--- /dev/null
+/* v3_purp.c */
+/*
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
+ * 2001.
+ */
+/* ====================================================================
+ * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ * software must display the following acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For written permission, please contact
+ * licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ * nor may "OpenSSL" appear in their names without prior written
+ * permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by the OpenSSL Project
+ * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com). This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com). */
+
+#include <stdio.h>
+
+#include <string.h>
+
+#include <openssl/buf.h>
+#include <openssl/err.h>
+#include <openssl/digest.h>
+#include <openssl/mem.h>
+#include <openssl/obj.h>
+#include <openssl/thread.h>
+#include <openssl/x509_vfy.h>
+#include <openssl/x509v3.h>
+
+#include "../internal.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);
+static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
+ int ca);
+static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
+ int ca);
+static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
+ int ca);
+static int purpose_smime(const X509 *x, int ca);
+static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
+ int ca);
+static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
+ int ca);
+static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
+ int ca);
+static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
+ int ca);
+static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca);
+static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca);
+
+static int xp_cmp(const X509_PURPOSE **a, const X509_PURPOSE **b);
+static void xptable_free(X509_PURPOSE *p);
+
+static X509_PURPOSE xstandard[] = {
+ {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0,
+ check_purpose_ssl_client, (char *)"SSL client", (char *)"sslclient",
+ NULL},
+ {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
+ check_purpose_ssl_server, (char *)"SSL server", (char *)"sslserver",
+ NULL},
+ {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
+ check_purpose_ns_ssl_server, (char *)"Netscape SSL server",
+ (char *)"nssslserver", NULL},
+ {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign,
+ (char *)"S/MIME signing", (char *)"smimesign", NULL},
+ {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0,
+ check_purpose_smime_encrypt, (char *)"S/MIME encryption",
+ (char *)"smimeencrypt", NULL},
+ {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign,
+ (char *)"CRL signing", (char *)"crlsign", NULL},
+ {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, (char *)"Any Purpose",
+ (char *)"any", NULL},
+ {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper,
+ (char *)"OCSP helper", (char *)"ocsphelper", NULL},
+ {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0,
+ check_purpose_timestamp_sign, (char *)"Time Stamp signing",
+ (char *)"timestampsign", NULL},
+};
+
+#define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE))
+
+static STACK_OF(X509_PURPOSE) *xptable = NULL;
+
+static int xp_cmp(const X509_PURPOSE **a, const X509_PURPOSE **b)
+{
+ return (*a)->purpose - (*b)->purpose;
+}
+
+/*
+ * As much as I'd like to make X509_check_purpose use a "const" X509* I
+ * really can't because it does recalculate hashes and do other non-const
+ * things.
+ */
+int X509_check_purpose(X509 *x, int id, int ca)
+{
+ int idx;
+ const X509_PURPOSE *pt;
+ x509v3_cache_extensions(x);
+ if (id == -1)
+ return 1;
+ idx = X509_PURPOSE_get_by_id(id);
+ if (idx == -1)
+ return -1;
+ pt = X509_PURPOSE_get0(idx);
+ return pt->check_purpose(pt, x, ca);
+}
+
+int X509_PURPOSE_set(int *p, int purpose)
+{
+ if (X509_PURPOSE_get_by_id(purpose) == -1) {
+ OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_PURPOSE);
+ return 0;
+ }
+ *p = purpose;
+ return 1;
+}
+
+int X509_PURPOSE_get_count(void)
+{
+ if (!xptable)
+ return X509_PURPOSE_COUNT;
+ return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT;
+}
+
+X509_PURPOSE *X509_PURPOSE_get0(int idx)
+{
+ if (idx < 0)
+ return NULL;
+ if (idx < (int)X509_PURPOSE_COUNT)
+ return xstandard + idx;
+ return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT);
+}
+
+int X509_PURPOSE_get_by_sname(char *sname)
+{
+ int i;
+ X509_PURPOSE *xptmp;
+ for (i = 0; i < X509_PURPOSE_get_count(); i++) {
+ xptmp = X509_PURPOSE_get0(i);
+ if (!strcmp(xptmp->sname, sname))
+ return i;
+ }
+ return -1;
+}
+
+int X509_PURPOSE_get_by_id(int purpose)
+{
+ X509_PURPOSE tmp;
+ size_t idx;
+
+ if ((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX))
+ return purpose - X509_PURPOSE_MIN;
+ tmp.purpose = purpose;
+ if (!xptable)
+ return -1;
+
+ if (!sk_X509_PURPOSE_find(xptable, &idx, &tmp))
+ return -1;
+ return idx + X509_PURPOSE_COUNT;
+}
+
+int X509_PURPOSE_add(int id, int trust, int flags,
+ int (*ck) (const X509_PURPOSE *, const X509 *, int),
+ char *name, char *sname, void *arg)
+{
+ int idx;
+ X509_PURPOSE *ptmp;
+ char *name_dup, *sname_dup;
+
+ /*
+ * This is set according to what we change: application can't set it
+ */
+ flags &= ~X509_PURPOSE_DYNAMIC;
+ /* This will always be set for application modified trust entries */
+ flags |= X509_PURPOSE_DYNAMIC_NAME;
+ /* Get existing entry if any */
+ idx = X509_PURPOSE_get_by_id(id);
+ /* Need a new entry */
+ if (idx == -1) {
+ if (!(ptmp = OPENSSL_malloc(sizeof(X509_PURPOSE)))) {
+ OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ ptmp->flags = X509_PURPOSE_DYNAMIC;
+ } else
+ ptmp = X509_PURPOSE_get0(idx);
+
+ /* Duplicate the supplied names. */
+ name_dup = BUF_strdup(name);
+ sname_dup = BUF_strdup(sname);
+ if (name_dup == NULL || sname_dup == NULL) {
+ OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
+ if (name_dup != NULL)
+ OPENSSL_free(name_dup);
+ if (sname_dup != NULL)
+ OPENSSL_free(sname_dup);
+ if (idx == -1)
+ OPENSSL_free(ptmp);
+ return 0;
+ }
+
+ /* OPENSSL_free existing name if dynamic */
+ if (ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) {
+ OPENSSL_free(ptmp->name);
+ OPENSSL_free(ptmp->sname);
+ }
+ /* dup supplied name */
+ ptmp->name = name_dup;
+ ptmp->sname = sname_dup;
+ /* Keep the dynamic flag of existing entry */
+ ptmp->flags &= X509_PURPOSE_DYNAMIC;
+ /* Set all other flags */
+ ptmp->flags |= flags;
+
+ ptmp->purpose = id;
+ ptmp->trust = trust;
+ ptmp->check_purpose = ck;
+ ptmp->usr_data = arg;
+
+ /* If its a new entry manage the dynamic table */
+ if (idx == -1) {
+ if (!xptable && !(xptable = sk_X509_PURPOSE_new(xp_cmp))) {
+ OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
+ xptable_free(ptmp);
+ return 0;
+ }
+ if (!sk_X509_PURPOSE_push(xptable, ptmp)) {
+ OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
+ xptable_free(ptmp);
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static void xptable_free(X509_PURPOSE *p)
+{
+ if (!p)
+ return;
+ if (p->flags & X509_PURPOSE_DYNAMIC) {
+ if (p->flags & X509_PURPOSE_DYNAMIC_NAME) {
+ OPENSSL_free(p->name);
+ OPENSSL_free(p->sname);
+ }
+ OPENSSL_free(p);
+ }
+}
+
+void X509_PURPOSE_cleanup(void)
+{
+ unsigned int i;
+ sk_X509_PURPOSE_pop_free(xptable, xptable_free);
+ for (i = 0; i < X509_PURPOSE_COUNT; i++)
+ xptable_free(xstandard + i);
+ xptable = NULL;
+}
+
+int X509_PURPOSE_get_id(X509_PURPOSE *xp)
+{
+ return xp->purpose;
+}
+
+char *X509_PURPOSE_get0_name(X509_PURPOSE *xp)
+{
+ return xp->name;
+}
+
+char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp)
+{
+ return xp->sname;
+}
+
+int X509_PURPOSE_get_trust(X509_PURPOSE *xp)
+{
+ return xp->trust;
+}
+
+static int nid_cmp(const void *void_a, const void *void_b)
+{
+ const int *a = void_a, *b = void_b;
+
+ return *a - *b;
+}
+
+int X509_supported_extension(X509_EXTENSION *ex)
+{
+ /*
+ * This table is a list of the NIDs of supported extensions: that is
+ * those which are used by the verify process. If an extension is
+ * critical and doesn't appear in this list then the verify process will
+ * normally reject the certificate. The list must be kept in numerical
+ * order because it will be searched using bsearch.
+ */
+
+ static const int supported_nids[] = {
+ NID_netscape_cert_type, /* 71 */
+ NID_key_usage, /* 83 */
+ NID_subject_alt_name, /* 85 */
+ NID_basic_constraints, /* 87 */
+ NID_certificate_policies, /* 89 */
+ NID_ext_key_usage, /* 126 */
+ NID_policy_constraints, /* 401 */
+ NID_proxyCertInfo, /* 663 */
+ NID_name_constraints, /* 666 */
+ NID_policy_mappings, /* 747 */
+ NID_inhibit_any_policy /* 748 */
+ };
+
+ int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
+
+ if (ex_nid == NID_undef)
+ return 0;
+
+ if (bsearch
+ (&ex_nid, supported_nids, sizeof(supported_nids) / sizeof(int),
+ sizeof(int), nid_cmp) != NULL)
+ return 1;
+ return 0;
+}
+
+static void setup_dp(X509 *x, DIST_POINT *dp)
+{
+ X509_NAME *iname = NULL;
+ size_t i;
+ if (dp->reasons) {
+ if (dp->reasons->length > 0)
+ dp->dp_reasons = dp->reasons->data[0];
+ if (dp->reasons->length > 1)
+ dp->dp_reasons |= (dp->reasons->data[1] << 8);
+ dp->dp_reasons &= CRLDP_ALL_REASONS;
+ } else
+ dp->dp_reasons = CRLDP_ALL_REASONS;
+ if (!dp->distpoint || (dp->distpoint->type != 1))
+ return;
+ for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) {
+ GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
+ if (gen->type == GEN_DIRNAME) {
+ iname = gen->d.directoryName;
+ break;
+ }
+ }
+ if (!iname)
+ iname = X509_get_issuer_name(x);
+
+ DIST_POINT_set_dpname(dp->distpoint, iname);
+
+}
+
+static void setup_crldp(X509 *x)
+{
+ size_t i;
+ x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL);
+ for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
+ setup_dp(x, sk_DIST_POINT_value(x->crldp, i));
+}
+
+static void x509v3_cache_extensions(X509 *x)
+{
+ BASIC_CONSTRAINTS *bs;
+ PROXY_CERT_INFO_EXTENSION *pci;
+ ASN1_BIT_STRING *usage;
+ ASN1_BIT_STRING *ns;
+ EXTENDED_KEY_USAGE *extusage;
+ X509_EXTENSION *ex;
+ size_t i;
+ int j;
+
+ CRYPTO_MUTEX_lock_read(&x->lock);
+ const int is_set = x->ex_flags & EXFLAG_SET;
+ CRYPTO_MUTEX_unlock_read(&x->lock);
+
+ if (is_set) {
+ return;
+ }
+
+ CRYPTO_MUTEX_lock_write(&x->lock);
+ if (x->ex_flags & EXFLAG_SET) {
+ CRYPTO_MUTEX_unlock_write(&x->lock);
+ return;
+ }
+
+ X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
+ /* 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)
+ x->ex_flags |= EXFLAG_CA;
+ if (bs->pathlen) {
+ if ((bs->pathlen->type == V_ASN1_NEG_INTEGER)
+ || !bs->ca) {
+ x->ex_flags |= EXFLAG_INVALID;
+ x->ex_pathlen = 0;
+ } else
+ x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen);
+ } else
+ x->ex_pathlen = -1;
+ 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
+ || X509_get_ext_by_NID(x, NID_subject_alt_name, -1) >= 0
+ || X509_get_ext_by_NID(x, NID_issuer_alt_name, -1) >= 0) {
+ x->ex_flags |= EXFLAG_INVALID;
+ }
+ if (pci->pcPathLengthConstraint) {
+ x->ex_pcpathlen = ASN1_INTEGER_get(pci->pcPathLengthConstraint);
+ } else
+ x->ex_pcpathlen = -1;
+ 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) {
+ x->ex_kusage = usage->data[0];
+ if (usage->length > 1)
+ x->ex_kusage |= usage->data[1] << 8;
+ } else
+ x->ex_kusage = 0;
+ x->ex_flags |= EXFLAG_KUSAGE;
+ ASN1_BIT_STRING_free(usage);
+ }
+ x->ex_xkusage = 0;
+ if ((extusage = X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) {
+ x->ex_flags |= EXFLAG_XKUSAGE;
+ for (i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) {
+ switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage, i))) {
+ case NID_server_auth:
+ x->ex_xkusage |= XKU_SSL_SERVER;
+ break;
+
+ case NID_client_auth:
+ x->ex_xkusage |= XKU_SSL_CLIENT;
+ break;
+
+ case NID_email_protect:
+ x->ex_xkusage |= XKU_SMIME;
+ break;
+
+ case NID_code_sign:
+ x->ex_xkusage |= XKU_CODE_SIGN;
+ break;
+
+ case NID_ms_sgc:
+ case NID_ns_sgc:
+ x->ex_xkusage |= XKU_SGC;
+ break;
+
+ case NID_OCSP_sign:
+ x->ex_xkusage |= XKU_OCSP_SIGN;
+ break;
+
+ case NID_time_stamp:
+ x->ex_xkusage |= XKU_TIMESTAMP;
+ break;
+
+ case NID_dvcs:
+ x->ex_xkusage |= XKU_DVCS;
+ break;
+
+ case NID_anyExtendedKeyUsage:
+ x->ex_xkusage |= XKU_ANYEKU;
+ break;
+ }
+ }
+ sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
+ }
+
+ if ((ns = X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) {
+ if (ns->length > 0)
+ x->ex_nscert = ns->data[0];
+ else
+ x->ex_nscert = 0;
+ x->ex_flags |= EXFLAG_NSCERT;
+ ASN1_BIT_STRING_free(ns);
+ }
+ 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, &j, NULL);
+ if (!x->nc && (j != -1))
+ x->ex_flags |= EXFLAG_INVALID;
+ setup_crldp(x);
+
+ for (j = 0; j < X509_get_ext_count(x); j++) {
+ ex = X509_get_ext(x, j);
+ if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
+ == NID_freshest_crl)
+ x->ex_flags |= EXFLAG_FRESHEST;
+ if (!X509_EXTENSION_get_critical(ex))
+ continue;
+ if (!X509_supported_extension(ex)) {
+ x->ex_flags |= EXFLAG_CRITICAL;
+ break;
+ }
+ }
+ x->ex_flags |= EXFLAG_SET;
+
+ CRYPTO_MUTEX_unlock_write(&x->lock);
+}
+
+/*
+ * CA checks common to all purposes return codes: 0 not a CA 1 is a CA 2
+ * basicConstraints absent so "maybe" a CA 3 basicConstraints absent but self
+ * signed V1. 4 basicConstraints absent but keyUsage present and keyCertSign
+ * asserted.
+ */
+
+static int check_ca(const X509 *x)
+{
+ /* keyUsage if present should allow cert signing */
+ if (ku_reject(x, KU_KEY_CERT_SIGN))
+ return 0;
+ if (x->ex_flags & EXFLAG_BCONS) {
+ if (x->ex_flags & EXFLAG_CA)
+ return 1;
+ /* If basicConstraints says not a CA then say so */
+ else
+ return 0;
+ } else {
+ /* we support V1 roots for... uh, I don't really know why. */
+ if ((x->ex_flags & V1_ROOT) == V1_ROOT)
+ return 3;
+ /*
+ * If key usage present it must have certSign so tolerate it
+ */
+ else if (x->ex_flags & EXFLAG_KUSAGE)
+ return 4;
+ /* Older certificates could have Netscape-specific CA types */
+ else if (x->ex_flags & EXFLAG_NSCERT && x->ex_nscert & NS_ANY_CA)
+ return 5;
+ /* can this still be regarded a CA certificate? I doubt it */
+ return 0;
+ }
+}
+
+int X509_check_ca(X509 *x)
+{
+ x509v3_cache_extensions(x);
+ return check_ca(x);
+}
+
+/* Check SSL CA: common checks for SSL client and server */
+static int check_ssl_ca(const X509 *x)
+{
+ int ca_ret;
+ ca_ret = check_ca(x);
+ if (!ca_ret)
+ return 0;
+ /* check nsCertType if present */
+ if (ca_ret != 5 || x->ex_nscert & NS_SSL_CA)
+ return ca_ret;
+ else
+ return 0;
+}
+
+static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
+ int ca)
+{
+ if (xku_reject(x, XKU_SSL_CLIENT))
+ return 0;
+ if (ca)
+ return check_ssl_ca(x);
+ /* We need to do digital signatures or key agreement */
+ if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_KEY_AGREEMENT))
+ return 0;
+ /* nsCertType if present should allow SSL client use */
+ if (ns_reject(x, NS_SSL_CLIENT))
+ return 0;
+ return 1;
+}
+
+/*
+ * Key usage needed for TLS/SSL server: digital signature, encipherment or
+ * key agreement. The ssl code can check this more thoroughly for individual
+ * key types.
+ */
+#define KU_TLS \
+ (KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT)
+
+static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
+ int ca)
+{
+ if (xku_reject(x, XKU_SSL_SERVER | XKU_SGC))
+ return 0;
+ if (ca)
+ return check_ssl_ca(x);
+
+ if (ns_reject(x, NS_SSL_SERVER))
+ return 0;
+ if (ku_reject(x, KU_TLS))
+ return 0;
+
+ return 1;
+
+}
+
+static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
+ int ca)
+{
+ int ret;
+ ret = check_purpose_ssl_server(xp, x, ca);
+ if (!ret || ca)
+ return ret;
+ /* We need to encipher or Netscape complains */
+ if (ku_reject(x, KU_KEY_ENCIPHERMENT))
+ return 0;
+ return ret;
+}
+
+/* common S/MIME checks */
+static int purpose_smime(const X509 *x, int ca)
+{
+ if (xku_reject(x, XKU_SMIME))
+ return 0;
+ if (ca) {
+ int ca_ret;
+ ca_ret = check_ca(x);
+ if (!ca_ret)
+ return 0;
+ /* check nsCertType if present */
+ if (ca_ret != 5 || x->ex_nscert & NS_SMIME_CA)
+ return ca_ret;
+ else
+ return 0;
+ }
+ if (x->ex_flags & EXFLAG_NSCERT) {
+ if (x->ex_nscert & NS_SMIME)
+ return 1;
+ /* Workaround for some buggy certificates */
+ if (x->ex_nscert & NS_SSL_CLIENT)
+ return 2;
+ return 0;
+ }
+ return 1;
+}
+
+static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
+ int ca)
+{
+ int ret;
+ ret = purpose_smime(x, ca);
+ if (!ret || ca)
+ return ret;
+ if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION))
+ return 0;
+ return ret;
+}
+
+static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
+ int ca)
+{
+ int ret;
+ ret = purpose_smime(x, ca);
+ if (!ret || ca)
+ return ret;
+ if (ku_reject(x, KU_KEY_ENCIPHERMENT))
+ return 0;
+ return ret;
+}
+
+static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
+ int ca)
+{
+ if (ca) {
+ int ca_ret;
+ if ((ca_ret = check_ca(x)) != 2)
+ return ca_ret;
+ else
+ return 0;
+ }
+ if (ku_reject(x, KU_CRL_SIGN))
+ return 0;
+ return 1;
+}
+
+/*
+ * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
+ * is valid. Additional checks must be made on the chain.
+ */
+
+static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca)
+{
+ /*
+ * Must be a valid CA. Should we really support the "I don't know" value
+ * (2)?
+ */
+ if (ca)
+ return check_ca(x);
+ /* leaf certificate is checked in OCSP_verify() */
+ return 1;
+}
+
+static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
+ int ca)
+{
+ int i_ext;
+
+ /* If ca is true we must return if this is a valid CA certificate. */
+ if (ca)
+ return check_ca(x);
+
+ /*
+ * Check the optional key usage field:
+ * if Key Usage is present, it must be one of digitalSignature
+ * and/or nonRepudiation (other values are not consistent and shall
+ * be rejected).
+ */
+ if ((x->ex_flags & EXFLAG_KUSAGE)
+ && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) ||
+ !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE))))
+ return 0;
+
+ /* Only time stamp key usage is permitted and it's required. */
+ if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP)
+ return 0;
+
+ /* Extended Key Usage MUST be critical */
+ i_ext = X509_get_ext_by_NID((X509 *)x, NID_ext_key_usage, -1);
+ if (i_ext >= 0) {
+ X509_EXTENSION *ext = X509_get_ext((X509 *)x, i_ext);
+ if (!X509_EXTENSION_get_critical(ext))
+ return 0;
+ }
+
+ return 1;
+}
+
+static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca)
+{
+ return 1;
+}
+
+/*
+ * Various checks to see if one certificate issued the second. This can be
+ * used to prune a set of possible issuer certificates which have been looked
+ * up using some simple method such as by subject name. These are: 1. Check
+ * issuer_name(subject) == subject_name(issuer) 2. If akid(subject) exists
+ * check it matches issuer 3. If key_usage(issuer) exists check it supports
+ * certificate signing returns 0 for OK, positive for reason for mismatch,
+ * reasons match codes for X509_verify_cert()
+ */
+
+int X509_check_issued(X509 *issuer, X509 *subject)
+{
+ if (X509_NAME_cmp(X509_get_subject_name(issuer),
+ X509_get_issuer_name(subject)))
+ return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
+ x509v3_cache_extensions(issuer);
+ x509v3_cache_extensions(subject);
+
+ if (subject->akid) {
+ int ret = X509_check_akid(issuer, subject->akid);
+ if (ret != X509_V_OK)
+ return ret;
+ }
+
+ if (subject->ex_flags & EXFLAG_PROXY) {
+ if (ku_reject(issuer, KU_DIGITAL_SIGNATURE))
+ return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE;
+ } else if (ku_reject(issuer, KU_KEY_CERT_SIGN))
+ return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
+ return X509_V_OK;
+}
+
+int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid)
+{
+
+ if (!akid)
+ return X509_V_OK;
+
+ /* Check key ids (if present) */
+ if (akid->keyid && issuer->skid &&
+ ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid))
+ return X509_V_ERR_AKID_SKID_MISMATCH;
+ /* Check serial number */
+ if (akid->serial &&
+ ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial))
+ return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
+ /* Check issuer name */
+ if (akid->issuer) {
+ /*
+ * Ugh, for some peculiar reason AKID includes SEQUENCE OF
+ * GeneralName. So look for a DirName. There may be more than one but
+ * we only take any notice of the first.
+ */
+ GENERAL_NAMES *gens;
+ GENERAL_NAME *gen;
+ X509_NAME *nm = NULL;
+ size_t i;
+ gens = akid->issuer;
+ for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
+ gen = sk_GENERAL_NAME_value(gens, i);
+ if (gen->type == GEN_DIRNAME) {
+ nm = gen->d.dirn;
+ break;
+ }
+ }
+ if (nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer)))
+ return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
+ }
+ return X509_V_OK;
+}
git://repos.xcallymotion.com / motion2.git / blobdiff