From 46c6cb2759327d94e619454dbe61f1e7639dd607 Mon Sep 17 00:00:00 2001
From: Armin Abfalterer <armin.abfalterer@united-security-providers.ch>
Date: Tue, 12 Mar 2019 16:29:43 +0100
Subject: [PATCH] use uid if user name is not available

---
 apache2/msc_logging.c | 10 +++++++---
 apache2/persist_dbm.c | 29 +++++++++++++++++++----------
 2 files changed, 26 insertions(+), 13 deletions(-)

diff --git a/apache2/msc_logging.c b/apache2/msc_logging.c
index d50f709e..d1a867c3 100644
--- a/apache2/msc_logging.c
+++ b/apache2/msc_logging.c
@@ -234,16 +234,20 @@ static char *construct_auditlog_filename(apr_pool_t *mp, const char *uniqueid) {
      * This is required for mpm-itk & mod_ruid2, though should be harmless for other implementations 
      * It also changes the return statement.
      */
-    char *username;
+    char *userinfo;
+    apr_status_t rc;
     apr_uid_t uid;
     apr_gid_t gid;
     apr_uid_current(&uid, &gid, mp);
-    apr_uid_name_get(&username, uid, mp);
+    rc = apr_uid_name_get(&userinfo, uid, mp);
+    if (rc != APR_SUCCESS) {
+      userinfo = apr_psprintf(mp, "%u", uid);
+    }
 
     apr_time_exp_lt(&t, apr_time_now());
 
     apr_strftime(tstr, &len, 299, "/%Y%m%d/%Y%m%d-%H%M/%Y%m%d-%H%M%S", &t);
-    return apr_psprintf(mp, "/%s%s-%s", username, tstr, uniqueid);
+    return apr_psprintf(mp, "/%s%s-%s", userinfo, tstr, uniqueid);
 }
 
 /**
diff --git a/apache2/persist_dbm.c b/apache2/persist_dbm.c
index efbbf6eb..e4f8036f 100644
--- a/apache2/persist_dbm.c
+++ b/apache2/persist_dbm.c
@@ -104,11 +104,14 @@ static apr_table_t *collection_retrieve_ex(apr_sdbm_t *existing_dbm, modsec_rec
     /**
      * This is required for mpm-itk & mod_ruid2, though should be harmless for other implementations 
      */
-    char *username;
+    char *userinfo;
     apr_uid_t uid;
     apr_gid_t gid;
     apr_uid_current(&uid, &gid, msr->mp);
-    apr_uid_name_get(&username, uid, msr->mp);
+    rc = apr_uid_name_get(&userinfo, uid, msr->mp);
+    if (rc != APR_SUCCESS) {
+      userinfo = apr_psprintf(msr->mp, "%u", uid);
+    }
 
     if (msr->txcfg->data_dir == NULL) {
         msr_log(msr, 1, "collection_retrieve_ex: Unable to retrieve collection (name \"%s\", key \"%s\"). Use "
@@ -117,7 +120,7 @@ static apr_table_t *collection_retrieve_ex(apr_sdbm_t *existing_dbm, modsec_rec
         goto cleanup;
     }
 
-    dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", username, "-", col_name, NULL);
+    dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", userinfo, "-", col_name, NULL);
 
     if (msr->txcfg->debuglog_level >= 9) {
         msr_log(msr, 9, "collection_retrieve_ex: collection_retrieve_ex: Retrieving collection (name \"%s\", filename \"%s\")",log_escape(msr->mp, col_name),
@@ -385,11 +388,14 @@ int collection_store(modsec_rec *msr, apr_table_t *col) {
     /**
      * This is required for mpm-itk & mod_ruid2, though should be harmless for other implementations 
      */
-    char *username;
+    char *userinfo;
     apr_uid_t uid;
     apr_gid_t gid;
     apr_uid_current(&uid, &gid, msr->mp);
-    apr_uid_name_get(&username, uid, msr->mp);
+    rc = apr_uid_name_get(&userinfo, uid, msr->mp);
+    if (rc != APR_SUCCESS) {
+      userinfo = apr_psprintf(msr->mp, "%u", uid);
+    }
 
     var_name = (msc_string *)apr_table_get(col, "__name");
     if (var_name == NULL) {
@@ -409,7 +415,7 @@ int collection_store(modsec_rec *msr, apr_table_t *col) {
     }
 
     // ENH: lowercase the var name in the filename
-    dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", username, "-", var_name->value, NULL);
+    dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", userinfo, "-", var_name->value, NULL);
 
     if (msr->txcfg->debuglog_level >= 9) {
         msr_log(msr, 9, "collection_store: Retrieving collection (name \"%s\", filename \"%s\")",log_escape(msr->mp, var_name->value),
@@ -675,11 +681,14 @@ int collections_remove_stale(modsec_rec *msr, const char *col_name) {
     /**
      * This is required for mpm-itk & mod_ruid2, though should be harmless for other implementations 
      */
-    char *username;
+    char *userinfo;
     apr_uid_t uid;
     apr_gid_t gid;
     apr_uid_current(&uid, &gid, msr->mp);
-    apr_uid_name_get(&username, uid, msr->mp);
+    rc = apr_uid_name_get(&userinfo, uid, msr->mp);
+    if (rc != APR_SUCCESS) {
+      userinfo = apr_psprintf(msr->mp, "%u", uid);
+    }
 
     if (msr->txcfg->data_dir == NULL) {
         /* The user has been warned about this problem enough times already by now.
@@ -690,9 +699,9 @@ int collections_remove_stale(modsec_rec *msr, const char *col_name) {
     }
 
     if(strstr(col_name,"USER") || strstr(col_name,"SESSION") || strstr(col_name, "RESOURCE"))
-        dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", username, "-", msr->txcfg->webappid, "_", col_name, NULL);
+        dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", userinfo, "-", msr->txcfg->webappid, "_", col_name, NULL);
     else
-        dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", username, "-", col_name, NULL);
+        dbm_filename = apr_pstrcat(msr->mp, msr->txcfg->data_dir, "/", userinfo, "-", col_name, NULL);
 
     if (msr->txcfg->debuglog_level >= 9) {
         msr_log(msr, 9, "collections_remove_stale: Retrieving collection (name \"%s\", filename \"%s\")",log_escape(msr->mp, col_name),
-- 
2.27.0