/* * Copyright 2020-2021 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 "e_os.h" #include #include #include #include #include #include #include #include #include #include "internal/provider.h" #include "internal/passphrase.h" #include "crypto/evp.h" #include "crypto/x509.h" #include "store_local.h" #ifndef OSSL_OBJECT_PKCS12 /* * The object abstraction doesn't know PKCS#12, but we want to indicate * it anyway, so we create our own. Since the public macros use positive * numbers, negative ones should be fine. They must never slip out from * this translation unit anyway. */ # define OSSL_OBJECT_PKCS12 -1 #endif /* * ossl_store_handle_load_result() is initially written to be a companion * to our 'file:' scheme provider implementation, but has been made generic * to serve others as well. * * This result handler takes any object abstraction (see provider-object(7)) * and does the best it can with it. If the object is passed by value (not * by reference), the contents are currently expected to be DER encoded. * If an object type is specified, that will be respected; otherwise, this * handler will guess the contents, by trying the following in order: * * 1. Decode it into an EVP_PKEY, using OSSL_DECODER. * 2. Decode it into an X.509 certificate, using d2i_X509 / d2i_X509_AUX. * 3. Decode it into an X.509 CRL, using d2i_X509_CRL. * 4. Decode it into a PKCS#12 structure, using d2i_PKCS12 (*). * * For the 'file:' scheme implementation, this is division of labor. Since * the libcrypto <-> provider interface currently doesn't support certain * structures as first class objects, they must be unpacked from DER here * rather than in the provider. The current exception is asymmetric keys, * which can reside within the provider boundary, most of all thanks to * OSSL_FUNC_keymgmt_load(), which allows loading the key material by * reference. */ struct extracted_param_data_st { int object_type; const char *data_type; const char *data_structure; const char *utf8_data; const void *octet_data; size_t octet_data_size; const void *ref; size_t ref_size; const char *desc; }; static int try_name(struct extracted_param_data_st *, OSSL_STORE_INFO **); static int try_key(struct extracted_param_data_st *, OSSL_STORE_INFO **, OSSL_STORE_CTX *, const OSSL_PROVIDER *, OSSL_LIB_CTX *, const char *); static int try_cert(struct extracted_param_data_st *, OSSL_STORE_INFO **, OSSL_LIB_CTX *, const char *); static int try_crl(struct extracted_param_data_st *, OSSL_STORE_INFO **, OSSL_LIB_CTX *, const char *); static int try_pkcs12(struct extracted_param_data_st *, OSSL_STORE_INFO **, OSSL_STORE_CTX *, OSSL_LIB_CTX *, const char *); int ossl_store_handle_load_result(const OSSL_PARAM params[], void *arg) { struct ossl_load_result_data_st *cbdata = arg; OSSL_STORE_INFO **v = &cbdata->v; OSSL_STORE_CTX *ctx = cbdata->ctx; const OSSL_PROVIDER *provider = OSSL_STORE_LOADER_get0_provider(ctx->fetched_loader); OSSL_LIB_CTX *libctx = ossl_provider_libctx(provider); const char *propq = ctx->properties; const OSSL_PARAM *p; struct extracted_param_data_st helper_data; memset(&helper_data, 0, sizeof(helper_data)); helper_data.object_type = OSSL_OBJECT_UNKNOWN; if ((p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_TYPE)) != NULL && !OSSL_PARAM_get_int(p, &helper_data.object_type)) return 0; p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_DATA_TYPE); if (p != NULL && !OSSL_PARAM_get_utf8_string_ptr(p, &helper_data.data_type)) return 0; p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_DATA); if (p != NULL && !OSSL_PARAM_get_octet_string_ptr(p, &helper_data.octet_data, &helper_data.octet_data_size) && !OSSL_PARAM_get_utf8_string_ptr(p, &helper_data.utf8_data)) return 0; p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_DATA_STRUCTURE); if (p != NULL && !OSSL_PARAM_get_utf8_string_ptr(p, &helper_data.data_structure)) return 0; p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_REFERENCE); if (p != NULL && !OSSL_PARAM_get_octet_string_ptr(p, &helper_data.ref, &helper_data.ref_size)) return 0; p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_DESC); if (p != NULL && !OSSL_PARAM_get_utf8_string_ptr(p, &helper_data.desc)) return 0; /* * The helper functions return 0 on actual errors, otherwise 1, even if * they didn't fill out |*v|. */ ERR_set_mark(); if (*v == NULL && !try_name(&helper_data, v)) goto err; ERR_pop_to_mark(); ERR_set_mark(); if (*v == NULL && !try_key(&helper_data, v, ctx, provider, libctx, propq)) goto err; ERR_pop_to_mark(); ERR_set_mark(); if (*v == NULL && !try_cert(&helper_data, v, libctx, propq)) goto err; ERR_pop_to_mark(); ERR_set_mark(); if (*v == NULL && !try_crl(&helper_data, v, libctx, propq)) goto err; ERR_pop_to_mark(); ERR_set_mark(); if (*v == NULL && !try_pkcs12(&helper_data, v, ctx, libctx, propq)) goto err; ERR_pop_to_mark(); if (*v == NULL) ERR_raise(ERR_LIB_OSSL_STORE, ERR_R_UNSUPPORTED); return (*v != NULL); err: ERR_clear_last_mark(); return 0; } static int try_name(struct extracted_param_data_st *data, OSSL_STORE_INFO **v) { if (data->object_type == OSSL_OBJECT_NAME) { char *newname = NULL, *newdesc = NULL; if (data->utf8_data == NULL) return 0; if ((newname = OPENSSL_strdup(data->utf8_data)) == NULL || (data->desc != NULL && (newdesc = OPENSSL_strdup(data->desc)) == NULL) || (*v = OSSL_STORE_INFO_new_NAME(newname)) == NULL) { OPENSSL_free(newname); OPENSSL_free(newdesc); return 0; } OSSL_STORE_INFO_set0_NAME_description(*v, newdesc); } return 1; } /* * For the rest of the object types, the provider code may not know what * type of data it gave us, so we may need to figure that out on our own. * Therefore, we do check for OSSL_OBJECT_UNKNOWN everywhere below, and * only return 0 on error if the object type is known. */ static EVP_PKEY *try_key_ref(struct extracted_param_data_st *data, OSSL_STORE_CTX *ctx, const OSSL_PROVIDER *provider, OSSL_LIB_CTX *libctx, const char *propq) { EVP_PKEY *pk = NULL; EVP_KEYMGMT *keymgmt = NULL; void *keydata = NULL; /* If we have an object reference, we must have a data type */ if (data->data_type == NULL) return 0; keymgmt = EVP_KEYMGMT_fetch(libctx, data->data_type, propq); if (keymgmt != NULL) { /* * There are two possible cases * * 1. The keymgmt is from the same provider as the loader, * so we can use evp_keymgmt_load() * 2. The keymgmt is from another provider, then we must * do the export/import dance. */ if (EVP_KEYMGMT_get0_provider(keymgmt) == provider) { keydata = evp_keymgmt_load(keymgmt, data->ref, data->ref_size); } else { struct evp_keymgmt_util_try_import_data_st import_data; OSSL_FUNC_store_export_object_fn *export_object = ctx->fetched_loader->p_export_object; import_data.keymgmt = keymgmt; import_data.keydata = NULL; import_data.selection = OSSL_KEYMGMT_SELECT_ALL; if (export_object != NULL) { /* * No need to check for errors here, the value of * |import_data.keydata| is as much an indicator. */ (void)export_object(ctx->loader_ctx, data->ref, data->ref_size, &evp_keymgmt_util_try_import, &import_data); } keydata = import_data.keydata; } } if (keydata != NULL) pk = evp_keymgmt_util_make_pkey(keymgmt, keydata); EVP_KEYMGMT_free(keymgmt); return pk; } static EVP_PKEY *try_key_value(struct extracted_param_data_st *data, OSSL_STORE_CTX *ctx, OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg, OSSL_LIB_CTX *libctx, const char *propq) { EVP_PKEY *pk = NULL; OSSL_DECODER_CTX *decoderctx = NULL; const unsigned char *pdata = data->octet_data; size_t pdatalen = data->octet_data_size; int selection = 0; switch (ctx->expected_type) { case 0: break; case OSSL_STORE_INFO_PARAMS: selection = OSSL_KEYMGMT_SELECT_ALL_PARAMETERS; break; case OSSL_STORE_INFO_PUBKEY: selection = OSSL_KEYMGMT_SELECT_PUBLIC_KEY | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS; break; case OSSL_STORE_INFO_PKEY: selection = OSSL_KEYMGMT_SELECT_ALL; break; default: return NULL; } decoderctx = OSSL_DECODER_CTX_new_for_pkey(&pk, NULL, data->data_structure, data->data_type, selection, libctx, propq); (void)OSSL_DECODER_CTX_set_passphrase_cb(decoderctx, cb, cbarg); /* No error if this couldn't be decoded */ (void)OSSL_DECODER_from_data(decoderctx, &pdata, &pdatalen); OSSL_DECODER_CTX_free(decoderctx); return pk; } typedef OSSL_STORE_INFO *store_info_new_fn(EVP_PKEY *); static EVP_PKEY *try_key_value_legacy(struct extracted_param_data_st *data, store_info_new_fn **store_info_new, OSSL_STORE_CTX *ctx, OSSL_PASSPHRASE_CALLBACK *cb, void *cbarg, OSSL_LIB_CTX *libctx, const char *propq) { EVP_PKEY *pk = NULL; const unsigned char *der = data->octet_data, *derp; long der_len = (long)data->octet_data_size; /* Try PUBKEY first, that's a real easy target */ if (ctx->expected_type == 0 || ctx->expected_type == OSSL_STORE_INFO_PUBKEY) { derp = der; pk = d2i_PUBKEY_ex(NULL, &derp, der_len, libctx, propq); if (pk != NULL) *store_info_new = OSSL_STORE_INFO_new_PUBKEY; } /* Try private keys next */ if (pk == NULL && (ctx->expected_type == 0 || ctx->expected_type == OSSL_STORE_INFO_PKEY)) { unsigned char *new_der = NULL; X509_SIG *p8 = NULL; PKCS8_PRIV_KEY_INFO *p8info = NULL; /* See if it's an encrypted PKCS#8 and decrypt it. */ derp = der; p8 = d2i_X509_SIG(NULL, &derp, der_len); if (p8 != NULL) { char pbuf[PEM_BUFSIZE]; size_t plen = 0; if (!cb(pbuf, sizeof(pbuf), &plen, NULL, cbarg)) { ERR_raise(ERR_LIB_OSSL_STORE, OSSL_STORE_R_BAD_PASSWORD_READ); } else { const X509_ALGOR *alg = NULL; const ASN1_OCTET_STRING *oct = NULL; int len = 0; X509_SIG_get0(p8, &alg, &oct); /* * No need to check the returned value, |new_der| * will be NULL on error anyway. */ PKCS12_pbe_crypt(alg, pbuf, plen, oct->data, oct->length, &new_der, &len, 0); der_len = len; der = new_der; } X509_SIG_free(p8); } /* * If the encrypted PKCS#8 couldn't be decrypted, * |der| is NULL */ if (der != NULL) { /* Try to unpack an unencrypted PKCS#8, that's easy */ derp = der; p8info = d2i_PKCS8_PRIV_KEY_INFO(NULL, &derp, der_len); if (p8info != NULL) { pk = EVP_PKCS82PKEY_ex(p8info, libctx, propq); PKCS8_PRIV_KEY_INFO_free(p8info); } } if (pk != NULL) *store_info_new = OSSL_STORE_INFO_new_PKEY; OPENSSL_free(new_der); } return pk; } static int try_key(struct extracted_param_data_st *data, OSSL_STORE_INFO **v, OSSL_STORE_CTX *ctx, const OSSL_PROVIDER *provider, OSSL_LIB_CTX *libctx, const char *propq) { store_info_new_fn *store_info_new = NULL; if (data->object_type == OSSL_OBJECT_UNKNOWN || data->object_type == OSSL_OBJECT_PKEY) { EVP_PKEY *pk = NULL; /* Prefer key by reference than key by value */ if (data->object_type == OSSL_OBJECT_PKEY && data->ref != NULL) { pk = try_key_ref(data, ctx, provider, libctx, propq); /* * If for some reason we couldn't get a key, it's an error. * It indicates that while decoders could make a key reference, * the keymgmt somehow couldn't handle it, or doesn't have a * OSSL_FUNC_keymgmt_load function. */ if (pk == NULL) return 0; } else if (data->octet_data != NULL) { OSSL_PASSPHRASE_CALLBACK *cb = ossl_pw_passphrase_callback_dec; void *cbarg = &ctx->pwdata; pk = try_key_value(data, ctx, cb, cbarg, libctx, propq); /* * Desperate last maneuver, in case the decoders don't support * the data we have, then we try on our own to at least get an * engine provided legacy key. * This is the same as der2key_decode() does, but in a limited * way and within the walls of libcrypto. */ if (pk == NULL) pk = try_key_value_legacy(data, &store_info_new, ctx, cb, cbarg, libctx, propq); } if (pk != NULL) { data->object_type = OSSL_OBJECT_PKEY; if (store_info_new == NULL) { /* * We determined the object type for OSSL_STORE_INFO, which * makes an explicit difference between an EVP_PKEY with just * (domain) parameters and an EVP_PKEY with actual key * material. * The logic is that an EVP_PKEY with actual key material * always has the public half. */ if (evp_keymgmt_util_has(pk, OSSL_KEYMGMT_SELECT_PRIVATE_KEY)) store_info_new = OSSL_STORE_INFO_new_PKEY; else if (evp_keymgmt_util_has(pk, OSSL_KEYMGMT_SELECT_PUBLIC_KEY)) store_info_new = OSSL_STORE_INFO_new_PUBKEY; else store_info_new = OSSL_STORE_INFO_new_PARAMS; } *v = store_info_new(pk); } if (*v == NULL) EVP_PKEY_free(pk); } return 1; } static int try_cert(struct extracted_param_data_st *data, OSSL_STORE_INFO **v, OSSL_LIB_CTX *libctx, const char *propq) { if (data->object_type == OSSL_OBJECT_UNKNOWN || data->object_type == OSSL_OBJECT_CERT) { /* * In most cases, we can try to interpret the serialized * data as a trusted cert (X509 + X509_AUX) and fall back * to reading it as a normal cert (just X509), but if * |data_type| (the PEM name) specifically declares it as a * trusted cert, then no fallback should be engaged. * |ignore_trusted| tells if the fallback can be used (1) * or not (0). */ int ignore_trusted = 1; X509 *cert = X509_new_ex(libctx, propq); if (cert == NULL) return 0; /* If we have a data type, it should be a PEM name */ if (data->data_type != NULL && (strcasecmp(data->data_type, PEM_STRING_X509_TRUSTED) == 0)) ignore_trusted = 0; if (d2i_X509_AUX(&cert, (const unsigned char **)&data->octet_data, data->octet_data_size) == NULL && (!ignore_trusted || d2i_X509(&cert, (const unsigned char **)&data->octet_data, data->octet_data_size) == NULL)) { X509_free(cert); cert = NULL; } if (cert != NULL) { /* We determined the object type */ data->object_type = OSSL_OBJECT_CERT; *v = OSSL_STORE_INFO_new_CERT(cert); if (*v == NULL) X509_free(cert); } } return 1; } static int try_crl(struct extracted_param_data_st *data, OSSL_STORE_INFO **v, OSSL_LIB_CTX *libctx, const char *propq) { if (data->object_type == OSSL_OBJECT_UNKNOWN || data->object_type == OSSL_OBJECT_CRL) { X509_CRL *crl; crl = d2i_X509_CRL(NULL, (const unsigned char **)&data->octet_data, data->octet_data_size); if (crl != NULL) /* We determined the object type */ data->object_type = OSSL_OBJECT_CRL; if (crl != NULL && !ossl_x509_crl_set0_libctx(crl, libctx, propq)) { X509_CRL_free(crl); crl = NULL; } if (crl != NULL) *v = OSSL_STORE_INFO_new_CRL(crl); if (*v == NULL) X509_CRL_free(crl); } return 1; } static int try_pkcs12(struct extracted_param_data_st *data, OSSL_STORE_INFO **v, OSSL_STORE_CTX *ctx, OSSL_LIB_CTX *libctx, const char *propq) { int ok = 1; /* There is no specific object type for PKCS12 */ if (data->object_type == OSSL_OBJECT_UNKNOWN) { /* Initial parsing */ PKCS12 *p12; p12 = d2i_PKCS12(NULL, (const unsigned char **)&data->octet_data, data->octet_data_size); if (p12 != NULL) { char *pass = NULL; char tpass[PEM_BUFSIZE]; size_t tpass_len; EVP_PKEY *pkey = NULL; X509 *cert = NULL; STACK_OF(X509) *chain = NULL; data->object_type = OSSL_OBJECT_PKCS12; ok = 0; /* Assume decryption or parse error */ if (PKCS12_verify_mac(p12, "", 0) || PKCS12_verify_mac(p12, NULL, 0)) { pass = ""; } else { static char prompt_info[] = "PKCS12 import pass phrase"; OSSL_PARAM pw_params[] = { OSSL_PARAM_utf8_string(OSSL_PASSPHRASE_PARAM_INFO, prompt_info, sizeof(prompt_info) - 1), OSSL_PARAM_END }; if (!ossl_pw_get_passphrase(tpass, sizeof(tpass), &tpass_len, pw_params, 0, &ctx->pwdata)) { ERR_raise(ERR_LIB_OSSL_STORE, OSSL_STORE_R_PASSPHRASE_CALLBACK_ERROR); goto p12_end; } pass = tpass; if (!PKCS12_verify_mac(p12, pass, strlen(pass))) { ERR_raise_data(ERR_LIB_OSSL_STORE, OSSL_STORE_R_ERROR_VERIFYING_PKCS12_MAC, strlen(pass) == 0 ? "empty password" : "maybe wrong password"); goto p12_end; } } if (PKCS12_parse(p12, pass, &pkey, &cert, &chain)) { STACK_OF(OSSL_STORE_INFO) *infos = NULL; OSSL_STORE_INFO *osi_pkey = NULL; OSSL_STORE_INFO *osi_cert = NULL; OSSL_STORE_INFO *osi_ca = NULL; ok = 1; /* Parsing went through correctly! */ if ((infos = sk_OSSL_STORE_INFO_new_null()) != NULL) { if (pkey != NULL) { if ((osi_pkey = OSSL_STORE_INFO_new_PKEY(pkey)) != NULL /* clearing pkey here avoids case distinctions */ && (pkey = NULL) == NULL && sk_OSSL_STORE_INFO_push(infos, osi_pkey) != 0) osi_pkey = NULL; else ok = 0; } if (ok && cert != NULL) { if ((osi_cert = OSSL_STORE_INFO_new_CERT(cert)) != NULL /* clearing cert here avoids case distinctions */ && (cert = NULL) == NULL && sk_OSSL_STORE_INFO_push(infos, osi_cert) != 0) osi_cert = NULL; else ok = 0; } while (ok && sk_X509_num(chain) > 0) { X509 *ca = sk_X509_value(chain, 0); if ((osi_ca = OSSL_STORE_INFO_new_CERT(ca)) != NULL && sk_X509_shift(chain) != NULL && sk_OSSL_STORE_INFO_push(infos, osi_ca) != 0) osi_ca = NULL; else ok = 0; } } EVP_PKEY_free(pkey); X509_free(cert); OSSL_STACK_OF_X509_free(chain); OSSL_STORE_INFO_free(osi_pkey); OSSL_STORE_INFO_free(osi_cert); OSSL_STORE_INFO_free(osi_ca); if (!ok) { sk_OSSL_STORE_INFO_pop_free(infos, OSSL_STORE_INFO_free); infos = NULL; } ctx->cached_info = infos; } } p12_end: PKCS12_free(p12); *v = sk_OSSL_STORE_INFO_shift(ctx->cached_info); } return ok; }