Fix PKCS11 module path search

Commit c5c11839e02c7993eb78f2c94c75c10cf93f2195 switched the loading
of the PKCS#11 module from dlopen() to krb5int_open_plugin().  Because
krb5int_open_plugin() includes a stat() test, this change has the
unintended consequence of requiring the module name to be an absolute
or relative path to the library, not a filename within the dynamic
linker search path.

Within krb5int_open_plugin(), only stat() the filename on the
platforms which will use the file type.

[ghudson@mit.edu: adjusted conditionals to call stat() on Windows;
rewrote commit message]

(cherry picked from commit e134d9a6b6332bd085093e9075c949ece784fcd0)

ticket: 9067
version_fixed: 1.20.1

diff --git a/src/util/support/plugins.c b/src/util/support/plugins.c
index 1ff10c354d0fc3d24637132056c8b8f58057523c..c6a9a21d57c71e01ba0936711007c4fa0b3f0652 100644 (file)
--- a/src/util/support/plugins.c
+++ b/src/util/support/plugins.c
@@ -189,9 +189,10 @@ long KRB5_CALLCONV
 krb5int_open_plugin (const char *filepath, struct plugin_file_handle **h, struct errinfo *ep)
 {
     long err = 0;
-    struct stat statbuf;
     struct plugin_file_handle *htmp = NULL;
     int got_plugin = 0;
+#if defined(USE_CFBUNDLE) || defined(_WIN32)
+    struct stat statbuf;
 
     if (!err) {
         if (stat (filepath, &statbuf) < 0) {
@@ -201,6 +202,7 @@ krb5int_open_plugin (const char *filepath, struct plugin_file_handle **h, struct
                          filepath, strerror(err));
         }
     }
+#endif
 
     if (!err) {
         htmp = calloc (1, sizeof (*htmp)); /* calloc initializes ptrs to NULL */
@@ -208,11 +210,12 @@ krb5int_open_plugin (const char *filepath, struct plugin_file_handle **h, struct
     }
 
 #if USE_DLOPEN
-    if (!err && ((statbuf.st_mode & S_IFMT) == S_IFREG
+    if (!err
 #if USE_CFBUNDLE
-                 || (statbuf.st_mode & S_IFMT) == S_IFDIR
+                 && ((statbuf.st_mode & S_IFMT) == S_IFREG
+                 || (statbuf.st_mode & S_IFMT) == S_IFDIR)
 #endif /* USE_CFBUNDLE */
-        )) {
+        ) {
         void *handle = NULL;
 
 #if USE_CFBUNDLE