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 31 #ifndef lint 32 #if 0 33 static char sccsid[] = "@(#)update.c 1.2 91/03/11 Copyr 1986 Sun Micro"; 34 #endif 35 static const char rcsid[] = 36 "$Id$"; 37 #endif /* not lint */ 38 39 /* 40 * Copyright (C) 1986, 1989, Sun Microsystems, Inc. 41 */ 42 43 /* 44 * Administrative tool to add a new user to the publickey database 45 */ 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 #include <rpc/rpc.h> 50 #include <rpc/key_prot.h> 51 #ifdef YP 52 #include <rpcsvc/yp_prot.h> 53 #include <rpcsvc/ypclnt.h> 54 #include <sys/wait.h> 55 #include <netdb.h> 56 #endif /* YP */ 57 #include <pwd.h> 58 #include <string.h> 59 #include <sys/resource.h> 60 #include <stdlib.h> 61 #include "ypupdated_extern.h" 62 63 #ifdef YP 64 #define MAXMAPNAMELEN 256 65 #else 66 #define YPOP_CHANGE 1 /* change, do not add */ 67 #define YPOP_INSERT 2 /* add, do not change */ 68 #define YPOP_DELETE 3 /* delete this entry */ 69 #define YPOP_STORE 4 /* add, or change */ 70 #endif 71 72 #ifdef YP 73 static char SHELL[] = "/bin/sh"; 74 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */ 75 static char PKMAP[] = "publickey.byname"; 76 static char UPDATEFILE[] = "updaters"; 77 static char PKFILE[] = "/etc/publickey"; 78 #endif /* YP */ 79 80 #ifdef YP 81 static int _openchild __P(( char *, FILE **, FILE ** )); 82 83 /* 84 * Determine if requester is allowed to update the given map, 85 * and update it if so. Returns the yp status, which is zero 86 * if there is no access violation. 87 */ 88 mapupdate(requester, mapname, op, keylen, key, datalen, data) 89 char *requester; 90 char *mapname; 91 u_int op; 92 u_int keylen; 93 char *key; 94 u_int datalen; 95 char *data; 96 { 97 char updater[MAXMAPNAMELEN + 40]; 98 FILE *childargs; 99 FILE *childrslt; 100 #ifdef WEXITSTATUS 101 int status; 102 #else 103 union wait status; 104 #endif 105 pid_t pid; 106 u_int yperrno; 107 108 109 #ifdef DEBUG 110 printf("%s %s\n", key, data); 111 #endif 112 (void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */ 113 UPDATEFILE, mapname); 114 pid = _openchild(updater, &childargs, &childrslt); 115 if (pid < 0) { 116 return (YPERR_YPERR); 117 } 118 119 /* 120 * Write to child 121 */ 122 (void)fprintf(childargs, "%s\n", requester); 123 (void)fprintf(childargs, "%u\n", op); 124 (void)fprintf(childargs, "%u\n", keylen); 125 (void)fwrite(key, (int)keylen, 1, childargs); 126 (void)fprintf(childargs, "\n"); 127 (void)fprintf(childargs, "%u\n", datalen); 128 (void)fwrite(data, (int)datalen, 1, childargs); 129 (void)fprintf(childargs, "\n"); 130 (void)fclose(childargs); 131 132 /* 133 * Read from child 134 */ 135 (void)fscanf(childrslt, "%d", &yperrno); 136 (void)fclose(childrslt); 137 138 (void)wait(&status); 139 #ifdef WEXITSTATUS 140 if (WEXITSTATUS(status) != 0) { 141 #else 142 if (status.w_retcode != 0) { 143 #endif 144 return (YPERR_YPERR); 145 } 146 return (yperrno); 147 } 148 149 /* 150 * returns pid, or -1 for failure 151 */ 152 static 153 _openchild(command, fto, ffrom) 154 char *command; 155 FILE **fto; 156 FILE **ffrom; 157 { 158 int i; 159 pid_t pid; 160 int pdto[2]; 161 int pdfrom[2]; 162 char *com; 163 struct rlimit rl; 164 165 if (pipe(pdto) < 0) { 166 goto error1; 167 } 168 if (pipe(pdfrom) < 0) { 169 goto error2; 170 } 171 #ifdef VFORK 172 switch (pid = vfork()) { 173 #else 174 switch (pid = fork()) { 175 #endif 176 case -1: 177 goto error3; 178 179 case 0: 180 /* 181 * child: read from pdto[0], write into pdfrom[1] 182 */ 183 (void)close(0); 184 (void)dup(pdto[0]); 185 (void)close(1); 186 (void)dup(pdfrom[1]); 187 getrlimit(RLIMIT_NOFILE, &rl); 188 for (i = rl.rlim_max - 1; i >= 3; i--) { 189 (void) close(i); 190 } 191 com = malloc((unsigned) strlen(command) + 6); 192 if (com == NULL) { 193 _exit(~0); 194 } 195 (void)sprintf(com, "exec %s", command); 196 execl(SHELL, basename(SHELL), "-c", com, NULL); 197 _exit(~0); 198 199 default: 200 /* 201 * parent: write into pdto[1], read from pdfrom[0] 202 */ 203 *fto = fdopen(pdto[1], "w"); 204 (void)close(pdto[0]); 205 *ffrom = fdopen(pdfrom[0], "r"); 206 (void)close(pdfrom[1]); 207 break; 208 } 209 return (pid); 210 211 /* 212 * error cleanup and return 213 */ 214 error3: 215 (void)close(pdfrom[0]); 216 (void)close(pdfrom[1]); 217 error2: 218 (void)close(pdto[0]); 219 (void)close(pdto[1]); 220 error1: 221 return (-1); 222 } 223 224 static char * 225 basename(path) 226 char *path; 227 { 228 char *p; 229 230 p = strrchr(path, '/'); 231 if (p == NULL) { 232 return (path); 233 } else { 234 return (p + 1); 235 } 236 } 237 238 #else /* YP */ 239 240 #ifdef foo 241 #define ERR_ACCESS 1 242 #define ERR_MALLOC 2 243 #define ERR_READ 3 244 #define ERR_WRITE 4 245 #define ERR_DBASE 5 246 #define ERR_KEY 6 247 extern char *malloc(); 248 #endif 249 250 static int match __P(( char * , char * )); 251 252 /* 253 * Determine if requester is allowed to update the given map, 254 * and update it if so. Returns the status, which is zero 255 * if there is no access violation. This function updates 256 * the local file and then shuts up. 257 */ 258 int 259 localupdate(name, filename, op, keylen, key, datalen, data) 260 char *name; /* Name of the requestor */ 261 char *filename; 262 u_int op; 263 u_int keylen; /* Not used */ 264 char *key; 265 u_int datalen; /* Not used */ 266 char *data; 267 { 268 char line[256]; 269 FILE *rf; 270 FILE *wf; 271 char *tmpname; 272 int err; 273 274 /* 275 * Check permission 276 */ 277 if (strcmp(name, key) != 0) { 278 return (ERR_ACCESS); 279 } 280 if (strcmp(name, "nobody") == 0) { 281 /* 282 * Can't change "nobody"s key. 283 */ 284 return (ERR_ACCESS); 285 } 286 287 /* 288 * Open files 289 */ 290 tmpname = malloc(strlen(filename) + 4); 291 if (tmpname == NULL) { 292 return (ERR_MALLOC); 293 } 294 sprintf(tmpname, "%s.tmp", filename); 295 rf = fopen(filename, "r"); 296 if (rf == NULL) { 297 return (ERR_READ); 298 } 299 wf = fopen(tmpname, "w"); 300 if (wf == NULL) { 301 return (ERR_WRITE); 302 } 303 err = -1; 304 while (fgets(line, sizeof (line), rf)) { 305 if (err < 0 && match(line, name)) { 306 switch (op) { 307 case YPOP_INSERT: 308 err = ERR_KEY; 309 break; 310 case YPOP_STORE: 311 case YPOP_CHANGE: 312 fprintf(wf, "%s %s\n", key, data); 313 err = 0; 314 break; 315 case YPOP_DELETE: 316 /* do nothing */ 317 err = 0; 318 break; 319 } 320 } else { 321 fputs(line, wf); 322 } 323 } 324 if (err < 0) { 325 switch (op) { 326 case YPOP_CHANGE: 327 case YPOP_DELETE: 328 err = ERR_KEY; 329 break; 330 case YPOP_INSERT: 331 case YPOP_STORE: 332 err = 0; 333 fprintf(wf, "%s %s\n", key, data); 334 break; 335 } 336 } 337 fclose(wf); 338 fclose(rf); 339 if (err == 0) { 340 if (rename(tmpname, filename) < 0) { 341 return (ERR_DBASE); 342 } 343 } else { 344 if (unlink(tmpname) < 0) { 345 return (ERR_DBASE); 346 } 347 } 348 return (err); 349 } 350 351 static int 352 match(line, name) 353 char *line; 354 char *name; 355 { 356 int len; 357 358 len = strlen(name); 359 return (strncmp(line, name, len) == 0 && 360 (line[len] == ' ' || line[len] == '\t')); 361 } 362 #endif /* !YP */ 363 364