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-rw-r--r--src/bus-proxyd/bus-proxyd.c328
1 files changed, 328 insertions, 0 deletions
diff --git a/src/bus-proxyd/bus-proxyd.c b/src/bus-proxyd/bus-proxyd.c
new file mode 100644
index 0000000000..b6bd6eb390
--- /dev/null
+++ b/src/bus-proxyd/bus-proxyd.c
@@ -0,0 +1,328 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+ Copyright 2013 Daniel Mack
+ Copyright 2014 Kay Sievers
+ Copyright 2015 David Herrmann
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <getopt.h>
+#include <pthread.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "sd-daemon.h"
+
+#include "alloc-util.h"
+#include "bus-internal.h"
+#include "bus-xml-policy.h"
+#include "capability-util.h"
+#include "def.h"
+#include "fd-util.h"
+#include "formats-util.h"
+#include "log.h"
+#include "proxy.h"
+#include "string-util.h"
+#include "strv.h"
+#include "user-util.h"
+#include "util.h"
+
+static char *arg_address = NULL;
+static char **arg_configuration = NULL;
+
+typedef struct {
+ int fd;
+ SharedPolicy *policy;
+ uid_t bus_uid;
+} ClientContext;
+
+static ClientContext *client_context_free(ClientContext *c) {
+ if (!c)
+ return NULL;
+
+ safe_close(c->fd);
+ free(c);
+
+ return NULL;
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(ClientContext*, client_context_free);
+
+static int client_context_new(ClientContext **out) {
+ _cleanup_(client_context_freep) ClientContext *c = NULL;
+
+ c = new0(ClientContext, 1);
+ if (!c)
+ return -ENOMEM;
+
+ c->fd = -1;
+
+ *out = c;
+ c = NULL;
+ return 0;
+}
+
+static void *run_client(void *userdata) {
+ _cleanup_(client_context_freep) ClientContext *c = userdata;
+ _cleanup_(proxy_freep) Proxy *p = NULL;
+ char comm[16];
+ int r;
+
+ r = proxy_new(&p, c->fd, c->fd, arg_address);
+ c->fd = -1;
+
+ if (r < 0)
+ goto exit;
+
+ /* set comm to "p$PIDu$UID" and suffix with '*' if truncated */
+ r = snprintf(comm, sizeof(comm), "p" PID_FMT "u" UID_FMT, p->local_creds.pid, p->local_creds.uid);
+ if (r >= (ssize_t)sizeof(comm))
+ comm[sizeof(comm) - 2] = '*';
+ (void) prctl(PR_SET_NAME, comm);
+
+ r = proxy_set_policy(p, c->policy, arg_configuration);
+ if (r < 0)
+ goto exit;
+
+ r = proxy_hello_policy(p, c->bus_uid);
+ if (r < 0)
+ goto exit;
+
+ r = proxy_run(p);
+
+exit:
+ return NULL;
+}
+
+static int loop_clients(int accept_fd, uid_t bus_uid) {
+ _cleanup_(shared_policy_freep) SharedPolicy *sp = NULL;
+ pthread_attr_t attr;
+ int r;
+
+ r = pthread_attr_init(&attr);
+ if (r != 0)
+ return log_error_errno(r, "Cannot initialize pthread attributes: %m");
+
+ r = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+ if (r != 0) {
+ r = log_error_errno(r, "Cannot mark pthread attributes as detached: %m");
+ goto finish;
+ }
+
+ r = shared_policy_new(&sp);
+ if (r < 0)
+ goto finish;
+
+ for (;;) {
+ ClientContext *c;
+ pthread_t tid;
+ int fd;
+
+ fd = accept4(accept_fd, NULL, NULL, SOCK_NONBLOCK | SOCK_CLOEXEC);
+ if (fd < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ continue;
+
+ r = log_error_errno(errno, "accept4() failed: %m");
+ goto finish;
+ }
+
+ r = client_context_new(&c);
+ if (r < 0) {
+ log_oom();
+ close(fd);
+ continue;
+ }
+
+ c->fd = fd;
+ c->policy = sp;
+ c->bus_uid = bus_uid;
+
+ r = pthread_create(&tid, &attr, run_client, c);
+ if (r != 0) {
+ log_warning_errno(r, "Cannot spawn thread, ignoring: %m");
+ client_context_free(c);
+ continue;
+ }
+ }
+
+finish:
+ pthread_attr_destroy(&attr);
+ return r;
+}
+
+static int help(void) {
+
+ printf("%s [OPTIONS...]\n\n"
+ "DBus proxy server.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " --configuration=PATH Configuration file or directory\n"
+ " --machine=MACHINE Connect to specified machine\n"
+ " --address=ADDRESS Connect to the bus specified by ADDRESS\n"
+ " (default: " DEFAULT_SYSTEM_BUS_ADDRESS ")\n",
+ program_invocation_short_name);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_ADDRESS,
+ ARG_CONFIGURATION,
+ ARG_MACHINE,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "address", required_argument, NULL, ARG_ADDRESS },
+ { "configuration", required_argument, NULL, ARG_CONFIGURATION },
+ { "machine", required_argument, NULL, ARG_MACHINE },
+ {},
+ };
+
+ int c, r;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
+
+ switch (c) {
+
+ case 'h':
+ help();
+ return 0;
+
+ case ARG_VERSION:
+ return version();
+
+ case ARG_ADDRESS:
+ r = free_and_strdup(&arg_address, optarg);
+ if (r < 0)
+ return log_oom();
+ break;
+
+ case ARG_CONFIGURATION:
+ r = strv_extend(&arg_configuration, optarg);
+ if (r < 0)
+ return log_oom();
+ break;
+
+ case ARG_MACHINE: {
+ _cleanup_free_ char *e = NULL;
+ char *a;
+
+ e = bus_address_escape(optarg);
+ if (!e)
+ return log_oom();
+
+ a = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e, NULL);
+ if (!a)
+ return log_oom();
+
+ free(arg_address);
+ arg_address = a;
+
+ break;
+ }
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unhandled option");
+ }
+
+ if (argc > optind) {
+ log_error("Too many arguments");
+ return -EINVAL;
+ }
+
+ if (!arg_address) {
+ arg_address = strdup(DEFAULT_SYSTEM_BUS_ADDRESS);
+ if (!arg_address)
+ return log_oom();
+ }
+
+ return 1;
+}
+
+int main(int argc, char *argv[]) {
+ int r, accept_fd;
+ uid_t uid, bus_uid;
+ gid_t gid;
+
+ log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
+ log_parse_environment();
+ log_open();
+
+ bus_uid = getuid();
+
+ if (geteuid() == 0) {
+ const char *user = "systemd-bus-proxy";
+
+ r = get_user_creds(&user, &uid, &gid, NULL, NULL);
+ if (r < 0) {
+ log_error_errno(r, "Cannot resolve user name %s: %m", user);
+ goto finish;
+ }
+
+ r = drop_privileges(uid, gid, 1ULL << CAP_IPC_OWNER);
+ if (r < 0) {
+ log_error_errno(r, "Cannot drop privileges: %m");
+ goto finish;
+ }
+ }
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ goto finish;
+
+ r = sd_listen_fds(0);
+ if (r != 1) {
+ log_error("Illegal number of file descriptors passed");
+ goto finish;
+ }
+
+ accept_fd = SD_LISTEN_FDS_START;
+
+ r = fd_nonblock(accept_fd, false);
+ if (r < 0) {
+ log_error_errno(r, "Cannot mark accept-fd non-blocking: %m");
+ goto finish;
+ }
+
+ r = loop_clients(accept_fd, bus_uid);
+
+finish:
+ sd_notify(false,
+ "STOPPING=1\n"
+ "STATUS=Shutting down.");
+
+ strv_free(arg_configuration);
+ free(arg_address);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-10 06:07:08 +0000