Guard against DoS in name constraints handling.

This guards against the name constraints check consuming large amounts of CPU time when certificates in the presented chain contain an excessive number of names (specifically subject email names or subject alternative DNS names) and/or name constraints. Name constraints checking compares the names presented in a certificate against the name constraints included in a certificate higher up in the chain using two nested for loops. Move the name constraints check so that it happens after signature verification so peers cannot exploit this using a chain with invalid signatures. Also impose a hard limit on the number of name constraints check loop iterations to further mitigate the issue. Thanks to NCC for finding this issue. Fix written by Martin Kreichgauer. Reviewed-by: Rich Salz <[email protected]> Reviewed-by: Andy Polyakov <[email protected]> (Merged from openssl#4393)
danielctull-forks · Sep 22, 2017 · 8545051 · 8545051
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commit 8545051
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Showing 10 changed files with 2,208 additions and 3 deletions.
diff --git a/crypto/x509/x509_vfy.c b/crypto/x509/x509_vfy.c
@@ -217,7 +217,6 @@ static int verify_chain(X509_STORE_CTX *ctx)
     if ((ok = build_chain(ctx)) == 0 ||
         (ok = check_chain_extensions(ctx)) == 0 ||
         (ok = check_auth_level(ctx)) == 0 ||
-        (ok = check_name_constraints(ctx)) == 0 ||
         (ok = check_id(ctx)) == 0 || 1)
         X509_get_pubkey_parameters(NULL, ctx->chain);
     if (ok == 0 || (ok = ctx->check_revocation(ctx)) == 0)
@@ -235,6 +234,9 @@ static int verify_chain(X509_STORE_CTX *ctx)
     if (!ok)
         return ok;
 
+    if ((ok = check_name_constraints(ctx)) == 0)
+        return ok;
+
 #ifndef OPENSSL_NO_RFC3779
     /* RFC 3779 path validation, now that CRL check has been done */
     if ((ok = X509v3_asid_validate_path(ctx)) == 0)

diff --git a/crypto/x509v3/v3_ncons.c b/crypto/x509v3/v3_ncons.c
@@ -9,6 +9,7 @@
 
 #include "e_os.h"               /* for strncasecmp */
 #include "internal/cryptlib.h"
+#include <limits.h>
 #include <stdio.h>
 #include "internal/asn1_int.h"
 #include <openssl/asn1t.h>
@@ -166,6 +167,22 @@ static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
     return 1;
 }
 
+#define NAME_CHECK_MAX (1 << 20)
+
+static int add_lengths(int *out, int a, int b)
+{
+    /* sk_FOO_num(NULL) returns -1 but is effectively 0 when iterating. */
+    if (a < 0)
+        a = 0;
+    if (b < 0)
+        b = 0;
+
+    if (a > INT_MAX - b)
+        return 0;
+    *out = a + b;
+    return 1;
+}
+
 /*-
  * Check a certificate conforms to a specified set of constraints.
  * Return values:
@@ -180,11 +197,23 @@ static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
 
 int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
 {
-    int r, i;
+    int r, i, name_count, constraint_count;
     X509_NAME *nm;
 
     nm = X509_get_subject_name(x);
 
+    /*
+     * Guard against certificates with an excessive number of names or
+     * constraints causing a computationally expensive name constraints check.
+     */
+    if (!add_lengths(&name_count, X509_NAME_entry_count(nm),
+                     sk_GENERAL_NAME_num(x->altname))
+        || !add_lengths(&constraint_count,
+                        sk_GENERAL_SUBTREE_num(nc->permittedSubtrees),
+                        sk_GENERAL_SUBTREE_num(nc->excludedSubtrees))
+        || (name_count > 0 && constraint_count > NAME_CHECK_MAX / name_count))
+        return X509_V_ERR_UNSPECIFIED;
+
     if (X509_NAME_entry_count(nm) > 0) {
         GENERAL_NAME gntmp;
         gntmp.type = GEN_DIRNAME;

diff --git a/test/certs/many-constraints.pem b/test/certs/many-constraints.pem
diff --git a/test/certs/many-names1.pem b/test/certs/many-names1.pem
diff --git a/test/certs/many-names2.pem b/test/certs/many-names2.pem
diff --git a/test/certs/many-names3.pem b/test/certs/many-names3.pem
diff --git a/test/certs/some-names1.pem b/test/certs/some-names1.pem
@@ -0,0 +1,211 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----