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openssl/crypto/x509v3/v3_purp.c

 /* 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:
@@ skipping 53 matching lines @@
 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 * const *a,
                 const X509_PURPOSE * const *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, "SSL client", "sslclient", NULL},
         {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ssl_server, "SSL server", "sslserver", NULL},
         {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0, check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL},
         {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign, "S/MIME signing", "smimesign", NULL},
         {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0, check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL},
         {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign, "CRL signing", "crlsign", NULL},
         {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any", NULL},
         {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper, "OCSP helper", "ocsphelper", NULL},
+        {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0, check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign", NULL},
 };
 
 #define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE))
 
 IMPLEMENT_STACK_OF(X509_PURPOSE)
 
 static STACK_OF(X509_PURPOSE) *xptable = NULL;
 
 static int xp_cmp(const X509_PURPOSE * const *a,
                 const X509_PURPOSE * const *b)
@@ skipping 158 matching lines @@
 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(int *a, int *b)
+static int nid_cmp(const int *a, const int *b)
         {
         return *a - *b;
         }
 
+DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid);
+IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid);
+
 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 int supported_nids[] = {
+        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 */
 #ifndef OPENSSL_NO_RFC3779
                 NID_sbgp_ipAddrBlock,   /* 290 */
                 NID_sbgp_autonomousSysNum, /* 291 */
 #endif
                 NID_policy_constraints, /* 401 */
-                NID_proxyCertInfo,      /* 661 */
+                NID_proxyCertInfo,      /* 663 */
+                NID_name_constraints,   /* 666 */
+                NID_policy_mappings,    /* 747 */
                 NID_inhibit_any_policy  /* 748 */
         };
 
-        int ex_nid;
-
-        ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
+        int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
 
         if (ex_nid == NID_undef) 
                 return 0;
 
-        if (OBJ_bsearch((char *)&ex_nid, (char *)supported_nids,
-                sizeof(supported_nids)/sizeof(int), sizeof(int),
-                (int (*)(const void *, const void *))nid_cmp))
+        if (OBJ_bsearch_nid(&ex_nid, supported_nids,
+                        sizeof(supported_nids)/sizeof(int)))
                 return 1;
         return 0;
         }
- 
+
+static void setup_dp(X509 *x, DIST_POINT *dp)
+        {
+        X509_NAME *iname = NULL;
+        int 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)
+        {
+        int 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;
         
@@ skipping 87 matching lines @@
         }
 
         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);
+        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))
+                x->ex_flags |= EXFLAG_INVALID;
+        setup_crldp(x);
+
 #ifndef OPENSSL_NO_RFC3779
-        x->rfc3779_addr =X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
-        x->rfc3779_asid =X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum,
-                                          NULL, NULL);
+        x->rfc3779_addr =X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
+        x->rfc3779_asid =X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum,
+                                          NULL, NULL);
 #endif
         for (i = 0; i < X509_get_ext_count(x); i++)
                 {
                 ex = X509_get_ext(x, i);
                 if (!X509_EXTENSION_get_critical(ex))
                         continue;
+                if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
+                                        == NID_freshest_crl)
+                        x->ex_flags |= EXFLAG_FRESHEST;
                 if (!X509_supported_extension(ex))
                         {
                         x->ex_flags |= EXFLAG_CRITICAL;
                         break;
                         }
                 }
         x->ex_flags |= EXFLAG_SET;
 }
 
 /* CA checks common to all purposes
@@ skipping 147 matching lines @@
 
 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, 0);
+        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) {
-                /* Check key ids (if present) */
-                if(subject->akid->keyid && issuer->skid &&
-                 ASN1_OCTET_STRING_cmp(subject->akid->keyid, issuer->skid) )
-                                return X509_V_ERR_AKID_SKID_MISMATCH;
-                /* Check serial number */
-                if(subject->akid->serial &&
-                        ASN1_INTEGER_cmp(X509_get_serialNumber(issuer),
-                                                subject->akid->serial))
-                                return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
-                /* Check issuer name */
-                if(subject->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;
-                        int i;
-                        gens = subject->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;
+
+        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;
+                int 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;
+        }
+