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openssl/crypto/asn1/x_crl.c

 /* crypto/asn1/x_crl.c */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
  * 
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
@@ skipping 40 matching lines @@
  * SUCH DAMAGE.
  * 
  * The licence and distribution terms for any publically available version or
  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */
 
 #include <stdio.h>
 #include "cryptlib.h"
+#include "asn1_locl.h"
 #include <openssl/asn1t.h>
 #include <openssl/x509.h>
+#include <openssl/x509v3.h>
 
 static int X509_REVOKED_cmp(const X509_REVOKED * const *a,
                                 const X509_REVOKED * const *b);
+static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
 
 ASN1_SEQUENCE(X509_REVOKED) = {
         ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER),
         ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
         ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
 } ASN1_SEQUENCE_END(X509_REVOKED)
 
+static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
+static int def_crl_lookup(X509_CRL *crl,
+                X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer);
+
+static X509_CRL_METHOD int_crl_meth =
+        {
+        0,
+        0,0,
+        def_crl_lookup,
+        def_crl_verify
+        };
+
+static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
+
 /* The X509_CRL_INFO structure needs a bit of customisation.
  * Since we cache the original encoding the signature wont be affected by
  * reordering of the revoked field.
  */
-static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it)
+static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
+                                                                void *exarg)
 {
         X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
 
         if(!a || !a->revoked) return 1;
         switch(operation) {
                 /* Just set cmp function here. We don't sort because that
                  * would affect the output of X509_CRL_print().
                  */
                 case ASN1_OP_D2I_POST:
                 (void)sk_X509_REVOKED_set_cmp_func(a->revoked,X509_REVOKED_cmp);
                 break;
         }
         return 1;
 }
 
 
 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
         ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
         ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),
         ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
         ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
         ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
         ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
         ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
 
-ASN1_SEQUENCE_ref(X509_CRL, 0, CRYPTO_LOCK_X509_CRL) = {
+/* Set CRL entry issuer according to CRL certificate issuer extension.
+ * Check for unhandled critical CRL entry extensions.
+ */
+
+static int crl_set_issuers(X509_CRL *crl)
+        {
+
+        int i, j;
+        GENERAL_NAMES *gens, *gtmp;
+        STACK_OF(X509_REVOKED) *revoked;
+
+        revoked = X509_CRL_get_REVOKED(crl);
+
+        gens = NULL;
+        for (i = 0; i < sk_X509_REVOKED_num(revoked); i++)
+                {
+                X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
+                STACK_OF(X509_EXTENSION) *exts;
+                ASN1_ENUMERATED *reason;
+                X509_EXTENSION *ext;
+                gtmp = X509_REVOKED_get_ext_d2i(rev, 
+                                                NID_certificate_issuer,
+                                                &j, NULL);
+                if (!gtmp && (j != -1))
+                        {
+                        crl->flags |= EXFLAG_INVALID;
+                        return 1;
+                        }
+
+                if (gtmp)
+                        {
+                        gens = gtmp;
+                        if (!crl->issuers)
+                                {
+                                crl->issuers = sk_GENERAL_NAMES_new_null();
+                                if (!crl->issuers)
+                                        return 0;
+                                }
+                        if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
+                                return 0;
+                        }
+                rev->issuer = gens;
+
+                reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason,
+                                                                &j, NULL);
+                if (!reason && (j != -1))
+                        {
+                        crl->flags |= EXFLAG_INVALID;
+                        return 1;
+                        }
+
+                if (reason)
+                        {
+                        rev->reason = ASN1_ENUMERATED_get(reason);
+                        ASN1_ENUMERATED_free(reason);
+                        }
+                else
+                        rev->reason = CRL_REASON_NONE;  
+
+                /* Check for critical CRL entry extensions */
+
+                exts = rev->extensions;
+
+                for (j = 0; j < sk_X509_EXTENSION_num(exts); j++)
+                        {
+                        ext = sk_X509_EXTENSION_value(exts, j);
+                        if (ext->critical > 0)
+                                {
+                                if (OBJ_obj2nid(ext->object) ==
+                                        NID_certificate_issuer)
+                                        continue;
+                                crl->flags |= EXFLAG_CRITICAL;
+                                break;
+                                }
+                        }
+
+
+                }
+
+        return 1;
+
+        }
+
+/* The X509_CRL structure needs a bit of customisation. Cache some extensions
+ * and hash of the whole CRL.
+ */
+static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
+                                                                void *exarg)
+        {
+        X509_CRL *crl = (X509_CRL *)*pval;
+        STACK_OF(X509_EXTENSION) *exts;
+        X509_EXTENSION *ext;
+        int idx;
+
+        switch(operation)
+                {
+                case ASN1_OP_NEW_POST:
+                crl->idp = NULL;
+                crl->akid = NULL;
+                crl->flags = 0;
+                crl->idp_flags = 0;
+                crl->idp_reasons = CRLDP_ALL_REASONS;
+                crl->meth = default_crl_method;
+                crl->meth_data = NULL;
+                crl->issuers = NULL;
+                crl->crl_number = NULL;
+                crl->base_crl_number = NULL;
+                break;
+
+                case ASN1_OP_D2I_POST:
+#ifndef OPENSSL_NO_SHA
+                X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
+#endif
+                crl->idp = X509_CRL_get_ext_d2i(crl,
+                                NID_issuing_distribution_point, NULL, NULL);
+                if (crl->idp)
+                        setup_idp(crl, crl->idp);
+
+                crl->akid = X509_CRL_get_ext_d2i(crl,
+                                NID_authority_key_identifier, NULL, NULL);      
+
+                crl->crl_number = X509_CRL_get_ext_d2i(crl,
+                                NID_crl_number, NULL, NULL);    
+
+                crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
+                                NID_delta_crl, NULL, NULL);     
+                /* Delta CRLs must have CRL number */
+                if (crl->base_crl_number && !crl->crl_number)
+                        crl->flags |= EXFLAG_INVALID;
+
+                /* See if we have any unhandled critical CRL extensions and 
+                 * indicate this in a flag. We only currently handle IDP so
+                 * anything else critical sets the flag.
+                 *
+                 * This code accesses the X509_CRL structure directly:
+                 * applications shouldn't do this.
+                 */
+
+                exts = crl->crl->extensions;
+
+                for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++)
+                        {
+                        int nid;
+                        ext = sk_X509_EXTENSION_value(exts, idx);
+                        nid = OBJ_obj2nid(ext->object);
+                        if (nid == NID_freshest_crl)
+                                crl->flags |= EXFLAG_FRESHEST;
+                        if (ext->critical > 0)
+                                {
+                                /* We handle IDP and deltas */
+                                if ((nid == NID_issuing_distribution_point)
+                                        || (nid == NID_delta_crl))
+                                        break;;
+                                crl->flags |= EXFLAG_CRITICAL;
+                                break;
+                                }
+                        }
+
+
+                if (!crl_set_issuers(crl))
+                        return 0;
+
+                if (crl->meth->crl_init)
+                        {
+                        if (crl->meth->crl_init(crl) == 0)
+                                return 0;
+                        }
+                break;
+
+                case ASN1_OP_FREE_POST:
+                if (crl->meth->crl_free)
+                        {
+                        if (!crl->meth->crl_free(crl))
+                                return 0;
+                        }
+                if (crl->akid)
+                        AUTHORITY_KEYID_free(crl->akid);
+                if (crl->idp)
+                        ISSUING_DIST_POINT_free(crl->idp);
+                ASN1_INTEGER_free(crl->crl_number);
+                ASN1_INTEGER_free(crl->base_crl_number);
+                sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
+                break;
+                }
+        return 1;
+        }
+
+/* Convert IDP into a more convenient form */
+
+static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
+        {
+        int idp_only = 0;
+        /* Set various flags according to IDP */
+        crl->idp_flags |= IDP_PRESENT;
+        if (idp->onlyuser > 0)
+                {
+                idp_only++;
+                crl->idp_flags |= IDP_ONLYUSER;
+                }
+        if (idp->onlyCA > 0)
+                {
+                idp_only++;
+                crl->idp_flags |= IDP_ONLYCA;
+                }
+        if (idp->onlyattr > 0)
+                {
+                idp_only++;
+                crl->idp_flags |= IDP_ONLYATTR;
+                }
+
+        if (idp_only > 1)
+                crl->idp_flags |= IDP_INVALID;
+
+        if (idp->indirectCRL > 0)
+                crl->idp_flags |= IDP_INDIRECT;
+
+        if (idp->onlysomereasons)
+                {
+                crl->idp_flags |= IDP_REASONS;
+                if (idp->onlysomereasons->length > 0)
+                        crl->idp_reasons = idp->onlysomereasons->data[0];
+                if (idp->onlysomereasons->length > 1)
+                        crl->idp_reasons |=
+                                (idp->onlysomereasons->data[1] << 8);
+                crl->idp_reasons &= CRLDP_ALL_REASONS;
+                }
+
+        DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
+        }
+
+ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {
         ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
         ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
         ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
 
 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
 
@@ skipping 12 matching lines @@
         if(!inf->revoked)
                 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
         if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
                 ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
                 return 0;
         }
         inf->enc.modified = 1;
         return 1;
 }
 
+int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
+        {
+        if (crl->meth->crl_verify)
+                return crl->meth->crl_verify(crl, r);
+        return 0;
+        }
+
+int X509_CRL_get0_by_serial(X509_CRL *crl,
+                X509_REVOKED **ret, ASN1_INTEGER *serial)
+        {
+        if (crl->meth->crl_lookup)
+                return crl->meth->crl_lookup(crl, ret, serial, NULL);
+        return 0;
+        }
+
+int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
+        {
+        if (crl->meth->crl_lookup)
+                return crl->meth->crl_lookup(crl, ret,
+                                                X509_get_serialNumber(x),
+                                                X509_get_issuer_name(x));
+        return 0;
+        }
+
+static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
+        {
+        return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
+                crl->sig_alg, crl->signature,crl->crl,r));
+        }
+
+static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
+                                                X509_REVOKED *rev)
+        {
+        int i;
+
+        if (!rev->issuer)
+                {
+                if (!nm)
+                        return 1;
+                if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
+                        return 1;
+                return 0;
+                }
+
+        if (!nm)
+                nm = X509_CRL_get_issuer(crl);
+
+        for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++)
+                {
+                GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
+                if (gen->type != GEN_DIRNAME)
+                        continue;
+                if (!X509_NAME_cmp(nm, gen->d.directoryName))
+                        return 1;
+                }
+        return 0;
+
+        }
+
+static int def_crl_lookup(X509_CRL *crl,
+                X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer)
+        {
+        X509_REVOKED rtmp, *rev;
+        int idx;
+        rtmp.serialNumber = serial;
+        /* Sort revoked into serial number order if not already sorted.
+         * Do this under a lock to avoid race condition.
+         */
+        if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked))
+                {
+                CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);
+                sk_X509_REVOKED_sort(crl->crl->revoked);
+                CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);
+                }
+        idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp);
+        if(idx < 0)
+                return 0;
+        /* Need to look for matching name */
+        for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++)
+                {
+                rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
+                if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
+                        return 0;
+                if (crl_revoked_issuer_match(crl, issuer, rev))
+                        {
+                        if (ret)
+                                *ret = rev;
+                        if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
+                                return 2;
+                        return 1;
+                        }
+                }
+        return 0;
+        }
+
+void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
+        {
+        if (meth == NULL)
+                default_crl_method = &int_crl_meth;
+        else 
+                default_crl_method = meth;
+        }
+
+X509_CRL_METHOD *X509_CRL_METHOD_new(
+        int (*crl_init)(X509_CRL *crl),
+        int (*crl_free)(X509_CRL *crl),
+        int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
+                                ASN1_INTEGER *ser, X509_NAME *issuer),
+        int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk))
+        {
+        X509_CRL_METHOD *m;
+        m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
+        if (!m)
+                return NULL;
+        m->crl_init = crl_init;
+        m->crl_free = crl_free;
+        m->crl_lookup = crl_lookup;
+        m->crl_verify = crl_verify;
+        m->flags = X509_CRL_METHOD_DYNAMIC;
+        return m;
+        }
+
+void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
+        {
+        if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
+                return;
+        OPENSSL_free(m);
+        }
+
+void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
+        {
+        crl->meth_data = dat;
+        }
+
+void *X509_CRL_get_meth_data(X509_CRL *crl)
+        {
+        return crl->meth_data;
+        }
+
 IMPLEMENT_STACK_OF(X509_REVOKED)
 IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
 IMPLEMENT_STACK_OF(X509_CRL)
 IMPLEMENT_ASN1_SET_OF(X509_CRL)