1/* Licensed to the Apache Software Foundation (ASF) under one or more 2 * contributor license agreements. See the NOTICE file distributed with 3 * this work for additional information regarding copyright ownership. 4 * The ASF licenses this file to You under the Apache License, Version 2.0 5 * (the "License"); you may not use this file except in compliance with 6 * the License. You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17/* 18 * This file will include OS specific functions which are not inlineable. 19 * Any inlineable functions should be defined in os-inline.c instead. 20 */ 21 22#ifdef _OSD_POSIX 23 24#include "os.h" 25 26#include "httpd.h" 27#include "http_config.h" 28#include "http_log.h" 29#include "apr_lib.h" 30 31#define USER_LEN 8 32 33APLOG_USE_MODULE(core); 34 35typedef enum 36{ 37 bs2_unknown, /* not initialized yet. */ 38 bs2_noFORK, /* no fork() because -X flag was specified */ 39 bs2_FORK, /* only fork() because uid != 0 */ 40 bs2_UFORK /* Normally, ufork() is used to switch identities. */ 41} bs2_ForkType; 42 43static bs2_ForkType forktype = bs2_unknown; 44 45/* Determine the method for forking off a child in such a way as to 46 * set both the POSIX and BS2000 user id's to the unprivileged user. 47 */ 48static bs2_ForkType os_forktype(int one_process) 49{ 50 /* have we checked the OS version before? If yes return the previous 51 * result - the OS release isn't going to change suddenly! 52 */ 53 if (forktype == bs2_unknown) { 54 /* not initialized yet */ 55 56 /* No fork if the one_process option was set */ 57 if (one_process) { 58 forktype = bs2_noFORK; 59 } 60 /* If the user is unprivileged, use the normal fork() only. */ 61 else if (getuid() != 0) { 62 forktype = bs2_FORK; 63 } 64 else 65 forktype = bs2_UFORK; 66 } 67 return forktype; 68} 69 70 71 72/* This routine complements the setuid() call: it causes the BS2000 job 73 * environment to be switched to the target user's user id. 74 * That is important if CGI scripts try to execute native BS2000 commands. 75 */ 76int os_init_job_environment(server_rec *server, const char *user_name, int one_process) 77{ 78 bs2_ForkType type = os_forktype(one_process); 79 80 /* We can be sure that no change to uid==0 is possible because of 81 * the checks in http_core.c:set_user() 82 */ 83 84 if (one_process) { 85 86 type = forktype = bs2_noFORK; 87 88 ap_log_error(APLOG_MARK, APLOG_ERR, 0, server, APLOGNO(02170) 89 "The debug mode of Apache should only " 90 "be started by an unprivileged user!"); 91 return 0; 92 } 93 94 return 0; 95} 96 97/* BS2000 requires a "special" version of fork() before a setuid() call */ 98pid_t os_fork(const char *user) 99{ 100 pid_t pid; 101 char username[USER_LEN+1]; 102 103 switch (os_forktype(0)) { 104 105 case bs2_FORK: 106 pid = fork(); 107 break; 108 109 case bs2_UFORK: 110 apr_cpystrn(username, user, sizeof username); 111 112 /* Make user name all upper case - for some versions of ufork() */ 113 ap_str_toupper(username); 114 115 pid = ufork(username); 116 if (pid == -1 && errno == EPERM) { 117 ap_log_error(APLOG_MARK, APLOG_EMERG, errno, 118 ap_server_conf, APLOGNO(02171) "ufork: Possible mis-configuration " 119 "for user %s - Aborting.", user); 120 exit(1); 121 } 122 break; 123 124 default: 125 pid = 0; 126 break; 127 } 128 129 return pid; 130} 131 132#else /* _OSD_POSIX */ 133void bs2000_os_is_not_here() 134{ 135} 136#endif /* _OSD_POSIX */ 137