Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
apache-httpd/os/unix/unixd.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
541 lines (479 sloc)
16.1 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* 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. | |
*/ | |
#include "ap_config.h" | |
#include "httpd.h" | |
#include "http_config.h" | |
#include "http_main.h" | |
#include "http_log.h" | |
#include "unixd.h" | |
#include "mpm_common.h" | |
#include "os.h" | |
#include "ap_mpm.h" | |
#include "apr_thread_proc.h" | |
#include "apr_strings.h" | |
#include "apr_portable.h" | |
#ifdef HAVE_PWD_H | |
#include <pwd.h> | |
#endif | |
#ifdef HAVE_SYS_RESOURCE_H | |
#include <sys/resource.h> | |
#endif | |
/* XXX */ | |
#include <sys/stat.h> | |
#ifdef HAVE_UNISTD_H | |
#include <unistd.h> | |
#endif | |
#ifdef HAVE_GRP_H | |
#include <grp.h> | |
#endif | |
#ifdef HAVE_STRINGS_H | |
#include <strings.h> | |
#endif | |
#ifdef HAVE_SYS_SEM_H | |
#include <sys/sem.h> | |
#endif | |
#ifdef HAVE_SYS_PRCTL_H | |
#include <sys/prctl.h> | |
#endif | |
unixd_config_rec ap_unixd_config; | |
APLOG_USE_MODULE(core); | |
AP_DECLARE(void) ap_unixd_set_rlimit(cmd_parms *cmd, struct rlimit **plimit, | |
const char *arg, | |
const char * arg2, int type) | |
{ | |
#if (defined(RLIMIT_CPU) || defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_NPROC) || defined(RLIMIT_AS)) && APR_HAVE_STRUCT_RLIMIT && APR_HAVE_GETRLIMIT | |
char *str; | |
struct rlimit *limit; | |
/* If your platform doesn't define rlim_t then typedef it in ap_config.h */ | |
rlim_t cur = 0; | |
rlim_t max = 0; | |
*plimit = (struct rlimit *)apr_pcalloc(cmd->pool, sizeof(**plimit)); | |
limit = *plimit; | |
if ((getrlimit(type, limit)) != 0) { | |
*plimit = NULL; | |
ap_log_error(APLOG_MARK, APLOG_ERR, errno, cmd->server, APLOGNO(02172) | |
"%s: getrlimit failed", cmd->cmd->name); | |
return; | |
} | |
if ((str = ap_getword_conf(cmd->pool, &arg))) { | |
if (!strcasecmp(str, "max")) { | |
cur = limit->rlim_max; | |
} | |
else { | |
cur = atol(str); | |
} | |
} | |
else { | |
ap_log_error(APLOG_MARK, APLOG_ERR, 0, cmd->server, APLOGNO(02173) | |
"Invalid parameters for %s", cmd->cmd->name); | |
return; | |
} | |
if (arg2 && (str = ap_getword_conf(cmd->pool, &arg2))) { | |
max = atol(str); | |
} | |
/* if we aren't running as root, cannot increase max */ | |
if (geteuid()) { | |
limit->rlim_cur = cur; | |
if (max && (max > limit->rlim_max)) { | |
ap_log_error(APLOG_MARK, APLOG_ERR, 0, cmd->server, APLOGNO(02174) | |
"Must be uid 0 to raise maximum %s", cmd->cmd->name); | |
} | |
else if (max) { | |
limit->rlim_max = max; | |
} | |
} | |
else { | |
if (cur) { | |
limit->rlim_cur = cur; | |
} | |
if (max) { | |
limit->rlim_max = max; | |
} | |
} | |
#else | |
ap_log_error(APLOG_MARK, APLOG_ERR, 0, cmd->server, APLOGNO(02175) | |
"Platform does not support rlimit for %s", cmd->cmd->name); | |
#endif | |
} | |
APR_HOOK_STRUCT( | |
APR_HOOK_LINK(get_suexec_identity) | |
) | |
AP_IMPLEMENT_HOOK_RUN_FIRST(ap_unix_identity_t *, get_suexec_identity, | |
(const request_rec *r), (r), NULL) | |
static apr_status_t ap_unix_create_privileged_process( | |
apr_proc_t *newproc, const char *progname, | |
const char * const *args, | |
const char * const *env, | |
apr_procattr_t *attr, ap_unix_identity_t *ugid, | |
apr_pool_t *p) | |
{ | |
int i = 0; | |
const char **newargs; | |
char *newprogname; | |
char *execuser, *execgroup; | |
const char *argv0; | |
if (!ap_unixd_config.suexec_enabled) { | |
return apr_proc_create(newproc, progname, args, env, attr, p); | |
} | |
argv0 = ap_strrchr_c(progname, '/'); | |
/* Allow suexec's "/" check to succeed */ | |
if (argv0 != NULL) { | |
argv0++; | |
} | |
else { | |
argv0 = progname; | |
} | |
if (ugid->userdir) { | |
execuser = apr_psprintf(p, "~%ld", (long) ugid->uid); | |
} | |
else { | |
execuser = apr_psprintf(p, "%ld", (long) ugid->uid); | |
} | |
execgroup = apr_psprintf(p, "%ld", (long) ugid->gid); | |
if (!execuser || !execgroup) { | |
return APR_ENOMEM; | |
} | |
i = 0; | |
while (args[i]) | |
i++; | |
/* allocate space for 4 new args, the input args, and a null terminator */ | |
newargs = apr_palloc(p, sizeof(char *) * (i + 4)); | |
newprogname = SUEXEC_BIN; | |
newargs[0] = SUEXEC_BIN; | |
newargs[1] = execuser; | |
newargs[2] = execgroup; | |
newargs[3] = apr_pstrdup(p, argv0); | |
/* | |
** using a shell to execute suexec makes no sense thus | |
** we force everything to be APR_PROGRAM, and never | |
** APR_SHELLCMD | |
*/ | |
if(apr_procattr_cmdtype_set(attr, APR_PROGRAM) != APR_SUCCESS) { | |
return APR_EGENERAL; | |
} | |
i = 1; | |
do { | |
newargs[i + 3] = args[i]; | |
} while (args[i++]); | |
return apr_proc_create(newproc, newprogname, newargs, env, attr, p); | |
} | |
AP_DECLARE(apr_status_t) ap_os_create_privileged_process( | |
const request_rec *r, | |
apr_proc_t *newproc, const char *progname, | |
const char * const *args, | |
const char * const *env, | |
apr_procattr_t *attr, apr_pool_t *p) | |
{ | |
ap_unix_identity_t *ugid = ap_run_get_suexec_identity(r); | |
if (ugid == NULL) { | |
return apr_proc_create(newproc, progname, args, env, attr, p); | |
} | |
return ap_unix_create_privileged_process(newproc, progname, args, env, | |
attr, ugid, p); | |
} | |
/* XXX move to APR and externalize (but implement differently :) ) */ | |
static apr_lockmech_e proc_mutex_mech(apr_proc_mutex_t *pmutex) | |
{ | |
const char *mechname = apr_proc_mutex_name(pmutex); | |
if (!strcmp(mechname, "sysvsem")) { | |
return APR_LOCK_SYSVSEM; | |
} | |
else if (!strcmp(mechname, "flock")) { | |
return APR_LOCK_FLOCK; | |
} | |
return APR_LOCK_DEFAULT; | |
} | |
AP_DECLARE(apr_status_t) ap_unixd_set_proc_mutex_perms(apr_proc_mutex_t *pmutex) | |
{ | |
if (!geteuid()) { | |
apr_lockmech_e mech = proc_mutex_mech(pmutex); | |
switch(mech) { | |
#if APR_HAS_SYSVSEM_SERIALIZE | |
case APR_LOCK_SYSVSEM: | |
{ | |
apr_os_proc_mutex_t ospmutex; | |
#if !APR_HAVE_UNION_SEMUN | |
union semun { | |
long val; | |
struct semid_ds *buf; | |
unsigned short *array; | |
}; | |
#endif | |
union semun ick; | |
struct semid_ds buf = { { 0 } }; | |
apr_os_proc_mutex_get(&ospmutex, pmutex); | |
buf.sem_perm.uid = ap_unixd_config.user_id; | |
buf.sem_perm.gid = ap_unixd_config.group_id; | |
buf.sem_perm.mode = 0600; | |
ick.buf = &buf; | |
if (semctl(ospmutex.crossproc, 0, IPC_SET, ick) < 0) { | |
return errno; | |
} | |
} | |
break; | |
#endif | |
#if APR_HAS_FLOCK_SERIALIZE | |
case APR_LOCK_FLOCK: | |
{ | |
const char *lockfile = apr_proc_mutex_lockfile(pmutex); | |
if (lockfile) { | |
if (chown(lockfile, ap_unixd_config.user_id, | |
-1 /* no gid change */) < 0) { | |
return errno; | |
} | |
} | |
} | |
break; | |
#endif | |
default: | |
/* do nothing */ | |
break; | |
} | |
} | |
return APR_SUCCESS; | |
} | |
AP_DECLARE(apr_status_t) ap_unixd_set_global_mutex_perms(apr_global_mutex_t *gmutex) | |
{ | |
#if !APR_PROC_MUTEX_IS_GLOBAL | |
apr_os_global_mutex_t osgmutex; | |
apr_os_global_mutex_get(&osgmutex, gmutex); | |
return ap_unixd_set_proc_mutex_perms(osgmutex.proc_mutex); | |
#else /* APR_PROC_MUTEX_IS_GLOBAL */ | |
/* In this case, apr_proc_mutex_t and apr_global_mutex_t are the same. */ | |
return ap_unixd_set_proc_mutex_perms(gmutex); | |
#endif /* APR_PROC_MUTEX_IS_GLOBAL */ | |
} | |
AP_DECLARE(apr_status_t) ap_unixd_accept(void **accepted, ap_listen_rec *lr, | |
apr_pool_t *ptrans) | |
{ | |
apr_socket_t *csd; | |
apr_status_t status; | |
#ifdef _OSD_POSIX | |
int sockdes; | |
#endif | |
*accepted = NULL; | |
status = apr_socket_accept(&csd, lr->sd, ptrans); | |
if (status == APR_SUCCESS) { | |
*accepted = csd; | |
#ifdef _OSD_POSIX | |
apr_os_sock_get(&sockdes, csd); | |
if (sockdes >= FD_SETSIZE) { | |
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(02176) | |
"new file descriptor %d is too large; you probably need " | |
"to rebuild Apache with a larger FD_SETSIZE " | |
"(currently %d)", | |
sockdes, FD_SETSIZE); | |
apr_socket_close(csd); | |
return APR_EINTR; | |
} | |
#endif | |
return APR_SUCCESS; | |
} | |
if (APR_STATUS_IS_EINTR(status)) { | |
return status; | |
} | |
/* Our old behaviour here was to continue after accept() | |
* errors. But this leads us into lots of troubles | |
* because most of the errors are quite fatal. For | |
* example, EMFILE can be caused by slow descriptor | |
* leaks (say in a 3rd party module, or libc). It's | |
* foolish for us to continue after an EMFILE. We also | |
* seem to tickle kernel bugs on some platforms which | |
* lead to never-ending loops here. So it seems best | |
* to just exit in most cases. | |
*/ | |
switch (status) { | |
#if defined(HPUX11) && defined(ENOBUFS) | |
/* On HPUX 11.x, the 'ENOBUFS, No buffer space available' | |
* error occurs because the accept() cannot complete. | |
* You will not see ENOBUFS with 10.20 because the kernel | |
* hides any occurrence from being returned to user space. | |
* ENOBUFS with 11.x's TCP/IP stack is possible, and could | |
* occur intermittently. As a work-around, we are going to | |
* ignore ENOBUFS. | |
*/ | |
case ENOBUFS: | |
#endif | |
#ifdef EPROTO | |
/* EPROTO on certain older kernels really means | |
* ECONNABORTED, so we need to ignore it for them. | |
* See discussion in new-httpd archives nh.9701 | |
* search for EPROTO. | |
* | |
* Also see nh.9603, search for EPROTO: | |
* There is potentially a bug in Solaris 2.x x<6, | |
* and other boxes that implement tcp sockets in | |
* userland (i.e. on top of STREAMS). On these | |
* systems, EPROTO can actually result in a fatal | |
* loop. See PR#981 for example. It's hard to | |
* handle both uses of EPROTO. | |
*/ | |
case EPROTO: | |
#endif | |
#ifdef ECONNABORTED | |
case ECONNABORTED: | |
#endif | |
/* Linux generates the rest of these, other tcp | |
* stacks (i.e. bsd) tend to hide them behind | |
* getsockopt() interfaces. They occur when | |
* the net goes sour or the client disconnects | |
* after the three-way handshake has been done | |
* in the kernel but before userland has picked | |
* up the socket. | |
*/ | |
#ifdef ECONNRESET | |
case ECONNRESET: | |
#endif | |
#ifdef ETIMEDOUT | |
case ETIMEDOUT: | |
#endif | |
#ifdef EHOSTUNREACH | |
case EHOSTUNREACH: | |
#endif | |
#ifdef ENETUNREACH | |
case ENETUNREACH: | |
#endif | |
/* EAGAIN/EWOULDBLOCK can be returned on BSD-derived | |
* TCP stacks when the connection is aborted before | |
* we call connect, but only because our listener | |
* sockets are non-blocking (AP_NONBLOCK_WHEN_MULTI_LISTEN) | |
*/ | |
#ifdef EAGAIN | |
case EAGAIN: | |
#endif | |
#ifdef EWOULDBLOCK | |
#if !defined(EAGAIN) || EAGAIN != EWOULDBLOCK | |
case EWOULDBLOCK: | |
#endif | |
#endif | |
break; | |
#ifdef ENETDOWN | |
case ENETDOWN: | |
/* | |
* When the network layer has been shut down, there | |
* is not much use in simply exiting: the parent | |
* would simply re-create us (and we'd fail again). | |
* Use the CHILDFATAL code to tear the server down. | |
* @@@ Martin's idea for possible improvement: | |
* A different approach would be to define | |
* a new APEXIT_NETDOWN exit code, the reception | |
* of which would make the parent shutdown all | |
* children, then idle-loop until it detected that | |
* the network is up again, and restart the children. | |
* Ben Hyde noted that temporary ENETDOWN situations | |
* occur in mobile IP. | |
*/ | |
ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(02177) | |
"apr_socket_accept: giving up."); | |
return APR_EGENERAL; | |
#endif /*ENETDOWN*/ | |
default: | |
/* If the socket has been closed in ap_close_listeners() | |
* by the restart/stop action, we may get EBADF. | |
* Do not print an error in this case. | |
*/ | |
if (!lr->active) { | |
ap_log_error(APLOG_MARK, APLOG_DEBUG, status, ap_server_conf, APLOGNO(02178) | |
"apr_socket_accept failed for inactive listener"); | |
return status; | |
} | |
ap_log_error(APLOG_MARK, APLOG_ERR, status, ap_server_conf, APLOGNO(02179) | |
"apr_socket_accept: (client socket)"); | |
return APR_EGENERAL; | |
} | |
return status; | |
} | |
#ifdef _OSD_POSIX | |
#include "apr_lib.h" | |
#define USER_LEN 8 | |
typedef enum | |
{ | |
bs2_unknown, /* not initialized yet. */ | |
bs2_noFORK, /* no fork() because -X flag was specified */ | |
bs2_FORK, /* only fork() because uid != 0 */ | |
bs2_UFORK /* Normally, ufork() is used to switch identities. */ | |
} bs2_ForkType; | |
static bs2_ForkType forktype = bs2_unknown; | |
/* Determine the method for forking off a child in such a way as to | |
* set both the POSIX and BS2000 user id's to the unprivileged user. | |
*/ | |
static bs2_ForkType os_forktype(int one_process) | |
{ | |
/* have we checked the OS version before? If yes return the previous | |
* result - the OS release isn't going to change suddenly! | |
*/ | |
if (forktype == bs2_unknown) { | |
/* not initialized yet */ | |
/* No fork if the one_process option was set */ | |
if (one_process) { | |
forktype = bs2_noFORK; | |
} | |
/* If the user is unprivileged, use the normal fork() only. */ | |
else if (getuid() != 0) { | |
forktype = bs2_FORK; | |
} | |
else | |
forktype = bs2_UFORK; | |
} | |
return forktype; | |
} | |
/* This routine complements the setuid() call: it causes the BS2000 job | |
* environment to be switched to the target user's user id. | |
* That is important if CGI scripts try to execute native BS2000 commands. | |
*/ | |
int os_init_job_environment(server_rec *server, const char *user_name, int one_process) | |
{ | |
bs2_ForkType type = os_forktype(one_process); | |
/* We can be sure that no change to uid==0 is possible because of | |
* the checks in http_core.c:set_user() | |
*/ | |
if (one_process) { | |
type = forktype = bs2_noFORK; | |
ap_log_error(APLOG_MARK, APLOG_ERR, 0, server, APLOGNO(02180) | |
"The debug mode of Apache should only " | |
"be started by an unprivileged user!"); | |
return 0; | |
} | |
return 0; | |
} | |
/* BS2000 requires a "special" version of fork() before a setuid() call */ | |
pid_t os_fork(const char *user) | |
{ | |
pid_t pid; | |
char username[USER_LEN+1]; | |
switch (os_forktype(0)) { | |
case bs2_FORK: | |
pid = fork(); | |
break; | |
case bs2_UFORK: | |
apr_cpystrn(username, user, sizeof username); | |
/* Make user name all upper case - for some versions of ufork() */ | |
ap_str_toupper(username); | |
pid = ufork(username); | |
if (pid == -1 && errno == EPERM) { | |
ap_log_error(APLOG_MARK, APLOG_EMERG, errno, | |
ap_server_conf, APLOGNO(02181) "ufork: Possible mis-configuration " | |
"for user %s - Aborting.", user); | |
exit(1); | |
} | |
break; | |
default: | |
pid = 0; | |
break; | |
} | |
return pid; | |
} | |
#endif /* _OSD_POSIX */ |