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 #ifndef lint 31 #if 0 32 static char sccsid[] = "@(#)update.c 1.2 91/03/11 Copyr 1986 Sun Micro"; 33 #endif 34 static const char rcsid[] = 35 "$FreeBSD: src/usr.bin/newkey/update.c,v 1.5 1999/08/28 01:04:35 peter Exp $"; 36 #endif 37 38 /* 39 * Copyright (C) 1986, 1989, Sun Microsystems, Inc. 40 */ 41 42 /* 43 * Administrative tool to add a new user to the publickey database 44 */ 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <rpc/rpc.h> 48 #include <rpc/key_prot.h> 49 #ifdef YP 50 #include <rpcsvc/yp_prot.h> 51 #include <rpcsvc/ypclnt.h> 52 #include <sys/wait.h> 53 #include <netdb.h> 54 #endif /* YP */ 55 #include <pwd.h> 56 #include <string.h> 57 #include <unistd.h> 58 #include <sys/resource.h> 59 60 #ifdef YP 61 #define MAXMAPNAMELEN 256 62 #else 63 #define YPOP_CHANGE 1 /* change, do not add */ 64 #define YPOP_INSERT 2 /* add, do not change */ 65 #define YPOP_DELETE 3 /* delete this entry */ 66 #define YPOP_STORE 4 /* add, or change */ 67 #endif 68 69 #ifdef YP 70 static char *basename(); 71 static char SHELL[] = "/bin/sh"; 72 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */ 73 static char PKMAP[] = "publickey.byname"; 74 static char UPDATEFILE[] = "updaters"; 75 #else 76 static char PKFILE[] = "/etc/publickey"; 77 #endif /* YP */ 78 79 #ifdef YP 80 static int _openchild __P(( char *, FILE **, FILE ** )); 81 82 /* 83 * Determine if requester is allowed to update the given map, 84 * and update it if so. Returns the yp status, which is zero 85 * if there is no access violation. 86 */ 87 mapupdate(requester, mapname, op, keylen, key, datalen, data) 88 char *requester; 89 char *mapname; 90 u_int op; 91 u_int keylen; 92 char *key; 93 u_int datalen; 94 char *data; 95 { 96 char updater[MAXMAPNAMELEN + 40]; 97 FILE *childargs; 98 FILE *childrslt; 99 #ifdef WEXITSTATUS 100 int status; 101 #else 102 union wait status; 103 #endif 104 pid_t pid; 105 u_int yperrno; 106 107 108 #ifdef DEBUG 109 printf("%s %s\n", key, data); 110 #endif 111 (void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */ 112 UPDATEFILE, mapname); 113 pid = _openchild(updater, &childargs, &childrslt); 114 if (pid < 0) { 115 return (YPERR_YPERR); 116 } 117 118 /* 119 * Write to child 120 */ 121 (void)fprintf(childargs, "%s\n", requester); 122 (void)fprintf(childargs, "%u\n", op); 123 (void)fprintf(childargs, "%u\n", keylen); 124 (void)fwrite(key, (int)keylen, 1, childargs); 125 (void)fprintf(childargs, "\n"); 126 (void)fprintf(childargs, "%u\n", datalen); 127 (void)fwrite(data, (int)datalen, 1, childargs); 128 (void)fprintf(childargs, "\n"); 129 (void)fclose(childargs); 130 131 /* 132 * Read from child 133 */ 134 (void)fscanf(childrslt, "%d", &yperrno); 135 (void)fclose(childrslt); 136 137 (void)wait(&status); 138 #ifdef WEXITSTATUS 139 if (WEXITSTATUS(status) != 0) { 140 #else 141 if (status.w_retcode != 0) { 142 #endif 143 return (YPERR_YPERR); 144 } 145 return (yperrno); 146 } 147 148 /* 149 * returns pid, or -1 for failure 150 */ 151 static 152 _openchild(command, fto, ffrom) 153 char *command; 154 FILE **fto; 155 FILE **ffrom; 156 { 157 int i; 158 pid_t pid; 159 int pdto[2]; 160 int pdfrom[2]; 161 char *com; 162 struct rlimit rl; 163 164 if (pipe(pdto) < 0) { 165 goto error1; 166 } 167 if (pipe(pdfrom) < 0) { 168 goto error2; 169 } 170 switch (pid = fork()) { 171 case -1: 172 goto error3; 173 174 case 0: 175 /* 176 * child: read from pdto[0], write into pdfrom[1] 177 */ 178 (void)close(0); 179 (void)dup(pdto[0]); 180 (void)close(1); 181 (void)dup(pdfrom[1]); 182 getrlimit(RLIMIT_NOFILE, &rl); 183 for (i = rl.rlim_max - 1; i >= 3; i--) { 184 (void) close(i); 185 } 186 com = malloc((unsigned) strlen(command) + 6); 187 if (com == NULL) { 188 _exit(~0); 189 } 190 (void)sprintf(com, "exec %s", command); 191 execl(SHELL, basename(SHELL), "-c", com, NULL); 192 _exit(~0); 193 194 default: 195 /* 196 * parent: write into pdto[1], read from pdfrom[0] 197 */ 198 *fto = fdopen(pdto[1], "w"); 199 (void)close(pdto[0]); 200 *ffrom = fdopen(pdfrom[0], "r"); 201 (void)close(pdfrom[1]); 202 break; 203 } 204 return (pid); 205 206 /* 207 * error cleanup and return 208 */ 209 error3: 210 (void)close(pdfrom[0]); 211 (void)close(pdfrom[1]); 212 error2: 213 (void)close(pdto[0]); 214 (void)close(pdto[1]); 215 error1: 216 return (-1); 217 } 218 219 static char * 220 basename(path) 221 char *path; 222 { 223 char *p; 224 225 p = strrchr(path, '/'); 226 if (p == NULL) { 227 return (path); 228 } else { 229 return (p + 1); 230 } 231 } 232 233 #else /* YP */ 234 235 #define ERR_ACCESS 1 236 #define ERR_MALLOC 2 237 #define ERR_READ 3 238 #define ERR_WRITE 4 239 #define ERR_DBASE 5 240 #define ERR_KEY 6 241 242 static int match __P(( char * , char * )); 243 244 /* 245 * Determine if requester is allowed to update the given map, 246 * and update it if so. Returns the status, which is zero 247 * if there is no access violation. This function updates 248 * the local file and then shuts up. 249 */ 250 localupdate(name, filename, op, keylen, key, datalen, data) 251 char *name; /* Name of the requestor */ 252 char *filename; 253 u_int op; 254 u_int keylen; /* Not used */ 255 char *key; 256 u_int datalen; /* Not used */ 257 char *data; 258 { 259 char line[256]; 260 FILE *rf; 261 FILE *wf; 262 char *tmpname; 263 int err; 264 265 /* 266 * Check permission 267 */ 268 if (strcmp(name, key) != 0) { 269 return (ERR_ACCESS); 270 } 271 if (strcmp(name, "nobody") == 0) { 272 /* 273 * Can't change "nobody"s key. 274 */ 275 return (ERR_ACCESS); 276 } 277 278 /* 279 * Open files 280 */ 281 tmpname = malloc(strlen(filename) + 4); 282 if (tmpname == NULL) { 283 return (ERR_MALLOC); 284 } 285 sprintf(tmpname, "%s.tmp", filename); 286 rf = fopen(filename, "r"); 287 if (rf == NULL) { 288 return (ERR_READ); 289 } 290 wf = fopen(tmpname, "w"); 291 if (wf == NULL) { 292 return (ERR_WRITE); 293 } 294 err = -1; 295 while (fgets(line, sizeof (line), rf)) { 296 if (err < 0 && match(line, name)) { 297 switch (op) { 298 case YPOP_INSERT: 299 err = ERR_KEY; 300 break; 301 case YPOP_STORE: 302 case YPOP_CHANGE: 303 fprintf(wf, "%s %s\n", key, data); 304 err = 0; 305 break; 306 case YPOP_DELETE: 307 /* do nothing */ 308 err = 0; 309 break; 310 } 311 } else { 312 fputs(line, wf); 313 } 314 } 315 if (err < 0) { 316 switch (op) { 317 case YPOP_CHANGE: 318 case YPOP_DELETE: 319 err = ERR_KEY; 320 break; 321 case YPOP_INSERT: 322 case YPOP_STORE: 323 err = 0; 324 fprintf(wf, "%s %s\n", key, data); 325 break; 326 } 327 } 328 fclose(wf); 329 fclose(rf); 330 if (err == 0) { 331 if (rename(tmpname, filename) < 0) { 332 return (ERR_DBASE); 333 } 334 } else { 335 if (unlink(tmpname) < 0) { 336 return (ERR_DBASE); 337 } 338 } 339 return (err); 340 } 341 342 static 343 match(line, name) 344 char *line; 345 char *name; 346 { 347 int len; 348 349 len = strlen(name); 350 return (strncmp(line, name, len) == 0 && 351 (line[len] == ' ' || line[len] == '\t')); 352 } 353 #endif /* !YP */ 354 355