mirror of
https://github.com/apache/httpd.git
synced 2025-08-03 16:33:59 +00:00
Strip down mod_unixd to only do chroot and changing the UID.
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@709058 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Paul Querna
@ -19,7 +19,6 @@
|
||||
#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"
|
||||
@ -50,8 +49,23 @@
|
||||
#include <sys/prctl.h>
|
||||
#endif
|
||||
|
||||
unixd_config_rec unixd_config;
|
||||
int unixd_status = 0;
|
||||
|
||||
#ifndef DEFAULT_USER
|
||||
#define DEFAULT_USER "#-1"
|
||||
#endif
|
||||
#ifndef DEFAULT_GROUP
|
||||
#define DEFAULT_GROUP "#-1"
|
||||
#endif
|
||||
|
||||
typedef struct {
|
||||
const char *user_name;
|
||||
uid_t user_id;
|
||||
gid_t group_id;
|
||||
const char *chroot_dir;
|
||||
} unixd_config_t;
|
||||
|
||||
|
||||
unixd_config_t unixd_config;
|
||||
|
||||
/* Set group privileges.
|
||||
*
|
||||
@ -112,10 +126,10 @@ static int set_group_privs(void)
|
||||
}
|
||||
|
||||
|
||||
static void unixd_setup_child(apr_pool_t *pool, server_rec *s)
|
||||
static void
|
||||
unixd_setup_child(apr_pool_t *pool, server_rec *s)
|
||||
{
|
||||
if (set_group_privs()) {
|
||||
unixd_status = -1;
|
||||
return;
|
||||
}
|
||||
|
||||
@ -123,25 +137,21 @@ static void unixd_setup_child(apr_pool_t *pool, server_rec *s)
|
||||
if (geteuid()) {
|
||||
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
|
||||
"Cannot chroot when not started as root");
|
||||
unixd_status = -1;
|
||||
return;
|
||||
}
|
||||
if (chdir(unixd_config.chroot_dir) != 0) {
|
||||
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
|
||||
"Can't chdir to %s", unixd_config.chroot_dir);
|
||||
unixd_status = -1;
|
||||
return;
|
||||
}
|
||||
if (chroot(unixd_config.chroot_dir) != 0) {
|
||||
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
|
||||
"Can't chroot to %s", unixd_config.chroot_dir);
|
||||
unixd_status = -1;
|
||||
return;
|
||||
}
|
||||
if (chdir("/") != 0) {
|
||||
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
|
||||
"Can't chdir to new root");
|
||||
unixd_status = -1;
|
||||
return;
|
||||
}
|
||||
}
|
||||
@ -169,7 +179,6 @@ static void unixd_setup_child(apr_pool_t *pool, server_rec *s)
|
||||
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
|
||||
"setuid: unable to change to uid: %ld",
|
||||
(long) unixd_config.user_id);
|
||||
unixd_status = -1;
|
||||
return;
|
||||
}
|
||||
#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
|
||||
@ -185,7 +194,6 @@ static void unixd_setup_child(apr_pool_t *pool, server_rec *s)
|
||||
#endif
|
||||
#endif
|
||||
#endif
|
||||
unixd_status = 0;
|
||||
}
|
||||
|
||||
|
||||
@ -216,7 +224,8 @@ AP_DECLARE(const char *) unixd_set_user(cmd_parms *cmd, void *dummy,
|
||||
return NULL;
|
||||
}
|
||||
|
||||
AP_DECLARE(const char *) unixd_set_group(cmd_parms *cmd, void *dummy,
|
||||
static const char*
|
||||
unixd_set_group(cmd_parms *cmd, void *dummy,
|
||||
const char *arg)
|
||||
{
|
||||
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
||||
@ -228,8 +237,10 @@ AP_DECLARE(const char *) unixd_set_group(cmd_parms *cmd, void *dummy,
|
||||
|
||||
return NULL;
|
||||
}
|
||||
AP_DECLARE(const char *) unixd_set_chroot_dir(cmd_parms *cmd, void *dummy,
|
||||
const char *arg)
|
||||
|
||||
static const char*
|
||||
unixd_set_chroot_dir(cmd_parms *cmd, void *dummy,
|
||||
const char *arg)
|
||||
{
|
||||
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
|
||||
if (err != NULL) {
|
||||
@ -243,540 +254,34 @@ AP_DECLARE(const char *) unixd_set_chroot_dir(cmd_parms *cmd, void *dummy,
|
||||
return NULL;
|
||||
}
|
||||
|
||||
AP_DECLARE(void) unixd_pre_config(apr_pool_t *ptemp)
|
||||
static int
|
||||
unixd_pre_config(apr_pool_t *pconf, apr_pool_t *plog,
|
||||
apr_pool_t *ptemp)
|
||||
{
|
||||
apr_finfo_t wrapper;
|
||||
|
||||
unixd_config.user_name = DEFAULT_USER;
|
||||
unixd_config.user_id = ap_uname2id(DEFAULT_USER);
|
||||
unixd_config.group_id = ap_gname2id(DEFAULT_GROUP);
|
||||
|
||||
|
||||
unixd_config.chroot_dir = NULL; /* none */
|
||||
|
||||
/* Check for suexec */
|
||||
unixd_config.suexec_enabled = 0;
|
||||
if ((apr_stat(&wrapper, SUEXEC_BIN,
|
||||
APR_FINFO_NORM, ptemp)) != APR_SUCCESS) {
|
||||
return;
|
||||
}
|
||||
|
||||
if ((wrapper.protection & APR_USETID) && wrapper.user == 0) {
|
||||
unixd_config.suexec_enabled = 1;
|
||||
}
|
||||
return OK;
|
||||
}
|
||||
|
||||
|
||||
AP_DECLARE(void) 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,
|
||||
"%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,
|
||||
"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) {
|
||||
ap_log_error(APLOG_MARK, APLOG_ERR, 0, cmd->server,
|
||||
"Must be uid 0 to raise maximum %s", cmd->cmd->name);
|
||||
}
|
||||
}
|
||||
else {
|
||||
if (cur) {
|
||||
limit->rlim_cur = cur;
|
||||
}
|
||||
if (max) {
|
||||
limit->rlim_max = max;
|
||||
}
|
||||
}
|
||||
#else
|
||||
|
||||
ap_log_error(APLOG_MARK, APLOG_ERR, 0, cmd->server,
|
||||
"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 (!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;
|
||||
if (args) {
|
||||
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) 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;
|
||||
|
||||
apr_os_proc_mutex_get(&ospmutex, pmutex);
|
||||
buf.sem_perm.uid = unixd_config.user_id;
|
||||
buf.sem_perm.gid = 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, 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) 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 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 unixd_set_proc_mutex_perms(gmutex);
|
||||
#endif /* APR_PROC_MUTEX_IS_GLOBAL */
|
||||
}
|
||||
|
||||
AP_DECLARE(apr_status_t) 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, NULL,
|
||||
"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,
|
||||
"apr_socket_accept: giving up.");
|
||||
return APR_EGENERAL;
|
||||
#endif /*ENETDOWN*/
|
||||
|
||||
#ifdef TPF
|
||||
case EINACT:
|
||||
ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf,
|
||||
"offload device inactive");
|
||||
return APR_EGENERAL;
|
||||
break;
|
||||
default:
|
||||
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf,
|
||||
"select/accept error (%d)", status);
|
||||
return APR_EGENERAL;
|
||||
#else
|
||||
default:
|
||||
#ifdef _OSD_POSIX /* Possibly on other platforms too */
|
||||
/* 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 && status == EBADF)
|
||||
return status;
|
||||
#endif
|
||||
ap_log_error(APLOG_MARK, APLOG_ERR, status, ap_server_conf,
|
||||
"apr_socket_accept: (client socket)");
|
||||
return APR_EGENERAL;
|
||||
#endif
|
||||
}
|
||||
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;
|
||||
|
||||
|
||||
static void ap_str_toupper(char *str)
|
||||
{
|
||||
while (*str) {
|
||||
*str = apr_toupper(*str);
|
||||
++str;
|
||||
}
|
||||
}
|
||||
|
||||
/* 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,
|
||||
"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,
|
||||
NULL, "ufork: Possible mis-configuration "
|
||||
"for user %s - Aborting.", user);
|
||||
exit(1);
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
pid = 0;
|
||||
break;
|
||||
}
|
||||
|
||||
return pid;
|
||||
}
|
||||
|
||||
#endif /* _OSD_POSIX */
|
||||
|
||||
static void unixd_hooks(apr_pool_t *pool)
|
||||
{
|
||||
ap_hook_pre_config(unixd_pre_config,
|
||||
NULL, NULL, APR_HOOK_FIRST);
|
||||
|
||||
ap_hook_child_init(unixd_setup_child, NULL, NULL, APR_HOOK_FIRST);
|
||||
}
|
||||
|
||||
static const command_rec unixd_cmds[] = {
|
||||
UNIX_DAEMON_COMMANDS,
|
||||
AP_INIT_TAKE1("User", unixd_set_user, NULL, RSRC_CONF,
|
||||
"Effective user id for this server"),
|
||||
AP_INIT_TAKE1("Group", unixd_set_group, NULL, RSRC_CONF,
|
||||
"Effective group id for this server"),
|
||||
AP_INIT_TAKE1("ChrootDir", unixd_set_chroot_dir, NULL, RSRC_CONF,
|
||||
"The directory to chroot(2) into"),
|
||||
{NULL}
|
||||
};
|
||||
|
||||
|
||||
Reference in New Issue
Block a user