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
  21 #if defined(HAVE_SSLCURL)
  22 #include <curl/curl.h>
  23 #endif
  24
  25 #include "includes.h"
  26 #include "libbb/libbb.h"
  27 #include "opkg_message.h"
  28
  29 #if defined(HAVE_SSLCURL) || defined(HAVE_OPENSSL)
  30 /*
  31  *      This callback is called instead of X509_verify_cert to perform path
  32  *      validation on a certificate using pathfinder.
  33  *
  34  */
  35 static int pathfinder_verify_callback(X509_STORE_CTX *ctx, void *arg)
  36 {
  37     char *errmsg;
  38     const char *hex = "0123456789ABCDEF";
  39     size_t size = i2d_X509(ctx->cert, NULL);
  40     unsigned char *keybuf, *iend;
  41     iend = keybuf = xmalloc(size);
  42     i2d_X509(ctx->cert, &iend);
  43     char *certdata_str = xmalloc(size * 2 + 1);
  44     unsigned char *cp = keybuf;
  45     char *certdata_str_i = certdata_str;
  46     while (cp < iend)
  47     {
  48         unsigned char ch = *cp++;
  49         *certdata_str_i++ = hex[(ch >> 4) & 0xf];
  50         *certdata_str_i++ = hex[ch & 0xf];
  51     }
  52     *certdata_str_i = 0;
  53     free(keybuf);
  54
  55     const char *policy = "2.5.29.32.0"; // anyPolicy
  56     int validated = pathfinder_dbus_verify(certdata_str, policy, 0, 0, &errmsg);
  57
  58     if (!validated)
  59         opkg_msg(ERROR, "Path verification failed: %s.\n", errmsg);
  60
  61     free(certdata_str);
  62     free(errmsg);
  63
  64     return validated;
  65 }
  66 #endif
  67
  68 #if defined(HAVE_OPENSSL)
  69 int pkcs7_pathfinder_verify_signers(PKCS7* p7)
  70 {
  71     STACK_OF(X509) *signers;
  72     int i, ret = 1; /* signers are verified by default */
  73
  74     signers = PKCS7_get0_signers(p7, NULL, 0);
  75
  76     for(i = 0; i < sk_X509_num(signers); i++){
  77         X509_STORE_CTX ctx = {
  78             .cert = sk_X509_value(signers, i),
  79         };
  80
  81         if(!pathfinder_verify_callback(&ctx, NULL)){
  82             /* Signer isn't verified ! goto jail; */
  83             ret = 0;
  84             break;
  85         }
  86     }
  87
  88     sk_X509_free(signers);
  89     return ret;
  90 }
  91 #endif
  92
  93 #if defined(HAVE_SSLCURL)
  94 CURLcode curl_ssl_ctx_function(CURL * curl, void * sslctx, void * parm) {
  95
  96   SSL_CTX * ctx = (SSL_CTX *) sslctx;
  97   SSL_CTX_set_cert_verify_callback(ctx, pathfinder_verify_callback, parm);
  98
  99   return CURLE_OK ;
 100 }
 101 #endif