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Diffstat (limited to 'src/lib/libc/net/ruserok.c')
-rw-r--r--src/lib/libc/net/ruserok.c392
1 files changed, 0 insertions, 392 deletions
diff --git a/src/lib/libc/net/ruserok.c b/src/lib/libc/net/ruserok.c
deleted file mode 100644
index a399c013e2..0000000000
--- a/src/lib/libc/net/ruserok.c
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1/*
2 * Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved.
3 * Copyright (c) 1983, 1993, 1994
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/socket.h>
32#include <sys/stat.h>
33
34#include <netinet/in.h>
35#include <arpa/inet.h>
36
37#include <ctype.h>
38#include <errno.h>
39#include <fcntl.h>
40#include <limits.h>
41#include <netdb.h>
42#include <netgroup.h>
43#include <pwd.h>
44#include <signal.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <syslog.h>
49#include <unistd.h>
50
51static int __ivaliduser_sa(FILE *, struct sockaddr *, socklen_t,
52 const char *, const char *);
53static int __icheckhost(struct sockaddr *, socklen_t, const char *);
54static char *__gethostloop(struct sockaddr *, socklen_t);
55static int iruserok_sa(const void *, int, int, const char *, const char *);
56
57int
58ruserok(const char *rhost, int superuser, const char *ruser, const char *luser)
59{
60 struct addrinfo hints, *res, *r;
61 int error;
62
63 memset(&hints, 0, sizeof(hints));
64 hints.ai_family = PF_UNSPEC;
65 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
66 error = getaddrinfo(rhost, "0", &hints, &res);
67 if (error)
68 return (-1);
69
70 for (r = res; r; r = r->ai_next) {
71 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
72 luser) == 0) {
73 freeaddrinfo(res);
74 return (0);
75 }
76 }
77 freeaddrinfo(res);
78 return (-1);
79}
80
81int
82iruserok_sa(const void *raddr, int rlen, int superuser, const char *ruser,
83 const char *luser)
84{
85 struct sockaddr *sa;
86 char *cp;
87 struct stat sbuf;
88 struct passwd pwstore, *pwd;
89 FILE *hostf;
90 uid_t uid;
91 int first;
92 char pbuf[PATH_MAX], pwbuf[_PW_BUF_LEN];
93
94 sa = (struct sockaddr *)raddr;
95 first = 1;
96 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "re");
97again:
98 if (hostf) {
99 if (__ivaliduser_sa(hostf, sa, rlen, luser, ruser) == 0) {
100 (void)fclose(hostf);
101 return (0);
102 }
103 (void)fclose(hostf);
104 }
105 if (first == 1) {
106 int len;
107
108 first = 0;
109 pwd = NULL;
110 getpwnam_r(luser, &pwstore, pwbuf, sizeof(pwbuf), &pwd);
111 if (pwd == NULL)
112 return (-1);
113 len = snprintf(pbuf, sizeof pbuf, "%s/.rhosts", pwd->pw_dir);
114 if (len < 0 || len >= sizeof pbuf)
115 return (-1);
116
117 /*
118 * Change effective uid while opening .rhosts. If root and
119 * reading an NFS mounted file system, can't read files that
120 * are protected read/write owner only.
121 */
122 uid = geteuid();
123 (void)seteuid(pwd->pw_uid);
124 hostf = fopen(pbuf, "re");
125 (void)seteuid(uid);
126
127 if (hostf == NULL)
128 return (-1);
129 /*
130 * If not a regular file, or is owned by someone other than
131 * user or root or if writeable by anyone but the owner, quit.
132 */
133 cp = NULL;
134 if (lstat(pbuf, &sbuf) == -1)
135 cp = ".rhosts lstat failed";
136 else if (!S_ISREG(sbuf.st_mode))
137 cp = ".rhosts not regular file";
138 else if (fstat(fileno(hostf), &sbuf) == -1)
139 cp = ".rhosts fstat failed";
140 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
141 cp = "bad .rhosts owner";
142 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
143 cp = ".rhosts writable by other than owner";
144 /* If there were any problems, quit. */
145 if (cp) {
146 (void)fclose(hostf);
147 return (-1);
148 }
149 goto again;
150 }
151 return (-1);
152}
153
154int
155__ivaliduser_sa(FILE *hostf, struct sockaddr *raddr, socklen_t salen,
156 const char *luser, const char *ruser)
157{
158 char *user, *p;
159 char *buf;
160 const char *auser, *ahost;
161 int hostok, userok;
162 char *rhost = (char *)-1;
163 char domain[HOST_NAME_MAX+1];
164 size_t buflen;
165
166 getdomainname(domain, sizeof(domain));
167
168 while ((buf = fgetln(hostf, &buflen))) {
169 p = buf;
170 if (*p == '#')
171 continue;
172 while (p < buf + buflen && *p != '\n' && *p != ' ' && *p != '\t') {
173 if (!isprint((unsigned char)*p))
174 goto bail;
175 *p = isupper((unsigned char)*p) ?
176 tolower((unsigned char)*p) : *p;
177 p++;
178 }
179 if (p >= buf + buflen)
180 continue;
181 if (*p == ' ' || *p == '\t') {
182 *p++ = '\0';
183 while (p < buf + buflen && (*p == ' ' || *p == '\t'))
184 p++;
185 if (p >= buf + buflen)
186 continue;
187 user = p;
188 while (p < buf + buflen && *p != '\n' && *p != ' ' &&
189 *p != '\t') {
190 if (!isprint((unsigned char)*p))
191 goto bail;
192 p++;
193 }
194 } else
195 user = p;
196 *p = '\0';
197
198 if (p == buf)
199 continue;
200
201 auser = *user ? user : luser;
202 ahost = buf;
203
204 if (strlen(ahost) > HOST_NAME_MAX)
205 continue;
206
207 /*
208 * innetgr() must lookup a hostname (we do not attempt
209 * to change the semantics so that netgroups may have
210 * #.#.#.# addresses in the list.)
211 */
212 if (ahost[0] == '+')
213 switch (ahost[1]) {
214 case '\0':
215 hostok = 1;
216 break;
217 case '@':
218 if (rhost == (char *)-1)
219 rhost = __gethostloop(raddr, salen);
220 hostok = 0;
221 if (rhost)
222 hostok = innetgr(&ahost[2], rhost,
223 NULL, domain);
224 break;
225 default:
226 hostok = __icheckhost(raddr, salen, &ahost[1]);
227 break;
228 }
229 else if (ahost[0] == '-')
230 switch (ahost[1]) {
231 case '\0':
232 hostok = -1;
233 break;
234 case '@':
235 if (rhost == (char *)-1)
236 rhost = __gethostloop(raddr, salen);
237 hostok = 0;
238 if (rhost)
239 hostok = -innetgr(&ahost[2], rhost,
240 NULL, domain);
241 break;
242 default:
243 hostok = -__icheckhost(raddr, salen, &ahost[1]);
244 break;
245 }
246 else
247 hostok = __icheckhost(raddr, salen, ahost);
248
249
250 if (auser[0] == '+')
251 switch (auser[1]) {
252 case '\0':
253 userok = 1;
254 break;
255 case '@':
256 userok = innetgr(&auser[2], NULL, ruser,
257 domain);
258 break;
259 default:
260 userok = strcmp(ruser, &auser[1]) ? 0 : 1;
261 break;
262 }
263 else if (auser[0] == '-')
264 switch (auser[1]) {
265 case '\0':
266 userok = -1;
267 break;
268 case '@':
269 userok = -innetgr(&auser[2], NULL, ruser,
270 domain);
271 break;
272 default:
273 userok = strcmp(ruser, &auser[1]) ? 0 : -1;
274 break;
275 }
276 else
277 userok = strcmp(ruser, auser) ? 0 : 1;
278
279 /* Check if one component did not match */
280 if (hostok == 0 || userok == 0)
281 continue;
282
283 /* Check if we got a forbidden pair */
284 if (userok <= -1 || hostok <= -1)
285 return (-1);
286
287 /* Check if we got a valid pair */
288 if (hostok >= 1 && userok >= 1)
289 return (0);
290 }
291bail:
292 return (-1);
293}
294
295/*
296 * Returns "true" if match, 0 if no match. If we do not find any
297 * semblance of an A->PTR->A loop, allow a simple #.#.#.# match to work.
298 */
299static int
300__icheckhost(struct sockaddr *raddr, socklen_t salen, const char *lhost)
301{
302 struct addrinfo hints, *res, *r;
303 char h1[NI_MAXHOST], h2[NI_MAXHOST];
304 int error;
305 const int niflags = NI_NUMERICHOST;
306
307 h1[0] = '\0';
308 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
309 niflags) != 0)
310 return (0);
311
312 /* Resolve laddr into sockaddr */
313 memset(&hints, 0, sizeof(hints));
314 hints.ai_family = raddr->sa_family;
315 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
316 res = NULL;
317 error = getaddrinfo(lhost, "0", &hints, &res);
318 if (error)
319 return (0);
320
321 /*
322 * Try string comparisons between raddr and laddr.
323 */
324 for (r = res; r; r = r->ai_next) {
325 h2[0] = '\0';
326 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
327 NULL, 0, niflags) != 0)
328 continue;
329 if (strcmp(h1, h2) == 0) {
330 freeaddrinfo(res);
331 return (1);
332 }
333 }
334
335 /* No match. */
336 freeaddrinfo(res);
337 return (0);
338}
339
340/*
341 * Return the hostname associated with the supplied address.
342 * Do a reverse lookup as well for security. If a loop cannot
343 * be found, pack the result of inet_ntoa() into the string.
344 */
345static char *
346__gethostloop(struct sockaddr *raddr, socklen_t salen)
347{
348 static char remotehost[NI_MAXHOST];
349 char h1[NI_MAXHOST], h2[NI_MAXHOST];
350 struct addrinfo hints, *res, *r;
351 int error;
352 const int niflags = NI_NUMERICHOST;
353
354 h1[0] = remotehost[0] = '\0';
355 if (getnameinfo(raddr, salen, remotehost, sizeof(remotehost),
356 NULL, 0, NI_NAMEREQD) != 0)
357 return (NULL);
358 if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
359 niflags) != 0)
360 return (NULL);
361
362 /*
363 * Look up the name and check that the supplied
364 * address is in the list
365 */
366 memset(&hints, 0, sizeof(hints));
367 hints.ai_family = raddr->sa_family;
368 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
369 hints.ai_flags = AI_CANONNAME;
370 res = NULL;
371 error = getaddrinfo(remotehost, "0", &hints, &res);
372 if (error)
373 return (NULL);
374
375 for (r = res; r; r = r->ai_next) {
376 h2[0] = '\0';
377 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
378 NULL, 0, niflags) != 0)
379 continue;
380 if (strcmp(h1, h2) == 0) {
381 freeaddrinfo(res);
382 return (remotehost);
383 }
384 }
385
386 /*
387 * either the DNS adminstrator has made a configuration
388 * mistake, or someone has attempted to spoof us
389 */
390 freeaddrinfo(res);
391 return (NULL);
392}
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