krb5 commit [krb5-1.11]: Don't save empty cc_config_out in ccache

[Tom Yu]

https://github.com/krb5/krb5/commit/38cfcb9d83112b0212e8a920bacc19a628fa4ce3
commit 38cfcb9d83112b0212e8a920bacc19a628fa4ce3
Author: Greg Hudson <ghudson at mit.edu>
Date:   Wed Oct 24 12:06:01 2012 -0400

    Don't save empty cc_config_out in ccache
    
    Add an internal json function to make it easier to detect if an object
    is empty, and use it to avoid creating a ccache config entry for
    preauth module config data if there isn't any to save.
    
    (cherry picked from commit ec6dc0e991b3653e16a637bfaa0daf783f82af31)
    
    ticket: 7427
    version_fixed: 1.11
    status: resolved

 src/include/k5-json.h                         |    2 ++
 src/lib/krb5/krb/get_in_tkt.c                 |    3 ++-
 src/util/support/json.c                       |    6 ++++++
 src/util/support/libkrb5support-fixed.exports |    1 +
 4 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/src/include/k5-json.h b/src/include/k5-json.h
index fb9a3af..42dcfa3 100644
--- a/src/include/k5-json.h
+++ b/src/include/k5-json.h
@@ -148,6 +148,8 @@ k5_json_object k5_json_object_create(void);
 void k5_json_object_iterate(k5_json_object obj,
                             k5_json_object_iterator_fn func, void *arg);
 
+/* Return the number of mappings in an object. */
+size_t k5_json_object_count(k5_json_object obj);
 
 /* Store val into object at key, incrementing val's reference count. */
 int k5_json_object_set(k5_json_object obj, const char *key, k5_json_value val);
diff --git a/src/lib/krb5/krb/get_in_tkt.c b/src/lib/krb5/krb/get_in_tkt.c
index c2cd9e8..c20d4b7 100644
--- a/src/lib/krb5/krb/get_in_tkt.c
+++ b/src/lib/krb5/krb/get_in_tkt.c
@@ -1198,7 +1198,8 @@ save_cc_config_out_data(krb5_context context, krb5_ccache ccache,
     char *encoded;
     krb5_error_code code;
 
-    if (ctx->cc_config_out == NULL)
+    if (ctx->cc_config_out == NULL ||
+        k5_json_object_count(ctx->cc_config_out) == 0)
         return 0;
     encoded = k5_json_encode(ctx->cc_config_out);
     if (encoded == NULL)
diff --git a/src/util/support/json.c b/src/util/support/json.c
index e6d7eea..f02fe26 100644
--- a/src/util/support/json.c
+++ b/src/util/support/json.c
@@ -295,6 +295,12 @@ k5_json_object_create(void)
     return alloc_value(&object_type, sizeof(struct k5_json_object_st));
 }
 
+size_t
+k5_json_object_count(k5_json_object obj)
+{
+    return obj->len;
+}
+
 /* Return the entry for key within obj, or NULL if none exists. */
 static struct entry *
 object_search(k5_json_object obj, const char *key)
diff --git a/src/util/support/libkrb5support-fixed.exports b/src/util/support/libkrb5support-fixed.exports
index 13b1b57..0579611 100644
--- a/src/util/support/libkrb5support-fixed.exports
+++ b/src/util/support/libkrb5support-fixed.exports
@@ -11,6 +11,7 @@ k5_json_get_tid
 k5_json_null_create
 k5_json_number_create
 k5_json_number_value
+k5_json_object_count
 k5_json_object_create
 k5_json_object_get
 k5_json_object_iterate