diff options
Diffstat (limited to 'openssl/crypto/x509v3/v3_asid.c')
| -rw-r--r-- | openssl/crypto/x509v3/v3_asid.c | 843 |
1 files changed, 843 insertions, 0 deletions
diff --git a/openssl/crypto/x509v3/v3_asid.c b/openssl/crypto/x509v3/v3_asid.c new file mode 100644 index 00000000..3f434c06 --- /dev/null +++ b/openssl/crypto/x509v3/v3_asid.c @@ -0,0 +1,843 @@ +/* + * Contributed to the OpenSSL Project by the American Registry for + * Internet Numbers ("ARIN"). + */ +/* ==================================================================== + * Copyright (c) 2006 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). + */ + +/* + * Implementation of RFC 3779 section 3.2. + */ + +#include <stdio.h> +#include <string.h> +#include "cryptlib.h" +#include <openssl/conf.h> +#include <openssl/asn1.h> +#include <openssl/asn1t.h> +#include <openssl/x509v3.h> +#include <openssl/x509.h> +#include <openssl/bn.h> + +#ifndef OPENSSL_NO_RFC3779 + +/* + * OpenSSL ASN.1 template translation of RFC 3779 3.2.3. + */ + +ASN1_SEQUENCE(ASRange) = { + ASN1_SIMPLE(ASRange, min, ASN1_INTEGER), + ASN1_SIMPLE(ASRange, max, ASN1_INTEGER) +} ASN1_SEQUENCE_END(ASRange) + +ASN1_CHOICE(ASIdOrRange) = { + ASN1_SIMPLE(ASIdOrRange, u.id, ASN1_INTEGER), + ASN1_SIMPLE(ASIdOrRange, u.range, ASRange) +} ASN1_CHOICE_END(ASIdOrRange) + +ASN1_CHOICE(ASIdentifierChoice) = { + ASN1_SIMPLE(ASIdentifierChoice, u.inherit, ASN1_NULL), + ASN1_SEQUENCE_OF(ASIdentifierChoice, u.asIdsOrRanges, ASIdOrRange) +} ASN1_CHOICE_END(ASIdentifierChoice) + +ASN1_SEQUENCE(ASIdentifiers) = { + ASN1_EXP_OPT(ASIdentifiers, asnum, ASIdentifierChoice, 0), + ASN1_EXP_OPT(ASIdentifiers, rdi, ASIdentifierChoice, 1) +} ASN1_SEQUENCE_END(ASIdentifiers) + +IMPLEMENT_ASN1_FUNCTIONS(ASRange) +IMPLEMENT_ASN1_FUNCTIONS(ASIdOrRange) +IMPLEMENT_ASN1_FUNCTIONS(ASIdentifierChoice) +IMPLEMENT_ASN1_FUNCTIONS(ASIdentifiers) + +/* + * i2r method for an ASIdentifierChoice. + */ +static int i2r_ASIdentifierChoice(BIO *out, + ASIdentifierChoice *choice, + int indent, + const char *msg) +{ + int i; + char *s; + if (choice == NULL) + return 1; + BIO_printf(out, "%*s%s:\n", indent, "", msg); + switch (choice->type) { + case ASIdentifierChoice_inherit: + BIO_printf(out, "%*sinherit\n", indent + 2, ""); + break; + case ASIdentifierChoice_asIdsOrRanges: + for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges); i++) { + ASIdOrRange *aor = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i); + switch (aor->type) { + case ASIdOrRange_id: + if ((s = i2s_ASN1_INTEGER(NULL, aor->u.id)) == NULL) + return 0; + BIO_printf(out, "%*s%s\n", indent + 2, "", s); + OPENSSL_free(s); + break; + case ASIdOrRange_range: + if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->min)) == NULL) + return 0; + BIO_printf(out, "%*s%s-", indent + 2, "", s); + OPENSSL_free(s); + if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->max)) == NULL) + return 0; + BIO_printf(out, "%s\n", s); + OPENSSL_free(s); + break; + default: + return 0; + } + } + break; + default: + return 0; + } + return 1; +} + +/* + * i2r method for an ASIdentifier extension. + */ +static int i2r_ASIdentifiers(const X509V3_EXT_METHOD *method, + void *ext, + BIO *out, + int indent) +{ + ASIdentifiers *asid = ext; + return (i2r_ASIdentifierChoice(out, asid->asnum, indent, + "Autonomous System Numbers") && + i2r_ASIdentifierChoice(out, asid->rdi, indent, + "Routing Domain Identifiers")); +} + +/* + * Sort comparision function for a sequence of ASIdOrRange elements. + */ +static int ASIdOrRange_cmp(const ASIdOrRange * const *a_, + const ASIdOrRange * const *b_) +{ + const ASIdOrRange *a = *a_, *b = *b_; + + OPENSSL_assert((a->type == ASIdOrRange_id && a->u.id != NULL) || + (a->type == ASIdOrRange_range && a->u.range != NULL && + a->u.range->min != NULL && a->u.range->max != NULL)); + + OPENSSL_assert((b->type == ASIdOrRange_id && b->u.id != NULL) || + (b->type == ASIdOrRange_range && b->u.range != NULL && + b->u.range->min != NULL && b->u.range->max != NULL)); + + if (a->type == ASIdOrRange_id && b->type == ASIdOrRange_id) + return ASN1_INTEGER_cmp(a->u.id, b->u.id); + + if (a->type == ASIdOrRange_range && b->type == ASIdOrRange_range) { + int r = ASN1_INTEGER_cmp(a->u.range->min, b->u.range->min); + return r != 0 ? r : ASN1_INTEGER_cmp(a->u.range->max, b->u.range->max); + } + + if (a->type == ASIdOrRange_id) + return ASN1_INTEGER_cmp(a->u.id, b->u.range->min); + else + return ASN1_INTEGER_cmp(a->u.range->min, b->u.id); +} + +/* + * Add an inherit element. + */ +int v3_asid_add_inherit(ASIdentifiers *asid, int which) +{ + ASIdentifierChoice **choice; + if (asid == NULL) + return 0; + switch (which) { + case V3_ASID_ASNUM: + choice = &asid->asnum; + break; + case V3_ASID_RDI: + choice = &asid->rdi; + break; + default: + return 0; + } + if (*choice == NULL) { + if ((*choice = ASIdentifierChoice_new()) == NULL) + return 0; + OPENSSL_assert((*choice)->u.inherit == NULL); + if (((*choice)->u.inherit = ASN1_NULL_new()) == NULL) + return 0; + (*choice)->type = ASIdentifierChoice_inherit; + } + return (*choice)->type == ASIdentifierChoice_inherit; +} + +/* + * Add an ID or range to an ASIdentifierChoice. + */ +int v3_asid_add_id_or_range(ASIdentifiers *asid, + int which, + ASN1_INTEGER *min, + ASN1_INTEGER *max) +{ + ASIdentifierChoice **choice; + ASIdOrRange *aor; + if (asid == NULL) + return 0; + switch (which) { + case V3_ASID_ASNUM: + choice = &asid->asnum; + break; + case V3_ASID_RDI: + choice = &asid->rdi; + break; + default: + return 0; + } + if (*choice != NULL && (*choice)->type == ASIdentifierChoice_inherit) + return 0; + if (*choice == NULL) { + if ((*choice = ASIdentifierChoice_new()) == NULL) + return 0; + OPENSSL_assert((*choice)->u.asIdsOrRanges == NULL); + (*choice)->u.asIdsOrRanges = sk_ASIdOrRange_new(ASIdOrRange_cmp); + if ((*choice)->u.asIdsOrRanges == NULL) + return 0; + (*choice)->type = ASIdentifierChoice_asIdsOrRanges; + } + if ((aor = ASIdOrRange_new()) == NULL) + return 0; + if (max == NULL) { + aor->type = ASIdOrRange_id; + aor->u.id = min; + } else { + aor->type = ASIdOrRange_range; + if ((aor->u.range = ASRange_new()) == NULL) + goto err; + ASN1_INTEGER_free(aor->u.range->min); + aor->u.range->min = min; + ASN1_INTEGER_free(aor->u.range->max); + aor->u.range->max = max; + } + if (!(sk_ASIdOrRange_push((*choice)->u.asIdsOrRanges, aor))) + goto err; + return 1; + + err: + ASIdOrRange_free(aor); + return 0; +} + +/* + * Extract min and max values from an ASIdOrRange. + */ +static void extract_min_max(ASIdOrRange *aor, + ASN1_INTEGER **min, + ASN1_INTEGER **max) +{ + OPENSSL_assert(aor != NULL && min != NULL && max != NULL); + switch (aor->type) { + case ASIdOrRange_id: + *min = aor->u.id; + *max = aor->u.id; + return; + case ASIdOrRange_range: + *min = aor->u.range->min; + *max = aor->u.range->max; + return; + } +} + +/* + * Check whether an ASIdentifierChoice is in canonical form. + */ +static int ASIdentifierChoice_is_canonical(ASIdentifierChoice *choice) +{ + ASN1_INTEGER *a_max_plus_one = NULL; + BIGNUM *bn = NULL; + int i, ret = 0; + + /* + * Empty element or inheritance is canonical. + */ + if (choice == NULL || choice->type == ASIdentifierChoice_inherit) + return 1; + + /* + * If not a list, or if empty list, it's broken. + */ + if (choice->type != ASIdentifierChoice_asIdsOrRanges || + sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0) + return 0; + + /* + * It's a list, check it. + */ + for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) { + ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i); + ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1); + ASN1_INTEGER *a_min, *a_max, *b_min, *b_max; + + extract_min_max(a, &a_min, &a_max); + extract_min_max(b, &b_min, &b_max); + + /* + * Punt misordered list, overlapping start, or inverted range. + */ + if (ASN1_INTEGER_cmp(a_min, b_min) >= 0 || + ASN1_INTEGER_cmp(a_min, a_max) > 0 || + ASN1_INTEGER_cmp(b_min, b_max) > 0) + 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_IS_CANONICAL, + ERR_R_MALLOC_FAILURE); + goto done; + } + + /* + * Punt if adjacent or overlapping. + */ + if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) >= 0) + goto done; + } + + ret = 1; + + done: + ASN1_INTEGER_free(a_max_plus_one); + BN_free(bn); + return ret; +} + +/* + * Check whether an ASIdentifier extension is in canonical form. + */ +int v3_asid_is_canonical(ASIdentifiers *asid) +{ + return (asid == NULL || + (ASIdentifierChoice_is_canonical(asid->asnum) && + ASIdentifierChoice_is_canonical(asid->rdi))); +} + +/* + * Whack an ASIdentifierChoice into canonical form. + */ +static int ASIdentifierChoice_canonize(ASIdentifierChoice *choice) +{ + ASN1_INTEGER *a_max_plus_one = NULL; + BIGNUM *bn = NULL; + int i, ret = 0; + + /* + * Nothing to do for empty element or inheritance. + */ + if (choice == NULL || choice->type == ASIdentifierChoice_inherit) + return 1; + + /* + * We have a list. Sort it. + */ + OPENSSL_assert(choice->type == ASIdentifierChoice_asIdsOrRanges); + sk_ASIdOrRange_sort(choice->u.asIdsOrRanges); + + /* + * Now check for errors and suboptimal encoding, rejecting the + * former and fixing the latter. + */ + for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) { + ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i); + ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1); + ASN1_INTEGER *a_min, *a_max, *b_min, *b_max; + + extract_min_max(a, &a_min, &a_max); + extract_min_max(b, &b_min, &b_max); + + /* + * Make sure we're properly sorted (paranoia). + */ + OPENSSL_assert(ASN1_INTEGER_cmp(a_min, b_min) <= 0); + + /* + * Check for overlaps. + */ + if (ASN1_INTEGER_cmp(a_max, b_min) >= 0) { + X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE, + 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); + sk_ASIdOrRange_delete(choice->u.asIdsOrRanges, i + 1); + i--; + continue; + } + } + + OPENSSL_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(const 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; + + OPENSSL_assert(chain != NULL && sk_X509_num(chain) > 0); + OPENSSL_assert(ctx != NULL || ext != NULL); + OPENSSL_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; + x = NULL; + } else { + i = 0; + x = sk_X509_value(chain, i); + OPENSSL_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); + OPENSSL_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. + */ + OPENSSL_assert(x != NULL); + 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 */ |