1 /*- 2 * Copyright (c) 1997 Brian Somers <brian (at) 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 62 ID0init() 63 { 64 uid = getuid(); 65 euid = geteuid(); 66 } 67 68 static 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 78 ID0realuid() 79 { 80 return uid; 81 } 82 83 static 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 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 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 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 * 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 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 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 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 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 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 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 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 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 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 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 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 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
