Allow sandboxing plugin instances

http_server.c

@@ -76,11 +76,11 @@ void destroy_config()
         freedict(server_config.mimes);
     if (server_config.stat_fifo_path)
         free(server_config.stat_fifo_path);
-    if(server_config.plugins)
+    if (server_config.plugins)
     {
         for_each_assoc(it, server_config.plugins)
         {
-            freedict((dictionary_t) it->value);
+            freedict((dictionary_t)it->value);
         }
         freedict(server_config.plugins);
     }
@@ -94,7 +94,7 @@ void destroy_config()
             {
                 if (cnf->htdocs != NULL)
                     free(cnf->htdocs);
-                if(cnf->plugins)
+                if (cnf->plugins)
                     free(cnf->plugins);
                 if (cnf->sock > 0)
                 {
@@ -114,7 +114,7 @@ static int config_handler(void *conf, const char *section, const char *name,
     config_t *pconfig = (config_t *)conf;
     regmatch_t regex_matches[2];
     char buf[255];
-    char * tmp;
+    char *tmp;
     struct stat st;
     // trim(section, ' ');
     // trim(value,' ');
@@ -125,7 +125,7 @@ static int config_handler(void *conf, const char *section, const char *name,
         if (stat(value, &st) == -1)
             mkdirp(value, 0755);
         tmp = realpath(value, NULL);
-        if(!tmp)
+        if (!tmp)
         {
             ERROR("Unable to query real path for %s: %s", value, strerror(errno));
         }
@@ -148,7 +148,7 @@ static int config_handler(void *conf, const char *section, const char *name,
         if (stat(value, &st) == -1)
             mkdirp(value, 0700);
         tmp = realpath(value, NULL);
-        if(!tmp)
+        if (!tmp)
         {
             ERROR("Unable to query real path for %s: %s", value, strerror(errno));
         }
@@ -171,7 +171,7 @@ static int config_handler(void *conf, const char *section, const char *name,
             removeAll(value, 0);
         }
         tmp = realpath(value, NULL);
-        if(!tmp)
+        if (!tmp)
         {
             ERROR("Unable to query real path for %s: %s", value, strerror(errno));
         }
@@ -270,7 +270,7 @@ static int config_handler(void *conf, const char *section, const char *name,
                 mkdirp(value, 0755);
             }
             p->htdocs = realpath(value, NULL);
-            if(!p->htdocs)
+            if (!p->htdocs)
             {
                 ERROR("Unable to query real path for %s: %s", value, strerror(errno));
                 p->htdocs = strdup(value);
@@ -280,7 +280,7 @@ static int config_handler(void *conf, const char *section, const char *name,
                 LOG("Server root is %s", p->htdocs);
             }
         }
-        else if(strcmp(name, "plugins") == 0)
+        else if (strcmp(name, "plugins") == 0)
         {
             p->plugins = strdup(value);
         }
@@ -320,34 +320,34 @@ static void init_plugins()
 {
     chain_t it, it2;
     dictionary_t config;
-    const char* value;
+    const char *value;
     for_each_assoc(it, server_config.plugins)
     {
-        config = (dictionary_t) it -> value;
-        if(config)
+        config = (dictionary_t)it->value;
+        if (config)
         {
             for_each_assoc(it2, config)
             {
-                LOG("Plugin %s: [%s] -> [%s]", it->key, it2->key, (char*) it2->value);
-                if(strncmp(it2->key, "file_type", 9) == 0 && it2->value)
+                LOG("Plugin %s: [%s] -> [%s]", it->key, it2->key, (char *)it2->value);
+                if (strncmp(it2->key, "file_type", 9) == 0 && it2->value)
                 {
-                    char* file_type = strdup((char*) it2->value);
-                    char* token;
+                    char *file_type = strdup((char *)it2->value);
+                    char *token;
                     char *stringp = file_type;
-                    while((token = strsep(&stringp,",")))
+                    while ((token = strsep(&stringp, ",")))
                     {
                         trim(token, ' ');
-                        if(strlen(token) > 0) 
+                        if (strlen(token) > 0)
                         {
-                            dput(server_config.handlers,token, strdup((char*)it->key));
+                            dput(server_config.handlers, token, strdup((char *)it->key));
                             LOG("Plugin %s: support %s file", it->key, token);
                         }
                     }
                     free(file_type);
                 }
             }
-            value = (char*)dvalue(config,"autoload");
-            if( value && (strncmp(value,"1", 1) == 0  || strncmp(value, "true", 3) == 0 ) )
+            value = (char *)dvalue(config, "autoload");
+            if (value && (strncmp(value, "1", 1) == 0 || strncmp(value, "true", 3) == 0))
             {
                 // load the plugin
                 LOG("Plugin %s: autoloading...", it->key);
@@ -532,8 +532,7 @@ void *resolve_request(void *data)
     char *rqp = NULL;
     char *oldrqp = NULL;
     rq->client->state = ANTD_CLIENT_RESOLVE_REQUEST;
-    htdocs(rq, path);
-    strcat(path, url);
+    snprintf(path, sizeof(path), "%s/%s", (char *)dvalue(rq->request, "SERVER_WWW_ROOT"), url);
     LOG("URL is : %s", url);
     LOG("Resource Path is : %s", path);
     // if (path[strlen(path) - 1] == '/')
@@ -567,8 +566,7 @@ void *resolve_request(void *data)
                 {
                     newurl = __s("%s/index.%s", url, it->key);
                     memset(path, 0, sizeof(path));
-                    htdocs(rq, path);
-                    strcat(path, newurl);
+                    snprintf(path, sizeof(path), "%s/%s", (char *)dvalue(rq->request, "SERVER_WWW_ROOT"), newurl);
                     if (stat(path, &st) != 0)
                     {
                         free(newurl);
@@ -669,7 +667,7 @@ int rule_check(const char *k, const char *v, const char *host, const char *_url,
     char *tmp, rep[10];
     int idx = 0;
     memset(rep, 0, 10);
-    LOG("Verify %s=%s on %s or %s", k, v , url, host);
+    LOG("Verify %s=%s on %s or %s", k, v, url, host);
     // 1 group
     if (!host || !(ret = regex_match(k, host, 10, key_matches)))
     {
@@ -863,11 +861,11 @@ char *apply_rules(dictionary_t rules, const char *host, char *url)
     for_each_assoc(it, rules)
     {
         k = it->key;
-        if(it->value)
+        if (it->value)
         {
             v = (char *)it->value;
             // 1 group
-            if (regex_match("<break>$",v, 0, NULL))
+            if (regex_match("<break>$", v, 0, NULL))
             {
                 should_break = 1;
             }
@@ -882,7 +880,7 @@ char *apply_rules(dictionary_t rules, const char *host, char *url)
                     *query_string = '\0';
                     query_string++;
                 }
-                if(should_break)
+                if (should_break)
                 {
                     i = rules->cap;
                     LOG("Break rule check as matched found at %s -> %s", k, v);
@@ -1718,7 +1716,7 @@ void *execute_plugin(void *data, const char *pname)
     port_config_t *pcnf = (port_config_t *)dvalue(server_config.ports, port_s);
 
     // check if plugin is enabled on this port
-    if(!pcnf->plugins || !regex_match(pattern, pcnf->plugins , 0,NULL))
+    if (!pcnf->plugins || !regex_match(pattern, pcnf->plugins, 0, NULL))
     {
         LOG("No plugin matched in [%s] using pattern [%s]", pcnf->plugins, pattern);
         antd_error(rq->client, 403, "Access forbidden");
@@ -1768,19 +1766,6 @@ dictionary_t mimes_list()
     return server_config.mimes;
 }
 
-void dbdir(char **dest)
-{
-    *dest = server_config.db_path;
-}
-void tmpdir(char **dest)
-{
-    *dest = server_config.tmpdir;
-}
-void plugindir(char **dest)
-{
-    *dest =server_config.plugins_dir;
-}
-
 #ifdef USE_ZLIB
 int compressable(char *ctype)
 {

httpd.c

@@ -56,7 +56,7 @@ static SSL_CTX *create_context()
 }
 #if OPENSSL_VERSION_NUMBER >= 0x10002000L
 static unsigned char antd_protocols[] = {
-	//TODO: add support to HTTP/2 protocol: 2,'h', '2',
+    // TODO: add support to HTTP/2 protocol: 2,'h', '2',
     8, 'h', 't', 't', 'p', '/', '1', '.', '1'};
 static int alpn_advertise_protos_cb(SSL *ssl, const unsigned char **out, unsigned int *outlen, void *arg)
 {
@@ -88,7 +88,7 @@ static void configure_context(SSL_CTX *ctx)
 #else
     SSL_CTX_set_tmp_ecdh(ctx, EC_KEY_new_by_curve_name(NID_X9_62_prime256v1));
 #endif
-	//SSL_CTX_set_ecdh_auto(ctx, 1);
+    // SSL_CTX_set_ecdh_auto(ctx, 1);
     /* Set some options and the session id.
      * SSL_OP_NO_SSLv2: SSLv2 is insecure, disable it.
      * SSL_OP_NO_TICKET: We don't want TLS tickets used because this is an SSL server caching example.
@@ -108,7 +108,7 @@ static void configure_context(SSL_CTX *ctx)
     }
     /* Set the key and cert */
     /* use the full chain bundle of certificate */
-	//if (SSL_CTX_use_certificate_file(ctx, server_config->sslcert, SSL_FILETYPE_PEM) <= 0) {
+    // if (SSL_CTX_use_certificate_file(ctx, server_config->sslcert, SSL_FILETYPE_PEM) <= 0) {
     if (SSL_CTX_use_certificate_chain_file(ctx, cnf->sslcert) <= 0)
     {
         ERROR("Fail to read SSL certificate chain file: %s", cnf->sslcert);
@@ -143,7 +143,7 @@ static void stop_serve(int dummy)
     closelog();
     sigset_t mask;
     sigemptyset(&mask);
-	//Blocks the SIG_IGN signal (by adding SIG_IGN to newMask)
+    // Blocks the SIG_IGN signal (by adding SIG_IGN to newMask)
     sigaddset(&mask, SIGINT);
     sigaddset(&mask, SIGPIPE);
     sigaddset(&mask, SIGABRT);
@@ -201,7 +201,7 @@ static void antd_monitor(port_config_t *pcnf)
                 LOG("Connect to client IP: %s on port:%d (%d)", client_ip, pcnf->port, client_sock);
                 // ip address
                 dput(request->request, "REMOTE_ADDR", (void *)strdup(client_ip));
-				//LOG("socket: %d\n", client_sock);
+                // LOG("socket: %d\n", client_sock);
             }
 
             // set timeout to socket
@@ -338,7 +338,7 @@ int main(int argc, char *argv[])
     else
         load_config(argv[1]);
     // ignore the broken PIPE error when writing
-	//or reading to/from a closed socked connection
+    // or reading to/from a closed socked connection
     signal(SIGPIPE, SIG_IGN);
     signal(SIGABRT, SIG_IGN);
     signal(SIGINT, stop_serve);
@@ -418,7 +418,7 @@ int main(int argc, char *argv[])
     {
         if (conf->connection > conf->maxcon)
         {
-			//ERROR("Reach max connection %d", conf->connection);
+            // ERROR("Reach max connection %d", conf->connection);
             timeout.tv_sec = 0;
             timeout.tv_usec = 10000; // 5 ms
             select(0, NULL, NULL, NULL, &timeout);

lib/handle.c

@@ -106,28 +106,6 @@ int compressable(char *ctype)
     return 0;
 }
 
-void htdocs(antd_request_t *rq, char *dest)
-{
-    //dictionary_t xheader = (dictionary_t)dvalue(rq->request, "REQUEST_HEADER");
-    char *www = (char *)dvalue(rq->request, "SERVER_WWW_ROOT");
-    if (www)
-    {
-        strcpy(dest, www);
-    }
-}
-void dbdir(char **dest)
-{
-    UNUSED(dest);
-}
-void tmpdir(char **dest)
-{
-    UNUSED(dest);
-}
-void plugindir(char **dest)
-{
-    UNUSED(dest);
-}
-
 const char *get_status_str(int stat)
 {
     switch (stat)

lib/handle.h

@@ -30,6 +30,8 @@
 
 #define ANTD_PLUGIN_READY 0x0
 #define ANTD_PLUGIN_PANNIC 0x1
+#define ANTD_PLUGIN_INIT 0x2
+#define MAX_PATH_LEN 256
 
 typedef enum
 {
@@ -108,26 +110,22 @@ typedef struct
 
 typedef struct
 {
-    char name[128];
-    char* dbpath;
-    char* tmpdir;
-    char* pdir;
+    char name[MAX_PATH_LEN];
+    char dbpath[MAX_PATH_LEN];
+    char tmpdir[MAX_PATH_LEN];
+    char pdir[MAX_PATH_LEN];
     dictionary_t config;
     int raw_body;
     int status;
 } plugin_header_t;
 
-int __attribute__((weak)) require_plugin(const char *);
-void __attribute__((weak)) htdocs(antd_request_t *rq, char *dest);
-void __attribute__((weak)) dbdir(char **dest);
-void __attribute__((weak)) tmpdir(char **dest);
-void __attribute__((weak)) plugindir(char **dest);
 
-int __attribute__((weak)) compressable(char *ctype);
 
 void set_nonblock(int socket);
 //void set_block(int socket);
 
+int __attribute__((weak)) compressable(char *ctype);
+
 void antd_send_header(void *, antd_response_header_t *);
 const char *get_status_str(int stat);
 int __t(void *, const char *, ...);

lib/plugin.h

@@ -40,13 +40,8 @@ STATIC PART, should be included in any plugin
 
 static plugin_header_t __plugin__;
 // private function
-void __init_plugin__(const char* pl, dictionary_t* conf){
-	strcpy(__plugin__.name,pl);
-	dbdir(&__plugin__.dbpath);
-	plugindir(&__plugin__.pdir);
-	tmpdir(&__plugin__.tmpdir); 
-	__plugin__.config = conf;
-	__plugin__.raw_body = 0;
+void __init_plugin__(plugin_header_t* pl, dictionary_t* conf){
+	(void) memcpy(&__plugin__, pl, sizeof(plugin_header_t));
 	__plugin__.status = ANTD_PLUGIN_READY;
 	init();
 }; 

plugin_manager.c

@@ -1,12 +1,15 @@
 #include <dlfcn.h>
 #include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/sendfile.h>
+#include <unistd.h>
 #include "plugin_manager.h"
 #include "lib/utils.h"
 #include "lib/handle.h"
 #include "http_server.h"
-
-static void unload_plugin_by_name(const char*);
-static void * plugin_from_file(char* name, dictionary_t conf);
+static void unload_plugin_by_name(const char *);
+static void *plugin_from_file(char *name, char *path, dictionary_t conf);
 
 /**
  * Plugin table to store the loaded plugin
@@ -27,12 +30,6 @@ struct plugin_entry *plugin_lookup(char *s)
     return NULL;       /* not found */
 }
 
-int require_plugin(const char* name)
-{
-	struct plugin_entry* ptr = plugin_load((char*)name, NULL);
-	return ptr != NULL;
-}
-
 /**
  * Load a plugin to the plugin table
  * Only load when not available in the plugin table
@@ -40,41 +37,88 @@ int require_plugin(const char* name)
  * @param config: plugin configuration
  * @return      pointer to the loaded plugin
  */
-struct plugin_entry *plugin_load(char *name, dictionary_t config)
+struct plugin_entry *plugin_load(char *name, dictionary_t pconf)
 {
-	char* pname = NULL;
+    char *pname = NULL;
+    char path[BUFFLEN];
     struct plugin_entry *np;
     unsigned hashval;
     plugin_header_t *(*metafn)();
     plugin_header_t *meta = NULL;
-	char* error;
-	if(config)
+    config_t *sconf = config();
+    int fromfd, tofd;
+    char *error;
+    struct stat st;
+    int is_tmp = 0;
+    if (pconf)
     {
-		pname = dvalue(config, "name");
+        pname = dvalue(pconf, "name");
     }
-	if(!pname)
-	{
-		pname = name;
-	}
-    if ((np = plugin_lookup(name)) == NULL) { /* not found */
-		LOG("Loading plugin: %s -> %s", name, pname);
-        np = (struct plugin_entry *) malloc(sizeof(*np));
+    if ((np = plugin_lookup(name)) == NULL)
+    { /* not found */
+        LOG("Loading plugin: %s...", name);
+        np = (struct plugin_entry *)malloc(sizeof(*np));
         if (np == NULL || name == NULL)
         {
-			if(np) free(np);
+            if (np)
+                free(np);
             return NULL;
         }
-		np->pname = strdup(name);
-        if ((np->handle = plugin_from_file(pname,config)) == NULL)
+
+        (void)snprintf(path, sizeof(path), "%s/%s%s", sconf->plugins_dir, name, sconf->plugins_ext);
+        if (pname && strcmp(name, pname) != 0)
         {
-			if(np->pname) free(np->pname);
-			if(np) free(np);
+            // copy plugin file to tmpdir
+            (void)snprintf(path, sizeof(path), "%s/%s%s", sconf->plugins_dir, pname, sconf->plugins_ext);
+            LOG("Original plugin file: %s", path);
+            if ((fromfd = open(path, O_RDONLY)) < 0)
+            {
+                ERROR("Unable to open file for reading %s: %s", path, strerror(errno));
                 return NULL;
             }
-		hashval = hash(name,HASHSIZE);
+            if (stat(path, &st) != 0)
+            {
+                close(fromfd);
+                ERROR("Unable to get file stat %s: %s", path, strerror(errno));
+                return NULL;
+            }
+            (void)snprintf(path, sizeof(path), "%s/%s%s", sconf->tmpdir, name, sconf->plugins_ext);
+            LOG("TMP plugin file: %s", path);
+            if ((tofd = open(path, O_WRONLY | O_CREAT, 0600)) < 0)
+            {
+                close(fromfd);
+                ERROR("Unable open file for reading %s: %s", path, strerror(errno));
+                return NULL;
+            }
+            if (sendfile(tofd, fromfd, NULL, st.st_size) != st.st_size)
+            {
+                close(fromfd);
+                close(tofd);
+                ERROR("Unable to copy file: %s", strerror(errno));
+                return NULL;
+            }
+            is_tmp = 1;
+        }
+
+        np->pname = strdup(name);
+        np->handle = plugin_from_file(name, path, pconf);
+        if (is_tmp)
+        {
+            (void)remove(path);
+        }
+        if (np->handle == NULL)
+        {
+            if (np->pname)
+                free(np->pname);
+            if (np)
+                free(np);
+            return NULL;
+        }
+        hashval = hash(name, HASHSIZE);
         np->next = plugin_table[hashval];
         plugin_table[hashval] = np;
-    } else /* already there */
+    }
+    else /* already there */
     {
         LOG("The plugin %s id already loaded", name);
     }
@@ -90,7 +134,7 @@ struct plugin_entry *plugin_load(char *name, dictionary_t config)
     }
     meta = metafn();
     LOG("PLugin status: [%s] %d", name, meta->status);
-	if(!meta || meta->status != ANTD_PLUGIN_READY)
+    if (!meta || meta->status != ANTD_PLUGIN_READY)
     {
         ERROR("Plugin is not ready or error: [%s].", name);
         unload_plugin_by_name(name);
@@ -104,73 +148,81 @@ struct plugin_entry *plugin_load(char *name, dictionary_t config)
  * @param  name Name of the plugin
  * @return
  */
-static void * plugin_from_file(char* name, dictionary_t conf)
+static void *plugin_from_file(char *name, char *path, dictionary_t conf)
 {
     void *lib_handle;
-  char* error;
-  char* path = __s("%s/%s%s",config()->plugins_dir,name,config()->plugins_ext);
-  void (*fn)(const char*, dictionary_t);
-   lib_handle = dlopen(path, RTLD_LAZY);
+    char *error;
+    config_t *cnf = config();
+    void (*fn)(plugin_header_t *, dictionary_t);
+    lib_handle = dlopen(path, RTLD_LAZY | RTLD_LOCAL /*| RTLD_NODELETE*/);
     if (!lib_handle)
     {
-      ERROR("Cannot load plugin '%s' : '%s'",name,dlerror());
-	  if(path)
-		free(path);
+        ERROR("Cannot load plugin '%s' : '%s'", name, dlerror());
         return NULL;
     }
     // set database path
-   fn = (void (*)(const char*, dictionary_t))dlsym(lib_handle, "__init_plugin__");
+    fn = (void (*)(plugin_header_t *, dictionary_t))dlsym(lib_handle, "__init_plugin__");
     if ((error = dlerror()) != NULL)
-  		ERROR("Problem when finding plugin init function for %s : %s", name,error);
+        ERROR("Problem when finding plugin init function for %s : %s", name, error);
     else
-	(*fn)(name, conf); 
-  if(path)
-	free(path);
+    {
+        plugin_header_t header;
+        strncpy(header.name, name, MAX_PATH_LEN - 1);
+        strncpy(header.dbpath, cnf->db_path, MAX_PATH_LEN - 1);
+        strncpy(header.tmpdir, cnf->tmpdir, MAX_PATH_LEN - 1);
+        strncpy(header.pdir, cnf->plugins_dir, MAX_PATH_LEN - 1);
+        header.config = conf;
+        header.raw_body = 0;
+        header.status = ANTD_PLUGIN_INIT;
+        (*fn)(&header, conf);
+    }
+    // trick libc that we close this lib, but it is not realy deleted
     return lib_handle;
 }
 
-void unload_plugin(struct plugin_entry* np)
+void unload_plugin(struct plugin_entry *np)
 {
-	char* error;
+    char *error;
     void (*fn)() = NULL;
     // find and execute the exit function
-	fn = (void(*)()) dlsym(np->handle, "__release__");
+    fn = (void (*)())dlsym(np->handle, "__release__");
     if ((error = dlerror()) != NULL)
     {
-     	ERROR("Cant not release plugin %s : %s", np->pname,error);
+        ERROR("Cant not release plugin %s : %s", np->pname, error);
     }
-	if(fn)
+    if (fn)
     {
         (*fn)();
     }
     dlclose(np->handle);
-	//free((void *) np->handle);
-	if(np->pname)
-		free((void *) np->pname);
+    // free((void *) np->handle);
+    if (np->pname)
+        free((void *)np->pname);
 }
 /*
     Unload a plugin by its name
 */
-void unload_plugin_by_name(const char* name)
+void unload_plugin_by_name(const char *name)
 {
     struct plugin_entry *np;
     int hasval = hash(name, HASHSIZE);
     np = plugin_table[hasval];
-	if(strcmp(np->pname,name) == 0)
+    if (strcmp(np->pname, name) == 0)
     {
         unload_plugin(np);
         plugin_table[hasval] = np->next;
     }
     else
     {
-	    for (np = plugin_table[hasval] ; np != NULL; np = np->next)
+        for (np = plugin_table[hasval]; np != NULL; np = np->next)
         {
             if (np->next != NULL && strcmp(name, np->next->pname) == 0)
             {
                 break;
             }
         }
-		if(np == NULL) return; // the plugin is is not loaded
+        if (np == NULL)
+            return; // the plugin is is not loaded
         unload_plugin(np->next);
         np->next = np->next->next;
     }
@@ -181,12 +233,12 @@ void unload_plugin_by_name(const char* name)
 void unload_all_plugin()
 {
     LOG("Unload all plugins");
-	for(int i=0;i<HASHSIZE;i++)
+    for (int i = 0; i < HASHSIZE; i++)
     {
         struct plugin_entry **np, *curr;
         np = &plugin_table[i];
 
-		while((curr = *np) != NULL)
+        while ((curr = *np) != NULL)
         {
             (*np) = (*np)->next;
             unload_plugin(curr);
@@ -196,4 +248,3 @@ void unload_all_plugin()
     }
     exit(0);
 }
-