Use conditional build for retrieving ccache.

Some krb5 functions needn't be available for retrieving ccache
with principal. Therefore ifdef is used to solve this situation with older
version of libkrb5. There were two functions with similar functionality
in krb5_child and krb5_utils. They were merged to one universal function, which
was moved to file src/util/sss_krb5.c

1 files changed, 52 insertions, 0 deletions

diff --git a/src/util/sss_krb5.c b/src/util/sss_krb5.c
index 7d42e97f..204e0c2a 100644
--- a/src/util/sss_krb5.c
+++ b/src/util/sss_krb5.c
@@ -1179,3 +1179,55 @@ done:
     return ENOTSUP;
 #endif
 }
+
+char * sss_get_ccache_name_for_principal(TALLOC_CTX *mem_ctx,
+                                         krb5_context ctx,
+                                         krb5_principal principal,
+                                         const char *location)
+{
+#ifdef HAVE_KRB5_DIRCACHE
+    krb5_error_code kerr;
+    krb5_ccache tmp_cc = NULL;
+    char *tmp_ccname = NULL;
+    char *ret_ccname = NULL;
+
+    kerr = krb5_cc_set_default_name(ctx, location);
+    if (kerr != 0) {
+        KRB5_DEBUG(SSSDBG_MINOR_FAILURE, ctx, kerr);
+        return NULL;
+    }
+
+    kerr = krb5_cc_cache_match(ctx, principal, &tmp_cc);
+    if (kerr != 0) {
+        const char *err_msg = sss_krb5_get_error_message(ctx, kerr);
+        DEBUG(SSSDBG_TRACE_INTERNAL,
+              ("krb5_cc_cache_match failed: [%d][%s]\n", kerr, err_msg));
+        sss_krb5_free_error_message(ctx, err_msg);
+        return NULL;
+    }
+
+    kerr = krb5_cc_get_full_name(ctx, tmp_cc, &tmp_ccname);
+    if (kerr != 0) {
+        KRB5_DEBUG(SSSDBG_MINOR_FAILURE, ctx, kerr);
+        goto done;
+    }
+
+    ret_ccname = talloc_strdup(mem_ctx, tmp_ccname);
+    if (ret_ccname == NULL) {
+        DEBUG(SSSDBG_OP_FAILURE, ("talloc_strdup failed (ENOMEM).\n"));
+    }
+
+done:
+    if (tmp_cc != NULL) {
+        kerr = krb5_cc_close(ctx, tmp_cc);
+        if (kerr != 0) {
+            KRB5_DEBUG(SSSDBG_MINOR_FAILURE, ctx, kerr);
+        }
+    }
+    krb5_free_string(ctx, tmp_ccname);
+
+    return ret_ccname;
+#else
+    return NULL;
+#endif /* HAVE_KRB5_DIRCACHE */
+}