Merge pull request #16915 from poettering/cryptsetup-dlopen

pid1,repart,growfs: make libcryptsetup a dlopen() style dep

TODO

@@ -91,8 +91,7 @@ Features:
     - elfutils (always)
     - p11-kit-trust (always)
     - kmod-libs (only when called from PID 1)
-    - cryptsetup-libs (only in RootImage= handling in PID 1, but not in systemd-cryptsetup)
+    - libblkid (only in RootImage= handling in PID 1, but not elsewhere)
-    - similar: libblkid
     - libpam (only when called from PID 1)
     - bzip2, xz, lz4 (always — gzip and zstd should probably stay static deps the way they are,
       since they are so basic and our defaults)

meson.build

@@ -2272,8 +2272,8 @@ executable(
 if conf.get('HAVE_LIBCRYPTSETUP') == 1
         systemd_cryptsetup_sources = files('''
                 src/cryptsetup/cryptsetup-pkcs11.h
-                src/cryptsetup/cryptsetup-util.c
+                src/cryptsetup/cryptsetup-keyfile.c
-                src/cryptsetup/cryptsetup-util.h
+                src/cryptsetup/cryptsetup-keyfile.h
                 src/cryptsetup/cryptsetup.c
 '''.split())
 
@@ -2297,7 +2297,6 @@ if conf.get('HAVE_LIBCRYPTSETUP') == 1
                 'src/cryptsetup/cryptsetup-generator.c',
                 include_directories : includes,
                 link_with : [libshared],
-                dependencies : [libcryptsetup],
                 install_rpath : rootlibexecdir,
                 install : true,
                 install_dir : systemgeneratordir)
@@ -2317,7 +2316,6 @@ if conf.get('HAVE_LIBCRYPTSETUP') == 1
                 'src/veritysetup/veritysetup-generator.c',
                 include_directories : includes,
                 link_with : [libshared],
-                dependencies : [libcryptsetup],
                 install_rpath : rootlibexecdir,
                 install : true,
                 install_dir : systemgeneratordir)
@@ -2672,7 +2670,6 @@ if conf.get('ENABLE_REPART') == 1
                 include_directories : includes,
                 link_with : [libshared],
                 dependencies : [threads,
-                                libcryptsetup,
                                 libblkid,
                                 libfdisk,
                                 libopenssl],
@@ -2755,7 +2752,6 @@ executable('systemd-growfs',
            'src/partition/growfs.c',
            include_directories : includes,
            link_with : [libshared],
-           dependencies : [libcryptsetup],
            install_rpath : rootlibexecdir,
            install : true,
            install_dir : rootlibexecdir)

src/basic/selinux-util.c

@@ -35,14 +35,17 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free);
 static int mac_selinux_reload(int seqno);
 
 static int cached_use = -1;
+static bool initialized = false;
+static int (*enforcing_status_func)(void) = security_getenforce;
+static int last_policyload = 0;
 static struct selabel_handle *label_hnd = NULL;
 
 #define log_enforcing(...)                                              \
-        log_full(security_getenforce() != 0 ? LOG_ERR : LOG_WARNING, __VA_ARGS__)
+        log_full(mac_selinux_enforcing() ? LOG_ERR : LOG_WARNING, __VA_ARGS__)
 
 #define log_enforcing_errno(error, ...)                                 \
         ({                                                              \
-                bool _enforcing = security_getenforce() != 0;           \
+                bool _enforcing = mac_selinux_enforcing();              \
                 int _level = _enforcing ? LOG_ERR : LOG_WARNING;        \
                 int _e = (error);                                       \
                                                                         \
@@ -66,32 +69,33 @@ bool mac_selinux_use(void) {
 #endif
 }
 
+bool mac_selinux_enforcing(void) {
+#if HAVE_SELINUX
+        return enforcing_status_func() != 0;
+#else
+        return false;
+#endif
+}
+
 void mac_selinux_retest(void) {
 #if HAVE_SELINUX
         cached_use = -1;
 #endif
 }
 
-int mac_selinux_init(void) {
 #if HAVE_SELINUX
+static int open_label_db(void) {
+        struct selabel_handle *hnd;
         usec_t before_timestamp, after_timestamp;
         struct mallinfo before_mallinfo, after_mallinfo;
         char timespan[FORMAT_TIMESPAN_MAX];
         int l;
 
-        selinux_set_callback(SELINUX_CB_POLICYLOAD, (union selinux_callback) mac_selinux_reload);
-
-        if (label_hnd)
-                return 0;
-
-        if (!mac_selinux_use())
-                return 0;
-
         before_mallinfo = mallinfo();
         before_timestamp = now(CLOCK_MONOTONIC);
 
-        label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+        hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
-        if (!label_hnd)
+        if (!hnd)
                 return log_enforcing_errno(errno, "Failed to initialize SELinux labeling handle: %m");
 
         after_timestamp = now(CLOCK_MONOTONIC);
@@ -103,37 +107,94 @@ int mac_selinux_init(void) {
                   format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0),
                   (l+1023)/1024);
 
+        /* release memory after measurement */
+        if (label_hnd)
+                selabel_close(label_hnd);
+        label_hnd = TAKE_PTR(hnd);
+
+        return 0;
+}
+#endif
+
+int mac_selinux_init(void) {
+#if HAVE_SELINUX
+        int r;
+
+        if (initialized)
+                return 0;
+
+        if (!mac_selinux_use())
+                return 0;
+
+        r = selinux_status_open(/* no netlink fallback */ 0);
+        if (r < 0)
+                return log_enforcing_errno(errno, "Failed to open SELinux status page: %m");
+
+        r = open_label_db();
+        if (r < 0) {
+                selinux_status_close();
+                return r;
+        }
+
+        /* save the current policyload sequence number, so `mac_selinux_maybe_reload()` does
+           not trigger on first call without any actual change */
+        last_policyload = selinux_status_policyload();
+
+        /* now that the SELinux status page has been successfully opened,
+           retrieve the enforcing status over it (to avoid system calls in `security_getenforce()`) */
+        enforcing_status_func = selinux_status_getenforce;
+
+        initialized = true;
 #endif
         return 0;
 }
 
+void mac_selinux_maybe_reload(void) {
+#if HAVE_SELINUX
+        int r;
+
+        r = selinux_status_updated();
+        if (r < 0)
+                log_debug_errno(errno, "Failed to update SELinux from status page: %m");
+        if (r > 0) {
+                int policyload;
+
+                log_debug("SELinux status page update");
+
+                /* from libselinux > 3.1 callbacks gets automatically called, see
+                   https://github.com/SELinuxProject/selinux/commit/05bdc03130d741e53e1fb45a958d0a2c184be503 */
+
+                /* only reload on policy changes, not enforcing status changes */
+                policyload = selinux_status_policyload();
+                if (policyload != last_policyload) {
+                        mac_selinux_reload(policyload);
+                        last_policyload = policyload;
+                }
+        }
+#endif
+}
+
 void mac_selinux_finish(void) {
 
 #if HAVE_SELINUX
-        if (!label_hnd)
+        if (label_hnd) {
-                return;
+                selabel_close(label_hnd);
+                label_hnd = NULL;
+        }
 
-        selabel_close(label_hnd);
+        enforcing_status_func = security_getenforce;
-        label_hnd = NULL;
+
+        selinux_status_close();
+
+        initialized = false;
 #endif
 }
 
 #if HAVE_SELINUX
 static int mac_selinux_reload(int seqno) {
-        struct selabel_handle *backup_label_hnd;
+        log_debug("SELinux reload %d", seqno);
 
-        if (!label_hnd)
+        (void) open_label_db();
-                return 0;
-
-        backup_label_hnd = TAKE_PTR(label_hnd);
-
-        /* try to initialize new handle
-         *    on success close backup
-         *    on failure restore backup */
-        if (mac_selinux_init() == 0)
-                selabel_close(backup_label_hnd);
-        else
-                label_hnd = backup_label_hnd;
 
         return 0;
 }
@@ -167,7 +228,7 @@ int mac_selinux_fix_container(const char *path, const char *inside_path, LabelFi
                 return -errno;
 
         /* Check for policy reload so 'label_hnd' is kept up-to-date by callbacks */
-        (void) avc_netlink_check_nb();
+        mac_selinux_maybe_reload();
 
         if (selabel_lookup_raw(label_hnd, &fcon, inside_path, st.st_mode) < 0) {
                 r = -errno;
@@ -363,7 +424,7 @@ static int selinux_create_file_prepare_abspath(const char *abspath, mode_t mode)
         assert(path_is_absolute(abspath));
 
         /* Check for policy reload so 'label_hnd' is kept up-to-date by callbacks */
-        (void) avc_netlink_check_nb();
+        mac_selinux_maybe_reload();
 
         r = selabel_lookup_raw(label_hnd, &filecon, abspath, mode);
         if (r < 0) {
@@ -507,7 +568,7 @@ int mac_selinux_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
         path = strndupa(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
 
         /* Check for policy reload so 'label_hnd' is kept up-to-date by callbacks */
-        (void) avc_netlink_check_nb();
+        mac_selinux_maybe_reload();
 
         if (path_is_absolute(path))
                 r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK);

src/basic/selinux-util.h

@@ -17,8 +17,10 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(char*, freecon);
 
 bool mac_selinux_use(void);
 void mac_selinux_retest(void);
+bool mac_selinux_enforcing(void);
 
 int mac_selinux_init(void);
+void mac_selinux_maybe_reload(void);
 void mac_selinux_finish(void);
 
 int mac_selinux_fix_container(const char *path, const char *inside_path, LabelFixFlags flags);

src/core/execute.c

@@ -4599,6 +4599,10 @@ int exec_spawn(Unit *unit,
         if (!line)
                 return log_oom();
 
+        /* fork with up-to-date SELinux label database, so the child inherits the up-to-date db
+           and, until the next SELinux policy changes, we safe further reloads in future children */
+        mac_selinux_maybe_reload();
+
         log_struct(LOG_DEBUG,
                    LOG_UNIT_MESSAGE(unit, "About to execute: %s", line),
                    "EXECUTABLE=%s", command->path,

src/core/selinux-access.c

@@ -198,7 +198,7 @@ int mac_selinux_generic_access_check(
                 return r;
 
         /* delay call until we checked in `access_init()` if SELinux is actually enabled */
-        enforce = security_getenforce() != 0;
+        enforce = mac_selinux_enforcing();
 
         r = sd_bus_query_sender_creds(
                         message,
@@ -278,7 +278,7 @@ int mac_selinux_generic_access_check(
         return enforce ? r : 0;
 }
 
-#else
+#else /* HAVE_SELINUX */
 
 int mac_selinux_generic_access_check(
                 sd_bus_message *message,
@@ -289,4 +289,4 @@ int mac_selinux_generic_access_check(
         return 0;
 }
 
-#endif
+#endif /* HAVE_SELINUX */

src/core/socket.c

@@ -18,6 +18,7 @@
 #include "dbus-socket.h"
 #include "dbus-unit.h"
 #include "def.h"
+#include "errno-list.h"
 #include "exit-status.h"
 #include "fd-util.h"
 #include "format-util.h"
@@ -206,27 +207,6 @@ static int socket_arm_timer(Socket *s, usec_t usec) {
         return 0;
 }
 
-static int socket_instantiate_service(Socket *s, int cfd) {
-        Unit *service;
-        int r;
-
-        assert(s);
-        assert(cfd >= 0);
-
-        /* This fills in s->service if it isn't filled in yet. For Accept=yes sockets we create the next
-         * connection service here. For Accept=no this is mostly a NOP since the service is figured out at
-         * load time anyway. */
-
-        r = socket_load_service_unit(s, cfd, &service);
-        if (r < 0)
-                return r;
-
-        unit_ref_set(&s->service, UNIT(s), service);
-
-        return unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
-                                         false, UNIT_DEPENDENCY_IMPLICIT);
-}
-
 static bool have_non_accept_socket(Socket *s) {
         SocketPort *p;
 
@@ -1424,11 +1404,12 @@ int socket_load_service_unit(Socket *s, int cfd, Unit **ret) {
 
         if (cfd >= 0) {
                 r = instance_from_socket(cfd, s->n_accepted, &instance);
-                if (r == -ENOTCONN)
+                if (ERRNO_IS_DISCONNECT(r))
-                        /* ENOTCONN is legitimate if TCP RST was received.
+                        /* ENOTCONN is legitimate if TCP RST was received. Other socket families might return
-                         * This connection is over, but the socket unit lives on. */
+                         * different errors. This connection is over, but the socket unit lives on. */
                         return log_unit_debug_errno(UNIT(s), r,
-                                                    "Got ENOTCONN on incoming socket, assuming aborted connection attempt, ignoring.");
+                                                    "Got %s on incoming socket, assuming aborted connection attempt, ignoring.",
+                                                    errno_to_name(r));
                 if (r < 0)
                         return r;
         }
@@ -2326,13 +2307,14 @@ static void flush_ports(Socket *s) {
         }
 }
 
-static void socket_enter_running(Socket *s, int cfd) {
+static void socket_enter_running(Socket *s, int cfd_in) {
+        /* Note that this call takes possession of the connection fd passed. It either has to assign it
+         * somewhere or close it. */
+        _cleanup_close_ int cfd = cfd_in;
+
         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         int r;
 
-        /* Note that this call takes possession of the connection fd passed. It either has to assign it somewhere or
-         * close it. */
-
         assert(s);
 
         /* We don't take connections anymore if we are supposed to shut down anyway */
@@ -2342,9 +2324,8 @@ static void socket_enter_running(Socket *s, int cfd) {
 
                 if (cfd >= 0)
                         goto refuse;
-                else
-                        flush_ports(s);
 
+                flush_ports(s);
                 return;
         }
 
@@ -2370,8 +2351,8 @@ static void socket_enter_running(Socket *s, int cfd) {
 
                 if (!pending) {
                         if (!UNIT_ISSET(s->service)) {
-                                log_unit_error(UNIT(s), "Service to activate vanished, refusing activation.");
+                                r = log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(ENOENT),
-                                r = -ENOENT;
+                                                         "Service to activate vanished, refusing activation.");
                                 goto fail;
                         }
 
@@ -2383,7 +2364,7 @@ static void socket_enter_running(Socket *s, int cfd) {
                 socket_set_state(s, SOCKET_RUNNING);
         } else {
                 _cleanup_(socket_peer_unrefp) SocketPeer *p = NULL;
-                Service *service;
+                Unit *service;
 
                 if (s->n_connections >= s->max_connections) {
                         log_unit_warning(UNIT(s), "Too many incoming connections (%u), dropping connection.",
@@ -2393,8 +2374,10 @@ static void socket_enter_running(Socket *s, int cfd) {
 
                 if (s->max_connections_per_source > 0) {
                         r = socket_acquire_peer(s, cfd, &p);
-                        if (r < 0)
+                        if (ERRNO_IS_DISCONNECT(r))
-                                goto refuse;
+                                return;
+                        if (r < 0) /* We didn't have enough resources to acquire peer information, let's fail. */
+                                goto fail;
                         if (r > 0 && p->n_ref > s->max_connections_per_source) {
                                 _cleanup_free_ char *t = NULL;
 
@@ -2407,29 +2390,35 @@ static void socket_enter_running(Socket *s, int cfd) {
                         }
                 }
 
-                r = socket_instantiate_service(s, cfd);
+                r = socket_load_service_unit(s, cfd, &service);
+                if (ERRNO_IS_DISCONNECT(r))
+                        return;
                 if (r < 0)
                         goto fail;
 
-                service = SERVICE(UNIT_DEREF(s->service));
+                r = unit_add_two_dependencies(UNIT(s), UNIT_BEFORE, UNIT_TRIGGERS, service,
-                unit_ref_unset(&s->service);
+                                              false, UNIT_DEPENDENCY_IMPLICIT);
+                if (r < 0)
+                        goto fail;
 
                 s->n_accepted++;
 
-                r = service_set_socket_fd(service, cfd, s, s->selinux_context_from_net);
+                r = service_set_socket_fd(SERVICE(service), cfd, s, s->selinux_context_from_net);
+                if (ERRNO_IS_DISCONNECT(r))
+                        return;
                 if (r < 0)
                         goto fail;
 
                 TAKE_FD(cfd); /* We passed ownership of the fd to the service now. Forget it here. */
                 s->n_connections++;
 
-                service->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
+                SERVICE(service)->peer = TAKE_PTR(p); /* Pass ownership of the peer reference */
 
-                r = manager_add_job(UNIT(s)->manager, JOB_START, UNIT(service), JOB_REPLACE, NULL, &error, NULL);
+                r = manager_add_job(UNIT(s)->manager, JOB_START, service, JOB_REPLACE, NULL, &error, NULL);
                 if (r < 0) {
                         /* We failed to activate the new service, but it still exists. Let's make sure the
                          * service closes and forgets the connection fd again, immediately. */
-                        service_close_socket_fd(service);
+                        service_close_socket_fd(SERVICE(service));
                         goto fail;
                 }
 
@@ -2437,20 +2426,23 @@ static void socket_enter_running(Socket *s, int cfd) {
                 unit_add_to_dbus_queue(UNIT(s));
         }
 
+        TAKE_FD(cfd);
         return;
 
 refuse:
         s->n_refused++;
-        safe_close(cfd);
         return;
 
 fail:
-        log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
+        if (ERRNO_IS_RESOURCE(r))
-                         cfd >= 0 ? "template" : "non-template",
+                log_unit_warning(UNIT(s), "Failed to queue service startup job: %s",
-                         bus_error_message(&error, r));
+                                 bus_error_message(&error, r));
+        else
+                log_unit_warning(UNIT(s), "Failed to queue service startup job (Maybe the service file is missing or not a %s unit?): %s",
+                                 cfd >= 0 ? "template" : "non-template",
+                                 bus_error_message(&error, r));
 
         socket_enter_stop_pre(s, SOCKET_FAILURE_RESOURCES);
-        safe_close(cfd);
 }
 
 static void socket_run_next(Socket *s) {

src/cryptsetup/cryptsetup-keyfile.c

@@ -2,7 +2,7 @@
 
 #include <unistd.h>
 
-#include "cryptsetup-util.h"
+#include "cryptsetup-keyfile.h"
 #include "fd-util.h"
 #include "format-util.h"
 #include "memory-util.h"

src/cryptsetup/cryptsetup-pkcs11.c

@@ -10,7 +10,7 @@
 #include "alloc-util.h"
 #include "ask-password-api.h"
 #include "cryptsetup-pkcs11.h"
-#include "cryptsetup-util.h"
+#include "cryptsetup-keyfile.h"
 #include "escape.h"
 #include "fd-util.h"
 #include "format-util.h"

src/cryptsetup/cryptsetup.c

@@ -11,7 +11,7 @@
 
 #include "alloc-util.h"
 #include "ask-password-api.h"
-#include "crypt-util.h"
+#include "cryptsetup-keyfile.h"
 #include "cryptsetup-pkcs11.h"
 #include "cryptsetup-util.h"
 #include "device-util.h"

src/home/homework-luks.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
-#include "crypt-util.h"
+#include "cryptsetup-util.h"
 #include "homework.h"
 #include "user-record.h"
 

src/partition/growfs.c

@@ -11,7 +11,7 @@
 #include <sys/vfs.h>
 
 #include "blockdev-util.h"
-#include "crypt-util.h"
+#include "cryptsetup-util.h"
 #include "device-nodes.h"
 #include "dissect-image.h"
 #include "escape.h"
@@ -30,11 +30,15 @@ static bool arg_dry_run = false;
 #if HAVE_LIBCRYPTSETUP
 static int resize_crypt_luks_device(dev_t devno, const char *fstype, dev_t main_devno) {
         _cleanup_free_ char *devpath = NULL, *main_devpath = NULL;
-        _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+        _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
         _cleanup_close_ int main_devfd = -1;
         uint64_t size;
         int r;
 
+        r = dlopen_cryptsetup();
+        if (r < 0)
+                return log_error_errno(r, "Cannot resize LUKS device: %m");
+
         r = device_path_make_major_minor(S_IFBLK, main_devno, &main_devpath);
         if (r < 0)
                 return log_error_errno(r, "Failed to format device major/minor path: %m");
@@ -52,20 +56,20 @@ static int resize_crypt_luks_device(dev_t devno, const char *fstype, dev_t main_
         if (r < 0)
                 return log_error_errno(r, "Failed to format major/minor path: %m");
 
-        r = crypt_init(&cd, devpath);
+        r = sym_crypt_init(&cd, devpath);
         if (r < 0)
                 return log_error_errno(r, "crypt_init(\"%s\") failed: %m", devpath);
 
         cryptsetup_enable_logging(cd);
 
-        r = crypt_load(cd, CRYPT_LUKS, NULL);
+        r = sym_crypt_load(cd, CRYPT_LUKS, NULL);
         if (r < 0)
                 return log_debug_errno(r, "Failed to load LUKS metadata for %s: %m", devpath);
 
         if (arg_dry_run)
                 return 0;
 
-        r = crypt_resize(cd, main_devpath, 0);
+        r = sym_crypt_resize(cd, main_devpath, 0);
         if (r < 0)
                 return log_error_errno(r, "crypt_resize() of %s failed: %m", devpath);
 

src/partition/repart.c

@@ -24,7 +24,7 @@
 #include "btrfs-util.h"
 #include "conf-files.h"
 #include "conf-parser.h"
-#include "crypt-util.h"
+#include "cryptsetup-util.h"
 #include "def.h"
 #include "efivars.h"
 #include "errno-util.h"
@@ -2370,7 +2370,7 @@ static int partition_encrypt(
                 char **ret_volume,
                 int *ret_fd) {
 
-        _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+        _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
         _cleanup_(erase_and_freep) void *volume_key = NULL;
         _cleanup_free_ char *dm_name = NULL, *vol = NULL;
         char suuid[ID128_UUID_STRING_MAX];
@@ -2381,6 +2381,10 @@ static int partition_encrypt(
         assert(p);
         assert(p->encrypt);
 
+        r = dlopen_cryptsetup();
+        if (r < 0)
+                return log_error_errno(r, "libcryptsetup not found, cannot encrypt: %m");
+
         if (asprintf(&dm_name, "luks-repart-%08" PRIx64, random_u64()) < 0)
                 return log_oom();
 
@@ -2404,13 +2408,13 @@ static int partition_encrypt(
         if (r < 0)
                 return log_error_errno(r, "Failed to generate volume key: %m");
 
-        r = crypt_init(&cd, node);
+        r = sym_crypt_init(&cd, node);
         if (r < 0)
                 return log_error_errno(r, "Failed to allocate libcryptsetup context: %m");
 
         cryptsetup_enable_logging(cd);
 
-        r = crypt_format(cd,
+        r = sym_crypt_format(cd,
                          CRYPT_LUKS2,
                          "aes",
                          "xts-plain64",
@@ -2424,7 +2428,7 @@ static int partition_encrypt(
         if (r < 0)
                 return log_error_errno(r, "Failed to LUKS2 format future partition: %m");
 
-        r = crypt_keyslot_add_by_volume_key(
+        r = sym_crypt_keyslot_add_by_volume_key(
                         cd,
                         CRYPT_ANY_SLOT,
                         volume_key,
@@ -2434,7 +2438,7 @@ static int partition_encrypt(
         if (r < 0)
                 return log_error_errno(r, "Failed to add LUKS2 key: %m");
 
-        r = crypt_activate_by_volume_key(
+        r = sym_crypt_activate_by_volume_key(
                         cd,
                         dm_name,
                         volume_key,
@@ -2474,7 +2478,7 @@ static int deactivate_luks(struct crypt_device *cd, const char *node) {
         /* udev or so might access out block device in the background while we are done. Let's hence force
          * detach the volume. We sync'ed before, hence this should be safe. */
 
-        r = crypt_deactivate_by_name(cd, basename(node), CRYPT_DEACTIVATE_FORCE);
+        r = sym_crypt_deactivate_by_name(cd, basename(node), CRYPT_DEACTIVATE_FORCE);
         if (r < 0)
                 return log_error_errno(r, "Failed to deactivate LUKS device: %m");
 
@@ -2490,7 +2494,7 @@ static int context_copy_blocks(Context *context) {
         /* Copy in file systems on the block level */
 
         LIST_FOREACH(partitions, p, context->partitions) {
-                _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+                _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
                 _cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
                 _cleanup_free_ char *encrypted = NULL;
                 _cleanup_close_ int encrypted_dev_fd = -1;
@@ -2553,7 +2557,7 @@ static int context_copy_blocks(Context *context) {
                         if (r < 0)
                                 return r;
 
-                        crypt_free(cd);
+                        sym_crypt_free(cd);
                         cd = NULL;
 
                         r = loop_device_sync(d);
@@ -2694,7 +2698,7 @@ static int context_mkfs(Context *context) {
         /* Make a file system */
 
         LIST_FOREACH(partitions, p, context->partitions) {
-                _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+                _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
                 _cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
                 _cleanup_free_ char *encrypted = NULL;
                 _cleanup_close_ int encrypted_dev_fd = -1;
@@ -2781,7 +2785,7 @@ static int context_mkfs(Context *context) {
                         if (r < 0)
                                 return r;
 
-                        crypt_free(cd);
+                        sym_crypt_free(cd);
                         cd = NULL;
                 }
 

src/shared/crypt-util.c

@@ -1,34 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
-
-#if HAVE_LIBCRYPTSETUP
-#include "crypt-util.h"
-#include "log.h"
-
-static void cryptsetup_log_glue(int level, const char *msg, void *usrptr) {
-        switch (level) {
-        case CRYPT_LOG_NORMAL:
-                level = LOG_NOTICE;
-                break;
-        case CRYPT_LOG_ERROR:
-                level = LOG_ERR;
-                break;
-        case CRYPT_LOG_VERBOSE:
-                level = LOG_INFO;
-                break;
-        case CRYPT_LOG_DEBUG:
-                level = LOG_DEBUG;
-                break;
-        default:
-                log_error("Unknown libcryptsetup log level: %d", level);
-                level = LOG_ERR;
-        }
-
-        log_full(level, "%s", msg);
-}
-
-void cryptsetup_enable_logging(struct crypt_device *cd) {
-        crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
-        crypt_set_debug_level(DEBUG_LOGGING ? CRYPT_DEBUG_ALL : CRYPT_DEBUG_NONE);
-}
-
-#endif

src/shared/crypt-util.h

@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
-#pragma once
-
-#if HAVE_LIBCRYPTSETUP
-#include <libcryptsetup.h>
-
-#include "macro.h"
-
-DEFINE_TRIVIAL_CLEANUP_FUNC(struct crypt_device *, crypt_free);
-
-void cryptsetup_enable_logging(struct crypt_device *cd);
-#endif

src/shared/cryptsetup-util.c

@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#if HAVE_LIBCRYPTSETUP
+#include "alloc-util.h"
+#include "cryptsetup-util.h"
+#include "dlfcn-util.h"
+#include "log.h"
+
+static void *cryptsetup_dl = NULL;
+
+int (*sym_crypt_activate_by_passphrase)(struct crypt_device *cd, const char *name, int keyslot, const char *passphrase, size_t passphrase_size, uint32_t flags);
+#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
+int (*sym_crypt_activate_by_signed_key)(struct crypt_device *cd, const char *name, const char *volume_key, size_t volume_key_size, const char *signature, size_t signature_size, uint32_t flags);
+#endif
+int (*sym_crypt_activate_by_volume_key)(struct crypt_device *cd, const char *name, const char *volume_key, size_t volume_key_size, uint32_t flags);
+int (*sym_crypt_deactivate_by_name)(struct crypt_device *cd, const char *name, uint32_t flags);
+int (*sym_crypt_format)(struct crypt_device *cd, const char *type, const char *cipher, const char *cipher_mode, const char *uuid, const char *volume_key, size_t volume_key_size, void *params);
+void (*sym_crypt_free)(struct crypt_device *cd);
+const char *(*sym_crypt_get_dir)(void);
+int (*sym_crypt_get_verity_info)(struct crypt_device *cd, struct crypt_params_verity *vp);
+int (*sym_crypt_init)(struct crypt_device **cd, const char *device);
+int (*sym_crypt_init_by_name)(struct crypt_device **cd, const char *name);
+int (*sym_crypt_keyslot_add_by_volume_key)(struct crypt_device *cd, int keyslot, const char *volume_key, size_t volume_key_size, const char *passphrase, size_t passphrase_size);
+int (*sym_crypt_load)(struct crypt_device *cd, const char *requested_type, void *params);
+int (*sym_crypt_resize)(struct crypt_device *cd, const char *name, uint64_t new_size);
+int (*sym_crypt_set_data_device)(struct crypt_device *cd, const char *device);
+void (*sym_crypt_set_debug_level)(int level);
+void (*sym_crypt_set_log_callback)(struct crypt_device *cd, void (*log)(int level, const char *msg, void *usrptr), void *usrptr);
+int (*sym_crypt_volume_key_get)(struct crypt_device *cd, int keyslot, char *volume_key, size_t *volume_key_size, const char *passphrase, size_t passphrase_size);
+
+int dlopen_cryptsetup(void) {
+        _cleanup_(dlclosep) void *dl = NULL;
+        int r;
+
+        if (cryptsetup_dl)
+                return 0; /* Already loaded */
+
+        dl = dlopen("libcryptsetup.so.12", RTLD_LAZY);
+        if (!dl)
+                return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+                                       "libcryptsetup support is not installed: %s", dlerror());
+
+        r = dlsym_many_and_warn(
+                        dl,
+                        LOG_DEBUG,
+                        &sym_crypt_activate_by_passphrase, "crypt_activate_by_passphrase",
+#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
+                        &sym_crypt_activate_by_signed_key, "crypt_activate_by_signed_key",
+#endif
+                        &sym_crypt_activate_by_volume_key, "crypt_activate_by_volume_key",
+                        &sym_crypt_deactivate_by_name, "crypt_deactivate_by_name",
+                        &sym_crypt_format, "crypt_format",
+                        &sym_crypt_free, "crypt_free",
+                        &sym_crypt_get_dir, "crypt_get_dir",
+                        &sym_crypt_get_verity_info, "crypt_get_verity_info",
+                        &sym_crypt_init, "crypt_init",
+                        &sym_crypt_init_by_name, "crypt_init_by_name",
+                        &sym_crypt_keyslot_add_by_volume_key, "crypt_keyslot_add_by_volume_key",
+                        &sym_crypt_load, "crypt_load",
+                        &sym_crypt_resize, "crypt_resize",
+                        &sym_crypt_set_data_device, "crypt_set_data_device",
+                        &sym_crypt_set_debug_level, "crypt_set_debug_level",
+                        &sym_crypt_set_log_callback, "crypt_set_log_callback",
+                        &sym_crypt_volume_key_get, "crypt_volume_key_get",
+                        NULL);
+        if (r < 0)
+                return r;
+
+        /* Note that we never release the reference here, because there's no real reason to, after all this
+         * was traditionally a regular shared library dependency which lives forever too. */
+        cryptsetup_dl = TAKE_PTR(dl);
+        return 1;
+}
+
+static void cryptsetup_log_glue(int level, const char *msg, void *usrptr) {
+
+        switch (level) {
+        case CRYPT_LOG_NORMAL:
+                level = LOG_NOTICE;
+                break;
+        case CRYPT_LOG_ERROR:
+                level = LOG_ERR;
+                break;
+        case CRYPT_LOG_VERBOSE:
+                level = LOG_INFO;
+                break;
+        case CRYPT_LOG_DEBUG:
+                level = LOG_DEBUG;
+                break;
+        default:
+                log_error("Unknown libcryptsetup log level: %d", level);
+                level = LOG_ERR;
+        }
+
+        log_full(level, "%s", msg);
+}
+
+void cryptsetup_enable_logging(struct crypt_device *cd) {
+        if (!cd)
+                return;
+
+        if (dlopen_cryptsetup() < 0) /* If this fails, let's gracefully ignore the issue, this is just debug
+                                      * logging after all, and if this failed we already generated a debug
+                                      * log message that should help to track things down. */
+                return;
+
+        sym_crypt_set_log_callback(cd, cryptsetup_log_glue, NULL);
+        sym_crypt_set_debug_level(DEBUG_LOGGING ? CRYPT_DEBUG_ALL : CRYPT_DEBUG_NONE);
+}
+
+#endif

src/shared/cryptsetup-util.h

@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include "macro.h"
+
+#if HAVE_LIBCRYPTSETUP
+#include <libcryptsetup.h>
+
+extern int (*sym_crypt_activate_by_passphrase)(struct crypt_device *cd, const char *name, int keyslot, const char *passphrase, size_t passphrase_size, uint32_t flags);
+#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
+extern int (*sym_crypt_activate_by_signed_key)(struct crypt_device *cd, const char *name, const char *volume_key, size_t volume_key_size, const char *signature, size_t signature_size, uint32_t flags);
+#endif
+extern int (*sym_crypt_activate_by_volume_key)(struct crypt_device *cd, const char *name, const char *volume_key, size_t volume_key_size, uint32_t flags);
+extern int (*sym_crypt_deactivate_by_name)(struct crypt_device *cd, const char *name, uint32_t flags);
+extern int (*sym_crypt_format)(struct crypt_device *cd, const char *type, const char *cipher, const char *cipher_mode, const char *uuid, const char *volume_key, size_t volume_key_size, void *params);
+extern void (*sym_crypt_free)(struct crypt_device *cd);
+extern const char *(*sym_crypt_get_dir)(void);
+extern int (*sym_crypt_get_verity_info)(struct crypt_device *cd, struct crypt_params_verity *vp);
+extern int (*sym_crypt_init)(struct crypt_device **cd, const char *device);
+extern int (*sym_crypt_init_by_name)(struct crypt_device **cd, const char *name);
+extern int (*sym_crypt_keyslot_add_by_volume_key)(struct crypt_device *cd, int keyslot, const char *volume_key, size_t volume_key_size, const char *passphrase, size_t passphrase_size);
+extern int (*sym_crypt_load)(struct crypt_device *cd, const char *requested_type, void *params);
+extern int (*sym_crypt_resize)(struct crypt_device *cd, const char *name, uint64_t new_size);
+extern int (*sym_crypt_set_data_device)(struct crypt_device *cd, const char *device);
+extern void (*sym_crypt_set_debug_level)(int level);
+extern void (*sym_crypt_set_log_callback)(struct crypt_device *cd, void (*log)(int level, const char *msg, void *usrptr), void *usrptr);
+extern int (*sym_crypt_volume_key_get)(struct crypt_device *cd, int keyslot, char *volume_key, size_t *volume_key_size, const char *passphrase, size_t passphrase_size);
+
+int dlopen_cryptsetup(void);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(struct crypt_device *, crypt_free);
+DEFINE_TRIVIAL_CLEANUP_FUNC(struct crypt_device *, sym_crypt_free);
+
+void cryptsetup_enable_logging(struct crypt_device *cd);
+
+#endif

src/shared/dissect-image.c

@@ -19,7 +19,7 @@
 #include "blkid-util.h"
 #include "blockdev-util.h"
 #include "copy.h"
-#include "crypt-util.h"
+#include "cryptsetup-util.h"
 #include "def.h"
 #include "device-nodes.h"
 #include "device-util.h"
@@ -1225,13 +1225,13 @@ DecryptedImage* decrypted_image_unref(DecryptedImage* d) {
                 DecryptedPartition *p = d->decrypted + i;
 
                 if (p->device && p->name && !p->relinquished) {
-                        r = crypt_deactivate(p->device, p->name);
+                        r = sym_crypt_deactivate_by_name(p->device, p->name, 0);
                         if (r < 0)
                                 log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name);
                 }
 
                 if (p->device)
-                        crypt_free(p->device);
+                        sym_crypt_free(p->device);
                 free(p->name);
         }
 
@@ -1265,7 +1265,7 @@ static int make_dm_name_and_node(const void *original_node, const char *suffix,
         if (!filename_is_valid(name))
                 return -EINVAL;
 
-        node = path_join(crypt_get_dir(), name);
+        node = path_join(sym_crypt_get_dir(), name);
         if (!node)
                 return -ENOMEM;
 
@@ -1282,7 +1282,7 @@ static int decrypt_partition(
                 DecryptedImage *d) {
 
         _cleanup_free_ char *node = NULL, *name = NULL;
-        _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+        _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
         int r;
 
         assert(m);
@@ -1297,6 +1297,10 @@ static int decrypt_partition(
         if (!passphrase)
                 return -ENOKEY;
 
+        r = dlopen_cryptsetup();
+        if (r < 0)
+                return r;
+
         r = make_dm_name_and_node(m->node, "-decrypted", &name, &node);
         if (r < 0)
                 return r;
@@ -1304,19 +1308,19 @@ static int decrypt_partition(
         if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1))
                 return -ENOMEM;
 
-        r = crypt_init(&cd, m->node);
+        r = sym_crypt_init(&cd, m->node);
         if (r < 0)
                 return log_debug_errno(r, "Failed to initialize dm-crypt: %m");
 
         cryptsetup_enable_logging(cd);
 
-        r = crypt_load(cd, CRYPT_LUKS, NULL);
+        r = sym_crypt_load(cd, CRYPT_LUKS, NULL);
         if (r < 0)
                 return log_debug_errno(r, "Failed to load LUKS metadata: %m");
 
-        r = crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
+        r = sym_crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase),
-                                         ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
+                                             ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) |
-                                         ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
+                                             ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0));
         if (r < 0) {
                 log_debug_errno(r, "Failed to activate LUKS device: %m");
                 return r == -EPERM ? -EKEYREJECTED : r;
@@ -1334,23 +1338,26 @@ static int decrypt_partition(
 static int verity_can_reuse(const void *root_hash, size_t root_hash_size, bool has_sig, const char *name, struct crypt_device **ret_cd) {
         /* If the same volume was already open, check that the root hashes match, and reuse it if they do */
         _cleanup_free_ char *root_hash_existing = NULL;
-        _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+        _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
         struct crypt_params_verity crypt_params = {};
         size_t root_hash_existing_size = root_hash_size;
         int r;
 
         assert(ret_cd);
 
-        r = crypt_init_by_name(&cd, name);
+        r = sym_crypt_init_by_name(&cd, name);
         if (r < 0)
                 return log_debug_errno(r, "Error opening verity device, crypt_init_by_name failed: %m");
-        r = crypt_get_verity_info(cd, &crypt_params);
+
+        r = sym_crypt_get_verity_info(cd, &crypt_params);
         if (r < 0)
                 return log_debug_errno(r, "Error opening verity device, crypt_get_verity_info failed: %m");
+
         root_hash_existing = malloc0(root_hash_size);
         if (!root_hash_existing)
                 return -ENOMEM;
-        r = crypt_volume_key_get(cd, CRYPT_ANY_SLOT, root_hash_existing, &root_hash_existing_size, NULL, 0);
+
+        r = sym_crypt_volume_key_get(cd, CRYPT_ANY_SLOT, root_hash_existing, &root_hash_existing_size, NULL, 0);
         if (r < 0)
                 return log_debug_errno(r, "Error opening verity device, crypt_volume_key_get failed: %m");
         if (root_hash_size != root_hash_existing_size || memcmp(root_hash_existing, root_hash, root_hash_size) != 0)
@@ -1370,7 +1377,8 @@ static int verity_can_reuse(const void *root_hash, size_t root_hash_size, bool h
 static inline void dm_deferred_remove_clean(char *name) {
         if (!name)
                 return;
-        (void) crypt_deactivate_by_name(NULL, name, CRYPT_DEACTIVATE_DEFERRED);
+
+        (void) sym_crypt_deactivate_by_name(NULL, name, CRYPT_DEACTIVATE_DEFERRED);
         free(name);
 }
 DEFINE_TRIVIAL_CLEANUP_FUNC(char *, dm_deferred_remove_clean);
@@ -1388,7 +1396,7 @@ static int verity_partition(
                 DecryptedImage *d) {
 
         _cleanup_free_ char *node = NULL, *name = NULL, *hash_sig_from_file = NULL;
-        _cleanup_(crypt_freep) struct crypt_device *cd = NULL;
+        _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
         _cleanup_(dm_deferred_remove_cleanp) char *restore_deferred_remove = NULL;
         int r;
 
@@ -1408,11 +1416,17 @@ static int verity_partition(
                         return 0;
         }
 
+        r = dlopen_cryptsetup();
+        if (r < 0)
+                return r;
+
         if (FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE)) {
                 /* Use the roothash, which is unique per volume, as the device node name, so that it can be reused */
                 _cleanup_free_ char *root_hash_encoded = NULL;
+
                 root_hash_encoded = hexmem(root_hash, root_hash_size);
                 if (!root_hash_encoded)
+
                         return -ENOMEM;
                 r = make_dm_name_and_node(root_hash_encoded, "-verity", &name, &node);
         } else
@@ -1426,17 +1440,17 @@ static int verity_partition(
                         return r;
         }
 
-        r = crypt_init(&cd, verity_data ?: v->node);
+        r = sym_crypt_init(&cd, verity_data ?: v->node);
         if (r < 0)
                 return r;
 
         cryptsetup_enable_logging(cd);
 
-        r = crypt_load(cd, CRYPT_VERITY, NULL);
+        r = sym_crypt_load(cd, CRYPT_VERITY, NULL);
         if (r < 0)
                 return r;
 
-        r = crypt_set_data_device(cd, m->node);
+        r = sym_crypt_set_data_device(cd, m->node);
         if (r < 0)
                 return r;
 
@@ -1449,12 +1463,12 @@ static int verity_partition(
         for (unsigned i = 0; i < N_DEVICE_NODE_LIST_ATTEMPTS; i++) {
                 if (root_hash_sig || hash_sig_from_file) {
 #if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY
-                        r = crypt_activate_by_signed_key(cd, name, root_hash, root_hash_size, root_hash_sig ?: hash_sig_from_file, root_hash_sig_size, CRYPT_ACTIVATE_READONLY);
+                        r = sym_crypt_activate_by_signed_key(cd, name, root_hash, root_hash_size, root_hash_sig ?: hash_sig_from_file, root_hash_sig_size, CRYPT_ACTIVATE_READONLY);
 #else
                         r = log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "activation of verity device with signature requested, but not supported by cryptsetup due to missing crypt_activate_by_signed_key()");
 #endif
                 } else
-                        r = crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
+                        r = sym_crypt_activate_by_volume_key(cd, name, root_hash, root_hash_size, CRYPT_ACTIVATE_READONLY);
                 /* libdevmapper can return EINVAL when the device is already in the activation stage.
                  * There's no way to distinguish this situation from a genuine error due to invalid
                  * parameters, so immediately fall back to activating the device with a unique name.
@@ -1500,7 +1514,7 @@ static int verity_partition(
                                         return r;
 
                                 if (cd)
-                                        crypt_free(cd);
+                                        sym_crypt_free(cd);
                                 cd = existing_cd;
                         }
                 }
@@ -1664,7 +1678,7 @@ int decrypted_image_relinquish(DecryptedImage *d) {
                 if (p->relinquished)
                         continue;
 
-                r = crypt_deactivate_by_name(NULL, p->name, CRYPT_DEACTIVATE_DEFERRED);
+                r = sym_crypt_deactivate_by_name(NULL, p->name, CRYPT_DEACTIVATE_DEFERRED);
                 if (r < 0)
                         return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name);
 

src/shared/meson.build

@@ -73,8 +73,8 @@ shared_sources = files('''
         coredump-util.h
         cpu-set-util.c
         cpu-set-util.h
-        crypt-util.c
+        cryptsetup-util.c
-        crypt-util.h
+        cryptsetup-util.h
         daemon-util.h
         dev-setup.c
         dev-setup.h
@@ -354,7 +354,6 @@ libshared_deps = [threads,
                   libblkid,
                   libcap,
                   libcrypt,
-                  libcryptsetup,
                   libgcrypt,
                   libidn,
                   libiptc,

src/udev/udevd.c

@@ -656,6 +656,10 @@ static void event_run(Manager *manager, struct event *event) {
         /* Re-enable the debug message for the next batch of events */
         log_children_max_reached = true;
 
+        /* fork with up-to-date SELinux label database, so the child inherits the up-to-date db
+           and, until the next SELinux policy changes, we safe further reloads in future children */
+        mac_selinux_maybe_reload();
+
         /* start new worker and pass initial device */
         worker_spawn(manager, event);
 }

src/veritysetup/veritysetup.c

@@ -5,7 +5,7 @@
 #include <sys/stat.h>
 
 #include "alloc-util.h"
-#include "crypt-util.h"
+#include "cryptsetup-util.h"
 #include "fileio.h"
 #include "hexdecoct.h"
 #include "log.h"