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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