/*

 * Copyright 2019-2022 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 <stddef.h>

#include <openssl/types.h>

#include <openssl/evp.h>

#include <openssl/core.h>

#include "internal/cryptlib.h"

#include "internal/thread_once.h"

#include "internal/property.h"

#include "internal/core.h"

#include "internal/provider.h"

#include "internal/namemap.h"

#include "crypto/evp.h"    /* evp_local.h needs it */

#include "evp_local.h"

#define NAME_SEPARATOR ':'

/* Data to be passed through ossl_method_construct() */

struct evp_method_data_st {

    OSSL_LIB_CTX *libctx;

    int operation_id;            /* For get_evp_method_from_store() */

    int name_id;                 /* For get_evp_method_from_store() */

    const char *names;           /* For get_evp_method_from_store() */

    const char *propquery;       /* For get_evp_method_from_store() */

    OSSL_METHOD_STORE *tmp_store; /* For get_tmp_evp_method_store() */

    unsigned int flag_construct_error_occurred : 1;

    void *(*method_from_algorithm)(int name_id, const OSSL_ALGORITHM *,

                                   OSSL_PROVIDER *);

    int (*refcnt_up_method)(void *method);

    void (*destruct_method)(void *method);

};

/*

 * Generic routines to fetch / create EVP methods with ossl_method_construct()

 */

static void *get_tmp_evp_method_store(void *data)

{

    struct evp_method_data_st *methdata = data;

    if (methdata->tmp_store == NULL)

        methdata->tmp_store = ossl_method_store_new(methdata->libctx);

    return methdata->tmp_store;

}

 static void dealloc_tmp_evp_method_store(void *store)

{

    if (store != NULL)

        ossl_method_store_free(store);

}

static OSSL_METHOD_STORE *get_evp_method_store(OSSL_LIB_CTX *libctx)

{

    return ossl_lib_ctx_get_data(libctx, OSSL_LIB_CTX_EVP_METHOD_STORE_INDEX);

}

static int reserve_evp_method_store(void *store, void *data)

{

    struct evp_method_data_st *methdata = data;

    if (store == NULL

        && (store = get_evp_method_store(methdata->libctx)) == NULL)

        return 0;

    return ossl_method_lock_store(store);

}

static int unreserve_evp_method_store(void *store, void *data)

{

    struct evp_method_data_st *methdata = data;

    if (store == NULL

        && (store = get_evp_method_store(methdata->libctx)) == NULL)

        return 0;

    return ossl_method_unlock_store(store);

}

/*

 * To identify the method in the EVP method store, we mix the name identity

 * with the operation identity, under the assumption that we don't have more

 * than 2^23 names or more than 2^8 operation types.

 *

 * The resulting identity is a 31-bit integer, composed like this:

 *

 * +---------23 bits--------+-8 bits-+

 * |      name identity     | op id  |

 * +------------------------+--------+

 *

 * We limit this composite number to 31 bits, thus leaving the top uint32_t

 * bit always zero, to avoid negative sign extension when downshifting after

 * this number happens to be passed to an int (which happens as soon as it's

 * passed to ossl_method_store_cache_set(), and it's in that form that it

 * gets passed along to filter_on_operation_id(), defined further down.

 */

#define METHOD_ID_OPERATION_MASK        0x000000FF

#define METHOD_ID_OPERATION_MAX         ((1 << 8) - 1)

#define METHOD_ID_NAME_MASK             0x7FFFFF00

#define METHOD_ID_NAME_OFFSET           8

#define METHOD_ID_NAME_MAX              ((1 << 23) - 1)

static uint32_t evp_method_id(int name_id, unsigned int operation_id)

{

    if (!ossl_assert(name_id > 0 && name_id <= METHOD_ID_NAME_MAX)

        || !ossl_assert(operation_id > 0

                        && operation_id <= METHOD_ID_OPERATION_MAX))

        return 0;

    return (((name_id << METHOD_ID_NAME_OFFSET) & METHOD_ID_NAME_MASK)

            | (operation_id & METHOD_ID_OPERATION_MASK));

}

static void *get_evp_method_from_store(void *store, const OSSL_PROVIDER **prov,

                                       void *data)

{

    struct evp_method_data_st *methdata = data;

    void *method = NULL;

    int name_id;

    uint32_t meth_id;

    /*

     * get_evp_method_from_store() is only called to try and get the method

     * that evp_generic_fetch() is asking for, and the operation id as well

     * as the name or name id are passed via methdata.

     */

    if ((name_id = methdata->name_id) == 0 && methdata->names != NULL) {

        OSSL_NAMEMAP *namemap = ossl_namemap_stored(methdata->libctx);

        const char *names = methdata->names;

        const char *q = strchr(names, NAME_SEPARATOR);

        size_t l = (q == NULL ? strlen(names) : (size_t)(q - names));

        if (namemap == 0)

            return NULL;

        name_id = ossl_namemap_name2num_n(namemap, names, l);

    }

    if (name_id == 0

        || (meth_id = evp_method_id(name_id, methdata->operation_id)) == 0)

        return NULL;

    if (store == NULL

        && (store = get_evp_method_store(methdata->libctx)) == NULL)

        return NULL;

    if (!ossl_method_store_fetch(store, meth_id, methdata->propquery, prov,

                                 &method))

        return NULL;

    return method;

}

static int put_evp_method_in_store(void *store, void *method,

                                   const OSSL_PROVIDER *prov,

                                   const char *names, const char *propdef,

                                   void *data)

{

    struct evp_method_data_st *methdata = data;

    OSSL_NAMEMAP *namemap;

    int name_id;

    uint32_t meth_id;

    size_t l = 0;

    /*

     * put_evp_method_in_store() is only called with an EVP method that was

     * successfully created by construct_method() below, which means that

     * all the names should already be stored in the namemap with the same

     * numeric identity, so just use the first to get that identity.

     */

    if (names != NULL) {

        const char *q = strchr(names, NAME_SEPARATOR);

        l = (q == NULL ? strlen(names) : (size_t)(q - names));

    }

    if ((namemap = ossl_namemap_stored(methdata->libctx)) == NULL

        || (name_id = ossl_namemap_name2num_n(namemap, names, l)) == 0

        || (meth_id = evp_method_id(name_id, methdata->operation_id)) == 0)

        return 0;

    if (store == NULL

        && (store = get_evp_method_store(methdata->libctx)) == NULL)

        return 0;

    return ossl_method_store_add(store, prov, meth_id, propdef, method,

                                 methdata->refcnt_up_method,

                                 methdata->destruct_method);

}

/*

 * The core fetching functionality passes the name of the implementation.

 * This function is responsible to getting an identity number for it.

 */

static void *construct_evp_method(const OSSL_ALGORITHM *algodef,

                                  OSSL_PROVIDER *prov, void *data)

{

    /*

     * This function is only called if get_evp_method_from_store() returned

     * NULL, so it's safe to say that of all the spots to create a new

     * namemap entry, this is it.  Should the name already exist there, we

     * know that ossl_namemap_add_name() will return its corresponding

     * number.

     */

    struct evp_method_data_st *methdata = data;

    OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);

    OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

    const char *names = algodef->algorithm_names;

    int name_id = ossl_namemap_add_names(namemap, 0, names, NAME_SEPARATOR);

    void *method;

    if (name_id == 0)

        return NULL;

    method = methdata->method_from_algorithm(name_id, algodef, prov);

    /*

     * Flag to indicate that there was actual construction errors.  This

     * helps inner_evp_generic_fetch() determine what error it should

     * record on inaccessible algorithms.

     */

    if (method == NULL)

        methdata->flag_construct_error_occurred = 1;

    return method;

}

static void destruct_evp_method(void *method, void *data)

{

    struct evp_method_data_st *methdata = data;

    methdata->destruct_method(method);

}

static void *

inner_evp_generic_fetch(struct evp_method_data_st *methdata,

                        OSSL_PROVIDER *prov, int operation_id,

                        const char *name, const char *properties,

                        void *(*new_method)(int name_id,

                                            const OSSL_ALGORITHM *algodef,

                                            OSSL_PROVIDER *prov),

                        int (*up_ref_method)(void *),

                        void (*free_method)(void *))

{

    OSSL_METHOD_STORE *store = get_evp_method_store(methdata->libctx);

    OSSL_NAMEMAP *namemap = ossl_namemap_stored(methdata->libctx);

    const char *const propq = properties != NULL ? properties : "";

    uint32_t meth_id = 0;

    void *method = NULL;

    int unsupported, name_id;

    if (store == NULL || namemap == NULL) {

        ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_INVALID_ARGUMENT);

        return NULL;

    }

    /*

     * If there's ever an operation_id == 0 passed, we have an internal

     * programming error.

     */

    if (!ossl_assert(operation_id > 0)) {

        ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);

        return NULL;

    }

    /* If we haven't received a name id yet, try to get one for the name */

    name_id = name != NULL ? ossl_namemap_name2num(namemap, name) : 0;

    /*

     * If we have a name id, calculate a method id with evp_method_id().

     *

     * evp_method_id returns 0 if we have too many operations (more than

     * about 2^8) or too many names (more than about 2^24).  In that case,

     * we can't create any new method.

     * For all intents and purposes, this is an internal error.

     */

    if (name_id != 0 && (meth_id = evp_method_id(name_id, operation_id)) == 0) {

        ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);

        return NULL;

    }

    /*

     * If we haven't found the name yet, chances are that the algorithm to

     * be fetched is unsupported.

     */

    unsupported = name_id == 0;

    if (meth_id == 0

        || !ossl_method_store_cache_get(store, prov, meth_id, propq, &method)) {

        OSSL_METHOD_CONSTRUCT_METHOD mcm = {

            get_tmp_evp_method_store,

            reserve_evp_method_store,

            unreserve_evp_method_store,

            get_evp_method_from_store,

            put_evp_method_in_store,

            construct_evp_method,

            destruct_evp_method

        };

        methdata->operation_id = operation_id;

        methdata->name_id = name_id;

        methdata->names = name;

        methdata->propquery = propq;

        methdata->method_from_algorithm = new_method;

        methdata->refcnt_up_method = up_ref_method;

        methdata->destruct_method = free_method;

        methdata->flag_construct_error_occurred = 0;

        if ((method = ossl_method_construct(methdata->libctx, operation_id,

                                            &prov, 0 /* !force_cache */,

                                            &mcm, methdata)) != NULL) {

            /*

             * If construction did create a method for us, we know that

             * there is a correct name_id and meth_id, since those have

             * already been calculated in get_evp_method_from_store() and

             * put_evp_method_in_store() above.

             */

            if (name_id == 0)

                name_id = ossl_namemap_name2num(namemap, name);

            meth_id = evp_method_id(name_id, operation_id);

            if (name_id != 0)

                ossl_method_store_cache_set(store, prov, meth_id, propq,

                                            method, up_ref_method, free_method);

        }

        /*

         * If we never were in the constructor, the algorithm to be fetched

         * is unsupported.

         */

        unsupported = !methdata->flag_construct_error_occurred;

    }

    if ((name_id != 0 || name != NULL) && method == NULL) {

        int code = unsupported ? ERR_R_UNSUPPORTED : ERR_R_FETCH_FAILED;

        if (name == NULL)

            name = ossl_namemap_num2name(namemap, name_id, 0);

        ERR_raise_data(ERR_LIB_EVP, code,

                       "%s, Algorithm (%s : %d), Properties (%s)",

                       ossl_lib_ctx_get_descriptor(methdata->libctx),

                       name == NULL ? "<null>" : name, name_id,

                       properties == NULL ? "<null>" : properties);

    }

    return method;

}

void *evp_generic_fetch(OSSL_LIB_CTX *libctx, int operation_id,

                        const char *name, const char *properties,

                        void *(*new_method)(int name_id,

                                            const OSSL_ALGORITHM *algodef,

                                            OSSL_PROVIDER *prov),

                        int (*up_ref_method)(void *),

                        void (*free_method)(void *))

{

    struct evp_method_data_st methdata;

    void *method;

    methdata.libctx = libctx;

    methdata.tmp_store = NULL;

    method = inner_evp_generic_fetch(&methdata, NULL, operation_id,

                                     name, properties,

                                     new_method, up_ref_method, free_method);

    dealloc_tmp_evp_method_store(methdata.tmp_store);

    return method;

}

/*

 * evp_generic_fetch_from_prov() is special, and only returns methods from

 * the given provider.

 * This is meant to be used when one method needs to fetch an associated

 * method.

 */

void *evp_generic_fetch_from_prov(OSSL_PROVIDER *prov, int operation_id,

                                  const char *name, const char *properties,

                                  void *(*new_method)(int name_id,

                                                      const OSSL_ALGORITHM *algodef,

                                                      OSSL_PROVIDER *prov),

                                  int (*up_ref_method)(void *),

                                  void (*free_method)(void *))

{

    struct evp_method_data_st methdata;

    void *method;

    methdata.libctx = ossl_provider_libctx(prov);

    methdata.tmp_store = NULL;

    method = inner_evp_generic_fetch(&methdata, prov, operation_id,

                                     name, properties,

                                     new_method, up_ref_method, free_method);

    dealloc_tmp_evp_method_store(methdata.tmp_store);

    return method;

}

int evp_method_store_cache_flush(OSSL_LIB_CTX *libctx)

{

    OSSL_METHOD_STORE *store = get_evp_method_store(libctx);

    if (store != NULL)

        return ossl_method_store_cache_flush_all(store);

    return 1;

}

int evp_method_store_remove_all_provided(const OSSL_PROVIDER *prov)

{

    OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);

    OSSL_METHOD_STORE *store = get_evp_method_store(libctx);

    if (store != NULL)

        return ossl_method_store_remove_all_provided(store, prov);

    return 1;

}

static int evp_set_parsed_default_properties(OSSL_LIB_CTX *libctx,

                                             OSSL_PROPERTY_LIST *def_prop,

                                             int loadconfig,

                                             int mirrored)

{

    OSSL_METHOD_STORE *store = get_evp_method_store(libctx);

    OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx, loadconfig);

    if (plp != NULL && store != NULL) {

#ifndef FIPS_MODULE

        char *propstr = NULL;

        size_t strsz;

        if (mirrored) {

            if (ossl_global_properties_no_mirrored(libctx))

                return 0;

        } else {

            /*

             * These properties have been explicitly set on this libctx, so

             * don't allow any mirroring from a parent libctx.

             */

            ossl_global_properties_stop_mirroring(libctx);

        }

        strsz = ossl_property_list_to_string(libctx, def_prop, NULL, 0);

        if (strsz > 0)

            propstr = OPENSSL_malloc(strsz);

        if (propstr == NULL) {

            ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);

            return 0;

        }

        if (ossl_property_list_to_string(libctx, def_prop, propstr,

                                         strsz) == 0) {

            OPENSSL_free(propstr);

            ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);

            return 0;

        }

        ossl_provider_default_props_update(libctx, propstr);

        OPENSSL_free(propstr);

#endif

        ossl_property_free(*plp);

        *plp = def_prop;

        if (store != NULL)

            return ossl_method_store_cache_flush_all(store);

    }

    ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);

    return 0;

}

int evp_set_default_properties_int(OSSL_LIB_CTX *libctx, const char *propq,

                                   int loadconfig, int mirrored)

{

    OSSL_PROPERTY_LIST *pl = NULL;

    if (propq != NULL && (pl = ossl_parse_query(libctx, propq, 1)) == NULL) {

        ERR_raise(ERR_LIB_EVP, EVP_R_DEFAULT_QUERY_PARSE_ERROR);

        return 0;

    }

    if (!evp_set_parsed_default_properties(libctx, pl, loadconfig, mirrored)) {

        ossl_property_free(pl);

        return 0;

    }

    return 1;

}

int EVP_set_default_properties(OSSL_LIB_CTX *libctx, const char *propq)

{

    return evp_set_default_properties_int(libctx, propq, 1, 0);

}

static int evp_default_properties_merge(OSSL_LIB_CTX *libctx, const char *propq,

                                        int loadconfig)

{

    OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx, loadconfig);

    OSSL_PROPERTY_LIST *pl1, *pl2;

    if (propq == NULL)

        return 1;

    if (plp == NULL || *plp == NULL)

        return evp_set_default_properties_int(libctx, propq, 0, 0);

    if ((pl1 = ossl_parse_query(libctx, propq, 1)) == NULL) {

        ERR_raise(ERR_LIB_EVP, EVP_R_DEFAULT_QUERY_PARSE_ERROR);

        return 0;

    }

    pl2 = ossl_property_merge(pl1, *plp);

    ossl_property_free(pl1);

    if (pl2 == NULL) {

        ERR_raise(ERR_LIB_EVP, ERR_R_CRYPTO_LIB);

        return 0;

    }

    if (!evp_set_parsed_default_properties(libctx, pl2, 0, 0)) {

        ossl_property_free(pl2);

        return 0;

    }

    return 1;

}

static int evp_default_property_is_enabled(OSSL_LIB_CTX *libctx,

                                           const char *prop_name)

{

    OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx, 1);

    return plp != NULL && ossl_property_is_enabled(libctx, prop_name, *plp);

}

int EVP_default_properties_is_fips_enabled(OSSL_LIB_CTX *libctx)

{

    return evp_default_property_is_enabled(libctx, "fips");

}

int evp_default_properties_enable_fips_int(OSSL_LIB_CTX *libctx, int enable,

                                           int loadconfig)

{

    const char *query = (enable != 0) ? "fips=yes" : "-fips";

    return evp_default_properties_merge(libctx, query, loadconfig);

}

int EVP_default_properties_enable_fips(OSSL_LIB_CTX *libctx, int enable)

{

    return evp_default_properties_enable_fips_int(libctx, enable, 1);

}

char *evp_get_global_properties_str(OSSL_LIB_CTX *libctx, int loadconfig)

{

    OSSL_PROPERTY_LIST **plp = ossl_ctx_global_properties(libctx, loadconfig);

    char *propstr = NULL;

    size_t sz;

    if (plp == NULL)

        return OPENSSL_strdup("");

    sz = ossl_property_list_to_string(libctx, *plp, NULL, 0);

    if (sz == 0) {

        ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);

        return NULL;

    }

    propstr = OPENSSL_malloc(sz);

    if (propstr == NULL)

        return NULL;

    if (ossl_property_list_to_string(libctx, *plp, propstr, sz) == 0) {

        ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);

        OPENSSL_free(propstr);

        return NULL;

    }

    return propstr;

}

struct filter_data_st {

    int operation_id;

    void (*user_fn)(void *method, void *arg);

    void *user_arg;

};

static void filter_on_operation_id(int id, void *method, void *arg)

{

    struct filter_data_st *data = arg;

    if ((id & METHOD_ID_OPERATION_MASK) == data->operation_id)

        data->user_fn(method, data->user_arg);

}

void evp_generic_do_all(OSSL_LIB_CTX *libctx, int operation_id,

                        void (*user_fn)(void *method, void *arg),

                        void *user_arg,

                        void *(*new_method)(int name_id,

                                            const OSSL_ALGORITHM *algodef,

                                            OSSL_PROVIDER *prov),

                        int (*up_ref_method)(void *),

                        void (*free_method)(void *))

{

    struct evp_method_data_st methdata;

    struct filter_data_st data;

    methdata.libctx = libctx;

    methdata.tmp_store = NULL;

    (void)inner_evp_generic_fetch(&methdata, NULL, operation_id, NULL, NULL,

                                  new_method, up_ref_method, free_method);

    data.operation_id = operation_id;

    data.user_fn = user_fn;

    data.user_arg = user_arg;

    if (methdata.tmp_store != NULL)

        ossl_method_store_do_all(methdata.tmp_store, &filter_on_operation_id,

                                 &data);

    ossl_method_store_do_all(get_evp_method_store(libctx),

                             &filter_on_operation_id, &data);

    dealloc_tmp_evp_method_store(methdata.tmp_store);

}

int evp_is_a(OSSL_PROVIDER *prov, int number,

             const char *legacy_name, const char *name)

{

    /*

     * For a |prov| that is NULL, the library context will be NULL

     */

    OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);

    OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

    if (prov == NULL)

        number = ossl_namemap_name2num(namemap, legacy_name);

    return ossl_namemap_name2num(namemap, name) == number;

}

int evp_names_do_all(OSSL_PROVIDER *prov, int number,

                     void (*fn)(const char *name, void *data),

                     void *data)

{

    OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);

    OSSL_NAMEMAP *namemap = ossl_namemap_stored(libctx);

    return ossl_namemap_doall_names(namemap, number, fn, data);

}