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 | |
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31 | /** |
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32 | * Create a new principal and initialize it. |
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33 | */ |
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34 | abac_role_t *abac_role_principal_new(char *principal_name) { |
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35 | assert(principal_name != NULL); |
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36 | |
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37 | abac_role_t *role; |
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38 | |
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39 | if (strlen(principal_name) == 0) |
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40 | return NULL; |
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41 | |
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42 | role = abac_xmalloc(sizeof(abac_role_t)); |
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43 | |
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44 | role->principal_name = abac_xstrdup(principal_name); |
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45 | |
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46 | role->role_name = NULL; |
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47 | role->role_params = NULL; |
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48 | |
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49 | role->linked_role_name = NULL; |
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50 | role->linked_role_params = NULL; |
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51 | |
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52 | role->string = abac_xstrdup(role->principal_name); |
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53 | role->linked = NULL; |
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54 | role->prereqs = NULL; |
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55 | |
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56 | role->refcount = 1; |
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57 | |
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58 | return role; |
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59 | } |
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60 | |
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61 | /** |
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62 | * Create a new role and initialize it. |
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63 | */ |
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64 | abac_role_t *abac_role_role_new(char *principal_name, char *role_name) { |
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65 | assert(principal_name != NULL); |
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66 | assert(role_name != NULL); |
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67 | |
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68 | abac_role_t *role; |
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69 | |
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70 | if (strlen(principal_name) == 0 || strlen(role_name) == 0) |
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71 | return NULL; |
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72 | |
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73 | role = abac_xmalloc(sizeof(abac_role_t)); |
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74 | |
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75 | role->principal_name = abac_xstrdup(principal_name); |
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76 | |
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77 | role->role_name = abac_xstrdup(role_name); |
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78 | role->role_params = NULL; |
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79 | |
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80 | role->linked_role_name = NULL; |
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81 | role->linked_role_params = NULL; |
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82 | |
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83 | int prin_len = strlen(principal_name); |
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84 | int role_len = strlen(role_name); |
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85 | |
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86 | if(debug) |
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87 | printf("DEBUG:adding a new role (%s) to principal (%s)\n", |
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88 | role->role_name, role->principal_name); |
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89 | |
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90 | role->string = abac_xmalloc(prin_len + 1 + role_len + 1); |
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91 | memcpy(role->string, principal_name, prin_len); |
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92 | role->string[prin_len] = '.'; |
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93 | memcpy(role->string + prin_len + 1, role_name, role_len); |
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94 | role->string[prin_len + 1 + role_len] = 0; |
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95 | |
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96 | |
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97 | role->linked = NULL; |
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98 | role->prereqs = NULL; |
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99 | |
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100 | role->refcount = 1; |
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101 | |
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102 | return role; |
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103 | } |
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104 | |
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105 | /** |
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106 | * Created a new linking role and initialize it. |
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107 | */ |
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108 | abac_role_t *abac_role_linking_new(char *principal_name, char *linked_role_name, char *role_name) { |
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109 | assert(principal_name != NULL); |
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110 | assert(linked_role_name != NULL); |
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111 | assert(role_name != NULL); |
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112 | |
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113 | abac_role_t *role; |
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114 | |
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115 | if (strlen(principal_name) == 0 || strlen(linked_role_name) == 0 || strlen(role_name) == 0) |
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116 | return NULL; |
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117 | |
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118 | role = abac_xmalloc(sizeof(abac_role_t)); |
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119 | |
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120 | role->principal_name = abac_xstrdup(principal_name); |
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121 | role->linked_role_name = abac_xstrdup(linked_role_name); |
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122 | role->linked_role_params = NULL; |
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123 | role->role_name = abac_xstrdup(role_name); |
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124 | role->role_params = NULL; |
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125 | |
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126 | /* MEI */ |
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127 | if(debug) |
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128 | printf("DEBUG:adding a new linked (%s) to role(%s) for principal(%s)\n", |
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129 | role->linked_role_name, role->role_name, role->principal_name); |
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130 | |
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131 | int prin_len = strlen(role->principal_name); |
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132 | int link_len = strlen(linked_role_name); |
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133 | int role_len = strlen(role_name); |
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134 | |
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135 | role->string = abac_xmalloc(prin_len + 1 + link_len + 1 + role_len + 1); |
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136 | |
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137 | memcpy(role->string, role->principal_name, prin_len); |
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138 | role->string[prin_len] = '.'; |
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139 | memcpy(role->string + prin_len + 1, linked_role_name, link_len); |
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140 | role->string[prin_len + 1 + link_len] = 0; |
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141 | |
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142 | // hack: linked role is first two parts of full string |
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143 | role->linked = abac_xstrdup(role->string); |
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144 | |
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145 | role->string[prin_len + 1 + link_len] = '.'; |
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146 | memcpy(role->string + prin_len + 1 + link_len + 1, role_name, role_len); |
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147 | role->string[prin_len + 1 + link_len + 1 + role_len] = 0; |
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148 | |
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149 | role->prereqs = NULL; |
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150 | role->refcount = 1; |
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151 | |
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152 | return role; |
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153 | } |
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154 | |
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155 | /** |
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156 | * Create an intersection role. |
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157 | */ |
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158 | abac_role_t *abac_role_intersection_new(char *name, abac_list_t *prereqs) { |
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159 | abac_role_t *role = abac_xmalloc(sizeof(abac_role_t)); |
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160 | |
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161 | role->principal_name = role->linked_role_name = role->role_name = NULL; |
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162 | role->linked_role_params = NULL; |
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163 | role->role_params = NULL; |
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164 | |
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165 | role->linked = NULL; |
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166 | role->string = abac_xstrdup(name); |
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167 | role->prereqs = prereqs; |
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168 | |
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169 | role->refcount = 1; |
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170 | |
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171 | return role; |
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172 | } |
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173 | |
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174 | /** |
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175 | * Decrease a role's reference count, freeing it when it reaches 0. |
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176 | */ |
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177 | void abac_role_free(abac_role_t *role) { |
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178 | |
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179 | if(debug) |
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180 | printf("DEBUG:trying to freeing a role %d\n",(int)role); |
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181 | |
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182 | if (role == NULL) |
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183 | return; |
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184 | |
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185 | if(debug) |
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186 | printf("DEBUG:freeing a role %d\n",(int)role); |
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187 | |
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188 | --role->refcount; |
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189 | if (role->refcount > 0) |
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190 | return; |
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191 | |
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192 | if(role->principal_name) free(role->principal_name); |
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193 | if(role->linked_role_name) free(role->linked_role_name); |
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194 | if(role->role_name) free(role->role_name); |
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195 | |
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196 | if(role->string) free(role->string); |
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197 | if(role->linked) free(role->linked); |
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198 | |
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199 | if (role->role_params != NULL) { |
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200 | abac_param_list_free(role->role_params); |
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201 | } |
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202 | |
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203 | if (role->linked_role_params != NULL) { |
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204 | abac_param_list_free(role->linked_role_params); |
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205 | } |
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206 | |
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207 | if (role->prereqs != NULL) { |
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208 | abac_role_t *cur; |
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209 | abac_list_foreach(role->prereqs, cur, |
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210 | abac_role_free(cur); |
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211 | ); |
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212 | abac_list_free(role->prereqs); |
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213 | } |
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214 | |
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215 | free(role); |
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216 | } |
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217 | |
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218 | abac_role_t *abac_role_role_add_param(abac_role_t *role, abac_term_t *param) |
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219 | { |
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220 | if(role->role_params == NULL) { |
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221 | role->role_params=abac_param_list_new(param); |
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222 | } else { |
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223 | abac_param_list_add_term(role->role_params, param); |
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224 | } |
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225 | return role; |
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226 | } |
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227 | |
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228 | abac_role_t *abac_role_add_intersecting_role(abac_role_t *role, abac_role_t *nrole) |
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229 | { |
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230 | abac_list_add(role->prereqs, nrole); |
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231 | return role; |
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232 | } |
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233 | |
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234 | abac_role_t *abac_role_role_add_linked_param(abac_role_t *role, abac_term_t *param) |
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235 | { |
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236 | if(role->linked_role_params == NULL) { |
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237 | role->linked_role_params=abac_param_list_new(param); |
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238 | } else { |
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239 | abac_param_list_add_term(role->linked_role_params, param); |
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240 | } |
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241 | return role; |
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242 | } |
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243 | |
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244 | |
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245 | /** |
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246 | * Create a non-intersecting role from a string. Handles principals, roles, |
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247 | * and linking roles. |
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248 | */ |
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249 | static abac_role_t *_abac_single_role_from_string(char *string) { |
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250 | int num_dots = 0; |
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251 | char *dot = string; |
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252 | abac_role_t *ret = NULL; |
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253 | |
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254 | // count the dots |
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255 | while ((dot = strchr(dot, '.')) != NULL) { |
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256 | ++num_dots; |
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257 | ++dot; |
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258 | } |
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259 | |
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260 | // no dots: easy case, principal |
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261 | if (num_dots == 0) |
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262 | ret = abac_role_principal_new(string); |
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263 | |
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264 | // a role has exactly 1 dot |
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265 | else if (num_dots == 1) { |
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266 | char *principal = string; |
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267 | |
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268 | // terminate the principal part |
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269 | dot = strchr(principal, '.'); |
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270 | *dot = 0; |
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271 | |
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272 | // role name comes after the dot |
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273 | char *role_name = dot + 1; |
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274 | |
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275 | // create the role (if possible) |
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276 | ret = abac_role_role_new(string, role_name); |
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277 | } |
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278 | |
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279 | // a linked role has 2 dots |
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280 | else if (num_dots == 2) { |
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281 | char *principal = string; |
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282 | |
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283 | // terminate the principal part |
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284 | dot = strchr(principal, '.'); |
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285 | *dot = 0; |
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286 | |
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287 | // linked name is next, terminate it |
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288 | char *linked = dot + 1; |
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289 | dot = strchr(linked, '.'); |
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290 | *dot = 0; |
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291 | |
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292 | // role name is last, already terminated |
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293 | char *role_name = dot + 1; |
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294 | |
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295 | ret = abac_role_linking_new(principal, linked, role_name); |
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296 | } |
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297 | |
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298 | // more than two dots: return NULL |
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299 | |
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300 | return ret; |
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301 | } |
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302 | |
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303 | /** |
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304 | * Create a role from a string. Handles intersecting and normal roles. |
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305 | */ |
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306 | abac_role_t *abac_role_from_string(char *string) { |
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307 | abac_list_t *prereqs = NULL; |
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308 | abac_role_t *ret = NULL, *role; |
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309 | char *roles[256]; |
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310 | int num_roles, i; |
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311 | |
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312 | char *original = string; |
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313 | |
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314 | // make a copy so we can mess with it |
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315 | string = abac_xstrdup(string); |
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316 | |
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317 | // split the string (in case of an intersection num_roles > 1) |
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318 | abac_split(string, " & ", roles, &num_roles); |
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319 | |
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320 | // normal role: |
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321 | if (num_roles == 1) |
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322 | ret = _abac_single_role_from_string(string); |
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323 | |
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324 | else { |
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325 | prereqs = abac_list_new(); |
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326 | |
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327 | for (i = 0; i < num_roles; ++i) { |
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328 | // make sure the tail role is valid |
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329 | role = abac_role_from_string(roles[i]); |
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330 | if (role == NULL) |
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331 | goto error; |
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332 | |
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333 | abac_list_add(prereqs, role); |
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334 | } |
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335 | ret = abac_role_intersection_new(original, prereqs); |
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336 | } |
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337 | |
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338 | free(string); |
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339 | return ret; |
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340 | |
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341 | error: |
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342 | |
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343 | if (prereqs != NULL) { |
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344 | abac_role_t *cur; |
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345 | abac_list_foreach(prereqs, cur, |
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346 | abac_role_free(cur); |
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347 | ); |
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348 | abac_list_free(prereqs); |
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349 | } |
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350 | free(string); |
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351 | return NULL; |
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352 | } |
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353 | |
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354 | |
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355 | /** |
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356 | * Increase a role's reference count. |
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357 | */ |
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358 | abac_role_t *abac_role_dup(abac_role_t *role) { |
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359 | assert(role != NULL); |
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360 | |
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361 | ++role->refcount; |
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362 | return role; |
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363 | } |
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364 | |
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365 | /** |
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366 | * True if a role is a principal. |
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367 | */ |
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368 | int abac_role_is_principal(abac_role_t *role) { |
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369 | assert(role != NULL); |
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370 | return role->role_name == NULL && role->linked_role_name == NULL && role->prereqs == NULL; |
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371 | } |
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372 | |
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373 | /** |
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374 | * True if a role is a role. |
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375 | */ |
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376 | int abac_role_is_role(abac_role_t *role) { |
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377 | assert(role != NULL); |
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378 | return role->role_name != NULL && role->linked_role_name == NULL && role->prereqs == NULL; |
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379 | } |
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380 | |
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381 | /** |
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382 | * True if a role is a linked role. |
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383 | */ |
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384 | int abac_role_is_linking(abac_role_t *role) { |
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385 | assert(role != NULL); |
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386 | return role->linked_role_name != NULL; |
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387 | } |
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388 | |
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389 | /** |
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390 | * True if a role is an intersection. |
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391 | */ |
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392 | int abac_role_is_intersection(abac_role_t *role) { |
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393 | assert(role != NULL); |
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394 | return role->prereqs != NULL; |
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395 | } |
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396 | |
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397 | char *abac_role_intersecting_string_with_condition(abac_role_t *role) |
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398 | { |
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399 | assert(role != NULL); |
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400 | char *tmp=NULL; |
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401 | if (role->prereqs != NULL) { |
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402 | abac_role_t *cur; |
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403 | abac_list_foreach(role->prereqs, cur, |
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404 | char *ntmp=abac_role_string_with_condition(cur); |
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405 | if(tmp==NULL) { |
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406 | asprintf(&tmp,"%s",ntmp); |
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407 | } else { |
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408 | asprintf(&tmp,"%s & %s",tmp, ntmp); |
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409 | } |
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410 | ); |
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411 | } |
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412 | return tmp; |
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413 | } |
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414 | /** |
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415 | * Returns the string representation of the role. |
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416 | * principal.role(params..) |
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417 | */ |
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418 | char *abac_role_string_with_condition(abac_role_t *role) { |
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419 | assert(role != NULL); |
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420 | |
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421 | if(abac_role_is_intersection(role)) { |
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422 | return abac_role_intersecting_string_with_condition(role); |
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423 | } |
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424 | |
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425 | char *tmp=NULL; |
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426 | char *principal_name = abac_role_principal_name(role); |
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427 | char *role_name= role->role_name; |
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428 | char *linked_role_name = role->linked_role_name; |
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429 | char *params_string=NULL; |
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430 | char *linked_params_string=NULL; |
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431 | |
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432 | int len = 0; |
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433 | if(principal_name) |
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434 | len=len+strlen(principal_name)+1; |
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435 | if(role_name) |
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436 | len = len+strlen(role_name)+1; |
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437 | if(linked_role_name) |
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438 | len = len+strlen(linked_role_name)+1; |
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439 | |
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440 | if(role->role_params) { |
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441 | params_string=abac_param_list_string_with_condition(role->role_params); |
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442 | len = len+strlen(params_string)+3; |
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443 | } |
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444 | if(role->linked_role_params) { |
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445 | linked_params_string=abac_param_list_string_with_condition(role->linked_role_params); |
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446 | len = len+strlen(linked_params_string)+3; |
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447 | } |
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448 | |
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449 | /* principal */ |
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450 | /* principal.role */ |
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451 | /* principal.role(params_string) */ |
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452 | /* principal.linked_role(linked_params_string).role(params_string) */ |
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453 | tmp = abac_xmalloc(len); |
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454 | |
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455 | if(principal_name) |
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456 | sprintf(tmp,"%s",principal_name); |
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457 | |
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458 | if(linked_role_name) { |
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459 | strcat(tmp,"."); |
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460 | strcat(tmp,linked_role_name); |
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461 | } |
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462 | if(linked_params_string) { |
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463 | strcat(tmp,"("); |
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464 | strcat(tmp,linked_params_string); |
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465 | strcat(tmp,")"); |
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466 | } |
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467 | if(role_name) { |
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468 | strcat(tmp,"."); |
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469 | strcat(tmp,role_name); |
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470 | } |
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471 | if(params_string) { |
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472 | strcat(tmp,"("); |
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473 | strcat(tmp,params_string); |
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474 | strcat(tmp,")"); |
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475 | } |
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476 | |
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477 | if(linked_params_string) free(linked_params_string); |
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478 | if(params_string) free(params_string); |
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479 | return tmp; |
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480 | } |
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481 | char *abac_role_string(abac_role_t *role) { |
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482 | abac_role_string_with_condition(role); |
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483 | } |
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484 | |
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485 | void abac_print_role_string_with_condition(abac_role_t *role,FILE *fp) |
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486 | { |
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487 | char *string=abac_role_string_with_condition(role); |
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488 | if(fp==NULL) |
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489 | printf("%s ",string); |
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490 | else fprintf(fp,"%s ",string); |
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491 | } |
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492 | |
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493 | /** |
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494 | * Returns the name of a role. If the role is A.r1 then return r1. If the role |
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495 | * is A.r1.r2 then return r2. |
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496 | */ |
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497 | char *abac_role_role_name(abac_role_t *role) { |
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498 | assert(role != NULL); |
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499 | return role->role_name; |
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500 | } |
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501 | |
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502 | char *abac_role_role_param_string(abac_role_t *role) { |
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503 | assert(role != NULL); |
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504 | if(role->role_params) { |
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505 | return abac_param_list_string(role->role_params); |
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506 | } |
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507 | return NULL; |
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508 | } |
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509 | |
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510 | /** |
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511 | * Returns the linked part of a linking role. For instance, if the role is |
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512 | * A.r1.r2, this returns A.r1. |
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513 | */ |
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514 | char *abac_role_linked_role(abac_role_t *role) { |
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515 | assert(role != NULL); |
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516 | return role->linked_role_name; |
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517 | } |
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518 | |
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519 | /** |
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520 | * Returns the principal part of a role. The stuff before the first dot. |
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521 | */ |
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522 | char *abac_role_principal_principalname(abac_role_t *role) { |
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523 | assert(role != NULL); |
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524 | return role->principal_name; |
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525 | } |
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526 | |
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527 | char *abac_role_principal_name(abac_role_t *role) { |
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528 | assert(role != NULL); |
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529 | if(USE("ABAC_CN")) |
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530 | return abac_cn_with_sha(role->principal_name); |
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531 | return role->principal_name; |
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532 | } |
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533 | |
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534 | char *abac_role_principal_cn(abac_role_t *role) { |
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535 | assert(role != NULL); |
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536 | return abac_cn_with_sha(role->principal_name); |
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537 | } |
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538 | |
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539 | /** |
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540 | * Returns the prereqs of an intersection. |
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541 | */ |
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542 | abac_list_t *abac_role_prereqs(abac_role_t *role) { |
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543 | assert(role != NULL); |
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544 | return role->prereqs; |
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545 | } |
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546 | |
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547 | abac_param_list_t *abac_role_linked_role_params(abac_role_t *role) { |
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548 | assert(role != NULL); |
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549 | return role->linked_role_params; |
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550 | } |
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551 | |
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552 | abac_param_list_t *abac_role_role_params(abac_role_t *role) { |
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553 | assert(role != NULL); |
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554 | return role->role_params; |
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555 | } |
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556 | |
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557 | |
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558 | /** |
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559 | * Build an attribute key from head and tail roles. Static. |
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560 | */ |
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561 | #define ROLE_SEPARATOR " <- " |
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562 | char *abac_role_attr_key(abac_role_t *head_role, abac_role_t *tail_role) { |
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563 | char *head = abac_role_string_with_condition(head_role); |
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564 | int head_len = strlen(head); |
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565 | |
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566 | char *tail = abac_role_string_with_condition(tail_role); |
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567 | int tail_len = strlen(tail); |
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568 | |
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569 | int sep_len = sizeof(ROLE_SEPARATOR) - 1; |
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570 | |
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571 | // "head <- tail" |
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572 | char *ret = abac_xmalloc(head_len + tail_len + sep_len + 1); |
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573 | memcpy(ret, head, head_len); |
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574 | memcpy(ret + head_len, ROLE_SEPARATOR, sep_len); |
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575 | memcpy(ret + head_len + sep_len, tail, tail_len); |
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576 | ret[head_len + sep_len + tail_len] = 0; |
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577 | |
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578 | return ret; |
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579 | } |
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