From 2b86b4b79495cf2e859f0d5e6e9a3d6ece6e0fe7 Mon Sep 17 00:00:00 2001
From: Fumitoshi UKAI <ukai@debian.or.jp>
Date: Wed, 26 Dec 2001 12:58:49 +0000
Subject: RFC2818 server identity check update

---
 istream.c | 111 +++++++++++++++++++++++++++++++++-----------------------------
 1 file changed, 60 insertions(+), 51 deletions(-)

(limited to 'istream.c')

diff --git a/istream.c b/istream.c
index 1e11e8f..988d818 100644
--- a/istream.c
+++ b/istream.c
@@ -1,7 +1,10 @@
-/* $Id: istream.c,v 1.7 2001/12/26 12:18:06 ukai Exp $ */
+/* $Id: istream.c,v 1.8 2001/12/26 12:58:49 ukai Exp $ */
 #include "fm.h"
 #include "istream.h"
 #include <signal.h>
+#ifdef USE_SSL
+#include <x509v3.h>
+#endif
 
 #define	uchar		unsigned char
 
@@ -380,11 +383,12 @@ ssl_get_certificate(InputStream stream)
 }
 
 Str
-ssl_check_cert_ident(SSL *handle, char *hostname)
+ssl_check_cert_ident(SSL * handle, char *hostname)
 {
     X509 *x;
     int i;
-    Str ret = Strnew_charp("SSL error: failed to check certificate chain");
+    Str ret = NULL;
+    int match_ident = FALSE;
     /*
      * All we need to do here is check that the CN matches.
      *
@@ -396,67 +400,72 @@ ssl_check_cert_ident(SSL *handle, char *hostname)
      * Certification Authorities are encouraged to use the dNSName instead.
      */
     x = SSL_get_peer_certificate(handle);
-    if (!x) {   
+    if (!x) {
 	ret = Strnew_charp("Unable to get peer certificate");
 	return ret;
     }
 
     i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
-    if (i >= 0) {   
-        X509_EXTENSION *ex;
-        STACK_OF(GENERAL_NAME) *alt;
-
-        ex = X509_get_ext(x, i);
-        alt = X509V3_EXT_d2i(ex);
-        if (alt) {   
-            int n, len1, len2 = 0;
-            char *domain;
-            GENERAL_NAME *gn;
-            X509V3_EXT_METHOD *method;
-
-            len1 = strlen(hostname);
-            n = sk_GENERAL_NAME_num(alt);
-            domain = strchr(hostname, '.');
-            if (domain)
-                len2 = len1 - (domain - hostname);
-            for (i = 0; i < n; i++) {
-                gn = sk_GENERAL_NAME_value(alt, i);
-                if (gn->type == GEN_DNS) {
-                    char *sn = ASN1_STRING_data(gn->d.ia5);
-                    int sl = ASN1_STRING_length(gn->d.ia5);
-
-                    /* Is this an exact match? */
-                    if ((len1 == sl) && !strncasecmp(hostname, sn, len1))
-                        break;
-
-                    /* Is this a wildcard match? */
-                    if ((*sn == '*') && domain && (len2 == sl-1) &&
-                        !strncasecmp(domain, sn+1, len2))
-                        break;
-                }
-            }
-            method = X509V3_EXT_get(ex);
-            method->ext_free(alt);
-            if (i < n)  /* Found a match */
-                ret = NULL;
-        }
+    if (i >= 0) {
+	X509_EXTENSION *ex;
+	STACK_OF(GENERAL_NAME) * alt;
+
+	ex = X509_get_ext(x, i);
+	alt = X509V3_EXT_d2i(ex);
+	if (alt) {
+	    int n, len1, len2 = 0;
+	    char *domain;
+	    GENERAL_NAME *gn;
+	    X509V3_EXT_METHOD *method;
+	    Str seen_dnsname = NULL;
+
+	    len1 = strlen(hostname);
+	    n = sk_GENERAL_NAME_num(alt);
+	    domain = strchr(hostname, '.');
+	    if (domain)
+		len2 = len1 - (domain - hostname);
+	    for (i = 0; i < n; i++) {
+		gn = sk_GENERAL_NAME_value(alt, i);
+		if (gn->type == GEN_DNS) {
+		    char *sn = ASN1_STRING_data(gn->d.ia5);
+		    int sl = ASN1_STRING_length(gn->d.ia5);
+
+		    if (!seen_dnsname)
+			seen_dnsname = Strnew();
+		    Strcat_m_charp(seen_dnsname, sn, " ");
+		    /* Is this an exact match? */
+		    if ((len1 == sl) && !strncasecmp(hostname, sn, len1))
+			break;
+
+		    /* Is this a wildcard match? */
+		    if ((*sn == '*') && domain && (len2 == sl - 1) &&
+			!strncasecmp(domain, sn + 1, len2))
+			break;
+		}
+	    }
+	    method = X509V3_EXT_get(ex);
+	    method->ext_free(alt);
+	    if (i < n)		/* Found a match */
+		match_ident = TRUE;
+	    else if (seen_dnsname)
+		ret = Sprintf("Bad cert ident from %s: dNSName=%s", hostname,
+			      seen_dnsname->ptr);
+	}
     }
 
-    if (ret != NULL) {
-        X509_NAME *xn;
-        char buf[2048];
+    if (match_ident == FALSE && ret == NULL) {
+	X509_NAME *xn;
+	char buf[2048];
 
-        xn = X509_get_subject_name(x);
+	xn = X509_get_subject_name(x);
 
-        if (X509_NAME_get_text_by_NID(xn, NID_commonName, 
-				      buf, sizeof(buf)) == -1) {
+	if (X509_NAME_get_text_by_NID(xn, NID_commonName,
+				      buf, sizeof(buf)) == -1)
 	    ret = Strnew_charp("Unable to get common name from peer cert");
-	    return ret;
-        }
 	else if (strcasecmp(hostname, buf))
 	    ret = Sprintf("Bad cert ident %s from %s", buf, hostname);
 	else
-	    ret = NULL;
+	    match_ident = TRUE;
     }
     X509_free(x);
     return ret;
-- 
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