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 1.9 2006/02/28 16:02:26 deischen 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 "namespace.h"
  45 #include <stdio.h>
  46 #include <pwd.h>
  47 #include <rpc/rpc.h>
  48 #include <rpc/key_prot.h>
  49 #include <rpcsvc/yp_prot.h>
  50 #include <rpcsvc/ypclnt.h>
  51 #include <string.h>
  52 #include <stdlib.h>
  53 #include "un-namespace.h"
  54
  55 #define PKFILE "/etc/publickey"
  56
  57 /*
  58  * Hack to let ypserv/rpc.nisd use AUTH_DES.
  59  */
  60 int (*__getpublickey_LOCAL)() = 0;
  61
  62 /*
  63  * Get somebody's public key
  64  */
  65 static int
  66 __getpublickey_real(const char *netname, char *publickey)
  67 {
  68         char lookup[3 * HEXKEYBYTES];
  69         char *p;
  70
  71         if (publickey == NULL)
  72                 return (0);
  73         if (!getpublicandprivatekey(netname, lookup))
  74                 return (0);
  75         p = strchr(lookup, ':');
  76         if (p == NULL) {
  77                 return (0);
  78         }
  79         *p = '\0';
  80         strncpy(publickey, lookup, HEXKEYBYTES);
  81         publickey[HEXKEYBYTES] = '\0';
  82         return (1);
  83 }
  84
  85 /*
  86  * reads the file /etc/publickey looking for a + to optionally go to the
  87  * yellow pages
  88  */
  89
  90 int
  91 getpublicandprivatekey(const char *key, char *ret)
  92 {
  93         char buf[1024]; /* big enough */
  94         char *res;
  95         FILE *fd;
  96         char *mkey;
  97         char *mval;
  98
  99         fd = fopen(PKFILE, "r");
 100         if (fd == NULL)
 101                 return (0);
 102         for (;;) {
 103                 res = fgets(buf, sizeof(buf), fd);
 104                 if (res == NULL) {
 105                         fclose(fd);
 106                         return (0);
 107                 }
 108                 if (res[0] == '#')
 109                         continue;
 110                 else if (res[0] == '+') {
 111 #ifdef YP
 112                         char *PKMAP = "publickey.byname";
 113                         char *lookup;
 114                         char *domain;
 115                         int err;
 116                         int len;
 117
 118                         err = yp_get_default_domain(&domain);
 119                         if (err) {
 120                                 continue;
 121                         }
 122                         lookup = NULL;
 123                         err = yp_match(domain, PKMAP, key, strlen(key), &lookup, &len);
 124                         if (err) {
 125 #ifdef DEBUG
 126                                 fprintf(stderr, "match failed error %d\n", err);
 127 #endif
 128                                 continue;
 129                         }
 130                         lookup[len] = 0;
 131                         strcpy(ret, lookup);
 132                         fclose(fd);
 133                         free(lookup);
 134                         return (2);
 135 #else /* YP */
 136 #ifdef DEBUG
 137                         fprintf(stderr,
 138 "Bad record in %s '+' -- NIS not supported in this library copy\n", PKFILE);
 139 #endif /* DEBUG */
 140                         continue;
 141 #endif /* YP */
 142                 } else {
 143                         mkey = strsep(&res, "\t ");
 144                         if (mkey == NULL) {
 145                                 fprintf(stderr,
 146                                 "Bad record in %s -- %s", PKFILE, buf);
 147                                 continue;
 148                         }
 149                         do {
 150                                 mval = strsep(&res, " \t#\n");
 151                         } while (mval != NULL && !*mval);
 152                         if (mval == NULL) {
 153                                 fprintf(stderr,
 154                         "Bad record in %s val problem - %s", PKFILE, buf);
 155                                 continue;
 156                         }
 157                         if (strcmp(mkey, key) == 0) {
 158                                 strcpy(ret, mval);
 159                                 fclose(fd);
 160                                 return (1);
 161                         }
 162                 }
 163         }
 164 }
 165
 166 int
 167 getpublickey(const char *netname, char *publickey)
 168 {
 169         if (__getpublickey_LOCAL != NULL)
 170                 return(__getpublickey_LOCAL(netname, publickey));
 171         else
 172                 return(__getpublickey_real(netname, publickey));
 173 }