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-rw-r--r--man/systemd.exec.xml25
-rw-r--r--src/core/dbus-execute.c115
-rw-r--r--src/core/execute.c16
-rw-r--r--src/core/execute.h2
-rw-r--r--src/core/load-fragment-gperf.gperf.m42
-rw-r--r--src/core/load-fragment.c127
-rw-r--r--src/core/load-fragment.h1
-rw-r--r--src/core/namespace.c127
-rw-r--r--src/core/namespace.h44
-rw-r--r--src/shared/bus-unit-util.c70
-rw-r--r--src/test/test-ns.c1
11 files changed, 503 insertions, 27 deletions
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index f27e4a5c04..812e615530 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -968,6 +968,31 @@
</varlistentry>
<varlistentry>
+ <term><varname>BindPaths=</varname></term>
+ <term><varname>BindReadOnlyPaths=</varname></term>
+
+ <listitem><para>Configures unit-specific bind mounts. A bind mount makes a particular file or directory
+ available at an additional place in the unit's view of the file system. Any bind mounts created with this
+ option are specific to the unit, and are not visible in the host's mount table. This option expects a
+ whitespace separated list of bind mount definitions. Each definition consists of a colon-separated triple of
+ source path, destination path and option string, where the latter two are optional. If only a source path is
+ specified the source and destination is taken to be the same. The option string may be either
+ <literal>rbind</literal> or <literal>norbind</literal> for configuring a recursive or non-recursive bind
+ mount. If the destination parth is omitted, the option string must be omitted too.</para>
+
+ <para><varname>BindPaths=</varname> creates regular writable bind mounts (unless the source file system mount
+ is already marked read-only), while <varname>BindReadOnlyPaths=</varname> creates read-only bind mounts. These
+ settings may be used more than once, each usage appends to the unit's list of bind mounts. If the empty string
+ is assigned to either of these two options the entire list of bind mounts defined prior to this is reset. Note
+ that in this case both read-only and regular bind mounts are reset, regardless which of the two settings is
+ used.</para>
+
+ <para>This option is particularly useful when <varname>RootDirectory=</varname> is used. In this case the
+ source path refers to a path on the host file system, while the destination path referes to a path below the
+ root directory of the unit.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><varname>PrivateTmp=</varname></term>
<listitem><para>Takes a boolean argument. If true, sets up a new file system namespace for the executed
diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c
index 78b177e107..b3fc0ff5c3 100644
--- a/src/core/dbus-execute.c
+++ b/src/core/dbus-execute.c
@@ -675,6 +675,49 @@ static int property_get_output_fdname(
return sd_bus_message_append(reply, "s", name);
}
+static int property_get_bind_paths(
+ sd_bus *bus,
+ const char *path,
+ const char *interface,
+ const char *property,
+ sd_bus_message *reply,
+ void *userdata,
+ sd_bus_error *error) {
+
+ ExecContext *c = userdata;
+ unsigned i;
+ bool ro;
+ int r;
+
+ assert(bus);
+ assert(c);
+ assert(property);
+ assert(reply);
+
+ ro = !!strstr(property, "ReadOnly");
+
+ r = sd_bus_message_open_container(reply, 'a', "(ssbt)");
+ if (r < 0)
+ return r;
+
+ for (i = 0; i < c->n_bind_mounts; i++) {
+
+ if (ro != c->bind_mounts[i].read_only)
+ continue;
+
+ r = sd_bus_message_append(
+ reply, "(ssbt)",
+ c->bind_mounts[i].source,
+ c->bind_mounts[i].destination,
+ c->bind_mounts[i].ignore_enoent,
+ c->bind_mounts[i].recursive ? MS_REC : 0);
+ if (r < 0)
+ return r;
+ }
+
+ return sd_bus_message_close_container(reply);
+}
+
const sd_bus_vtable bus_exec_vtable[] = {
SD_BUS_VTABLE_START(0),
SD_BUS_PROPERTY("Environment", "as", NULL, offsetof(ExecContext, environment), SD_BUS_VTABLE_PROPERTY_CONST),
@@ -783,6 +826,8 @@ const sd_bus_vtable bus_exec_vtable[] = {
SD_BUS_PROPERTY("MemoryDenyWriteExecute", "b", bus_property_get_bool, offsetof(ExecContext, memory_deny_write_execute), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RestrictRealtime", "b", bus_property_get_bool, offsetof(ExecContext, restrict_realtime), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("RestrictNamespaces", "t", bus_property_get_ulong, offsetof(ExecContext, restrict_namespaces), SD_BUS_VTABLE_PROPERTY_CONST),
+ SD_BUS_PROPERTY("BindPaths", "a(ssbt)", property_get_bind_paths, 0, SD_BUS_VTABLE_PROPERTY_CONST),
+ SD_BUS_PROPERTY("BindReadOnlyPaths", "a(ssbt)", property_get_bind_paths, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_VTABLE_END
};
@@ -1364,8 +1409,8 @@ int bus_exec_context_set_transient_property(
if (r < 0)
return r;
- if (!isempty(path) && !path_is_absolute(path))
- return sd_bus_error_set_errnof(error, EINVAL, "Path %s is not absolute.", path);
+ if (!path_is_absolute(path))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not absolute.", path);
if (mode != UNIT_CHECK) {
char *buf = NULL;
@@ -1630,7 +1675,73 @@ int bus_exec_context_set_transient_property(
}
return 1;
+ } else if (STR_IN_SET(name, "BindPaths", "BindReadOnlyPaths")) {
+ unsigned empty = true;
+
+ r = sd_bus_message_enter_container(message, 'a', "(ssbt)");
+ if (r < 0)
+ return r;
+
+ while ((r = sd_bus_message_enter_container(message, 'r', "ssbt")) > 0) {
+ const char *source, *destination;
+ int ignore_enoent;
+ uint64_t mount_flags;
+
+ r = sd_bus_message_read(message, "ssbt", &source, &destination, &ignore_enoent, &mount_flags);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_exit_container(message);
+ if (r < 0)
+ return r;
+
+ if (!path_is_absolute(source))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Source path %s is not absolute.", source);
+ if (!path_is_absolute(destination))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Destination path %s is not absolute.", source);
+ if (!IN_SET(mount_flags, 0, MS_REC))
+ return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Unknown mount flags.");
+
+ if (mode != UNIT_CHECK) {
+ r = bind_mount_add(&c->bind_mounts, &c->n_bind_mounts,
+ &(BindMount) {
+ .source = strdup(source),
+ .destination = strdup(destination),
+ .read_only = !!strstr(name, "ReadOnly"),
+ .recursive = !!(mount_flags & MS_REC),
+ .ignore_enoent = ignore_enoent,
+ });
+ if (r < 0)
+ return r;
+
+ unit_write_drop_in_private_format(
+ u, mode, name,
+ "%s=%s%s:%s:%s",
+ name,
+ ignore_enoent ? "-" : "",
+ source,
+ destination,
+ (mount_flags & MS_REC) ? "rbind" : "norbind");
+ }
+
+ empty = false;
+ }
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_exit_container(message);
+ if (r < 0)
+ return r;
+
+ if (empty) {
+ bind_mount_free_many(c->bind_mounts, c->n_bind_mounts);
+ c->bind_mounts = NULL;
+ c->n_bind_mounts = 0;
+ }
+
+ return 1;
}
+
ri = rlimit_from_string(name);
if (ri < 0) {
soft = endswith(name, "Soft");
diff --git a/src/core/execute.c b/src/core/execute.c
index 07ab067c05..2ee8c9a416 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -1826,6 +1826,9 @@ static bool exec_needs_mount_namespace(
!strv_isempty(context->inaccessible_paths))
return true;
+ if (context->n_bind_mounts > 0)
+ return true;
+
if (context->mount_flags != 0)
return true;
@@ -2147,6 +2150,8 @@ static int apply_mount_namespace(Unit *u, const ExecContext *context,
r = setup_namespace(root_dir, &ns_info, rw,
context->read_only_paths,
context->inaccessible_paths,
+ context->bind_mounts,
+ context->n_bind_mounts,
tmp,
var,
context->protect_home,
@@ -3086,6 +3091,8 @@ void exec_context_done(ExecContext *c) {
c->read_write_paths = strv_free(c->read_write_paths);
c->inaccessible_paths = strv_free(c->inaccessible_paths);
+ bind_mount_free_many(c->bind_mounts, c->n_bind_mounts);
+
if (c->cpuset)
CPU_FREE(c->cpuset);
@@ -3569,6 +3576,15 @@ void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
fputs("\n", f);
}
+ if (c->n_bind_mounts > 0)
+ for (i = 0; i < c->n_bind_mounts; i++) {
+ fprintf(f, "%s%s: %s:%s:%s\n", prefix,
+ c->bind_mounts[i].read_only ? "BindReadOnlyPaths" : "BindPaths",
+ c->bind_mounts[i].source,
+ c->bind_mounts[i].destination,
+ c->bind_mounts[i].recursive ? "rbind" : "norbind");
+ }
+
if (c->utmp_id)
fprintf(f,
"%sUtmpIdentifier: %s\n",
diff --git a/src/core/execute.h b/src/core/execute.h
index 951c8f4da3..84ab4339cf 100644
--- a/src/core/execute.h
+++ b/src/core/execute.h
@@ -161,6 +161,8 @@ struct ExecContext {
char **read_write_paths, **read_only_paths, **inaccessible_paths;
unsigned long mount_flags;
+ BindMount *bind_mounts;
+ unsigned n_bind_mounts;
uint64_t capability_bounding_set;
uint64_t capability_ambient_set;
diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
index 2610442b91..15f22a2681 100644
--- a/src/core/load-fragment-gperf.gperf.m4
+++ b/src/core/load-fragment-gperf.gperf.m4
@@ -89,6 +89,8 @@ $1.InaccessibleDirectories, config_parse_namespace_path_strv, 0,
$1.ReadWritePaths, config_parse_namespace_path_strv, 0, offsetof($1, exec_context.read_write_paths)
$1.ReadOnlyPaths, config_parse_namespace_path_strv, 0, offsetof($1, exec_context.read_only_paths)
$1.InaccessiblePaths, config_parse_namespace_path_strv, 0, offsetof($1, exec_context.inaccessible_paths)
+$1.BindPaths, config_parse_bind_paths, 0, offsetof($1, exec_context)
+$1.BindReadOnlyPaths, config_parse_bind_paths, 0, offsetof($1, exec_context)
$1.PrivateTmp, config_parse_bool, 0, offsetof($1, exec_context.private_tmp)
$1.PrivateDevices, config_parse_bool, 0, offsetof($1, exec_context.private_devices)
$1.ProtectKernelTunables, config_parse_bool, 0, offsetof($1, exec_context.protect_kernel_tunables)
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index a2e7097de0..f325d853c6 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -3891,6 +3891,132 @@ int config_parse_namespace_path_strv(
return 0;
}
+int config_parse_bind_paths(
+ const char *unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ ExecContext *c = data;
+ const char *p;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if (isempty(rvalue)) {
+ /* Empty assignment resets the list */
+ bind_mount_free_many(c->bind_mounts, c->n_bind_mounts);
+ c->bind_mounts = NULL;
+ c->n_bind_mounts = 0;
+ return 0;
+ }
+
+ p = rvalue;
+ for (;;) {
+ _cleanup_free_ char *source = NULL, *destination = NULL;
+ char *s = NULL, *d = NULL;
+ bool rbind = true, ignore_enoent = false;
+
+ r = extract_first_word(&p, &source, ":" WHITESPACE, EXTRACT_QUOTES|EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r == 0)
+ break;
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse %s: %s", lvalue, rvalue);
+ return 0;
+ }
+
+ s = source;
+ if (s[0] == '-') {
+ ignore_enoent = true;
+ s++;
+ }
+
+ if (!utf8_is_valid(s)) {
+ log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, s);
+ return 0;
+ }
+ if (!path_is_absolute(s)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Not an absolute source path, ignoring: %s", s);
+ return 0;
+ }
+
+ path_kill_slashes(s);
+
+ /* Optionally, the destination is specified. */
+ if (p && p[-1] == ':') {
+ r = extract_first_word(&p, &destination, ":" WHITESPACE, EXTRACT_QUOTES|EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse %s: %s", lvalue, rvalue);
+ return 0;
+ }
+ if (r == 0) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Missing argument after ':': %s", rvalue);
+ return 0;
+ }
+
+ if (!utf8_is_valid(destination)) {
+ log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, destination);
+ return 0;
+ }
+ if (!path_is_absolute(destination)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Not an absolute destination path, ignoring: %s", destination);
+ return 0;
+ }
+
+ d = path_kill_slashes(destination);
+
+ /* Optionally, there's also a short option string specified */
+ if (p && p[-1] == ':') {
+ _cleanup_free_ char *options = NULL;
+
+ r = extract_first_word(&p, &options, NULL, EXTRACT_QUOTES);
+ if (r == -ENOMEM)
+ return log_oom();
+ if (r < 0) {
+ log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse %s: %s", lvalue, rvalue);
+ return 0;
+ }
+
+ if (isempty(options) || streq(options, "rbind"))
+ rbind = true;
+ else if (streq(options, "norbind"))
+ rbind = false;
+ else {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid option string, ignoring setting: %s", options);
+ return 0;
+ }
+ }
+ } else
+ d = s;
+
+ r = bind_mount_add(&c->bind_mounts, &c->n_bind_mounts,
+ &(BindMount) {
+ .source = s,
+ .destination = d,
+ .read_only = !!strstr(lvalue, "ReadOnly"),
+ .recursive = rbind,
+ .ignore_enoent = ignore_enoent,
+ });
+ if (r < 0)
+ return log_oom();
+ }
+
+ return 0;
+}
+
int config_parse_no_new_privileges(
const char* unit,
const char *filename,
@@ -4388,6 +4514,7 @@ void unit_dump_config_items(FILE *f) {
{ config_parse_sec, "SECONDS" },
{ config_parse_nsec, "NANOSECONDS" },
{ config_parse_namespace_path_strv, "PATH [...]" },
+ { config_parse_bind_paths, "PATH[:PATH[:OPTIONS]] [...]" },
{ config_parse_unit_requires_mounts_for, "PATH [...]" },
{ config_parse_exec_mount_flags, "MOUNTFLAG [...]" },
{ config_parse_unit_string_printf, "STRING" },
diff --git a/src/core/load-fragment.h b/src/core/load-fragment.h
index 1cff815a50..bbac2d84b5 100644
--- a/src/core/load-fragment.h
+++ b/src/core/load-fragment.h
@@ -117,6 +117,7 @@ int config_parse_sec_fix_0(const char *unit, const char *filename, unsigned line
int config_parse_user_group(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_user_group_strv(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
int config_parse_restrict_namespaces(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_bind_paths(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
/* gperf prototypes */
const struct ConfigPerfItem* load_fragment_gperf_lookup(const char *key, unsigned length);
diff --git a/src/core/namespace.c b/src/core/namespace.c
index 746ebc45b0..834883267c 100644
--- a/src/core/namespace.c
+++ b/src/core/namespace.c
@@ -50,6 +50,8 @@
typedef enum MountMode {
/* This is ordered by priority! */
INACCESSIBLE,
+ BIND_MOUNT,
+ BIND_MOUNT_RECURSIVE,
READONLY,
PRIVATE_TMP,
PRIVATE_VAR_TMP,
@@ -64,6 +66,8 @@ typedef struct MountEntry {
bool has_prefix:1; /* Already is prefixed by the root dir? */
bool read_only:1; /* Shall this mount point be read-only? */
char *path_malloc; /* Use this instead of 'path' if we had to allocate memory */
+ const char *source_const; /* The source path, for bind mounts */
+ char *source_malloc;
} MountEntry;
/*
@@ -166,6 +170,12 @@ static bool mount_entry_read_only(const MountEntry *p) {
return p->read_only || IN_SET(p->mode, READONLY, INACCESSIBLE);
}
+static const char *mount_entry_source(const MountEntry *p) {
+ assert(p);
+
+ return p->source_malloc ?: p->source_const;
+}
+
static int append_access_mounts(MountEntry **p, char **strv, MountMode mode) {
char **i;
@@ -201,6 +211,25 @@ static int append_access_mounts(MountEntry **p, char **strv, MountMode mode) {
return 0;
}
+static int append_bind_mounts(MountEntry **p, const BindMount *binds, unsigned n) {
+ unsigned i;
+
+ assert(p);
+
+ for (i = 0; i < n; i++) {
+ const BindMount *b = binds + i;
+
+ *((*p)++) = (MountEntry) {
+ .path_const = b->destination,
+ .mode = b->recursive ? BIND_MOUNT_RECURSIVE : BIND_MOUNT,
+ .read_only = b->read_only,
+ .source_const = b->source,
+ };
+ }
+
+ return 0;
+}
+
static int append_static_mounts(MountEntry **p, const MountEntry *mounts, unsigned n, bool ignore_protect) {
unsigned i;
@@ -568,27 +597,33 @@ fail:
return r;
}
-static int mount_entry_chase(MountEntry *m, const char *root_directory) {
+static int mount_entry_chase(
+ const char *root_directory,
+ MountEntry *m,
+ const char *path,
+ char **location) {
+
char *chased;
int r;
assert(m);
/* Since mount() will always follow symlinks and we need to take the different root directory into account we
- * chase the symlinks on our own first. */
+ * chase the symlinks on our own first. This is called for the destination path, as well as the source path (if
+ * that applies). The result is stored in "location". */
- r = chase_symlinks(mount_entry_path(m), root_directory, 0, &chased);
+ r = chase_symlinks(path, root_directory, 0, &chased);
if (r == -ENOENT && m->ignore) {
- log_debug_errno(r, "Path %s does not exist, ignoring.", mount_entry_path(m));
+ log_debug_errno(r, "Path %s does not exist, ignoring.", path);
return 0;
}
if (r < 0)
- return log_debug_errno(r, "Failed to follow symlinks on %s: %m", mount_entry_path(m));
+ return log_debug_errno(r, "Failed to follow symlinks on %s: %m", path);
- log_debug("Followed symlinks %s → %s.", mount_entry_path(m), chased);
+ log_debug("Followed symlinks %s → %s.", path, chased);
- free(m->path_malloc);
- m->path_malloc = chased;
+ free(*location);
+ *location = chased;
return 1;
}
@@ -600,11 +635,12 @@ static int apply_mount(
const char *var_tmp_dir) {
const char *what;
+ bool rbind = true;
int r;
assert(m);
- r = mount_entry_chase(m, root_directory);
+ r = mount_entry_chase(root_directory, m, mount_entry_path(m), &m->path_malloc);
if (r <= 0)
return r;
@@ -633,7 +669,6 @@ static int apply_mount(
case READONLY:
case READWRITE:
-
r = path_is_mount_point(mount_entry_path(m), root_directory, 0);
if (r < 0)
return log_debug_errno(r, "Failed to determine whether %s is already a mount point: %m", mount_entry_path(m));
@@ -643,6 +678,19 @@ static int apply_mount(
what = mount_entry_path(m);
break;
+ case BIND_MOUNT:
+ rbind = false;
+ /* fallthrough */
+
+ case BIND_MOUNT_RECURSIVE:
+ /* Also chase the source mount */
+ r = mount_entry_chase(root_directory, m, mount_entry_source(m), &m->source_malloc);
+ if (r <= 0)
+ return r;
+
+ what = mount_entry_source(m);
+ break;
+
case PRIVATE_TMP:
what = tmp_dir;
break;
@@ -660,7 +708,7 @@ static int apply_mount(
assert(what);
- if (mount(what, mount_entry_path(m), NULL, MS_BIND|MS_REC, NULL) < 0)
+ if (mount(what, mount_entry_path(m), NULL, MS_BIND|(rbind ? MS_REC : 0), NULL) < 0)
return log_debug_errno(errno, "Failed to mount %s to %s: %m", what, mount_entry_path(m));
log_debug("Successfully mounted %s to %s", what, mount_entry_path(m));
@@ -695,6 +743,8 @@ static unsigned namespace_calculate_mounts(
char** read_write_paths,
char** read_only_paths,
char** inaccessible_paths,
+ const BindMount *bind_mounts,
+ unsigned n_bind_mounts,
const char* tmp_dir,
const char* var_tmp_dir,
ProtectHome protect_home,
@@ -719,6 +769,7 @@ static unsigned namespace_calculate_mounts(
strv_length(read_write_paths) +
strv_length(read_only_paths) +
strv_length(inaccessible_paths) +
+ n_bind_mounts +
ns_info->private_dev +
(ns_info->protect_kernel_tunables ? ELEMENTSOF(protect_kernel_tunables_table) : 0) +
(ns_info->protect_control_groups ? 1 : 0) +
@@ -732,6 +783,8 @@ int setup_namespace(
char** read_write_paths,
char** read_only_paths,
char** inaccessible_paths,
+ const BindMount *bind_mounts,
+ unsigned n_bind_mounts,
const char* tmp_dir,
const char* var_tmp_dir,
ProtectHome protect_home,
@@ -751,6 +804,7 @@ int setup_namespace(
read_write_paths,
read_only_paths,
inaccessible_paths,
+ bind_mounts, n_bind_mounts,
tmp_dir, var_tmp_dir,
protect_home, protect_system);
@@ -772,6 +826,10 @@ int setup_namespace(
if (r < 0)
goto finish;
+ r = append_bind_mounts(&m, bind_mounts, n_bind_mounts);
+ if (r < 0)
+ goto finish;
+
if (tmp_dir) {
*(m++) = (MountEntry) {
.path_const = "/tmp",
@@ -911,6 +969,53 @@ finish:
return r;
}
+void bind_mount_free_many(BindMount *b, unsigned n) {
+ unsigned i;
+
+ assert(b || n == 0);
+
+ for (i = 0; i < n; i++) {
+ free(b[i].source);
+ free(b[i].destination);
+ }
+
+ free(b);
+}
+
+int bind_mount_add(BindMount **b, unsigned *n, const BindMount *item) {
+ _cleanup_free_ char *s = NULL, *d = NULL;
+ BindMount *c;
+
+ assert(b);
+ assert(n);
+ assert(item);
+
+ s = strdup(item->source);
+ if (!s)
+ return -ENOMEM;
+
+ d = strdup(item->destination);
+ if (!d)
+ return -ENOMEM;
+
+ c = realloc_multiply(*b, sizeof(BindMount), *n + 1);
+ if (!c)
+ return -ENOMEM;
+
+ *b = c;
+
+ c[(*n) ++] = (BindMount) {
+ .source = s,
+ .destination = d,
+ .read_only = item->read_only,
+ .recursive = item->recursive,
+ .ignore_enoent = item->ignore_enoent,
+ };
+
+ s = d = NULL;
+ return 0;
+}
+
static int setup_one_tmp_dir(const char *id, const char *prefix, char **path) {
_cleanup_free_ char *x = NULL;
char bid[SD_ID128_STRING_MAX];
diff --git a/src/core/namespace.h b/src/core/namespace.h
index 2c278fd457..de3edc419c 100644
--- a/src/core/namespace.h
+++ b/src/core/namespace.h
@@ -21,6 +21,7 @@
***/
typedef struct NameSpaceInfo NameSpaceInfo;
+typedef struct BindMount BindMount;
#include <stdbool.h>
@@ -51,20 +52,32 @@ struct NameSpaceInfo {
bool protect_kernel_modules:1;
};
-int setup_namespace(const char *chroot,
- const NameSpaceInfo *ns_info,
- char **read_write_paths,
- char **read_only_paths,
- char **inaccessible_paths,
- const char *tmp_dir,
- const char *var_tmp_dir,
- ProtectHome protect_home,
- ProtectSystem protect_system,
- unsigned long mount_flags);
-
-int setup_tmp_dirs(const char *id,
- char **tmp_dir,
- char **var_tmp_dir);
+struct BindMount {
+ char *source;
+ char *destination;
+ bool read_only:1;
+ bool recursive:1;
+ bool ignore_enoent:1;
+};
+
+int setup_namespace(
+ const char *root_directory,
+ const NameSpaceInfo *ns_info,
+ char **read_write_paths,
+ char **read_only_paths,
+ char **inaccessible_paths,
+ const BindMount *bind_mounts,
+ unsigned n_bind_mounts,
+ const char *tmp_dir,
+ const char *var_tmp_dir,
+ ProtectHome protect_home,
+ ProtectSystem protect_system,
+ unsigned long mount_flags);
+
+int setup_tmp_dirs(
+ const char *id,
+ char **tmp_dir,
+ char **var_tmp_dir);
int setup_netns(int netns_storage_socket[2]);
@@ -73,3 +86,6 @@ ProtectHome protect_home_from_string(const char *s) _pure_;
const char* protect_system_to_string(ProtectSystem p) _const_;
ProtectSystem protect_system_from_string(const char *s) _pure_;
+
+void bind_mount_free_many(BindMount *b, unsigned n);
+int bind_mount_add(BindMount **b, unsigned *n, const BindMount *item);
diff --git a/src/shared/bus-unit-util.c b/src/shared/bus-unit-util.c
index 6dd9f2ccd4..735b8effc9 100644
--- a/src/shared/bus-unit-util.c
+++ b/src/shared/bus-unit-util.c
@@ -590,6 +590,76 @@ int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignmen
}
r = sd_bus_message_append(m, "v", "t", f);
+ } else if (STR_IN_SET(field, "BindPaths", "BindReadOnlyPaths")) {
+ const char *p = eq;
+
+ r = sd_bus_message_open_container(m, 'v', "a(ssbt)");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_open_container(m, 'a', "(ssbt)");
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ _cleanup_free_ char *source = NULL, *destination = NULL;
+ char *s = NULL, *d = NULL;
+ bool ignore_enoent = false;
+ uint64_t flags = MS_REC;
+
+ r = extract_first_word(&p, &source, ":" WHITESPACE, EXTRACT_QUOTES|EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse argument: %m");
+ if (r == 0)
+ break;
+
+ s = source;
+ if (s[0] == '-') {
+ ignore_enoent = true;
+ s++;
+ }
+
+ if (p && p[-1] == ':') {
+ r = extract_first_word(&p, &destination, ":" WHITESPACE, EXTRACT_QUOTES|EXTRACT_DONT_COALESCE_SEPARATORS);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse argument: %m");
+ if (r == 0) {
+ log_error("Missing argument after ':': %s", eq);
+ return -EINVAL;
+ }
+
+ d = destination;
+
+ if (p && p[-1] == ':') {
+ _cleanup_free_ char *options = NULL;
+
+ r = extract_first_word(&p, &options, NULL, EXTRACT_QUOTES);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse argument: %m");
+
+ if (isempty(options) || streq(options, "rbind"))
+ flags = MS_REC;
+ else if (streq(options, "norbind"))
+ flags = 0;
+ else {
+ log_error("Unknown options: %s", eq);
+ return -EINVAL;
+ }
+ }
+ } else
+ d = s;
+
+
+ r = sd_bus_message_append(m, "(ssbt)", s, d, ignore_enoent, flags);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_bus_message_close_container(m);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_close_container(m);
} else {
log_error("Unknown assignment %s.", assignment);
return -EINVAL;
diff --git a/src/test/test-ns.c b/src/test/test-ns.c
index da7a8b0565..c99bcb371b 100644
--- a/src/test/test-ns.c
+++ b/src/test/test-ns.c
@@ -81,6 +81,7 @@ int main(int argc, char *argv[]) {
(char **) writable,
(char **) readonly,
(char **) inaccessible,
+ &(BindMount) { .source = (char*) "/usr/bin", .destination = (char*) "/etc/systemd", .read_only = true }, 1,
tmp_dir,
var_tmp_dir,
PROTECT_HOME_NO,
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-25 17:10:18 +0000