You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
433 lines
9.4 KiB
433 lines
9.4 KiB
/*
|
|
*
|
|
* $Id$
|
|
*
|
|
* This file is part of the KDE project, module tdesu.
|
|
* Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
|
|
*
|
|
* tdesu_stub.c: KDE su executes this stub through su or ssh. This stub in turn
|
|
* executes the target program. Before that, startup parameters
|
|
* are sent through stdin.
|
|
*
|
|
*
|
|
* Available parameters:
|
|
*
|
|
* Parameter Description Format (csl = comma separated list)
|
|
*
|
|
* - tdesu_stub Header "ok" | "stop"
|
|
* - display X11 display string
|
|
* - display_auth X11 authentication "type cookie" pair
|
|
* - dcopserver KDE dcopserver csl of netids
|
|
* - dcop_auth DCOP authentication csl of "type cookie" pairs for DCOP
|
|
* - ice_auth ICE authentication csl of "type cookie" pairs for ICE
|
|
* - command Command to run string
|
|
* - path PATH env. var string
|
|
* - build_sycoca Rebuild sycoca? "yes" | "no"
|
|
* - user Target user string
|
|
* - priority Process priority 0 <= int <= 100
|
|
* - scheduler Process scheduler "fifo" | "normal"
|
|
* - app_startup_id DESKTOP_STARTUP_ID string
|
|
* - environment Additional envvars strings, last one is empty
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <pwd.h>
|
|
#include <termios.h>
|
|
#include <signal.h>
|
|
|
|
#ifdef HAVE_INITGROUPS
|
|
#include <grp.h>
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
|
|
#ifdef POSIX1B_SCHEDULING
|
|
#include <sched.h>
|
|
#endif
|
|
|
|
/**
|
|
* Params sent by the peer.
|
|
*/
|
|
|
|
struct param_struct
|
|
{
|
|
const char *name;
|
|
char *value;
|
|
};
|
|
|
|
struct param_struct params[] =
|
|
{
|
|
{ "tdesu_stub", 0L },
|
|
{ "display", 0L },
|
|
{ "display_auth", 0L },
|
|
{ "dcopserver", 0L },
|
|
{ "dcop_auth", 0L },
|
|
{ "ice_auth", 0L },
|
|
{ "command", 0L },
|
|
{ "path", 0L },
|
|
{ "xwindows_only", 0L },
|
|
{ "user", 0L },
|
|
{ "priority", 0L },
|
|
{ "scheduler", 0L },
|
|
/* obsoleted by app_startup_id { "app_start_pid", 0L } */
|
|
{ "app_startup_id", 0L }
|
|
};
|
|
|
|
#define P_HEADER 0
|
|
#define P_DISPLAY 1
|
|
#define P_DISPLAY_AUTH 2
|
|
#define P_DCOPSERVER 3
|
|
#define P_DCOP_AUTH 4
|
|
#define P_ICE_AUTH 5
|
|
#define P_COMMAND 6
|
|
#define P_PATH 7
|
|
#define P_XWIN_ONLY 8
|
|
#define P_USER 9
|
|
#define P_PRIORITY 10
|
|
#define P_SCHEDULER 11
|
|
#define P_APP_STARTUP_ID 12
|
|
#define P_LAST 13
|
|
|
|
/* Prototypes */
|
|
char *xmalloc(size_t);
|
|
char *xrealloc(char *ptr, int size);
|
|
int xsetenv(const char *name, const char *value);
|
|
char *xstrdup(char *src);
|
|
char **xstrsep(char *str);
|
|
|
|
/**
|
|
* Safe malloc functions.
|
|
*/
|
|
char *xmalloc(size_t size)
|
|
{
|
|
char *ptr = malloc(size);
|
|
if (ptr) return ptr;
|
|
perror("malloc()");
|
|
exit(1);
|
|
}
|
|
|
|
|
|
char *xrealloc(char *ptr, int size)
|
|
{
|
|
ptr = realloc(ptr, size);
|
|
if (ptr) return ptr;
|
|
perror("realloc()");
|
|
exit(1);
|
|
}
|
|
|
|
|
|
/**
|
|
* Solaris does not have a setenv()...
|
|
*/
|
|
int xsetenv(const char *name, const char *value)
|
|
{
|
|
char *s = malloc(strlen(name)+strlen(value)+2);
|
|
if (!s) return -1;
|
|
strcpy(s, name);
|
|
strcat(s, "=");
|
|
strcat(s, value);
|
|
return putenv(s); /* yes: no free()! */
|
|
}
|
|
|
|
/**
|
|
* Safe strdup and strip newline
|
|
*/
|
|
char *xstrdup(char *src)
|
|
{
|
|
int len = strlen(src);
|
|
char *dst = xmalloc(len+1);
|
|
strcpy(dst, src);
|
|
if (dst[len-1] == '\n')
|
|
dst[len-1] = '\000';
|
|
return dst;
|
|
}
|
|
|
|
/**
|
|
* Split comma separated list.
|
|
*/
|
|
char **xstrsep(char *str)
|
|
{
|
|
int i = 0, size = 10;
|
|
char **list = (char **) xmalloc(size * sizeof(char *));
|
|
char *ptr = str, *nptr;
|
|
while ((nptr = strchr(ptr, ',')) != 0L)
|
|
{
|
|
if (i > size-2)
|
|
list = realloc(list, (size *= 2) * sizeof(char *));
|
|
*nptr = '\000';
|
|
list[i++] = ptr;
|
|
ptr = nptr+1;
|
|
}
|
|
if (*ptr != '\000')
|
|
list[i++] = ptr;
|
|
list[i] = 0L;
|
|
return list;
|
|
}
|
|
|
|
#define BUFSIZE 8192
|
|
|
|
/**
|
|
* The main program
|
|
*/
|
|
|
|
int main()
|
|
{
|
|
char buf[BUFSIZE+1];
|
|
#ifndef QWS
|
|
char xauthority[200];
|
|
#endif
|
|
char iceauthority[200];
|
|
char **host, **auth;
|
|
int i/*, res, sycoca*/, prio;
|
|
pid_t pid;
|
|
FILE *fout;
|
|
struct passwd *pw;
|
|
const char* tdesu_lc_all;
|
|
|
|
/* Get startup parameters. */
|
|
|
|
for (i=0; i<P_LAST; i++)
|
|
{
|
|
printf("%s\n", params[i].name);
|
|
fflush(stdout);
|
|
if (fgets(buf, BUFSIZE, stdin) == 0L)
|
|
{
|
|
printf("end\n"); fflush(stdout);
|
|
perror("tdesu_stub: fgets()");
|
|
exit(1);
|
|
}
|
|
params[i].value = xstrdup(buf);
|
|
/* Installation check? */
|
|
if ((i == 0) && !strcmp(params[i].value, "stop"))
|
|
{
|
|
printf("end\n");
|
|
exit(0);
|
|
}
|
|
}
|
|
printf("environment\n");
|
|
fflush(stdout);
|
|
for(;;)
|
|
{
|
|
char* tmp;
|
|
if (fgets(buf, BUFSIZE, stdin) == 0L)
|
|
{
|
|
printf("end\n"); fflush(stdout);
|
|
perror("tdesu_stub: fgets()");
|
|
exit(1);
|
|
}
|
|
tmp = xstrdup( buf );
|
|
if( tmp[ 0 ] == '\0' ) /* terminator */
|
|
break;
|
|
putenv( xstrdup( buf ));
|
|
}
|
|
|
|
printf("end\n");
|
|
fflush(stdout);
|
|
|
|
xsetenv("PATH", params[P_PATH].value);
|
|
xsetenv("DESKTOP_STARTUP_ID", params[P_APP_STARTUP_ID].value);
|
|
|
|
tdesu_lc_all = getenv( "TDESU_LC_ALL" );
|
|
if( tdesu_lc_all != NULL )
|
|
xsetenv("LC_ALL",tdesu_lc_all);
|
|
else
|
|
unsetenv("LC_ALL");
|
|
|
|
/* Do we need to change uid? */
|
|
|
|
pw = getpwnam(params[P_USER].value);
|
|
if (pw == 0L)
|
|
{
|
|
printf("tdesu_stub: user %s does not exist!\n", params[P_USER].value);
|
|
exit(1);
|
|
}
|
|
xsetenv("HOME", pw->pw_dir);
|
|
|
|
/* Set scheduling/priority */
|
|
|
|
prio = atoi(params[P_PRIORITY].value);
|
|
if (!strcmp(params[P_SCHEDULER].value, "realtime"))
|
|
{
|
|
#ifdef POSIX1B_SCHEDULING
|
|
struct sched_param sched;
|
|
int min = sched_get_priority_min(SCHED_FIFO);
|
|
int max = sched_get_priority_max(SCHED_FIFO);
|
|
sched.sched_priority = min + (int) (((double) prio) * (max - min) / 100 + 0.5);
|
|
sched_setscheduler(0, SCHED_FIFO, &sched);
|
|
#else
|
|
printf("tdesu_stub: realtime scheduling not supported\n");
|
|
#endif
|
|
} else
|
|
{
|
|
#ifdef HAVE_SETPRIORITY
|
|
int val = 20 - (int) (((double) prio) * 40 / 100 + 0.5);
|
|
setpriority(PRIO_PROCESS, getpid(), val);
|
|
#endif
|
|
}
|
|
|
|
/* Drop privileges (this is permanent) */
|
|
|
|
if (getuid() != pw->pw_uid)
|
|
{
|
|
if (setgid(pw->pw_gid) == -1)
|
|
{
|
|
perror("tdesu_stub: setgid()");
|
|
exit(1);
|
|
}
|
|
#ifdef HAVE_INITGROUPS
|
|
if (initgroups(pw->pw_name, pw->pw_gid) == -1)
|
|
{
|
|
perror("tdesu_stub: initgroups()");
|
|
exit(1);
|
|
}
|
|
#endif
|
|
if (setuid(pw->pw_uid) == -1)
|
|
{
|
|
perror("tdesu_stub: setuid()");
|
|
exit(1);
|
|
}
|
|
xsetenv("HOME", pw->pw_dir);
|
|
}
|
|
|
|
/* Handle display */
|
|
|
|
if (strcmp(params[P_DISPLAY].value, "no"))
|
|
{
|
|
#ifndef QWS
|
|
xsetenv("DISPLAY", params[P_DISPLAY].value);
|
|
if (params[P_DISPLAY_AUTH].value[0])
|
|
{
|
|
int fd2;
|
|
/*
|
|
** save umask and set to 077, so we create those files only
|
|
** readable for root. (if someone else could read them, we
|
|
** are in deep shit).
|
|
*/
|
|
int oldumask = umask(077);
|
|
const char *disp = params[P_DISPLAY].value;
|
|
if (strncmp(disp, "localhost:", 10) == 0)
|
|
disp += 9;
|
|
|
|
strcpy(xauthority, "/tmp/xauth.XXXXXXXXXX");
|
|
fd2 = mkstemp(xauthority);
|
|
umask(oldumask);
|
|
|
|
if (fd2 == -1) {
|
|
perror("tdesu_stub: mkstemp()");
|
|
exit(1);
|
|
} else
|
|
close(fd2);
|
|
xsetenv("XAUTHORITY", xauthority);
|
|
|
|
fout = popen("xauth >/dev/null 2>&1","w");
|
|
if (fout == NULL)
|
|
{
|
|
perror("tdesu_stub: popen(xauth)");
|
|
exit(1);
|
|
}
|
|
fprintf(fout, "add %s %s\n", disp,
|
|
params[P_DISPLAY_AUTH].value);
|
|
pclose(fout);
|
|
}
|
|
#else
|
|
xsetenv("DISPLAY", params[P_DISPLAY].value);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* Handle DCOP */
|
|
|
|
if (strcmp(params[P_DCOPSERVER].value, "no"))
|
|
{
|
|
xsetenv("DCOPSERVER", params[P_DCOPSERVER].value);
|
|
host = xstrsep(params[P_DCOPSERVER].value);
|
|
auth = xstrsep(params[P_ICE_AUTH].value);
|
|
if (host[0])
|
|
{
|
|
int fd;
|
|
int oldumask = umask(077);
|
|
|
|
strcpy(iceauthority, "/tmp/iceauth.XXXXXXXXXX");
|
|
fd = mkstemp(iceauthority);
|
|
umask(oldumask);
|
|
if (fd == -1) {
|
|
perror("tdesu_stub: mkstemp()");
|
|
exit(1);
|
|
} else
|
|
close(fd);
|
|
xsetenv("ICEAUTHORITY", iceauthority);
|
|
|
|
fout = popen(ICEAUTH_COMMAND " >/dev/null 2>&1", "w");
|
|
if (!fout) {
|
|
perror("tdesu_stub: popen " ICEAUTH_COMMAND);
|
|
exit(1);
|
|
}
|
|
for (i=0; host[i]; i++)
|
|
fprintf(fout, "add ICE \"\" %s %s\n", host[i], auth[i]);
|
|
auth = xstrsep(params[P_DCOP_AUTH].value);
|
|
for (i=0; host[i]; i++)
|
|
fprintf(fout, "add DCOP \"\" %s %s\n", host[i], auth[i]);
|
|
pclose(fout);
|
|
}
|
|
}
|
|
|
|
/* Rebuild the sycoca and start tdeinit? */
|
|
|
|
if (strcmp(params[P_XWIN_ONLY].value, "no"))
|
|
{
|
|
system("tdeinit --suicide");
|
|
}
|
|
|
|
/* Execute the command */
|
|
|
|
pid = fork();
|
|
if (pid == -1)
|
|
{
|
|
perror("tdesu_stub: fork()");
|
|
exit(1);
|
|
}
|
|
if (pid)
|
|
{
|
|
/* Parent: wait for child, delete tempfiles and return. */
|
|
int ret, state, xit = 1;
|
|
while (1)
|
|
{
|
|
ret = waitpid(pid, &state, 0);
|
|
if (ret == -1)
|
|
{
|
|
if (errno == EINTR)
|
|
continue;
|
|
if (errno != ECHILD)
|
|
perror("tdesu_stub: waitpid()");
|
|
break;
|
|
}
|
|
if (WIFEXITED(state))
|
|
xit = WEXITSTATUS(state);
|
|
}
|
|
|
|
#ifndef QWS
|
|
unlink(xauthority);
|
|
#endif
|
|
unlink(iceauthority);
|
|
exit(xit);
|
|
} else
|
|
{
|
|
setsid();
|
|
/* Child: exec command. */
|
|
sprintf(buf, "%s", params[P_COMMAND].value);
|
|
execl("/bin/sh", "sh", "-c", buf, (void *)0);
|
|
perror("tdesu_stub: exec()");
|
|
_exit(1);
|
|
}
|
|
}
|