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-rw-r--r--src/nspawn/nspawn.c83
1 files changed, 56 insertions, 27 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index fec39d6448..ffd8fd4ef5 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -60,6 +60,29 @@ static char *arg_uuid = NULL;
static bool arg_private_network = false;
static bool arg_read_only = false;
static bool arg_boot = false;
+static uint64_t arg_retain =
+ (1ULL << CAP_CHOWN) |
+ (1ULL << CAP_DAC_OVERRIDE) |
+ (1ULL << CAP_DAC_READ_SEARCH) |
+ (1ULL << CAP_FOWNER) |
+ (1ULL << CAP_FSETID) |
+ (1ULL << CAP_IPC_OWNER) |
+ (1ULL << CAP_KILL) |
+ (1ULL << CAP_LEASE) |
+ (1ULL << CAP_LINUX_IMMUTABLE) |
+ (1ULL << CAP_NET_BIND_SERVICE) |
+ (1ULL << CAP_NET_BROADCAST) |
+ (1ULL << CAP_NET_RAW) |
+ (1ULL << CAP_SETGID) |
+ (1ULL << CAP_SETFCAP) |
+ (1ULL << CAP_SETPCAP) |
+ (1ULL << CAP_SETUID) |
+ (1ULL << CAP_SYS_ADMIN) |
+ (1ULL << CAP_SYS_CHROOT) |
+ (1ULL << CAP_SYS_NICE) |
+ (1ULL << CAP_SYS_PTRACE) |
+ (1ULL << CAP_SYS_TTY_CONFIG) |
+ (1ULL << CAP_SYS_RESOURCE);
static int help(void) {
@@ -72,7 +95,8 @@ static int help(void) {
" -C --controllers=LIST Put the container in specified comma-separated cgroup hierarchies\n"
" --uuid=UUID Set a specific machine UUID for the container\n"
" --private-network Disable network in container\n"
- " --read-only Mount the root directory read-only\n",
+ " --read-only Mount the root directory read-only\n"
+ " --capability=CAP In addition to the default, retain specified capability\n",
program_invocation_short_name);
return 0;
@@ -83,7 +107,8 @@ static int parse_argv(int argc, char *argv[]) {
enum {
ARG_PRIVATE_NETWORK = 0x100,
ARG_UUID,
- ARG_READ_ONLY
+ ARG_READ_ONLY,
+ ARG_CAPABILITY
};
static const struct option options[] = {
@@ -95,6 +120,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "boot", no_argument, NULL, 'b' },
{ "uuid", required_argument, NULL, ARG_UUID },
{ "read-only", no_argument, NULL, ARG_READ_ONLY },
+ { "capability", required_argument, NULL, ARG_CAPABILITY },
{ NULL, 0, NULL, 0 }
};
@@ -157,6 +183,33 @@ static int parse_argv(int argc, char *argv[]) {
arg_read_only = true;
break;
+ case ARG_CAPABILITY: {
+ char *state, *word;
+ size_t length;
+
+ FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
+ cap_value_t cap;
+ char *t;
+
+ t = strndup(word, length);
+ if (!t) {
+ log_error("Out of memory.");
+ return -ENOMEM;
+ }
+
+ if (cap_from_name(t, &cap) < 0) {
+ log_error("Failed to parse capability %s.", t);
+ free(t);
+ return -EINVAL;
+ }
+
+ free(t);
+ arg_retain |= 1ULL << (uint64_t) cap;
+ }
+
+ break;
+ }
+
case '?':
return -EINVAL;
@@ -544,31 +597,7 @@ static int setup_hostname(void) {
}
static int drop_capabilities(void) {
-
- static const uint64_t retain =
- (1ULL << CAP_CHOWN) |
- (1ULL << CAP_DAC_OVERRIDE) |
- (1ULL << CAP_DAC_READ_SEARCH) |
- (1ULL << CAP_FOWNER) |
- (1ULL << CAP_FSETID) |
- (1ULL << CAP_IPC_OWNER) |
- (1ULL << CAP_KILL) |
- (1ULL << CAP_LEASE) |
- (1ULL << CAP_LINUX_IMMUTABLE) |
- (1ULL << CAP_NET_BIND_SERVICE) |
- (1ULL << CAP_NET_BROADCAST) |
- (1ULL << CAP_NET_RAW) |
- (1ULL << CAP_SETGID) |
- (1ULL << CAP_SETFCAP) |
- (1ULL << CAP_SETPCAP) |
- (1ULL << CAP_SETUID) |
- (1ULL << CAP_SYS_ADMIN) |
- (1ULL << CAP_SYS_CHROOT) |
- (1ULL << CAP_SYS_NICE) |
- (1ULL << CAP_SYS_PTRACE) |
- (1ULL << CAP_SYS_TTY_CONFIG);
-
- return capability_bounding_set_drop(~retain, false);
+ return capability_bounding_set_drop(~arg_retain, false);
}
static int is_os_tree(const char *path) {