crypto/x509/x509_trs.c

   1 /* x509_trs.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 1999.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include "internal/cryptlib.h"
  62 #include <openssl/x509v3.h>
  63 #include "internal/x509_int.h"
  64
  65 static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b);
  66 static void trtable_free(X509_TRUST *p);
  67
  68 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
  69 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);
  70 static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
  71
  72 static int obj_trust(int id, X509 *x, int flags);
  73 static int (*default_trust) (int id, X509 *x, int flags) = obj_trust;
  74
  75 /*
  76  * WARNING: the following table should be kept in order of trust and without
  77  * any gaps so we can just subtract the minimum trust value to get an index
  78  * into the table
  79  */
  80
  81 static X509_TRUST trstandard[] = {
  82     {X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL},
  83     {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth,
  84      NULL},
  85     {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth,
  86      NULL},
  87     {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect,
  88      NULL},
  89     {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign,
  90      NULL},
  91     {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign,
  92      NULL},
  93     {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP,
  94      NULL},
  95     {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL}
  96 };
  97
  98 #define X509_TRUST_COUNT        OSSL_NELEM(trstandard)
  99
 100 static STACK_OF(X509_TRUST) *trtable = NULL;
 101
 102 static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b)
 103 {
 104     return (*a)->trust - (*b)->trust;
 105 }
 106
 107 int (*X509_TRUST_set_default(int (*trust) (int, X509 *, int))) (int, X509 *,
 108                                                                 int) {
 109     int (*oldtrust) (int, X509 *, int);
 110     oldtrust = default_trust;
 111     default_trust = trust;
 112     return oldtrust;
 113 }
 114
 115 int X509_check_trust(X509 *x, int id, int flags)
 116 {
 117     X509_TRUST *pt;
 118     int idx;
 119     if (id == -1)
 120         return 1;
 121     /* We get this as a default value */
 122     if (id == 0) {
 123         int rv;
 124         rv = obj_trust(NID_anyExtendedKeyUsage, x, 0);
 125         if (rv != X509_TRUST_UNTRUSTED)
 126             return rv;
 127         return trust_compat(NULL, x, 0);
 128     }
 129     idx = X509_TRUST_get_by_id(id);
 130     if (idx == -1)
 131         return default_trust(id, x, flags);
 132     pt = X509_TRUST_get0(idx);
 133     return pt->check_trust(pt, x, flags);
 134 }
 135
 136 int X509_TRUST_get_count(void)
 137 {
 138     if (!trtable)
 139         return X509_TRUST_COUNT;
 140     return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
 141 }
 142
 143 X509_TRUST *X509_TRUST_get0(int idx)
 144 {
 145     if (idx < 0)
 146         return NULL;
 147     if (idx < (int)X509_TRUST_COUNT)
 148         return trstandard + idx;
 149     return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
 150 }
 151
 152 int X509_TRUST_get_by_id(int id)
 153 {
 154     X509_TRUST tmp;
 155     int idx;
 156     if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
 157         return id - X509_TRUST_MIN;
 158     tmp.trust = id;
 159     if (!trtable)
 160         return -1;
 161     idx = sk_X509_TRUST_find(trtable, &tmp);
 162     if (idx == -1)
 163         return -1;
 164     return idx + X509_TRUST_COUNT;
 165 }
 166
 167 int X509_TRUST_set(int *t, int trust)
 168 {
 169     if (X509_TRUST_get_by_id(trust) == -1) {
 170         X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);
 171         return 0;
 172     }
 173     *t = trust;
 174     return 1;
 175 }
 176
 177 int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),
 178                    char *name, int arg1, void *arg2)
 179 {
 180     int idx;
 181     X509_TRUST *trtmp;
 182     /*
 183      * This is set according to what we change: application can't set it
 184      */
 185     flags &= ~X509_TRUST_DYNAMIC;
 186     /* This will always be set for application modified trust entries */
 187     flags |= X509_TRUST_DYNAMIC_NAME;
 188     /* Get existing entry if any */
 189     idx = X509_TRUST_get_by_id(id);
 190     /* Need a new entry */
 191     if (idx == -1) {
 192         if ((trtmp = OPENSSL_malloc(sizeof(*trtmp))) == NULL) {
 193             X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
 194             return 0;
 195         }
 196         trtmp->flags = X509_TRUST_DYNAMIC;
 197     } else
 198         trtmp = X509_TRUST_get0(idx);
 199
 200     /* OPENSSL_free existing name if dynamic */
 201     if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)
 202         OPENSSL_free(trtmp->name);
 203     /* dup supplied name */
 204     if ((trtmp->name = BUF_strdup(name)) == NULL) {
 205         X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
 206         return 0;
 207     }
 208     /* Keep the dynamic flag of existing entry */
 209     trtmp->flags &= X509_TRUST_DYNAMIC;
 210     /* Set all other flags */
 211     trtmp->flags |= flags;
 212
 213     trtmp->trust = id;
 214     trtmp->check_trust = ck;
 215     trtmp->arg1 = arg1;
 216     trtmp->arg2 = arg2;
 217
 218     /* If its a new entry manage the dynamic table */
 219     if (idx == -1) {
 220         if (trtable == NULL
 221             && (trtable = sk_X509_TRUST_new(tr_cmp)) == NULL) {
 222             X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
 223             return 0;
 224         }
 225         if (!sk_X509_TRUST_push(trtable, trtmp)) {
 226             X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
 227             return 0;
 228         }
 229     }
 230     return 1;
 231 }
 232
 233 static void trtable_free(X509_TRUST *p)
 234 {
 235     if (!p)
 236         return;
 237     if (p->flags & X509_TRUST_DYNAMIC) {
 238         if (p->flags & X509_TRUST_DYNAMIC_NAME)
 239             OPENSSL_free(p->name);
 240         OPENSSL_free(p);
 241     }
 242 }
 243
 244 void X509_TRUST_cleanup(void)
 245 {
 246     unsigned int i;
 247     for (i = 0; i < X509_TRUST_COUNT; i++)
 248         trtable_free(trstandard + i);
 249     sk_X509_TRUST_pop_free(trtable, trtable_free);
 250     trtable = NULL;
 251 }
 252
 253 int X509_TRUST_get_flags(X509_TRUST *xp)
 254 {
 255     return xp->flags;
 256 }
 257
 258 char *X509_TRUST_get0_name(X509_TRUST *xp)
 259 {
 260     return xp->name;
 261 }
 262
 263 int X509_TRUST_get_trust(X509_TRUST *xp)
 264 {
 265     return xp->trust;
 266 }
 267
 268 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
 269 {
 270     if (x->aux && (x->aux->trust || x->aux->reject))
 271         return obj_trust(trust->arg1, x, flags);
 272     /*
 273      * we don't have any trust settings: for compatibility we return trusted
 274      * if it is self signed
 275      */
 276     return trust_compat(trust, x, flags);
 277 }
 278
 279 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
 280 {
 281     if (x->aux)
 282         return obj_trust(trust->arg1, x, flags);
 283     return X509_TRUST_UNTRUSTED;
 284 }
 285
 286 static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
 287 {
 288     X509_check_purpose(x, -1, 0);
 289     if (x->ex_flags & EXFLAG_SS)
 290         return X509_TRUST_TRUSTED;
 291     else
 292         return X509_TRUST_UNTRUSTED;
 293 }
 294
 295 static int obj_trust(int id, X509 *x, int flags)
 296 {
 297     ASN1_OBJECT *obj;
 298     int i;
 299     X509_CERT_AUX *ax;
 300     ax = x->aux;
 301     if (!ax)
 302         return X509_TRUST_UNTRUSTED;
 303     if (ax->reject) {
 304         for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
 305             obj = sk_ASN1_OBJECT_value(ax->reject, i);
 306             if (OBJ_obj2nid(obj) == id)
 307                 return X509_TRUST_REJECTED;
 308         }
 309     }
 310     if (ax->trust) {
 311         for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
 312             obj = sk_ASN1_OBJECT_value(ax->trust, i);
 313             if (OBJ_obj2nid(obj) == id)
 314                 return X509_TRUST_TRUSTED;
 315         }
 316     }
 317     return X509_TRUST_UNTRUSTED;
 318 }