From: Amos Jeffries <amosjeffries@squid-cache.org>
Date: Fri, 1 May 2015 07:16:51 +0000 (-0700)
Subject: Fix X509 server certificate domain matching
X-Git-Tag: SQUID_3_4_13~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=608216a4b49475130cb66f8baaac04dfc0cfabd7;p=thirdparty%2Fsquid.git

Fix X509 server certificate domain matching

The X509 certificate domain fields may contain non-ASCII encodings.
Ensure the domain match algorithm is only passed UTF-8 ASCII-compatible
strings.
---

diff --git a/src/ssl/support.cc b/src/ssl/support.cc
index 561569f556..726dfa8686 100644
--- a/src/ssl/support.cc
+++ b/src/ssl/support.cc
@@ -209,7 +209,13 @@ static int check_domain( void *check_data, ASN1_STRING *cn_data)
     if (cn_data->length > (int)sizeof(cn) - 1) {
         return 1; //if does not fit our buffer just ignore
     }
-    memcpy(cn, cn_data->data, cn_data->length);
+    char *s = reinterpret_cast<char*>(cn_data->data);
+    char *d = cn;
+    for (int i = 0; i < cn_data->length; ++i, ++d, ++s) {
+        if (*s == '\0')
+            return 1; // always a domain mismatch. contains 0x00
+        *d = *s;
+    }
     cn[cn_data->length] = '\0';
     debugs(83, 4, "Verifying server domain " << server << " to certificate name/subjectAltName " << cn);
     return matchDomainName(server, cn[0] == '*' ? cn + 1 : cn);