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refactor: replace mkSGXContainer with sgxGramineContainer #55

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Aug 8, 2024
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13 changes: 13 additions & 0 deletions overlays/libTee/default.nix
Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
# SPDX-License-Identifier: Apache-2.0
# Copyright (c) 2024 Matter Labs
{ ... }:
final: prev:
{
nixsgxLib.mkSGXContainer = final.lib.warn "`nixsgxLib.mkSGXContainer` is deprecated, use `pkgs.lib.tee.sgxGramineContainer`" final.lib.tee.sgxGramineContainer;

lib = prev.lib.extend (libFinal: libPrev: {
tee = libPrev.tee or { } // {
sgxGramineContainer = args: final.callPackage ./sgxGramineContainer.nix args;
};
});
}
253 changes: 253 additions & 0 deletions overlays/libTee/sgxGramineContainer.nix
Original file line number Diff line number Diff line change
@@ -0,0 +1,253 @@
{ lib
, pkgs
, writeClosure
, coreutils
, curl
, nixsgx
, openssl
, packages
, rsync
, entrypoint
, name
, tag ? null
, keyfile ? ./test-enclave-key.pem
, isAzure ? false
, manifest ? { }
, sgx_default_qcnl_conf ? null
, extraCmd ? ":"
, extraPostBuild ? ""
, extraChrootCommands ? ""
, appDir ? "/app"
, appName ? "app"
, sigFile ? null
, extendedPackages ? [ ]
, customRecursiveMerge ? null
}:
assert lib.assertMsg (!(isAzure && sgx_default_qcnl_conf != null)) "sgx_default_qcnl_conf can't be set for Azure";
let
manifestRecursiveMerge =
base: mod: with lib.attrsets; let
mergeByPathWithOp = path: action: setAttrByPath path (
if hasAttrByPath path mod
then action (getAttrFromPath path base) (getAttrFromPath path mod)
else getAttrFromPath path base
);
mergeListByPath = path: mergeByPathWithOp path (a: b: a ++ b);
mergeEnvPathByPath = path: mergeByPathWithOp path (a: b: a + ":" + b);
in
recursiveUpdate base (recursiveUpdate mod (
# manually merge the relevant lists / strings
mergeListByPath [ "fs" "mounts" ]
// mergeListByPath [ "sgx" "trusted_files" ]
// mergeEnvPathByPath [ "loader" "env" "LD_LIBRARY_PATH" ]
));
manifest_base = {
libos = { inherit entrypoint; };
fs = {
mounts = [
{ path = "/var/tmp"; type = "tmpfs"; }
{ path = "/tmp"; type = "tmpfs"; }
{ path = "${appDir}/.dcap-qcnl"; type = "tmpfs"; }
{ path = "${appDir}/.az-dcap-client"; type = "tmpfs"; }
];
root = { uri = "file:/"; };
start_dir = "${appDir}";
};
loader = {
argv = [ entrypoint ];
entrypoint = "file:{{ gramine.libos }}";
env = {
AZDCAP_COLLATERAL_VERSION = "v4";
AZDCAP_DEBUG_LOG_LEVEL = "ignore";
HOME = "${appDir}";
LD_LIBRARY_PATH = (lib.makeLibraryPath [
(if isAzure then nixsgx.azure-dcap-client.out else nixsgx.sgx-dcap.default_qpl)
pkgs.curl.out
]) + ":{{ gramine.runtimedir() }}:/lib";
MALLOC_ARENA_MAX = "1";
PATH = "/bin";
SSL_CERT_FILE = "/etc/ssl/certs/ca-bundle.crt";
};
log_level = "error";
};
sgx = {
remote_attestation = "dcap";
trusted_files = [
"file:${appDir}/"
"file:/bin/"
"file:/etc/gai.conf"
"file:/etc/ssl/certs/ca-bundle.crt"
"file:/lib/"
"file:/nix/"
"file:{{ gramine.libos }}"
"file:{{ gramine.runtimedir() }}/"
] ++ (if !isAzure then [
"file:/etc/sgx_default_qcnl.conf"
] else [ ]);
};
sys = {
enable_extra_runtime_domain_names_conf = true;
enable_sigterm_injection = true;
};
};

mergedManifest = (if customRecursiveMerge == null then manifestRecursiveMerge else customRecursiveMerge) manifest_base manifest;

tomlFormat = pkgs.formats.toml { };
manifestFile = tomlFormat.generate "${name}.manifest.toml" mergedManifest;

contents = pkgs.buildEnv {
name = "image-root-${appName}";

paths = with pkgs.dockerTools; with nixsgx;[
openssl.out
curl.out
gramine
sgx-dcap.quote_verify
caCertificates
]
++ (if isAzure then [
azure-dcap-client
] else [
sgx-dcap.default_qpl
])
++ packages;

pathsToLink = [ "/bin" "/lib" "/etc" "/share" "${appDir}" ];
postBuild = ''
(
set -e
mkdir -p $out/{etc,var/run}
mkdir -p $out/${appDir}/{.dcap-qcnl,.az-dcap-client}
ln -s ${manifestFile} $out/${appDir}/${appName}.manifest.toml
# Increase IPv4 address priority
printf "precedence ::ffff:0:0/96 100\n" > $out/etc/gai.conf
${
if sgx_default_qcnl_conf != null then
"rm -f $out/etc/sgx_default_qcnl.conf; ln -s ${sgx_default_qcnl_conf} $out/etc/sgx_default_qcnl.conf;"
else ""
}
eval "${extraPostBuild}"
)
'';
};

extendedContents = pkgs.buildEnv {
name = "extended-root-${appName}";

paths = with pkgs.dockerTools; with nixsgx;[
coreutils
restart-aesmd
sgx-psw
usrBinEnv
binSh
fakeNss
] ++ extendedPackages;

pathsToLink = [ "/bin" "/lib" "/etc" "/share" ];

postBuild =
if sgx_default_qcnl_conf != null then ''
(
set -e
mkdir -p $out/etc
rm -f $out/etc/sgx_default_qcnl.conf
ln -s ${sgx_default_qcnl_conf} $out/etc/sgx_default_qcnl.conf
)
'' else null;
};

config = {
Env = [
"SSL_CERT_FILE=/etc/ssl/certs/ca-bundle.crt"
"HOME=${appDir}"
"LD_LIBRARY_PATH=${lib.makeLibraryPath [ pkgs.curl.out (if isAzure then nixsgx.azure-dcap-client.out else nixsgx.sgx-dcap.default_qpl)]}"
];
Entrypoint = [ "/bin/sh" "-c" ];
Cmd = [
''
${extraCmd};
if [ -n "$GRAMINE_DIRECT" ]; then
exec gramine-direct ${appName};
else
[[ -r /var/run/aesmd/aesm.socket ]] || restart-aesmd >&2;
exec gramine-sgx ${appName};
fi
''
];
WorkingDir = "${appDir}";
};


# create a base image with the nix store included, because the derived image
# will run gramine-sgx-sign and has does not include store paths,
# otherwise all store paths from the `fakeRootCommands` will be included.
appImage = pkgs.dockerTools.buildLayeredImage { name = "${name}-app"; inherit contents; };

addGramineManifest = fromImage:
let
mkNixStore = contents:
let
contentsList = if builtins.isList contents then contents else [ contents ];
in
''
${rsync}/bin/rsync -ar --files-from=${writeClosure contentsList} / ./
'';

in
pkgs.dockerTools.buildLayeredImage
{
name = "${name}-manifest-${appName}";
inherit tag;
inherit contents;
inherit fromImage;

includeStorePaths = false;
extraCommands = (mkNixStore contents) + ''
(
set -e
CHROOT=$(pwd)
appDir="${appDir}"
cd "''${appDir#/}"
HOME="''${appDir#/}" ${nixsgx.gramine}/bin/gramine-manifest ${manifestFile} ${appName}.manifest;
${nixsgx.gramine}/bin/gramine-sgx-sign \
--chroot "$CHROOT" \
--manifest ${appName}.manifest \
--output ${appName}.manifest.sgx \
--key ${keyfile};
eval "${extraChrootCommands}"
cd "$CHROOT"
chmod u+wx -R nix
rm -fr nix
)
'';
};

injectSigFile = fromImage:
if sigFile != null then
pkgs.dockerTools.buildLayeredImage
{
inherit name;
inherit config;
inherit tag;
inherit fromImage;

includeStorePaths = false;
extraCommands = ''
mkdir -p ${appDir}
cp ${sigFile} ${appDir}/${appName}.sig
'';
}
else fromImage;

extendImage = fromImage:
pkgs.dockerTools.buildLayeredImage
{
inherit name;
inherit tag;
inherit config;
inherit fromImage;
contents = extendedContents;
};
in
injectSigFile (extendImage (addGramineManifest appImage))
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