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creds: open up access to clients via Polkit
Use auth_admin_keep, so that users don't have to re-auth interactively again and again when encrypting/decrypting batches of credentials.
This commit is contained in:
Lennart Poettering
Luca Boccassi
parent
2a1ffd3e3a
commit
caef0bc3dc
@ -4,6 +4,7 @@
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#include <unistd.h>
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#include "build.h"
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#include "bus-polkit.h"
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#include "creds-util.h"
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#include "dirent-util.h"
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#include "escape.h"
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@ -983,6 +984,7 @@ static int vl_method_encrypt(Varlink *link, JsonVariant *parameters, VarlinkMeth
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{ "data", JSON_VARIANT_STRING, json_dispatch_unbase64_iovec, offsetof(MethodEncryptParameters, data), 0 },
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{ "timestamp", _JSON_VARIANT_TYPE_INVALID, json_dispatch_uint64, offsetof(MethodEncryptParameters, timestamp), 0 },
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{ "notAfter", _JSON_VARIANT_TYPE_INVALID, json_dispatch_uint64, offsetof(MethodEncryptParameters, not_after), 0 },
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VARLINK_DISPATCH_POLKIT_FIELD,
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{}
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};
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_cleanup_(method_encrypt_parameters_done) MethodEncryptParameters p = {
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@ -990,6 +992,7 @@ static int vl_method_encrypt(Varlink *link, JsonVariant *parameters, VarlinkMeth
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.not_after = UINT64_MAX,
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};
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_cleanup_(iovec_done) struct iovec output = {};
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Hashmap **polkit_registry = ASSERT_PTR(userdata);
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int r;
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assert(link);
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@ -1010,6 +1013,16 @@ static int vl_method_encrypt(Varlink *link, JsonVariant *parameters, VarlinkMeth
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if (p.not_after != UINT64_MAX && p.not_after < p.timestamp)
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return varlink_error_invalid_parameter_name(link, "notAfter");
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r = varlink_verify_polkit_async(
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link,
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/* bus= */ NULL,
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"io.systemd.credentials.encrypt",
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/* details= */ NULL,
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/* good_user= */ UID_INVALID,
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polkit_registry);
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if (r <= 0)
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return r;
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r = encrypt_credential_and_warn(
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arg_with_key,
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p.name,
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@ -1051,15 +1064,17 @@ static void method_decrypt_parameters_done(MethodDecryptParameters *p) {
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static int vl_method_decrypt(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
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static const JsonDispatch dispatch_table[] = {
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{ "name", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(MethodDecryptParameters, name), 0 },
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{ "blob", JSON_VARIANT_STRING, json_dispatch_unbase64_iovec, offsetof(MethodDecryptParameters, blob), 0 },
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{ "timestamp", _JSON_VARIANT_TYPE_INVALID, json_dispatch_uint64, offsetof(MethodDecryptParameters, timestamp), 0 },
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{ "name", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(MethodDecryptParameters, name), 0 },
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{ "blob", JSON_VARIANT_STRING, json_dispatch_unbase64_iovec, offsetof(MethodDecryptParameters, blob), JSON_MANDATORY },
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{ "timestamp", _JSON_VARIANT_TYPE_INVALID, json_dispatch_uint64, offsetof(MethodDecryptParameters, timestamp), 0 },
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VARLINK_DISPATCH_POLKIT_FIELD,
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{}
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};
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_cleanup_(method_decrypt_parameters_done) MethodDecryptParameters p = {
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.timestamp = UINT64_MAX,
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};
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_cleanup_(iovec_done_erase) struct iovec output = {};
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Hashmap **polkit_registry = ASSERT_PTR(userdata);
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int r;
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assert(link);
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@ -1073,11 +1088,19 @@ static int vl_method_decrypt(Varlink *link, JsonVariant *parameters, VarlinkMeth
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if (p.name && !credential_name_valid(p.name))
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return varlink_error_invalid_parameter_name(link, "name");
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if (!p.blob.iov_base)
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return varlink_error_invalid_parameter_name(link, "blob");
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if (p.timestamp == UINT64_MAX)
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p.timestamp = now(CLOCK_REALTIME);
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r = varlink_verify_polkit_async(
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link,
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/* bus= */ NULL,
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"io.systemd.credentials.decrypt",
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/* details= */ NULL,
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/* good_user= */ UID_INVALID,
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polkit_registry);
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if (r <= 0)
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return r;
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r = decrypt_credential_and_warn(
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p.name,
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p.timestamp,
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@ -1116,10 +1139,11 @@ static int run(int argc, char *argv[]) {
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if (arg_varlink) {
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_cleanup_(varlink_server_unrefp) VarlinkServer *varlink_server = NULL;
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_cleanup_(hashmap_freep) Hashmap *polkit_registry = NULL;
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/* Invocation as Varlink service */
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r = varlink_server_new(&varlink_server, VARLINK_SERVER_ROOT_ONLY|VARLINK_SERVER_INHERIT_USERDATA);
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r = varlink_server_new(&varlink_server, VARLINK_SERVER_ACCOUNT_UID|VARLINK_SERVER_INHERIT_USERDATA);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate Varlink server: %m");
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@ -1134,6 +1158,8 @@ static int run(int argc, char *argv[]) {
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if (r < 0)
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return log_error_errno(r, "Failed to bind Varlink methods: %m");
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varlink_server_set_userdata(varlink_server, &polkit_registry);
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r = varlink_server_loop_auto(varlink_server);
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if (r < 0)
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return log_error_errno(r, "Failed to run Varlink event loop: %m");
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40
src/creds/io.systemd.credentials.policy
Normal file
40
src/creds/io.systemd.credentials.policy
Normal file
@ -0,0 +1,40 @@
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<?xml version="1.0" encoding="UTF-8"?> <!--*-nxml-*-->
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<!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
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"https://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
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<!--
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SPDX-License-Identifier: LGPL-2.1-or-later
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This file is part of systemd.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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-->
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<policyconfig>
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<vendor>The systemd Project</vendor>
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<vendor_url>https://systemd.io</vendor_url>
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<action id="io.systemd.credentials.encrypt">
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<description gettext-domain="systemd">Allow encryption and signing of system credentials.</description>
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<message gettext-domain="systemd">Authentication is required for an application to encrypt and sign a system credential.</message>
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<defaults>
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<allow_any>auth_admin_keep</allow_any>
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<allow_inactive>auth_admin_keep</allow_inactive>
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<allow_active>auth_admin_keep</allow_active>
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</defaults>
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</action>
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<action id="io.systemd.credentials.decrypt">
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<description gettext-domain="systemd">Allow decryption of system credentials.</description>
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<message gettext-domain="systemd">Authentication is required for an application to decrypto a system credential.</message>
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<defaults>
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<allow_any>auth_admin_keep</allow_any>
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<allow_inactive>auth_admin_keep</allow_inactive>
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<allow_active>auth_admin_keep</allow_active>
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</defaults>
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</action>
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</policyconfig>
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@ -23,3 +23,6 @@ if install_sysconfdir
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install_emptydir(sysconfdir / 'credstore.encrypted',
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install_mode : 'rwx------')
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endif
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install_data('io.systemd.credentials.policy',
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install_dir : polkitpolicydir)
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@ -16,7 +16,7 @@ Before=sockets.target
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[Socket]
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ListenStream=/run/systemd/io.systemd.Credentials
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FileDescriptorName=varlink
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SocketMode=0600
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SocketMode=0666
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Accept=yes
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[Install]
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