Merge pull request #1022 from poettering/machinectl-shell

Add new "machinectl shell" command for su(1)-like behaviour

10 files changed, 888 insertions, 225 deletions

diff --git a/src/machine/machine-dbus.c b/src/machine/machine-dbus.c
index b62a9bd813..af2b8eff06 100644
--- a/src/machine/machine-dbus.c
+++ b/src/machine/machine-dbus.c
@@ -44,6 +44,7 @@
 #include "machine-dbus.h"
 #include "formats-util.h"
 #include "process-util.h"
+#include "env-util.h"
 
 static int property_get_id(
                 sd_bus *bus,
@@ -185,141 +186,179 @@ int bus_machine_method_kill(sd_bus_message *message, void *userdata, sd_bus_erro
 
 int bus_machine_method_get_addresses(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(message);
         assert(m);
 
-        if (m->class != MACHINE_CONTAINER)
-                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting IP address data is only supported on container machines.");
-
-        r = readlink_malloc("/proc/self/ns/net", &us);
-        if (r < 0)
-                return r;
-
-        p = procfs_file_alloca(m->leader, "ns/net");
-        r = readlink_malloc(p, &them);
+        r = sd_bus_message_new_method_return(message, &reply);
         if (r < 0)
                 return 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, NULL);
+        r = sd_bus_message_open_container(reply, 'a', "(iay)");
         if (r < 0)
                 return r;
 
-        if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0)
-                return -errno;
-
-        child = fork();
-        if (child < 0)
-                return sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");
+        switch (m->class) {
 
-        if (child == 0) {
+        case MACHINE_HOST: {
                 _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, -1);
-                if (r < 0)
-                        _exit(EXIT_FAILURE);
+                int n, i;
 
                 n = local_addresses(NULL, 0, AF_UNSPEC, &addresses);
                 if (n < 0)
-                        _exit(EXIT_FAILURE);
+                        return n;
 
                 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);
+                        r = sd_bus_message_open_container(reply, 'r', "iay");
                         if (r < 0)
-                                _exit(EXIT_FAILURE);
-                }
-
-                pair[1] = safe_close(pair[1]);
+                                return r;
 
-                _exit(EXIT_SUCCESS);
-        }
-
-        pair[1] = safe_close(pair[1]);
+                        r = sd_bus_message_append(reply, "i", addresses[i].family);
+                        if (r < 0)
+                                return r;
 
-        r = sd_bus_message_new_method_return(message, &reply);
-        if (r < 0)
-                return r;
+                        r = sd_bus_message_append_array(reply, 'y', &addresses[i].address, FAMILY_ADDRESS_SIZE(addresses[i].family));
+                        if (r < 0)
+                                return r;
 
-        r = sd_bus_message_open_container(reply, 'a', "(iay)");
-        if (r < 0)
-                return r;
+                        r = sd_bus_message_close_container(reply);
+                        if (r < 0)
+                                return 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,
-                };
+                break;
+        }
 
-                iov[0] = (struct iovec) { .iov_base = &family, .iov_len = sizeof(family) };
-                iov[1] = (struct iovec) { .iov_base = &in_addr, .iov_len = sizeof(in_addr) };
+        case MACHINE_CONTAINER: {
+                _cleanup_close_pair_ int pair[2] = { -1, -1 };
+                _cleanup_free_ char *us = NULL, *them = NULL;
+                _cleanup_close_ int netns_fd = -1;
+                const char *p;
+                siginfo_t si;
+                pid_t child;
 
-                n = recvmsg(pair[0], &mh, 0);
-                if (n < 0)
-                        return -errno;
-                if ((size_t) n < sizeof(family))
-                        break;
+                r = readlink_malloc("/proc/self/ns/net", &us);
+                if (r < 0)
+                        return r;
 
-                r = sd_bus_message_open_container(reply, 'r', "iay");
+                p = procfs_file_alloca(m->leader, "ns/net");
+                r = readlink_malloc(p, &them);
                 if (r < 0)
                         return r;
 
-                r = sd_bus_message_append(reply, "i", family);
+                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, NULL);
                 if (r < 0)
                         return r;
 
-                switch (family) {
+                if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0)
+                        return -errno;
+
+                child = fork();
+                if (child < 0)
+                        return sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");
+
+                if (child == 0) {
+                        _cleanup_free_ struct local_address *addresses = NULL;
+                        struct local_address *a;
+                        int i, n;
+
+                        pair[0] = safe_close(pair[0]);
 
-                case AF_INET:
-                        if (n != sizeof(struct in_addr) + sizeof(family))
-                                return -EIO;
+                        r = namespace_enter(-1, -1, netns_fd, -1, -1);
+                        if (r < 0)
+                                _exit(EXIT_FAILURE);
+
+                        n = local_addresses(NULL, 0, AF_UNSPEC, &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 = sd_bus_message_append_array(reply, 'y', &in_addr.in, sizeof(in_addr.in));
-                        break;
+                                r = writev(pair[1], iov, 2);
+                                if (r < 0)
+                                        _exit(EXIT_FAILURE);
+                        }
 
-                case AF_INET6:
-                        if (n != sizeof(struct in6_addr) + sizeof(family))
-                                return -EIO;
+                        pair[1] = safe_close(pair[1]);
 
-                        r = sd_bus_message_append_array(reply, 'y', &in_addr.in6, sizeof(in_addr.in6));
-                        break;
+                        _exit(EXIT_SUCCESS);
                 }
-                if (r < 0)
-                        return r;
 
-                r = sd_bus_message_close_container(reply);
+                pair[1] = safe_close(pair[1]);
+
+                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 -errno;
+                        if ((size_t) n < sizeof(family))
+                                break;
+
+                        r = sd_bus_message_open_container(reply, 'r', "iay");
+                        if (r < 0)
+                                return r;
+
+                        r = sd_bus_message_append(reply, "i", family);
+                        if (r < 0)
+                                return r;
+
+                        switch (family) {
+
+                        case AF_INET:
+                                if (n != sizeof(struct in_addr) + sizeof(family))
+                                        return -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 -EIO;
+
+                                r = sd_bus_message_append_array(reply, 'y', &in_addr.in6, sizeof(in_addr.in6));
+                                break;
+                        }
+                        if (r < 0)
+                                return r;
+
+                        r = sd_bus_message_close_container(reply);
+                        if (r < 0)
+                                return r;
+                }
+
+                r = wait_for_terminate(child, &si);
                 if (r < 0)
-                        return r;
+                        return sd_bus_error_set_errnof(error, r, "Failed to wait for client: %m");
+                if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Client died abnormally.");
+                break;
         }
 
-        r = wait_for_terminate(child, &si);
-        if (r < 0)
-                return sd_bus_error_set_errnof(error, r, "Failed to wait for client: %m");
-        if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
-                return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Client died abnormally.");
+        default:
+                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting IP address data is only supported on container machines.");
+        }
 
         r = sd_bus_message_close_container(reply);
         if (r < 0)
@@ -330,73 +369,88 @@ int bus_machine_method_get_addresses(sd_bus_message *message, void *userdata, sd
 
 int bus_machine_method_get_os_release(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(message);
         assert(m);
 
-        if (m->class != MACHINE_CONTAINER)
-                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting OS release data is only supported on container machines.");
+        switch (m->class) {
 
-        r = namespace_open(m->leader, NULL, &mntns_fd, NULL, NULL, &root_fd);
-        if (r < 0)
-                return r;
+        case MACHINE_HOST:
+                r = load_env_file_pairs(NULL, "/etc/os-release", NULL, &l);
+                if (r < 0)
+                        return r;
 
-        if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0)
-                return -errno;
+                break;
 
-        child = fork();
-        if (child < 0)
-                return sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");
+        case MACHINE_CONTAINER: {
+                _cleanup_close_ int mntns_fd = -1, root_fd = -1;
+                _cleanup_close_pair_ int pair[2] = { -1, -1 };
+                _cleanup_fclose_ FILE *f = NULL;
+                siginfo_t si;
+                pid_t child;
 
-        if (child == 0) {
-                _cleanup_close_ int fd = -1;
+                r = namespace_open(m->leader, NULL, &mntns_fd, NULL, NULL, &root_fd);
+                if (r < 0)
+                        return r;
 
-                pair[0] = safe_close(pair[0]);
+                if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, pair) < 0)
+                        return -errno;
 
-                r = namespace_enter(-1, mntns_fd, -1, -1, root_fd);
-                if (r < 0)
-                        _exit(EXIT_FAILURE);
+                child = fork();
+                if (child < 0)
+                        return sd_bus_error_set_errnof(error, errno, "Failed to fork(): %m");
+
+                if (child == 0) {
+                        _cleanup_close_ int fd = -1;
 
-                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)
+                        pair[0] = safe_close(pair[0]);
+
+                        r = namespace_enter(-1, mntns_fd, -1, -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, false);
+                        if (r < 0)
                                 _exit(EXIT_FAILURE);
+
+                        _exit(EXIT_SUCCESS);
                 }
 
-                r = copy_bytes(fd, pair[1], (off_t) -1, false);
-                if (r < 0)
-                        _exit(EXIT_FAILURE);
+                pair[1] = safe_close(pair[1]);
 
-                _exit(EXIT_SUCCESS);
-        }
+                f = fdopen(pair[0], "re");
+                if (!f)
+                        return -errno;
 
-        pair[1] = safe_close(pair[1]);
+                pair[0] = -1;
 
-        f = fdopen(pair[0], "re");
-        if (!f)
-                return -errno;
+                r = load_env_file_pairs(f, "/etc/os-release", NULL, &l);
+                if (r < 0)
+                        return r;
 
-        pair[0] = -1;
+                r = wait_for_terminate(child, &si);
+                if (r < 0)
+                        return sd_bus_error_set_errnof(error, r, "Failed to wait for client: %m");
+                if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
+                        return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Client died abnormally.");
 
-        r = load_env_file_pairs(f, "/etc/os-release", NULL, &l);
-        if (r < 0)
-                return r;
+                break;
+        }
 
-        r = wait_for_terminate(child, &si);
-        if (r < 0)
-                return sd_bus_error_set_errnof(error, r, "Failed to wait for client: %m");
-        if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS)
-                return sd_bus_error_setf(error, SD_BUS_ERROR_FAILED, "Client died abnormally.");
+        default:
+                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Requesting OS release data is only supported on container machines.");
+        }
 
         r = sd_bus_message_new_method_return(message, &reply);
         if (r < 0)
@@ -429,10 +483,20 @@ int bus_machine_method_open_pty(sd_bus_message *message, void *userdata, sd_bus_
         assert(message);
         assert(m);
 
-        if (m->class != MACHINE_CONTAINER)
-                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Opening pseudo TTYs is only supported on container machines.");
+        r = bus_verify_polkit_async(
+                        message,
+                        CAP_SYS_ADMIN,
+                        m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-open-pty" : "org.freedesktop.machine1.open-pty",
+                        false,
+                        UID_INVALID,
+                        &m->manager->polkit_registry,
+                        error);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return 1; /* Will call us back */
 
-        master = openpt_in_namespace(m->leader, O_RDWR|O_NOCTTY|O_CLOEXEC);
+        master = machine_openpt(m, O_RDWR|O_NOCTTY|O_CLOEXEC);
         if (master < 0)
                 return master;
 
@@ -451,26 +515,67 @@ int bus_machine_method_open_pty(sd_bus_message *message, void *userdata, sd_bus_
         return sd_bus_send(NULL, reply, NULL);
 }
 
+static int container_bus_new(Machine *m, sd_bus **ret) {
+        int r;
+
+        assert(m);
+        assert(ret);
+
+        switch (m->class) {
+
+        case MACHINE_HOST:
+                *ret = NULL;
+                break;
+
+        case MACHINE_CONTAINER: {
+                _cleanup_bus_unref_ sd_bus *bus = NULL;
+                char *address;
+
+                r = sd_bus_new(&bus);
+                if (r < 0)
+                        return r;
+
+                if (asprintf(&address, "x-machine-kernel:pid=%1$" PID_PRI ";x-machine-unix:pid=%1$" PID_PRI, m->leader) < 0)
+                        return -ENOMEM;
+
+                bus->address = address;
+                bus->bus_client = true;
+                bus->trusted = false;
+                bus->is_system = true;
+
+                r = sd_bus_start(bus);
+                if (r < 0)
+                        return r;
+
+                *ret = bus;
+                bus = NULL;
+                break;
+        }
+
+        default:
+                return -EOPNOTSUPP;
+        }
+
+        return 0;
+}
+
 int bus_machine_method_open_login(sd_bus_message *message, void *userdata, sd_bus_error *error) {
         _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
-        _cleanup_free_ char *pty_name = NULL, *getty = NULL;
-        _cleanup_bus_unref_ sd_bus *container_bus = NULL;
+        _cleanup_free_ char *pty_name = NULL;
+        _cleanup_bus_flush_close_unref_ sd_bus *allocated_bus = NULL;
         _cleanup_close_ int master = -1;
+        sd_bus *container_bus = NULL;
         Machine *m = userdata;
-        const char *p;
-        char *address;
+        const char *p, *getty;
         int r;
 
         assert(message);
         assert(m);
 
-        if (m->class != MACHINE_CONTAINER)
-                return sd_bus_error_setf(error, SD_BUS_ERROR_NOT_SUPPORTED, "Opening logins is only supported on container machines.");
-
         r = bus_verify_polkit_async(
                         message,
                         CAP_SYS_ADMIN,
-                        "org.freedesktop.machine1.login",
+                        m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-login" : "org.freedesktop.machine1.login",
                         false,
                         UID_INVALID,
                         &m->manager->polkit_registry,
@@ -480,7 +585,7 @@ int bus_machine_method_open_login(sd_bus_message *message, void *userdata, sd_bu
         if (r == 0)
                 return 1; /* Will call us back */
 
-        master = openpt_in_namespace(m->leader, O_RDWR|O_NOCTTY|O_CLOEXEC);
+        master = machine_openpt(m, O_RDWR|O_NOCTTY|O_CLOEXEC);
         if (master < 0)
                 return master;
 
@@ -495,26 +600,13 @@ int bus_machine_method_open_login(sd_bus_message *message, void *userdata, sd_bu
         if (unlockpt(master) < 0)
                 return -errno;
 
-        r = sd_bus_new(&container_bus);
+        r = container_bus_new(m, &allocated_bus);
         if (r < 0)
                 return r;
 
-#  define ADDRESS_FMT "x-machine-kernel:pid=%1$" PID_PRI ";x-machine-unix:pid=%1$" PID_PRI
-        if (asprintf(&address, ADDRESS_FMT, m->leader) < 0)
-                return log_oom();
-
-        container_bus->address = address;
-        container_bus->bus_client = true;
-        container_bus->trusted = false;
-        container_bus->is_system = true;
+        container_bus = allocated_bus ?: m->manager->bus;
 
-        r = sd_bus_start(container_bus);
-        if (r < 0)
-                return r;
-
-        getty = strjoin("container-getty@", p, ".service", NULL);
-        if (!getty)
-                return log_oom();
+        getty = strjoina("container-getty@", p, ".service");
 
         r = sd_bus_call_method(
                         container_bus,
@@ -527,7 +619,228 @@ int bus_machine_method_open_login(sd_bus_message *message, void *userdata, sd_bu
         if (r < 0)
                 return r;
 
-        container_bus = sd_bus_unref(container_bus);
+        r = sd_bus_message_new_method_return(message, &reply);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(reply, "hs", master, pty_name);
+        if (r < 0)
+                return r;
+
+        return sd_bus_send(NULL, reply, NULL);
+}
+
+int bus_machine_method_open_shell(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *tm = NULL;
+        _cleanup_free_ char *pty_name = NULL;
+        _cleanup_bus_flush_close_unref_ sd_bus *allocated_bus = NULL;
+        sd_bus *container_bus = NULL;
+        _cleanup_close_ int master = -1;
+        _cleanup_strv_free_ char **env = NULL, **args = NULL;
+        Machine *m = userdata;
+        const char *p, *unit, *user, *path, *description, *utmp_id;
+        int r;
+
+        assert(message);
+        assert(m);
+
+        r = sd_bus_message_read(message, "ss", &user, &path);
+        if (r < 0)
+                return r;
+        if (isempty(user))
+                user = NULL;
+        if (isempty(path))
+                path = "/bin/sh";
+        if (!path_is_absolute(path))
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Specified path '%s' is not absolute", path);
+
+        r = sd_bus_message_read_strv(message, &args);
+        if (r < 0)
+                return r;
+        if (strv_isempty(args)) {
+                args = strv_free(args);
+
+                args = strv_new(path, NULL);
+                if (!args)
+                        return -ENOMEM;
+
+                args[0][0] = '-'; /* Tell /bin/sh that this shall be a login shell */
+        }
+
+        r = sd_bus_message_read_strv(message, &env);
+        if (r < 0)
+                return r;
+        if (!strv_env_is_valid(env))
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid environment assignments");
+
+        r = bus_verify_polkit_async(
+                        message,
+                        CAP_SYS_ADMIN,
+                        m->class == MACHINE_HOST ? "org.freedesktop.machine1.host-shell" : "org.freedesktop.machine1.shell",
+                        false,
+                        UID_INVALID,
+                        &m->manager->polkit_registry,
+                        error);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return 1; /* Will call us back */
+
+        master = machine_openpt(m, O_RDWR|O_NOCTTY|O_CLOEXEC);
+        if (master < 0)
+                return master;
+
+        r = ptsname_malloc(master, &pty_name);
+        if (r < 0)
+                return r;
+
+        p = path_startswith(pty_name, "/dev/pts/");
+        if (!p)
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "PTS name %s is invalid", pty_name);
+
+        utmp_id = path_startswith(pty_name, "/dev/");
+        assert(utmp_id);
+
+        if (unlockpt(master) < 0)
+                return -errno;
+
+        r = container_bus_new(m, &allocated_bus);
+        if (r < 0)
+                return r;
+
+        container_bus = allocated_bus ?: m->manager->bus;
+
+        r = sd_bus_message_new_method_call(
+                        container_bus,
+                        &tm,
+                        "org.freedesktop.systemd1",
+                        "/org/freedesktop/systemd1",
+                        "org.freedesktop.systemd1.Manager",
+                        "StartTransientUnit");
+        if (r < 0)
+                return r;
+
+        /* Name and mode */
+        unit = strjoina("container-shell@", p, ".service", NULL);
+        r = sd_bus_message_append(tm, "ss", unit, "fail");
+        if (r < 0)
+                return r;
+
+        /* Properties */
+        r = sd_bus_message_open_container(tm, 'a', "(sv)");
+        if (r < 0)
+                return r;
+
+        description = strjoina("Shell for User ", isempty(user) ? "root" : user);
+        r = sd_bus_message_append(tm,
+                                  "(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)(sv)",
+                                  "Description", "s", description,
+                                  "StandardInput", "s", "tty",
+                                  "StandardOutput", "s", "tty",
+                                  "StandardError", "s", "tty",
+                                  "TTYPath", "s", pty_name,
+                                  "SendSIGHUP", "b", true,
+                                  "IgnoreSIGPIPE", "b", false,
+                                  "KillMode", "s", "mixed",
+                                  "TTYVHangup", "b", true,
+                                  "TTYReset", "b", true,
+                                  "UtmpIdentifier", "s", utmp_id,
+                                  "UtmpMode", "s", "user",
+                                  "PAMName", "s", "login");
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(tm, "(sv)", "User", "s", isempty(user) ? "root" : user);
+        if (r < 0)
+                return r;
+
+        if (!strv_isempty(env)) {
+                r = sd_bus_message_open_container(tm, 'r', "sv");
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_append(tm, "s", "Environment");
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_open_container(tm, 'v', "as");
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_append_strv(tm, env);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_close_container(tm);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_close_container(tm);
+                if (r < 0)
+                        return r;
+        }
+
+        /* Exec container */
+        r = sd_bus_message_open_container(tm, 'r', "sv");
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(tm, "s", "ExecStart");
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_open_container(tm, 'v', "a(sasb)");
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_open_container(tm, 'a', "(sasb)");
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_open_container(tm, 'r', "sasb");
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(tm, "s", path);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append_strv(tm, args);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_append(tm, "b", true);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_close_container(tm);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_close_container(tm);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_close_container(tm);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_close_container(tm);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_close_container(tm);
+        if (r < 0)
+                return r;
+
+        /* Auxiliary units */
+        r = sd_bus_message_append(tm, "a(sa(sv))", 0);
+        if (r < 0)
+                return r;
+
+        r = sd_bus_call(container_bus, tm, 0, error, NULL);
+        if (r < 0)
+                return r;
 
         r = sd_bus_message_new_method_return(message, &reply);
         if (r < 0)
@@ -966,8 +1279,9 @@ const sd_bus_vtable machine_vtable[] = {
         SD_BUS_METHOD("Kill", "si", NULL, bus_machine_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
         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_METHOD("OpenPTY", NULL, "hs", bus_machine_method_open_pty, 0),
+        SD_BUS_METHOD("OpenPTY", NULL, "hs", bus_machine_method_open_pty, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("OpenLogin", NULL, "hs", bus_machine_method_open_login, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("OpenShell", "ssasas", "hs", bus_machine_method_open_shell, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("BindMount", "ssbb", NULL, bus_machine_method_bind_mount, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("CopyFrom", "ss", NULL, bus_machine_method_copy, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("CopyTo", "ss", NULL, bus_machine_method_copy, SD_BUS_VTABLE_UNPRIVILEGED),
diff --git a/src/machine/machine-dbus.h b/src/machine/machine-dbus.h
index d309131860..38b46ad936 100644
--- a/src/machine/machine-dbus.h
+++ b/src/machine/machine-dbus.h
@@ -35,6 +35,7 @@ int bus_machine_method_get_addresses(sd_bus_message *message, void *userdata, sd
 int bus_machine_method_get_os_release(sd_bus_message *message, void *userdata, sd_bus_error *error);
 int bus_machine_method_open_pty(sd_bus_message *message, void *userdata, sd_bus_error *error);
 int bus_machine_method_open_login(sd_bus_message *message, void *userdata, sd_bus_error *error);
+int bus_machine_method_open_shell(sd_bus_message *message, void *userdata, sd_bus_error *error);
 int bus_machine_method_bind_mount(sd_bus_message *message, void *userdata, sd_bus_error *error);
 int bus_machine_method_copy(sd_bus_message *message, void *userdata, sd_bus_error *error);
 
diff --git a/src/machine/machine.c b/src/machine/machine.c
index f045159d41..0d1b119dc1 100644
--- a/src/machine/machine.c
+++ b/src/machine/machine.c
@@ -37,12 +37,17 @@
 #include "machine-dbus.h"
 #include "formats-util.h"
 
-Machine* machine_new(Manager *manager, const char *name) {
+Machine* machine_new(Manager *manager, MachineClass class, const char *name) {
         Machine *m;
 
         assert(manager);
+        assert(class < _MACHINE_CLASS_MAX);
         assert(name);
 
+        /* Passing class == _MACHINE_CLASS_INVALID here is fine. It
+         * means as much as "we don't know yet", and that we'll figure
+         * it out later when loading the state file. */
+
         m = new0(Machine, 1);
         if (!m)
                 return NULL;
@@ -51,14 +56,17 @@ Machine* machine_new(Manager *manager, const char *name) {
         if (!m->name)
                 goto fail;
 
-        m->state_file = strappend("/run/systemd/machines/", m->name);
-        if (!m->state_file)
-                goto fail;
+        if (class != MACHINE_HOST) {
+                m->state_file = strappend("/run/systemd/machines/", m->name);
+                if (!m->state_file)
+                        goto fail;
+        }
+
+        m->class = class;
 
         if (hashmap_put(manager->machines, m->name, m) < 0)
                 goto fail;
 
-        m->class = _MACHINE_CLASS_INVALID;
         m->manager = manager;
 
         return m;
@@ -86,6 +94,9 @@ void machine_free(Machine *m) {
 
         (void) hashmap_remove(m->manager->machines, m->name);
 
+        if (m->manager->host_machine == m)
+                m->manager->host_machine = NULL;
+
         if (m->leader > 0)
                 (void) hashmap_remove_value(m->manager->machine_leaders, UINT_TO_PTR(m->leader), m);
 
@@ -105,7 +116,9 @@ int machine_save(Machine *m) {
         int r;
 
         assert(m);
-        assert(m->state_file);
+
+        if (!m->state_file)
+                return 0;
 
         if (!m->started)
                 return 0;
@@ -244,6 +257,9 @@ int machine_load(Machine *m) {
 
         assert(m);
 
+        if (!m->state_file)
+                return 0;
+
         r = parse_env_file(m->state_file, NEWLINE,
                            "SCOPE",     &m->unit,
                            "SCOPE_JOB", &m->scope_job,
@@ -325,6 +341,7 @@ static int machine_start_scope(Machine *m, sd_bus_message *properties, sd_bus_er
         int r = 0;
 
         assert(m);
+        assert(m->class != MACHINE_HOST);
 
         if (!m->unit) {
                 _cleanup_free_ char *escaped = NULL;
@@ -364,6 +381,9 @@ int machine_start(Machine *m, sd_bus_message *properties, sd_bus_error *error) {
 
         assert(m);
 
+        if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
+                return -EOPNOTSUPP;
+
         if (m->started)
                 return 0;
 
@@ -402,6 +422,7 @@ static int machine_stop_scope(Machine *m) {
         int r;
 
         assert(m);
+        assert(m->class != MACHINE_HOST);
 
         if (!m->unit)
                 return 0;
@@ -422,6 +443,9 @@ int machine_stop(Machine *m) {
         int r;
         assert(m);
 
+        if (!IN_SET(m->class, MACHINE_CONTAINER, MACHINE_VM))
+                return -EOPNOTSUPP;
+
         r = machine_stop_scope(m);
 
         m->stopping = true;
@@ -456,6 +480,9 @@ int machine_finalize(Machine *m) {
 bool machine_check_gc(Machine *m, bool drop_not_started) {
         assert(m);
 
+        if (m->class == MACHINE_HOST)
+                return true;
+
         if (drop_not_started && !m->started)
                 return false;
 
@@ -481,6 +508,9 @@ void machine_add_to_gc_queue(Machine *m) {
 MachineState machine_get_state(Machine *s) {
         assert(s);
 
+        if (s->class == MACHINE_HOST)
+                return MACHINE_RUNNING;
+
         if (s->stopping)
                 return MACHINE_CLOSING;
 
@@ -493,6 +523,9 @@ MachineState machine_get_state(Machine *s) {
 int machine_kill(Machine *m, KillWho who, int signo) {
         assert(m);
 
+        if (!IN_SET(m->class, MACHINE_VM, MACHINE_CONTAINER))
+                return -EOPNOTSUPP;
+
         if (!m->unit)
                 return -ESRCH;
 
@@ -509,6 +542,25 @@ int machine_kill(Machine *m, KillWho who, int signo) {
         return manager_kill_unit(m->manager, m->unit, signo, NULL);
 }
 
+int machine_openpt(Machine *m, int flags) {
+        assert(m);
+
+        switch (m->class) {
+
+        case MACHINE_HOST:
+                return posix_openpt(flags);
+
+        case MACHINE_CONTAINER:
+                if (m->leader <= 0)
+                        return -EINVAL;
+
+                return openpt_in_namespace(m->leader, flags);
+
+        default:
+                return -EOPNOTSUPP;
+        }
+}
+
 MachineOperation *machine_operation_unref(MachineOperation *o) {
         if (!o)
                 return NULL;
@@ -544,7 +596,8 @@ void machine_release_unit(Machine *m) {
 
 static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
         [MACHINE_CONTAINER] = "container",
-        [MACHINE_VM] = "vm"
+        [MACHINE_VM] = "vm",
+        [MACHINE_HOST] = "host",
 };
 
 DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass);
diff --git a/src/machine/machine.h b/src/machine/machine.h
index 0132b65a97..5f978289f2 100644
--- a/src/machine/machine.h
+++ b/src/machine/machine.h
@@ -39,6 +39,7 @@ typedef enum MachineState {
 typedef enum MachineClass {
         MACHINE_CONTAINER,
         MACHINE_VM,
+        MACHINE_HOST,
         _MACHINE_CLASS_MAX,
         _MACHINE_CLASS_INVALID = -1
 } MachineClass;
@@ -95,7 +96,7 @@ struct Machine {
         unsigned n_operations;
 };
 
-Machine* machine_new(Manager *manager, const char *name);
+Machine* machine_new(Manager *manager, MachineClass class, const char *name);
 void machine_free(Machine *m);
 bool machine_check_gc(Machine *m, bool drop_not_started);
 void machine_add_to_gc_queue(Machine *m);
@@ -120,3 +121,5 @@ MachineState machine_state_from_string(const char *s) _pure_;
 
 const char *kill_who_to_string(KillWho k) _const_;
 KillWho kill_who_from_string(const char *s) _pure_;
+
+int machine_openpt(Machine *m, int flags);
diff --git a/src/machine/machinectl.c b/src/machine/machinectl.c
index 66ed41087c..6b29e61642 100644
--- a/src/machine/machinectl.c
+++ b/src/machine/machinectl.c
@@ -55,6 +55,8 @@
 #include "process-util.h"
 #include "terminal-util.h"
 #include "signal-util.h"
+#include "env-util.h"
+#include "hostname-util.h"
 
 static char **arg_property = NULL;
 static bool arg_all = false;
@@ -75,6 +77,8 @@ static bool arg_force = false;
 static ImportVerify arg_verify = IMPORT_VERIFY_SIGNATURE;
 static const char* arg_dkr_index_url = NULL;
 static const char* arg_format = NULL;
+static const char *arg_uid = NULL;
+static char **arg_setenv = NULL;
 
 static void pager_open_if_enabled(void) {
 
@@ -154,6 +158,9 @@ static int list_machines(int argc, char *argv[], void *userdata) {
         while ((r = sd_bus_message_read(reply, "(ssso)", &name, &class, &service, &object)) > 0) {
                 size_t l;
 
+                if (name[0] == '.' && !arg_all)
+                        continue;
+
                 if (!GREEDY_REALLOC(machines, n_allocated, n_machines + 1))
                         return log_oom();
 
@@ -354,7 +361,8 @@ static int show_unit_cgroup(sd_bus *bus, const char *unit, pid_t leader) {
                         bus,
                         "org.freedesktop.systemd1",
                         path,
-                        endswith(unit, ".scope") ? "org.freedesktop.systemd1.Scope" : "org.freedesktop.systemd1.Service",
+                        endswith(unit, ".scope") ? "org.freedesktop.systemd1.Scope" :
+                        endswith(unit, ".slice") ? "org.freedesktop.systemd1.Slice" : "org.freedesktop.systemd1.Service",
                         "ControlGroup",
                         &error,
                         &reply,
@@ -368,9 +376,6 @@ static int show_unit_cgroup(sd_bus *bus, const char *unit, pid_t leader) {
         if (r < 0)
                 return bus_log_parse_error(r);
 
-        if (isempty(cgroup))
-                return 0;
-
         if (cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, cgroup, false) != 0 && leader <= 0)
                 return 0;
 
@@ -1170,20 +1175,72 @@ static int on_machine_removed(sd_bus_message *m, void *userdata, sd_bus_error *r
         return 0;
 }
 
+static int process_forward(sd_event *event, PTYForward **forward, int master, bool ignore_vhangup, const char *name) {
+        char last_char = 0;
+        bool machine_died;
+        int ret = 0, r;
+
+        assert(event);
+        assert(master >= 0);
+        assert(name);
+
+        assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGWINCH, SIGTERM, SIGINT, -1) >= 0);
+
+        if (streq(name, ".host"))
+                log_info("Connected to the local host. Press ^] three times within 1s to exit session.");
+        else
+                log_info("Connected to machine %s. Press ^] three times within 1s to exit session.", name);
+
+        sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
+        sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
+
+        r = pty_forward_new(event, master, ignore_vhangup, false, forward);
+        if (r < 0)
+                return log_error_errno(r, "Failed to create PTY forwarder: %m");
+
+        r = sd_event_loop(event);
+        if (r < 0)
+                return log_error_errno(r, "Failed to run event loop: %m");
+
+        pty_forward_get_last_char(*forward, &last_char);
+
+        machine_died =
+                ignore_vhangup &&
+                pty_forward_get_ignore_vhangup(*forward) == 0;
+
+        *forward = pty_forward_free(*forward);
+
+        if (last_char != '\n')
+                fputc('\n', stdout);
+
+        if (machine_died)
+                log_info("Machine %s terminated.", name);
+        else if (streq(name, ".host"))
+                log_info("Connection to the local host terminated.");
+        else
+                log_info("Connection to machine %s terminated.", name);
+
+        sd_event_get_exit_code(event, &ret);
+        return ret;
+}
+
 static int login_machine(int argc, char *argv[], void *userdata) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
-        _cleanup_bus_slot_unref_ sd_bus_slot *slot = NULL;
         _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
+        _cleanup_bus_slot_unref_ sd_bus_slot *slot = NULL;
         _cleanup_event_unref_ sd_event *event = NULL;
-        int master = -1, r, ret = 0;
+        int master = -1, r;
         sd_bus *bus = userdata;
-        const char *pty, *match;
-        char last_char = 0;
-        bool machine_died;
+        const char *pty, *match, *machine;
 
         assert(bus);
 
+        if (!strv_isempty(arg_setenv) || arg_uid) {
+                log_error("--setenv= and --uid= are not supported for 'login'. Use 'shell' instead.");
+                return -EINVAL;
+        }
+
         if (arg_transport != BUS_TRANSPORT_LOCAL &&
             arg_transport != BUS_TRANSPORT_MACHINE) {
                 log_error("Login only supported on local machines.");
@@ -1200,14 +1257,14 @@ static int login_machine(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 
+        machine = argc < 2 || isempty(argv[1]) ? ".host" : argv[1];
+
         match = strjoina("type='signal',"
-                           "sender='org.freedesktop.machine1',"
-                           "path='/org/freedesktop/machine1',",
-                           "interface='org.freedesktop.machine1.Manager',"
-                           "member='MachineRemoved',"
-                           "arg0='",
-                           argv[1],
-                           "'");
+                         "sender='org.freedesktop.machine1',"
+                         "path='/org/freedesktop/machine1',",
+                         "interface='org.freedesktop.machine1.Manager',"
+                         "member='MachineRemoved',"
+                         "arg0='", machine, "'");
 
         r = sd_bus_add_match(bus, &slot, match, on_machine_removed, &forward);
         if (r < 0)
@@ -1221,9 +1278,9 @@ static int login_machine(int argc, char *argv[], void *userdata) {
                         "OpenMachineLogin",
                         &error,
                         &reply,
-                        "s", argv[1]);
+                        "s", machine);
         if (r < 0) {
-                log_error("Failed to get machine PTY: %s", bus_error_message(&error, -r));
+                log_error("Failed to get login PTY: %s", bus_error_message(&error, -r));
                 return r;
         }
 
@@ -1231,36 +1288,100 @@ static int login_machine(int argc, char *argv[], void *userdata) {
         if (r < 0)
                 return bus_log_parse_error(r);
 
-        assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGWINCH, SIGTERM, SIGINT, -1) >= 0);
+        return process_forward(event, &forward, master, true, machine);
+}
 
-        log_info("Connected to machine %s. Press ^] three times within 1s to exit session.", argv[1]);
+static int shell_machine(int argc, char *argv[], void *userdata) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL;
+        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(pty_forward_freep) PTYForward *forward = NULL;
+        _cleanup_bus_slot_unref_ sd_bus_slot *slot = NULL;
+        _cleanup_event_unref_ sd_event *event = NULL;
+        int master = -1, r;
+        sd_bus *bus = userdata;
+        const char *pty, *match, *machine, *path, *uid = NULL;
 
-        sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
-        sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
+        assert(bus);
+
+        if (arg_transport != BUS_TRANSPORT_LOCAL &&
+            arg_transport != BUS_TRANSPORT_MACHINE) {
+                log_error("Shell only supported on local machines.");
+                return -EOPNOTSUPP;
+        }
 
-        r = pty_forward_new(event, master, true, false, &forward);
+        polkit_agent_open_if_enabled();
+
+        r = sd_event_default(&event);
         if (r < 0)
-                return log_error_errno(r, "Failed to create PTY forwarder: %m");
+                return log_error_errno(r, "Failed to get event loop: %m");
 
-        r = sd_event_loop(event);
+        r = sd_bus_attach_event(bus, event, 0);
         if (r < 0)
-                return log_error_errno(r, "Failed to run event loop: %m");
+                return log_error_errno(r, "Failed to attach bus to event loop: %m");
 
-        pty_forward_get_last_char(forward, &last_char);
-        machine_died = pty_forward_get_ignore_vhangup(forward) == 0;
+        machine = argc < 2 || isempty(argv[1]) ? NULL : argv[1];
 
-        forward = pty_forward_free(forward);
+        if (arg_uid)
+                uid = arg_uid;
+        else if (machine) {
+                const char *at;
 
-        if (last_char != '\n')
-                fputc('\n', stdout);
+                at = strchr(machine, '@');
+                if (at) {
+                        uid = strndupa(machine, at - machine);
+                        machine = at + 1;
+                }
+        }
 
-        if (machine_died)
-                log_info("Machine %s terminated.", argv[1]);
-        else
-                log_info("Connection to machine %s terminated.", argv[1]);
+        if (isempty(machine))
+                machine = ".host";
 
-        sd_event_get_exit_code(event, &ret);
-        return ret;
+        match = strjoina("type='signal',"
+                         "sender='org.freedesktop.machine1',"
+                         "path='/org/freedesktop/machine1',",
+                         "interface='org.freedesktop.machine1.Manager',"
+                         "member='MachineRemoved',"
+                         "arg0='", machine, "'");
+
+        r = sd_bus_add_match(bus, &slot, match, on_machine_removed, &forward);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add machine removal match: %m");
+
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        &m,
+                        "org.freedesktop.machine1",
+                        "/org/freedesktop/machine1",
+                        "org.freedesktop.machine1.Manager",
+                        "OpenMachineShell");
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        path = argc < 3 || isempty(argv[2]) ? NULL : argv[2];
+
+        r = sd_bus_message_append(m, "sss", machine, uid, path);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_append_strv(m, strv_length(argv) <= 3 ? NULL : argv + 2);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_message_append_strv(m, arg_setenv);
+        if (r < 0)
+                return bus_log_create_error(r);
+
+        r = sd_bus_call(bus, m, 0, &error, &reply);
+        if (r < 0) {
+                log_error("Failed to get shell PTY: %s", bus_error_message(&error, -r));
+                return r;
+        }
+
+        r = sd_bus_message_read(reply, "hs", &master, &pty);
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        return process_forward(event, &forward, master, false, machine);
 }
 
 static int remove_image(int argc, char *argv[], void *userdata) {
@@ -2314,6 +2435,8 @@ static int help(int argc, char *argv[], void *userdata) {
                "  -l --full                   Do not ellipsize output\n"
                "     --kill-who=WHO           Who to send signal to\n"
                "  -s --signal=SIGNAL          Which signal to send\n"
+               "     --uid=USER               Specify user ID to invoke shell as\n"
+               "     --setenv=VAR=VALUE       Add an environment variable for shell\n"
                "     --read-only              Create read-only bind mount\n"
                "     --mkdir                  Create directory before bind mounting, if missing\n"
                "  -n --lines=INTEGER          Number of journal entries to show\n"
@@ -2328,9 +2451,13 @@ static int help(int argc, char *argv[], void *userdata) {
                "Machine Commands:\n"
                "  list                        List running VMs and containers\n"
                "  status NAME...              Show VM/container details\n"
-               "  show NAME...                Show properties of one or more VMs/containers\n"
+               "  show [NAME...]              Show properties of one or more VMs/containers\n"
                "  start NAME...               Start container as a service\n"
-               "  login NAME                  Get a login prompt on a container\n"
+               "  login [NAME]                Get a login prompt in a container or on the\n"
+               "                              local host\n"
+               "  shell [[USER@]NAME [COMMAND...]]\n"
+               "                              Invoke a shell (or other command) in a container\n"
+               "                              or on the local host\n"
                "  enable NAME...              Enable automatic container start at boot\n"
                "  disable NAME...             Disable automatic container start at boot\n"
                "  poweroff NAME...            Power off one or more containers\n"
@@ -2342,8 +2469,8 @@ static int help(int argc, char *argv[], void *userdata) {
                "  bind NAME PATH [PATH]       Bind mount a path from the host into a container\n\n"
                "Image Commands:\n"
                "  list-images                 Show available container and VM images\n"
-               "  image-status NAME...        Show image details\n"
-               "  show-image NAME...          Show properties of image\n"
+               "  image-status [NAME...]      Show image details\n"
+               "  show-image [NAME...]        Show properties of image\n"
                "  clone NAME NAME             Clone an image\n"
                "  rename NAME NAME            Rename an image\n"
                "  read-only NAME [BOOL]       Mark or unmark image read-only\n"
@@ -2378,6 +2505,8 @@ static int parse_argv(int argc, char *argv[]) {
                 ARG_FORCE,
                 ARG_DKR_INDEX_URL,
                 ARG_FORMAT,
+                ARG_UID,
+                ARG_SETENV,
         };
 
         static const struct option options[] = {
@@ -2402,6 +2531,8 @@ static int parse_argv(int argc, char *argv[]) {
                 { "force",           no_argument,       NULL, ARG_FORCE           },
                 { "dkr-index-url",   required_argument, NULL, ARG_DKR_INDEX_URL   },
                 { "format",          required_argument, NULL, ARG_FORMAT          },
+                { "uid",             required_argument, NULL, ARG_UID             },
+                { "setenv",          required_argument, NULL, ARG_SETENV          },
                 {}
         };
 
@@ -2532,6 +2663,21 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_format = optarg;
                         break;
 
+                case ARG_UID:
+                        arg_uid = optarg;
+                        break;
+
+                case ARG_SETENV:
+                        if (!env_assignment_is_valid(optarg)) {
+                                log_error("Environment assignment invalid: %s", optarg);
+                                return -EINVAL;
+                        }
+
+                        r = strv_extend(&arg_setenv, optarg);
+                        if (r < 0)
+                                return log_oom();
+                        break;
+
                 case '?':
                         return -EINVAL;
 
@@ -2556,7 +2702,8 @@ static int machinectl_main(int argc, char *argv[], sd_bus *bus) {
                 { "reboot",          2,        VERB_ANY, 0,            reboot_machine    },
                 { "poweroff",        2,        VERB_ANY, 0,            poweroff_machine  },
                 { "kill",            2,        VERB_ANY, 0,            kill_machine      },
-                { "login",           2,        2,        0,            login_machine     },
+                { "login",           VERB_ANY, 2,        0,            login_machine     },
+                { "shell",           VERB_ANY, VERB_ANY, 0,            shell_machine     },
                 { "bind",            3,        4,        0,            bind_mount        },
                 { "copy-to",         3,        4,        0,            copy_files        },
                 { "copy-from",       3,        4,        0,            copy_files        },
@@ -2610,6 +2757,7 @@ finish:
         polkit_agent_close();
 
         strv_free(arg_property);
+        strv_free(arg_setenv);
 
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }
diff --git a/src/machine/machined-dbus.c b/src/machine/machined-dbus.c
index 08a7f58ef5..0d52c693e4 100644
--- a/src/machine/machined-dbus.c
+++ b/src/machine/machined-dbus.c
@@ -33,6 +33,7 @@
 #include "btrfs-util.h"
 #include "formats-util.h"
 #include "process-util.h"
+#include "hostname-util.h"
 #include "machine-image.h"
 #include "machine-pool.h"
 #include "image-dbus.h"
@@ -637,6 +638,27 @@ static int method_open_machine_login(sd_bus_message *message, void *userdata, sd
         return bus_machine_method_open_login(message, machine, error);
 }
 
+static int method_open_machine_shell(sd_bus_message *message, void *userdata, sd_bus_error *error) {
+        Manager *m = userdata;
+        Machine *machine;
+        const char *name;
+
+        int r;
+
+        assert(message);
+        assert(m);
+
+        r = sd_bus_message_read(message, "s", &name);
+        if (r < 0)
+                return r;
+
+        machine = hashmap_get(m->machines, name);
+        if (!machine)
+                return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
+
+        return bus_machine_method_open_shell(message, machine, error);
+}
+
 static int method_bind_mount_machine(sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *m = userdata;
         Machine *machine;
@@ -860,6 +882,9 @@ static int method_map_from_machine_user(sd_bus_message *message, void *userdata,
         if (!machine)
                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
 
+        if (machine->class != MACHINE_CONTAINER)
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Not supported for non-container machines.");
+
         p = procfs_file_alloca(machine->leader, "uid_map");
         f = fopen(p, "re");
         if (!f)
@@ -912,6 +937,9 @@ static int method_map_to_machine_user(sd_bus_message *message, void *userdata, s
                 _cleanup_fclose_ FILE *f = NULL;
                 char p[strlen("/proc//uid_map") + DECIMAL_STR_MAX(pid_t) + 1];
 
+                if (machine->class != MACHINE_CONTAINER)
+                        continue;
+
                 xsprintf(p, "/proc/" UID_FMT "/uid_map", machine->leader);
                 f = fopen(p, "re");
                 if (!f) {
@@ -972,6 +1000,9 @@ static int method_map_from_machine_group(sd_bus_message *message, void *groupdat
         if (!machine)
                 return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_MACHINE, "No machine '%s' known", name);
 
+        if (machine->class != MACHINE_CONTAINER)
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Not supported for non-container machines.");
+
         p = procfs_file_alloca(machine->leader, "gid_map");
         f = fopen(p, "re");
         if (!f)
@@ -1024,6 +1055,9 @@ static int method_map_to_machine_group(sd_bus_message *message, void *groupdata,
                 _cleanup_fclose_ FILE *f = NULL;
                 char p[strlen("/proc//gid_map") + DECIMAL_STR_MAX(pid_t) + 1];
 
+                if (machine->class != MACHINE_CONTAINER)
+                        continue;
+
                 xsprintf(p, "/proc/" GID_FMT "/gid_map", machine->leader);
                 f = fopen(p, "re");
                 if (!f) {
@@ -1085,6 +1119,7 @@ const sd_bus_vtable manager_vtable[] = {
         SD_BUS_METHOD("GetMachineOSRelease", "s", "a{ss}", method_get_machine_os_release, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("OpenMachinePTY", "s", "hs", method_open_machine_pty, 0),
         SD_BUS_METHOD("OpenMachineLogin", "s", "hs", method_open_machine_login, SD_BUS_VTABLE_UNPRIVILEGED),
+        SD_BUS_METHOD("OpenMachineShell", "sssasas", "hs", method_open_machine_shell, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("BindMountMachine", "sssbb", NULL, method_bind_mount_machine, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("CopyFromMachine", "sss", NULL, method_copy_machine, SD_BUS_VTABLE_UNPRIVILEGED),
         SD_BUS_METHOD("CopyToMachine", "sss", NULL, method_copy_machine, SD_BUS_VTABLE_UNPRIVILEGED),
@@ -1455,7 +1490,6 @@ int manager_job_is_active(Manager *manager, const char *path) {
 }
 
 int manager_get_machine_by_pid(Manager *m, pid_t pid, Machine **machine) {
-        _cleanup_free_ char *unit = NULL;
         Machine *mm;
         int r;
 
@@ -1463,12 +1497,14 @@ int manager_get_machine_by_pid(Manager *m, pid_t pid, Machine **machine) {
         assert(pid >= 1);
         assert(machine);
 
-        r = cg_pid_get_unit(pid, &unit);
-        if (r < 0)
-                mm = hashmap_get(m->machine_leaders, UINT_TO_PTR(pid));
-        else
-                mm = hashmap_get(m->machine_units, unit);
+        mm = hashmap_get(m->machine_leaders, UINT_TO_PTR(pid));
+        if (!mm) {
+                _cleanup_free_ char *unit = NULL;
 
+                r = cg_pid_get_unit(pid, &unit);
+                if (r >= 0)
+                        mm = hashmap_get(m->machine_units, unit);
+        }
         if (!mm)
                 return 0;
 
@@ -1484,7 +1520,7 @@ int manager_add_machine(Manager *m, const char *name, Machine **_machine) {
 
         machine = hashmap_get(m->machines, name);
         if (!machine) {
-                machine = machine_new(m, name);
+                machine = machine_new(m, _MACHINE_CLASS_INVALID, name);
                 if (!machine)
                         return -ENOMEM;
         }
diff --git a/src/machine/machined.c b/src/machine/machined.c
index c8ad157326..df3cc9972a 100644
--- a/src/machine/machined.c
+++ b/src/machine/machined.c
@@ -30,6 +30,7 @@
 #include "label.h"
 #include "formats-util.h"
 #include "signal-util.h"
+#include "hostname-util.h"
 #include "machine-image.h"
 #include "machined.h"
 
@@ -89,6 +90,45 @@ void manager_free(Manager *m) {
         free(m);
 }
 
+static int manager_add_host_machine(Manager *m) {
+        _cleanup_free_ char *rd = NULL, *unit = NULL;
+        sd_id128_t mid;
+        Machine *t;
+        int r;
+
+        if (m->host_machine)
+                return 0;
+
+        r = sd_id128_get_machine(&mid);
+        if (r < 0)
+                return log_error_errno(r, "Failed to get machine ID: %m");
+
+        rd = strdup("/");
+        if (!rd)
+                return log_oom();
+
+        unit = strdup("-.slice");
+        if (!unit)
+                return log_oom();
+
+        t = machine_new(m, MACHINE_HOST, ".host");
+        if (!t)
+                return log_oom();
+
+        t->leader = 1;
+        t->id = mid;
+
+        t->root_directory = rd;
+        t->unit = unit;
+        rd = unit = NULL;
+
+        dual_timestamp_from_boottime_or_monotonic(&t->timestamp, 0);
+
+        m->host_machine = t;
+
+        return 0;
+}
+
 int manager_enumerate_machines(Manager *m) {
         _cleanup_closedir_ DIR *d = NULL;
         struct dirent *de;
@@ -96,6 +136,10 @@ int manager_enumerate_machines(Manager *m) {
 
         assert(m);
 
+        r = manager_add_host_machine(m);
+        if (r < 0)
+                return r;
+
         /* Read in machine data stored on disk */
         d = opendir("/run/systemd/machines");
         if (!d) {
@@ -117,11 +161,12 @@ int manager_enumerate_machines(Manager *m) {
                 if (startswith(de->d_name, "unit:"))
                         continue;
 
+                if (!machine_name_is_valid(de->d_name))
+                        continue;
+
                 k = manager_add_machine(m, de->d_name, &machine);
                 if (k < 0) {
-                        log_error_errno(k, "Failed to add machine by file name %s: %m", de->d_name);
-
-                        r = k;
+                        r = log_error_errno(k, "Failed to add machine by file name %s: %m", de->d_name);
                         continue;
                 }
 
diff --git a/src/machine/machined.h b/src/machine/machined.h
index 61dbefb5f1..b3e59bf998 100644
--- a/src/machine/machined.h
+++ b/src/machine/machined.h
@@ -48,6 +48,8 @@ struct Manager {
         sd_event_source *image_cache_defer_event;
 
         LIST_HEAD(Machine, machine_gc_queue);
+
+        Machine *host_machine;
 };
 
 Manager *manager_new(void);
diff --git a/src/machine/org.freedesktop.machine1.conf b/src/machine/org.freedesktop.machine1.conf
index d58f01507b..9d40b90151 100644
--- a/src/machine/org.freedesktop.machine1.conf
+++ b/src/machine/org.freedesktop.machine1.conf
@@ -70,6 +70,10 @@
 
                 <allow send_destination="org.freedesktop.machine1"
                        send_interface="org.freedesktop.machine1.Manager"
+                       send_member="OpenMachineShell"/>
+
+                <allow send_destination="org.freedesktop.machine1"
+                       send_interface="org.freedesktop.machine1.Manager"
                        send_member="TerminateMachine"/>
 
                 <allow send_destination="org.freedesktop.machine1"
@@ -142,6 +146,10 @@
 
                 <allow send_destination="org.freedesktop.machine1"
                        send_interface="org.freedesktop.machine1.Machine"
+                       send_member="OpenShell"/>
+
+                <allow send_destination="org.freedesktop.machine1"
+                       send_interface="org.freedesktop.machine1.Machine"
                        send_member="Terminate"/>
 
                 <allow send_destination="org.freedesktop.machine1"
diff --git a/src/machine/org.freedesktop.machine1.policy.in b/src/machine/org.freedesktop.machine1.policy.in
index 02714e83ae..6e35c5c045 100644
--- a/src/machine/org.freedesktop.machine1.policy.in
+++ b/src/machine/org.freedesktop.machine1.policy.in
@@ -26,6 +26,58 @@
                 </defaults>
         </action>
 
+        <action id="org.freedesktop.machine1.host-login">
+                <_description>Log into the local host</_description>
+                <_message>Authentication is required to log into the local host.</_message>
+                <defaults>
+                        <allow_any>auth_admin</allow_any>
+                        <allow_inactive>auth_admin</allow_inactive>
+                        <allow_active>yes</allow_active>
+                </defaults>
+        </action>
+
+        <action id="org.freedesktop.machine1.shell">
+                <_description>Acquire a shell in a local container</_description>
+                <_message>Authentication is required to acquire a shell in a local container.</_message>
+                <defaults>
+                        <allow_any>auth_admin</allow_any>
+                        <allow_inactive>auth_admin</allow_inactive>
+                        <allow_active>auth_admin_keep</allow_active>
+                </defaults>
+                <annotate key="org.freedesktop.policykit.imply">org.freedesktop.login1.login</annotate>
+        </action>
+
+        <action id="org.freedesktop.machine1.host-shell">
+                <_description>Acquire a shell on the local host</_description>
+                <_message>Authentication is required to acquire a shell on the local host.</_message>
+                <defaults>
+                        <allow_any>auth_admin</allow_any>
+                        <allow_inactive>auth_admin</allow_inactive>
+                        <allow_active>auth_admin_keep</allow_active>
+                </defaults>
+                <annotate key="org.freedesktop.policykit.imply">org.freedesktop.login1.host-login</annotate>
+        </action>
+
+        <action id="org.freedesktop.machine1.open-pty">
+                <_description>Acquire a pseudo TTY in a local container</_description>
+                <_message>Authentication is acquire a pseudo TTY in a local container.</_message>
+                <defaults>
+                        <allow_any>auth_admin</allow_any>
+                        <allow_inactive>auth_admin</allow_inactive>
+                        <allow_active>auth_admin_keep</allow_active>
+                </defaults>
+        </action>
+
+        <action id="org.freedesktop.machine1.host-open-pty">
+                <_description>Acquire a pseudo TTY on the local host</_description>
+                <_message>Authentication is acquire a pseudo TTY on the local host.</_message>
+                <defaults>
+                        <allow_any>auth_admin</allow_any>
+                        <allow_inactive>auth_admin</allow_inactive>
+                        <allow_active>auth_admin_keep</allow_active>
+                </defaults>
+        </action>
+
         <action id="org.freedesktop.machine1.manage-machines">
                 <_description>Manage local virtual machines and containers</_description>
                 <_message>Authentication is required to manage local virtual machines and containers.</_message>
@@ -34,6 +86,7 @@
                         <allow_inactive>auth_admin</allow_inactive>
                         <allow_active>auth_admin_keep</allow_active>
                 </defaults>
+                <annotate key="org.freedesktop.policykit.imply">org.freedesktop.login1.shell org.freedesktop.login1.login</annotate>
         </action>
 
         <action id="org.freedesktop.machine1.manage-images">