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Implement few configuration options for module

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mrkubax10
2026-05-04 23:07:37 +02:00
parent 5224b003e1
commit faf28b28c9
1 changed files with 82 additions and 21 deletions
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mod_webgate.c
+82 -21
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@@ -15,28 +15,63 @@ Copyright (C) 2026 mrkubax10 <mrkubax10@onet.pl>
#include <util_md5.h>
#define MAX_TOKEN_LENGTH 30
#define TRACKED_TOKEN_COUNT 1000 // TODO: Allow changing this in server configuration
static void register_hooks(apr_pool_t* pool);
static void* create_directory_configuration(apr_pool_t* pool, char* context);
static void* merge_directory_configuration(apr_pool_t* pool, void* p_base, void* p_override);
static const char* global_config_set_tracked_token_count(cmd_parms* cmd, void* cfg, const char* count);
static const char* context_config_set_enabled(cmd_parms* cmd, void* cfg, const char* enabled);
static const command_rec config_directives[] = {
AP_INIT_TAKE1("webgateTrackedTokenCount", global_config_set_tracked_token_count, NULL, RSRC_CONF, "Set maximum amount of verified or blocked access tokens which module will track"),
AP_INIT_TAKE1("webgateEnabled", context_config_set_enabled, NULL, ACCESS_CONF, "Configure whether mod_webgate is supposed to be enabled for this location or directory"),
{}
};
module AP_MODULE_DECLARE_DATA webgate_module = {
STANDARD20_MODULE_STUFF,
create_directory_configuration,
merge_directory_configuration,
NULL,
NULL,
config_directives,
register_hooks,
AP_MODULE_FLAG_NONE
};
static const char* const TOKEN_COOKIE_NAME = "webgate_token";
typedef struct ModuleGlobalConfig {
// Maximum amount of access tokens which module will keep track of
size_t tracked_token_count;
} ModuleGlobalConfig;
static ModuleGlobalConfig g_global_config;
// Context aware configuration
typedef struct ModuleContextConfig {
// Whether module is enabled in current context (for example directory)
bool enabled;
} ModuleContextConfig;
typedef struct TokenArray {
char* tokens;
size_t count;
} TokenArray;
static void token_array_init(TokenArray* self) {
self->tokens = calloc(TRACKED_TOKEN_COUNT, MAX_TOKEN_LENGTH);
memset(self->tokens, 0, TRACKED_TOKEN_COUNT*MAX_TOKEN_LENGTH);
self->tokens = calloc(g_global_config.tracked_token_count, MAX_TOKEN_LENGTH);
memset(self->tokens, 0, g_global_config.tracked_token_count*MAX_TOKEN_LENGTH);
self->count = 0;
}
static void token_array_push(TokenArray* self, const char* token) {
// Wrap around when array gets full
if(self->count>=g_global_config.tracked_token_count)
self->count = 0;
strncpy(&self->tokens[self->count*MAX_TOKEN_LENGTH], token, MAX_TOKEN_LENGTH);
self->count++;
// Wrap around when array gets full
if(self->count>=TRACKED_TOKEN_COUNT)
self->count = 0;
}
// Checks if token array contains token
@@ -61,14 +96,14 @@ static bool check_user_agent_exception(request_rec* r) {
}
static const char* generate_token(apr_pool_t* pool) {
char rnd[32];
unsigned char rnd[32];
apr_generate_random_bytes(rnd, sizeof(rnd));
char rnd_md5[APR_MD5_DIGESTSIZE];
unsigned char rnd_md5[APR_MD5_DIGESTSIZE];
apr_md5(rnd_md5, rnd, sizeof(rnd));
const apr_size_t encoded_size = apr_base64_encode_len(sizeof(rnd_md5));
char* output = apr_palloc(pool, encoded_size);
apr_base64_encode(output, rnd_md5, sizeof(rnd_md5));
apr_base64_encode(output, (char*)rnd_md5, sizeof(rnd_md5));
return output;
}
@@ -99,7 +134,7 @@ static void handle_challenge(request_rec* r) {
// Randomize options order
for(size_t i = 0; i<sizeof(option_order); i++) {
char swap_index;
unsigned char swap_index;
apr_generate_random_bytes(&swap_index, 1);
swap_index%=sizeof(option_order);
if(swap_index==0)
@@ -162,6 +197,10 @@ static apr_status_t post_config_hook(apr_pool_t* pool, apr_pool_t* pool_log, apr
}
static int request_check_handler(request_rec* r) {
// Check if module is enabled for current context
const ModuleContextConfig* config = (ModuleContextConfig*)ap_get_module_config(r->per_dir_config, &webgate_module);
if(!config->enabled)
return DECLINED;
// Provide exception for requests performed by Git
if(check_user_agent_exception(r))
return DECLINED;
@@ -200,16 +239,38 @@ static int request_check_handler(request_rec* r) {
}
static void register_hooks(apr_pool_t* pool) {
ap_hook_post_config(post_config_hook, NULL, NULL, APR_HOOK_FIRST);
// Initialize global config
g_global_config.tracked_token_count = 1000;
ap_hook_post_config(post_config_hook, NULL, NULL, APR_HOOK_LAST);
ap_hook_handler(request_check_handler, NULL, NULL, APR_HOOK_FIRST);
}
module AP_MODULE_DECLARE_DATA webgate_module = {
STANDARD20_MODULE_STUFF,
NULL,
NULL,
NULL,
NULL,
NULL,
register_hooks
};
static void* create_directory_configuration(apr_pool_t* pool, char* context) {
ModuleContextConfig* config = apr_palloc(pool, sizeof(ModuleContextConfig));
if(config)
config->enabled = false;
return config;
}
// Merges configuration of parent directory and subdirectory and produces new configuration
static void* merge_directory_configuration(apr_pool_t* pool, void* p_base, void* p_override) {
const ModuleContextConfig* base = (ModuleContextConfig*)p_base;
const ModuleContextConfig* override = (ModuleContextConfig*)p_override;
ModuleContextConfig* result = create_directory_configuration(pool, NULL);
if(result)
result->enabled = base->enabled || override->enabled;
return result;
}
static const char* global_config_set_tracked_token_count(cmd_parms* cmd, void* cfg, const char* count) {
g_global_config.tracked_token_count = atol(count);
return NULL;
}
static const char* context_config_set_enabled(cmd_parms* cmd, void* cfg, const char* enabled) {
if(!cfg)
return NULL;
ModuleContextConfig* config = (ModuleContextConfig*)cfg;
config->enabled = strcmp(enabled, "on")==0;
return NULL;
}