1 files changed, 25 insertions, 13 deletions

diff --git a/src/lib/libcrypto/x509v3/v3_purp.c b/src/lib/libcrypto/x509v3/v3_purp.c
index bdcdf95d12..d692a19c25 100644
--- a/src/lib/libcrypto/x509v3/v3_purp.c
+++ b/src/lib/libcrypto/x509v3/v3_purp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: v3_purp.c,v 1.29 2017/01/29 17:49:23 beck Exp $ */
+/* $OpenBSD: v3_purp.c,v 1.30 2017/06/22 17:28:00 jsing Exp $ */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project 2001.
  */
@@ -65,6 +65,14 @@
 #include <openssl/x509v3.h>
 #include <openssl/x509_vfy.h>
 
+#define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
+#define ku_reject(x, usage) \
+        (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
+#define xku_reject(x, usage) \
+        (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
+#define ns_reject(x, usage) \
+        (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
+
 static void x509v3_cache_extensions(X509 *x);
 
 static int check_ssl_ca(const X509 *x);
@@ -427,19 +435,19 @@ x509v3_cache_extensions(X509 *x)
         ASN1_BIT_STRING *ns;
         EXTENDED_KEY_USAGE *extusage;
         X509_EXTENSION *ex;
-
         int i;
+
         if (x->ex_flags & EXFLAG_SET)
                 return;
+
 #ifndef OPENSSL_NO_SHA
         X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
 #endif
-        /* Does subject name match issuer ? */
-        if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x)))
-                x->ex_flags |= EXFLAG_SI;
+
         /* V1 should mean no extensions ... */
         if (!X509_get_version(x))
                 x->ex_flags |= EXFLAG_V1;
+
         /* Handle basic constraints */
         if ((bs = X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) {
                 if (bs->ca)
@@ -456,6 +464,7 @@ x509v3_cache_extensions(X509 *x)
                 BASIC_CONSTRAINTS_free(bs);
                 x->ex_flags |= EXFLAG_BCONS;
         }
+
         /* Handle proxy certificates */
         if ((pci = X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) {
                 if (x->ex_flags & EXFLAG_CA ||
@@ -477,6 +486,7 @@ x509v3_cache_extensions(X509 *x)
                 PROXY_CERT_INFO_EXTENSION_free(pci);
                 x->ex_flags |= EXFLAG_PROXY;
         }
+
         /* Handle key usage */
         if ((usage = X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) {
                 if (usage->length > 0) {
@@ -541,6 +551,16 @@ x509v3_cache_extensions(X509 *x)
 
         x->skid = X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL);
         x->akid = X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL);
+
+        /* Does subject name match issuer? */
+        if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) {
+                x->ex_flags |= EXFLAG_SI;
+                /* If SKID matches AKID also indicate self signed. */
+                if (X509_check_akid(x, x->akid) == X509_V_OK &&
+                    !ku_reject(x, KU_KEY_CERT_SIGN))
+                        x->ex_flags |= EXFLAG_SS;
+        }
+
         x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
         x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL);
         if (!x->nc && (i != -1))
@@ -571,14 +591,6 @@ x509v3_cache_extensions(X509 *x)
  * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
  */
 
-#define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
-#define ku_reject(x, usage) \
-        (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
-#define xku_reject(x, usage) \
-        (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
-#define ns_reject(x, usage) \
-        (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
-
 static int
 check_ca(const X509 *x)
 {