1 | #include <assert.h> |
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2 | #include <stdlib.h> |
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3 | #include <stdio.h> |
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4 | #include <string.h> |
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5 | |
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6 | #include "abac_list.h" |
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7 | #include "abac_util.h" |
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8 | |
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9 | #include "abac_pl.h" |
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10 | |
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11 | static int debug=0; |
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12 | |
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13 | struct _abac_role_t { |
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14 | char *principal_name; |
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15 | |
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16 | char *linked_role_name; |
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17 | abac_param_list_t *linked_role_params; |
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18 | |
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19 | char *role_name; |
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20 | abac_param_list_t *role_params; |
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21 | |
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22 | char *string; |
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23 | char *linked; |
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24 | |
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25 | abac_list_t *prereqs; |
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26 | |
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27 | int refcount; |
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28 | }; |
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29 | |
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30 | extern char *abac_cn_with_sha(char*); |
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31 | char *abac_role_string_with_condition(abac_role_t *); |
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32 | char *abac_role_principal_cn(abac_role_t *); |
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33 | |
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34 | /** |
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35 | * Create a new principal and initialize it. |
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36 | */ |
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37 | abac_role_t *abac_role_principal_new(char *principal) { |
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38 | assert(principal != NULL); |
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39 | |
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40 | abac_role_t *role; |
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41 | |
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42 | if (strlen(principal) == 0) |
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43 | return NULL; |
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44 | |
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45 | role = abac_xmalloc(sizeof(abac_role_t)); |
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46 | |
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47 | role->principal_name = abac_xstrdup(principal); |
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48 | |
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49 | role->role_name = NULL; |
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50 | role->role_params = NULL; |
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51 | |
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52 | role->linked_role_name = NULL; |
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53 | role->linked_role_params = NULL; |
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54 | |
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55 | role->string = abac_xstrdup(principal); |
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56 | role->linked = NULL; |
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57 | role->prereqs = NULL; |
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58 | |
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59 | role->refcount = 1; |
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60 | |
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61 | return role; |
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62 | } |
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63 | |
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64 | /** |
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65 | * Create a new role and initialize it. |
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66 | */ |
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67 | abac_role_t *abac_role_role_new(char *principal_name, char *role_name) { |
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68 | assert(principal_name != NULL); |
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69 | assert(role_name != NULL); |
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70 | |
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71 | abac_role_t *role; |
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72 | |
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73 | if (strlen(principal_name) == 0 || strlen(role_name) == 0) |
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74 | return NULL; |
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75 | |
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76 | /* MEI */ |
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77 | if(debug) |
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78 | printf("DEBUG:adding a new role (%s) to principal (%s)\n", role_name, principal_name); |
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79 | |
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80 | role = abac_xmalloc(sizeof(abac_role_t)); |
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81 | |
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82 | role->principal_name = abac_xstrdup(principal_name); |
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83 | role->role_name = abac_xstrdup(role_name); |
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84 | role->role_params = NULL; |
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85 | |
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86 | role->linked_role_name = NULL; |
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87 | role->linked_role_params = NULL; |
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88 | |
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89 | int prin_len = strlen(principal_name); |
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90 | int role_len = strlen(role_name); |
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91 | |
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92 | role->string = abac_xmalloc(prin_len + 1 + role_len + 1); |
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93 | memcpy(role->string, principal_name, prin_len); |
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94 | role->string[prin_len] = '.'; |
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95 | memcpy(role->string + prin_len + 1, role_name, role_len); |
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96 | role->string[prin_len + 1 + role_len] = 0; |
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97 | |
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98 | |
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99 | role->linked = NULL; |
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100 | role->prereqs = NULL; |
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101 | |
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102 | role->refcount = 1; |
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103 | |
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104 | return role; |
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105 | } |
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106 | |
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107 | /** |
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108 | * Created a new linking role and initialize it. |
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109 | */ |
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110 | abac_role_t *abac_role_linking_new(char *principal_name, char *linked_role_name, char *role_name) { |
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111 | assert(principal_name != NULL); |
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112 | assert(linked_role_name != NULL); |
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113 | assert(role_name != NULL); |
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114 | |
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115 | abac_role_t *role; |
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116 | |
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117 | if (strlen(principal_name) == 0 || strlen(linked_role_name) == 0 || strlen(role_name) == 0) |
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118 | return NULL; |
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119 | |
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120 | /* MEI */ |
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121 | if(debug) |
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122 | printf("DEBUG:adding a new linked (%s) to role(%s) for principal(%s)\n", |
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123 | linked_role_name, role_name, principal_name); |
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124 | |
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125 | role = abac_xmalloc(sizeof(abac_role_t)); |
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126 | |
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127 | role->principal_name = abac_xstrdup(principal_name); |
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128 | |
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129 | role->linked_role_name = abac_xstrdup(linked_role_name); |
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130 | role->linked_role_params = NULL; |
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131 | role->role_name = abac_xstrdup(role_name); |
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132 | role->role_params = NULL; |
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133 | |
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134 | int prin_len = strlen(principal_name); |
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135 | int link_len = strlen(linked_role_name); |
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136 | int role_len = strlen(role_name); |
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137 | |
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138 | role->string = abac_xmalloc(prin_len + 1 + link_len + 1 + role_len + 1); |
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139 | |
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140 | memcpy(role->string, principal_name, prin_len); |
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141 | role->string[prin_len] = '.'; |
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142 | memcpy(role->string + prin_len + 1, linked_role_name, link_len); |
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143 | role->string[prin_len + 1 + link_len] = 0; |
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144 | |
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145 | // hack: linked role is first two parts of full string |
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146 | role->linked = abac_xstrdup(role->string); |
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147 | |
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148 | role->string[prin_len + 1 + link_len] = '.'; |
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149 | memcpy(role->string + prin_len + 1 + link_len + 1, role_name, role_len); |
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150 | role->string[prin_len + 1 + link_len + 1 + role_len] = 0; |
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151 | |
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152 | role->prereqs = NULL; |
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153 | role->refcount = 1; |
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154 | |
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155 | return role; |
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156 | } |
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157 | |
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158 | /** |
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159 | * Create an intersection role. |
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160 | */ |
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161 | abac_role_t *abac_role_intersection_new(char *name, abac_list_t *prereqs) { |
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162 | abac_role_t *role = abac_xmalloc(sizeof(abac_role_t)); |
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163 | |
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164 | role->principal_name = role->linked_role_name = role->role_name = NULL; |
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165 | role->linked_role_params = NULL; |
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166 | role->role_params = NULL; |
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167 | |
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168 | role->linked = NULL; |
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169 | role->string = abac_xstrdup(name); |
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170 | role->prereqs = prereqs; |
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171 | |
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172 | role->refcount = 1; |
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173 | |
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174 | return role; |
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175 | } |
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176 | |
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177 | /** |
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178 | * Decrease a role's reference count, freeing it when it reaches 0. |
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179 | */ |
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180 | void abac_role_free(abac_role_t *role) { |
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181 | |
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182 | if(debug) |
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183 | printf("DEBUG:trying to freeing a role %d\n",(int)role); |
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184 | |
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185 | if (role == NULL) |
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186 | return; |
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187 | |
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188 | if(debug) |
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189 | printf("DEBUG:freeing a role %d\n",(int)role); |
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190 | |
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191 | --role->refcount; |
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192 | if (role->refcount > 0) |
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193 | return; |
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194 | |
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195 | if(role->principal_name) free(role->principal_name); |
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196 | if(role->linked_role_name) free(role->linked_role_name); |
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197 | if(role->role_name) free(role->role_name); |
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198 | |
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199 | if(role->string) free(role->string); |
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200 | if(role->linked) free(role->linked); |
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201 | |
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202 | if (role->role_params != NULL) { |
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203 | abac_param_list_free(role->role_params); |
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204 | } |
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205 | |
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206 | if (role->linked_role_params != NULL) { |
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207 | abac_param_list_free(role->linked_role_params); |
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208 | } |
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209 | |
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210 | if (role->prereqs != NULL) { |
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211 | abac_role_t *cur; |
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212 | abac_list_foreach(role->prereqs, cur, |
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213 | abac_role_free(cur); |
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214 | ); |
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215 | abac_list_free(role->prereqs); |
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216 | } |
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217 | |
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218 | free(role); |
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219 | } |
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220 | |
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221 | abac_role_t *abac_role_role_add_param(abac_role_t *role, abac_term_t *param) |
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222 | { |
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223 | if(role->role_params == NULL) { |
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224 | role->role_params=abac_param_list_new(param); |
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225 | } else { |
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226 | abac_param_list_add_term(role->role_params, param); |
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227 | } |
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228 | return role; |
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229 | } |
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230 | |
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231 | abac_role_t *abac_role_add_intersecting_role(abac_role_t *role, abac_role_t *nrole) |
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232 | { |
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233 | abac_list_add(role->prereqs, nrole); |
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234 | return role; |
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235 | } |
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236 | |
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237 | abac_role_t *abac_role_role_add_linked_param(abac_role_t *role, abac_term_t *param) |
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238 | { |
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239 | if(role->linked_role_params == NULL) { |
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240 | role->linked_role_params=abac_param_list_new(param); |
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241 | } else { |
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242 | abac_param_list_add_term(role->linked_role_params, param); |
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243 | } |
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244 | return role; |
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245 | } |
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246 | |
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247 | |
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248 | /** |
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249 | * Create a non-intersecting role from a string. Handles principals, roles, |
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250 | * and linking roles. |
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251 | */ |
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252 | static abac_role_t *_abac_single_role_from_string(char *string) { |
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253 | int num_dots = 0; |
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254 | char *dot = string; |
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255 | abac_role_t *ret = NULL; |
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256 | |
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257 | // count the dots |
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258 | while ((dot = strchr(dot, '.')) != NULL) { |
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259 | ++num_dots; |
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260 | ++dot; |
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261 | } |
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262 | |
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263 | // no dots: easy case, principal |
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264 | if (num_dots == 0) |
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265 | ret = abac_role_principal_new(string); |
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266 | |
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267 | // a role has exactly 1 dot |
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268 | else if (num_dots == 1) { |
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269 | char *principal = string; |
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270 | |
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271 | // terminate the principal part |
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272 | dot = strchr(principal, '.'); |
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273 | *dot = 0; |
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274 | |
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275 | // role name comes after the dot |
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276 | char *role_name = dot + 1; |
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277 | |
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278 | // create the role (if possible) |
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279 | ret = abac_role_role_new(string, role_name); |
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280 | } |
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281 | |
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282 | // a linked role has 2 dots |
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283 | else if (num_dots == 2) { |
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284 | char *principal = string; |
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285 | |
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286 | // terminate the principal part |
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287 | dot = strchr(principal, '.'); |
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288 | *dot = 0; |
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289 | |
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290 | // linked name is next, terminate it |
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291 | char *linked = dot + 1; |
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292 | dot = strchr(linked, '.'); |
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293 | *dot = 0; |
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294 | |
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295 | // role name is last, already terminated |
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296 | char *role_name = dot + 1; |
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297 | |
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298 | ret = abac_role_linking_new(principal, linked, role_name); |
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299 | } |
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300 | |
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301 | // more than two dots: return NULL |
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302 | |
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303 | return ret; |
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304 | } |
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305 | |
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306 | /** |
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307 | * Create a role from a string. Handles intersecting and normal roles. |
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308 | */ |
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309 | abac_role_t *abac_role_from_string(char *string) { |
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310 | abac_list_t *prereqs = NULL; |
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311 | abac_role_t *ret = NULL, *role; |
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312 | char *roles[256]; |
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313 | int num_roles, i; |
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314 | |
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315 | char *original = string; |
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316 | |
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317 | // make a copy so we can mess with it |
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318 | string = abac_xstrdup(string); |
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319 | |
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320 | // split the string (in case of an intersection num_roles > 1) |
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321 | abac_split(string, " & ", roles, &num_roles); |
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322 | |
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323 | // normal role: |
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324 | if (num_roles == 1) |
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325 | ret = _abac_single_role_from_string(string); |
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326 | |
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327 | else { |
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328 | prereqs = abac_list_new(); |
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329 | |
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330 | for (i = 0; i < num_roles; ++i) { |
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331 | // make sure the tail role is valid |
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332 | role = abac_role_from_string(roles[i]); |
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333 | if (role == NULL) |
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334 | goto error; |
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335 | |
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336 | abac_list_add(prereqs, role); |
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337 | } |
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338 | ret = abac_role_intersection_new(original, prereqs); |
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339 | } |
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340 | |
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341 | free(string); |
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342 | return ret; |
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343 | |
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344 | error: |
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345 | |
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346 | if (prereqs != NULL) { |
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347 | abac_role_t *cur; |
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348 | abac_list_foreach(prereqs, cur, |
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349 | abac_role_free(cur); |
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350 | ); |
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351 | abac_list_free(prereqs); |
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352 | } |
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353 | free(string); |
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354 | return NULL; |
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355 | } |
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356 | |
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357 | |
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358 | /** |
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359 | * Increase a role's reference count. |
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360 | */ |
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361 | abac_role_t *abac_role_dup(abac_role_t *role) { |
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362 | assert(role != NULL); |
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363 | |
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364 | ++role->refcount; |
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365 | return role; |
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366 | } |
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367 | |
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368 | /** |
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369 | * True if a role is a principal. |
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370 | */ |
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371 | int abac_role_is_principal(abac_role_t *role) { |
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372 | assert(role != NULL); |
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373 | return role->role_name == NULL && role->linked_role_name == NULL && role->prereqs == NULL; |
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374 | } |
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375 | |
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376 | /** |
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377 | * True if a role is a role. |
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378 | */ |
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379 | int abac_role_is_role(abac_role_t *role) { |
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380 | assert(role != NULL); |
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381 | return role->role_name != NULL && role->linked_role_name == NULL && role->prereqs == NULL; |
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382 | } |
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383 | |
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384 | /** |
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385 | * True if a role is a linked role. |
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386 | */ |
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387 | int abac_role_is_linking(abac_role_t *role) { |
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388 | assert(role != NULL); |
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389 | return role->linked_role_name != NULL; |
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390 | } |
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391 | |
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392 | /** |
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393 | * True if a role is an intersection. |
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394 | */ |
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395 | int abac_role_is_intersection(abac_role_t *role) { |
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396 | assert(role != NULL); |
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397 | return role->prereqs != NULL; |
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398 | } |
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399 | |
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400 | char *abac_role_intersecting_string_with_condition(abac_role_t *role) |
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401 | { |
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402 | assert(role != NULL); |
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403 | char *tmp=NULL; |
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404 | if (role->prereqs != NULL) { |
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405 | abac_role_t *cur; |
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406 | abac_list_foreach(role->prereqs, cur, |
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407 | char *ntmp=abac_role_string_with_condition(cur); |
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408 | if(tmp==NULL) { |
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409 | asprintf(&tmp,"%s",ntmp); |
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410 | } else { |
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411 | asprintf(&tmp,"%s & %s",tmp, ntmp); |
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412 | } |
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413 | ); |
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414 | } |
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415 | return tmp; |
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416 | } |
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417 | /** |
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418 | * Returns the string representation of the role. |
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419 | * principal.role(params..) |
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420 | */ |
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421 | char *abac_role_string_with_condition(abac_role_t *role) { |
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422 | assert(role != NULL); |
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423 | |
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424 | if(abac_role_is_intersection(role)) { |
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425 | return abac_role_intersecting_string_with_condition(role); |
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426 | } |
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427 | |
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428 | char *tmp=NULL; |
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429 | /* use cn for now, easy to debug XXX */ |
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430 | char *principal_name = abac_role_principal_cn(role); |
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431 | char *role_name= role->role_name; |
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432 | char *linked_role_name = role->linked_role_name; |
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433 | char *params_string=NULL; |
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434 | char *linked_params_string=NULL; |
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435 | |
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436 | int len = 0; |
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437 | if(principal_name) |
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438 | len=len+strlen(principal_name)+1; |
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439 | if(role_name) |
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440 | len = len+strlen(role_name)+1; |
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441 | if(linked_role_name) |
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442 | len = len+strlen(linked_role_name)+1; |
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443 | |
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444 | if(role->role_params) { |
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445 | params_string=abac_param_list_string_with_condition(role->role_params); |
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446 | len = len+strlen(params_string)+3; |
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447 | } |
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448 | if(role->linked_role_params) { |
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449 | linked_params_string=abac_param_list_string_with_condition(role->linked_role_params); |
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450 | len = len+strlen(linked_params_string)+3; |
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451 | } |
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452 | |
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453 | /* principal */ |
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454 | /* principal.role */ |
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455 | /* principal.role(params_string) */ |
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456 | /* principal.linked_role(linked_params_string).role(params_string) */ |
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457 | tmp = abac_xmalloc(len); |
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458 | |
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459 | if(principal_name) |
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460 | sprintf(tmp,"%s",principal_name); |
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461 | |
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462 | if(linked_role_name) { |
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463 | strcat(tmp,"."); |
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464 | strcat(tmp,linked_role_name); |
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465 | } |
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466 | if(linked_params_string) { |
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467 | strcat(tmp,"("); |
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468 | strcat(tmp,linked_params_string); |
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469 | strcat(tmp,")"); |
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470 | } |
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471 | if(role_name) { |
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472 | strcat(tmp,"."); |
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473 | strcat(tmp,role_name); |
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474 | } |
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475 | if(params_string) { |
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476 | strcat(tmp,"("); |
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477 | strcat(tmp,params_string); |
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478 | strcat(tmp,")"); |
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479 | } |
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480 | |
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481 | if(linked_params_string) free(linked_params_string); |
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482 | if(params_string) free(params_string); |
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483 | return tmp; |
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484 | } |
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485 | |
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486 | void abac_print_role_string_with_condition(abac_role_t *role,FILE *fp) |
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487 | { |
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488 | char *string=abac_role_string_with_condition(role); |
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489 | if(fp==NULL) |
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490 | printf("%s",string); |
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491 | else fprintf(fp,"%s",string); |
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492 | } |
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493 | |
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494 | /** |
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495 | * Returns the name of a role. If the role is A.r1 then return r1. If the role |
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496 | * is A.r1.r2 then return r2. |
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497 | */ |
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498 | char *abac_role_role_name(abac_role_t *role) { |
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499 | assert(role != NULL); |
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500 | return role->role_name; |
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501 | } |
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502 | |
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503 | char *abac_role_role_param_string(abac_role_t *role) { |
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504 | assert(role != NULL); |
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505 | if(role->role_params) { |
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506 | return abac_param_list_string(role->role_params); |
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507 | } |
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508 | return NULL; |
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509 | } |
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510 | |
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511 | /** |
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512 | * Returns the linked part of a linking role. For instance, if the role is |
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513 | * A.r1.r2, this returns A.r1. |
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514 | */ |
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515 | char *abac_role_linked_role(abac_role_t *role) { |
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516 | assert(role != NULL); |
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517 | return role->linked_role_name; |
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518 | } |
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519 | |
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520 | /** |
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521 | * Returns the principal part of a role. The stuff before the first dot. |
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522 | */ |
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523 | char *abac_role_principal(abac_role_t *role) { |
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524 | assert(role != NULL); |
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525 | return role->principal_name; |
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526 | } |
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527 | |
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528 | char *abac_role_principal_cn(abac_role_t *role) { |
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529 | assert(role != NULL); |
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530 | return abac_cn_with_sha(role->principal_name); |
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531 | } |
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532 | |
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533 | /** |
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534 | * Returns the prereqs of an intersection. |
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535 | */ |
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536 | abac_list_t *abac_role_prereqs(abac_role_t *role) { |
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537 | assert(role != NULL); |
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538 | return role->prereqs; |
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539 | } |
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540 | |
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541 | abac_param_list_t *abac_role_linked_role_params(abac_role_t *role) { |
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542 | assert(role != NULL); |
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543 | return role->linked_role_params; |
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544 | } |
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545 | |
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546 | abac_param_list_t *abac_role_role_params(abac_role_t *role) { |
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547 | assert(role != NULL); |
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548 | return role->role_params; |
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549 | } |
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550 | |
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551 | |
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552 | /** |
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553 | * Build an attribute key from head and tail roles. Static. |
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554 | */ |
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555 | #define ROLE_SEPARATOR " <- " |
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556 | char *abac_role_attr_key(abac_role_t *head_role, abac_role_t *tail_role) { |
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557 | char *head = abac_role_string_with_condition(head_role); |
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558 | int head_len = strlen(head); |
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559 | |
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560 | char *tail = abac_role_string_with_condition(tail_role); |
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561 | int tail_len = strlen(tail); |
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562 | |
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563 | int sep_len = sizeof(ROLE_SEPARATOR) - 1; |
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564 | |
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565 | // "head <- tail" |
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566 | char *ret = abac_xmalloc(head_len + tail_len + sep_len + 1); |
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567 | memcpy(ret, head, head_len); |
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568 | memcpy(ret + head_len, ROLE_SEPARATOR, sep_len); |
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569 | memcpy(ret + head_len + sep_len, tail, tail_len); |
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570 | ret[head_len + sep_len + tail_len] = 0; |
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571 | |
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572 | return ret; |
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573 | } |
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