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.bin/newkey/update.c,v 1.5 1999/08/28 01:04:35 peter Exp $ 32 * $DragonFly: src/usr.bin/newkey/update.c,v 1.4 2005/01/11 00:29:12 joerg 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 <sys/types.h> 43 #include <sys/time.h> 44 #include <sys/resource.h> 45 #include <pwd.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #include <rpc/rpc.h> 52 #include <rpc/key_prot.h> 53 #ifdef YP 54 #include <rpcsvc/yp_prot.h> 55 #include <rpcsvc/ypclnt.h> 56 #include <sys/wait.h> 57 #include <netdb.h> 58 #endif /* YP */ 59 60 #include "externs.h" 61 62 #ifdef YP 63 #define MAXMAPNAMELEN 256 64 #else 65 #define YPOP_CHANGE 1 /* change, do not add */ 66 #define YPOP_INSERT 2 /* add, do not change */ 67 #define YPOP_DELETE 3 /* delete this entry */ 68 #define YPOP_STORE 4 /* add, or change */ 69 #endif 70 71 #ifdef YP 72 static char *basename(char *); 73 static char SHELL[] = "/bin/sh"; 74 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */ 75 static char UPDATEFILE[] = "updaters"; 76 #endif /* YP */ 77 78 #ifdef YP 79 static int _openchild(char *, FILE **, FILE ** ); 80 81 /* 82 * Determine if requester is allowed to update the given map, 83 * and update it if so. Returns the yp status, which is zero 84 * if there is no access violation. 85 */ 86 int 87 mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key, 88 u_int datalen, char *data) 89 { 90 char updater[MAXMAPNAMELEN + 40]; 91 FILE *childargs; 92 FILE *childrslt; 93 #ifdef WEXITSTATUS 94 int status; 95 #else 96 union wait status; 97 #endif 98 pid_t pid; 99 u_int yperrno; 100 101 102 #ifdef DEBUG 103 printf("%s %s\n", key, data); 104 #endif 105 (void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */ 106 UPDATEFILE, mapname); 107 pid = _openchild(updater, &childargs, &childrslt); 108 if (pid < 0) { 109 return (YPERR_YPERR); 110 } 111 112 /* 113 * Write to child 114 */ 115 (void)fprintf(childargs, "%s\n", requester); 116 (void)fprintf(childargs, "%u\n", op); 117 (void)fprintf(childargs, "%u\n", keylen); 118 (void)fwrite(key, (int)keylen, 1, childargs); 119 (void)fprintf(childargs, "\n"); 120 (void)fprintf(childargs, "%u\n", datalen); 121 (void)fwrite(data, (int)datalen, 1, childargs); 122 (void)fprintf(childargs, "\n"); 123 (void)fclose(childargs); 124 125 /* 126 * Read from child 127 */ 128 (void)fscanf(childrslt, "%d", &yperrno); 129 (void)fclose(childrslt); 130 131 (void)wait(&status); 132 #ifdef WEXITSTATUS 133 if (WEXITSTATUS(status) != 0) { 134 #else 135 if (status.w_retcode != 0) { 136 #endif 137 return (YPERR_YPERR); 138 } 139 return (yperrno); 140 } 141 142 /* 143 * returns pid, or -1 for failure 144 */ 145 static int 146 _openchild(char *command, FILE **fto, FILE **ffrom) 147 { 148 int i; 149 pid_t pid; 150 int pdto[2]; 151 int pdfrom[2]; 152 char *com; 153 struct rlimit rl; 154 155 if (pipe(pdto) < 0) { 156 goto error1; 157 } 158 if (pipe(pdfrom) < 0) { 159 goto error2; 160 } 161 switch (pid = fork()) { 162 case -1: 163 goto error3; 164 165 case 0: 166 /* 167 * child: read from pdto[0], write into pdfrom[1] 168 */ 169 (void)close(0); 170 (void)dup(pdto[0]); 171 (void)close(1); 172 (void)dup(pdfrom[1]); 173 getrlimit(RLIMIT_NOFILE, &rl); 174 for (i = rl.rlim_max - 1; i >= 3; i--) { 175 (void) close(i); 176 } 177 com = malloc((unsigned) strlen(command) + 6); 178 if (com == NULL) { 179 _exit(~0); 180 } 181 (void)sprintf(com, "exec %s", command); 182 execl(SHELL, basename(SHELL), "-c", com, NULL); 183 _exit(~0); 184 185 default: 186 /* 187 * parent: write into pdto[1], read from pdfrom[0] 188 */ 189 *fto = fdopen(pdto[1], "w"); 190 (void)close(pdto[0]); 191 *ffrom = fdopen(pdfrom[0], "r"); 192 (void)close(pdfrom[1]); 193 break; 194 } 195 return (pid); 196 197 /* 198 * error cleanup and return 199 */ 200 error3: 201 (void)close(pdfrom[0]); 202 (void)close(pdfrom[1]); 203 error2: 204 (void)close(pdto[0]); 205 (void)close(pdto[1]); 206 error1: 207 return (-1); 208 } 209 210 static char * 211 basename(char *path) 212 { 213 char *p; 214 215 p = strrchr(path, '/'); 216 if (p == NULL) { 217 return (path); 218 } else { 219 return (p + 1); 220 } 221 } 222 223 #else /* YP */ 224 225 #define ERR_ACCESS 1 226 #define ERR_MALLOC 2 227 #define ERR_READ 3 228 #define ERR_WRITE 4 229 #define ERR_DBASE 5 230 #define ERR_KEY 6 231 232 static int match( char * , char * ); 233 234 /* 235 * Determine if requester is allowed to update the given map, 236 * and update it if so. Returns the status, which is zero 237 * if there is no access violation. This function updates 238 * the local file and then shuts up. 239 */ 240 int 241 localupdate(char *name, char *filename, u_int op, char *key, char *data) 242 { 243 char line[256]; 244 FILE *rf; 245 FILE *wf; 246 char *tmpname; 247 int err; 248 249 /* 250 * Check permission 251 */ 252 if (strcmp(name, key) != 0) { 253 return (ERR_ACCESS); 254 } 255 if (strcmp(name, "nobody") == 0) { 256 /* 257 * Can't change "nobody"s key. 258 */ 259 return (ERR_ACCESS); 260 } 261 262 /* 263 * Open files 264 */ 265 tmpname = malloc(strlen(filename) + 4); 266 if (tmpname == NULL) { 267 return (ERR_MALLOC); 268 } 269 sprintf(tmpname, "%s.tmp", filename); 270 rf = fopen(filename, "r"); 271 if (rf == NULL) { 272 return (ERR_READ); 273 } 274 wf = fopen(tmpname, "w"); 275 if (wf == NULL) { 276 return (ERR_WRITE); 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 return (ERR_DBASE); 317 } 318 } else { 319 if (unlink(tmpname) < 0) { 320 return (ERR_DBASE); 321 } 322 } 323 return (err); 324 } 325 326 static int 327 match(char *line, char *name) 328 { 329 int len; 330 331 len = strlen(name); 332 return (strncmp(line, name, len) == 0 && 333 (line[len] == ' ' || line[len] == '\t')); 334 } 335 #endif /* !YP */ 336 337