mirror of
https://github.com/falcosecurity/falco.git
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new(userspace/falco): validate loaded configuration files against config schema.
Signed-off-by: Federico Di Pierro <nierro92@gmail.com>
This commit is contained in:
committed by
poiana
parent
4e45152521
commit
5c551df116
@@ -468,7 +468,7 @@ load_plugins: []
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plugins:
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- name: k8saudit
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library_path: libk8saudit.so
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init_config:
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init_config: ""
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# maxEventSize: 262144
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# webhookMaxBatchSize: 12582912
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# sslCertificate: /etc/falco/falco.pem
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@@ -18,9 +18,707 @@ limitations under the License.
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#include "actions.h"
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#include "falco_utils.h"
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#include <json/json.h>
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
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#include <valijson/adapters/jsoncpp_adapter.hpp>
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#include <valijson/adapters/yaml_cpp_adapter.hpp>
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#pragma GCC diagnostic pop
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#include <valijson/schema.hpp>
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#include <valijson/schema_parser.hpp>
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#include <valijson/validator.hpp>
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using namespace falco::app;
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using namespace falco::app::actions;
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static const std::string schema_json_string = R"(
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{
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"$schema": "http://json-schema.org/draft-06/schema#",
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"$ref": "#/definitions/FalcoConfig",
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"definitions": {
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"FalcoConfig": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"config_files": {
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"type": "array",
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"items": {
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"type": "string"
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}
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},
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"watch_config_files": {
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"type": "boolean"
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},
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"rules_files": {
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"type": "array",
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"items": {
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"type": "string"
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}
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},
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"rule_files": {
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"type": "array",
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"items": {
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"type": "string"
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}
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},
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"rules": {
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"type": "array",
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"items": {
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"$ref": "#/definitions/Rule"
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}
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},
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"engine": {
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"$ref": "#/definitions/Engine"
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},
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"load_plugins": {
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"type": "array",
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"items": {
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"type": "string"
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}
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},
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"plugins": {
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"type": "array",
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"items": {
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"$ref": "#/definitions/Plugin"
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}
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},
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"time_format_iso_8601": {
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"type": "boolean"
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},
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"priority": {
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"type": "string"
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},
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"json_output": {
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"type": "boolean"
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},
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"json_include_output_property": {
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"type": "boolean"
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},
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"json_include_tags_property": {
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"type": "boolean"
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},
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"buffered_outputs": {
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"type": "boolean"
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},
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"rule_matching": {
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"type": "string"
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},
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"outputs_queue": {
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"$ref": "#/definitions/OutputsQueue"
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},
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"stdout_output": {
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"$ref": "#/definitions/Output"
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},
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"syslog_output": {
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"$ref": "#/definitions/Output"
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},
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"file_output": {
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"$ref": "#/definitions/FileOutput"
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},
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"http_output": {
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"$ref": "#/definitions/HTTPOutput"
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},
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"program_output": {
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"$ref": "#/definitions/ProgramOutput"
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},
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"grpc_output": {
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"$ref": "#/definitions/Output"
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},
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"grpc": {
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"$ref": "#/definitions/Grpc"
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},
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"webserver": {
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"$ref": "#/definitions/Webserver"
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},
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"log_stderr": {
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"type": "boolean"
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},
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"log_syslog": {
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"type": "boolean"
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},
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"log_level": {
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"type": "string"
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},
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"libs_logger": {
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"$ref": "#/definitions/LibsLogger"
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},
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"output_timeout": {
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"type": "integer"
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},
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"syscall_event_timeouts": {
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"$ref": "#/definitions/SyscallEventTimeouts"
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},
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"syscall_event_drops": {
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"$ref": "#/definitions/SyscallEventDrops"
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},
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"metrics": {
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"$ref": "#/definitions/Metrics"
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},
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"base_syscalls": {
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"$ref": "#/definitions/BaseSyscalls"
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},
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"falco_libs": {
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"$ref": "#/definitions/FalcoLibs"
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}
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},
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"title": "FalcoConfig"
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},
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"BaseSyscalls": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"custom_set": {
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"type": "array",
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"items": {
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"type": "string"
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}
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},
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"repair": {
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"type": "boolean"
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}
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},
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"anyOf": [
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{
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"required": [
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"custom_set"
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]
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},
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{
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"required": [
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"repair"
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]
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}
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],
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"title": "BaseSyscalls"
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},
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"Engine": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"kind": {
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"type": "string"
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},
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"kmod": {
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"$ref": "#/definitions/Kmod"
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},
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"ebpf": {
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"$ref": "#/definitions/Ebpf"
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},
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"modern_ebpf": {
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"$ref": "#/definitions/ModernEbpf"
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},
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"replay": {
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"$ref": "#/definitions/Replay"
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},
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"gvisor": {
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"$ref": "#/definitions/Gvisor"
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}
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},
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"required": [
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"kind"
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],
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"title": "Engine"
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},
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"Ebpf": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"probe": {
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"type": "string"
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},
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"buf_size_preset": {
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"type": "integer"
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},
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"drop_failed_exit": {
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"type": "boolean"
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}
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},
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"required": [
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"probe"
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],
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"title": "Ebpf"
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},
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"Gvisor": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"config": {
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"type": "string"
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},
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"root": {
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"type": "string"
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}
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},
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"required": [
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"config",
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"root"
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],
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"title": "Gvisor"
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},
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"Kmod": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"buf_size_preset": {
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"type": "integer"
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},
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"drop_failed_exit": {
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"type": "boolean"
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}
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},
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"title": "Kmod"
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},
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"ModernEbpf": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"cpus_for_each_buffer": {
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"type": "integer"
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},
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"buf_size_preset": {
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"type": "integer"
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},
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"drop_failed_exit": {
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"type": "boolean"
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}
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},
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"title": "ModernEbpf"
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},
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"Replay": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"capture_file": {
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"type": "string"
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}
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},
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"required": [
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"capture_file"
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],
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"title": "Replay"
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},
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"FalcoLibs": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"thread_table_size": {
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"type": "integer"
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}
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},
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"required": [
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"thread_table_size"
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],
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"title": "FalcoLibs"
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},
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"FileOutput": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"enabled": {
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"type": "boolean"
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},
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"keep_alive": {
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"type": "boolean"
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},
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"filename": {
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"type": "string"
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}
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},
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"required": [
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"enabled",
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"filename",
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"keep_alive"
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],
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"title": "FileOutput"
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},
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"Grpc": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"enabled": {
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"type": "boolean"
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},
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"bind_address": {
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"type": "string"
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},
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"threadiness": {
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"type": "integer"
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}
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},
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"required": [
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"bind_address",
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"enabled",
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"threadiness"
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],
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"title": "Grpc"
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},
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"Output": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"enabled": {
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"type": "boolean"
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}
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},
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"required": [
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"enabled"
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],
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"title": "Output"
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},
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"HTTPOutput": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"enabled": {
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"type": "boolean"
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},
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"url": {
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"type": "string",
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"format": "uri",
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"qt-uri-protocols": [
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"http"
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]
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},
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"user_agent": {
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"type": "string"
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},
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"insecure": {
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"type": "boolean"
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},
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"ca_cert": {
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"type": "string"
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},
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"ca_bundle": {
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"type": "string"
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},
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"ca_path": {
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"type": "string"
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},
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"mtls": {
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"type": "boolean"
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},
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"client_cert": {
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"type": "string"
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},
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"client_key": {
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"type": "string"
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},
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"echo": {
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"type": "boolean"
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},
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"compress_uploads": {
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"type": "boolean"
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},
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"keep_alive": {
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"type": "boolean"
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}
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},
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"required": [
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"ca_bundle",
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"ca_cert",
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"ca_path",
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"client_cert",
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"client_key",
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"compress_uploads",
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"echo",
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"enabled",
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"insecure",
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"keep_alive",
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"mtls",
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"url",
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"user_agent"
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],
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"title": "HTTPOutput"
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},
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"LibsLogger": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"enabled": {
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"type": "boolean"
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},
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"severity": {
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"type": "string"
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}
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},
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"required": [
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"enabled",
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"severity"
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],
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"title": "LibsLogger"
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},
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"Metrics": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"enabled": {
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"type": "boolean"
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},
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"interval": {
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"type": "string"
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},
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"output_rule": {
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"type": "boolean"
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},
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"output_file": {
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"type": "string"
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},
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"rules_counters_enabled": {
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"type": "boolean"
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},
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"resource_utilization_enabled": {
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"type": "boolean"
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},
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"state_counters_enabled": {
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"type": "boolean"
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},
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"kernel_event_counters_enabled": {
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"type": "boolean"
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},
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"libbpf_stats_enabled": {
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"type": "boolean"
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},
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"plugins_metrics_enabled": {
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"type": "boolean"
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},
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"convert_memory_to_mb": {
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"type": "boolean"
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},
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"include_empty_values": {
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"type": "boolean"
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}
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},
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"required": [
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"convert_memory_to_mb",
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"enabled",
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"include_empty_values",
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"interval",
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"kernel_event_counters_enabled",
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"libbpf_stats_enabled",
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"output_file",
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"output_rule",
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"plugins_metrics_enabled",
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"resource_utilization_enabled",
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"rules_counters_enabled",
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"state_counters_enabled"
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],
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"title": "Metrics"
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},
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"OutputsQueue": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"capacity": {
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"type": "integer"
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}
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},
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"required": [
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"capacity"
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],
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"title": "OutputsQueue"
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},
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"Plugin": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
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"name": {
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"type": "string"
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},
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"library_path": {
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"type": "string"
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},
|
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"init_config": {
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"type": "string"
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},
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"open_params": {
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"type": "string"
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}
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},
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"required": [
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"library_path",
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"name"
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],
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"title": "Plugin"
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},
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"ProgramOutput": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
|
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"enabled": {
|
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"type": "boolean"
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||||
},
|
||||
"keep_alive": {
|
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"type": "boolean"
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},
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"program": {
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"type": "string"
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}
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||||
},
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"required": [
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"enabled",
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"keep_alive",
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"program"
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],
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"title": "ProgramOutput"
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||||
},
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"Rule": {
|
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"type": "object",
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"additionalProperties": false,
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"properties": {
|
||||
"disable": {
|
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"$ref": "#/definitions/Able"
|
||||
},
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||||
"enable": {
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||||
"$ref": "#/definitions/Able"
|
||||
}
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||||
},
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"required": [],
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"title": "Rule"
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||||
},
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"Able": {
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"type": "object",
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"additionalProperties": false,
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"properties": {
|
||||
"rule": {
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"type": "string"
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||||
},
|
||||
"tag": {
|
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"type": "string"
|
||||
}
|
||||
},
|
||||
"title": "Able"
|
||||
},
|
||||
"SyscallEventDrops": {
|
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"type": "object",
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||||
"additionalProperties": false,
|
||||
"properties": {
|
||||
"threshold": {
|
||||
"type": "number"
|
||||
},
|
||||
"actions": {
|
||||
"type": "array",
|
||||
"items": {
|
||||
"type": "string"
|
||||
}
|
||||
},
|
||||
"rate": {
|
||||
"type": "number"
|
||||
},
|
||||
"max_burst": {
|
||||
"type": "integer"
|
||||
},
|
||||
"simulate_drops": {
|
||||
"type": "boolean"
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"actions",
|
||||
"max_burst",
|
||||
"rate",
|
||||
"simulate_drops",
|
||||
"threshold"
|
||||
],
|
||||
"title": "SyscallEventDrops"
|
||||
},
|
||||
"SyscallEventTimeouts": {
|
||||
"type": "object",
|
||||
"additionalProperties": false,
|
||||
"properties": {
|
||||
"max_consecutives": {
|
||||
"type": "integer"
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"max_consecutives"
|
||||
],
|
||||
"title": "SyscallEventTimeouts"
|
||||
},
|
||||
"Webserver": {
|
||||
"type": "object",
|
||||
"additionalProperties": false,
|
||||
"properties": {
|
||||
"enabled": {
|
||||
"type": "boolean"
|
||||
},
|
||||
"threadiness": {
|
||||
"type": "integer"
|
||||
},
|
||||
"listen_port": {
|
||||
"type": "integer"
|
||||
},
|
||||
"listen_address": {
|
||||
"type": "string"
|
||||
},
|
||||
"k8s_healthz_endpoint": {
|
||||
"type": "string"
|
||||
},
|
||||
"prometheus_metrics_enabled": {
|
||||
"type": "boolean"
|
||||
},
|
||||
"ssl_enabled": {
|
||||
"type": "boolean"
|
||||
},
|
||||
"ssl_certificate": {
|
||||
"type": "string"
|
||||
}
|
||||
},
|
||||
"required": [
|
||||
"enabled",
|
||||
"k8s_healthz_endpoint",
|
||||
"listen_address",
|
||||
"listen_port",
|
||||
"prometheus_metrics_enabled",
|
||||
"ssl_certificate",
|
||||
"ssl_enabled",
|
||||
"threadiness"
|
||||
],
|
||||
"title": "Webserver"
|
||||
}
|
||||
}
|
||||
}
|
||||
)";
|
||||
|
||||
static std::string validate_config_files(const std::string &config_file)
|
||||
{
|
||||
// Parse schema to a Json::Value, just once.
|
||||
static Json::Value schemaJson;
|
||||
if (schemaJson.empty())
|
||||
{
|
||||
if(!Json::Reader().parse(schema_json_string, schemaJson) || schemaJson.type() != Json::objectValue)
|
||||
{
|
||||
throw falco_exception("failed to parse config schema");
|
||||
}
|
||||
}
|
||||
|
||||
// Parse config to a YAML::Node. If we reach this point,
|
||||
// this cannot fail because we have already parsed the config file
|
||||
YAML::Node configYAML = YAML::LoadFile(config_file);
|
||||
|
||||
// Validate the yaml against our json schema
|
||||
valijson::Schema schemaDef;
|
||||
valijson::SchemaParser schemaParser;
|
||||
valijson::Validator validator(valijson::Validator::kWeakTypes);
|
||||
valijson::ValidationResults validationResults;
|
||||
valijson::adapters::YamlCppAdapter configAdapter(configYAML);
|
||||
valijson::adapters::JsonCppAdapter schemaAdapter(schemaJson);
|
||||
schemaParser.populateSchema(schemaAdapter, schemaDef);
|
||||
|
||||
if (!validator.validate(schemaDef, configAdapter, &validationResults))
|
||||
{
|
||||
valijson::ValidationResults::Error error;
|
||||
// report only the top-most error
|
||||
if (validationResults.popError(error))
|
||||
{
|
||||
return std::string("validation failed for ")
|
||||
+ std::accumulate(error.context.begin(), error.context.end(), std::string(""))
|
||||
+ ": "
|
||||
+ error.description;
|
||||
}
|
||||
return "validation failed";
|
||||
}
|
||||
return "validated";
|
||||
}
|
||||
|
||||
// applies legacy/in-deprecation options to the current state
|
||||
static falco::app::run_result apply_deprecated_options(const falco::app::state& s)
|
||||
{
|
||||
@@ -63,7 +761,8 @@ falco::app::run_result falco::app::actions::load_config(const falco::app::state&
|
||||
falco_logger::log(falco_logger::level::INFO, "Falco initialized with configuration files:\n");
|
||||
for (const auto& path : loaded_conf_files)
|
||||
{
|
||||
falco_logger::log(falco_logger::level::INFO, std::string(" ") + path + "\n");
|
||||
auto validation_status = validate_config_files(path);
|
||||
falco_logger::log(falco_logger::level::INFO, std::string(" ") + path + " | " + validation_status + "\n");
|
||||
}
|
||||
}
|
||||
|
||||
@@ -85,4 +784,4 @@ falco::app::run_result falco::app::actions::require_config_file(const falco::app
|
||||
}
|
||||
#endif // __EMSCRIPTEN__
|
||||
return run_result::ok();
|
||||
}
|
||||
}
|
Reference in New Issue
Block a user