| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| |
| /* |
| * Wrapper to run the svnserve process setgid. |
| * The idea is to avoid the problem that some interpreters like bash |
| * invoked by svnserve in hook scripts will reset the effective gid to |
| * the real gid, nuking the effect of an ordinary setgid svnserve binary. |
| * Sadly, to set the real gid portably, you need to be root, if only |
| * for a moment. |
| * Also smashes the environment to something known, so that games |
| * can't be played to try to break the security of the hook scripts, |
| * by setting IFS, PATH, and similar means. |
| */ |
| /* |
| * Written by Perry Metzger, and placed into the public domain. |
| */ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| |
| #define REAL_PATH "/usr/bin/svnserve.real" |
| |
| char *newenv[] = { "PATH=/bin:/usr/bin", "SHELL=/bin/sh", NULL }; |
| |
| int |
| main(int argc, char **argv) |
| { |
| if (setgid(getegid()) == -1) { |
| perror("setgid(getegid())"); |
| return 1; |
| } |
| |
| if (seteuid(getuid()) == -1) { |
| perror("seteuid(getuid())"); |
| return 1; |
| } |
| |
| execve(REAL_PATH, argv, newenv); |
| perror("attempting to exec " REAL_PATH " failed"); |
| return 1; |
| } |