IPA/AD: globally set krb5 canonicalization flag

If Kerberos principal canonicalization is configured in SSSD, currently
it is the default for the IPA provider, a configuration snippet is
generated for the system-wide libkrb5 configuration so that all
kerberized applications will use canonicalization by default.

Resolves https://fedorahosted.org/sssd/ticket/3041

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

1 files changed, 47 insertions, 1 deletions

diff --git a/src/util/domain_info_utils.c b/src/util/domain_info_utils.c
index adb3f1247..6fc15a045 100644
--- a/src/util/domain_info_utils.c
+++ b/src/util/domain_info_utils.c
@@ -658,7 +658,45 @@ done:
 #endif
 }
 
-errno_t sss_write_krb5_conf_snippet(const char *path)
+#define KRB5_LIBDEFAUTLS_CONFIG \
+"[libdefaults]\n" \
+" canonicalize = true\n"
+
+static errno_t sss_write_krb5_libdefaults_snippet(const char *path)
+{
+    int ret;
+    TALLOC_CTX *tmp_ctx = NULL;
+    const char *file_name;
+
+    tmp_ctx = talloc_new(NULL);
+    if (tmp_ctx == NULL) {
+        DEBUG(SSSDBG_OP_FAILURE, "talloc_new failed.\n");
+        return ENOMEM;
+    }
+
+    file_name = talloc_asprintf(tmp_ctx, "%s/krb5_libdefaults", path);
+    if (file_name == NULL) {
+        DEBUG(SSSDBG_OP_FAILURE, "talloc_asprintf failed.\n");
+        ret = ENOMEM;
+        goto done;
+    }
+
+    DEBUG(SSSDBG_FUNC_DATA, "File for KRB5 kibdefaults configuration is [%s]\n",
+                             file_name);
+
+    ret = sss_write_krb5_snippet_common(file_name, KRB5_LIBDEFAUTLS_CONFIG);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_OP_FAILURE, "sss_write_krb5_snippet_common failed.\n");
+        goto done;
+    }
+
+done:
+
+    talloc_free(tmp_ctx);
+    return ret;
+}
+
+errno_t sss_write_krb5_conf_snippet(const char *path, bool canonicalize)
 {
     errno_t ret;
     errno_t err;
@@ -680,6 +718,14 @@ errno_t sss_write_krb5_conf_snippet(const char *path)
         goto done;
     }
 
+    if (canonicalize) {
+        ret = sss_write_krb5_libdefaults_snippet(path);
+        if (ret != EOK) {
+            DEBUG(SSSDBG_OP_FAILURE, "sss_write_krb5_libdefaults_snippet failed.\n");
+            goto done;
+        }
+    }
+
     ret = EOK;
 
 done: