diff options
Diffstat (limited to 'crypto/x509/x_crl.c')
| -rw-r--r-- | crypto/x509/x_crl.c | 466 |
1 files changed, 466 insertions, 0 deletions
diff --git a/crypto/x509/x_crl.c b/crypto/x509/x_crl.c new file mode 100644 index 000000000000..10733b58bca2 --- /dev/null +++ b/crypto/x509/x_crl.c @@ -0,0 +1,466 @@ +/* + * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (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 <stdio.h> +#include "internal/cryptlib.h" +#include <openssl/asn1t.h> +#include <openssl/x509.h> +#include "internal/x509_int.h" +#include <openssl/x509v3.h> +#include "x509_lcl.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_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; +} |