lib/libc/rpc/getpublickey.c

   1 /*-
   2  * Copyright (c) 2009, Sun Microsystems, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  * - Redistributions of source code must retain the above copyright notice,
   8  *   this list of conditions and the following disclaimer.
   9  * - Redistributions in binary form must reproduce the above copyright notice,
  10  *   this list of conditions and the following disclaimer in the documentation
  11  *   and/or other materials provided with the distribution.
  12  * - Neither the name of Sun Microsystems, Inc. nor the names of its
  13  *   contributors may be used to endorse or promote products derived
  14  *   from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/lib/libc/rpc/getpublickey.c,v 1.9 2006/02/28 16:02:26 deischen Exp $
  29  *
  30  * @(#)publickey.c 1.10 91/03/11 Copyr 1986 Sun Micro
  31  */
  32
  33 /*
  34  * publickey.c
  35  * Copyright (C) 1986, Sun Microsystems, Inc.
  36  */
  37
  38 /*
  39  * Public key lookup routines
  40  */
  41 #include "namespace.h"
  42 #include <stdio.h>
  43 #include <pwd.h>
  44 #include <rpc/rpc.h>
  45 #include <rpc/key_prot.h>
  46 #include <rpcsvc/yp_prot.h>
  47 #include <rpcsvc/ypclnt.h>
  48 #include <string.h>
  49 #include <stdlib.h>
  50 #include "un-namespace.h"
  51
  52 #define PKFILE "/etc/publickey"
  53
  54 /*
  55  * Hack to let ypserv/rpc.nisd use AUTH_DES.
  56  */
  57 int (*__getpublickey_LOCAL)() = NULL;
  58
  59 /*
  60  * Get somebody's public key
  61  */
  62 static int
  63 __getpublickey_real(const char *netname, char *publickey)
  64 {
  65         char lookup[3 * HEXKEYBYTES];
  66         char *p;
  67
  68         if (publickey == NULL)
  69                 return (0);
  70         if (!getpublicandprivatekey(netname, lookup))
  71                 return (0);
  72         p = strchr(lookup, ':');
  73         if (p == NULL) {
  74                 return (0);
  75         }
  76         *p = '\0';
  77         strncpy(publickey, lookup, HEXKEYBYTES);
  78         publickey[HEXKEYBYTES] = '\0';
  79         return (1);
  80 }
  81
  82 /*
  83  * reads the file /etc/publickey looking for a + to optionally go to the
  84  * yellow pages
  85  */
  86
  87 int
  88 getpublicandprivatekey(const char *key, char *ret)
  89 {
  90         char buf[1024]; /* big enough */
  91         char *res;
  92         FILE *fd;
  93         char *mkey;
  94         char *mval;
  95
  96         fd = fopen(PKFILE, "r");
  97         if (fd == NULL)
  98                 return (0);
  99         for (;;) {
 100                 res = fgets(buf, sizeof(buf), fd);
 101                 if (res == NULL) {
 102                         fclose(fd);
 103                         return (0);
 104                 }
 105                 if (res[0] == '#')
 106                         continue;
 107                 else if (res[0] == '+') {
 108 #ifdef YP
 109                         char *PKMAP = "publickey.byname";
 110                         char *lookup;
 111                         char *domain;
 112                         int err;
 113                         int len;
 114
 115                         err = yp_get_default_domain(&domain);
 116                         if (err) {
 117                                 continue;
 118                         }
 119                         lookup = NULL;
 120                         err = yp_match(domain, PKMAP, key, strlen(key), &lookup, &len);
 121                         if (err) {
 122 #ifdef DEBUG
 123                                 fprintf(stderr, "match failed error %d\n", err);
 124 #endif
 125                                 continue;
 126                         }
 127                         lookup[len] = 0;
 128                         strcpy(ret, lookup);
 129                         fclose(fd);
 130                         free(lookup);
 131                         return (2);
 132 #else /* YP */
 133 #ifdef DEBUG
 134                         fprintf(stderr,
 135 "Bad record in %s '+' -- NIS not supported in this library copy\n", PKFILE);
 136 #endif /* DEBUG */
 137                         continue;
 138 #endif /* YP */
 139                 } else {
 140                         mkey = strsep(&res, "\t ");
 141                         if (mkey == NULL) {
 142                                 fprintf(stderr,
 143                                 "Bad record in %s -- %s", PKFILE, buf);
 144                                 continue;
 145                         }
 146                         do {
 147                                 mval = strsep(&res, " \t#\n");
 148                         } while (mval != NULL && !*mval);
 149                         if (mval == NULL) {
 150                                 fprintf(stderr,
 151                         "Bad record in %s val problem - %s", PKFILE, buf);
 152                                 continue;
 153                         }
 154                         if (strcmp(mkey, key) == 0) {
 155                                 strcpy(ret, mval);
 156                                 fclose(fd);
 157                                 return (1);
 158                         }
 159                 }
 160         }
 161 }
 162
 163 int
 164 getpublickey(const char *netname, char *publickey)
 165 {
 166         if (__getpublickey_LOCAL != NULL)
 167                 return(__getpublickey_LOCAL(netname, publickey));
 168         else
 169                 return(__getpublickey_real(netname, publickey));
 170 }