152 lines
4.4 KiB
Nix
152 lines
4.4 KiB
Nix
# tcsd daemon.
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{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.services.tcsd;
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tcsdConf = pkgs.writeText "tcsd.conf" ''
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port = 30003
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num_threads = 10
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system_ps_file = ${cfg.stateDir}/system.data
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# This is the log of each individual measurement done by the system.
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# By re-calculating the PCR registers based on this information, even
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# finer details about the measured environment can be inferred than
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# what is available directly from the PCR registers.
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firmware_log_file = /sys/kernel/security/tpm0/binary_bios_measurements
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kernel_log_file = /sys/kernel/security/ima/binary_runtime_measurements
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firmware_pcrs = ${cfg.firmwarePCRs}
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kernel_pcrs = ${cfg.kernelPCRs}
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platform_cred = ${cfg.platformCred}
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conformance_cred = ${cfg.conformanceCred}
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endorsement_cred = ${cfg.endorsementCred}
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#remote_ops = create_key,random
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#host_platform_class = server_12
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#all_platform_classes = pc_11,pc_12,mobile_12
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'';
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in
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{
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###### interface
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options = {
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services.tcsd = {
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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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Whether to enable tcsd, a Trusted Computing management service
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that provides TCG Software Stack (TSS). The tcsd daemon is
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the only portal to the Trusted Platform Module (TPM), a hardware
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chip on the motherboard.
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'';
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};
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user = mkOption {
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default = "tss";
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type = types.string;
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description = "User account under which tcsd runs.";
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};
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group = mkOption {
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default = "tss";
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type = types.string;
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description = "Group account under which tcsd runs.";
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};
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stateDir = mkOption {
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default = "/var/lib/tpm";
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type = types.path;
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description = ''
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The location of the system persistent storage file.
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The system persistent storage file holds keys and data across
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restarts of the TCSD and system reboots.
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'';
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};
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firmwarePCRs = mkOption {
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default = "0,1,2,3,4,5,6,7";
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type = types.string;
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description = "PCR indices used in the TPM for firmware measurements.";
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};
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kernelPCRs = mkOption {
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default = "8,9,10,11,12";
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type = types.string;
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description = "PCR indices used in the TPM for kernel measurements.";
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};
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platformCred = mkOption {
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default = "${cfg.stateDir}/platform.cert";
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type = types.path;
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description = ''
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Path to the platform credential for your TPM. Your TPM
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manufacturer may have provided you with a set of credentials
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(certificates) that should be used when creating identities
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using your TPM. When a user of your TPM makes an identity,
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this credential will be encrypted as part of that process.
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See the 1.1b TPM Main specification section 9.3 for information
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on this process. '';
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};
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conformanceCred = mkOption {
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default = "${cfg.stateDir}/conformance.cert";
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type = types.path;
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description = ''
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Path to the conformance credential for your TPM.
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See also the platformCred option'';
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};
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endorsementCred = mkOption {
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default = "${cfg.stateDir}/endorsement.cert";
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type = types.path;
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description = ''
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Path to the endorsement credential for your TPM.
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See also the platformCred option'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.systemPackages = [ pkgs.trousers ];
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# system.activationScripts.tcsd =
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# ''
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# chown ${cfg.user}:${cfg.group} ${tcsdConf}
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# '';
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systemd.services.tcsd = {
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description = "TCSD";
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after = [ "systemd-udev-settle.service" ];
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wantedBy = [ "multi-user.target" ];
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path = [ pkgs.trousers ];
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preStart =
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''
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mkdir -m 0700 -p ${cfg.stateDir}
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chown -R ${cfg.user}:${cfg.group} ${cfg.stateDir}
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'';
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serviceConfig.ExecStart = "${pkgs.trousers}/sbin/tcsd -f -c ${tcsdConf}";
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};
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users.users = optionalAttrs (cfg.user == "tss") (singleton
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{ name = "tss";
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group = "tss";
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uid = config.ids.uids.tss;
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});
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users.groups = optionalAttrs (cfg.group == "tss") (singleton
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{ name = "tss";
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gid = config.ids.gids.tss;
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});
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};
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}
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