2a3c87b251da4a046c87795a0d35f4f927ad8e6"
checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
dependencies = [
"aho-corasick",
"memchr",
"regex-syntax",
"thread_local",
]
[[package]]
name = "regex-syntax"
version = "0.6.18"
name = "regex-automata"
version = "0.1.10"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "26412eb97c6b088a6997e05f69403a802a92d520de2f8e63c2b65f9e0f47c4e8"
checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
[[package]]
name = "regex-syntax"
version = "0.6.25"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
[[package]]
name = "ring"
@ -867,9 +933,9 @@ dependencies = [
[[package]]
name = "rustc-demangle"
version = "0.1.16"
version = "0.1.21"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4c691c0e608126e00913e33f0ccf3727d5fc84573623b8d65b2df340b5201783"
checksum = "7ef03e0a2b150c7a90d01faf6254c9c48a41e95fb2a8c2ac1c6f0d2b9aefc342"
[[package]]
name = "rustc-hash"
@ -885,9 +951,9 @@ checksum = "dcf128d1287d2ea9d80910b5f1120d0b8eede3fbf1abe91c40d39ea7d51e6fda"
[[package]]
name = "ryu"
version = "1.0.5"
version = "1.0.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "71d301d4193d031abdd79ff7e3dd721168a9572ef3fe51a1517aba235bd8f86e"
checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"
[[package]]
name = "scopeguard"
@ -897,52 +963,61 @@ checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
[[package]]
name = "semver"
version = "0.9.0"
version = "0.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
checksum = "f301af10236f6df4160f7c3f04eec6dbc70ace82d23326abad5edee88801c6b6"
dependencies = [
"semver-parser",
]
[[package]]
name = "semver-parser"
version = "0.7.0"
name = "semver"
version = "1.0.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
checksum = "568a8e6258aa33c13358f81fd834adb854c6f7c9468520910a9b1e8fac068012"
[[package]]
name = "semver-parser"
version = "0.10.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "00b0bef5b7f9e0df16536d3961cfb6e84331c065b4066afb39768d0e319411f7"
dependencies = [
"pest",
]
[[package]]
name = "serde"
version = "1.0.115"
version = "1.0.132"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e54c9a88f2da7238af84b5101443f0c0d0a3bbdc455e34a5c9497b1903ed55d5"
checksum = "8b9875c23cf305cd1fd7eb77234cbb705f21ea6a72c637a5c6db5fe4b8e7f008"
[[package]]
name = "serde_derive"
version = "1.0.115"
version = "1.0.132"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "609feed1d0a73cc36a0182a840a9b37b4a82f0b1150369f0536a9e3f2a31dc48"
checksum = "ecc0db5cb2556c0e558887d9bbdcf6ac4471e83ff66cf696e5419024d1606276"
dependencies = [
"proc-macro2 1.0.20",
"quote 1.0.7",
"syn 1.0.40",
"proc-macro2 1.0.36",
"quote 1.0.14",
"syn 1.0.84",
]
[[package]]
name = "serde_json"
version = "1.0.57"
version = "1.0.73"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "164eacbdb13512ec2745fb09d51fd5b22b0d65ed294a1dcf7285a360c80a675c"
checksum = "bcbd0344bc6533bc7ec56df11d42fb70f1b912351c0825ccb7211b59d8af7cf5"
dependencies = [
"itoa",
"itoa 1.0.1",
"ryu",
"serde",
]
[[package]]
name = "shlex"
version = "0.1.1"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
checksum = "43b2853a4d09f215c24cc5489c992ce46052d359b5109343cbafbf26bc62f8a3"
[[package]]
name = "strsim"
@ -958,9 +1033,9 @@ checksum = "6446ced80d6c486436db5c078dde11a9f73d42b57fb273121e160b84f63d894c"
[[package]]
name = "structopt"
version = "0.3.17"
version = "0.3.25"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6cc388d94ffabf39b5ed5fadddc40147cb21e605f53db6f8f36a625d27489ac5"
checksum = "40b9788f4202aa75c240ecc9c15c65185e6a39ccdeb0fd5d008b98825464c87c"
dependencies = [
"clap",
"lazy_static",
@ -969,15 +1044,15 @@ dependencies = [
[[package]]
name = "structopt-derive"
version = "0.4.10"
version = "0.4.18"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5e2513111825077552a6751dfad9e11ce0fba07d7276a3943a037d7e93e64c5f"
checksum = "dcb5ae327f9cc13b68763b5749770cb9e048a99bd9dfdfa58d0cf05d5f64afe0"
dependencies = [
"heck",
"proc-macro-error",
"proc-macro2 1.0.20",
"quote 1.0.7",
"syn 1.0.40",
"proc-macro2 1.0.36",
"quote 1.0.14",
"syn 1.0.84",
]
[[package]]
@ -993,32 +1068,32 @@ dependencies = [
[[package]]
name = "syn"
version = "1.0.40"
version = "1.0.84"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "963f7d3cc59b59b9325165add223142bbf1df27655d07789f109896d353d8350"
checksum = "ecb2e6da8ee5eb9a61068762a32fa9619cc591ceb055b3687f4cd4051ec2e06b"
dependencies = [
"proc-macro2 1.0.20",
"quote 1.0.7",
"unicode-xid 0.2.1",
"proc-macro2 1.0.36",
"quote 1.0.14",
"unicode-xid 0.2.2",
]
[[package]]
name = "synstructure"
version = "0.12.4"
version = "0.12.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b834f2d66f734cb897113e34aaff2f1ab4719ca946f9a7358dba8f8064148701"
checksum = "f36bdaa60a83aca3921b5259d5400cbf5e90fc51931376a9bd4a0eb79aa7210f"
dependencies = [
"proc-macro2 1.0.20",
"quote 1.0.7",
"syn 1.0.40",
"unicode-xid 0.2.1",
"proc-macro2 1.0.36",
"quote 1.0.14",
"syn 1.0.84",
"unicode-xid 0.2.2",
]
[[package]]
name = "termcolor"
version = "1.1.0"
version = "1.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
checksum = "2dfed899f0eb03f32ee8c6a0aabdb8a7949659e3466561fc0adf54e26d88c5f4"
dependencies = [
"winapi-util",
]
@ -1032,37 +1107,33 @@ dependencies = [
"unicode-width",
]
[[package]]
name = "thread_local"
version = "1.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
dependencies = [
"lazy_static",
]
[[package]]
name = "time"
version = "0.1.44"
version = "0.1.43"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6db9e6914ab8b1ae1c260a4ae7a49b6c5611b40328a735b21862567685e73255"
checksum = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
dependencies = [
"libc",
"wasi",
"winapi",
]
[[package]]
name = "unicode-segmentation"
version = "1.6.0"
name = "ucd-trie"
version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
[[package]]
name = "unicode-segmentation"
version = "1.8.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
[[package]]
name = "unicode-width"
version = "0.1.8"
version = "0.1.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
[[package]]
name = "unicode-xid"
@ -1072,9 +1143,9 @@ checksum = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
[[package]]
name = "unicode-xid"
version = "0.2.1"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
[[package]]
name = "untrusted"
@ -1084,11 +1155,11 @@ checksum = "55cd1f4b4e96b46aeb8d4855db4a7a9bd96eeeb5c6a1ab54593328761642ce2f"
[[package]]
name = "uuid"
version = "0.7.4"
version = "0.8.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "90dbc611eb48397705a6b0f6e917da23ae517e4d127123d2cf7674206627d32a"
checksum = "bc5cf98d8186244414c848017f0e2676b3fcb46807f6668a97dfe67359a3c4b7"
dependencies = [
"rand 0.6.5",
"getrandom",
]
[[package]]
@ -1099,22 +1170,24 @@ checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
[[package]]
name = "version_check"
version = "0.9.2"
version = "0.9.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"
[[package]]
name = "wasi"
version = "0.10.0+wasi-snapshot-preview1"
version = "0.10.2+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
[[package]]
name = "which"
version = "3.1.1"
version = "4.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d011071ae14a2f6671d0b74080ae0cd8ebf3a6f8c9589a2cd45f23126fe29724"
checksum = "ea187a8ef279bc014ec368c27a920da2024d2a711109bfbe3440585d5cf27ad9"
dependencies = [
"either",
"lazy_static",
"libc",
]

View File

@ -1,6 +1,6 @@
[package]
name = "fido2luks"
version = "0.2.16"
version = "0.2.20"
authors = ["shimunn <shimun@shimun.net>"]
edition = "2018"
@ -14,7 +14,7 @@ categories = ["command-line-utilities"]
license = "MPL-2.0"
[dependencies]
ctap_hmac = { version="0.4.2", features = ["request_multiple"] }
ctap_hmac = { version="0.4.5", features = ["request_multiple"] }
hex = "0.3.2"
ring = "0.13.5"
failure = "0.1.5"
@ -26,7 +26,7 @@ serde_derive = "1.0.106"
serde = "1.0.106"
[build-dependencies]
ctap_hmac = { version="0.4.2", features = ["request_multiple"] }
ctap_hmac = { version="0.4.5", features = ["request_multiple"] }
hex = "0.3.2"
ring = "0.13.5"
failure = "0.1.5"

View File

@ -1,26 +1,37 @@
# Maintainer: shimunn <shimun@shimun.net>
pkgname=fido2luks
pkgver=0.2.12
pkgname=fido2luks-git
pkgver=0.2.16.7e6b33a
pkgrel=1
makedepends=('rust' 'cargo' 'cryptsetup' 'clang')
makedepends=('rust' 'cargo' 'cryptsetup' 'clang' 'git')
depends=('cryptsetup')
arch=('i686' 'x86_64' 'armv6h' 'armv7h')
pkgdesc="Decrypt your LUKS partition using a FIDO2 compatible authenticator"
url="https://github.com/shimunn/fido2luks"
license=('MPL-2.0')
source=('git+https://github.com/shimunn/fido2luks')
sha512sums=('SKIP')
pkgver() {
# Use tag version if possible otherwise concat project version and git ref
git describe --exact-match --tags HEAD 2> /dev/null || \
echo "$(cargo pkgid | cut -d'#' -f2).$(git describe --always)"
cd fido2luks
# Use tag version if possible otherwise concat project version and git ref
git describe --exact-match --tags HEAD 2>/dev/null ||
echo "$(cargo pkgid | cut -d'#' -f2).$(git describe --always)"
}
build() {
cd fido2luks
cargo build --release --locked --all-features --target-dir=target
}
package() {
install -Dm 755 target/release/${pkgname} -t "${pkgdir}/usr/bin"
install -Dm 755 ../pam_mount/fido2luksmounthelper.sh -t "${pkgdir}/usr/bin"
install -Dm 644 ../fido2luks.bash "${pkgdir}/usr/share/bash-completion/completions/fido2luks"
cd fido2luks
install -Dm 755 target/release/fido2luks -t "${pkgdir}/usr/bin"
install -Dm 755 pam_mount/fido2luksmounthelper.sh -t "${pkgdir}/usr/bin"
install -Dm 644 initcpio/hooks/fido2luks -t "${pkgdir}/usr/lib/initcpio/hooks"
install -Dm 644 initcpio/install/fido2luks -t "${pkgdir}/usr/lib/initcpio/install"
install -Dm 644 fido2luks.bash "${pkgdir}/usr/share/bash-completion/completions/fido2luks"
install -Dm 644 fido2luks.fish -t "${pkgdir}/usr/share/fish/vendor_completions.d"
}

View File

@ -115,6 +115,36 @@ sudo -E fido2luks -i replace-key /dev/disk/by-uuid/<DISK_UUID>
sudo rm -rf /usr/lib/dracut/modules.d/96luks-2fa /etc/dracut.conf.d/luks-2fa.conf /etc/fido2luks.conf
```
## Theory of operation
fido2luks builds on two basic building blocks, LUKS as an abstraction over linux disk encryption and and the FIDO2 extension [`hmac-secret`](https://fidoalliance.org/specs/fido-v2.0-rd-20180702/fido-client-to-authenticator-protocol-v2.0-rd-20180702.html#sctn-hmac-secret-extension).
The `hmac-secret` extension allows for an secret to be dervied on the FIDO2 device from two inputs, the user supplied salt/password/keyfile and another secret contained within the FID2 device. The output of the `hmac-secret` function will then be used to decrypt the LUKS header which in turn is used to decrypt the disk.
```
+-------------------------------------------------------------------------------+
| |
| +-----------------------------------------+ |
| | FIDO2 device | |
| | | |
| | | |
+-------+--------+ +------+ | +---------------+ | | +------------------------+
| Salt/Password +-> |sha256+------------------------> | | | v | LUKS header |
+----------------+ +------+ | | | | | | +---------------+
| | | | +--------+ +------------------------+--------> |Disk master key|
| | sha256_hmac +---------> | sha256 +-------> | Keyslot 1 | +---------------+
+----------------+ | +----------+ | | | +--------+ +------------------------+
| FIDO credential+---------------> |Credential| +----> | | | | Keyslot 2 |
+----------------+ | |secret | | | | +------------------------+
| +----------+ +---------------+ |
| |
| |
+-----------------------------------------+
```
Since all these components build upon each other losing or damaging just one of them will render the disk undecryptable, it's threfore of paramount importance to backup the LUKS header and ideally set an backup password
or utilise more than one FIDO2 device. Each additional credential and password combination will require it's own LUKS keyslot since the credential secret is randomly generated for each new credential and will thus result
in a completly different secret.
## License
Licensed under

62
flake.lock generated Normal file
View File

@ -0,0 +1,62 @@
{
"nodes": {
"naersk": {
"inputs": {
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1639947939,
"narHash": "sha256-pGsM8haJadVP80GFq4xhnSpNitYNQpaXk4cnA796Cso=",
"owner": "nmattia",
"repo": "naersk",
"rev": "2fc8ce9d3c025d59fee349c1f80be9785049d653",
"type": "github"
},
"original": {
"owner": "nmattia",
"repo": "naersk",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1638109994,
"narHash": "sha256-OpA37PTiPMIqoRJbufbl5rOLII7HeeGcA0yl7FoyCIE=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "a284564b7f75ac4db73607db02076e8da9d42c9d",
"type": "github"
},
"original": {
"id": "nixpkgs",
"type": "indirect"
}
},
"root": {
"inputs": {
"naersk": "naersk",
"nixpkgs": "nixpkgs",
"utils": "utils"
}
},
"utils": {
"locked": {
"lastModified": 1638122382,
"narHash": "sha256-sQzZzAbvKEqN9s0bzWuYmRaA03v40gaJ4+iL1LXjaeI=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "74f7e4319258e287b0f9cb95426c9853b282730b",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

61
flake.nix Normal file
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@ -0,0 +1,61 @@
{
description = "Decrypt your LUKS partition using a FIDO2 compatible authenticator";
inputs = {
utils.url = "github:numtide/flake-utils";
naersk = {
url = "github:nmattia/naersk";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs = { self, nixpkgs, utils, naersk }:
let
root = ./.;
pname = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.name;
forPkgs = pkgs:
let
naersk-lib = naersk.lib."${pkgs.system}";
buildInputs = with pkgs; [ cryptsetup ];
LIBCLANG_PATH = "${pkgs.clang.cc.lib}/lib";
nativeBuildInputs = with pkgs; [
pkgconfig
clang
];
in
rec {
# `nix build`
packages.${pname} = naersk-lib.buildPackage {
inherit pname root buildInputs nativeBuildInputs LIBCLANG_PATH;
};
defaultPackage = packages.${pname};
# `nix run`
apps.${pname} = utils.lib.mkApp {
drv = packages.${pname};
};
defaultApp = apps.${pname};
# `nix flake check`
checks = {
fmt = with pkgs; runCommandLocal "${pname}-fmt" { buildInputs = [ cargo rustfmt nixpkgs-fmt ]; } ''
cd ${root}
cargo fmt -- --check
nixpkgs-fmt --check *.nix
touch $out
'';
};
# `nix develop`
devShell = pkgs.mkShell {
nativeBuildInputs = with pkgs; [ rustc cargo rustfmt nixpkgs-fmt ] ++ nativeBuildInputs;
inherit buildInputs LIBCLANG_PATH;
};
};
forSystem = system: forPkgs nixpkgs.legacyPackages."${system}";
in
(utils.lib.eachSystem [ "aarch64-linux" "i686-linux" "x86_64-linux" ] forSystem) // {
overlay = final: prev: (forPkgs final).packages;
};
}

18
initcpio/Makefile Normal file
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@ -0,0 +1,18 @@
.PHONY: install remove
install:
install -Dm644 hooks/fido2luks -t /usr/lib/initcpio/hooks
install -Dm644 install/fido2luks -t /usr/lib/initcpio/install
ifdef preset
mkinitcpio -p $(preset)
else
mkinitcpio -P
endif
remove:
rm /usr/lib/initcpio/{hooks,install}/fido2luks
ifdef preset
mkinitcpio -p $(preset)
else
mkinitcpio -P
endif

52
initcpio/README.md Normal file
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@ -0,0 +1,52 @@
## fido2luks hook for mkinitcpio (ArchLinux and derivatives)
> ⚠️ Before proceeding, it is very advised to [backup your existing LUKS2 header](https://wiki.archlinux.org/title/dm-crypt/Device_encryption#Backup_using_cryptsetup) to external storage
### Setup
1. Connect your FIDO2 authenticator
2. Generate credential id
```shell
fido2luks credential
```
3. Generate salt (random string)
```shell
pwgen 48 1
```
4. Add key to your LUKS2 device
```shell
fido2luks add-key -Pt --salt <salt> <block_device> <credential_id>
```
`-P` - request PIN to unlock the authenticator
`-t` - add token (including credential id) to the LUKS2 header
`-e` - wipe all other keys
For the full list of options see `fido2luks add-key --help`
5. Edit [/etc/fido2luks.conf](/initcpio/fido2luks.conf)
Keyslot (`FIDO2LUKS_DEVICE_SLOT`) can be obtained from the output of
```shell
cryptsetup luksDump <block_device>
```
6. Add fido2luks hook to /etc/mkinitcpio.conf
Before or instead of `encrypt` hook, for example:
```shell
HOOKS=(base udev autodetect modconf keyboard block fido2luks filesystems fsck)
```
7. Recreate initial ramdisk
```shell
mkinitcpio -p <preset>
```

18
initcpio/fido2luks.conf Normal file
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@ -0,0 +1,18 @@
# Set credential *ONLY IF* it's not embedded in the LUKS2 header
FIDO2LUKS_CREDENTIAL_ID=
# Encrypted device and its name under /dev/mapper
# Can be overridden by `cryptdevice` kernel parameter
FIDO2LUKS_DEVICE=
FIDO2LUKS_MAPPER_NAME=
FIDO2LUKS_SALT=string:<salt>
# Use specific keyslot (ignore all other slots)
FIDO2LUKS_DEVICE_SLOT=
# Await for an authenticator to be connected (in seconds)
FIDO2LUKS_DEVICE_AWAIT=
# Set to 1 if PIN is required to unlock the authenticator
FIDO2LUKS_ASK_PIN=

55
initcpio/hooks/fido2luks Normal file
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@ -0,0 +1,55 @@
#!/usr/bin/ash
run_hook() {
modprobe -a -q dm-crypt >/dev/null 2>&1
. /etc/fido2luks.conf
if [ -z "$cryptdevice" ]; then
device="$FIDO2LUKS_DEVICE"
dmname="$FIDO2LUKS_MAPPER_NAME"
else
IFS=: read cryptdev dmname _cryptoptions <<EOF
$cryptdevice
EOF
if ! device=$(resolve_device "${cryptdev}" ${rootdelay}); then
return 1
fi
fi
options="--salt $FIDO2LUKS_SALT"
if [ "$FIDO2LUKS_ASK_PIN" == 1 ]; then
options="$options --pin"
fi
if [ -n "$FIDO2LUKS_DEVICE_SLOT" ]; then
options="$options --slot $FIDO2LUKS_DEVICE_SLOT"
fi
if [ -n "$FIDO2LUKS_DEVICE_AWAIT" ]; then
options="$options --await-dev $FIDO2LUKS_DEVICE_AWAIT"
fi
# HACK: /dev/tty is hardcoded in rpassword, but not accessible from the ramdisk
# Temporary link it to /dev/tty1
mv /dev/tty /dev/tty.back
ln -s /dev/tty1 /dev/tty
printf "\nAuthentication is required to access the $dmname volume at $device\n"
if [ -z "$FIDO2LUKS_CREDENTIAL_ID" ]; then
fido2luks open-token $device $dmname $options
else
fido2luks open $device $dmname $FIDO2LUKS_CREDENTIAL_ID $options
fi
exit_code=$?
# Restore /dev/tty
mv /dev/tty.back /dev/tty
if [ $exit_code -ne 0 ]; then
printf '\n'
read -s -p 'Press Enter to continue'
printf '\n'
fi
}

View File

@ -0,0 +1,31 @@
#!/bin/bash
build() {
local mod
add_module dm-crypt
add_module dm-integrity
if [[ $CRYPTO_MODULES ]]; then
for mod in $CRYPTO_MODULES; do
add_module "$mod"
done
else
add_all_modules /crypto/
fi
add_binary fido2luks
add_binary dmsetup
add_file /usr/lib/udev/rules.d/10-dm.rules
add_file /usr/lib/udev/rules.d/13-dm-disk.rules
add_file /usr/lib/udev/rules.d/95-dm-notify.rules
add_file /usr/lib/initcpio/udev/11-dm-initramfs.rules /usr/lib/udev/rules.d/11-dm-initramfs.rules
add_file /etc/fido2luks.conf /etc/fido2luks.conf
add_runscript
}
help() {
cat <<HELPEOF
This hook allows to decrypt LUKS2 partition using FIDO2 compatible authenticator
HELPEOF
}

View File

@ -1,3 +1,5 @@
FIDO2LUKS_SALT=Ask
#FIDO2LUKS_PASSWORD_HELPER="/usr/bin/plymouth ask-for-password --prompt 'FIDO2 password salt'"
FIDO2LUKS_CREDENTIAL_ID=
FIDO2LUKS_USE_TOKEN=0
FIDO2LUKS_PASSWORD_FALLBACK=1

View File

@ -2,6 +2,17 @@
set -a
. /etc/fido2luks.conf
# Set Defaults
if [ -z "$FIDO2LUKS_USE_TOKEN" ]; then
FIDO2LUKS_USE_TOKEN=0
fi
if [ -z "$FIDO2LUKS_PASSWORD_FALLBACK" ]; then
FIDO2LUKS_PASSWORD_FALLBACK=1
fi
if [ -z "$FIDO2LUKS_PASSWORD_HELPER" ]; then
MSG="FIDO2 password salt for $CRYPTTAB_NAME"
export FIDO2LUKS_PASSWORD_HELPER="plymouth ask-for-password --prompt '$MSG'"
@ -12,3 +23,8 @@ if [ "$FIDO2LUKS_USE_TOKEN" -eq 1 ]; then
fi
fido2luks print-secret --bin
# Fall back to passphrase-based unlock if fido2luks fails
if [ "$?" -gt 0 ] && [ "$FIDO2LUKS_PASSWORD_FALLBACK" -eq 1 ]; then
plymouth ask-for-password --prompt "Password for $CRYPTTAB_SOURCE"
fi

View File

@ -71,6 +71,12 @@ pub fn parse_cmdline() -> Args {
Args::from_args()
}
pub fn prompt_interaction(interactive: bool) {
if interactive {
println!("Authorize using your FIDO device");
}
}
pub fn run_cli() -> Fido2LuksResult<()> {
let mut stdout = io::stdout();
let args = parse_cmdline();
@ -87,7 +93,7 @@ pub fn run_cli() -> Fido2LuksResult<()> {
} else {
None
};
let cred = make_credential_id(name.as_ref().map(|n| n.as_ref()), pin)?;
let cred = make_credential_id(Some(name.as_ref()), pin)?;
println!("{}", hex::encode(&cred.id));
Ok(())
}
@ -109,6 +115,7 @@ pub fn run_cli() -> Fido2LuksResult<()> {
} else {
secret.salt.obtain_sha256(&secret.password_helper)
}?;
prompt_interaction(interactive);
let (secret, _cred) = derive_secret(
credentials.ids.0.as_slice(),
&salt,
@ -164,13 +171,16 @@ pub fn run_cli() -> Fido2LuksResult<()> {
} => Ok((util::read_keyfile(file)?, None)),
OtherSecret {
fido_device: true, ..
} => Ok(derive_secret(
&credentials.ids.0,
&salt(salt_q, verify)?,
authenticator.await_time,
pin.as_deref(),
)
.map(|(secret, cred)| (secret[..].to_vec(), Some(cred)))?),
} => {
prompt_interaction(interactive);
Ok(derive_secret(
&credentials.ids.0,
&salt(salt_q, verify)?,
authenticator.await_time,
pin.as_deref(),
)
.map(|(secret, cred)| (secret[..].to_vec(), Some(cred)))?)
}
_ => Ok((
util::read_password(salt_q, verify)?.as_bytes().to_vec(),
None,
@ -178,6 +188,7 @@ pub fn run_cli() -> Fido2LuksResult<()> {
}
};
let secret = |q: &str, verify: bool| -> Fido2LuksResult<([u8; 32], FidoCredential)> {
prompt_interaction(interactive);
derive_secret(
&credentials.ids.0,
&salt(q, verify)?,
@ -248,6 +259,7 @@ pub fn run_cli() -> Fido2LuksResult<()> {
secret,
name,
retries,
allow_discards,
..
}
| Command::OpenToken {
@ -256,6 +268,7 @@ pub fn run_cli() -> Fido2LuksResult<()> {
secret,
name,
retries,
allow_discards,
} => {
let pin_string;
let pin = if authenticator.pin {
@ -274,6 +287,7 @@ pub fn run_cli() -> Fido2LuksResult<()> {
// Cow shouldn't be necessary
let secret = |credentials: Cow<'_, Vec<HexEncoded>>| {
prompt_interaction(interactive);
derive_secret(
credentials.as_ref(),
&salt("Password", false)?,
@ -287,7 +301,9 @@ pub fn run_cli() -> Fido2LuksResult<()> {
loop {
let secret = match &args.command {
Command::Open { credentials, .. } => secret(Cow::Borrowed(&credentials.ids.0))
.and_then(|(secret, _cred)| luks_dev.activate(&name, &secret, luks.slot)),
.and_then(|(secret, _cred)| {
luks_dev.activate(&name, &secret, luks.slot, *allow_discards)
}),
Command::OpenToken { .. } => luks_dev.activate_token(
&name,
Box::new(|credentials: Vec<String>| {
@ -299,6 +315,7 @@ pub fn run_cli() -> Fido2LuksResult<()> {
.map(|(secret, cred)| (secret, hex::encode(&cred.id)))
}),
luks.slot,
*allow_discards,
),
_ => unreachable!(),
};

View File

@ -216,6 +216,9 @@ pub enum Command {
secret: SecretParameters,
#[structopt(short = "r", long = "max-retries", default_value = "0")]
retries: i32,
/// Pass SSD trim instructions to the underlying block device
#[structopt(long = "allow-discards")]
allow_discards: bool,
},
/// Open the LUKS device using credentials embedded in the LUKS 2 header
#[structopt(name = "open-token")]
@ -230,15 +233,18 @@ pub enum Command {
secret: SecretParameters,
#[structopt(short = "r", long = "max-retries", default_value = "0")]
retries: i32,
/// Pass SSD trim instructions to the underlying block device
#[structopt(long = "allow-discards")]
allow_discards: bool,
},
/// Generate a new FIDO credential
#[structopt(name = "credential")]
Credential {
#[structopt(flatten)]
authenticator: AuthenticatorParameters,
/// Name to be displayed on the authenticator if it has a display
#[structopt(env = "FIDO2LUKS_CREDENTIAL_NAME")]
name: Option<String>,
/// Name to be displayed on the authenticator display
#[structopt(env = "FIDO2LUKS_CREDENTIAL_NAME", default_value = "fido2luks")]
name: String,
},
/// Check if an authenticator is connected
#[structopt(name = "connected")]

View File

@ -1,8 +1,8 @@
use crate::error::*;
use libcryptsetup_rs::{
CryptActivateFlags, CryptDevice, CryptInit, CryptTokenInfo, EncryptionFormat, KeyslotInfo,
TokenInput,
CryptActivateFlag, CryptActivateFlags, CryptDevice, CryptInit, CryptTokenInfo,
EncryptionFormat, KeyslotInfo, TokenInput,
};
use std::collections::{HashMap, HashSet};
use std::path::Path;
@ -221,10 +221,15 @@ impl LuksDevice {
name: &str,
secret: &[u8],
slot_hint: Option<u32>,
allow_discard: bool,
) -> Fido2LuksResult<u32> {
let mut flags = CryptActivateFlags::empty();
if allow_discard {
flags = CryptActivateFlags::new(vec![CryptActivateFlag::AllowDiscards]);
}
self.device
.activate_handle()
.activate_by_passphrase(Some(name), slot_hint, secret, CryptActivateFlags::empty())
.activate_by_passphrase(Some(name), slot_hint, secret, flags)
.map_err(LuksError::activate)
}
@ -233,6 +238,7 @@ impl LuksDevice {
name: &str,
secret: impl Fn(Vec<String>) -> Fido2LuksResult<([u8; 32], String)>,
slot_hint: Option<u32>,
allow_discard: bool,
) -> Fido2LuksResult<u32> {
if !self.is_luks2()? {
return Err(LuksError::Luks2Required.into());
@ -276,7 +282,7 @@ impl LuksDevice {
.chain(std::iter::once(None).take(slots.is_empty() as usize)), // Try all slots as last resort
);
for slot in slots {
match self.activate(name, &secret, slot) {
match self.activate(name, &secret, slot, allow_discard) {
Err(Fido2LuksError::WrongSecret) => (),
res => return res,
}