570 lines
20 KiB
C
570 lines
20 KiB
C
/* crypto/engine/eng_dyn.c */
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/*
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* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
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* 2001.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include "eng_int.h"
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#include <openssl/dso.h>
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/*
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* Shared libraries implementing ENGINEs for use by the "dynamic" ENGINE
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* loader should implement the hook-up functions with the following
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* prototypes.
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*/
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/* Our ENGINE handlers */
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static int dynamic_init(ENGINE *e);
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static int dynamic_finish(ENGINE *e);
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static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p,
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void (*f) (void));
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/* Predeclare our context type */
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typedef struct st_dynamic_data_ctx dynamic_data_ctx;
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/* The implementation for the important control command */
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static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx);
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#define DYNAMIC_CMD_SO_PATH ENGINE_CMD_BASE
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#define DYNAMIC_CMD_NO_VCHECK (ENGINE_CMD_BASE + 1)
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#define DYNAMIC_CMD_ID (ENGINE_CMD_BASE + 2)
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#define DYNAMIC_CMD_LIST_ADD (ENGINE_CMD_BASE + 3)
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#define DYNAMIC_CMD_DIR_LOAD (ENGINE_CMD_BASE + 4)
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#define DYNAMIC_CMD_DIR_ADD (ENGINE_CMD_BASE + 5)
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#define DYNAMIC_CMD_LOAD (ENGINE_CMD_BASE + 6)
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/* The constants used when creating the ENGINE */
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static const char *engine_dynamic_id = "dynamic";
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static const char *engine_dynamic_name = "Dynamic engine loading support";
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static const ENGINE_CMD_DEFN dynamic_cmd_defns[] = {
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{DYNAMIC_CMD_SO_PATH,
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"SO_PATH",
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"Specifies the path to the new ENGINE shared library",
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ENGINE_CMD_FLAG_STRING},
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{DYNAMIC_CMD_NO_VCHECK,
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"NO_VCHECK",
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"Specifies to continue even if version checking fails (boolean)",
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ENGINE_CMD_FLAG_NUMERIC},
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{DYNAMIC_CMD_ID,
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"ID",
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"Specifies an ENGINE id name for loading",
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ENGINE_CMD_FLAG_STRING},
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{DYNAMIC_CMD_LIST_ADD,
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"LIST_ADD",
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"Whether to add a loaded ENGINE to the internal list (0=no,1=yes,2=mandatory)",
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ENGINE_CMD_FLAG_NUMERIC},
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{DYNAMIC_CMD_DIR_LOAD,
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"DIR_LOAD",
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"Specifies whether to load from 'DIR_ADD' directories (0=no,1=yes,2=mandatory)",
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ENGINE_CMD_FLAG_NUMERIC},
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{DYNAMIC_CMD_DIR_ADD,
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"DIR_ADD",
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"Adds a directory from which ENGINEs can be loaded",
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ENGINE_CMD_FLAG_STRING},
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{DYNAMIC_CMD_LOAD,
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"LOAD",
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"Load up the ENGINE specified by other settings",
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ENGINE_CMD_FLAG_NO_INPUT},
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{0, NULL, NULL, 0}
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};
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/*
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* Loading code stores state inside the ENGINE structure via the "ex_data"
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* element. We load all our state into a single structure and use that as a
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* single context in the "ex_data" stack.
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*/
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struct st_dynamic_data_ctx {
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/* The DSO object we load that supplies the ENGINE code */
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DSO *dynamic_dso;
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/*
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* The function pointer to the version checking shared library function
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*/
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dynamic_v_check_fn v_check;
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/*
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* The function pointer to the engine-binding shared library function
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*/
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dynamic_bind_engine bind_engine;
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/* The default name/path for loading the shared library */
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const char *DYNAMIC_LIBNAME;
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/* Whether to continue loading on a version check failure */
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int no_vcheck;
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/* If non-NULL, stipulates the 'id' of the ENGINE to be loaded */
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const char *engine_id;
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/*
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* If non-zero, a successfully loaded ENGINE should be added to the
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* internal ENGINE list. If 2, the add must succeed or the entire load
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* should fail.
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*/
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int list_add_value;
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/* The symbol name for the version checking function */
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const char *DYNAMIC_F1;
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/* The symbol name for the "initialise ENGINE structure" function */
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const char *DYNAMIC_F2;
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/*
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* Whether to never use 'dirs', use 'dirs' as a fallback, or only use
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* 'dirs' for loading. Default is to use 'dirs' as a fallback.
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*/
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int dir_load;
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/* A stack of directories from which ENGINEs could be loaded */
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STACK_OF(OPENSSL_STRING) *dirs;
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};
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/*
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* This is the "ex_data" index we obtain and reserve for use with our context
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* structure.
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*/
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static int dynamic_ex_data_idx = -1;
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static void int_free_str(char *s)
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{
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OPENSSL_free(s);
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}
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/*
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* Because our ex_data element may or may not get allocated depending on
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* whether a "first-use" occurs before the ENGINE is freed, we have a memory
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* leak problem to solve. We can't declare a "new" handler for the ex_data as
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* we don't want a dynamic_data_ctx in *all* ENGINE structures of all types
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* (this is a bug in the design of CRYPTO_EX_DATA). As such, we just declare
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* a "free" handler and that will get called if an ENGINE is being destroyed
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* and there was an ex_data element corresponding to our context type.
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*/
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static void dynamic_data_ctx_free_func(void *parent, void *ptr,
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CRYPTO_EX_DATA *ad, int idx, long argl,
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void *argp)
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{
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if (ptr) {
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dynamic_data_ctx *ctx = (dynamic_data_ctx *)ptr;
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if (ctx->dynamic_dso)
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DSO_free(ctx->dynamic_dso);
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if (ctx->DYNAMIC_LIBNAME)
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OPENSSL_free((void *)ctx->DYNAMIC_LIBNAME);
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if (ctx->engine_id)
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OPENSSL_free((void *)ctx->engine_id);
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if (ctx->dirs)
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sk_OPENSSL_STRING_pop_free(ctx->dirs, int_free_str);
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OPENSSL_free(ctx);
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}
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}
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/*
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* Construct the per-ENGINE context. We create it blindly and then use a lock
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* to check for a race - if so, all but one of the threads "racing" will have
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* wasted their time. The alternative involves creating everything inside the
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* lock which is far worse.
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*/
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static int dynamic_set_data_ctx(ENGINE *e, dynamic_data_ctx **ctx)
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{
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dynamic_data_ctx *c;
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c = OPENSSL_malloc(sizeof(dynamic_data_ctx));
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if (!c) {
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ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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memset(c, 0, sizeof(dynamic_data_ctx));
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c->dynamic_dso = NULL;
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c->v_check = NULL;
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c->bind_engine = NULL;
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c->DYNAMIC_LIBNAME = NULL;
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c->no_vcheck = 0;
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c->engine_id = NULL;
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c->list_add_value = 0;
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c->DYNAMIC_F1 = "v_check";
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c->DYNAMIC_F2 = "bind_engine";
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c->dir_load = 1;
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c->dirs = sk_OPENSSL_STRING_new_null();
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if (!c->dirs) {
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ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE);
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OPENSSL_free(c);
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return 0;
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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if ((*ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e,
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dynamic_ex_data_idx))
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== NULL) {
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/* Good, we're the first */
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ENGINE_set_ex_data(e, dynamic_ex_data_idx, c);
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*ctx = c;
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c = NULL;
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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/*
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* If we lost the race to set the context, c is non-NULL and *ctx is the
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* context of the thread that won.
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*/
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if (c) {
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sk_OPENSSL_STRING_free(c->dirs);
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OPENSSL_free(c);
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}
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return 1;
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}
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/*
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* This function retrieves the context structure from an ENGINE's "ex_data",
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* or if it doesn't exist yet, sets it up.
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*/
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static dynamic_data_ctx *dynamic_get_data_ctx(ENGINE *e)
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{
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dynamic_data_ctx *ctx;
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if (dynamic_ex_data_idx < 0) {
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/*
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* Create and register the ENGINE ex_data, and associate our "free"
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* function with it to ensure any allocated contexts get freed when
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* an ENGINE goes underground.
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*/
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int new_idx = ENGINE_get_ex_new_index(0, NULL, NULL, NULL,
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dynamic_data_ctx_free_func);
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if (new_idx == -1) {
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ENGINEerr(ENGINE_F_DYNAMIC_GET_DATA_CTX, ENGINE_R_NO_INDEX);
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return NULL;
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}
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CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
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/* Avoid a race by checking again inside this lock */
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if (dynamic_ex_data_idx < 0) {
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/* Good, someone didn't beat us to it */
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dynamic_ex_data_idx = new_idx;
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new_idx = -1;
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
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/*
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* In theory we could "give back" the index here if (new_idx>-1), but
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* it's not possible and wouldn't gain us much if it were.
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*/
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}
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ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, dynamic_ex_data_idx);
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/* Check if the context needs to be created */
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if ((ctx == NULL) && !dynamic_set_data_ctx(e, &ctx))
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/* "set_data" will set errors if necessary */
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return NULL;
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return ctx;
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}
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static ENGINE *engine_dynamic(void)
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{
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ENGINE *ret = ENGINE_new();
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if (!ret)
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return NULL;
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if (!ENGINE_set_id(ret, engine_dynamic_id) ||
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!ENGINE_set_name(ret, engine_dynamic_name) ||
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!ENGINE_set_init_function(ret, dynamic_init) ||
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!ENGINE_set_finish_function(ret, dynamic_finish) ||
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!ENGINE_set_ctrl_function(ret, dynamic_ctrl) ||
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!ENGINE_set_flags(ret, ENGINE_FLAGS_BY_ID_COPY) ||
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!ENGINE_set_cmd_defns(ret, dynamic_cmd_defns)) {
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ENGINE_free(ret);
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return NULL;
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}
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return ret;
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}
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void ENGINE_load_dynamic(void)
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{
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ENGINE *toadd = engine_dynamic();
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if (!toadd)
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return;
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ENGINE_add(toadd);
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/*
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* If the "add" worked, it gets a structural reference. So either way, we
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* release our just-created reference.
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*/
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ENGINE_free(toadd);
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/*
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* If the "add" didn't work, it was probably a conflict because it was
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* already added (eg. someone calling ENGINE_load_blah then calling
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* ENGINE_load_builtin_engines() perhaps).
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*/
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ERR_clear_error();
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}
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static int dynamic_init(ENGINE *e)
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{
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/*
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* We always return failure - the "dyanamic" engine itself can't be used
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* for anything.
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*/
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return 0;
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}
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static int dynamic_finish(ENGINE *e)
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{
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/*
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* This should never be called on account of "dynamic_init" always
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* failing.
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*/
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return 0;
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}
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static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void))
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{
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dynamic_data_ctx *ctx = dynamic_get_data_ctx(e);
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int initialised;
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if (!ctx) {
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ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_NOT_LOADED);
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return 0;
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}
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initialised = ((ctx->dynamic_dso == NULL) ? 0 : 1);
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/* All our control commands require the ENGINE to be uninitialised */
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if (initialised) {
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ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_ALREADY_LOADED);
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return 0;
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}
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switch (cmd) {
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case DYNAMIC_CMD_SO_PATH:
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/* a NULL 'p' or a string of zero-length is the same thing */
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if (p && (strlen((const char *)p) < 1))
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p = NULL;
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if (ctx->DYNAMIC_LIBNAME)
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OPENSSL_free((void *)ctx->DYNAMIC_LIBNAME);
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if (p)
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ctx->DYNAMIC_LIBNAME = BUF_strdup(p);
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else
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ctx->DYNAMIC_LIBNAME = NULL;
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return (ctx->DYNAMIC_LIBNAME ? 1 : 0);
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case DYNAMIC_CMD_NO_VCHECK:
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ctx->no_vcheck = ((i == 0) ? 0 : 1);
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return 1;
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case DYNAMIC_CMD_ID:
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/* a NULL 'p' or a string of zero-length is the same thing */
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if (p && (strlen((const char *)p) < 1))
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p = NULL;
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if (ctx->engine_id)
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OPENSSL_free((void *)ctx->engine_id);
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if (p)
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ctx->engine_id = BUF_strdup(p);
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else
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ctx->engine_id = NULL;
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return (ctx->engine_id ? 1 : 0);
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case DYNAMIC_CMD_LIST_ADD:
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if ((i < 0) || (i > 2)) {
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ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT);
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return 0;
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}
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ctx->list_add_value = (int)i;
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return 1;
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case DYNAMIC_CMD_LOAD:
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return dynamic_load(e, ctx);
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case DYNAMIC_CMD_DIR_LOAD:
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if ((i < 0) || (i > 2)) {
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ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT);
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return 0;
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}
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ctx->dir_load = (int)i;
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return 1;
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case DYNAMIC_CMD_DIR_ADD:
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/* a NULL 'p' or a string of zero-length is the same thing */
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if (!p || (strlen((const char *)p) < 1)) {
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ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT);
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return 0;
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}
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{
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char *tmp_str = BUF_strdup(p);
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if (!tmp_str) {
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ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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sk_OPENSSL_STRING_insert(ctx->dirs, tmp_str, -1);
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}
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return 1;
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default:
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break;
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}
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ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED);
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return 0;
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}
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static int int_load(dynamic_data_ctx *ctx)
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{
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int num, loop;
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/* Unless told not to, try a direct load */
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if ((ctx->dir_load != 2) && (DSO_load(ctx->dynamic_dso,
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ctx->DYNAMIC_LIBNAME, NULL,
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0)) != NULL)
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return 1;
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/* If we're not allowed to use 'dirs' or we have none, fail */
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if (!ctx->dir_load || (num = sk_OPENSSL_STRING_num(ctx->dirs)) < 1)
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return 0;
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for (loop = 0; loop < num; loop++) {
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const char *s = sk_OPENSSL_STRING_value(ctx->dirs, loop);
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char *merge = DSO_merge(ctx->dynamic_dso, ctx->DYNAMIC_LIBNAME, s);
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if (!merge)
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return 0;
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if (DSO_load(ctx->dynamic_dso, merge, NULL, 0)) {
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/* Found what we're looking for */
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OPENSSL_free(merge);
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return 1;
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}
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OPENSSL_free(merge);
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}
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return 0;
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}
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static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx)
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{
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ENGINE cpy;
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dynamic_fns fns;
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if (!ctx->dynamic_dso)
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ctx->dynamic_dso = DSO_new();
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if (!ctx->DYNAMIC_LIBNAME) {
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if (!ctx->engine_id)
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return 0;
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ctx->DYNAMIC_LIBNAME =
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DSO_convert_filename(ctx->dynamic_dso, ctx->engine_id);
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}
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if (!int_load(ctx)) {
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ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_DSO_NOT_FOUND);
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DSO_free(ctx->dynamic_dso);
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ctx->dynamic_dso = NULL;
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return 0;
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}
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/* We have to find a bind function otherwise it'll always end badly */
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if (!
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(ctx->bind_engine =
|
|
(dynamic_bind_engine) DSO_bind_func(ctx->dynamic_dso,
|
|
ctx->DYNAMIC_F2))) {
|
|
ctx->bind_engine = NULL;
|
|
DSO_free(ctx->dynamic_dso);
|
|
ctx->dynamic_dso = NULL;
|
|
ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_DSO_FAILURE);
|
|
return 0;
|
|
}
|
|
/* Do we perform version checking? */
|
|
if (!ctx->no_vcheck) {
|
|
unsigned long vcheck_res = 0;
|
|
/*
|
|
* Now we try to find a version checking function and decide how to
|
|
* cope with failure if/when it fails.
|
|
*/
|
|
ctx->v_check =
|
|
(dynamic_v_check_fn) DSO_bind_func(ctx->dynamic_dso,
|
|
ctx->DYNAMIC_F1);
|
|
if (ctx->v_check)
|
|
vcheck_res = ctx->v_check(OSSL_DYNAMIC_VERSION);
|
|
/*
|
|
* We fail if the version checker veto'd the load *or* if it is
|
|
* deferring to us (by returning its version) and we think it is too
|
|
* old.
|
|
*/
|
|
if (vcheck_res < OSSL_DYNAMIC_OLDEST) {
|
|
/* Fail */
|
|
ctx->bind_engine = NULL;
|
|
ctx->v_check = NULL;
|
|
DSO_free(ctx->dynamic_dso);
|
|
ctx->dynamic_dso = NULL;
|
|
ENGINEerr(ENGINE_F_DYNAMIC_LOAD,
|
|
ENGINE_R_VERSION_INCOMPATIBILITY);
|
|
return 0;
|
|
}
|
|
}
|
|
/*
|
|
* First binary copy the ENGINE structure so that we can roll back if the
|
|
* hand-over fails
|
|
*/
|
|
memcpy(&cpy, e, sizeof(ENGINE));
|
|
/*
|
|
* Provide the ERR, "ex_data", memory, and locking callbacks so the
|
|
* loaded library uses our state rather than its own. FIXME: As noted in
|
|
* engine.h, much of this would be simplified if each area of code
|
|
* provided its own "summary" structure of all related callbacks. It
|
|
* would also increase opaqueness.
|
|
*/
|
|
fns.static_state = ENGINE_get_static_state();
|
|
fns.err_fns = ERR_get_implementation();
|
|
fns.ex_data_fns = CRYPTO_get_ex_data_implementation();
|
|
CRYPTO_get_mem_functions(&fns.mem_fns.malloc_cb,
|
|
&fns.mem_fns.realloc_cb, &fns.mem_fns.free_cb);
|
|
fns.lock_fns.lock_locking_cb = CRYPTO_get_locking_callback();
|
|
fns.lock_fns.lock_add_lock_cb = CRYPTO_get_add_lock_callback();
|
|
fns.lock_fns.dynlock_create_cb = CRYPTO_get_dynlock_create_callback();
|
|
fns.lock_fns.dynlock_lock_cb = CRYPTO_get_dynlock_lock_callback();
|
|
fns.lock_fns.dynlock_destroy_cb = CRYPTO_get_dynlock_destroy_callback();
|
|
/*
|
|
* Now that we've loaded the dynamic engine, make sure no "dynamic"
|
|
* ENGINE elements will show through.
|
|
*/
|
|
engine_set_all_null(e);
|
|
|
|
/* Try to bind the ENGINE onto our own ENGINE structure */
|
|
if (!ctx->bind_engine(e, ctx->engine_id, &fns)) {
|
|
ctx->bind_engine = NULL;
|
|
ctx->v_check = NULL;
|
|
DSO_free(ctx->dynamic_dso);
|
|
ctx->dynamic_dso = NULL;
|
|
ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_INIT_FAILED);
|
|
/* Copy the original ENGINE structure back */
|
|
memcpy(e, &cpy, sizeof(ENGINE));
|
|
return 0;
|
|
}
|
|
/* Do we try to add this ENGINE to the internal list too? */
|
|
if (ctx->list_add_value > 0) {
|
|
if (!ENGINE_add(e)) {
|
|
/* Do we tolerate this or fail? */
|
|
if (ctx->list_add_value > 1) {
|
|
/*
|
|
* Fail - NB: By this time, it's too late to rollback, and
|
|
* trying to do so allows the bind_engine() code to have
|
|
* created leaks. We just have to fail where we are, after
|
|
* the ENGINE has changed.
|
|
*/
|
|
ENGINEerr(ENGINE_F_DYNAMIC_LOAD,
|
|
ENGINE_R_CONFLICTING_ENGINE_ID);
|
|
return 0;
|
|
}
|
|
/* Tolerate */
|
|
ERR_clear_error();
|
|
}
|
|
}
|
|
return 1;
|
|
}
|