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-rw-r--r--libpam/pam_prelude.c454
1 files changed, 454 insertions, 0 deletions
diff --git a/libpam/pam_prelude.c b/libpam/pam_prelude.c
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+++ b/libpam/pam_prelude.c
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+/*
+ * pam_prelude.c -- prelude reporting
+ * http://www.prelude-ids.org
+ *
+ * (C) Sebastien Tricaud 2005 <toady@gscore.org>
+ */
+
+#include <stdio.h>
+#include <syslog.h>
+
+#ifdef PRELUDE
+
+#include <libprelude/prelude.h>
+#include <libprelude/prelude-log.h>
+#include <libprelude/idmef-message-print.h>
+
+#include "pam_prelude.h"
+#include "pam_private.h"
+
+
+#define ANALYZER_CLASS "pam"
+#define ANALYZER_MODEL "PAM"
+#define ANALYZER_MANUFACTURER "Sebastien Tricaud, http://www.kernel.org/pub/linux/libs/pam/"
+
+#define DEFAULT_ANALYZER_NAME "PAM"
+
+static const char *
+pam_get_item_service(const pam_handle_t *pamh)
+{
+ const void *service = NULL;
+
+ pam_get_item(pamh, PAM_SERVICE, &service);
+
+ return service;
+}
+
+static const char *
+pam_get_item_user(const pam_handle_t *pamh)
+{
+ const void *user = NULL;
+
+ pam_get_item(pamh, PAM_USER, &user);
+
+ return user;
+}
+
+static const char *
+pam_get_item_user_prompt(const pam_handle_t *pamh)
+{
+ const void *user_prompt = NULL;
+
+ pam_get_item(pamh, PAM_USER_PROMPT, &user_prompt);
+
+ return user_prompt;
+}
+
+static const char *
+pam_get_item_tty(const pam_handle_t *pamh)
+{
+ const void *tty = NULL;
+
+ pam_get_item(pamh, PAM_TTY, &tty);
+
+ return tty;
+}
+
+static const char *
+pam_get_item_ruser(const pam_handle_t *pamh)
+{
+ const void *ruser = NULL;
+
+ pam_get_item(pamh, PAM_RUSER, &ruser);
+
+ return ruser;
+}
+
+static const char *
+pam_get_item_rhost(const pam_handle_t *pamh)
+{
+ const void *rhost = NULL;
+
+ pam_get_item(pamh, PAM_RHOST, &rhost);
+
+ return rhost;
+}
+
+/* Courteously stolen from prelude-lml */
+static int
+generate_additional_data(idmef_alert_t *alert, const char *meaning,
+ const char *data)
+{
+ int ret;
+ prelude_string_t *str;
+ idmef_additional_data_t *adata;
+
+ ret = idmef_alert_new_additional_data(alert, &adata, -1);
+ if ( ret < 0 )
+ return ret;
+
+ ret = idmef_additional_data_new_meaning(adata, &str);
+ if ( ret < 0 )
+ return ret;
+
+ ret = prelude_string_set_ref(str, meaning);
+ if ( ret < 0 )
+ return ret;
+
+ return idmef_additional_data_set_string_ref(adata, data);
+}
+
+static int
+setup_analyzer(const pam_handle_t *pamh, idmef_analyzer_t *analyzer)
+{
+ int ret;
+ prelude_string_t *string;
+
+ ret = idmef_analyzer_new_model(analyzer, &string);
+ if ( ret < 0 )
+ goto err;
+ prelude_string_set_constant(string, ANALYZER_MODEL);
+
+ ret = idmef_analyzer_new_class(analyzer, &string);
+ if ( ret < 0 )
+ goto err;
+ prelude_string_set_constant(string, ANALYZER_CLASS);
+
+ ret = idmef_analyzer_new_manufacturer(analyzer, &string);
+ if ( ret < 0 )
+ goto err;
+ prelude_string_set_constant(string, ANALYZER_MANUFACTURER);
+
+ ret = idmef_analyzer_new_version(analyzer, &string);
+ if ( ret < 0 )
+ goto err;
+ prelude_string_set_constant(string, PAM_VERSION);
+
+
+ return 0;
+
+ err:
+ pam_syslog(pamh, LOG_WARNING,
+ "%s: IDMEF error: %s.\n",
+ prelude_strsource(ret), prelude_strerror(ret));
+
+ return -1;
+}
+
+static void
+pam_alert_prelude(const char *msg, void *data,
+ pam_handle_t *pamh, int authval)
+{
+ int ret;
+ idmef_time_t *clienttime;
+ idmef_alert_t *alert;
+ prelude_string_t *str;
+ idmef_message_t *idmef = NULL;
+ idmef_classification_t *class;
+ prelude_client_t *client = (prelude_client_t *)data;
+ idmef_source_t *source;
+ idmef_target_t *target;
+ idmef_user_t *user;
+ idmef_user_id_t *user_id;
+ idmef_process_t *process;
+ idmef_classification_t *classification;
+ idmef_impact_t *impact;
+ idmef_assessment_t *assessment;
+ idmef_node_t *node;
+ idmef_analyzer_t *analyzer;
+
+
+ ret = idmef_message_new(&idmef);
+ if ( ret < 0 )
+ goto err;
+
+ ret = idmef_message_new_alert(idmef, &alert);
+ if ( ret < 0 )
+ goto err;
+
+ ret = idmef_alert_new_classification(alert, &class);
+ if ( ret < 0 )
+ goto err;
+
+ ret = idmef_classification_new_text(class, &str);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_new_ref(&str, msg);
+ if ( ret < 0 )
+ goto err;
+
+ idmef_classification_set_text(class, str);
+
+ ret = idmef_time_new_from_gettimeofday(&clienttime);
+ if ( ret < 0 )
+ goto err;
+ idmef_alert_set_create_time(alert, clienttime);
+
+ idmef_alert_set_analyzer(alert,
+ idmef_analyzer_ref(prelude_client_get_analyzer(client)),
+ 0);
+
+ /**********
+ * SOURCE *
+ **********/
+ ret = idmef_alert_new_source(alert, &source, -1);
+ if ( ret < 0 )
+ goto err;
+
+ /* BEGIN: Sets the user doing authentication stuff */
+ ret = idmef_source_new_user(source, &user);
+ if ( ret < 0 )
+ goto err;
+ idmef_user_set_category(user, IDMEF_USER_CATEGORY_APPLICATION);
+
+ ret = idmef_user_new_user_id(user, &user_id, 0);
+ if ( ret < 0 )
+ goto err;
+ idmef_user_id_set_type(user_id, IDMEF_USER_ID_TYPE_ORIGINAL_USER);
+
+ if ( pam_get_item_ruser(pamh) ) {
+ ret = prelude_string_new(&str);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_set_ref(str, pam_get_item_ruser(pamh));
+ if ( ret < 0 )
+ goto err;
+
+ idmef_user_id_set_name(user_id, str);
+ }
+ /* END */
+ /* BEGIN: Adds TTY infos */
+ if ( pam_get_item_tty(pamh) ) {
+ ret = prelude_string_new(&str);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_set_ref(str, pam_get_item_tty(pamh));
+ if ( ret < 0 )
+ goto err;
+
+ idmef_user_id_set_tty(user_id, str);
+ }
+ /* END */
+ /* BEGIN: Sets the source node (rhost) */
+ ret = idmef_source_new_node(source, &node);
+ if ( ret < 0 )
+ goto err;
+ idmef_node_set_category(node, IDMEF_NODE_CATEGORY_HOSTS);
+
+ if ( pam_get_item_rhost(pamh) ) {
+ ret = prelude_string_new(&str);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_set_ref(str, pam_get_item_rhost(pamh));
+ if ( ret < 0 )
+ goto err;
+
+ idmef_node_set_name(node, str);
+ }
+ /* END */
+ /* BEGIN: Describe the service */
+ ret = idmef_source_new_process(source, &process);
+ if ( ret < 0 )
+ goto err;
+ idmef_process_set_pid(process, getpid());
+
+ if ( pam_get_item_service(pamh) ) {
+ ret = prelude_string_new(&str);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_set_ref(str, pam_get_item_service(pamh));
+ if ( ret < 0 )
+ goto err;
+
+ idmef_process_set_name(process, str);
+ }
+ /* END */
+
+ /**********
+ * TARGET *
+ **********/
+
+ ret = idmef_alert_new_target(alert, &target, -1);
+ if ( ret < 0 )
+ goto err;
+
+
+ /* BEGIN: Sets the target node */
+ analyzer = prelude_client_get_analyzer(client);
+ if ( ! analyzer ) goto err;
+
+ node = idmef_analyzer_get_node(analyzer);
+ if ( ! node ) goto err;
+ idmef_target_set_node(target, node);
+ node = idmef_node_ref(node);
+ if ( ! node ) goto err;
+ /* END */
+ /* BEGIN: Sets the user doing authentication stuff */
+ ret = idmef_target_new_user(target, &user);
+ if ( ret < 0 )
+ goto err;
+ idmef_user_set_category(user, IDMEF_USER_CATEGORY_APPLICATION);
+
+ ret = idmef_user_new_user_id(user, &user_id, 0);
+ if ( ret < 0 )
+ goto err;
+ idmef_user_id_set_type(user_id, IDMEF_USER_ID_TYPE_TARGET_USER);
+
+ if ( pam_get_item_user(pamh) ) {
+ ret = prelude_string_new(&str);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_set_ref(str, pam_get_item_user(pamh));
+ if ( ret < 0 )
+ goto err;
+
+ idmef_user_id_set_name(user_id, str);
+ }
+ /* END */
+ /* BEGIN: Short description of the alert */
+ ret = idmef_alert_new_classification(alert, &classification);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_new(&str);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_set_ref(str,
+ authval == PAM_SUCCESS ?
+ "Authentication Success" : "Authentication Failure");
+ if ( ret < 0 )
+ goto err;
+
+ idmef_classification_set_text(classification, str);
+ /* END */
+ /* BEGIN: Long description of the alert */
+ ret = idmef_alert_new_assessment(alert, &assessment);
+ if ( ret < 0 )
+ goto err;
+
+ ret = idmef_assessment_new_impact(assessment, &impact);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_new(&str);
+ if ( ret < 0 )
+ goto err;
+
+ ret = prelude_string_set_ref(str, pam_strerror (pamh, authval));
+ if ( ret < 0 )
+ goto err;
+
+ idmef_impact_set_description(impact, str);
+ /* END */
+ /* BEGIN: Adding additional data */
+ if ( pam_get_item_user_prompt(pamh) ) {
+ ret = generate_additional_data(alert, "Local User Prompt",
+ pam_get_item_user_prompt(pamh));
+ if ( ret < 0 )
+ goto err;
+ }
+ /* END */
+
+ prelude_client_send_idmef(client, idmef);
+
+ if ( idmef )
+ idmef_message_destroy(idmef);
+
+ return;
+ err:
+ pam_syslog(pamh, LOG_WARNING, "%s: IDMEF error: %s.\n",
+ prelude_strsource(ret), prelude_strerror(ret));
+
+ if ( idmef )
+ idmef_message_destroy(idmef);
+
+}
+
+static int
+pam_alert_prelude_init(pam_handle_t *pamh, int authval)
+{
+
+ int ret;
+ prelude_client_t *client = NULL;
+
+ ret = prelude_init(NULL, NULL);
+ if ( ret < 0 ) {
+ pam_syslog(pamh, LOG_WARNING,
+ "%s: Unable to initialize the Prelude library: %s.\n",
+ prelude_strsource(ret), prelude_strerror(ret));
+ return -1;
+ }
+
+ ret = prelude_client_new(&client, DEFAULT_ANALYZER_NAME);
+ if ( ! client ) {
+ pam_syslog(pamh, LOG_WARNING,
+ "%s: Unable to create a prelude client object: %s.\n",
+ prelude_strsource(ret), prelude_strerror(ret));
+
+ return -1;
+ }
+
+
+ ret = setup_analyzer(pamh, prelude_client_get_analyzer(client));
+ if ( ret < 0 ) {
+ pam_syslog(pamh, LOG_WARNING,
+ "%s: Unable to setup analyzer: %s\n",
+ prelude_strsource(ret), prelude_strerror(ret));
+
+ prelude_client_destroy(client, PRELUDE_CLIENT_EXIT_STATUS_FAILURE);
+
+ return -1;
+ }
+
+ ret = prelude_client_start(client);
+ if ( ret < 0 ) {
+ pam_syslog(pamh, LOG_WARNING,
+ "%s: Unable to initialize prelude client: %s.\n",
+ prelude_strsource(ret), prelude_strerror(ret));
+
+ prelude_client_destroy(client, PRELUDE_CLIENT_EXIT_STATUS_FAILURE);
+
+ return -1;
+ }
+
+ pam_alert_prelude("libpam alert" , client, pamh, authval);
+
+ prelude_client_destroy(client, PRELUDE_CLIENT_EXIT_STATUS_SUCCESS);
+
+ return 0;
+}
+
+void
+prelude_send_alert(pam_handle_t *pamh, int authval)
+{
+
+ int ret;
+
+ prelude_log_set_flags(PRELUDE_LOG_FLAGS_SYSLOG);
+
+ ret = pam_alert_prelude_init(pamh, authval);
+ if ( ret < 0 )
+ pam_syslog(pamh, LOG_WARNING, "No prelude alert sent");
+
+ prelude_deinit();
+
+}
+
+#endif /* PRELUDE */