#include <linux/seccomp-bpf.h>
#include <glob.h>
#include <libgen.h>
+#undef basename
#ifdef HAVE_PAM
#include <security/pam_appl.h>
#include "missing.h"
#include "utmp-wtmp.h"
#include "def.h"
-#include "loopback-setup.h"
#include "path-util.h"
#include "syscall-list.h"
#include "env-util.h"
/* This assumes there is a 'tty' group */
#define TTY_MODE 0620
+#define SNDBUF_SIZE (8*1024*1024)
+
static int shift_fds(int fds[], unsigned n_fds) {
int start, restart_from;
return "/dev/console";
}
-void exec_context_tty_reset(const ExecContext *context) {
+static void exec_context_tty_reset(const ExecContext *context) {
assert(context);
if (context->tty_vhangup)
o == EXEC_OUTPUT_JOURNAL_AND_CONSOLE;
}
-void exec_context_serialize(const ExecContext *context, Unit *u, FILE *f) {
- assert(context);
- assert(u);
- assert(f);
-
- if (context->tmp_dir)
- unit_serialize_item(u, f, "tmp-dir", context->tmp_dir);
-
- if (context->var_tmp_dir)
- unit_serialize_item(u, f, "var-tmp-dir", context->var_tmp_dir);
-}
-
static int open_null_as(int flags, int nfd) {
int fd, r;
assert(nfd >= 0);
- if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
+ fd = open("/dev/null", flags|O_NOCTTY);
+ if (fd < 0)
return -errno;
if (fd != nfd) {
return -errno;
}
+ fd_inc_sndbuf(fd, SNDBUF_SIZE);
+
dprintf(fd,
"%s\n"
"%s\n"
return r;
}
-_printf_attr_(1, 2) static int write_confirm_message(const char *format, ...) {
+_printf_(1, 2) static int write_confirm_message(const char *format, ...) {
int fd;
va_list ap;
/* This resulting string must fit in 10 chars (i.e. the length
* of "/sbin/init") to look pretty in /bin/ps */
- p = path_get_file_name(path);
+ p = basename(path);
if (isempty(p)) {
rename_process("(...)");
return;
const char *cgroup_path,
const char *unit_id,
int idle_pipe[4],
+ ExecRuntime *runtime,
pid_t *ret) {
_cleanup_strv_free_ char **files_env = NULL;
NULL);
free(line);
- if (context->private_tmp && !context->tmp_dir && !context->var_tmp_dir) {
- r = setup_tmpdirs(&context->tmp_dir, &context->var_tmp_dir);
- if (r < 0)
- return r;
- }
-
pid = fork();
if (pid < 0)
return -errno;
if (pid == 0) {
- int i, err;
- sigset_t ss;
+ _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL, **final_env = NULL, **final_argv = NULL;
const char *username = NULL, *home = NULL, *shell = NULL;
+ unsigned n_dont_close = 0, n_env = 0;
+ int dont_close[n_fds + 3];
uid_t uid = (uid_t) -1;
gid_t gid = (gid_t) -1;
- _cleanup_strv_free_ char **our_env = NULL, **pam_env = NULL,
- **final_env = NULL, **final_argv = NULL;
- unsigned n_env = 0;
+ sigset_t ss;
+ int i, err;
/* child */
* block init reexecution because it cannot bind its
* sockets */
log_forget_fds();
- err = close_all_fds(socket_fd >= 0 ? &socket_fd : fds,
- socket_fd >= 0 ? 1 : n_fds);
+
+ if (socket_fd >= 0)
+ dont_close[n_dont_close++] = socket_fd;
+ if (n_fds > 0) {
+ memcpy(dont_close + n_dont_close, fds, sizeof(int) * n_fds);
+ n_dont_close += n_fds;
+ }
+ if (runtime) {
+ if (runtime->netns_storage_socket[0] >= 0)
+ dont_close[n_dont_close++] = runtime->netns_storage_socket[0];
+ if (runtime->netns_storage_socket[1] >= 0)
+ dont_close[n_dont_close++] = runtime->netns_storage_socket[1];
+ }
+
+ err = close_all_fds(dont_close, n_dont_close);
if (err < 0) {
r = EXIT_FDS;
goto fail_child;
goto fail_child;
}
- err = setup_output(context, STDOUT_FILENO, socket_fd, path_get_file_name(command->path), unit_id, apply_tty_stdin);
+ err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
if (err < 0) {
r = EXIT_STDOUT;
goto fail_child;
}
- err = setup_output(context, STDERR_FILENO, socket_fd, path_get_file_name(command->path), unit_id, apply_tty_stdin);
+ err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
if (err < 0) {
r = EXIT_STDERR;
goto fail_child;
}
}
#endif
- if (context->private_network) {
- if (unshare(CLONE_NEWNET) < 0) {
- err = -errno;
+ if (context->private_network && runtime && runtime->netns_storage_socket[0] >= 0) {
+ err = setup_netns(runtime->netns_storage_socket);
+ if (err < 0) {
r = EXIT_NETWORK;
goto fail_child;
}
-
- loopback_setup();
}
- if (strv_length(context->read_write_dirs) > 0 ||
- strv_length(context->read_only_dirs) > 0 ||
- strv_length(context->inaccessible_dirs) > 0 ||
+ if (!strv_isempty(context->read_write_dirs) ||
+ !strv_isempty(context->read_only_dirs) ||
+ !strv_isempty(context->inaccessible_dirs) ||
context->mount_flags != 0 ||
- context->private_tmp) {
- err = setup_namespace(context->read_write_dirs,
- context->read_only_dirs,
- context->inaccessible_dirs,
- context->tmp_dir,
- context->var_tmp_dir,
- context->private_tmp,
- context->mount_flags);
+ (context->private_tmp && runtime && (runtime->tmp_dir || runtime->var_tmp_dir))) {
+
+ char *tmp = NULL, *var = NULL;
+
+ /* The runtime struct only contains the parent
+ * of the private /tmp, which is
+ * non-accessible to world users. Inside of it
+ * there's a /tmp that is sticky, and that's
+ * the one we want to use here. */
+
+ if (context->private_tmp && runtime) {
+ if (runtime->tmp_dir)
+ tmp = strappenda(runtime->tmp_dir, "/tmp");
+ if (runtime->var_tmp_dir)
+ var = strappenda(runtime->var_tmp_dir, "/tmp");
+ }
+
+ err = setup_namespace(
+ context->read_write_dirs,
+ context->read_only_dirs,
+ context->inaccessible_dirs,
+ tmp,
+ var,
+ context->mount_flags);
+
if (err < 0) {
r = EXIT_NAMESPACE;
goto fail_child;
c->timer_slack_nsec = (nsec_t) -1;
}
-static void *remove_tmpdir_thread(void *p) {
- int r;
- _cleanup_free_ char *dirp = p;
- char *dir;
-
- assert(dirp);
-
- r = rm_rf_dangerous(dirp, false, true, false);
- dir = dirname(dirp);
- if (r < 0)
- log_warning("Failed to remove content of temporary directory %s: %s",
- dir, strerror(-r));
- else {
- r = rmdir(dir);
- if (r < 0)
- log_warning("Failed to remove temporary directory %s: %s",
- dir, strerror(-r));
- }
-
- return NULL;
-}
-
-void exec_context_tmp_dirs_done(ExecContext *c) {
- char* dirs[] = {c->tmp_dir ? c->tmp_dir : c->var_tmp_dir,
- c->tmp_dir ? c->var_tmp_dir : NULL,
- NULL};
- char **dirp;
-
- for(dirp = dirs; *dirp; dirp++) {
- log_debug("Spawning thread to nuke %s", *dirp);
- asynchronous_job(remove_tmpdir_thread, *dirp);
- }
-
- c->tmp_dir = c->var_tmp_dir = NULL;
-}
-
-void exec_context_done(ExecContext *c, bool reloading_or_reexecuting) {
+void exec_context_done(ExecContext *c) {
unsigned l;
assert(c);
free(c->syscall_filter);
c->syscall_filter = NULL;
-
- if (!reloading_or_reexecuting)
- exec_context_tmp_dirs_done(c);
}
void exec_command_done(ExecCommand *c) {
ExecCommand *i;
while ((i = c)) {
- LIST_REMOVE(ExecCommand, command, c, i);
+ LIST_REMOVE(command, c, i);
exec_command_done(i);
free(i);
}
if (*l) {
/* It's kind of important, that we keep the order here */
- LIST_FIND_TAIL(ExecCommand, command, *l, end);
- LIST_INSERT_AFTER(ExecCommand, command, *l, end, e);
+ LIST_FIND_TAIL(command, *l, end);
+ LIST_INSERT_AFTER(command, *l, end, e);
} else
*l = e;
}
if (!l)
return -ENOMEM;
- if (!(p = strdup(path))) {
+ p = strdup(path);
+ if (!p) {
strv_free(l);
return -ENOMEM;
}
return 0;
}
+static int exec_runtime_allocate(ExecRuntime **rt) {
+
+ if (*rt)
+ return 0;
+
+ *rt = new0(ExecRuntime, 1);
+ if (!rt)
+ return -ENOMEM;
+
+ (*rt)->n_ref = 1;
+ (*rt)->netns_storage_socket[0] = (*rt)->netns_storage_socket[1] = -1;
+
+ return 0;
+}
+
+int exec_runtime_make(ExecRuntime **rt, ExecContext *c, const char *id) {
+ int r;
+
+ assert(rt);
+ assert(c);
+ assert(id);
+
+ if (*rt)
+ return 1;
+
+ if (!c->private_network && !c->private_tmp)
+ return 0;
+
+ r = exec_runtime_allocate(rt);
+ if (r < 0)
+ return r;
+
+ if (c->private_network && (*rt)->netns_storage_socket[0] < 0) {
+ if (socketpair(AF_UNIX, SOCK_DGRAM, 0, (*rt)->netns_storage_socket) < 0)
+ return -errno;
+ }
+
+ if (c->private_tmp && !(*rt)->tmp_dir) {
+ r = setup_tmp_dirs(id, &(*rt)->tmp_dir, &(*rt)->var_tmp_dir);
+ if (r < 0)
+ return r;
+ }
+
+ return 1;
+}
+
+ExecRuntime *exec_runtime_ref(ExecRuntime *r) {
+ assert(r);
+ assert(r->n_ref > 0);
+
+ r->n_ref++;
+ return r;
+}
+
+ExecRuntime *exec_runtime_unref(ExecRuntime *r) {
+
+ if (!r)
+ return NULL;
+
+ assert(r->n_ref > 0);
+
+ r->n_ref--;
+ if (r->n_ref <= 0) {
+ free(r->tmp_dir);
+ free(r->var_tmp_dir);
+ close_pipe(r->netns_storage_socket);
+ free(r);
+ }
+
+ return NULL;
+}
+
+int exec_runtime_serialize(ExecRuntime *rt, Unit *u, FILE *f, FDSet *fds) {
+ assert(u);
+ assert(f);
+ assert(fds);
+
+ if (!rt)
+ return 0;
+
+ if (rt->tmp_dir)
+ unit_serialize_item(u, f, "tmp-dir", rt->tmp_dir);
+
+ if (rt->var_tmp_dir)
+ unit_serialize_item(u, f, "var-tmp-dir", rt->var_tmp_dir);
+
+ if (rt->netns_storage_socket[0] >= 0) {
+ int copy;
+
+ copy = fdset_put_dup(fds, rt->netns_storage_socket[0]);
+ if (copy < 0)
+ return copy;
+
+ unit_serialize_item_format(u, f, "netns-socket-0", "%i", copy);
+ }
+
+ if (rt->netns_storage_socket[1] >= 0) {
+ int copy;
+
+ copy = fdset_put_dup(fds, rt->netns_storage_socket[1]);
+ if (copy < 0)
+ return copy;
+
+ unit_serialize_item_format(u, f, "netns-socket-1", "%i", copy);
+ }
+
+ return 0;
+}
+
+int exec_runtime_deserialize_item(ExecRuntime **rt, Unit *u, const char *key, const char *value, FDSet *fds) {
+ int r;
+
+ assert(rt);
+ assert(key);
+ assert(value);
+
+ if (streq(key, "tmp-dir")) {
+ char *copy;
+
+ r = exec_runtime_allocate(rt);
+ if (r < 0)
+ return r;
+
+ copy = strdup(value);
+ if (!copy)
+ return log_oom();
+
+ free((*rt)->tmp_dir);
+ (*rt)->tmp_dir = copy;
+
+ } else if (streq(key, "var-tmp-dir")) {
+ char *copy;
+
+ r = exec_runtime_allocate(rt);
+ if (r < 0)
+ return r;
+
+ copy = strdup(value);
+ if (!copy)
+ return log_oom();
+
+ free((*rt)->var_tmp_dir);
+ (*rt)->var_tmp_dir = copy;
+
+ } else if (streq(key, "netns-socket-0")) {
+ int fd;
+
+ r = exec_runtime_allocate(rt);
+ if (r < 0)
+ return r;
+
+ if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
+ log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
+ else {
+ if ((*rt)->netns_storage_socket[0] >= 0)
+ close_nointr_nofail((*rt)->netns_storage_socket[0]);
+
+ (*rt)->netns_storage_socket[0] = fdset_remove(fds, fd);
+ }
+ } else if (streq(key, "netns-socket-1")) {
+ int fd;
+
+ r = exec_runtime_allocate(rt);
+ if (r < 0)
+ return r;
+
+ if (safe_atoi(value, &fd) < 0 || !fdset_contains(fds, fd))
+ log_debug_unit(u->id, "Failed to parse netns socket value %s", value);
+ else {
+ if ((*rt)->netns_storage_socket[1] >= 0)
+ close_nointr_nofail((*rt)->netns_storage_socket[1]);
+
+ (*rt)->netns_storage_socket[1] = fdset_remove(fds, fd);
+ }
+ } else
+ return 0;
+
+ return 1;
+}
+
+static void *remove_tmpdir_thread(void *p) {
+ _cleanup_free_ char *path = p;
+
+ rm_rf_dangerous(path, false, true, false);
+ return NULL;
+}
+
+void exec_runtime_destroy(ExecRuntime *rt) {
+ if (!rt)
+ return;
+
+ /* If there are multiple users of this, let's leave the stuff around */
+ if (rt->n_ref > 1)
+ return;
+
+ if (rt->tmp_dir) {
+ log_debug("Spawning thread to nuke %s", rt->tmp_dir);
+ asynchronous_job(remove_tmpdir_thread, rt->tmp_dir);
+ rt->tmp_dir = NULL;
+ }
+
+ if (rt->var_tmp_dir) {
+ log_debug("Spawning thread to nuke %s", rt->var_tmp_dir);
+ asynchronous_job(remove_tmpdir_thread, rt->var_tmp_dir);
+ rt->var_tmp_dir = NULL;
+ }
+
+ close_pipe(rt->netns_storage_socket);
+}
+
static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
[EXEC_INPUT_NULL] = "null",
[EXEC_INPUT_TTY] = "tty",
~ianmdlvl / elogind.git / blobdiff