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 "cryptlib.h"
  62 #include <openssl/x509v3.h>
  63
  64 static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b);
  65 static void trtable_free(X509_TRUST *p);
  66
  67 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
  68 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);
  69 static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
  70
  71 static int obj_trust(int id, X509 *x, int flags);
  72 static int (*default_trust) (int id, X509 *x, int flags) = obj_trust;
  73
  74 /*
  75  * WARNING: the following table should be kept in order of trust and without
  76  * any gaps so we can just subtract the minimum trust value to get an index
  77  * into the table
  78  */
  79
  80 static X509_TRUST trstandard[] = {
  81     {X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL},
  82     {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth,
  83      NULL},
  84     {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth,
  85      NULL},
  86     {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect,
  87      NULL},
  88     {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign,
  89      NULL},
  90     {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign,
  91      NULL},
  92     {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP,
  93      NULL},
  94     {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL}
  95 };
  96
  97 #define X509_TRUST_COUNT        (sizeof(trstandard)/sizeof(X509_TRUST))
  98
  99 IMPLEMENT_STACK_OF(X509_TRUST)
 100
 101 static STACK_OF(X509_TRUST) *trtable = NULL;
 102
 103 static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b)
 104 {
 105     return (*a)->trust - (*b)->trust;
 106 }
 107
 108 int (*X509_TRUST_set_default(int (*trust) (int, X509 *, int))) (int, X509 *,
 109                                                                 int) {
 110     int (*oldtrust) (int, X509 *, int);
 111     oldtrust = default_trust;
 112     default_trust = trust;
 113     return oldtrust;
 114 }
 115
 116 int X509_check_trust(X509 *x, int id, int flags)
 117 {
 118     X509_TRUST *pt;
 119     int idx;
 120     if (id == -1)
 121         return 1;
 122     /* We get this as a default value */
 123     if (id == 0) {
 124         int rv;
 125         rv = obj_trust(NID_anyExtendedKeyUsage, x, 0);
 126         if (rv != X509_TRUST_UNTRUSTED)
 127             return rv;
 128         return trust_compat(NULL, x, 0);
 129     }
 130     idx = X509_TRUST_get_by_id(id);
 131     if (idx == -1)
 132         return default_trust(id, x, flags);
 133     pt = X509_TRUST_get0(idx);
 134     return pt->check_trust(pt, x, flags);
 135 }
 136
 137 int X509_TRUST_get_count(void)
 138 {
 139     if (!trtable)
 140         return X509_TRUST_COUNT;
 141     return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
 142 }
 143
 144 X509_TRUST *X509_TRUST_get0(int idx)
 145 {
 146     if (idx < 0)
 147         return NULL;
 148     if (idx < (int)X509_TRUST_COUNT)
 149         return trstandard + idx;
 150     return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
 151 }
 152
 153 int X509_TRUST_get_by_id(int id)
 154 {
 155     X509_TRUST tmp;
 156     int idx;
 157     if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
 158         return id - X509_TRUST_MIN;
 159     tmp.trust = id;
 160     if (!trtable)
 161         return -1;
 162     idx = sk_X509_TRUST_find(trtable, &tmp);
 163     if (idx == -1)
 164         return -1;
 165     return idx + X509_TRUST_COUNT;
 166 }
 167
 168 int X509_TRUST_set(int *t, int trust)
 169 {
 170     if (X509_TRUST_get_by_id(trust) == -1) {
 171         X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);
 172         return 0;
 173     }
 174     *t = trust;
 175     return 1;
 176 }
 177
 178 int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),
 179                    char *name, int arg1, void *arg2)
 180 {
 181     int idx;
 182     X509_TRUST *trtmp;
 183     /*
 184      * This is set according to what we change: application can't set it
 185      */
 186     flags &= ~X509_TRUST_DYNAMIC;
 187     /* This will always be set for application modified trust entries */
 188     flags |= X509_TRUST_DYNAMIC_NAME;
 189     /* Get existing entry if any */
 190     idx = X509_TRUST_get_by_id(id);
 191     /* Need a new entry */
 192     if (idx == -1) {
 193         if (!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) {
 194             X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
 195             return 0;
 196         }
 197         trtmp->flags = X509_TRUST_DYNAMIC;
 198     } else
 199         trtmp = X509_TRUST_get0(idx);
 200
 201     /* OPENSSL_free existing name if dynamic */
 202     if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)
 203         OPENSSL_free(trtmp->name);
 204     /* dup supplied name */
 205     if (!(trtmp->name = BUF_strdup(name))) {
 206         X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
 207         return 0;
 208     }
 209     /* Keep the dynamic flag of existing entry */
 210     trtmp->flags &= X509_TRUST_DYNAMIC;
 211     /* Set all other flags */
 212     trtmp->flags |= flags;
 213
 214     trtmp->trust = id;
 215     trtmp->check_trust = ck;
 216     trtmp->arg1 = arg1;
 217     trtmp->arg2 = arg2;
 218
 219     /* If its a new entry manage the dynamic table */
 220     if (idx == -1) {
 221         if (!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
 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 }