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 static const char rcsid[] = 36 "$FreeBSD$"; 37 #endif /* not lint */ 38 39 /* 40 * Copyright (C) 1986, 1989, Sun Microsystems, Inc. 41 */ 42 43 /* 44 * Administrative tool to add a new user to the publickey database 45 */ 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 #include <rpc/rpc.h> 50 #include <rpc/key_prot.h> 51 #ifdef YP 52 #include <rpcsvc/yp_prot.h> 53 #include <rpcsvc/ypclnt.h> 54 #include <sys/wait.h> 55 #include <netdb.h> 56 #endif /* YP */ 57 #include <pwd.h> 58 #include <string.h> 59 #include <sys/resource.h> 60 #include "ypupdated_extern.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 SHELL[] = "/bin/sh"; 73 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */ 74 static char PKMAP[] = "publickey.byname"; 75 static char UPDATEFILE[] = "updaters"; 76 static char PKFILE[] = "/etc/publickey"; 77 #endif /* YP */ 78 79 #ifdef YP 80 static int _openchild(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 int 88 mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key, 89 u_int datalen, char *data) 90 { 91 char updater[MAXMAPNAMELEN + 40]; 92 FILE *childargs; 93 FILE *childrslt; 94 #ifdef WEXITSTATUS 95 int status; 96 #else 97 union wait status; 98 #endif 99 pid_t pid; 100 u_int yperrno; 101 102 103 #ifdef DEBUG 104 printf("%s %s\n", key, data); 105 #endif 106 (void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */ 107 UPDATEFILE, mapname); 108 pid = _openchild(updater, &childargs, &childrslt); 109 if (pid < 0) { 110 return (YPERR_YPERR); 111 } 112 113 /* 114 * Write to child 115 */ 116 (void)fprintf(childargs, "%s\n", requester); 117 (void)fprintf(childargs, "%u\n", op); 118 (void)fprintf(childargs, "%u\n", keylen); 119 (void)fwrite(key, (int)keylen, 1, childargs); 120 (void)fprintf(childargs, "\n"); 121 (void)fprintf(childargs, "%u\n", datalen); 122 (void)fwrite(data, (int)datalen, 1, childargs); 123 (void)fprintf(childargs, "\n"); 124 (void)fclose(childargs); 125 126 /* 127 * Read from child 128 */ 129 (void)fscanf(childrslt, "%d", &yperrno); 130 (void)fclose(childrslt); 131 132 (void)wait(&status); 133 #ifdef WEXITSTATUS 134 if (WEXITSTATUS(status) != 0) 135 #else 136 if (status.w_retcode != 0) 137 #endif 138 return (YPERR_YPERR); 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, (char *)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 static int match(char *, char *); 226 227 /* 228 * Determine if requester is allowed to update the given map, 229 * and update it if so. Returns the status, which is zero 230 * if there is no access violation. This function updates 231 * the local file and then shuts up. 232 */ 233 int 234 localupdate(char *name, char *filename, u_int op, u_int keylen __unused, 235 char *key, u_int datalen __unused, char *data) 236 { 237 char line[256]; 238 FILE *rf; 239 FILE *wf; 240 char *tmpname; 241 int err; 242 243 /* 244 * Check permission 245 */ 246 if (strcmp(name, key) != 0) { 247 return (ERR_ACCESS); 248 } 249 if (strcmp(name, "nobody") == 0) { 250 /* 251 * Can't change "nobody"s key. 252 */ 253 return (ERR_ACCESS); 254 } 255 256 /* 257 * Open files 258 */ 259 tmpname = malloc(strlen(filename) + 4); 260 if (tmpname == NULL) { 261 return (ERR_MALLOC); 262 } 263 sprintf(tmpname, "%s.tmp", filename); 264 rf = fopen(filename, "r"); 265 if (rf == NULL) { 266 return (ERR_READ); 267 } 268 wf = fopen(tmpname, "w"); 269 if (wf == NULL) { 270 return (ERR_WRITE); 271 } 272 err = -1; 273 while (fgets(line, sizeof (line), rf)) { 274 if (err < 0 && match(line, name)) { 275 switch (op) { 276 case YPOP_INSERT: 277 err = ERR_KEY; 278 break; 279 case YPOP_STORE: 280 case YPOP_CHANGE: 281 fprintf(wf, "%s %s\n", key, data); 282 err = 0; 283 break; 284 case YPOP_DELETE: 285 /* do nothing */ 286 err = 0; 287 break; 288 } 289 } else { 290 fputs(line, wf); 291 } 292 } 293 if (err < 0) { 294 switch (op) { 295 case YPOP_CHANGE: 296 case YPOP_DELETE: 297 err = ERR_KEY; 298 break; 299 case YPOP_INSERT: 300 case YPOP_STORE: 301 err = 0; 302 fprintf(wf, "%s %s\n", key, data); 303 break; 304 } 305 } 306 fclose(wf); 307 fclose(rf); 308 if (err == 0) { 309 if (rename(tmpname, filename) < 0) { 310 return (ERR_DBASE); 311 } 312 } else { 313 if (unlink(tmpname) < 0) { 314 return (ERR_DBASE); 315 } 316 } 317 return (err); 318 } 319 320 static int 321 match(char *line, char *name) 322 { 323 int len; 324 325 len = strlen(name); 326 return (strncmp(line, name, len) == 0 && 327 (line[len] == ' ' || line[len] == '\t')); 328 } 329 #endif /* !YP */ 330