@@ -28,6 +28,20 @@ configuration options on the command line. For the same key, the last
option wins, but the lists accumulate (see below for configuration
file format).
+If an allowed RPCs list is defined in the configuration, then all
+RPCs will be blocked by default, except for the allowed list.
+
+If a blocked RPCs list is defined in the configuration, then all
+RPCs will be allowed by default, except for the blocked list.
+
+If both allowed and blocked RPCs lists are defined in the configuration,
+then all RPCs will be blocked by default, then the allowed list will
+be applied, followed by the blocked list.
+
+While filesystems are frozen, all except for a designated safe set
+of RPCs will blocked, regardless of what the general configuration
+declares.
+
Options
-------
@@ -1136,12 +1136,6 @@ error:
#endif /* HAVE_GETIFADDRS */
-/* add unsupported commands to the list of blocked RPCs */
-GList *ga_command_init_blockedrpcs(GList *blockedrpcs)
-{
- return blockedrpcs;
-}
-
/* register init/cleanup routines for stateful command groups */
void ga_command_state_init(GAState *s, GACommandState *cs)
{
@@ -1958,12 +1958,6 @@ done:
g_free(rawpasswddata);
}
-/* add unsupported commands to the list of blocked RPCs */
-GList *ga_command_init_blockedrpcs(GList *blockedrpcs)
-{
- return blockedrpcs;
-}
-
/* register init/cleanup routines for stateful command groups */
void ga_command_state_init(GAState *s, GACommandState *cs)
{
@@ -423,60 +423,79 @@ static gint ga_strcmp(gconstpointer str1, gconstpointer str2)
return strcmp(str1, str2);
}
-/* disable commands that aren't safe for fsfreeze */
-static void ga_disable_not_allowed_freeze(const QmpCommand *cmd, void *opaque)
+static bool ga_command_is_allowed(const QmpCommand *cmd, GAState *state)
{
- bool allowed = false;
int i = 0;
+ GAConfig *config = state->config;
const char *name = qmp_command_name(cmd);
+ /* Fallback policy is allow everything */
+ bool allowed = true;
- while (ga_freeze_allowlist[i] != NULL) {
- if (strcmp(name, ga_freeze_allowlist[i]) == 0) {
+ if (config->allowedrpcs) {
+ /*
+ * If an allow-list is given, this changes the fallback
+ * policy to deny everything
+ */
+ allowed = false;
+
+ if (g_list_find_custom(config->allowedrpcs, name, ga_strcmp) != NULL) {
allowed = true;
}
- i++;
}
- if (!allowed) {
- g_debug("disabling command: %s", name);
- qmp_disable_command(&ga_commands, name, "the agent is in frozen state");
- }
-}
-/* [re-]enable all commands, except those explicitly blocked by user */
-static void ga_enable_non_blocked(const QmpCommand *cmd, void *opaque)
-{
- GAState *s = opaque;
- GList *blockedrpcs = s->blockedrpcs;
- GList *allowedrpcs = s->allowedrpcs;
- const char *name = qmp_command_name(cmd);
-
- if (g_list_find_custom(blockedrpcs, name, ga_strcmp) == NULL) {
- if (qmp_command_is_enabled(cmd)) {
- return;
+ /*
+ * If both allowedrpcs and blockedrpcs are set, the blocked
+ * list will take priority
+ */
+ if (config->blockedrpcs) {
+ if (g_list_find_custom(config->blockedrpcs, name, ga_strcmp) != NULL) {
+ allowed = false;
}
+ }
- if (allowedrpcs &&
- g_list_find_custom(allowedrpcs, name, ga_strcmp) == NULL) {
- return;
- }
+ /*
+ * If frozen, this filtering must take priority over
+ * absolutely everything
+ */
+ if (state->frozen) {
+ allowed = false;
- g_debug("enabling command: %s", name);
- qmp_enable_command(&ga_commands, name);
+ while (ga_freeze_allowlist[i] != NULL) {
+ if (strcmp(name, ga_freeze_allowlist[i]) == 0) {
+ allowed = true;
+ }
+ i++;
+ }
}
+
+ return allowed;
}
-/* disable commands that aren't allowed */
-static void ga_disable_not_allowed(const QmpCommand *cmd, void *opaque)
+static void ga_apply_command_filters_iter(const QmpCommand *cmd, void *opaque)
{
- GList *allowedrpcs = opaque;
+ GAState *state = opaque;
+ bool want = ga_command_is_allowed(cmd, state);
+ bool have = qmp_command_is_enabled(cmd);
const char *name = qmp_command_name(cmd);
- if (g_list_find_custom(allowedrpcs, name, ga_strcmp) == NULL) {
+ if (want == have) {
+ return;
+ }
+
+ if (have) {
g_debug("disabling command: %s", name);
qmp_disable_command(&ga_commands, name, "the command is not allowed");
+ } else {
+ g_debug("enabling command: %s", name);
+ qmp_enable_command(&ga_commands, name);
}
}
+static void ga_apply_command_filters(GAState *state)
+{
+ qmp_for_each_command(&ga_commands, ga_apply_command_filters_iter, state);
+}
+
static bool ga_create_file(const char *path)
{
int fd = open(path, O_CREAT | O_WRONLY, S_IWUSR | S_IRUSR);
@@ -509,15 +528,14 @@ void ga_set_frozen(GAState *s)
if (ga_is_frozen(s)) {
return;
}
- /* disable all forbidden (for frozen state) commands */
- qmp_for_each_command(&ga_commands, ga_disable_not_allowed_freeze, NULL);
g_warning("disabling logging due to filesystem freeze");
- ga_disable_logging(s);
s->frozen = true;
if (!ga_create_file(s->state_filepath_isfrozen)) {
g_warning("unable to create %s, fsfreeze may not function properly",
s->state_filepath_isfrozen);
}
+ ga_apply_command_filters(s);
+ ga_disable_logging(s);
}
void ga_unset_frozen(GAState *s)
@@ -549,12 +567,12 @@ void ga_unset_frozen(GAState *s)
}
/* enable all disabled, non-blocked and allowed commands */
- qmp_for_each_command(&ga_commands, ga_enable_non_blocked, s);
s->frozen = false;
if (!ga_delete_file(s->state_filepath_isfrozen)) {
g_warning("unable to delete %s, fsfreeze may not function properly",
s->state_filepath_isfrozen);
}
+ ga_apply_command_filters(s);
}
#ifdef CONFIG_FSFREEZE
@@ -1086,13 +1104,6 @@ static void config_load(GAConfig *config, const char *confpath, bool required)
split_list(config->aliststr, ","));
}
- if (g_key_file_has_key(keyfile, "general", "block-rpcs", NULL) &&
- g_key_file_has_key(keyfile, "general", "allow-rpcs", NULL)) {
- g_critical("wrong config, using 'block-rpcs' and 'allow-rpcs' keys at"
- " the same time is not allowed");
- exit(EXIT_FAILURE);
- }
-
end:
g_key_file_free(keyfile);
if (gerr && (required ||
@@ -1172,7 +1183,6 @@ static void config_parse(GAConfig *config, int argc, char **argv)
{
const char *sopt = "hVvdc:m:p:l:f:F::b:a:s:t:Dr";
int opt_ind = 0, ch;
- bool block_rpcs = false, allow_rpcs = false;
const struct option lopt[] = {
{ "help", 0, NULL, 'h' },
{ "version", 0, NULL, 'V' },
@@ -1268,7 +1278,6 @@ static void config_parse(GAConfig *config, int argc, char **argv)
}
config->blockedrpcs = g_list_concat(config->blockedrpcs,
split_list(optarg, ","));
- block_rpcs = true;
break;
}
case 'a': {
@@ -1278,7 +1287,6 @@ static void config_parse(GAConfig *config, int argc, char **argv)
}
config->allowedrpcs = g_list_concat(config->allowedrpcs,
split_list(optarg, ","));
- allow_rpcs = true;
break;
}
#ifdef _WIN32
@@ -1319,12 +1327,6 @@ static void config_parse(GAConfig *config, int argc, char **argv)
exit(EXIT_FAILURE);
}
}
-
- if (block_rpcs && allow_rpcs) {
- g_critical("wrong commandline, using --block-rpcs and --allow-rpcs at the"
- " same time is not allowed");
- exit(EXIT_FAILURE);
- }
}
static void config_free(GAConfig *config)
@@ -1435,7 +1437,6 @@ static GAState *initialize_agent(GAConfig *config, int socket_activation)
s->deferred_options.log_filepath = config->log_filepath;
}
ga_disable_logging(s);
- qmp_for_each_command(&ga_commands, ga_disable_not_allowed_freeze, NULL);
} else {
if (config->daemonize) {
become_daemon(config->pid_filepath);
@@ -1459,25 +1460,6 @@ static GAState *initialize_agent(GAConfig *config, int socket_activation)
return NULL;
}
- if (config->allowedrpcs) {
- qmp_for_each_command(&ga_commands, ga_disable_not_allowed, config->allowedrpcs);
- s->allowedrpcs = config->allowedrpcs;
- }
-
- /*
- * Some commands can be blocked due to system limitation.
- * Initialize blockedrpcs list even if allowedrpcs specified.
- */
- config->blockedrpcs = ga_command_init_blockedrpcs(config->blockedrpcs);
- if (config->blockedrpcs) {
- GList *l = config->blockedrpcs;
- s->blockedrpcs = config->blockedrpcs;
- do {
- g_debug("disabling command: %s", (char *)l->data);
- qmp_disable_command(&ga_commands, l->data, NULL);
- l = g_list_next(l);
- } while (l);
- }
s->command_state = ga_command_state_new();
ga_command_state_init(s, s->command_state);
ga_command_state_init_all(s->command_state);
@@ -1503,6 +1485,8 @@ static GAState *initialize_agent(GAConfig *config, int socket_activation)
}
#endif
+ ga_apply_command_filters(s);
+
ga_state = s;
return s;
}