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 1.4.2.1 2002/02/15 00:46:57 des 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 mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key, 85 u_int datalen, char *data) 86 { 87 char updater[MAXMAPNAMELEN + 40]; 88 FILE *childargs; 89 FILE *childrslt; 90 #ifdef WEXITSTATUS 91 int status; 92 #else 93 union wait status; 94 #endif 95 pid_t pid; 96 u_int yperrno; 97 98 99 #ifdef DEBUG 100 printf("%s %s\n", key, data); 101 #endif 102 sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */ 103 UPDATEFILE, mapname); 104 pid = _openchild(updater, &childargs, &childrslt); 105 if (pid < 0) { 106 return (YPERR_YPERR); 107 } 108 109 /* 110 * Write to child 111 */ 112 fprintf(childargs, "%s\n", requester); 113 fprintf(childargs, "%u\n", op); 114 fprintf(childargs, "%u\n", keylen); 115 fwrite(key, (int)keylen, 1, childargs); 116 fprintf(childargs, "\n"); 117 fprintf(childargs, "%u\n", datalen); 118 fwrite(data, (int)datalen, 1, childargs); 119 fprintf(childargs, "\n"); 120 fclose(childargs); 121 122 /* 123 * Read from child 124 */ 125 fscanf(childrslt, "%d", &yperrno); 126 fclose(childrslt); 127 128 wait(&status); 129 #ifdef WEXITSTATUS 130 if (WEXITSTATUS(status) != 0) { 131 #else 132 if (status.w_retcode != 0) { 133 #endif 134 return (YPERR_YPERR); 135 } 136 return (yperrno); 137 } 138 139 /* 140 * returns pid, or -1 for failure 141 */ 142 static 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 #ifdef VFORK 159 switch (pid = vfork()) { 160 #else 161 switch (pid = fork()) { 162 #endif 163 case -1: 164 goto error3; 165 166 case 0: 167 /* 168 * child: read from pdto[0], write into pdfrom[1] 169 */ 170 close(0); 171 dup(pdto[0]); 172 close(1); 173 dup(pdfrom[1]); 174 getrlimit(RLIMIT_NOFILE, &rl); 175 for (i = rl.rlim_max - 1; i >= 3; i--) { 176 close(i); 177 } 178 com = malloc((unsigned) strlen(command) + 6); 179 if (com == NULL) { 180 _exit(~0); 181 } 182 sprintf(com, "exec %s", command); 183 execl(SHELL, basename(SHELL), "-c", com, NULL); 184 _exit(~0); 185 186 default: 187 /* 188 * parent: write into pdto[1], read from pdfrom[0] 189 */ 190 *fto = fdopen(pdto[1], "w"); 191 close(pdto[0]); 192 *ffrom = fdopen(pdfrom[0], "r"); 193 close(pdfrom[1]); 194 break; 195 } 196 return (pid); 197 198 /* 199 * error cleanup and return 200 */ 201 error3: 202 close(pdfrom[0]); 203 close(pdfrom[1]); 204 error2: 205 close(pdto[0]); 206 close(pdto[1]); 207 error1: 208 return (-1); 209 } 210 211 static char * 212 basename(char *path) 213 { 214 char *p; 215 216 p = strrchr(path, '/'); 217 if (p == NULL) { 218 return (path); 219 } else { 220 return (p + 1); 221 } 222 } 223 224 #else /* YP */ 225 226 #ifdef foo 227 #define ERR_ACCESS 1 228 #define ERR_MALLOC 2 229 #define ERR_READ 3 230 #define ERR_WRITE 4 231 #define ERR_DBASE 5 232 #define ERR_KEY 6 233 extern char *malloc(); 234 #endif 235 236 static int match(char *, char *); 237 238 /* 239 * Determine if requester is allowed to update the given map, 240 * and update it if so. Returns the status, which is zero 241 * if there is no access violation. This function updates 242 * the local file and then shuts up. 243 * 244 * Parameters: 245 * name: Name of the requestor 246 * keylen: Not used 247 * datalen: Not used 248 */ 249 int 250 localupdate(char *name, char *filename, u_int op, u_int keylen, char *key, 251 u_int datalen, char *data) 252 { 253 char line[256]; 254 FILE *rf; 255 FILE *wf; 256 char *tmpname; 257 int err; 258 259 /* 260 * Check permission 261 */ 262 if (strcmp(name, key) != 0) { 263 return (ERR_ACCESS); 264 } 265 if (strcmp(name, "nobody") == 0) { 266 /* 267 * Can't change "nobody"s key. 268 */ 269 return (ERR_ACCESS); 270 } 271 272 /* 273 * Open files 274 */ 275 tmpname = malloc(strlen(filename) + 4); 276 if (tmpname == NULL) { 277 return (ERR_MALLOC); 278 } 279 sprintf(tmpname, "%s.tmp", filename); 280 rf = fopen(filename, "r"); 281 if (rf == NULL) { 282 return (ERR_READ); 283 } 284 wf = fopen(tmpname, "w"); 285 if (wf == NULL) { 286 return (ERR_WRITE); 287 } 288 err = -1; 289 while (fgets(line, sizeof (line), rf)) { 290 if (err < 0 && match(line, name)) { 291 switch (op) { 292 case YPOP_INSERT: 293 err = ERR_KEY; 294 break; 295 case YPOP_STORE: 296 case YPOP_CHANGE: 297 fprintf(wf, "%s %s\n", key, data); 298 err = 0; 299 break; 300 case YPOP_DELETE: 301 /* do nothing */ 302 err = 0; 303 break; 304 } 305 } else { 306 fputs(line, wf); 307 } 308 } 309 if (err < 0) { 310 switch (op) { 311 case YPOP_CHANGE: 312 case YPOP_DELETE: 313 err = ERR_KEY; 314 break; 315 case YPOP_INSERT: 316 case YPOP_STORE: 317 err = 0; 318 fprintf(wf, "%s %s\n", key, data); 319 break; 320 } 321 } 322 fclose(wf); 323 fclose(rf); 324 if (err == 0) { 325 if (rename(tmpname, filename) < 0) { 326 return (ERR_DBASE); 327 } 328 } else { 329 if (unlink(tmpname) < 0) { 330 return (ERR_DBASE); 331 } 332 } 333 return (err); 334 } 335 336 static int 337 match(char *line, char *name) 338 { 339 int len; 340 341 len = strlen(name); 342 return (strncmp(line, name, len) == 0 && 343 (line[len] == ' ' || line[len] == '\t')); 344 } 345 #endif /* !YP */ 346 347