Move tridge's getgrouplist() replacement function from replace.c to a new

'system_smbd.c' file, where it can link with become_root() and unbecome_root(),
and therefore avoiding some nasty 'it workes on linux' bugs.

(The replacement function is implemented in terms of initgroups(), which is
naturally only avaliable to root).

Andrew Bartlett
(This used to be commit a91018dd026be3db473bb1cf1f4981295f9758e4)

1 files changed, 65 insertions, 0 deletions

diff --git a/source3/lib/util_smbd.c b/source3/lib/util_smbd.c
new file mode 100644
index 00000000000..071f20b4162
--- /dev/null
+++ b/source3/lib/util_smbd.c
@@ -0,0 +1,65 @@
+/*
+   Unix SMB/CIFS implementation.
+   Samba utility functions, used in smbd only
+   Copyright (C) Andrew Tridgell 2002
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/* 
+   This function requires sys_getgrouplist - which is only
+   available in smbd due to it's use of become_root() in a 
+   legacy systems hack.
+*/
+
+/*
+  return a full list of groups for a user
+
+  returns the number of groups the user is a member of. The return will include the
+  users primary group.
+
+  remember to free the resulting gid_t array
+
+  NOTE! uses become_root() to gain correct priviages on systems
+  that lack a native getgroups() call (uses initgroups and getgroups)
+*/
+int getgroups_user(const char *user, gid_t **groups)
+{
+	struct passwd *pwd;
+	int ngrp, max_grp;
+
+	pwd = getpwnam_alloc(user);
+	if (!pwd) return -1;
+
+	max_grp = groups_max();
+	(*groups) = (gid_t *)malloc(sizeof(gid_t) * max_grp);
+	if (! *groups) {
+		passwd_free(&pwd);
+		errno = ENOMEM;
+		return -1;
+	}
+
+	ngrp = sys_getgrouplist(user, pwd->pw_gid, *groups, &max_grp);
+	if (ngrp <= 0) {
+		passwd_free(&pwd);
+		free(*groups);
+		return ngrp;
+	}
+
+	passwd_free(&pwd);
+	return ngrp;
+}