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, MERCHANTABILITY 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.bin/newkey/update.c,v 1.5 1999/08/28 01:04:35 peter Exp $ 32 */ 33 34 /* 35 * Copyright (C) 1986, 1989, Sun Microsystems, Inc. 36 */ 37 38 /* 39 * Administrative tool to add a new user to the publickey database 40 */ 41 #include <sys/types.h> 42 #include <sys/time.h> 43 #include <sys/resource.h> 44 #include <pwd.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include <rpc/rpc.h> 51 #include <rpc/key_prot.h> 52 #ifdef YP 53 #include <rpcsvc/yp_prot.h> 54 #include <rpcsvc/ypclnt.h> 55 #include <sys/wait.h> 56 #include <netdb.h> 57 #endif /* YP */ 58 59 #include "externs.h" 60 61 #ifdef YP 62 #define MAXMAPNAMELEN 256 63 #else 64 #define YPOP_CHANGE 1 /* change, do not add */ 65 #define YPOP_INSERT 2 /* add, do not change */ 66 #define YPOP_DELETE 3 /* delete this entry */ 67 #define YPOP_STORE 4 /* add, or change */ 68 #endif 69 70 #ifdef YP 71 static char *basename(char *); 72 static char SHELL[] = "/bin/sh"; 73 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */ 74 static char UPDATEFILE[] = "updaters"; 75 #endif /* YP */ 76 77 #ifdef YP 78 static int _openchild(char *, FILE **, FILE ** ); 79 80 /* 81 * Determine if requester is allowed to update the given map, 82 * and update it if so. Returns the yp status, which is zero 83 * if there is no access violation. 84 */ 85 int 86 mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key, 87 u_int datalen, char *data) 88 { 89 char updater[MAXMAPNAMELEN + 40]; 90 FILE *childargs; 91 FILE *childrslt; 92 #ifdef WEXITSTATUS 93 int status; 94 #else 95 union wait status; 96 #endif 97 pid_t pid; 98 u_int yperrno; 99 100 101 #ifdef DEBUG 102 printf("%s %s\n", key, data); 103 #endif 104 (void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */ 105 UPDATEFILE, mapname); 106 pid = _openchild(updater, &childargs, &childrslt); 107 if (pid < 0) { 108 return (YPERR_YPERR); 109 } 110 111 /* 112 * Write to child 113 */ 114 (void)fprintf(childargs, "%s\n", requester); 115 (void)fprintf(childargs, "%u\n", op); 116 (void)fprintf(childargs, "%u\n", keylen); 117 (void)fwrite(key, (int)keylen, 1, childargs); 118 (void)fprintf(childargs, "\n"); 119 (void)fprintf(childargs, "%u\n", datalen); 120 (void)fwrite(data, (int)datalen, 1, childargs); 121 (void)fprintf(childargs, "\n"); 122 (void)fclose(childargs); 123 124 /* 125 * Read from child 126 */ 127 (void)fscanf(childrslt, "%d", &yperrno); 128 (void)fclose(childrslt); 129 130 (void)wait(&status); 131 #ifdef WEXITSTATUS 132 if (WEXITSTATUS(status) != 0) { 133 #else 134 if (status.w_retcode != 0) { 135 #endif 136 return (YPERR_YPERR); 137 } 138 return (yperrno); 139 } 140 141 /* 142 * returns pid, or -1 for failure 143 */ 144 static int 145 _openchild(char *command, FILE **fto, FILE **ffrom) 146 { 147 int i; 148 pid_t pid; 149 int pdto[2]; 150 int pdfrom[2]; 151 char *com; 152 struct rlimit rl; 153 154 if (pipe(pdto) < 0) { 155 goto error1; 156 } 157 if (pipe(pdfrom) < 0) { 158 goto error2; 159 } 160 switch (pid = fork()) { 161 case -1: 162 goto error3; 163 164 case 0: 165 /* 166 * child: read from pdto[0], write into pdfrom[1] 167 */ 168 (void)close(0); 169 (void)dup(pdto[0]); 170 (void)close(1); 171 (void)dup(pdfrom[1]); 172 getrlimit(RLIMIT_NOFILE, &rl); 173 for (i = rl.rlim_max - 1; i >= 3; i--) { 174 (void) close(i); 175 } 176 com = malloc((unsigned) strlen(command) + 6); 177 if (com == NULL) { 178 _exit(~0); 179 } 180 (void)sprintf(com, "exec %s", command); 181 execl(SHELL, basename(SHELL), "-c", com, NULL); 182 _exit(~0); 183 184 default: 185 /* 186 * parent: write into pdto[1], read from pdfrom[0] 187 */ 188 *fto = fdopen(pdto[1], "w"); 189 (void)close(pdto[0]); 190 *ffrom = fdopen(pdfrom[0], "r"); 191 (void)close(pdfrom[1]); 192 break; 193 } 194 return (pid); 195 196 /* 197 * error cleanup and return 198 */ 199 error3: 200 (void)close(pdfrom[0]); 201 (void)close(pdfrom[1]); 202 error2: 203 (void)close(pdto[0]); 204 (void)close(pdto[1]); 205 error1: 206 return (-1); 207 } 208 209 static char * 210 basename(char *path) 211 { 212 char *p; 213 214 p = strrchr(path, '/'); 215 if (p == NULL) { 216 return (path); 217 } else { 218 return (p + 1); 219 } 220 } 221 222 #else /* YP */ 223 224 #define ERR_ACCESS 1 225 #define ERR_MALLOC 2 226 #define ERR_READ 3 227 #define ERR_WRITE 4 228 #define ERR_DBASE 5 229 #define ERR_KEY 6 230 231 static int match( char * , char * ); 232 233 /* 234 * Determine if requester is allowed to update the given map, 235 * and update it if so. Returns the status, which is zero 236 * if there is no access violation. This function updates 237 * the local file and then shuts up. 238 */ 239 int 240 localupdate(char *name, char *filename, u_int op, char *key, char *data) 241 { 242 char line[256]; 243 FILE *rf; 244 FILE *wf; 245 char *tmpname; 246 int err; 247 248 /* 249 * Check permission 250 */ 251 if (strcmp(name, key) != 0) { 252 return (ERR_ACCESS); 253 } 254 if (strcmp(name, "nobody") == 0) { 255 /* 256 * Can't change "nobody"s key. 257 */ 258 return (ERR_ACCESS); 259 } 260 261 /* 262 * Open files 263 */ 264 tmpname = malloc(strlen(filename) + 4); 265 if (tmpname == NULL) { 266 return (ERR_MALLOC); 267 } 268 sprintf(tmpname, "%s.tmp", filename); 269 rf = fopen(filename, "r"); 270 if (rf == NULL) { 271 return (ERR_READ); 272 } 273 wf = fopen(tmpname, "w"); 274 if (wf == NULL) { 275 return (ERR_WRITE); 276 } 277 err = -1; 278 while (fgets(line, sizeof (line), rf)) { 279 if (err < 0 && match(line, name)) { 280 switch (op) { 281 case YPOP_INSERT: 282 err = ERR_KEY; 283 break; 284 case YPOP_STORE: 285 case YPOP_CHANGE: 286 fprintf(wf, "%s %s\n", key, data); 287 err = 0; 288 break; 289 case YPOP_DELETE: 290 /* do nothing */ 291 err = 0; 292 break; 293 } 294 } else { 295 fputs(line, wf); 296 } 297 } 298 if (err < 0) { 299 switch (op) { 300 case YPOP_CHANGE: 301 case YPOP_DELETE: 302 err = ERR_KEY; 303 break; 304 case YPOP_INSERT: 305 case YPOP_STORE: 306 err = 0; 307 fprintf(wf, "%s %s\n", key, data); 308 break; 309 } 310 } 311 fclose(wf); 312 fclose(rf); 313 if (err == 0) { 314 if (rename(tmpname, filename) < 0) { 315 return (ERR_DBASE); 316 } 317 } else { 318 if (unlink(tmpname) < 0) { 319 return (ERR_DBASE); 320 } 321 } 322 return (err); 323 } 324 325 static int 326 match(char *line, char *name) 327 { 328 int len; 329 330 len = strlen(name); 331 return (strncmp(line, name, len) == 0 && 332 (line[len] == ' ' || line[len] == '\t')); 333 } 334 #endif /* !YP */ 335 336