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.sbin/rpc.ypupdated/update.c,v 1.8 2007/02/15 02:45:14 trhodes 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 <stdio.h> 42 #include <stdlib.h> 43 #include <unistd.h> 44 #include <rpc/rpc.h> 45 #include <rpc/key_prot.h> 46 #ifdef YP 47 #include <rpcsvc/yp_prot.h> 48 #include <rpcsvc/ypclnt.h> 49 #include <sys/wait.h> 50 #include <netdb.h> 51 #endif /* YP */ 52 #include <pwd.h> 53 #include <string.h> 54 #include <sys/resource.h> 55 #include "ypupdated_extern.h" 56 57 #ifdef YP 58 #define MAXMAPNAMELEN 256 59 #else 60 #define YPOP_CHANGE 1 /* change, do not add */ 61 #define YPOP_INSERT 2 /* add, do not change */ 62 #define YPOP_DELETE 3 /* delete this entry */ 63 #define YPOP_STORE 4 /* add, or change */ 64 #endif 65 66 #ifdef YP 67 static char SHELL[] = "/bin/sh"; 68 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */ 69 static char PKMAP[] = "publickey.byname"; 70 static char UPDATEFILE[] = "updaters"; 71 static char PKFILE[] = "/etc/publickey"; 72 #endif /* YP */ 73 74 #ifdef YP 75 static int _openchild(char *, FILE **, FILE **); 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, char *key, 84 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 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 fprintf(childargs, "%s\n", requester); 112 fprintf(childargs, "%u\n", op); 113 fprintf(childargs, "%u\n", keylen); 114 fwrite(key, (int)keylen, 1, childargs); 115 fprintf(childargs, "\n"); 116 fprintf(childargs, "%u\n", datalen); 117 fwrite(data, (int)datalen, 1, childargs); 118 fprintf(childargs, "\n"); 119 fclose(childargs); 120 121 /* 122 * Read from child 123 */ 124 fscanf(childrslt, "%d", &yperrno); 125 fclose(childrslt); 126 127 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 return (yperrno); 135 } 136 137 /* 138 * returns pid, or -1 for failure 139 */ 140 static int 141 _openchild(char *command, FILE **fto, FILE **ffrom) 142 { 143 int i; 144 pid_t pid; 145 int pdto[2]; 146 int pdfrom[2]; 147 char *com; 148 struct rlimit rl; 149 150 if (pipe(pdto) < 0) { 151 goto error1; 152 } 153 if (pipe(pdfrom) < 0) { 154 goto error2; 155 } 156 switch (pid = fork()) { 157 case -1: 158 goto error3; 159 160 case 0: 161 /* 162 * child: read from pdto[0], write into pdfrom[1] 163 */ 164 close(0); 165 dup(pdto[0]); 166 close(1); 167 dup(pdfrom[1]); 168 getrlimit(RLIMIT_NOFILE, &rl); 169 for (i = rl.rlim_max - 1; i >= 3; i--) { 170 close(i); 171 } 172 com = malloc((unsigned) strlen(command) + 6); 173 if (com == NULL) { 174 _exit(~0); 175 } 176 sprintf(com, "exec %s", command); 177 execl(SHELL, basename(SHELL), "-c", com, NULL); 178 _exit(~0); 179 180 default: 181 /* 182 * parent: write into pdto[1], read from pdfrom[0] 183 */ 184 *fto = fdopen(pdto[1], "w"); 185 close(pdto[0]); 186 *ffrom = fdopen(pdfrom[0], "r"); 187 close(pdfrom[1]); 188 break; 189 } 190 return (pid); 191 192 /* 193 * error cleanup and return 194 */ 195 error3: 196 close(pdfrom[0]); 197 close(pdfrom[1]); 198 error2: 199 close(pdto[0]); 200 close(pdto[1]); 201 error1: 202 return (-1); 203 } 204 205 static char * 206 basename(char *path) 207 { 208 char *p; 209 210 p = strrchr(path, '/'); 211 if (p == NULL) { 212 return (path); 213 } else { 214 return (p + 1); 215 } 216 } 217 218 #else /* YP */ 219 220 static int match(char *, char *); 221 222 /* 223 * Determine if requester is allowed to update the given map, 224 * and update it if so. Returns the status, which is zero 225 * if there is no access violation. This function updates 226 * the local file and then shuts up. 227 */ 228 int 229 localupdate(char *name, char *filename, u_int op, u_int keylen __unused, 230 char *key, u_int datalen __unused, char *data) 231 { 232 char line[256]; 233 FILE *rf; 234 FILE *wf; 235 char *tmpname; 236 int err; 237 238 /* 239 * Check permission 240 */ 241 if (strcmp(name, key) != 0) { 242 return (ERR_ACCESS); 243 } 244 if (strcmp(name, "nobody") == 0) { 245 /* 246 * Can't change "nobody"s key. 247 */ 248 return (ERR_ACCESS); 249 } 250 251 /* 252 * Open files 253 */ 254 tmpname = malloc(strlen(filename) + 4); 255 if (tmpname == NULL) { 256 return (ERR_MALLOC); 257 } 258 sprintf(tmpname, "%s.tmp", filename); 259 rf = fopen(filename, "r"); 260 if (rf == NULL) { 261 return (ERR_READ); 262 } 263 wf = fopen(tmpname, "w"); 264 if (wf == NULL) { 265 return (ERR_WRITE); 266 } 267 err = -1; 268 while (fgets(line, sizeof (line), rf)) { 269 if (err < 0 && match(line, name)) { 270 switch (op) { 271 case YPOP_INSERT: 272 err = ERR_KEY; 273 break; 274 case YPOP_STORE: 275 case YPOP_CHANGE: 276 fprintf(wf, "%s %s\n", key, data); 277 err = 0; 278 break; 279 case YPOP_DELETE: 280 /* do nothing */ 281 err = 0; 282 break; 283 } 284 } else { 285 fputs(line, wf); 286 } 287 } 288 if (err < 0) { 289 switch (op) { 290 case YPOP_CHANGE: 291 case YPOP_DELETE: 292 err = ERR_KEY; 293 break; 294 case YPOP_INSERT: 295 case YPOP_STORE: 296 err = 0; 297 fprintf(wf, "%s %s\n", key, data); 298 break; 299 } 300 } 301 fclose(wf); 302 fclose(rf); 303 if (err == 0) { 304 if (rename(tmpname, filename) < 0) { 305 return (ERR_DBASE); 306 } 307 } else { 308 if (unlink(tmpname) < 0) { 309 return (ERR_DBASE); 310 } 311 } 312 return (err); 313 } 314 315 static int 316 match(char *line, char *name) 317 { 318 int len; 319 320 len = strlen(name); 321 return (strncmp(line, name, len) == 0 && 322 (line[len] == ' ' || line[len] == '\t')); 323 } 324 #endif /* !YP */ 325