![[BACK]](/icons/back.gif){kind=icon}
Return to kcmd.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / rlogin|
Return to kcmd.c CVS log | Up to [local] / src / usr.bin / rlogin |
1.3 ! deraadt 1: /* $OpenBSD: kcmd.c,v 1.2 1995/03/21 07:58:32 cgd Exp $ */
1.1 deraadt 2: /* $NetBSD: kcmd.c,v 1.2 1995/03/21 07:58:32 cgd Exp $ */
3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: #if 0
39: static char Xsccsid[] = "derived from @(#)rcmd.c 5.17 (Berkeley) 6/27/88";
40: static char sccsid[] = "@(#)kcmd.c 8.2 (Berkeley) 8/19/93";
41: #else
1.3 ! deraadt 42: static char rcsid[] = "$OpenBSD: kcmd.c,v 1.2 1995/03/21 07:58:32 cgd Exp $";
1.1 deraadt 43: #endif
44: #endif /* not lint */
45:
46: #include <sys/param.h>
47: #include <sys/file.h>
48: #include <sys/socket.h>
49: #include <sys/stat.h>
50:
51: #include <netinet/in.h>
52: #include <arpa/inet.h>
53:
54: #include <kerberosIV/des.h>
55: #include <kerberosIV/krb.h>
56: #include <kerberosIV/kparse.h>
57:
58: #include <ctype.h>
59: #include <errno.h>
60: #include <netdb.h>
61: #include <pwd.h>
62: #include <signal.h>
63: #include <stdio.h>
64: #include <stdlib.h>
65: #include <string.h>
66: #include <unistd.h>
67:
68: #ifndef MAXHOSTNAMELEN
69: #define MAXHOSTNAMELEN 64
70: #endif
71:
72: #define START_PORT 5120 /* arbitrary */
73:
74: int getport __P((int *));
75:
76: int
77: kcmd(sock, ahost, rport, locuser, remuser, cmd, fd2p, ticket, service, realm,
78: cred, schedule, msg_data, laddr, faddr, authopts)
79: int *sock;
80: char **ahost;
81: u_short rport;
82: char *locuser, *remuser, *cmd;
83: int *fd2p;
84: KTEXT ticket;
85: char *service;
86: char *realm;
87: CREDENTIALS *cred;
88: Key_schedule schedule;
89: MSG_DAT *msg_data;
90: struct sockaddr_in *laddr, *faddr;
91: long authopts;
92: {
93: int s, timo = 1, pid;
94: long oldmask;
95: struct sockaddr_in sin, from;
96: char c;
97: #ifdef ATHENA_COMPAT
98: int lport = IPPORT_RESERVED - 1;
99: #else
100: int lport = START_PORT;
101: #endif
102: struct hostent *hp;
103: int rc;
104: char *host_save;
105: int status;
106:
107: pid = getpid();
108: hp = gethostbyname(*ahost);
109: if (hp == NULL) {
110: /* fprintf(stderr, "%s: unknown host\n", *ahost); */
111: return (-1);
112: }
113:
114: host_save = malloc(strlen(hp->h_name) + 1);
115: strcpy(host_save, hp->h_name);
116: *ahost = host_save;
117:
118: #ifdef KERBEROS
119: /* If realm is null, look up from table */
120: if (realm == NULL || realm[0] == '\0')
121: realm = krb_realmofhost(host_save);
122: #endif /* KERBEROS */
123:
124: oldmask = sigblock(sigmask(SIGURG));
125: for (;;) {
126: s = getport(&lport);
127: if (s < 0) {
128: if (errno == EAGAIN)
129: fprintf(stderr,
130: "kcmd(socket): All ports in use\n");
131: else
132: perror("kcmd: socket");
133: sigsetmask(oldmask);
134: return (-1);
135: }
136: fcntl(s, F_SETOWN, pid);
137: sin.sin_family = hp->h_addrtype;
138: #if defined(ultrix) || defined(sun)
139: bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
140: #else
141: bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, hp->h_length);
142: #endif
143: sin.sin_port = rport;
144: if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
145: break;
146: (void) close(s);
147: if (errno == EADDRINUSE) {
148: lport--;
149: continue;
150: }
151: /*
152: * don't wait very long for Kerberos rcmd.
153: */
154: if (errno == ECONNREFUSED && timo <= 4) {
155: /* sleep(timo); don't wait at all here */
156: timo *= 2;
157: continue;
158: }
159: #if !(defined(ultrix) || defined(sun))
160: if (hp->h_addr_list[1] != NULL) {
161: int oerrno = errno;
162:
163: fprintf(stderr,
164: "kcmd: connect to address %s: ",
165: inet_ntoa(sin.sin_addr));
166: errno = oerrno;
167: perror(NULL);
168: hp->h_addr_list++;
169: bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr,
170: hp->h_length);
171: fprintf(stderr, "Trying %s...\n",
172: inet_ntoa(sin.sin_addr));
173: continue;
174: }
175: #endif /* !(defined(ultrix) || defined(sun)) */
176: if (errno != ECONNREFUSED)
177: perror(hp->h_name);
178: sigsetmask(oldmask);
179: return (-1);
180: }
181: lport--;
182: if (fd2p == 0) {
183: write(s, "", 1);
184: lport = 0;
185: } else {
186: char num[8];
187: int s2 = getport(&lport), s3;
188: int len = sizeof(from);
189:
190: if (s2 < 0) {
191: status = -1;
192: goto bad;
193: }
194: listen(s2, 1);
195: (void) sprintf(num, "%d", lport);
196: if (write(s, num, strlen(num) + 1) != strlen(num) + 1) {
197: perror("kcmd(write): setting up stderr");
198: (void) close(s2);
199: status = -1;
200: goto bad;
201: }
202: s3 = accept(s2, (struct sockaddr *)&from, &len);
203: (void) close(s2);
204: if (s3 < 0) {
205: perror("kcmd:accept");
206: lport = 0;
207: status = -1;
208: goto bad;
209: }
210: *fd2p = s3;
211: from.sin_port = ntohs((u_short)from.sin_port);
212: if (from.sin_family != AF_INET ||
213: from.sin_port >= IPPORT_RESERVED) {
214: fprintf(stderr,
215: "kcmd(socket): protocol failure in circuit setup.\n");
216: status = -1;
217: goto bad2;
218: }
219: }
220: /*
221: * Kerberos-authenticated service. Don't have to send locuser,
222: * since its already in the ticket, and we'll extract it on
223: * the other side.
224: */
225: /* (void) write(s, locuser, strlen(locuser)+1); */
226:
227: /* set up the needed stuff for mutual auth, but only if necessary */
228: if (authopts & KOPT_DO_MUTUAL) {
229: int sin_len;
230: *faddr = sin;
231:
232: sin_len = sizeof(struct sockaddr_in);
233: if (getsockname(s, (struct sockaddr *)laddr, &sin_len) < 0) {
234: perror("kcmd(getsockname)");
235: status = -1;
236: goto bad2;
237: }
238: }
239: #ifdef KERBEROS
240: if ((status = krb_sendauth(authopts, s, ticket, service, *ahost,
241: realm, (unsigned long) getpid(), msg_data,
242: cred, schedule,
243: laddr,
244: faddr,
245: "KCMDV0.1")) != KSUCCESS)
246: goto bad2;
247: #endif /* KERBEROS */
248:
249: (void) write(s, remuser, strlen(remuser)+1);
250: (void) write(s, cmd, strlen(cmd)+1);
251:
252: if ((rc = read(s, &c, 1)) != 1) {
253: if (rc == -1)
254: perror(*ahost);
255: else
256: fprintf(stderr,"kcmd: bad connection with remote host\n");
257: status = -1;
258: goto bad2;
259: }
260: if (c != '\0') {
261: while (read(s, &c, 1) == 1) {
262: (void) write(2, &c, 1);
263: if (c == '\n')
264: break;
265: }
266: status = -1;
267: goto bad2;
268: }
269: sigsetmask(oldmask);
270: *sock = s;
271: return (KSUCCESS);
272: bad2:
273: if (lport)
274: (void) close(*fd2p);
275: bad:
276: (void) close(s);
277: sigsetmask(oldmask);
278: return (status);
279: }
280:
281: int
282: getport(alport)
283: int *alport;
284: {
285: struct sockaddr_in sin;
286: int s;
287:
288: sin.sin_family = AF_INET;
289: sin.sin_addr.s_addr = INADDR_ANY;
290: s = socket(AF_INET, SOCK_STREAM, 0);
291: if (s < 0)
292: return (-1);
293: for (;;) {
294: sin.sin_port = htons((u_short)*alport);
295: if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
296: return (s);
297: if (errno != EADDRINUSE) {
298: (void) close(s);
299: return (-1);
300: }
301: (*alport)--;
302: #ifdef ATHENA_COMPAT
303: if (*alport == IPPORT_RESERVED/2) {
304: #else
305: if (*alport == IPPORT_RESERVED) {
306: #endif
307: (void) close(s);
308: errno = EAGAIN; /* close */
309: return (-1);
310: }
311: }
312: }