Handle Unix domain socket connections from outside our namespace

[elogind.git] / src / core / socket.c

diff --git a/src/core/socket.c b/src/core/socket.c
index 7eac0eb66de22a7489dd76dc9a05fefde774581d..d57e7701cae642e1e6db007ee142b9d03c6a48bc 100644 (file)
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -90,11 +90,8 @@ static void socket_init(Unit *u) {
         s->ip_ttl = -1;
         s->mark = -1;
 
-        exec_context_init(&s->exec_context);
         s->exec_context.std_output = u->manager->default_std_output;
         s->exec_context.std_error = u->manager->default_std_error;
-        kill_context_init(&s->kill_context);
-        cgroup_context_init(&s->cgroup_context);
 
         s->control_command_id = _SOCKET_EXEC_COMMAND_INVALID;
 }
@@ -119,9 +116,7 @@ void socket_free_ports(Socket *s) {
 
                 sd_event_source_unref(p->event_source);
 
-                if (p->fd >= 0)
-                        close_nointr_nofail(p->fd);
-
+                safe_close(p->fd);
                 free(p->path);
                 free(p);
         }
@@ -134,8 +129,6 @@ static void socket_done(Unit *u) {
 
         socket_free_ports(s);
 
-        cgroup_context_done(&s->cgroup_context);
-        exec_context_done(&s->exec_context);
         s->exec_runtime = exec_runtime_unref(s->exec_runtime);
         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
         s->control_command = NULL;
@@ -175,7 +168,12 @@ static int socket_arm_timer(Socket *s) {
                 return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT);
         }
 
-        return sd_event_add_monotonic(UNIT(s)->manager->event, now(CLOCK_MONOTONIC) + s->timeout_usec, 0, socket_dispatch_timer, s, &s->timer_event_source);
+        return sd_event_add_time(
+                        UNIT(s)->manager->event,
+                        &s->timer_event_source,
+                        CLOCK_MONOTONIC,
+                        now(CLOCK_MONOTONIC) + s->timeout_usec, 0,
+                        socket_dispatch_timer, s);
 }
 
 static int socket_instantiate_service(Socket *s) {
@@ -196,16 +194,14 @@ static int socket_instantiate_service(Socket *s) {
 
         assert(s->accept);
 
-        if (!(prefix = unit_name_to_prefix(UNIT(s)->id)))
+        prefix = unit_name_to_prefix(UNIT(s)->id);
+        if (!prefix)
                 return -ENOMEM;
 
-        r = asprintf(&name, "%s@%u.service", prefix, s->n_accepted);
-
-        if (r < 0)
+        if (asprintf(&name, "%s@%u.service", prefix, s->n_accepted) < 0)
                 return -ENOMEM;
 
         r = manager_load_unit(UNIT(s)->manager, name, NULL, NULL, &u);
-
         if (r < 0)
                 return r;
 
@@ -338,7 +334,7 @@ static int socket_add_extras(Socket *s) {
         if (r < 0)
                 return r;
 
-        r = unit_exec_context_defaults(u, &s->exec_context);
+        r = unit_patch_contexts(u);
         if (r < 0)
                 return r;
 
@@ -347,7 +343,7 @@ static int socket_add_extras(Socket *s) {
                 if (r < 0)
                         return r;
 
-                r = unit_add_default_slice(u);
+                r = unit_add_default_slice(u, &s->cgroup_context);
                 if (r < 0)
                         return r;
         }
@@ -595,13 +591,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 static int instance_from_socket(int fd, unsigned nr, char **instance) {
         socklen_t l;
         char *r;
-        union {
-                struct sockaddr sa;
-                struct sockaddr_un un;
-                struct sockaddr_in in;
-                struct sockaddr_in6 in6;
-                struct sockaddr_storage storage;
-        } local, remote;
+        union sockaddr_union local, remote;
 
         assert(fd >= 0);
         assert(instance);
@@ -673,17 +663,21 @@ static int instance_from_socket(int fd, unsigned nr, char **instance) {
                 int k;
 
                 k = getpeercred(fd, &ucred);
-                if (k < 0)
+                if (k >= 0) {
+                        if (asprintf(&r,
+                                     "%u-"PID_FMT"-"UID_FMT,
+                                     nr, ucred.pid, ucred.uid) < 0)
+                                return -ENOMEM;
+                } else if (k == -ENODATA) {
+                        /* This handles the case where somebody is
+                         * connecting from another pid/uid namespace
+                         * (e.g. from outside of our container). */
+                        if (asprintf(&r,
+                                     "%u-unknown",
+                                     nr) < 0)
+                                return -ENOMEM;
+                } else
                         return k;
-
-                if (asprintf(&r,
-                             "%u-%lu-%lu",
-                             nr,
-                             (unsigned long) ucred.pid,
-                             (unsigned long) ucred.uid) < 0)
-                        return -ENOMEM;
-
-                break;
         }
 
         default:
@@ -706,7 +700,7 @@ static void socket_close_fds(Socket *s) {
                 if (p->fd < 0)
                         continue;
 
-                close_nointr_nofail(p->fd);
+                p->fd = safe_close(p->fd);
 
                 /* One little note: we should never delete any sockets
                  * in the file system here! After all some other
@@ -715,8 +709,6 @@ static void socket_close_fds(Socket *s) {
                  * we delete sockets in the file system before we
                  * create a new one, not after we stopped using
                  * one! */
-
-                p->fd = -1;
         }
 }
 
@@ -886,9 +878,7 @@ static int fifo_address_create(
 
 fail:
         label_context_clear();
-
-        if (fd >= 0)
-                close_nointr_nofail(fd);
+        safe_close(fd);
 
         return r;
 }
@@ -923,8 +913,7 @@ static int special_address_create(
         return 0;
 
 fail:
-        if (fd >= 0)
-                close_nointr_nofail(fd);
+        safe_close(fd);
 
         return r;
 }
@@ -983,9 +972,7 @@ static int mq_address_create(
         return 0;
 
 fail:
-        if (fd >= 0)
-                close_nointr_nofail(fd);
-
+        safe_close(fd);
         return r;
 }
 
@@ -1112,7 +1099,7 @@ static int socket_watch_fds(Socket *s) {
                 if (p->event_source)
                         r = sd_event_source_set_enabled(p->event_source, SD_EVENT_ON);
                 else
-                        r = sd_event_add_io(UNIT(s)->manager->event, p->fd, EPOLLIN, socket_dispatch_io, p, &p->event_source);
+                        r = sd_event_add_io(UNIT(s)->manager->event, &p->event_source, p->fd, EPOLLIN, socket_dispatch_io, p);
 
                 if (r < 0) {
                         log_warning_unit(UNIT(s)->id, "Failed to watch listening fds: %s", strerror(-r));
@@ -1253,6 +1240,7 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
                        UNIT(s)->manager->confirm_spawn,
                        UNIT(s)->manager->cgroup_supported,
                        UNIT(s)->cgroup_path,
+                       manager_get_runtime_prefix(UNIT(s)->manager),
                        UNIT(s)->id,
                        0,
                        NULL,
@@ -1287,6 +1275,8 @@ static void socket_enter_dead(Socket *s, SocketResult f) {
         exec_runtime_destroy(s->exec_runtime);
         s->exec_runtime = exec_runtime_unref(s->exec_runtime);
 
+        exec_context_destroy_runtime_directory(&s->exec_context, manager_get_runtime_prefix(UNIT(s)->manager));
+
         socket_set_state(s, s->result != SOCKET_SUCCESS ? SOCKET_FAILED : SOCKET_DEAD);
 }
 
@@ -1344,8 +1334,12 @@ static void socket_enter_signal(Socket *s, SocketState state, SocketResult f) {
                         goto fail;
 
                 socket_set_state(s, state);
-        } else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
+        } else if (state == SOCKET_STOP_PRE_SIGTERM)
+                socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, SOCKET_SUCCESS);
+        else if (state == SOCKET_STOP_PRE_SIGKILL)
                 socket_enter_stop_post(s, SOCKET_SUCCESS);
+        else if (state == SOCKET_FINAL_SIGTERM)
+                socket_enter_signal(s, SOCKET_FINAL_SIGKILL, SOCKET_SUCCESS);
         else
                 socket_enter_dead(s, SOCKET_SUCCESS);
 
@@ -1471,7 +1465,7 @@ static void socket_enter_running(Socket *s, int cfd) {
                 log_debug_unit(UNIT(s)->id, "Suppressing connection request on %s since unit stop is scheduled.", UNIT(s)->id);
 
                 if (cfd >= 0)
-                        close_nointr_nofail(cfd);
+                        safe_close(cfd);
                 else  {
                         /* Flush all sockets by closing and reopening them */
                         socket_close_fds(s);
@@ -1519,7 +1513,7 @@ static void socket_enter_running(Socket *s, int cfd) {
 
                 if (s->n_connections >= s->max_connections) {
                         log_warning_unit(UNIT(s)->id, "%s: Too many incoming connections (%u)", UNIT(s)->id, s->n_connections);
-                        close_nointr_nofail(cfd);
+                        safe_close(cfd);
                         return;
                 }
 
@@ -1534,7 +1528,7 @@ static void socket_enter_running(Socket *s, int cfd) {
 
                         /* ENOTCONN is legitimate if TCP RST was received.
                          * This connection is over, but the socket unit lives on. */
-                        close_nointr_nofail(cfd);
+                        safe_close(cfd);
                         return;
                 }
 
@@ -1585,9 +1579,7 @@ fail:
                          bus_error_message(&error, r));
 
         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
-
-        if (cfd >= 0)
-                close_nointr_nofail(cfd);
+        safe_close(cfd);
 }
 
 static void socket_run_next(Socket *s) {
@@ -1818,8 +1810,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }
@@ -1838,8 +1829,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }
@@ -1858,8 +1848,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }
@@ -1877,8 +1866,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }
@@ -1896,8 +1884,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
                                         break;
 
                         if (p) {
-                                if (p->fd >= 0)
-                                        close_nointr_nofail(p->fd);
+                                safe_close(p->fd);
                                 p->fd = fdset_remove(fds, fd);
                         }
                 }