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 /* 32 * Copyright (C) 1986, 1989, Sun Microsystems, Inc. 33 */ 34 35 /* 36 * Administrative tool to add a new user to the publickey database 37 */ 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <unistd.h> 41 #include <rpc/rpc.h> 42 #include <rpc/key_prot.h> 43 #ifdef YP 44 #include <rpcsvc/yp_prot.h> 45 #include <rpcsvc/ypclnt.h> 46 #include <sys/wait.h> 47 #include <netdb.h> 48 #endif /* YP */ 49 #include <pwd.h> 50 #include <string.h> 51 #include <sys/resource.h> 52 #include "ypupdated_extern.h" 53 54 #ifdef YP 55 #define MAXMAPNAMELEN 256 56 #else 57 #define YPOP_CHANGE 1 /* change, do not add */ 58 #define YPOP_INSERT 2 /* add, do not change */ 59 #define YPOP_DELETE 3 /* delete this entry */ 60 #define YPOP_STORE 4 /* add, or change */ 61 #endif 62 63 #ifdef YP 64 static char SHELL[] = "/bin/sh"; 65 static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */ 66 static char PKMAP[] = "publickey.byname"; 67 static char UPDATEFILE[] = "updaters"; 68 static char PKFILE[] = "/etc/publickey"; 69 #endif /* YP */ 70 71 #ifdef YP 72 static int _openchild(char *, FILE **, FILE **); 73 74 /* 75 * Determine if requester is allowed to update the given map, 76 * and update it if so. Returns the yp status, which is zero 77 * if there is no access violation. 78 */ 79 int 80 mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key, 81 u_int datalen, char *data) 82 { 83 char updater[MAXMAPNAMELEN + 40]; 84 FILE *childargs; 85 FILE *childrslt; 86 #ifdef WEXITSTATUS 87 int status; 88 #else 89 union wait status; 90 #endif 91 pid_t pid; 92 u_int yperrno; 93 94 95 #ifdef DEBUG 96 printf("%s %s\n", key, data); 97 #endif 98 (void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */ 99 UPDATEFILE, mapname); 100 pid = _openchild(updater, &childargs, &childrslt); 101 if (pid < 0) { 102 return (YPERR_YPERR); 103 } 104 105 /* 106 * Write to child 107 */ 108 (void)fprintf(childargs, "%s\n", requester); 109 (void)fprintf(childargs, "%u\n", op); 110 (void)fprintf(childargs, "%u\n", keylen); 111 (void)fwrite(key, (int)keylen, 1, childargs); 112 (void)fprintf(childargs, "\n"); 113 (void)fprintf(childargs, "%u\n", datalen); 114 (void)fwrite(data, (int)datalen, 1, childargs); 115 (void)fprintf(childargs, "\n"); 116 (void)fclose(childargs); 117 118 /* 119 * Read from child 120 */ 121 (void)fscanf(childrslt, "%d", &yperrno); 122 (void)fclose(childrslt); 123 124 (void)wait(&status); 125 #ifdef WEXITSTATUS 126 if (WEXITSTATUS(status) != 0) 127 #else 128 if (status.w_retcode != 0) 129 #endif 130 return (YPERR_YPERR); 131 return (yperrno); 132 } 133 134 /* 135 * returns pid, or -1 for failure 136 */ 137 static int 138 _openchild(char *command, FILE **fto, FILE **ffrom) 139 { 140 int i; 141 pid_t pid; 142 int pdto[2]; 143 int pdfrom[2]; 144 char *com; 145 struct rlimit rl; 146 147 if (pipe(pdto) < 0) { 148 goto error1; 149 } 150 if (pipe(pdfrom) < 0) { 151 goto error2; 152 } 153 switch (pid = fork()) { 154 case -1: 155 goto error3; 156 157 case 0: 158 /* 159 * child: read from pdto[0], write into pdfrom[1] 160 */ 161 (void)close(0); 162 (void)dup(pdto[0]); 163 (void)close(1); 164 (void)dup(pdfrom[1]); 165 getrlimit(RLIMIT_NOFILE, &rl); 166 for (i = rl.rlim_max - 1; i >= 3; i--) { 167 (void) close(i); 168 } 169 com = malloc((unsigned) strlen(command) + 6); 170 if (com == NULL) { 171 _exit(~0); 172 } 173 (void)sprintf(com, "exec %s", command); 174 execl(SHELL, basename(SHELL), "-c", com, (char *)NULL); 175 _exit(~0); 176 177 default: 178 /* 179 * parent: write into pdto[1], read from pdfrom[0] 180 */ 181 *fto = fdopen(pdto[1], "w"); 182 (void)close(pdto[0]); 183 *ffrom = fdopen(pdfrom[0], "r"); 184 (void)close(pdfrom[1]); 185 break; 186 } 187 return (pid); 188 189 /* 190 * error cleanup and return 191 */ 192 error3: 193 (void)close(pdfrom[0]); 194 (void)close(pdfrom[1]); 195 error2: 196 (void)close(pdto[0]); 197 (void)close(pdto[1]); 198 error1: 199 return (-1); 200 } 201 202 static char * 203 basename(char *path) 204 { 205 char *p; 206 207 p = strrchr(path, '/'); 208 if (p == NULL) { 209 return (path); 210 } else { 211 return (p + 1); 212 } 213 } 214 215 #else /* YP */ 216 217 static int match(char *, char *); 218 219 /* 220 * Determine if requester is allowed to update the given map, 221 * and update it if so. Returns the status, which is zero 222 * if there is no access violation. This function updates 223 * the local file and then shuts up. 224 */ 225 int 226 localupdate(char *name, char *filename, u_int op, u_int keylen __unused, 227 char *key, u_int datalen __unused, char *data) 228 { 229 char line[256]; 230 FILE *rf; 231 FILE *wf; 232 char *tmpname; 233 int err; 234 235 /* 236 * Check permission 237 */ 238 if (strcmp(name, key) != 0) { 239 return (ERR_ACCESS); 240 } 241 if (strcmp(name, "nobody") == 0) { 242 /* 243 * Can't change "nobody"s key. 244 */ 245 return (ERR_ACCESS); 246 } 247 248 /* 249 * Open files 250 */ 251 tmpname = malloc(strlen(filename) + 4); 252 if (tmpname == NULL) { 253 return (ERR_MALLOC); 254 } 255 sprintf(tmpname, "%s.tmp", filename); 256 rf = fopen(filename, "r"); 257 if (rf == NULL) { 258 err = ERR_READ; 259 goto cleanup; 260 } 261 wf = fopen(tmpname, "w"); 262 if (wf == NULL) { 263 fclose(rf); 264 err = ERR_WRITE; 265 goto cleanup; 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 err = ERR_DBASE; 306 goto cleanup; 307 } 308 } else { 309 if (unlink(tmpname) < 0) { 310 err = ERR_DBASE; 311 goto cleanup; 312 } 313 } 314 cleanup: 315 free(tmpname); 316 return (err); 317 } 318 319 static int 320 match(char *line, char *name) 321 { 322 int len; 323 324 len = strlen(name); 325 return (strncmp(line, name, len) == 0 && 326 (line[len] == ' ' || line[len] == '\t')); 327 } 328 #endif /* !YP */ 329