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454 lines
9.9 KiB
454 lines
9.9 KiB
/*
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*
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* $Id$
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*
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* This file is part of the KDE project, module tdesu.
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* Copyright (C) 1999,2000 Geert Jansen <jansen@kde.org>
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*
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* This is free software; you can use this library under the GNU Library
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* General Public License, version 2. See the file "COPYING.LIB" for the
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* exact licensing terms.
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*
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* client.cpp: A client for tdesud.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <pwd.h>
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#include <errno.h>
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#include <string.h>
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#ifdef HAVE_UCRED_H
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#include <ucred.h>
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#endif /* HAVE_UCRED_H */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/stat.h>
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#include <tqglobal.h>
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#include <tqcstring.h>
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#include <tqfile.h>
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#include <tqregexp.h>
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#include <kdebug.h>
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#include <kstandarddirs.h>
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#include <tdeapplication.h>
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#include <kde_file.h>
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#include "client.h"
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class TDEsuClient::TDEsuClientPrivate {
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public:
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TQString daemon;
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};
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#ifndef SUN_LEN
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#define SUN_LEN(ptr) ((socklen_t) (((struct sockaddr_un *) 0)->sun_path) \
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+ strlen ((ptr)->sun_path))
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#endif
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TDEsuClient::TDEsuClient()
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{
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sockfd = -1;
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#ifdef TQ_WS_X11
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TQCString display(getenv("DISPLAY"));
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if (display.isEmpty())
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{
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kdWarning(900) << k_lineinfo << "$DISPLAY is not set\n";
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return;
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}
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// strip the screen number from the display
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display.replace(TQRegExp("\\.[0-9]+$"), "");
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#else
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TQCString display("QWS");
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#endif
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sock = TQFile::encodeName(locateLocal("socket", TQString("tdesud_%1").arg(display.data())));
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d = new TDEsuClientPrivate;
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connect();
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}
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TDEsuClient::~TDEsuClient()
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{
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delete d;
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if (sockfd >= 0)
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close(sockfd);
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}
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int TDEsuClient::connect()
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{
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if (sockfd >= 0)
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close(sockfd);
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if (access(sock, R_OK|W_OK))
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{
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sockfd = -1;
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return -1;
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}
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sockfd = socket(PF_UNIX, SOCK_STREAM, 0);
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if (sockfd < 0)
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{
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kdWarning(900) << k_lineinfo << "socket(): " << perror << "\n";
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return -1;
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}
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struct sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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strcpy(addr.sun_path, sock);
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if (::connect(sockfd, (struct sockaddr *) &addr, SUN_LEN(&addr)) < 0)
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{
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kdWarning(900) << k_lineinfo << "connect():" << perror << endl;
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close(sockfd); sockfd = -1;
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return -1;
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}
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#if !defined(SO_PEERCRED) || !defined(HAVE_STRUCT_UCRED)
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# if defined(HAVE_GETPEEREID)
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uid_t euid;
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gid_t egid;
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// Security: if socket exists, we must own it
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if (getpeereid(sockfd, &euid, &egid) == 0)
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{
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if (euid != getuid())
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{
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kdWarning(900) << "socket not owned by me! socket uid = " << euid << endl;
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close(sockfd); sockfd = -1;
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return -1;
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}
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}
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# else
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# ifdef __GNUC__
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# warning "Using sloppy security checks"
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# endif
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// We check the owner of the socket after we have connected.
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// If the socket was somehow not ours an attacker will be able
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// to delete it after we connect but shouldn't be able to
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// create a socket that is owned by us.
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KDE_struct_stat s;
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if (KDE_lstat(sock, &s)!=0)
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{
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kdWarning(900) << "stat failed (" << sock << ")" << endl;
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close(sockfd); sockfd = -1;
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return -1;
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}
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if (s.st_uid != getuid())
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{
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kdWarning(900) << "socket not owned by me! socket uid = " << s.st_uid << endl;
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close(sockfd); sockfd = -1;
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return -1;
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}
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if (!S_ISSOCK(s.st_mode))
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{
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kdWarning(900) << "socket is not a socket (" << sock << ")" << endl;
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close(sockfd); sockfd = -1;
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return -1;
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}
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# endif
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#elif defined(HAVE_GETPEERUCRED)
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ucred_t *cred = nullptr;
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if (getpeerucred(sockfd, &cred) == 0) {
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uid_t peer_uid = ucred_geteuid(cred);
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ucred_free(cred);
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if (peer_uid != getuid()) {
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kdWarning(900) << "socket not owned by me! socket uid = " << peer_uid << endl;
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close(sockfd); sockfd = -1;
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return -1;
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}
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}
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if (cred != nullptr)
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ucred_free(cred);
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#else
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struct ucred cred;
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socklen_t siz = sizeof(cred);
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// Security: if socket exists, we must own it
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if (getsockopt(sockfd, SOL_SOCKET, SO_PEERCRED, &cred, &siz) == 0)
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{
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if (cred.uid != getuid())
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{
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kdWarning(900) << "socket not owned by me! socket uid = " << cred.uid << endl;
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close(sockfd); sockfd = -1;
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return -1;
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}
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}
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#endif
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return 0;
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}
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TQCString TDEsuClient::escape(const TQCString &str)
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{
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TQCString copy = str;
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int n = 0;
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while ((n = copy.find("\\", n)) != -1)
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{
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copy.insert(n, '\\');
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n += 2;
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}
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n = 0;
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while ((n = copy.find("\"", n)) != -1)
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{
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copy.insert(n, '\\');
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n += 2;
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}
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copy.prepend("\"");
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copy.append("\"");
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return copy;
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}
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int TDEsuClient::command(const TQCString &cmd, TQCString *result)
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{
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if (sockfd < 0)
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return -1;
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if (send(sockfd, cmd, cmd.length(), 0) != (int) cmd.length())
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return -1;
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char buf[1024];
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int nbytes = recv(sockfd, buf, 1023, 0);
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if (nbytes <= 0)
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{
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kdWarning(900) << k_lineinfo << "no reply from daemon\n";
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return -1;
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}
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buf[nbytes] = '\000';
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TQCString reply = buf;
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if (reply.left(2) != "OK")
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return -1;
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if (result)
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*result = reply.mid(3, reply.length()-4);
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return 0;
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}
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int TDEsuClient::setPass(const char *pass, int timeout)
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{
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TQCString cmd = "PASS ";
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cmd += escape(pass);
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cmd += " ";
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cmd += TQCString().setNum(timeout);
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cmd += "\n";
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return command(cmd);
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}
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int TDEsuClient::exec(const TQCString &prog, const TQCString &user, const TQCString &options, const QCStringList &env)
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{
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TQCString cmd;
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cmd = "EXEC ";
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cmd += escape(prog);
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cmd += " ";
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cmd += escape(user);
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if (!options.isEmpty() || !env.isEmpty())
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{
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cmd += " ";
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cmd += escape(options);
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for(QCStringList::ConstIterator it = env.begin();
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it != env.end(); ++it)
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{
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cmd += " ";
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cmd += escape(*it);
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}
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}
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cmd += "\n";
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return command(cmd);
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}
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int TDEsuClient::setHost(const TQCString &host)
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{
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TQCString cmd = "HOST ";
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cmd += escape(host);
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cmd += "\n";
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return command(cmd);
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}
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int TDEsuClient::setPriority(int prio)
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{
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TQCString cmd;
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cmd.sprintf("PRIO %d\n", prio);
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return command(cmd);
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}
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int TDEsuClient::setScheduler(int sched)
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{
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TQCString cmd;
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cmd.sprintf("SCHD %d\n", sched);
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return command(cmd);
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}
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int TDEsuClient::delCommand(const TQCString &key, const TQCString &user)
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{
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TQCString cmd = "DEL ";
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cmd += escape(key);
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cmd += " ";
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cmd += escape(user);
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cmd += "\n";
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return command(cmd);
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}
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int TDEsuClient::setVar(const TQCString &key, const TQCString &value, int timeout,
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const TQCString &group)
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{
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TQCString cmd = "SET ";
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cmd += escape(key);
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cmd += " ";
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cmd += escape(value);
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cmd += " ";
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cmd += escape(group);
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cmd += " ";
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cmd += TQCString().setNum(timeout);
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cmd += "\n";
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return command(cmd);
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}
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TQCString TDEsuClient::getVar(const TQCString &key)
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{
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TQCString cmd = "GET ";
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cmd += escape(key);
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cmd += "\n";
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TQCString reply;
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command(cmd, &reply);
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return reply;
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}
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TQValueList<TQCString> TDEsuClient::getKeys(const TQCString &group)
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{
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TQCString cmd = "GETK ";
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cmd += escape(group);
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cmd += "\n";
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TQCString reply;
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command(cmd, &reply);
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int index=0, pos;
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TQValueList<TQCString> list;
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if( !reply.isEmpty() )
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{
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// kdDebug(900) << "Found a matching entry: " << reply << endl;
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while (1)
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{
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pos = reply.find( '\007', index );
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if( pos == -1 )
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{
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if( index == 0 )
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list.append( reply );
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else
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list.append( reply.mid(index) );
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break;
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}
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else
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{
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list.append( reply.mid(index, pos-index) );
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}
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index = pos+1;
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}
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}
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return list;
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}
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bool TDEsuClient::findGroup(const TQCString &group)
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{
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TQCString cmd = "CHKG ";
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cmd += escape(group);
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cmd += "\n";
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if( command(cmd) == -1 )
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return false;
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return true;
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}
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int TDEsuClient::delVar(const TQCString &key)
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{
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TQCString cmd = "DELV ";
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cmd += escape(key);
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cmd += "\n";
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return command(cmd);
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}
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int TDEsuClient::delGroup(const TQCString &group)
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{
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TQCString cmd = "DELG ";
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cmd += escape(group);
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cmd += "\n";
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return command(cmd);
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}
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int TDEsuClient::delVars(const TQCString &special_key)
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{
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TQCString cmd = "DELS ";
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cmd += escape(special_key);
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cmd += "\n";
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return command(cmd);
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}
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int TDEsuClient::ping()
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{
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return command("PING\n");
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}
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int TDEsuClient::exitCode()
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{
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TQCString result;
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if (command("EXIT\n", &result) != 0)
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return -1;
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return result.toLong();
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}
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int TDEsuClient::stopServer()
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{
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return command("STOP\n");
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}
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static TQString findDaemon()
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{
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TQString daemon = locate("bin", "tdesud");
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if (daemon.isEmpty()) // if not in TDEDIRS, rely on PATH
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daemon = TDEStandardDirs::findExe("tdesud");
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if (daemon.isEmpty())
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{
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kdWarning(900) << k_lineinfo << "daemon not found\n";
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}
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return daemon;
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}
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bool TDEsuClient::isServerSGID()
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{
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if (d->daemon.isEmpty())
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d->daemon = findDaemon();
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if (d->daemon.isEmpty())
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return false;
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KDE_struct_stat sbuf;
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if (KDE_stat(TQFile::encodeName(d->daemon), &sbuf) < 0)
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{
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kdWarning(900) << k_lineinfo << "stat(): " << perror << "\n";
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return false;
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}
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return (sbuf.st_mode & S_ISGID);
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}
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int TDEsuClient::startServer()
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{
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if (d->daemon.isEmpty())
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d->daemon = findDaemon();
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if (d->daemon.isEmpty())
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return -1;
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if (!isServerSGID()) {
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kdWarning(900) << k_lineinfo << "tdesud not setgid!\n";
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}
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// tdesud only forks to the background after it is accepting
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// connections.
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// We start it via tdeinit to make sure that it doesn't inherit
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// any fd's from the parent process.
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int ret = kapp->tdeinitExecWait(d->daemon);
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connect();
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return ret;
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}
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