1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /* |
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4 | * EAP peer: Method registration |
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5 | * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi> |
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6 | * |
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7 | * This software may be distributed under the terms of the BSD license. |
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8 | * See README for more details. |
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9 | */ |
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10 | |
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11 | #ifdef __rtems__ |
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12 | #define RTEMS_BSD_PROGRAM_NO_FREE_WRAP |
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13 | #endif /* __rtems__ */ |
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14 | #include "includes.h" |
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15 | #ifdef CONFIG_DYNAMIC_EAP_METHODS |
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16 | #include <dlfcn.h> |
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17 | #endif /* CONFIG_DYNAMIC_EAP_METHODS */ |
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18 | |
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19 | #include "common.h" |
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20 | #include "eap_i.h" |
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21 | #include "eap_methods.h" |
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22 | |
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23 | |
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24 | static struct eap_method *eap_methods = NULL; |
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25 | |
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26 | |
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27 | /** |
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28 | * eap_peer_get_eap_method - Get EAP method based on type number |
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29 | * @vendor: EAP Vendor-Id (0 = IETF) |
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30 | * @method: EAP type number |
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31 | * Returns: Pointer to EAP method or %NULL if not found |
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32 | */ |
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33 | const struct eap_method * eap_peer_get_eap_method(int vendor, EapType method) |
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34 | { |
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35 | struct eap_method *m; |
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36 | for (m = eap_methods; m; m = m->next) { |
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37 | if (m->vendor == vendor && m->method == method) |
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38 | return m; |
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39 | } |
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40 | return NULL; |
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41 | } |
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42 | |
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43 | |
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44 | /** |
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45 | * eap_peer_get_type - Get EAP type for the given EAP method name |
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46 | * @name: EAP method name, e.g., TLS |
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47 | * @vendor: Buffer for returning EAP Vendor-Id |
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48 | * Returns: EAP method type or %EAP_TYPE_NONE if not found |
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49 | * |
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50 | * This function maps EAP type names into EAP type numbers based on the list of |
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51 | * EAP methods included in the build. |
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52 | */ |
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53 | EapType eap_peer_get_type(const char *name, int *vendor) |
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54 | { |
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55 | struct eap_method *m; |
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56 | for (m = eap_methods; m; m = m->next) { |
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57 | if (os_strcmp(m->name, name) == 0) { |
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58 | *vendor = m->vendor; |
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59 | return m->method; |
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60 | } |
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61 | } |
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62 | *vendor = EAP_VENDOR_IETF; |
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63 | return EAP_TYPE_NONE; |
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64 | } |
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65 | |
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66 | |
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67 | /** |
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68 | * eap_get_name - Get EAP method name for the given EAP type |
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69 | * @vendor: EAP Vendor-Id (0 = IETF) |
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70 | * @type: EAP method type |
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71 | * Returns: EAP method name, e.g., TLS, or %NULL if not found |
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72 | * |
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73 | * This function maps EAP type numbers into EAP type names based on the list of |
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74 | * EAP methods included in the build. |
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75 | */ |
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76 | const char * eap_get_name(int vendor, EapType type) |
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77 | { |
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78 | struct eap_method *m; |
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79 | if (vendor == EAP_VENDOR_IETF && type == EAP_TYPE_EXPANDED) |
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80 | return "expanded"; |
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81 | for (m = eap_methods; m; m = m->next) { |
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82 | if (m->vendor == vendor && m->method == type) |
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83 | return m->name; |
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84 | } |
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85 | return NULL; |
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86 | } |
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87 | |
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88 | |
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89 | /** |
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90 | * eap_get_names - Get space separated list of names for supported EAP methods |
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91 | * @buf: Buffer for names |
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92 | * @buflen: Buffer length |
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93 | * Returns: Number of characters written into buf (not including nul |
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94 | * termination) |
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95 | */ |
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96 | size_t eap_get_names(char *buf, size_t buflen) |
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97 | { |
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98 | char *pos, *end; |
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99 | struct eap_method *m; |
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100 | int ret; |
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101 | |
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102 | if (buflen == 0) |
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103 | return 0; |
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104 | |
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105 | pos = buf; |
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106 | end = pos + buflen; |
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107 | |
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108 | for (m = eap_methods; m; m = m->next) { |
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109 | ret = os_snprintf(pos, end - pos, "%s%s", |
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110 | m == eap_methods ? "" : " ", m->name); |
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111 | if (os_snprintf_error(end - pos, ret)) |
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112 | break; |
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113 | pos += ret; |
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114 | } |
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115 | buf[buflen - 1] = '\0'; |
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116 | |
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117 | return pos - buf; |
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118 | } |
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119 | |
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120 | |
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121 | /** |
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122 | * eap_get_names_as_string_array - Get supported EAP methods as string array |
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123 | * @num: Buffer for returning the number of items in array, not including %NULL |
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124 | * terminator. This parameter can be %NULL if the length is not needed. |
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125 | * Returns: A %NULL-terminated array of strings, or %NULL on error. |
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126 | * |
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127 | * This function returns the list of names for all supported EAP methods as an |
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128 | * array of strings. The caller must free the returned array items and the |
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129 | * array. |
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130 | */ |
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131 | char ** eap_get_names_as_string_array(size_t *num) |
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132 | { |
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133 | struct eap_method *m; |
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134 | size_t array_len = 0; |
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135 | char **array; |
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136 | int i = 0, j; |
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137 | |
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138 | for (m = eap_methods; m; m = m->next) |
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139 | array_len++; |
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140 | |
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141 | array = os_calloc(array_len + 1, sizeof(char *)); |
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142 | if (array == NULL) |
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143 | return NULL; |
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144 | |
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145 | for (m = eap_methods; m; m = m->next) { |
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146 | array[i++] = os_strdup(m->name); |
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147 | if (array[i - 1] == NULL) { |
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148 | for (j = 0; j < i; j++) |
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149 | os_free(array[j]); |
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150 | os_free(array); |
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151 | return NULL; |
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152 | } |
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153 | } |
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154 | array[i] = NULL; |
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155 | |
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156 | if (num) |
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157 | *num = array_len; |
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158 | |
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159 | return array; |
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160 | } |
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161 | |
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162 | |
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163 | /** |
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164 | * eap_peer_get_methods - Get a list of enabled EAP peer methods |
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165 | * @count: Set to number of available methods |
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166 | * Returns: List of enabled EAP peer methods |
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167 | */ |
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168 | const struct eap_method * eap_peer_get_methods(size_t *count) |
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169 | { |
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170 | int c = 0; |
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171 | struct eap_method *m; |
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172 | |
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173 | for (m = eap_methods; m; m = m->next) |
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174 | c++; |
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175 | |
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176 | *count = c; |
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177 | return eap_methods; |
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178 | } |
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179 | |
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180 | |
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181 | #ifdef CONFIG_DYNAMIC_EAP_METHODS |
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182 | /** |
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183 | * eap_peer_method_load - Load a dynamic EAP method library (shared object) |
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184 | * @so: File path for the shared object file to load |
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185 | * Returns: 0 on success, -1 on failure |
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186 | */ |
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187 | int eap_peer_method_load(const char *so) |
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188 | { |
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189 | void *handle; |
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190 | int (*dyn_init)(void); |
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191 | int ret; |
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192 | |
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193 | handle = dlopen(so, RTLD_LAZY); |
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194 | if (handle == NULL) { |
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195 | wpa_printf(MSG_ERROR, "EAP: Failed to open dynamic EAP method " |
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196 | "'%s': %s", so, dlerror()); |
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197 | return -1; |
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198 | } |
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199 | |
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200 | dyn_init = dlsym(handle, "eap_peer_method_dynamic_init"); |
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201 | if (dyn_init == NULL) { |
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202 | dlclose(handle); |
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203 | wpa_printf(MSG_ERROR, "EAP: Invalid EAP method '%s' - no " |
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204 | "eap_peer_method_dynamic_init()", so); |
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205 | return -1; |
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206 | } |
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207 | |
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208 | ret = dyn_init(); |
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209 | if (ret) { |
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210 | dlclose(handle); |
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211 | wpa_printf(MSG_ERROR, "EAP: Failed to add EAP method '%s' - " |
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212 | "ret %d", so, ret); |
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213 | return ret; |
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214 | } |
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215 | |
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216 | /* Store the handle for this shared object. It will be freed with |
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217 | * dlclose() when the EAP method is unregistered. */ |
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218 | eap_methods->dl_handle = handle; |
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219 | |
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220 | wpa_printf(MSG_DEBUG, "EAP: Loaded dynamic EAP method: '%s'", so); |
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221 | |
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222 | return 0; |
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223 | } |
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224 | |
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225 | |
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226 | /** |
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227 | * eap_peer_method_unload - Unload a dynamic EAP method library (shared object) |
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228 | * @method: Pointer to the dynamically loaded EAP method |
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229 | * Returns: 0 on success, -1 on failure |
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230 | * |
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231 | * This function can be used to unload EAP methods that have been previously |
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232 | * loaded with eap_peer_method_load(). Before unloading the method, all |
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233 | * references to the method must be removed to make sure that no dereferences |
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234 | * of freed memory will occur after unloading. |
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235 | */ |
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236 | int eap_peer_method_unload(struct eap_method *method) |
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237 | { |
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238 | struct eap_method *m, *prev; |
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239 | void *handle; |
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240 | |
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241 | m = eap_methods; |
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242 | prev = NULL; |
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243 | while (m) { |
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244 | if (m == method) |
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245 | break; |
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246 | prev = m; |
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247 | m = m->next; |
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248 | } |
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249 | |
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250 | if (m == NULL || m->dl_handle == NULL) |
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251 | return -1; |
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252 | |
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253 | if (prev) |
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254 | prev->next = m->next; |
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255 | else |
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256 | eap_methods = m->next; |
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257 | |
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258 | handle = m->dl_handle; |
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259 | |
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260 | if (m->free) |
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261 | m->free(m); |
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262 | else |
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263 | eap_peer_method_free(m); |
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264 | |
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265 | dlclose(handle); |
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266 | |
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267 | return 0; |
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268 | } |
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269 | #endif /* CONFIG_DYNAMIC_EAP_METHODS */ |
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270 | |
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271 | |
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272 | /** |
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273 | * eap_peer_method_alloc - Allocate EAP peer method structure |
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274 | * @version: Version of the EAP peer method interface (set to |
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275 | * EAP_PEER_METHOD_INTERFACE_VERSION) |
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276 | * @vendor: EAP Vendor-ID (EAP_VENDOR_*) (0 = IETF) |
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277 | * @method: EAP type number (EAP_TYPE_*) |
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278 | * @name: Name of the method (e.g., "TLS") |
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279 | * Returns: Allocated EAP method structure or %NULL on failure |
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280 | * |
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281 | * The returned structure should be freed with eap_peer_method_free() when it |
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282 | * is not needed anymore. |
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283 | */ |
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284 | struct eap_method * eap_peer_method_alloc(int version, int vendor, |
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285 | EapType method, const char *name) |
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286 | { |
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287 | struct eap_method *eap; |
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288 | eap = os_zalloc(sizeof(*eap)); |
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289 | if (eap == NULL) |
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290 | return NULL; |
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291 | eap->version = version; |
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292 | eap->vendor = vendor; |
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293 | eap->method = method; |
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294 | eap->name = name; |
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295 | return eap; |
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296 | } |
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297 | |
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298 | |
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299 | /** |
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300 | * eap_peer_method_free - Free EAP peer method structure |
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301 | * @method: Method structure allocated with eap_peer_method_alloc() |
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302 | */ |
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303 | void eap_peer_method_free(struct eap_method *method) |
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304 | { |
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305 | os_free(method); |
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306 | } |
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307 | |
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308 | |
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309 | /** |
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310 | * eap_peer_method_register - Register an EAP peer method |
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311 | * @method: EAP method to register |
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312 | * Returns: 0 on success, -1 on invalid method, or -2 if a matching EAP method |
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313 | * has already been registered |
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314 | * |
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315 | * Each EAP peer method needs to call this function to register itself as a |
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316 | * supported EAP method. |
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317 | */ |
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318 | int eap_peer_method_register(struct eap_method *method) |
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319 | { |
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320 | struct eap_method *m, *last = NULL; |
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321 | |
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322 | if (method == NULL || method->name == NULL || |
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323 | method->version != EAP_PEER_METHOD_INTERFACE_VERSION) |
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324 | return -1; |
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325 | |
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326 | for (m = eap_methods; m; m = m->next) { |
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327 | if ((m->vendor == method->vendor && |
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328 | m->method == method->method) || |
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329 | os_strcmp(m->name, method->name) == 0) |
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330 | return -2; |
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331 | last = m; |
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332 | } |
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333 | |
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334 | if (last) |
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335 | last->next = method; |
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336 | else |
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337 | eap_methods = method; |
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338 | |
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339 | return 0; |
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340 | } |
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341 | |
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342 | |
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343 | /** |
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344 | * eap_peer_unregister_methods - Unregister EAP peer methods |
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345 | * |
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346 | * This function is called at program termination to unregister all EAP peer |
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347 | * methods. |
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348 | */ |
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349 | void eap_peer_unregister_methods(void) |
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350 | { |
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351 | struct eap_method *m; |
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352 | #ifdef CONFIG_DYNAMIC_EAP_METHODS |
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353 | void *handle; |
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354 | #endif /* CONFIG_DYNAMIC_EAP_METHODS */ |
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355 | |
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356 | while (eap_methods) { |
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357 | m = eap_methods; |
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358 | eap_methods = eap_methods->next; |
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359 | |
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360 | #ifdef CONFIG_DYNAMIC_EAP_METHODS |
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361 | handle = m->dl_handle; |
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362 | #endif /* CONFIG_DYNAMIC_EAP_METHODS */ |
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363 | |
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364 | if (m->free) |
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365 | m->free(m); |
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366 | else |
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367 | eap_peer_method_free(m); |
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368 | |
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369 | #ifdef CONFIG_DYNAMIC_EAP_METHODS |
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370 | if (handle) |
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371 | dlclose(handle); |
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372 | #endif /* CONFIG_DYNAMIC_EAP_METHODS */ |
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373 | } |
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374 | } |
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