1078172a77
a size_t as its 3rd argument, which is 64-bits on the alpha. The 'len' variable used was a int, which is only 32-bits. Use size_t as the type for 'len' to work-around this.
771 lines
18 KiB
C
771 lines
18 KiB
C
/*-
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* Copyright (c) 1983, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/filio.h>
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#include <sys/ioccom.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/ucred.h>
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#include <sys/uio.h>
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#include <sys/utsname.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "inetd.h"
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extern int debug;
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extern struct servtab *servtab;
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char ring[128];
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char *endring;
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int check_loop __P((struct sockaddr *, struct servtab *sep));
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void inetd_setproctitle __P((char *, int));
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struct biltin biltins[] = {
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/* Echo received data */
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{ "echo", SOCK_STREAM, 1, -1, echo_stream },
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{ "echo", SOCK_DGRAM, 0, 1, echo_dg },
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/* Internet /dev/null */
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{ "discard", SOCK_STREAM, 1, -1, discard_stream },
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{ "discard", SOCK_DGRAM, 0, 1, discard_dg },
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/* Return 32 bit time since 1970 */
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{ "time", SOCK_STREAM, 0, -1, machtime_stream },
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{ "time", SOCK_DGRAM, 0, 1, machtime_dg },
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/* Return human-readable time */
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{ "daytime", SOCK_STREAM, 0, -1, daytime_stream },
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{ "daytime", SOCK_DGRAM, 0, 1, daytime_dg },
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/* Familiar character generator */
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{ "chargen", SOCK_STREAM, 1, -1, chargen_stream },
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{ "chargen", SOCK_DGRAM, 0, 1, chargen_dg },
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{ "tcpmux", SOCK_STREAM, 1, -1, (void (*)())tcpmux },
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{ "auth", SOCK_STREAM, 1, -1, ident_stream },
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{ NULL }
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};
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/*
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* RFC864 Character Generator Protocol. Generates character data without
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* any regard for input.
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*/
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void
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initring()
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{
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int i;
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endring = ring;
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for (i = 0; i <= 128; ++i)
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if (isprint(i))
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*endring++ = i;
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}
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/* ARGSUSED */
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void
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chargen_dg(s, sep) /* Character generator */
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int s;
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struct servtab *sep;
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{
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struct sockaddr_storage ss;
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static char *rs;
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int len;
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socklen_t size;
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char text[LINESIZ+2];
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if (endring == 0) {
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initring();
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rs = ring;
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}
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size = sizeof(ss);
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if (recvfrom(s, text, sizeof(text), 0,
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(struct sockaddr *)&ss, &size) < 0)
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return;
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if (check_loop((struct sockaddr *)&ss, sep))
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return;
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if ((len = endring - rs) >= LINESIZ)
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memmove(text, rs, LINESIZ);
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else {
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memmove(text, rs, len);
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memmove(text + len, ring, LINESIZ - len);
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}
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if (++rs == endring)
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rs = ring;
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text[LINESIZ] = '\r';
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text[LINESIZ + 1] = '\n';
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(void) sendto(s, text, sizeof(text), 0, (struct sockaddr *)&ss, size);
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}
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/* ARGSUSED */
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void
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chargen_stream(s, sep) /* Character generator */
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int s;
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struct servtab *sep;
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{
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int len;
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char *rs, text[LINESIZ+2];
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inetd_setproctitle(sep->se_service, s);
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if (!endring) {
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initring();
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rs = ring;
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}
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text[LINESIZ] = '\r';
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text[LINESIZ + 1] = '\n';
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for (rs = ring;;) {
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if ((len = endring - rs) >= LINESIZ)
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memmove(text, rs, LINESIZ);
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else {
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memmove(text, rs, len);
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memmove(text + len, ring, LINESIZ - len);
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}
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if (++rs == endring)
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rs = ring;
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if (write(s, text, sizeof(text)) != sizeof(text))
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break;
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}
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exit(0);
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}
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/*
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* RFC867 Daytime Protocol. Sends the current date and time as an ascii
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* character string without any regard for input.
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*/
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/* ARGSUSED */
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void
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daytime_dg(s, sep) /* Return human-readable time of day */
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int s;
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struct servtab *sep;
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{
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char buffer[256];
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time_t clock;
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struct sockaddr_storage ss;
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socklen_t size;
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clock = time((time_t *) 0);
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size = sizeof(ss);
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if (recvfrom(s, buffer, sizeof(buffer), 0,
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(struct sockaddr *)&ss, &size) < 0)
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return;
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if (check_loop((struct sockaddr *)&ss, sep))
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return;
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(void) sprintf(buffer, "%.24s\r\n", ctime(&clock));
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(void) sendto(s, buffer, strlen(buffer), 0,
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(struct sockaddr *)&ss, size);
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}
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/* ARGSUSED */
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void
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daytime_stream(s, sep) /* Return human-readable time of day */
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int s;
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struct servtab *sep;
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{
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char buffer[256];
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time_t clock;
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clock = time((time_t *) 0);
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(void) sprintf(buffer, "%.24s\r\n", ctime(&clock));
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(void) send(s, buffer, strlen(buffer), MSG_EOF);
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}
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/*
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* RFC863 Discard Protocol. Any data received is thrown away and no response
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* is sent.
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*/
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/* ARGSUSED */
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void
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discard_dg(s, sep) /* Discard service -- ignore data */
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int s;
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struct servtab *sep;
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{
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char buffer[BUFSIZE];
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(void) read(s, buffer, sizeof(buffer));
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}
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/* ARGSUSED */
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void
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discard_stream(s, sep) /* Discard service -- ignore data */
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int s;
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struct servtab *sep;
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{
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int ret;
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char buffer[BUFSIZE];
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inetd_setproctitle(sep->se_service, s);
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while (1) {
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while ((ret = read(s, buffer, sizeof(buffer))) > 0)
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;
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if (ret == 0 || errno != EINTR)
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break;
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}
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exit(0);
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}
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/*
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* RFC862 Echo Protocol. Any data received is sent back to the sender as
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* received.
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*/
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/* ARGSUSED */
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void
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echo_dg(s, sep) /* Echo service -- echo data back */
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int s;
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struct servtab *sep;
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{
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char buffer[BUFSIZE];
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int i;
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socklen_t size;
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struct sockaddr_storage ss;
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size = sizeof(ss);
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if ((i = recvfrom(s, buffer, sizeof(buffer), 0,
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(struct sockaddr *)&ss, &size)) < 0)
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return;
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if (check_loop((struct sockaddr *)&ss, sep))
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return;
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(void) sendto(s, buffer, i, 0, (struct sockaddr *)&ss, size);
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}
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/* ARGSUSED */
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void
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echo_stream(s, sep) /* Echo service -- echo data back */
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int s;
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struct servtab *sep;
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{
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char buffer[BUFSIZE];
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int i;
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inetd_setproctitle(sep->se_service, s);
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while ((i = read(s, buffer, sizeof(buffer))) > 0 &&
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write(s, buffer, i) > 0)
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;
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exit(0);
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}
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/*
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* RFC1413 Identification Protocol. Given a TCP port number pair, return a
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* character string which identifies the owner of that connection on the
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* server's system. Extended to allow for ~/.fakeid support and ~/.noident
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* support.
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*/
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/* ARGSUSED */
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void
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iderror(lport, fport, s, er) /* Generic ident_stream error-sending func */
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int lport, fport, s, er;
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{
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char *p;
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asprintf(&p, "%d , %d : ERROR : %s\r\n", lport, fport,
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er == -1 ? "HIDDEN-USER" : er ? strerror(er) : "UNKNOWN-ERROR");
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if (p == NULL) {
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syslog(LOG_ERR, "asprintf: %m");
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exit(EX_OSERR);
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}
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send(s, p, strlen(p), MSG_EOF);
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free(p);
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exit(0);
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}
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/* ARGSUSED */
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void
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ident_stream(s, sep) /* Ident service (AKA "auth") */
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int s;
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struct servtab *sep;
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{
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struct utsname un;
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struct stat sb;
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struct sockaddr_in sin[2];
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#ifdef INET6
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struct sockaddr_in6 sin6[2];
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#endif
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struct sockaddr_storage ss[2];
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struct ucred uc;
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struct timeval tv = {
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10,
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0
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};
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struct passwd *pw = NULL;
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fd_set fdset;
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char buf[BUFSIZE], *cp = NULL, *p, **av, *osname = NULL, garbage[7];
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char *fallback = NULL;
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size_t len;
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int c, fflag = 0, nflag = 0, rflag = 0, argc = 0, usedfallback = 0;
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int gflag = 0, Rflag = 0, getcredfail = 0;
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u_short lport, fport;
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inetd_setproctitle(sep->se_service, s);
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/*
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* Reset getopt() since we are a fork() but not an exec() from
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* a parent which used getopt() already.
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*/
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optind = 1;
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optreset = 1;
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/*
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* Take the internal argument vector and count it out to make an
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* argument count for getopt. This can be used for any internal
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* service to read arguments and use getopt() easily.
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*/
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for (av = sep->se_argv; *av; av++)
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argc++;
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if (argc) {
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int sec, usec;
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size_t i;
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u_int32_t random;
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while ((c = getopt(argc, sep->se_argv, "d:fgno:rt:")) != -1)
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switch (c) {
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case 'd':
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fallback = optarg;
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break;
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case 'f':
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fflag = 1;
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break;
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case 'g':
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gflag = 1;
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random = 0; /* Shush, compiler. */
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/*
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* The number of bits in "random" divided
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* by the number of bits needed per iteration
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* gives a more optimal way to reload the
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* random number only when necessary.
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*
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* I'm using base-36, so I need at least 6
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* bits; round it up to 8 bits to make it
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* easier.
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*/
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for (i = 0; i < sizeof(garbage) - 1; i++) {
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const char *const base36 =
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"0123456789"
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"abcdefghijklmnopqrstuvwxyz";
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if (i % (sizeof(random) * 8 / 8) == 0)
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random = arc4random();
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garbage[i] =
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base36[(random & 0xff) % 36];
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random >>= 8;
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}
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garbage[i] = '\0';
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break;
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case 'n':
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nflag = 1;
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break;
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case 'o':
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osname = optarg;
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break;
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case 'R':
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Rflag = 2;
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break;
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case 'r':
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rflag = 1;
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break;
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case 't':
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switch (sscanf(optarg, "%d.%d", &sec, &usec)) {
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case 2:
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tv.tv_usec = usec;
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case 1:
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tv.tv_sec = sec;
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break;
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default:
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if (debug)
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warnx("bad -t argument");
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break;
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}
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break;
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default:
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break;
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}
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}
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if (osname == NULL) {
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if (uname(&un) == -1)
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iderror(0, 0, s, errno);
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osname = un.sysname;
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}
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len = sizeof(ss[0]);
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if (getsockname(s, (struct sockaddr *)&ss[0], &len) == -1)
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iderror(0, 0, s, errno);
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len = sizeof(ss[1]);
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if (getpeername(s, (struct sockaddr *)&ss[1], &len) == -1)
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iderror(0, 0, s, errno);
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/*
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* We're going to prepare for and execute reception of a
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* packet of data from the user. The data is in the format
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* "local_port , foreign_port\r\n" (with local being the
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* server's port and foreign being the client's.)
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*/
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FD_ZERO(&fdset);
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FD_SET(s, &fdset);
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if (select(s + 1, &fdset, NULL, NULL, &tv) == -1)
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iderror(0, 0, s, errno);
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if (ioctl(s, FIONREAD, &len) == -1)
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iderror(0, 0, s, errno);
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if (len >= sizeof(buf))
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len = sizeof(buf) - 1;
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len = read(s, buf, len);
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if (len == -1)
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iderror(0, 0, s, errno);
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buf[len] = '\0';
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if (sscanf(buf, "%hu , %hu", &lport, &fport) != 2)
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iderror(0, 0, s, 0);
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if (gflag) {
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cp = garbage;
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goto printit;
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}
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/*
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* If not "real" (-r), send a HIDDEN-USER error for everything.
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* If -d is used to set a fallback username, this is used to
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* override it, and the fallback is returned instead.
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*/
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if (!rflag) {
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if (fallback == NULL)
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iderror(lport, fport, s, -1);
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else {
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cp = fallback;
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goto printit;
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}
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}
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|
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/*
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* We take the input and construct an array of two sockaddr_ins
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* which contain the local address information and foreign
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* address information, respectively, used to look up the
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* credentials for the socket (which are returned by the
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* sysctl "net.inet.tcp.getcred" when we call it.) The
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* arrays have been filled in above via get{peer,sock}name(),
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* so right here we are only setting the ports.
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*/
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if (ss[0].ss_family != ss[1].ss_family)
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iderror(lport, fport, s, errno);
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len = sizeof(uc);
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switch (ss[0].ss_family) {
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case AF_INET:
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sin[0] = *(struct sockaddr_in *)&ss[0];
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sin[0].sin_port = htons(lport);
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sin[1] = *(struct sockaddr_in *)&ss[1];
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sin[1].sin_port = htons(fport);
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if (sysctlbyname("net.inet.tcp.getcred", &uc, &len, sin,
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sizeof(sin)) == -1)
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getcredfail = 1;
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break;
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#ifdef INET6
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case AF_INET6:
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sin6[0] = *(struct sockaddr_in6 *)&ss[0];
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sin6[0].sin6_port = htons(lport);
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sin6[1] = *(struct sockaddr_in6 *)&ss[1];
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sin6[1].sin6_port = htons(fport);
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if (sysctlbyname("net.inet6.tcp6.getcred", &uc, &len, sin6,
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sizeof(sin6)) == -1)
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getcredfail = 1;
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break;
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#endif
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default: /* should not reach here */
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getcredfail = 1;
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break;
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}
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if (getcredfail != 0) {
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if (fallback == NULL) /* Use a default, if asked to */
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iderror(lport, fport, s, errno);
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usedfallback = 1;
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} else {
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/* Look up the pw to get the username */
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pw = getpwuid(uc.cr_uid);
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}
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if (pw == NULL && !usedfallback) /* No such user... */
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iderror(lport, fport, s, errno);
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/*
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* If enabled, we check for a file named ".noident" in the user's
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* home directory. If found, we return HIDDEN-USER.
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|
*/
|
|
if (nflag && !usedfallback) {
|
|
if (asprintf(&p, "%s/.noident", pw->pw_dir) == -1)
|
|
iderror(lport, fport, s, errno);
|
|
if (lstat(p, &sb) == 0) {
|
|
free(p);
|
|
iderror(lport, fport, s, -1);
|
|
}
|
|
free(p);
|
|
}
|
|
/*
|
|
* Here, if enabled, we read a user's ".fakeid" file in their
|
|
* home directory. It consists of a line containing the name
|
|
* they want.
|
|
*/
|
|
if (fflag && !usedfallback) {
|
|
FILE *fakeid = NULL;
|
|
|
|
if (asprintf(&p, "%s/.fakeid", pw->pw_dir) == -1)
|
|
iderror(lport, fport, s, errno);
|
|
/*
|
|
* Here we set ourself to effectively be the user, so we don't
|
|
* open any files we have no permission to open, especially
|
|
* symbolic links to sensitive root-owned files or devices.
|
|
*/
|
|
seteuid(pw->pw_uid);
|
|
setegid(pw->pw_gid);
|
|
/*
|
|
* If we were to lstat() here, it would do no good, since it
|
|
* would introduce a race condition and could be defeated.
|
|
* Therefore, we open the file we have permissions to open
|
|
* and if it's not a regular file, we close it and end up
|
|
* returning the user's real username.
|
|
*/
|
|
fakeid = fopen(p, "r");
|
|
free(p);
|
|
if (fakeid != NULL &&
|
|
fstat(fileno(fakeid), &sb) != -1 && S_ISREG(sb.st_mode)) {
|
|
buf[sizeof(buf) - 1] = '\0';
|
|
if (fgets(buf, sizeof(buf), fakeid) == NULL) {
|
|
cp = pw->pw_name;
|
|
fclose(fakeid);
|
|
goto printit;
|
|
}
|
|
fclose(fakeid);
|
|
/*
|
|
* Usually, the file will have the desired identity
|
|
* in the form "identity\n", so we use strtok() to
|
|
* end the string (which fgets() doesn't do.)
|
|
*/
|
|
strtok(buf, "\r\n");
|
|
/* User names of >16 characters are invalid */
|
|
if (strlen(buf) > 16)
|
|
buf[16] = '\0';
|
|
cp = buf;
|
|
/* Allow for beginning white space... */
|
|
while (isspace(*cp))
|
|
cp++;
|
|
/* ...and ending white space. */
|
|
strtok(cp, " \t");
|
|
/*
|
|
* If the name is a zero-length string or matches
|
|
* the name of another user, it's invalid, so
|
|
* we will return their real identity instead.
|
|
*/
|
|
|
|
if (!*cp || getpwnam(cp))
|
|
cp = getpwuid(uc.cr_uid)->pw_name;
|
|
} else
|
|
cp = pw->pw_name;
|
|
} else if (!usedfallback)
|
|
cp = pw->pw_name;
|
|
else
|
|
cp = fallback;
|
|
printit:
|
|
/* Finally, we make and send the reply. */
|
|
if (asprintf(&p, "%d , %d : USERID : %s : %s\r\n", lport, fport, osname,
|
|
cp) == -1) {
|
|
syslog(LOG_ERR, "asprintf: %m");
|
|
exit(EX_OSERR);
|
|
}
|
|
send(s, p, strlen(p), MSG_EOF);
|
|
free(p);
|
|
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* RFC738 Time Server.
|
|
* Return a machine readable date and time, in the form of the
|
|
* number of seconds since midnight, Jan 1, 1900. Since gettimeofday
|
|
* returns the number of seconds since midnight, Jan 1, 1970,
|
|
* we must add 2208988800 seconds to this figure to make up for
|
|
* some seventy years Bell Labs was asleep.
|
|
*/
|
|
|
|
unsigned long
|
|
machtime()
|
|
{
|
|
struct timeval tv;
|
|
|
|
if (gettimeofday(&tv, (struct timezone *)NULL) < 0) {
|
|
if (debug)
|
|
warnx("unable to get time of day");
|
|
return (0L);
|
|
}
|
|
#define OFFSET ((u_long)25567 * 24*60*60)
|
|
return (htonl((long)(tv.tv_sec + OFFSET)));
|
|
#undef OFFSET
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
machtime_dg(s, sep)
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
unsigned long result;
|
|
struct sockaddr_storage ss;
|
|
socklen_t size;
|
|
|
|
size = sizeof(ss);
|
|
if (recvfrom(s, (char *)&result, sizeof(result), 0,
|
|
(struct sockaddr *)&ss, &size) < 0)
|
|
return;
|
|
|
|
if (check_loop((struct sockaddr *)&ss, sep))
|
|
return;
|
|
|
|
result = machtime();
|
|
(void) sendto(s, (char *) &result, sizeof(result), 0,
|
|
(struct sockaddr *)&ss, size);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
machtime_stream(s, sep)
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
unsigned long result;
|
|
|
|
result = machtime();
|
|
(void) send(s, (char *) &result, sizeof(result), MSG_EOF);
|
|
}
|
|
|
|
/*
|
|
* RFC1078 TCP Port Service Multiplexer (TCPMUX). Service connections to
|
|
* services based on the service name sent.
|
|
*
|
|
* Based on TCPMUX.C by Mark K. Lottor November 1988
|
|
* sri-nic::ps:<mkl>tcpmux.c
|
|
*/
|
|
|
|
#define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */
|
|
#define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1)
|
|
|
|
static int /* # of characters upto \r,\n or \0 */
|
|
getline(fd, buf, len)
|
|
int fd;
|
|
char *buf;
|
|
int len;
|
|
{
|
|
int count = 0, n;
|
|
struct sigaction sa;
|
|
|
|
sa.sa_flags = 0;
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_handler = SIG_DFL;
|
|
sigaction(SIGALRM, &sa, (struct sigaction *)0);
|
|
do {
|
|
alarm(10);
|
|
n = read(fd, buf, len-count);
|
|
alarm(0);
|
|
if (n == 0)
|
|
return (count);
|
|
if (n < 0)
|
|
return (-1);
|
|
while (--n >= 0) {
|
|
if (*buf == '\r' || *buf == '\n' || *buf == '\0')
|
|
return (count);
|
|
count++;
|
|
buf++;
|
|
}
|
|
} while (count < len);
|
|
return (count);
|
|
}
|
|
|
|
struct servtab *
|
|
tcpmux(s)
|
|
int s;
|
|
{
|
|
struct servtab *sep;
|
|
char service[MAX_SERV_LEN+1];
|
|
int len;
|
|
|
|
/* Get requested service name */
|
|
if ((len = getline(s, service, MAX_SERV_LEN)) < 0) {
|
|
strwrite(s, "-Error reading service name\r\n");
|
|
return (NULL);
|
|
}
|
|
service[len] = '\0';
|
|
|
|
if (debug)
|
|
warnx("tcpmux: someone wants %s", service);
|
|
|
|
/*
|
|
* Help is a required command, and lists available services,
|
|
* one per line.
|
|
*/
|
|
if (!strcasecmp(service, "help")) {
|
|
for (sep = servtab; sep; sep = sep->se_next) {
|
|
if (!ISMUX(sep))
|
|
continue;
|
|
(void)write(s,sep->se_service,strlen(sep->se_service));
|
|
strwrite(s, "\r\n");
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/* Try matching a service in inetd.conf with the request */
|
|
for (sep = servtab; sep; sep = sep->se_next) {
|
|
if (!ISMUX(sep))
|
|
continue;
|
|
if (!strcasecmp(service, sep->se_service)) {
|
|
if (ISMUXPLUS(sep)) {
|
|
strwrite(s, "+Go\r\n");
|
|
}
|
|
return (sep);
|
|
}
|
|
}
|
|
strwrite(s, "-Service not available\r\n");
|
|
return (NULL);
|
|
}
|