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
58 static int uid;
59 static int euid;
60
61 void
ID0init()62 ID0init()
63 {
64 uid = getuid();
65 euid = geteuid();
66 }
67
68 static void
ID0setuser(void)69 ID0setuser(void)
70 {
71 if (seteuid(uid) == -1) {
72 log_Printf(LogERROR, "ID0setuser: Unable to seteuid!\n");
73 AbortProgram(EX_NOPERM);
74 }
75 }
76
77 uid_t
ID0realuid()78 ID0realuid()
79 {
80 return uid;
81 }
82
83 static void
ID0set0(void)84 ID0set0(void)
85 {
86 if (seteuid(euid) == -1) {
87 log_Printf(LogERROR, "ID0set0: Unable to seteuid!\n");
88 AbortProgram(EX_NOPERM);
89 }
90 }
91
92 int
ID0ioctl(int fd,unsigned long req,void * arg)93 ID0ioctl(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
104 int
ID0unlink(const char * name)105 ID0unlink(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
116 int
ID0socket(int domain,int type,int protocol)117 ID0socket(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
128 FILE *
ID0fopen(const char * path,const char * mode)129 ID0fopen(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
140 int
ID0open(const char * path,int flags,...)141 ID0open(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
155 int
ID0write(int fd,const void * data,size_t len)156 ID0write(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
167 int
ID0uu_lock(const char * basettyname)168 ID0uu_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
179 int
ID0uu_lock_txfr(const char * basettyname,pid_t newpid)180 ID0uu_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
192 int
ID0uu_unlock(const char * basettyname)193 ID0uu_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
204 void
ID0login(struct utmp * ut)205 ID0login(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
219 void
ID0logout(const char * device,int nologout)220 ID0logout(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
238 int
ID0bind_un(int s,const struct sockaddr_un * name)239 ID0bind_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
251 int
ID0connect_un(int s,const struct sockaddr_un * name)252 ID0connect_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
264 int
ID0kill(pid_t pid,int sig)265 ID0kill(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)
277 int
ID0kldload(const char * dev)278 ID0kldload(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
291 int
ID0NgMkSockNode(const char * name,int * cs,int * ds)292 ID0NgMkSockNode(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