v3_asid.c

OpenSSL 0.9.8k 最新版OpenSSL

		X509V3_R_EXTENSION_VALUE_ERROR);
      goto done;
    }

    /*
     * Calculate a_max + 1 to check for adjacency.
     */
    if ((bn == NULL && (bn = BN_new()) == NULL) ||
	ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
	!BN_add_word(bn, 1) ||
	(a_max_plus_one = BN_to_ASN1_INTEGER(bn, a_max_plus_one)) == NULL) {
      X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE, ERR_R_MALLOC_FAILURE);
      goto done;
    }
    
    /*
     * If a and b are adjacent, merge them.
     */
    if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) == 0) {
      ASRange *r;
      switch (a->type) {
      case ASIdOrRange_id:
	if ((r = OPENSSL_malloc(sizeof(ASRange))) == NULL) {
	  X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,
		    ERR_R_MALLOC_FAILURE);
	  goto done;
	}
	r->min = a_min;
	r->max = b_max;
	a->type = ASIdOrRange_range;
	a->u.range = r;
	break;
      case ASIdOrRange_range:
	ASN1_INTEGER_free(a->u.range->max);
	a->u.range->max = b_max;
	break;
      }
      switch (b->type) {
      case ASIdOrRange_id:
	b->u.id = NULL;
	break;
      case ASIdOrRange_range:
	b->u.range->max = NULL;
	break;
      }
      ASIdOrRange_free(b);
      (void)sk_ASIdOrRange_delete(choice->u.asIdsOrRanges, i + 1);
      i--;
      continue;
    }
  }

  assert(ASIdentifierChoice_is_canonical(choice)); /* Paranoia */

  ret = 1;

 done:
  ASN1_INTEGER_free(a_max_plus_one);
  BN_free(bn);
  return ret;
}

/*
 * Whack an ASIdentifier extension into canonical form.
 */
int v3_asid_canonize(ASIdentifiers *asid)
{
  return (asid == NULL ||
	  (ASIdentifierChoice_canonize(asid->asnum) &&
	   ASIdentifierChoice_canonize(asid->rdi)));
}

/*
 * v2i method for an ASIdentifier extension.
 */
static void *v2i_ASIdentifiers(struct v3_ext_method *method,
			       struct v3_ext_ctx *ctx,
			       STACK_OF(CONF_VALUE) *values)
{
  ASIdentifiers *asid = NULL;
  int i;

  if ((asid = ASIdentifiers_new()) == NULL) {
    X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
    return NULL;
  }

  for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
    CONF_VALUE *val = sk_CONF_VALUE_value(values, i);
    ASN1_INTEGER *min = NULL, *max = NULL;
    int i1, i2, i3, is_range, which;

    /*
     * Figure out whether this is an AS or an RDI.
     */
    if (       !name_cmp(val->name, "AS")) {
      which = V3_ASID_ASNUM;
    } else if (!name_cmp(val->name, "RDI")) {
      which = V3_ASID_RDI;
    } else {
      X509V3err(X509V3_F_V2I_ASIDENTIFIERS, X509V3_R_EXTENSION_NAME_ERROR);
      X509V3_conf_err(val);
      goto err;
    }

    /*
     * Handle inheritance.
     */
    if (!strcmp(val->value, "inherit")) {
      if (v3_asid_add_inherit(asid, which))
	continue;
      X509V3err(X509V3_F_V2I_ASIDENTIFIERS, X509V3_R_INVALID_INHERITANCE);
      X509V3_conf_err(val);
      goto err;
    }

    /*
     * Number, range, or mistake, pick it apart and figure out which.
     */
    i1 = strspn(val->value, "0123456789");
    if (val->value[i1] == '\0') {
      is_range = 0;
    } else {
      is_range = 1;
      i2 = i1 + strspn(val->value + i1, " \t");
      if (val->value[i2] != '-') {
	X509V3err(X509V3_F_V2I_ASIDENTIFIERS, X509V3_R_INVALID_ASNUMBER);
	X509V3_conf_err(val);
	goto err;
      }
      i2++;
      i2 = i2 + strspn(val->value + i2, " \t");
      i3 = i2 + strspn(val->value + i2, "0123456789");
      if (val->value[i3] != '\0') {
	X509V3err(X509V3_F_V2I_ASIDENTIFIERS, X509V3_R_INVALID_ASRANGE);
	X509V3_conf_err(val);
	goto err;
      }
    }

    /*
     * Syntax is ok, read and add it.
     */
    if (!is_range) {
      if (!X509V3_get_value_int(val, &min)) {
	X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
	goto err;
      }
    } else {
      char *s = BUF_strdup(val->value);
      if (s == NULL) {
	X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
	goto err;
      }
      s[i1] = '\0';
      min = s2i_ASN1_INTEGER(NULL, s);
      max = s2i_ASN1_INTEGER(NULL, s + i2);
      OPENSSL_free(s);
      if (min == NULL || max == NULL) {
	ASN1_INTEGER_free(min);
	ASN1_INTEGER_free(max);
	X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
	goto err;
      }
    }
    if (!v3_asid_add_id_or_range(asid, which, min, max)) {
      ASN1_INTEGER_free(min);
      ASN1_INTEGER_free(max);
      X509V3err(X509V3_F_V2I_ASIDENTIFIERS, ERR_R_MALLOC_FAILURE);
      goto err;
    }
  }

  /*
   * Canonize the result, then we're done.
   */
  if (!v3_asid_canonize(asid))
    goto err;
  return asid;

 err:
  ASIdentifiers_free(asid);
  return NULL;
}

/*
 * OpenSSL dispatch.
 */
const X509V3_EXT_METHOD v3_asid = {
  NID_sbgp_autonomousSysNum,	/* nid */
  0,				/* flags */
  ASN1_ITEM_ref(ASIdentifiers),	/* template */
  0, 0, 0, 0,			/* old functions, ignored */
  0,				/* i2s */
  0,				/* s2i */
  0,				/* i2v */
  v2i_ASIdentifiers,		/* v2i */
  i2r_ASIdentifiers,		/* i2r */
  0,				/* r2i */
  NULL				/* extension-specific data */
};

/*
 * Figure out whether extension uses inheritance.
 */
int v3_asid_inherits(ASIdentifiers *asid)
{
  return (asid != NULL &&
	  ((asid->asnum != NULL &&
	    asid->asnum->type == ASIdentifierChoice_inherit) ||
	   (asid->rdi != NULL &&
	    asid->rdi->type == ASIdentifierChoice_inherit)));
}

/*
 * Figure out whether parent contains child.
 */
static int asid_contains(ASIdOrRanges *parent, ASIdOrRanges *child)
{
  ASN1_INTEGER *p_min, *p_max, *c_min, *c_max;
  int p, c;

  if (child == NULL || parent == child)
    return 1;
  if (parent == NULL)
    return 0;

  p = 0;
  for (c = 0; c < sk_ASIdOrRange_num(child); c++) {
    extract_min_max(sk_ASIdOrRange_value(child, c), &c_min, &c_max);
    for (;; p++) {
      if (p >= sk_ASIdOrRange_num(parent))
	return 0;
      extract_min_max(sk_ASIdOrRange_value(parent, p), &p_min, &p_max);
      if (ASN1_INTEGER_cmp(p_max, c_max) < 0)
	continue;
      if (ASN1_INTEGER_cmp(p_min, c_min) > 0)
	return 0;
      break;
    }
  }

  return 1;
}

/*
 * Test whether a is a subet of b.
 */
int v3_asid_subset(ASIdentifiers *a, ASIdentifiers *b)
{
  return (a == NULL ||
	  a == b ||
	  (b != NULL &&
	   !v3_asid_inherits(a) &&
	   !v3_asid_inherits(b) &&
	   asid_contains(b->asnum->u.asIdsOrRanges,
			 a->asnum->u.asIdsOrRanges) &&
	   asid_contains(b->rdi->u.asIdsOrRanges,
			 a->rdi->u.asIdsOrRanges)));
}

/*
 * Validation error handling via callback.
 */
#define validation_err(_err_)		\
  do {					\
    if (ctx != NULL) {			\
      ctx->error = _err_;		\
      ctx->error_depth = i;		\
      ctx->current_cert = x;		\
      ret = ctx->verify_cb(0, ctx);	\
    } else {				\
      ret = 0;				\
    }					\
    if (!ret)				\
      goto done;			\
  } while (0)

/*
 * Core code for RFC 3779 3.3 path validation.
 */
static int v3_asid_validate_path_internal(X509_STORE_CTX *ctx,
					  STACK_OF(X509) *chain,
					  ASIdentifiers *ext)
{
  ASIdOrRanges *child_as = NULL, *child_rdi = NULL;
  int i, ret = 1, inherit_as = 0, inherit_rdi = 0;
  X509 *x = NULL;

  assert(chain != NULL && sk_X509_num(chain) > 0);
  assert(ctx != NULL || ext != NULL);
  assert(ctx == NULL || ctx->verify_cb != NULL);

  /*
   * Figure out where to start.  If we don't have an extension to
   * check, we're done.  Otherwise, check canonical form and
   * set up for walking up the chain.
   */
  if (ext != NULL) {
    i = -1;
  } else {
    i = 0;
    x = sk_X509_value(chain, i);
    assert(x != NULL);
    if ((ext = x->rfc3779_asid) == NULL)
      goto done;
  }
  if (!v3_asid_is_canonical(ext))
    validation_err(X509_V_ERR_INVALID_EXTENSION);
  if (ext->asnum != NULL)  {
    switch (ext->asnum->type) {
    case ASIdentifierChoice_inherit:
      inherit_as = 1;
      break;
    case ASIdentifierChoice_asIdsOrRanges:
      child_as = ext->asnum->u.asIdsOrRanges;
      break;
    }
  }
  if (ext->rdi != NULL) {
    switch (ext->rdi->type) {
    case ASIdentifierChoice_inherit:
      inherit_rdi = 1;
      break;
    case ASIdentifierChoice_asIdsOrRanges:
      child_rdi = ext->rdi->u.asIdsOrRanges;
      break;
    }
  }

  /*
   * Now walk up the chain.  Extensions must be in canonical form, no
   * cert may list resources that its parent doesn't list.
   */
  for (i++; i < sk_X509_num(chain); i++) {
    x = sk_X509_value(chain, i);
    assert(x != NULL);
    if (x->rfc3779_asid == NULL) {
      if (child_as != NULL || child_rdi != NULL)
	validation_err(X509_V_ERR_UNNESTED_RESOURCE);
      continue;
    }
    if (!v3_asid_is_canonical(x->rfc3779_asid))
      validation_err(X509_V_ERR_INVALID_EXTENSION);
    if (x->rfc3779_asid->asnum == NULL && child_as != NULL) {
      validation_err(X509_V_ERR_UNNESTED_RESOURCE);
      child_as = NULL;
      inherit_as = 0;
    }
    if (x->rfc3779_asid->asnum != NULL &&
	x->rfc3779_asid->asnum->type == ASIdentifierChoice_asIdsOrRanges) {
      if (inherit_as ||
	  asid_contains(x->rfc3779_asid->asnum->u.asIdsOrRanges, child_as)) {
	child_as = x->rfc3779_asid->asnum->u.asIdsOrRanges;
	inherit_as = 0;
      } else {
	validation_err(X509_V_ERR_UNNESTED_RESOURCE);
      }
    }
    if (x->rfc3779_asid->rdi == NULL && child_rdi != NULL) {
      validation_err(X509_V_ERR_UNNESTED_RESOURCE);
      child_rdi = NULL;
      inherit_rdi = 0;
    }
    if (x->rfc3779_asid->rdi != NULL &&
	x->rfc3779_asid->rdi->type == ASIdentifierChoice_asIdsOrRanges) {
      if (inherit_rdi ||
	  asid_contains(x->rfc3779_asid->rdi->u.asIdsOrRanges, child_rdi)) {
	child_rdi = x->rfc3779_asid->rdi->u.asIdsOrRanges;
	inherit_rdi = 0;
      } else {
	validation_err(X509_V_ERR_UNNESTED_RESOURCE);
      }
    }
  }

  /*
   * Trust anchor can't inherit.
   */
  if (x->rfc3779_asid != NULL) {
    if (x->rfc3779_asid->asnum != NULL &&
	x->rfc3779_asid->asnum->type == ASIdentifierChoice_inherit)
      validation_err(X509_V_ERR_UNNESTED_RESOURCE);
    if (x->rfc3779_asid->rdi != NULL &&
	x->rfc3779_asid->rdi->type == ASIdentifierChoice_inherit)
      validation_err(X509_V_ERR_UNNESTED_RESOURCE);
  }

 done:
  return ret;
}

#undef validation_err

/*
 * RFC 3779 3.3 path validation -- called from X509_verify_cert().
 */
int v3_asid_validate_path(X509_STORE_CTX *ctx)
{
  return v3_asid_validate_path_internal(ctx, ctx->chain, NULL);
}

/*
 * RFC 3779 3.3 path validation of an extension.
 * Test whether chain covers extension.
 */
int v3_asid_validate_resource_set(STACK_OF(X509) *chain,
				  ASIdentifiers *ext,
				  int allow_inheritance)
{
  if (ext == NULL)
    return 1;
  if (chain == NULL || sk_X509_num(chain) == 0)
    return 0;
  if (!allow_inheritance && v3_asid_inherits(ext))
    return 0;
  return v3_asid_validate_path_internal(NULL, chain, ext);
}

#endif /* OPENSSL_NO_RFC3779 */