Commit 8545051c authored by David Benjamin's avatar David Benjamin Committed by Andy Polyakov
Browse files

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: default avatarRich Salz <rsalz@openssl.org>
Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4393)
parent 79b4444d

crypto/x509/x509_vfy.c

+3 −1
Original line number Diff line number Diff line
@@ -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)

crypto/x509v3/v3_ncons.c

+30 −1
Original line number Diff line number Diff line
@@ -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;

test/certs/many-constraints.pem

0 → 100644
+292 −0
Original line number Diff line number Diff line 
-----BEGIN CERTIFICATE-----

MII2MzCCNRugAwIBAgIBATANBgkqhkiG9w0BAQsFADANMQswCQYDVQQDEwJDQTAg

Fw0wMDAxMDEwMDAwMDBaGA8yMTAwMDEwMTAwMDAwMFowDTELMAkGA1UEAxMCQ0Ew

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6BsnsA2jNg==

-----END CERTIFICATE-----

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