crypto/provider_child.c

   1 /*
   2  * Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <assert.h>
  11 #include <openssl/crypto.h>
  12 #include <openssl/core_dispatch.h>
  13 #include <openssl/core_names.h>
  14 #include <openssl/provider.h>
  15 #include <openssl/evp.h>
  16 #include "internal/provider.h"
  17 #include "internal/cryptlib.h"
  18 #include "crypto/evp.h"
  19 #include "crypto/context.h"
  20
  21 DEFINE_STACK_OF(OSSL_PROVIDER)
  22
  23 struct child_prov_globals {
  24     const OSSL_CORE_HANDLE *handle;
  25     const OSSL_CORE_HANDLE *curr_prov;
  26     CRYPTO_RWLOCK *lock;
  27     OSSL_FUNC_core_get_libctx_fn *c_get_libctx;
  28     OSSL_FUNC_provider_register_child_cb_fn *c_provider_register_child_cb;
  29     OSSL_FUNC_provider_deregister_child_cb_fn *c_provider_deregister_child_cb;
  30     OSSL_FUNC_provider_name_fn *c_prov_name;
  31     OSSL_FUNC_provider_get0_provider_ctx_fn *c_prov_get0_provider_ctx;
  32     OSSL_FUNC_provider_get0_dispatch_fn *c_prov_get0_dispatch;
  33     OSSL_FUNC_provider_up_ref_fn *c_prov_up_ref;
  34     OSSL_FUNC_provider_free_fn *c_prov_free;
  35 };
  36
  37 void *ossl_child_prov_ctx_new(OSSL_LIB_CTX *libctx)
  38 {
  39     return OPENSSL_zalloc(sizeof(struct child_prov_globals));
  40 }
  41
  42 void ossl_child_prov_ctx_free(void *vgbl)
  43 {
  44     struct child_prov_globals *gbl = vgbl;
  45
  46     CRYPTO_THREAD_lock_free(gbl->lock);
  47     OPENSSL_free(gbl);
  48 }
  49
  50 static OSSL_provider_init_fn ossl_child_provider_init;
  51
  52 static int ossl_child_provider_init(const OSSL_CORE_HANDLE *handle,
  53                                     const OSSL_DISPATCH *in,
  54                                     const OSSL_DISPATCH **out,
  55                                     void **provctx)
  56 {
  57     OSSL_FUNC_core_get_libctx_fn *c_get_libctx = NULL;
  58     OSSL_LIB_CTX *ctx;
  59     struct child_prov_globals *gbl;
  60
  61     for (; in->function_id != 0; in++) {
  62         switch (in->function_id) {
  63         case OSSL_FUNC_CORE_GET_LIBCTX:
  64             c_get_libctx = OSSL_FUNC_core_get_libctx(in);
  65             break;
  66         default:
  67             /* Just ignore anything we don't understand */
  68             break;
  69         }
  70     }
  71
  72     if (c_get_libctx == NULL)
  73         return 0;
  74
  75     /*
  76      * We need an OSSL_LIB_CTX but c_get_libctx returns OPENSSL_CORE_CTX. We are
  77      * a built-in provider and so we can get away with this cast. Normal
  78      * providers can't do this.
  79      */
  80     ctx = (OSSL_LIB_CTX *)c_get_libctx(handle);
  81
  82     gbl = ossl_lib_ctx_get_data(ctx, OSSL_LIB_CTX_CHILD_PROVIDER_INDEX);
  83     if (gbl == NULL)
  84         return 0;
  85
  86     *provctx = gbl->c_prov_get0_provider_ctx(gbl->curr_prov);
  87     *out = gbl->c_prov_get0_dispatch(gbl->curr_prov);
  88
  89     return 1;
  90 }
  91
  92 static int provider_create_child_cb(const OSSL_CORE_HANDLE *prov, void *cbdata)
  93 {
  94     OSSL_LIB_CTX *ctx = cbdata;
  95     struct child_prov_globals *gbl;
  96     const char *provname;
  97     OSSL_PROVIDER *cprov;
  98     int ret = 0;
  99
 100     gbl = ossl_lib_ctx_get_data(ctx, OSSL_LIB_CTX_CHILD_PROVIDER_INDEX);
 101     if (gbl == NULL)
 102         return 0;
 103
 104     if (!CRYPTO_THREAD_write_lock(gbl->lock))
 105         return 0;
 106
 107     provname = gbl->c_prov_name(prov);
 108
 109     /*
 110      * We're operating under a lock so we can store the "current" provider in
 111      * the global data.
 112      */
 113     gbl->curr_prov = prov;
 114
 115     if ((cprov = ossl_provider_find(ctx, provname, 1)) != NULL) {
 116         /*
 117          * We free the newly created ref. We rely on the provider sticking around
 118          * in the provider store.
 119          */
 120         ossl_provider_free(cprov);
 121
 122         /*
 123          * The provider already exists. It could be a previously created child,
 124          * or it could have been explicitly loaded. If explicitly loaded we
 125          * ignore it - i.e. we don't start treating it like a child.
 126          */
 127         if (!ossl_provider_activate(cprov, 0, 1))
 128             goto err;
 129     } else {
 130         /*
 131          * Create it - passing 1 as final param so we don't try and recursively
 132          * init children
 133          */
 134         if ((cprov = ossl_provider_new(ctx, provname, ossl_child_provider_init,
 135                                        1)) == NULL)
 136             goto err;
 137
 138         if (!ossl_provider_activate(cprov, 0, 0))
 139             goto err;
 140
 141         if (!ossl_provider_set_child(cprov, prov)
 142             || !ossl_provider_add_to_store(cprov, NULL, 0)) {
 143             ossl_provider_deactivate(cprov, 0);
 144             ossl_provider_free(cprov);
 145             goto err;
 146         }
 147     }
 148
 149     ret = 1;
 150  err:
 151     CRYPTO_THREAD_unlock(gbl->lock);
 152     return ret;
 153 }
 154
 155 static int provider_remove_child_cb(const OSSL_CORE_HANDLE *prov, void *cbdata)
 156 {
 157     OSSL_LIB_CTX *ctx = cbdata;
 158     struct child_prov_globals *gbl;
 159     const char *provname;
 160     OSSL_PROVIDER *cprov;
 161
 162     gbl = ossl_lib_ctx_get_data(ctx, OSSL_LIB_CTX_CHILD_PROVIDER_INDEX);
 163     if (gbl == NULL)
 164         return 0;
 165
 166     provname = gbl->c_prov_name(prov);
 167     cprov = ossl_provider_find(ctx, provname, 1);
 168     if (cprov == NULL)
 169         return 0;
 170     /*
 171      * ossl_provider_find ups the ref count, so we free it again here. We can
 172      * rely on the provider store reference count.
 173      */
 174     ossl_provider_free(cprov);
 175     if (ossl_provider_is_child(cprov)
 176             && !ossl_provider_deactivate(cprov, 1))
 177         return 0;
 178
 179     return 1;
 180 }
 181
 182 static int provider_global_props_cb(const char *props, void *cbdata)
 183 {
 184     OSSL_LIB_CTX *ctx = cbdata;
 185
 186     return evp_set_default_properties_int(ctx, props, 0, 1);
 187 }
 188
 189 int ossl_provider_init_as_child(OSSL_LIB_CTX *ctx,
 190                                 const OSSL_CORE_HANDLE *handle,
 191                                 const OSSL_DISPATCH *in)
 192 {
 193     struct child_prov_globals *gbl;
 194
 195     if (ctx == NULL)
 196         return 0;
 197
 198     gbl = ossl_lib_ctx_get_data(ctx, OSSL_LIB_CTX_CHILD_PROVIDER_INDEX);
 199     if (gbl == NULL)
 200         return 0;
 201
 202     gbl->handle = handle;
 203     for (; in->function_id != 0; in++) {
 204         switch (in->function_id) {
 205         case OSSL_FUNC_CORE_GET_LIBCTX:
 206             gbl->c_get_libctx = OSSL_FUNC_core_get_libctx(in);
 207             break;
 208         case OSSL_FUNC_PROVIDER_REGISTER_CHILD_CB:
 209             gbl->c_provider_register_child_cb
 210                 = OSSL_FUNC_provider_register_child_cb(in);
 211             break;
 212         case OSSL_FUNC_PROVIDER_DEREGISTER_CHILD_CB:
 213             gbl->c_provider_deregister_child_cb
 214                 = OSSL_FUNC_provider_deregister_child_cb(in);
 215             break;
 216         case OSSL_FUNC_PROVIDER_NAME:
 217             gbl->c_prov_name = OSSL_FUNC_provider_name(in);
 218             break;
 219         case OSSL_FUNC_PROVIDER_GET0_PROVIDER_CTX:
 220             gbl->c_prov_get0_provider_ctx
 221                 = OSSL_FUNC_provider_get0_provider_ctx(in);
 222             break;
 223         case OSSL_FUNC_PROVIDER_GET0_DISPATCH:
 224             gbl->c_prov_get0_dispatch = OSSL_FUNC_provider_get0_dispatch(in);
 225             break;
 226         case OSSL_FUNC_PROVIDER_UP_REF:
 227             gbl->c_prov_up_ref
 228                 = OSSL_FUNC_provider_up_ref(in);
 229             break;
 230         case OSSL_FUNC_PROVIDER_FREE:
 231             gbl->c_prov_free = OSSL_FUNC_provider_free(in);
 232             break;
 233         default:
 234             /* Just ignore anything we don't understand */
 235             break;
 236         }
 237     }
 238
 239     if (gbl->c_get_libctx == NULL
 240             || gbl->c_provider_register_child_cb == NULL
 241             || gbl->c_prov_name == NULL
 242             || gbl->c_prov_get0_provider_ctx == NULL
 243             || gbl->c_prov_get0_dispatch == NULL
 244             || gbl->c_prov_up_ref == NULL
 245             || gbl->c_prov_free == NULL)
 246         return 0;
 247
 248     gbl->lock = CRYPTO_THREAD_lock_new();
 249     if (gbl->lock == NULL)
 250         return 0;
 251
 252     if (!gbl->c_provider_register_child_cb(gbl->handle,
 253                                            provider_create_child_cb,
 254                                            provider_remove_child_cb,
 255                                            provider_global_props_cb,
 256                                            ctx))
 257         return 0;
 258
 259     return 1;
 260 }
 261
 262 void ossl_provider_deinit_child(OSSL_LIB_CTX *ctx)
 263 {
 264     struct child_prov_globals *gbl
 265         = ossl_lib_ctx_get_data(ctx, OSSL_LIB_CTX_CHILD_PROVIDER_INDEX);
 266     if (gbl == NULL)
 267         return;
 268
 269     gbl->c_provider_deregister_child_cb(gbl->handle);
 270 }
 271
 272 int ossl_provider_up_ref_parent(OSSL_PROVIDER *prov, int activate)
 273 {
 274     struct child_prov_globals *gbl;
 275
 276     gbl = ossl_lib_ctx_get_data(ossl_provider_libctx(prov),
 277                                 OSSL_LIB_CTX_CHILD_PROVIDER_INDEX);
 278     if (gbl == NULL)
 279         return 0;
 280
 281     return gbl->c_prov_up_ref(ossl_provider_get_parent(prov), activate);
 282 }
 283
 284 int ossl_provider_free_parent(OSSL_PROVIDER *prov, int deactivate)
 285 {
 286     struct child_prov_globals *gbl;
 287
 288     gbl = ossl_lib_ctx_get_data(ossl_provider_libctx(prov),
 289                                 OSSL_LIB_CTX_CHILD_PROVIDER_INDEX);
 290     if (gbl == NULL)
 291         return 0;
 292
 293     return gbl->c_prov_free(ossl_provider_get_parent(prov), deactivate);
 294 }