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