35
36#include "namespace.h"
37#include <sys/param.h>
38#include <sys/socket.h>
39#include <sys/stat.h>
40
41#include <netinet/in.h>
42#include <arpa/inet.h>
43
44#include <signal.h>
45#include <fcntl.h>
46#include <netdb.h>
47#include <stdlib.h>
48#include <unistd.h>
49#include <pwd.h>
50#include <errno.h>
51#include <stdio.h>
52#include <ctype.h>
53#include <string.h>
54#include <rpc/rpc.h>
55#ifdef YP
56#include <rpcsvc/yp_prot.h>
57#include <rpcsvc/ypclnt.h>
58#endif
59#include <arpa/nameser.h>
60#include "un-namespace.h"
61
62extern int innetgr( const char *, const char *, const char *, const char * );
63
64#define max(a, b) ((a > b) ? a : b)
65
66int __ivaliduser(FILE *, u_int32_t, const char *, const char *);
67int __ivaliduser_af(FILE *,const void *, const char *, const char *, int, int);
68int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t, const char *,
69 const char *);
70static int __icheckhost(const struct sockaddr *, socklen_t, const char *);
71
72char paddr[NI_MAXHOST];
73
74int
75rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
76 char **ahost;
77 u_short rport;
78 const char *locuser, *remuser, *cmd;
79 int *fd2p;
80{
81 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
82}
83
84int
85rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
86 char **ahost;
87 u_short rport;
88 const char *locuser, *remuser, *cmd;
89 int *fd2p;
90 int af;
91{
92 struct addrinfo hints, *res, *ai;
93 struct sockaddr_storage from;
94 fd_set reads;
95 sigset_t oldmask, newmask;
96 pid_t pid;
97 int s, aport, lport, timo, error;
98 char c, *p;
99 int refused, nres;
100 char num[8];
101 static char canonnamebuf[MAXDNAME]; /* is it proper here? */
102
103 /* call rcmdsh() with specified remote shell if appropriate. */
104 if (!issetugid() && (p = getenv("RSH"))) {
105 struct servent *sp = getservbyname("shell", "tcp");
106
107 if (sp && sp->s_port == rport)
108 return (rcmdsh(ahost, rport, locuser, remuser,
109 cmd, p));
110 }
111
112 /* use rsh(1) if non-root and remote port is shell. */
113 if (geteuid()) {
114 struct servent *sp = getservbyname("shell", "tcp");
115
116 if (sp && sp->s_port == rport)
117 return (rcmdsh(ahost, rport, locuser, remuser,
118 cmd, NULL));
119 }
120
121 pid = getpid();
122
123 memset(&hints, 0, sizeof(hints));
124 hints.ai_flags = AI_CANONNAME;
125 hints.ai_family = af;
126 hints.ai_socktype = SOCK_STREAM;
127 hints.ai_protocol = 0;
128 (void)snprintf(num, sizeof(num), "%d", ntohs(rport));
129 error = getaddrinfo(*ahost, num, &hints, &res);
130 if (error) {
131 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
132 gai_strerror(error));
133 if (error == EAI_SYSTEM)
134 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
135 strerror(errno));
136 return (-1);
137 }
138
139 if (res->ai_canonname
140 && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
141 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
142 *ahost = canonnamebuf;
143 }
144 nres = 0;
145 for (ai = res; ai; ai = ai->ai_next)
146 nres++;
147 ai = res;
148 refused = 0;
149 sigemptyset(&newmask);
150 sigaddset(&newmask, SIGURG);
151 _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask);
152 for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
153 s = rresvport_af(&lport, ai->ai_family);
154 if (s < 0) {
155 if (errno != EAGAIN && ai->ai_next) {
156 ai = ai->ai_next;
157 continue;
158 }
159 if (errno == EAGAIN)
160 (void)fprintf(stderr,
161 "rcmd: socket: All ports in use\n");
162 else
163 (void)fprintf(stderr, "rcmd: socket: %s\n",
164 strerror(errno));
165 freeaddrinfo(res);
166 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
167 NULL);
168 return (-1);
169 }
170 _fcntl(s, F_SETOWN, pid);
171 if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
172 break;
173 (void)_close(s);
174 if (errno == EADDRINUSE) {
175 lport--;
176 continue;
177 }
178 if (errno == ECONNREFUSED)
179 refused = 1;
180 if (ai->ai_next == NULL && (!refused || timo > 16)) {
181 (void)fprintf(stderr, "%s: %s\n",
182 *ahost, strerror(errno));
183 freeaddrinfo(res);
184 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
185 NULL);
186 return (-1);
187 }
188 if (nres > 1) {
189 int oerrno = errno;
190
191 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
192 sizeof(paddr), NULL, 0, NI_NUMERICHOST);
193 (void)fprintf(stderr, "connect to address %s: ",
194 paddr);
195 errno = oerrno;
196 perror(0);
197 }
198 if ((ai = ai->ai_next) == NULL) {
199 /* refused && timo <= 16 */
200 struct timespec time_to_sleep, time_remaining;
201
202 time_to_sleep.tv_sec = timo;
203 time_to_sleep.tv_nsec = 0;
204 (void)_nanosleep(&time_to_sleep, &time_remaining);
205 timo *= 2;
206 ai = res;
207 refused = 0;
208 }
209 if (nres > 1) {
210 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
211 sizeof(paddr), NULL, 0, NI_NUMERICHOST);
212 fprintf(stderr, "Trying %s...\n", paddr);
213 }
214 }
215 lport--;
216 if (fd2p == 0) {
217 _write(s, "", 1);
218 lport = 0;
219 } else {
220 int s2 = rresvport_af(&lport, ai->ai_family), s3;
221 socklen_t len = ai->ai_addrlen;
222 int nfds;
223
224 if (s2 < 0)
225 goto bad;
226 _listen(s2, 1);
227 (void)snprintf(num, sizeof(num), "%d", lport);
228 if (_write(s, num, strlen(num)+1) != strlen(num)+1) {
229 (void)fprintf(stderr,
230 "rcmd: write (setting up stderr): %s\n",
231 strerror(errno));
232 (void)_close(s2);
233 goto bad;
234 }
235 nfds = max(s, s2)+1;
236 if(nfds > FD_SETSIZE) {
237 fprintf(stderr, "rcmd: too many files\n");
238 (void)_close(s2);
239 goto bad;
240 }
241again:
242 FD_ZERO(&reads);
243 FD_SET(s, &reads);
244 FD_SET(s2, &reads);
245 errno = 0;
246 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
247 if (errno != 0)
248 (void)fprintf(stderr,
249 "rcmd: select (setting up stderr): %s\n",
250 strerror(errno));
251 else
252 (void)fprintf(stderr,
253 "select: protocol failure in circuit setup\n");
254 (void)_close(s2);
255 goto bad;
256 }
257 s3 = _accept(s2, (struct sockaddr *)&from, &len);
258 switch (from.ss_family) {
259 case AF_INET:
260 aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
261 break;
262#ifdef INET6
263 case AF_INET6:
264 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
265 break;
266#endif
267 default:
268 aport = 0; /* error */
269 break;
270 }
271 /*
272 * XXX careful for ftp bounce attacks. If discovered, shut them
273 * down and check for the real auxiliary channel to connect.
274 */
275 if (aport == 20) {
276 _close(s3);
277 goto again;
278 }
279 (void)_close(s2);
280 if (s3 < 0) {
281 (void)fprintf(stderr,
282 "rcmd: accept: %s\n", strerror(errno));
283 lport = 0;
284 goto bad;
285 }
286 *fd2p = s3;
287 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
288 (void)fprintf(stderr,
289 "socket: protocol failure in circuit setup.\n");
290 goto bad2;
291 }
292 }
293 (void)_write(s, locuser, strlen(locuser)+1);
294 (void)_write(s, remuser, strlen(remuser)+1);
295 (void)_write(s, cmd, strlen(cmd)+1);
296 if (_read(s, &c, 1) != 1) {
297 (void)fprintf(stderr,
298 "rcmd: %s: %s\n", *ahost, strerror(errno));
299 goto bad2;
300 }
301 if (c != 0) {
302 while (_read(s, &c, 1) == 1) {
303 (void)_write(STDERR_FILENO, &c, 1);
304 if (c == '\n')
305 break;
306 }
307 goto bad2;
308 }
309 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
310 freeaddrinfo(res);
311 return (s);
312bad2:
313 if (lport)
314 (void)_close(*fd2p);
315bad:
316 (void)_close(s);
317 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
318 freeaddrinfo(res);
319 return (-1);
320}
321
322int
323rresvport(port)
324 int *port;
325{
326 return rresvport_af(port, AF_INET);
327}
328
329int
330rresvport_af(alport, family)
331 int *alport, family;
332{
333 int s;
334 struct sockaddr_storage ss;
335 u_short *sport;
336
337 memset(&ss, 0, sizeof(ss));
338 ss.ss_family = family;
339 switch (family) {
340 case AF_INET:
341 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
342 sport = &((struct sockaddr_in *)&ss)->sin_port;
343 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
344 break;
345#ifdef INET6
346 case AF_INET6:
347 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
348 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
349 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
350 break;
351#endif
352 default:
353 errno = EAFNOSUPPORT;
354 return -1;
355 }
356
357 s = _socket(ss.ss_family, SOCK_STREAM, 0);
358 if (s < 0)
359 return (-1);
360#if 0 /* compat_exact_traditional_rresvport_semantics */
361 sin.sin_port = htons((u_short)*alport);
362 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
363 return (s);
364 if (errno != EADDRINUSE) {
365 (void)_close(s);
366 return (-1);
367 }
368#endif
369 *sport = 0;
370 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
371 (void)_close(s);
372 return (-1);
373 }
374 *alport = (int)ntohs(*sport);
375 return (s);
376}
377
378int __check_rhosts_file = 1;
379char *__rcmd_errstr;
380
381int
382ruserok(rhost, superuser, ruser, luser)
383 const char *rhost, *ruser, *luser;
384 int superuser;
385{
386 struct addrinfo hints, *res, *r;
387 int error;
388
389 memset(&hints, 0, sizeof(hints));
390 hints.ai_family = PF_UNSPEC;
391 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
392 error = getaddrinfo(rhost, "0", &hints, &res);
393 if (error)
394 return (-1);
395
396 for (r = res; r; r = r->ai_next) {
397 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
398 luser) == 0) {
399 freeaddrinfo(res);
400 return (0);
401 }
402 }
403 freeaddrinfo(res);
404 return (-1);
405}
406
407/*
408 * New .rhosts strategy: We are passed an ip address. We spin through
409 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
410 * has ip addresses, we don't have to trust a nameserver. When it
411 * contains hostnames, we spin through the list of addresses the nameserver
412 * gives us and look for a match.
413 *
414 * Returns 0 if ok, -1 if not ok.
415 */
416int
417iruserok(raddr, superuser, ruser, luser)
418 unsigned long raddr;
419 int superuser;
420 const char *ruser, *luser;
421{
422 struct sockaddr_in sin;
423
424 memset(&sin, 0, sizeof(sin));
425 sin.sin_family = AF_INET;
426 sin.sin_len = sizeof(struct sockaddr_in);
427 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
428 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
429 ruser, luser);
430}
431
432/*
433 * AF independent extension of iruserok.
434 *
435 * Returns 0 if ok, -1 if not ok.
436 */
437int
438iruserok_sa(ra, rlen, superuser, ruser, luser)
439 const void *ra;
440 int rlen;
441 int superuser;
442 const char *ruser, *luser;
443{
444 char *cp;
445 struct stat sbuf;
446 struct passwd *pwd;
447 FILE *hostf;
448 uid_t uid;
449 int first;
450 char pbuf[MAXPATHLEN];
451 const struct sockaddr *raddr;
452 struct sockaddr_storage ss;
453
454 /* avoid alignment issue */
455 if (rlen > sizeof(ss))
456 return(-1);
457 memcpy(&ss, ra, rlen);
458 raddr = (struct sockaddr *)&ss;
459
460 first = 1;
| 35
36#include "namespace.h"
37#include <sys/param.h>
38#include <sys/socket.h>
39#include <sys/stat.h>
40
41#include <netinet/in.h>
42#include <arpa/inet.h>
43
44#include <signal.h>
45#include <fcntl.h>
46#include <netdb.h>
47#include <stdlib.h>
48#include <unistd.h>
49#include <pwd.h>
50#include <errno.h>
51#include <stdio.h>
52#include <ctype.h>
53#include <string.h>
54#include <rpc/rpc.h>
55#ifdef YP
56#include <rpcsvc/yp_prot.h>
57#include <rpcsvc/ypclnt.h>
58#endif
59#include <arpa/nameser.h>
60#include "un-namespace.h"
61
62extern int innetgr( const char *, const char *, const char *, const char * );
63
64#define max(a, b) ((a > b) ? a : b)
65
66int __ivaliduser(FILE *, u_int32_t, const char *, const char *);
67int __ivaliduser_af(FILE *,const void *, const char *, const char *, int, int);
68int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t, const char *,
69 const char *);
70static int __icheckhost(const struct sockaddr *, socklen_t, const char *);
71
72char paddr[NI_MAXHOST];
73
74int
75rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
76 char **ahost;
77 u_short rport;
78 const char *locuser, *remuser, *cmd;
79 int *fd2p;
80{
81 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
82}
83
84int
85rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
86 char **ahost;
87 u_short rport;
88 const char *locuser, *remuser, *cmd;
89 int *fd2p;
90 int af;
91{
92 struct addrinfo hints, *res, *ai;
93 struct sockaddr_storage from;
94 fd_set reads;
95 sigset_t oldmask, newmask;
96 pid_t pid;
97 int s, aport, lport, timo, error;
98 char c, *p;
99 int refused, nres;
100 char num[8];
101 static char canonnamebuf[MAXDNAME]; /* is it proper here? */
102
103 /* call rcmdsh() with specified remote shell if appropriate. */
104 if (!issetugid() && (p = getenv("RSH"))) {
105 struct servent *sp = getservbyname("shell", "tcp");
106
107 if (sp && sp->s_port == rport)
108 return (rcmdsh(ahost, rport, locuser, remuser,
109 cmd, p));
110 }
111
112 /* use rsh(1) if non-root and remote port is shell. */
113 if (geteuid()) {
114 struct servent *sp = getservbyname("shell", "tcp");
115
116 if (sp && sp->s_port == rport)
117 return (rcmdsh(ahost, rport, locuser, remuser,
118 cmd, NULL));
119 }
120
121 pid = getpid();
122
123 memset(&hints, 0, sizeof(hints));
124 hints.ai_flags = AI_CANONNAME;
125 hints.ai_family = af;
126 hints.ai_socktype = SOCK_STREAM;
127 hints.ai_protocol = 0;
128 (void)snprintf(num, sizeof(num), "%d", ntohs(rport));
129 error = getaddrinfo(*ahost, num, &hints, &res);
130 if (error) {
131 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
132 gai_strerror(error));
133 if (error == EAI_SYSTEM)
134 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
135 strerror(errno));
136 return (-1);
137 }
138
139 if (res->ai_canonname
140 && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
141 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
142 *ahost = canonnamebuf;
143 }
144 nres = 0;
145 for (ai = res; ai; ai = ai->ai_next)
146 nres++;
147 ai = res;
148 refused = 0;
149 sigemptyset(&newmask);
150 sigaddset(&newmask, SIGURG);
151 _sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask);
152 for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
153 s = rresvport_af(&lport, ai->ai_family);
154 if (s < 0) {
155 if (errno != EAGAIN && ai->ai_next) {
156 ai = ai->ai_next;
157 continue;
158 }
159 if (errno == EAGAIN)
160 (void)fprintf(stderr,
161 "rcmd: socket: All ports in use\n");
162 else
163 (void)fprintf(stderr, "rcmd: socket: %s\n",
164 strerror(errno));
165 freeaddrinfo(res);
166 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
167 NULL);
168 return (-1);
169 }
170 _fcntl(s, F_SETOWN, pid);
171 if (_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
172 break;
173 (void)_close(s);
174 if (errno == EADDRINUSE) {
175 lport--;
176 continue;
177 }
178 if (errno == ECONNREFUSED)
179 refused = 1;
180 if (ai->ai_next == NULL && (!refused || timo > 16)) {
181 (void)fprintf(stderr, "%s: %s\n",
182 *ahost, strerror(errno));
183 freeaddrinfo(res);
184 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
185 NULL);
186 return (-1);
187 }
188 if (nres > 1) {
189 int oerrno = errno;
190
191 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
192 sizeof(paddr), NULL, 0, NI_NUMERICHOST);
193 (void)fprintf(stderr, "connect to address %s: ",
194 paddr);
195 errno = oerrno;
196 perror(0);
197 }
198 if ((ai = ai->ai_next) == NULL) {
199 /* refused && timo <= 16 */
200 struct timespec time_to_sleep, time_remaining;
201
202 time_to_sleep.tv_sec = timo;
203 time_to_sleep.tv_nsec = 0;
204 (void)_nanosleep(&time_to_sleep, &time_remaining);
205 timo *= 2;
206 ai = res;
207 refused = 0;
208 }
209 if (nres > 1) {
210 getnameinfo(ai->ai_addr, ai->ai_addrlen, paddr,
211 sizeof(paddr), NULL, 0, NI_NUMERICHOST);
212 fprintf(stderr, "Trying %s...\n", paddr);
213 }
214 }
215 lport--;
216 if (fd2p == 0) {
217 _write(s, "", 1);
218 lport = 0;
219 } else {
220 int s2 = rresvport_af(&lport, ai->ai_family), s3;
221 socklen_t len = ai->ai_addrlen;
222 int nfds;
223
224 if (s2 < 0)
225 goto bad;
226 _listen(s2, 1);
227 (void)snprintf(num, sizeof(num), "%d", lport);
228 if (_write(s, num, strlen(num)+1) != strlen(num)+1) {
229 (void)fprintf(stderr,
230 "rcmd: write (setting up stderr): %s\n",
231 strerror(errno));
232 (void)_close(s2);
233 goto bad;
234 }
235 nfds = max(s, s2)+1;
236 if(nfds > FD_SETSIZE) {
237 fprintf(stderr, "rcmd: too many files\n");
238 (void)_close(s2);
239 goto bad;
240 }
241again:
242 FD_ZERO(&reads);
243 FD_SET(s, &reads);
244 FD_SET(s2, &reads);
245 errno = 0;
246 if (_select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
247 if (errno != 0)
248 (void)fprintf(stderr,
249 "rcmd: select (setting up stderr): %s\n",
250 strerror(errno));
251 else
252 (void)fprintf(stderr,
253 "select: protocol failure in circuit setup\n");
254 (void)_close(s2);
255 goto bad;
256 }
257 s3 = _accept(s2, (struct sockaddr *)&from, &len);
258 switch (from.ss_family) {
259 case AF_INET:
260 aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
261 break;
262#ifdef INET6
263 case AF_INET6:
264 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
265 break;
266#endif
267 default:
268 aport = 0; /* error */
269 break;
270 }
271 /*
272 * XXX careful for ftp bounce attacks. If discovered, shut them
273 * down and check for the real auxiliary channel to connect.
274 */
275 if (aport == 20) {
276 _close(s3);
277 goto again;
278 }
279 (void)_close(s2);
280 if (s3 < 0) {
281 (void)fprintf(stderr,
282 "rcmd: accept: %s\n", strerror(errno));
283 lport = 0;
284 goto bad;
285 }
286 *fd2p = s3;
287 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
288 (void)fprintf(stderr,
289 "socket: protocol failure in circuit setup.\n");
290 goto bad2;
291 }
292 }
293 (void)_write(s, locuser, strlen(locuser)+1);
294 (void)_write(s, remuser, strlen(remuser)+1);
295 (void)_write(s, cmd, strlen(cmd)+1);
296 if (_read(s, &c, 1) != 1) {
297 (void)fprintf(stderr,
298 "rcmd: %s: %s\n", *ahost, strerror(errno));
299 goto bad2;
300 }
301 if (c != 0) {
302 while (_read(s, &c, 1) == 1) {
303 (void)_write(STDERR_FILENO, &c, 1);
304 if (c == '\n')
305 break;
306 }
307 goto bad2;
308 }
309 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
310 freeaddrinfo(res);
311 return (s);
312bad2:
313 if (lport)
314 (void)_close(*fd2p);
315bad:
316 (void)_close(s);
317 _sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
318 freeaddrinfo(res);
319 return (-1);
320}
321
322int
323rresvport(port)
324 int *port;
325{
326 return rresvport_af(port, AF_INET);
327}
328
329int
330rresvport_af(alport, family)
331 int *alport, family;
332{
333 int s;
334 struct sockaddr_storage ss;
335 u_short *sport;
336
337 memset(&ss, 0, sizeof(ss));
338 ss.ss_family = family;
339 switch (family) {
340 case AF_INET:
341 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
342 sport = &((struct sockaddr_in *)&ss)->sin_port;
343 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
344 break;
345#ifdef INET6
346 case AF_INET6:
347 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
348 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
349 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
350 break;
351#endif
352 default:
353 errno = EAFNOSUPPORT;
354 return -1;
355 }
356
357 s = _socket(ss.ss_family, SOCK_STREAM, 0);
358 if (s < 0)
359 return (-1);
360#if 0 /* compat_exact_traditional_rresvport_semantics */
361 sin.sin_port = htons((u_short)*alport);
362 if (_bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
363 return (s);
364 if (errno != EADDRINUSE) {
365 (void)_close(s);
366 return (-1);
367 }
368#endif
369 *sport = 0;
370 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
371 (void)_close(s);
372 return (-1);
373 }
374 *alport = (int)ntohs(*sport);
375 return (s);
376}
377
378int __check_rhosts_file = 1;
379char *__rcmd_errstr;
380
381int
382ruserok(rhost, superuser, ruser, luser)
383 const char *rhost, *ruser, *luser;
384 int superuser;
385{
386 struct addrinfo hints, *res, *r;
387 int error;
388
389 memset(&hints, 0, sizeof(hints));
390 hints.ai_family = PF_UNSPEC;
391 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
392 error = getaddrinfo(rhost, "0", &hints, &res);
393 if (error)
394 return (-1);
395
396 for (r = res; r; r = r->ai_next) {
397 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
398 luser) == 0) {
399 freeaddrinfo(res);
400 return (0);
401 }
402 }
403 freeaddrinfo(res);
404 return (-1);
405}
406
407/*
408 * New .rhosts strategy: We are passed an ip address. We spin through
409 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
410 * has ip addresses, we don't have to trust a nameserver. When it
411 * contains hostnames, we spin through the list of addresses the nameserver
412 * gives us and look for a match.
413 *
414 * Returns 0 if ok, -1 if not ok.
415 */
416int
417iruserok(raddr, superuser, ruser, luser)
418 unsigned long raddr;
419 int superuser;
420 const char *ruser, *luser;
421{
422 struct sockaddr_in sin;
423
424 memset(&sin, 0, sizeof(sin));
425 sin.sin_family = AF_INET;
426 sin.sin_len = sizeof(struct sockaddr_in);
427 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
428 return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
429 ruser, luser);
430}
431
432/*
433 * AF independent extension of iruserok.
434 *
435 * Returns 0 if ok, -1 if not ok.
436 */
437int
438iruserok_sa(ra, rlen, superuser, ruser, luser)
439 const void *ra;
440 int rlen;
441 int superuser;
442 const char *ruser, *luser;
443{
444 char *cp;
445 struct stat sbuf;
446 struct passwd *pwd;
447 FILE *hostf;
448 uid_t uid;
449 int first;
450 char pbuf[MAXPATHLEN];
451 const struct sockaddr *raddr;
452 struct sockaddr_storage ss;
453
454 /* avoid alignment issue */
455 if (rlen > sizeof(ss))
456 return(-1);
457 memcpy(&ss, ra, rlen);
458 raddr = (struct sockaddr *)&ss;
459
460 first = 1;
|
485 (void)seteuid(uid);
486
487 if (hostf == NULL)
488 return (-1);
489 /*
490 * If not a regular file, or is owned by someone other than
491 * user or root or if writeable by anyone but the owner, quit.
492 */
493 cp = NULL;
494 if (lstat(pbuf, &sbuf) < 0)
495 cp = ".rhosts lstat failed";
496 else if (!S_ISREG(sbuf.st_mode))
497 cp = ".rhosts not regular file";
498 else if (_fstat(fileno(hostf), &sbuf) < 0)
499 cp = ".rhosts fstat failed";
500 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
501 cp = "bad .rhosts owner";
502 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
503 cp = ".rhosts writeable by other than owner";
504 /* If there were any problems, quit. */
505 if (cp) {
506 __rcmd_errstr = cp;
507 (void)fclose(hostf);
508 return (-1);
509 }
510 goto again;
511 }
512 return (-1);
513}
514
515/*
516 * XXX
517 * Don't make static, used by lpd(8).
518 *
519 * Returns 0 if ok, -1 if not ok.
520 */
521int
522__ivaliduser(hostf, raddr, luser, ruser)
523 FILE *hostf;
524 u_int32_t raddr;
525 const char *luser, *ruser;
526{
527 struct sockaddr_in sin;
528
529 memset(&sin, 0, sizeof(sin));
530 sin.sin_family = AF_INET;
531 sin.sin_len = sizeof(struct sockaddr_in);
532 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
533 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
534 luser, ruser);
535}
536
537/*
538 * Returns 0 if ok, -1 if not ok.
539 *
540 * XXX obsolete API.
541 */
542int
543__ivaliduser_af(hostf, raddr, luser, ruser, af, len)
544 FILE *hostf;
545 const void *raddr;
546 const char *luser, *ruser;
547 int af, len;
548{
549 struct sockaddr *sa = NULL;
550 struct sockaddr_in *sin = NULL;
551#ifdef INET6
552 struct sockaddr_in6 *sin6 = NULL;
553#endif
554 struct sockaddr_storage ss;
555
556 memset(&ss, 0, sizeof(ss));
557 switch (af) {
558 case AF_INET:
559 if (len != sizeof(sin->sin_addr))
560 return -1;
561 sin = (struct sockaddr_in *)&ss;
562 sin->sin_family = AF_INET;
563 sin->sin_len = sizeof(struct sockaddr_in);
564 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
565 break;
566#ifdef INET6
567 case AF_INET6:
568 if (len != sizeof(sin6->sin6_addr))
569 return -1;
570 /* you will lose scope info */
571 sin6 = (struct sockaddr_in6 *)&ss;
572 sin6->sin6_family = AF_INET6;
573 sin6->sin6_len = sizeof(struct sockaddr_in6);
574 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
575 break;
576#endif
577 default:
578 return -1;
579 }
580
581 sa = (struct sockaddr *)&ss;
582 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
583}
584
585int
586__ivaliduser_sa(hostf, raddr, salen, luser, ruser)
587 FILE *hostf;
588 const struct sockaddr *raddr;
589 socklen_t salen;
590 const char *luser, *ruser;
591{
592 char *user, *p;
593 int ch;
594 char buf[MAXHOSTNAMELEN + 128]; /* host + login */
595 char hname[MAXHOSTNAMELEN];
596 /* Presumed guilty until proven innocent. */
597 int userok = 0, hostok = 0;
598#ifdef YP
599 char *ypdomain;
600
601 if (yp_get_default_domain(&ypdomain))
602 ypdomain = NULL;
603#else
604#define ypdomain NULL
605#endif
606 /* We need to get the damn hostname back for netgroup matching. */
607 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0,
608 NI_NAMEREQD) != 0)
609 hname[0] = '\0';
610
611 while (fgets(buf, sizeof(buf), hostf)) {
612 p = buf;
613 /* Skip lines that are too long. */
614 if (strchr(p, '\n') == NULL) {
615 while ((ch = getc(hostf)) != '\n' && ch != EOF);
616 continue;
617 }
618 if (*p == '\n' || *p == '#') {
619 /* comment... */
620 continue;
621 }
622 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
623 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
624 p++;
625 }
626 if (*p == ' ' || *p == '\t') {
627 *p++ = '\0';
628 while (*p == ' ' || *p == '\t')
629 p++;
630 user = p;
631 while (*p != '\n' && *p != ' ' &&
632 *p != '\t' && *p != '\0')
633 p++;
634 } else
635 user = p;
636 *p = '\0';
637 /*
638 * Do +/- and +@/-@ checking. This looks really nasty,
639 * but it matches SunOS's behavior so far as I can tell.
640 */
641 switch(buf[0]) {
642 case '+':
643 if (!buf[1]) { /* '+' matches all hosts */
644 hostok = 1;
645 break;
646 }
647 if (buf[1] == '@') /* match a host by netgroup */
648 hostok = hname[0] != '\0' &&
649 innetgr(&buf[2], hname, NULL, ypdomain);
650 else /* match a host by addr */
651 hostok = __icheckhost(raddr, salen,
652 (char *)&buf[1]);
653 break;
654 case '-': /* reject '-' hosts and all their users */
655 if (buf[1] == '@') {
656 if (hname[0] == '\0' ||
657 innetgr(&buf[2], hname, NULL, ypdomain))
658 return(-1);
659 } else {
660 if (__icheckhost(raddr, salen,
661 (char *)&buf[1]))
662 return(-1);
663 }
664 break;
665 default: /* if no '+' or '-', do a simple match */
666 hostok = __icheckhost(raddr, salen, buf);
667 break;
668 }
669 switch(*user) {
670 case '+':
671 if (!*(user+1)) { /* '+' matches all users */
672 userok = 1;
673 break;
674 }
675 if (*(user+1) == '@') /* match a user by netgroup */
676 userok = innetgr(user+2, NULL, ruser, ypdomain);
677 else /* match a user by direct specification */
678 userok = !(strcmp(ruser, user+1));
679 break;
680 case '-': /* if we matched a hostname, */
681 if (hostok) { /* check for user field rejections */
682 if (!*(user+1))
683 return(-1);
684 if (*(user+1) == '@') {
685 if (innetgr(user+2, NULL,
686 ruser, ypdomain))
687 return(-1);
688 } else {
689 if (!strcmp(ruser, user+1))
690 return(-1);
691 }
692 }
693 break;
694 default: /* no rejections: try to match the user */
695 if (hostok)
696 userok = !(strcmp(ruser,*user ? user : luser));
697 break;
698 }
699 if (hostok && userok)
700 return(0);
701 }
702 return (-1);
703}
704
705/*
706 * Returns "true" if match, 0 if no match.
707 */
708static int
709__icheckhost(raddr, salen, lhost)
710 const struct sockaddr *raddr;
711 socklen_t salen;
712 const char *lhost;
713{
714 struct sockaddr_in sin;
715 struct sockaddr_in6 *sin6;
716 struct addrinfo hints, *res, *r;
717 int error;
718 char h1[NI_MAXHOST], h2[NI_MAXHOST];
719
720 if (raddr->sa_family == AF_INET6) {
721 sin6 = (struct sockaddr_in6 *)raddr;
722 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
723 memset(&sin, 0, sizeof(sin));
724 sin.sin_family = AF_INET;
725 sin.sin_len = sizeof(struct sockaddr_in);
726 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
727 sizeof(sin.sin_addr));
728 raddr = (struct sockaddr *)&sin;
729 salen = sin.sin_len;
730 }
731 }
732
733 h1[0] = '\0';
734 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
735 NI_NUMERICHOST) != 0)
736 return (0);
737
738 /* Resolve laddr into sockaddr */
739 memset(&hints, 0, sizeof(hints));
740 hints.ai_family = raddr->sa_family;
741 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
742 res = NULL;
743 error = getaddrinfo(lhost, "0", &hints, &res);
744 if (error)
745 return (0);
746
747 for (r = res; r ; r = r->ai_next) {
748 h2[0] = '\0';
749 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
750 NULL, 0, NI_NUMERICHOST) != 0)
751 continue;
752 if (strcmp(h1, h2) == 0) {
753 freeaddrinfo(res);
754 return (1);
755 }
756 }
757
758 /* No match. */
759 freeaddrinfo(res);
760 return (0);
761}
| 485 (void)seteuid(uid);
486
487 if (hostf == NULL)
488 return (-1);
489 /*
490 * If not a regular file, or is owned by someone other than
491 * user or root or if writeable by anyone but the owner, quit.
492 */
493 cp = NULL;
494 if (lstat(pbuf, &sbuf) < 0)
495 cp = ".rhosts lstat failed";
496 else if (!S_ISREG(sbuf.st_mode))
497 cp = ".rhosts not regular file";
498 else if (_fstat(fileno(hostf), &sbuf) < 0)
499 cp = ".rhosts fstat failed";
500 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
501 cp = "bad .rhosts owner";
502 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
503 cp = ".rhosts writeable by other than owner";
504 /* If there were any problems, quit. */
505 if (cp) {
506 __rcmd_errstr = cp;
507 (void)fclose(hostf);
508 return (-1);
509 }
510 goto again;
511 }
512 return (-1);
513}
514
515/*
516 * XXX
517 * Don't make static, used by lpd(8).
518 *
519 * Returns 0 if ok, -1 if not ok.
520 */
521int
522__ivaliduser(hostf, raddr, luser, ruser)
523 FILE *hostf;
524 u_int32_t raddr;
525 const char *luser, *ruser;
526{
527 struct sockaddr_in sin;
528
529 memset(&sin, 0, sizeof(sin));
530 sin.sin_family = AF_INET;
531 sin.sin_len = sizeof(struct sockaddr_in);
532 memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
533 return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
534 luser, ruser);
535}
536
537/*
538 * Returns 0 if ok, -1 if not ok.
539 *
540 * XXX obsolete API.
541 */
542int
543__ivaliduser_af(hostf, raddr, luser, ruser, af, len)
544 FILE *hostf;
545 const void *raddr;
546 const char *luser, *ruser;
547 int af, len;
548{
549 struct sockaddr *sa = NULL;
550 struct sockaddr_in *sin = NULL;
551#ifdef INET6
552 struct sockaddr_in6 *sin6 = NULL;
553#endif
554 struct sockaddr_storage ss;
555
556 memset(&ss, 0, sizeof(ss));
557 switch (af) {
558 case AF_INET:
559 if (len != sizeof(sin->sin_addr))
560 return -1;
561 sin = (struct sockaddr_in *)&ss;
562 sin->sin_family = AF_INET;
563 sin->sin_len = sizeof(struct sockaddr_in);
564 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
565 break;
566#ifdef INET6
567 case AF_INET6:
568 if (len != sizeof(sin6->sin6_addr))
569 return -1;
570 /* you will lose scope info */
571 sin6 = (struct sockaddr_in6 *)&ss;
572 sin6->sin6_family = AF_INET6;
573 sin6->sin6_len = sizeof(struct sockaddr_in6);
574 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
575 break;
576#endif
577 default:
578 return -1;
579 }
580
581 sa = (struct sockaddr *)&ss;
582 return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
583}
584
585int
586__ivaliduser_sa(hostf, raddr, salen, luser, ruser)
587 FILE *hostf;
588 const struct sockaddr *raddr;
589 socklen_t salen;
590 const char *luser, *ruser;
591{
592 char *user, *p;
593 int ch;
594 char buf[MAXHOSTNAMELEN + 128]; /* host + login */
595 char hname[MAXHOSTNAMELEN];
596 /* Presumed guilty until proven innocent. */
597 int userok = 0, hostok = 0;
598#ifdef YP
599 char *ypdomain;
600
601 if (yp_get_default_domain(&ypdomain))
602 ypdomain = NULL;
603#else
604#define ypdomain NULL
605#endif
606 /* We need to get the damn hostname back for netgroup matching. */
607 if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0,
608 NI_NAMEREQD) != 0)
609 hname[0] = '\0';
610
611 while (fgets(buf, sizeof(buf), hostf)) {
612 p = buf;
613 /* Skip lines that are too long. */
614 if (strchr(p, '\n') == NULL) {
615 while ((ch = getc(hostf)) != '\n' && ch != EOF);
616 continue;
617 }
618 if (*p == '\n' || *p == '#') {
619 /* comment... */
620 continue;
621 }
622 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
623 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
624 p++;
625 }
626 if (*p == ' ' || *p == '\t') {
627 *p++ = '\0';
628 while (*p == ' ' || *p == '\t')
629 p++;
630 user = p;
631 while (*p != '\n' && *p != ' ' &&
632 *p != '\t' && *p != '\0')
633 p++;
634 } else
635 user = p;
636 *p = '\0';
637 /*
638 * Do +/- and +@/-@ checking. This looks really nasty,
639 * but it matches SunOS's behavior so far as I can tell.
640 */
641 switch(buf[0]) {
642 case '+':
643 if (!buf[1]) { /* '+' matches all hosts */
644 hostok = 1;
645 break;
646 }
647 if (buf[1] == '@') /* match a host by netgroup */
648 hostok = hname[0] != '\0' &&
649 innetgr(&buf[2], hname, NULL, ypdomain);
650 else /* match a host by addr */
651 hostok = __icheckhost(raddr, salen,
652 (char *)&buf[1]);
653 break;
654 case '-': /* reject '-' hosts and all their users */
655 if (buf[1] == '@') {
656 if (hname[0] == '\0' ||
657 innetgr(&buf[2], hname, NULL, ypdomain))
658 return(-1);
659 } else {
660 if (__icheckhost(raddr, salen,
661 (char *)&buf[1]))
662 return(-1);
663 }
664 break;
665 default: /* if no '+' or '-', do a simple match */
666 hostok = __icheckhost(raddr, salen, buf);
667 break;
668 }
669 switch(*user) {
670 case '+':
671 if (!*(user+1)) { /* '+' matches all users */
672 userok = 1;
673 break;
674 }
675 if (*(user+1) == '@') /* match a user by netgroup */
676 userok = innetgr(user+2, NULL, ruser, ypdomain);
677 else /* match a user by direct specification */
678 userok = !(strcmp(ruser, user+1));
679 break;
680 case '-': /* if we matched a hostname, */
681 if (hostok) { /* check for user field rejections */
682 if (!*(user+1))
683 return(-1);
684 if (*(user+1) == '@') {
685 if (innetgr(user+2, NULL,
686 ruser, ypdomain))
687 return(-1);
688 } else {
689 if (!strcmp(ruser, user+1))
690 return(-1);
691 }
692 }
693 break;
694 default: /* no rejections: try to match the user */
695 if (hostok)
696 userok = !(strcmp(ruser,*user ? user : luser));
697 break;
698 }
699 if (hostok && userok)
700 return(0);
701 }
702 return (-1);
703}
704
705/*
706 * Returns "true" if match, 0 if no match.
707 */
708static int
709__icheckhost(raddr, salen, lhost)
710 const struct sockaddr *raddr;
711 socklen_t salen;
712 const char *lhost;
713{
714 struct sockaddr_in sin;
715 struct sockaddr_in6 *sin6;
716 struct addrinfo hints, *res, *r;
717 int error;
718 char h1[NI_MAXHOST], h2[NI_MAXHOST];
719
720 if (raddr->sa_family == AF_INET6) {
721 sin6 = (struct sockaddr_in6 *)raddr;
722 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
723 memset(&sin, 0, sizeof(sin));
724 sin.sin_family = AF_INET;
725 sin.sin_len = sizeof(struct sockaddr_in);
726 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
727 sizeof(sin.sin_addr));
728 raddr = (struct sockaddr *)&sin;
729 salen = sin.sin_len;
730 }
731 }
732
733 h1[0] = '\0';
734 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
735 NI_NUMERICHOST) != 0)
736 return (0);
737
738 /* Resolve laddr into sockaddr */
739 memset(&hints, 0, sizeof(hints));
740 hints.ai_family = raddr->sa_family;
741 hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
742 res = NULL;
743 error = getaddrinfo(lhost, "0", &hints, &res);
744 if (error)
745 return (0);
746
747 for (r = res; r ; r = r->ai_next) {
748 h2[0] = '\0';
749 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
750 NULL, 0, NI_NUMERICHOST) != 0)
751 continue;
752 if (strcmp(h1, h2) == 0) {
753 freeaddrinfo(res);
754 return (1);
755 }
756 }
757
758 /* No match. */
759 freeaddrinfo(res);
760 return (0);
761}
|