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-rw-r--r--service/instance.c198
-rw-r--r--service/instance.h16
2 files changed, 213 insertions, 1 deletions
diff --git a/service/instance.c b/service/instance.c
index 7ebbded..8d2001a 100644
--- a/service/instance.c
+++ b/service/instance.c
@@ -15,12 +15,14 @@
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/socket.h>
+#include <sys/stat.h>
#include <net/if.h>
#include <unistd.h>
#include <stdint.h>
#include <fcntl.h>
#include <pwd.h>
#include <libgen.h>
+#include <unistd.h>
#include <libubox/md5.h>
@@ -45,6 +47,9 @@ enum {
INSTANCE_ATTR_USER,
INSTANCE_ATTR_STDOUT,
INSTANCE_ATTR_STDERR,
+ INSTANCE_ATTR_JAIL,
+ INSTANCE_ATTR_TRACE,
+ INSTANCE_ATTR_SECCOMP,
__INSTANCE_ATTR_MAX
};
@@ -63,6 +68,30 @@ static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
[INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING },
[INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL },
[INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL },
+ [INSTANCE_ATTR_JAIL] = { "jail", BLOBMSG_TYPE_TABLE },
+ [INSTANCE_ATTR_TRACE] = { "trace", BLOBMSG_TYPE_BOOL },
+ [INSTANCE_ATTR_SECCOMP] = { "seccomp", BLOBMSG_TYPE_STRING },
+};
+
+enum {
+ JAIL_ATTR_NAME,
+ JAIL_ATTR_ROOT,
+ JAIL_ATTR_PROCFS,
+ JAIL_ATTR_SYSFS,
+ JAIL_ATTR_UBUS,
+ JAIL_ATTR_LOG,
+ JAIL_ATTR_MOUNT,
+ __JAIL_ATTR_MAX,
+};
+
+static const struct blobmsg_policy jail_attr[__JAIL_ATTR_MAX] = {
+ [JAIL_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
+ [JAIL_ATTR_ROOT] = { "root", BLOBMSG_TYPE_STRING },
+ [JAIL_ATTR_PROCFS] = { "procfs", BLOBMSG_TYPE_BOOL },
+ [JAIL_ATTR_SYSFS] = { "sysfs", BLOBMSG_TYPE_BOOL },
+ [JAIL_ATTR_UBUS] = { "ubus", BLOBMSG_TYPE_BOOL },
+ [JAIL_ATTR_LOG] = { "log", BLOBMSG_TYPE_BOOL },
+ [JAIL_ATTR_MOUNT] = { "mount", BLOBMSG_TYPE_TABLE },
};
struct instance_netdev {
@@ -98,6 +127,8 @@ static const struct rlimit_name rlimit_names[] = {
{ NULL, 0 }
};
+static char trace[] = "/sbin/utrace";
+
static void closefd(int fd)
{
if (fd > STDERR_FILENO)
@@ -136,6 +167,57 @@ instance_limits(const char *limit, const char *value)
}
}
+static inline int
+jail_run(struct service_instance *in, char **argv)
+{
+ struct blobmsg_list_node *var;
+ struct jail *jail = &in->jail;
+ int argc = 0;
+
+ argv[argc++] = "/sbin/ujail";
+
+ if (jail->name) {
+ argv[argc++] = "-n";
+ argv[argc++] = jail->name;
+ }
+
+ if (jail->root) {
+ argv[argc++] = "-P";
+ argv[argc++] = jail->root;
+ }
+
+ if (in->seccomp) {
+ argv[argc++] = "-S";
+ argv[argc++] = in->seccomp;
+ }
+
+ if (jail->procfs)
+ argv[argc++] = "-p";
+
+ if (jail->sysfs)
+ argv[argc++] = "-s";
+
+ if (jail->ubus)
+ argv[argc++] = "-u";
+
+ if (jail->log)
+ argv[argc++] = "-l";
+
+ blobmsg_list_for_each(&jail->mount, var) {
+ const char *type = blobmsg_data(var->data);
+
+ if (*type == '1')
+ argv[argc++] = "-w";
+ else
+ argv[argc++] = "-r";
+ argv[argc++] = (char *) blobmsg_name(var->data);
+ }
+
+ argv[argc++] = "--";
+
+ return argc;
+}
+
static void
instance_run(struct service_instance *in, int _stdout, int _stderr)
{
@@ -154,12 +236,26 @@ instance_run(struct service_instance *in, int _stdout, int _stderr)
blobmsg_list_for_each(&in->env, var)
setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
+ if (!in->trace && !in->has_jail && in->seccomp) {
+ setenv("SECCOMP_FILE", in->seccomp, 1);
+ setenv("LD_PRELOAD", "/lib/libpreload-seccomp.so", 1);
+ }
+
blobmsg_list_for_each(&in->limits, var)
instance_limits(blobmsg_name(var->data), blobmsg_data(var->data));
- argv = alloca(sizeof(char *) * argc);
+ if (in->trace)
+ argc += 1;
+
+ argv = alloca(sizeof(char *) * (argc + in->jail.argc));
argc = 0;
+ if (in->trace)
+ argv[argc++] = trace;
+
+ if (in->has_jail)
+ argc = jail_run(in, argv);
+
blobmsg_for_each_attr(cur, in->command, rem)
argv[argc++] = blobmsg_data(cur);
@@ -404,6 +500,9 @@ instance_config_changed(struct service_instance *in, struct service_instance *in
if (!blobmsg_list_equal(&in->limits, &in_new->limits))
return true;
+ if (!blobmsg_list_equal(&in->jail.mount, &in_new->jail.mount))
+ return true;
+
if (!blobmsg_list_equal(&in->errors, &in_new->errors))
return true;
@@ -497,6 +596,59 @@ instance_fill_array(struct blobmsg_list *l, struct blob_attr *cur, blobmsg_updat
return true;
}
+static int
+instance_jail_parse(struct service_instance *in, struct blob_attr *attr)
+{
+ struct blob_attr *tb[__JAIL_ATTR_MAX];
+ struct jail *jail = &in->jail;
+ struct stat s;
+
+ if (stat("/sbin/ujail", &s))
+ return 0;
+
+ blobmsg_parse(jail_attr, __JAIL_ATTR_MAX, tb,
+ blobmsg_data(attr), blobmsg_data_len(attr));
+
+ jail->argc = 2;
+
+ if (tb[JAIL_ATTR_NAME]) {
+ jail->name = blobmsg_get_string(tb[JAIL_ATTR_NAME]);
+ jail->argc += 2;
+ }
+ if (tb[JAIL_ATTR_ROOT]) {
+ jail->root = blobmsg_get_string(tb[JAIL_ATTR_ROOT]);
+ jail->argc += 2;
+ }
+ if (tb[JAIL_ATTR_PROCFS]) {
+ jail->procfs = blobmsg_get_bool(tb[JAIL_ATTR_PROCFS]);
+ jail->argc++;
+ }
+ if (tb[JAIL_ATTR_SYSFS]) {
+ jail->sysfs = blobmsg_get_bool(tb[JAIL_ATTR_SYSFS]);
+ jail->argc++;
+ }
+ if (tb[JAIL_ATTR_UBUS]) {
+ jail->ubus = blobmsg_get_bool(tb[JAIL_ATTR_UBUS]);
+ jail->argc++;
+ }
+ if (tb[JAIL_ATTR_LOG]) {
+ jail->log = blobmsg_get_bool(tb[JAIL_ATTR_LOG]);
+ jail->argc++;
+ }
+ if (tb[JAIL_ATTR_MOUNT]) {
+ struct blob_attr *cur;
+ int rem;
+
+ blobmsg_for_each_attr(cur, tb[JAIL_ATTR_MOUNT], rem)
+ jail->argc += 2;
+ instance_fill_array(&jail->mount, tb[JAIL_ATTR_MOUNT], NULL, false);
+ }
+ if (in->seccomp)
+ jail->argc += 2;
+
+ return 1;
+}
+
static bool
instance_config_parse(struct service_instance *in)
{
@@ -568,6 +720,21 @@ instance_config_parse(struct service_instance *in)
}
}
+ if (tb[INSTANCE_ATTR_TRACE])
+ in->trace = blobmsg_get_bool(tb[INSTANCE_ATTR_TRACE]);
+
+ if (!in->trace && tb[INSTANCE_ATTR_SECCOMP]) {
+ char *seccomp = blobmsg_get_string(tb[INSTANCE_ATTR_SECCOMP]);
+ struct stat s;
+
+ if (stat(seccomp, &s))
+ ERROR("%s: not starting seccomp as %s is missing\n", in->name, seccomp);
+ else
+ in->seccomp = seccomp;
+ }
+ if (!in->trace && tb[INSTANCE_ATTR_JAIL])
+ in->has_jail = instance_jail_parse(in, tb[INSTANCE_ATTR_JAIL]);
+
if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT]))
in->_stdout.fd.fd = -1;
@@ -603,6 +770,7 @@ instance_config_cleanup(struct service_instance *in)
blobmsg_list_free(&in->file);
blobmsg_list_free(&in->limits);
blobmsg_list_free(&in->errors);
+ blobmsg_list_free(&in->jail.mount);
}
static void
@@ -615,6 +783,7 @@ instance_config_move(struct service_instance *in, struct service_instance *in_sr
blobmsg_list_move(&in->file, &in_src->file);
blobmsg_list_move(&in->limits, &in_src->limits);
blobmsg_list_move(&in->errors, &in_src->errors);
+ blobmsg_list_move(&in->jail.mount, &in_src->jail.mount);
in->trigger = in_src->trigger;
in->command = in_src->command;
in->name = in_src->name;
@@ -692,6 +861,7 @@ instance_init(struct service_instance *in, struct service *s, struct blob_attr *
blobmsg_list_simple_init(&in->data);
blobmsg_list_simple_init(&in->limits);
blobmsg_list_simple_init(&in->errors);
+ blobmsg_list_simple_init(&in->jail.mount);
in->valid = instance_config_parse(in);
}
@@ -745,6 +915,32 @@ void instance_dump(struct blob_buf *b, struct service_instance *in, int verbose)
blobmsg_close_table(b, r);
}
+ if (in->trace)
+ blobmsg_add_u8(b, "trace", true);
+
+ if (in->seccomp)
+ blobmsg_add_string(b, "seccomp", in->seccomp);
+
+ if (in->has_jail) {
+ void *r = blobmsg_open_table(b, "jail");
+ if (in->jail.name)
+ blobmsg_add_string(b, "name", in->jail.name);
+ if (in->jail.root)
+ blobmsg_add_string(b, "root", in->jail.root);
+ blobmsg_add_u8(b, "procfs", in->jail.procfs);
+ blobmsg_add_u8(b, "sysfs", in->jail.sysfs);
+ blobmsg_add_u8(b, "ubus", in->jail.ubus);
+ blobmsg_add_u8(b, "log", in->jail.log);
+ blobmsg_close_table(b, r);
+ if (!avl_is_empty(&in->jail.mount.avl)) {
+ struct blobmsg_list_node *var;
+ void *e = blobmsg_open_table(b, "mount");
+ blobmsg_list_for_each(&in->jail.mount, var)
+ blobmsg_add_string(b, blobmsg_name(var->data), blobmsg_data(var->data));
+ blobmsg_close_table(b, e);
+ }
+ }
+
if (verbose && in->trigger)
blobmsg_add_blob(b, in->trigger);
diff --git a/service/instance.h b/service/instance.h
index 93e18f9..3fb33e9 100644
--- a/service/instance.h
+++ b/service/instance.h
@@ -22,6 +22,17 @@
#define RESPAWN_ERROR (5 * 60)
+struct jail {
+ bool procfs;
+ bool sysfs;
+ bool ubus;
+ bool log;
+ char *name;
+ char *root;
+ struct blobmsg_list mount;
+ int argc;
+};
+
struct service_instance {
struct vlist_node node;
struct service *srv;
@@ -39,6 +50,11 @@ struct service_instance {
int respawn_count;
struct timespec start;
+ bool trace;
+ bool has_jail;
+ struct jail jail;
+ char *seccomp;
+
uint32_t respawn_timeout;
uint32_t respawn_threshold;
uint32_t respawn_retry;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 02:01:20 +0100