usr.bin/newkey/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.bin/newkey/update.c,v 1.5 1999/08/28 01:04:35 peter Exp $
  32  * $DragonFly: src/usr.bin/newkey/update.c,v 1.4 2005/01/11 00:29:12 joerg 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 <sys/types.h>
  43 #include <sys/time.h>
  44 #include <sys/resource.h>
  45 #include <pwd.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50
  51 #include <rpc/rpc.h>
  52 #include <rpc/key_prot.h>
  53 #ifdef YP
  54 #include <rpcsvc/yp_prot.h>
  55 #include <rpcsvc/ypclnt.h>
  56 #include <sys/wait.h>
  57 #include <netdb.h>
  58 #endif  /* YP */
  59
  60 #include "externs.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 *basename(char *);
  73 static char SHELL[] = "/bin/sh";
  74 static char YPDBPATH[]="/var/yp";       /* This is defined but not used! */
  75 static char UPDATEFILE[] = "updaters";
  76 #endif  /* YP */
  77
  78 #ifdef YP
  79 static int _openchild(char *, FILE **, FILE ** );
  80
  81 /*
  82  * Determine if requester is allowed to update the given map,
  83  * and update it if so. Returns the yp status, which is zero
  84  * if there is no access violation.
  85  */
  86 int
  87 mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key,
  88           u_int datalen, char *data)
  89 {
  90         char updater[MAXMAPNAMELEN + 40];
  91         FILE *childargs;
  92         FILE *childrslt;
  93 #ifdef WEXITSTATUS
  94         int status;
  95 #else
  96         union wait status;
  97 #endif
  98         pid_t pid;
  99         u_int yperrno;
 100
 101
 102 #ifdef DEBUG
 103         printf("%s %s\n", key, data);
 104 #endif
 105         (void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
 106                                         UPDATEFILE, mapname);
 107         pid = _openchild(updater, &childargs, &childrslt);
 108         if (pid < 0) {
 109                 return (YPERR_YPERR);
 110         }
 111
 112         /*
 113          * Write to child
 114          */
 115         (void)fprintf(childargs, "%s\n", requester);
 116         (void)fprintf(childargs, "%u\n", op);
 117         (void)fprintf(childargs, "%u\n", keylen);
 118         (void)fwrite(key, (int)keylen, 1, childargs);
 119         (void)fprintf(childargs, "\n");
 120         (void)fprintf(childargs, "%u\n", datalen);
 121         (void)fwrite(data, (int)datalen, 1, childargs);
 122         (void)fprintf(childargs, "\n");
 123         (void)fclose(childargs);
 124
 125         /*
 126          * Read from child
 127          */
 128         (void)fscanf(childrslt, "%d", &yperrno);
 129         (void)fclose(childrslt);
 130
 131         (void)wait(&status);
 132 #ifdef WEXITSTATUS
 133         if (WEXITSTATUS(status) != 0) {
 134 #else
 135         if (status.w_retcode != 0) {
 136 #endif
 137                 return (YPERR_YPERR);
 138         }
 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, 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 #define ERR_ACCESS      1
 226 #define ERR_MALLOC      2
 227 #define ERR_READ        3
 228 #define ERR_WRITE       4
 229 #define ERR_DBASE       5
 230 #define ERR_KEY         6
 231
 232 static int match( char * , char * );
 233
 234 /*
 235  * Determine if requester is allowed to update the given map,
 236  * and update it if so. Returns the status, which is zero
 237  * if there is no access violation. This function updates
 238  * the local file and then shuts up.
 239  */
 240 int
 241 localupdate(char *name, char *filename, u_int op, char *key, char *data)
 242 {
 243         char line[256];
 244         FILE *rf;
 245         FILE *wf;
 246         char *tmpname;
 247         int err;
 248
 249         /*
 250          * Check permission
 251          */
 252         if (strcmp(name, key) != 0) {
 253                 return (ERR_ACCESS);
 254         }
 255         if (strcmp(name, "nobody") == 0) {
 256                 /*
 257                  * Can't change "nobody"s key.
 258                  */
 259                 return (ERR_ACCESS);
 260         }
 261
 262         /*
 263          * Open files
 264          */
 265         tmpname = malloc(strlen(filename) + 4);
 266         if (tmpname == NULL) {
 267                 return (ERR_MALLOC);
 268         }
 269         sprintf(tmpname, "%s.tmp", filename);
 270         rf = fopen(filename, "r");
 271         if (rf == NULL) {
 272                 return (ERR_READ);
 273         }
 274         wf = fopen(tmpname, "w");
 275         if (wf == NULL) {
 276                 return (ERR_WRITE);
 277         }
 278         err = -1;
 279         while (fgets(line, sizeof (line), rf)) {
 280                 if (err < 0 && match(line, name)) {
 281                         switch (op) {
 282                         case YPOP_INSERT:
 283                                 err = ERR_KEY;
 284                                 break;
 285                         case YPOP_STORE:
 286                         case YPOP_CHANGE:
 287                                 fprintf(wf, "%s %s\n", key, data);
 288                                 err = 0;
 289                                 break;
 290                         case YPOP_DELETE:
 291                                 /* do nothing */
 292                                 err = 0;
 293                                 break;
 294                         }
 295                 } else {
 296                         fputs(line, wf);
 297                 }
 298         }
 299         if (err < 0) {
 300                 switch (op) {
 301                 case YPOP_CHANGE:
 302                 case YPOP_DELETE:
 303                         err = ERR_KEY;
 304                         break;
 305                 case YPOP_INSERT:
 306                 case YPOP_STORE:
 307                         err = 0;
 308                         fprintf(wf, "%s %s\n", key, data);
 309                         break;
 310                 }
 311         }
 312         fclose(wf);
 313         fclose(rf);
 314         if (err == 0) {
 315                 if (rename(tmpname, filename) < 0) {
 316                         return (ERR_DBASE);
 317                 }
 318         } else {
 319                 if (unlink(tmpname) < 0) {
 320                         return (ERR_DBASE);
 321                 }
 322         }
 323         return (err);
 324 }
 325
 326 static int
 327 match(char *line, char *name)
 328 {
 329         int len;
 330
 331         len = strlen(name);
 332         return (strncmp(line, name, len) == 0 &&
 333                 (line[len] == ' ' || line[len] == '\t'));
 334 }
 335 #endif /* !YP */
 336