libopkg/opkg_pathfinder.c

   1 /* vi: set noexpandtab sw=4 sts=4: */
   2 /* opkg_pathfinder.c - the opkg package management system
   3
   4    Copyright (C) 2009 Camille Moncelier <moncelier@devlife.org>
   5
   6    This program is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU General Public License as
   8    published by the Free Software Foundation; either version 2, or (at
   9    your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful, but
  12    WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    General Public License for more details.
  15 */
  16 #include "config.h"
  17
  18 #include <openssl/ssl.h>
  19 #include <libpathfinder.h>
  20 #include <stdlib.h>
  21 #if defined(HAVE_SSLCURL)
  22 #include <curl/curl.h>
  23 #endif
  24
  25 #include "libbb/libbb.h"
  26 #include "opkg_message.h"
  27
  28 #if defined(HAVE_SSLCURL) || defined(HAVE_OPENSSL)
  29 /*
  30  *      This callback is called instead of X509_verify_cert to perform path
  31  *      validation on a certificate using pathfinder.
  32  *
  33  */
  34 static int pathfinder_verify_callback(X509_STORE_CTX *ctx, void *arg)
  35 {
  36     char *errmsg;
  37     const char *hex = "0123456789ABCDEF";
  38     size_t size = i2d_X509(ctx->cert, NULL);
  39     unsigned char *keybuf, *iend;
  40     iend = keybuf = xmalloc(size);
  41     i2d_X509(ctx->cert, &iend);
  42     char *certdata_str = xmalloc(size * 2 + 1);
  43     unsigned char *cp = keybuf;
  44     char *certdata_str_i = certdata_str;
  45     while (cp < iend)
  46     {
  47         unsigned char ch = *cp++;
  48         *certdata_str_i++ = hex[(ch >> 4) & 0xf];
  49         *certdata_str_i++ = hex[ch & 0xf];
  50     }
  51     *certdata_str_i = 0;
  52     free(keybuf);
  53
  54     const char *policy = "2.5.29.32.0"; // anyPolicy
  55     int validated = pathfinder_dbus_verify(certdata_str, policy, 0, 0, &errmsg);
  56
  57     if (!validated)
  58         opkg_msg(ERROR, "Path verification failed: %s.\n", errmsg);
  59
  60     free(certdata_str);
  61     free(errmsg);
  62
  63     return validated;
  64 }
  65 #endif
  66
  67 #if defined(HAVE_OPENSSL)
  68 int pkcs7_pathfinder_verify_signers(PKCS7* p7)
  69 {
  70     STACK_OF(X509) *signers;
  71     int i, ret = 1; /* signers are verified by default */
  72
  73     signers = PKCS7_get0_signers(p7, NULL, 0);
  74
  75     for(i = 0; i < sk_X509_num(signers); i++){
  76         X509_STORE_CTX ctx = {
  77             .cert = sk_X509_value(signers, i),
  78         };
  79
  80         if(!pathfinder_verify_callback(&ctx, NULL)){
  81             /* Signer isn't verified ! goto jail; */
  82             ret = 0;
  83             break;
  84         }
  85     }
  86
  87     sk_X509_free(signers);
  88     return ret;
  89 }
  90 #endif
  91
  92 #if defined(HAVE_SSLCURL)
  93 CURLcode curl_ssl_ctx_function(CURL * curl, void * sslctx, void * parm) {
  94
  95   SSL_CTX * ctx = (SSL_CTX *) sslctx;
  96   SSL_CTX_set_cert_verify_callback(ctx, pathfinder_verify_callback, parm);
  97
  98   return CURLE_OK ;
  99 }
 100 #endif