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
  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 */