434 lines
15 KiB
Diff
434 lines
15 KiB
Diff
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From f63d93bc3d0ad73b24b2cf9c0ee0381161071395 Mon Sep 17 00:00:00 2001
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From: Luke Granger-Brown <git@lukegb.com>
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Date: Sun, 13 Mar 2022 17:20:16 +0000
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Subject: [PATCH 1/2] pam_ussh: init at unstable-20210615
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---
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pkgs/os-specific/linux/pam_ussh/default.nix | 64 +++++++++++++++++++++
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pkgs/os-specific/linux/pam_ussh/go.mod | 15 +++++
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pkgs/top-level/all-packages.nix | 2 +
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3 files changed, 81 insertions(+)
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create mode 100644 pkgs/os-specific/linux/pam_ussh/default.nix
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create mode 100644 pkgs/os-specific/linux/pam_ussh/go.mod
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diff --git a/pkgs/os-specific/linux/pam_ussh/default.nix b/pkgs/os-specific/linux/pam_ussh/default.nix
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new file mode 100644
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index 0000000000000..499239500acce
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--- /dev/null
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+++ b/pkgs/os-specific/linux/pam_ussh/default.nix
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@@ -0,0 +1,64 @@
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+{ buildGoModule
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+, fetchFromGitHub
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+, pam
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+, lib
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+}:
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+
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+buildGoModule rec {
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+ pname = "pam_ussh";
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+ version = "unstable-20210615";
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+
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+ src = fetchFromGitHub {
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+ owner = "uber";
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+ repo = "pam-ussh";
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+ rev = "e9524bda90ba19d3b9eb24f49cb63a6a56a19193"; # HEAD as of 2022-03-13
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+ sha256 = "0nb9hpqbghgi3zvq41kabydzyc6ffaaw9b4jkc5jrwn1klpw1xk8";
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+ };
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+
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+ prePatch = ''
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+ cp ${./go.mod} go.mod
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+ '';
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+ overrideModAttrs = (_: {
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+ inherit prePatch;
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+ });
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+
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+ vendorSha256 = "0hjifc3kbwmx7kjn858vi05cwwra6q19cqjfd94k726pwhk37qkw";
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+
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+ buildInputs = [
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+ pam
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+ ];
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+
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+ buildPhase = ''
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+ runHook preBuild
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+
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+ if [ -z "$enableParallelBuilding" ]; then
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+ export NIX_BUILD_CORES=1
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+ fi
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+ go build -buildmode=c-shared -o pam_ussh.so -v -p $NIX_BUILD_CORES .
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+
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+ runHook postBuild
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+ '';
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+ checkPhase = ''
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+ runHook preCheck
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+
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+ go test -v -p $NIX_BUILD_CORES .
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+
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+ runHook postCheck
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+ '';
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+ installPhase = ''
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+ runHook preInstall
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+
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+ mkdir -p $out/lib/security
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+ cp pam_ussh.so $out/lib/security
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+
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+ runHook postInstall
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+ '';
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+
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+ meta = with lib; {
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+ homepage = "https://github.com/uber/pam-ussh";
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+ description = "PAM module to authenticate using SSH certificates";
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+ license = licenses.mit;
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+ platforms = platforms.linux;
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+ maintainers = with maintainers; [ lukegb ];
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+ };
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+}
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diff --git a/pkgs/os-specific/linux/pam_ussh/go.mod b/pkgs/os-specific/linux/pam_ussh/go.mod
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new file mode 100644
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index 0000000000000..9adc453560a43
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--- /dev/null
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+++ b/pkgs/os-specific/linux/pam_ussh/go.mod
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@@ -0,0 +1,15 @@
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+module github.com/uber/pam-ussh
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+
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+go 1.17
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+
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+require (
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+ github.com/stretchr/testify v1.7.0
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+ golang.org/x/crypto v0.0.0-20220313003712-b769efc7c000
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+)
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+
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+require (
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+ github.com/davecgh/go-spew v1.1.0 // indirect
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+ github.com/pmezard/go-difflib v1.0.0 // indirect
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+ golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
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+ gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
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+)
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diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
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index 6c6832ae05475..539ecd4ec481b 100644
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--- a/pkgs/top-level/all-packages.nix
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+++ b/pkgs/top-level/all-packages.nix
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@@ -23052,6 +23052,8 @@ with pkgs;
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pam_usb = callPackage ../os-specific/linux/pam_usb { };
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+ pam_ussh = callPackage ../os-specific/linux/pam_ussh { };
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+
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paxctl = callPackage ../os-specific/linux/paxctl { };
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paxtest = callPackage ../os-specific/linux/paxtest { };
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From 1853015550a78acbc3e9d090d174120796c4b784 Mon Sep 17 00:00:00 2001
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From: Luke Granger-Brown <git@lukegb.com>
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Date: Sun, 13 Mar 2022 17:20:23 +0000
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Subject: [PATCH 2/2] nixos/pam: add support for pam-ussh
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pam-ussh allows authorizing using an SSH certificate stored in your
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SSH agent, in a similar manner to pam-ssh-agent-auth, but for
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certificates rather than raw public keys.
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---
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.../from_md/release-notes/rl-2205.section.xml | 9 ++
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.../manual/release-notes/rl-2205.section.md | 2 +
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nixos/modules/security/pam.nix | 109 ++++++++++++++++++
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nixos/modules/security/sudo.nix | 2 +-
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nixos/tests/all-tests.nix | 1 +
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nixos/tests/pam/pam-ussh.nix | 70 +++++++++++
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pkgs/os-specific/linux/pam_ussh/default.nix | 3 +
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7 files changed, 195 insertions(+), 1 deletion(-)
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create mode 100644 nixos/tests/pam/pam-ussh.nix
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diff --git a/nixos/doc/manual/from_md/release-notes/rl-2205.section.xml b/nixos/doc/manual/from_md/release-notes/rl-2205.section.xml
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index 9cf27e56827a1..ede0e10e03466 100644
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--- a/nixos/doc/manual/from_md/release-notes/rl-2205.section.xml
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+++ b/nixos/doc/manual/from_md/release-notes/rl-2205.section.xml
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@@ -1286,6 +1286,15 @@
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been added by default.
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</para>
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</listitem>
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+ <listitem>
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+ <para>
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+ <literal>security.pam.ussh</literal> has been added, which
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+ allows authorizing PAM sessions based on SSH
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+ <emphasis>certificates</emphasis> held within an SSH agent,
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+ using
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+ <link xlink:href="https://github.com/uber/pam-ussh">pam-ussh</link>.
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+ </para>
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+ </listitem>
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<listitem>
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<para>
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The <literal>zrepl</literal> package has been updated from
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diff --git a/nixos/doc/manual/release-notes/rl-2205.section.md b/nixos/doc/manual/release-notes/rl-2205.section.md
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index 58a1b23d17bf6..90ac7e90e7295 100644
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--- a/nixos/doc/manual/release-notes/rl-2205.section.md
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+++ b/nixos/doc/manual/release-notes/rl-2205.section.md
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@@ -470,6 +470,8 @@ In addition to numerous new and upgraded packages, this release has the followin
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- `services.logrotate.enable` now defaults to true if any rotate path has
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been defined, and some paths have been added by default.
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+- `security.pam.ussh` has been added, which allows authorizing PAM sessions based on SSH _certificates_ held within an SSH agent, using [pam-ussh](https://github.com/uber/pam-ussh).
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+
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- The `zrepl` package has been updated from 0.4.0 to 0.5:
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- The RPC protocol version was bumped; all zrepl daemons in a setup must be updated and restarted before replication can resume.
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diff --git a/nixos/modules/security/pam.nix b/nixos/modules/security/pam.nix
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index c0ef8b5f30bd4..f9697d61f1b27 100644
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--- a/nixos/modules/security/pam.nix
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+++ b/nixos/modules/security/pam.nix
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@@ -61,6 +61,19 @@ let
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'';
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};
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+ usshAuth = mkOption {
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+ default = false;
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+ type = types.bool;
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+ description = ''
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+ If set, users with an SSH certificate containing an authorized principal
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+ in their SSH agent are able to log in. Specific options are controlled
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+ using the <option>security.pam.ussh</option> options.
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+
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+ Note that the <option>security.pam.ussh.enable</option> must also be
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+ set for this option to take effect.
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+ '';
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+ };
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+
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yubicoAuth = mkOption {
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default = config.security.pam.yubico.enable;
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defaultText = literalExpression "config.security.pam.yubico.enable";
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@@ -475,6 +488,9 @@ let
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optionalString cfg.usbAuth ''
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auth sufficient ${pkgs.pam_usb}/lib/security/pam_usb.so
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'' +
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+ (let ussh = config.security.pam.ussh; in optionalString (config.security.pam.ussh.enable && cfg.usshAuth) ''
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+ auth ${ussh.control} ${pkgs.pam_ussh}/lib/security/pam_ussh.so ${optionalString (ussh.caFile != null) "ca_file=${ussh.caFile}"} ${optionalString (ussh.authorizedPrincipals != null) "authorized_principals=${ussh.authorizedPrincipals}"} ${optionalString (ussh.authorizedPrincipalsFile != null) "authorized_principals_file=${ussh.authorizedPrincipalsFile}"} ${optionalString (ussh.group != null) "group=${ussh.group}"}
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+ '') +
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(let oath = config.security.pam.oath; in optionalString cfg.oathAuth ''
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auth requisite ${pkgs.oathToolkit}/lib/security/pam_oath.so window=${toString oath.window} usersfile=${toString oath.usersFile} digits=${toString oath.digits}
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'') +
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@@ -926,6 +942,96 @@ in
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};
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};
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+ security.pam.ussh = {
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+ enable = mkOption {
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+ default = false;
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+ type = types.bool;
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+ description = ''
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+ Enables Uber's USSH PAM (<literal>pam-ussh</literal>) module.
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+
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+ This is similar to <literal>pam-ssh-agent</literal>, except that
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+ the presence of a CA-signed SSH key with a valid principal is checked
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+ instead.
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+
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+ Note that this module must both be enabled using this option and on a
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+ per-PAM-service level as well (using <literal>usshAuth</literal>).
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+
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+ More information can be found <link
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+ xlink:href="https://github.com/uber/pam-ussh">here</link>.
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+ '';
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+ };
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+
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+ caFile = mkOption {
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+ default = null;
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+ type = with types; nullOr path;
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+ description = ''
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+ By default <literal>pam-ussh</literal> reads the trusted user CA keys
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+ from <filename>/etc/ssh/trusted_user_ca</filename>.
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+
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+ This should be set the same as your <literal>TrustedUserCAKeys</literal>
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+ option for sshd.
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+ '';
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+ };
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+
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+ authorizedPrincipals = mkOption {
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+ default = null;
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+ type = with types; nullOr commas;
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+ description = ''
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+ Comma-separated list of authorized principals to permit; if the user
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+ presents a certificate with one of these principals, then they will be
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+ authorized.
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+
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+ Note that <literal>pam-ussh</literal> also requires that the certificate
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+ contain a principal matching the user's username. The principals from
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+ this list are in addition to those principals.
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+
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+ Mutually exclusive with <literal>authorizedPrincipalsFile</literal>.
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+ '';
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+ };
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+
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+ authorizedPrincipalsFile = mkOption {
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+ default = null;
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+ type = with types; nullOr path;
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+ description = ''
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+ Path to a list of principals; if the user presents a certificate with
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+ one of these principals, then they will be authorized.
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+
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+ Note that <literal>pam-ussh</literal> also requires that the certificate
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+ contain a principal matching the user's username. The principals from
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+ this file are in addition to those principals.
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+
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+ Mutually exclusive with <literal>authorizedPrincipals</literal>.
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+ '';
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+ };
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+
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+ group = mkOption {
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+ default = null;
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+ type = with types; nullOr str;
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+ description = ''
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+ If set, then the authenticating user must be a member of this group
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+ to use this module.
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+ '';
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+ };
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+
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+ control = mkOption {
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+ default = "sufficient";
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+ type = types.enum [ "required" "requisite" "sufficient" "optional" ];
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+ description = ''
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+ This option sets pam "control".
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+ If you want to have multi factor authentication, use "required".
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+ If you want to use the SSH certificate instead of the regular password,
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+ use "sufficient".
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+
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+ Read
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+ <citerefentry>
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+ <refentrytitle>pam.conf</refentrytitle>
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+ <manvolnum>5</manvolnum>
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+ </citerefentry>
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+ for better understanding of this option.
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+ '';
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+ };
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+ };
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+
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security.pam.yubico = {
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enable = mkOption {
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default = false;
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@@ -1110,6 +1216,9 @@ in
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optionalString (isEnabled (cfg: cfg.usbAuth)) ''
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mr ${pkgs.pam_usb}/lib/security/pam_usb.so,
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'' +
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+ optionalString (isEnabled (cfg: cfg.usshAuth)) ''
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+ mr ${pkgs.pam_ussh}/lib/security/pam_ussh.so,
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+ '' +
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optionalString (isEnabled (cfg: cfg.oathAuth)) ''
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"mr ${pkgs.oathToolkit}/lib/security/pam_oath.so,
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'' +
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diff --git a/nixos/modules/security/sudo.nix b/nixos/modules/security/sudo.nix
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index 99e578f8adae6..4bf239fca8f90 100644
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--- a/nixos/modules/security/sudo.nix
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+++ b/nixos/modules/security/sudo.nix
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@@ -245,7 +245,7 @@ in
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environment.systemPackages = [ sudo ];
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- security.pam.services.sudo = { sshAgentAuth = true; };
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+ security.pam.services.sudo = { sshAgentAuth = true; usshAuth = true; };
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environment.etc.sudoers =
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{ source =
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diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
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index 043d8a56d0c63..1ed12c54c5752 100644
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--- a/nixos/tests/all-tests.nix
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+++ b/nixos/tests/all-tests.nix
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@@ -388,6 +388,7 @@ in
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pam-file-contents = handleTest ./pam/pam-file-contents.nix {};
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pam-oath-login = handleTest ./pam/pam-oath-login.nix {};
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pam-u2f = handleTest ./pam/pam-u2f.nix {};
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+ pam-ussh = handleTest ./pam/pam-ussh.nix {};
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pantalaimon = handleTest ./matrix/pantalaimon.nix {};
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pantheon = handleTest ./pantheon.nix {};
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paperless-ng = handleTest ./paperless-ng.nix {};
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diff --git a/nixos/tests/pam/pam-ussh.nix b/nixos/tests/pam/pam-ussh.nix
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new file mode 100644
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index 0000000000000..ba0570dbf97d2
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--- /dev/null
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+++ b/nixos/tests/pam/pam-ussh.nix
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@@ -0,0 +1,70 @@
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+import ../make-test-python.nix ({ pkgs, lib, ... }:
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+
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+let
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+ testOnlySSHCredentials = pkgs.runCommand "pam-ussh-test-ca" {
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+ nativeBuildInputs = [ pkgs.openssh ];
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+ } ''
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+ mkdir $out
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+ ssh-keygen -t ed25519 -N "" -f $out/ca
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+
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+ ssh-keygen -t ed25519 -N "" -f $out/alice
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+ ssh-keygen -s $out/ca -I "alice user key" -n "alice,root" -V 19700101:forever $out/alice.pub
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+
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+ ssh-keygen -t ed25519 -N "" -f $out/bob
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+ ssh-keygen -s $out/ca -I "bob user key" -n "bob" -V 19700101:forever $out/bob.pub
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+ '';
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+ makeTestScript = user: pkgs.writeShellScript "pam-ussh-${user}-test-script" ''
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+ set -euo pipefail
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+
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+ eval $(${pkgs.openssh}/bin/ssh-agent)
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+
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+ mkdir -p $HOME/.ssh
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|
+ chmod 700 $HOME/.ssh
|
||
|
+ cp ${testOnlySSHCredentials}/${user}{,.pub,-cert.pub} $HOME/.ssh
|
||
|
+ chmod 600 $HOME/.ssh/${user}
|
||
|
+ chmod 644 $HOME/.ssh/${user}{,-cert}.pub
|
||
|
+
|
||
|
+ set -x
|
||
|
+
|
||
|
+ ${pkgs.openssh}/bin/ssh-add $HOME/.ssh/${user}
|
||
|
+ ${pkgs.openssh}/bin/ssh-add -l &>2
|
||
|
+
|
||
|
+ exec sudo id -u -n
|
||
|
+ '';
|
||
|
+in {
|
||
|
+ name = "pam-ussh";
|
||
|
+ meta.maintainers = with lib.maintainers; [ lukegb ];
|
||
|
+
|
||
|
+ machine =
|
||
|
+ { ... }:
|
||
|
+ {
|
||
|
+ users.users.alice = { isNormalUser = true; extraGroups = [ "wheel" ]; };
|
||
|
+ users.users.bob = { isNormalUser = true; extraGroups = [ "wheel" ]; };
|
||
|
+
|
||
|
+ security.pam.ussh = {
|
||
|
+ enable = true;
|
||
|
+ authorizedPrincipals = "root";
|
||
|
+ caFile = "${testOnlySSHCredentials}/ca.pub";
|
||
|
+ };
|
||
|
+
|
||
|
+ security.sudo = {
|
||
|
+ enable = true;
|
||
|
+ extraConfig = ''
|
||
|
+ Defaults lecture="never"
|
||
|
+ '';
|
||
|
+ };
|
||
|
+ };
|
||
|
+
|
||
|
+ testScript =
|
||
|
+ ''
|
||
|
+ with subtest("alice should be allowed to escalate to root"):
|
||
|
+ machine.succeed(
|
||
|
+ 'su -c "${makeTestScript "alice"}" -l alice | grep root'
|
||
|
+ )
|
||
|
+
|
||
|
+ with subtest("bob should not be allowed to escalate to root"):
|
||
|
+ machine.fail(
|
||
|
+ 'su -c "${makeTestScript "bob"}" -l bob | grep root'
|
||
|
+ )
|
||
|
+ '';
|
||
|
+})
|
||
|
diff --git a/pkgs/os-specific/linux/pam_ussh/default.nix b/pkgs/os-specific/linux/pam_ussh/default.nix
|
||
|
index 499239500acce..889c8bc6f57cf 100644
|
||
|
--- a/pkgs/os-specific/linux/pam_ussh/default.nix
|
||
|
+++ b/pkgs/os-specific/linux/pam_ussh/default.nix
|
||
|
@@ -2,6 +2,7 @@
|
||
|
, fetchFromGitHub
|
||
|
, pam
|
||
|
, lib
|
||
|
+, nixosTests
|
||
|
}:
|
||
|
|
||
|
buildGoModule rec {
|
||
|
@@ -54,6 +55,8 @@ buildGoModule rec {
|
||
|
runHook postInstall
|
||
|
'';
|
||
|
|
||
|
+ passthru.tests = { inherit (nixosTests) pam-ussh; };
|
||
|
+
|
||
|
meta = with lib; {
|
||
|
homepage = "https://github.com/uber/pam-ussh";
|
||
|
description = "PAM module to authenticate using SSH certificates";
|