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