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-rw-r--r--kdesu/kdesud/kdesud.cpp415
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diff --git a/kdesu/kdesud/kdesud.cpp b/kdesu/kdesud/kdesud.cpp
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+/* vi: ts=8 sts=4 sw=4
+ *
+ * This file is part of the KDE project, module kdesu.
+ * Copyright (C) 1999,2000 Geert Jansen <[email protected]>
+ *
+ *
+ * kdesud.cpp: KDE su daemon. Offers "keep password" functionality to kde su.
+ *
+ * The socket $KDEHOME/socket-$(HOSTNAME)/kdesud_$(display) is used for communication with
+ * client programs.
+ *
+ * The protocol: Client initiates the connection. All commands and responses
+ * are terminated by a newline.
+ *
+ * Client Server Description
+ * ------ ------ -----------
+ *
+ * PASS <pass> <timeout> OK Set password for commands in
+ * this session. Password is
+ * valid for <timeout> seconds.
+ *
+ * USER <user> OK Set the target user [required]
+ *
+ * EXEC <command> OK Execute command <command>. If
+ * NO <command> has been executed
+ * before (< timeout) no PASS
+ * command is needed.
+ *
+ * DEL <command> OK Delete password for command
+ * NO <command>.
+ *
+ * PING OK Ping the server (diagnostics).
+ */
+
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <string.h>
+#include <stdarg.h>
+#include <signal.h>
+#include <pwd.h>
+#include <errno.h>
+
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/resource.h>
+#include <sys/wait.h>
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h> // Needed on some systems.
+#endif
+
+#include <qptrvector.h>
+#include <qfile.h>
+#include <qregexp.h>
+
+#include <kinstance.h>
+#include <kdebug.h>
+#include <klocale.h>
+#include <kcmdlineargs.h>
+#include <kstandarddirs.h>
+#include <kaboutdata.h>
+#include <kdesu/client.h>
+#include <kdesu/defaults.h>
+#include <ksockaddr.h>
+
+#include "repo.h"
+#include "handler.h"
+
+#include <X11/X.h>
+#include <X11/Xlib.h>
+
+#ifndef SUN_LEN
+#define SUN_LEN(ptr) ((kde_socklen_t) (((struct sockaddr_un *) 0)->sun_path) \
+ + strlen ((ptr)->sun_path))
+#endif
+
+#define ERR strerror(errno)
+
+// Globals
+
+Repository *repo;
+const char *Version = "1.01";
+QCString sock;
+Display *x11Display;
+int pipeOfDeath[2];
+
+
+void kdesud_cleanup()
+{
+ unlink(sock);
+}
+
+
+// Borrowed from kdebase/kaudio/kaudioserver.cpp
+
+extern "C" int xio_errhandler(Display *);
+
+int xio_errhandler(Display *)
+{
+ kdError(1205) << "Fatal IO error, exiting...\n";
+ kdesud_cleanup();
+ exit(1);
+ return 1; //silence compilers
+}
+
+int initXconnection()
+{
+ x11Display = XOpenDisplay(NULL);
+ if (x11Display != 0L)
+ {
+ XSetIOErrorHandler(xio_errhandler);
+ XCreateSimpleWindow(x11Display, DefaultRootWindow(x11Display),
+ 0, 0, 1, 1, 0,
+ BlackPixelOfScreen(DefaultScreenOfDisplay(x11Display)),
+ BlackPixelOfScreen(DefaultScreenOfDisplay(x11Display)));
+ return XConnectionNumber(x11Display);
+ } else
+ {
+ kdWarning(1205) << "Can't connect to the X Server.\n";
+ kdWarning(1205) << "Might not terminate at end of session.\n";
+ return -1;
+ }
+}
+
+extern "C" {
+ void signal_exit(int);
+ void sigchld_handler(int);
+}
+
+void signal_exit(int sig)
+{
+ kdDebug(1205) << "Exiting on signal " << sig << "\n";
+ kdesud_cleanup();
+ exit(1);
+}
+
+void sigchld_handler(int)
+{
+ char c = ' ';
+ write(pipeOfDeath[1], &c, 1);
+}
+
+/**
+ * Creates an AF_UNIX socket in socket resource, mode 0600.
+ */
+
+int create_socket()
+{
+ int sockfd;
+ ksocklen_t addrlen;
+ struct stat s;
+
+ QCString display(getenv("DISPLAY"));
+ if (display.isEmpty())
+ {
+ kdWarning(1205) << "$DISPLAY is not set\n";
+ return -1;
+ }
+
+ // strip the screen number from the display
+ display.replace(QRegExp("\\.[0-9]+$"), "");
+
+ sock = QFile::encodeName(locateLocal("socket", QString("kdesud_%1").arg(display)));
+ int stat_err=lstat(sock, &s);
+ if(!stat_err && S_ISLNK(s.st_mode)) {
+ kdWarning(1205) << "Someone is running a symlink attack on you\n";
+ if(unlink(sock)) {
+ kdWarning(1205) << "Could not delete symlink\n";
+ return -1;
+ }
+ }
+
+ if (!access(sock, R_OK|W_OK))
+ {
+ KDEsuClient client;
+ if (client.ping() == -1)
+ {
+ kdWarning(1205) << "stale socket exists\n";
+ if (unlink(sock))
+ {
+ kdWarning(1205) << "Could not delete stale socket\n";
+ return -1;
+ }
+ } else
+ {
+ kdWarning(1205) << "kdesud is already running\n";
+ return -1;
+ }
+
+ }
+
+ sockfd = socket(PF_UNIX, SOCK_STREAM, 0);
+ if (sockfd < 0)
+ {
+ kdError(1205) << "socket(): " << ERR << "\n";
+ return -1;
+ }
+
+ struct sockaddr_un addr;
+ addr.sun_family = AF_UNIX;
+ strncpy(addr.sun_path, sock, sizeof(addr.sun_path)-1);
+ addr.sun_path[sizeof(addr.sun_path)-1] = '\000';
+ addrlen = SUN_LEN(&addr);
+ if (bind(sockfd, (struct sockaddr *)&addr, addrlen) < 0)
+ {
+ kdError(1205) << "bind(): " << ERR << "\n";
+ return -1;
+ }
+
+ struct linger lin;
+ lin.l_onoff = lin.l_linger = 0;
+ if (setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (char *) &lin,
+ sizeof(linger)) < 0)
+ {
+ kdError(1205) << "setsockopt(SO_LINGER): " << ERR << "\n";
+ return -1;
+ }
+
+ int opt = 1;
+ if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char *) &opt,
+ sizeof(opt)) < 0)
+ {
+ kdError(1205) << "setsockopt(SO_REUSEADDR): " << ERR << "\n";
+ return -1;
+ }
+ opt = 1;
+ if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, (char *) &opt,
+ sizeof(opt)) < 0)
+ {
+ kdError(1205) << "setsockopt(SO_KEEPALIVE): " << ERR << "\n";
+ return -1;
+ }
+ chmod(sock, 0600);
+ return sockfd;
+}
+
+
+/**
+ * Main program
+ */
+
+int main(int argc, char *argv[])
+{
+ KAboutData aboutData("kdesud", I18N_NOOP("KDE su daemon"),
+ Version, I18N_NOOP("Daemon used by kdesu"),
+ KAboutData::License_Artistic,
+ "Copyright (c) 1999,2000 Geert Jansen");
+ aboutData.addAuthor("Geert Jansen", I18N_NOOP("Author"),
+ "[email protected]", "http://www.stack.nl/~geertj/");
+ KCmdLineArgs::init(argc, argv, &aboutData);
+ KInstance instance(&aboutData);
+
+ // Set core dump size to 0
+ struct rlimit rlim;
+ rlim.rlim_cur = rlim.rlim_max = 0;
+ if (setrlimit(RLIMIT_CORE, &rlim) < 0)
+ {
+ kdError(1205) << "setrlimit(): " << ERR << "\n";
+ exit(1);
+ }
+
+ // Create the Unix socket.
+ int sockfd = create_socket();
+ if (sockfd < 0)
+ exit(1);
+ if (listen(sockfd, 1) < 0)
+ {
+ kdError(1205) << "listen(): " << ERR << "\n";
+ kdesud_cleanup();
+ exit(1);
+ }
+ int maxfd = sockfd;
+
+ // Ok, we're accepting connections. Fork to the background.
+ pid_t pid = fork();
+ if (pid == -1)
+ {
+ kdError(1205) << "fork():" << ERR << "\n";
+ kdesud_cleanup();
+ exit(1);
+ }
+ if (pid)
+ exit(0);
+
+ // Make sure we exit when the display gets closed.
+ int x11Fd = initXconnection();
+ maxfd = QMAX(maxfd, x11Fd);
+
+ repo = new Repository;
+ QPtrVector<ConnectionHandler> handler;
+ handler.setAutoDelete(true);
+
+ pipe(pipeOfDeath);
+ maxfd = QMAX(maxfd, pipeOfDeath[0]);
+
+ // Signal handlers
+ struct sigaction sa;
+ sa.sa_handler = signal_exit;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0;
+ sigaction(SIGHUP, &sa, 0L);
+ sigaction(SIGINT, &sa, 0L);
+ sigaction(SIGTERM, &sa, 0L);
+ sigaction(SIGQUIT, &sa, 0L);
+
+ sa.sa_handler = sigchld_handler;
+ sa.sa_flags = SA_NOCLDSTOP;
+ sigaction(SIGCHLD, &sa, 0L);
+ sa.sa_handler = SIG_IGN;
+ sigaction(SIGPIPE, &sa, 0L);
+
+ // Main execution loop
+
+ ksocklen_t addrlen;
+ struct sockaddr_un clientname;
+
+ fd_set tmp_fds, active_fds;
+ FD_ZERO(&active_fds);
+ FD_SET(sockfd, &active_fds);
+ FD_SET(pipeOfDeath[0], &active_fds);
+ if (x11Fd != -1)
+ FD_SET(x11Fd, &active_fds);
+
+ while (1)
+ {
+ tmp_fds = active_fds;
+ if(x11Display)
+ XFlush(x11Display);
+ if (select(maxfd+1, &tmp_fds, 0L, 0L, 0L) < 0)
+ {
+ if (errno == EINTR) continue;
+
+ kdError(1205) << "select(): " << ERR << "\n";
+ exit(1);
+ }
+ repo->expire();
+ for (int i=0; i<=maxfd; i++)
+ {
+ if (!FD_ISSET(i, &tmp_fds))
+ continue;
+
+ if (i == pipeOfDeath[0])
+ {
+ char buf[101];
+ read(pipeOfDeath[0], buf, 100);
+ pid_t result;
+ do
+ {
+ int status;
+ result = waitpid((pid_t)-1, &status, WNOHANG);
+ if (result > 0)
+ {
+ for(int j=handler.size(); j--;)
+ {
+ if (handler[j] && (handler[j]->m_pid == result))
+ {
+ handler[j]->m_exitCode = WEXITSTATUS(status);
+ handler[j]->m_hasExitCode = true;
+ handler[j]->sendExitCode();
+ handler[j]->m_pid = 0;
+ break;
+ }
+ }
+ }
+ }
+ while(result > 0);
+ }
+
+ if (i == x11Fd)
+ {
+ // Discard X events
+ XEvent event_return;
+ if (x11Display)
+ while(XPending(x11Display))
+ XNextEvent(x11Display, &event_return);
+ continue;
+ }
+
+ if (i == sockfd)
+ {
+ // Accept new connection
+ int fd;
+ addrlen = 64;
+ fd = accept(sockfd, (struct sockaddr *) &clientname, &addrlen);
+ if (fd < 0)
+ {
+ kdError(1205) << "accept():" << ERR << "\n";
+ continue;
+ }
+ if (fd+1 > (int) handler.size())
+ handler.resize(fd+1);
+ handler.insert(fd, new ConnectionHandler(fd));
+ maxfd = QMAX(maxfd, fd);
+ FD_SET(fd, &active_fds);
+ continue;
+ }
+
+ // handle alreay established connection
+ if (handler[i] && handler[i]->handle() < 0)
+ {
+ handler.remove(i);
+ FD_CLR(i, &active_fds);
+ }
+ }
+ }
+ kdWarning(1205) << "???\n";
+}
+
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