1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34 __SCCSID("@(#)rexec.c 8.1 (Berkeley) 6/4/93");
35
36 #include <sys/types.h>
37 #include <sys/uio.h>
38 #include <sys/socket.h>
39 #include <sys/param.h>
40 #include <sys/stat.h>
41
42 #include <netinet/in.h>
43
44 #include <stdio.h>
45 #include <unistd.h>
46 #include <string.h>
47 #include <netdb.h>
48 #include <errno.h>
49 #include <ctype.h>
50 #include <err.h>
51 #include <stdlib.h>
52 #include <unistd.h>
53
54 int rexecoptions;
55 char *getpass(), *getlogin();
56
57 /*
58 * Options and other state info.
59 */
60 struct macel {
61 char mac_name[9]; /* macro name */
62 char *mac_start; /* start of macro in macbuf */
63 char *mac_end; /* end of macro in macbuf */
64 };
65
66 int macnum; /* number of defined macros */
67 struct macel macros[16];
68 char macbuf[4096];
69
70 static FILE *cfile;
71
72 #define DEFAULT 1
73 #define LOGIN 2
74 #define PASSWD 3
75 #define ACCOUNT 4
76 #define MACDEF 5
77 #define ID 10
78 #define MACH 11
79
80 static char tokval[100];
81
82 static struct toktab {
83 char *tokstr;
84 int tval;
85 } toktab[]= {
86 { "default", DEFAULT },
87 { "login", LOGIN },
88 { "password", PASSWD },
89 { "passwd", PASSWD },
90 { "account", ACCOUNT },
91 { "machine", MACH },
92 { "macdef", MACDEF },
93 { NULL, 0 }
94 };
95
96 static int
token()97 token()
98 {
99 char *cp;
100 int c;
101 struct toktab *t;
102
103 if (feof(cfile) || ferror(cfile))
104 return (0);
105 while ((c = getc(cfile)) != EOF &&
106 (c == '\n' || c == '\t' || c == ' ' || c == ','))
107 continue;
108 if (c == EOF)
109 return (0);
110 cp = tokval;
111 if (c == '"') {
112 while ((c = getc(cfile)) != EOF && c != '"') {
113 if (c == '\\')
114 c = getc(cfile);
115 *cp++ = c;
116 }
117 } else {
118 *cp++ = c;
119 while ((c = getc(cfile)) != EOF
120 && c != '\n' && c != '\t' && c != ' ' && c != ',') {
121 if (c == '\\')
122 c = getc(cfile);
123 *cp++ = c;
124 }
125 }
126 *cp = 0;
127 if (tokval[0] == 0)
128 return (0);
129 for (t = toktab; t->tokstr; t++)
130 if (!strcmp(t->tokstr, tokval))
131 return (t->tval);
132 return (ID);
133 }
134
135 static int
ruserpass(host,aname,apass,aacct)136 ruserpass(host, aname, apass, aacct)
137 char *host, **aname, **apass, **aacct;
138 {
139 char *hdir, buf[BUFSIZ], *tmp;
140 char myname[MAXHOSTNAMELEN], *mydomain;
141 int t, i, c, usedefault = 0;
142 struct stat stb;
143
144 hdir = getenv("HOME");
145 if (hdir == NULL)
146 hdir = ".";
147 if (strlen(hdir) + 8 > sizeof(buf))
148 return (0);
149 (void) sprintf(buf, "%s/.netrc", hdir);
150 cfile = fopen(buf, "r");
151 if (cfile == NULL) {
152 if (errno != ENOENT)
153 warn("%s", buf);
154 return (0);
155 }
156 if (gethostname(myname, sizeof(myname)) < 0)
157 myname[0] = '\0';
158 if ((mydomain = strchr(myname, '.')) == NULL)
159 mydomain = "";
160 next:
161 while ((t = token())) switch(t) {
162
163 case DEFAULT:
164 usedefault = 1;
165 /* FALL THROUGH */
166
167 case MACH:
168 if (!usedefault) {
169 if (token() != ID)
170 continue;
171 /*
172 * Allow match either for user's input host name
173 * or official hostname. Also allow match of
174 * incompletely-specified host in local domain.
175 */
176 if (strcasecmp(host, tokval) == 0)
177 goto match;
178 if ((tmp = strchr(host, '.')) != NULL &&
179 strcasecmp(tmp, mydomain) == 0 &&
180 strncasecmp(host, tokval, tmp - host) == 0 &&
181 tokval[tmp - host] == '\0')
182 goto match;
183 continue;
184 }
185 match:
186 while ((t = token()) && t != MACH && t != DEFAULT) switch(t) {
187
188 case LOGIN:
189 if (token())
190 if (*aname == NULL) {
191 *aname = malloc((unsigned) strlen(tokval) + 1);
192 (void) strcpy(*aname, tokval);
193 } else {
194 if (strcmp(*aname, tokval))
195 goto next;
196 }
197 break;
198 case PASSWD:
199 if ((*aname == NULL || strcmp(*aname, "anonymous")) &&
200 fstat(fileno(cfile), &stb) >= 0 &&
201 (stb.st_mode & 077) != 0) {
202 warnx("Error: .netrc file is readable by others.");
203 warnx("Remove password or make file unreadable by others.");
204 goto bad;
205 }
206 if (token() && *apass == NULL) {
207 *apass = malloc((unsigned) strlen(tokval) + 1);
208 (void) strcpy(*apass, tokval);
209 }
210 break;
211 case ACCOUNT:
212 if (fstat(fileno(cfile), &stb) >= 0
213 && (stb.st_mode & 077) != 0) {
214 warnx("Error: .netrc file is readable by others.");
215 warnx("Remove account or make file unreadable by others.");
216 goto bad;
217 }
218 if (token() && *aacct == NULL) {
219 *aacct = malloc((unsigned) strlen(tokval) + 1);
220 (void) strcpy(*aacct, tokval);
221 }
222 break;
223 case MACDEF:
224 while ((c=getc(cfile)) != EOF &&
225 (c == ' ' || c == '\t'))
226 ;
227 if (c == EOF || c == '\n') {
228 printf("Missing macdef name argument.\n");
229 goto bad;
230 }
231 if (macnum == 16) {
232 printf("Limit of 16 macros have already been defined\n");
233 goto bad;
234 }
235 tmp = macros[macnum].mac_name;
236 *tmp++ = c;
237 for (i=0; i < 8 && (c=getc(cfile)) != EOF &&
238 !isspace(c); ++i) {
239 *tmp++ = c;
240 }
241 if (c == EOF) {
242 printf("Macro definition missing null line terminator.\n");
243 goto bad;
244 }
245 *tmp = '\0';
246 if (c != '\n') {
247 while ((c=getc(cfile)) != EOF && c != '\n');
248 }
249 if (c == EOF) {
250 printf("Macro definition missing null line terminator.\n");
251 goto bad;
252 }
253 if (macnum == 0) {
254 macros[macnum].mac_start = macbuf;
255 }
256 else {
257 macros[macnum].mac_start = macros[macnum-1].mac_end + 1;
258 }
259 tmp = macros[macnum].mac_start;
260 while (tmp != macbuf + 4096) {
261 if ((c=getc(cfile)) == EOF) {
262 printf("Macro definition missing null line terminator.\n");
263 goto bad;
264 }
265 *tmp = c;
266 if (*tmp == '\n') {
267 if (*(tmp-1) == '\0') {
268 macros[macnum++].mac_end = tmp - 1;
269 break;
270 }
271 *tmp = '\0';
272 }
273 tmp++;
274 }
275 if (tmp == macbuf + 4096) {
276 printf("4K macro buffer exceeded\n");
277 goto bad;
278 }
279 break;
280 default:
281 warnx("Unknown .netrc keyword %s", tokval);
282 break;
283 }
284 goto done;
285 }
286 done:
287 (void) fclose(cfile);
288 return (0);
289 bad:
290 (void) fclose(cfile);
291 return (-1);
292 }
293
294 int
rexec(ahost,rport,name,pass,cmd,fd2p)295 rexec(ahost, rport, name, pass, cmd, fd2p)
296 char **ahost;
297 int rport;
298 char *name, *pass, *cmd;
299 int *fd2p;
300 {
301 struct sockaddr_in sin, sin2, from;
302 struct hostent *hp;
303 u_short port;
304 int s, timo = 1, s3;
305 char c, *acct;
306
307 hp = gethostbyname(*ahost);
308 if (hp == NULL) {
309 herror(*ahost);
310 return (-1);
311 }
312 *ahost = hp->h_name;
313 acct = NULL;
314 ruserpass(hp->h_name, &name, &pass, &acct);
315 free(acct);
316 retry:
317 s = socket(AF_INET, SOCK_STREAM, 0);
318 if (s < 0) {
319 perror("rexec: socket");
320 return (-1);
321 }
322 sin.sin_family = hp->h_addrtype;
323 sin.sin_port = rport;
324 bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
325 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
326 if (errno == ECONNREFUSED && timo <= 16) {
327 (void) close(s);
328 sleep(timo);
329 timo *= 2;
330 goto retry;
331 }
332 perror(hp->h_name);
333 (void) close(s);
334 return (-1);
335 }
336 port = 0;
337 if (fd2p == 0)
338 (void) write(s, "", 1);
339 else {
340 char num[8];
341 int s2, sin2len;
342
343 s2 = socket(AF_INET, SOCK_STREAM, 0);
344 if (s2 < 0) {
345 (void) close(s);
346 return (-1);
347 }
348 listen(s2, 1);
349 sin2len = sizeof (sin2);
350 if (getsockname(s2, (struct sockaddr *)&sin2, &sin2len) < 0 ||
351 sin2len != sizeof (sin2)) {
352 perror("getsockname");
353 (void) close(s2);
354 goto bad;
355 }
356 port = ntohs((u_short)sin2.sin_port);
357 (void) sprintf(num, "%hu", port);
358 (void) write(s, num, strlen(num)+1);
359 { int len = sizeof (from);
360 s3 = accept(s2, (struct sockaddr *)&from, &len);
361 close(s2);
362 if (s3 < 0) {
363 perror("accept");
364 port = 0;
365 goto bad;
366 }
367 }
368 *fd2p = s3;
369 }
370 (void) write(s, name, strlen(name) + 1);
371 /* should public key encypt the password here */
372 (void) write(s, pass, strlen(pass) + 1);
373 (void) write(s, cmd, strlen(cmd) + 1);
374 if (read(s, &c, 1) != 1) {
375 perror(*ahost);
376 goto bad;
377 }
378 if (c != 0) {
379 while (read(s, &c, 1) == 1) {
380 (void) write(2, &c, 1);
381 if (c == '\n')
382 break;
383 }
384 goto bad;
385 }
386 return (s);
387 bad:
388 if (port)
389 (void) close(*fd2p);
390 (void) close(s);
391 return (-1);
392 }
393