diff options
Diffstat (limited to 'rubbos/app/httpd-2.0.64/support/suexec.c')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/support/suexec.c | 619 |
1 files changed, 0 insertions, 619 deletions
diff --git a/rubbos/app/httpd-2.0.64/support/suexec.c b/rubbos/app/httpd-2.0.64/support/suexec.c deleted file mode 100644 index 06e55c4d..00000000 --- a/rubbos/app/httpd-2.0.64/support/suexec.c +++ /dev/null @@ -1,619 +0,0 @@ -/* 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. - */ - -/* - * suexec.c -- "Wrapper" support program for suEXEC behaviour for Apache - * - *********************************************************************** - * - * NOTE! : DO NOT edit this code!!! Unless you know what you are doing, - * editing this code might open up your system in unexpected - * ways to would-be crackers. Every precaution has been taken - * to make this code as safe as possible; alter it at your own - * risk. - * - *********************************************************************** - * - * - */ - -#include "apr.h" -#include "ap_config.h" -#include "suexec.h" - -#include <sys/param.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <string.h> -#include <time.h> -#if APR_HAVE_UNISTD_H -#include <unistd.h> -#endif - -#include <stdio.h> -#include <stdarg.h> -#include <stdlib.h> - -#ifdef HAVE_PWD_H -#include <pwd.h> -#endif - -#ifdef HAVE_GRP_H -#include <grp.h> -#endif - -/* - *********************************************************************** - * There is no initgroups() in QNX, so I believe this is safe :-) - * Use cc -osuexec -3 -O -mf -DQNX suexec.c to compile. - * - * May 17, 1997. - * Igor N. Kovalenko -- infoh@mail.wplus.net - *********************************************************************** - */ - -#if defined(NEED_INITGROUPS) -int initgroups(const char *name, gid_t basegid) -{ - /* QNX and MPE do not appear to support supplementary groups. */ - return 0; -} -#endif - -#if defined(SUNOS4) -extern char *sys_errlist[]; -#define strerror(x) sys_errlist[(x)] -#endif - -#if defined(PATH_MAX) -#define AP_MAXPATH PATH_MAX -#elif defined(MAXPATHLEN) -#define AP_MAXPATH MAXPATHLEN -#else -#define AP_MAXPATH 8192 -#endif - -#define AP_ENVBUF 256 - -extern char **environ; -static FILE *log = NULL; - -char *safe_env_lst[] = -{ - /* variable name starts with */ - "HTTP_", - "SSL_", - - /* variable name is */ - "AUTH_TYPE=", - "CONTENT_LENGTH=", - "CONTENT_TYPE=", - "DATE_GMT=", - "DATE_LOCAL=", - "DOCUMENT_NAME=", - "DOCUMENT_PATH_INFO=", - "DOCUMENT_ROOT=", - "DOCUMENT_URI=", - "FILEPATH_INFO=", - "GATEWAY_INTERFACE=", - "HTTPS=", - "LAST_MODIFIED=", - "PATH_INFO=", - "PATH_TRANSLATED=", - "QUERY_STRING=", - "QUERY_STRING_UNESCAPED=", - "REMOTE_ADDR=", - "REMOTE_HOST=", - "REMOTE_IDENT=", - "REMOTE_PORT=", - "REMOTE_USER=", - "REDIRECT_QUERY_STRING=", - "REDIRECT_REMOTE_USER=", - "REDIRECT_STATUS=", - "REDIRECT_URL=", - "REQUEST_METHOD=", - "REQUEST_URI=", - "SCRIPT_FILENAME=", - "SCRIPT_NAME=", - "SCRIPT_URI=", - "SCRIPT_URL=", - "SERVER_ADMIN=", - "SERVER_NAME=", - "SERVER_ADDR=", - "SERVER_PORT=", - "SERVER_PROTOCOL=", - "SERVER_SIGNATURE=", - "SERVER_SOFTWARE=", - "UNIQUE_ID=", - "USER_NAME=", - "TZ=", - NULL -}; - - -static void err_output(const char *fmt, va_list ap) -{ -#ifdef AP_LOG_EXEC - time_t timevar; - struct tm *lt; - - if (!log) { - if ((log = fopen(AP_LOG_EXEC, "a")) == NULL) { - fprintf(stderr, "failed to open log file\n"); - perror("fopen"); - exit(1); - } - } - - time(&timevar); - lt = localtime(&timevar); - - fprintf(log, "[%d-%.2d-%.2d %.2d:%.2d:%.2d]: ", - lt->tm_year + 1900, lt->tm_mon + 1, lt->tm_mday, - lt->tm_hour, lt->tm_min, lt->tm_sec); - - vfprintf(log, fmt, ap); - - fflush(log); -#endif /* AP_LOG_EXEC */ - return; -} - -static void log_err(const char *fmt,...) -{ -#ifdef AP_LOG_EXEC - va_list ap; - - va_start(ap, fmt); - err_output(fmt, ap); - va_end(ap); -#endif /* AP_LOG_EXEC */ - return; -} - -static void clean_env(void) -{ - char pathbuf[512]; - char **cleanenv; - char **ep; - int cidx = 0; - int idx; - - /* While cleaning the environment, the environment should be clean. - * (e.g. malloc() may get the name of a file for writing debugging info. - * Bad news if MALLOC_DEBUG_FILE is set to /etc/passwd. Sprintf() may be - * susceptible to bad locale settings....) - * (from PR 2790) - */ - char **envp = environ; - char *empty_ptr = NULL; - - environ = &empty_ptr; /* VERY safe environment */ - - if ((cleanenv = (char **) calloc(AP_ENVBUF, sizeof(char *))) == NULL) { - log_err("failed to malloc memory for environment\n"); - exit(120); - } - - sprintf(pathbuf, "PATH=%s", AP_SAFE_PATH); - cleanenv[cidx] = strdup(pathbuf); - cidx++; - - for (ep = envp; *ep && cidx < AP_ENVBUF-1; ep++) { - for (idx = 0; safe_env_lst[idx]; idx++) { - if (!strncmp(*ep, safe_env_lst[idx], - strlen(safe_env_lst[idx]))) { - cleanenv[cidx] = *ep; - cidx++; - break; - } - } - } - - cleanenv[cidx] = NULL; - - environ = cleanenv; -} - -int main(int argc, char *argv[]) -{ - int userdir = 0; /* ~userdir flag */ - uid_t uid; /* user information */ - gid_t gid; /* target group placeholder */ - char *target_uname; /* target user name */ - char *target_gname; /* target group name */ - char *target_homedir; /* target home directory */ - char *actual_uname; /* actual user name */ - char *actual_gname; /* actual group name */ - char *prog; /* name of this program */ - char *cmd; /* command to be executed */ - char cwd[AP_MAXPATH]; /* current working directory */ - char dwd[AP_MAXPATH]; /* docroot working directory */ - struct passwd *pw; /* password entry holder */ - struct group *gr; /* group entry holder */ - struct stat dir_info; /* directory info holder */ - struct stat prg_info; /* program info holder */ - - /* - * Start with a "clean" environment - */ - clean_env(); - - prog = argv[0]; - /* - * Check existence/validity of the UID of the user - * running this program. Error out if invalid. - */ - uid = getuid(); - if ((pw = getpwuid(uid)) == NULL) { - log_err("crit: invalid uid: (%ld)\n", uid); - exit(102); - } - /* - * See if this is a 'how were you compiled' request, and - * comply if so. - */ - if ((argc > 1) - && (! strcmp(argv[1], "-V")) - && ((uid == 0) -#ifdef _OSD_POSIX - /* User name comparisons are case insensitive on BS2000/OSD */ - || (! strcasecmp(AP_HTTPD_USER, pw->pw_name))) -#else /* _OSD_POSIX */ - || (! strcmp(AP_HTTPD_USER, pw->pw_name))) -#endif /* _OSD_POSIX */ - ) { -#ifdef AP_DOC_ROOT - fprintf(stderr, " -D AP_DOC_ROOT=\"%s\"\n", AP_DOC_ROOT); -#endif -#ifdef AP_GID_MIN - fprintf(stderr, " -D AP_GID_MIN=%d\n", AP_GID_MIN); -#endif -#ifdef AP_HTTPD_USER - fprintf(stderr, " -D AP_HTTPD_USER=\"%s\"\n", AP_HTTPD_USER); -#endif -#ifdef AP_LOG_EXEC - fprintf(stderr, " -D AP_LOG_EXEC=\"%s\"\n", AP_LOG_EXEC); -#endif -#ifdef AP_SAFE_PATH - fprintf(stderr, " -D AP_SAFE_PATH=\"%s\"\n", AP_SAFE_PATH); -#endif -#ifdef AP_SUEXEC_UMASK - fprintf(stderr, " -D AP_SUEXEC_UMASK=%03o\n", AP_SUEXEC_UMASK); -#endif -#ifdef AP_UID_MIN - fprintf(stderr, " -D AP_UID_MIN=%d\n", AP_UID_MIN); -#endif -#ifdef AP_USERDIR_SUFFIX - fprintf(stderr, " -D AP_USERDIR_SUFFIX=\"%s\"\n", AP_USERDIR_SUFFIX); -#endif - exit(0); - } - /* - * If there are a proper number of arguments, set - * all of them to variables. Otherwise, error out. - */ - if (argc < 4) { - log_err("too few arguments\n"); - exit(101); - } - target_uname = argv[1]; - target_gname = argv[2]; - cmd = argv[3]; - - /* - * Check to see if the user running this program - * is the user allowed to do so as defined in - * suexec.h. If not the allowed user, error out. - */ -#ifdef _OSD_POSIX - /* User name comparisons are case insensitive on BS2000/OSD */ - if (strcasecmp(AP_HTTPD_USER, pw->pw_name)) { - log_err("user mismatch (%s instead of %s)\n", pw->pw_name, AP_HTTPD_USER); - exit(103); - } -#else /*_OSD_POSIX*/ - if (strcmp(AP_HTTPD_USER, pw->pw_name)) { - log_err("user mismatch (%s instead of %s)\n", pw->pw_name, AP_HTTPD_USER); - exit(103); - } -#endif /*_OSD_POSIX*/ - - /* - * Check for a leading '/' (absolute path) in the command to be executed, - * or attempts to back up out of the current directory, - * to protect against attacks. If any are - * found, error out. Naughty naughty crackers. - */ - if ((cmd[0] == '/') || (!strncmp(cmd, "../", 3)) - || (strstr(cmd, "/../") != NULL)) { - log_err("invalid command (%s)\n", cmd); - exit(104); - } - - /* - * Check to see if this is a ~userdir request. If - * so, set the flag, and remove the '~' from the - * target username. - */ - if (!strncmp("~", target_uname, 1)) { - target_uname++; - userdir = 1; - } - - /* - * Error out if the target username is invalid. - */ - if (strspn(target_uname, "1234567890") != strlen(target_uname)) { - if ((pw = getpwnam(target_uname)) == NULL) { - log_err("invalid target user name: (%s)\n", target_uname); - exit(105); - } - } - else { - if ((pw = getpwuid(atoi(target_uname))) == NULL) { - log_err("invalid target user id: (%s)\n", target_uname); - exit(121); - } - } - - /* - * Error out if the target group name is invalid. - */ - if (strspn(target_gname, "1234567890") != strlen(target_gname)) { - if ((gr = getgrnam(target_gname)) == NULL) { - log_err("invalid target group name: (%s)\n", target_gname); - exit(106); - } - gid = gr->gr_gid; - actual_gname = strdup(gr->gr_name); - } - else { - gid = atoi(target_gname); - actual_gname = strdup(target_gname); - } - -#ifdef _OSD_POSIX - /* - * Initialize BS2000 user environment - */ - { - pid_t pid; - int status; - - switch (pid = ufork(target_uname)) { - case -1: /* Error */ - log_err("failed to setup bs2000 environment for user %s: %s\n", - target_uname, strerror(errno)); - exit(150); - case 0: /* Child */ - break; - default: /* Father */ - while (pid != waitpid(pid, &status, 0)) - ; - /* @@@ FIXME: should we deal with STOP signals as well? */ - if (WIFSIGNALED(status)) { - kill (getpid(), WTERMSIG(status)); - } - exit(WEXITSTATUS(status)); - } - } -#endif /*_OSD_POSIX*/ - - /* - * Save these for later since initgroups will hose the struct - */ - uid = pw->pw_uid; - actual_uname = strdup(pw->pw_name); - target_homedir = strdup(pw->pw_dir); - - /* - * Log the transaction here to be sure we have an open log - * before we setuid(). - */ - log_err("uid: (%s/%s) gid: (%s/%s) cmd: %s\n", - target_uname, actual_uname, - target_gname, actual_gname, - cmd); - - /* - * Error out if attempt is made to execute as root or as - * a UID less than AP_UID_MIN. Tsk tsk. - */ - if ((uid == 0) || (uid < AP_UID_MIN)) { - log_err("cannot run as forbidden uid (%d/%s)\n", uid, cmd); - exit(107); - } - - /* - * Error out if attempt is made to execute as root group - * or as a GID less than AP_GID_MIN. Tsk tsk. - */ - if ((gid == 0) || (gid < AP_GID_MIN)) { - log_err("cannot run as forbidden gid (%d/%s)\n", gid, cmd); - exit(108); - } - - /* - * Change UID/GID here so that the following tests work over NFS. - * - * Initialize the group access list for the target user, - * and setgid() to the target group. If unsuccessful, error out. - */ - if (((setgid(gid)) != 0) || (initgroups(actual_uname, gid) != 0)) { - log_err("failed to setgid (%ld: %s)\n", gid, cmd); - exit(109); - } - - /* - * setuid() to the target user. Error out on fail. - */ - if ((setuid(uid)) != 0) { - log_err("failed to setuid (%ld: %s)\n", uid, cmd); - exit(110); - } - - /* - * Get the current working directory, as well as the proper - * document root (dependant upon whether or not it is a - * ~userdir request). Error out if we cannot get either one, - * or if the current working directory is not in the docroot. - * Use chdir()s and getcwd()s to avoid problems with symlinked - * directories. Yuck. - */ - if (getcwd(cwd, AP_MAXPATH) == NULL) { - log_err("cannot get current working directory\n"); - exit(111); - } - - if (userdir) { - if (((chdir(target_homedir)) != 0) || - ((chdir(AP_USERDIR_SUFFIX)) != 0) || - ((getcwd(dwd, AP_MAXPATH)) == NULL) || - ((chdir(cwd)) != 0)) { - log_err("cannot get docroot information (%s)\n", target_homedir); - exit(112); - } - } - else { - if (((chdir(AP_DOC_ROOT)) != 0) || - ((getcwd(dwd, AP_MAXPATH)) == NULL) || - ((chdir(cwd)) != 0)) { - log_err("cannot get docroot information (%s)\n", AP_DOC_ROOT); - exit(113); - } - } - - if ((strncmp(cwd, dwd, strlen(dwd))) != 0) { - log_err("command not in docroot (%s/%s)\n", cwd, cmd); - exit(114); - } - - /* - * Stat the cwd and verify it is a directory, or error out. - */ - if (((lstat(cwd, &dir_info)) != 0) || !(S_ISDIR(dir_info.st_mode))) { - log_err("cannot stat directory: (%s)\n", cwd); - exit(115); - } - - /* - * Error out if cwd is writable by others. - */ - if ((dir_info.st_mode & S_IWOTH) || (dir_info.st_mode & S_IWGRP)) { - log_err("directory is writable by others: (%s)\n", cwd); - exit(116); - } - - /* - * Error out if we cannot stat the program. - */ - if (((lstat(cmd, &prg_info)) != 0) || (S_ISLNK(prg_info.st_mode))) { - log_err("cannot stat program: (%s)\n", cmd); - exit(117); - } - - /* - * Error out if the program is writable by others. - */ - if ((prg_info.st_mode & S_IWOTH) || (prg_info.st_mode & S_IWGRP)) { - log_err("file is writable by others: (%s/%s)\n", cwd, cmd); - exit(118); - } - - /* - * Error out if the file is setuid or setgid. - */ - if ((prg_info.st_mode & S_ISUID) || (prg_info.st_mode & S_ISGID)) { - log_err("file is either setuid or setgid: (%s/%s)\n", cwd, cmd); - exit(119); - } - - /* - * Error out if the target name/group is different from - * the name/group of the cwd or the program. - */ - if ((uid != dir_info.st_uid) || - (gid != dir_info.st_gid) || - (uid != prg_info.st_uid) || - (gid != prg_info.st_gid)) { - log_err("target uid/gid (%ld/%ld) mismatch " - "with directory (%ld/%ld) or program (%ld/%ld)\n", - uid, gid, - dir_info.st_uid, dir_info.st_gid, - prg_info.st_uid, prg_info.st_gid); - exit(120); - } - /* - * Error out if the program is not executable for the user. - * Otherwise, she won't find any error in the logs except for - * "[error] Premature end of script headers: ..." - */ - if (!(prg_info.st_mode & S_IXUSR)) { - log_err("file has no execute permission: (%s/%s)\n", cwd, cmd); - exit(121); - } - -#ifdef AP_SUEXEC_UMASK - /* - * umask() uses inverse logic; bits are CLEAR for allowed access. - */ - if ((~AP_SUEXEC_UMASK) & 0022) { - log_err("notice: AP_SUEXEC_UMASK of %03o allows " - "write permission to group and/or other\n", AP_SUEXEC_UMASK); - } - umask(AP_SUEXEC_UMASK); -#endif /* AP_SUEXEC_UMASK */ - - /* - * Be sure to close the log file so the CGI can't - * mess with it. If the exec fails, it will be reopened - * automatically when log_err is called. Note that the log - * might not actually be open if AP_LOG_EXEC isn't defined. - * However, the "log" cell isn't ifdef'd so let's be defensive - * and assume someone might have done something with it - * outside an ifdef'd AP_LOG_EXEC block. - */ - if (log != NULL) { - fclose(log); - log = NULL; - } - - /* - * Execute the command, replacing our image with its own. - */ -#ifdef NEED_HASHBANG_EMUL - /* We need the #! emulation when we want to execute scripts */ - { - extern char **environ; - - ap_execve(cmd, &argv[3], environ); - } -#else /*NEED_HASHBANG_EMUL*/ - execv(cmd, &argv[3]); -#endif /*NEED_HASHBANG_EMUL*/ - - /* - * (I can't help myself...sorry.) - * - * Uh oh. Still here. Where's the kaboom? There was supposed to be an - * EARTH-shattering kaboom! - * - * Oh well, log the failure and error out. - */ - log_err("(%d)%s: exec failed (%s)\n", errno, strerror(errno), cmd); - exit(255); -} |