diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/engine/eng_dyn.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/engine/eng_dyn.c | 510 |
1 files changed, 510 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/engine/eng_dyn.c b/openssl-1.1.0h/crypto/engine/eng_dyn.c new file mode 100644 index 0000000..843226c --- /dev/null +++ b/openssl-1.1.0h/crypto/engine/eng_dyn.c @@ -0,0 +1,510 @@ +/* + * Copyright 2001-2016 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 "eng_int.h" +#include "internal/dso.h" +#include <openssl/crypto.h> + +/* + * Shared libraries implementing ENGINEs for use by the "dynamic" ENGINE + * loader should implement the hook-up functions with the following + * prototypes. + */ + +/* Our ENGINE handlers */ +static int dynamic_init(ENGINE *e); +static int dynamic_finish(ENGINE *e); +static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, + void (*f) (void)); +/* Predeclare our context type */ +typedef struct st_dynamic_data_ctx dynamic_data_ctx; +/* The implementation for the important control command */ +static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx); + +#define DYNAMIC_CMD_SO_PATH ENGINE_CMD_BASE +#define DYNAMIC_CMD_NO_VCHECK (ENGINE_CMD_BASE + 1) +#define DYNAMIC_CMD_ID (ENGINE_CMD_BASE + 2) +#define DYNAMIC_CMD_LIST_ADD (ENGINE_CMD_BASE + 3) +#define DYNAMIC_CMD_DIR_LOAD (ENGINE_CMD_BASE + 4) +#define DYNAMIC_CMD_DIR_ADD (ENGINE_CMD_BASE + 5) +#define DYNAMIC_CMD_LOAD (ENGINE_CMD_BASE + 6) + +/* The constants used when creating the ENGINE */ +static const char *engine_dynamic_id = "dynamic"; +static const char *engine_dynamic_name = "Dynamic engine loading support"; +static const ENGINE_CMD_DEFN dynamic_cmd_defns[] = { + {DYNAMIC_CMD_SO_PATH, + "SO_PATH", + "Specifies the path to the new ENGINE shared library", + ENGINE_CMD_FLAG_STRING}, + {DYNAMIC_CMD_NO_VCHECK, + "NO_VCHECK", + "Specifies to continue even if version checking fails (boolean)", + ENGINE_CMD_FLAG_NUMERIC}, + {DYNAMIC_CMD_ID, + "ID", + "Specifies an ENGINE id name for loading", + ENGINE_CMD_FLAG_STRING}, + {DYNAMIC_CMD_LIST_ADD, + "LIST_ADD", + "Whether to add a loaded ENGINE to the internal list (0=no,1=yes,2=mandatory)", + ENGINE_CMD_FLAG_NUMERIC}, + {DYNAMIC_CMD_DIR_LOAD, + "DIR_LOAD", + "Specifies whether to load from 'DIR_ADD' directories (0=no,1=yes,2=mandatory)", + ENGINE_CMD_FLAG_NUMERIC}, + {DYNAMIC_CMD_DIR_ADD, + "DIR_ADD", + "Adds a directory from which ENGINEs can be loaded", + ENGINE_CMD_FLAG_STRING}, + {DYNAMIC_CMD_LOAD, + "LOAD", + "Load up the ENGINE specified by other settings", + ENGINE_CMD_FLAG_NO_INPUT}, + {0, NULL, NULL, 0} +}; + +/* + * Loading code stores state inside the ENGINE structure via the "ex_data" + * element. We load all our state into a single structure and use that as a + * single context in the "ex_data" stack. + */ +struct st_dynamic_data_ctx { + /* The DSO object we load that supplies the ENGINE code */ + DSO *dynamic_dso; + /* + * The function pointer to the version checking shared library function + */ + dynamic_v_check_fn v_check; + /* + * The function pointer to the engine-binding shared library function + */ + dynamic_bind_engine bind_engine; + /* The default name/path for loading the shared library */ + char *DYNAMIC_LIBNAME; + /* Whether to continue loading on a version check failure */ + int no_vcheck; + /* If non-NULL, stipulates the 'id' of the ENGINE to be loaded */ + char *engine_id; + /* + * If non-zero, a successfully loaded ENGINE should be added to the + * internal ENGINE list. If 2, the add must succeed or the entire load + * should fail. + */ + int list_add_value; + /* The symbol name for the version checking function */ + const char *DYNAMIC_F1; + /* The symbol name for the "initialise ENGINE structure" function */ + const char *DYNAMIC_F2; + /* + * Whether to never use 'dirs', use 'dirs' as a fallback, or only use + * 'dirs' for loading. Default is to use 'dirs' as a fallback. + */ + int dir_load; + /* A stack of directories from which ENGINEs could be loaded */ + STACK_OF(OPENSSL_STRING) *dirs; +}; + +/* + * This is the "ex_data" index we obtain and reserve for use with our context + * structure. + */ +static int dynamic_ex_data_idx = -1; + +static void int_free_str(char *s) +{ + OPENSSL_free(s); +} + +/* + * Because our ex_data element may or may not get allocated depending on + * whether a "first-use" occurs before the ENGINE is freed, we have a memory + * leak problem to solve. We can't declare a "new" handler for the ex_data as + * we don't want a dynamic_data_ctx in *all* ENGINE structures of all types + * (this is a bug in the design of CRYPTO_EX_DATA). As such, we just declare + * a "free" handler and that will get called if an ENGINE is being destroyed + * and there was an ex_data element corresponding to our context type. + */ +static void dynamic_data_ctx_free_func(void *parent, void *ptr, + CRYPTO_EX_DATA *ad, int idx, long argl, + void *argp) +{ + if (ptr) { + dynamic_data_ctx *ctx = (dynamic_data_ctx *)ptr; + DSO_free(ctx->dynamic_dso); + OPENSSL_free(ctx->DYNAMIC_LIBNAME); + OPENSSL_free(ctx->engine_id); + sk_OPENSSL_STRING_pop_free(ctx->dirs, int_free_str); + OPENSSL_free(ctx); + } +} + +/* + * Construct the per-ENGINE context. We create it blindly and then use a lock + * to check for a race - if so, all but one of the threads "racing" will have + * wasted their time. The alternative involves creating everything inside the + * lock which is far worse. + */ +static int dynamic_set_data_ctx(ENGINE *e, dynamic_data_ctx **ctx) +{ + dynamic_data_ctx *c = OPENSSL_zalloc(sizeof(*c)); + int ret = 1; + + if (c == NULL) { + ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE); + return 0; + } + c->dirs = sk_OPENSSL_STRING_new_null(); + if (c->dirs == NULL) { + ENGINEerr(ENGINE_F_DYNAMIC_SET_DATA_CTX, ERR_R_MALLOC_FAILURE); + OPENSSL_free(c); + return 0; + } + c->DYNAMIC_F1 = "v_check"; + c->DYNAMIC_F2 = "bind_engine"; + c->dir_load = 1; + CRYPTO_THREAD_write_lock(global_engine_lock); + if ((*ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, + dynamic_ex_data_idx)) + == NULL) { + /* Good, we're the first */ + ret = ENGINE_set_ex_data(e, dynamic_ex_data_idx, c); + if (ret) { + *ctx = c; + c = NULL; + } + } + CRYPTO_THREAD_unlock(global_engine_lock); + /* + * If we lost the race to set the context, c is non-NULL and *ctx is the + * context of the thread that won. + */ + if (c) + sk_OPENSSL_STRING_free(c->dirs); + OPENSSL_free(c); + return ret; +} + +/* + * This function retrieves the context structure from an ENGINE's "ex_data", + * or if it doesn't exist yet, sets it up. + */ +static dynamic_data_ctx *dynamic_get_data_ctx(ENGINE *e) +{ + dynamic_data_ctx *ctx; + if (dynamic_ex_data_idx < 0) { + /* + * Create and register the ENGINE ex_data, and associate our "free" + * function with it to ensure any allocated contexts get freed when + * an ENGINE goes underground. + */ + int new_idx = ENGINE_get_ex_new_index(0, NULL, NULL, NULL, + dynamic_data_ctx_free_func); + if (new_idx == -1) { + ENGINEerr(ENGINE_F_DYNAMIC_GET_DATA_CTX, ENGINE_R_NO_INDEX); + return NULL; + } + CRYPTO_THREAD_write_lock(global_engine_lock); + /* Avoid a race by checking again inside this lock */ + if (dynamic_ex_data_idx < 0) { + /* Good, someone didn't beat us to it */ + dynamic_ex_data_idx = new_idx; + new_idx = -1; + } + CRYPTO_THREAD_unlock(global_engine_lock); + /* + * In theory we could "give back" the index here if (new_idx>-1), but + * it's not possible and wouldn't gain us much if it were. + */ + } + ctx = (dynamic_data_ctx *)ENGINE_get_ex_data(e, dynamic_ex_data_idx); + /* Check if the context needs to be created */ + if ((ctx == NULL) && !dynamic_set_data_ctx(e, &ctx)) + /* "set_data" will set errors if necessary */ + return NULL; + return ctx; +} + +static ENGINE *engine_dynamic(void) +{ + ENGINE *ret = ENGINE_new(); + if (ret == NULL) + return NULL; + if (!ENGINE_set_id(ret, engine_dynamic_id) || + !ENGINE_set_name(ret, engine_dynamic_name) || + !ENGINE_set_init_function(ret, dynamic_init) || + !ENGINE_set_finish_function(ret, dynamic_finish) || + !ENGINE_set_ctrl_function(ret, dynamic_ctrl) || + !ENGINE_set_flags(ret, ENGINE_FLAGS_BY_ID_COPY) || + !ENGINE_set_cmd_defns(ret, dynamic_cmd_defns)) { + ENGINE_free(ret); + return NULL; + } + return ret; +} + +void engine_load_dynamic_int(void) +{ + ENGINE *toadd = engine_dynamic(); + if (!toadd) + return; + ENGINE_add(toadd); + /* + * If the "add" worked, it gets a structural reference. So either way, we + * release our just-created reference. + */ + ENGINE_free(toadd); + /* + * If the "add" didn't work, it was probably a conflict because it was + * already added (eg. someone calling ENGINE_load_blah then calling + * ENGINE_load_builtin_engines() perhaps). + */ + ERR_clear_error(); +} + +static int dynamic_init(ENGINE *e) +{ + /* + * We always return failure - the "dynamic" engine itself can't be used + * for anything. + */ + return 0; +} + +static int dynamic_finish(ENGINE *e) +{ + /* + * This should never be called on account of "dynamic_init" always + * failing. + */ + return 0; +} + +static int dynamic_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void)) +{ + dynamic_data_ctx *ctx = dynamic_get_data_ctx(e); + int initialised; + + if (!ctx) { + ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_NOT_LOADED); + return 0; + } + initialised = ((ctx->dynamic_dso == NULL) ? 0 : 1); + /* All our control commands require the ENGINE to be uninitialised */ + if (initialised) { + ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_ALREADY_LOADED); + return 0; + } + switch (cmd) { + case DYNAMIC_CMD_SO_PATH: + /* a NULL 'p' or a string of zero-length is the same thing */ + if (p && (strlen((const char *)p) < 1)) + p = NULL; + OPENSSL_free(ctx->DYNAMIC_LIBNAME); + if (p) + ctx->DYNAMIC_LIBNAME = OPENSSL_strdup(p); + else + ctx->DYNAMIC_LIBNAME = NULL; + return (ctx->DYNAMIC_LIBNAME ? 1 : 0); + case DYNAMIC_CMD_NO_VCHECK: + ctx->no_vcheck = ((i == 0) ? 0 : 1); + return 1; + case DYNAMIC_CMD_ID: + /* a NULL 'p' or a string of zero-length is the same thing */ + if (p && (strlen((const char *)p) < 1)) + p = NULL; + OPENSSL_free(ctx->engine_id); + if (p) + ctx->engine_id = OPENSSL_strdup(p); + else + ctx->engine_id = NULL; + return (ctx->engine_id ? 1 : 0); + case DYNAMIC_CMD_LIST_ADD: + if ((i < 0) || (i > 2)) { + ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT); + return 0; + } + ctx->list_add_value = (int)i; + return 1; + case DYNAMIC_CMD_LOAD: + return dynamic_load(e, ctx); + case DYNAMIC_CMD_DIR_LOAD: + if ((i < 0) || (i > 2)) { + ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT); + return 0; + } + ctx->dir_load = (int)i; + return 1; + case DYNAMIC_CMD_DIR_ADD: + /* a NULL 'p' or a string of zero-length is the same thing */ + if (!p || (strlen((const char *)p) < 1)) { + ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_INVALID_ARGUMENT); + return 0; + } + { + char *tmp_str = OPENSSL_strdup(p); + if (tmp_str == NULL) { + ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ERR_R_MALLOC_FAILURE); + return 0; + } + if (!sk_OPENSSL_STRING_push(ctx->dirs, tmp_str)) { + OPENSSL_free(tmp_str); + ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ERR_R_MALLOC_FAILURE); + return 0; + } + } + return 1; + default: + break; + } + ENGINEerr(ENGINE_F_DYNAMIC_CTRL, ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED); + return 0; +} + +static int int_load(dynamic_data_ctx *ctx) +{ + int num, loop; + /* Unless told not to, try a direct load */ + if ((ctx->dir_load != 2) && (DSO_load(ctx->dynamic_dso, + ctx->DYNAMIC_LIBNAME, NULL, + 0)) != NULL) + return 1; + /* If we're not allowed to use 'dirs' or we have none, fail */ + if (!ctx->dir_load || (num = sk_OPENSSL_STRING_num(ctx->dirs)) < 1) + return 0; + for (loop = 0; loop < num; loop++) { + const char *s = sk_OPENSSL_STRING_value(ctx->dirs, loop); + char *merge = DSO_merge(ctx->dynamic_dso, ctx->DYNAMIC_LIBNAME, s); + if (!merge) + return 0; + if (DSO_load(ctx->dynamic_dso, merge, NULL, 0)) { + /* Found what we're looking for */ + OPENSSL_free(merge); + return 1; + } + OPENSSL_free(merge); + } + return 0; +} + +static int dynamic_load(ENGINE *e, dynamic_data_ctx *ctx) +{ + ENGINE cpy; + dynamic_fns fns; + + if (ctx->dynamic_dso == NULL) + ctx->dynamic_dso = DSO_new(); + if (ctx->dynamic_dso == NULL) + return 0; + if (!ctx->DYNAMIC_LIBNAME) { + if (!ctx->engine_id) + return 0; + DSO_ctrl(ctx->dynamic_dso, DSO_CTRL_SET_FLAGS, + DSO_FLAG_NAME_TRANSLATION_EXT_ONLY, NULL); + ctx->DYNAMIC_LIBNAME = + DSO_convert_filename(ctx->dynamic_dso, ctx->engine_id); + } + if (!int_load(ctx)) { + ENGINEerr(ENGINE_F_DYNAMIC_LOAD, ENGINE_R_DSO_NOT_FOUND); + DSO_free(ctx->dynamic_dso); + ctx->dynamic_dso = NULL; + return 0; + } + /* We have to find a bind function otherwise it'll always end badly */ + if (! + (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(); + CRYPTO_get_mem_functions(&fns.mem_fns.malloc_fn, &fns.mem_fns.realloc_fn, + &fns.mem_fns.free_fn); + /* + * 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; +} |