move remainig shared stuff to shared/

7 files changed, 1335 insertions, 0 deletions

diff --git a/src/shared/ask-password-api.c b/src/shared/ask-password-api.c
new file mode 100644
index 0000000000..55be807cf2
--- /dev/null
+++ b/src/shared/ask-password-api.c
@@ -0,0 +1,577 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+#include <stdbool.h>
+#include <termios.h>
+#include <unistd.h>
+#include <sys/poll.h>
+#include <sys/inotify.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <string.h>
+#include <sys/un.h>
+#include <stddef.h>
+#include <sys/signalfd.h>
+
+#include "util.h"
+#include "mkdir.h"
+#include "strv.h"
+
+#include "ask-password-api.h"
+
+static void backspace_chars(int ttyfd, size_t p) {
+
+        if (ttyfd < 0)
+                return;
+
+        while (p > 0) {
+                p--;
+
+                loop_write(ttyfd, "\b \b", 3, false);
+        }
+}
+
+int ask_password_tty(
+                const char *message,
+                usec_t until,
+                const char *flag_file,
+                char **_passphrase) {
+
+        struct termios old_termios, new_termios;
+        char passphrase[LINE_MAX];
+        size_t p = 0;
+        int r, ttyfd = -1, notify = -1;
+        struct pollfd pollfd[2];
+        bool reset_tty = false;
+        bool silent_mode = false;
+        bool dirty = false;
+        enum {
+                POLL_TTY,
+                POLL_INOTIFY
+        };
+
+        assert(message);
+        assert(_passphrase);
+
+        if (flag_file) {
+                if ((notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
+                        r = -errno;
+                        goto finish;
+                }
+
+                if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
+                        r = -errno;
+                        goto finish;
+                }
+        }
+
+        if ((ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC)) >= 0) {
+
+                if (tcgetattr(ttyfd, &old_termios) < 0) {
+                        r = -errno;
+                        goto finish;
+                }
+
+                loop_write(ttyfd, ANSI_HIGHLIGHT_ON, sizeof(ANSI_HIGHLIGHT_ON)-1, false);
+                loop_write(ttyfd, message, strlen(message), false);
+                loop_write(ttyfd, " ", 1, false);
+                loop_write(ttyfd, ANSI_HIGHLIGHT_OFF, sizeof(ANSI_HIGHLIGHT_OFF)-1, false);
+
+                new_termios = old_termios;
+                new_termios.c_lflag &= ~(ICANON|ECHO);
+                new_termios.c_cc[VMIN] = 1;
+                new_termios.c_cc[VTIME] = 0;
+
+                if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
+                        r = -errno;
+                        goto finish;
+                }
+
+                reset_tty = true;
+        }
+
+        zero(pollfd);
+
+        pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO;
+        pollfd[POLL_TTY].events = POLLIN;
+        pollfd[POLL_INOTIFY].fd = notify;
+        pollfd[POLL_INOTIFY].events = POLLIN;
+
+        for (;;) {
+                char c;
+                int sleep_for = -1, k;
+                ssize_t n;
+
+                if (until > 0) {
+                        usec_t y;
+
+                        y = now(CLOCK_MONOTONIC);
+
+                        if (y > until) {
+                                r = -ETIME;
+                                goto finish;
+                        }
+
+                        sleep_for = (int) ((until - y) / USEC_PER_MSEC);
+                }
+
+                if (flag_file)
+                        if (access(flag_file, F_OK) < 0) {
+                                r = -errno;
+                                goto finish;
+                        }
+
+                if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
+
+                        if (errno == EINTR)
+                                continue;
+
+                        r = -errno;
+                        goto finish;
+                } else if (k == 0) {
+                        r = -ETIME;
+                        goto finish;
+                }
+
+                if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
+                        flush_fd(notify);
+
+                if (pollfd[POLL_TTY].revents == 0)
+                        continue;
+
+                if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) {
+
+                        if (errno == EINTR || errno == EAGAIN)
+                                continue;
+
+                        r = -errno;
+                        goto finish;
+
+                } else if (n == 0)
+                        break;
+
+                if (c == '\n')
+                        break;
+                else if (c == 21) { /* C-u */
+
+                        if (!silent_mode)
+                                backspace_chars(ttyfd, p);
+                        p = 0;
+
+                } else if (c == '\b' || c == 127) {
+
+                        if (p > 0) {
+
+                                if (!silent_mode)
+                                        backspace_chars(ttyfd, 1);
+
+                                p--;
+                        } else if (!dirty && !silent_mode) {
+
+                                silent_mode = true;
+
+                                /* There are two ways to enter silent
+                                 * mode. Either by pressing backspace
+                                 * as first key (and only as first key),
+                                 * or ... */
+                                if (ttyfd >= 0)
+                                        loop_write(ttyfd, "(no echo) ", 10, false);
+
+                        } else if (ttyfd >= 0)
+                                loop_write(ttyfd, "\a", 1, false);
+
+                } else if (c == '\t' && !silent_mode) {
+
+                        backspace_chars(ttyfd, p);
+                        silent_mode = true;
+
+                        /* ... or by pressing TAB at any time. */
+
+                        if (ttyfd >= 0)
+                                loop_write(ttyfd, "(no echo) ", 10, false);
+                } else {
+                        passphrase[p++] = c;
+
+                        if (!silent_mode && ttyfd >= 0)
+                                loop_write(ttyfd, "*", 1, false);
+
+                        dirty = true;
+                }
+        }
+
+        passphrase[p] = 0;
+
+        if (!(*_passphrase = strdup(passphrase))) {
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        r = 0;
+
+finish:
+        if (notify >= 0)
+                close_nointr_nofail(notify);
+
+        if (ttyfd >= 0) {
+
+                if (reset_tty) {
+                        loop_write(ttyfd, "\n", 1, false);
+                        tcsetattr(ttyfd, TCSADRAIN, &old_termios);
+                }
+
+                close_nointr_nofail(ttyfd);
+        }
+
+        return r;
+}
+
+static int create_socket(char **name) {
+        int fd;
+        union {
+                struct sockaddr sa;
+                struct sockaddr_un un;
+        } sa;
+        int one = 1, r;
+        char *c;
+        mode_t u;
+
+        assert(name);
+
+        if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
+                log_error("socket() failed: %m");
+                return -errno;
+        }
+
+        zero(sa);
+        sa.un.sun_family = AF_UNIX;
+        snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%llu", random_ull());
+
+        u = umask(0177);
+        r = bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
+        umask(u);
+
+        if (r < 0) {
+                r = -errno;
+                log_error("bind() failed: %m");
+                goto fail;
+        }
+
+        if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
+                r = -errno;
+                log_error("SO_PASSCRED failed: %m");
+                goto fail;
+        }
+
+        if (!(c = strdup(sa.un.sun_path))) {
+                r = -ENOMEM;
+                log_error("Out of memory");
+                goto fail;
+        }
+
+        *name = c;
+        return fd;
+
+fail:
+        close_nointr_nofail(fd);
+
+        return r;
+}
+
+int ask_password_agent(
+                const char *message,
+                const char *icon,
+                usec_t until,
+                bool accept_cached,
+                char ***_passphrases) {
+
+        enum {
+                FD_SOCKET,
+                FD_SIGNAL,
+                _FD_MAX
+        };
+
+        char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
+        char final[sizeof(temp)] = "";
+        int fd = -1, r;
+        FILE *f = NULL;
+        char *socket_name = NULL;
+        int socket_fd = -1, signal_fd = -1;
+        sigset_t mask, oldmask;
+        struct pollfd pollfd[_FD_MAX];
+        mode_t u;
+
+        assert(_passphrases);
+
+        assert_se(sigemptyset(&mask) == 0);
+        sigset_add_many(&mask, SIGINT, SIGTERM, -1);
+        assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
+
+        mkdir_p("/run/systemd/ask-password", 0755);
+
+        u = umask(0022);
+        fd = mkostemp(temp, O_CLOEXEC|O_CREAT|O_WRONLY);
+        umask(u);
+
+        if (fd < 0) {
+                log_error("Failed to create password file: %m");
+                r = -errno;
+                goto finish;
+        }
+
+        fchmod(fd, 0644);
+
+        if (!(f = fdopen(fd, "w"))) {
+                log_error("Failed to allocate FILE: %m");
+                r = -errno;
+                goto finish;
+        }
+
+        fd = -1;
+
+        if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
+                log_error("signalfd(): %m");
+                r = -errno;
+                goto finish;
+        }
+
+        if ((socket_fd = create_socket(&socket_name)) < 0) {
+                r = socket_fd;
+                goto finish;
+        }
+
+        fprintf(f,
+                "[Ask]\n"
+                "PID=%lu\n"
+                "Socket=%s\n"
+                "AcceptCached=%i\n"
+                "NotAfter=%llu\n",
+                (unsigned long) getpid(),
+                socket_name,
+                accept_cached ? 1 : 0,
+                (unsigned long long) until);
+
+        if (message)
+                fprintf(f, "Message=%s\n", message);
+
+        if (icon)
+                fprintf(f, "Icon=%s\n", icon);
+
+        fflush(f);
+
+        if (ferror(f)) {
+                log_error("Failed to write query file: %m");
+                r = -errno;
+                goto finish;
+        }
+
+        memcpy(final, temp, sizeof(temp));
+
+        final[sizeof(final)-11] = 'a';
+        final[sizeof(final)-10] = 's';
+        final[sizeof(final)-9] = 'k';
+
+        if (rename(temp, final) < 0) {
+                log_error("Failed to rename query file: %m");
+                r = -errno;
+                goto finish;
+        }
+
+        zero(pollfd);
+        pollfd[FD_SOCKET].fd = socket_fd;
+        pollfd[FD_SOCKET].events = POLLIN;
+        pollfd[FD_SIGNAL].fd = signal_fd;
+        pollfd[FD_SIGNAL].events = POLLIN;
+
+        for (;;) {
+                char passphrase[LINE_MAX+1];
+                struct msghdr msghdr;
+                struct iovec iovec;
+                struct ucred *ucred;
+                union {
+                        struct cmsghdr cmsghdr;
+                        uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
+                } control;
+                ssize_t n;
+                int k;
+                usec_t t;
+
+                t = now(CLOCK_MONOTONIC);
+
+                if (until > 0 && until <= t) {
+                        log_notice("Timed out");
+                        r = -ETIME;
+                        goto finish;
+                }
+
+                if ((k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1)) < 0) {
+
+                        if (errno == EINTR)
+                                continue;
+
+                        log_error("poll() failed: %m");
+                        r = -errno;
+                        goto finish;
+                }
+
+                if (k <= 0) {
+                        log_notice("Timed out");
+                        r = -ETIME;
+                        goto finish;
+                }
+
+                if (pollfd[FD_SIGNAL].revents & POLLIN) {
+                        r = -EINTR;
+                        goto finish;
+                }
+
+                if (pollfd[FD_SOCKET].revents != POLLIN) {
+                        log_error("Unexpected poll() event.");
+                        r = -EIO;
+                        goto finish;
+                }
+
+                zero(iovec);
+                iovec.iov_base = passphrase;
+                iovec.iov_len = sizeof(passphrase);
+
+                zero(control);
+                zero(msghdr);
+                msghdr.msg_iov = &iovec;
+                msghdr.msg_iovlen = 1;
+                msghdr.msg_control = &control;
+                msghdr.msg_controllen = sizeof(control);
+
+                if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {
+
+                        if (errno == EAGAIN ||
+                            errno == EINTR)
+                                continue;
+
+                        log_error("recvmsg() failed: %m");
+                        r = -errno;
+                        goto finish;
+                }
+
+                if (n <= 0) {
+                        log_error("Message too short");
+                        continue;
+                }
+
+                if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
+                    control.cmsghdr.cmsg_level != SOL_SOCKET ||
+                    control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
+                    control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
+                        log_warning("Received message without credentials. Ignoring.");
+                        continue;
+                }
+
+                ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
+                if (ucred->uid != 0) {
+                        log_warning("Got request from unprivileged user. Ignoring.");
+                        continue;
+                }
+
+                if (passphrase[0] == '+') {
+                        char **l;
+
+                        if (n == 1)
+                                l = strv_new("", NULL);
+                        else
+                                l = strv_parse_nulstr(passphrase+1, n-1);
+                                /* An empty message refers to the empty password */
+
+                        if (!l) {
+                                r = -ENOMEM;
+                                goto finish;
+                        }
+
+                        if (strv_length(l) <= 0) {
+                                strv_free(l);
+                                log_error("Invalid packet");
+                                continue;
+                        }
+
+                        *_passphrases = l;
+
+                } else if (passphrase[0] == '-') {
+                        r = -ECANCELED;
+                        goto finish;
+                } else {
+                        log_error("Invalid packet");
+                        continue;
+                }
+
+                break;
+        }
+
+        r = 0;
+
+finish:
+        if (fd >= 0)
+                close_nointr_nofail(fd);
+
+        if (socket_name) {
+                unlink(socket_name);
+                free(socket_name);
+        }
+
+        if (socket_fd >= 0)
+                close_nointr_nofail(socket_fd);
+
+        if (signal_fd >= 0)
+                close_nointr_nofail(signal_fd);
+
+        if (f)
+                fclose(f);
+
+        unlink(temp);
+
+        if (final[0])
+                unlink(final);
+
+        assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
+
+        return r;
+}
+
+int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases) {
+        assert(message);
+        assert(_passphrases);
+
+        if (isatty(STDIN_FILENO)) {
+                int r;
+                char *s = NULL, **l = NULL;
+
+                if ((r = ask_password_tty(message, until, NULL, &s)) < 0)
+                        return r;
+
+                l = strv_new(s, NULL);
+                free(s);
+
+                if (!l)
+                        return -ENOMEM;
+
+                *_passphrases = l;
+                return r;
+
+        } else
+                return ask_password_agent(message, icon, until, accept_cached, _passphrases);
+}
diff --git a/src/shared/dbus-loop.c b/src/shared/dbus-loop.c
new file mode 100644
index 0000000000..da0a00443a
--- /dev/null
+++ b/src/shared/dbus-loop.c
@@ -0,0 +1,263 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdbool.h>
+#include <assert.h>
+#include <sys/epoll.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/timerfd.h>
+#include <unistd.h>
+
+#include "dbus-loop.h"
+#include "dbus-common.h"
+#include "util.h"
+
+/* Minimal implementation of the dbus loop which integrates all dbus
+ * events into a single epoll fd which we can triviall integrate with
+ * other loops. Note that this is not used in the main systemd daemon
+ * since we run a more elaborate mainloop there. */
+
+typedef struct EpollData {
+        int fd;
+        void *object;
+        bool is_timeout:1;
+        bool fd_is_dupped:1;
+} EpollData;
+
+static dbus_bool_t add_watch(DBusWatch *watch, void *data) {
+        EpollData *e;
+        struct epoll_event ev;
+
+        assert(watch);
+
+        e = new0(EpollData, 1);
+        if (!e)
+                return FALSE;
+
+        e->fd = dbus_watch_get_unix_fd(watch);
+        e->object = watch;
+        e->is_timeout = false;
+
+        zero(ev);
+        ev.events = bus_flags_to_events(watch);
+        ev.data.ptr = e;
+
+        if (epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_ADD, e->fd, &ev) < 0) {
+
+                if (errno != EEXIST) {
+                        free(e);
+                        return FALSE;
+                }
+
+                /* Hmm, bloody D-Bus creates multiple watches on the
+                 * same fd. epoll() does not like that. As a dirty
+                 * hack we simply dup() the fd and hence get a second
+                 * one we can safely add to the epoll(). */
+
+                e->fd = dup(e->fd);
+                if (e->fd < 0) {
+                        free(e);
+                        return FALSE;
+                }
+
+                if (epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_ADD, e->fd, &ev) < 0) {
+                        close_nointr_nofail(e->fd);
+                        free(e);
+                        return FALSE;
+                }
+
+                e->fd_is_dupped = true;
+        }
+
+        dbus_watch_set_data(watch, e, NULL);
+
+        return TRUE;
+}
+
+static void remove_watch(DBusWatch *watch, void *data) {
+        EpollData *e;
+
+        assert(watch);
+
+        e = dbus_watch_get_data(watch);
+        if (!e)
+                return;
+
+        assert_se(epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_DEL, e->fd, NULL) >= 0);
+
+        if (e->fd_is_dupped)
+                close_nointr_nofail(e->fd);
+
+        free(e);
+}
+
+static void toggle_watch(DBusWatch *watch, void *data) {
+        EpollData *e;
+        struct epoll_event ev;
+
+        assert(watch);
+
+        e = dbus_watch_get_data(watch);
+        if (!e)
+                return;
+
+        zero(ev);
+        ev.events = bus_flags_to_events(watch);
+        ev.data.ptr = e;
+
+        assert_se(epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_MOD, e->fd, &ev) == 0);
+}
+
+static int timeout_arm(EpollData *e) {
+        struct itimerspec its;
+
+        assert(e);
+        assert(e->is_timeout);
+
+        zero(its);
+
+        if (dbus_timeout_get_enabled(e->object)) {
+                timespec_store(&its.it_value, dbus_timeout_get_interval(e->object) * USEC_PER_MSEC);
+                its.it_interval = its.it_value;
+        }
+
+        if (timerfd_settime(e->fd, 0, &its, NULL) < 0)
+                return -errno;
+
+        return 0;
+}
+
+static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data) {
+        EpollData *e;
+        struct epoll_event ev;
+
+        assert(timeout);
+
+        e = new0(EpollData, 1);
+        if (!e)
+                return FALSE;
+
+        e->fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK|TFD_CLOEXEC);
+        if (e->fd < 0)
+                goto fail;
+
+        e->object = timeout;
+        e->is_timeout = true;
+
+        if (timeout_arm(e) < 0)
+                goto fail;
+
+        zero(ev);
+        ev.events = EPOLLIN;
+        ev.data.ptr = e;
+
+        if (epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_ADD, e->fd, &ev) < 0)
+                goto fail;
+
+        dbus_timeout_set_data(timeout, e, NULL);
+
+        return TRUE;
+
+fail:
+        if (e->fd >= 0)
+                close_nointr_nofail(e->fd);
+
+        free(e);
+        return FALSE;
+}
+
+static void remove_timeout(DBusTimeout *timeout, void *data) {
+        EpollData *e;
+
+        assert(timeout);
+
+        e = dbus_timeout_get_data(timeout);
+        if (!e)
+                return;
+
+        assert_se(epoll_ctl(PTR_TO_INT(data), EPOLL_CTL_DEL, e->fd, NULL) >= 0);
+        close_nointr_nofail(e->fd);
+        free(e);
+}
+
+static void toggle_timeout(DBusTimeout *timeout, void *data) {
+        EpollData *e;
+        int r;
+
+        assert(timeout);
+
+        e = dbus_timeout_get_data(timeout);
+        if (!e)
+                return;
+
+        r = timeout_arm(e);
+        if (r < 0)
+                log_error("Failed to rearm timer: %s", strerror(-r));
+}
+
+int bus_loop_open(DBusConnection *c) {
+        int fd;
+
+        assert(c);
+
+        fd = epoll_create1(EPOLL_CLOEXEC);
+        if (fd < 0)
+                return -errno;
+
+        if (!dbus_connection_set_watch_functions(c, add_watch, remove_watch, toggle_watch, INT_TO_PTR(fd), NULL) ||
+            !dbus_connection_set_timeout_functions(c, add_timeout, remove_timeout, toggle_timeout, INT_TO_PTR(fd), NULL)) {
+                close_nointr_nofail(fd);
+                return -ENOMEM;
+        }
+
+        return fd;
+}
+
+int bus_loop_dispatch(int fd) {
+        int n;
+        struct epoll_event event;
+        EpollData *d;
+
+        assert(fd >= 0);
+
+        zero(event);
+
+        n = epoll_wait(fd, &event, 1, 0);
+        if (n < 0)
+                return errno == EAGAIN || errno == EINTR ? 0 : -errno;
+
+        assert_se(d = event.data.ptr);
+
+        if (d->is_timeout) {
+                DBusTimeout *t = d->object;
+
+                if (dbus_timeout_get_enabled(t))
+                        dbus_timeout_handle(t);
+        } else {
+                DBusWatch *w = d->object;
+
+                if (dbus_watch_get_enabled(w))
+                        dbus_watch_handle(w, bus_events_to_flags(event.events));
+        }
+
+        return 0;
+}
diff --git a/src/shared/dbus-loop.h b/src/shared/dbus-loop.h
new file mode 100644
index 0000000000..3902b354cf
--- /dev/null
+++ b/src/shared/dbus-loop.h
@@ -0,0 +1,30 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foodbusloophfoo
+#define foodbusloophfoo
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <dbus/dbus.h>
+
+int bus_loop_open(DBusConnection *c);
+int bus_loop_dispatch(int fd);
+
+#endif
diff --git a/src/shared/def.h b/src/shared/def.h
new file mode 100644
index 0000000000..be969fca2e
--- /dev/null
+++ b/src/shared/def.h
@@ -0,0 +1,37 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foodefhfoo
+#define foodefhfoo
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "util.h"
+
+#define DEFAULT_TIMEOUT_USEC (90*USEC_PER_SEC)
+#define DEFAULT_RESTART_USEC (100*USEC_PER_MSEC)
+
+#define DEFAULT_EXIT_USEC (5*USEC_PER_MINUTE)
+
+#define SYSTEMD_CGROUP_CONTROLLER "name=systemd"
+
+#define SIGNALS_CRASH_HANDLER SIGSEGV,SIGILL,SIGFPE,SIGBUS,SIGQUIT,SIGABRT
+#define SIGNALS_IGNORE SIGKILL,SIGPIPE
+
+#endif
diff --git a/src/shared/missing.h b/src/shared/missing.h
new file mode 100644
index 0000000000..5951e06cfc
--- /dev/null
+++ b/src/shared/missing.h
@@ -0,0 +1,187 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foomissinghfoo
+#define foomissinghfoo
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+/* Missing glibc definitions to access certain kernel APIs */
+
+#include <sys/resource.h>
+#include <sys/syscall.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/oom.h>
+
+#ifdef HAVE_AUDIT
+#include <libaudit.h>
+#endif
+
+#include "macro.h"
+
+#ifdef ARCH_MIPS
+#include <asm/sgidefs.h>
+#endif
+
+#ifndef RLIMIT_RTTIME
+#define RLIMIT_RTTIME 15
+#endif
+
+#ifndef F_LINUX_SPECIFIC_BASE
+#define F_LINUX_SPECIFIC_BASE 1024
+#endif
+
+#ifndef F_SETPIPE_SZ
+#define F_SETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 7)
+#endif
+
+#ifndef F_GETPIPE_SZ
+#define F_GETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 8)
+#endif
+
+#ifndef IP_FREEBIND
+#define IP_FREEBIND 15
+#endif
+
+#ifndef OOM_SCORE_ADJ_MIN
+#define OOM_SCORE_ADJ_MIN (-1000)
+#endif
+
+#ifndef OOM_SCORE_ADJ_MAX
+#define OOM_SCORE_ADJ_MAX 1000
+#endif
+
+#ifndef AUDIT_SERVICE_START
+#define AUDIT_SERVICE_START 1130 /* Service (daemon) start */
+#endif
+
+#ifndef AUDIT_SERVICE_STOP
+#define AUDIT_SERVICE_STOP 1131 /* Service (daemon) stop */
+#endif
+
+#ifndef TIOCVHANGUP
+#define TIOCVHANGUP 0x5437
+#endif
+
+#ifndef IP_TRANSPARENT
+#define IP_TRANSPARENT 19
+#endif
+
+static inline int pivot_root(const char *new_root, const char *put_old) {
+        return syscall(SYS_pivot_root, new_root, put_old);
+}
+
+#ifdef __x86_64__
+#  ifndef __NR_fanotify_init
+#    define __NR_fanotify_init 300
+#  endif
+#  ifndef __NR_fanotify_mark
+#    define __NR_fanotify_mark 301
+#  endif
+#elif defined _MIPS_SIM
+#  if _MIPS_SIM == _MIPS_SIM_ABI32
+#    ifndef __NR_fanotify_init
+#      define __NR_fanotify_init 4336
+#    endif
+#    ifndef __NR_fanotify_mark
+#      define __NR_fanotify_mark 4337
+#    endif
+#  elif _MIPS_SIM == _MIPS_SIM_NABI32
+#    ifndef __NR_fanotify_init
+#      define __NR_fanotify_init 6300
+#    endif
+#    ifndef __NR_fanotify_mark
+#      define __NR_fanotify_mark 6301
+#    endif
+#  elif _MIPS_SIM == _MIPS_SIM_ABI64
+#    ifndef __NR_fanotify_init
+#      define __NR_fanotify_init 5295
+#    endif
+#    ifndef __NR_fanotify_mark
+#      define __NR_fanotify_mark 5296
+#    endif
+#  endif
+#else
+#  ifndef __NR_fanotify_init
+#    define __NR_fanotify_init 338
+#  endif
+#  ifndef __NR_fanotify_mark
+#    define __NR_fanotify_mark 339
+#  endif
+#endif
+
+static inline int fanotify_init(unsigned int flags, unsigned int event_f_flags) {
+        return syscall(__NR_fanotify_init, flags, event_f_flags);
+}
+
+static inline int fanotify_mark(int fanotify_fd, unsigned int flags, uint64_t mask,
+                                int dfd, const char *pathname) {
+#if defined _MIPS_SIM && _MIPS_SIM == _MIPS_SIM_ABI32
+        union {
+                uint64_t _64;
+                uint32_t _32[2];
+        } _mask;
+        _mask._64 = mask;
+
+        return syscall(__NR_fanotify_mark, fanotify_fd, flags,
+                       _mask._32[0], _mask._32[1], dfd, pathname);
+#else
+        return syscall(__NR_fanotify_mark, fanotify_fd, flags, mask, dfd, pathname);
+#endif
+}
+
+#ifndef BTRFS_IOCTL_MAGIC
+#define BTRFS_IOCTL_MAGIC 0x94
+#endif
+
+#ifndef BTRFS_PATH_NAME_MAX
+#define BTRFS_PATH_NAME_MAX 4087
+#endif
+
+struct btrfs_ioctl_vol_args {
+        int64_t fd;
+        char name[BTRFS_PATH_NAME_MAX + 1];
+};
+
+#ifndef BTRFS_IOC_DEFRAG
+#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, struct btrfs_ioctl_vol_args)
+#endif
+
+#ifndef BTRFS_SUPER_MAGIC
+#define BTRFS_SUPER_MAGIC 0x9123683E
+#endif
+
+#ifndef MS_MOVE
+#define MS_MOVE 8192
+#endif
+
+#ifndef MS_PRIVATE
+#define MS_PRIVATE  (1 << 18)
+#endif
+
+static inline pid_t gettid(void) {
+        return (pid_t) syscall(SYS_gettid);
+}
+
+#ifndef SCM_SECURITY
+#define SCM_SECURITY 0x03
+#endif
+
+#endif
diff --git a/src/shared/polkit.c b/src/shared/polkit.c
new file mode 100644
index 0000000000..07d18e7d5f
--- /dev/null
+++ b/src/shared/polkit.c
@@ -0,0 +1,205 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/types.h>
+
+#include <errno.h>
+
+#include "util.h"
+#include "dbus-common.h"
+#include "polkit.h"
+
+/* This mimics dbus_bus_get_unix_user() */
+static pid_t get_unix_process_id(
+                DBusConnection *connection,
+                const char *name,
+                DBusError *error) {
+
+        DBusMessage *m = NULL, *reply = NULL;
+        uint32_t pid = 0;
+
+        m = dbus_message_new_method_call(
+                        DBUS_SERVICE_DBUS,
+                        DBUS_PATH_DBUS,
+                        DBUS_INTERFACE_DBUS,
+                        "GetConnectionUnixProcessID");
+        if (!m) {
+                dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
+                goto finish;
+        }
+
+        if (!dbus_message_append_args(
+                            m,
+                            DBUS_TYPE_STRING, &name,
+                            DBUS_TYPE_INVALID)) {
+                dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
+                goto finish;
+        }
+
+        reply = dbus_connection_send_with_reply_and_block(connection, m, -1, error);
+        if (!reply)
+                goto finish;
+
+        if (dbus_set_error_from_message(error, reply))
+                goto finish;
+
+        if (!dbus_message_get_args(
+                            reply, error,
+                            DBUS_TYPE_UINT32, &pid,
+                            DBUS_TYPE_INVALID))
+                goto finish;
+
+finish:
+        if (m)
+                dbus_message_unref(m);
+
+        if (reply)
+                dbus_message_unref(reply);
+
+        return (pid_t) pid;
+}
+
+int verify_polkit(
+                DBusConnection *c,
+                DBusMessage *request,
+                const char *action,
+                bool interactive,
+                bool *_challenge,
+                DBusError *error) {
+
+        DBusMessage *m = NULL, *reply = NULL;
+        const char *unix_process = "unix-process", *pid = "pid", *starttime = "start-time", *cancel_id = "";
+        const char *sender;
+        uint32_t flags = interactive ? 1 : 0;
+        pid_t pid_raw;
+        uint32_t pid_u32;
+        unsigned long long starttime_raw;
+        uint64_t starttime_u64;
+        DBusMessageIter iter_msg, iter_struct, iter_array, iter_dict, iter_variant;
+        int r;
+        dbus_bool_t authorized = FALSE, challenge = FALSE;
+
+        assert(c);
+        assert(request);
+
+        sender = dbus_message_get_sender(request);
+        if (!sender)
+                return -EINVAL;
+
+        pid_raw = get_unix_process_id(c, sender, error);
+        if (pid_raw == 0)
+                return -EINVAL;
+
+        r = get_starttime_of_pid(pid_raw, &starttime_raw);
+        if (r < 0)
+                return r;
+
+        m = dbus_message_new_method_call(
+                        "org.freedesktop.PolicyKit1",
+                        "/org/freedesktop/PolicyKit1/Authority",
+                        "org.freedesktop.PolicyKit1.Authority",
+                        "CheckAuthorization");
+        if (!m)
+                return -ENOMEM;
+
+        dbus_message_iter_init_append(m, &iter_msg);
+
+        pid_u32 = (uint32_t) pid_raw;
+        starttime_u64 = (uint64_t) starttime_raw;
+
+        if (!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_STRUCT, NULL, &iter_struct) ||
+            !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &unix_process) ||
+            !dbus_message_iter_open_container(&iter_struct, DBUS_TYPE_ARRAY, "{sv}", &iter_array) ||
+            !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
+            !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &pid) ||
+            !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "u", &iter_variant) ||
+            !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT32, &pid_u32) ||
+            !dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
+            !dbus_message_iter_close_container(&iter_array, &iter_dict) ||
+            !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
+            !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &starttime) ||
+            !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "t", &iter_variant) ||
+            !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT64, &starttime_u64) ||
+            !dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
+            !dbus_message_iter_close_container(&iter_array, &iter_dict) ||
+            !dbus_message_iter_close_container(&iter_struct, &iter_array) ||
+            !dbus_message_iter_close_container(&iter_msg, &iter_struct) ||
+            !dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &action) ||
+            !dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_ARRAY, "{ss}", &iter_array) ||
+            !dbus_message_iter_close_container(&iter_msg, &iter_array) ||
+            !dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_UINT32, &flags) ||
+            !dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &cancel_id)) {
+                r = -ENOMEM;
+                goto finish;
+        }
+
+        reply = dbus_connection_send_with_reply_and_block(c, m, -1, error);
+        if (!reply) {
+                r = -EIO;
+                goto finish;
+        }
+
+        if (dbus_set_error_from_message(error, reply)) {
+                r = -EIO;
+                goto finish;
+        }
+
+        if (!dbus_message_iter_init(reply, &iter_msg) ||
+            dbus_message_iter_get_arg_type(&iter_msg) != DBUS_TYPE_STRUCT) {
+                r = -EIO;
+                goto finish;
+        }
+
+        dbus_message_iter_recurse(&iter_msg, &iter_struct);
+
+        if (dbus_message_iter_get_arg_type(&iter_struct) != DBUS_TYPE_BOOLEAN) {
+                r = -EIO;
+                goto finish;
+        }
+
+        dbus_message_iter_get_basic(&iter_struct, &authorized);
+
+        if (!dbus_message_iter_next(&iter_struct) ||
+            dbus_message_iter_get_arg_type(&iter_struct) != DBUS_TYPE_BOOLEAN) {
+                r = -EIO;
+                goto finish;
+        }
+
+        dbus_message_iter_get_basic(&iter_struct, &challenge);
+
+        if (authorized)
+                r = 1;
+        else if (_challenge) {
+                *_challenge = !!challenge;
+                r = 0;
+        } else
+                r = -EPERM;
+
+finish:
+
+        if (m)
+                dbus_message_unref(m);
+
+        if (reply)
+                dbus_message_unref(reply);
+
+        return r;
+}
diff --git a/src/shared/polkit.h b/src/shared/polkit.h
new file mode 100644
index 0000000000..5aecfff635
--- /dev/null
+++ b/src/shared/polkit.h
@@ -0,0 +1,36 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foopolkithfoo
+#define foopolkithfoo
+
+/***
+  This file is part of systemd.
+
+  Copyright 2010 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdbool.h>
+#include <dbus/dbus.h>
+
+int verify_polkit(
+                DBusConnection *c,
+                DBusMessage *request,
+                const char *action,
+                bool interactive,
+                bool *challenge,
+                DBusError *error);
+
+#endif