krb5_wrap: Make smb_krb5_get_realm_from_hostname() public

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12554

Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>

Signed-off-by: Andreas Schneider <asn@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>

2 files changed, 25 insertions, 7 deletions

diff --git a/lib/krb5_wrap/krb5_samba.c b/lib/krb5_wrap/krb5_samba.c
index c2d0d7263cb..0bce8509cca 100644
--- a/lib/krb5_wrap/krb5_samba.c
+++ b/lib/krb5_wrap/krb5_samba.c
@@ -2683,13 +2683,27 @@ static char *smb_krb5_get_default_realm_from_ccache(TALLOC_CTX *mem_ctx)
 	return realm;
 }
 
-/************************************************************************
- Routine to get the realm from a given DNS name.
-************************************************************************/
-
-static char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
-						const char *hostname,
-						const char *client_realm)
+/**
+ * @brief Get the realm from the service hostname.
+ *
+ * This function will look for a domain realm mapping in the [domain_realm]
+ * section of the krb5.conf first and fallback to extract the realm from
+ * the provided service hostname. As a last resort it will return the
+ * provided client_realm.
+ *
+ * @param[in]  mem_ctx     The talloc context
+ *
+ * @param[in]  hostname    The service hostname
+ *
+ * @param[in]  client_realm  If we can not find a mapping, fall back to
+ *                           this realm.
+ *
+ * @return The realm to use for the service hostname, NULL if a fatal error
+ *         occured.
+ */
+char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
+				       const char *hostname,
+				       const char *client_realm)
 {
 #if defined(HAVE_KRB5_REALM_TYPE)
 	/* Heimdal. */
diff --git a/lib/krb5_wrap/krb5_samba.h b/lib/krb5_wrap/krb5_samba.h
index 71e81ea26e1..accae449a0e 100644
--- a/lib/krb5_wrap/krb5_samba.h
+++ b/lib/krb5_wrap/krb5_samba.h
@@ -314,6 +314,10 @@ krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
 					     krb5_principal principal,
 					     const char *realm);
 
+char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
+				       const char *hostname,
+				       const char *client_realm);
+
 char *smb_krb5_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
 						   const char *service,
 						   const char *remote_name,