Add pathfinder support for certificate validation

[project/opkg-lede.git] / libopkg / opkg_pathfinder.c

diff --git a/libopkg/opkg_pathfinder.c b/libopkg/opkg_pathfinder.c
new file mode 100644 (file)
index 0000000..793c3a4
--- /dev/null
+++ b/libopkg/opkg_pathfinder.c
@@ -0,0 +1,99 @@
+/* vi: set noexpandtab sw=4 sts=4: */
+/* opkg_download.c - the opkg package management system
+
+   Carl D. Worth
+
+   Copyright (C) 2001 University of Southern California
+   Copyright (C) 2008 OpenMoko Inc
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+*/
+#include "config.h"
+
+#include <openssl/ssl.h>
+#include <libpathfinder.h>
+#include "includes.h"
+#include "opkg_message.h"
+
+#if defined(HAVE_SSLCURL)
+#include <curl/curl.h>
+#endif
+
+#if defined(HAVE_SSLCURL) || defined(HAVE_OPENSSL)
+/*
+ *      This callback is called instead of X509_verify_cert to perform path
+ *      validation on a certificate using pathfinder.
+ *
+ */
+static int pathfinder_verify_callback(X509_STORE_CTX *ctx, void *arg)
+{
+    char *errmsg;
+    const char *hex = "0123456789ABCDEF";
+    size_t size = i2d_X509(ctx->cert, NULL);
+    unsigned char *keybuf, *iend;
+    iend = keybuf = malloc(size);
+    i2d_X509(ctx->cert, &iend);
+    char *certdata_str = malloc(size * 2 + 1);
+    unsigned char *cp = keybuf;
+    char *certdata_str_i = certdata_str;
+    while (cp < iend)
+    {
+        unsigned char ch = *cp++;
+        *certdata_str_i++ = hex[(ch >> 4) & 0xf];
+        *certdata_str_i++ = hex[ch & 0xf];
+    }
+    *certdata_str_i = 0;
+    free(keybuf);
+
+    const char *policy = "2.5.29.32.0"; // anyPolicy
+    int validated = pathfinder_dbus_verify(certdata_str, policy, 0, 0, &errmsg);
+
+    if (!validated)
+        fprintf(stderr, "curlcb_pathfinder: Path verification failed: %s", errmsg);
+
+    free(certdata_str);
+    free(errmsg);
+
+    return validated;
+}
+#endif
+
+
+#if defined(HAVE_OPENSSL)
+int pkcs7_pathfinder_verify_signers(PKCS7* p7)
+{
+    STACK_OF(X509) *signers;
+    int i;
+
+    signers = PKCS7_get0_signers(p7, NULL, 0);
+
+    for(i = 0; i < sk_X509_num(signers); i++){
+       X509_STORE_CTX ctx = {
+           .cert = sk_X509_value(signers, i),
+       };
+
+       if(!pathfinder_verify_callback(&ctx, NULL))
+           return 0;
+    }
+
+    return 1;
+}
+#endif
+
+#if defined(HAVE_SSLCURL)
+CURLcode curl_ssl_ctx_function(CURL * curl, void * sslctx, void * parm) {
+
+  SSL_CTX * ctx = (SSL_CTX *) sslctx;
+  SSL_CTX_set_cert_verify_callback(ctx, pathfinder_verify_callback, parm);
+
+  return CURLE_OK ;
+}
+#endif