s3: Implement wbcGetpwsid

* Adds the plumbing required to lookup users by sid into winbind, wbinfo
  and smbd helper lib (winbind_util.c).
* Removes some double declarations of winbind_util.c functions.
* Bumps the winbind protocol version to 21 and the minor version of
  wbclient to 3.

2 files changed, 52 insertions, 1 deletions

diff --git a/nsswitch/libwbclient/wbc_pwd.c b/nsswitch/libwbclient/wbc_pwd.c
index cd945996c8..dacd9499dd 100644
--- a/nsswitch/libwbclient/wbc_pwd.c
+++ b/nsswitch/libwbclient/wbc_pwd.c
@@ -190,6 +190,45 @@ wbcErr wbcGetpwuid(uid_t uid, struct passwd **pwd)
 	return wbc_status;
 }
 
+/* Fill in a struct passwd* for a domain user based on sid */
+wbcErr wbcGetpwsid(struct wbcDomainSid *sid, struct passwd **pwd)
+{
+	wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
+	struct winbindd_request request;
+	struct winbindd_response response;
+	char * sid_string = NULL;
+
+	if (!pwd) {
+		wbc_status = WBC_ERR_INVALID_PARAM;
+		BAIL_ON_WBC_ERROR(wbc_status);
+	}
+
+	wbc_status = wbcSidToString(sid, &sid_string);
+	BAIL_ON_WBC_ERROR(wbc_status);
+
+	/* Initialize request */
+
+	ZERO_STRUCT(request);
+	ZERO_STRUCT(response);
+
+	strncpy(request.data.sid, sid_string, sizeof(request.data.sid));
+
+	wbc_status = wbcRequestResponse(WINBINDD_GETPWSID,
+					&request,
+					&response);
+	BAIL_ON_WBC_ERROR(wbc_status);
+
+	*pwd = copy_passwd_entry(&response.data.pw);
+	BAIL_ON_PTR_ERROR(*pwd, wbc_status);
+
+ done:
+	if (sid_string) {
+		wbcFreeMemory(sid_string);
+	}
+
+	return wbc_status;
+}
+
 /* Fill in a struct passwd* for a domain user based on username */
 wbcErr wbcGetgrnam(const char *name, struct group **grp)
 {
diff --git a/nsswitch/libwbclient/wbclient.h b/nsswitch/libwbclient/wbclient.h
index 990cc52df7..4663624f91 100644
--- a/nsswitch/libwbclient/wbclient.h
+++ b/nsswitch/libwbclient/wbclient.h
@@ -60,9 +60,10 @@ const char *wbcErrorString(wbcErr error);
  *  0.1: Initial version
  *  0.2: Added wbcRemoveUidMapping()
  *       Added wbcRemoveGidMapping()
+ *  0.3: Added wbcGetpwsid()
  **/
 #define WBCLIENT_MAJOR_VERSION 0
-#define WBCLIENT_MINOR_VERSION 2
+#define WBCLIENT_MINOR_VERSION 3
 #define WBCLIENT_VENDOR_VERSION "Samba libwbclient"
 struct wbcLibraryDetails {
 	uint16_t major_version;
@@ -838,6 +839,17 @@ wbcErr wbcGetpwuid(uid_t uid, struct passwd **pwd);
 
 /**
  * @brief Fill in a struct passwd* for a domain user based
+ *   on sid
+ *
+ * @param sid       Sid to lookup
+ * @param **pwd     Pointer to resulting struct passwd* from the query.
+ *
+ * @return #wbcErr
+ **/
+wbcErr wbcGetpwsid(struct wbcDomainSid * sid, struct passwd **pwd);
+
+/**
+ * @brief Fill in a struct passwd* for a domain user based
  *   on username
  *
  * @param *name     Username to lookup