393 lines
9.1 KiB
C
393 lines
9.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1980, 1993
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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__SCCSID("@(#)rexec.c 8.1 (Berkeley) 6/4/93");
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <netdb.h>
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#include <errno.h>
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#include <ctype.h>
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#include <err.h>
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#include <stdlib.h>
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#include <unistd.h>
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int rexecoptions;
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char *getpass(), *getlogin();
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/*
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* Options and other state info.
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*/
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struct macel {
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char mac_name[9]; /* macro name */
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char *mac_start; /* start of macro in macbuf */
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char *mac_end; /* end of macro in macbuf */
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};
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int macnum; /* number of defined macros */
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struct macel macros[16];
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char macbuf[4096];
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static FILE *cfile;
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#define DEFAULT 1
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#define LOGIN 2
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#define PASSWD 3
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#define ACCOUNT 4
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#define MACDEF 5
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#define ID 10
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#define MACH 11
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static char tokval[100];
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static struct toktab {
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char *tokstr;
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int tval;
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} toktab[]= {
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{ "default", DEFAULT },
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{ "login", LOGIN },
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{ "password", PASSWD },
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{ "passwd", PASSWD },
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{ "account", ACCOUNT },
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{ "machine", MACH },
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{ "macdef", MACDEF },
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{ NULL, 0 }
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};
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static int
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token()
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{
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char *cp;
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int c;
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struct toktab *t;
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if (feof(cfile) || ferror(cfile))
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return (0);
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while ((c = getc(cfile)) != EOF &&
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(c == '\n' || c == '\t' || c == ' ' || c == ','))
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continue;
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if (c == EOF)
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return (0);
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cp = tokval;
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if (c == '"') {
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while ((c = getc(cfile)) != EOF && c != '"') {
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if (c == '\\')
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c = getc(cfile);
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*cp++ = c;
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}
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} else {
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*cp++ = c;
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while ((c = getc(cfile)) != EOF
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&& c != '\n' && c != '\t' && c != ' ' && c != ',') {
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if (c == '\\')
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c = getc(cfile);
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*cp++ = c;
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}
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}
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*cp = 0;
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if (tokval[0] == 0)
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return (0);
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for (t = toktab; t->tokstr; t++)
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if (!strcmp(t->tokstr, tokval))
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return (t->tval);
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return (ID);
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}
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static int
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ruserpass(host, aname, apass, aacct)
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char *host, **aname, **apass, **aacct;
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{
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char *hdir, buf[BUFSIZ], *tmp;
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char myname[MAXHOSTNAMELEN], *mydomain;
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int t, i, c, usedefault = 0;
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struct stat stb;
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hdir = getenv("HOME");
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if (hdir == NULL)
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hdir = ".";
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if (strlen(hdir) + 8 > sizeof(buf))
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return (0);
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(void) sprintf(buf, "%s/.netrc", hdir);
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cfile = fopen(buf, "r");
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if (cfile == NULL) {
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if (errno != ENOENT)
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warn("%s", buf);
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return (0);
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}
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if (gethostname(myname, sizeof(myname)) < 0)
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myname[0] = '\0';
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if ((mydomain = strchr(myname, '.')) == NULL)
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mydomain = "";
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next:
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while ((t = token())) switch(t) {
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case DEFAULT:
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usedefault = 1;
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/* FALL THROUGH */
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case MACH:
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if (!usedefault) {
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if (token() != ID)
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continue;
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/*
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* Allow match either for user's input host name
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* or official hostname. Also allow match of
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* incompletely-specified host in local domain.
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*/
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if (strcasecmp(host, tokval) == 0)
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goto match;
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if ((tmp = strchr(host, '.')) != NULL &&
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strcasecmp(tmp, mydomain) == 0 &&
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strncasecmp(host, tokval, tmp - host) == 0 &&
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tokval[tmp - host] == '\0')
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goto match;
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continue;
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}
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match:
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while ((t = token()) && t != MACH && t != DEFAULT) switch(t) {
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case LOGIN:
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if (token())
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if (*aname == NULL) {
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*aname = malloc((unsigned) strlen(tokval) + 1);
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(void) strcpy(*aname, tokval);
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} else {
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if (strcmp(*aname, tokval))
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goto next;
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}
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break;
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case PASSWD:
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if ((*aname == NULL || strcmp(*aname, "anonymous")) &&
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fstat(fileno(cfile), &stb) >= 0 &&
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(stb.st_mode & 077) != 0) {
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warnx("Error: .netrc file is readable by others.");
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warnx("Remove password or make file unreadable by others.");
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goto bad;
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}
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if (token() && *apass == NULL) {
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*apass = malloc((unsigned) strlen(tokval) + 1);
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(void) strcpy(*apass, tokval);
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}
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break;
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case ACCOUNT:
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if (fstat(fileno(cfile), &stb) >= 0
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&& (stb.st_mode & 077) != 0) {
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warnx("Error: .netrc file is readable by others.");
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warnx("Remove account or make file unreadable by others.");
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goto bad;
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}
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if (token() && *aacct == NULL) {
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*aacct = malloc((unsigned) strlen(tokval) + 1);
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(void) strcpy(*aacct, tokval);
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}
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break;
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case MACDEF:
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while ((c=getc(cfile)) != EOF &&
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(c == ' ' || c == '\t'))
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;
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if (c == EOF || c == '\n') {
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printf("Missing macdef name argument.\n");
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goto bad;
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}
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if (macnum == 16) {
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printf("Limit of 16 macros have already been defined\n");
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goto bad;
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}
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tmp = macros[macnum].mac_name;
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*tmp++ = c;
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for (i=0; i < 8 && (c=getc(cfile)) != EOF &&
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!isspace(c); ++i) {
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*tmp++ = c;
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}
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if (c == EOF) {
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printf("Macro definition missing null line terminator.\n");
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goto bad;
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}
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*tmp = '\0';
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if (c != '\n') {
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while ((c=getc(cfile)) != EOF && c != '\n');
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}
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if (c == EOF) {
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printf("Macro definition missing null line terminator.\n");
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goto bad;
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}
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if (macnum == 0) {
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macros[macnum].mac_start = macbuf;
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}
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else {
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macros[macnum].mac_start = macros[macnum-1].mac_end + 1;
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}
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tmp = macros[macnum].mac_start;
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while (tmp != macbuf + 4096) {
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if ((c=getc(cfile)) == EOF) {
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printf("Macro definition missing null line terminator.\n");
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goto bad;
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}
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*tmp = c;
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if (*tmp == '\n') {
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if (*(tmp-1) == '\0') {
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macros[macnum++].mac_end = tmp - 1;
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break;
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}
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*tmp = '\0';
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}
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tmp++;
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}
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if (tmp == macbuf + 4096) {
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printf("4K macro buffer exceeded\n");
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goto bad;
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}
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break;
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default:
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warnx("Unknown .netrc keyword %s", tokval);
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break;
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}
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goto done;
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}
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done:
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(void) fclose(cfile);
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return (0);
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bad:
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(void) fclose(cfile);
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return (-1);
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}
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int
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rexec(ahost, rport, name, pass, cmd, fd2p)
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char **ahost;
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int rport;
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char *name, *pass, *cmd;
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int *fd2p;
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{
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struct sockaddr_in sin, sin2, from;
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struct hostent *hp;
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u_short port;
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int s, timo = 1, s3;
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char c, *acct;
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hp = gethostbyname(*ahost);
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if (hp == NULL) {
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herror(*ahost);
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return (-1);
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}
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*ahost = hp->h_name;
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acct = NULL;
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ruserpass(hp->h_name, &name, &pass, &acct);
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free(acct);
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retry:
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s = socket(AF_INET, SOCK_STREAM, 0);
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if (s < 0) {
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perror("rexec: socket");
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return (-1);
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}
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sin.sin_family = hp->h_addrtype;
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sin.sin_port = rport;
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bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
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if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
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if (errno == ECONNREFUSED && timo <= 16) {
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(void) close(s);
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sleep(timo);
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timo *= 2;
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goto retry;
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}
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perror(hp->h_name);
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(void) close(s);
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return (-1);
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}
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port = 0;
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if (fd2p == 0)
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(void) write(s, "", 1);
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else {
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char num[8];
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int s2, sin2len;
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s2 = socket(AF_INET, SOCK_STREAM, 0);
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if (s2 < 0) {
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(void) close(s);
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return (-1);
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}
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listen(s2, 1);
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sin2len = sizeof (sin2);
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if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
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sin2len != sizeof (sin2)) {
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perror("getsockname");
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(void) close(s2);
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goto bad;
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}
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port = ntohs((u_short)sin2.sin_port);
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(void) sprintf(num, "%hu", port);
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(void) write(s, num, strlen(num)+1);
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{ int len = sizeof (from);
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s3 = accept(s2, (struct sockaddr *)&from, &len);
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close(s2);
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if (s3 < 0) {
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perror("accept");
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port = 0;
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goto bad;
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}
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}
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*fd2p = s3;
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}
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(void) write(s, name, strlen(name) + 1);
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/* should public key encypt the password here */
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(void) write(s, pass, strlen(pass) + 1);
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(void) write(s, cmd, strlen(cmd) + 1);
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if (read(s, &c, 1) != 1) {
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perror(*ahost);
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goto bad;
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}
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if (c != 0) {
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while (read(s, &c, 1) == 1) {
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(void) write(2, &c, 1);
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if (c == '\n')
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break;
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}
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goto bad;
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}
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return (s);
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bad:
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if (port)
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(void) close(*fd2p);
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(void) close(s);
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return (-1);
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}
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