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