diff options
author | Luca Boccassi <luca.boccassi@microsoft.com> | 2021-01-22 17:49:11 +0000 |
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committer | GitHub <noreply@github.com> | 2021-01-22 17:49:11 +0000 |
commit | 95457dc13cc5fba332c44cbe3aa35e2fa129588f (patch) | |
tree | 1833a55106b31291787a9a317cadaa5e5daef982 /src | |
parent | 42e6f5497963162643f9da06384b0c9f0755d229 (diff) | |
parent | 6faecbd353f9eb5aebe65a7159c5e61191e4330f (diff) | |
download | systemd-95457dc13cc5fba332c44cbe3aa35e2fa129588f.tar.gz |
Merge pull request #18302 from bluca/mount_image_runtime
systemctl/core: add DBUS method to mount images without service restart
Diffstat (limited to 'src')
-rw-r--r-- | src/core/dbus-execute.c | 72 | ||||
-rw-r--r-- | src/core/dbus-manager.c | 16 | ||||
-rw-r--r-- | src/core/dbus-service.c | 50 | ||||
-rw-r--r-- | src/core/dbus-service.h | 1 | ||||
-rw-r--r-- | src/core/dbus-util.c | 76 | ||||
-rw-r--r-- | src/core/dbus-util.h | 3 | ||||
-rw-r--r-- | src/core/namespace.c | 66 | ||||
-rw-r--r-- | src/core/org.freedesktop.systemd1.conf | 8 | ||||
-rw-r--r-- | src/shared/dissect-image.c | 73 | ||||
-rw-r--r-- | src/shared/dissect-image.h | 2 | ||||
-rw-r--r-- | src/shared/mount-util.c | 60 | ||||
-rw-r--r-- | src/shared/mount-util.h | 2 | ||||
-rw-r--r-- | src/systemctl/systemctl-mount.c | 75 | ||||
-rw-r--r-- | src/systemctl/systemctl-mount.h | 1 | ||||
-rw-r--r-- | src/systemctl/systemctl.c | 5 |
15 files changed, 356 insertions, 154 deletions
diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c index 20403df819..8434ccb48e 100644 --- a/src/core/dbus-execute.c +++ b/src/core/dbus-execute.c @@ -1497,74 +1497,6 @@ static BUS_DEFINE_SET_TRANSIENT_TO_STRING_ALLOC(capability, "t", uint64_t, uint6 static BUS_DEFINE_SET_TRANSIENT_TO_STRING_ALLOC(namespace_flag, "t", uint64_t, unsigned long, "%" PRIu64, namespace_flags_to_string); static BUS_DEFINE_SET_TRANSIENT_TO_STRING(mount_flags, "t", uint64_t, unsigned long, "%" PRIu64, mount_propagation_flags_to_string_with_check); -/* ret_format_str is an accumulator, so if it has any pre-existing content, new options will be appended to it */ -static int read_mount_options(sd_bus_message *message, sd_bus_error *error, MountOptions **ret_options, char **ret_format_str, const char *separator) { - _cleanup_(mount_options_free_allp) MountOptions *options = NULL; - _cleanup_free_ char *format_str = NULL; - const char *mount_options, *partition; - int r; - - assert(message); - assert(ret_options); - assert(ret_format_str); - assert(separator); - - r = sd_bus_message_enter_container(message, 'a', "(ss)"); - if (r < 0) - return r; - - while ((r = sd_bus_message_read(message, "(ss)", &partition, &mount_options)) > 0) { - _cleanup_free_ char *previous = NULL, *escaped = NULL; - _cleanup_free_ MountOptions *o = NULL; - PartitionDesignator partition_designator; - - if (chars_intersect(mount_options, WHITESPACE)) - return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, - "Invalid mount options string, contains whitespace character(s): %s", mount_options); - - partition_designator = partition_designator_from_string(partition); - if (partition_designator < 0) - return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid partition name %s", partition); - - /* Need to store them in the unit with the escapes, so that they can be parsed again */ - escaped = shell_escape(mount_options, ":"); - if (!escaped) - return -ENOMEM; - - previous = TAKE_PTR(format_str); - format_str = strjoin(previous, previous ? separator : "", partition, ":", escaped); - if (!format_str) - return -ENOMEM; - - o = new(MountOptions, 1); - if (!o) - return -ENOMEM; - *o = (MountOptions) { - .partition_designator = partition_designator, - .options = strdup(mount_options), - }; - if (!o->options) - return -ENOMEM; - LIST_APPEND(mount_options, options, TAKE_PTR(o)); - } - if (r < 0) - return r; - - r = sd_bus_message_exit_container(message); - if (r < 0) - return r; - - if (!LIST_IS_EMPTY(options)) { - char *final = strjoin(*ret_format_str, !isempty(*ret_format_str) ? separator : "", format_str); - if (!final) - return -ENOMEM; - free_and_replace(*ret_format_str, final); - LIST_JOIN(mount_options, *ret_options, options); - } - - return 0; -} - int bus_exec_context_set_transient_property( Unit *u, ExecContext *c, @@ -1599,7 +1531,7 @@ int bus_exec_context_set_transient_property( _cleanup_(mount_options_free_allp) MountOptions *options = NULL; _cleanup_free_ char *format_str = NULL; - r = read_mount_options(message, error, &options, &format_str, " "); + r = bus_read_mount_options(message, error, &options, &format_str, " "); if (r < 0) return r; @@ -3407,7 +3339,7 @@ int bus_exec_context_set_transient_property( return -ENOMEM; free_and_replace(format_str, tuple); - r = read_mount_options(message, error, &options, &format_str, ":"); + r = bus_read_mount_options(message, error, &options, &format_str, ":"); if (r < 0) return r; diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c index 4b88f0d9f0..eeb74353da 100644 --- a/src/core/dbus-manager.c +++ b/src/core/dbus-manager.c @@ -731,6 +731,11 @@ static int method_bind_mount_unit(sd_bus_message *message, void *userdata, sd_bu return method_generic_unit_operation(message, userdata, error, bus_service_method_bind_mount, GENERIC_UNIT_VALIDATE_LOADED); } +static int method_mount_image_unit(sd_bus_message *message, void *userdata, sd_bus_error *error) { + /* Only add mounts on fully loaded units */ + return method_generic_unit_operation(message, userdata, error, bus_service_method_mount_image, GENERIC_UNIT_VALIDATE_LOADED); +} + static int method_ref_unit(sd_bus_message *message, void *userdata, sd_bus_error *error) { /* Only allow reffing of fully loaded units, and make sure reffing a unit loads it. */ return method_generic_unit_operation(message, userdata, error, bus_unit_method_ref, GENERIC_UNIT_LOAD|GENERIC_UNIT_VALIDATE_LOADED); @@ -2776,6 +2781,17 @@ const sd_bus_vtable bus_manager_vtable[] = { NULL,, method_bind_mount_unit, SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("MountImageUnit", + "sssbba(ss)", + SD_BUS_PARAM(name) + SD_BUS_PARAM(source) + SD_BUS_PARAM(destination) + SD_BUS_PARAM(read_only) + SD_BUS_PARAM(mkdir) + SD_BUS_PARAM(options), + NULL,, + method_mount_image_unit, + SD_BUS_VTABLE_UNPRIVILEGED), SD_BUS_METHOD_WITH_NAMES("RefUnit", "s", SD_BUS_PARAM(name), diff --git a/src/core/dbus-service.c b/src/core/dbus-service.c index 6df93e44a4..f7cdb51eba 100644 --- a/src/core/dbus-service.c +++ b/src/core/dbus-service.c @@ -95,9 +95,10 @@ static int property_get_exit_status_set( return sd_bus_message_close_container(reply); } -int bus_service_method_bind_mount(sd_bus_message *message, void *userdata, sd_bus_error *error) { - int read_only, make_file_or_directory; +static int bus_service_method_mount(sd_bus_message *message, void *userdata, sd_bus_error *error, bool is_image) { + _cleanup_(mount_options_free_allp) MountOptions *options = NULL; const char *dest, *src, *propagate_directory; + int read_only, make_file_or_directory; Unit *u = userdata; ExecContext *c; pid_t unit_pid; @@ -120,16 +121,22 @@ int bus_service_method_bind_mount(sd_bus_message *message, void *userdata, sd_bu if (!path_is_absolute(src) || !path_is_normalized(src)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Source path must be absolute and normalized."); - if (isempty(dest)) + if (!is_image && isempty(dest)) dest = src; else if (!path_is_absolute(dest) || !path_is_normalized(dest)) return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Destination path must be absolute and normalized."); + if (is_image) { + r = bus_read_mount_options(message, error, &options, NULL, ""); + if (r < 0) + return r; + } + r = bus_verify_manage_units_async_full( u, - "bind-mount", + is_image ? "mount-image" : "bind-mount", CAP_SYS_ADMIN, - N_("Authentication is required to bind mount on '$(unit)'."), + N_("Authentication is required to mount on '$(unit)'."), true, message, error); @@ -158,16 +165,30 @@ int bus_service_method_bind_mount(sd_bus_message *message, void *userdata, sd_bu return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unit is not running"); propagate_directory = strjoina("/run/systemd/propagate/", u->id); - r = bind_mount_in_namespace(unit_pid, - propagate_directory, - "/run/systemd/incoming/", - src, dest, read_only, make_file_or_directory); + if (is_image) + r = mount_image_in_namespace(unit_pid, + propagate_directory, + "/run/systemd/incoming/", + src, dest, read_only, make_file_or_directory, options); + else + r = bind_mount_in_namespace(unit_pid, + propagate_directory, + "/run/systemd/incoming/", + src, dest, read_only, make_file_or_directory); if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to mount %s on %s in unit's namespace: %m", src, dest); return sd_bus_reply_method_return(message, NULL); } +int bus_service_method_bind_mount(sd_bus_message *message, void *userdata, sd_bus_error *error) { + return bus_service_method_mount(message, userdata, error, false); +} + +int bus_service_method_mount_image(sd_bus_message *message, void *userdata, sd_bus_error *error) { + return bus_service_method_mount(message, userdata, error, true); +} + const sd_bus_vtable bus_service_vtable[] = { SD_BUS_VTABLE_START(0), SD_BUS_PROPERTY("Type", "s", property_get_type, offsetof(Service, type), SD_BUS_VTABLE_PROPERTY_CONST), @@ -233,6 +254,17 @@ const sd_bus_vtable bus_service_vtable[] = { bus_service_method_bind_mount, SD_BUS_VTABLE_UNPRIVILEGED), + SD_BUS_METHOD_WITH_NAMES("MountImage", + "ssbba(ss)", + SD_BUS_PARAM(source) + SD_BUS_PARAM(destination) + SD_BUS_PARAM(read_only) + SD_BUS_PARAM(mkdir) + SD_BUS_PARAM(options), + NULL,, + bus_service_method_mount_image, + SD_BUS_VTABLE_UNPRIVILEGED), + /* The following four are obsolete, and thus marked hidden here. They moved into the Unit interface */ SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Unit, start_ratelimit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN), SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Unit, start_ratelimit.burst), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN), diff --git a/src/core/dbus-service.h b/src/core/dbus-service.h index 5b7b7b757b..9a05465802 100644 --- a/src/core/dbus-service.h +++ b/src/core/dbus-service.h @@ -10,4 +10,5 @@ extern const sd_bus_vtable bus_service_vtable[]; int bus_service_set_property(Unit *u, const char *name, sd_bus_message *i, UnitWriteFlags flags, sd_bus_error *error); int bus_service_method_bind_mount(sd_bus_message *message, void *userdata, sd_bus_error *error); +int bus_service_method_mount_image(sd_bus_message *message, void *userdata, sd_bus_error *error); int bus_service_commit_properties(Unit *u); diff --git a/src/core/dbus-util.c b/src/core/dbus-util.c index 2d22bc699a..6a6dd1ff41 100644 --- a/src/core/dbus-util.c +++ b/src/core/dbus-util.c @@ -3,6 +3,7 @@ #include "bus-polkit.h" #include "bus-util.h" #include "dbus-util.h" +#include "escape.h" #include "parse-util.h" #include "path-util.h" #include "unit-printf.h" @@ -186,3 +187,78 @@ int bus_verify_manage_units_async_full( &u->manager->polkit_registry, error); } + +/* ret_format_str is an accumulator, so if it has any pre-existing content, new options will be appended to it */ +int bus_read_mount_options( + sd_bus_message *message, + sd_bus_error *error, + MountOptions **ret_options, + char **ret_format_str, + const char *separator) { + + _cleanup_(mount_options_free_allp) MountOptions *options = NULL; + _cleanup_free_ char *format_str = NULL; + const char *mount_options, *partition; + int r; + + assert(message); + assert(ret_options); + assert(separator); + + r = sd_bus_message_enter_container(message, 'a', "(ss)"); + if (r < 0) + return r; + + while ((r = sd_bus_message_read(message, "(ss)", &partition, &mount_options)) > 0) { + _cleanup_free_ char *previous = NULL, *escaped = NULL; + _cleanup_free_ MountOptions *o = NULL; + PartitionDesignator partition_designator; + + if (chars_intersect(mount_options, WHITESPACE)) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, + "Invalid mount options string, contains whitespace character(s): %s", mount_options); + + partition_designator = partition_designator_from_string(partition); + if (partition_designator < 0) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid partition name %s", partition); + + /* Need to store the options with the escapes, so that they can be parsed again */ + escaped = shell_escape(mount_options, ":"); + if (!escaped) + return -ENOMEM; + + previous = TAKE_PTR(format_str); + format_str = strjoin(previous, previous ? separator : "", partition, ":", escaped); + if (!format_str) + return -ENOMEM; + + o = new(MountOptions, 1); + if (!o) + return -ENOMEM; + *o = (MountOptions) { + .partition_designator = partition_designator, + .options = strdup(mount_options), + }; + if (!o->options) + return -ENOMEM; + LIST_APPEND(mount_options, options, TAKE_PTR(o)); + } + if (r < 0) + return r; + + r = sd_bus_message_exit_container(message); + if (r < 0) + return r; + + if (!LIST_IS_EMPTY(options)) { + if (ret_format_str) { + char *final = strjoin(*ret_format_str, !isempty(*ret_format_str) ? separator : "", format_str); + if (!final) + return -ENOMEM; + free_and_replace(*ret_format_str, final); + } + LIST_JOIN(mount_options, *ret_options, options); + } + + return 0; +} diff --git a/src/core/dbus-util.h b/src/core/dbus-util.h index e35c632d37..bd4fd081c5 100644 --- a/src/core/dbus-util.h +++ b/src/core/dbus-util.h @@ -3,6 +3,7 @@ #include "sd-bus.h" +#include "dissect-image.h" #include "unit.h" int bus_property_get_triggered_unit(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error); @@ -249,3 +250,5 @@ static inline int bus_set_transient_usec_fix_0(Unit *u, const char *name, usec_t return bus_set_transient_usec_internal(u, name, p, true, message, flags, error); } int bus_verify_manage_units_async_full(Unit *u, const char *verb, int capability, const char *polkit_message, bool interactive, sd_bus_message *call, sd_bus_error *error); + +int bus_read_mount_options(sd_bus_message *message, sd_bus_error *error, MountOptions **ret_options, char **ret_format_str, const char *separator); diff --git a/src/core/namespace.c b/src/core/namespace.c index 12d9e4c867..db9a12319d 100644 --- a/src/core/namespace.c +++ b/src/core/namespace.c @@ -962,75 +962,13 @@ static int mount_run(const MountEntry *m) { } static int mount_images(const MountEntry *m) { - _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL; - _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL; - _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL; - _cleanup_(verity_settings_done) VeritySettings verity = VERITY_SETTINGS_DEFAULT; - DissectImageFlags dissect_image_flags; int r; assert(m); - r = verity_settings_load(&verity, mount_entry_source(m), NULL, NULL); - if (r < 0) - return log_debug_errno(r, "Failed to load root hash: %m"); - - dissect_image_flags = - (m->read_only ? DISSECT_IMAGE_READ_ONLY : 0) | - (verity.data_path ? DISSECT_IMAGE_NO_PARTITION_TABLE : 0); - - r = loop_device_make_by_path( - mount_entry_source(m), - m->read_only ? O_RDONLY : -1 /* < 0 means writable if possible, read-only as fallback */, - verity.data_path ? 0 : LO_FLAGS_PARTSCAN, - &loop_device); - if (r < 0) - return log_debug_errno(r, "Failed to create loop device for image: %m"); - - r = dissect_image( - loop_device->fd, - &verity, - m->image_options, - dissect_image_flags, - &dissected_image); - /* No partition table? Might be a single-filesystem image, try again */ - if (!verity.data_path && r == -ENOPKG) - r = dissect_image( - loop_device->fd, - &verity, - m->image_options, - dissect_image_flags|DISSECT_IMAGE_NO_PARTITION_TABLE, - &dissected_image); - if (r < 0) - return log_debug_errno(r, "Failed to dissect image: %m"); - - r = dissected_image_decrypt( - dissected_image, - NULL, - &verity, - dissect_image_flags, - &decrypted_image); - if (r < 0) - return log_debug_errno(r, "Failed to decrypt dissected image: %m"); - - r = mkdir_p_label(mount_entry_path(m), 0755); - if (r < 0) - return log_debug_errno(r, "Failed to create destination directory %s: %m", mount_entry_path(m)); - r = umount_recursive(mount_entry_path(m), 0); - if (r < 0) - return log_debug_errno(r, "Failed to umount under destination directory %s: %m", mount_entry_path(m)); - - r = dissected_image_mount(dissected_image, mount_entry_path(m), UID_INVALID, dissect_image_flags); + r = verity_dissect_and_mount(mount_entry_source(m), mount_entry_path(m), m->image_options); if (r < 0) - return log_debug_errno(r, "Failed to mount image: %m"); - - if (decrypted_image) { - r = decrypted_image_relinquish(decrypted_image); - if (r < 0) - return log_debug_errno(r, "Failed to relinquish decrypted image: %m"); - } - - loop_device_relinquish(loop_device); + return log_debug_errno(r, "Failed to mount image %s on %s: %m", mount_entry_source(m), mount_entry_path(m)); return 1; } diff --git a/src/core/org.freedesktop.systemd1.conf b/src/core/org.freedesktop.systemd1.conf index 0cea4d2b02..f405b27658 100644 --- a/src/core/org.freedesktop.systemd1.conf +++ b/src/core/org.freedesktop.systemd1.conf @@ -228,6 +228,10 @@ <allow send_destination="org.freedesktop.systemd1" send_interface="org.freedesktop.systemd1.Manager" + send_member="MountImageUnit"/> + + <allow send_destination="org.freedesktop.systemd1" + send_interface="org.freedesktop.systemd1.Manager" send_member="KillUnit"/> <allow send_destination="org.freedesktop.systemd1" @@ -400,6 +404,10 @@ send_interface="org.freedesktop.systemd1.Service" send_member="BindMount"/> + <allow send_destination="org.freedesktop.systemd1" + send_interface="org.freedesktop.systemd1.Service" + send_member="MountImage"/> + <!-- Managed via polkit or other criteria: org.freedesktop.systemd1.Scope interface --> <allow send_destination="org.freedesktop.systemd1" diff --git a/src/shared/dissect-image.c b/src/shared/dissect-image.c index f2634139f7..1643ae73be 100644 --- a/src/shared/dissect-image.c +++ b/src/shared/dissect-image.c @@ -2554,4 +2554,77 @@ static const char *const partition_designator_table[] = { [PARTITION_VAR] = "var", }; +int verity_dissect_and_mount(const char *src, const char *dest, const MountOptions *options) { + _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL; + _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL; + _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL; + _cleanup_(verity_settings_done) VeritySettings verity = VERITY_SETTINGS_DEFAULT; + DissectImageFlags dissect_image_flags; + int r; + + assert(src); + assert(dest); + + r = verity_settings_load(&verity, src, NULL, NULL); + if (r < 0) + return log_debug_errno(r, "Failed to load root hash: %m"); + + dissect_image_flags = verity.data_path ? DISSECT_IMAGE_NO_PARTITION_TABLE : 0; + + r = loop_device_make_by_path( + src, + -1, + verity.data_path ? 0 : LO_FLAGS_PARTSCAN, + &loop_device); + if (r < 0) + return log_debug_errno(r, "Failed to create loop device for image: %m"); + + r = dissect_image( + loop_device->fd, + &verity, + options, + dissect_image_flags, + &dissected_image); + /* No partition table? Might be a single-filesystem image, try again */ + if (!verity.data_path && r == -ENOPKG) + r = dissect_image( + loop_device->fd, + &verity, + options, + dissect_image_flags|DISSECT_IMAGE_NO_PARTITION_TABLE, + &dissected_image); + if (r < 0) + return log_debug_errno(r, "Failed to dissect image: %m"); + + r = dissected_image_decrypt( + dissected_image, + NULL, + &verity, + dissect_image_flags, + &decrypted_image); + if (r < 0) + return log_debug_errno(r, "Failed to decrypt dissected image: %m"); + + r = mkdir_p_label(dest, 0755); + if (r < 0) + return log_debug_errno(r, "Failed to create destination directory %s: %m", dest); + r = umount_recursive(dest, 0); + if (r < 0) + return log_debug_errno(r, "Failed to umount under destination directory %s: %m", dest); + + r = dissected_image_mount(dissected_image, dest, UID_INVALID, dissect_image_flags); + if (r < 0) + return log_debug_errno(r, "Failed to mount image: %m"); + + if (decrypted_image) { + r = decrypted_image_relinquish(decrypted_image); + if (r < 0) + return log_debug_errno(r, "Failed to relinquish decrypted image: %m"); + } + + loop_device_relinquish(loop_device); + + return 0; +} + DEFINE_STRING_TABLE_LOOKUP(partition_designator, PartitionDesignator); diff --git a/src/shared/dissect-image.h b/src/shared/dissect-image.h index 3b30e08f90..5466de5042 100644 --- a/src/shared/dissect-image.h +++ b/src/shared/dissect-image.h @@ -161,3 +161,5 @@ bool dissected_image_can_do_verity(const DissectedImage *image, PartitionDesigna bool dissected_image_has_verity(const DissectedImage *image, PartitionDesignator d); int mount_image_privately_interactively(const char *path, DissectImageFlags flags, char **ret_directory, LoopDevice **ret_loop_device, DecryptedImage **ret_decrypted_image); + +int verity_dissect_and_mount(const char *src, const char *dest, const MountOptions *options); diff --git a/src/shared/mount-util.c b/src/shared/mount-util.c index 9d0d7c73df..4df391949b 100644 --- a/src/shared/mount-util.c +++ b/src/shared/mount-util.c @@ -1,6 +1,7 @@ /* SPDX-License-Identifier: LGPL-2.1-or-later */ #include <errno.h> +#include <linux/loop.h> #include <stdlib.h> #include <sys/mount.h> #include <sys/stat.h> @@ -8,6 +9,7 @@ #include <unistd.h> #include "alloc-util.h" +#include "dissect-image.h" #include "extract-word.h" #include "fd-util.h" #include "fileio.h" @@ -27,6 +29,7 @@ #include "string-util.h" #include "strv.h" #include "tmpfile-util.h" +#include "user-util.h" int mount_fd(const char *source, int target_fd, @@ -747,14 +750,16 @@ int mount_option_mangle( return 0; } -int bind_mount_in_namespace( +static int mount_in_namespace( pid_t target, const char *propagate_path, const char *incoming_path, const char *src, const char *dest, bool read_only, - bool make_file_or_directory) { + bool make_file_or_directory, + const MountOptions *options, + bool is_image) { _cleanup_close_pair_ int errno_pipe_fd[2] = { -1, -1 }; _cleanup_close_ int self_mntns_fd = -1, mntns_fd = -1, root_fd = -1, pidns_fd = -1, chased_src_fd = -1; @@ -772,6 +777,7 @@ int bind_mount_in_namespace( assert(incoming_path); assert(src); assert(dest); + assert(!options || is_image); r = namespace_open(target, &pidns_fd, &mntns_fd, NULL, NULL, &root_fd); if (r < 0) @@ -836,7 +842,10 @@ int bind_mount_in_namespace( /* Second, we mount the source file or directory to a directory inside of our MS_SLAVE playground. */ mount_tmp = strjoina(mount_slave, "/mount"); - r = make_mount_point_inode_from_stat(&st, mount_tmp, 0700); + if (is_image) + r = mkdir_p(mount_tmp, 0700); + else + r = make_mount_point_inode_from_stat(&st, mount_tmp, 0700); if (r < 0) { log_debug_errno(r, "Failed to create temporary mount point %s: %m", mount_tmp); goto finish; @@ -844,7 +853,10 @@ int bind_mount_in_namespace( mount_tmp_created = true; - r = mount_follow_verbose(LOG_DEBUG, chased_src, mount_tmp, NULL, MS_BIND, NULL); + if (is_image) + r = verity_dissect_and_mount(chased_src, mount_tmp, options); + else + r = mount_follow_verbose(LOG_DEBUG, chased_src, mount_tmp, NULL, MS_BIND, NULL); if (r < 0) goto finish; @@ -861,7 +873,7 @@ int bind_mount_in_namespace( * right-away. */ mount_outside = strjoina(propagate_path, "/XXXXXX"); - if (S_ISDIR(st.st_mode)) + if (is_image || S_ISDIR(st.st_mode)) r = mkdtemp(mount_outside) ? 0 : -errno; else { r = mkostemp_safe(mount_outside); @@ -881,7 +893,7 @@ int bind_mount_in_namespace( mount_outside_mounted = true; mount_tmp_mounted = false; - if (S_ISDIR(st.st_mode)) + if (is_image || S_ISDIR(st.st_mode)) (void) rmdir(mount_tmp); else (void) unlink(mount_tmp); @@ -908,8 +920,11 @@ int bind_mount_in_namespace( errno_pipe_fd[0] = safe_close(errno_pipe_fd[0]); if (make_file_or_directory) { - (void) mkdir_parents(dest, 0755); - (void) make_mount_point_inode_from_stat(&st, dest, 0700); + if (!is_image) { + (void) mkdir_parents(dest, 0755); + (void) make_mount_point_inode_from_stat(&st, dest, 0700); + } else + (void) mkdir_p(dest, 0755); } /* Fifth, move the mount to the right place inside */ @@ -946,7 +961,7 @@ finish: if (mount_outside_mounted) (void) umount_verbose(LOG_DEBUG, mount_outside, UMOUNT_NOFOLLOW); if (mount_outside_created) { - if (S_ISDIR(st.st_mode)) + if (is_image || S_ISDIR(st.st_mode)) (void) rmdir(mount_outside); else (void) unlink(mount_outside); @@ -955,7 +970,7 @@ finish: if (mount_tmp_mounted) (void) umount_verbose(LOG_DEBUG, mount_tmp, UMOUNT_NOFOLLOW); if (mount_tmp_created) { - if (S_ISDIR(st.st_mode)) + if (is_image || S_ISDIR(st.st_mode)) (void) rmdir(mount_tmp); else (void) unlink(mount_tmp); @@ -968,3 +983,28 @@ finish: return r; } + +int bind_mount_in_namespace( + pid_t target, + const char *propagate_path, + const char *incoming_path, + const char *src, + const char *dest, + bool read_only, + bool make_file_or_directory) { + + return mount_in_namespace(target, propagate_path, incoming_path, src, dest, read_only, make_file_or_directory, NULL, false); +} + +int mount_image_in_namespace( + pid_t target, + const char *propagate_path, + const char *incoming_path, + const char *src, + const char *dest, + bool read_only, + bool make_file_or_directory, + const MountOptions *options) { + + return mount_in_namespace(target, propagate_path, incoming_path, src, dest, read_only, make_file_or_directory, options, true); +} diff --git a/src/shared/mount-util.h b/src/shared/mount-util.h index fa36dd7875..849c37e85b 100644 --- a/src/shared/mount-util.h +++ b/src/shared/mount-util.h @@ -6,6 +6,7 @@ #include <unistd.h> #include "alloc-util.h" +#include "dissect-image.h" #include "errno-util.h" #include "macro.h" @@ -99,3 +100,4 @@ static inline char* umount_and_rmdir_and_free(char *p) { DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_rmdir_and_free); int bind_mount_in_namespace(pid_t target, const char *propagate_path, const char *incoming_path, const char *src, const char *dest, bool read_only, bool make_file_or_directory); +int mount_image_in_namespace(pid_t target, const char *propagate_path, const char *incoming_path, const char *src, const char *dest, bool read_only, bool make_file_or_directory, const MountOptions *options); diff --git a/src/systemctl/systemctl-mount.c b/src/systemctl/systemctl-mount.c index 513a876f21..646f9b77df 100644 --- a/src/systemctl/systemctl-mount.c +++ b/src/systemctl/systemctl-mount.c @@ -2,6 +2,7 @@ #include "bus-error.h" #include "bus-locator.h" +#include "dissect-image.h" #include "systemctl-mount.h" #include "systemctl-util.h" #include "systemctl.h" @@ -39,3 +40,77 @@ int mount_bind(int argc, char *argv[], void *userdata) { return 0; } + +int mount_image(int argc, char *argv[], void *userdata) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + const char *unit = argv[1], *src = argv[2], *dest = argv[3]; + _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; + _cleanup_free_ char *n = NULL; + sd_bus *bus; + int r; + + r = acquire_bus(BUS_MANAGER, &bus); + if (r < 0) + return r; + + polkit_agent_open_maybe(); + + r = unit_name_mangle(unit, arg_quiet ? 0 : UNIT_NAME_MANGLE_WARN, &n); + if (r < 0) + return log_error_errno(r, "Failed to mangle unit name: %m"); + + r = bus_message_new_method_call( + bus, + &m, + bus_systemd_mgr, + "MountImageUnit"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append( + m, + "sssbb", + n, + src, + dest, + arg_read_only, + arg_mkdir); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_open_container(m, 'a', "(ss)"); + if (r < 0) + return bus_log_create_error(r); + + if (argc > 4) { + _cleanup_free_ char *partition = NULL, *mount_options = NULL; + const char *options = argv[4]; + + r = extract_many_words(&options, ":", EXTRACT_CUNESCAPE|EXTRACT_UNESCAPE_SEPARATORS, &partition, &mount_options, NULL); + if (r < 0) + return r; + /* Single set of options, applying to the root partition/single filesystem */ + if (r == 1) { + r = sd_bus_message_append(m, "(ss)", "root", partition); + if (r < 0) + return bus_log_create_error(r); + } else if (r > 1) { + if (partition_designator_from_string(partition) < 0) + return bus_log_create_error(-EINVAL); + + r = sd_bus_message_append(m, "(ss)", partition, mount_options); + if (r < 0) + return bus_log_create_error(r); + } + } + + r = sd_bus_message_close_container(m); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_call(bus, m, -1, &error, NULL); + if (r < 0) + return log_error_errno(r, "Failed to mount image: %s", bus_error_message(&error, r)); + + return 0; +} diff --git a/src/systemctl/systemctl-mount.h b/src/systemctl/systemctl-mount.h index 1f9b3879fb..db0343f831 100644 --- a/src/systemctl/systemctl-mount.h +++ b/src/systemctl/systemctl-mount.h @@ -2,3 +2,4 @@ #pragma once int mount_bind(int argc, char *argv[], void *userdata); +int mount_image(int argc, char *argv[], void *userdata); diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c index 4726f65f97..4739faae39 100644 --- a/src/systemctl/systemctl.c +++ b/src/systemctl/systemctl.c @@ -162,6 +162,8 @@ static int systemctl_help(void) { " set-property UNIT PROPERTY=VALUE... Sets one or more properties of a unit\n" " bind UNIT PATH [PATH] Bind-mount a path from the host into a\n" " unit's namespace\n" + " mount-image UNIT PATH [PATH [OPTS]] Mount an image from the host into a\n" + " unit's namespace\n" " service-log-level SERVICE [LEVEL] Get/set logging threshold for service\n" " service-log-target SERVICE [TARGET] Get/set logging target for service\n" " reset-failed [PATTERN...] Reset failed state for all, one, or more\n" @@ -292,7 +294,7 @@ static int systemctl_help(void) { " 'utc': 'Day YYYY-MM-DD HH:MM:SS UTC\n" " 'us+utc': 'Day YYYY-MM-DD HH:MM:SS.UUUUUU UTC\n" " --read-only Create read-only bind mount\n" - " --mkdir Create directory before bind-mounting, if missing\n" + " --mkdir Create directory before mounting, if missing\n" "\nSee the %2$s for details.\n" , program_invocation_short_name , link @@ -1065,6 +1067,7 @@ static int systemctl_main(int argc, char *argv[]) { { "add-requires", 3, VERB_ANY, 0, add_dependency }, { "edit", 2, VERB_ANY, VERB_ONLINE_ONLY, edit }, { "bind", 3, 4, VERB_ONLINE_ONLY, mount_bind }, + { "mount-image", 4, 5, VERB_ONLINE_ONLY, mount_image }, {} }; |