/*
* Copyright (C) 2015 John Crispin <blogic@openwrt.org>
+ * Copyright (C) 2020 Daniel Golle <daniel@makrotopia.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/wait.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+
+/* musl only defined 15 limit types, make sure all 16 are supported */
+#ifndef RLIMIT_RTTIME
+#define RLIMIT_RTTIME 15
+#undef RLIMIT_NLIMITS
+#define RLIMIT_NLIMITS 16
+#undef RLIM_NLIMITS
+#define RLIM_NLIMITS 16
+#endif
+#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
+#include <pwd.h>
+#include <grp.h>
#include <string.h>
-#include <sys/stat.h>
#include <fcntl.h>
-#include <libgen.h>
#include <sched.h>
+#include <linux/filter.h>
#include <linux/limits.h>
+#include <linux/nsfs.h>
+#include <linux/securebits.h>
+#include <signal.h>
+#include <inttypes.h>
#include "capabilities.h"
#include "elf.h"
#include "fs.h"
#include "jail.h"
#include "log.h"
+#include "seccomp-oci.h"
+#include "cgroups.h"
+#include <libubox/blobmsg.h>
+#include <libubox/blobmsg_json.h>
+#include <libubox/list.h>
+#include <libubox/vlist.h>
#include <libubox/uloop.h>
+#include <libubox/utils.h>
+#include <libubus.h>
+
+#ifndef CLONE_NEWCGROUP
+#define CLONE_NEWCGROUP 0x02000000
+#endif
#define STACK_SIZE (1024 * 1024)
-#define OPT_ARGS "S:C:n:h:r:w:d:psuloc"
+#define OPT_ARGS "S:C:n:h:r:w:d:psulocU:G:NR:fFO:T:EyJ:iP:"
+
+#define OCI_VERSION_STRING "1.0.2"
+
+struct hook_execvpe {
+ char *file;
+ char **argv;
+ char **envp;
+ int timeout;
+};
+
+struct sysctl_val {
+ char *entry;
+ char *value;
+};
+
+struct mknod_args {
+ char *path;
+ mode_t mode;
+ dev_t dev;
+ uid_t uid;
+ gid_t gid;
+};
static struct {
char *name;
char *hostname;
char **jail_argv;
+ char *cwd;
char *seccomp;
+ struct sock_fprog *ociseccomp;
char *capabilities;
+ struct jail_capset capset;
+ char *user;
+ char *group;
+ char *extroot;
+ char *overlaydir;
+ char *tmpoverlaysize;
+ char **envp;
+ char *uidmap;
+ char *gidmap;
+ char *pidfile;
+ struct sysctl_val **sysctl;
int no_new_privs;
int namespace;
+ struct {
+ int pid;
+ int net;
+ int ns;
+ int ipc;
+ int uts;
+ int user;
+ int cgroup;
+#ifdef CLONE_NEWTIME
+ int time;
+#endif
+ } setns;
int procfs;
int ronly;
int sysfs;
+ int console;
+ int pw_uid;
+ int pw_gid;
+ int gr_gid;
+ int root_map_uid;
+ gid_t *additional_gids;
+ size_t num_additional_gids;
+ mode_t umask;
+ bool set_umask;
+ int require_jail;
+ struct {
+ struct hook_execvpe **createRuntime;
+ struct hook_execvpe **createContainer;
+ struct hook_execvpe **startContainer;
+ struct hook_execvpe **poststart;
+ struct hook_execvpe **poststop;
+ } hooks;
+ struct rlimit *rlimits[RLIM_NLIMITS];
+ int oom_score_adj;
+ bool set_oom_score_adj;
+ struct mknod_args **devices;
+ char *ocibundle;
+ bool immediately;
+ struct blob_attr *annotations;
} opts;
+static struct blob_buf ocibuf;
+
extern int pivot_root(const char *new_root, const char *put_old);
int debug = 0;
static char child_stack[STACK_SIZE];
-static int mkdir_p(char *dir, mode_t mask)
+static struct ubus_context *parent_ctx;
+
+int console_fd;
+
+
+static inline bool has_namespaces(void)
{
- char *l = strrchr(dir, '/');
- int ret;
+return ((opts.setns.pid != -1) ||
+ (opts.setns.net != -1) ||
+ (opts.setns.ns != -1) ||
+ (opts.setns.ipc != -1) ||
+ (opts.setns.uts != -1) ||
+ (opts.setns.user != -1) ||
+ (opts.setns.cgroup != -1) ||
+#ifdef CLONE_NEWTIME
+ (opts.setns.time != -1) ||
+#endif
+ opts.namespace);
+}
- if (!l)
- return 0;
+static void free_oci_envp(char **p) {
+ char **tmp;
- *l = '\0';
+ if (p) {
+ tmp = p;
+ while (*tmp)
+ free(*(tmp++));
- if (mkdir_p(dir, mask))
- return -1;
+ free(p);
+ }
+}
+
+static void free_hooklist(struct hook_execvpe **hooklist)
+{
+ struct hook_execvpe *cur;
- *l = '/';
+ if (!hooklist)
+ return;
- ret = mkdir(dir, mask);
- if (ret && errno == EEXIST)
- return 0;
+ cur = *hooklist;
+ while (cur) {
+ free_oci_envp(cur->argv);
+ free_oci_envp(cur->envp);
+ free(cur->file);
+ free(cur++);
+ }
+ free(hooklist);
+}
+
+static void free_sysctl(void) {
+ struct sysctl_val *cur;
+ cur = *opts.sysctl;
+
+ while (cur) {
+ free(cur->entry);
+ free(cur->value);
+ free(cur++);
+ }
+ free(opts.sysctl);
+}
+
+static void free_devices(void) {
+ struct mknod_args **cur;
+
+ if (!opts.devices)
+ return;
- if (ret)
- ERROR("mkdir failed on %s: %s\n", dir, strerror(errno));
+ cur = opts.devices;
+ while (*cur) {
+ free((*cur)->path);
+ free(*(cur++));
+ }
+ free(opts.devices);
+}
+
+static void free_rlimits(void) {
+ int type;
+
+ for (type = 0; type < RLIM_NLIMITS; ++type)
+ free(opts.rlimits[type]);
+}
+
+static void free_opts(bool parent) {
+
+ free_library_search();
+ mount_free();
+ cgroups_free();
+
+ /* we need to keep argv, envp and seccomp filter in child */
+ if (parent) { /* parent-only */
+ if (opts.ociseccomp) {
+ free(opts.ociseccomp->filter);
+ free(opts.ociseccomp);
+ }
+
+ free_oci_envp(opts.jail_argv);
+ free_oci_envp(opts.envp);
+ }
+
+ free_rlimits();
+ free_sysctl();
+ free_devices();
+ free(opts.hostname);
+ free(opts.cwd);
+ free(opts.uidmap);
+ free(opts.gidmap);
+ free(opts.annotations);
+ free_hooklist(opts.hooks.createRuntime);
+ free_hooklist(opts.hooks.createContainer);
+ free_hooklist(opts.hooks.startContainer);
+ free_hooklist(opts.hooks.poststart);
+ free_hooklist(opts.hooks.poststop);
+}
+
+static int mount_overlay(char *jail_root, char *overlaydir) {
+ char *upperdir, *workdir, *optsstr, *upperetc, *upperresolvconf;
+ const char mountoptsformat[] = "lowerdir=%s,upperdir=%s,workdir=%s";
+ int ret = -1, fd;
+
+ if (asprintf(&upperdir, "%s%s", overlaydir, "/upper") < 0)
+ goto out;
+
+ if (asprintf(&workdir, "%s%s", overlaydir, "/work") < 0)
+ goto upper_printf;
+
+ if (asprintf(&optsstr, mountoptsformat, jail_root, upperdir, workdir) < 0)
+ goto work_printf;
+
+ if (mkdir_p(upperdir, 0755) || mkdir_p(workdir, 0755))
+ goto opts_printf;
+
+/*
+ * make sure /etc/resolv.conf exists in overlay and is owned by jail userns root
+ * this is to work-around a bug in overlayfs described in the overlayfs-userns
+ * patch:
+ * 3. modification of a file 'hithere' which is in l but not yet
+ * in u, and which is not owned by T, is not allowed, even if
+ * writes to u are allowed. This may be a bug in overlayfs,
+ * but it is safe behavior.
+ */
+ if (asprintf(&upperetc, "%s/etc", upperdir) < 0)
+ goto opts_printf;
+
+ if (mkdir_p(upperetc, 0755))
+ goto upper_etc_printf;
+
+ if (asprintf(&upperresolvconf, "%s/resolv.conf", upperetc) < 0)
+ goto upper_etc_printf;
+
+ fd = creat(upperresolvconf, 0644);
+ if (fd == -1) {
+ if (errno != EEXIST)
+ ERROR("creat(%s) failed: %m\n", upperresolvconf);
+ } else {
+ close(fd);
+ }
+ DEBUG("mount -t overlay %s %s (%s)\n", jail_root, jail_root, optsstr);
+
+ if (mount(jail_root, jail_root, "overlay", MS_NOATIME, optsstr))
+ goto upper_resolvconf_printf;
+
+ ret = 0;
+
+upper_resolvconf_printf:
+ free(upperresolvconf);
+upper_etc_printf:
+ free(upperetc);
+opts_printf:
+ free(optsstr);
+work_printf:
+ free(workdir);
+upper_printf:
+ free(upperdir);
+out:
return ret;
}
-int mount_bind(const char *root, const char *path, int readonly, int error)
+static void pass_console(int console_fd)
+{
+ struct ubus_context *child_ctx = ubus_connect(NULL);
+ static struct blob_buf req;
+ uint32_t id;
+
+ if (!child_ctx)
+ return;
+
+ blob_buf_init(&req, 0);
+ blobmsg_add_string(&req, "name", opts.name);
+
+ if (ubus_lookup_id(child_ctx, "container", &id) ||
+ ubus_invoke_fd(child_ctx, id, "console_set", req.head, NULL, NULL, 3000, console_fd))
+ INFO("ubus request failed\n");
+ else
+ close(console_fd);
+
+ blob_buf_free(&req);
+ ubus_free(child_ctx);
+}
+
+static int create_dev_console(const char *jail_root)
+{
+ char *console_fname;
+ char dev_console_path[PATH_MAX];
+ int slave_console_fd;
+
+ /* Open UNIX/98 virtual console */
+ console_fd = posix_openpt(O_RDWR | O_NOCTTY);
+ if (console_fd == -1)
+ return -1;
+
+ console_fname = ptsname(console_fd);
+ DEBUG("got console fd %d and PTS client name %s\n", console_fd, console_fname);
+ if (!console_fname)
+ goto no_console;
+
+ grantpt(console_fd);
+ unlockpt(console_fd);
+
+ /* pass PTY master to procd */
+ pass_console(console_fd);
+
+ /* mount-bind PTY slave to /dev/console in jail */
+ snprintf(dev_console_path, sizeof(dev_console_path), "%s/dev/console", jail_root);
+ close(creat(dev_console_path, 0620));
+
+ if (mount(console_fname, dev_console_path, "bind", MS_BIND, NULL))
+ goto no_console;
+
+ /* use PTY slave for stdio */
+ slave_console_fd = open(console_fname, O_RDWR); /* | O_NOCTTY */
+ dup2(slave_console_fd, 0);
+ dup2(slave_console_fd, 1);
+ dup2(slave_console_fd, 2);
+ close(slave_console_fd);
+
+ INFO("using guest console %s\n", console_fname);
+
+ return 0;
+
+no_console:
+ close(console_fd);
+ return 1;
+}
+
+static int hook_running = 0;
+static int hook_return_code = 0;
+static struct hook_execvpe **current_hook = NULL;
+typedef void (*hook_return_handler)(void);
+static hook_return_handler hook_return_cb = NULL;
+
+static void hook_process_timeout_cb(struct uloop_timeout *t);
+static struct uloop_timeout hook_process_timeout = {
+ .cb = hook_process_timeout_cb,
+};
+
+static void run_hooklist(void);
+static void hook_process_handler(struct uloop_process *c, int ret)
+{
+ uloop_timeout_cancel(&hook_process_timeout);
+
+ if (WIFEXITED(ret)) {
+ hook_return_code = WEXITSTATUS(ret);
+ if (hook_return_code)
+ ERROR("hook (%d) exited with exit: %d\n", c->pid, hook_return_code);
+ else
+ DEBUG("hook (%d) exited with exit: %d\n", c->pid, hook_return_code);
+
+ } else {
+ hook_return_code = WTERMSIG(ret);
+ ERROR("hook (%d) exited with signal: %d\n", c->pid, hook_return_code);
+ }
+ hook_running = 0;
+ ++current_hook;
+ run_hooklist();
+}
+
+static struct uloop_process hook_process = {
+ .cb = hook_process_handler,
+};
+
+static void hook_process_timeout_cb(struct uloop_timeout *t)
+{
+ DEBUG("hook process failed to stop, sending SIGKILL\n");
+ kill(hook_process.pid, SIGKILL);
+}
+
+static void run_hooklist(void)
{
+ struct hook_execvpe *hook = *current_hook;
struct stat s;
- char new[PATH_MAX];
- int fd;
- if (stat(path, &s)) {
- ERROR("stat(%s) failed: %s\n", path, strerror(errno));
- return error;
+ if (!hook)
+ hook_return_cb();
+
+ DEBUG("executing hook %s\n", hook->file);
+
+ if (stat(hook->file, &s))
+ hook_process_handler(&hook_process, ENOENT);
+
+ if (!((unsigned long)s.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
+ hook_process_handler(&hook_process, EPERM);
+
+ if (!((unsigned long)s.st_mode & (S_IRUSR | S_IRGRP | S_IROTH)))
+ hook_process_handler(&hook_process, EPERM);
+
+ hook_running = 1;
+ hook_process.pid = fork();
+ if (hook_process.pid == 0) {
+ /* child */
+ execve(hook->file, hook->argv, hook->envp);
+ ERROR("execve error %m\n");
+ _exit(errno);
+ } else if (hook_process.pid < 0) {
+ /* fork error */
+ ERROR("hook fork error\n");
+ hook_running = 0;
+ hook_process_handler(&hook_process, errno);
+ }
+
+ /* parent */
+ uloop_process_add(&hook_process);
+
+ if (hook->timeout > 0)
+ uloop_timeout_set(&hook_process_timeout, 1000 * hook->timeout);
+
+ uloop_run();
+ if (hook_running) {
+ DEBUG("uloop interrupted, killing jail process\n");
+ kill(hook_process.pid, SIGTERM);
+ uloop_timeout_set(&hook_process_timeout, 1000);
+ uloop_run();
+ }
+}
+
+static void run_hooks(struct hook_execvpe **hooklist, hook_return_handler return_cb)
+{
+ if (!hooklist)
+ return_cb();
+
+ current_hook = hooklist;
+ hook_return_cb = return_cb;
+
+ run_hooklist();
+}
+
+static int apply_sysctl(const char *jail_root)
+{
+ struct sysctl_val **cur;
+ char *procdir, *fname;
+ int f;
+
+ if (!opts.sysctl)
+ return 0;
+
+ asprintf(&procdir, "%s/proc", jail_root);
+ if (!procdir)
+ return ENOMEM;
+
+ mkdir(procdir, 0700);
+ if (mount("proc", procdir, "proc", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0))
+ return EPERM;
+
+ cur = opts.sysctl;
+
+ while (*cur) {
+ asprintf(&fname, "%s/sys/%s", procdir, (*cur)->entry);
+ if (!fname)
+ return ENOMEM;
+
+ DEBUG("sysctl: writing '%s' to %s\n", (*cur)->value, fname);
+
+ f = open(fname, O_WRONLY);
+ if (f == -1) {
+ ERROR("sysctl: can't open %s\n", fname);
+ return errno;
+ }
+ write(f, (*cur)->value, strlen((*cur)->value));
+
+ free(fname);
+ close(f);
+ ++cur;
+ }
+ umount(procdir);
+ rmdir(procdir);
+ free(procdir);
+
+ return 0;
+}
+
+/* glibc defines makedev calling a function. make sure it's a pure macro */
+#if defined(__GLIBC__)
+#undef makedev
+/* from musl's sys/sysmacros.h */
+#define makedev(x,y) ( \
+ (((x)&0xfffff000ULL) << 32) | \
+ (((x)&0x00000fffULL) << 8) | \
+ (((y)&0xffffff00ULL) << 12) | \
+ (((y)&0x000000ffULL)) )
+#endif
+
+static struct mknod_args default_devices[] = {
+ { .path = "/dev/null", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 3) },
+ { .path = "/dev/zero", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 5) },
+ { .path = "/dev/full", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 7) },
+ { .path = "/dev/random", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 8) },
+ { .path = "/dev/urandom", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH), .dev = makedev(1, 9) },
+ { .path = "/dev/tty", .mode = (S_IFCHR|S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP), .dev = makedev(5, 0), .gid = 5 },
+ { 0 },
+};
+
+static int create_devices(void)
+{
+ struct mknod_args **cur, *curdef;
+
+ if (!opts.devices)
+ goto only_default_devices;
+
+ cur = opts.devices;
+
+ while (*cur) {
+ DEBUG("creating %s (mode=%08o)\n", (*cur)->path, (*cur)->mode);
+ if (mknod((*cur)->path, (*cur)->mode, (*cur)->dev))
+ return errno;
+
+ if (((*cur)->uid || (*cur)->gid) &&
+ chown((*cur)->path, (*cur)->uid, (*cur)->gid))
+ return errno;
+
+ ++cur;
+ }
+
+only_default_devices:
+ curdef = default_devices;
+ while(curdef->path) {
+ DEBUG("creating %s (mode=%08o)\n", curdef->path, curdef->mode);
+ if (mknod(curdef->path, curdef->mode, curdef->dev)) {
+ ++curdef;
+ continue; /* may already exist, eg. due to a bind-mount */
+ }
+ if ((curdef->uid || curdef->gid) &&
+ chown(curdef->path, curdef->uid, curdef->gid))
+ return errno;
+
+ ++curdef;
+ }
+
+ /* Dev symbolic links as defined in OCI spec */
+ symlink("/dev/pts/ptmx", "/dev/ptmx");
+ symlink("/proc/self/fd", "/dev/fd");
+ symlink("/proc/self/fd/0", "/dev/stdin");
+ symlink("/proc/self/fd/1", "/dev/stdout");
+ symlink("/proc/self/fd/2", "/dev/stderr");
+
+ return 0;
+}
+
+static char jail_root[] = "/tmp/ujail-XXXXXX";
+static char tmpovdir[] = "/tmp/ujail-overlay-XXXXXX";
+static mode_t old_umask;
+static void enter_jail_fs(void);
+static int build_jail_fs(void)
+{
+ char *overlaydir = NULL;
+
+ old_umask = umask(0);
+
+ if (mkdtemp(jail_root) == NULL) {
+ ERROR("mkdtemp(%s) failed: %m\n", jail_root);
+ return -1;
}
- snprintf(new, sizeof(new), "%s%s", root, path);
- if (S_ISDIR(s.st_mode)) {
- mkdir_p(new, 0755);
+ if (apply_sysctl(jail_root)) {
+ ERROR("failed to apply sysctl values\n");
+ return -1;
+ }
+
+ /* oldroot can't be MS_SHARED else pivot_root() fails */
+ if (mount("none", "/", "none", MS_REC|MS_PRIVATE, NULL)) {
+ ERROR("private mount failed %m\n");
+ return -1;
+ }
+
+ if (opts.extroot) {
+ if (mount(opts.extroot, jail_root, "bind", MS_BIND, NULL)) {
+ ERROR("extroot mount failed %m\n");
+ return -1;
+ }
} else {
- mkdir_p(dirname(new), 0755);
- snprintf(new, sizeof(new), "%s%s", root, path);
- fd = creat(new, 0644);
- if (fd == -1) {
- ERROR("failed to create %s: %s\n", new, strerror(errno));
+ if (mount("tmpfs", jail_root, "tmpfs", MS_NOATIME, "mode=0755")) {
+ ERROR("tmpfs mount failed %m\n");
return -1;
}
- close(fd);
}
- if (mount(path, new, NULL, MS_BIND, NULL)) {
- ERROR("failed to mount -B %s %s: %s\n", path, new, strerror(errno));
- return -1;
+ if (opts.tmpoverlaysize) {
+ char mountoptsstr[] = "mode=0755,size=XXXXXXXX";
+
+ snprintf(mountoptsstr, sizeof(mountoptsstr),
+ "mode=0755,size=%s", opts.tmpoverlaysize);
+ if (mkdtemp(tmpovdir) == NULL) {
+ ERROR("mkdtemp(%s) failed: %m\n", jail_root);
+ return -1;
+ }
+ if (mount("tmpfs", tmpovdir, "tmpfs", MS_NOATIME,
+ mountoptsstr)) {
+ ERROR("failed to mount tmpfs for overlay (size=%s)\n", opts.tmpoverlaysize);
+ return -1;
+ }
+ overlaydir = tmpovdir;
+ }
+
+ if (opts.overlaydir)
+ overlaydir = opts.overlaydir;
+
+ if (overlaydir)
+ mount_overlay(jail_root, overlaydir);
+
+ if (chdir(jail_root)) {
+ ERROR("chdir(%s) (jail_root) failed: %m\n", jail_root);
+ return -1;
+ }
+
+ if (mount_all(jail_root)) {
+ ERROR("mount_all() failed\n");
+ return -1;
+ }
+
+ if (opts.console)
+ create_dev_console(jail_root);
+
+ /* make sure /etc/resolv.conf exists if in new network namespace */
+ if (opts.namespace & CLONE_NEWNET) {
+ char jailetc[PATH_MAX], jaillink[PATH_MAX];
+
+ snprintf(jailetc, PATH_MAX, "%s/etc", jail_root);
+ mkdir_p(jailetc, 0755);
+ snprintf(jaillink, PATH_MAX, "%s/etc/resolv.conf", jail_root);
+ if (overlaydir)
+ unlink(jaillink);
+
+ symlink("../dev/resolv.conf.d/resolv.conf.auto", jaillink);
+ }
+
+ run_hooks(opts.hooks.createContainer, enter_jail_fs);
+
+ return 0;
+}
+
+static bool exit_from_child;
+static void free_and_exit(int ret)
+{
+ if (!exit_from_child && opts.ocibundle)
+ cgroups_free();
+
+ if (!exit_from_child && parent_ctx)
+ ubus_free(parent_ctx);
+
+ free_opts(!exit_from_child);
+
+ exit(ret);
+}
+
+static void post_jail_fs(void);
+static void enter_jail_fs(void)
+{
+ char dirbuf[sizeof(jail_root) + 4];
+
+ snprintf(dirbuf, sizeof(dirbuf), "%s/old", jail_root);
+ mkdir(dirbuf, 0755);
+
+ if (pivot_root(jail_root, dirbuf) == -1) {
+ ERROR("pivot_root(%s, %s) failed: %m\n", jail_root, dirbuf);
+ free_and_exit(-1);
+ }
+ if (chdir("/")) {
+ ERROR("chdir(/) (after pivot_root) failed: %m\n");
+ free_and_exit(-1);
+ }
+
+ snprintf(dirbuf, sizeof(dirbuf), "/old%s", jail_root);
+ umount2(dirbuf, MNT_DETACH);
+ rmdir(dirbuf);
+ if (opts.tmpoverlaysize) {
+ char tmpdirbuf[sizeof(tmpovdir) + 4];
+ snprintf(tmpdirbuf, sizeof(tmpdirbuf), "/old%s", tmpovdir);
+ umount2(tmpdirbuf, MNT_DETACH);
+ rmdir(tmpdirbuf);
+ }
+
+ umount2("/old", MNT_DETACH);
+ rmdir("/old");
+
+ if (create_devices()) {
+ ERROR("create_devices() failed\n");
+ free_and_exit(-1);
+ }
+ if (opts.ronly)
+ mount(NULL, "/", "bind", MS_REMOUNT | MS_BIND | MS_RDONLY, 0);
+
+ umask(old_umask);
+ post_jail_fs();
+}
+
+static int write_uid_gid_map(pid_t child_pid, bool gidmap, char *mapstr)
+{
+ int map_file;
+ char map_path[64];
+
+ if (snprintf(map_path, sizeof(map_path), "/proc/%d/%s",
+ child_pid, gidmap?"gid_map":"uid_map") < 0)
+ return -1;
+
+ if ((map_file = open(map_path, O_WRONLY)) == -1)
+ return -1;
+
+ if (dprintf(map_file, "%s", mapstr)) {
+ close(map_file);
+ return -1;
+ }
+
+ close(map_file);
+ return 0;
+}
+
+static int write_single_uid_gid_map(pid_t child_pid, bool gidmap, int id)
+{
+ int map_file;
+ char map_path[64];
+ const char *map_format = "%d %d %d\n";
+ if (snprintf(map_path, sizeof(map_path), "/proc/%d/%s",
+ child_pid, gidmap?"gid_map":"uid_map") < 0)
+ return -1;
+
+ if ((map_file = open(map_path, O_WRONLY)) == -1)
+ return -1;
+
+ if (dprintf(map_file, map_format, 0, id, 1) == -1) {
+ close(map_file);
+ return -1;
+ }
+
+ close(map_file);
+ return 0;
+}
+
+static int write_setgroups(pid_t child_pid, bool allow)
+{
+ int setgroups_file;
+ char setgroups_path[64];
+
+ if (snprintf(setgroups_path, sizeof(setgroups_path), "/proc/%d/setgroups",
+ child_pid) < 0) {
+ return -1;
+ }
+
+ if ((setgroups_file = open(setgroups_path, O_WRONLY)) == -1) {
+ return -1;
+ }
+
+ if (dprintf(setgroups_file, "%s", allow?"allow":"deny") == -1) {
+ close(setgroups_file);
+ return -1;
+ }
+
+ close(setgroups_file);
+ return 0;
+}
+
+static void get_jail_user(int *user, int *user_gid, int *gr_gid)
+{
+ struct passwd *p = NULL;
+ struct group *g = NULL;
+
+ if (opts.user) {
+ p = getpwnam(opts.user);
+ if (!p) {
+ ERROR("failed to get uid/gid for user %s: %d (%s)\n",
+ opts.user, errno, strerror(errno));
+ free_and_exit(EXIT_FAILURE);
+ }
+ *user = p->pw_uid;
+ *user_gid = p->pw_gid;
+ } else {
+ *user = -1;
+ *user_gid = -1;
+ }
+
+ if (opts.group) {
+ g = getgrnam(opts.group);
+ if (!g) {
+ ERROR("failed to get gid for group %s: %m\n", opts.group);
+ free_and_exit(EXIT_FAILURE);
+ }
+ *gr_gid = g->gr_gid;
+ } else {
+ *gr_gid = -1;
+ }
+};
+
+static void set_jail_user(int pw_uid, int user_gid, int gr_gid)
+{
+ if (opts.user && (user_gid != -1) && initgroups(opts.user, user_gid)) {
+ ERROR("failed to initgroups() for user %s: %m\n", opts.user);
+ free_and_exit(EXIT_FAILURE);
+ }
+
+ if ((gr_gid != -1) && setregid(gr_gid, gr_gid)) {
+ ERROR("failed to set group id %d: %m\n", gr_gid);
+ free_and_exit(EXIT_FAILURE);
+ }
+
+ if ((pw_uid != -1) && setreuid(pw_uid, pw_uid)) {
+ ERROR("failed to set user id %d: %m\n", pw_uid);
+ free_and_exit(EXIT_FAILURE);
+ }
+}
+
+static int apply_rlimits(void)
+{
+ int resource;
+
+ for (resource = 0; resource < RLIM_NLIMITS; ++resource) {
+ if (opts.rlimits[resource])
+ DEBUG("applying limits to resource %u\n", resource);
+
+ if (opts.rlimits[resource] &&
+ setrlimit(resource, opts.rlimits[resource]))
+ return errno;
+ }
+
+ return 0;
+}
+
+#define MAX_ENVP 16
+static char** build_envp(const char *seccomp, char **ocienvp)
+{
+ static char *envp[MAX_ENVP];
+ static char preload_var[PATH_MAX];
+ static char seccomp_var[PATH_MAX];
+ static char seccomp_debug_var[20];
+ static char debug_var[] = "LD_DEBUG=all";
+ static char container_var[] = "container=ujail";
+ const char *preload_lib = find_lib("libpreload-seccomp.so");
+ char **addenv;
+
+ int count = 0;
+
+ if (seccomp && !preload_lib) {
+ ERROR("failed to add preload-lib to env\n");
+ return NULL;
+ }
+ if (seccomp) {
+ snprintf(seccomp_var, sizeof(seccomp_var), "SECCOMP_FILE=%s", seccomp);
+ envp[count++] = seccomp_var;
+ snprintf(seccomp_debug_var, sizeof(seccomp_debug_var), "SECCOMP_DEBUG=%2d", debug);
+ envp[count++] = seccomp_debug_var;
+ snprintf(preload_var, sizeof(preload_var), "LD_PRELOAD=%s", preload_lib);
+ envp[count++] = preload_var;
+ }
+
+ envp[count++] = container_var;
+
+ if (debug > 1)
+ envp[count++] = debug_var;
+
+ addenv = ocienvp;
+ while (addenv && *addenv) {
+ envp[count++] = *(addenv++);
+ if (count >= MAX_ENVP) {
+ ERROR("environment limited to %d extra records, truncating\n", MAX_ENVP);
+ break;
+ }
+ }
+ return envp;
+}
+
+static void usage(void)
+{
+ fprintf(stderr, "ujail <options> -- <binary> <params ...>\n");
+ fprintf(stderr, " -d <num>\tshow debug log (increase num to increase verbosity)\n");
+ fprintf(stderr, " -S <file>\tseccomp filter config\n");
+ fprintf(stderr, " -C <file>\tcapabilities drop config\n");
+ fprintf(stderr, " -c\t\tset PR_SET_NO_NEW_PRIVS\n");
+ fprintf(stderr, " -n <name>\tthe name of the jail\n");
+ fprintf(stderr, "namespace jail options:\n");
+ fprintf(stderr, " -h <hostname>\tchange the hostname of the jail\n");
+ fprintf(stderr, " -N\t\tjail has network namespace\n");
+ fprintf(stderr, " -f\t\tjail has user namespace\n");
+ fprintf(stderr, " -F\t\tjail has cgroups namespace\n");
+ fprintf(stderr, " -r <file>\treadonly files that should be staged\n");
+ fprintf(stderr, " -w <file>\twriteable files that should be staged\n");
+ fprintf(stderr, " -p\t\tjail has /proc\n");
+ fprintf(stderr, " -s\t\tjail has /sys\n");
+ fprintf(stderr, " -l\t\tjail has /dev/log\n");
+ fprintf(stderr, " -u\t\tjail has a ubus socket\n");
+ fprintf(stderr, " -U <name>\tuser to run jailed process\n");
+ fprintf(stderr, " -G <name>\tgroup to run jailed process\n");
+ fprintf(stderr, " -o\t\tremont jail root (/) read only\n");
+ fprintf(stderr, " -R <dir>\texternal jail rootfs (system container)\n");
+ fprintf(stderr, " -O <dir>\tdirectory for r/w overlayfs\n");
+ fprintf(stderr, " -T <size>\tuse tmpfs r/w overlayfs with <size>\n");
+ fprintf(stderr, " -E\t\tfail if jail cannot be setup\n");
+ fprintf(stderr, " -y\t\tprovide jail console\n");
+ fprintf(stderr, " -J <dir>\tcreate container from OCI bundle\n");
+ fprintf(stderr, " -i\t\tstart container immediately\n");
+ fprintf(stderr, " -P <pidfile>\tcreate <pidfile>\n");
+ fprintf(stderr, "\nWarning: by default root inside the jail is the same\n\
+and he has the same powers as root outside the jail,\n\
+thus he can escape the jail and/or break stuff.\n\
+Please use seccomp/capabilities (-S/-C) to restrict his powers\n\n\
+If you use none of the namespace jail options,\n\
+ujail will not use namespace/build a jail,\n\
+and will only drop capabilities/apply seccomp filter.\n\n");
+}
+
+static int* get_namespace_fd(const unsigned int nstype)
+{
+ switch (nstype) {
+ case CLONE_NEWPID:
+ return &opts.setns.pid;
+ case CLONE_NEWNET:
+ return &opts.setns.net;
+ case CLONE_NEWNS:
+ return &opts.setns.ns;
+ case CLONE_NEWIPC:
+ return &opts.setns.ipc;
+ case CLONE_NEWUTS:
+ return &opts.setns.uts;
+ case CLONE_NEWUSER:
+ return &opts.setns.user;
+ case CLONE_NEWCGROUP:
+ return &opts.setns.cgroup;
+#ifdef CLONE_NEWTIME
+ case CLONE_NEWTIME:
+ return &opts.setns.time;
+#endif
+ default:
+ return NULL;
+ }
+}
+
+static int setns_open(unsigned long nstype)
+{
+ int *fd = get_namespace_fd(nstype);
+
+ assert(fd != NULL);
+
+ if (*fd == -1)
+ return 0;
+
+ if (setns(*fd, nstype) == -1) {
+ close(*fd);
+ return errno;
+ }
+
+ close(*fd);
+ return 0;
+}
+
+static int jail_running = 0;
+static int jail_return_code = 0;
+
+static void jail_process_timeout_cb(struct uloop_timeout *t);
+static struct uloop_timeout jail_process_timeout = {
+ .cb = jail_process_timeout_cb,
+};
+static void poststop(void);
+static void jail_process_handler(struct uloop_process *c, int ret)
+{
+ uloop_timeout_cancel(&jail_process_timeout);
+ if (WIFEXITED(ret)) {
+ jail_return_code = WEXITSTATUS(ret);
+ INFO("jail (%d) exited with exit: %d\n", c->pid, jail_return_code);
+ } else {
+ jail_return_code = WTERMSIG(ret);
+ INFO("jail (%d) exited with signal: %d\n", c->pid, jail_return_code);
+ }
+ jail_running = 0;
+ poststop();
+}
+
+static struct uloop_process jail_process = {
+ .cb = jail_process_handler,
+};
+
+static void jail_process_timeout_cb(struct uloop_timeout *t)
+{
+ DEBUG("jail process failed to stop, sending SIGKILL\n");
+ kill(jail_process.pid, SIGKILL);
+}
+
+static void jail_handle_signal(int signo)
+{
+ if (hook_running) {
+ DEBUG("forwarding signal %d to the hook process\n", signo);
+ kill(hook_process.pid, signo);
+ }
+
+ if (jail_running) {
+ DEBUG("forwarding signal %d to the jailed process\n", signo);
+ kill(jail_process.pid, signo);
+ }
+}
+
+static void signals_init(void)
+{
+ int i;
+ sigset_t sigmask;
+
+ sigfillset(&sigmask);
+ for (i = 0; i < _NSIG; i++) {
+ struct sigaction s = { 0 };
+
+ if (!sigismember(&sigmask, i))
+ continue;
+ if ((i == SIGCHLD) || (i == SIGPIPE) || (i == SIGSEGV))
+ continue;
+
+ s.sa_handler = jail_handle_signal;
+ sigaction(i, &s, NULL);
+ }
+}
+
+static void pre_exec_jail(struct uloop_timeout *t);
+static struct uloop_timeout pre_exec_timeout = {
+ .cb = pre_exec_jail,
+};
+
+int pipes[4];
+static int exec_jail(void *arg)
+{
+ char buf[1];
+
+ exit_from_child = true;
+ prctl(PR_SET_SECUREBITS, 0);
+
+ uloop_init();
+ signals_init();
+
+ close(pipes[0]);
+ close(pipes[3]);
+
+ setns_open(CLONE_NEWUSER);
+ setns_open(CLONE_NEWNET);
+ setns_open(CLONE_NEWNS);
+ setns_open(CLONE_NEWIPC);
+ setns_open(CLONE_NEWUTS);
+
+ buf[0] = 'i';
+ if (write(pipes[1], buf, 1) < 1) {
+ ERROR("can't write to parent\n");
+ return EXIT_FAILURE;
+ }
+ close(pipes[1]);
+ if (read(pipes[2], buf, 1) < 1) {
+ ERROR("can't read from parent\n");
+ return EXIT_FAILURE;
+ }
+ if (buf[0] != 'O') {
+ ERROR("parent had an error, child exiting\n");
+ return EXIT_FAILURE;
+ }
+
+ if (opts.namespace & CLONE_NEWCGROUP)
+ unshare(CLONE_NEWCGROUP);
+
+ setns_open(CLONE_NEWCGROUP);
+
+ if ((opts.namespace & CLONE_NEWUSER) || (opts.setns.user != -1)) {
+ if (setregid(0, 0) < 0) {
+ ERROR("setgid\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+ if (setreuid(0, 0) < 0) {
+ ERROR("setuid\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+ if (setgroups(0, NULL) < 0) {
+ ERROR("setgroups\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+ }
+
+ if (opts.namespace && opts.hostname && strlen(opts.hostname) > 0
+ && sethostname(opts.hostname, strlen(opts.hostname))) {
+ ERROR("sethostname(%s) failed: %m\n", opts.hostname);
+ free_and_exit(EXIT_FAILURE);
+ }
+
+ uloop_timeout_add(&pre_exec_timeout);
+ uloop_run();
+
+ free_and_exit(-1);
+ return -1;
+}
+
+static void pre_exec_jail(struct uloop_timeout *t)
+{
+ if ((opts.namespace & CLONE_NEWNS) && build_jail_fs()) {
+ ERROR("failed to build jail fs\n");
+ free_and_exit(EXIT_FAILURE);
+ } else {
+ run_hooks(opts.hooks.createContainer, post_jail_fs);
+ }
+}
+
+static void post_start_hook(void);
+static void post_jail_fs(void)
+{
+ char buf[1];
+
+ if (read(pipes[2], buf, 1) < 1) {
+ ERROR("can't read from parent\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+ if (buf[0] != '!') {
+ ERROR("parent had an error, child exiting\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+ close(pipes[2]);
+
+ run_hooks(opts.hooks.startContainer, post_start_hook);
+}
+
+static void post_start_hook(void)
+{
+ int pw_uid, pw_gid, gr_gid;
+
+ /*
+ * make sure setuid/setgid won't drop capabilities in case capabilities
+ * have been specified explicitely.
+ */
+ if (opts.capset.apply) {
+ if (prctl(PR_SET_SECUREBITS, SECBIT_NO_SETUID_FIXUP)) {
+ ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+ }
+
+ /* drop capabilities, retain those still needed to further setup jail */
+ if (applyOCIcapabilities(opts.capset, (1LLU << CAP_SETGID) | (1LLU << CAP_SETUID) | (1LLU << CAP_SETPCAP)))
+ free_and_exit(EXIT_FAILURE);
+
+ /* use either cmdline-supplied user/group or uid/gid from OCI spec */
+ get_jail_user(&pw_uid, &pw_gid, &gr_gid);
+ set_jail_user(opts.pw_uid?:pw_uid, opts.pw_gid?:pw_gid, opts.gr_gid?:gr_gid);
+
+ if (opts.additional_gids &&
+ (setgroups(opts.num_additional_gids, opts.additional_gids) < 0)) {
+ ERROR("setgroups failed: %m\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+
+ if (opts.set_umask)
+ umask(opts.umask);
+
+ /* restore securebits back to normal (and lock them if not in userns) */
+ if (opts.capset.apply) {
+ if (prctl(PR_SET_SECUREBITS, (opts.namespace & CLONE_NEWUSER)?0:
+ SECBIT_KEEP_CAPS_LOCKED|SECBIT_NO_SETUID_FIXUP_LOCKED|SECBIT_NOROOT_LOCKED)) {
+ ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+ }
+
+ /* drop remaining capabilities to end up with specified sets */
+ if (applyOCIcapabilities(opts.capset, 0))
+ free_and_exit(EXIT_FAILURE);
+
+ if (opts.no_new_privs && prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
+ ERROR("prctl(PR_SET_NO_NEW_PRIVS) failed: %m\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+
+ char **envp = build_envp(opts.seccomp, opts.envp);
+ if (!envp)
+ free_and_exit(EXIT_FAILURE);
+
+ if (opts.cwd && chdir(opts.cwd))
+ free_and_exit(EXIT_FAILURE);
+
+ if (opts.ociseccomp && applyOCIlinuxseccomp(opts.ociseccomp))
+ free_and_exit(EXIT_FAILURE);
+
+ uloop_end();
+ free_opts(false);
+ INFO("exec-ing %s\n", *opts.jail_argv);
+ if (opts.envp) /* respect PATH if potentially set in ENV */
+ execvpe(*opts.jail_argv, opts.jail_argv, envp);
+ else
+ execve(*opts.jail_argv, opts.jail_argv, envp);
+
+ /* we get there only if execve fails */
+ ERROR("failed to execve %s: %m\n", *opts.jail_argv);
+ exit(EXIT_FAILURE);
+}
+
+static int ns_open_pid(const char *nstype, const pid_t target_ns)
+{
+ char pid_pid_path[PATH_MAX];
+
+ snprintf(pid_pid_path, sizeof(pid_pid_path), "/proc/%u/ns/%s", target_ns, nstype);
+
+ return open(pid_pid_path, O_RDONLY);
+}
+
+static void netns_updown(pid_t pid, bool start)
+{
+ static struct blob_buf req;
+ uint32_t id;
+
+ if (!parent_ctx)
+ return;
+
+ blob_buf_init(&req, 0);
+ blobmsg_add_string(&req, "jail", opts.name);
+ blobmsg_add_u32(&req, "pid", pid);
+ blobmsg_add_u8(&req, "start", start);
+
+ if (ubus_lookup_id(parent_ctx, "network", &id) ||
+ ubus_invoke(parent_ctx, id, "netns_updown", req.head, NULL, NULL, 3000))
+ INFO("ubus request failed\n");
+
+ blob_buf_free(&req);
+}
+
+static int parseOCIenvarray(struct blob_attr *msg, char ***envp)
+{
+ struct blob_attr *cur;
+ int sz = 0, rem;
+
+ blobmsg_for_each_attr(cur, msg, rem)
+ ++sz;
+
+ if (sz > 0) {
+ *envp = calloc(1 + sz, sizeof(char*));
+ if (!(*envp))
+ return ENOMEM;
+ } else {
+ *envp = NULL;
+ return 0;
+ }
+
+ sz = 0;
+ blobmsg_for_each_attr(cur, msg, rem)
+ (*envp)[sz++] = strdup(blobmsg_get_string(cur));
+
+ if (sz)
+ (*envp)[sz] = NULL;
+
+ return 0;
+}
+
+enum {
+ OCI_ROOT_PATH,
+ OCI_ROOT_READONLY,
+ __OCI_ROOT_MAX,
+};
+
+static const struct blobmsg_policy oci_root_policy[] = {
+ [OCI_ROOT_PATH] = { "path", BLOBMSG_TYPE_STRING },
+ [OCI_ROOT_READONLY] = { "readonly", BLOBMSG_TYPE_BOOL },
+};
+
+static int parseOCIroot(const char *jsonfile, struct blob_attr *msg)
+{
+ static char extroot[PATH_MAX] = { 0 };
+ struct blob_attr *tb[__OCI_ROOT_MAX];
+ char *cur;
+ char *root_path;
+
+ blobmsg_parse(oci_root_policy, __OCI_ROOT_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
+
+ if (!tb[OCI_ROOT_PATH])
+ return ENODATA;
+
+ root_path = blobmsg_get_string(tb[OCI_ROOT_PATH]);
+
+ /* prepend bundle directory in case of relative paths */
+ if (root_path[0] != '/') {
+ strncpy(extroot, jsonfile, PATH_MAX);
+ cur = strrchr(extroot, '/');
+
+ if (!cur)
+ return ENOTDIR;
+
+ *(++cur) = '\0';
+ }
+
+ strncat(extroot, root_path, PATH_MAX - (strlen(extroot) + 1));
+
+ opts.extroot = extroot;
+
+ if (tb[OCI_ROOT_READONLY])
+ opts.ronly = blobmsg_get_bool(tb[OCI_ROOT_READONLY]);
+
+ return 0;
+}
+
+
+enum {
+ OCI_HOOK_PATH,
+ OCI_HOOK_ARGS,
+ OCI_HOOK_ENV,
+ OCI_HOOK_TIMEOUT,
+ __OCI_HOOK_MAX,
+};
+
+static const struct blobmsg_policy oci_hook_policy[] = {
+ [OCI_HOOK_PATH] = { "path", BLOBMSG_TYPE_STRING },
+ [OCI_HOOK_ARGS] = { "args", BLOBMSG_TYPE_ARRAY },
+ [OCI_HOOK_ENV] = { "env", BLOBMSG_TYPE_ARRAY },
+ [OCI_HOOK_TIMEOUT] = { "timeout", BLOBMSG_TYPE_INT32 },
+};
+
+
+static int parseOCIhook(struct hook_execvpe ***hooklist, struct blob_attr *msg)
+{
+ struct blob_attr *tb[__OCI_HOOK_MAX];
+ struct blob_attr *cur;
+ int rem, ret = 0;
+ int idx = 0;
+
+ blobmsg_for_each_attr(cur, msg, rem)
+ ++idx;
+
+ if (!idx)
+ return 0;
+
+ *hooklist = calloc(idx + 1, sizeof(struct hook_execvpe *));
+ idx = 0;
+
+ if (!(*hooklist))
+ return ENOMEM;
+
+ blobmsg_for_each_attr(cur, msg, rem) {
+ blobmsg_parse(oci_hook_policy, __OCI_HOOK_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
+
+ if (!tb[OCI_HOOK_PATH]) {
+ ret = EINVAL;
+ goto errout;
+ }
+
+ (*hooklist)[idx] = calloc(1, sizeof(struct hook_execvpe));
+ if (tb[OCI_HOOK_ARGS]) {
+ ret = parseOCIenvarray(tb[OCI_HOOK_ARGS], &((*hooklist)[idx]->argv));
+ if (ret)
+ goto errout;
+ } else {
+ (*hooklist)[idx]->argv = calloc(2, sizeof(char *));
+ ((*hooklist)[idx]->argv)[0] = strdup(blobmsg_get_string(tb[OCI_HOOK_PATH]));
+ ((*hooklist)[idx]->argv)[1] = NULL;
+ };
+
+
+ if (tb[OCI_HOOK_ENV]) {
+ ret = parseOCIenvarray(tb[OCI_HOOK_ENV], &((*hooklist)[idx]->envp));
+ if (ret)
+ goto errout;
+ }
+
+ if (tb[OCI_HOOK_TIMEOUT])
+ (*hooklist)[idx]->timeout = blobmsg_get_u32(tb[OCI_HOOK_TIMEOUT]);
+
+ (*hooklist)[idx]->file = strdup(blobmsg_get_string(tb[OCI_HOOK_PATH]));
+
+ ++idx;
+ }
+
+ (*hooklist)[idx] = NULL;
+
+ DEBUG("added %d hooks\n", idx);
+
+ return 0;
+
+errout:
+ free_hooklist(*hooklist);
+ *hooklist = NULL;
+
+ return ret;
+};
+
+
+enum {
+ OCI_HOOKS_PRESTART,
+ OCI_HOOKS_CREATERUNTIME,
+ OCI_HOOKS_CREATECONTAINER,
+ OCI_HOOKS_STARTCONTAINER,
+ OCI_HOOKS_POSTSTART,
+ OCI_HOOKS_POSTSTOP,
+ __OCI_HOOKS_MAX,
+};
+
+static const struct blobmsg_policy oci_hooks_policy[] = {
+ [OCI_HOOKS_PRESTART] = { "prestart", BLOBMSG_TYPE_ARRAY },
+ [OCI_HOOKS_CREATERUNTIME] = { "createRuntime", BLOBMSG_TYPE_ARRAY },
+ [OCI_HOOKS_CREATECONTAINER] = { "createContainer", BLOBMSG_TYPE_ARRAY },
+ [OCI_HOOKS_STARTCONTAINER] = { "startContainer", BLOBMSG_TYPE_ARRAY },
+ [OCI_HOOKS_POSTSTART] = { "poststart", BLOBMSG_TYPE_ARRAY },
+ [OCI_HOOKS_POSTSTOP] = { "poststop", BLOBMSG_TYPE_ARRAY },
+};
+
+static int parseOCIhooks(struct blob_attr *msg)
+{
+ struct blob_attr *tb[__OCI_HOOKS_MAX];
+ int ret;
+
+ blobmsg_parse(oci_hooks_policy, __OCI_HOOKS_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
+
+ if (tb[OCI_HOOKS_PRESTART])
+ INFO("warning: ignoring deprecated prestart hook\n");
+
+ if (tb[OCI_HOOKS_CREATERUNTIME]) {
+ ret = parseOCIhook(&opts.hooks.createRuntime, tb[OCI_HOOKS_CREATERUNTIME]);
+ if (ret)
+ return ret;
+ }
+
+ if (tb[OCI_HOOKS_CREATECONTAINER]) {
+ ret = parseOCIhook(&opts.hooks.createContainer, tb[OCI_HOOKS_CREATECONTAINER]);
+ if (ret)
+ goto out_createruntime;
+ }
+
+ if (tb[OCI_HOOKS_STARTCONTAINER]) {
+ ret = parseOCIhook(&opts.hooks.startContainer, tb[OCI_HOOKS_STARTCONTAINER]);
+ if (ret)
+ goto out_createcontainer;
+ }
+
+ if (tb[OCI_HOOKS_POSTSTART]) {
+ ret = parseOCIhook(&opts.hooks.poststart, tb[OCI_HOOKS_POSTSTART]);
+ if (ret)
+ goto out_startcontainer;
+ }
+
+ if (tb[OCI_HOOKS_POSTSTOP]) {
+ ret = parseOCIhook(&opts.hooks.poststop, tb[OCI_HOOKS_POSTSTOP]);
+ if (ret)
+ goto out_poststart;
+ }
+
+ return 0;
+
+out_poststart:
+ free_hooklist(opts.hooks.poststart);
+out_startcontainer:
+ free_hooklist(opts.hooks.startContainer);
+out_createcontainer:
+ free_hooklist(opts.hooks.createContainer);
+out_createruntime:
+ free_hooklist(opts.hooks.createRuntime);
+
+ return ret;
+};
+
+
+enum {
+ OCI_PROCESS_USER_UID,
+ OCI_PROCESS_USER_GID,
+ OCI_PROCESS_USER_UMASK,
+ OCI_PROCESS_USER_ADDITIONALGIDS,
+ __OCI_PROCESS_USER_MAX,
+};
+
+static const struct blobmsg_policy oci_process_user_policy[] = {
+ [OCI_PROCESS_USER_UID] = { "uid", BLOBMSG_TYPE_INT32 },
+ [OCI_PROCESS_USER_GID] = { "gid", BLOBMSG_TYPE_INT32 },
+ [OCI_PROCESS_USER_UMASK] = { "umask", BLOBMSG_TYPE_INT32 },
+ [OCI_PROCESS_USER_ADDITIONALGIDS] = { "additionalGids", BLOBMSG_TYPE_ARRAY },
+};
+
+static int parseOCIprocessuser(struct blob_attr *msg) {
+ struct blob_attr *tb[__OCI_PROCESS_USER_MAX];
+ struct blob_attr *cur;
+ int rem;
+ int has_gid = 0;
+
+ blobmsg_parse(oci_process_user_policy, __OCI_PROCESS_USER_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
+
+ if (tb[OCI_PROCESS_USER_UID])
+ opts.pw_uid = blobmsg_get_u32(tb[OCI_PROCESS_USER_UID]);
+
+ if (tb[OCI_PROCESS_USER_GID]) {
+ opts.pw_gid = blobmsg_get_u32(tb[OCI_PROCESS_USER_GID]);
+ opts.gr_gid = blobmsg_get_u32(tb[OCI_PROCESS_USER_GID]);
+ has_gid = 1;
+ }
+
+ if (tb[OCI_PROCESS_USER_ADDITIONALGIDS]) {
+ size_t gidcnt = 0;
+
+ blobmsg_for_each_attr(cur, tb[OCI_PROCESS_USER_ADDITIONALGIDS], rem) {
+ ++gidcnt;
+ if (has_gid && (blobmsg_get_u32(cur) == opts.gr_gid))
+ continue;
+ }
+
+ if (gidcnt) {
+ opts.additional_gids = calloc(gidcnt + has_gid, sizeof(gid_t));
+ gidcnt = 0;
+
+ /* always add primary GID to set of GIDs if set */
+ if (has_gid)
+ opts.additional_gids[gidcnt++] = opts.gr_gid;
+
+ blobmsg_for_each_attr(cur, tb[OCI_PROCESS_USER_ADDITIONALGIDS], rem) {
+ if (has_gid && (blobmsg_get_u32(cur) == opts.gr_gid))
+ continue;
+ opts.additional_gids[gidcnt++] = blobmsg_get_u32(cur);
+ }
+ opts.num_additional_gids = gidcnt;
+ }
+ DEBUG("read %zu additional groups\n", gidcnt);
+ }
+
+ if (tb[OCI_PROCESS_USER_UMASK]) {
+ opts.umask = blobmsg_get_u32(tb[OCI_PROCESS_USER_UMASK]);
+ opts.set_umask = true;
+ }
+
+ return 0;
+}
+
+enum {
+ OCI_PROCESS_RLIMIT_TYPE,
+ OCI_PROCESS_RLIMIT_SOFT,
+ OCI_PROCESS_RLIMIT_HARD,
+ __OCI_PROCESS_RLIMIT_MAX,
+};
+
+static const struct blobmsg_policy oci_process_rlimit_policy[] = {
+ [OCI_PROCESS_RLIMIT_TYPE] = { "type", BLOBMSG_TYPE_STRING },
+ [OCI_PROCESS_RLIMIT_SOFT] = { "soft", BLOBMSG_CAST_INT64 },
+ [OCI_PROCESS_RLIMIT_HARD] = { "hard", BLOBMSG_CAST_INT64 },
+};
+
+/* from manpage GETRLIMIT(2) */
+static const char* const rlimit_names[RLIM_NLIMITS] = {
+ [RLIMIT_AS] = "AS",
+ [RLIMIT_CORE] = "CORE",
+ [RLIMIT_CPU] = "CPU",
+ [RLIMIT_DATA] = "DATA",
+ [RLIMIT_FSIZE] = "FSIZE",
+ [RLIMIT_LOCKS] = "LOCKS",
+ [RLIMIT_MEMLOCK] = "MEMLOCK",
+ [RLIMIT_MSGQUEUE] = "MSGQUEUE",
+ [RLIMIT_NICE] = "NICE",
+ [RLIMIT_NOFILE] = "NOFILE",
+ [RLIMIT_NPROC] = "NPROC",
+ [RLIMIT_RSS] = "RSS",
+ [RLIMIT_RTPRIO] = "RTPRIO",
+ [RLIMIT_RTTIME] = "RTTIME",
+ [RLIMIT_SIGPENDING] = "SIGPENDING",
+ [RLIMIT_STACK] = "STACK",
+};
+
+static int resolve_rlimit(char *type) {
+ unsigned int rltype;
+
+ for (rltype = 0; rltype < RLIM_NLIMITS; ++rltype)
+ if (rlimit_names[rltype] &&
+ !strncmp("RLIMIT_", type, 7) &&
+ !strcmp(rlimit_names[rltype], type + 7))
+ return rltype;
+
+ return -1;
+}
+
+
+static int parseOCIrlimit(struct blob_attr *msg)
+{
+ struct blob_attr *tb[__OCI_PROCESS_RLIMIT_MAX];
+ int limtype = -1;
+ struct rlimit *curlim;
+
+ blobmsg_parse(oci_process_rlimit_policy, __OCI_PROCESS_RLIMIT_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
+
+ if (!tb[OCI_PROCESS_RLIMIT_TYPE] ||
+ !tb[OCI_PROCESS_RLIMIT_SOFT] ||
+ !tb[OCI_PROCESS_RLIMIT_HARD])
+ return ENODATA;
+
+ limtype = resolve_rlimit(blobmsg_get_string(tb[OCI_PROCESS_RLIMIT_TYPE]));
+
+ if (limtype < 0)
+ return EINVAL;
+
+ if (opts.rlimits[limtype])
+ return ENOTUNIQ;
+
+ curlim = malloc(sizeof(struct rlimit));
+ curlim->rlim_cur = blobmsg_cast_u64(tb[OCI_PROCESS_RLIMIT_SOFT]);
+ curlim->rlim_max = blobmsg_cast_u64(tb[OCI_PROCESS_RLIMIT_HARD]);
+
+ opts.rlimits[limtype] = curlim;
+
+ return 0;
+};
+
+enum {
+ OCI_PROCESS_ARGS,
+ OCI_PROCESS_CAPABILITIES,
+ OCI_PROCESS_CWD,
+ OCI_PROCESS_ENV,
+ OCI_PROCESS_OOMSCOREADJ,
+ OCI_PROCESS_NONEWPRIVILEGES,
+ OCI_PROCESS_RLIMITS,
+ OCI_PROCESS_TERMINAL,
+ OCI_PROCESS_USER,
+ __OCI_PROCESS_MAX,
+};
+
+static const struct blobmsg_policy oci_process_policy[] = {
+ [OCI_PROCESS_ARGS] = { "args", BLOBMSG_TYPE_ARRAY },
+ [OCI_PROCESS_CAPABILITIES] = { "capabilities", BLOBMSG_TYPE_TABLE },
+ [OCI_PROCESS_CWD] = { "cwd", BLOBMSG_TYPE_STRING },
+ [OCI_PROCESS_ENV] = { "env", BLOBMSG_TYPE_ARRAY },
+ [OCI_PROCESS_OOMSCOREADJ] = { "oomScoreAdj", BLOBMSG_TYPE_INT32 },
+ [OCI_PROCESS_NONEWPRIVILEGES] = { "noNewPrivileges", BLOBMSG_TYPE_BOOL },
+ [OCI_PROCESS_RLIMITS] = { "rlimits", BLOBMSG_TYPE_ARRAY },
+ [OCI_PROCESS_TERMINAL] = { "terminal", BLOBMSG_TYPE_BOOL },
+ [OCI_PROCESS_USER] = { "user", BLOBMSG_TYPE_TABLE },
+};
+
+
+static int parseOCIprocess(struct blob_attr *msg)
+{
+ struct blob_attr *tb[__OCI_PROCESS_MAX], *cur;
+ int rem, res;
+
+ blobmsg_parse(oci_process_policy, __OCI_PROCESS_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
+
+ if (!tb[OCI_PROCESS_ARGS])
+ return ENOENT;
+
+ res = parseOCIenvarray(tb[OCI_PROCESS_ARGS], &opts.jail_argv);
+ if (res)
+ return res;
+
+ if (tb[OCI_PROCESS_TERMINAL])
+ opts.console = blobmsg_get_bool(tb[OCI_PROCESS_TERMINAL]);
+
+ if (tb[OCI_PROCESS_NONEWPRIVILEGES])
+ opts.no_new_privs = blobmsg_get_bool(tb[OCI_PROCESS_NONEWPRIVILEGES]);
+
+ if (tb[OCI_PROCESS_CWD])
+ opts.cwd = strdup(blobmsg_get_string(tb[OCI_PROCESS_CWD]));
+
+ if (tb[OCI_PROCESS_ENV]) {
+ res = parseOCIenvarray(tb[OCI_PROCESS_ENV], &opts.envp);
+ if (res)
+ return res;
+ }
+
+ if (tb[OCI_PROCESS_USER] && (res = parseOCIprocessuser(tb[OCI_PROCESS_USER])))
+ return res;
+
+ if (tb[OCI_PROCESS_CAPABILITIES] &&
+ (res = parseOCIcapabilities(&opts.capset, tb[OCI_PROCESS_CAPABILITIES])))
+ return res;
+
+ if (tb[OCI_PROCESS_RLIMITS]) {
+ blobmsg_for_each_attr(cur, tb[OCI_PROCESS_RLIMITS], rem) {
+ res = parseOCIrlimit(cur);
+ if (res)
+ return res;
+ }
+ }
+
+ if (tb[OCI_PROCESS_OOMSCOREADJ]) {
+ opts.oom_score_adj = blobmsg_get_u32(tb[OCI_PROCESS_OOMSCOREADJ]);
+ opts.set_oom_score_adj = true;
+ }
+
+ return 0;
+}
+
+enum {
+ OCI_LINUX_NAMESPACE_TYPE,
+ OCI_LINUX_NAMESPACE_PATH,
+ __OCI_LINUX_NAMESPACE_MAX,
+};
+
+static const struct blobmsg_policy oci_linux_namespace_policy[] = {
+ [OCI_LINUX_NAMESPACE_TYPE] = { "type", BLOBMSG_TYPE_STRING },
+ [OCI_LINUX_NAMESPACE_PATH] = { "path", BLOBMSG_TYPE_STRING },
+};
+
+static int resolve_nstype(char *type) {
+ if (!strcmp("pid", type))
+ return CLONE_NEWPID;
+ else if (!strcmp("network", type))
+ return CLONE_NEWNET;
+ else if (!strcmp("mount", type))
+ return CLONE_NEWNS;
+ else if (!strcmp("ipc", type))
+ return CLONE_NEWIPC;
+ else if (!strcmp("uts", type))
+ return CLONE_NEWUTS;
+ else if (!strcmp("user", type))
+ return CLONE_NEWUSER;
+ else if (!strcmp("cgroup", type))
+ return CLONE_NEWCGROUP;
+#ifdef CLONE_NEWTIME
+ else if (!strcmp("time", type))
+ return CLONE_NEWTIME;
+#endif
+ else
+ return 0;
+}
+
+static int parseOCIlinuxns(struct blob_attr *msg)
+{
+ struct blob_attr *tb[__OCI_LINUX_NAMESPACE_MAX];
+ int nstype;
+ int *setns;
+ int fd;
+
+ blobmsg_parse(oci_linux_namespace_policy, __OCI_LINUX_NAMESPACE_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
+
+ if (!tb[OCI_LINUX_NAMESPACE_TYPE])
+ return EINVAL;
+
+ nstype = resolve_nstype(blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_TYPE]));
+ if (!nstype)
+ return EINVAL;
+
+ if (opts.namespace & nstype)
+ return ENOTUNIQ;
+
+ setns = get_namespace_fd(nstype);
+
+ if (!setns)
+ return EFAULT;
+
+ if (*setns != -1)
+ return ENOTUNIQ;
+
+ if (tb[OCI_LINUX_NAMESPACE_PATH]) {
+ DEBUG("opening existing %s namespace from path %s\n",
+ blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_TYPE]),
+ blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_PATH]));
+
+ fd = open(blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_PATH]), O_RDONLY);
+ if (fd == -1)
+ return errno?:ESTALE;
+
+ if (ioctl(fd, NS_GET_NSTYPE) != nstype)
+ return EINVAL;
+
+ DEBUG("opened existing %s namespace got filehandler %u\n",
+ blobmsg_get_string(tb[OCI_LINUX_NAMESPACE_TYPE]),
+ fd);
+
+ *setns = fd;
+ } else {
+ opts.namespace |= nstype;
+ }
+
+ return 0;
+}
+
+static void get_jail_root_user(bool is_gidmap, uint32_t container_id, uint32_t host_id, uint32_t size)
+{
+ if (container_id == 0 && size >= 1)
+ if (!is_gidmap)
+ opts.root_map_uid = host_id;
+}
+
+enum {
+ OCI_LINUX_UIDGIDMAP_CONTAINERID,
+ OCI_LINUX_UIDGIDMAP_HOSTID,
+ OCI_LINUX_UIDGIDMAP_SIZE,
+ __OCI_LINUX_UIDGIDMAP_MAX,
+};
+
+static const struct blobmsg_policy oci_linux_uidgidmap_policy[] = {
+ [OCI_LINUX_UIDGIDMAP_CONTAINERID] = { "containerID", BLOBMSG_TYPE_INT32 },
+ [OCI_LINUX_UIDGIDMAP_HOSTID] = { "hostID", BLOBMSG_TYPE_INT32 },
+ [OCI_LINUX_UIDGIDMAP_SIZE] = { "size", BLOBMSG_TYPE_INT32 },
+};
+
+static int parseOCIuidgidmappings(struct blob_attr *msg, bool is_gidmap)
+{
+ struct blob_attr *tb[__OCI_LINUX_UIDGIDMAP_MAX];
+ struct blob_attr *cur;
+ int rem;
+ char *map;
+ size_t len, pos, totallen = 0;
+
+ blobmsg_for_each_attr(cur, msg, rem) {
+ blobmsg_parse(oci_linux_uidgidmap_policy, __OCI_LINUX_UIDGIDMAP_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
+
+ if (!tb[OCI_LINUX_UIDGIDMAP_CONTAINERID] ||
+ !tb[OCI_LINUX_UIDGIDMAP_HOSTID] ||
+ !tb[OCI_LINUX_UIDGIDMAP_SIZE])
+ return EINVAL;
+
+ /* count length */
+ totallen += snprintf(NULL, 0, "%d %d %d\n",
+ blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_CONTAINERID]),
+ blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_HOSTID]),
+ blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_SIZE]));
+ }
+
+ /* allocate combined mapping string */
+ map = malloc(totallen + 1);
+ if (!map)
+ return ENOMEM;
+
+ pos = 0;
+ blobmsg_for_each_attr(cur, msg, rem) {
+ blobmsg_parse(oci_linux_uidgidmap_policy, __OCI_LINUX_UIDGIDMAP_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
+
+ get_jail_root_user(is_gidmap, blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_CONTAINERID]),
+ blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_HOSTID]),
+ blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_SIZE]));
+
+ /* write mapping line into pre-allocated string */
+ len = snprintf(&map[pos], totallen + 1, "%d %d %d\n",
+ blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_CONTAINERID]),
+ blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_HOSTID]),
+ blobmsg_get_u32(tb[OCI_LINUX_UIDGIDMAP_SIZE]));
+ pos += len;
+ totallen -= len;
+ }
+
+ assert(totallen == 0);
+
+ if (is_gidmap)
+ opts.gidmap = map;
+ else
+ opts.uidmap = map;
+
+ return 0;
+}
+
+enum {
+ OCI_DEVICES_TYPE,
+ OCI_DEVICES_PATH,
+ OCI_DEVICES_MAJOR,
+ OCI_DEVICES_MINOR,
+ OCI_DEVICES_FILEMODE,
+ OCI_DEVICES_UID,
+ OCI_DEVICES_GID,
+ __OCI_DEVICES_MAX,
+};
+
+static const struct blobmsg_policy oci_devices_policy[] = {
+ [OCI_DEVICES_TYPE] = { "type", BLOBMSG_TYPE_STRING },
+ [OCI_DEVICES_PATH] = { "path", BLOBMSG_TYPE_STRING },
+ [OCI_DEVICES_MAJOR] = { "major", BLOBMSG_TYPE_INT32 },
+ [OCI_DEVICES_MINOR] = { "minor", BLOBMSG_TYPE_INT32 },
+ [OCI_DEVICES_FILEMODE] = { "fileMode", BLOBMSG_TYPE_INT32 },
+ [OCI_DEVICES_UID] = { "uid", BLOBMSG_TYPE_INT32 },
+ [OCI_DEVICES_GID] = { "uid", BLOBMSG_TYPE_INT32 },
+};
+
+static mode_t resolve_devtype(char *tstr)
+{
+ if (!strcmp("c", tstr) ||
+ !strcmp("u", tstr))
+ return S_IFCHR;
+ else if (!strcmp("b", tstr))
+ return S_IFBLK;
+ else if (!strcmp("p", tstr))
+ return S_IFIFO;
+ else
+ return 0;
+}
+
+static int parseOCIdevices(struct blob_attr *msg)
+{
+ struct blob_attr *tb[__OCI_DEVICES_MAX];
+ struct blob_attr *cur;
+ int rem;
+ size_t cnt = 0;
+ struct mknod_args *tmp;
+
+ blobmsg_for_each_attr(cur, msg, rem)
+ ++cnt;
+
+ opts.devices = calloc(cnt + 1, sizeof(struct mknod_args *));
+
+ cnt = 0;
+ blobmsg_for_each_attr(cur, msg, rem) {
+ blobmsg_parse(oci_devices_policy, __OCI_DEVICES_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
+ if (!tb[OCI_DEVICES_TYPE] ||
+ !tb[OCI_DEVICES_PATH])
+ return ENODATA;
+
+ tmp = calloc(1, sizeof(struct mknod_args));
+ if (!tmp)
+ return ENOMEM;
+
+ tmp->mode = resolve_devtype(blobmsg_get_string(tb[OCI_DEVICES_TYPE]));
+ if (!tmp->mode)
+ return EINVAL;
+
+ if (tmp->mode != S_IFIFO) {
+ if (!tb[OCI_DEVICES_MAJOR] || !tb[OCI_DEVICES_MINOR])
+ return ENODATA;
+
+ tmp->dev = makedev(blobmsg_get_u32(tb[OCI_DEVICES_MAJOR]),
+ blobmsg_get_u32(tb[OCI_DEVICES_MINOR]));
+ }
+
+ if (tb[OCI_DEVICES_FILEMODE]) {
+ if (~(S_IRWXU|S_IRWXG|S_IRWXO) & blobmsg_get_u32(tb[OCI_DEVICES_FILEMODE]))
+ return EINVAL;
+
+ tmp->mode |= blobmsg_get_u32(tb[OCI_DEVICES_FILEMODE]);
+ } else {
+ tmp->mode |= (S_IRUSR|S_IWUSR); /* 0600 */
+ }
+
+ tmp->path = strdup(blobmsg_get_string(tb[OCI_DEVICES_PATH]));
+
+ if (tb[OCI_DEVICES_UID])
+ tmp->uid = blobmsg_get_u32(tb[OCI_DEVICES_UID]);
+ else
+ tmp->uid = -1;
+
+ if (tb[OCI_DEVICES_GID])
+ tmp->gid = blobmsg_get_u32(tb[OCI_DEVICES_GID]);
+ else
+ tmp->gid = -1;
+
+ DEBUG("read device %s (%s)\n", blobmsg_get_string(tb[OCI_DEVICES_PATH]), blobmsg_get_string(tb[OCI_DEVICES_TYPE]));
+ opts.devices[cnt++] = tmp;
+ }
+
+ opts.devices[cnt] = NULL;
+
+ return 0;
+}
+
+static int parseOCIsysctl(struct blob_attr *msg)
+{
+ struct blob_attr *cur;
+ int rem;
+ char *tmp, *tc;
+ size_t cnt = 0;
+
+ blobmsg_for_each_attr(cur, msg, rem) {
+ if (!blobmsg_name(cur) || !blobmsg_get_string(cur))
+ return EINVAL;
+
+ ++cnt;
+ }
+
+ if (!cnt)
+ return 0;
+
+ opts.sysctl = calloc(cnt + 1, sizeof(struct sysctl_val *));
+ if (!opts.sysctl)
+ return ENOMEM;
+
+ cnt = 0;
+ blobmsg_for_each_attr(cur, msg, rem) {
+ opts.sysctl[cnt] = malloc(sizeof(struct sysctl_val));
+ if (!opts.sysctl[cnt])
+ return ENOMEM;
+
+ /* replace '.' with '/' in entry name */
+ tc = tmp = strdup(blobmsg_name(cur));
+ while ((tc = strchr(tc, '.')))
+ *tc = '/';
+
+ opts.sysctl[cnt]->value = strdup(blobmsg_get_string(cur));
+ opts.sysctl[cnt]->entry = tmp;
+
+ ++cnt;
+ }
+
+ opts.sysctl[cnt] = NULL;
+
+ return 0;
+}
+
+
+enum {
+ OCI_LINUX_CGROUPSPATH,
+ OCI_LINUX_RESOURCES,
+ OCI_LINUX_SECCOMP,
+ OCI_LINUX_SYSCTL,
+ OCI_LINUX_NAMESPACES,
+ OCI_LINUX_DEVICES,
+ OCI_LINUX_UIDMAPPINGS,
+ OCI_LINUX_GIDMAPPINGS,
+ OCI_LINUX_MASKEDPATHS,
+ OCI_LINUX_READONLYPATHS,
+ OCI_LINUX_ROOTFSPROPAGATION,
+ __OCI_LINUX_MAX,
+};
+
+static const struct blobmsg_policy oci_linux_policy[] = {
+ [OCI_LINUX_CGROUPSPATH] = { "cgroupsPath", BLOBMSG_TYPE_STRING },
+ [OCI_LINUX_RESOURCES] = { "resources", BLOBMSG_TYPE_TABLE },
+ [OCI_LINUX_SECCOMP] = { "seccomp", BLOBMSG_TYPE_TABLE },
+ [OCI_LINUX_SYSCTL] = { "sysctl", BLOBMSG_TYPE_TABLE },
+ [OCI_LINUX_NAMESPACES] = { "namespaces", BLOBMSG_TYPE_ARRAY },
+ [OCI_LINUX_DEVICES] = { "devices", BLOBMSG_TYPE_ARRAY },
+ [OCI_LINUX_UIDMAPPINGS] = { "uidMappings", BLOBMSG_TYPE_ARRAY },
+ [OCI_LINUX_GIDMAPPINGS] = { "gidMappings", BLOBMSG_TYPE_ARRAY },
+ [OCI_LINUX_MASKEDPATHS] = { "maskedPaths", BLOBMSG_TYPE_ARRAY },
+ [OCI_LINUX_READONLYPATHS] = { "readonlyPaths", BLOBMSG_TYPE_ARRAY },
+ [OCI_LINUX_ROOTFSPROPAGATION] = { "rootfsPropagation", BLOBMSG_TYPE_STRING },
+};
+
+static int parseOCIlinux(struct blob_attr *msg)
+{
+ struct blob_attr *tb[__OCI_LINUX_MAX];
+ struct blob_attr *cur;
+ int rem;
+ int res = 0;
+ char *cgpath;
+ char cgfullpath[256] = "/sys/fs/cgroup";
+
+ blobmsg_parse(oci_linux_policy, __OCI_LINUX_MAX, tb, blobmsg_data(msg), blobmsg_len(msg));
+
+ if (tb[OCI_LINUX_NAMESPACES]) {
+ blobmsg_for_each_attr(cur, tb[OCI_LINUX_NAMESPACES], rem) {
+ res = parseOCIlinuxns(cur);
+ if (res)
+ return res;
+ }
+ }
+
+ if (tb[OCI_LINUX_UIDMAPPINGS]) {
+ res = parseOCIuidgidmappings(tb[OCI_LINUX_GIDMAPPINGS], 0);
+ if (res)
+ return res;
+ }
+
+ if (tb[OCI_LINUX_GIDMAPPINGS]) {
+ res = parseOCIuidgidmappings(tb[OCI_LINUX_GIDMAPPINGS], 1);
+ if (res)
+ return res;
+ }
+
+ if (tb[OCI_LINUX_READONLYPATHS]) {
+ blobmsg_for_each_attr(cur, tb[OCI_LINUX_READONLYPATHS], rem) {
+ res = add_mount(NULL, blobmsg_get_string(cur), NULL, MS_BIND | MS_REC | MS_RDONLY, 0, NULL, 0);
+ if (res)
+ return res;
+ }
+ }
+
+ if (tb[OCI_LINUX_MASKEDPATHS]) {
+ blobmsg_for_each_attr(cur, tb[OCI_LINUX_MASKEDPATHS], rem) {
+ res = add_mount((void *)(-1), blobmsg_get_string(cur), NULL, 0, 0, NULL, 0);
+ if (res)
+ return res;
+ }
+ }
+
+ if (tb[OCI_LINUX_SYSCTL]) {
+ res = parseOCIsysctl(tb[OCI_LINUX_SYSCTL]);
+ if (res)
+ return res;
+ }
+
+ if (tb[OCI_LINUX_SECCOMP]) {
+ opts.ociseccomp = parseOCIlinuxseccomp(tb[OCI_LINUX_SECCOMP]);
+ if (!opts.ociseccomp)
+ return EINVAL;
+ }
+
+ if (tb[OCI_LINUX_DEVICES]) {
+ res = parseOCIdevices(tb[OCI_LINUX_DEVICES]);
+ if (res)
+ return res;
}
- if (readonly && mount(NULL, new, NULL, MS_BIND | MS_REMOUNT | MS_RDONLY, NULL)) {
- ERROR("failed to remount ro %s: %s\n", new, strerror(errno));
- return -1;
+ if (tb[OCI_LINUX_CGROUPSPATH]) {
+ cgpath = blobmsg_get_string(tb[OCI_LINUX_CGROUPSPATH]);
+ if (cgpath[0] == '/') {
+ if (strlen(cgpath) >= (sizeof(cgfullpath) - strlen(cgfullpath)))
+ return E2BIG;
+
+ strcat(cgfullpath, cgpath);
+ } else {
+ strcat(cgfullpath, "/containers/");
+ strcat(cgfullpath, opts.name); /* should be container name rather than jail name */
+ strcat(cgfullpath, "/");
+ if (strlen(cgpath) >= (sizeof(cgfullpath) - strlen(cgfullpath)))
+ return E2BIG;
+
+ strcat(cgfullpath, cgpath);
+ }
+ } else {
+ strcat(cgfullpath, "/containers/");
+ strcat(cgfullpath, opts.name); /* should be container name rather than jail name */
+ strcat(cgfullpath, "/");
+ strcat(cgfullpath, opts.name); /* should be container instance name rather than jail name */
}
- DEBUG("mount -B %s %s\n", path, new);
+ cgroups_init(cgfullpath);
+
+ if (tb[OCI_LINUX_RESOURCES]) {
+ res = parseOCIlinuxcgroups(tb[OCI_LINUX_RESOURCES]);
+ if (res)
+ return res;
+ }
return 0;
}
-static int build_jail_fs(void)
+enum {
+ OCI_VERSION,
+ OCI_HOSTNAME,
+ OCI_PROCESS,
+ OCI_ROOT,
+ OCI_MOUNTS,
+ OCI_HOOKS,
+ OCI_LINUX,
+ OCI_ANNOTATIONS,
+ __OCI_MAX,
+};
+
+static const struct blobmsg_policy oci_policy[] = {
+ [OCI_VERSION] = { "ociVersion", BLOBMSG_TYPE_STRING },
+ [OCI_HOSTNAME] = { "hostname", BLOBMSG_TYPE_STRING },
+ [OCI_PROCESS] = { "process", BLOBMSG_TYPE_TABLE },
+ [OCI_ROOT] = { "root", BLOBMSG_TYPE_TABLE },
+ [OCI_MOUNTS] = { "mounts", BLOBMSG_TYPE_ARRAY },
+ [OCI_HOOKS] = { "hooks", BLOBMSG_TYPE_TABLE },
+ [OCI_LINUX] = { "linux", BLOBMSG_TYPE_TABLE },
+ [OCI_ANNOTATIONS] = { "annotations", BLOBMSG_TYPE_TABLE },
+};
+
+static int parseOCI(const char *jsonfile)
{
- char jail_root[] = "/tmp/ujail-XXXXXX";
- if (mkdtemp(jail_root) == NULL) {
- ERROR("mkdtemp(jail_root) failed: %s\n", strerror(errno));
- return -1;
- }
+ struct blob_attr *tb[__OCI_MAX];
+ struct blob_attr *cur;
+ int rem;
+ int res;
- if (mount("tmpfs", jail_root, "tmpfs", MS_NOATIME, "mode=0755")) {
- ERROR("tmpfs mount failed %s\n", strerror(errno));
- return -1;
+ blob_buf_init(&ocibuf, 0);
+
+ if (!blobmsg_add_json_from_file(&ocibuf, jsonfile)) {
+ res=ENOENT;
+ goto errout;
}
- if (chdir(jail_root)) {
- ERROR("failed to chdir() in the jail root\n");
- return -1;
+ blobmsg_parse(oci_policy, __OCI_MAX, tb, blob_data(ocibuf.head), blob_len(ocibuf.head));
+
+ if (!tb[OCI_VERSION]) {
+ res=ENOMSG;
+ goto errout;
}
- if (mount_all(jail_root)) {
- ERROR("mount_all() failed\n");
- return -1;
+ if (strncmp("1.0", blobmsg_get_string(tb[OCI_VERSION]), 3)) {
+ ERROR("unsupported ociVersion %s\n", blobmsg_get_string(tb[OCI_VERSION]));
+ res=ENOTSUP;
+ goto errout;
}
- char dirbuf[sizeof(jail_root) + 4];
- snprintf(dirbuf, sizeof(dirbuf), "%s/old", jail_root);
- mkdir(dirbuf, 0755);
+ if (tb[OCI_HOSTNAME])
+ opts.hostname = strdup(blobmsg_get_string(tb[OCI_HOSTNAME]));
- if (pivot_root(jail_root, dirbuf) == -1) {
- ERROR("pivot_root failed: %s\n", strerror(errno));
- return -1;
- }
- if (chdir("/")) {
- ERROR("chdir(/) failed: %s\n", strerror(errno));
- return -1;
+ if (!tb[OCI_PROCESS]) {
+ res=ENODATA;
+ goto errout;
}
- snprintf(dirbuf, sizeof(dirbuf), "/old%s", jail_root);
- rmdir(dirbuf);
- umount2("/old", MNT_DETACH);
- rmdir("/old");
+ if ((res = parseOCIprocess(tb[OCI_PROCESS])))
+ goto errout;
- if (opts.procfs) {
- mkdir("/proc", 0755);
- mount("proc", "/proc", "proc", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0);
+ if (!tb[OCI_ROOT]) {
+ res=ENODATA;
+ goto errout;
}
- if (opts.sysfs) {
- mkdir("/sys", 0755);
- mount("sysfs", "/sys", "sysfs", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0);
+ if ((res = parseOCIroot(jsonfile, tb[OCI_ROOT])))
+ goto errout;
+
+ if (!tb[OCI_MOUNTS]) {
+ res=ENODATA;
+ goto errout;
}
- if (opts.ronly)
- mount(NULL, "/", NULL, MS_RDONLY | MS_REMOUNT, 0);
- return 0;
+ blobmsg_for_each_attr(cur, tb[OCI_MOUNTS], rem)
+ if ((res = parseOCImount(cur)))
+ goto errout;
+
+ if (tb[OCI_LINUX] && (res = parseOCIlinux(tb[OCI_LINUX])))
+ goto errout;
+
+ if (tb[OCI_HOOKS] && (res = parseOCIhooks(tb[OCI_HOOKS])))
+ goto errout;
+
+ if (tb[OCI_ANNOTATIONS])
+ opts.annotations = blob_memdup(tb[OCI_ANNOTATIONS]);
+
+errout:
+ blob_buf_free(&ocibuf);
+
+ return res;
}
-#define MAX_ENVP 8
-static char** build_envp(const char *seccomp)
+static int set_oom_score_adj(void)
{
- static char *envp[MAX_ENVP];
- static char preload_var[PATH_MAX];
- static char seccomp_var[PATH_MAX];
- static char debug_var[] = "LD_DEBUG=all";
- const char *preload_lib = find_lib("libpreload-seccomp.so");
- int count = 0;
+ int f;
+ char fname[32];
- if (seccomp && !preload_lib) {
- ERROR("failed to add preload-lib to env\n");
- return NULL;
- }
- if (seccomp) {
- snprintf(seccomp_var, sizeof(seccomp_var), "SECCOMP_FILE=%s", seccomp);
- envp[count++] = seccomp_var;
- snprintf(preload_var, sizeof(preload_var), "LD_PRELOAD=%s", preload_lib);
- envp[count++] = preload_var;
- }
- if (debug > 1)
- envp[count++] = debug_var;
+ if (!opts.set_oom_score_adj)
+ return 0;
- return envp;
+ snprintf(fname, sizeof(fname), "/proc/%u/oom_score_adj", jail_process.pid);
+ f = open(fname, O_WRONLY | O_TRUNC);
+ if (f == -1)
+ return errno;
+
+ dprintf(f, "%d", opts.oom_score_adj);
+ close(f);
+
+ return 0;
}
-static void usage(void)
+
+enum {
+ OCI_STATE_CREATING,
+ OCI_STATE_CREATED,
+ OCI_STATE_RUNNING,
+ OCI_STATE_STOPPED,
+};
+
+static int jail_oci_state = OCI_STATE_CREATED;
+static void pipe_send_start_container(struct uloop_timeout *t);
+static struct uloop_timeout start_container_timeout = {
+ .cb = pipe_send_start_container,
+};
+
+static int handle_start(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
{
- fprintf(stderr, "ujail <options> -- <binary> <params ...>\n");
- fprintf(stderr, " -d <num>\tshow debug log (increase num to increase verbosity)\n");
- fprintf(stderr, " -S <file>\tseccomp filter config\n");
- fprintf(stderr, " -C <file>\tcapabilities drop config\n");
- fprintf(stderr, " -c\t\tset PR_SET_NO_NEW_PRIVS\n");
- fprintf(stderr, " -n <name>\tthe name of the jail\n");
- fprintf(stderr, "namespace jail options:\n");
- fprintf(stderr, " -h <hostname>\tchange the hostname of the jail\n");
- fprintf(stderr, " -r <file>\treadonly files that should be staged\n");
- fprintf(stderr, " -w <file>\twriteable files that should be staged\n");
- fprintf(stderr, " -p\t\tjail has /proc\n");
- fprintf(stderr, " -s\t\tjail has /sys\n");
- fprintf(stderr, " -l\t\tjail has /dev/log\n");
- fprintf(stderr, " -u\t\tjail has a ubus socket\n");
- fprintf(stderr, " -o\t\tremont jail root (/) read only\n");
- fprintf(stderr, "\nWarning: by default root inside the jail is the same\n\
-and he has the same powers as root outside the jail,\n\
-thus he can escape the jail and/or break stuff.\n\
-Please use seccomp/capabilities (-S/-C) to restrict his powers\n\n\
-If you use none of the namespace jail options,\n\
-ujail will not use namespace/build a jail,\n\
-and will only drop capabilities/apply seccomp filter.\n\n");
+ if (jail_oci_state != OCI_STATE_CREATED)
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ uloop_timeout_add(&start_container_timeout);
+
+ return UBUS_STATUS_OK;
}
-static int exec_jail(void)
+static struct blob_buf bb;
+static int handle_state(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
{
- char **envp = build_envp(opts.seccomp);
- if (!envp)
- exit(EXIT_FAILURE);
+ char *statusstr;
- if (opts.capabilities && drop_capabilities(opts.capabilities))
- exit(EXIT_FAILURE);
-
- if (opts.no_new_privs && prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
- ERROR("prctl(PR_SET_NO_NEW_PRIVS) failed: %s\n", strerror(errno));
- exit(EXIT_FAILURE);
+ switch (jail_oci_state) {
+ case OCI_STATE_CREATING:
+ statusstr = "creating";
+ break;
+ case OCI_STATE_CREATED:
+ statusstr = "created";
+ break;
+ case OCI_STATE_RUNNING:
+ statusstr = "running";
+ break;
+ case OCI_STATE_STOPPED:
+ statusstr = "stopped";
+ break;
+ default:
+ statusstr = "unknown";
}
- INFO("exec-ing %s\n", *opts.jail_argv);
- execve(*opts.jail_argv, opts.jail_argv, envp);
- /* we get there only if execve fails */
- ERROR("failed to execve %s: %s\n", *opts.jail_argv, strerror(errno));
- exit(EXIT_FAILURE);
+ blob_buf_init(&bb, 0);
+ blobmsg_add_string(&bb, "ociVersion", OCI_VERSION_STRING);
+ blobmsg_add_string(&bb, "id", opts.name);
+ blobmsg_add_string(&bb, "status", statusstr);
+ if (jail_oci_state == OCI_STATE_CREATED ||
+ jail_oci_state == OCI_STATE_RUNNING)
+ blobmsg_add_u32(&bb, "pid", jail_process.pid);
+
+ blobmsg_add_string(&bb, "bundle", opts.ocibundle);
+
+ if (opts.annotations)
+ blobmsg_add_blob(&bb, opts.annotations);
+
+ ubus_send_reply(ctx, req, bb.head);
+
+ return UBUS_STATUS_OK;
}
-static int spawn_jail(void *_notused)
+enum {
+ CONTAINER_KILL_ATTR_SIGNAL,
+ __CONTAINER_KILL_ATTR_MAX,
+};
+
+static const struct blobmsg_policy container_kill_attrs[__CONTAINER_KILL_ATTR_MAX] = {
+ [CONTAINER_KILL_ATTR_SIGNAL] = { "signal", BLOBMSG_TYPE_INT32 },
+};
+
+static int
+container_handle_kill(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
{
- if (opts.hostname && sethostname(opts.hostname, strlen(opts.hostname))) {
- ERROR("sethostname(%s) failed: %s\n", opts.hostname, strerror(errno));
- }
+ struct blob_attr *tb[__CONTAINER_KILL_ATTR_MAX], *cur;
+ int sig = SIGTERM;
+
+ blobmsg_parse(container_kill_attrs, __CONTAINER_KILL_ATTR_MAX, tb, blobmsg_data(msg), blobmsg_data_len(msg));
+
+ cur = tb[CONTAINER_KILL_ATTR_SIGNAL];
+ if (cur)
+ sig = blobmsg_get_u32(cur);
+
+ if (jail_oci_state == OCI_STATE_CREATING)
+ return UBUS_STATUS_NOT_FOUND;
+
+ if (kill(jail_process.pid, sig) == 0)
+ return 0;
- if (build_jail_fs()) {
- ERROR("failed to build jail fs");
- exit(EXIT_FAILURE);
+ switch (errno) {
+ case EINVAL: return UBUS_STATUS_INVALID_ARGUMENT;
+ case EPERM: return UBUS_STATUS_PERMISSION_DENIED;
+ case ESRCH: return UBUS_STATUS_NOT_FOUND;
}
- return exec_jail();
+ return UBUS_STATUS_UNKNOWN_ERROR;
}
-static int jail_running = 1;
-static int jail_return_code = 0;
-
-static void jail_process_handler(struct uloop_process *c, int ret)
+static int
+jail_writepid(pid_t pid)
{
- if (WIFEXITED(ret)) {
- jail_return_code = WEXITSTATUS(ret);
- INFO("jail (%d) exited with exit: %d\n", c->pid, jail_return_code);
- } else {
- jail_return_code = WTERMSIG(ret);
- INFO("jail (%d) exited with signal: %d\n", c->pid, jail_return_code);
+ FILE *_pidfile;
+
+ if (!opts.pidfile)
+ return 0;
+
+ _pidfile = fopen(opts.pidfile, "w");
+ if (_pidfile == NULL)
+ return errno;
+
+ if (fprintf(_pidfile, "%d\n", pid) < 0) {
+ fclose(_pidfile);
+ return errno;
}
- jail_running = 0;
- uloop_end();
+
+ if (fclose(_pidfile))
+ return errno;
+
+ return 0;
}
-static struct uloop_process jail_process = {
- .cb = jail_process_handler,
+static struct ubus_method container_methods[] = {
+ UBUS_METHOD_NOARG("start", handle_start),
+ UBUS_METHOD_NOARG("state", handle_state),
+ UBUS_METHOD("kill", container_handle_kill, container_kill_attrs),
+};
+
+static struct ubus_object_type container_object_type =
+ UBUS_OBJECT_TYPE("container", container_methods);
+
+static struct ubus_object container_object = {
+ .type = &container_object_type,
+ .methods = container_methods,
+ .n_methods = ARRAY_SIZE(container_methods),
};
+static void post_main(struct uloop_timeout *t);
+static struct uloop_timeout post_main_timeout = {
+ .cb = post_main,
+};
+static int netns_fd;
+static int pidns_fd;
+#ifdef CLONE_NEWTIME
+static int timens_fd;
+#endif
+static void post_create_runtime(void);
int main(int argc, char **argv)
{
uid_t uid = getuid();
- char log[] = "/dev/log";
- char ubus[] = "/var/run/ubus.sock";
- int ch;
+ const char log[] = "/dev/log";
+ const char ubus[] = "/var/run/ubus/ubus.sock";
+ int ch, ret;
if (uid) {
- ERROR("not root, aborting: %s\n", strerror(errno));
+ ERROR("not root, aborting: %m\n");
return EXIT_FAILURE;
}
umask(022);
mount_list_init();
init_library_search();
+ cgroups_prepare();
+ exit_from_child = false;
while ((ch = getopt(argc, argv, OPT_ARGS)) != -1) {
switch (ch) {
debug = atoi(optarg);
break;
case 'p':
- opts.namespace = 1;
+ opts.namespace |= CLONE_NEWNS;
opts.procfs = 1;
break;
case 'o':
- opts.namespace = 1;
+ opts.namespace |= CLONE_NEWNS;
opts.ronly = 1;
break;
+ case 'f':
+ opts.namespace |= CLONE_NEWUSER;
+ break;
+ case 'F':
+ opts.namespace |= CLONE_NEWCGROUP;
+ break;
+ case 'R':
+ opts.extroot = optarg;
+ break;
case 's':
- opts.namespace = 1;
+ opts.namespace |= CLONE_NEWNS;
opts.sysfs = 1;
break;
case 'S':
opts.seccomp = optarg;
- add_mount(optarg, 1, -1);
+ add_mount_bind(optarg, 1, -1);
break;
case 'C':
opts.capabilities = optarg;
- add_mount(optarg, 1, -1);
break;
case 'c':
opts.no_new_privs = 1;
case 'n':
opts.name = optarg;
break;
+ case 'N':
+ opts.namespace |= CLONE_NEWNET;
+ break;
case 'h':
- opts.hostname = optarg;
+ opts.namespace |= CLONE_NEWUTS;
+ opts.hostname = strdup(optarg);
break;
case 'r':
- opts.namespace = 1;
+ opts.namespace |= CLONE_NEWNS;
add_path_and_deps(optarg, 1, 0, 0);
break;
case 'w':
- opts.namespace = 1;
+ opts.namespace |= CLONE_NEWNS;
add_path_and_deps(optarg, 0, 0, 0);
break;
case 'u':
- opts.namespace = 1;
- add_mount(ubus, 0, -1);
+ opts.namespace |= CLONE_NEWNS;
+ add_mount_bind(ubus, 0, -1);
break;
case 'l':
- opts.namespace = 1;
- add_mount(log, 0, -1);
+ opts.namespace |= CLONE_NEWNS;
+ add_mount_bind(log, 0, -1);
+ break;
+ case 'U':
+ opts.user = optarg;
+ break;
+ case 'G':
+ opts.group = optarg;
+ break;
+ case 'O':
+ opts.overlaydir = optarg;
break;
+ case 'T':
+ opts.tmpoverlaysize = optarg;
+ break;
+ case 'E':
+ opts.require_jail = 1;
+ break;
+ case 'y':
+ opts.console = 1;
+ break;
+ case 'J':
+ opts.ocibundle = optarg;
+ break;
+ case 'i':
+ opts.immediately = true;
+ break;
+ case 'P':
+ opts.pidfile = optarg;
+ break;
+ }
+ }
+
+ if (opts.namespace && !opts.ocibundle)
+ opts.namespace |= CLONE_NEWIPC | CLONE_NEWPID;
+
+ /* those are filehandlers, so -1 indicates unused */
+ opts.setns.pid = -1;
+ opts.setns.net = -1;
+ opts.setns.ns = -1;
+ opts.setns.ipc = -1;
+ opts.setns.uts = -1;
+ opts.setns.user = -1;
+ opts.setns.cgroup = -1;
+#ifdef CLONE_NEWTIME
+ opts.setns.time = -1;
+#endif
+
+ /*
+ * uid in parent user namespace representing root user in new
+ * user namespace, defaults to nobody unless specified in uidMappings
+ */
+ opts.root_map_uid = 65534;
+
+ if (opts.capabilities && parseOCIcapabilities_from_file(&opts.capset, opts.capabilities)) {
+ ERROR("failed to read capabilities from file %s\n", opts.capabilities);
+ ret=-1;
+ goto errout;
+ }
+
+ if (opts.ocibundle) {
+ char *jsonfile;
+ int ocires;
+
+ if (!opts.name) {
+ ERROR("OCI bundle needs a named jail\n");
+ ret=-1;
+ goto errout;
+ }
+ asprintf(&jsonfile, "%s/config.json", opts.ocibundle);
+ ocires = parseOCI(jsonfile);
+ free(jsonfile);
+ if (ocires) {
+ ERROR("parsing of OCI JSON spec has failed: %s (%d)\n", strerror(ocires), ocires);
+ ret=ocires;
+ goto errout;
}
}
+ if (opts.namespace & CLONE_NEWNET) {
+ if (!opts.name) {
+ ERROR("netns needs a named jail\n");
+ ret=-1;
+ goto errout;
+ }
+ }
+
+
+ if (opts.tmpoverlaysize && strlen(opts.tmpoverlaysize) > 8) {
+ ERROR("size parameter too long: \"%s\"\n", opts.tmpoverlaysize);
+ ret=-1;
+ goto errout;
+ }
+
/* no <binary> param found */
- if (argc - optind < 1) {
+ if (!opts.ocibundle && (argc - optind < 1)) {
usage();
- return EXIT_FAILURE;
+ ret=EXIT_FAILURE;
+ goto errout;
}
- if (!(opts.namespace||opts.capabilities||opts.seccomp)) {
+ if (!(opts.ocibundle||opts.namespace||opts.capabilities||opts.seccomp)) {
ERROR("Not using namespaces, capabilities or seccomp !!!\n\n");
usage();
- return EXIT_FAILURE;
+ ret=EXIT_FAILURE;
+ goto errout;
}
- DEBUG("Using namespaces(%d), capabilities(%d), seccomp(%d)\n",
+ DEBUG("Using namespaces(0x%08x), capabilities(%d), seccomp(%d)\n",
opts.namespace,
- opts.capabilities != 0,
- opts.seccomp != 0);
+ opts.capset.apply,
+ opts.seccomp != 0 || opts.ociseccomp != 0);
- opts.jail_argv = &argv[optind];
+ uloop_init();
+ signals_init();
- if (opts.namespace && add_path_and_deps(*opts.jail_argv, 1, -1, 0)) {
- ERROR("failed to load dependencies\n");
- return -1;
+ parent_ctx = ubus_connect(NULL);
+ ubus_add_uloop(parent_ctx);
+
+ if (opts.ocibundle) {
+ char *objname;
+ if (asprintf(&objname, "container.%s", opts.name) < 0) {
+ ret=-ENOMEM;
+ goto errout;
+ }
+
+ container_object.name = objname;
+ ret = ubus_add_object(parent_ctx, &container_object);
+ if (ret) {
+ ERROR("Failed to add object: %s\n", ubus_strerror(ret));
+ ret=-1;
+ goto errout;
+ }
+ }
+
+ /* deliberately not using 'else' on unrelated conditional branches */
+ if (!opts.ocibundle) {
+ /* allocate NULL-terminated array for argv */
+ opts.jail_argv = calloc(1 + argc - optind, sizeof(char**));
+ if (!opts.jail_argv) {
+ ret=EXIT_FAILURE;
+ goto errout;
+ }
+ for (size_t s = optind; s < argc; s++)
+ opts.jail_argv[s - optind] = strdup(argv[s]);
+
+ if (opts.namespace & CLONE_NEWUSER)
+ get_jail_user(&opts.pw_uid, &opts.pw_gid, &opts.gr_gid);
+ }
+
+ if (!opts.extroot) {
+ if (opts.namespace && add_path_and_deps(*opts.jail_argv, 1, -1, 0)) {
+ ERROR("failed to load dependencies\n");
+ ret=-1;
+ goto errout;
+ }
}
if (opts.namespace && opts.seccomp && add_path_and_deps("libpreload-seccomp.so", 1, -1, 1)) {
ERROR("failed to load libpreload-seccomp.so\n");
- return -1;
+ opts.seccomp = 0;
+ if (opts.require_jail) {
+ ret=-1;
+ goto errout;
+ }
+ }
+
+ uloop_timeout_add(&post_main_timeout);
+ uloop_run();
+
+errout:
+ if (opts.ocibundle)
+ cgroups_free();
+
+ free_opts(true);
+
+ return ret;
+}
+
+static void post_main(struct uloop_timeout *t)
+{
+ if (apply_rlimits()) {
+ ERROR("error applying resource limits\n");
+ free_and_exit(EXIT_FAILURE);
}
if (opts.name)
prctl(PR_SET_NAME, opts.name, NULL, NULL, NULL);
- uloop_init();
- if (opts.namespace) {
- jail_process.pid = clone(spawn_jail,
- child_stack + STACK_SIZE,
- CLONE_NEWUTS | CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | SIGCHLD, NULL);
+ if (pipe(&pipes[0]) < 0 || pipe(&pipes[2]) < 0)
+ free_and_exit(-1);
+
+ if (has_namespaces()) {
+ if (opts.namespace & CLONE_NEWNS) {
+ if (!opts.extroot && (opts.user || opts.group)) {
+ add_mount_bind("/etc/passwd", 1, -1);
+ add_mount_bind("/etc/group", 1, -1);
+ }
+
+#if defined(__GLIBC__)
+ if (!opts.extroot)
+ add_mount_bind("/etc/nsswitch.conf", 1, -1);
+#endif
+
+ if (!(opts.namespace & CLONE_NEWNET)) {
+ add_mount_bind("/etc/resolv.conf", 1, 0);
+ } else if (opts.setns.net == -1) {
+ char hostdir[PATH_MAX];
+
+ snprintf(hostdir, PATH_MAX, "/tmp/resolv.conf-%s.d", opts.name);
+ mkdir_p(hostdir, 0755);
+ add_mount(hostdir, "/dev/resolv.conf.d", NULL, MS_BIND | MS_NOEXEC | MS_NOATIME | MS_NOSUID | MS_NODEV | MS_RDONLY, 0, NULL, 0);
+ }
+
+ /* default mounts */
+ add_mount(NULL, "/dev", "tmpfs", MS_NOATIME | MS_NOEXEC | MS_NOSUID, 0, "size=1M", -1);
+ add_mount(NULL, "/dev/pts", "devpts", MS_NOATIME | MS_NOEXEC | MS_NOSUID, 0, "newinstance,ptmxmode=0666,mode=0620,gid=5", 0);
+
+ if (opts.procfs || opts.ocibundle) {
+ add_mount("proc", "/proc", "proc", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0, NULL, -1);
+
+ /*
+ * hack to make /proc/sys/net read-write while the rest of /proc/sys is read-only
+ * which cannot be expressed with OCI spec, but happends to be very useful.
+ * Only apply it if '/proc/sys' is not already listed as mount, maskedPath or
+ * readonlyPath.
+ * If not running in a new network namespace, only make /proc/sys read-only.
+ * If running in a new network namespace, temporarily stash (ie. mount-bind)
+ * /proc/sys/net into (totally unrelated, but surely existing) /proc/self/net.
+ * Then we mount-bind /proc/sys read-only and then mount-move /proc/self/net into
+ * /proc/sys/net.
+ * This works because mounts are executed in incrementing strcmp() order and
+ * /proc/self/net appears there before /proc/sys/net and hence the operation
+ * succeeds as the bind-mount of /proc/self/net is performed first and then
+ * move-mount of /proc/sys/net follows because 'e' preceeds 'y' in the ASCII
+ * table (and in the alphabet).
+ */
+ if (!add_mount(NULL, "/proc/sys", NULL, MS_BIND | MS_RDONLY, 0, NULL, -1))
+ if (opts.namespace & CLONE_NEWNET)
+ if (!add_mount_inner("/proc/self/net", "/proc/sys/net", NULL, MS_MOVE, 0, NULL, -1))
+ add_mount_inner("/proc/sys/net", "/proc/self/net", NULL, MS_BIND, 0, NULL, -1);
+
+ }
+ if (opts.sysfs || opts.ocibundle)
+ add_mount("sysfs", "/sys", "sysfs", MS_RELATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID | MS_RDONLY, 0, NULL, -1);
+
+ if (opts.ocibundle)
+ add_mount("shm", "/dev/shm", "tmpfs", MS_NOSUID | MS_NOEXEC | MS_NODEV, 0, "mode=1777", -1);
+
+ }
+
+ if (opts.setns.pid != -1) {
+ pidns_fd = ns_open_pid("pid", getpid());
+ setns_open(CLONE_NEWPID);
+ } else {
+ pidns_fd = -1;
+ }
+
+#ifdef CLONE_NEWTIME
+ if (opts.setns.time != -1) {
+ timens_fd = ns_open_pid("time", getpid());
+ setns_open(CLONE_NEWTIME);
+ } else {
+ timens_fd = -1;
+ }
+#endif
+
+ if (opts.namespace & CLONE_NEWUSER) {
+ if (prctl(PR_SET_SECUREBITS, SECBIT_NO_SETUID_FIXUP)) {
+ ERROR("prctl(PR_SET_SECUREBITS) failed: %m\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+ seteuid(opts.root_map_uid);
+ }
+
+ jail_process.pid = clone(exec_jail, child_stack + STACK_SIZE, SIGCHLD | (opts.namespace & (~CLONE_NEWCGROUP)), NULL);
} else {
jail_process.pid = fork();
}
if (jail_process.pid > 0) {
/* parent process */
+ char sig_buf[1];
+
uloop_process_add(&jail_process);
- uloop_run();
- uloop_done();
- if (jail_running) {
- DEBUG("uloop interrupted, killing jail process\n");
- kill(jail_process.pid, SIGTERM);
- waitpid(jail_process.pid, NULL, 0);
+ jail_running = 1;
+ seteuid(0);
+ prctl(PR_SET_SECUREBITS, 0);
+
+ if (pidns_fd != -1) {
+ setns(pidns_fd, CLONE_NEWPID);
+ close(pidns_fd);
+ }
+#ifdef CLONE_NEWTIME
+ if (timens_fd != -1)
+ setns(timens_fd, CLONE_NEWTIME);
+ close(timens_fd);
+ }
+#endif
+ if (opts.setns.net != -1)
+ close(opts.setns.net);
+ if (opts.setns.ns != -1)
+ close(opts.setns.ns);
+ if (opts.setns.ipc != -1)
+ close(opts.setns.ipc);
+ if (opts.setns.uts != -1)
+ close(opts.setns.uts);
+ if (opts.setns.user != -1)
+ close(opts.setns.user);
+ if (opts.setns.cgroup != -1)
+ close(opts.setns.cgroup);
+ close(pipes[1]);
+ close(pipes[2]);
+ if (read(pipes[0], sig_buf, 1) < 1) {
+ ERROR("can't read from child\n");
+ free_and_exit(-1);
+ }
+ close(pipes[0]);
+ set_oom_score_adj();
+
+ if (opts.ocibundle)
+ cgroups_apply(jail_process.pid);
+
+ if (opts.namespace & CLONE_NEWUSER) {
+ if (write_setgroups(jail_process.pid, true)) {
+ ERROR("can't write setgroups\n");
+ free_and_exit(-1);
+ }
+ if (!opts.uidmap) {
+ bool has_gr = (opts.gr_gid != -1);
+ if (opts.pw_uid != -1) {
+ write_single_uid_gid_map(jail_process.pid, 0, opts.pw_uid);
+ write_single_uid_gid_map(jail_process.pid, 1, has_gr?opts.gr_gid:opts.pw_gid);
+ } else {
+ write_single_uid_gid_map(jail_process.pid, 0, 65534);
+ write_single_uid_gid_map(jail_process.pid, 1, has_gr?opts.gr_gid:65534);
+ }
+ } else {
+ write_uid_gid_map(jail_process.pid, 0, opts.uidmap);
+ if (opts.gidmap)
+ write_uid_gid_map(jail_process.pid, 1, opts.gidmap);
+ }
+ }
+
+ if (opts.namespace & CLONE_NEWNET) {
+ netns_fd = ns_open_pid("net", jail_process.pid);
+ netns_updown(jail_process.pid, true);
+ }
+
+ if (jail_writepid(jail_process.pid)) {
+ ERROR("failed to write pidfile: %m\n");
+ free_and_exit(-1);
}
- return jail_return_code;
} else if (jail_process.pid == 0) {
/* fork child process */
- return exec_jail();
+ free_and_exit(exec_jail(NULL));
} else {
- ERROR("failed to clone/fork: %s\n", strerror(errno));
- return EXIT_FAILURE;
+ ERROR("failed to clone/fork: %m\n");
+ free_and_exit(EXIT_FAILURE);
+ }
+ run_hooks(opts.hooks.createRuntime, post_create_runtime);
+}
+
+static void post_poststart(void);
+static void post_create_runtime(void)
+{
+ char sig_buf[1];
+
+ sig_buf[0] = 'O';
+ if (write(pipes[3], sig_buf, 1) < 0) {
+ ERROR("can't write to child\n");
+ free_and_exit(-1);
+ }
+
+ jail_oci_state = OCI_STATE_CREATED;
+ if (opts.ocibundle && !opts.immediately)
+ uloop_run(); /* wait for 'start' command via ubus */
+ else
+ pipe_send_start_container(NULL);
+}
+
+static void pipe_send_start_container(struct uloop_timeout *t)
+{
+ char sig_buf[1];
+
+ jail_oci_state = OCI_STATE_RUNNING;
+ sig_buf[0] = '!';
+ if (write(pipes[3], sig_buf, 1) < 0) {
+ ERROR("can't write to child\n");
+ free_and_exit(-1);
+ }
+ close(pipes[3]);
+
+ run_hooks(opts.hooks.poststart, post_poststart);
+}
+
+static void post_poststart(void)
+{
+ uloop_run(); /* idle here while jail is running */
+ if (jail_running) {
+ DEBUG("uloop interrupted, killing jail process\n");
+ kill(jail_process.pid, SIGTERM);
+ uloop_timeout_set(&jail_process_timeout, 1000);
+ uloop_run();
+ }
+ uloop_done();
+ poststop();
+}
+
+static void post_poststop(void);
+static void poststop(void) {
+ if (opts.namespace & CLONE_NEWNET) {
+ setns(netns_fd, CLONE_NEWNET);
+ netns_updown(getpid(), false);
+ close(netns_fd);
}
+ run_hooks(opts.hooks.poststop, post_poststop);
+}
+
+static void post_poststop(void)
+{
+ free_opts(true);
+ if (parent_ctx)
+ ubus_free(parent_ctx);
+
+ exit(jail_return_code);
}
projects / project / procd.git / blobdiff