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