usr.sbin/rpc.ypupdated/update.c

   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  * @(#)update.c 1.2 91/03/11 Copyr 1986 Sun Micro
  31  * $FreeBSD: src/usr.sbin/rpc.ypupdated/update.c,v 1.4.2.1 2002/02/15 00:46:57 des Exp $
  32  * $DragonFly: src/usr.sbin/rpc.ypupdated/update.c,v 1.4 2005/11/25 00:32:49 swildner Exp $
  33  */
  34
  35 /*
  36  * Copyright (C) 1986, 1989, Sun Microsystems, Inc.
  37  */
  38
  39 /*
  40  * Administrative tool to add a new user to the publickey database
  41  */
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45 #include <rpc/rpc.h>
  46 #include <rpc/key_prot.h>
  47 #ifdef YP
  48 #include <rpcsvc/yp_prot.h>
  49 #include <rpcsvc/ypclnt.h>
  50 #include <sys/wait.h>
  51 #include <netdb.h>
  52 #endif  /* YP */
  53 #include <pwd.h>
  54 #include <string.h>
  55 #include <sys/resource.h>
  56 #include <stdlib.h>
  57 #include "ypupdated_extern.h"
  58
  59 #ifdef YP
  60 #define MAXMAPNAMELEN 256
  61 #else
  62 #define YPOP_CHANGE 1                   /* change, do not add */
  63 #define YPOP_INSERT 2                   /* add, do not change */
  64 #define YPOP_DELETE 3                   /* delete this entry */
  65 #define YPOP_STORE  4                   /* add, or change */
  66 #endif
  67
  68 #ifdef YP
  69 static char SHELL[] = "/bin/sh";
  70 static char YPDBPATH[]="/var/yp";       /* This is defined but not used! */
  71 static char PKMAP[] = "publickey.byname";
  72 static char UPDATEFILE[] = "updaters";
  73 static char PKFILE[] = "/etc/publickey";
  74 #endif  /* YP */
  75
  76 #ifdef YP
  77 static int _openchild(char *, FILE **, FILE **);
  78
  79 /*
  80  * Determine if requester is allowed to update the given map,
  81  * and update it if so. Returns the yp status, which is zero
  82  * if there is no access violation.
  83  */
  84 mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key,
  85           u_int datalen, char *data)
  86 {
  87         char updater[MAXMAPNAMELEN + 40];
  88         FILE *childargs;
  89         FILE *childrslt;
  90 #ifdef WEXITSTATUS
  91         int status;
  92 #else
  93         union wait status;
  94 #endif
  95         pid_t pid;
  96         u_int yperrno;
  97
  98
  99 #ifdef DEBUG
 100         printf("%s %s\n", key, data);
 101 #endif
 102         sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
 103                 UPDATEFILE, mapname);
 104         pid = _openchild(updater, &childargs, &childrslt);
 105         if (pid < 0) {
 106                 return (YPERR_YPERR);
 107         }
 108
 109         /*
 110          * Write to child
 111          */
 112         fprintf(childargs, "%s\n", requester);
 113         fprintf(childargs, "%u\n", op);
 114         fprintf(childargs, "%u\n", keylen);
 115         fwrite(key, (int)keylen, 1, childargs);
 116         fprintf(childargs, "\n");
 117         fprintf(childargs, "%u\n", datalen);
 118         fwrite(data, (int)datalen, 1, childargs);
 119         fprintf(childargs, "\n");
 120         fclose(childargs);
 121
 122         /*
 123          * Read from child
 124          */
 125         fscanf(childrslt, "%d", &yperrno);
 126         fclose(childrslt);
 127
 128         wait(&status);
 129 #ifdef WEXITSTATUS
 130         if (WEXITSTATUS(status) != 0) {
 131 #else
 132         if (status.w_retcode != 0) {
 133 #endif
 134                 return (YPERR_YPERR);
 135         }
 136         return (yperrno);
 137 }
 138
 139 /*
 140  * returns pid, or -1 for failure
 141  */
 142 static
 143 _openchild(char *command, FILE **fto, FILE **ffrom)
 144 {
 145         int i;
 146         pid_t pid;
 147         int pdto[2];
 148         int pdfrom[2];
 149         char *com;
 150         struct rlimit rl;
 151
 152         if (pipe(pdto) < 0) {
 153                 goto error1;
 154         }
 155         if (pipe(pdfrom) < 0) {
 156                 goto error2;
 157         }
 158 #ifdef VFORK
 159         switch (pid = vfork()) {
 160 #else
 161         switch (pid = fork()) {
 162 #endif
 163         case -1:
 164                 goto error3;
 165
 166         case 0:
 167                 /*
 168                  * child: read from pdto[0], write into pdfrom[1]
 169                  */
 170                 close(0);
 171                 dup(pdto[0]);
 172                 close(1);
 173                 dup(pdfrom[1]);
 174                 getrlimit(RLIMIT_NOFILE, &rl);
 175                 for (i = rl.rlim_max - 1; i >= 3; i--) {
 176                         close(i);
 177                 }
 178                 com = malloc((unsigned) strlen(command) + 6);
 179                 if (com == NULL) {
 180                         _exit(~0);
 181                 }
 182                 sprintf(com, "exec %s", command);
 183                 execl(SHELL, basename(SHELL), "-c", com, 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                 close(pdto[0]);
 192                 *ffrom = fdopen(pdfrom[0], "r");
 193                 close(pdfrom[1]);
 194                 break;
 195         }
 196         return (pid);
 197
 198         /*
 199          * error cleanup and return
 200          */
 201 error3:
 202         close(pdfrom[0]);
 203         close(pdfrom[1]);
 204 error2:
 205         close(pdto[0]);
 206         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 #ifdef foo
 227 #define ERR_ACCESS      1
 228 #define ERR_MALLOC      2
 229 #define ERR_READ        3
 230 #define ERR_WRITE       4
 231 #define ERR_DBASE       5
 232 #define ERR_KEY         6
 233 extern char *malloc();
 234 #endif
 235
 236 static int match(char *, char *);
 237
 238 /*
 239  * Determine if requester is allowed to update the given map,
 240  * and update it if so. Returns the status, which is zero
 241  * if there is no access violation. This function updates
 242  * the local file and then shuts up.
 243  *
 244  * Parameters:
 245  *      name:           Name of the requestor
 246  *      keylen:         Not used
 247  *      datalen:        Not used
 248  */
 249 int
 250 localupdate(char *name, char *filename, u_int op, u_int keylen, char *key,
 251             u_int datalen, char *data)
 252 {
 253         char line[256];
 254         FILE *rf;
 255         FILE *wf;
 256         char *tmpname;
 257         int err;
 258
 259         /*
 260          * Check permission
 261          */
 262         if (strcmp(name, key) != 0) {
 263                 return (ERR_ACCESS);
 264         }
 265         if (strcmp(name, "nobody") == 0) {
 266                 /*
 267                  * Can't change "nobody"s key.
 268                  */
 269                 return (ERR_ACCESS);
 270         }
 271
 272         /*
 273          * Open files
 274          */
 275         tmpname = malloc(strlen(filename) + 4);
 276         if (tmpname == NULL) {
 277                 return (ERR_MALLOC);
 278         }
 279         sprintf(tmpname, "%s.tmp", filename);
 280         rf = fopen(filename, "r");
 281         if (rf == NULL) {
 282                 return (ERR_READ);
 283         }
 284         wf = fopen(tmpname, "w");
 285         if (wf == NULL) {
 286                 return (ERR_WRITE);
 287         }
 288         err = -1;
 289         while (fgets(line, sizeof (line), rf)) {
 290                 if (err < 0 && match(line, name)) {
 291                         switch (op) {
 292                         case YPOP_INSERT:
 293                                 err = ERR_KEY;
 294                                 break;
 295                         case YPOP_STORE:
 296                         case YPOP_CHANGE:
 297                                 fprintf(wf, "%s %s\n", key, data);
 298                                 err = 0;
 299                                 break;
 300                         case YPOP_DELETE:
 301                                 /* do nothing */
 302                                 err = 0;
 303                                 break;
 304                         }
 305                 } else {
 306                         fputs(line, wf);
 307                 }
 308         }
 309         if (err < 0) {
 310                 switch (op) {
 311                 case YPOP_CHANGE:
 312                 case YPOP_DELETE:
 313                         err = ERR_KEY;
 314                         break;
 315                 case YPOP_INSERT:
 316                 case YPOP_STORE:
 317                         err = 0;
 318                         fprintf(wf, "%s %s\n", key, data);
 319                         break;
 320                 }
 321         }
 322         fclose(wf);
 323         fclose(rf);
 324         if (err == 0) {
 325                 if (rename(tmpname, filename) < 0) {
 326                         return (ERR_DBASE);
 327                 }
 328         } else {
 329                 if (unlink(tmpname) < 0) {
 330                         return (ERR_DBASE);
 331                 }
 332         }
 333         return (err);
 334 }
 335
 336 static int
 337 match(char *line, char *name)
 338 {
 339         int len;
 340
 341         len = strlen(name);
 342         return (strncmp(line, name, len) == 0 &&
 343                 (line[len] == ' ' || line[len] == '\t'));
 344 }
 345 #endif /* !YP */
 346