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 1.23.40.1 2010/12/21 17:10:29 kensmith Exp $
27 */
28
29#include <sys/param.h>
30#include <sys/socket.h>
31#include <sys/un.h>
32
33#include <sys/ioctl.h>
34#include <fcntl.h>
35#ifndef NONETGRAPH
36#include <netgraph.h>
37#endif
38#include <signal.h>
39#include <stdarg.h>
40#include <stdio.h>
41#include <string.h>
42#include <sysexits.h>
43#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
44#include <sys/linker.h>
45#endif
46#include <unistd.h>
47#ifdef __OpenBSD__
48#include <util.h>
49#else
50#include <libutil.h>
51#endif
52#include <utmp.h>
53
54#include "log.h"
55#include "main.h"
56#include "id.h"
57
58static int uid;
59static int euid;
60
61void
62ID0init()
63{
64  uid = getuid();
65  euid = geteuid();
66}
67
68static void
69ID0setuser(void)
70{
71  if (seteuid(uid) == -1) {
72    log_Printf(LogERROR, "ID0setuser: Unable to seteuid!\n");
73    AbortProgram(EX_NOPERM);
74  }
75}
76
77uid_t
78ID0realuid()
79{
80  return uid;
81}
82
83static void
84ID0set0(void)
85{
86  if (seteuid(euid) == -1) {
87    log_Printf(LogERROR, "ID0set0: Unable to seteuid!\n");
88    AbortProgram(EX_NOPERM);
89  }
90}
91
92int
93ID0ioctl(int fd, unsigned long req, void *arg)
94{
95  int ret;
96
97  ID0set0();
98  ret = ioctl(fd, req, arg);
99  log_Printf(LogID0, "%d = ioctl(%d, %lu, %p)\n", ret, fd, req, arg);
100  ID0setuser();
101  return ret;
102}
103
104int
105ID0unlink(const char *name)
106{
107  int ret;
108
109  ID0set0();
110  ret = unlink(name);
111  log_Printf(LogID0, "%d = unlink(\"%s\")\n", ret, name);
112  ID0setuser();
113  return ret;
114}
115
116int
117ID0socket(int domain, int type, int protocol)
118{
119  int ret;
120
121  ID0set0();
122  ret = socket(domain, type, protocol);
123  log_Printf(LogID0, "%d = socket(%d, %d, %d)\n", ret, domain, type, protocol);
124  ID0setuser();
125  return ret;
126}
127
128FILE *
129ID0fopen(const char *path, const char *mode)
130{
131  FILE *ret;
132
133  ID0set0();
134  ret = fopen(path, mode);
135  log_Printf(LogID0, "%p = fopen(\"%s\", \"%s\")\n", ret, path, mode);
136  ID0setuser();
137  return ret;
138}
139
140int
141ID0open(const char *path, int flags, ...)
142{
143  int ret;
144  va_list ap;
145
146  va_start(ap, flags);
147  ID0set0();
148  ret = open(path, flags, va_arg(ap, int));
149  log_Printf(LogID0, "%d = open(\"%s\", %d)\n", ret, path, flags);
150  ID0setuser();
151  va_end(ap);
152  return ret;
153}
154
155int
156ID0write(int fd, const void *data, size_t len)
157{
158  int ret;
159
160  ID0set0();
161  ret = write(fd, data, len);
162  log_Printf(LogID0, "%d = write(%d, data, %ld)\n", ret, fd, (long)len);
163  ID0setuser();
164  return ret;
165}
166
167int
168ID0uu_lock(const char *basettyname)
169{
170  int ret;
171
172  ID0set0();
173  ret = uu_lock(basettyname);
174  log_Printf(LogID0, "%d = uu_lock(\"%s\")\n", ret, basettyname);
175  ID0setuser();
176  return ret;
177}
178
179int
180ID0uu_lock_txfr(const char *basettyname, pid_t newpid)
181{
182  int ret;
183
184  ID0set0();
185  ret = uu_lock_txfr(basettyname, newpid);
186  log_Printf(LogID0, "%d = uu_lock_txfr(\"%s\", %ld)\n", ret, basettyname,
187             (long)newpid);
188  ID0setuser();
189  return ret;
190}
191
192int
193ID0uu_unlock(const char *basettyname)
194{
195  int ret;
196
197  ID0set0();
198  ret = uu_unlock(basettyname);
199  log_Printf(LogID0, "%d = uu_unlock(\"%s\")\n", ret, basettyname);
200  ID0setuser();
201  return ret;
202}
203
204void
205ID0login(struct utmp *ut)
206{
207  ID0set0();
208  if (logout(ut->ut_line)) {
209    log_Printf(LogID0, "logout(\"%s\")\n", ut->ut_line);
210    logwtmp(ut->ut_line, "", "");
211    log_Printf(LogID0, "logwtmp(\"%s\", \"\", \"\")\n", ut->ut_line);
212  }
213  login(ut);
214  log_Printf(LogID0, "login(\"%s\", \"%.*s\")\n",
215            ut->ut_line, (int)(sizeof ut->ut_name), ut->ut_name);
216  ID0setuser();
217}
218
219void
220ID0logout(const char *device, int nologout)
221{
222  struct utmp ut;
223  char ut_line[sizeof ut.ut_line + 1];
224
225  strncpy(ut_line, device, sizeof ut_line - 1);
226  ut_line[sizeof ut_line - 1] = '\0';
227
228  ID0set0();
229  if (nologout || logout(ut_line)) {
230    log_Printf(LogID0, "logout(\"%s\")\n", ut_line);
231    logwtmp(ut_line, "", "");
232    log_Printf(LogID0, "logwtmp(\"%s\", \"\", \"\")\n", ut_line);
233  } else
234    log_Printf(LogERROR, "ID0logout: No longer logged in on %s\n", ut_line);
235  ID0setuser();
236}
237
238int
239ID0bind_un(int s, const struct sockaddr_un *name)
240{
241  int result;
242
243  ID0set0();
244  result = bind(s, (const struct sockaddr *)name, sizeof *name);
245  log_Printf(LogID0, "%d = bind(%d, \"%s\", %d)\n",
246            result, s, name->sun_path, (int)sizeof(*name));
247  ID0setuser();
248  return result;
249}
250
251int
252ID0connect_un(int s, const struct sockaddr_un *name)
253{
254  int result;
255
256  ID0set0();
257  result = connect(s, (const struct sockaddr *)name, sizeof *name);
258  log_Printf(LogID0, "%d = connect(%d, \"%s\", %d)\n",
259            result, s, name->sun_path, (int)sizeof(*name));
260  ID0setuser();
261  return result;
262}
263
264int
265ID0kill(pid_t pid, int sig)
266{
267  int result;
268
269  ID0set0();
270  result = kill(pid, sig);
271  log_Printf(LogID0, "%d = kill(%ld, %d)\n", result, (long)pid, sig);
272  ID0setuser();
273  return result;
274}
275
276#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
277int
278ID0kldload(const char *dev)
279{
280  int result;
281
282  ID0set0();
283  result = kldload(dev);
284  log_Printf(LogID0, "%d = kldload(\"%s\")\n", result, dev);
285  ID0setuser();
286  return result;
287}
288#endif
289
290#ifndef NONETGRAPH
291int
292ID0NgMkSockNode(const char *name, int *cs, int *ds)
293{
294  int result;
295
296  ID0set0();
297  result = NgMkSockNode(name, cs, ds);
298  log_Printf(LogID0, "%d = NgMkSockNode(\"%s\", &cs, &ds)\n",
299             result, name ? name : "");
300  ID0setuser();
301  return result;
302}
303#endif
304