lib/libc/rpc/getpublickey.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  * $FreeBSD: src/lib/libc/rpc/getpublickey.c,v 1.2.6.1 2000/09/20 04:43:11 jkh Exp $
  31  * $DragonFly: src/lib/libc/rpc/getpublickey.c,v 1.3 2005/11/13 12:27:04 swildner Exp $
  32  *
  33  * @(#)publickey.c 1.10 91/03/11 Copyr 1986 Sun Micro
  34  */
  35
  36 /*
  37  * publickey.c
  38  * Copyright (C) 1986, Sun Microsystems, Inc.
  39  */
  40
  41 /*
  42  * Public key lookup routines
  43  */
  44 #include <stdio.h>
  45 #include <pwd.h>
  46 #include <rpc/rpc.h>
  47 #include <rpc/key_prot.h>
  48 #include <rpcsvc/yp_prot.h>
  49 #include <rpcsvc/ypclnt.h>
  50 #include <string.h>
  51 #include <stdlib.h>
  52
  53 #define PKFILE "/etc/publickey"
  54
  55 /*
  56  * Hack to let ypserv/rpc.nisd use AUTH_DES.
  57  */
  58 int (*__getpublickey_LOCAL)() = 0;
  59
  60 /*
  61  * Get somebody's public key
  62  */
  63 int
  64 __getpublickey_real(char *netname, char *publickey)
  65 {
  66         char lookup[3 * HEXKEYBYTES];
  67         char *p;
  68
  69         if (publickey == NULL)
  70                 return (0);
  71         if (!getpublicandprivatekey(netname, lookup))
  72                 return (0);
  73         p = strchr(lookup, ':');
  74         if (p == NULL) {
  75                 return (0);
  76         }
  77         *p = '\0';
  78         strncpy(publickey, lookup, HEXKEYBYTES);
  79         publickey[HEXKEYBYTES] = '\0';
  80         return (1);
  81 }
  82
  83 /*
  84  * reads the file /etc/publickey looking for a + to optionally go to the
  85  * yellow pages
  86  */
  87
  88 int
  89 getpublicandprivatekey(char *key, char *ret)
  90 {
  91         char buf[1024]; /* big enough */
  92         char *res;
  93         FILE *fd;
  94         char *mkey;
  95         char *mval;
  96
  97         fd = fopen(PKFILE, "r");
  98         if (fd == NULL)
  99                 return (0);
 100         for (;;) {
 101                 res = fgets(buf, sizeof(buf), fd);
 102                 if (res == NULL) {
 103                         fclose(fd);
 104                         return (0);
 105                 }
 106                 if (res[0] == '#')
 107                         continue;
 108                 else if (res[0] == '+') {
 109 #ifdef YP
 110                         char *PKMAP = "publickey.byname";
 111                         char *lookup;
 112                         char *domain;
 113                         int err;
 114                         int len;
 115
 116                         err = yp_get_default_domain(&domain);
 117                         if (err) {
 118                                 continue;
 119                         }
 120                         lookup = NULL;
 121                         err = yp_match(domain, PKMAP, key, strlen(key), &lookup, &len);
 122                         if (err) {
 123 #ifdef DEBUG
 124                                 fprintf(stderr, "match failed error %d\n", err);
 125 #endif
 126                                 continue;
 127                         }
 128                         lookup[len] = 0;
 129                         strcpy(ret, lookup);
 130                         fclose(fd);
 131                         free(lookup);
 132                         return (2);
 133 #else /* YP */
 134 #ifdef DEBUG
 135                         fprintf(stderr,
 136 "Bad record in %s '+' -- NIS not supported in this library copy\n", PKFILE);
 137 #endif /* DEBUG */
 138                         continue;
 139 #endif /* YP */
 140                 } else {
 141                         mkey = strsep(&res, "\t ");
 142                         if (mkey == NULL) {
 143                                 fprintf(stderr,
 144                                 "Bad record in %s -- %s", PKFILE, buf);
 145                                 continue;
 146                         }
 147                         do {
 148                                 mval = strsep(&res, " \t#\n");
 149                         } while (mval != NULL && !*mval);
 150                         if (mval == NULL) {
 151                                 fprintf(stderr,
 152                         "Bad record in %s val problem - %s", PKFILE, buf);
 153                                 continue;
 154                         }
 155                         if (strcmp(mkey, key) == 0) {
 156                                 strcpy(ret, mval);
 157                                 fclose(fd);
 158                                 return (1);
 159                         }
 160                 }
 161         }
 162 }
 163
 164 int
 165 getpublickey(char *netname, char *publickey)
 166 {
 167         if (__getpublickey_LOCAL != NULL)
 168                 return(__getpublickey_LOCAL(netname, publickey));
 169         else
 170                 return(__getpublickey_real(netname, publickey));
 171 }