1 | |
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2 | /***********************************************************************/ |
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3 | /* abac_pl_pre.c */ |
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4 | /* clause preprocesing called to make partial prolog clause generations*/ |
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5 | /* -> process named cred id, and constraint range/role/oset */ |
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6 | /***********************************************************************/ |
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7 | #include <stdio.h> |
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8 | #include <assert.h> |
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9 | #include <stdlib.h> |
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10 | |
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11 | #include "abac_util.h" |
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12 | |
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13 | #include "abac_pl_pre.h" |
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14 | #include "abac_term.h" |
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15 | #include "abac_aspect.h" |
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16 | #include "abac_list.h" |
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17 | #include "abac_pl_gen.h" |
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18 | #include "abac_pl_yap.h" |
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19 | |
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20 | static int debug=0; |
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21 | |
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22 | /****************************************************************/ |
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23 | /* add the range condition to constraint list */ |
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24 | /* this is for integer and float only */ |
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25 | static void _preprocess_range_numeric_constraint(abac_term_t *ptr) |
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26 | { |
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27 | assert(abac_term_constraint(ptr)); |
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28 | char *var=abac_term_name(ptr); |
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29 | char *typestr=abac_term_type_name(ptr); |
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30 | abac_condition_t *cond=abac_term_constraint(ptr); |
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31 | |
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32 | char *tmplist=NULL; |
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33 | char *tmp=NULL; |
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34 | int as_range=1; /* either , or ; */ |
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35 | |
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36 | abac_condition_set_range_string(cond); |
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37 | |
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38 | abac_list_t *rlist=abac_condition_range_list(cond); |
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39 | abac_item_t *cur; |
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40 | abac_list_foreach(rlist, cur, |
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41 | int type=abac_item_type(cur); |
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42 | char *val=abac_item_val(cur); |
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43 | switch(type) { |
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44 | case e_ITEM_MIN: |
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45 | tmp=generate_pl_range_constraint(typestr,var,val,">="); |
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46 | break; |
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47 | case e_ITEM_MAX: |
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48 | tmp=generate_pl_range_constraint(typestr,var,val,"=<"); |
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49 | break; |
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50 | case e_ITEM_TARGET: |
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51 | tmp=generate_pl_range_constraint(NULL,var,val,"="); |
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52 | as_range=0; |
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53 | break; |
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54 | } |
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55 | /* ; is prolog's disjunction built in predicate */ |
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56 | if(tmplist) { |
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57 | if(as_range) |
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58 | asprintf(&tmplist,"%s,%s",tmplist,tmp); |
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59 | else |
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60 | asprintf(&tmplist,"%s;%s",tmplist,tmp); |
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61 | } else { |
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62 | tmplist=tmp; |
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63 | } |
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64 | tmp=NULL; |
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65 | ); |
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66 | asprintf(&tmplist,"(%s)",tmplist); |
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67 | abac_pl_add_constraints(tmplist); |
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68 | } |
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69 | |
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70 | /****************************************************************/ |
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71 | /* this is for time only */ |
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72 | static void _preprocess_range_time_constraint(abac_term_t *ptr) |
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73 | { |
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74 | assert(abac_term_constraint(ptr)); |
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75 | char *var=abac_term_name(ptr); |
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76 | char *typestr=abac_term_type_name(ptr); |
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77 | abac_condition_t *cond=abac_term_constraint(ptr); |
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78 | abac_list_t *rlist=abac_condition_range_list(cond); |
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79 | assert(rlist); |
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80 | |
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81 | char *tmplist=NULL; |
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82 | char *tmp=NULL; |
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83 | char *ttmp=NULL; |
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84 | char *tlist=NULL; |
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85 | int as_range=1; /* either , or ; */ |
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86 | |
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87 | abac_condition_set_range_string(cond); |
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88 | |
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89 | abac_item_t *cur; |
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90 | /* a list of values -- in chars */ |
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91 | abac_list_foreach(rlist, cur, |
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92 | int type=abac_item_type(cur); |
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93 | char *tval=abac_item_val(cur); |
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94 | char *val=abac_term_to_time(tval); |
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95 | switch(type) { |
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96 | case e_ITEM_MIN: |
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97 | ttmp=generate_pl_range_time_constraint(var,val,">"); |
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98 | tmp=generate_pl_range_time_constraint(var,val,"="); |
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99 | asprintf(&tlist,"(%s;%s)",ttmp,tmp); |
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100 | tmp=tlist; |
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101 | break; |
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102 | case e_ITEM_MAX: |
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103 | ttmp=generate_pl_range_time_constraint(var,val,"="); |
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104 | tmp=generate_pl_range_time_constraint(var,val,"<"); |
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105 | asprintf(&tlist,"(%s;%s)",ttmp,tmp); |
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106 | tmp=tlist; |
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107 | break; |
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108 | case e_ITEM_TARGET: |
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109 | tmp=generate_pl_range_time_constraint(var,val,"="); |
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110 | as_range=0; |
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111 | break; |
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112 | } |
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113 | free(val); |
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114 | /* ; is prolog's disjunction built in predicate */ |
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115 | if(tmplist) { |
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116 | if(as_range) |
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117 | asprintf(&tmplist,"%s,%s",tmplist,tmp); |
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118 | else |
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119 | asprintf(&tmplist,"%s;%s",tmplist,tmp); |
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120 | } else { |
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121 | tmplist=tmp; |
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122 | } |
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123 | tmp=NULL; |
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124 | ); |
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125 | |
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126 | asprintf(&tmplist,"(%s)",tmplist); |
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127 | |
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128 | /* generate a clause with above and add into db */ |
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129 | tmp=abac_pl_add_range_constraint_clause(var,tmplist); |
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130 | abac_pl_add_constraints(tmp); |
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131 | } |
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132 | |
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133 | /****************************************************************/ |
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134 | /* this is for string and urn only */ |
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135 | static void _preprocess_range_string_constraint(abac_term_t *ptr) |
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136 | { |
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137 | assert(abac_term_constraint(ptr)); |
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138 | char *var=abac_term_name(ptr); |
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139 | char *typestr=abac_term_type_name(ptr); |
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140 | abac_condition_t *cond=abac_term_constraint(ptr); |
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141 | abac_list_t *rlist=abac_condition_range_list(cond); |
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142 | assert(rlist); |
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143 | |
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144 | char *tmplist=NULL; |
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145 | char *tmp=NULL; |
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146 | |
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147 | abac_condition_set_range_string(cond); |
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148 | abac_item_t *cur; |
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149 | |
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150 | /* a list of values -- in chars */ |
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151 | abac_list_foreach(rlist, cur, |
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152 | int type=abac_item_type(cur); |
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153 | char *val=abac_item_val(cur); |
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154 | switch(type) { |
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155 | case e_ITEM_MIN: |
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156 | panic("_preprocess_range_string_constraint, invalid range type - min"); |
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157 | break; |
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158 | case e_ITEM_MAX: |
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159 | /* invalid range type */ |
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160 | panic("_preprocess_range_string_constraint, invalid range type - max"); |
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161 | break; |
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162 | case e_ITEM_TARGET: |
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163 | tmp=generate_pl_range_constraint(NULL,var,val,"="); |
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164 | break; |
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165 | } |
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166 | /* ; is prolog's disjunction built in predicate */ |
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167 | if(tmplist) |
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168 | asprintf(&tmplist,"%s;%s",tmplist,tmp); |
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169 | else tmplist=tmp; |
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170 | tmp=NULL; |
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171 | ); |
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172 | asprintf(&tmplist,"(%s)",tmplist); |
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173 | /* generate a clause with above and add into db */ |
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174 | tmp=abac_pl_add_range_constraint_clause(var,tmplist); |
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175 | abac_pl_add_constraints(tmp); |
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176 | } |
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177 | |
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178 | |
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179 | /***********************************************************************/ |
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180 | void preprocess_pl_term(abac_context_t *ctxt,abac_term_t *ptr) |
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181 | { |
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182 | /* add id */ |
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183 | char *name=abac_term_name(ptr); |
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184 | char *type=abac_term_type_name(ptr); |
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185 | |
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186 | if(abac_term_type(ptr) == e_TERM_PRINCIPAL && abac_term_isnamed(ptr)) { |
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187 | int type=e_KEYID; |
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188 | abac_pl_add_id_certs(name,type); |
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189 | if(debug) fprintf(stderr,"preprocess_pl_term: adding %s to id_certs\n",name); |
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190 | } |
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191 | |
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192 | abac_condition_t *cond=abac_term_constraint(ptr); |
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193 | if(cond != NULL) { |
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194 | if(abac_condition_is_range(cond)) { |
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195 | if(abac_term_is_numeric(ptr)) { |
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196 | _preprocess_range_numeric_constraint(ptr); |
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197 | } else if (abac_term_is_alpha(ptr)) { |
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198 | _preprocess_range_string_constraint(ptr); |
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199 | } else if (abac_term_is_time(ptr)) { |
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200 | _preprocess_range_time_constraint(ptr); |
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201 | } |
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202 | } else { |
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203 | /* special handling of role/oset constraining condition */ |
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204 | if(debug) fprintf(stderr,"expecting either oset/role constraint with %s\n",name); |
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205 | abac_aspect_t *cptr=abac_condition_of_aspect(cond); |
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206 | preprocess_pl_head(ctxt,cptr); |
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207 | |
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208 | /* generate the prolog clause */ |
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209 | char *tmp=generate_pl_constraint_clause(ctxt,cptr,name); |
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210 | abac_condition_set_aspect_string(cond,tmp); |
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211 | abac_pl_add_constraints(tmp); |
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212 | } |
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213 | } |
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214 | } |
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215 | |
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216 | void preprocess_pl_params(abac_context_t *ctxt,abac_param_list_t *ptr) |
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217 | { |
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218 | abac_list_t *list=abac_param_list(ptr); |
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219 | assert(list); |
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220 | abac_term_t *cur; |
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221 | abac_list_foreach(list, cur, |
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222 | preprocess_pl_term(ctxt,cur); |
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223 | ); |
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224 | } |
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225 | |
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226 | void preprocess_pl_head(abac_context_t *ctxt,abac_aspect_t *ptr) |
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227 | { |
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228 | char *principalname; |
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229 | PROLOG(principalname=abac_aspect_principal_name(ptr);); |
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230 | int idtype=abac_aspect_get_issuer_idtype(ptr); |
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231 | abac_pl_add_id_certs(principalname,idtype); |
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232 | if(debug) |
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233 | fprintf(stderr,"preprocess_pl_head: adding %s to id_certs\n",principalname); |
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234 | |
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235 | abac_param_list_t *aspect_params=abac_aspect_aspect_params(ptr); |
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236 | if(aspect_params) { |
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237 | preprocess_pl_params(ctxt,aspect_params); |
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238 | } |
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239 | abac_param_list_t *linked_role_params=abac_aspect_linked_role_params(ptr); |
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240 | if(linked_role_params) { |
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241 | preprocess_pl_params(ctxt,linked_role_params); |
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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 | void preprocess_pl_tail(abac_context_t *ctxt,abac_aspect_t *ptr) |
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247 | { |
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248 | /* if it is an intersection, preprocess each one */ |
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249 | |
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250 | abac_list_t *list=abac_aspect_prereqs(ptr); |
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251 | if(list != 0) { |
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252 | abac_aspect_t *cur; |
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253 | abac_list_foreach(list, cur, |
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254 | if(cur) |
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255 | preprocess_pl_tail(ctxt,cur); |
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256 | ); |
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257 | return; |
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258 | } |
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259 | |
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260 | /* for oset case, |
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261 | A.oset <- B |
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262 | A.oset <- Obj |
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263 | A.oset <- B.oset |
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264 | A.oset <- B.role.oset |
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265 | */ |
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266 | /* if it is an oset and object */ |
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267 | if(abac_aspect_is_object(ptr)) { |
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268 | abac_term_t *tptr=abac_aspect_object_term(ptr); |
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269 | if(tptr) |
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270 | preprocess_pl_term(ctxt,tptr); |
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271 | } else { |
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272 | char *principalname; |
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273 | PROLOG(principalname=abac_aspect_principal_name(ptr);); |
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274 | int idtype=abac_aspect_get_issuer_idtype(ptr); |
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275 | abac_pl_add_id_certs(principalname,idtype); |
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276 | if(debug) |
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277 | fprintf(stderr,"preprocess_pl_tail: adding %s to id_certs\n",principalname); |
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278 | abac_param_list_t *aspect_params=abac_aspect_aspect_params(ptr); |
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279 | if(aspect_params) { |
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280 | preprocess_pl_params(ctxt,aspect_params); |
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281 | } |
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282 | |
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283 | abac_param_list_t *linked_role_params=abac_aspect_linked_role_params(ptr); |
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284 | if(linked_role_params) { |
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285 | preprocess_pl_params(ctxt,linked_role_params); |
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286 | } |
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287 | } |
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288 | } |
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289 | |
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290 | |
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291 | |
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