Block paths

src/OVAL/_oval_probe_session.h

@@ -45,6 +45,7 @@ struct oval_probe_session {
         struct oval_syschar_model *sys_model; /**< system characteristics model */
         char         *dir;  /**< probe session directory */
         uint32_t      flg;  /**< probe session flags */
+        struct oscap_stringlist *blocked_paths; /**< list of blocked paths */
 };
 
 #endif /* _OVAL_PROBE_SESSION */

src/OVAL/oval_agent.c

@@ -140,6 +140,11 @@ oval_agent_session_t * oval_agent_new_session(struct oval_definition_model *mode
 	return ag_sess;
 }
 
+void oval_agent_set_blocked_paths(oval_agent_session_t *ag_sess, struct oscap_stringlist *blocked_paths)
+{
+	oval_probe_session_set_blocked_paths(ag_sess->psess, blocked_paths);
+}
+
 struct oval_definition_model* oval_agent_get_definition_model(oval_agent_session_t* ag_sess)
 {
 	return ag_sess->def_model;

src/OVAL/oval_probe_ext.c

@@ -970,6 +970,7 @@ int oval_probe_ext_eval(SEAP_CTX_t *ctx, oval_pd_t *pd, oval_pext_t *pext, struc
 		oscap_seterr(OSCAP_EFAMILY_OVAL, "Internal error: syschar == NULL");
 		return (-1);
 	}
+	ctx->blocked_paths = oval_probe_session_get_blocked_paths(pext->sess_ptr);
 
 	object = oval_syschar_get_object(syschar);
 	ret = oval_object_to_sexp(pext->sess_ptr, oval_subtype_to_str(oval_object_get_subtype(object)), syschar, &s_obj);

src/OVAL/oval_probe_session.c

@@ -133,6 +133,7 @@ static void oval_probe_session_init(oval_probe_session_t *sess, struct oval_sysc
         sess->pext = oval_pext_new();
         sess->pext->model    = &sess->sys_model;
         sess->pext->sess_ptr = sess;
+	sess->blocked_paths = NULL;
 
         __init_once();
 
@@ -222,4 +223,15 @@ struct oval_syschar_model *oval_probe_session_getmodel(oval_probe_session_t *ses
 	return (sess->sys_model);
 }
 
+void oval_probe_session_set_blocked_paths(oval_probe_session_t *sess, struct oscap_stringlist *blocked_paths)
+{
+	sess->blocked_paths = blocked_paths;
+}
+
+struct oscap_stringlist *oval_probe_session_get_blocked_paths(oval_probe_session_t *sess)
+{
+	return sess->blocked_paths;
+}
+
+
 /// @}

src/OVAL/oval_session.c

@@ -85,6 +85,7 @@ struct oval_session {
 	bool fetch_remote_resources;
 	download_progress_calllback_t progress;
 	const char *local_files;
+	struct oscap_stringlist *blocked_paths;
 };
 
 struct oval_session *oval_session_new(const char *filename)
@@ -324,6 +325,7 @@ static int oval_session_setup_agent(struct oval_session *session)
 
 	char *base_name = oscap_basename(path_clone);
 	session->sess = oval_agent_new_session(session->def_model, base_name);
+	oval_agent_set_blocked_paths(session->sess, session->blocked_paths);
 	free(base_name);
 	if (session->sess == NULL) {
 		oscap_seterr(OSCAP_EFAMILY_OVAL, "Failed to create a new agent session.");

src/OVAL/probes/SEAP/_seap-types.h

@@ -58,6 +58,7 @@ struct SEAP_CTX {
         uint16_t recv_timeout;
         uint16_t send_timeout;
 	oval_subtype_t subtype;
+	struct oscap_stringlist *blocked_paths;
 };
 typedef struct SEAP_CTX SEAP_CTX_t;
 

src/OVAL/probes/SEAP/sch_queue.c

@@ -54,6 +54,7 @@ int sch_queue_connect(SEAP_desc_t *desc)
 	struct probe_common_main_argument *arg = malloc(sizeof(struct probe_common_main_argument));
 	arg->subtype = desc->subtype;
 	arg->queuedata = data;
+	arg->blocked_paths = desc->blocked_paths;
 	desc->arg = arg;
 
 	pthread_attr_t attr;

src/OVAL/probes/SEAP/seap-descriptor.h

@@ -60,6 +60,7 @@ typedef struct {
         SEAP_cmdtbl_t *cmd_w_table; /* Waiting SEAP commands */
     oval_subtype_t subtype;
 	struct probe_common_main_argument *arg;
+	struct oscap_stringlist *blocked_paths;
 } SEAP_desc_t;
 
 #define SEAP_DESC_FDIN  0x00000001

src/OVAL/probes/SEAP/seap.c

@@ -112,6 +112,7 @@ int SEAP_connect(SEAP_CTX_t *ctx)
                 return(-1);
         }
 	dsc->subtype = ctx->subtype;
+        dsc->blocked_paths = ctx->blocked_paths;
 
 	if (sch_queue_connect(dsc) != 0) {
                 dD("FAIL: errno=%u, %s.", errno, strerror (errno));

src/OVAL/probes/independent/textfilecontent54_probe.c

@@ -53,6 +53,8 @@
 #include "common/debug_priv.h"
 #include "common/util.h"
 #include "common/oscap_pcre.h"
+#include "common/list.h"
+
 #include "textfilecontent54_probe.h"
 
 #define FILE_SEPARATOR '/'
@@ -118,7 +120,7 @@ struct pfdata {
 	oscap_pcre_t *compiled_regex;
 };
 
-static int process_file(const char *prefix, const char *path, const char *file, struct pfdata *pfd, oval_schema_version_t over)
+static int process_file(const char *prefix, const char *path, const char *file, struct pfdata *pfd, oval_schema_version_t over, struct oscap_stringlist *blocked_paths)
 {
 	int ret = 0, path_len, file_len, cur_inst = 0, fd = -1, substr_cnt,
 		buf_size = 0, buf_used = 0, ofs = 0, buf_inc = 4096;
@@ -143,6 +145,9 @@ static int process_file(const char *prefix, const char *path, const char *file,
 
 	memcpy(whole_path + path_len, file, file_len + 1);
 
+	if (probe_path_is_blocked(whole_path, blocked_paths)) {
+		goto cleanup;
+	}
 	/*
 	 * If stat() fails, don't report an error and just skip the file.
 	 * This is an expected situation, because the fts_*() functions
@@ -357,7 +362,7 @@ int textfilecontent54_probe_main(probe_ctx *ctx, void *arg)
 			if (ofts_ent->fts_info == FTS_F
 			    || ofts_ent->fts_info == FTS_SL) {
 				// todo: handle return code
-				process_file(prefix, ofts_ent->path, ofts_ent->file, &pfd, over);
+				process_file(prefix, ofts_ent->path, ofts_ent->file, &pfd, over, ctx->blocked_paths);
 			}
 			oval_ftsent_free(ofts_ent);
 		}

src/OVAL/probes/probe-api.c

@@ -1794,4 +1794,54 @@ SEXP_t *probe_obj_getmask(SEXP_t *obj)
     SEXP_free(objents);
     return (mask);
 }
+
+static bool path_startswith(const char *path, const char *prefix)
+{
+	bool res = true;
+	const char *del = "/";
+	char *path_dup = oscap_strdup(path);
+	char **path_split = oscap_split(path_dup, del);
+	char *prefix_dup = oscap_strdup(prefix);
+	char **prefix_split = oscap_split(prefix_dup, del);
+	int i = 0, j = 0;
+	while (prefix_split[i] && path_split[j]) {
+		if (!strcmp(prefix_split[i], "")) {
+			++i;
+			continue;
+		}
+		if (!strcmp(path_split[j], "")) {
+			++j;
+			continue;
+		}
+		if (strcmp(prefix_split[i], path_split[j])) {
+			res = false;
+			break;
+		}
+		++i;
+		++j;
+	}
+	free(path_dup);
+	free(path_split);
+	free(prefix_dup);
+	free(prefix_split);
+	return res;
+}
+
+bool probe_path_is_blocked(const char *path, struct oscap_stringlist *blocked_paths)
+{
+	bool res = false;
+	printf("calling probe_path_is_blocked('%s')\n", path);
+	struct oscap_iterator *it = oscap_iterator_new(blocked_paths);
+	while (oscap_iterator_has_more(it)) {
+		const char *item = oscap_iterator_next(it);
+		if (path_startswith(path, item)) {
+			printf("Skipping '%s'\n", path);
+			res = true;
+			break;
+		}
+	}
+	oscap_iterator_free(it);
+	return res;
+}
+
 /// @}

src/OVAL/probes/probe/probe.h

@@ -75,6 +75,7 @@ typedef struct {
 
 	int real_root_fd;
 	int real_cwd_fd;
+	struct oscap_stringlist *blocked_paths;
 } probe_t;
 
 struct probe_ctx {
@@ -84,6 +85,7 @@ struct probe_ctx {
         probe_icache_t *icache;    /**< item cache */
 	int offline_mode;
 	double max_mem_ratio;
+	struct oscap_stringlist *blocked_paths;
 };
 
 typedef enum {

src/OVAL/probes/probe/probe_main.c

@@ -180,6 +180,7 @@ void *probe_common_main(void *arg)
 	probe.subtype = subtype;
 	probe.real_root_fd = -1;
 	probe.real_cwd_fd = -1;
+	probe.blocked_paths = probe_argument->blocked_paths;
 
 #if defined(HAVE_PTHREAD_SETNAME_NP)
 # if defined(OS_APPLE)

src/OVAL/probes/probe/probe_main.h

@@ -26,6 +26,7 @@
 struct probe_common_main_argument {
 	oval_subtype_t subtype;
 	sch_queuedata_t *queuedata;
+	struct oscap_stringlist *blocked_paths;
 };
 void *probe_common_main(void *);
 

src/OVAL/probes/probe/worker.c

@@ -1078,6 +1078,7 @@ SEXP_t *probe_worker(probe_t *probe, SEAP_msg_t *msg_in, int *ret)
 			if (max_ratio > 0)
 				pctx.max_mem_ratio = max_ratio;
 		}
+		pctx.blocked_paths = probe->blocked_paths;
 
 		/* simple object */
                 pctx.icache  = probe->icache;

src/OVAL/probes/public/probe-api.h

@@ -68,6 +68,7 @@
 #include <oval_types.h>
 #include "sexp-types.h"
 #include "oscap_export.h"
+#include "list.h"
 
 /*
  * items
@@ -538,4 +539,11 @@ OSCAP_API oval_schema_version_t probe_obj_get_platform_schema_version(const SEXP
  */
 OSCAP_API SEXP_t *probe_obj_getmask(SEXP_t *obj);
 
+/**
+ * Check if the given path matches any of the paths in the blocked paths list
+ * @param path path to be examined
+ * @param blocked_paths list of blocked paths
+ */
+OSCAP_API bool probe_path_is_blocked(const char *path, struct oscap_stringlist *blocked_paths);
+
 /// @}

src/OVAL/probes/unix/file_probe.c

@@ -304,7 +304,7 @@ static SEXP_t *has_extended_acl(const char *path)
 #endif
 }
 
-static int file_cb(const char *prefix, const char *p, const char *f, void *ptr, oval_schema_version_t over, struct ID_cache *cache, struct gr_sexps *grs, SEXP_t *gr_lastpath)
+static int file_cb(const char *prefix, const char *p, const char *f, void *ptr, oval_schema_version_t over, struct ID_cache *cache, struct gr_sexps *grs, SEXP_t *gr_lastpath, struct oscap_stringlist *blocked_paths)
 {
         char path_buffer[PATH_MAX];
         SEXP_t *item;
@@ -325,6 +325,10 @@ static int file_cb(const char *prefix, const char *p, const char *f, void *ptr,
 		st_path = path_buffer;
 	}
 
+	if (probe_path_is_blocked(st_path, blocked_paths)) {
+		return 0;
+	}
+
 	char *st_path_with_prefix = oscap_path_join(prefix, st_path);
 	if (lstat(st_path_with_prefix, &st) == -1) {
                 dD("lstat failed when processing %s: errno=%u, %s.", st_path, errno, strerror (errno));
@@ -509,7 +513,7 @@ int file_probe_main(probe_ctx *ctx, void *mutex)
 
 	if ((ofts = oval_fts_open_prefixed(prefix, path, filename, filepath, behaviors, probe_ctx_getresult(ctx))) != NULL) {
 		while ((ofts_ent = oval_fts_read(ofts)) != NULL) {
-			if (file_cb(prefix, ofts_ent->path, ofts_ent->file, &cbargs, over, cache, grs, &gr_lastpath) != 0) {
+			if (file_cb(prefix, ofts_ent->path, ofts_ent->file, &cbargs, over, cache, grs, &gr_lastpath, ctx->blocked_paths) != 0) {
 				oval_ftsent_free(ofts_ent);
 				break;
 			}

src/OVAL/public/oval_agent_api.h

@@ -42,6 +42,7 @@
 #include "oval_results.h"
 #include "oval_variables.h"
 #include "oscap_export.h"
+#include "list.h"
 //#include "oval_probe.h"
 
 struct oval_agent_session;
@@ -73,6 +74,13 @@ OSCAP_API struct oval_definition_model* oval_agent_get_definition_model(oval_age
  */
 OSCAP_API void oval_agent_set_product_name(oval_agent_session_t *, char *);
 
+/**
+ * Block certain paths during content evaluation
+ * @param ag_sess OVAL agent session
+ * @param blocked_paths a list of filesystem paths that will be skipped
+ */
+OSCAP_API void oval_agent_set_blocked_paths(oval_agent_session_t *, struct oscap_stringlist *);
+
 /**
  * Probe the system and evaluate specified definition
  * @return 0 on success; -1 error; 1 warning

src/OVAL/public/oval_probe_session.h

@@ -34,6 +34,7 @@ typedef struct oval_probe_session oval_probe_session_t;
 
 #include "oval_system_characteristics.h"
 #include "oscap_export.h"
+#include "list.h"
 
 /**
  * Create and initialize a new probe session
@@ -74,5 +75,18 @@ OSCAP_API int oval_probe_session_abort(oval_probe_session_t *sess);
  */
 OSCAP_API struct oval_syschar_model *oval_probe_session_getmodel(oval_probe_session_t *sess);
 
+/**
+ * Block certain paths during content evaluation
+ * @param sess pointer to the probe session structure
+ * @param blocked_paths a list of filesystem paths that will be skipped
+ */
+OSCAP_API void oval_probe_session_set_blocked_paths(oval_probe_session_t *sess, struct oscap_stringlist *blocked_paths);
+
+/**
+ * Retrieve a list of filesystem paths that will be skipped during content evaluation
+ * @param sess pointer to the probe session structure
+ */
+OSCAP_API struct oscap_stringlist *oval_probe_session_get_blocked_paths(oval_probe_session_t *sess);
+
 #endif /* OVAL_PROBE_SESSION */
 /// @}

src/XCCDF/public/xccdf_session.h

@@ -35,6 +35,7 @@
 #include "xccdf_policy.h"
 #include "oscap_download_cb.h"
 #include "oscap_export.h"
+#include "list.h"
 
 /**
  * @struct xccdf_session
@@ -644,6 +645,13 @@ OSCAP_API int xccdf_session_generate_guide(struct xccdf_session *session, const
  */
 OSCAP_API int xccdf_session_export_all(struct xccdf_session *session);
 
+/**
+ * Block certain paths during content evaluation
+ * @param session pointer to XCCDF session
+ * @param blocked_paths a list of filesystem paths that will be skipped
+ */
+OSCAP_API void xccdf_session_set_blocked_paths(struct xccdf_session *session, struct oscap_stringlist *blocked_paths);
+
 /// @}
 /// @}
 #endif

src/XCCDF/xccdf_session.c

@@ -99,6 +99,7 @@ struct xccdf_session {
 		struct oscap_htable *result_sources;    ///< mapping 'filepath' to oscap_source for OVAL results
 		struct oscap_htable *results_mapping;    ///< mapping OVAL filename to filepath for OVAL results
 		struct oscap_htable *arf_report_mapping;    ///< mapping OVAL filename to ARF report ID for OVAL results
+		struct oscap_stringlist *blocked_paths;    ///< a list of filesystem paths that will be skipped during content evaluation
 	} oval;
 	struct {
 		char *arf_file;				///< Path to ARF file to export
@@ -1210,6 +1211,7 @@ int xccdf_session_load_oval(struct xccdf_session *session)
 
 		/* def_model -> session */
 		struct oval_agent_session *tmp_sess = oval_agent_new_session(tmp_def_model, contents[idx]->href);
+		oval_agent_set_blocked_paths(tmp_sess, session->oval.blocked_paths);
 		if (tmp_sess == NULL) {
 			oscap_seterr(OSCAP_EFAMILY_OSCAP, "Failed to create new OVAL agent session for: '%s'.", contents[idx]->href);
 			oval_definition_model_free(tmp_def_model);
@@ -2059,3 +2061,8 @@ int xccdf_session_export_all(struct xccdf_session *session)
 	oscap_source_free(arf_source);
 	return ret;
 }
+
+void xccdf_session_set_blocked_paths(struct xccdf_session *session, struct oscap_stringlist *blocked_paths)
+{
+	session->oval.blocked_paths = blocked_paths;
+}

utils/oscap-tool.c

@@ -62,6 +62,7 @@ static void oscap_action_init(struct oscap_action *action)
     action->validate_signature = 1;
     action->rules = oscap_stringlist_new();
     action->skip_rules = oscap_stringlist_new();
+    action->blocked_paths = oscap_stringlist_new();
 }
 
 static void oscap_action_release(struct oscap_action *action)

utils/oscap-tool.h

@@ -176,6 +176,7 @@ struct oscap_action {
 	char *verbosity_level;
 	char *fix_type;
 	char *local_files;
+	struct oscap_stringlist *blocked_paths;
 };
 
 int app_xslt(const char *infile, const char *xsltfile, const char *outfile, const char **params);