/* * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include "internal/cryptlib.h" #include #include #include "crypto/x509.h" #include #include "x509_local.h" static int X509_REVOKED_cmp(const X509_REVOKED *const *a, const X509_REVOKED *const *b); static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp); ASN1_SEQUENCE(X509_REVOKED) = { ASN1_EMBED(X509_REVOKED,serialNumber, ASN1_INTEGER), ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME), ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION) } ASN1_SEQUENCE_END(X509_REVOKED) static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r); static int def_crl_lookup(X509_CRL *crl, X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer); static X509_CRL_METHOD int_crl_meth = { 0, 0, 0, def_crl_lookup, def_crl_verify }; static const X509_CRL_METHOD *default_crl_method = &int_crl_meth; /* * The X509_CRL_INFO structure needs a bit of customisation. Since we cache * the original encoding the signature won't be affected by reordering of the * revoked field. */ static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg) { X509_CRL_INFO *a = (X509_CRL_INFO *)*pval; if (!a || !a->revoked) return 1; switch (operation) { /* * Just set cmp function here. We don't sort because that would * affect the output of X509_CRL_print(). */ case ASN1_OP_D2I_POST: (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp); break; } return 1; } ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = { ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER), ASN1_EMBED(X509_CRL_INFO, sig_alg, X509_ALGOR), ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME), ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME), ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME), ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED), ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0) } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO) /* * Set CRL entry issuer according to CRL certificate issuer extension. Check * for unhandled critical CRL entry extensions. */ static int crl_set_issuers(X509_CRL *crl) { int i, j; GENERAL_NAMES *gens, *gtmp; STACK_OF(X509_REVOKED) *revoked; revoked = X509_CRL_get_REVOKED(crl); gens = NULL; for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) { X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i); STACK_OF(X509_EXTENSION) *exts; ASN1_ENUMERATED *reason; X509_EXTENSION *ext; gtmp = X509_REVOKED_get_ext_d2i(rev, NID_certificate_issuer, &j, NULL); if (!gtmp && (j != -1)) { crl->flags |= EXFLAG_INVALID; return 1; } if (gtmp) { gens = gtmp; if (!crl->issuers) { crl->issuers = sk_GENERAL_NAMES_new_null(); if (!crl->issuers) return 0; } if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp)) return 0; } rev->issuer = gens; reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL); if (!reason && (j != -1)) { crl->flags |= EXFLAG_INVALID; return 1; } if (reason) { rev->reason = ASN1_ENUMERATED_get(reason); ASN1_ENUMERATED_free(reason); } else rev->reason = CRL_REASON_NONE; /* Check for critical CRL entry extensions */ exts = rev->extensions; for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) { ext = sk_X509_EXTENSION_value(exts, j); if (X509_EXTENSION_get_critical(ext)) { if (OBJ_obj2nid(X509_EXTENSION_get_object(ext)) == NID_certificate_issuer) continue; crl->flags |= EXFLAG_CRITICAL; break; } } } return 1; } /* * The X509_CRL structure needs a bit of customisation. Cache some extensions * and hash of the whole CRL. */ static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg) { X509_CRL *crl = (X509_CRL *)*pval; STACK_OF(X509_EXTENSION) *exts; X509_EXTENSION *ext; int idx; switch (operation) { case ASN1_OP_D2I_PRE: if (crl->meth->crl_free) { if (!crl->meth->crl_free(crl)) return 0; } AUTHORITY_KEYID_free(crl->akid); ISSUING_DIST_POINT_free(crl->idp); ASN1_INTEGER_free(crl->crl_number); ASN1_INTEGER_free(crl->base_crl_number); sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free); /* fall thru */ case ASN1_OP_NEW_POST: crl->idp = NULL; crl->akid = NULL; crl->flags = 0; crl->idp_flags = 0; crl->idp_reasons = CRLDP_ALL_REASONS; crl->meth = default_crl_method; crl->meth_data = NULL; crl->issuers = NULL; crl->crl_number = NULL; crl->base_crl_number = NULL; break; case ASN1_OP_D2I_POST: X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL); crl->idp = X509_CRL_get_ext_d2i(crl, NID_issuing_distribution_point, NULL, NULL); if (crl->idp) setup_idp(crl, crl->idp); crl->akid = X509_CRL_get_ext_d2i(crl, NID_authority_key_identifier, NULL, NULL); crl->crl_number = X509_CRL_get_ext_d2i(crl, NID_crl_number, NULL, NULL); crl->base_crl_number = X509_CRL_get_ext_d2i(crl, NID_delta_crl, NULL, NULL); /* Delta CRLs must have CRL number */ if (crl->base_crl_number && !crl->crl_number) crl->flags |= EXFLAG_INVALID; /* * See if we have any unhandled critical CRL extensions and indicate * this in a flag. We only currently handle IDP so anything else * critical sets the flag. This code accesses the X509_CRL structure * directly: applications shouldn't do this. */ exts = crl->crl.extensions; for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) { int nid; ext = sk_X509_EXTENSION_value(exts, idx); nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext)); if (nid == NID_freshest_crl) crl->flags |= EXFLAG_FRESHEST; if (X509_EXTENSION_get_critical(ext)) { /* We handle IDP and deltas */ if ((nid == NID_issuing_distribution_point) || (nid == NID_authority_key_identifier) || (nid == NID_delta_crl)) continue; crl->flags |= EXFLAG_CRITICAL; break; } } if (!crl_set_issuers(crl)) return 0; if (crl->meth->crl_init) { if (crl->meth->crl_init(crl) == 0) return 0; } crl->flags |= EXFLAG_SET; break; case ASN1_OP_FREE_POST: if (crl->meth->crl_free) { if (!crl->meth->crl_free(crl)) return 0; } AUTHORITY_KEYID_free(crl->akid); ISSUING_DIST_POINT_free(crl->idp); ASN1_INTEGER_free(crl->crl_number); ASN1_INTEGER_free(crl->base_crl_number); sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free); break; } return 1; } /* Convert IDP into a more convenient form */ static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp) { int idp_only = 0; /* Set various flags according to IDP */ crl->idp_flags |= IDP_PRESENT; if (idp->onlyuser > 0) { idp_only++; crl->idp_flags |= IDP_ONLYUSER; } if (idp->onlyCA > 0) { idp_only++; crl->idp_flags |= IDP_ONLYCA; } if (idp->onlyattr > 0) { idp_only++; crl->idp_flags |= IDP_ONLYATTR; } if (idp_only > 1) crl->idp_flags |= IDP_INVALID; if (idp->indirectCRL > 0) crl->idp_flags |= IDP_INDIRECT; if (idp->onlysomereasons) { crl->idp_flags |= IDP_REASONS; if (idp->onlysomereasons->length > 0) crl->idp_reasons = idp->onlysomereasons->data[0]; if (idp->onlysomereasons->length > 1) crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8); crl->idp_reasons &= CRLDP_ALL_REASONS; } DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl)); } ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = { ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO), ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR), ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING) } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL) IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED) IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED) IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO) IMPLEMENT_ASN1_FUNCTIONS(X509_CRL) IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL) static int X509_REVOKED_cmp(const X509_REVOKED *const *a, const X509_REVOKED *const *b) { return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber, (ASN1_STRING *)&(*b)->serialNumber)); } int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev) { X509_CRL_INFO *inf; inf = &crl->crl; if (inf->revoked == NULL) inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp); if (inf->revoked == NULL || !sk_X509_REVOKED_push(inf->revoked, rev)) { ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE); return 0; } inf->enc.modified = 1; return 1; } int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r) { if (crl->meth->crl_verify) return crl->meth->crl_verify(crl, r); return 0; } int X509_CRL_get0_by_serial(X509_CRL *crl, X509_REVOKED **ret, ASN1_INTEGER *serial) { if (crl->meth->crl_lookup) return crl->meth->crl_lookup(crl, ret, serial, NULL); return 0; } int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x) { if (crl->meth->crl_lookup) return crl->meth->crl_lookup(crl, ret, X509_get_serialNumber(x), X509_get_issuer_name(x)); return 0; } static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r) { return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO), &crl->sig_alg, &crl->signature, &crl->crl, r)); } static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm, X509_REVOKED *rev) { int i; if (!rev->issuer) { if (!nm) return 1; if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl))) return 1; return 0; } if (!nm) nm = X509_CRL_get_issuer(crl); for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) { GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i); if (gen->type != GEN_DIRNAME) continue; if (!X509_NAME_cmp(nm, gen->d.directoryName)) return 1; } return 0; } static int def_crl_lookup(X509_CRL *crl, X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer) { X509_REVOKED rtmp, *rev; int idx, num; if (crl->crl.revoked == NULL) return 0; /* * Sort revoked into serial number order if not already sorted. Do this * under a lock to avoid race condition. */ if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) { CRYPTO_THREAD_write_lock(crl->lock); sk_X509_REVOKED_sort(crl->crl.revoked); CRYPTO_THREAD_unlock(crl->lock); } rtmp.serialNumber = *serial; idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp); if (idx < 0) return 0; /* Need to look for matching name */ for (num = sk_X509_REVOKED_num(crl->crl.revoked); idx < num; idx++) { rev = sk_X509_REVOKED_value(crl->crl.revoked, idx); if (ASN1_INTEGER_cmp(&rev->serialNumber, serial)) return 0; if (crl_revoked_issuer_match(crl, issuer, rev)) { if (ret) *ret = rev; if (rev->reason == CRL_REASON_REMOVE_FROM_CRL) return 2; return 1; } } return 0; } void X509_CRL_set_default_method(const X509_CRL_METHOD *meth) { if (meth == NULL) default_crl_method = &int_crl_meth; else default_crl_method = meth; } X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl), int (*crl_free) (X509_CRL *crl), int (*crl_lookup) (X509_CRL *crl, X509_REVOKED **ret, ASN1_INTEGER *ser, X509_NAME *issuer), int (*crl_verify) (X509_CRL *crl, EVP_PKEY *pk)) { X509_CRL_METHOD *m = OPENSSL_malloc(sizeof(*m)); if (m == NULL) { X509err(X509_F_X509_CRL_METHOD_NEW, ERR_R_MALLOC_FAILURE); return NULL; } m->crl_init = crl_init; m->crl_free = crl_free; m->crl_lookup = crl_lookup; m->crl_verify = crl_verify; m->flags = X509_CRL_METHOD_DYNAMIC; return m; } void X509_CRL_METHOD_free(X509_CRL_METHOD *m) { if (m == NULL || !(m->flags & X509_CRL_METHOD_DYNAMIC)) return; OPENSSL_free(m); } void X509_CRL_set_meth_data(X509_CRL *crl, void *dat) { crl->meth_data = dat; } void *X509_CRL_get_meth_data(X509_CRL *crl) { return crl->meth_data; }