[331] | 1 | /*
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| 2 | * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include "dso_locl.h"
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| 11 |
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| 12 | static DSO_METHOD *default_DSO_meth = NULL;
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| 13 |
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| 14 | static DSO *DSO_new_method(DSO_METHOD *meth)
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| 15 | {
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| 16 | DSO *ret;
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| 17 |
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| 18 | if (default_DSO_meth == NULL) {
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| 19 | /*
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| 20 | * We default to DSO_METH_openssl() which in turn defaults to
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| 21 | * stealing the "best available" method. Will fallback to
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| 22 | * DSO_METH_null() in the worst case.
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| 23 | */
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| 24 | default_DSO_meth = DSO_METHOD_openssl();
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| 25 | }
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| 26 | ret = OPENSSL_zalloc(sizeof(*ret));
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| 27 | if (ret == NULL) {
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| 28 | DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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| 29 | return (NULL);
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| 30 | }
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| 31 | ret->meth_data = sk_void_new_null();
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| 32 | if (ret->meth_data == NULL) {
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| 33 | /* sk_new doesn't generate any errors so we do */
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| 34 | DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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| 35 | OPENSSL_free(ret);
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| 36 | return (NULL);
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| 37 | }
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| 38 | ret->meth = default_DSO_meth;
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| 39 | ret->references = 1;
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| 40 | ret->lock = CRYPTO_THREAD_lock_new();
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| 41 | if (ret->lock == NULL) {
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| 42 | DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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| 43 | sk_void_free(ret->meth_data);
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| 44 | OPENSSL_free(ret);
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| 45 | return NULL;
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| 46 | }
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| 47 |
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| 48 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
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| 49 | DSO_free(ret);
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| 50 | ret = NULL;
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| 51 | }
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| 52 |
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| 53 | return ret;
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| 54 | }
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| 55 |
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| 56 | DSO *DSO_new(void)
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| 57 | {
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| 58 | return DSO_new_method(NULL);
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| 59 | }
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| 60 |
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| 61 | int DSO_free(DSO *dso)
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| 62 | {
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| 63 | int i;
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| 64 |
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| 65 | if (dso == NULL)
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| 66 | return (1);
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| 67 |
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| 68 | if (CRYPTO_atomic_add(&dso->references, -1, &i, dso->lock) <= 0)
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| 69 | return 0;
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| 70 |
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| 71 | REF_PRINT_COUNT("DSO", dso);
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| 72 | if (i > 0)
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| 73 | return 1;
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| 74 | REF_ASSERT_ISNT(i < 0);
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| 75 |
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| 76 | if ((dso->flags & DSO_FLAG_NO_UNLOAD_ON_FREE) == 0) {
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| 77 | if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
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| 78 | DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
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| 79 | return 0;
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| 80 | }
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| 81 | }
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| 82 |
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| 83 | if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
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| 84 | DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED);
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| 85 | return 0;
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| 86 | }
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| 87 |
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| 88 | sk_void_free(dso->meth_data);
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| 89 | OPENSSL_free(dso->filename);
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| 90 | OPENSSL_free(dso->loaded_filename);
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| 91 | CRYPTO_THREAD_lock_free(dso->lock);
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| 92 | OPENSSL_free(dso);
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| 93 | return 1;
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| 94 | }
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| 95 |
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| 96 | int DSO_flags(DSO *dso)
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| 97 | {
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| 98 | return ((dso == NULL) ? 0 : dso->flags);
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| 99 | }
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| 100 |
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| 101 | int DSO_up_ref(DSO *dso)
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| 102 | {
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| 103 | int i;
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| 104 |
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| 105 | if (dso == NULL) {
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| 106 | DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
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| 107 | return 0;
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| 108 | }
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| 109 |
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| 110 | if (CRYPTO_atomic_add(&dso->references, 1, &i, dso->lock) <= 0)
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| 111 | return 0;
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| 112 |
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| 113 | REF_PRINT_COUNT("DSO", r);
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| 114 | REF_ASSERT_ISNT(i < 2);
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| 115 | return ((i > 1) ? 1 : 0);
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| 116 | }
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| 117 |
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| 118 | DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
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| 119 | {
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| 120 | DSO *ret;
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| 121 | int allocated = 0;
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| 122 |
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| 123 | if (dso == NULL) {
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| 124 | ret = DSO_new_method(meth);
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| 125 | if (ret == NULL) {
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| 126 | DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE);
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| 127 | goto err;
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| 128 | }
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| 129 | allocated = 1;
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| 130 | /* Pass the provided flags to the new DSO object */
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| 131 | if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
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| 132 | DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED);
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| 133 | goto err;
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| 134 | }
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| 135 | } else
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| 136 | ret = dso;
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| 137 | /* Don't load if we're currently already loaded */
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| 138 | if (ret->filename != NULL) {
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| 139 | DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED);
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| 140 | goto err;
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| 141 | }
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| 142 | /*
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| 143 | * filename can only be NULL if we were passed a dso that already has one
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| 144 | * set.
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| 145 | */
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| 146 | if (filename != NULL)
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| 147 | if (!DSO_set_filename(ret, filename)) {
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| 148 | DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED);
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| 149 | goto err;
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| 150 | }
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| 151 | filename = ret->filename;
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| 152 | if (filename == NULL) {
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| 153 | DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME);
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| 154 | goto err;
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| 155 | }
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| 156 | if (ret->meth->dso_load == NULL) {
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| 157 | DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED);
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| 158 | goto err;
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| 159 | }
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| 160 | if (!ret->meth->dso_load(ret)) {
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| 161 | DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED);
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| 162 | goto err;
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| 163 | }
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| 164 | /* Load succeeded */
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| 165 | return (ret);
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| 166 | err:
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| 167 | if (allocated)
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| 168 | DSO_free(ret);
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| 169 | return (NULL);
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| 170 | }
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| 171 |
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| 172 | DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
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| 173 | {
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| 174 | DSO_FUNC_TYPE ret = NULL;
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| 175 |
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| 176 | if ((dso == NULL) || (symname == NULL)) {
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| 177 | DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
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| 178 | return (NULL);
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| 179 | }
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| 180 | if (dso->meth->dso_bind_func == NULL) {
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| 181 | DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED);
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| 182 | return (NULL);
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| 183 | }
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| 184 | if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
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| 185 | DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE);
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| 186 | return (NULL);
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| 187 | }
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| 188 | /* Success */
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| 189 | return (ret);
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| 190 | }
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| 191 |
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| 192 | /*
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| 193 | * I don't really like these *_ctrl functions very much to be perfectly
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| 194 | * honest. For one thing, I think I have to return a negative value for any
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| 195 | * error because possible DSO_ctrl() commands may return values such as
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| 196 | * "size"s that can legitimately be zero (making the standard
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| 197 | * "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
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| 198 | * times. I'd prefer "output" values to be passed by reference and the return
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| 199 | * value as success/failure like usual ... but we conform when we must... :-)
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| 200 | */
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| 201 | long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
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| 202 | {
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| 203 | if (dso == NULL) {
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| 204 | DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER);
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| 205 | return (-1);
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| 206 | }
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| 207 | /*
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| 208 | * We should intercept certain generic commands and only pass control to
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| 209 | * the method-specific ctrl() function if it's something we don't handle.
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| 210 | */
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| 211 | switch (cmd) {
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| 212 | case DSO_CTRL_GET_FLAGS:
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| 213 | return dso->flags;
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| 214 | case DSO_CTRL_SET_FLAGS:
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| 215 | dso->flags = (int)larg;
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| 216 | return (0);
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| 217 | case DSO_CTRL_OR_FLAGS:
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| 218 | dso->flags |= (int)larg;
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| 219 | return (0);
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| 220 | default:
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| 221 | break;
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| 222 | }
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| 223 | if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
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| 224 | DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED);
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| 225 | return (-1);
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| 226 | }
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| 227 | return (dso->meth->dso_ctrl(dso, cmd, larg, parg));
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| 228 | }
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| 229 |
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| 230 | const char *DSO_get_filename(DSO *dso)
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| 231 | {
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| 232 | if (dso == NULL) {
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| 233 | DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
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| 234 | return (NULL);
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| 235 | }
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| 236 | return (dso->filename);
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| 237 | }
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| 238 |
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| 239 | int DSO_set_filename(DSO *dso, const char *filename)
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| 240 | {
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| 241 | char *copied;
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| 242 |
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| 243 | if ((dso == NULL) || (filename == NULL)) {
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| 244 | DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
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| 245 | return (0);
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| 246 | }
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| 247 | if (dso->loaded_filename) {
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| 248 | DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED);
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| 249 | return (0);
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| 250 | }
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| 251 | /* We'll duplicate filename */
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| 252 | copied = OPENSSL_strdup(filename);
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| 253 | if (copied == NULL) {
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| 254 | DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE);
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| 255 | return (0);
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| 256 | }
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| 257 | OPENSSL_free(dso->filename);
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| 258 | dso->filename = copied;
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| 259 | return (1);
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| 260 | }
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| 261 |
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| 262 | char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
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| 263 | {
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| 264 | char *result = NULL;
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| 265 |
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| 266 | if (dso == NULL || filespec1 == NULL) {
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| 267 | DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER);
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| 268 | return (NULL);
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| 269 | }
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| 270 | if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
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| 271 | if (dso->merger != NULL)
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| 272 | result = dso->merger(dso, filespec1, filespec2);
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| 273 | else if (dso->meth->dso_merger != NULL)
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| 274 | result = dso->meth->dso_merger(dso, filespec1, filespec2);
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| 275 | }
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| 276 | return (result);
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| 277 | }
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| 278 |
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| 279 | char *DSO_convert_filename(DSO *dso, const char *filename)
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| 280 | {
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| 281 | char *result = NULL;
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| 282 |
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| 283 | if (dso == NULL) {
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| 284 | DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
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| 285 | return (NULL);
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| 286 | }
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| 287 | if (filename == NULL)
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| 288 | filename = dso->filename;
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| 289 | if (filename == NULL) {
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| 290 | DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME);
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| 291 | return (NULL);
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| 292 | }
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| 293 | if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
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| 294 | if (dso->name_converter != NULL)
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| 295 | result = dso->name_converter(dso, filename);
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| 296 | else if (dso->meth->dso_name_converter != NULL)
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| 297 | result = dso->meth->dso_name_converter(dso, filename);
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| 298 | }
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| 299 | if (result == NULL) {
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| 300 | result = OPENSSL_strdup(filename);
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| 301 | if (result == NULL) {
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| 302 | DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE);
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| 303 | return (NULL);
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| 304 | }
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| 305 | }
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| 306 | return (result);
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| 307 | }
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| 308 |
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| 309 | int DSO_pathbyaddr(void *addr, char *path, int sz)
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| 310 | {
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| 311 | DSO_METHOD *meth = default_DSO_meth;
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| 312 | if (meth == NULL)
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| 313 | meth = DSO_METHOD_openssl();
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| 314 | if (meth->pathbyaddr == NULL) {
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| 315 | DSOerr(DSO_F_DSO_PATHBYADDR, DSO_R_UNSUPPORTED);
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| 316 | return -1;
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| 317 | }
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| 318 | return (*meth->pathbyaddr) (addr, path, sz);
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| 319 | }
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| 320 |
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| 321 | DSO *DSO_dsobyaddr(void *addr, int flags)
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| 322 | {
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| 323 | DSO *ret = NULL;
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| 324 | char *filename = NULL;
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| 325 | int len = DSO_pathbyaddr(addr, NULL, 0);
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| 326 |
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| 327 | if (len < 0)
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| 328 | return NULL;
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| 329 |
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| 330 | filename = OPENSSL_malloc(len);
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| 331 | if (filename != NULL
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| 332 | && DSO_pathbyaddr(addr, filename, len) == len)
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| 333 | ret = DSO_load(NULL, filename, NULL, flags);
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| 334 |
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| 335 | OPENSSL_free(filename);
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| 336 | return ret;
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| 337 | }
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| 338 |
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| 339 | void *DSO_global_lookup(const char *name)
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| 340 | {
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| 341 | DSO_METHOD *meth = default_DSO_meth;
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| 342 | if (meth == NULL)
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| 343 | meth = DSO_METHOD_openssl();
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| 344 | if (meth->globallookup == NULL) {
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| 345 | DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED);
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| 346 | return NULL;
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| 347 | }
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| 348 | return (*meth->globallookup) (name);
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| 349 | }
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