xref: /dragonfly/usr.sbin/ppp/id.c (revision 1de703da) 
1 /*-
2  * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD: src/usr.sbin/ppp/id.c,v 1.18.2.3 2002/09/01 02:12:27 brian Exp $
27  * $DragonFly: src/usr.sbin/ppp/id.c,v 1.2 2003/06/17 04:30:00 dillon Exp $
28  */
29 
30 #include <sys/param.h>
31 #include <sys/socket.h>
32 #include <sys/un.h>
33 
34 #include <sys/ioctl.h>
35 #include <fcntl.h>
36 #ifndef NONETGRAPH
37 #include <netgraph.h>
38 #endif
39 #include <signal.h>
40 #include <stdarg.h>
41 #include <stdio.h>
42 #include <string.h>
43 #include <sysexits.h>
44 #if defined(__FreeBSD__) && !defined(NOKLDLOAD)
45 #include <sys/linker.h>
46 #endif
47 #include <unistd.h>
48 #ifdef __OpenBSD__
49 #include <util.h>
50 #else
51 #include <libutil.h>
52 #endif
53 #include <utmp.h>
54 
55 #include "log.h"
56 #include "main.h"
57 #include "id.h"
58 
59 static int uid;
60 static int euid;
61 
62 void
63 ID0init()
64 {
65   uid = getuid();
66   euid = geteuid();
67 }
68 
69 static void
70 ID0setuser(void)
71 {
72   if (seteuid(uid) == -1) {
73     log_Printf(LogERROR, "ID0setuser: Unable to seteuid!\n");
74     AbortProgram(EX_NOPERM);
75   }
76 }
77 
78 uid_t
79 ID0realuid()
80 {
81   return uid;
82 }
83 
84 static void
85 ID0set0(void)
86 {
87   if (seteuid(euid) == -1) {
88     log_Printf(LogERROR, "ID0set0: Unable to seteuid!\n");
89     AbortProgram(EX_NOPERM);
90   }
91 }
92 
93 int
94 ID0ioctl(int fd, unsigned long req, void *arg)
95 {
96   int ret;
97 
98   ID0set0();
99   ret = ioctl(fd, req, arg);
100   log_Printf(LogID0, "%d = ioctl(%d, %lu, %p)\n", ret, fd, req, arg);
101   ID0setuser();
102   return ret;
103 }
104 
105 int
106 ID0unlink(const char *name)
107 {
108   int ret;
109 
110   ID0set0();
111   ret = unlink(name);
112   log_Printf(LogID0, "%d = unlink(\"%s\")\n", ret, name);
113   ID0setuser();
114   return ret;
115 }
116 
117 int
118 ID0socket(int domain, int type, int protocol)
119 {
120   int ret;
121 
122   ID0set0();
123   ret = socket(domain, type, protocol);
124   log_Printf(LogID0, "%d = socket(%d, %d, %d)\n", ret, domain, type, protocol);
125   ID0setuser();
126   return ret;
127 }
128 
129 FILE *
130 ID0fopen(const char *path, const char *mode)
131 {
132   FILE *ret;
133 
134   ID0set0();
135   ret = fopen(path, mode);
136   log_Printf(LogID0, "%p = fopen(\"%s\", \"%s\")\n", ret, path, mode);
137   ID0setuser();
138   return ret;
139 }
140 
141 int
142 ID0open(const char *path, int flags, ...)
143 {
144   int ret;
145   va_list ap;
146 
147   va_start(ap, flags);
148   ID0set0();
149   ret = open(path, flags, va_arg(ap, int));
150   log_Printf(LogID0, "%d = open(\"%s\", %d)\n", ret, path, flags);
151   ID0setuser();
152   va_end(ap);
153   return ret;
154 }
155 
156 int
157 ID0write(int fd, const void *data, size_t len)
158 {
159   int ret;
160 
161   ID0set0();
162   ret = write(fd, data, len);
163   log_Printf(LogID0, "%d = write(%d, data, %ld)\n", ret, fd, (long)len);
164   ID0setuser();
165   return ret;
166 }
167 
168 int
169 ID0uu_lock(const char *basettyname)
170 {
171   int ret;
172 
173   ID0set0();
174   ret = uu_lock(basettyname);
175   log_Printf(LogID0, "%d = uu_lock(\"%s\")\n", ret, basettyname);
176   ID0setuser();
177   return ret;
178 }
179 
180 int
181 ID0uu_lock_txfr(const char *basettyname, pid_t newpid)
182 {
183   int ret;
184 
185   ID0set0();
186   ret = uu_lock_txfr(basettyname, newpid);
187   log_Printf(LogID0, "%d = uu_lock_txfr(\"%s\", %ld)\n", ret, basettyname,
188              (long)newpid);
189   ID0setuser();
190   return ret;
191 }
192 
193 int
194 ID0uu_unlock(const char *basettyname)
195 {
196   int ret;
197 
198   ID0set0();
199   ret = uu_unlock(basettyname);
200   log_Printf(LogID0, "%d = uu_unlock(\"%s\")\n", ret, basettyname);
201   ID0setuser();
202   return ret;
203 }
204 
205 void
206 ID0login(struct utmp *ut)
207 {
208   ID0set0();
209   if (logout(ut->ut_line)) {
210     log_Printf(LogID0, "logout(\"%s\")\n", ut->ut_line);
211     logwtmp(ut->ut_line, "", "");
212     log_Printf(LogID0, "logwtmp(\"%s\", \"\", \"\")\n", ut->ut_line);
213   }
214   login(ut);
215   log_Printf(LogID0, "login(\"%s\", \"%.*s\")\n",
216             ut->ut_line, (int)(sizeof ut->ut_name), ut->ut_name);
217   ID0setuser();
218 }
219 
220 void
221 ID0logout(const char *device, int nologout)
222 {
223   struct utmp ut;
224   char ut_line[sizeof ut.ut_line + 1];
225 
226   strncpy(ut_line, device, sizeof ut_line - 1);
227   ut_line[sizeof ut_line - 1] = '\0';
228 
229   ID0set0();
230   if (nologout || logout(ut_line)) {
231     log_Printf(LogID0, "logout(\"%s\")\n", ut_line);
232     logwtmp(ut_line, "", "");
233     log_Printf(LogID0, "logwtmp(\"%s\", \"\", \"\")\n", ut_line);
234   } else
235     log_Printf(LogERROR, "ID0logout: No longer logged in on %s\n", ut_line);
236   ID0setuser();
237 }
238 
239 int
240 ID0bind_un(int s, const struct sockaddr_un *name)
241 {
242   int result;
243 
244   ID0set0();
245   result = bind(s, (const struct sockaddr *)name, sizeof *name);
246   log_Printf(LogID0, "%d = bind(%d, \"%s\", %d)\n",
247             result, s, name->sun_path, (int)sizeof(*name));
248   ID0setuser();
249   return result;
250 }
251 
252 int
253 ID0connect_un(int s, const struct sockaddr_un *name)
254 {
255   int result;
256 
257   ID0set0();
258   result = connect(s, (const struct sockaddr *)name, sizeof *name);
259   log_Printf(LogID0, "%d = connect(%d, \"%s\", %d)\n",
260             result, s, name->sun_path, (int)sizeof(*name));
261   ID0setuser();
262   return result;
263 }
264 
265 int
266 ID0kill(pid_t pid, int sig)
267 {
268   int result;
269 
270   ID0set0();
271   result = kill(pid, sig);
272   log_Printf(LogID0, "%d = kill(%ld, %d)\n", result, (long)pid, sig);
273   ID0setuser();
274   return result;
275 }
276 
277 #if defined(__FreeBSD__) && !defined(NOKLDLOAD)
278 int
279 ID0kldload(const char *dev)
280 {
281   int result;
282 
283   ID0set0();
284   result = kldload(dev);
285   log_Printf(LogID0, "%d = kldload(\"%s\")\n", result, dev);
286   ID0setuser();
287   return result;
288 }
289 #endif
290 
291 #ifndef NONETGRAPH
292 int
293 ID0NgMkSockNode(const char *name, int *cs, int *ds)
294 {
295   int result;
296 
297   ID0set0();
298   result = NgMkSockNode(name, cs, ds);
299   log_Printf(LogID0, "%d = NgMkSockNode(\"%s\", &cs, &ds)\n",
300              result, name ? name : "");
301   ID0setuser();
302   return result;
303 }
304 #endif
305