chiark / gitweb /
machine: make sure unpriviliged "machinectl status" can show the machine's OS version
[elogind.git] / src / machine / machine-dbus.c
index 2c7f3a7..89c9377 100644 (file)
 
 #include <errno.h>
 #include <string.h>
+#include <sys/capability.h>
+#include <arpa/inet.h>
 
 #include "bus-util.h"
+#include "bus-label.h"
 #include "strv.h"
+#include "bus-errors.h"
+#include "copy.h"
+#include "fileio.h"
+#include "in-addr-util.h"
+#include "local-addresses.h"
 #include "machine.h"
 
 static int property_get_id(
@@ -75,9 +83,34 @@ static int property_get_state(
         return 1;
 }
 
+static int property_get_netif(
+                sd_bus *bus,
+                const char *path,
+                const char *interface,
+                const char *property,
+                sd_bus_message *reply,
+                void *userdata,
+                sd_bus_error *error) {
+
+        Machine *m = userdata;
+        int r;
+
+        assert(bus);
+        assert(reply);
+        assert(m);
+
+        assert_cc(sizeof(int) == sizeof(int32_t));
+
+        r = sd_bus_message_append_array(reply, 'i', m->netif, m->n_netif * sizeof(int));
+        if (r < 0)
+                return r;
+
+        return 1;
+}
+
 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_class, machine_class, MachineClass);
 
-static int method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+int bus_machine_method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Machine *m = userdata;
         int r;
 
@@ -92,7 +125,7 @@ static int method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata
         return sd_bus_reply_method_return(message, NULL);
 }
 
-static int method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+int bus_machine_method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Machine *m = userdata;
         const char *swho;
         int32_t signo;
@@ -125,24 +158,259 @@ static int method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_
         return sd_bus_reply_method_return(message, NULL);
 }
 
+int bus_machine_method_get_addresses(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_close_pair_ int pair[2] = { -1, -1 };
+        _cleanup_free_ char *us = NULL, *them = NULL;
+        _cleanup_close_ int netns_fd = -1;
+        Machine *m = userdata;
+        const char *p;
+        siginfo_t si;
+        pid_t child;
+        int r;
+
+        assert(bus);
+        assert(message);
+        assert(m);
+
+        r = readlink_malloc("/proc/self/ns/net", &us);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        p = procfs_file_alloca(m->leader, "ns/net");
+        r = readlink_malloc(p, &them);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        if (streq(us, them))
+                return sd_bus_error_setf(error, BUS_ERROR_NO_PRIVATE_NETWORKING, "Machine %s does not use private networking", m->name);
+
+        r = namespace_open(m->leader, NULL, NULL, &netns_fd, NULL);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0)
+                return sd_bus_error_set_errno(error, -errno);
+
+        child = fork();
+        if (child < 0)
+                return sd_bus_error_set_errno(error, -errno);
+
+        if (child == 0) {
+                _cleanup_free_ struct local_address *addresses = NULL;
+                struct local_address *a;
+                int i, n;
+
+                pair[0] = safe_close(pair[0]);
+
+                r = namespace_enter(-1, -1, netns_fd, -1);
+                if (r < 0)
+                        _exit(EXIT_FAILURE);
+
+                n = local_addresses(&addresses);
+                if (n < 0)
+                        _exit(EXIT_FAILURE);
+
+                for (a = addresses, i = 0; i < n; a++, i++) {
+                        struct iovec iov[2] = {
+                                { .iov_base = &a->family, .iov_len = sizeof(a->family) },
+                                { .iov_base = &a->address, .iov_len = FAMILY_ADDRESS_SIZE(a->family) },
+                        };
+
+                        r = writev(pair[1], iov, 2);
+                        if (r < 0)
+                                _exit(EXIT_FAILURE);
+                }
+
+                pair[1] = safe_close(pair[1]);
+
+                _exit(EXIT_SUCCESS);
+        }
+
+        pair[1] = safe_close(pair[1]);
+
+        r = sd_bus_message_new_method_return(message, &reply);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        r = sd_bus_message_open_container(reply, 'a', "(iay)");
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        for (;;) {
+                int family;
+                ssize_t n;
+                union in_addr_union in_addr;
+                struct iovec iov[2];
+                struct msghdr mh = {
+                        .msg_iov = iov,
+                        .msg_iovlen = 2,
+                };
+
+                iov[0] = (struct iovec) { .iov_base = &family, .iov_len = sizeof(family) };
+                iov[1] = (struct iovec) { .iov_base = &in_addr, .iov_len = sizeof(in_addr) };
+
+                n = recvmsg(pair[0], &mh, 0);
+                if (n < 0)
+                        return sd_bus_error_set_errno(error, -errno);
+                if ((size_t) n < sizeof(family))
+                        break;
+
+                r = sd_bus_message_open_container(reply, 'r', "iay");
+                if (r < 0)
+                        return sd_bus_error_set_errno(error, r);
+
+                r = sd_bus_message_append(reply, "i", family);
+                if (r < 0)
+                        return sd_bus_error_set_errno(error, r);
+
+                switch (family) {
+
+                case AF_INET:
+                        if (n != sizeof(struct in_addr) + sizeof(family))
+                                return sd_bus_error_set_errno(error, EIO);
+
+                        r = sd_bus_message_append_array(reply, 'y', &in_addr.in, sizeof(in_addr.in));
+                        break;
+
+                case AF_INET6:
+                        if (n != sizeof(struct in6_addr) + sizeof(family))
+                                return sd_bus_error_set_errno(error, EIO);
+
+                        r = sd_bus_message_append_array(reply, 'y', &in_addr.in6, sizeof(in_addr.in6));
+                        break;
+                }
+                if (r < 0)
+                        return sd_bus_error_set_errno(error, r);
+
+                r = sd_bus_message_close_container(reply);
+                if (r < 0)
+                        return sd_bus_error_set_errno(error, r);
+        }
+
+        r = wait_for_terminate(child, &si);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+        if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
+                return sd_bus_error_set_errno(error, EIO);
+
+        r = sd_bus_message_close_container(reply);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        return sd_bus_send(bus, reply, NULL);
+}
+
+int bus_machine_method_get_os_release(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_close_ int mntns_fd = -1, root_fd = -1;
+        _cleanup_close_pair_ int pair[2] = { -1, -1 };
+        _cleanup_strv_free_ char **l = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        Machine *m = userdata;
+        char **k, **v;
+        siginfo_t si;
+        pid_t child;
+        int r;
+
+        assert(bus);
+        assert(message);
+        assert(m);
+
+        r = namespace_open(m->leader, NULL, &mntns_fd, NULL, &root_fd);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0)
+                return sd_bus_error_set_errno(error, -errno);
+
+        child = fork();
+        if (child < 0)
+                return sd_bus_error_set_errno(error, -errno);
+
+        if (child == 0) {
+                _cleanup_close_ int fd = -1;
+
+                pair[0] = safe_close(pair[0]);
+
+                r = namespace_enter(-1, mntns_fd, -1, root_fd);
+                if (r < 0)
+                        _exit(EXIT_FAILURE);
+
+                fd = open("/etc/os-release", O_RDONLY|O_CLOEXEC);
+                if (fd < 0) {
+                        fd = open("/usr/lib/os-release", O_RDONLY|O_CLOEXEC);
+                        if (fd < 0)
+                                _exit(EXIT_FAILURE);
+                }
+
+                r = copy_bytes(fd, pair[1], (off_t) -1);
+                if (r < 0)
+                        _exit(EXIT_FAILURE);
+
+                _exit(EXIT_SUCCESS);
+        }
+
+        pair[1] = safe_close(pair[1]);
+
+        f = fdopen(pair[0], "re");
+        if (!f)
+                return sd_bus_error_set_errno(error, -errno);
+
+        pair[0] = -1;
+
+        r = load_env_file_pairs(f, "/etc/os-release", NULL, &l);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        r = wait_for_terminate(child, &si);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+        if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
+                return sd_bus_error_set_errno(error, EIO);
+
+        r = sd_bus_message_new_method_return(message, &reply);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        r = sd_bus_message_open_container(reply, 'a', "{ss}");
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        STRV_FOREACH_PAIR(k, v, l) {
+                r = sd_bus_message_append(reply, "{ss}", *k, *v);
+                if (r < 0)
+                        return sd_bus_error_set_errno(error, r);
+        }
+
+        r = sd_bus_message_close_container(reply);
+        if (r < 0)
+                return sd_bus_error_set_errno(error, r);
+
+        return sd_bus_send(bus, reply, NULL);
+}
+
 const sd_bus_vtable machine_vtable[] = {
         SD_BUS_VTABLE_START(0),
-        SD_BUS_PROPERTY("Name", "s", NULL, offsetof(Machine, name), 0),
-        SD_BUS_PROPERTY("Id", "ay", property_get_id, 0, 0),
-        SD_BUS_PROPERTY("Timestamp", "t", NULL, offsetof(Machine, timestamp.realtime), 0),
-        SD_BUS_PROPERTY("TimestampMonotonic", "t", NULL, offsetof(Machine, timestamp.monotonic), 0),
-        SD_BUS_PROPERTY("Service", "s", NULL, offsetof(Machine, service), 0),
-        SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Machine, scope), 0),
-        SD_BUS_PROPERTY("Leader", "u", NULL, offsetof(Machine, leader), 0),
-        SD_BUS_PROPERTY("Class", "s", property_get_class, offsetof(Machine, class), 0),
+        SD_BUS_PROPERTY("Name", "s", NULL, offsetof(Machine, name), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("Id", "ay", property_get_id, 0, SD_BUS_VTABLE_PROPERTY_CONST),
+        BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(Machine, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("Service", "s", NULL, offsetof(Machine, service), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("Unit", "s", NULL, offsetof(Machine, unit), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Machine, unit), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
+        SD_BUS_PROPERTY("Leader", "u", NULL, offsetof(Machine, leader), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("Class", "s", property_get_class, offsetof(Machine, class), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("RootDirectory", "s", NULL, offsetof(Machine, root_directory), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("NetworkInterfaces", "ai", property_get_netif, 0, SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
-        SD_BUS_PROPERTY("RootDirectory", "s", NULL, offsetof(Machine, root_directory), 0),
-        SD_BUS_METHOD("Terminate", NULL, NULL, method_terminate, 0),
-        SD_BUS_METHOD("Kill", "si", NULL, method_kill, 0),
+        SD_BUS_METHOD("Terminate", NULL, NULL, bus_machine_method_terminate, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
+        SD_BUS_METHOD("Kill", "si", NULL, bus_machine_method_kill, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
+        SD_BUS_METHOD("GetAddresses", NULL, "a(iay)", bus_machine_method_get_addresses, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("GetOSRelease", NULL, "a{ss}", bus_machine_method_get_os_release, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_VTABLE_END
 };
 
-int machine_object_find(sd_bus *bus, const char *path, const char *interface, void **found, void *userdata) {
+int machine_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
         Manager *m = userdata;
         Machine *machine;
         int r;
@@ -154,16 +422,21 @@ int machine_object_find(sd_bus *bus, const char *path, const char *interface, vo
         assert(m);
 
         if (streq(path, "/org/freedesktop/machine1/machine/self")) {
+                _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
                 sd_bus_message *message;
                 pid_t pid;
 
-                message = sd_bus_get_current(bus);
+                message = sd_bus_get_current_message(bus);
                 if (!message)
                         return 0;
 
-                r = sd_bus_get_owner_pid(bus, sd_bus_message_get_sender(message), &pid);
+                r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_PID, &creds);
                 if (r < 0)
-                        return 0;
+                        return r;
+
+                r = sd_bus_creds_get_pid(creds, &pid);
+                if (r < 0)
+                        return r;
 
                 r = manager_get_machine_by_pid(m, pid, &machine);
                 if (r <= 0)
@@ -176,7 +449,7 @@ int machine_object_find(sd_bus *bus, const char *path, const char *interface, vo
                 if (!p)
                         return 0;
 
-                e = sd_bus_label_unescape(p);
+                e = bus_label_unescape(p);
                 if (!e)
                         return -ENOMEM;
 
@@ -194,14 +467,14 @@ char *machine_bus_path(Machine *m) {
 
         assert(m);
 
-        e = sd_bus_label_escape(m->name);
+        e = bus_label_escape(m->name);
         if (!e)
                 return NULL;
 
         return strappend("/org/freedesktop/machine1/machine/", e);
 }
 
-int machine_node_enumerator(sd_bus *bus, const char *path, char ***nodes, void *userdata) {
+int machine_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
         _cleanup_strv_free_ char **l = NULL;
         Machine *machine = NULL;
         Manager *m = userdata;
@@ -219,11 +492,9 @@ int machine_node_enumerator(sd_bus *bus, const char *path, char ***nodes, void *
                 if (!p)
                         return -ENOMEM;
 
-                r = strv_push(&l, p);
-                if (r < 0) {
-                        free(p);
+                r = strv_consume(&l, p);
+                if (r < 0)
                         return r;
-                }
         }
 
         *nodes = l;