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-rw-r--r--source3/utils/smbrun.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/source3/utils/smbrun.c b/source3/utils/smbrun.c
new file mode 100644
index 0000000000..2a94ac3235
--- /dev/null
+++ b/source3/utils/smbrun.c
@@ -0,0 +1,92 @@
+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ external program running routine
+ Copyright (C) Andrew Tridgell 1992-1998
+
+ 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"
+
+
+/*******************************************************************
+close the low 3 fd's and open dev/null in their place
+********************************************************************/
+static void close_fds(void)
+{
+ int fd;
+ int i;
+ close(0); close(1); close(2);
+ /* try and use up these file descriptors, so silly
+ library routines writing to stdout etc won't cause havoc */
+ for (i=0;i<3;i++) {
+ fd = open("/dev/null",O_RDWR,0);
+ if (fd < 0) fd = open("/dev/null",O_WRONLY,0);
+ if (fd != i) return;
+ }
+}
+
+
+/*
+This is a wrapper around the system() call to allow commands to run correctly
+as non root from a program which is switching between root and non-root
+
+It takes 3 arguments as uid,gid,command and runs command after
+becoming a non-root user */
+ int main(int argc,char *argv[])
+{
+ int uid,gid;
+
+ close_fds();
+
+ if (argc != 4) exit(2);
+
+ uid = atoi(argv[1]);
+ gid = atoi(argv[2]);
+
+ /* first become root - we may need to do this in order to lose
+ our privilages! */
+#ifdef HAVE_SETRESUID
+ setresgid(0,0,0);
+ setresuid(0,0,0);
+#else
+ setuid(0);
+ seteuid(0);
+#endif
+
+#ifdef HAVE_SETRESUID
+ setresgid(gid,gid,gid);
+ setresuid(uid,uid,uid);
+#else
+ setgid(gid);
+ setegid(gid);
+ setuid(uid);
+ seteuid(uid);
+#endif
+
+
+ /* paranoia :-) */
+ if (getuid() != uid)
+ return(3);
+
+ if (geteuid() != getuid())
+ return(4);
+
+ /* this is to make sure that the system() call doesn't run forever */
+ alarm(30);
+
+ return(system(argv[3]));
+}