mirror of
https://git.proxmox.com/git/mirror_lxc
synced 2025-08-07 18:56:40 +00:00
conf: simplify and port caps to new list type
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner
parent
badf09ec16
commit
20ab75789e
158
src/lxc/conf.c
158
src/lxc/conf.c
@ -828,17 +828,14 @@ static int lxc_mount_auto_mounts(struct lxc_handler *handler, int flags)
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* container can't remount it read-write.
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*/
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if ((cg_flags == LXC_AUTO_CGROUP_NOSPEC) || (cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC)) {
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int has_sys_admin = 0;
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if (!lxc_list_empty(&conf->keepcaps))
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has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps);
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else
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has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps);
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if (cg_flags == LXC_AUTO_CGROUP_NOSPEC)
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cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED;
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cg_flags = has_cap(CAP_SYS_ADMIN, conf)
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? LXC_AUTO_CGROUP_RW
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: LXC_AUTO_CGROUP_MIXED;
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else
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cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED;
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cg_flags = has_cap(CAP_SYS_ADMIN, conf)
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? LXC_AUTO_CGROUP_FULL_RW
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: LXC_AUTO_CGROUP_FULL_MIXED;
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}
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if (flags & LXC_AUTO_CGROUP_FORCE)
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@ -3105,7 +3102,7 @@ out:
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return fret;
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}
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static int parse_cap(const char *cap)
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int parse_cap(const char *cap)
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{
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size_t i;
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int capid = -1;
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@ -3142,86 +3139,70 @@ static int parse_cap(const char *cap)
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return capid;
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}
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int in_caplist(int cap, struct lxc_list *caps)
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bool has_cap(int cap, struct lxc_conf *conf)
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{
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int capid;
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struct lxc_list *iterator;
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bool cap_in_list = false;
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struct cap_entry *cap_entry;
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lxc_list_for_each (iterator, caps) {
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capid = parse_cap(iterator->elem);
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if (capid == cap)
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return 1;
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list_for_each_entry(cap_entry, &conf->caps.list, head) {
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if (cap_entry->cap != cap)
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continue;
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cap_in_list = true;
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}
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return 0;
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/* The capability is kept. */
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if (conf->caps.keep)
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return cap_in_list;
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/* The capability is not dropped. */
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return !cap_in_list;
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}
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static int setup_caps(struct lxc_list *caps)
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static int setup_caps(struct lxc_conf *conf)
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{
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int capid;
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char *drop_entry;
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struct lxc_list *iterator;
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struct cap_entry *cap;
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lxc_list_for_each (iterator, caps) {
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list_for_each_entry(cap, &conf->caps.list, head) {
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int ret;
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drop_entry = iterator->elem;
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capid = parse_cap(drop_entry);
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if (capid < 0)
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return log_error(-1, "unknown capability %s", drop_entry);
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ret = prctl(PR_CAPBSET_DROP, prctl_arg(capid), prctl_arg(0),
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ret = prctl(PR_CAPBSET_DROP, prctl_arg(cap->cap), prctl_arg(0),
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prctl_arg(0), prctl_arg(0));
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if (ret < 0)
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return log_error_errno(-1, errno, "Failed to remove %s capability", drop_entry);
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DEBUG("Dropped %s (%d) capability", drop_entry, capid);
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return log_error_errno(-1, errno, "Failed to remove %s capability", cap->cap_name);
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DEBUG("Dropped %s (%d) capability", cap->cap_name, cap->cap);
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}
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DEBUG("Capabilities have been setup");
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return 0;
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}
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static int dropcaps_except(struct lxc_list *caps)
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static int dropcaps_except(struct lxc_conf *conf)
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{
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__do_free int *caplist = NULL;
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int i, capid, numcaps;
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char *keep_entry;
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struct lxc_list *iterator;
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int numcaps;
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struct cap_entry *cap;
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numcaps = lxc_caps_last_cap() + 1;
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if (numcaps <= 0 || numcaps > 200)
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return -1;
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return ret_errno(EINVAL);
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TRACE("Found %d capabilities", numcaps);
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/* caplist[i] is 1 if we keep capability i */
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caplist = must_realloc(NULL, numcaps * sizeof(int));
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memset(caplist, 0, numcaps * sizeof(int));
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lxc_list_for_each (iterator, caps) {
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keep_entry = iterator->elem;
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capid = parse_cap(keep_entry);
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if (capid == -2)
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continue;
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if (capid < 0)
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return log_error(-1, "Unknown capability %s", keep_entry);
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DEBUG("Keep capability %s (%d)", keep_entry, capid);
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caplist[capid] = 1;
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}
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for (i = 0; i < numcaps; i++) {
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list_for_each_entry(cap, &conf->caps.list, head) {
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int ret;
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if (caplist[i])
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if (cap->cap >= numcaps)
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continue;
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ret = prctl(PR_CAPBSET_DROP, prctl_arg(i), prctl_arg(0),
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ret = prctl(PR_CAPBSET_DROP, prctl_arg(cap->cap), prctl_arg(0),
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prctl_arg(0), prctl_arg(0));
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if (ret < 0)
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return log_error_errno(-1, errno, "Failed to remove capability %d", i);
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return log_error_errno(-1, errno,
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"Failed to remove capability %s (%d)",
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cap->cap_name, cap->cap);
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DEBUG("Keep capability %s (%d)", cap->cap_name, cap->cap);
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}
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DEBUG("Capabilities have been setup");
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@ -3385,8 +3366,7 @@ struct lxc_conf *lxc_conf_init(void)
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new->bpf_devices.list_type = LXC_BPF_DEVICE_CGROUP_ALLOWLIST;
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INIT_LIST_HEAD(&(new->bpf_devices).devices);
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lxc_list_init(&new->mount_list);
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lxc_list_init(&new->caps);
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lxc_list_init(&new->keepcaps);
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INIT_LIST_HEAD(&new->caps.list);
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INIT_LIST_HEAD(&new->id_map);
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new->root_nsuid_map = NULL;
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new->root_nsgid_map = NULL;
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@ -4275,6 +4255,20 @@ int lxc_sync_fds_child(struct lxc_handler *handler)
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return 0;
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}
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static int setcup_capabilities(struct lxc_conf *conf)
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{
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int ret;
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if (conf->caps.keep)
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ret = dropcaps_except(conf);
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else
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ret = setup_caps(conf);
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if (ret < 0)
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return log_error(-1, "Failed to %s capabilities", conf->caps.keep ? "keep" : "drop");
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return 0;
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}
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int lxc_setup(struct lxc_handler *handler)
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{
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int ret;
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@ -4418,15 +4412,9 @@ int lxc_setup(struct lxc_handler *handler)
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if (ret < 0)
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return log_error(-1, "Failed to setup sysctl parameters");
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if (!lxc_list_empty(&lxc_conf->keepcaps)) {
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if (!lxc_list_empty(&lxc_conf->caps))
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return log_error(-1, "Container requests lxc.cap.drop and lxc.cap.keep: either use lxc.cap.drop or lxc.cap.keep, not both");
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if (dropcaps_except(&lxc_conf->keepcaps))
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return log_error(-1, "Failed to keep capabilities");
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} else if (setup_caps(&lxc_conf->caps)) {
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return log_error(-1, "Failed to drop capabilities");
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}
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ret = setcup_capabilities(lxc_conf);
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if (ret < 0)
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return log_error(-1, "Failed to setup capabilities");
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put_lxc_rootfs(&handler->conf->rootfs, true);
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NOTICE("The container \"%s\" is set up", name);
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@ -4463,15 +4451,16 @@ int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf,
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int lxc_clear_config_caps(struct lxc_conf *c)
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{
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struct lxc_list *it, *next;
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struct cap_entry *cap, *ncap;
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lxc_list_for_each_safe (it, &c->caps, next) {
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lxc_list_del(it);
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free(it->elem);
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free(it);
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list_for_each_entry_safe(cap, ncap, &c->caps.list, head) {
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list_del(&cap->head);
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free(cap->cap_name);
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free(cap);
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}
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lxc_list_init(&c->caps);
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c->caps.keep = false;
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INIT_LIST_HEAD(&c->caps.list);
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return 0;
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}
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@ -4500,20 +4489,6 @@ int lxc_clear_idmaps(struct lxc_conf *c)
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return lxc_free_idmap(&c->id_map);
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}
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int lxc_clear_config_keepcaps(struct lxc_conf *c)
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{
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struct lxc_list *it, *next;
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lxc_list_for_each_safe (it, &c->keepcaps, next) {
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lxc_list_del(it);
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free(it->elem);
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free(it);
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}
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lxc_list_init(&c->keepcaps);
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return 0;
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}
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int lxc_clear_namespace(struct lxc_conf *c)
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{
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for (int i = 0; i < LXC_NS_MAX; i++)
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@ -4789,7 +4764,6 @@ void lxc_conf_free(struct lxc_conf *conf)
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free(conf->lsm_se_keyring_context);
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lxc_seccomp_free(&conf->seccomp);
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lxc_clear_config_caps(conf);
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lxc_clear_config_keepcaps(conf);
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lxc_clear_cgroups(conf, "lxc.cgroup", CGROUP_SUPER_MAGIC);
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lxc_clear_cgroups(conf, "lxc.cgroup2", CGROUP2_SUPER_MAGIC);
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lxc_clear_cgroups_devices(conf);
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@ -343,6 +343,17 @@ struct environment_entry {
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struct list_head head;
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};
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struct cap_entry {
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char *cap_name;
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int cap;
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struct list_head head;
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};
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struct caps {
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int keep;
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struct list_head list;
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};
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struct lxc_conf {
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/* Pointer to the name of the container. Do not free! */
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const char *name;
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@ -381,8 +392,7 @@ struct lxc_conf {
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struct lxc_list mount_list;
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};
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struct lxc_list caps;
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struct lxc_list keepcaps;
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struct caps caps;
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/* /dev/tty<idx> devices */
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struct lxc_tty_info ttys;
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@ -530,7 +540,6 @@ __hidden extern int lxc_map_ids(struct list_head *idmap, pid_t pid);
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__hidden extern int lxc_create_tty(const char *name, struct lxc_conf *conf);
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__hidden extern void lxc_delete_tty(struct lxc_tty_info *ttys);
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__hidden extern int lxc_clear_config_caps(struct lxc_conf *c);
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__hidden extern int lxc_clear_config_keepcaps(struct lxc_conf *c);
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__hidden extern int lxc_clear_cgroups(struct lxc_conf *c, const char *key, int version);
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__hidden extern int lxc_clear_mount_entries(struct lxc_conf *c);
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__hidden extern int lxc_clear_automounts(struct lxc_conf *c);
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@ -563,17 +572,14 @@ __hidden extern void sort_cgroup_settings(struct lxc_conf *conf);
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__hidden extern int run_script(const char *name, const char *section, const char *script, ...);
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__hidden extern int run_script_argv(const char *name, unsigned int hook_version, const char *section,
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const char *script, const char *hookname, char **argsin);
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__hidden extern int in_caplist(int cap, struct lxc_list *caps);
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__hidden extern bool has_cap(int cap, struct lxc_conf *conf);
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static inline bool lxc_wants_cap(int cap, struct lxc_conf *conf)
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{
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if (lxc_caps_last_cap() < cap)
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return false;
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if (!lxc_list_empty(&conf->keepcaps))
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return in_caplist(cap, &conf->keepcaps);
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return !in_caplist(cap, &conf->caps);
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return has_cap(cap, conf);
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}
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__hidden extern int setup_sysctl_parameters(struct lxc_conf *conf);
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@ -650,5 +656,6 @@ static inline int lxc_personality(personality_t persona)
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}
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__hidden extern int lxc_set_environment(const struct lxc_conf *conf);
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__hidden extern int parse_cap(const char *cap);
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#endif /* __LXC_CONF_H */
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@ -2400,70 +2400,96 @@ int add_elem_to_mount_list(const char *value, struct lxc_conf *lxc_conf) {
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return set_config_mount(NULL, value, lxc_conf, NULL);
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}
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static int add_cap_entry(struct lxc_conf *conf, char *caps, bool keep)
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{
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char *token;
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/*
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* In case several capability keep is specified in a single line split
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* these caps in a single element for the list.
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*/
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lxc_iterate_parts(token, caps, " \t") {
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__do_free struct cap_entry *new_cap = NULL;
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int cap;
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if (strequal(token, "none")) {
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if (!keep)
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return syserror_set(-EINVAL, "The \"none\" keyword is only valid when keeping caps");
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lxc_clear_config_caps(conf);
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continue;
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}
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cap = parse_cap(token);
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if (cap < 0) {
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if (cap != -2)
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return syserror_set(-EINVAL, "Invalid capability specified");
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INFO("Ignoring unknown capability \"%s\"", token);
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continue;
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}
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new_cap = zalloc(sizeof(struct cap_entry));
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if (!new_cap)
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return ret_errno(ENOMEM);
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new_cap->cap_name = strdup(token);
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if (!new_cap->cap_name)
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return ret_errno(ENOMEM);
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new_cap->cap = cap;
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list_add_tail(&new_cap->head, &conf->caps.list);
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move_ptr(new_cap);
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}
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return 0;
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}
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static int set_config_cap_keep(const char *key, const char *value,
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struct lxc_conf *lxc_conf, void *data)
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{
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__do_free char *keepcaps = NULL;
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__do_free struct lxc_list *keeplist = NULL;
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char *token;
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__do_free char *caps = NULL;
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int ret;
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if (lxc_config_value_empty(value))
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return lxc_clear_config_keepcaps(lxc_conf);
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return lxc_clear_config_caps(lxc_conf);
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keepcaps = strdup(value);
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if (!keepcaps)
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caps = strdup(value);
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if (!caps)
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return ret_errno(ENOMEM);
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/* In case several capability keep is specified in a single line
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* split these caps in a single element for the list.
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*/
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lxc_iterate_parts(token, keepcaps, " \t") {
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if (strequal(token, "none"))
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lxc_clear_config_keepcaps(lxc_conf);
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if (!lxc_conf->caps.keep && !list_empty(&lxc_conf->caps.list))
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return syserror_set(-EINVAL, "Keeping and dropping capabilities are mutually exclusive");
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keeplist = lxc_list_new();
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if (!keeplist)
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return ret_errno(ENOMEM);
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keeplist->elem = strdup(token);
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if (!keeplist->elem)
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return ret_errno(ENOMEM);
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lxc_list_add_tail(&lxc_conf->keepcaps, move_ptr(keeplist));
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}
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ret = add_cap_entry(lxc_conf, caps, true);
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if (ret < 0)
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return ret;
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lxc_conf->caps.keep = true;
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return 0;
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}
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static int set_config_cap_drop(const char *key, const char *value,
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struct lxc_conf *lxc_conf, void *data)
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{
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__do_free char *dropcaps = NULL;
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__do_free struct lxc_list *droplist = NULL;
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char *token;
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__do_free char *caps = NULL;
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int ret;
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if (lxc_config_value_empty(value))
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return lxc_clear_config_caps(lxc_conf);
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dropcaps = strdup(value);
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if (!dropcaps)
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if (lxc_conf->caps.keep)
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return syserror_set(-EINVAL, "Keeping and dropping capabilities are mutually exclusive");
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caps = strdup(value);
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if (!caps)
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return ret_errno(ENOMEM);
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/* In case several capability drop is specified in a single line
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* split these caps in a single element for the list.
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*/
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lxc_iterate_parts(token, dropcaps, " \t") {
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droplist = lxc_list_new();
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if (!droplist)
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return ret_errno(ENOMEM);
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droplist->elem = strdup(token);
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if (!droplist->elem)
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return ret_errno(ENOMEM);
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lxc_list_add_tail(&lxc_conf->caps, move_ptr(droplist));
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}
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ret = add_cap_entry(lxc_conf, caps, false);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
lxc_conf->caps.keep = false;
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -4255,15 +4281,15 @@ static int get_config_cap_drop(const char *key, char *retv, int inlen,
|
||||
struct lxc_conf *c, void *data)
|
||||
{
|
||||
int len, fulllen = 0;
|
||||
struct lxc_list *it;
|
||||
struct cap_entry *cap;
|
||||
|
||||
if (!retv)
|
||||
inlen = 0;
|
||||
else
|
||||
memset(retv, 0, inlen);
|
||||
|
||||
lxc_list_for_each(it, &c->caps) {
|
||||
strprint(retv, inlen, "%s\n", (char *)it->elem);
|
||||
list_for_each_entry(cap, &c->caps.list, head) {
|
||||
strprint(retv, inlen, "%s\n", cap->cap_name);
|
||||
}
|
||||
|
||||
return fulllen;
|
||||
@ -4273,15 +4299,15 @@ static int get_config_cap_keep(const char *key, char *retv, int inlen,
|
||||
struct lxc_conf *c, void *data)
|
||||
{
|
||||
int len, fulllen = 0;
|
||||
struct lxc_list *it;
|
||||
struct cap_entry *cap;
|
||||
|
||||
if (!retv)
|
||||
inlen = 0;
|
||||
else
|
||||
memset(retv, 0, inlen);
|
||||
|
||||
lxc_list_for_each(it, &c->keepcaps) {
|
||||
strprint(retv, inlen, "%s\n", (char *)it->elem);
|
||||
list_for_each_entry(cap, &c->caps.list, head) {
|
||||
strprint(retv, inlen, "%s\n", cap->cap_name);
|
||||
}
|
||||
|
||||
return fulllen;
|
||||
@ -5024,7 +5050,7 @@ static inline int clr_config_cap_drop(const char *key, struct lxc_conf *c,
|
||||
static inline int clr_config_cap_keep(const char *key, struct lxc_conf *c,
|
||||
void *data)
|
||||
{
|
||||
return lxc_clear_config_keepcaps(c);
|
||||
return lxc_clear_config_caps(c);
|
||||
}
|
||||
|
||||
static inline int clr_config_console_path(const char *key, struct lxc_conf *c,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user