1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user or with the express written consent of 8 * Sun Microsystems, Inc. 9 * 10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 13 * 14 * Sun RPC is provided with no support and without any obligation on the 15 * part of Sun Microsystems, Inc. to assist in its use, correction, 16 * modification or enhancement. 17 * 18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 20 * OR ANY PART THEREOF. 21 * 22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 23 * or profits or other special, indirect and consequential damages, even if 24 * Sun has been advised of the possibility of such damages. 25 * 26 * Sun Microsystems, Inc. 27 * 2550 Garcia Avenue 28 * Mountain View, California 94043 29 * 30 * @(#)update.c 1.2 91/03/11 Copyr 1986 Sun Micro 31 * $FreeBSD: src/usr.sbin/rpc.ypupdated/update.c,v 1.8 2007/02/15 02:45:14 trhodes Exp $ 32 * $DragonFly: src/usr.sbin/rpc.ypupdated/update.c,v 1.4 2005/11/25 00:32:49 swildner Exp $ 33 */ 34 35 /* 36 * Copyright (C) 1986, 1989, Sun Microsystems, Inc. 37 */ 38 39 /* 40 * Administrative tool to add a new user to the publickey database 41 */ 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 #include <rpc/rpc.h> 46 #include <rpc/key_prot.h> 47 #ifdef YP 48 #include <rpcsvc/yp_prot.h> 49 #include <rpcsvc/ypclnt.h> 50 #include <sys/wait.h> 51 #include <netdb.h> 52 #endif /* YP */ 53 #include <pwd.h> 54 #include <string.h> 55 #include <sys/resource.h> 56 #include <stdlib.h> 57 #include "ypupdated_extern.h" 58 59 #ifdef YP 60 #define MAXMAPNAMELEN 256 61 #else 62 #define YPOP_CHANGE 1 /* change, do not add */ 63 #define YPOP_INSERT 2 /* add, do not change */ 64 #define YPOP_DELETE 3 /* delete this entry */ 65 #define YPOP_STORE 4 /* add, or change */ 66 #endif 67 68 #ifdef YP 69 static char SHELL[] = "/bin/sh"; 70 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */ 71 static char PKMAP[] = "publickey.byname"; 72 static char UPDATEFILE[] = "updaters"; 73 static char PKFILE[] = "/etc/publickey"; 74 #endif /* YP */ 75 76 #ifdef YP 77 static int _openchild(char *, FILE **, FILE **); 78 79 /* 80 * Determine if requester is allowed to update the given map, 81 * and update it if so. Returns the yp status, which is zero 82 * if there is no access violation. 83 */ 84 int 85 mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key, 86 u_int datalen, char *data) 87 { 88 char updater[MAXMAPNAMELEN + 40]; 89 FILE *childargs; 90 FILE *childrslt; 91 #ifdef WEXITSTATUS 92 int status; 93 #else 94 union wait status; 95 #endif 96 pid_t pid; 97 u_int yperrno; 98 99 100 #ifdef DEBUG 101 printf("%s %s\n", key, data); 102 #endif 103 sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */ 104 UPDATEFILE, mapname); 105 pid = _openchild(updater, &childargs, &childrslt); 106 if (pid < 0) { 107 return (YPERR_YPERR); 108 } 109 110 /* 111 * Write to child 112 */ 113 fprintf(childargs, "%s\n", requester); 114 fprintf(childargs, "%u\n", op); 115 fprintf(childargs, "%u\n", keylen); 116 fwrite(key, (int)keylen, 1, childargs); 117 fprintf(childargs, "\n"); 118 fprintf(childargs, "%u\n", datalen); 119 fwrite(data, (int)datalen, 1, childargs); 120 fprintf(childargs, "\n"); 121 fclose(childargs); 122 123 /* 124 * Read from child 125 */ 126 fscanf(childrslt, "%d", &yperrno); 127 fclose(childrslt); 128 129 wait(&status); 130 #ifdef WEXITSTATUS 131 if (WEXITSTATUS(status) != 0) 132 #else 133 if (status.w_retcode != 0) 134 #endif 135 return (YPERR_YPERR); 136 return (yperrno); 137 } 138 139 /* 140 * returns pid, or -1 for failure 141 */ 142 static int 143 _openchild(char *command, FILE **fto, FILE **ffrom) 144 { 145 int i; 146 pid_t pid; 147 int pdto[2]; 148 int pdfrom[2]; 149 char *com; 150 struct rlimit rl; 151 152 if (pipe(pdto) < 0) { 153 goto error1; 154 } 155 if (pipe(pdfrom) < 0) { 156 goto error2; 157 } 158 switch (pid = fork()) { 159 case -1: 160 goto error3; 161 162 case 0: 163 /* 164 * child: read from pdto[0], write into pdfrom[1] 165 */ 166 close(0); 167 dup(pdto[0]); 168 close(1); 169 dup(pdfrom[1]); 170 getrlimit(RLIMIT_NOFILE, &rl); 171 for (i = rl.rlim_max - 1; i >= 3; i--) { 172 close(i); 173 } 174 com = malloc((unsigned) strlen(command) + 6); 175 if (com == NULL) { 176 _exit(~0); 177 } 178 sprintf(com, "exec %s", command); 179 execl(SHELL, basename(SHELL), "-c", com, NULL); 180 _exit(~0); 181 182 default: 183 /* 184 * parent: write into pdto[1], read from pdfrom[0] 185 */ 186 *fto = fdopen(pdto[1], "w"); 187 close(pdto[0]); 188 *ffrom = fdopen(pdfrom[0], "r"); 189 close(pdfrom[1]); 190 break; 191 } 192 return (pid); 193 194 /* 195 * error cleanup and return 196 */ 197 error3: 198 close(pdfrom[0]); 199 close(pdfrom[1]); 200 error2: 201 close(pdto[0]); 202 close(pdto[1]); 203 error1: 204 return (-1); 205 } 206 207 static char * 208 basename(char *path) 209 { 210 char *p; 211 212 p = strrchr(path, '/'); 213 if (p == NULL) { 214 return (path); 215 } else { 216 return (p + 1); 217 } 218 } 219 220 #else /* YP */ 221 222 static int match(char *, char *); 223 224 /* 225 * Determine if requester is allowed to update the given map, 226 * and update it if so. Returns the status, which is zero 227 * if there is no access violation. This function updates 228 * the local file and then shuts up. 229 */ 230 int 231 localupdate(char *name, char *filename, u_int op, u_int keylen __unused, 232 char *key, u_int datalen __unused, char *data) 233 { 234 char line[256]; 235 FILE *rf; 236 FILE *wf; 237 char *tmpname; 238 int err; 239 240 /* 241 * Check permission 242 */ 243 if (strcmp(name, key) != 0) { 244 return (ERR_ACCESS); 245 } 246 if (strcmp(name, "nobody") == 0) { 247 /* 248 * Can't change "nobody"s key. 249 */ 250 return (ERR_ACCESS); 251 } 252 253 /* 254 * Open files 255 */ 256 tmpname = malloc(strlen(filename) + 4); 257 if (tmpname == NULL) { 258 return (ERR_MALLOC); 259 } 260 sprintf(tmpname, "%s.tmp", filename); 261 rf = fopen(filename, "r"); 262 if (rf == NULL) { 263 return (ERR_READ); 264 } 265 wf = fopen(tmpname, "w"); 266 if (wf == NULL) { 267 return (ERR_WRITE); 268 } 269 err = -1; 270 while (fgets(line, sizeof (line), rf)) { 271 if (err < 0 && match(line, name)) { 272 switch (op) { 273 case YPOP_INSERT: 274 err = ERR_KEY; 275 break; 276 case YPOP_STORE: 277 case YPOP_CHANGE: 278 fprintf(wf, "%s %s\n", key, data); 279 err = 0; 280 break; 281 case YPOP_DELETE: 282 /* do nothing */ 283 err = 0; 284 break; 285 } 286 } else { 287 fputs(line, wf); 288 } 289 } 290 if (err < 0) { 291 switch (op) { 292 case YPOP_CHANGE: 293 case YPOP_DELETE: 294 err = ERR_KEY; 295 break; 296 case YPOP_INSERT: 297 case YPOP_STORE: 298 err = 0; 299 fprintf(wf, "%s %s\n", key, data); 300 break; 301 } 302 } 303 fclose(wf); 304 fclose(rf); 305 if (err == 0) { 306 if (rename(tmpname, filename) < 0) { 307 return (ERR_DBASE); 308 } 309 } else { 310 if (unlink(tmpname) < 0) { 311 return (ERR_DBASE); 312 } 313 } 314 return (err); 315 } 316 317 static int 318 match(char *line, char *name) 319 { 320 int len; 321 322 len = strlen(name); 323 return (strncmp(line, name, len) == 0 && 324 (line[len] == ' ' || line[len] == '\t')); 325 } 326 #endif /* !YP */ 327